michael@0: /*	$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $	*/
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 1985, 1989, 1993
michael@0:  *    The Regents of the University of California.  All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  * 1. Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  * 2. Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in the
michael@0:  *    documentation and/or other materials provided with the distribution.
michael@0:  * 3. All advertising materials mentioning features or use of this software
michael@0:  *    must display the following acknowledgement:
michael@0:  * 	This product includes software developed by the University of
michael@0:  * 	California, Berkeley and its contributors.
michael@0:  * 4. Neither the name of the University nor the names of its contributors
michael@0:  *    may be used to endorse or promote products derived from this software
michael@0:  *    without specific prior written permission.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
michael@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
michael@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
michael@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
michael@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
michael@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
michael@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
michael@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
michael@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
michael@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
michael@0:  * SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies, and that
michael@0:  * the name of Digital Equipment Corporation not be used in advertising or
michael@0:  * publicity pertaining to distribution of the document or software without
michael@0:  * specific, written prior permission.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
michael@0:  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
michael@0:  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
michael@0:  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
michael@0:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
michael@0:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
michael@0:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
michael@0:  * SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
michael@0:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
michael@0:  *
michael@0:  * Permission to use, copy, modify, and distribute this software for any
michael@0:  * purpose with or without fee is hereby granted, provided that the above
michael@0:  * copyright notice and this permission notice appear in all copies.
michael@0:  *
michael@0:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
michael@0:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
michael@0:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
michael@0:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
michael@0:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
michael@0:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
michael@0:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0:  * which contains uncredited changes by Android/Google developers.  It has
michael@0:  * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0:  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0:  * and Steve Workman <sjhworkman@gmail.com>).
michael@0:  * These changes are offered under the same license as the original NetBSD
michael@0:  * file, whose copyright and license are unchanged above.
michael@0:  */
michael@0: 
michael@0: #define ANDROID_CHANGES 1
michael@0: #define MOZILLE_NECKO_EXCLUDE_CODE 1
michael@0: 
michael@0: #include <sys/cdefs.h>
michael@0: #if defined(LIBC_SCCS) && !defined(lint)
michael@0: #ifdef notdef
michael@0: static const char sccsid[] = "@(#)res_init.c	8.1 (Berkeley) 6/7/93";
michael@0: static const char rcsid[] = "Id: res_init.c,v 1.9.2.5.4.2 2004/03/16 12:34:18 marka Exp";
michael@0: #else
michael@0: __RCSID("$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $");
michael@0: #endif
michael@0: #endif /* LIBC_SCCS and not lint */
michael@0: 
michael@0: 
michael@0: 
michael@0: #include <sys/types.h>
michael@0: #include <sys/param.h>
michael@0: #include <sys/socket.h>
michael@0: #include <sys/time.h>
michael@0: 
michael@0: #include <netinet/in.h>
michael@0: #include <arpa/inet.h>
michael@0: #include "arpa_nameser.h"
michael@0: 
michael@0: #include <ctype.h>
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <unistd.h>
michael@0: #include <netdb.h>
michael@0: 
michael@0: #ifdef ANDROID_CHANGES
michael@0: #include <sys/system_properties.h>
michael@0: #endif /* ANDROID_CHANGES */
michael@0: 
michael@0: #ifndef MIN
michael@0: #define	MIN(x,y)	((x)<(y)?(x):(y))
michael@0: #endif
michael@0: 
michael@0: /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
michael@0: #ifdef ANDROID_CHANGES
michael@0: #include "resolv_private.h"
michael@0: #define MAX_DNS_PROPERTIES 8
michael@0: #define DNS_PROP_NAME_PREFIX "net.dns"
michael@0: #define DNS_CHANGE_PROP_NAME "net.dnschange"
michael@0: #define DNS_SEARCH_PROP_NAME "net.dns.search"
michael@0: const prop_info *dns_change_prop;
michael@0: int dns_last_change_counter;
michael@0: static int _get_dns_change_count();
michael@0: #else
michael@0: #include <resolv.h>
michael@0: #endif
michael@0: 
michael@0: #include "res_private.h"
michael@0: 
michael@0: /* Options.  Should all be left alone. */
michael@0: #ifndef DEBUG
michael@0: #define DEBUG
michael@0: #endif
michael@0: 
michael@0: static void res_setoptions __P((res_state, const char *, const char *));
michael@0: 
michael@0: static const char sort_mask[] = "/&";
michael@0: #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
michael@0: static u_int32_t net_mask __P((struct in_addr));
michael@0: 
michael@0: #if !defined(isascii)	/* XXX - could be a function */
michael@0: # define isascii(c) (!(c & 0200))
michael@0: #endif
michael@0: 
michael@0: /*
michael@0:  * Resolver state default settings.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * Set up default settings.  If the configuration file exist, the values
michael@0:  * there will have precedence.  Otherwise, the server address is set to
michael@0:  * INADDR_ANY and the default domain name comes from the gethostname().
