56
57#include "namespace.h"
58#include <sys/types.h>
59#include <sys/param.h>
60#include <sys/socket.h>
61#include <net/if.h>
62#include <netinet/in.h>
63#include <net/if_types.h>
64#include <ifaddrs.h>
65#include <sys/queue.h>
66#ifdef INET6
67#include <sys/sysctl.h>
68#include <sys/ioctl.h>
69#include <netinet6/in6_var.h>
70#include <netinet6/nd6.h>
71#endif
72#include <arpa/inet.h>
73#include <arpa/nameser.h>
74#include <rpc/rpc.h>
75#include <rpcsvc/yp_prot.h>
76#include <rpcsvc/ypclnt.h>
77#include <netdb.h>
78#include <resolv.h>
79#include <string.h>
80#include <stdlib.h>
81#include <stddef.h>
82#include <ctype.h>
83#include <unistd.h>
84#include <stdio.h>
85#include <errno.h>
86
87#include "res_config.h"
88
89#ifdef DEBUG
90#include <syslog.h>
91#endif
92
93#include <stdarg.h>
94#include <nsswitch.h>
95#include "un-namespace.h"
96#include "netdb_private.h"
97#include "libc_private.h"
98#ifdef NS_CACHING
99#include "nscache.h"
100#endif
101
102#define ANY 0
103#define YES 1
104#define NO 0
105
106static const char in_addrany[] = { 0, 0, 0, 0 };
107static const char in_loopback[] = { 127, 0, 0, 1 };
108#ifdef INET6
109static const char in6_addrany[] = {
110 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
111};
112static const char in6_loopback[] = {
113 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
114};
115#endif
116
117struct policyqueue {
118 TAILQ_ENTRY(policyqueue) pc_entry;
119#ifdef INET6
120 struct in6_addrpolicy pc_policy;
121#endif
122};
123TAILQ_HEAD(policyhead, policyqueue);
124
125static const struct afd {
126 int a_af;
127 int a_addrlen;
128 socklen_t a_socklen;
129 int a_off;
130 const char *a_addrany;
131 const char *a_loopback;
132 int a_scoped;
133} afdl [] = {
134#ifdef INET6
135#define N_INET6 0
136 {PF_INET6, sizeof(struct in6_addr),
137 sizeof(struct sockaddr_in6),
138 offsetof(struct sockaddr_in6, sin6_addr),
139 in6_addrany, in6_loopback, 1},
140#define N_INET 1
141#define N_LOCAL 2
142#else
143#define N_INET 0
144#define N_LOCAL 1
145#endif
146 {PF_INET, sizeof(struct in_addr),
147 sizeof(struct sockaddr_in),
148 offsetof(struct sockaddr_in, sin_addr),
149 in_addrany, in_loopback, 0},
150#define sizeofmember(type, member) (sizeof(((type *)0)->member))
151 {PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path),
152 sizeof(struct sockaddr_un),
153 offsetof(struct sockaddr_un, sun_path),
154 NULL, NULL, 0},
155 {0, 0, 0, 0, NULL, NULL, 0},
156};
157
158struct explore {
159 int e_af;
160 int e_socktype;
161 int e_protocol;
162 int e_wild;
163#define AF_ANY 0x01
164#define SOCKTYPE_ANY 0x02
165#define PROTOCOL_ANY 0x04
166#define WILD_AF(ex) ((ex)->e_wild & AF_ANY)
167#define WILD_SOCKTYPE(ex) ((ex)->e_wild & SOCKTYPE_ANY)
168#define WILD_PROTOCOL(ex) ((ex)->e_wild & PROTOCOL_ANY)
169};
170
171static const struct explore explore[] = {
172#ifdef INET6
173 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP,
174 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
175 { PF_INET6, SOCK_STREAM, IPPROTO_TCP,
176 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
177 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP,
178 AF_ANY | SOCKTYPE_ANY },
179 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP,
180 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
181 { PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE,
182 AF_ANY | SOCKTYPE_ANY },
183 { PF_INET6, SOCK_RAW, ANY,
184 AF_ANY | PROTOCOL_ANY },
185#endif
186 { PF_INET, SOCK_DGRAM, IPPROTO_UDP,
187 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
188 { PF_INET, SOCK_STREAM, IPPROTO_TCP,
189 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
190 { PF_INET, SOCK_STREAM, IPPROTO_SCTP,
191 AF_ANY | SOCKTYPE_ANY },
192 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP,
193 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
194 { PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE,
195 AF_ANY | SOCKTYPE_ANY },
196 { PF_INET, SOCK_RAW, ANY,
197 AF_ANY | PROTOCOL_ANY },
198 { PF_LOCAL, SOCK_DGRAM, ANY,
199 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
200 { PF_LOCAL, SOCK_STREAM, ANY,
201 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
202 { PF_LOCAL, SOCK_SEQPACKET, ANY,
203 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
204 { -1, 0, 0, 0 },
205};
206
207#ifdef INET6
208#define PTON_MAX 16
209#else
210#define PTON_MAX 4
211#endif
212
213#define AIO_SRCFLAG_DEPRECATED 0x1
214
215struct ai_order {
216 union {
217 struct sockaddr_storage aiou_ss;
218 struct sockaddr aiou_sa;
219 } aio_src_un;
220#define aio_srcsa aio_src_un.aiou_sa
221 u_int32_t aio_srcflag;
222 int aio_srcscope;
223 int aio_dstscope;
224 struct policyqueue *aio_srcpolicy;
225 struct policyqueue *aio_dstpolicy;
226 struct addrinfo *aio_ai;
227 int aio_matchlen;
228};
229
230static const ns_src default_dns_files[] = {
231 { NSSRC_FILES, NS_SUCCESS },
232 { NSSRC_DNS, NS_SUCCESS },
233 { 0 }
234};
235
236struct res_target {
237 struct res_target *next;
238 const char *name; /* domain name */
239 int qclass, qtype; /* class and type of query */
240 u_char *answer; /* buffer to put answer */
241 int anslen; /* size of answer buffer */
242 int n; /* result length */
243};
244
245#define MAXPACKET (64*1024)
246
247typedef union {
248 HEADER hdr;
249 u_char buf[MAXPACKET];
250} querybuf;
251
252static int str2number(const char *, int *);
253static int explore_copy(const struct addrinfo *, const struct addrinfo *,
254 struct addrinfo **);
255static int explore_null(const struct addrinfo *,
256 const char *, struct addrinfo **);
257static int explore_numeric(const struct addrinfo *, const char *,
258 const char *, struct addrinfo **, const char *);
259static int explore_numeric_scope(const struct addrinfo *, const char *,
260 const char *, struct addrinfo **);
261static int get_canonname(const struct addrinfo *,
262 struct addrinfo *, const char *);
263static struct addrinfo *get_ai(const struct addrinfo *,
264 const struct afd *, const char *);
265static struct addrinfo *copy_ai(const struct addrinfo *);
266static int get_portmatch(const struct addrinfo *, const char *);
267static int get_port(struct addrinfo *, const char *, int);
268static const struct afd *find_afd(int);
269static int addrconfig(struct addrinfo *);
270#ifdef INET6
271static int is_ifdisabled(char *);
272#endif
273static void set_source(struct ai_order *, struct policyhead *);
274static int comp_dst(const void *, const void *);
275#ifdef INET6
276static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
277#endif
278static int gai_addr2scopetype(struct sockaddr *);
279
280static int explore_fqdn(const struct addrinfo *, const char *,
281 const char *, struct addrinfo **);
282
283static int reorder(struct addrinfo *);
284static int get_addrselectpolicy(struct policyhead *);
285static void free_addrselectpolicy(struct policyhead *);
286static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
287 struct policyhead *);
288static int matchlen(struct sockaddr *, struct sockaddr *);
289
290static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
291 const struct addrinfo *, res_state);
292#if defined(RESOLVSORT)
293static int addr4sort(struct addrinfo *, res_state);
294#endif
295static int _dns_getaddrinfo(void *, void *, va_list);
296static void _sethtent(FILE **);
297static void _endhtent(FILE **);
298static struct addrinfo *_gethtent(FILE **, const char *,
299 const struct addrinfo *);
300static int _files_getaddrinfo(void *, void *, va_list);
301#ifdef YP
302static struct addrinfo *_yphostent(char *, const struct addrinfo *);
303static int _yp_getaddrinfo(void *, void *, va_list);
304#endif
305#ifdef NS_CACHING
306static int addrinfo_id_func(char *, size_t *, va_list, void *);
307static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
308static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
309#endif
310
311static int res_queryN(const char *, struct res_target *, res_state);
312static int res_searchN(const char *, struct res_target *, res_state);
313static int res_querydomainN(const char *, const char *,
314 struct res_target *, res_state);
315
316/* XXX macros that make external reference is BAD. */
317
318#define GET_AI(ai, afd, addr) \
319do { \
320 /* external reference: pai, error, and label free */ \
321 (ai) = get_ai(pai, (afd), (addr)); \
322 if ((ai) == NULL) { \
323 error = EAI_MEMORY; \
324 goto free; \
325 } \
326} while (/*CONSTCOND*/0)
327
328#define GET_PORT(ai, serv) \
329do { \
330 /* external reference: error and label free */ \
331 error = get_port((ai), (serv), 0); \
332 if (error != 0) \
333 goto free; \
334} while (/*CONSTCOND*/0)
335
336#define GET_CANONNAME(ai, str) \
337do { \
338 /* external reference: pai, error and label free */ \
339 error = get_canonname(pai, (ai), (str)); \
340 if (error != 0) \
341 goto free; \
342} while (/*CONSTCOND*/0)
343
344#define ERR(err) \
345do { \
346 /* external reference: error, and label bad */ \
347 error = (err); \
348 goto bad; \
349 /*NOTREACHED*/ \
350} while (/*CONSTCOND*/0)
351
352#define MATCH_FAMILY(x, y, w) \
353 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
354#define MATCH(x, y, w) \
355 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
356
357void
358freeaddrinfo(struct addrinfo *ai)
359{
360 struct addrinfo *next;
361
362 do {
363 next = ai->ai_next;
364 if (ai->ai_canonname)
365 free(ai->ai_canonname);
366 /* no need to free(ai->ai_addr) */
367 free(ai);
368 ai = next;
369 } while (ai);
370}
371
372static int
373str2number(const char *p, int *portp)
374{
375 char *ep;
376 unsigned long v;
377
378 if (*p == '\0')
379 return -1;
380 ep = NULL;
381 errno = 0;
382 v = strtoul(p, &ep, 10);
383 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
384 *portp = v;
385 return 0;
386 } else
387 return -1;
388}
389
390int
391getaddrinfo(const char *hostname, const char *servname,
392 const struct addrinfo *hints, struct addrinfo **res)
393{
394 struct addrinfo sentinel;
395 struct addrinfo *cur;
396 int error = 0;
397 struct addrinfo ai, ai0, *afai;
398 struct addrinfo *pai;
399 const struct afd *afd;
400 const struct explore *ex;
| 56
57#include "namespace.h"
58#include <sys/types.h>
59#include <sys/param.h>
60#include <sys/socket.h>
61#include <net/if.h>
62#include <netinet/in.h>
63#include <net/if_types.h>
64#include <ifaddrs.h>
65#include <sys/queue.h>
66#ifdef INET6
67#include <sys/sysctl.h>
68#include <sys/ioctl.h>
69#include <netinet6/in6_var.h>
70#include <netinet6/nd6.h>
71#endif
72#include <arpa/inet.h>
73#include <arpa/nameser.h>
74#include <rpc/rpc.h>
75#include <rpcsvc/yp_prot.h>
76#include <rpcsvc/ypclnt.h>
77#include <netdb.h>
78#include <resolv.h>
79#include <string.h>
80#include <stdlib.h>
81#include <stddef.h>
82#include <ctype.h>
83#include <unistd.h>
84#include <stdio.h>
85#include <errno.h>
86
87#include "res_config.h"
88
89#ifdef DEBUG
90#include <syslog.h>
91#endif
92
93#include <stdarg.h>
94#include <nsswitch.h>
95#include "un-namespace.h"
96#include "netdb_private.h"
97#include "libc_private.h"
98#ifdef NS_CACHING
99#include "nscache.h"
100#endif
101
102#define ANY 0
103#define YES 1
104#define NO 0
105
106static const char in_addrany[] = { 0, 0, 0, 0 };
107static const char in_loopback[] = { 127, 0, 0, 1 };
108#ifdef INET6
109static const char in6_addrany[] = {
110 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
111};
112static const char in6_loopback[] = {
113 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
114};
115#endif
116
117struct policyqueue {
118 TAILQ_ENTRY(policyqueue) pc_entry;
119#ifdef INET6
120 struct in6_addrpolicy pc_policy;
121#endif
122};
123TAILQ_HEAD(policyhead, policyqueue);
124
125static const struct afd {
126 int a_af;
127 int a_addrlen;
128 socklen_t a_socklen;
129 int a_off;
130 const char *a_addrany;
131 const char *a_loopback;
132 int a_scoped;
133} afdl [] = {
134#ifdef INET6
135#define N_INET6 0
136 {PF_INET6, sizeof(struct in6_addr),
137 sizeof(struct sockaddr_in6),
138 offsetof(struct sockaddr_in6, sin6_addr),
139 in6_addrany, in6_loopback, 1},
140#define N_INET 1
141#define N_LOCAL 2
142#else
143#define N_INET 0
144#define N_LOCAL 1
145#endif
146 {PF_INET, sizeof(struct in_addr),
147 sizeof(struct sockaddr_in),
148 offsetof(struct sockaddr_in, sin_addr),
149 in_addrany, in_loopback, 0},
150#define sizeofmember(type, member) (sizeof(((type *)0)->member))
151 {PF_LOCAL, sizeofmember(struct sockaddr_un, sun_path),
152 sizeof(struct sockaddr_un),
153 offsetof(struct sockaddr_un, sun_path),
154 NULL, NULL, 0},
155 {0, 0, 0, 0, NULL, NULL, 0},
156};
157
158struct explore {
159 int e_af;
160 int e_socktype;
161 int e_protocol;
162 int e_wild;
163#define AF_ANY 0x01
164#define SOCKTYPE_ANY 0x02
165#define PROTOCOL_ANY 0x04
166#define WILD_AF(ex) ((ex)->e_wild & AF_ANY)
167#define WILD_SOCKTYPE(ex) ((ex)->e_wild & SOCKTYPE_ANY)
168#define WILD_PROTOCOL(ex) ((ex)->e_wild & PROTOCOL_ANY)
169};
170
171static const struct explore explore[] = {
172#ifdef INET6
173 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP,
174 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
175 { PF_INET6, SOCK_STREAM, IPPROTO_TCP,
176 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
177 { PF_INET6, SOCK_STREAM, IPPROTO_SCTP,
178 AF_ANY | SOCKTYPE_ANY },
179 { PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP,
180 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
181 { PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE,
182 AF_ANY | SOCKTYPE_ANY },
183 { PF_INET6, SOCK_RAW, ANY,
184 AF_ANY | PROTOCOL_ANY },
185#endif
186 { PF_INET, SOCK_DGRAM, IPPROTO_UDP,
187 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
188 { PF_INET, SOCK_STREAM, IPPROTO_TCP,
189 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
190 { PF_INET, SOCK_STREAM, IPPROTO_SCTP,
191 AF_ANY | SOCKTYPE_ANY },
192 { PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP,
193 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
194 { PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE,
195 AF_ANY | SOCKTYPE_ANY },
196 { PF_INET, SOCK_RAW, ANY,
197 AF_ANY | PROTOCOL_ANY },
198 { PF_LOCAL, SOCK_DGRAM, ANY,
199 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
200 { PF_LOCAL, SOCK_STREAM, ANY,
201 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
202 { PF_LOCAL, SOCK_SEQPACKET, ANY,
203 AF_ANY | SOCKTYPE_ANY | PROTOCOL_ANY },
204 { -1, 0, 0, 0 },
205};
206
207#ifdef INET6
208#define PTON_MAX 16
209#else
210#define PTON_MAX 4
211#endif
212
213#define AIO_SRCFLAG_DEPRECATED 0x1
214
215struct ai_order {
216 union {
217 struct sockaddr_storage aiou_ss;
218 struct sockaddr aiou_sa;
219 } aio_src_un;
220#define aio_srcsa aio_src_un.aiou_sa
221 u_int32_t aio_srcflag;
222 int aio_srcscope;
223 int aio_dstscope;
224 struct policyqueue *aio_srcpolicy;
225 struct policyqueue *aio_dstpolicy;
226 struct addrinfo *aio_ai;
227 int aio_matchlen;
228};
229
230static const ns_src default_dns_files[] = {
231 { NSSRC_FILES, NS_SUCCESS },
232 { NSSRC_DNS, NS_SUCCESS },
233 { 0 }
234};
235
236struct res_target {
237 struct res_target *next;
238 const char *name; /* domain name */
239 int qclass, qtype; /* class and type of query */
240 u_char *answer; /* buffer to put answer */
241 int anslen; /* size of answer buffer */
242 int n; /* result length */
243};
244
245#define MAXPACKET (64*1024)
246
247typedef union {
248 HEADER hdr;
249 u_char buf[MAXPACKET];
250} querybuf;
251
252static int str2number(const char *, int *);
253static int explore_copy(const struct addrinfo *, const struct addrinfo *,
254 struct addrinfo **);
255static int explore_null(const struct addrinfo *,
256 const char *, struct addrinfo **);
257static int explore_numeric(const struct addrinfo *, const char *,
258 const char *, struct addrinfo **, const char *);
259static int explore_numeric_scope(const struct addrinfo *, const char *,
260 const char *, struct addrinfo **);
261static int get_canonname(const struct addrinfo *,
262 struct addrinfo *, const char *);
263static struct addrinfo *get_ai(const struct addrinfo *,
264 const struct afd *, const char *);
265static struct addrinfo *copy_ai(const struct addrinfo *);
266static int get_portmatch(const struct addrinfo *, const char *);
267static int get_port(struct addrinfo *, const char *, int);
268static const struct afd *find_afd(int);
269static int addrconfig(struct addrinfo *);
270#ifdef INET6
271static int is_ifdisabled(char *);
272#endif
273static void set_source(struct ai_order *, struct policyhead *);
274static int comp_dst(const void *, const void *);
275#ifdef INET6
276static int ip6_str2scopeid(char *, struct sockaddr_in6 *, u_int32_t *);
277#endif
278static int gai_addr2scopetype(struct sockaddr *);
279
280static int explore_fqdn(const struct addrinfo *, const char *,
281 const char *, struct addrinfo **);
282
283static int reorder(struct addrinfo *);
284static int get_addrselectpolicy(struct policyhead *);
285static void free_addrselectpolicy(struct policyhead *);
286static struct policyqueue *match_addrselectpolicy(struct sockaddr *,
287 struct policyhead *);
288static int matchlen(struct sockaddr *, struct sockaddr *);
289
290static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
291 const struct addrinfo *, res_state);
292#if defined(RESOLVSORT)
293static int addr4sort(struct addrinfo *, res_state);
294#endif
295static int _dns_getaddrinfo(void *, void *, va_list);
296static void _sethtent(FILE **);
297static void _endhtent(FILE **);
298static struct addrinfo *_gethtent(FILE **, const char *,
299 const struct addrinfo *);
