res_init.c revision 156956
1/*
2 * Copyright (c) 1985, 1989, 1993
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
34/*
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
36 *
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * SOFTWARE.
52 */
53
54/*
55 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
56 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
57 *
58 * Permission to use, copy, modify, and distribute this software for any
59 * purpose with or without fee is hereby granted, provided that the above
60 * copyright notice and this permission notice appear in all copies.
61 *
62 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
63 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
64 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
65 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
66 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
67 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
68 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
69 */
70
71#if defined(LIBC_SCCS) && !defined(lint)
72static const char sccsid[] = "@(#)res_init.c	8.1 (Berkeley) 6/7/93";
73static const char rcsid[] = "$Id: res_init.c,v 1.9.2.5.4.5 2005/11/03 00:00:52 marka Exp $";
74#endif /* LIBC_SCCS and not lint */
75#include <sys/cdefs.h>
76__FBSDID("$FreeBSD: head/lib/libc/resolv/res_init.c 156956 2006-03-21 15:37:16Z ume $");
77
78#include "port_before.h"
79
80#include <sys/types.h>
81#include <sys/param.h>
82#include <sys/socket.h>
83#include <sys/time.h>
84
85#include <netinet/in.h>
86#include <arpa/inet.h>
87#include <arpa/nameser.h>
88
89#include <ctype.h>
90#include <stdio.h>
91#include <stdlib.h>
92#include <string.h>
93#include <unistd.h>
94#include <netdb.h>
95
96#include "port_after.h"
97
98/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
99#include <resolv.h>
100
101#include "res_private.h"
102
103/* Options.  Should all be left alone. */
104#define RESOLVSORT
105#define DEBUG
106
107#ifdef SOLARIS2
108#include <sys/systeminfo.h>
109#endif
110
111static void res_setoptions(res_state, const char *, const char *);
112
113#ifdef RESOLVSORT
114static const char sort_mask[] = "/&";
115#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
116static u_int32_t net_mask(struct in_addr);
117#endif
118
119#if !defined(isascii)	/* XXX - could be a function */
120# define isascii(c) (!(c & 0200))
121#endif
122
123/*
124 * Resolver state default settings.
125 */
126
127/*
128 * Set up default settings.  If the configuration file exist, the values
129 * there will have precedence.  Otherwise, the server address is set to
130 * INADDR_ANY and the default domain name comes from the gethostname().
131 *
132 * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
133 * rather than INADDR_ANY ("0.0.0.0") as the default name server address
134 * since it was noted that INADDR_ANY actually meant ``the first interface
135 * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
136 * it had to be "up" in order for you to reach your own name server.  It
137 * was later decided that since the recommended practice is to always
138 * install local static routes through 127.0.0.1 for all your network
139 * interfaces, that we could solve this problem without a code change.
140 *
141 * The configuration file should always be used, since it is the only way
142 * to specify a default domain.  If you are running a server on your local
143 * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
144 * in the configuration file.
145 *
146 * Return 0 if completes successfully, -1 on error
147 */
148int
149res_ninit(res_state statp) {
150	extern int __res_vinit(res_state, int);
151
152	return (__res_vinit(statp, 0));
153}
154
155/* This function has to be reachable by res_data.c but not publically. */
156int
157__res_vinit(res_state statp, int preinit) {
158	FILE *fp;
159	char *cp, **pp;
160	int n;
161	char buf[BUFSIZ];
162	int nserv = 0;    /* number of nameserver records read from file */
163	int haveenv = 0;
164	int havesearch = 0;
165#ifdef RESOLVSORT
166	int nsort = 0;
167	char *net;
168#endif
169	int dots;
170	union res_sockaddr_union u[2];
171
172	if (statp->_u._ext.ext != NULL)
173		res_ndestroy(statp);
174
175	if (!preinit) {
176		statp->retrans = RES_TIMEOUT;
177		statp->retry = RES_DFLRETRY;
178		statp->options = RES_DEFAULT;
179		statp->id = res_randomid();
180	}
181
182	memset(u, 0, sizeof(u));
183#ifdef USELOOPBACK
184	u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
185#else
186	u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
187#endif
188	u[nserv].sin.sin_family = AF_INET;
189	u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
190#ifdef HAVE_SA_LEN
191	u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
192#endif
193	nserv++;
194#ifdef HAS_INET6_STRUCTS
195#ifdef USELOOPBACK
196	u[nserv].sin6.sin6_addr = in6addr_loopback;
197#else
198	u[nserv].sin6.sin6_addr = in6addr_any;
199#endif
200	u[nserv].sin6.sin6_family = AF_INET6;
201	u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
202#ifdef HAVE_SA_LEN
203	u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
204#endif
205	nserv++;
206#endif
207	statp->nscount = 0;
208	statp->ndots = 1;
209	statp->pfcode = 0;
210	statp->_vcsock = -1;
211	statp->_flags = 0;
212	statp->qhook = NULL;
213	statp->rhook = NULL;
214	statp->_u._ext.nscount = 0;
215	statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
216	if (statp->_u._ext.ext != NULL) {
217	        memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
218		statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
219		strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
220		strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
221	} else
222		return (-1);
223#ifdef RESOLVSORT
224	statp->nsort = 0;
225#endif
226	res_setservers(statp, u, nserv);
227
228#ifdef	SOLARIS2
229	/*
230	 * The old libresolv derived the defaultdomain from NIS/NIS+.