michael@0:  *
michael@0:  * An interrim version of this code (BIND 4.9, pre-4.4BSD) used 127.0.0.1
michael@0:  * rather than INADDR_ANY ("0.0.0.0") as the default name server address
michael@0:  * since it was noted that INADDR_ANY actually meant ``the first interface
michael@0:  * you "ifconfig"'d at boot time'' and if this was a SLIP or PPP interface,
michael@0:  * it had to be "up" in order for you to reach your own name server.  It
michael@0:  * was later decided that since the recommended practice is to always
michael@0:  * install local static routes through 127.0.0.1 for all your network
michael@0:  * interfaces, that we could solve this problem without a code change.
michael@0:  *
michael@0:  * The configuration file should always be used, since it is the only way
michael@0:  * to specify a default domain.  If you are running a server on your local
michael@0:  * machine, you should say "nameserver 0.0.0.0" or "nameserver 127.0.0.1"
michael@0:  * in the configuration file.
michael@0:  *
michael@0:  * Return 0 if completes successfully, -1 on error
michael@0:  */
michael@0: int
michael@0: res_ninit(res_state statp) {
michael@0: 	extern int __res_vinit(res_state, int);
michael@0: 
michael@0: 	return (__res_vinit(statp, 0));
michael@0: }
michael@0: 
michael@0: #ifdef ANDROID_CHANGES
michael@0: int load_domain_search_list(res_state statp) {
michael@0: 	char propvalue[PROP_VALUE_MAX];
michael@0: 	register char *cp, **pp;
michael@0: 
michael@0: 	if(__system_property_get(DNS_SEARCH_PROP_NAME, propvalue) >= 1) {
michael@0: 		strlcpy(statp->defdname, propvalue, sizeof(statp->defdname));
michael@0: 		if ((cp = strchr(statp->defdname, '\n')) != NULL)
michael@0: 			*cp = '\0';
michael@0: 		cp = statp->defdname;
michael@0: 		pp = statp->dnsrch;
michael@0: 		while ( pp < statp->dnsrch + MAXDNSRCH ) {
michael@0: 			while (*cp == ' ' || *cp == '\t') /* skip leading white space */
michael@0: 				cp++;
michael@0: 			if (*cp == '\0')  /* stop if nothing more */
michael@0: 				break;
michael@0: 			*pp++ = cp;  /* record this search domain */
michael@0: 			while (*cp) { /* zero-terminate it */
michael@0: 				if (*cp == ' ' || *cp == '\t') {
michael@0: 					*cp++ = '\0';
michael@0: 					break;
michael@0: 				}
michael@0: 				cp++;
michael@0: 			}
michael@0: 		}
michael@0: 		*pp = NULL; /* statp->dnsrch has MAXDNSRCH+1 items */
michael@0: 		if (pp > statp->dnsrch)
michael@0: 			return 1;
michael@0: 	}
michael@0: 	statp->defdname[0] = '\0';  /* no default domain name on Android */
michael@0: 	statp->dnsrch[0] = NULL;
michael@0: 	return 0;
michael@0: }
michael@0: #endif
michael@0: 
michael@0: /* This function has to be reachable by res_data.c but not publicly. */
michael@0: int
michael@0: __res_vinit(res_state statp, int preinit) {
michael@0: 	register FILE *fp;
michael@0: 	register char *cp, **pp;
michael@0: 	register int n;
michael@0: 	char buf[BUFSIZ];
michael@0: 	int nserv = 0;    /* number of nameserver records read from file */
michael@0: 	int haveenv = 0;
michael@0: 	int havesearch = 0;
michael@0: 	int nsort = 0;
michael@0: 	char *net;
michael@0: 	int dots;
michael@0: 	union res_sockaddr_union u[2];
michael@0: #ifdef ANDROID_CHANGES
michael@0:         pid_t mypid = getpid();
michael@0:         int use_proc_props = 0;
michael@0:         int found_prop;
michael@0: 	char dnsProperty[PROP_VALUE_MAX];
michael@0: #endif
michael@0: 
michael@0: 	if (!preinit) {
michael@0: 		statp->retrans = RES_TIMEOUT;
michael@0: 		statp->retry = RES_DFLRETRY;
michael@0: 		statp->options = RES_DEFAULT;
michael@0: 		statp->id = res_randomid();
michael@0: 	}
michael@0: 
michael@0:   if ((statp->options & RES_INIT) != 0U)
michael@0:        res_ndestroy(statp);
michael@0: 
michael@0: 	memset(u, 0, sizeof(u));
michael@0: #ifdef USELOOPBACK