300static int _files_getaddrinfo(void *, void *, va_list);
301#ifdef YP
302static struct addrinfo *_yphostent(char *, const struct addrinfo *);
303static int _yp_getaddrinfo(void *, void *, va_list);
304#endif
305#ifdef NS_CACHING
306static int addrinfo_id_func(char *, size_t *, va_list, void *);
307static int addrinfo_marshal_func(char *, size_t *, void *, va_list, void *);
308static int addrinfo_unmarshal_func(char *, size_t, void *, va_list, void *);
309#endif
310
311static int res_queryN(const char *, struct res_target *, res_state);
312static int res_searchN(const char *, struct res_target *, res_state);
313static int res_querydomainN(const char *, const char *,
314 struct res_target *, res_state);
315
316/* XXX macros that make external reference is BAD. */
317
318#define GET_AI(ai, afd, addr) \
319do { \
320 /* external reference: pai, error, and label free */ \
321 (ai) = get_ai(pai, (afd), (addr)); \
322 if ((ai) == NULL) { \
323 error = EAI_MEMORY; \
324 goto free; \
325 } \
326} while (/*CONSTCOND*/0)
327
328#define GET_PORT(ai, serv) \
329do { \
330 /* external reference: error and label free */ \
331 error = get_port((ai), (serv), 0); \
332 if (error != 0) \
333 goto free; \
334} while (/*CONSTCOND*/0)
335
336#define GET_CANONNAME(ai, str) \
337do { \
338 /* external reference: pai, error and label free */ \
339 error = get_canonname(pai, (ai), (str)); \
340 if (error != 0) \
341 goto free; \
342} while (/*CONSTCOND*/0)
343
344#define ERR(err) \
345do { \
346 /* external reference: error, and label bad */ \
347 error = (err); \
348 goto bad; \
349 /*NOTREACHED*/ \
350} while (/*CONSTCOND*/0)
351
352#define MATCH_FAMILY(x, y, w) \
353 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC)))
354#define MATCH(x, y, w) \
355 ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY)))
356
357void
358freeaddrinfo(struct addrinfo *ai)
359{
360 struct addrinfo *next;
361
362 do {
363 next = ai->ai_next;
364 if (ai->ai_canonname)
365 free(ai->ai_canonname);
366 /* no need to free(ai->ai_addr) */
367 free(ai);
368 ai = next;
369 } while (ai);
370}
371
372static int
373str2number(const char *p, int *portp)
374{
375 char *ep;
376 unsigned long v;
377
378 if (*p == '\0')
379 return -1;
380 ep = NULL;
381 errno = 0;
382 v = strtoul(p, &ep, 10);
383 if (errno == 0 && ep && *ep == '\0' && v <= UINT_MAX) {
384 *portp = v;
385 return 0;
386 } else
387 return -1;
388}
389
390int
391getaddrinfo(const char *hostname, const char *servname,
392 const struct addrinfo *hints, struct addrinfo **res)
393{
394 struct addrinfo sentinel;
395 struct addrinfo *cur;
396 int error = 0;
397 struct addrinfo ai, ai0, *afai;
398 struct addrinfo *pai;
399 const struct afd *afd;
400 const struct explore *ex;
|
746 free(buf);
747 return (0);
748 }
749
750 ep = (struct in6_addrpolicy *)(buf + l);
751 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
752 struct policyqueue *new;
753
754 if ((new = malloc(sizeof(*new))) == NULL) {
755 free_addrselectpolicy(head); /* make the list empty */
756 break;
757 }
758 new->pc_policy = *pol;
759 TAILQ_INSERT_TAIL(head, new, pc_entry);
760 }
761
762 free(buf);
763 return (1);
764#else
765 return (0);
766#endif
767}
768
769static void
770free_addrselectpolicy(struct policyhead *head)
771{
772 struct policyqueue *ent, *nent;
773
774 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
775 nent = TAILQ_NEXT(ent, pc_entry);
776 TAILQ_REMOVE(head, ent, pc_entry);
777 free(ent);
778 }
779}
780
781static struct policyqueue *
782match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
783{
784#ifdef INET6
785 struct policyqueue *ent, *bestent = NULL;
786 struct in6_addrpolicy *pol;
787 int matchlen, bestmatchlen = -1;
788 u_char *mp, *ep, *k, *p, m;
789 struct sockaddr_in6 key;
790
791 switch(addr->sa_family) {
792 case AF_INET6:
793 key = *(struct sockaddr_in6 *)addr;
794 break;
795 case AF_INET:
796 /* convert the address into IPv4-mapped IPv6 address. */
797 memset(&key, 0, sizeof(key));
798 key.sin6_family = AF_INET6;
799 key.sin6_len = sizeof(key);
800 _map_v4v6_address(
801 (char *)&((struct sockaddr_in *)addr)->sin_addr,
802 (char *)&key.sin6_addr);
803 break;
804 default:
805 return(NULL);
806 }
807
808 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
809 pol = &ent->pc_policy;
810 matchlen = 0;
811
812 mp = (u_char *)&pol->addrmask.sin6_addr;
813 ep = mp + 16; /* XXX: scope field? */
814 k = (u_char *)&key.sin6_addr;
815 p = (u_char *)&pol->addr.sin6_addr;
816 for (; mp < ep && *mp; mp++, k++, p++) {
817 m = *mp;
818 if ((*k & m) != *p)
819 goto next; /* not match */
820 if (m == 0xff) /* short cut for a typical case */
821 matchlen += 8;
822 else {
823 while (m >= 0x80) {
824 matchlen++;
825 m <<= 1;
826 }
827 }
828 }
829
830 /* matched. check if this is better than the current best. */
831 if (matchlen > bestmatchlen) {
832 bestent = ent;
833 bestmatchlen = matchlen;
834 }
835
836 next:
837 continue;
838 }
839
840 return(bestent);
841#else
842 return(NULL);
843#endif
844
845}
846
847static void
848set_source(struct ai_order *aio, struct policyhead *ph)
849{
850 struct addrinfo ai = *aio->aio_ai;
851 struct sockaddr_storage ss;
852 socklen_t srclen;
853 int s;
854
855 /* set unspec ("no source is available"), just in case */
856 aio->aio_srcsa.sa_family = AF_UNSPEC;
857 aio->aio_srcscope = -1;
858
859 switch(ai.ai_family) {
860 case AF_INET:
861#ifdef INET6
862 case AF_INET6:
863#endif
864 break;
865 default: /* ignore unsupported AFs explicitly */
866 return;
867 }
868
869 /* XXX: make a dummy addrinfo to call connect() */
870 ai.ai_socktype = SOCK_DGRAM;
871 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
872 ai.ai_next = NULL;
873 memset(&ss, 0, sizeof(ss));
874 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
875 ai.ai_addr = (struct sockaddr *)&ss;
876 get_port(&ai, "1", 0);
877
878 /* open a socket to get the source address for the given dst */
879 if ((s = _socket(ai.ai_family, ai.ai_socktype | SOCK_CLOEXEC,
880 ai.ai_protocol)) < 0)
881 return; /* give up */
882#ifdef INET6
883 if (ai.ai_family == AF_INET6) {
884 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai.ai_addr;
885 int off = 0;
886
887 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
888 (void)_setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
889 (char *)&off, sizeof(off));
890 }
891#endif
892 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
893 goto cleanup;
894 srclen = ai.ai_addrlen;
895 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
896 aio->aio_srcsa.sa_family = AF_UNSPEC;
897 goto cleanup;
898 }
899 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
900 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
901 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
902#ifdef INET6
903 if (ai.ai_family == AF_INET6) {
904 struct in6_ifreq ifr6;
905 u_int32_t flags6;
906
907 memset(&ifr6, 0, sizeof(ifr6));
908 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
909 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
910 flags6 = ifr6.ifr_ifru.ifru_flags6;
911 if ((flags6 & IN6_IFF_DEPRECATED))
912 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
913 }
914 }
915#endif
916
917 cleanup:
918 _close(s);
919 return;
920}
921
922static int
923matchlen(struct sockaddr *src, struct sockaddr *dst)
924{
925 int match = 0;
926 u_char *s, *d;
927 u_char *lim, r;
928 int addrlen;
929
930 switch (src->sa_family) {
931#ifdef INET6
932 case AF_INET6:
933 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
934 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
935 addrlen = sizeof(struct in6_addr);
936 lim = s + addrlen;
937 break;
938#endif
939 case AF_INET:
940 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
941 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
942 addrlen = sizeof(struct in_addr);
943 lim = s + addrlen;
944 break;
945 default:
946 return(0);
947 }
948
949 while (s < lim)
950 if ((r = (*d++ ^ *s++)) != 0) {
951 while (r < addrlen * 8) {
952 match++;
953 r <<= 1;
954 }
955 break;
956 } else
957 match += 8;
958 return(match);
959}
960
961static int
962comp_dst(const void *arg1, const void *arg2)
963{
964 const struct ai_order *dst1 = arg1, *dst2 = arg2;
965
966 /*
967 * Rule 1: Avoid unusable destinations.
968 * XXX: we currently do not consider if an appropriate route exists.
969 */
970 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
971 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
972 return(-1);
973 }
974 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
975 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
976 return(1);
977 }
978
979 /* Rule 2: Prefer matching scope. */
980 if (dst1->aio_dstscope == dst1->aio_srcscope &&
981 dst2->aio_dstscope != dst2->aio_srcscope) {
982 return(-1);
983 }
984 if (dst1->aio_dstscope != dst1->aio_srcscope &&
985 dst2->aio_dstscope == dst2->aio_srcscope) {
986 return(1);
987 }
988
989 /* Rule 3: Avoid deprecated addresses. */
990 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
991 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
992 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
993 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
994 return(-1);
995 }
996 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
997 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
998 return(1);
999 }
1000 }
1001
1002 /* Rule 4: Prefer home addresses. */
1003 /* XXX: not implemented yet */
1004
1005 /* Rule 5: Prefer matching label. */
1006#ifdef INET6
1007 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
1008 dst1->aio_srcpolicy->pc_policy.label ==
1009 dst1->aio_dstpolicy->pc_policy.label &&
1010 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
1011 dst2->aio_srcpolicy->pc_policy.label !=
1012 dst2->aio_dstpolicy->pc_policy.label)) {
1013 return(-1);
1014 }
1015 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
1016 dst2->aio_srcpolicy->pc_policy.label ==
1017 dst2->aio_dstpolicy->pc_policy.label &&
1018 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
1019 dst1->aio_srcpolicy->pc_policy.label !=
1020 dst1->aio_dstpolicy->pc_policy.label)) {
1021 return(1);
1022 }
1023#endif
1024
1025 /* Rule 6: Prefer higher precedence. */
1026#ifdef INET6
1027 if (dst1->aio_dstpolicy &&
1028 (dst2->aio_dstpolicy == NULL ||
1029 dst1->aio_dstpolicy->pc_policy.preced >
1030 dst2->aio_dstpolicy->pc_policy.preced)) {
1031 return(-1);
1032 }
1033 if (dst2->aio_dstpolicy &&
1034 (dst1->aio_dstpolicy == NULL ||
1035 dst2->aio_dstpolicy->pc_policy.preced >
1036 dst1->aio_dstpolicy->pc_policy.preced)) {
1037 return(1);
1038 }
1039#endif
1040
1041 /* Rule 7: Prefer native transport. */
1042 /* XXX: not implemented yet */
1043
1044 /* Rule 8: Prefer smaller scope. */
1045 if (dst1->aio_dstscope >= 0 &&
1046 dst1->aio_dstscope < dst2->aio_dstscope) {
1047 return(-1);
1048 }
1049 if (dst2->aio_dstscope >= 0 &&
1050 dst2->aio_dstscope < dst1->aio_dstscope) {
1051 return(1);
1052 }
1053
1054 /*
1055 * Rule 9: Use longest matching prefix.
1056 * We compare the match length in a same AF only.
1057 */
1058 if (dst1->aio_ai->ai_addr->sa_family ==
1059 dst2->aio_ai->ai_addr->sa_family &&
1060 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1061 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1062 return(-1);
1063 }
1064 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1065 return(1);
1066 }
1067 }
1068
1069 /* Rule 10: Otherwise, leave the order unchanged. */
1070 return(-1);
1071}
1072
1073/*
1074 * Copy from scope.c.
1075 * XXX: we should standardize the functions and link them as standard
1076 * library.
1077 */
1078static int
1079gai_addr2scopetype(struct sockaddr *sa)
1080{
1081#ifdef INET6
1082 struct sockaddr_in6 *sa6;
1083#endif
1084 struct sockaddr_in *sa4;
1085
1086 switch(sa->sa_family) {
1087#ifdef INET6
1088 case AF_INET6:
1089 sa6 = (struct sockaddr_in6 *)sa;
1090 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1091 /* just use the scope field of the multicast address */
1092 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1093 }
1094 /*
1095 * Unicast addresses: map scope type to corresponding scope
1096 * value defined for multcast addresses.
1097 * XXX: hardcoded scope type values are bad...
1098 */
1099 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1100 return(1); /* node local scope */
1101 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1102 return(2); /* link-local scope */
1103 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1104 return(5); /* site-local scope */
1105 return(14); /* global scope */
1106 break;
1107#endif
1108 case AF_INET:
1109 /*
1110 * IPv4 pseudo scoping according to RFC 3484.
1111 */
1112 sa4 = (struct sockaddr_in *)sa;
1113 /* IPv4 autoconfiguration addresses have link-local scope. */
1114 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1115 ((u_char *)&sa4->sin_addr)[1] == 254)
1116 return(2);
1117 /* Private addresses have site-local scope. */
1118 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1119 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1120 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1121 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1122 ((u_char *)&sa4->sin_addr)[1] == 168))
1123 return(14); /* XXX: It should be 5 unless NAT */
1124 /* Loopback addresses have link-local scope. */
1125 if (((u_char *)&sa4->sin_addr)[0] == 127)
1126 return(2);
1127 return(14);
1128 break;
1129 default:
1130 errno = EAFNOSUPPORT; /* is this a good error? */
1131 return(-1);
1132 }
1133}
1134
1135static int
1136explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1137 struct addrinfo **res)
1138{
1139 int error;
1140 struct addrinfo sentinel, *cur;
1141 const struct addrinfo *src;
1142
1143 error = 0;
1144 sentinel.ai_next = NULL;
1145 cur = &sentinel;
1146
1147 for (src = src0; src != NULL; src = src->ai_next) {
1148 if (src->ai_family != pai->ai_family)
1149 continue;
1150
1151 cur->ai_next = copy_ai(src);
1152 if (!cur->ai_next) {
1153 error = EAI_MEMORY;
1154 goto fail;
1155 }
1156
1157 cur->ai_next->ai_socktype = pai->ai_socktype;
1158 cur->ai_next->ai_protocol = pai->ai_protocol;
1159 cur = cur->ai_next;
1160 }
1161
1162 *res = sentinel.ai_next;
1163 return 0;
1164
1165fail:
1166 freeaddrinfo(sentinel.ai_next);
1167 return error;
1168}
1169
1170/*
1171 * hostname == NULL.
1172 * passive socket -> anyaddr (0.0.0.0 or ::)
1173 * non-passive socket -> localhost (127.0.0.1 or ::1)
1174 */
1175static int
1176explore_null(const struct addrinfo *pai, const char *servname,
1177 struct addrinfo **res)
1178{
1179 int s;
1180 const struct afd *afd;
1181 struct addrinfo *ai;
1182 int error;
1183
1184 *res = NULL;
1185 ai = NULL;
1186
1187 if (pai->ai_family == PF_LOCAL)
1188 return (0);
1189
1190 /*
1191 * filter out AFs that are not supported by the kernel
1192 * XXX errno?
1193 */
1194 s = _socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1195 if (s < 0) {
1196 if (errno != EMFILE)
1197 return 0;
1198 } else
1199 _close(s);
1200
1201 afd = find_afd(pai->ai_family);
1202 if (afd == NULL)
1203 return 0;
1204
1205 if (pai->ai_flags & AI_PASSIVE) {
1206 GET_AI(ai, afd, afd->a_addrany);
1207 GET_PORT(ai, servname);
1208 } else {
1209 GET_AI(ai, afd, afd->a_loopback);
1210 GET_PORT(ai, servname);
1211 }
1212
1213 *res = ai;
1214 return 0;
1215
1216free:
1217 if (ai != NULL)
1218 freeaddrinfo(ai);
1219 return error;
1220}
1221
1222/*
1223 * numeric hostname
1224 */
1225static int
1226explore_numeric(const struct addrinfo *pai, const char *hostname,
1227 const char *servname, struct addrinfo **res, const char *canonname)
1228{
1229 const struct afd *afd;
1230 struct addrinfo *ai, ai0;
1231 int error;
1232 char pton[PTON_MAX], path[PATH_MAX], *p;
1233
1234#ifdef CTASSERT
1235 CTASSERT(sizeofmember(struct sockaddr_un, sun_path) <= PATH_MAX);
1236#endif
1237 *res = NULL;
1238 ai = NULL;
1239
1240 afd = find_afd(pai->ai_family);
1241 if (afd == NULL)
1242 return 0;
1243
1244 switch (afd->a_af) {
1245 case AF_LOCAL:
1246 if (hostname[0] != '/')
1247 ERR(EAI_NONAME);
1248 if (strlen(hostname) > afd->a_addrlen)
1249 ERR(EAI_MEMORY);
1250 /* NUL-termination does not need to be guaranteed. */
1251 strncpy(path, hostname, afd->a_addrlen);
1252 p = &path[0];
1253 break;
1254 case AF_INET:
1255 /*
1256 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1257 * that are accepted by inet_addr() and its family. The
1258 * accepted forms includes the "classful" one, which inet_pton
1259 * does not accept. So we need to separate the case for
1260 * AF_INET.
1261 */
1262 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1263 return 0;
1264 p = pton;
1265 break;
1266 default:
1267 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1268 if (pai->ai_family != AF_INET6 ||
1269 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1270 return 0;
1271 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1272 return 0;
1273 afd = &afdl[N_INET];
1274 ai0 = *pai;
1275 ai0.ai_family = AF_INET;
1276 pai = &ai0;
1277 }
1278 p = pton;
1279 break;
1280 }
1281
1282 if (pai->ai_family == afd->a_af) {
1283 GET_AI(ai, afd, p);
1284 GET_PORT(ai, servname);
1285 if ((pai->ai_family == AF_INET ||
1286 pai->ai_family == AF_INET6) &&
1287 (pai->ai_flags & AI_CANONNAME)) {
1288 /*
1289 * Set the numeric address itself as the canonical
1290 * name, based on a clarification in RFC3493.
1291 */
1292 GET_CANONNAME(ai, canonname);
1293 }
1294 } else {
1295 /*
1296 * XXX: This should not happen since we already matched the AF
1297 * by find_afd.