231	 * We want to keep this behaviour
232	 */
233	{
234		char buf[sizeof(statp->defdname)], *cp;
235		int ret;
236
237		if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
238			(unsigned int)ret <= sizeof(buf)) {
239			if (buf[0] == '+')
240				buf[0] = '.';
241			cp = strchr(buf, '.');
242			if (cp == NULL) {
243				if (strlcpy(statp->defdname, buf,
244					sizeof(statp->defdname))
245					>= sizeof(statp->defdname))
246					goto freedata;
247			} else {
248				if (strlcpy(statp->defdname, cp+1,
249					sizeof(statp->defdname))
250					 >= sizeof(statp->defdname))
251					goto freedata;
252			}
253		}
254	}
255#endif	/* SOLARIS2 */
256
257	/* Allow user to override the local domain definition */
258	if (issetugid() == 0 && (cp = getenv("LOCALDOMAIN")) != NULL) {
259		(void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
260		statp->defdname[sizeof(statp->defdname) - 1] = '\0';
261		haveenv++;
262
263		/*
264		 * Set search list to be blank-separated strings
265		 * from rest of env value.  Permits users of LOCALDOMAIN
266		 * to still have a search list, and anyone to set the
267		 * one that they want to use as an individual (even more
268		 * important now that the rfc1535 stuff restricts searches)
269		 */
270		cp = statp->defdname;
271		pp = statp->dnsrch;
272		*pp++ = cp;
273		for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
274			if (*cp == '\n')	/* silly backwards compat */
275				break;
276			else if (*cp == ' ' || *cp == '\t') {
277				*cp = 0;
278				n = 1;
279			} else if (n) {
280				*pp++ = cp;
281				n = 0;
282				havesearch = 1;
283			}
284		}
285		/* null terminate last domain if there are excess */
286		while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
287			cp++;
288		*cp = '\0';
289		*pp++ = 0;
290	}
291
292#define	MATCH(line, name) \
293	(!strncmp(line, name, sizeof(name) - 1) && \
294	(line[sizeof(name) - 1] == ' ' || \
295	 line[sizeof(name) - 1] == '\t'))
296
297	nserv = 0;
298	if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
299	    /* read the config file */
300	    while (fgets(buf, sizeof(buf), fp) != NULL) {
301		/* skip comments */
302		if (*buf == ';' || *buf == '#')
303			continue;
304		/* read default domain name */
305		if (MATCH(buf, "domain")) {
306		    if (haveenv)	/* skip if have from environ */
307			    continue;
308		    cp = buf + sizeof("domain") - 1;
309		    while (*cp == ' ' || *cp == '\t')
310			    cp++;
311		    if ((*cp == '\0') || (*cp == '\n'))
312			    continue;
313		    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
314		    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
315		    if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
316			    *cp = '\0';
317		    havesearch = 0;
318		    continue;
319		}
320		/* set search list */
321		if (MATCH(buf, "search")) {
322		    if (haveenv)	/* skip if have from environ */
323			    continue;
324		    cp = buf + sizeof("search") - 1;
325		    while (*cp == ' ' || *cp == '\t')
326			    cp++;
327		    if ((*cp == '\0') || (*cp == '\n'))
328			    continue;
329		    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
330		    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
331		    if ((cp = strchr(statp->defdname, '\n')) != NULL)
332			    *cp = '\0';
333		    /*
334		     * Set search list to be blank-separated strings
335		     * on rest of line.
