1/*
2 * Copyright (c) 1983, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
| 1/*
2 * Copyright (c) 1983, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
|
33 * $FreeBSD: head/lib/libc/net/rcmd.c 56636 2000-01-26 14:13:41Z shin $
| 33 * $FreeBSD: head/lib/libc/net/rcmd.c 56698 2000-01-27 23:07:25Z jasone $
|
34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
38#endif /* LIBC_SCCS and not lint */
39
40#include <sys/param.h>
41#include <sys/socket.h>
42#include <sys/stat.h>
43
44#include <netinet/in.h>
45#include <arpa/inet.h>
46
47#include <signal.h>
48#include <fcntl.h>
49#include <netdb.h>
50#include <unistd.h>
51#include <pwd.h>
52#include <errno.h>
53#include <stdio.h>
54#include <ctype.h>
55#include <string.h>
56#ifdef YP
57#include <rpc/rpc.h>
58#include <rpcsvc/yp_prot.h>
59#include <rpcsvc/ypclnt.h>
60#endif
61
62/* wrapper for KAME-special getnameinfo() */
63#ifndef NI_WITHSCOPEID
64#define NI_WITHSCOPEID 0
65#endif
66
67extern int innetgr __P(( const char *, const char *, const char *, const char * ));
68
69#define max(a, b) ((a > b) ? a : b)
70
71int __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
72static int __icheckhost __P((void *, char *, int, int));
73
74char paddr[INET6_ADDRSTRLEN];
75
76int
77rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
78 char **ahost;
79 u_short rport;
80 const char *locuser, *remuser, *cmd;
81 int *fd2p;
82{
83 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
84}
85
86int
87rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
88 char **ahost;
89 u_short rport;
90 const char *locuser, *remuser, *cmd;
91 int *fd2p;
92 int af;
93{
94 struct addrinfo hints, *res, *ai;
95 struct sockaddr_storage from;
96 fd_set reads;
97 long oldmask;
98 pid_t pid;
99 int s, aport, lport, timo, error;
100 char c;
101 int refused;
102 char num[8];
103
104 pid = getpid();
105
106 memset(&hints, 0, sizeof(hints));
107 hints.ai_flags = AI_CANONNAME;
108 hints.ai_family = af;
109 hints.ai_socktype = SOCK_STREAM;
110 hints.ai_protocol = 0;
111 (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
112 error = getaddrinfo(*ahost, num, &hints, &res);
113 if (error) {
114 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
115 gai_strerror(error));
116 if (error == EAI_SYSTEM)
117 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
118 strerror(errno));
119 return (-1);
120 }
121 if (res->ai_canonname)
122 *ahost = res->ai_canonname;
123 ai = res;
124 refused = 0;
125 oldmask = sigblock(sigmask(SIGURG));
126 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
127 s = rresvport_af(&lport, ai->ai_family);
128 if (s < 0) {
129 if (errno == EAGAIN)
130 (void)fprintf(stderr,
131 "rcmd: socket: All ports in use\n");
132 else
133 (void)fprintf(stderr, "rcmd: socket: %s\n",
134 strerror(errno));
135 sigsetmask(oldmask);
136 freeaddrinfo(res);
137 return (-1);
138 }
| 34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
38#endif /* LIBC_SCCS and not lint */
39
40#include <sys/param.h>
41#include <sys/socket.h>
42#include <sys/stat.h>
43
44#include <netinet/in.h>
45#include <arpa/inet.h>
46
47#include <signal.h>
48#include <fcntl.h>
49#include <netdb.h>
50#include <unistd.h>
51#include <pwd.h>
52#include <errno.h>
53#include <stdio.h>
54#include <ctype.h>
55#include <string.h>
56#ifdef YP
57#include <rpc/rpc.h>
58#include <rpcsvc/yp_prot.h>
59#include <rpcsvc/ypclnt.h>
60#endif
61
62/* wrapper for KAME-special getnameinfo() */
63#ifndef NI_WITHSCOPEID
64#define NI_WITHSCOPEID 0
65#endif
66
67extern int innetgr __P(( const char *, const char *, const char *, const char * ));