1298 */
1299 ERR(EAI_FAMILY);
1300 }
1301
1302 *res = ai;
1303 return 0;
1304
1305free:
1306bad:
1307 if (ai != NULL)
1308 freeaddrinfo(ai);
1309 return error;
1310}
1311
1312/*
1313 * numeric hostname with scope
1314 */
1315static int
1316explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1317 const char *servname, struct addrinfo **res)
1318{
1319#if !defined(SCOPE_DELIMITER) || !defined(INET6)
1320 return explore_numeric(pai, hostname, servname, res, hostname);
1321#else
1322 const struct afd *afd;
1323 struct addrinfo *cur;
1324 int error;
1325 char *cp, *hostname2 = NULL, *scope, *addr;
1326 struct sockaddr_in6 *sin6;
1327
1328 afd = find_afd(pai->ai_family);
1329 if (afd == NULL)
1330 return 0;
1331
1332 if (!afd->a_scoped)
1333 return explore_numeric(pai, hostname, servname, res, hostname);
1334
1335 cp = strchr(hostname, SCOPE_DELIMITER);
1336 if (cp == NULL)
1337 return explore_numeric(pai, hostname, servname, res, hostname);
1338
1339 /*
1340 * Handle special case of <scoped_address><delimiter><scope id>
1341 */
1342 hostname2 = strdup(hostname);
1343 if (hostname2 == NULL)
1344 return EAI_MEMORY;
1345 /* terminate at the delimiter */
1346 hostname2[cp - hostname] = '\0';
1347 addr = hostname2;
1348 scope = cp + 1;
1349
1350 error = explore_numeric(pai, addr, servname, res, hostname);
1351 if (error == 0) {
1352 u_int32_t scopeid;
1353
1354 for (cur = *res; cur; cur = cur->ai_next) {
1355 if (cur->ai_family != AF_INET6)
1356 continue;
1357 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1358 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1359 free(hostname2);
1360 freeaddrinfo(*res);
1361 *res = NULL;
1362 return(EAI_NONAME); /* XXX: is return OK? */
1363 }
1364 sin6->sin6_scope_id = scopeid;
1365 }
1366 }
1367
1368 free(hostname2);
1369
1370 if (error && *res) {
1371 freeaddrinfo(*res);
1372 *res = NULL;
1373 }
1374 return error;
1375#endif
1376}
1377
1378static int
1379get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1380{
1381 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1382 ai->ai_canonname = strdup(str);
1383 if (ai->ai_canonname == NULL)
1384 return EAI_MEMORY;
1385 }
1386 return 0;
1387}
1388
1389static struct addrinfo *
1390get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1391{
1392 char *p;
1393 struct addrinfo *ai;
1394#ifdef INET6
1395 struct in6_addr mapaddr;
1396
1397 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1398 afd = &afdl[N_INET6];
1399 _map_v4v6_address(addr, (char *)&mapaddr);
1400 addr = (char *)&mapaddr;
1401 }
1402#endif
1403
1404 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1405 + (afd->a_socklen));
1406 if (ai == NULL)
1407 return NULL;
1408
1409 memcpy(ai, pai, sizeof(struct addrinfo));
1410 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1411 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1412 ai->ai_addr->sa_len = afd->a_socklen;
1413 ai->ai_addrlen = afd->a_socklen;
1414 if (ai->ai_family == PF_LOCAL) {
1415 size_t n = strnlen(addr, afd->a_addrlen);
1416
1417 ai->ai_addrlen -= afd->a_addrlen - n;
1418 ai->ai_addr->sa_len -= afd->a_addrlen - n;
1419 }
1420 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1421 p = (char *)(void *)(ai->ai_addr);
1422 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1423 return ai;
1424}
1425
1426/* XXX need to malloc() the same way we do from other functions! */
1427static struct addrinfo *
1428copy_ai(const struct addrinfo *pai)
1429{
1430 struct addrinfo *ai;
1431 size_t l;
1432
1433 l = sizeof(*ai) + pai->ai_addrlen;
1434 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
1435 return NULL;
1436 memset(ai, 0, l);
1437 memcpy(ai, pai, sizeof(*ai));
1438 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1439 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1440
1441 if (pai->ai_canonname) {
1442 l = strlen(pai->ai_canonname) + 1;
1443 if ((ai->ai_canonname = malloc(l)) == NULL) {
1444 free(ai);
1445 return NULL;
1446 }
1447 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1448 } else {
1449 /* just to make sure */
1450 ai->ai_canonname = NULL;
1451 }
1452
1453 ai->ai_next = NULL;
1454
1455 return ai;
1456}
1457
1458static int
1459get_portmatch(const struct addrinfo *ai, const char *servname)
1460{
1461
1462 /* get_port does not touch first argument when matchonly == 1. */
1463 /* LINTED const cast */
1464 return get_port((struct addrinfo *)ai, servname, 1);
1465}
1466
1467static int
1468get_port(struct addrinfo *ai, const char *servname, int matchonly)
1469{
1470 const char *proto;
1471 struct servent *sp;
1472 int port, error;
1473 int allownumeric;
1474
1475 if (servname == NULL)
1476 return 0;
1477 switch (ai->ai_family) {
1478 case AF_LOCAL:
1479 /* AF_LOCAL ignores servname silently. */
1480 return (0);
1481 case AF_INET:
1482#ifdef AF_INET6
1483 case AF_INET6:
1484#endif
1485 break;
1486 default:
1487 return 0;
1488 }
1489
1490 switch (ai->ai_socktype) {
1491 case SOCK_RAW:
1492 return EAI_SERVICE;
1493 case SOCK_DGRAM:
1494 case SOCK_STREAM:
1495 case SOCK_SEQPACKET:
1496 allownumeric = 1;
1497 break;
1498 case ANY:
1499 switch (ai->ai_family) {
1500 case AF_INET:
1501#ifdef AF_INET6
1502 case AF_INET6:
1503#endif
1504 allownumeric = 1;
1505 break;
1506 default:
1507 allownumeric = 0;
1508 break;
1509 }
1510 break;
1511 default:
1512 return EAI_SOCKTYPE;
1513 }
1514
1515 error = str2number(servname, &port);
1516 if (error == 0) {
1517 if (!allownumeric)
1518 return EAI_SERVICE;
1519 if (port < 0 || port > 65535)
1520 return EAI_SERVICE;
1521 port = htons(port);
1522 } else {
1523 if (ai->ai_flags & AI_NUMERICSERV)
1524 return EAI_NONAME;
1525
1526 switch (ai->ai_protocol) {
1527 case IPPROTO_UDP:
1528 proto = "udp";
1529 break;
1530 case IPPROTO_TCP:
1531 proto = "tcp";
1532 break;
1533 case IPPROTO_SCTP:
1534 proto = "sctp";
1535 break;
1536 case IPPROTO_UDPLITE:
1537 proto = "udplite";
1538 break;
1539 default:
1540 proto = NULL;
1541 break;
1542 }
1543
1544 if ((sp = getservbyname(servname, proto)) == NULL)
1545 return EAI_SERVICE;
1546 port = sp->s_port;
1547 }
1548
1549 if (!matchonly) {
1550 switch (ai->ai_family) {
1551 case AF_INET:
1552 ((struct sockaddr_in *)(void *)
1553 ai->ai_addr)->sin_port = port;
1554 break;
1555#ifdef INET6
1556 case AF_INET6:
1557 ((struct sockaddr_in6 *)(void *)
1558 ai->ai_addr)->sin6_port = port;
1559 break;
1560#endif
1561 }
1562 }
1563
1564 return 0;
1565}
1566
1567static const struct afd *
1568find_afd(int af)
1569{
1570 const struct afd *afd;
1571
1572 if (af == PF_UNSPEC)
1573 return NULL;
1574 for (afd = afdl; afd->a_af; afd++) {
1575 if (afd->a_af == af)
1576 return afd;
1577 }
1578 return NULL;
1579}
1580
1581/*
1582 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1583 * configured on the local system and correlates with pai->ai_family value.
1584 * If an address family is not configured on the system, it will not be
1585 * queried for. For this purpose, loopback addresses are not considered
1586 * configured addresses.
1587 *
1588 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1589 * _dns_getaddrinfo.
1590 */
1591static int
1592addrconfig(struct addrinfo *pai)
1593{
1594 struct ifaddrs *ifaddrs, *ifa;
1595 struct sockaddr_in *sin;
1596#ifdef INET6
1597 struct sockaddr_in6 *sin6;
1598#endif
1599 int seen_inet = 0, seen_inet6 = 0;
1600
1601 if (getifaddrs(&ifaddrs) != 0)
1602 return (0);
1603
1604 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1605 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1606 continue;
1607 switch (ifa->ifa_addr->sa_family) {
1608 case AF_INET:
1609 if (seen_inet)
1610 continue;
1611 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1612 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1613 continue;
1614 seen_inet = 1;
1615 break;
1616#ifdef INET6
1617 case AF_INET6:
1618 if (seen_inet6)
1619 continue;
1620 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1621 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1622 continue;
1623 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1624 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1625 continue;
1626 if (is_ifdisabled(ifa->ifa_name))
1627 continue;
1628 seen_inet6 = 1;
1629 break;
1630#endif
1631 }
1632 }
1633 freeifaddrs(ifaddrs);
1634
1635 switch(pai->ai_family) {
1636 case AF_INET6:
1637 return (seen_inet6);
1638 case AF_INET:
1639 return (seen_inet);
1640 case AF_UNSPEC:
1641 if (seen_inet == seen_inet6)
1642 return (seen_inet);
1643 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1644 return (1);
1645 }
1646 return (1);
1647}
1648
1649#ifdef INET6
1650static int
1651is_ifdisabled(char *name)
1652{
1653 struct in6_ndireq nd;
1654 int fd;
1655
1656 if ((fd = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1657 return (-1);
1658 memset(&nd, 0, sizeof(nd));
1659 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1660 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1661 _close(fd);
1662 return (-1);
1663 }
1664 _close(fd);
1665 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1666}
1667
1668/* convert a string to a scope identifier. XXX: IPv6 specific */
1669static int
1670ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1671{
1672 u_long lscopeid;
1673 struct in6_addr *a6;
1674 char *ep;
1675
1676 a6 = &sin6->sin6_addr;
1677
1678 /* empty scopeid portion is invalid */
1679 if (*scope == '\0')
1680 return -1;
1681
1682 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1683 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1684 /*
1685 * We currently assume a one-to-one mapping between links
1686 * and interfaces, so we simply use interface indices for
1687 * like-local scopes.
1688 */
1689 *scopeid = if_nametoindex(scope);
1690 if (*scopeid == 0)
1691 goto trynumeric;
1692 return 0;
1693 }
1694
1695 /* still unclear about literal, allow numeric only - placeholder */
1696 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1697 goto trynumeric;
1698 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1699 goto trynumeric;
1700 else
1701 goto trynumeric; /* global */
1702
1703 /* try to convert to a numeric id as a last resort */
1704 trynumeric:
1705 errno = 0;
1706 lscopeid = strtoul(scope, &ep, 10);
1707 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1708 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1709 return 0;
1710 else
1711 return -1;
1712}
1713#endif
1714
1715
1716#ifdef NS_CACHING
1717static int
1718addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1719 void *cache_mdata)
1720{
1721 res_state statp;
1722 u_long res_options;
1723
1724 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1725 char *hostname;
1726 struct addrinfo *hints;
1727
1728 char *p;
1729 int ai_flags, ai_family, ai_socktype, ai_protocol;
1730 size_t desired_size, size;
1731
1732 statp = __res_state();
1733 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1734 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1735
1736 hostname = va_arg(ap, char *);
1737 hints = va_arg(ap, struct addrinfo *);
1738
1739 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1740 if (hostname != NULL) {
1741 size = strlen(hostname);
1742 desired_size += size + 1;
1743 } else
1744 size = 0;
1745
1746 if (desired_size > *buffer_size) {
1747 *buffer_size = desired_size;
1748 return (NS_RETURN);
1749 }
1750
1751 if (hints == NULL)
1752 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1753 else {
1754 ai_flags = hints->ai_flags;
1755 ai_family = hints->ai_family;
1756 ai_socktype = hints->ai_socktype;
1757 ai_protocol = hints->ai_protocol;
1758 }
1759
1760 p = buffer;
1761 memcpy(p, &res_options, sizeof(res_options));
1762 p += sizeof(res_options);
1763
1764 memcpy(p, &op_id, sizeof(int));
1765 p += sizeof(int);
1766
1767 memcpy(p, &ai_flags, sizeof(int));
1768 p += sizeof(int);
1769
1770 memcpy(p, &ai_family, sizeof(int));
1771 p += sizeof(int);
1772
1773 memcpy(p, &ai_socktype, sizeof(int));
1774 p += sizeof(int);
1775
1776 memcpy(p, &ai_protocol, sizeof(int));
1777 p += sizeof(int);
1778
1779 if (hostname != NULL)
1780 memcpy(p, hostname, size);
1781
1782 *buffer_size = desired_size;
1783 return (NS_SUCCESS);
1784}
1785
1786static int
1787addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1788 va_list ap, void *cache_mdata)
1789{
1790 struct addrinfo *ai, *cai;
1791 char *p;
1792 size_t desired_size, size, ai_size;
1793
1794 ai = *((struct addrinfo **)retval);
1795
1796 desired_size = sizeof(size_t);
1797 ai_size = 0;
1798 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1799 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1800 if (cai->ai_canonname != NULL)
1801 desired_size += sizeof(size_t) +
1802 strlen(cai->ai_canonname);
1803 ++ai_size;
1804 }
1805
1806 if (desired_size > *buffer_size) {
1807 /* this assignment is here for future use */
1808 errno = ERANGE;
1809 *buffer_size = desired_size;
1810 return (NS_RETURN);
1811 }
1812
1813 memset(buffer, 0, desired_size);
1814 p = buffer;
1815
1816 memcpy(p, &ai_size, sizeof(size_t));
1817 p += sizeof(size_t);
1818 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1819 memcpy(p, cai, sizeof(struct addrinfo));
1820 p += sizeof(struct addrinfo);
1821
1822 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1823 p += cai->ai_addrlen;
1824
1825 if (cai->ai_canonname != NULL) {
1826 size = strlen(cai->ai_canonname);
1827 memcpy(p, &size, sizeof(size_t));
1828 p += sizeof(size_t);
1829
1830 memcpy(p, cai->ai_canonname, size);
1831 p += size;
1832 }
1833 }
1834
1835 return (NS_SUCCESS);
1836}
1837
1838static int
1839addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1840 va_list ap, void *cache_mdata)
1841{
1842 struct addrinfo new_ai, *result, *sentinel, *lasts;
1843
1844 char *p;
1845 size_t ai_size, ai_i, size;
1846
1847 p = buffer;
1848 memcpy(&ai_size, p, sizeof(size_t));
1849 p += sizeof(size_t);
1850
1851 result = NULL;
1852 lasts = NULL;
1853 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1854 memcpy(&new_ai, p, sizeof(struct addrinfo));
1855 p += sizeof(struct addrinfo);
1856 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1857 _ALIGNBYTES;
1858
1859 sentinel = (struct addrinfo *)malloc(size);
1860 memset(sentinel, 0, size);
1861
1862 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1863 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1864 sizeof(struct addrinfo));
1865
1866 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1867 p += new_ai.ai_addrlen;
1868
1869 if (new_ai.ai_canonname != NULL) {
1870 memcpy(&size, p, sizeof(size_t));
1871 p += sizeof(size_t);
1872
1873 sentinel->ai_canonname = (char *)malloc(size + 1);
1874 memset(sentinel->ai_canonname, 0, size + 1);
1875
1876 memcpy(sentinel->ai_canonname, p, size);
1877 p += size;
1878 }
1879
1880 if (result == NULL) {
1881 result = sentinel;
1882 lasts = sentinel;
1883 } else {
1884 lasts->ai_next = sentinel;
1885 lasts = sentinel;
1886 }
1887 }
1888
1889 *((struct addrinfo **)retval) = result;
1890 return (NS_SUCCESS);
1891}
1892#endif /* NS_CACHING */
1893
1894/*
1895 * FQDN hostname, DNS lookup
1896 */
1897static int
1898explore_fqdn(const struct addrinfo *pai, const char *hostname,
1899 const char *servname, struct addrinfo **res)
1900{
1901 struct addrinfo *result;
1902 struct addrinfo *cur;
1903 int error = 0;
1904
1905#ifdef NS_CACHING
1906 static const nss_cache_info cache_info =
1907 NS_COMMON_CACHE_INFO_INITIALIZER(
1908 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1909 addrinfo_unmarshal_func);
1910#endif
1911 static const ns_dtab dtab[] = {
1912 NS_FILES_CB(_files_getaddrinfo, NULL)
1913 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1914 NS_NIS_CB(_yp_getaddrinfo, NULL)
1915#ifdef NS_CACHING
1916 NS_CACHE_CB(&cache_info)
1917#endif
1918 { 0 }
1919 };
1920
1921 result = NULL;
1922
1923 /*
1924 * if the servname does not match socktype/protocol, ignore it.
1925 */
1926 if (get_portmatch(pai, servname) != 0)
1927 return 0;
1928
1929 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1930 default_dns_files, hostname, pai)) {
1931 case NS_TRYAGAIN:
1932 error = EAI_AGAIN;
1933 goto free;
1934 case NS_UNAVAIL:
1935 error = EAI_FAIL;
1936 goto free;
1937 case NS_NOTFOUND:
1938 error = EAI_NONAME;
1939 goto free;
1940 case NS_SUCCESS:
1941 error = 0;
1942 for (cur = result; cur; cur = cur->ai_next) {
1943 GET_PORT(cur, servname);
1944 /* canonname should be filled already */
1945 }
1946 break;
1947 }
1948
1949 *res = result;
1950
1951 return 0;
1952
1953free:
1954 if (result)
1955 freeaddrinfo(result);
1956 return error;
1957}
1958
1959#ifdef DEBUG
1960static const char AskedForGot[] =
1961 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1962#endif
1963
1964static struct addrinfo *
1965getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1966 const struct addrinfo *pai, res_state res)
1967{
1968 struct addrinfo sentinel, *cur;
1969 struct addrinfo ai;
1970 const struct afd *afd;
1971 char *canonname;
1972 const HEADER *hp;
1973 const u_char *cp;
1974 int n;
1975 const u_char *eom;
1976 char *bp, *ep;
1977 int type, class, ancount, qdcount;
1978 int haveanswer, had_error;
1979 char tbuf[MAXDNAME];
1980 int (*name_ok)(const char *);
1981 char hostbuf[8*1024];
1982
1983 memset(&sentinel, 0, sizeof(sentinel));
1984 cur = &sentinel;
1985
1986 canonname = NULL;
1987 eom = answer->buf + anslen;
1988 switch (qtype) {
1989 case T_A:
1990 case T_AAAA:
1991 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1992 name_ok = res_hnok;
1993 break;
1994 default:
1995 return (NULL); /* XXX should be abort(); */
1996 }
1997 /*
1998 * find first satisfactory answer
1999 */
2000 hp = &answer->hdr;
2001 ancount = ntohs(hp->ancount);
2002 qdcount = ntohs(hp->qdcount);
2003 bp = hostbuf;
2004 ep = hostbuf + sizeof hostbuf;
2005 cp = answer->buf + HFIXEDSZ;
2006 if (qdcount != 1) {
2007 RES_SET_H_ERRNO(res, NO_RECOVERY);
2008 return (NULL);
2009 }
2010 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2011 if ((n < 0) || !(*name_ok)(bp)) {
2012 RES_SET_H_ERRNO(res, NO_RECOVERY);
2013 return (NULL);
2014 }
2015 cp += n + QFIXEDSZ;
2016 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2017 /* res_send() has already verified that the query name is the
2018 * same as the one we sent; this just gets the expanded name
2019 * (i.e., with the succeeding search-domain tacked on).
2020 */
2021 n = strlen(bp) + 1; /* for the \0 */
2022 if (n >= MAXHOSTNAMELEN) {
2023 RES_SET_H_ERRNO(res, NO_RECOVERY);
2024 return (NULL);
2025 }
2026 canonname = bp;
2027 bp += n;
2028 /* The qname can be abbreviated, but h_name is now absolute. */
2029 qname = canonname;
2030 }
2031 haveanswer = 0;
2032 had_error = 0;
2033 while (ancount-- > 0 && cp < eom && !had_error) {
2034 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2035 if ((n < 0) || !(*name_ok)(bp)) {
2036 had_error++;
2037 continue;
2038 }
2039 cp += n; /* name */
2040 type = _getshort(cp);
2041 cp += INT16SZ; /* type */
2042 class = _getshort(cp);
2043 cp += INT16SZ + INT32SZ; /* class, TTL */
2044 n = _getshort(cp);
2045 cp += INT16SZ; /* len */
2046 if (class != C_IN) {
2047 /* XXX - debug? syslog? */
2048 cp += n;
2049 continue; /* XXX - had_error++ ? */
2050 }
2051 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2052 type == T_CNAME) {
2053 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2054 if ((n < 0) || !(*name_ok)(tbuf)) {
2055 had_error++;
2056 continue;
2057 }
2058 cp += n;
2059 /* Get canonical name. */
2060 n = strlen(tbuf) + 1; /* for the \0 */
2061 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2062 had_error++;
2063 continue;
2064 }
2065 strlcpy(bp, tbuf, ep - bp);
2066 canonname = bp;
2067 bp += n;
2068 continue;
2069 }
2070 if (qtype == T_ANY) {
2071 if (!(type == T_A || type == T_AAAA)) {
2072 cp += n;
2073 continue;
2074 }
2075 } else if (type != qtype) {
2076#ifdef DEBUG
2077 if (type != T_KEY && type != T_SIG &&
2078 type != ns_t_dname)
2079 syslog(LOG_NOTICE|LOG_AUTH,
2080 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2081 qname, p_class(C_IN), p_type(qtype),
2082 p_type(type));
2083#endif
2084 cp += n;
2085 continue; /* XXX - had_error++ ? */
2086 }
2087 switch (type) {
2088 case T_A:
2089 case T_AAAA:
2090 if (strcasecmp(canonname, bp) != 0) {
2091#ifdef DEBUG
2092 syslog(LOG_NOTICE|LOG_AUTH,
2093 AskedForGot, canonname, bp);
2094#endif
2095 cp += n;
2096 continue; /* XXX - had_error++ ? */
2097 }
2098 if (type == T_A && n != INADDRSZ) {
2099 cp += n;
2100 continue;
2101 }
2102 if (type == T_AAAA && n != IN6ADDRSZ) {
2103 cp += n;
2104 continue;
2105 }
2106#ifdef FILTER_V4MAPPED
2107 if (type == T_AAAA) {
2108 struct in6_addr in6;
2109 memcpy(&in6, cp, sizeof(in6));
2110 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2111 cp += n;
2112 continue;
2113 }
2114 }
2115#endif
2116 if (!haveanswer) {
2117 int nn;
2118
2119 canonname = bp;
2120 nn = strlen(bp) + 1; /* for the \0 */
2121 bp += nn;
2122 }
2123
2124 /* don't overwrite pai */
2125 ai = *pai;
2126 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2127 afd = find_afd(ai.ai_family);
2128 if (afd == NULL) {
2129 cp += n;
2130 continue;
2131 }
2132 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2133 if (cur->ai_next == NULL)
2134 had_error++;
2135 while (cur && cur->ai_next)
2136 cur = cur->ai_next;
2137 cp += n;
2138 break;
2139 default:
2140 abort();
2141 }
2142 if (!had_error)
2143 haveanswer++;
2144 }
2145 if (haveanswer) {
2146#if defined(RESOLVSORT)
2147 /*
2148 * We support only IPv4 address for backward
2149 * compatibility against gethostbyname(3).