michael@0: 	u[nserv].sin.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1);
michael@0: #else
michael@0: 	u[nserv].sin.sin_addr.s_addr = INADDR_ANY;
michael@0: #endif
michael@0: 	u[nserv].sin.sin_family = AF_INET;
michael@0: 	u[nserv].sin.sin_port = htons(NAMESERVER_PORT);
michael@0: #ifdef HAVE_SA_LEN
michael@0: 	u[nserv].sin.sin_len = sizeof(struct sockaddr_in);
michael@0: #endif
michael@0: 	nserv++;
michael@0: #ifdef HAS_INET6_STRUCTS
michael@0: #ifdef USELOOPBACK
michael@0: 	u[nserv].sin6.sin6_addr = in6addr_loopback;
michael@0: #else
michael@0: 	u[nserv].sin6.sin6_addr = in6addr_any;
michael@0: #endif
michael@0: 	u[nserv].sin6.sin6_family = AF_INET6;
michael@0: 	u[nserv].sin6.sin6_port = htons(NAMESERVER_PORT);
michael@0: #ifdef HAVE_SA_LEN
michael@0: 	u[nserv].sin6.sin6_len = sizeof(struct sockaddr_in6);
michael@0: #endif
michael@0: 	nserv++;
michael@0: #endif
michael@0: 	statp->nscount = 0;
michael@0: 	statp->ndots = 1;
michael@0: 	statp->pfcode = 0;
michael@0: 	statp->_vcsock = -1;
michael@0: 	statp->_flags = 0;
michael@0: 	statp->qhook = NULL;
michael@0: 	statp->rhook = NULL;
michael@0: 	statp->_u._ext.nscount = 0;
michael@0: 	statp->_u._ext.ext = malloc(sizeof(*statp->_u._ext.ext));
michael@0: 	if (statp->_u._ext.ext != NULL) {
michael@0: 	        memset(statp->_u._ext.ext, 0, sizeof(*statp->_u._ext.ext));
michael@0: 		statp->_u._ext.ext->nsaddrs[0].sin = statp->nsaddr;
michael@0: 		strcpy(statp->_u._ext.ext->nsuffix, "ip6.arpa");
michael@0: 		strcpy(statp->_u._ext.ext->nsuffix2, "ip6.int");
michael@0: 	}
michael@0: 	statp->nsort = 0;
michael@0: 	res_setservers(statp, u, nserv);
michael@0: 
michael@0: #if 0 /* IGNORE THE ENVIRONMENT */
michael@0: 	/* Allow user to override the local domain definition */
michael@0: 	if ((cp = getenv("LOCALDOMAIN")) != NULL) {
michael@0: 		(void)strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
michael@0: 		statp->defdname[sizeof(statp->defdname) - 1] = '\0';
michael@0: 		haveenv++;
michael@0: 
michael@0: 		/*
michael@0: 		 * Set search list to be blank-separated strings
michael@0: 		 * from rest of env value.  Permits users of LOCALDOMAIN
michael@0: 		 * to still have a search list, and anyone to set the
michael@0: 		 * one that they want to use as an individual (even more
michael@0: 		 * important now that the rfc1535 stuff restricts searches)
michael@0: 		 */
michael@0: 		cp = statp->defdname;
michael@0: 		pp = statp->dnsrch;
michael@0: 		*pp++ = cp;
michael@0: 		for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
michael@0: 			if (*cp == '\n')	/* silly backwards compat */
michael@0: 				break;
michael@0: 			else if (*cp == ' ' || *cp == '\t') {
michael@0: 				*cp = 0;
michael@0: 				n = 1;
michael@0: 			} else if (n) {
michael@0: 				*pp++ = cp;
michael@0: 				n = 0;
michael@0: 				havesearch = 1;
michael@0: 			}
michael@0: 		}
michael@0: 		/* null terminate last domain if there are excess */
michael@0: 		while (*cp != '\0' && *cp != ' ' && *cp != '\t' && *cp != '\n')
michael@0: 			cp++;
michael@0: 		*cp = '\0';
michael@0: 		*pp++ = 0;
michael@0: 	}
michael@0: 	if (nserv > 0)
michael@0: 		statp->nscount = nserv;
michael@0: #endif
michael@0: #ifdef ANDROID_CHANGES /* READ FROM SYSTEM PROPERTIES */
michael@0: 	dns_last_change_counter = _get_dns_change_count();
michael@0: 
michael@0: 	nserv = 0;
michael@0: 	for(n = 1; n <= MAX_DNS_PROPERTIES && nserv < MAXNS; n++) {
michael@0: 		char propname[PROP_NAME_MAX];
michael@0: 		char propvalue[PROP_VALUE_MAX];
michael@0: 
michael@0: 		struct addrinfo hints, *ai;
michael@0: 		char sbuf[NI_MAXSERV];
michael@0: 		const size_t minsiz = sizeof(statp->_u._ext.ext->nsaddrs[0]);
michael@0: 
michael@0: 		/*
michael@0: 		 * Check first for process-specific properties, and if those don't
michael@0: 		 * exist, try the generic properties.