68
69#define max(a, b) ((a > b) ? a : b)
70
71int __ivaliduser __P((FILE *, u_int32_t, const char *, const char *));
72static int __icheckhost __P((void *, char *, int, int));
73
74char paddr[INET6_ADDRSTRLEN];
75
76int
77rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
78 char **ahost;
79 u_short rport;
80 const char *locuser, *remuser, *cmd;
81 int *fd2p;
82{
83 return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);
84}
85
86int
87rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)
88 char **ahost;
89 u_short rport;
90 const char *locuser, *remuser, *cmd;
91 int *fd2p;
92 int af;
93{
94 struct addrinfo hints, *res, *ai;
95 struct sockaddr_storage from;
96 fd_set reads;
97 long oldmask;
98 pid_t pid;
99 int s, aport, lport, timo, error;
100 char c;
101 int refused;
102 char num[8];
103
104 pid = getpid();
105
106 memset(&hints, 0, sizeof(hints));
107 hints.ai_flags = AI_CANONNAME;
108 hints.ai_family = af;
109 hints.ai_socktype = SOCK_STREAM;
110 hints.ai_protocol = 0;
111 (void)snprintf(num, sizeof(num), "%d", ntohs(rport));
112 error = getaddrinfo(*ahost, num, &hints, &res);
113 if (error) {
114 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
115 gai_strerror(error));
116 if (error == EAI_SYSTEM)
117 fprintf(stderr, "rcmd: getaddrinfo: %s\n",
118 strerror(errno));
119 return (-1);
120 }
121 if (res->ai_canonname)
122 *ahost = res->ai_canonname;
123 ai = res;
124 refused = 0;
125 oldmask = sigblock(sigmask(SIGURG));
126 for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
127 s = rresvport_af(&lport, ai->ai_family);
128 if (s < 0) {
129 if (errno == EAGAIN)
130 (void)fprintf(stderr,
131 "rcmd: socket: All ports in use\n");
132 else
133 (void)fprintf(stderr, "rcmd: socket: %s\n",
134 strerror(errno));
135 sigsetmask(oldmask);
136 freeaddrinfo(res);
137 return (-1);
138 }
|
139 _libc_fcntl(s, F_SETOWN, pid);
| 139 _fcntl(s, F_SETOWN, pid);
|
140 if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
141 break;
| 140 if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)
141 break;
|
142 (void)_libc_close(s);
| 142 (void)_close(s);
|
143 if (errno == EADDRINUSE) {
144 lport--;
145 continue;
146 }
147 if (errno == ECONNREFUSED)
148 refused = 1;
149 if (ai->ai_next != NULL) {
150 int oerrno = errno;
151
152 getnameinfo(ai->ai_addr, ai->ai_addrlen,
153 paddr, sizeof(paddr),
154 NULL, 0,
155 NI_NUMERICHOST|NI_WITHSCOPEID);
156 (void)fprintf(stderr, "connect to address %s: ",
157 paddr);
158 errno = oerrno;
159 perror(0);
160 ai = ai->ai_next;
161 getnameinfo(ai->ai_addr, ai->ai_addrlen,
162 paddr, sizeof(paddr),
163 NULL, 0,
164 NI_NUMERICHOST|NI_WITHSCOPEID);
165 fprintf(stderr, "Trying %s...\n", paddr);
166 continue;
167 }
168 if (refused && timo <= 16) {
| 143 if (errno == EADDRINUSE) {
144 lport--;
145 continue;
146 }
147 if (errno == ECONNREFUSED)
148 refused = 1;
149 if (ai->ai_next != NULL) {
150 int oerrno = errno;
151
152 getnameinfo(ai->ai_addr, ai->ai_addrlen,
153 paddr, sizeof(paddr),
154 NULL, 0,
155 NI_NUMERICHOST|NI_WITHSCOPEID);
156 (void)fprintf(stderr, "connect to address %s: ",
157 paddr);
158 errno = oerrno;
159 perror(0);
160 ai = ai->ai_next;
161 getnameinfo(ai->ai_addr, ai->ai_addrlen,
162 paddr, sizeof(paddr),
163 NULL, 0,
164 NI_NUMERICHOST|NI_WITHSCOPEID);
165 fprintf(stderr, "Trying %s...\n", paddr);
166 continue;
167 }
168 if (refused && timo <= 16) {
|
169 (void)_libc_sleep(timo);
| 169 struct timespec time_to_sleep, time_remaining;
170
171 time_to_sleep.tv_sec = timo;
172 time_to_sleep.tv_nsec = 0;