2150 */
2151 if (res->nsort && qtype == T_A) {
2152 if (addr4sort(&sentinel, res) < 0) {
2153 freeaddrinfo(sentinel.ai_next);
2154 RES_SET_H_ERRNO(res, NO_RECOVERY);
2155 return NULL;
2156 }
2157 }
2158#endif /*RESOLVSORT*/
2159 if (!canonname)
2160 (void)get_canonname(pai, sentinel.ai_next, qname);
2161 else
2162 (void)get_canonname(pai, sentinel.ai_next, canonname);
2163 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2164 return sentinel.ai_next;
2165 }
2166
2167 /*
2168 * We could have walked a CNAME chain, but the ultimate target
2169 * may not have what we looked for.
2170 */
2171 RES_SET_H_ERRNO(res, ntohs(hp->ancount) > 0 ? NO_DATA : NO_RECOVERY);
2172 return NULL;
2173}
2174
2175#ifdef RESOLVSORT
2176struct addr_ptr {
2177 struct addrinfo *ai;
2178 int aval;
2179};
2180
2181static int
2182addr4sort(struct addrinfo *sentinel, res_state res)
2183{
2184 struct addrinfo *ai;
2185 struct addr_ptr *addrs, addr;
2186 struct sockaddr_in *sin;
2187 int naddrs, i, j;
2188 int needsort = 0;
2189
2190 if (!sentinel)
2191 return -1;
2192 naddrs = 0;
2193 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2194 naddrs++;
2195 if (naddrs < 2)
2196 return 0; /* We don't need sorting. */
2197 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2198 return -1;
2199 i = 0;
2200 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2201 sin = (struct sockaddr_in *)ai->ai_addr;
2202 for (j = 0; (unsigned)j < res->nsort; j++) {
2203 if (res->sort_list[j].addr.s_addr ==
2204 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2205 break;
2206 }
2207 addrs[i].ai = ai;
2208 addrs[i].aval = j;
2209 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2210 needsort = i;
2211 i++;
2212 }
2213 if (!needsort) {
2214 free(addrs);
2215 return 0;
2216 }
2217
2218 while (needsort < naddrs) {
2219 for (j = needsort - 1; j >= 0; j--) {
2220 if (addrs[j].aval > addrs[j+1].aval) {
2221 addr = addrs[j];
2222 addrs[j] = addrs[j + 1];
2223 addrs[j + 1] = addr;
2224 } else
2225 break;
2226 }
2227 needsort++;
2228 }
2229
2230 ai = sentinel;
2231 for (i = 0; i < naddrs; ++i) {
2232 ai->ai_next = addrs[i].ai;
2233 ai = ai->ai_next;
2234 }
2235 ai->ai_next = NULL;
2236 free(addrs);
2237 return 0;
2238}
2239#endif /*RESOLVSORT*/
2240
2241/*ARGSUSED*/
2242static int
2243_dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2244{
2245 struct addrinfo *ai, ai0;
2246 querybuf *buf, *buf2;
2247 const char *hostname;
2248 const struct addrinfo *pai;
2249 struct addrinfo sentinel, *cur;
2250 struct res_target q, q2;
2251 res_state res;
2252
2253 hostname = va_arg(ap, char *);
2254 pai = va_arg(ap, const struct addrinfo *);
2255
2256 memset(&q, 0, sizeof(q));
2257 memset(&q2, 0, sizeof(q2));
2258 memset(&sentinel, 0, sizeof(sentinel));
2259 cur = &sentinel;
2260
2261 res = __res_state();
2262
2263 buf = malloc(sizeof(*buf));
2264 if (!buf) {
2265 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2266 return NS_NOTFOUND;
2267 }
2268 buf2 = malloc(sizeof(*buf2));
2269 if (!buf2) {
2270 free(buf);
2271 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2272 return NS_NOTFOUND;
2273 }
2274
2275 if (pai->ai_family == AF_INET6 &&
2276 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2277 ai0 = *pai;
2278 ai0.ai_family = AF_UNSPEC;
2279 pai = &ai0;
2280 }
2281
2282 switch (pai->ai_family) {
2283 case AF_UNSPEC:
2284 q.name = hostname;
2285 q.qclass = C_IN;
2286 q.qtype = T_A;
2287 q.answer = buf->buf;
2288 q.anslen = sizeof(buf->buf);
2289 q.next = &q2;
2290 q2.name = hostname;
2291 q2.qclass = C_IN;
2292 q2.qtype = T_AAAA;
2293 q2.answer = buf2->buf;
2294 q2.anslen = sizeof(buf2->buf);
2295 break;
2296 case AF_INET:
2297 q.name = hostname;
2298 q.qclass = C_IN;
2299 q.qtype = T_A;
2300 q.answer = buf->buf;
2301 q.anslen = sizeof(buf->buf);
2302 break;
2303 case AF_INET6:
2304 q.name = hostname;
2305 q.qclass = C_IN;
2306 q.qtype = T_AAAA;
2307 q.answer = buf->buf;
2308 q.anslen = sizeof(buf->buf);
2309 break;
2310 default:
2311 free(buf);
2312 free(buf2);
2313 return NS_UNAVAIL;
2314 }
2315
2316 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2317 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2318 free(buf);
2319 free(buf2);
2320 return NS_NOTFOUND;
2321 }
2322
2323 if (res_searchN(hostname, &q, res) < 0) {
2324 free(buf);
2325 free(buf2);
2326 return NS_NOTFOUND;
2327 }
2328 /* prefer IPv6 */
2329 if (q.next) {
2330 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2331 if (ai) {
2332 cur->ai_next = ai;
2333 while (cur && cur->ai_next)
2334 cur = cur->ai_next;
2335 }
2336 }
2337 if (!ai || pai->ai_family != AF_UNSPEC ||
2338 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2339 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2340 if (ai)
2341 cur->ai_next = ai;
2342 }
2343 free(buf);
2344 free(buf2);
2345 if (sentinel.ai_next == NULL)
2346 switch (res->res_h_errno) {
2347 case HOST_NOT_FOUND:
2348 case NO_DATA:
2349 return NS_NOTFOUND;
2350 case TRY_AGAIN:
2351 return NS_TRYAGAIN;
2352 default:
2353 return NS_UNAVAIL;
2354 }
2355 *((struct addrinfo **)rv) = sentinel.ai_next;
2356 return NS_SUCCESS;
2357}
2358
2359static void
2360_sethtent(FILE **hostf)
2361{
2362 if (!*hostf)
2363 *hostf = fopen(_PATH_HOSTS, "re");
2364 else
2365 rewind(*hostf);
2366}
2367
2368static void
2369_endhtent(FILE **hostf)
2370{
2371 if (*hostf) {
2372 (void) fclose(*hostf);
2373 *hostf = NULL;
2374 }
2375}
2376
2377static struct addrinfo *
2378_gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2379{
2380 char *p;
2381 char *cp, *tname, *cname;
2382 struct addrinfo hints, *res0, *res;
2383 int error;
2384 const char *addr;
2385 char hostbuf[8*1024];
2386
2387 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re")))
2388 return (NULL);
2389again:
2390 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2391 return (NULL);
2392 if (*p == '#')
2393 goto again;
2394 cp = strpbrk(p, "#\n");
2395 if (cp != NULL)
2396 *cp = '\0';
2397 if (!(cp = strpbrk(p, " \t")))
2398 goto again;
2399 *cp++ = '\0';
2400 addr = p;
2401 cname = NULL;
2402 /* if this is not something we're looking for, skip it. */
2403 while (cp && *cp) {
2404 if (*cp == ' ' || *cp == '\t') {
2405 cp++;
2406 continue;
2407 }
2408 tname = cp;
2409 if (cname == NULL)
2410 cname = cp;
2411 if ((cp = strpbrk(cp, " \t")) != NULL)
2412 *cp++ = '\0';
2413 if (strcasecmp(name, tname) == 0)
2414 goto found;
2415 }
2416 goto again;
2417
2418found:
2419 /* we should not glob socktype/protocol here */
2420 memset(&hints, 0, sizeof(hints));
2421 hints.ai_family = pai->ai_family;
2422 hints.ai_socktype = SOCK_DGRAM;
2423 hints.ai_protocol = 0;
2424 hints.ai_flags = AI_NUMERICHOST;
2425 if (pai->ai_family == AF_INET6 &&
2426 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2427 hints.ai_flags |= AI_V4MAPPED;
2428 error = getaddrinfo(addr, "0", &hints, &res0);
2429 if (error)
2430 goto again;
2431#ifdef FILTER_V4MAPPED
2432 /* XXX should check all items in the chain */
2433 if (res0->ai_family == AF_INET6 &&
2434 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2435 freeaddrinfo(res0);
2436 goto again;
2437 }
2438#endif
2439 for (res = res0; res; res = res->ai_next) {
2440 /* cover it up */
2441 res->ai_flags = pai->ai_flags;
2442 res->ai_socktype = pai->ai_socktype;
2443 res->ai_protocol = pai->ai_protocol;
2444
2445 if (pai->ai_flags & AI_CANONNAME) {
2446 if (get_canonname(pai, res, cname) != 0) {
2447 freeaddrinfo(res0);
2448 goto again;
2449 }
2450 }
2451 }
2452 return res0;
2453}
2454
2455static struct addrinfo *
2456_getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2457 struct addrinfo *cur)
2458{
2459 struct addrinfo *p;
2460
2461 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2462 cur->ai_next = p;
2463 while (cur && cur->ai_next)
2464 cur = cur->ai_next;
2465 }
2466 return (cur);
2467}
2468
2469/*ARGSUSED*/
2470static int
2471_files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2472{
2473 const char *name;
2474 const struct addrinfo *pai;
2475 struct addrinfo sentinel, *cur;
2476 FILE *hostf = NULL;
2477
2478 name = va_arg(ap, char *);
2479 pai = va_arg(ap, struct addrinfo *);
2480
2481 memset(&sentinel, 0, sizeof(sentinel));
2482 cur = &sentinel;
2483
2484 _sethtent(&hostf);
2485 if (pai->ai_family == AF_INET6 &&
2486 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2487 struct addrinfo ai0 = *pai;
2488
2489 ai0.ai_flags &= ~AI_V4MAPPED;
2490 cur = _getht(&hostf, name, &ai0, cur);
2491 if (sentinel.ai_next == NULL) {
2492 _sethtent(&hostf);
2493 ai0.ai_flags |= AI_V4MAPPED;
2494 cur = _getht(&hostf, name, &ai0, cur);
2495 }
2496 } else
2497 cur = _getht(&hostf, name, pai, cur);
2498 _endhtent(&hostf);
2499
2500 *((struct addrinfo **)rv) = sentinel.ai_next;
2501 if (sentinel.ai_next == NULL)
2502 return NS_NOTFOUND;
2503 return NS_SUCCESS;
2504}
2505
2506#ifdef YP
2507/*ARGSUSED*/
2508static struct addrinfo *
2509_yphostent(char *line, const struct addrinfo *pai)
2510{
2511 struct addrinfo sentinel, *cur;
2512 struct addrinfo hints, *res, *res0;
2513 int error;
2514 char *p = line;
2515 const char *addr, *canonname;
2516 char *nextline;
2517 char *cp;
2518
2519 addr = canonname = NULL;
2520
2521 memset(&sentinel, 0, sizeof(sentinel));
2522 cur = &sentinel;
2523
2524nextline:
2525 /* terminate line */
2526 cp = strchr(p, '\n');
2527 if (cp) {
2528 *cp++ = '\0';
2529 nextline = cp;
2530 } else
2531 nextline = NULL;
2532
2533 cp = strpbrk(p, " \t");
2534 if (cp == NULL) {
2535 if (canonname == NULL)
2536 return (NULL);
2537 else
2538 goto done;
2539 }
2540 *cp++ = '\0';
2541
2542 addr = p;
2543
2544 while (cp && *cp) {
2545 if (*cp == ' ' || *cp == '\t') {
2546 cp++;
2547 continue;
2548 }
2549 if (!canonname)
2550 canonname = cp;
2551 if ((cp = strpbrk(cp, " \t")) != NULL)
2552 *cp++ = '\0';
2553 }
2554
2555 hints = *pai;
2556 hints.ai_flags = AI_NUMERICHOST;
2557 if (pai->ai_family == AF_INET6 &&
2558 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2559 hints.ai_flags |= AI_V4MAPPED;
2560 error = getaddrinfo(addr, NULL, &hints, &res0);
2561 if (error == 0) {
2562 for (res = res0; res; res = res->ai_next) {
2563 /* cover it up */
2564 res->ai_flags = pai->ai_flags;
2565
2566 if (pai->ai_flags & AI_CANONNAME)
2567 (void)get_canonname(pai, res, canonname);
2568 }
2569 } else
2570 res0 = NULL;
2571 if (res0) {
2572 cur->ai_next = res0;
2573 while (cur && cur->ai_next)
2574 cur = cur->ai_next;
2575 }
2576
2577 if (nextline) {
2578 p = nextline;
2579 goto nextline;
2580 }
2581
2582done:
2583 return sentinel.ai_next;
2584}
2585
2586/*ARGSUSED*/
2587static int
2588_yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2589{
2590 struct addrinfo sentinel, *cur;
2591 struct addrinfo *ai = NULL;
2592 char *ypbuf;
2593 int ypbuflen, r;
2594 const char *name;
2595 const struct addrinfo *pai;
2596 char *ypdomain;
2597
2598 if (_yp_check(&ypdomain) == 0)
2599 return NS_UNAVAIL;
2600
2601 name = va_arg(ap, char *);
2602 pai = va_arg(ap, const struct addrinfo *);
2603
2604 memset(&sentinel, 0, sizeof(sentinel));
2605 cur = &sentinel;
2606
2607 /* ipnodes.byname can hold both IPv4/v6 */
2608 r = yp_match(ypdomain, "ipnodes.byname", name,
2609 (int)strlen(name), &ypbuf, &ypbuflen);
2610 if (r == 0) {
2611 ai = _yphostent(ypbuf, pai);
2612 if (ai) {
2613 cur->ai_next = ai;
2614 while (cur && cur->ai_next)
2615 cur = cur->ai_next;
2616 }
2617 free(ypbuf);
2618 }
2619
2620 if (ai != NULL) {
2621 struct sockaddr_in6 *sin6;
2622
2623 switch (ai->ai_family) {
2624 case AF_INET:
2625 goto done;
2626 case AF_INET6:
2627 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2628 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2629 goto done;
2630 break;
2631 }
2632 }
2633
2634 /* hosts.byname is only for IPv4 (Solaris8) */
2635 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2636 ((pai->ai_family == AF_INET6 &&
2637 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2638 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2639 r = yp_match(ypdomain, "hosts.byname", name,
2640 (int)strlen(name), &ypbuf, &ypbuflen);
2641 if (r == 0) {
2642 struct addrinfo ai4;
2643
2644 ai4 = *pai;
2645 if (pai->ai_family == AF_UNSPEC)
2646 ai4.ai_family = AF_INET;
2647 ai = _yphostent(ypbuf, &ai4);
2648 if (ai) {
2649 cur->ai_next = ai;
2650 while (cur && cur->ai_next)
2651 cur = cur->ai_next;
2652 }
2653 free(ypbuf);
2654 }
2655 }
2656
2657done:
2658 if (sentinel.ai_next == NULL) {
2659 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2660 return NS_NOTFOUND;
2661 }
2662 *((struct addrinfo **)rv) = sentinel.ai_next;
2663 return NS_SUCCESS;
2664}
2665#endif
2666
2667/* resolver logic */
2668
2669/*
2670 * Formulate a normal query, send, and await answer.
2671 * Returned answer is placed in supplied buffer "answer".
2672 * Perform preliminary check of answer, returning success only
2673 * if no error is indicated and the answer count is nonzero.
2674 * Return the size of the response on success, -1 on error.
2675 * Error number is left in h_errno.
2676 *
2677 * Caller must parse answer and determine whether it answers the question.
2678 */
2679static int
2680res_queryN(const char *name, struct res_target *target, res_state res)
2681{
2682 u_char *buf;
2683 HEADER *hp;
2684 int n;
2685 u_int oflags;
2686 struct res_target *t;
2687 int rcode;
2688 int ancount;
2689
2690 rcode = NOERROR;
2691 ancount = 0;
2692
2693 buf = malloc(MAXPACKET);
2694 if (!buf) {
2695 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2696 return -1;
2697 }
2698
2699 for (t = target; t; t = t->next) {
2700 int class, type;
2701 u_char *answer;
2702 int anslen;
2703
2704 hp = (HEADER *)(void *)t->answer;
2705
2706 /* make it easier... */
2707 class = t->qclass;
2708 type = t->qtype;
2709 answer = t->answer;
2710 anslen = t->anslen;
2711
2712 oflags = res->_flags;
2713
2714again:
2715 hp->rcode = NOERROR; /* default */
2716
2717#ifdef DEBUG
2718 if (res->options & RES_DEBUG)
2719 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2720#endif
2721
2722 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2723 buf, MAXPACKET);
2724 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2725 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2726 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2727 if (n <= 0) {
2728#ifdef DEBUG
2729 if (res->options & RES_DEBUG)
2730 printf(";; res_query: mkquery failed\n");
2731#endif
2732 free(buf);
2733 RES_SET_H_ERRNO(res, NO_RECOVERY);
2734 return (n);
2735 }
2736 n = res_nsend(res, buf, n, answer, anslen);
2737 if (n < 0) {
2738 /*
2739 * if the query choked with EDNS0, retry
2740 * without EDNS0
2741 */
2742 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2743 != 0U &&
2744 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2745 res->_flags |= RES_F_EDNS0ERR;
2746 if (res->options & RES_DEBUG)
2747 printf(";; res_nquery: retry without EDNS0\n");
2748 goto again;
2749 }
2750 rcode = hp->rcode; /* record most recent error */
2751#ifdef DEBUG
2752 if (res->options & RES_DEBUG)
2753 printf(";; res_query: send error\n");
2754#endif
2755 continue;
2756 }
2757
2758 if (n > anslen)
2759 hp->rcode = FORMERR; /* XXX not very informative */
2760 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2761 rcode = hp->rcode; /* record most recent error */
2762#ifdef DEBUG
2763 if (res->options & RES_DEBUG)
2764 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2765 ntohs(hp->ancount));
2766#endif
2767 continue;
2768 }
2769
2770 ancount += ntohs(hp->ancount);
2771
2772 t->n = n;
2773 }
2774
2775 free(buf);
2776
2777 if (ancount == 0) {
2778 switch (rcode) {
2779 case NXDOMAIN:
2780 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2781 break;
2782 case SERVFAIL:
2783 RES_SET_H_ERRNO(res, TRY_AGAIN);
2784 break;
2785 case NOERROR:
2786 RES_SET_H_ERRNO(res, NO_DATA);
2787 break;
2788 case FORMERR:
2789 case NOTIMP:
2790 case REFUSED:
2791 default:
2792 RES_SET_H_ERRNO(res, NO_RECOVERY);
2793 break;
2794 }
2795 return (-1);
2796 }
2797 return (ancount);
2798}
2799
2800/*
2801 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2802 * Return the size of the response on success, -1 on error.
2803 * If enabled, implement search rules until answer or unrecoverable failure
2804 * is detected. Error code, if any, is left in h_errno.
2805 */
2806static int
2807res_searchN(const char *name, struct res_target *target, res_state res)
2808{
2809 const char *cp, * const *domain;
2810 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2811 u_int dots;
2812 int trailing_dot, ret, saved_herrno;
2813 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2814 int tried_as_is = 0;
2815 int searched = 0;
2816 char abuf[MAXDNAME];
2817
2818 errno = 0;
2819 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2820 dots = 0;
2821 for (cp = name; *cp; cp++)
2822 dots += (*cp == '.');
2823 trailing_dot = 0;
2824 if (cp > name && *--cp == '.')
2825 trailing_dot++;
2826
2827 /*
2828 * if there aren't any dots, it could be a user-level alias
2829 */
2830 if (!dots &&
2831 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2832 return (res_queryN(cp, target, res));
2833
2834 /*
2835 * If there are enough dots in the name, let's just give it a
2836 * try 'as is'. The threshold can be set with the "ndots" option.
2837 * Also, query 'as is', if there is a trailing dot in the name.