michael@0: 		 */
michael@0: 		found_prop = 0;
michael@0: 		if (n == 1 || use_proc_props) {
michael@0: 			snprintf(propname, sizeof(propname), "%s%d.%d", DNS_PROP_NAME_PREFIX, n, mypid);
michael@0: 			if(__system_property_get(propname, propvalue) < 1) {
michael@0: 				if (use_proc_props) {
michael@0: 					break;
michael@0: 				}
michael@0: 			} else {
michael@0: 				found_prop = 1;
michael@0: 				use_proc_props = 1;
michael@0: 			}
michael@0: 		}
michael@0: 		if (!found_prop) {
michael@0: 			snprintf(propname, sizeof(propname), "%s%d", DNS_PROP_NAME_PREFIX, n);
michael@0: 			if(__system_property_get(propname, propvalue) < 1) {
michael@0: 				break;
michael@0: 			}
michael@0: 		}
michael@0: 
michael@0: 		cp = propvalue;
michael@0: 
michael@0: 		while (*cp == ' ' || *cp == '\t')
michael@0: 			cp++;
michael@0: 		cp[strcspn(cp, ";# \t\n")] = '\0';
michael@0: 		if ((*cp != '\0') && (*cp != '\n')) {
michael@0: 			memset(&hints, 0, sizeof(hints));
michael@0: 			hints.ai_family = PF_UNSPEC;
michael@0: 			hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
michael@0: 			hints.ai_flags = AI_NUMERICHOST;
michael@0: 			sprintf(sbuf, "%u", NAMESERVER_PORT);
michael@0: 			if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
michael@0: 			    (size_t)ai->ai_addrlen <= minsiz) {
michael@0: 				if (statp->_u._ext.ext != NULL) {
michael@0: 					memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
michael@0: 					       ai->ai_addr, ai->ai_addrlen);
michael@0: 				}
michael@0: 				if ((size_t)ai->ai_addrlen <=
michael@0: 				    sizeof(statp->nsaddr_list[nserv])) {
michael@0: 					memcpy(&statp->nsaddr_list[nserv],
michael@0: 					       ai->ai_addr, ai->ai_addrlen);
michael@0: 				} else {
michael@0: 					statp->nsaddr_list[nserv].sin_family = 0;
michael@0: 				}
michael@0: 				freeaddrinfo(ai);
michael@0: 				nserv++;
michael@0: 			}
michael@0: 		}
michael@0: 	}
michael@0: 
michael@0: 	/* Add the domain search list */
michael@0: 	havesearch = load_domain_search_list(statp);
michael@0: #else /* !ANDROID_CHANGES - IGNORE resolv.conf in Android */
michael@0: #define	MATCH(line, name) \
michael@0: 	(!strncmp(line, name, sizeof(name) - 1) && \
michael@0: 	(line[sizeof(name) - 1] == ' ' || \
michael@0: 	 line[sizeof(name) - 1] == '\t'))
michael@0: 
michael@0: 	nserv = 0;
michael@0: 	if ((fp = fopen(_PATH_RESCONF, "r")) != NULL) {
michael@0: 	    /* read the config file */
michael@0: 	    while (fgets(buf, sizeof(buf), fp) != NULL) {
michael@0: 		/* skip comments */
michael@0: 		if (*buf == ';' || *buf == '#')
michael@0: 			continue;
michael@0: 		/* read default domain name */
michael@0: 		if (MATCH(buf, "domain")) {
michael@0: 		    if (haveenv)	/* skip if have from environ */
michael@0: 			    continue;
michael@0: 		    cp = buf + sizeof("domain") - 1;
michael@0: 		    while (*cp == ' ' || *cp == '\t')
michael@0: 			    cp++;
michael@0: 		    if ((*cp == '\0') || (*cp == '\n'))
michael@0: 			    continue;
michael@0: 		    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
michael@0: 		    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
michael@0: 		    if ((cp = strpbrk(statp->defdname, " \t\n")) != NULL)
michael@0: 			    *cp = '\0';
michael@0: 		    havesearch = 0;
michael@0: 		    continue;
michael@0: 		}
michael@0: 		/* set search list */
michael@0: 		if (MATCH(buf, "search")) {
michael@0: 		    if (haveenv)	/* skip if have from environ */
michael@0: 			    continue;
michael@0: 		    cp = buf + sizeof("search") - 1;
michael@0: 		    while (*cp == ' ' || *cp == '\t')
michael@0: 			    cp++;
michael@0: 		    if ((*cp == '\0') || (*cp == '\n'))
michael@0: 			    continue;
michael@0: 		    strncpy(statp->defdname, cp, sizeof(statp->defdname) - 1);
michael@0: 		    statp->defdname[sizeof(statp->defdname) - 1] = '\0';
michael@0: 		    if ((cp = strchr(statp->defdname, '\n')) != NULL)
michael@0: 			    *cp = '\0';
michael@0: 		    /*
michael@0: 		     * Set search list to be blank-separated strings
michael@0: 		     * on rest of line.