173 (void)_nanosleep(&time_to_sleep, &time_remaining);
174
|
170 timo *= 2;
171 ai = res;
172 refused = 0;
173 continue;
174 }
175 freeaddrinfo(res);
176 (void)fprintf(stderr, "%s: %s\n", *ahost, strerror(errno));
177 sigsetmask(oldmask);
178 return (-1);
179 }
180 lport--;
181 if (fd2p == 0) {
| 175 timo *= 2;
176 ai = res;
177 refused = 0;
178 continue;
179 }
180 freeaddrinfo(res);
181 (void)fprintf(stderr, "%s: %s\n", *ahost, strerror(errno));
182 sigsetmask(oldmask);
183 return (-1);
184 }
185 lport--;
186 if (fd2p == 0) {
|
182 _libc_write(s, "", 1);
| 187 _write(s, "", 1);
|
183 lport = 0;
184 } else {
185 char num[8];
186 int s2 = rresvport_af(&lport, ai->ai_family), s3;
187 int len = ai->ai_addrlen;
188 int nfds;
189
190 if (s2 < 0)
191 goto bad;
192 listen(s2, 1);
193 (void)snprintf(num, sizeof(num), "%d", lport);
| 188 lport = 0;
189 } else {
190 char num[8];
191 int s2 = rresvport_af(&lport, ai->ai_family), s3;
192 int len = ai->ai_addrlen;
193 int nfds;
194
195 if (s2 < 0)
196 goto bad;
197 listen(s2, 1);
198 (void)snprintf(num, sizeof(num), "%d", lport);
|
194 if (_libc_write(s, num, strlen(num)+1) != strlen(num)+1) {
| 199 if (_write(s, num, strlen(num)+1) != strlen(num)+1) {
|
195 (void)fprintf(stderr,
196 "rcmd: write (setting up stderr): %s\n",
197 strerror(errno));
| 200 (void)fprintf(stderr,
201 "rcmd: write (setting up stderr): %s\n",
202 strerror(errno));
|
198 (void)_libc_close(s2);
| 203 (void)_close(s2);
|
199 goto bad;
200 }
201 nfds = max(s, s2)+1;
202 if(nfds > FD_SETSIZE) {
203 fprintf(stderr, "rcmd: too many files\n");
| 204 goto bad;
205 }
206 nfds = max(s, s2)+1;
207 if(nfds > FD_SETSIZE) {
208 fprintf(stderr, "rcmd: too many files\n");
|
204 (void)_libc_close(s2);
| 209 (void)_close(s2);
|
205 goto bad;
206 }
207again:
208 FD_ZERO(&reads);
209 FD_SET(s, &reads);
210 FD_SET(s2, &reads);
211 errno = 0;
212 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
213 if (errno != 0)
214 (void)fprintf(stderr,
215 "rcmd: select (setting up stderr): %s\n",
216 strerror(errno));
217 else
218 (void)fprintf(stderr,
219 "select: protocol failure in circuit setup\n");
| 210 goto bad;
211 }
212again:
213 FD_ZERO(&reads);
214 FD_SET(s, &reads);
215 FD_SET(s2, &reads);
216 errno = 0;
217 if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){
218 if (errno != 0)
219 (void)fprintf(stderr,
220 "rcmd: select (setting up stderr): %s\n",
221 strerror(errno));
222 else
223 (void)fprintf(stderr,
224 "select: protocol failure in circuit setup\n");
|
220 (void)_libc_close(s2);
| 225 (void)_close(s2);
|
221 goto bad;
222 }
223 s3 = accept(s2, (struct sockaddr *)&from, &len);
224 switch (from.ss_family) {
225 case AF_INET:
226 aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
227 break;
228#ifdef INET6
229 case AF_INET6:
230 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
231 break;
232#endif
233 default:
234 aport = 0; /* error */
235 break;
236 }
237 /*
238 * XXX careful for ftp bounce attacks. If discovered, shut them
239 * down and check for the real auxiliary channel to connect.
240 */
241 if (aport == 20) {
| 226 goto bad;
227 }
228 s3 = accept(s2, (struct sockaddr *)&from, &len);
229 switch (from.ss_family) {
230 case AF_INET:
231 aport = ntohs(((struct sockaddr_in *)&from)->sin_port);
232 break;
233#ifdef INET6
234 case AF_INET6:
235 aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);
236 break;
237#endif
238 default:
239 aport = 0; /* error */
240 break;
241 }
242 /*
243 * XXX careful for ftp bounce attacks. If discovered, shut them
244 * down and check for the real auxiliary channel to connect.