2838 */
2839 saved_herrno = -1;
2840 if (dots >= res->ndots || trailing_dot) {
2841 ret = res_querydomainN(name, NULL, target, res);
2842 if (ret > 0 || trailing_dot)
2843 return (ret);
2844 if (errno == ECONNREFUSED) {
2845 RES_SET_H_ERRNO(res, TRY_AGAIN);
2846 return (-1);
2847 }
2848 switch (res->res_h_errno) {
2849 case NO_DATA:
2850 case HOST_NOT_FOUND:
2851 break;
2852 case TRY_AGAIN:
2853 if (hp->rcode == SERVFAIL)
2854 break;
2855 /* FALLTHROUGH */
2856 default:
2857 return (-1);
2858 }
2859 saved_herrno = res->res_h_errno;
2860 tried_as_is++;
2861 }
2862
2863 /*
2864 * We do at least one level of search if
2865 * - there is no dot and RES_DEFNAME is set, or
2866 * - there is at least one dot, there is no trailing dot,
2867 * and RES_DNSRCH is set.
2868 */
2869 if ((!dots && (res->options & RES_DEFNAMES)) ||
2870 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2871 int done = 0;
2872
2873 for (domain = (const char * const *)res->dnsrch;
2874 *domain && !done;
2875 domain++) {
2876 searched = 1;
2877
2878 if (domain[0][0] == '\0' ||
2879 (domain[0][0] == '.' && domain[0][1] == '\0'))
2880 root_on_list++;
2881
2882 if (root_on_list && tried_as_is)
2883 continue;
2884
2885 ret = res_querydomainN(name, *domain, target, res);
2886 if (ret > 0)
2887 return (ret);
2888
2889 /*
2890 * If no server present, give up.
2891 * If name isn't found in this domain,
2892 * keep trying higher domains in the search list
2893 * (if that's enabled).
2894 * On a NO_DATA error, keep trying, otherwise
2895 * a wildcard entry of another type could keep us
2896 * from finding this entry higher in the domain.
2897 * If we get some other error (negative answer or
2898 * server failure), then stop searching up,
2899 * but try the input name below in case it's
2900 * fully-qualified.
2901 */
2902 if (errno == ECONNREFUSED) {
2903 RES_SET_H_ERRNO(res, TRY_AGAIN);
2904 return (-1);
2905 }
2906
2907 switch (res->res_h_errno) {
2908 case NO_DATA:
2909 got_nodata++;
2910 /* FALLTHROUGH */
2911 case HOST_NOT_FOUND:
2912 /* keep trying */
2913 break;
2914 case TRY_AGAIN:
2915 got_servfail++;
2916 if (hp->rcode == SERVFAIL) {
2917 /* try next search element, if any */
2918 break;
2919 }
2920 /* FALLTHROUGH */
2921 default:
2922 /* anything else implies that we're done */
2923 done++;
2924 }
2925 /*
2926 * if we got here for some reason other than DNSRCH,
2927 * we only wanted one iteration of the loop, so stop.
2928 */
2929 if (!(res->options & RES_DNSRCH))
2930 done++;
2931 }
2932 }
2933
2934 switch (res->res_h_errno) {
2935 case NO_DATA:
2936 case HOST_NOT_FOUND:
2937 break;
2938 case TRY_AGAIN:
2939 if (hp->rcode == SERVFAIL)
2940 break;
2941 /* FALLTHROUGH */
2942 default:
2943 goto giveup;
2944 }
2945
2946 /*
2947 * If the query has not already been tried as is then try it
2948 * unless RES_NOTLDQUERY is set and there were no dots.
2949 */
2950 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2951 !(tried_as_is || root_on_list)) {
2952 ret = res_querydomainN(name, NULL, target, res);
2953 if (ret > 0)
2954 return (ret);
2955 }
2956
2957 /*
2958 * if we got here, we didn't satisfy the search.
2959 * if we did an initial full query, return that query's h_errno
2960 * (note that we wouldn't be here if that query had succeeded).
2961 * else if we ever got a nodata, send that back as the reason.
2962 * else send back meaningless h_errno, that being the one from
2963 * the last DNSRCH we did.
2964 */
2965giveup:
2966 if (saved_herrno != -1)
2967 RES_SET_H_ERRNO(res, saved_herrno);
2968 else if (got_nodata)
2969 RES_SET_H_ERRNO(res, NO_DATA);
2970 else if (got_servfail)
2971 RES_SET_H_ERRNO(res, TRY_AGAIN);
2972 return (-1);
2973}
2974
2975/*
2976 * Perform a call on res_query on the concatenation of name and domain,
2977 * removing a trailing dot from name if domain is NULL.
2978 */
2979static int
2980res_querydomainN(const char *name, const char *domain,
2981 struct res_target *target, res_state res)
2982{
2983 char nbuf[MAXDNAME];
2984 const char *longname = nbuf;
2985 size_t n, d;
2986
2987#ifdef DEBUG
2988 if (res->options & RES_DEBUG)
2989 printf(";; res_querydomain(%s, %s)\n",
2990 name, domain?domain:"<Nil>");
2991#endif
2992 if (domain == NULL) {
2993 /*
2994 * Check for trailing '.';
2995 * copy without '.' if present.
2996 */
2997 n = strlen(name);
2998 if (n >= MAXDNAME) {
2999 RES_SET_H_ERRNO(res, NO_RECOVERY);
3000 return (-1);
3001 }
3002 if (n > 0 && name[--n] == '.') {
3003 strncpy(nbuf, name, n);
3004 nbuf[n] = '\0';
3005 } else
3006 longname = name;
3007 } else {
3008 n = strlen(name);
3009 d = strlen(domain);
3010 if (n + d + 1 >= MAXDNAME) {
3011 RES_SET_H_ERRNO(res, NO_RECOVERY);
3012 return (-1);
3013 }
3014 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3015 }
3016 return (res_queryN(longname, target, res));
3017}
| 746 free(buf);
747 return (0);
748 }
749
750 ep = (struct in6_addrpolicy *)(buf + l);
751 for (pol = (struct in6_addrpolicy *)buf; pol + 1 <= ep; pol++) {
752 struct policyqueue *new;
753
754 if ((new = malloc(sizeof(*new))) == NULL) {
755 free_addrselectpolicy(head); /* make the list empty */
756 break;
757 }
758 new->pc_policy = *pol;
759 TAILQ_INSERT_TAIL(head, new, pc_entry);
760 }
761
762 free(buf);
763 return (1);
764#else
765 return (0);
766#endif
767}
768
769static void
770free_addrselectpolicy(struct policyhead *head)
771{
772 struct policyqueue *ent, *nent;
773
774 for (ent = TAILQ_FIRST(head); ent; ent = nent) {
775 nent = TAILQ_NEXT(ent, pc_entry);
776 TAILQ_REMOVE(head, ent, pc_entry);
777 free(ent);
778 }
779}
780
781static struct policyqueue *
782match_addrselectpolicy(struct sockaddr *addr, struct policyhead *head)
783{
784#ifdef INET6
785 struct policyqueue *ent, *bestent = NULL;
786 struct in6_addrpolicy *pol;
787 int matchlen, bestmatchlen = -1;
788 u_char *mp, *ep, *k, *p, m;
789 struct sockaddr_in6 key;
790
791 switch(addr->sa_family) {
792 case AF_INET6:
793 key = *(struct sockaddr_in6 *)addr;
794 break;
795 case AF_INET:
796 /* convert the address into IPv4-mapped IPv6 address. */
797 memset(&key, 0, sizeof(key));
798 key.sin6_family = AF_INET6;
799 key.sin6_len = sizeof(key);
800 _map_v4v6_address(
801 (char *)&((struct sockaddr_in *)addr)->sin_addr,
802 (char *)&key.sin6_addr);
803 break;
804 default:
805 return(NULL);
806 }
807
808 for (ent = TAILQ_FIRST(head); ent; ent = TAILQ_NEXT(ent, pc_entry)) {
809 pol = &ent->pc_policy;
810 matchlen = 0;
811
812 mp = (u_char *)&pol->addrmask.sin6_addr;
813 ep = mp + 16; /* XXX: scope field? */
814 k = (u_char *)&key.sin6_addr;
815 p = (u_char *)&pol->addr.sin6_addr;
816 for (; mp < ep && *mp; mp++, k++, p++) {
817 m = *mp;
818 if ((*k & m) != *p)
819 goto next; /* not match */
820 if (m == 0xff) /* short cut for a typical case */
821 matchlen += 8;
822 else {
823 while (m >= 0x80) {
824 matchlen++;
825 m <<= 1;
826 }
827 }
828 }
829
830 /* matched. check if this is better than the current best. */
831 if (matchlen > bestmatchlen) {
832 bestent = ent;
833 bestmatchlen = matchlen;
834 }
835
836 next:
837 continue;
838 }
839
840 return(bestent);
841#else
842 return(NULL);
843#endif
844
845}
846
847static void
848set_source(struct ai_order *aio, struct policyhead *ph)
849{
850 struct addrinfo ai = *aio->aio_ai;
851 struct sockaddr_storage ss;
852 socklen_t srclen;
853 int s;
854
855 /* set unspec ("no source is available"), just in case */
856 aio->aio_srcsa.sa_family = AF_UNSPEC;
857 aio->aio_srcscope = -1;
858
859 switch(ai.ai_family) {
860 case AF_INET:
861#ifdef INET6
862 case AF_INET6:
863#endif
864 break;
865 default: /* ignore unsupported AFs explicitly */
866 return;
867 }
868
869 /* XXX: make a dummy addrinfo to call connect() */
870 ai.ai_socktype = SOCK_DGRAM;
871 ai.ai_protocol = IPPROTO_UDP; /* is UDP too specific? */
872 ai.ai_next = NULL;
873 memset(&ss, 0, sizeof(ss));
874 memcpy(&ss, ai.ai_addr, ai.ai_addrlen);
875 ai.ai_addr = (struct sockaddr *)&ss;
876 get_port(&ai, "1", 0);
877
878 /* open a socket to get the source address for the given dst */
879 if ((s = _socket(ai.ai_family, ai.ai_socktype | SOCK_CLOEXEC,
880 ai.ai_protocol)) < 0)
881 return; /* give up */
882#ifdef INET6
883 if (ai.ai_family == AF_INET6) {
884 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ai.ai_addr;
885 int off = 0;
886
887 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
888 (void)_setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
889 (char *)&off, sizeof(off));
890 }
891#endif
892 if (_connect(s, ai.ai_addr, ai.ai_addrlen) < 0)
893 goto cleanup;
894 srclen = ai.ai_addrlen;
895 if (_getsockname(s, &aio->aio_srcsa, &srclen) < 0) {
896 aio->aio_srcsa.sa_family = AF_UNSPEC;
897 goto cleanup;
898 }
899 aio->aio_srcscope = gai_addr2scopetype(&aio->aio_srcsa);
900 aio->aio_srcpolicy = match_addrselectpolicy(&aio->aio_srcsa, ph);
901 aio->aio_matchlen = matchlen(&aio->aio_srcsa, aio->aio_ai->ai_addr);
902#ifdef INET6
903 if (ai.ai_family == AF_INET6) {
904 struct in6_ifreq ifr6;
905 u_int32_t flags6;
906
907 memset(&ifr6, 0, sizeof(ifr6));
908 memcpy(&ifr6.ifr_addr, ai.ai_addr, ai.ai_addrlen);
909 if (_ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) == 0) {
910 flags6 = ifr6.ifr_ifru.ifru_flags6;
911 if ((flags6 & IN6_IFF_DEPRECATED))
912 aio->aio_srcflag |= AIO_SRCFLAG_DEPRECATED;
913 }
914 }
915#endif
916
917 cleanup:
918 _close(s);
919 return;
920}
921
922static int
923matchlen(struct sockaddr *src, struct sockaddr *dst)
924{
925 int match = 0;
926 u_char *s, *d;
927 u_char *lim, r;
928 int addrlen;
929
930 switch (src->sa_family) {
931#ifdef INET6
932 case AF_INET6:
933 s = (u_char *)&((struct sockaddr_in6 *)src)->sin6_addr;
934 d = (u_char *)&((struct sockaddr_in6 *)dst)->sin6_addr;
935 addrlen = sizeof(struct in6_addr);
936 lim = s + addrlen;
937 break;
938#endif
939 case AF_INET:
940 s = (u_char *)&((struct sockaddr_in *)src)->sin_addr;
941 d = (u_char *)&((struct sockaddr_in *)dst)->sin_addr;
942 addrlen = sizeof(struct in_addr);
943 lim = s + addrlen;
944 break;
945 default:
946 return(0);
947 }
948
949 while (s < lim)
950 if ((r = (*d++ ^ *s++)) != 0) {
951 while (r < addrlen * 8) {
952 match++;
953 r <<= 1;
954 }
955 break;
956 } else
957 match += 8;
958 return(match);
959}
960
961static int
962comp_dst(const void *arg1, const void *arg2)
963{
964 const struct ai_order *dst1 = arg1, *dst2 = arg2;
965
966 /*
967 * Rule 1: Avoid unusable destinations.
968 * XXX: we currently do not consider if an appropriate route exists.
969 */
970 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
971 dst2->aio_srcsa.sa_family == AF_UNSPEC) {
972 return(-1);
973 }
974 if (dst1->aio_srcsa.sa_family == AF_UNSPEC &&
975 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
976 return(1);
977 }
978
979 /* Rule 2: Prefer matching scope. */
980 if (dst1->aio_dstscope == dst1->aio_srcscope &&
981 dst2->aio_dstscope != dst2->aio_srcscope) {
982 return(-1);
983 }
984 if (dst1->aio_dstscope != dst1->aio_srcscope &&
985 dst2->aio_dstscope == dst2->aio_srcscope) {
986 return(1);
987 }
988
989 /* Rule 3: Avoid deprecated addresses. */
990 if (dst1->aio_srcsa.sa_family != AF_UNSPEC &&
991 dst2->aio_srcsa.sa_family != AF_UNSPEC) {
992 if (!(dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
993 (dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
994 return(-1);
995 }
996 if ((dst1->aio_srcflag & AIO_SRCFLAG_DEPRECATED) &&
997 !(dst2->aio_srcflag & AIO_SRCFLAG_DEPRECATED)) {
998 return(1);
999 }
1000 }
1001
1002 /* Rule 4: Prefer home addresses. */
1003 /* XXX: not implemented yet */
1004
1005 /* Rule 5: Prefer matching label. */
1006#ifdef INET6
1007 if (dst1->aio_srcpolicy && dst1->aio_dstpolicy &&
1008 dst1->aio_srcpolicy->pc_policy.label ==
1009 dst1->aio_dstpolicy->pc_policy.label &&
1010 (dst2->aio_srcpolicy == NULL || dst2->aio_dstpolicy == NULL ||
1011 dst2->aio_srcpolicy->pc_policy.label !=
1012 dst2->aio_dstpolicy->pc_policy.label)) {
1013 return(-1);
1014 }
1015 if (dst2->aio_srcpolicy && dst2->aio_dstpolicy &&
1016 dst2->aio_srcpolicy->pc_policy.label ==
1017 dst2->aio_dstpolicy->pc_policy.label &&
1018 (dst1->aio_srcpolicy == NULL || dst1->aio_dstpolicy == NULL ||
1019 dst1->aio_srcpolicy->pc_policy.label !=
1020 dst1->aio_dstpolicy->pc_policy.label)) {
1021 return(1);
1022 }
1023#endif
1024
1025 /* Rule 6: Prefer higher precedence. */
1026#ifdef INET6
1027 if (dst1->aio_dstpolicy &&
1028 (dst2->aio_dstpolicy == NULL ||
1029 dst1->aio_dstpolicy->pc_policy.preced >
1030 dst2->aio_dstpolicy->pc_policy.preced)) {
1031 return(-1);
1032 }
1033 if (dst2->aio_dstpolicy &&
1034 (dst1->aio_dstpolicy == NULL ||
1035 dst2->aio_dstpolicy->pc_policy.preced >
1036 dst1->aio_dstpolicy->pc_policy.preced)) {
1037 return(1);
1038 }
1039#endif
1040
1041 /* Rule 7: Prefer native transport. */
1042 /* XXX: not implemented yet */
1043
1044 /* Rule 8: Prefer smaller scope. */
1045 if (dst1->aio_dstscope >= 0 &&
1046 dst1->aio_dstscope < dst2->aio_dstscope) {
1047 return(-1);
1048 }
1049 if (dst2->aio_dstscope >= 0 &&
1050 dst2->aio_dstscope < dst1->aio_dstscope) {
1051 return(1);
1052 }
1053
1054 /*
1055 * Rule 9: Use longest matching prefix.
1056 * We compare the match length in a same AF only.
1057 */
1058 if (dst1->aio_ai->ai_addr->sa_family ==
1059 dst2->aio_ai->ai_addr->sa_family &&
1060 dst1->aio_ai->ai_addr->sa_family != AF_INET) {
1061 if (dst1->aio_matchlen > dst2->aio_matchlen) {
1062 return(-1);
1063 }
1064 if (dst1->aio_matchlen < dst2->aio_matchlen) {
1065 return(1);
1066 }
1067 }
1068
1069 /* Rule 10: Otherwise, leave the order unchanged. */
1070 return(-1);
1071}
1072
1073/*
1074 * Copy from scope.c.
1075 * XXX: we should standardize the functions and link them as standard
1076 * library.
1077 */
1078static int
1079gai_addr2scopetype(struct sockaddr *sa)
1080{
1081#ifdef INET6
1082 struct sockaddr_in6 *sa6;
1083#endif
1084 struct sockaddr_in *sa4;
1085
1086 switch(sa->sa_family) {
1087#ifdef INET6
1088 case AF_INET6:
1089 sa6 = (struct sockaddr_in6 *)sa;
1090 if (IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) {
1091 /* just use the scope field of the multicast address */
1092 return(sa6->sin6_addr.s6_addr[2] & 0x0f);
1093 }
1094 /*
1095 * Unicast addresses: map scope type to corresponding scope
1096 * value defined for multcast addresses.
1097 * XXX: hardcoded scope type values are bad...
1098 */
1099 if (IN6_IS_ADDR_LOOPBACK(&sa6->sin6_addr))
1100 return(1); /* node local scope */
1101 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr))
1102 return(2); /* link-local scope */
1103 if (IN6_IS_ADDR_SITELOCAL(&sa6->sin6_addr))
1104 return(5); /* site-local scope */
1105 return(14); /* global scope */
1106 break;
1107#endif
1108 case AF_INET:
1109 /*
1110 * IPv4 pseudo scoping according to RFC 3484.
1111 */
1112 sa4 = (struct sockaddr_in *)sa;
1113 /* IPv4 autoconfiguration addresses have link-local scope. */
1114 if (((u_char *)&sa4->sin_addr)[0] == 169 &&
1115 ((u_char *)&sa4->sin_addr)[1] == 254)
1116 return(2);
1117 /* Private addresses have site-local scope. */
1118 if (((u_char *)&sa4->sin_addr)[0] == 10 ||
1119 (((u_char *)&sa4->sin_addr)[0] == 172 &&
1120 (((u_char *)&sa4->sin_addr)[1] & 0xf0) == 16) ||
1121 (((u_char *)&sa4->sin_addr)[0] == 192 &&
1122 ((u_char *)&sa4->sin_addr)[1] == 168))
1123 return(14); /* XXX: It should be 5 unless NAT */
1124 /* Loopback addresses have link-local scope. */
1125 if (((u_char *)&sa4->sin_addr)[0] == 127)
1126 return(2);
1127 return(14);
1128 break;
1129 default:
1130 errno = EAFNOSUPPORT; /* is this a good error? */
1131 return(-1);
1132 }
1133}
1134
1135static int
1136explore_copy(const struct addrinfo *pai, const struct addrinfo *src0,
1137 struct addrinfo **res)
1138{
1139 int error;
1140 struct addrinfo sentinel, *cur;
1141 const struct addrinfo *src;
1142
1143 error = 0;
1144 sentinel.ai_next = NULL;
1145 cur = &sentinel;
1146
1147 for (src = src0; src != NULL; src = src->ai_next) {
1148 if (src->ai_family != pai->ai_family)
1149 continue;
1150
1151 cur->ai_next = copy_ai(src);
1152 if (!cur->ai_next) {
1153 error = EAI_MEMORY;
1154 goto fail;
1155 }
1156
1157 cur->ai_next->ai_socktype = pai->ai_socktype;
1158 cur->ai_next->ai_protocol = pai->ai_protocol;
1159 cur = cur->ai_next;
1160 }
1161
1162 *res = sentinel.ai_next;
1163 return 0;
1164
1165fail:
1166 freeaddrinfo(sentinel.ai_next);
1167 return error;
1168}
1169
1170/*
1171 * hostname == NULL.