michael@0: 		     */
michael@0: 		    cp = statp->defdname;
michael@0: 		    pp = statp->dnsrch;
michael@0: 		    *pp++ = cp;
michael@0: 		    for (n = 0; *cp && pp < statp->dnsrch + MAXDNSRCH; cp++) {
michael@0: 			    if (*cp == ' ' || *cp == '\t') {
michael@0: 				    *cp = 0;
michael@0: 				    n = 1;
michael@0: 			    } else if (n) {
michael@0: 				    *pp++ = cp;
michael@0: 				    n = 0;
michael@0: 			    }
michael@0: 		    }
michael@0: 		    /* null terminate last domain if there are excess */
michael@0: 		    while (*cp != '\0' && *cp != ' ' && *cp != '\t')
michael@0: 			    cp++;
michael@0: 		    *cp = '\0';
michael@0: 		    *pp++ = 0;
michael@0: 		    havesearch = 1;
michael@0: 		    continue;
michael@0: 		}
michael@0: 		/* read nameservers to query */
michael@0: 		if (MATCH(buf, "nameserver") && nserv < MAXNS) {
michael@0: 		    struct addrinfo hints, *ai;
michael@0: 		    char sbuf[NI_MAXSERV];
michael@0: 		    const size_t minsiz =
michael@0: 		        sizeof(statp->_u._ext.ext->nsaddrs[0]);
michael@0: 
michael@0: 		    cp = buf + sizeof("nameserver") - 1;
michael@0: 		    while (*cp == ' ' || *cp == '\t')
michael@0: 			cp++;
michael@0: 		    cp[strcspn(cp, ";# \t\n")] = '\0';
michael@0: 		    if ((*cp != '\0') && (*cp != '\n')) {
michael@0: 			memset(&hints, 0, sizeof(hints));
michael@0: 			hints.ai_family = PF_UNSPEC;
michael@0: 			hints.ai_socktype = SOCK_DGRAM;	/*dummy*/
michael@0: 			hints.ai_flags = AI_NUMERICHOST;
michael@0: 			sprintf(sbuf, "%u", NAMESERVER_PORT);
michael@0: 			if (getaddrinfo(cp, sbuf, &hints, &ai) == 0 &&
michael@0: 			    ai->ai_addrlen <= minsiz) {
michael@0: 			    if (statp->_u._ext.ext != NULL) {
michael@0: 				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
michael@0: 				    ai->ai_addr, ai->ai_addrlen);
michael@0: 			    }
michael@0: 			    if (ai->ai_addrlen <=
michael@0: 			        sizeof(statp->nsaddr_list[nserv])) {
michael@0: 				memcpy(&statp->nsaddr_list[nserv],
michael@0: 				    ai->ai_addr, ai->ai_addrlen);
michael@0: 			    } else
michael@0: 				statp->nsaddr_list[nserv].sin_family = 0;
michael@0: 			    freeaddrinfo(ai);
michael@0: 			    nserv++;
michael@0: 			}
michael@0: 		    }
michael@0: 		    continue;
michael@0: 		}
michael@0: 		if (MATCH(buf, "sortlist")) {
michael@0: 		    struct in_addr a;
michael@0: 
michael@0: 		    cp = buf + sizeof("sortlist") - 1;
michael@0: 		    while (nsort < MAXRESOLVSORT) {
michael@0: 			while (*cp == ' ' || *cp == '\t')
michael@0: 			    cp++;
michael@0: 			if (*cp == '\0' || *cp == '\n' || *cp == ';')
michael@0: 			    break;
michael@0: 			net = cp;
michael@0: 			while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
michael@0: 			       isascii(*cp) && !isspace((unsigned char)*cp))
michael@0: 				cp++;
michael@0: 			n = *cp;
michael@0: 			*cp = 0;
michael@0: 			if (inet_aton(net, &a)) {
michael@0: 			    statp->sort_list[nsort].addr = a;
michael@0: 			    if (ISSORTMASK(n)) {
michael@0: 				*cp++ = n;
michael@0: 				net = cp;
michael@0: 				while (*cp && *cp != ';' &&
michael@0: 					isascii(*cp) &&
michael@0: 					!isspace((unsigned char)*cp))
michael@0: 				    cp++;
michael@0: 				n = *cp;
michael@0: 				*cp = 0;
michael@0: 				if (inet_aton(net, &a)) {
michael@0: 				    statp->sort_list[nsort].mask = a.s_addr;