245 */
246 if (aport == 20) {
|
242 _libc_close(s3);
| 247 _close(s3);
|
243 goto again;
244 }
| 248 goto again;
249 }
|
245 (void)_libc_close(s2);
| 250 (void)_close(s2);
|
246 if (s3 < 0) {
247 (void)fprintf(stderr,
248 "rcmd: accept: %s\n", strerror(errno));
249 lport = 0;
250 goto bad;
251 }
252 *fd2p = s3;
253 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
254 (void)fprintf(stderr,
255 "socket: protocol failure in circuit setup.\n");
256 goto bad2;
257 }
258 }
| 251 if (s3 < 0) {
252 (void)fprintf(stderr,
253 "rcmd: accept: %s\n", strerror(errno));
254 lport = 0;
255 goto bad;
256 }
257 *fd2p = s3;
258 if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) {
259 (void)fprintf(stderr,
260 "socket: protocol failure in circuit setup.\n");
261 goto bad2;
262 }
263 }
|
259 (void)_libc_write(s, locuser, strlen(locuser)+1);
260 (void)_libc_write(s, remuser, strlen(remuser)+1);
261 (void)_libc_write(s, cmd, strlen(cmd)+1);
262 if (_libc_read(s, &c, 1) != 1) {
| 264 (void)_write(s, locuser, strlen(locuser)+1);
265 (void)_write(s, remuser, strlen(remuser)+1);
266 (void)_write(s, cmd, strlen(cmd)+1);
267 if (_read(s, &c, 1) != 1) {
|
263 (void)fprintf(stderr,
264 "rcmd: %s: %s\n", *ahost, strerror(errno));
265 goto bad2;
266 }
267 if (c != 0) {
| 268 (void)fprintf(stderr,
269 "rcmd: %s: %s\n", *ahost, strerror(errno));
270 goto bad2;
271 }
272 if (c != 0) {
|
268 while (_libc_read(s, &c, 1) == 1) {
269 (void)_libc_write(STDERR_FILENO, &c, 1);
| 273 while (_read(s, &c, 1) == 1) {
274 (void)_write(STDERR_FILENO, &c, 1);
|
270 if (c == '\n')
271 break;
272 }
273 goto bad2;
274 }
275 sigsetmask(oldmask);
276 freeaddrinfo(res);
277 return (s);
278bad2:
279 if (lport)
| 275 if (c == '\n')
276 break;
277 }
278 goto bad2;
279 }
280 sigsetmask(oldmask);
281 freeaddrinfo(res);
282 return (s);
283bad2:
284 if (lport)
|
280 (void)_libc_close(*fd2p);
| 285 (void)_close(*fd2p);
|
281bad:
| 286bad:
|
282 (void)_libc_close(s);
| 287 (void)_close(s);
|
283 sigsetmask(oldmask);
284 freeaddrinfo(res);
285 return (-1);
286}
287
288int
289rresvport(port)
290 int *port;
291{
292 return rresvport_af(port, AF_INET);
293}
294
295int
296rresvport_af(alport, family)
297 int *alport, family;
298{
299 int i, s, len, err;
300 struct sockaddr_storage ss;
301 u_short *sport;
302
303 memset(&ss, 0, sizeof(ss));
304 ss.ss_family = family;
305 switch (family) {
306 case AF_INET:
307 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
308 sport = &((struct sockaddr_in *)&ss)->sin_port;
309 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
310 break;
311#ifdef INET6
312 case AF_INET6:
313 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
314 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
315 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
316 break;
317#endif
318 default:
319 errno = EAFNOSUPPORT;
320 return -1;
321 }
322
323 s = socket(ss.ss_family, SOCK_STREAM, 0);
324 if (s < 0)
325 return (-1);
326#if 0 /* compat_exact_traditional_rresvport_semantics */
327 sin.sin_port = htons((u_short)*alport);
328 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
329 return (s);
330 if (errno != EADDRINUSE) {
| 288 sigsetmask(oldmask);
289 freeaddrinfo(res);
290 return (-1);
291}
292
293int
294rresvport(port)
295 int *port;
296{
297 return rresvport_af(port, AF_INET);
298}
299
300int
301rresvport_af(alport, family)
302 int *alport, family;
303{
304 int i, s, len, err;
305 struct sockaddr_storage ss;
306 u_short *sport;
307
308 memset(&ss, 0, sizeof(ss));
309 ss.ss_family = family;
310 switch (family) {
311 case AF_INET:
312 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in);
313 sport = &((struct sockaddr_in *)&ss)->sin_port;
314 ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY;
315 break;
316#ifdef INET6
317 case AF_INET6:
318 ((struct sockaddr *)&ss)->sa_len = sizeof(struct sockaddr_in6);
319 sport = &((struct sockaddr_in6 *)&ss)->sin6_port;
320 ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any;
321 break;
322#endif
323 default:
324 errno = EAFNOSUPPORT;
325 return -1;
326 }
327
328 s = socket(ss.ss_family, SOCK_STREAM, 0);
329 if (s < 0)
330 return (-1);
331#if 0 /* compat_exact_traditional_rresvport_semantics */
332 sin.sin_port = htons((u_short)*alport);
333 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
334 return (s);
335 if (errno != EADDRINUSE) {
|
331 (void)_libc_close(s);
| 336 (void)_close(s);
|
332 return (-1);
333 }
334#endif
335 *sport = 0;
336 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
| 337 return (-1);
338 }
339#endif
340 *sport = 0;
341 if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) {
|
337 (void)_libc_close(s);
| 342 (void)_close(s);
|
338 return (-1);
339 }
340 *alport = (int)ntohs(*sport);
341 return (s);
342}
343
344int __check_rhosts_file = 1;
345char *__rcmd_errstr;
346
347int
348ruserok(rhost, superuser, ruser, luser)
349 const char *rhost, *ruser, *luser;
350 int superuser;
351{
352 return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
353}
354
355int
356ruserok_af(rhost, superuser, ruser, luser, af)
357 const char *rhost, *ruser, *luser;
358 int superuser, af;
359{
360 struct hostent *hp;
361 union {
362 struct in_addr addr_in;
363 struct in6_addr addr_in6;
364 } addr;
365 char **ap;
366 int ret, h_error;
367
368 if ((hp = getipnodebyname(rhost, af, AI_DEFAULT, &h_error)) == NULL)
369 return (-1);
370 ret = -1;
371 for (ap = hp->h_addr_list; *ap; ++ap) {
372 bcopy(*ap, &addr, hp->h_length);
373 if (iruserok_af(&addr, superuser, ruser, luser, af) == 0) {
374 ret = 0;
375 break;
376 }
377 }
378 freehostent(hp);
379 return (ret);
380}
381
382/*
383 * New .rhosts strategy: We are passed an ip address. We spin through
384 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
385 * has ip addresses, we don't have to trust a nameserver. When it
386 * contains hostnames, we spin through the list of addresses the nameserver
387 * gives us and look for a match.