1172 * passive socket -> anyaddr (0.0.0.0 or ::)
1173 * non-passive socket -> localhost (127.0.0.1 or ::1)
1174 */
1175static int
1176explore_null(const struct addrinfo *pai, const char *servname,
1177 struct addrinfo **res)
1178{
1179 int s;
1180 const struct afd *afd;
1181 struct addrinfo *ai;
1182 int error;
1183
1184 *res = NULL;
1185 ai = NULL;
1186
1187 if (pai->ai_family == PF_LOCAL)
1188 return (0);
1189
1190 /*
1191 * filter out AFs that are not supported by the kernel
1192 * XXX errno?
1193 */
1194 s = _socket(pai->ai_family, SOCK_DGRAM | SOCK_CLOEXEC, 0);
1195 if (s < 0) {
1196 if (errno != EMFILE)
1197 return 0;
1198 } else
1199 _close(s);
1200
1201 afd = find_afd(pai->ai_family);
1202 if (afd == NULL)
1203 return 0;
1204
1205 if (pai->ai_flags & AI_PASSIVE) {
1206 GET_AI(ai, afd, afd->a_addrany);
1207 GET_PORT(ai, servname);
1208 } else {
1209 GET_AI(ai, afd, afd->a_loopback);
1210 GET_PORT(ai, servname);
1211 }
1212
1213 *res = ai;
1214 return 0;
1215
1216free:
1217 if (ai != NULL)
1218 freeaddrinfo(ai);
1219 return error;
1220}
1221
1222/*
1223 * numeric hostname
1224 */
1225static int
1226explore_numeric(const struct addrinfo *pai, const char *hostname,
1227 const char *servname, struct addrinfo **res, const char *canonname)
1228{
1229 const struct afd *afd;
1230 struct addrinfo *ai, ai0;
1231 int error;
1232 char pton[PTON_MAX], path[PATH_MAX], *p;
1233
1234#ifdef CTASSERT
1235 CTASSERT(sizeofmember(struct sockaddr_un, sun_path) <= PATH_MAX);
1236#endif
1237 *res = NULL;
1238 ai = NULL;
1239
1240 afd = find_afd(pai->ai_family);
1241 if (afd == NULL)
1242 return 0;
1243
1244 switch (afd->a_af) {
1245 case AF_LOCAL:
1246 if (hostname[0] != '/')
1247 ERR(EAI_NONAME);
1248 if (strlen(hostname) > afd->a_addrlen)
1249 ERR(EAI_MEMORY);
1250 /* NUL-termination does not need to be guaranteed. */
1251 strncpy(path, hostname, afd->a_addrlen);
1252 p = &path[0];
1253 break;
1254 case AF_INET:
1255 /*
1256 * RFC3493 requires getaddrinfo() to accept AF_INET formats
1257 * that are accepted by inet_addr() and its family. The
1258 * accepted forms includes the "classful" one, which inet_pton
1259 * does not accept. So we need to separate the case for
1260 * AF_INET.
1261 */
1262 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1263 return 0;
1264 p = pton;
1265 break;
1266 default:
1267 if (inet_pton(afd->a_af, hostname, pton) != 1) {
1268 if (pai->ai_family != AF_INET6 ||
1269 (pai->ai_flags & AI_V4MAPPED) != AI_V4MAPPED)
1270 return 0;
1271 if (inet_aton(hostname, (struct in_addr *)pton) != 1)
1272 return 0;
1273 afd = &afdl[N_INET];
1274 ai0 = *pai;
1275 ai0.ai_family = AF_INET;
1276 pai = &ai0;
1277 }
1278 p = pton;
1279 break;
1280 }
1281
1282 if (pai->ai_family == afd->a_af) {
1283 GET_AI(ai, afd, p);
1284 GET_PORT(ai, servname);
1285 if ((pai->ai_family == AF_INET ||
1286 pai->ai_family == AF_INET6) &&
1287 (pai->ai_flags & AI_CANONNAME)) {
1288 /*
1289 * Set the numeric address itself as the canonical
1290 * name, based on a clarification in RFC3493.
1291 */
1292 GET_CANONNAME(ai, canonname);
1293 }
1294 } else {
1295 /*
1296 * XXX: This should not happen since we already matched the AF
1297 * by find_afd.
1298 */
1299 ERR(EAI_FAMILY);
1300 }
1301
1302 *res = ai;
1303 return 0;
1304
1305free:
1306bad:
1307 if (ai != NULL)
1308 freeaddrinfo(ai);
1309 return error;
1310}
1311
1312/*
1313 * numeric hostname with scope
1314 */
1315static int
1316explore_numeric_scope(const struct addrinfo *pai, const char *hostname,
1317 const char *servname, struct addrinfo **res)
1318{
1319#if !defined(SCOPE_DELIMITER) || !defined(INET6)
1320 return explore_numeric(pai, hostname, servname, res, hostname);
1321#else
1322 const struct afd *afd;
1323 struct addrinfo *cur;
1324 int error;
1325 char *cp, *hostname2 = NULL, *scope, *addr;
1326 struct sockaddr_in6 *sin6;
1327
1328 afd = find_afd(pai->ai_family);
1329 if (afd == NULL)
1330 return 0;
1331
1332 if (!afd->a_scoped)
1333 return explore_numeric(pai, hostname, servname, res, hostname);
1334
1335 cp = strchr(hostname, SCOPE_DELIMITER);
1336 if (cp == NULL)
1337 return explore_numeric(pai, hostname, servname, res, hostname);
1338
1339 /*
1340 * Handle special case of <scoped_address><delimiter><scope id>
1341 */
1342 hostname2 = strdup(hostname);
1343 if (hostname2 == NULL)
1344 return EAI_MEMORY;
1345 /* terminate at the delimiter */
1346 hostname2[cp - hostname] = '\0';
1347 addr = hostname2;
1348 scope = cp + 1;
1349
1350 error = explore_numeric(pai, addr, servname, res, hostname);
1351 if (error == 0) {
1352 u_int32_t scopeid;
1353
1354 for (cur = *res; cur; cur = cur->ai_next) {
1355 if (cur->ai_family != AF_INET6)
1356 continue;
1357 sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr;
1358 if (ip6_str2scopeid(scope, sin6, &scopeid) == -1) {
1359 free(hostname2);
1360 freeaddrinfo(*res);
1361 *res = NULL;
1362 return(EAI_NONAME); /* XXX: is return OK? */
1363 }
1364 sin6->sin6_scope_id = scopeid;
1365 }
1366 }
1367
1368 free(hostname2);
1369
1370 if (error && *res) {
1371 freeaddrinfo(*res);
1372 *res = NULL;
1373 }
1374 return error;
1375#endif
1376}
1377
1378static int
1379get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str)
1380{
1381 if ((pai->ai_flags & AI_CANONNAME) != 0) {
1382 ai->ai_canonname = strdup(str);
1383 if (ai->ai_canonname == NULL)
1384 return EAI_MEMORY;
1385 }
1386 return 0;
1387}
1388
1389static struct addrinfo *
1390get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr)
1391{
1392 char *p;
1393 struct addrinfo *ai;
1394#ifdef INET6
1395 struct in6_addr mapaddr;
1396
1397 if (afd->a_af == AF_INET && (pai->ai_flags & AI_V4MAPPED) != 0) {
1398 afd = &afdl[N_INET6];
1399 _map_v4v6_address(addr, (char *)&mapaddr);
1400 addr = (char *)&mapaddr;
1401 }
1402#endif
1403
1404 ai = (struct addrinfo *)malloc(sizeof(struct addrinfo)
1405 + (afd->a_socklen));
1406 if (ai == NULL)
1407 return NULL;
1408
1409 memcpy(ai, pai, sizeof(struct addrinfo));
1410 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1411 memset(ai->ai_addr, 0, (size_t)afd->a_socklen);
1412 ai->ai_addr->sa_len = afd->a_socklen;
1413 ai->ai_addrlen = afd->a_socklen;
1414 if (ai->ai_family == PF_LOCAL) {
1415 size_t n = strnlen(addr, afd->a_addrlen);
1416
1417 ai->ai_addrlen -= afd->a_addrlen - n;
1418 ai->ai_addr->sa_len -= afd->a_addrlen - n;
1419 }
1420 ai->ai_addr->sa_family = ai->ai_family = afd->a_af;
1421 p = (char *)(void *)(ai->ai_addr);
1422 memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen);
1423 return ai;
1424}
1425
1426/* XXX need to malloc() the same way we do from other functions! */
1427static struct addrinfo *
1428copy_ai(const struct addrinfo *pai)
1429{
1430 struct addrinfo *ai;
1431 size_t l;
1432
1433 l = sizeof(*ai) + pai->ai_addrlen;
1434 if ((ai = (struct addrinfo *)malloc(l)) == NULL)
1435 return NULL;
1436 memset(ai, 0, l);
1437 memcpy(ai, pai, sizeof(*ai));
1438 ai->ai_addr = (struct sockaddr *)(void *)(ai + 1);
1439 memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen);
1440
1441 if (pai->ai_canonname) {
1442 l = strlen(pai->ai_canonname) + 1;
1443 if ((ai->ai_canonname = malloc(l)) == NULL) {
1444 free(ai);
1445 return NULL;
1446 }
1447 strlcpy(ai->ai_canonname, pai->ai_canonname, l);
1448 } else {
1449 /* just to make sure */
1450 ai->ai_canonname = NULL;
1451 }
1452
1453 ai->ai_next = NULL;
1454
1455 return ai;
1456}
1457
1458static int
1459get_portmatch(const struct addrinfo *ai, const char *servname)
1460{
1461
1462 /* get_port does not touch first argument when matchonly == 1. */
1463 /* LINTED const cast */
1464 return get_port((struct addrinfo *)ai, servname, 1);
1465}
1466
1467static int
1468get_port(struct addrinfo *ai, const char *servname, int matchonly)
1469{
1470 const char *proto;
1471 struct servent *sp;
1472 int port, error;
1473 int allownumeric;
1474
1475 if (servname == NULL)
1476 return 0;
1477 switch (ai->ai_family) {
1478 case AF_LOCAL:
1479 /* AF_LOCAL ignores servname silently. */
1480 return (0);
1481 case AF_INET:
1482#ifdef AF_INET6
1483 case AF_INET6:
1484#endif
1485 break;
1486 default:
1487 return 0;
1488 }
1489
1490 switch (ai->ai_socktype) {
1491 case SOCK_RAW:
1492 return EAI_SERVICE;
1493 case SOCK_DGRAM:
1494 case SOCK_STREAM:
1495 case SOCK_SEQPACKET:
1496 allownumeric = 1;
1497 break;
1498 case ANY:
1499 switch (ai->ai_family) {
1500 case AF_INET:
1501#ifdef AF_INET6
1502 case AF_INET6:
1503#endif
1504 allownumeric = 1;
1505 break;
1506 default:
1507 allownumeric = 0;
1508 break;
1509 }
1510 break;
1511 default:
1512 return EAI_SOCKTYPE;
1513 }
1514
1515 error = str2number(servname, &port);
1516 if (error == 0) {
1517 if (!allownumeric)
1518 return EAI_SERVICE;
1519 if (port < 0 || port > 65535)
1520 return EAI_SERVICE;
1521 port = htons(port);
1522 } else {
1523 if (ai->ai_flags & AI_NUMERICSERV)
1524 return EAI_NONAME;
1525
1526 switch (ai->ai_protocol) {
1527 case IPPROTO_UDP:
1528 proto = "udp";
1529 break;
1530 case IPPROTO_TCP:
1531 proto = "tcp";
1532 break;
1533 case IPPROTO_SCTP:
1534 proto = "sctp";
1535 break;
1536 case IPPROTO_UDPLITE:
1537 proto = "udplite";
1538 break;
1539 default:
1540 proto = NULL;
1541 break;
1542 }
1543
1544 if ((sp = getservbyname(servname, proto)) == NULL)
1545 return EAI_SERVICE;
1546 port = sp->s_port;
1547 }
1548
1549 if (!matchonly) {
1550 switch (ai->ai_family) {
1551 case AF_INET:
1552 ((struct sockaddr_in *)(void *)
1553 ai->ai_addr)->sin_port = port;
1554 break;
1555#ifdef INET6
1556 case AF_INET6:
1557 ((struct sockaddr_in6 *)(void *)
1558 ai->ai_addr)->sin6_port = port;
1559 break;
1560#endif
1561 }
1562 }
1563
1564 return 0;
1565}
1566
1567static const struct afd *
1568find_afd(int af)
1569{
1570 const struct afd *afd;
1571
1572 if (af == PF_UNSPEC)
1573 return NULL;
1574 for (afd = afdl; afd->a_af; afd++) {
1575 if (afd->a_af == af)
1576 return afd;
1577 }
1578 return NULL;
1579}
1580
1581/*
1582 * RFC 3493: AI_ADDRCONFIG check. Determines which address families are
1583 * configured on the local system and correlates with pai->ai_family value.
1584 * If an address family is not configured on the system, it will not be
1585 * queried for. For this purpose, loopback addresses are not considered
1586 * configured addresses.
1587 *
1588 * XXX PF_UNSPEC -> PF_INET6 + PF_INET mapping needs to be in sync with
1589 * _dns_getaddrinfo.
1590 */
1591static int
1592addrconfig(struct addrinfo *pai)
1593{
1594 struct ifaddrs *ifaddrs, *ifa;
1595 struct sockaddr_in *sin;
1596#ifdef INET6
1597 struct sockaddr_in6 *sin6;
1598#endif
1599 int seen_inet = 0, seen_inet6 = 0;
1600
1601 if (getifaddrs(&ifaddrs) != 0)
1602 return (0);
1603
1604 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
1605 if (ifa->ifa_addr == NULL || (ifa->ifa_flags & IFF_UP) == 0)
1606 continue;
1607 switch (ifa->ifa_addr->sa_family) {
1608 case AF_INET:
1609 if (seen_inet)
1610 continue;
1611 sin = (struct sockaddr_in *)(ifa->ifa_addr);
1612 if (htonl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
1613 continue;
1614 seen_inet = 1;
1615 break;
1616#ifdef INET6
1617 case AF_INET6:
1618 if (seen_inet6)
1619 continue;
1620 sin6 = (struct sockaddr_in6 *)(ifa->ifa_addr);
1621 if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
1622 continue;
1623 if ((ifa->ifa_flags & IFT_LOOP) != 0 &&
1624 IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
1625 continue;
1626 if (is_ifdisabled(ifa->ifa_name))
1627 continue;
1628 seen_inet6 = 1;
1629 break;
1630#endif
1631 }
1632 }
1633 freeifaddrs(ifaddrs);
1634
1635 switch(pai->ai_family) {
1636 case AF_INET6:
1637 return (seen_inet6);
1638 case AF_INET:
1639 return (seen_inet);
1640 case AF_UNSPEC:
1641 if (seen_inet == seen_inet6)
1642 return (seen_inet);
1643 pai->ai_family = seen_inet ? AF_INET : AF_INET6;
1644 return (1);
1645 }
1646 return (1);
1647}
1648
1649#ifdef INET6
1650static int
1651is_ifdisabled(char *name)
1652{
1653 struct in6_ndireq nd;
1654 int fd;
1655
1656 if ((fd = _socket(AF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0)) < 0)
1657 return (-1);
1658 memset(&nd, 0, sizeof(nd));
1659 strlcpy(nd.ifname, name, sizeof(nd.ifname));
1660 if (_ioctl(fd, SIOCGIFINFO_IN6, &nd) < 0) {
1661 _close(fd);
1662 return (-1);
1663 }
1664 _close(fd);
1665 return ((nd.ndi.flags & ND6_IFF_IFDISABLED) != 0);
1666}
1667
1668/* convert a string to a scope identifier. XXX: IPv6 specific */
1669static int
1670ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6, u_int32_t *scopeid)
1671{
1672 u_long lscopeid;
1673 struct in6_addr *a6;
1674 char *ep;
1675
1676 a6 = &sin6->sin6_addr;
1677
1678 /* empty scopeid portion is invalid */
1679 if (*scope == '\0')
1680 return -1;
1681
1682 if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6) ||
1683 IN6_IS_ADDR_MC_NODELOCAL(a6)) {
1684 /*
1685 * We currently assume a one-to-one mapping between links
1686 * and interfaces, so we simply use interface indices for
1687 * like-local scopes.