michael@0: 				} else {
michael@0: 				    statp->sort_list[nsort].mask =
michael@0: 					net_mask(statp->sort_list[nsort].addr);
michael@0: 				}
michael@0: 			    } else {
michael@0: 				statp->sort_list[nsort].mask =
michael@0: 				    net_mask(statp->sort_list[nsort].addr);
michael@0: 			    }
michael@0: 			    nsort++;
michael@0: 			}
michael@0: 			*cp = n;
michael@0: 		    }
michael@0: 		    continue;
michael@0: 		}
michael@0: 		if (MATCH(buf, "options")) {
michael@0: 		    res_setoptions(statp, buf + sizeof("options") - 1, "conf");
michael@0: 		    continue;
michael@0: 		}
michael@0: 	    }
michael@0: 	    if (nserv > 0)
michael@0: 		statp->nscount = nserv;
michael@0: 	    statp->nsort = nsort;
michael@0: 	    (void) fclose(fp);
michael@0: 	}
michael@0: #endif /* !ANDROID_CHANGES */
michael@0: /*
michael@0:  * Last chance to get a nameserver.  This should not normally
michael@0:  * be necessary
michael@0:  */
michael@0: #ifdef NO_RESOLV_CONF
michael@0: 	if(nserv == 0)
michael@0: 		nserv = get_nameservers(statp);
michael@0: #endif
michael@0: 
michael@0: 	if (statp->defdname[0] == 0 &&
michael@0: 	    gethostname(buf, sizeof(statp->defdname) - 1) == 0 &&
michael@0: 	    (cp = strchr(buf, '.')) != NULL)
michael@0: 		strcpy(statp->defdname, cp + 1);
michael@0: 
michael@0: 	/* find components of local domain that might be searched */
michael@0: 	if (havesearch == 0) {
michael@0: 		pp = statp->dnsrch;
michael@0: 		*pp++ = statp->defdname;
michael@0: 		*pp = NULL;
michael@0: 
michael@0: 		dots = 0;
michael@0: 		for (cp = statp->defdname; *cp; cp++)
michael@0: 			dots += (*cp == '.');
michael@0: 
michael@0: 		cp = statp->defdname;
michael@0: 		while (pp < statp->dnsrch + MAXDFLSRCH) {
michael@0: 			if (dots < LOCALDOMAINPARTS)
michael@0: 				break;
michael@0: 			cp = strchr(cp, '.') + 1;    /* we know there is one */
michael@0: 			*pp++ = cp;
michael@0: 			dots--;
michael@0: 		}
michael@0: 		*pp = NULL;
michael@0: #ifdef DEBUG
michael@0: 		if (statp->options & RES_DEBUG) {
michael@0: 			printf(";; res_init()... default dnsrch list:\n");
michael@0: 			for (pp = statp->dnsrch; *pp; pp++)
michael@0: 				printf(";;\t%s\n", *pp);
michael@0: 			printf(";;\t..END..\n");
michael@0: 		}
michael@0: #endif
michael@0: 	}
michael@0: 
michael@0: 	if ((cp = getenv("RES_OPTIONS")) != NULL)
michael@0: 		res_setoptions(statp, cp, "env");
michael@0: 	if (nserv > 0) {
michael@0: 		statp->nscount = nserv;
michael@0: 		statp->options |= RES_INIT;
michael@0: 	}
michael@0: 	return (0);
michael@0: }
michael@0: 
michael@0: static void
michael@0: res_setoptions(res_state statp, const char *options, const char *source)
michael@0: {
michael@0: 	const char *cp = options;
michael@0: 	int i;
michael@0: 	struct __res_state_ext *ext = statp->_u._ext.ext;
michael@0: 
michael@0: #ifdef DEBUG
michael@0: 	if (statp->options & RES_DEBUG)
michael@0: 		printf(";; res_setoptions(\"%s\", \"%s\")...\n",
michael@0: 		       options, source);
michael@0: #endif
michael@0: 	while (*cp) {
michael@0: 		/* skip leading and inner runs of spaces */
michael@0: 		while (*cp == ' ' || *cp == '\t')
michael@0: 			cp++;
michael@0: 		/* search for and process individual options */
michael@0: 		if (!strncmp(cp, "ndots:", sizeof("ndots:") - 1)) {