388 *
389 * Returns 0 if ok, -1 if not ok.
390 */
391int
392iruserok(raddr, superuser, ruser, luser)
393 unsigned long raddr;
394 int superuser;
395 const char *ruser, *luser;
396{
397 return iruserok_af(&raddr, superuser, ruser, luser, AF_INET);
398}
399
400int
401iruserok_af(raddr, superuser, ruser, luser, af)
402 void *raddr;
403 int superuser;
404 const char *ruser, *luser;
405 int af;
406{
407 register char *cp;
408 struct stat sbuf;
409 struct passwd *pwd;
410 FILE *hostf;
411 uid_t uid;
412 int first;
413 char pbuf[MAXPATHLEN];
414 int len = 0;
415
416 switch (af) {
417 case AF_INET:
418 len = sizeof(struct in_addr);
419 break;
420#ifdef INET6
421 case AF_INET6:
422 len = sizeof(struct in6_addr);
423 break;
424#endif
425 }
426
427 first = 1;
428 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
429again:
430 if (hostf) {
431 if (__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
432 == 0) {
433 (void)fclose(hostf);
434 return (0);
435 }
436 (void)fclose(hostf);
437 }
438 if (first == 1 && (__check_rhosts_file || superuser)) {
439 first = 0;
440 if ((pwd = getpwnam(luser)) == NULL)
441 return (-1);
442 (void)strcpy(pbuf, pwd->pw_dir);
443 (void)strcat(pbuf, "/.rhosts");
444
445 /*
446 * Change effective uid while opening .rhosts. If root and
447 * reading an NFS mounted file system, can't read files that
448 * are protected read/write owner only.
449 */
450 uid = geteuid();
451 (void)seteuid(pwd->pw_uid);
452 hostf = fopen(pbuf, "r");
453 (void)seteuid(uid);
454
455 if (hostf == NULL)
456 return (-1);
457 /*
458 * If not a regular file, or is owned by someone other than
459 * user or root or if writeable by anyone but the owner, quit.
460 */
461 cp = NULL;
462 if (lstat(pbuf, &sbuf) < 0)
463 cp = ".rhosts lstat failed";
464 else if (!S_ISREG(sbuf.st_mode))
465 cp = ".rhosts not regular file";
466 else if (fstat(fileno(hostf), &sbuf) < 0)
467 cp = ".rhosts fstat failed";
468 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
469 cp = "bad .rhosts owner";
470 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
471 cp = ".rhosts writeable by other than owner";
472 /* If there were any problems, quit. */
473 if (cp) {
474 __rcmd_errstr = cp;
475 (void)fclose(hostf);
476 return (-1);
477 }
478 goto again;
479 }
480 return (-1);
481}
482
483/*
484 * XXX
485 * Don't make static, used by lpd(8).
486 *
487 * Returns 0 if ok, -1 if not ok.