1688 */
1689 *scopeid = if_nametoindex(scope);
1690 if (*scopeid == 0)
1691 goto trynumeric;
1692 return 0;
1693 }
1694
1695 /* still unclear about literal, allow numeric only - placeholder */
1696 if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6))
1697 goto trynumeric;
1698 if (IN6_IS_ADDR_MC_ORGLOCAL(a6))
1699 goto trynumeric;
1700 else
1701 goto trynumeric; /* global */
1702
1703 /* try to convert to a numeric id as a last resort */
1704 trynumeric:
1705 errno = 0;
1706 lscopeid = strtoul(scope, &ep, 10);
1707 *scopeid = (u_int32_t)(lscopeid & 0xffffffffUL);
1708 if (errno == 0 && ep && *ep == '\0' && *scopeid == lscopeid)
1709 return 0;
1710 else
1711 return -1;
1712}
1713#endif
1714
1715
1716#ifdef NS_CACHING
1717static int
1718addrinfo_id_func(char *buffer, size_t *buffer_size, va_list ap,
1719 void *cache_mdata)
1720{
1721 res_state statp;
1722 u_long res_options;
1723
1724 const int op_id = 0; /* identifies the getaddrinfo for the cache */
1725 char *hostname;
1726 struct addrinfo *hints;
1727
1728 char *p;
1729 int ai_flags, ai_family, ai_socktype, ai_protocol;
1730 size_t desired_size, size;
1731
1732 statp = __res_state();
1733 res_options = statp->options & (RES_RECURSE | RES_DEFNAMES |
1734 RES_DNSRCH | RES_NOALIASES | RES_USE_INET6);
1735
1736 hostname = va_arg(ap, char *);
1737 hints = va_arg(ap, struct addrinfo *);
1738
1739 desired_size = sizeof(res_options) + sizeof(int) + sizeof(int) * 4;
1740 if (hostname != NULL) {
1741 size = strlen(hostname);
1742 desired_size += size + 1;
1743 } else
1744 size = 0;
1745
1746 if (desired_size > *buffer_size) {
1747 *buffer_size = desired_size;
1748 return (NS_RETURN);
1749 }
1750
1751 if (hints == NULL)
1752 ai_flags = ai_family = ai_socktype = ai_protocol = 0;
1753 else {
1754 ai_flags = hints->ai_flags;
1755 ai_family = hints->ai_family;
1756 ai_socktype = hints->ai_socktype;
1757 ai_protocol = hints->ai_protocol;
1758 }
1759
1760 p = buffer;
1761 memcpy(p, &res_options, sizeof(res_options));
1762 p += sizeof(res_options);
1763
1764 memcpy(p, &op_id, sizeof(int));
1765 p += sizeof(int);
1766
1767 memcpy(p, &ai_flags, sizeof(int));
1768 p += sizeof(int);
1769
1770 memcpy(p, &ai_family, sizeof(int));
1771 p += sizeof(int);
1772
1773 memcpy(p, &ai_socktype, sizeof(int));
1774 p += sizeof(int);
1775
1776 memcpy(p, &ai_protocol, sizeof(int));
1777 p += sizeof(int);
1778
1779 if (hostname != NULL)
1780 memcpy(p, hostname, size);
1781
1782 *buffer_size = desired_size;
1783 return (NS_SUCCESS);
1784}
1785
1786static int
1787addrinfo_marshal_func(char *buffer, size_t *buffer_size, void *retval,
1788 va_list ap, void *cache_mdata)
1789{
1790 struct addrinfo *ai, *cai;
1791 char *p;
1792 size_t desired_size, size, ai_size;
1793
1794 ai = *((struct addrinfo **)retval);
1795
1796 desired_size = sizeof(size_t);
1797 ai_size = 0;
1798 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1799 desired_size += sizeof(struct addrinfo) + cai->ai_addrlen;
1800 if (cai->ai_canonname != NULL)
1801 desired_size += sizeof(size_t) +
1802 strlen(cai->ai_canonname);
1803 ++ai_size;
1804 }
1805
1806 if (desired_size > *buffer_size) {
1807 /* this assignment is here for future use */
1808 errno = ERANGE;
1809 *buffer_size = desired_size;
1810 return (NS_RETURN);
1811 }
1812
1813 memset(buffer, 0, desired_size);
1814 p = buffer;
1815
1816 memcpy(p, &ai_size, sizeof(size_t));
1817 p += sizeof(size_t);
1818 for (cai = ai; cai != NULL; cai = cai->ai_next) {
1819 memcpy(p, cai, sizeof(struct addrinfo));
1820 p += sizeof(struct addrinfo);
1821
1822 memcpy(p, cai->ai_addr, cai->ai_addrlen);
1823 p += cai->ai_addrlen;
1824
1825 if (cai->ai_canonname != NULL) {
1826 size = strlen(cai->ai_canonname);
1827 memcpy(p, &size, sizeof(size_t));
1828 p += sizeof(size_t);
1829
1830 memcpy(p, cai->ai_canonname, size);
1831 p += size;
1832 }
1833 }
1834
1835 return (NS_SUCCESS);
1836}
1837
1838static int
1839addrinfo_unmarshal_func(char *buffer, size_t buffer_size, void *retval,
1840 va_list ap, void *cache_mdata)
1841{
1842 struct addrinfo new_ai, *result, *sentinel, *lasts;
1843
1844 char *p;
1845 size_t ai_size, ai_i, size;
1846
1847 p = buffer;
1848 memcpy(&ai_size, p, sizeof(size_t));
1849 p += sizeof(size_t);
1850
1851 result = NULL;
1852 lasts = NULL;
1853 for (ai_i = 0; ai_i < ai_size; ++ai_i) {
1854 memcpy(&new_ai, p, sizeof(struct addrinfo));
1855 p += sizeof(struct addrinfo);
1856 size = new_ai.ai_addrlen + sizeof(struct addrinfo) +
1857 _ALIGNBYTES;
1858
1859 sentinel = (struct addrinfo *)malloc(size);
1860 memset(sentinel, 0, size);
1861
1862 memcpy(sentinel, &new_ai, sizeof(struct addrinfo));
1863 sentinel->ai_addr = (struct sockaddr *)_ALIGN((char *)sentinel +
1864 sizeof(struct addrinfo));
1865
1866 memcpy(sentinel->ai_addr, p, new_ai.ai_addrlen);
1867 p += new_ai.ai_addrlen;
1868
1869 if (new_ai.ai_canonname != NULL) {
1870 memcpy(&size, p, sizeof(size_t));
1871 p += sizeof(size_t);
1872
1873 sentinel->ai_canonname = (char *)malloc(size + 1);
1874 memset(sentinel->ai_canonname, 0, size + 1);
1875
1876 memcpy(sentinel->ai_canonname, p, size);
1877 p += size;
1878 }
1879
1880 if (result == NULL) {
1881 result = sentinel;
1882 lasts = sentinel;
1883 } else {
1884 lasts->ai_next = sentinel;
1885 lasts = sentinel;
1886 }
1887 }
1888
1889 *((struct addrinfo **)retval) = result;
1890 return (NS_SUCCESS);
1891}
1892#endif /* NS_CACHING */
1893
1894/*
1895 * FQDN hostname, DNS lookup
1896 */
1897static int
1898explore_fqdn(const struct addrinfo *pai, const char *hostname,
1899 const char *servname, struct addrinfo **res)
1900{
1901 struct addrinfo *result;
1902 struct addrinfo *cur;
1903 int error = 0;
1904
1905#ifdef NS_CACHING
1906 static const nss_cache_info cache_info =
1907 NS_COMMON_CACHE_INFO_INITIALIZER(
1908 hosts, NULL, addrinfo_id_func, addrinfo_marshal_func,
1909 addrinfo_unmarshal_func);
1910#endif
1911 static const ns_dtab dtab[] = {
1912 NS_FILES_CB(_files_getaddrinfo, NULL)
1913 { NSSRC_DNS, _dns_getaddrinfo, NULL }, /* force -DHESIOD */
1914 NS_NIS_CB(_yp_getaddrinfo, NULL)
1915#ifdef NS_CACHING
1916 NS_CACHE_CB(&cache_info)
1917#endif
1918 { 0 }
1919 };
1920
1921 result = NULL;
1922
1923 /*
1924 * if the servname does not match socktype/protocol, ignore it.
1925 */
1926 if (get_portmatch(pai, servname) != 0)
1927 return 0;
1928
1929 switch (_nsdispatch(&result, dtab, NSDB_HOSTS, "getaddrinfo",
1930 default_dns_files, hostname, pai)) {
1931 case NS_TRYAGAIN:
1932 error = EAI_AGAIN;
1933 goto free;
1934 case NS_UNAVAIL:
1935 error = EAI_FAIL;
1936 goto free;
1937 case NS_NOTFOUND:
1938 error = EAI_NONAME;
1939 goto free;
1940 case NS_SUCCESS:
1941 error = 0;
1942 for (cur = result; cur; cur = cur->ai_next) {
1943 GET_PORT(cur, servname);
1944 /* canonname should be filled already */
1945 }
1946 break;
1947 }
1948
1949 *res = result;
1950
1951 return 0;
1952
1953free:
1954 if (result)
1955 freeaddrinfo(result);
1956 return error;
1957}
1958
1959#ifdef DEBUG
1960static const char AskedForGot[] =
1961 "gethostby*.getanswer: asked for \"%s\", got \"%s\"";
1962#endif
1963
1964static struct addrinfo *
1965getanswer(const querybuf *answer, int anslen, const char *qname, int qtype,
1966 const struct addrinfo *pai, res_state res)
1967{
1968 struct addrinfo sentinel, *cur;
1969 struct addrinfo ai;
1970 const struct afd *afd;
1971 char *canonname;
1972 const HEADER *hp;
1973 const u_char *cp;
1974 int n;
1975 const u_char *eom;
1976 char *bp, *ep;
1977 int type, class, ancount, qdcount;
1978 int haveanswer, had_error;
1979 char tbuf[MAXDNAME];
1980 int (*name_ok)(const char *);
1981 char hostbuf[8*1024];
1982
1983 memset(&sentinel, 0, sizeof(sentinel));
1984 cur = &sentinel;
1985
1986 canonname = NULL;
1987 eom = answer->buf + anslen;
1988 switch (qtype) {
1989 case T_A:
1990 case T_AAAA:
1991 case T_ANY: /*use T_ANY only for T_A/T_AAAA lookup*/
1992 name_ok = res_hnok;
1993 break;
1994 default:
1995 return (NULL); /* XXX should be abort(); */
1996 }
1997 /*
1998 * find first satisfactory answer
1999 */
2000 hp = &answer->hdr;
2001 ancount = ntohs(hp->ancount);
2002 qdcount = ntohs(hp->qdcount);
2003 bp = hostbuf;
2004 ep = hostbuf + sizeof hostbuf;
2005 cp = answer->buf + HFIXEDSZ;
2006 if (qdcount != 1) {
2007 RES_SET_H_ERRNO(res, NO_RECOVERY);
2008 return (NULL);
2009 }
2010 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2011 if ((n < 0) || !(*name_ok)(bp)) {
2012 RES_SET_H_ERRNO(res, NO_RECOVERY);
2013 return (NULL);
2014 }
2015 cp += n + QFIXEDSZ;
2016 if (qtype == T_A || qtype == T_AAAA || qtype == T_ANY) {
2017 /* res_send() has already verified that the query name is the
2018 * same as the one we sent; this just gets the expanded name
2019 * (i.e., with the succeeding search-domain tacked on).
2020 */
2021 n = strlen(bp) + 1; /* for the \0 */
2022 if (n >= MAXHOSTNAMELEN) {
2023 RES_SET_H_ERRNO(res, NO_RECOVERY);
2024 return (NULL);
2025 }
2026 canonname = bp;
2027 bp += n;
2028 /* The qname can be abbreviated, but h_name is now absolute. */
2029 qname = canonname;
2030 }
2031 haveanswer = 0;
2032 had_error = 0;
2033 while (ancount-- > 0 && cp < eom && !had_error) {
2034 n = dn_expand(answer->buf, eom, cp, bp, ep - bp);
2035 if ((n < 0) || !(*name_ok)(bp)) {
2036 had_error++;
2037 continue;
2038 }
2039 cp += n; /* name */
2040 type = _getshort(cp);
2041 cp += INT16SZ; /* type */
2042 class = _getshort(cp);
2043 cp += INT16SZ + INT32SZ; /* class, TTL */
2044 n = _getshort(cp);
2045 cp += INT16SZ; /* len */
2046 if (class != C_IN) {
2047 /* XXX - debug? syslog? */
2048 cp += n;
2049 continue; /* XXX - had_error++ ? */
2050 }
2051 if ((qtype == T_A || qtype == T_AAAA || qtype == T_ANY) &&
2052 type == T_CNAME) {
2053 n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
2054 if ((n < 0) || !(*name_ok)(tbuf)) {
2055 had_error++;
2056 continue;
2057 }
2058 cp += n;
2059 /* Get canonical name. */
2060 n = strlen(tbuf) + 1; /* for the \0 */
2061 if (n > ep - bp || n >= MAXHOSTNAMELEN) {
2062 had_error++;
2063 continue;
2064 }
2065 strlcpy(bp, tbuf, ep - bp);
2066 canonname = bp;
2067 bp += n;
2068 continue;
2069 }
2070 if (qtype == T_ANY) {
2071 if (!(type == T_A || type == T_AAAA)) {
2072 cp += n;
2073 continue;
2074 }
2075 } else if (type != qtype) {
2076#ifdef DEBUG
2077 if (type != T_KEY && type != T_SIG &&
2078 type != ns_t_dname)
2079 syslog(LOG_NOTICE|LOG_AUTH,
2080 "gethostby*.getanswer: asked for \"%s %s %s\", got type \"%s\"",
2081 qname, p_class(C_IN), p_type(qtype),
2082 p_type(type));
2083#endif
2084 cp += n;
2085 continue; /* XXX - had_error++ ? */
2086 }
2087 switch (type) {
2088 case T_A:
2089 case T_AAAA:
2090 if (strcasecmp(canonname, bp) != 0) {
2091#ifdef DEBUG
2092 syslog(LOG_NOTICE|LOG_AUTH,
2093 AskedForGot, canonname, bp);
2094#endif
2095 cp += n;
2096 continue; /* XXX - had_error++ ? */
2097 }
2098 if (type == T_A && n != INADDRSZ) {
2099 cp += n;
2100 continue;
2101 }
2102 if (type == T_AAAA && n != IN6ADDRSZ) {
2103 cp += n;
2104 continue;
2105 }
2106#ifdef FILTER_V4MAPPED
2107 if (type == T_AAAA) {
2108 struct in6_addr in6;
2109 memcpy(&in6, cp, sizeof(in6));
2110 if (IN6_IS_ADDR_V4MAPPED(&in6)) {
2111 cp += n;
2112 continue;
2113 }
2114 }
2115#endif
2116 if (!haveanswer) {
2117 int nn;
2118
2119 canonname = bp;
2120 nn = strlen(bp) + 1; /* for the \0 */
2121 bp += nn;
2122 }
2123
2124 /* don't overwrite pai */
2125 ai = *pai;
2126 ai.ai_family = (type == T_A) ? AF_INET : AF_INET6;
2127 afd = find_afd(ai.ai_family);
2128 if (afd == NULL) {
2129 cp += n;
2130 continue;
2131 }
2132 cur->ai_next = get_ai(&ai, afd, (const char *)cp);
2133 if (cur->ai_next == NULL)
2134 had_error++;
2135 while (cur && cur->ai_next)
2136 cur = cur->ai_next;
2137 cp += n;
2138 break;
2139 default:
2140 abort();
2141 }
2142 if (!had_error)
2143 haveanswer++;
2144 }
2145 if (haveanswer) {
2146#if defined(RESOLVSORT)
2147 /*
2148 * We support only IPv4 address for backward
2149 * compatibility against gethostbyname(3).
2150 */
2151 if (res->nsort && qtype == T_A) {
2152 if (addr4sort(&sentinel, res) < 0) {
2153 freeaddrinfo(sentinel.ai_next);
2154 RES_SET_H_ERRNO(res, NO_RECOVERY);
2155 return NULL;
2156 }
2157 }
2158#endif /*RESOLVSORT*/
2159 if (!canonname)
2160 (void)get_canonname(pai, sentinel.ai_next, qname);
2161 else
2162 (void)get_canonname(pai, sentinel.ai_next, canonname);
2163 RES_SET_H_ERRNO(res, NETDB_SUCCESS);
2164 return sentinel.ai_next;
2165 }
2166
2167 /*
2168 * We could have walked a CNAME chain, but the ultimate target
2169 * may not have what we looked for.
2170 */
2171 RES_SET_H_ERRNO(res, ntohs(hp->ancount) > 0 ? NO_DATA : NO_RECOVERY);
2172 return NULL;
2173}
2174
2175#ifdef RESOLVSORT
2176struct addr_ptr {
2177 struct addrinfo *ai;
2178 int aval;
2179};
2180
2181static int
2182addr4sort(struct addrinfo *sentinel, res_state res)
2183{
2184 struct addrinfo *ai;
2185 struct addr_ptr *addrs, addr;
2186 struct sockaddr_in *sin;
2187 int naddrs, i, j;
2188 int needsort = 0;
2189
2190 if (!sentinel)
2191 return -1;
2192 naddrs = 0;
2193 for (ai = sentinel->ai_next; ai; ai = ai->ai_next)
2194 naddrs++;
2195 if (naddrs < 2)
2196 return 0; /* We don't need sorting. */
2197 if ((addrs = malloc(sizeof(struct addr_ptr) * naddrs)) == NULL)
2198 return -1;
2199 i = 0;
2200 for (ai = sentinel->ai_next; ai; ai = ai->ai_next) {
2201 sin = (struct sockaddr_in *)ai->ai_addr;
2202 for (j = 0; (unsigned)j < res->nsort; j++) {
2203 if (res->sort_list[j].addr.s_addr ==
2204 (sin->sin_addr.s_addr & res->sort_list[j].mask))
2205 break;
2206 }
2207 addrs[i].ai = ai;
2208 addrs[i].aval = j;
2209 if (needsort == 0 && i > 0 && j < addrs[i - 1].aval)
2210 needsort = i;
2211 i++;
2212 }
2213 if (!needsort) {
2214 free(addrs);
2215 return 0;
2216 }
2217
2218 while (needsort < naddrs) {
2219 for (j = needsort - 1; j >= 0; j--) {
2220 if (addrs[j].aval > addrs[j+1].aval) {
2221 addr = addrs[j];
2222 addrs[j] = addrs[j + 1];
2223 addrs[j + 1] = addr;
2224 } else
2225 break;
2226 }
2227 needsort++;
2228 }
2229
2230 ai = sentinel;
2231 for (i = 0; i < naddrs; ++i) {
2232 ai->ai_next = addrs[i].ai;
2233 ai = ai->ai_next;
2234 }
2235 ai->ai_next = NULL;
2236 free(addrs);
2237 return 0;
2238}
2239#endif /*RESOLVSORT*/
2240
2241/*ARGSUSED*/
2242static int
2243_dns_getaddrinfo(void *rv, void *cb_data, va_list ap)
2244{
2245 struct addrinfo *ai, ai0;
2246 querybuf *buf, *buf2;
2247 const char *hostname;
2248 const struct addrinfo *pai;
2249 struct addrinfo sentinel, *cur;
2250 struct res_target q, q2;
2251 res_state res;
2252
2253 hostname = va_arg(ap, char *);
2254 pai = va_arg(ap, const struct addrinfo *);
2255
2256 memset(&q, 0, sizeof(q));
2257 memset(&q2, 0, sizeof(q2));
2258 memset(&sentinel, 0, sizeof(sentinel));
2259 cur = &sentinel;
2260
2261 res = __res_state();
2262
2263 buf = malloc(sizeof(*buf));
2264 if (!buf) {
2265 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2266 return NS_NOTFOUND;
2267 }
2268 buf2 = malloc(sizeof(*buf2));
2269 if (!buf2) {
2270 free(buf);
2271 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2272 return NS_NOTFOUND;
2273 }
2274
2275 if (pai->ai_family == AF_INET6 &&
2276 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) {
2277 ai0 = *pai;
2278 ai0.ai_family = AF_UNSPEC;
2279 pai = &ai0;
2280 }
2281
2282 switch (pai->ai_family) {
2283 case AF_UNSPEC:
2284 q.name = hostname;
2285 q.qclass = C_IN;
2286 q.qtype = T_A;
2287 q.answer = buf->buf;
2288 q.anslen = sizeof(buf->buf);
2289 q.next = &q2;
2290 q2.name = hostname;
2291 q2.qclass = C_IN;
2292 q2.qtype = T_AAAA;
2293 q2.answer = buf2->buf;
2294 q2.anslen = sizeof(buf2->buf);
2295 break;
2296 case AF_INET:
2297 q.name = hostname;
2298 q.qclass = C_IN;
2299 q.qtype = T_A;
2300 q.answer = buf->buf;
2301 q.anslen = sizeof(buf->buf);
2302 break;
2303 case AF_INET6:
2304 q.name = hostname;
2305 q.qclass = C_IN;
2306 q.qtype = T_AAAA;
2307 q.answer = buf->buf;
2308 q.anslen = sizeof(buf->buf);
2309 break;
2310 default:
2311 free(buf);
2312 free(buf2);
2313 return NS_UNAVAIL;
2314 }
2315
2316 if ((res->options & RES_INIT) == 0 && res_ninit(res) == -1) {
2317 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2318 free(buf);
2319 free(buf2);
2320 return NS_NOTFOUND;
2321 }
2322
2323 if (res_searchN(hostname, &q, res) < 0) {
2324 free(buf);
2325 free(buf2);
2326 return NS_NOTFOUND;
2327 }
2328 /* prefer IPv6 */
2329 if (q.next) {
2330 ai = getanswer(buf2, q2.n, q2.name, q2.qtype, pai, res);
2331 if (ai) {
2332 cur->ai_next = ai;
2333 while (cur && cur->ai_next)
2334 cur = cur->ai_next;
2335 }
2336 }
2337 if (!ai || pai->ai_family != AF_UNSPEC ||
2338 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) != AI_V4MAPPED) {
2339 ai = getanswer(buf, q.n, q.name, q.qtype, pai, res);
2340 if (ai)
2341 cur->ai_next = ai;
2342 }
2343 free(buf);
2344 free(buf2);
2345 if (sentinel.ai_next == NULL)
2346 switch (res->res_h_errno) {
2347 case HOST_NOT_FOUND:
2348 case NO_DATA:
2349 return NS_NOTFOUND;
2350 case TRY_AGAIN:
2351 return NS_TRYAGAIN;
2352 default:
2353 return NS_UNAVAIL;
2354 }
2355 *((struct addrinfo **)rv) = sentinel.ai_next;
2356 return NS_SUCCESS;
2357}
2358
2359static void
2360_sethtent(FILE **hostf)