michael@0: 			i = atoi(cp + sizeof("ndots:") - 1);
michael@0: 			if (i <= RES_MAXNDOTS)
michael@0: 				statp->ndots = i;
michael@0: 			else
michael@0: 				statp->ndots = RES_MAXNDOTS;
michael@0: #ifdef DEBUG
michael@0: 			if (statp->options & RES_DEBUG)
michael@0: 				printf(";;\tndots=%d\n", statp->ndots);
michael@0: #endif
michael@0: 		} else if (!strncmp(cp, "timeout:", sizeof("timeout:") - 1)) {
michael@0: 			i = atoi(cp + sizeof("timeout:") - 1);
michael@0: 			if (i <= RES_MAXRETRANS)
michael@0: 				statp->retrans = i;
michael@0: 			else
michael@0: 				statp->retrans = RES_MAXRETRANS;
michael@0: #ifdef DEBUG
michael@0: 			if (statp->options & RES_DEBUG)
michael@0: 				printf(";;\ttimeout=%d\n", statp->retrans);
michael@0: #endif
michael@0: 		} else if (!strncmp(cp, "attempts:", sizeof("attempts:") - 1)){
michael@0: 			i = atoi(cp + sizeof("attempts:") - 1);
michael@0: 			if (i <= RES_MAXRETRY)
michael@0: 				statp->retry = i;
michael@0: 			else
michael@0: 				statp->retry = RES_MAXRETRY;
michael@0: #ifdef DEBUG
michael@0: 			if (statp->options & RES_DEBUG)
michael@0: 				printf(";;\tattempts=%d\n", statp->retry);
michael@0: #endif
michael@0: 		} else if (!strncmp(cp, "debug", sizeof("debug") - 1)) {
michael@0: #ifdef DEBUG
michael@0: 			if (!(statp->options & RES_DEBUG)) {
michael@0: 				printf(";; res_setoptions(\"%s\", \"%s\")..\n",
michael@0: 				       options, source);
michael@0: 				statp->options |= RES_DEBUG;
michael@0: 			}
michael@0: 			printf(";;\tdebug\n");
michael@0: #endif
michael@0: 		} else if (!strncmp(cp, "no_tld_query",
michael@0: 				    sizeof("no_tld_query") - 1) ||
michael@0: 			   !strncmp(cp, "no-tld-query",
michael@0: 				    sizeof("no-tld-query") - 1)) {
michael@0: 			statp->options |= RES_NOTLDQUERY;
michael@0: 		} else if (!strncmp(cp, "inet6", sizeof("inet6") - 1)) {
michael@0: 			statp->options |= RES_USE_INET6;
michael@0: 		} else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
michael@0: 			statp->options |= RES_ROTATE;
michael@0: 		} else if (!strncmp(cp, "no-check-names",
michael@0: 				    sizeof("no-check-names") - 1)) {
michael@0: 			statp->options |= RES_NOCHECKNAME;
michael@0: 		}
michael@0: #ifdef RES_USE_EDNS0
michael@0: 		else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
michael@0: 			statp->options |= RES_USE_EDNS0;
michael@0: 		}
michael@0: #endif
michael@0: 		else if (!strncmp(cp, "dname", sizeof("dname") - 1)) {
michael@0: 			statp->options |= RES_USE_DNAME;
michael@0: 		}
michael@0: 		else if (!strncmp(cp, "nibble:", sizeof("nibble:") - 1)) {
michael@0: 			if (ext == NULL)
michael@0: 				goto skip;
michael@0: 			cp += sizeof("nibble:") - 1;
michael@0: 			i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix) - 1);
michael@0: 			strncpy(ext->nsuffix, cp, (size_t)i);
michael@0: 			ext->nsuffix[i] = '\0';
michael@0: 		}
michael@0: 		else if (!strncmp(cp, "nibble2:", sizeof("nibble2:") - 1)) {
michael@0: 			if (ext == NULL)
michael@0: 				goto skip;
michael@0: 			cp += sizeof("nibble2:") - 1;
michael@0: 			i = MIN(strcspn(cp, " \t"), sizeof(ext->nsuffix2) - 1);
michael@0: 			strncpy(ext->nsuffix2, cp, (size_t)i);
michael@0: 			ext->nsuffix2[i] = '\0';
michael@0: 		}
michael@0: 		else if (!strncmp(cp, "v6revmode:", sizeof("v6revmode:") - 1)) {