336		     */
337		    cp = statp->defdname;
338		    pp = statp->dnsrch;
339		    *pp++ = cp;
340		    for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
341			    if (*cp == ' ' || *cp == '\t') {
342				    *cp = 0;
343				    n = 1;
344			    } else if (n) {
345				    *pp++ = cp;
346				    n = 0;
347			    }
348		    }
349		    /* null terminate last domain if there are excess */
350		    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
351			    cp++;
352		    *cp = '\0';
353		    *pp++ = 0;
354		    havesearch = 1;
355		    continue;
356		}
357		/* read nameservers to query */
358		if (MATCH(buf, "nameserver") && nserv < MAXNS) {
359		    struct addrinfo hints, *ai;
360		    char sbuf[NI_MAXSERV];
361		    const size_t minsiz =
362		        sizeof(statp->_u._ext.ext->nsaddrs[0]);
363
364		    cp = buf + sizeof("nameserver") - 1;
365		    while (*cp == ' ' || *cp == '\t')
366			cp++;
367		    cp[strcspn(cp, ";# \t\n")] = '\0';
368		    if ((*cp != '\0') && (*cp != '\n')) {
369			memset(&hints, 0, sizeof(hints));
370			hints.ai_family = PF_UNSPEC;
371			hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
372			hints.ai_flags = AI_NUMERICHOST;
373			sprintf(sbuf, "%u", NAMESERVER_PORT);
374			if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
375			    ai->ai_addrlen <= minsiz) {
376			    if (statp->_u._ext.ext != NULL) {
377				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
378				    ai->ai_addr, ai->ai_addrlen);
379			    }
380			    if (ai->ai_addrlen <=
381			        sizeof(statp->nsaddr_list[nserv])) {
382				memcpy(&statp->nsaddr_list[nserv],
383				    ai->ai_addr, ai->ai_addrlen);
384			    } else
385				statp->nsaddr_list[nserv].sin_family = 0;
386			    freeaddrinfo(ai);
387			    nserv++;
388			}
389		    }
390		    continue;
391		}
392#ifdef RESOLVSORT
393		if (MATCH(buf, "sortlist")) {
394		    struct in_addr a;
395		    struct in6_addr a6;
396		    int m, i;
397		    u_char *u;
398		    struct __res_state_ext *ext = statp->_u._ext.ext;
399
400		    cp = buf + sizeof("sortlist") - 1;
401		    while (nsort < MAXRESOLVSORT) {
402			while (*cp == ' ' || *cp == '\t')
403			    cp++;
404			if (*cp == '\0' || *cp == '\n' || *cp == ';')
405			    break;
406			net = cp;
407			while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
408			       isascii(*cp) && !isspace((unsigned char)*cp))
409				cp++;
410			n = *cp;
411			*cp = 0;
412			if (inet_aton(net, &a)) {
413			    statp->sort_list[nsort].addr = a;
414			    if (ISSORTMASK(n)) {
415				*cp++ = n;
416				net = cp;
417				while (*cp && *cp != ';' &&
418					isascii(*cp) &&
419					!isspace((unsigned char)*cp))
420				    cp++;
421				n = *cp;
422				*cp = 0;
423				if (inet_aton(net, &a)) {
424				    statp->sort_list[nsort].mask = a.s_addr;
425				} else {
426				    statp->sort_list[nsort].mask =
427					net_mask(statp->sort_list[nsort].addr);
428				}
429			    } else {
430				statp->sort_list[nsort].mask =
431				    net_mask(statp->sort_list[nsort].addr);
432			    }
433			    ext->sort_list[nsort].af = AF_INET;
434			    ext->sort_list[nsort].addr.ina =
435				statp->sort_list[nsort].addr;
436			    ext->sort_list[nsort].mask.ina.s_addr =
437				statp->sort_list[nsort].mask;
438			    nsort++;
439			}
440			else if (inet_pton(AF_INET6, net, &a6) == 1) {
441
442			    ext->sort_list[nsort].af = AF_INET6;
443			    ext->sort_list[nsort].addr.in6a = a6;
444			    u = (u_char *)&ext->sort_list[nsort].mask.in6a;
445			    *cp++ = n;
446			    net = cp;
447			    while (*cp && *cp != ';' &&
448				    isascii(*cp) && !isspace(*cp))
449				cp++;
450			    m = n;
451			    n = *cp;
452			    *cp = 0;
453			    switch (m) {
454			    case '/':
455				m = atoi(net);
456				break;
457			    case '&':
458				if (inet_pton(AF_INET6, net, u) == 1) {
459				    m = -1;
460				    break;