488 */
489int
490__ivaliduser(hostf, raddr, luser, ruser)
491 FILE *hostf;
492 u_int32_t raddr;
493 const char *luser, *ruser;
494{
495 return __ivaliduser_af(hostf, &raddr, luser, ruser, AF_INET,
496 sizeof(raddr));
497}
498
499int
500__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
501 FILE *hostf;
502 void *raddr;
503 const char *luser, *ruser;
504 int af, len;
505{
506 register char *user, *p;
507 int ch;
508 char buf[MAXHOSTNAMELEN + 128]; /* host + login */
509 char hname[MAXHOSTNAMELEN];
510 struct hostent *hp;
511 /* Presumed guilty until proven innocent. */
512 int userok = 0, hostok = 0;
513 int h_error;
514#ifdef YP
515 char *ypdomain;
516
517 if (yp_get_default_domain(&ypdomain))
518 ypdomain = NULL;
519#else
520#define ypdomain NULL
521#endif
522 /* We need to get the damn hostname back for netgroup matching. */
523 if ((hp = getipnodebyaddr((char *)raddr, len, af, &h_error)) == NULL)
524 return (-1);
525 strncpy(hname, hp->h_name, sizeof(hname));
526 hname[sizeof(hname) - 1] = '\0';
527 freehostent(hp);
528
529 while (fgets(buf, sizeof(buf), hostf)) {
530 p = buf;
531 /* Skip lines that are too long. */
532 if (strchr(p, '\n') == NULL) {
533 while ((ch = getc(hostf)) != '\n' && ch != EOF);
534 continue;
535 }
536 if (*p == '\n' || *p == '#') {
537 /* comment... */
538 continue;
539 }
540 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
541 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
542 p++;
543 }
544 if (*p == ' ' || *p == '\t') {
545 *p++ = '\0';
546 while (*p == ' ' || *p == '\t')
547 p++;
548 user = p;
549 while (*p != '\n' && *p != ' ' &&
550 *p != '\t' && *p != '\0')
551 p++;
552 } else
553 user = p;
554 *p = '\0';
555 /*
556 * Do +/- and +@/-@ checking. This looks really nasty,
557 * but it matches SunOS's behavior so far as I can tell.
558 */
559 switch(buf[0]) {
560 case '+':
561 if (!buf[1]) { /* '+' matches all hosts */
562 hostok = 1;
563 break;
564 }
565 if (buf[1] == '@') /* match a host by netgroup */
566 hostok = innetgr((char *)&buf[2],
567 (char *)&hname, NULL, ypdomain);
568 else /* match a host by addr */
569 hostok = __icheckhost(raddr,(char *)&buf[1],
570 af, len);
571 break;
572 case '-': /* reject '-' hosts and all their users */
573 if (buf[1] == '@') {
574 if (innetgr((char *)&buf[2],
575 (char *)&hname, NULL, ypdomain))
576 return(-1);
577 } else {
578 if (__icheckhost(raddr,(char *)&buf[1],af,len))
579 return(-1);
580 }
581 break;
582 default: /* if no '+' or '-', do a simple match */
583 hostok = __icheckhost(raddr, buf, af, len);
584 break;
585 }
586 switch(*user) {
587 case '+':
588 if (!*(user+1)) { /* '+' matches all users */
589 userok = 1;
590 break;
591 }
592 if (*(user+1) == '@') /* match a user by netgroup */
593 userok = innetgr(user+2, NULL, ruser, ypdomain);
594 else /* match a user by direct specification */
595 userok = !(strcmp(ruser, user+1));
596 break;
597 case '-': /* if we matched a hostname, */
598 if (hostok) { /* check for user field rejections */
599 if (!*(user+1))
600 return(-1);
601 if (*(user+1) == '@') {
602 if (innetgr(user+2, NULL,
603 ruser, ypdomain))
604 return(-1);
605 } else {
606 if (!strcmp(ruser, user+1))
607 return(-1);
608 }
609 }
610 break;
611 default: /* no rejections: try to match the user */
612 if (hostok)
613 userok = !(strcmp(ruser,*user ? user : luser));
614 break;
615 }
616 if (hostok && userok)
617 return(0);
618 }
619 return (-1);
620}
621
622/*
623 * Returns "true" if match, 0 if no match.
624 */
625static int
626__icheckhost(raddr, lhost, af, len)
627 void *raddr;
628 register char *lhost;
629 int af, len;
630{
631 register struct hostent *hp;
632 char laddr[BUFSIZ]; /* xxx */
633 register char **pp;
634 int h_error;
635 int match;
636
637 /* Try for raw ip address first. */
638 if (inet_pton(af, lhost, laddr) == 1) {
639 if (memcmp(raddr, laddr, len) == 0)
640 return (1);
641 else
642 return (0);
643 }
644
645 /* Better be a hostname. */
646 if ((hp = getipnodebyname(lhost, af, AI_DEFAULT, &h_error)) == NULL)
647 return (0);
648
649 /* Spin through ip addresses. */
650 match = 0;
651 for (pp = hp->h_addr_list; *pp; ++pp)
652 if (!bcmp(raddr, *pp, len)) {
653 match = 1;
654 break;
655 }
656
657 freehostent(hp);
658 return (match);
659}
| 343 return (-1);
344 }
345 *alport = (int)ntohs(*sport);
346 return (s);
347}
348
349int __check_rhosts_file = 1;
350char *__rcmd_errstr;
351
352int
353ruserok(rhost, superuser, ruser, luser)
354 const char *rhost, *ruser, *luser;
355 int superuser;
356{
357 return ruserok_af(rhost, superuser, ruser, luser, AF_INET);
358}
359
360int
361ruserok_af(rhost, superuser, ruser, luser, af)
362 const char *rhost, *ruser, *luser;
363 int superuser, af;
364{
365 struct hostent *hp;
366 union {
367 struct in_addr addr_in;
368 struct in6_addr addr_in6;
369 } addr;
370 char **ap;
371 int ret, h_error;
372
373 if ((hp = getipnodebyname(rhost, af, AI_DEFAULT, &h_error)) == NULL)
374 return (-1);
375 ret = -1;
376 for (ap = hp->h_addr_list; *ap; ++ap) {
377 bcopy(*ap, &addr, hp->h_length);
378 if (iruserok_af(&addr, superuser, ruser, luser, af) == 0) {
379 ret = 0;
380 break;
381 }
382 }
383 freehostent(hp);
384 return (ret);
385}
386
387/*
388 * New .rhosts strategy: We are passed an ip address. We spin through
389 * hosts.equiv and .rhosts looking for a match. When the .rhosts only
390 * has ip addresses, we don't have to trust a nameserver. When it
391 * contains hostnames, we spin through the list of addresses the nameserver
392 * gives us and look for a match.