2361{
2362 if (!*hostf)
2363 *hostf = fopen(_PATH_HOSTS, "re");
2364 else
2365 rewind(*hostf);
2366}
2367
2368static void
2369_endhtent(FILE **hostf)
2370{
2371 if (*hostf) {
2372 (void) fclose(*hostf);
2373 *hostf = NULL;
2374 }
2375}
2376
2377static struct addrinfo *
2378_gethtent(FILE **hostf, const char *name, const struct addrinfo *pai)
2379{
2380 char *p;
2381 char *cp, *tname, *cname;
2382 struct addrinfo hints, *res0, *res;
2383 int error;
2384 const char *addr;
2385 char hostbuf[8*1024];
2386
2387 if (!*hostf && !(*hostf = fopen(_PATH_HOSTS, "re")))
2388 return (NULL);
2389again:
2390 if (!(p = fgets(hostbuf, sizeof hostbuf, *hostf)))
2391 return (NULL);
2392 if (*p == '#')
2393 goto again;
2394 cp = strpbrk(p, "#\n");
2395 if (cp != NULL)
2396 *cp = '\0';
2397 if (!(cp = strpbrk(p, " \t")))
2398 goto again;
2399 *cp++ = '\0';
2400 addr = p;
2401 cname = NULL;
2402 /* if this is not something we're looking for, skip it. */
2403 while (cp && *cp) {
2404 if (*cp == ' ' || *cp == '\t') {
2405 cp++;
2406 continue;
2407 }
2408 tname = cp;
2409 if (cname == NULL)
2410 cname = cp;
2411 if ((cp = strpbrk(cp, " \t")) != NULL)
2412 *cp++ = '\0';
2413 if (strcasecmp(name, tname) == 0)
2414 goto found;
2415 }
2416 goto again;
2417
2418found:
2419 /* we should not glob socktype/protocol here */
2420 memset(&hints, 0, sizeof(hints));
2421 hints.ai_family = pai->ai_family;
2422 hints.ai_socktype = SOCK_DGRAM;
2423 hints.ai_protocol = 0;
2424 hints.ai_flags = AI_NUMERICHOST;
2425 if (pai->ai_family == AF_INET6 &&
2426 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2427 hints.ai_flags |= AI_V4MAPPED;
2428 error = getaddrinfo(addr, "0", &hints, &res0);
2429 if (error)
2430 goto again;
2431#ifdef FILTER_V4MAPPED
2432 /* XXX should check all items in the chain */
2433 if (res0->ai_family == AF_INET6 &&
2434 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)res0->ai_addr)->sin6_addr)) {
2435 freeaddrinfo(res0);
2436 goto again;
2437 }
2438#endif
2439 for (res = res0; res; res = res->ai_next) {
2440 /* cover it up */
2441 res->ai_flags = pai->ai_flags;
2442 res->ai_socktype = pai->ai_socktype;
2443 res->ai_protocol = pai->ai_protocol;
2444
2445 if (pai->ai_flags & AI_CANONNAME) {
2446 if (get_canonname(pai, res, cname) != 0) {
2447 freeaddrinfo(res0);
2448 goto again;
2449 }
2450 }
2451 }
2452 return res0;
2453}
2454
2455static struct addrinfo *
2456_getht(FILE **hostf, const char *name, const struct addrinfo *pai,
2457 struct addrinfo *cur)
2458{
2459 struct addrinfo *p;
2460
2461 while ((p = _gethtent(hostf, name, pai)) != NULL) {
2462 cur->ai_next = p;
2463 while (cur && cur->ai_next)
2464 cur = cur->ai_next;
2465 }
2466 return (cur);
2467}
2468
2469/*ARGSUSED*/
2470static int
2471_files_getaddrinfo(void *rv, void *cb_data, va_list ap)
2472{
2473 const char *name;
2474 const struct addrinfo *pai;
2475 struct addrinfo sentinel, *cur;
2476 FILE *hostf = NULL;
2477
2478 name = va_arg(ap, char *);
2479 pai = va_arg(ap, struct addrinfo *);
2480
2481 memset(&sentinel, 0, sizeof(sentinel));
2482 cur = &sentinel;
2483
2484 _sethtent(&hostf);
2485 if (pai->ai_family == AF_INET6 &&
2486 (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) == AI_V4MAPPED) {
2487 struct addrinfo ai0 = *pai;
2488
2489 ai0.ai_flags &= ~AI_V4MAPPED;
2490 cur = _getht(&hostf, name, &ai0, cur);
2491 if (sentinel.ai_next == NULL) {
2492 _sethtent(&hostf);
2493 ai0.ai_flags |= AI_V4MAPPED;
2494 cur = _getht(&hostf, name, &ai0, cur);
2495 }
2496 } else
2497 cur = _getht(&hostf, name, pai, cur);
2498 _endhtent(&hostf);
2499
2500 *((struct addrinfo **)rv) = sentinel.ai_next;
2501 if (sentinel.ai_next == NULL)
2502 return NS_NOTFOUND;
2503 return NS_SUCCESS;
2504}
2505
2506#ifdef YP
2507/*ARGSUSED*/
2508static struct addrinfo *
2509_yphostent(char *line, const struct addrinfo *pai)
2510{
2511 struct addrinfo sentinel, *cur;
2512 struct addrinfo hints, *res, *res0;
2513 int error;
2514 char *p = line;
2515 const char *addr, *canonname;
2516 char *nextline;
2517 char *cp;
2518
2519 addr = canonname = NULL;
2520
2521 memset(&sentinel, 0, sizeof(sentinel));
2522 cur = &sentinel;
2523
2524nextline:
2525 /* terminate line */
2526 cp = strchr(p, '\n');
2527 if (cp) {
2528 *cp++ = '\0';
2529 nextline = cp;
2530 } else
2531 nextline = NULL;
2532
2533 cp = strpbrk(p, " \t");
2534 if (cp == NULL) {
2535 if (canonname == NULL)
2536 return (NULL);
2537 else
2538 goto done;
2539 }
2540 *cp++ = '\0';
2541
2542 addr = p;
2543
2544 while (cp && *cp) {
2545 if (*cp == ' ' || *cp == '\t') {
2546 cp++;
2547 continue;
2548 }
2549 if (!canonname)
2550 canonname = cp;
2551 if ((cp = strpbrk(cp, " \t")) != NULL)
2552 *cp++ = '\0';
2553 }
2554
2555 hints = *pai;
2556 hints.ai_flags = AI_NUMERICHOST;
2557 if (pai->ai_family == AF_INET6 &&
2558 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED)
2559 hints.ai_flags |= AI_V4MAPPED;
2560 error = getaddrinfo(addr, NULL, &hints, &res0);
2561 if (error == 0) {
2562 for (res = res0; res; res = res->ai_next) {
2563 /* cover it up */
2564 res->ai_flags = pai->ai_flags;
2565
2566 if (pai->ai_flags & AI_CANONNAME)
2567 (void)get_canonname(pai, res, canonname);
2568 }
2569 } else
2570 res0 = NULL;
2571 if (res0) {
2572 cur->ai_next = res0;
2573 while (cur && cur->ai_next)
2574 cur = cur->ai_next;
2575 }
2576
2577 if (nextline) {
2578 p = nextline;
2579 goto nextline;
2580 }
2581
2582done:
2583 return sentinel.ai_next;
2584}
2585
2586/*ARGSUSED*/
2587static int
2588_yp_getaddrinfo(void *rv, void *cb_data, va_list ap)
2589{
2590 struct addrinfo sentinel, *cur;
2591 struct addrinfo *ai = NULL;
2592 char *ypbuf;
2593 int ypbuflen, r;
2594 const char *name;
2595 const struct addrinfo *pai;
2596 char *ypdomain;
2597
2598 if (_yp_check(&ypdomain) == 0)
2599 return NS_UNAVAIL;
2600
2601 name = va_arg(ap, char *);
2602 pai = va_arg(ap, const struct addrinfo *);
2603
2604 memset(&sentinel, 0, sizeof(sentinel));
2605 cur = &sentinel;
2606
2607 /* ipnodes.byname can hold both IPv4/v6 */
2608 r = yp_match(ypdomain, "ipnodes.byname", name,
2609 (int)strlen(name), &ypbuf, &ypbuflen);
2610 if (r == 0) {
2611 ai = _yphostent(ypbuf, pai);
2612 if (ai) {
2613 cur->ai_next = ai;
2614 while (cur && cur->ai_next)
2615 cur = cur->ai_next;
2616 }
2617 free(ypbuf);
2618 }
2619
2620 if (ai != NULL) {
2621 struct sockaddr_in6 *sin6;
2622
2623 switch (ai->ai_family) {
2624 case AF_INET:
2625 goto done;
2626 case AF_INET6:
2627 sin6 = (struct sockaddr_in6 *)ai->ai_addr;
2628 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
2629 goto done;
2630 break;
2631 }
2632 }
2633
2634 /* hosts.byname is only for IPv4 (Solaris8) */
2635 if (pai->ai_family == AF_UNSPEC || pai->ai_family == AF_INET ||
2636 ((pai->ai_family == AF_INET6 &&
2637 (pai->ai_flags & AI_V4MAPPED) == AI_V4MAPPED) &&
2638 (ai == NULL || (pai->ai_flags & AI_ALL) == AI_ALL))) {
2639 r = yp_match(ypdomain, "hosts.byname", name,
2640 (int)strlen(name), &ypbuf, &ypbuflen);
2641 if (r == 0) {
2642 struct addrinfo ai4;
2643
2644 ai4 = *pai;
2645 if (pai->ai_family == AF_UNSPEC)
2646 ai4.ai_family = AF_INET;
2647 ai = _yphostent(ypbuf, &ai4);
2648 if (ai) {
2649 cur->ai_next = ai;
2650 while (cur && cur->ai_next)
2651 cur = cur->ai_next;
2652 }
2653 free(ypbuf);
2654 }
2655 }
2656
2657done:
2658 if (sentinel.ai_next == NULL) {
2659 RES_SET_H_ERRNO(__res_state(), HOST_NOT_FOUND);
2660 return NS_NOTFOUND;
2661 }
2662 *((struct addrinfo **)rv) = sentinel.ai_next;
2663 return NS_SUCCESS;
2664}
2665#endif
2666
2667/* resolver logic */
2668
2669/*
2670 * Formulate a normal query, send, and await answer.
2671 * Returned answer is placed in supplied buffer "answer".
2672 * Perform preliminary check of answer, returning success only
2673 * if no error is indicated and the answer count is nonzero.
2674 * Return the size of the response on success, -1 on error.
2675 * Error number is left in h_errno.
2676 *
2677 * Caller must parse answer and determine whether it answers the question.
2678 */
2679static int
2680res_queryN(const char *name, struct res_target *target, res_state res)
2681{
2682 u_char *buf;
2683 HEADER *hp;
2684 int n;
2685 u_int oflags;
2686 struct res_target *t;
2687 int rcode;
2688 int ancount;
2689
2690 rcode = NOERROR;
2691 ancount = 0;
2692
2693 buf = malloc(MAXPACKET);
2694 if (!buf) {
2695 RES_SET_H_ERRNO(res, NETDB_INTERNAL);
2696 return -1;
2697 }
2698
2699 for (t = target; t; t = t->next) {
2700 int class, type;
2701 u_char *answer;
2702 int anslen;
2703
2704 hp = (HEADER *)(void *)t->answer;
2705
2706 /* make it easier... */
2707 class = t->qclass;
2708 type = t->qtype;
2709 answer = t->answer;
2710 anslen = t->anslen;
2711
2712 oflags = res->_flags;
2713
2714again:
2715 hp->rcode = NOERROR; /* default */
2716
2717#ifdef DEBUG
2718 if (res->options & RES_DEBUG)
2719 printf(";; res_query(%s, %d, %d)\n", name, class, type);
2720#endif
2721
2722 n = res_nmkquery(res, QUERY, name, class, type, NULL, 0, NULL,
2723 buf, MAXPACKET);
2724 if (n > 0 && (res->_flags & RES_F_EDNS0ERR) == 0 &&
2725 (res->options & (RES_USE_EDNS0|RES_USE_DNSSEC)) != 0U)
2726 n = res_nopt(res, n, buf, MAXPACKET, anslen);
2727 if (n <= 0) {
2728#ifdef DEBUG
2729 if (res->options & RES_DEBUG)
2730 printf(";; res_query: mkquery failed\n");
2731#endif
2732 free(buf);
2733 RES_SET_H_ERRNO(res, NO_RECOVERY);
2734 return (n);
2735 }
2736 n = res_nsend(res, buf, n, answer, anslen);
2737 if (n < 0) {
2738 /*
2739 * if the query choked with EDNS0, retry
2740 * without EDNS0
2741 */
2742 if ((res->options & (RES_USE_EDNS0|RES_USE_DNSSEC))
2743 != 0U &&
2744 ((oflags ^ res->_flags) & RES_F_EDNS0ERR) != 0) {
2745 res->_flags |= RES_F_EDNS0ERR;
2746 if (res->options & RES_DEBUG)
2747 printf(";; res_nquery: retry without EDNS0\n");
2748 goto again;
2749 }
2750 rcode = hp->rcode; /* record most recent error */
2751#ifdef DEBUG
2752 if (res->options & RES_DEBUG)
2753 printf(";; res_query: send error\n");
2754#endif
2755 continue;
2756 }
2757
2758 if (n > anslen)
2759 hp->rcode = FORMERR; /* XXX not very informative */
2760 if (hp->rcode != NOERROR || ntohs(hp->ancount) == 0) {
2761 rcode = hp->rcode; /* record most recent error */
2762#ifdef DEBUG
2763 if (res->options & RES_DEBUG)
2764 printf(";; rcode = %u, ancount=%u\n", hp->rcode,
2765 ntohs(hp->ancount));
2766#endif
2767 continue;
2768 }
2769
2770 ancount += ntohs(hp->ancount);
2771
2772 t->n = n;
2773 }
2774
2775 free(buf);
2776
2777 if (ancount == 0) {
2778 switch (rcode) {
2779 case NXDOMAIN:
2780 RES_SET_H_ERRNO(res, HOST_NOT_FOUND);
2781 break;
2782 case SERVFAIL:
2783 RES_SET_H_ERRNO(res, TRY_AGAIN);
2784 break;
2785 case NOERROR:
2786 RES_SET_H_ERRNO(res, NO_DATA);
2787 break;
2788 case FORMERR:
2789 case NOTIMP:
2790 case REFUSED:
2791 default:
2792 RES_SET_H_ERRNO(res, NO_RECOVERY);
2793 break;
2794 }
2795 return (-1);
2796 }
2797 return (ancount);
2798}
2799
2800/*
2801 * Formulate a normal query, send, and retrieve answer in supplied buffer.
2802 * Return the size of the response on success, -1 on error.
2803 * If enabled, implement search rules until answer or unrecoverable failure
2804 * is detected. Error code, if any, is left in h_errno.
2805 */
2806static int
2807res_searchN(const char *name, struct res_target *target, res_state res)
2808{
2809 const char *cp, * const *domain;
2810 HEADER *hp = (HEADER *)(void *)target->answer; /*XXX*/
2811 u_int dots;
2812 int trailing_dot, ret, saved_herrno;
2813 int got_nodata = 0, got_servfail = 0, root_on_list = 0;
2814 int tried_as_is = 0;
2815 int searched = 0;
2816 char abuf[MAXDNAME];
2817
2818 errno = 0;
2819 RES_SET_H_ERRNO(res, HOST_NOT_FOUND); /* default, if we never query */
2820 dots = 0;
2821 for (cp = name; *cp; cp++)
2822 dots += (*cp == '.');
2823 trailing_dot = 0;
2824 if (cp > name && *--cp == '.')
2825 trailing_dot++;
2826
2827 /*
2828 * if there aren't any dots, it could be a user-level alias
2829 */
2830 if (!dots &&
2831 (cp = res_hostalias(res, name, abuf, sizeof(abuf))) != NULL)
2832 return (res_queryN(cp, target, res));
2833
2834 /*
2835 * If there are enough dots in the name, let's just give it a
2836 * try 'as is'. The threshold can be set with the "ndots" option.
2837 * Also, query 'as is', if there is a trailing dot in the name.
2838 */
2839 saved_herrno = -1;
2840 if (dots >= res->ndots || trailing_dot) {
2841 ret = res_querydomainN(name, NULL, target, res);
2842 if (ret > 0 || trailing_dot)
2843 return (ret);
2844 if (errno == ECONNREFUSED) {
2845 RES_SET_H_ERRNO(res, TRY_AGAIN);
2846 return (-1);
2847 }
2848 switch (res->res_h_errno) {
2849 case NO_DATA:
2850 case HOST_NOT_FOUND:
2851 break;
2852 case TRY_AGAIN:
2853 if (hp->rcode == SERVFAIL)
2854 break;
2855 /* FALLTHROUGH */
2856 default:
2857 return (-1);
2858 }
2859 saved_herrno = res->res_h_errno;
2860 tried_as_is++;
2861 }
2862
2863 /*
2864 * We do at least one level of search if
2865 * - there is no dot and RES_DEFNAME is set, or
2866 * - there is at least one dot, there is no trailing dot,
2867 * and RES_DNSRCH is set.
2868 */
2869 if ((!dots && (res->options & RES_DEFNAMES)) ||
2870 (dots && !trailing_dot && (res->options & RES_DNSRCH))) {
2871 int done = 0;
2872
2873 for (domain = (const char * const *)res->dnsrch;
2874 *domain && !done;
2875 domain++) {
2876 searched = 1;
2877
2878 if (domain[0][0] == '\0' ||
2879 (domain[0][0] == '.' && domain[0][1] == '\0'))
2880 root_on_list++;
2881
2882 if (root_on_list && tried_as_is)
2883 continue;
2884
2885 ret = res_querydomainN(name, *domain, target, res);
2886 if (ret > 0)
2887 return (ret);
2888
2889 /*
2890 * If no server present, give up.
2891 * If name isn't found in this domain,
2892 * keep trying higher domains in the search list
2893 * (if that's enabled).
2894 * On a NO_DATA error, keep trying, otherwise
2895 * a wildcard entry of another type could keep us
2896 * from finding this entry higher in the domain.
2897 * If we get some other error (negative answer or
2898 * server failure), then stop searching up,
2899 * but try the input name below in case it's
2900 * fully-qualified.
2901 */
2902 if (errno == ECONNREFUSED) {
2903 RES_SET_H_ERRNO(res, TRY_AGAIN);
2904 return (-1);
2905 }
2906
2907 switch (res->res_h_errno) {
2908 case NO_DATA:
2909 got_nodata++;
2910 /* FALLTHROUGH */
2911 case HOST_NOT_FOUND:
2912 /* keep trying */
2913 break;
2914 case TRY_AGAIN:
2915 got_servfail++;
2916 if (hp->rcode == SERVFAIL) {
2917 /* try next search element, if any */
2918 break;
2919 }
2920 /* FALLTHROUGH */
2921 default:
2922 /* anything else implies that we're done */
2923 done++;
2924 }
2925 /*
2926 * if we got here for some reason other than DNSRCH,
2927 * we only wanted one iteration of the loop, so stop.
2928 */
2929 if (!(res->options & RES_DNSRCH))
2930 done++;
2931 }
2932 }
2933
2934 switch (res->res_h_errno) {
2935 case NO_DATA:
2936 case HOST_NOT_FOUND:
2937 break;
2938 case TRY_AGAIN:
2939 if (hp->rcode == SERVFAIL)
2940 break;
2941 /* FALLTHROUGH */
2942 default:
2943 goto giveup;
2944 }
2945
2946 /*
2947 * If the query has not already been tried as is then try it
2948 * unless RES_NOTLDQUERY is set and there were no dots.
2949 */
2950 if ((dots || !searched || !(res->options & RES_NOTLDQUERY)) &&
2951 !(tried_as_is || root_on_list)) {
2952 ret = res_querydomainN(name, NULL, target, res);
2953 if (ret > 0)
2954 return (ret);
2955 }
2956
2957 /*
2958 * if we got here, we didn't satisfy the search.
2959 * if we did an initial full query, return that query's h_errno
2960 * (note that we wouldn't be here if that query had succeeded).
2961 * else if we ever got a nodata, send that back as the reason.
2962 * else send back meaningless h_errno, that being the one from
2963 * the last DNSRCH we did.
2964 */
2965giveup:
2966 if (saved_herrno != -1)
2967 RES_SET_H_ERRNO(res, saved_herrno);
2968 else if (got_nodata)
2969 RES_SET_H_ERRNO(res, NO_DATA);
2970 else if (got_servfail)
2971 RES_SET_H_ERRNO(res, TRY_AGAIN);
2972 return (-1);
2973}
2974
2975/*
2976 * Perform a call on res_query on the concatenation of name and domain,
2977 * removing a trailing dot from name if domain is NULL.
2978 */
2979static int
2980res_querydomainN(const char *name, const char *domain,
2981 struct res_target *target, res_state res)
2982{
2983 char nbuf[MAXDNAME];
2984 const char *longname = nbuf;
2985 size_t n, d;
2986
2987#ifdef DEBUG
2988 if (res->options & RES_DEBUG)
2989 printf(";; res_querydomain(%s, %s)\n",
2990 name, domain?domain:"<Nil>");
2991#endif
2992 if (domain == NULL) {
2993 /*
2994 * Check for trailing '.';
2995 * copy without '.' if present.
2996 */
2997 n = strlen(name);
2998 if (n >= MAXDNAME) {
2999 RES_SET_H_ERRNO(res, NO_RECOVERY);
3000 return (-1);
3001 }
3002 if (n > 0 && name[--n] == '.') {
3003 strncpy(nbuf, name, n);
3004 nbuf[n] = '\0';
3005 } else
3006 longname = name;
3007 } else {
3008 n = strlen(name);
3009 d = strlen(domain);
3010 if (n + d + 1 >= MAXDNAME) {
3011 RES_SET_H_ERRNO(res, NO_RECOVERY);
3012 return (-1);
3013 }
3014 snprintf(nbuf, sizeof(nbuf), "%s.%s", name, domain);
3015 }
3016 return (res_queryN(longname, target, res));
3017}
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