461				}
462				/*FALLTHROUGH*/
463			    default:
464				m = sizeof(struct in6_addr) * CHAR_BIT;
465				break;
466			    }
467			    if (m >= 0) {
468				for (i = 0; i < sizeof(struct in6_addr); i++) {
469				    if (m <= 0) {
470					*u = 0;
471				    } else {
472					m -= CHAR_BIT;
473					*u = (u_char)~0;
474					if (m < 0)
475					    *u <<= -m;
476				    }
477				    u++;
478				}
479			    }
480			    statp->sort_list[nsort].addr.s_addr =
481				(u_int32_t)0xffffffff;
482			    statp->sort_list[nsort].mask =
483				(u_int32_t)0xffffffff;
484			    nsort++;
485			}
486			*cp = n;
487		    }
488		    continue;
489		}
490#endif
491		if (MATCH(buf, "options")) {
492		    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
493		    continue;
494		}
495	    }
496	    if (nserv > 0)
497		statp->nscount = nserv;
498#ifdef RESOLVSORT
499	    statp->nsort = nsort;
500#endif
501	    (void) fclose(fp);
502	}
503/*
504 * Last chance to get a nameserver.  This should not normally
505 * be necessary
506 */
507#ifdef NO_RESOLV_CONF
508	if(nserv == 0)
509		nserv = get_nameservers(statp);
510#endif
511
512	if (statp->defdname[0] == 0 &&
513	    gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
514	    (cp = strchr(buf, '.')) != NULL)
515		strcpy(statp->defdname, cp + 1);
516
517	/* find components of local domain that might be searched */
518	if (havesearch == 0) {
519		pp = statp->dnsrch;
520		*pp++ = statp->defdname;
521		*pp = NULL;
522
523		dots = 0;
524		for (cp = statp->defdname; *cp; cp++)
525			dots += (*cp == '.');
526
527		cp = statp->defdname;
528		while (pp < statp->dnsrch + MAXDFLSRCH) {
529			if (dots < LOCALDOMAINPARTS)
530				break;
531			cp = strchr(cp, '.') + 1;    /* we know there is one */
532			*pp++ = cp;
533			dots--;
534		}
535		*pp = NULL;
536#ifdef DEBUG
537		if (statp->options & RES_DEBUG) {
538			printf(";; res_init()... default dnsrch list:\n");
539			for (pp = statp->dnsrch; *pp; pp++)
540				printf(";;\t%s\n", *pp);
541			printf(";;\t..END..\n");
542		}
543#endif
544	}
545
546	if (issetugid())
547		statp->options |= RES_NOALIASES;
548	else if ((cp = getenv("RES_OPTIONS")) != NULL)
549		res_setoptions(statp, cp, "env");
550	statp->options |= RES_INIT;
551	return (0);
552
553#ifdef	SOLARIS2
554 freedata:
555	if (statp->_u._ext.ext != NULL) {
556		free(statp->_u._ext.ext);
557		statp->_u._ext.ext = NULL;
558	}
559	return (-1);
560#endif
561}
562
563static void
564res_setoptions(res_state statp, const char *options, const char *source)
565{
566	const char *cp = options;
567	int i;
568#ifndef _LIBC
569	struct __res_state_ext *ext = statp->_u._ext.ext;
570#endif
571
572#ifdef DEBUG
573	if (statp->options & RES_DEBUG)
574		printf(";; res_setoptions(\"%s\", \"%s\")...\n",
575		       options, source);
576#endif
577	while (*cp) {
578		/* skip leading and inner runs of spaces */
579		while (*cp == ' ' || *cp == '\t')
580			cp++;
581		/* search for and process individual options */
582		if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
583			i = atoi(cp + sizeof("ndots:") - 1);
584			if (i <= RES_MAXNDOTS)
585				statp->ndots = i;
586			else
587				statp->ndots = RES_MAXNDOTS;
588#ifdef DEBUG
589			if (statp->options & RES_DEBUG)
590				printf(";;\tndots=%d\n", statp->ndots);
591#endif
592		} else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
593			i = atoi(cp + sizeof("timeout:") - 1);
594			if (i <= RES_MAXRETRANS)
595				statp->retrans = i;
596			else
597				statp->retrans = RES_MAXRETRANS;
598#ifdef DEBUG
599			if (statp->options & RES_DEBUG)
600				printf(";;\ttimeout=%d\n", statp->retrans);
601#endif
602#ifdef	SOLARIS2
603		} else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
604			/*
605		 	 * For backward compatibility, 'retrans' is
606		 	 * supported as an alias for 'timeout', though
607		 	 * without an imposed maximum.