393 *
394 * Returns 0 if ok, -1 if not ok.
395 */
396int
397iruserok(raddr, superuser, ruser, luser)
398 unsigned long raddr;
399 int superuser;
400 const char *ruser, *luser;
401{
402 return iruserok_af(&raddr, superuser, ruser, luser, AF_INET);
403}
404
405int
406iruserok_af(raddr, superuser, ruser, luser, af)
407 void *raddr;
408 int superuser;
409 const char *ruser, *luser;
410 int af;
411{
412 register char *cp;
413 struct stat sbuf;
414 struct passwd *pwd;
415 FILE *hostf;
416 uid_t uid;
417 int first;
418 char pbuf[MAXPATHLEN];
419 int len = 0;
420
421 switch (af) {
422 case AF_INET:
423 len = sizeof(struct in_addr);
424 break;
425#ifdef INET6
426 case AF_INET6:
427 len = sizeof(struct in6_addr);
428 break;
429#endif
430 }
431
432 first = 1;
433 hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r");
434again:
435 if (hostf) {
436 if (__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
437 == 0) {
438 (void)fclose(hostf);
439 return (0);
440 }
441 (void)fclose(hostf);
442 }
443 if (first == 1 && (__check_rhosts_file || superuser)) {
444 first = 0;
445 if ((pwd = getpwnam(luser)) == NULL)
446 return (-1);
447 (void)strcpy(pbuf, pwd->pw_dir);
448 (void)strcat(pbuf, "/.rhosts");
449
450 /*
451 * Change effective uid while opening .rhosts. If root and
452 * reading an NFS mounted file system, can't read files that
453 * are protected read/write owner only.
454 */
455 uid = geteuid();
456 (void)seteuid(pwd->pw_uid);
457 hostf = fopen(pbuf, "r");
458 (void)seteuid(uid);
459
460 if (hostf == NULL)
461 return (-1);
462 /*
463 * If not a regular file, or is owned by someone other than
464 * user or root or if writeable by anyone but the owner, quit.
465 */
466 cp = NULL;
467 if (lstat(pbuf, &sbuf) < 0)
468 cp = ".rhosts lstat failed";
469 else if (!S_ISREG(sbuf.st_mode))
470 cp = ".rhosts not regular file";
471 else if (fstat(fileno(hostf), &sbuf) < 0)
472 cp = ".rhosts fstat failed";
473 else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid)
474 cp = "bad .rhosts owner";
475 else if (sbuf.st_mode & (S_IWGRP|S_IWOTH))
476 cp = ".rhosts writeable by other than owner";
477 /* If there were any problems, quit. */
478 if (cp) {
479 __rcmd_errstr = cp;
480 (void)fclose(hostf);
481 return (-1);
482 }
483 goto again;
484 }
485 return (-1);
486}
487
488/*
489 * XXX
490 * Don't make static, used by lpd(8).
491 *
492 * Returns 0 if ok, -1 if not ok.
493 */
494int
495__ivaliduser(hostf, raddr, luser, ruser)
496 FILE *hostf;
497 u_int32_t raddr;
498 const char *luser, *ruser;
499{
500 return __ivaliduser_af(hostf, &raddr, luser, ruser, AF_INET,
501 sizeof(raddr));
502}
503
504int
505__ivaliduser_af(hostf, raddr, luser, ruser, af, len)
506 FILE *hostf;
507 void *raddr;
508 const char *luser, *ruser;
509 int af, len;
510{
511 register char *user, *p;
512 int ch;
513 char buf[MAXHOSTNAMELEN + 128]; /* host + login */
514 char hname[MAXHOSTNAMELEN];
515 struct hostent *hp;
516 /* Presumed guilty until proven innocent. */
517 int userok = 0, hostok = 0;
518 int h_error;
519#ifdef YP
520 char *ypdomain;
521
522 if (yp_get_default_domain(&ypdomain))
523 ypdomain = NULL;
524#else
525#define ypdomain NULL
526#endif
527 /* We need to get the damn hostname back for netgroup matching. */
528 if ((hp = getipnodebyaddr((char *)raddr, len, af, &h_error)) == NULL)
529 return (-1);
530 strncpy(hname, hp->h_name, sizeof(hname));
531 hname[sizeof(hname) - 1] = '\0';
532 freehostent(hp);
533
534 while (fgets(buf, sizeof(buf), hostf)) {
535 p = buf;
536 /* Skip lines that are too long. */
537 if (strchr(p, '\n') == NULL) {
538 while ((ch = getc(hostf)) != '\n' && ch != EOF);
539 continue;
540 }
541 if (*p == '\n' || *p == '#') {
542 /* comment... */
543 continue;
544 }
545 while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
546 *p = isupper((unsigned char)*p) ? tolower((unsigned char)*p) : *p;
547 p++;
548 }
549 if (*p == ' ' || *p == '\t') {
550 *p++ = '\0';
551 while (*p == ' ' || *p == '\t')
552 p++;
553 user = p;
554 while (*p != '\n' && *p != ' ' &&
555 *p != '\t' && *p != '\0')
556 p++;
557 } else
558 user = p;
559 *p = '\0';
560 /*
561 * Do +/- and +@/-@ checking. This looks really nasty,
562 * but it matches SunOS's behavior so far as I can tell.
563 */
564 switch(buf[0]) {
565 case '+':
566 if (!buf[1]) { /* '+' matches all hosts */
567 hostok = 1;
568 break;
569 }
570 if (buf[1] == '@') /* match a host by netgroup */
571 hostok = innetgr((char *)&buf[2],
572 (char *)&hname, NULL, ypdomain);
573 else /* match a host by addr */
574 hostok = __icheckhost(raddr,(char *)&buf[1],
575 af, len);
576 break;
577 case '-': /* reject '-' hosts and all their users */
578 if (buf[1] == '@') {
579 if (innetgr((char *)&buf[2],
580 (char *)&hname, NULL, ypdomain))
581 return(-1);
582 } else {
583 if (__icheckhost(raddr,(char *)&buf[1],af,len))
584 return(-1);
585 }
586 break;
587 default: /* if no '+' or '-', do a simple match */
588 hostok = __icheckhost(raddr, buf, af, len);
589 break;
590 }
591 switch(*user) {
592 case '+':
593 if (!*(user+1)) { /* '+' matches all users */
594 userok = 1;
595 break;
596 }
597 if (*(user+1) == '@') /* match a user by netgroup */
598 userok = innetgr(user+2, NULL, ruser, ypdomain);
599 else /* match a user by direct specification */
600 userok = !(strcmp(ruser, user+1));
601 break;
602 case '-': /* if we matched a hostname, */
603 if (hostok) { /* check for user field rejections */
604 if (!*(user+1))
605 return(-1);
606 if (*(user+1) == '@') {
607 if (innetgr(user+2, NULL,
608 ruser, ypdomain))
609 return(-1);
610 } else {
611 if (!strcmp(ruser, user+1))
612 return(-1);
613 }
614 }
615 break;
616 default: /* no rejections: try to match the user */
617 if (hostok)
618 userok = !(strcmp(ruser,*user ? user : luser));
619 break;
620 }
621 if (hostok && userok)
622 return(0);
623 }
624 return (-1);
625}
626
627/*
628 * Returns "true" if match, 0 if no match.
629 */
630static int
631__icheckhost(raddr, lhost, af, len)
632 void *raddr;
633 register char *lhost;
634 int af, len;
635{
636 register struct hostent *hp;
637 char laddr[BUFSIZ]; /* xxx */
638 register char **pp;
639 int h_error;
640 int match;
641
642 /* Try for raw ip address first. */
643 if (inet_pton(af, lhost, laddr) == 1) {
644 if (memcmp(raddr, laddr, len) == 0)
645 return (1);
646 else
647 return (0);
648 }
649
650 /* Better be a hostname. */
651 if ((hp = getipnodebyname(lhost, af, AI_DEFAULT, &h_error)) == NULL)
652 return (0);
653
654 /* Spin through ip addresses. */
655 match = 0;
656 for (pp = hp->h_addr_list; *pp; ++pp)
657 if (!bcmp(raddr, *pp, len)) {
658 match = 1;
659 break;
660 }
661
662 freehostent(hp);
663 return (match);
664}
|