608		 	 */
609			statp->retrans = atoi(cp + sizeof("retrans:") - 1);
610		} else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
611			/*
612			 * For backward compatibility, 'retry' is
613			 * supported as an alias for 'attempts', though
614			 * without an imposed maximum.
615			 */
616			statp->retry = atoi(cp + sizeof("retry:") - 1);
617#endif	/* SOLARIS2 */
618		} else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
619			i = atoi(cp + sizeof("attempts:") - 1);
620			if (i <= RES_MAXRETRY)
621				statp->retry = i;
622			else
623				statp->retry = RES_MAXRETRY;
624#ifdef DEBUG
625			if (statp->options & RES_DEBUG)
626				printf(";;\tattempts=%d\n", statp->retry);
627#endif
628		} else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
629#ifdef DEBUG
630			if (!(statp->options & RES_DEBUG)) {
631				printf(";; res_setoptions(\"%s\", \"%s\")..\n",
632				       options, source);
633				statp->options |= RES_DEBUG;
634			}
635			printf(";;\tdebug\n");
636#endif
637		} else if (!strncmp(cp, "no_tld_query",
638				    sizeof("no_tld_query") - 1) ||
639			   !strncmp(cp, "no-tld-query",
640				    sizeof("no-tld-query") - 1)) {
641			statp->options |= RES_NOTLDQUERY;
642		} else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
643			statp->options |= RES_USE_INET6;
644		} else if (!strncmp(cp, "insecure1", sizeof("insecure1") - 1)) {
645		       statp->options |= RES_INSECURE1;
646		} else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
647		       statp->options |= RES_INSECURE2;
648		} else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
649			statp->options |= RES_ROTATE;
650		} else if (!strncmp(cp, "no-check-names",
651				    sizeof("no-check-names") - 1)) {
652			statp->options |= RES_NOCHECKNAME;
653		}
654#ifdef RES_USE_EDNS0
655		else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
656			statp->options |= RES_USE_EDNS0;
657		}
658#endif
659#ifndef _LIBC
660		else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
661			statp->options |= RES_USE_DNAME;
662		}
663		else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
664			if (ext == NULL)
665				goto skip;
666			cp += sizeof("nibble:") - 1;
667			i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
668			strncpy(ext->nsuffix, cp, i);
669			ext->nsuffix[i] = '\0';
670		}
671		else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
672			if (ext == NULL)
673				goto skip;
674			cp += sizeof("nibble2:") - 1;
675			i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
676			strncpy(ext->nsuffix2, cp, i);
677			ext->nsuffix2[i] = '\0';
678		}
679		else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
680			cp += sizeof("v6revmode:") - 1;
681			/* "nibble" and "bitstring" used to be valid */
682			if (!strncmp(cp, "single", sizeof("single") - 1)) {
683				statp->options |= RES_NO_NIBBLE2;
684			} else if (!strncmp(cp, "both", sizeof("both") - 1)) {
685				statp->options &=
686					 ~RES_NO_NIBBLE2;
687			}
688		}
689#endif
690		else {
691			/* XXX - print a warning here? */
692		}
693#ifndef _LIBC
694   skip:
695#endif
696		/* skip to next run of spaces */
697		while (*cp && *cp != ' ' && *cp != '\t')
698			cp++;
699	}
700}
701
702#ifdef RESOLVSORT
703/* XXX - should really support CIDR which means explicit masks always. */
704static u_int32_t
705net_mask(in)		/* XXX - should really use system's version of this */
706	struct in_addr in;
707{
708	u_int32_t i = ntohl(in.s_addr);
709
710	if (IN_CLASSA(i))
711		return (htonl(IN_CLASSA_NET));
712	else if (IN_CLASSB(i))
713		return (htonl(IN_CLASSB_NET));
714	return (htonl(IN_CLASSC_NET));
715}
716#endif
717
718u_int
719res_randomid(void) {
720	struct timeval now;
721
722	gettimeofday(&now, NULL);
723	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
724}
725
726/*
727 * This routine is for closing the socket if a virtual circuit is used and
728 * the program wants to close it.  This provides support for endhostent()
729 * which expects to close the socket.
730 *
731 * This routine is not expected to be user visible.
732 */
733void
734res_nclose(res_state statp) {
735	int ns;
736
737	if (statp->_vcsock >= 0) {
738		(void) close(statp->_vcsock);
739		statp->_vcsock = -1;
740		statp->_flags &= ~(RES_F_VC | RES_F_CONN);
741	}
742	for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
743		if (statp->_u._ext.nssocks[ns] != -1) {
744			(void) close(statp->_u._ext.nssocks[ns]);
745			statp->_u._ext.nssocks[ns] = -1;
746		}
747	}
748}
749
750void
751res_ndestroy(res_state statp) {
752	res_nclose(statp);
753	if (statp->_u._ext.ext != NULL)
754		free(statp->_u._ext.ext);
755	statp->options &= ~RES_INIT;
756	statp->_u._ext.ext = NULL;
757}
758
759#ifndef _LIBC
760const char *
761res_get_nibblesuffix(res_state statp) {
762	if (statp->_u._ext.ext)
763		return (statp->_u._ext.ext->nsuffix);
764	return ("ip6.arpa");
765}
766
767const char *
768res_get_nibblesuffix2(res_state statp) {
769	if (statp->_u._ext.ext)
770		return (statp->_u._ext.ext->nsuffix2);
771	return ("ip6.int");
772}
773#endif
774
775void
776res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
777	int i, nserv;
778	size_t size;
779
780	/* close open servers */
781	res_nclose(statp);
782
783	/* cause rtt times to be forgotten */
784	statp->_u._ext.nscount = 0;
785
786	nserv = 0;
787	for (i = 0; i < cnt && nserv < MAXNS; i++) {
788		switch (set->sin.sin_family) {
789		case AF_INET:
790			size = sizeof(set->sin);
791			if (statp->_u._ext.ext)
792				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
793					&set->sin, size);
794			if (size <= sizeof(statp->nsaddr_list[nserv]))
795				memcpy(&statp->nsaddr_list[nserv],
796					&set->sin, size);
797			else
798				statp->nsaddr_list[nserv].sin_family = 0;
799			nserv++;
800			break;
801
802#ifdef HAS_INET6_STRUCTS
803		case AF_INET6:
804			size = sizeof(set->sin6);
805			if (statp->_u._ext.ext)
806				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
807					&set->sin6, size);
808			if (size <= sizeof(statp->nsaddr_list[nserv]))
809				memcpy(&statp->nsaddr_list[nserv],
810					&set->sin6, size);
811			else
812				statp->nsaddr_list[nserv].sin_family = 0;
813			nserv++;
814			break;
815#endif
816
817		default:
818			break;
819		}
820		set++;
821	}
822	statp->nscount = nserv;
823
824}
825
826int
827res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
828	int i;
829	size_t size;
830	u_int16_t family;
831
832	for (i = 0; i < statp->nscount && i < cnt; i++) {
833		if (statp->_u._ext.ext)
834			family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
835		else
836			family = statp->nsaddr_list[i].sin_family;
837
838		switch (family) {
839		case AF_INET:
840			size = sizeof(set->sin);
841			if (statp->_u._ext.ext)
842				memcpy(&set->sin,
843				       &statp->_u._ext.ext->nsaddrs[i],
844				       size);
845			else
846				memcpy(&set->sin, &statp->nsaddr_list[i],
847				       size);
848			break;
849
850#ifdef HAS_INET6_STRUCTS
851		case AF_INET6:
852			size = sizeof(set->sin6);
853			if (statp->_u._ext.ext)
854				memcpy(&set->sin6,
855				       &statp->_u._ext.ext->nsaddrs[i],
856				       size);
857			else
858				memcpy(&set->sin6, &statp->nsaddr_list[i],
859				       size);
860			break;
861#endif
862
863		default:
864			set->sin.sin_family = 0;
865			break;
866		}
867		set++;
868	}
869	return (statp->nscount);
870}
871