michael@0: 			cp += sizeof("v6revmode:") - 1;
michael@0: 			/* "nibble" and "bitstring" used to be valid */
michael@0: 			if (!strncmp(cp, "single", sizeof("single") - 1)) {
michael@0: 				statp->options |= RES_NO_NIBBLE2;
michael@0: 			} else if (!strncmp(cp, "both", sizeof("both") - 1)) {
michael@0: 				statp->options &=
michael@0: 					 ~RES_NO_NIBBLE2;
michael@0: 			}
michael@0: 		}
michael@0: 		else {
michael@0: 			/* XXX - print a warning here? */
michael@0: 		}
michael@0:    skip:
michael@0: 		/* skip to next run of spaces */
michael@0: 		while (*cp && *cp != ' ' && *cp != '\t')
michael@0: 			cp++;
michael@0: 	}
michael@0: }
michael@0: 
michael@0: /* XXX - should really support CIDR which means explicit masks always. */
michael@0: static u_int32_t
michael@0: net_mask(in)		/* XXX - should really use system's version of this */
michael@0: 	struct in_addr in;
michael@0: {
michael@0: 	register u_int32_t i = ntohl(in.s_addr);
michael@0: 
michael@0: 	if (IN_CLASSA(i))
michael@0: 		return (htonl(IN_CLASSA_NET));
michael@0: 	else if (IN_CLASSB(i))
michael@0: 		return (htonl(IN_CLASSB_NET));
michael@0: 	return (htonl(IN_CLASSC_NET));
michael@0: }
michael@0: 
michael@0: u_int
michael@0: res_randomid(void) {
michael@0: 	struct timeval now;
michael@0: 
michael@0: 	gettimeofday(&now, NULL);
michael@0: 	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * This routine is for closing the socket if a virtual circuit is used and
michael@0:  * the program wants to close it.  This provides support for endhostent()
michael@0:  * which expects to close the socket.
michael@0:  *
michael@0:  * This routine is not expected to be user visible.
michael@0:  */
michael@0: void
michael@0: res_nclose(res_state statp) {
michael@0: 	int ns;
michael@0: 
michael@0: 	if (statp->_vcsock >= 0) {
michael@0: 		(void) close(statp->_vcsock);
michael@0: 		statp->_vcsock = -1;
michael@0: 		statp->_flags &= ~(RES_F_VC | RES_F_CONN);
michael@0: 	}
michael@0: 	for (ns = 0; ns < statp->_u._ext.nscount; ns++) {
michael@0: 		if (statp->_u._ext.nssocks[ns] != -1) {
michael@0: 			(void) close(statp->_u._ext.nssocks[ns]);
michael@0: 			statp->_u._ext.nssocks[ns] = -1;
michael@0: 		}
michael@0: 	}
michael@0: }
michael@0: 
michael@0: void
michael@0: res_ndestroy(res_state statp) {
michael@0: 	res_nclose(statp);
michael@0: 	if (statp->_u._ext.ext != NULL)
michael@0: 		free(statp->_u._ext.ext);
michael@0: 	statp->options &= ~RES_INIT;
michael@0: 	statp->_u._ext.ext = NULL;
michael@0: }
michael@0: 
michael@0: const char *
michael@0: res_get_nibblesuffix(res_state statp) {
michael@0: 	if (statp->_u._ext.ext)
michael@0: 		return (statp->_u._ext.ext->nsuffix);
michael@0: 	return ("ip6.arpa");
michael@0: }
michael@0: 
michael@0: const char *
michael@0: res_get_nibblesuffix2(res_state statp) {
michael@0: 	if (statp->_u._ext.ext)
michael@0: 		return (statp->_u._ext.ext->nsuffix2);
michael@0: 	return ("ip6.int");
michael@0: }
michael@0: 
michael@0: void
michael@0: res_setservers(res_state statp, const union res_sockaddr_union *set, int cnt) {
michael@0: 	int i, nserv;
michael@0: 	size_t size;
michael@0: 
michael@0: 	/* close open servers */
michael@0: 	res_nclose(statp);
michael@0: 
michael@0: 	/* cause rtt times to be forgotten */
michael@0: 	statp->_u._ext.nscount = 0;
michael@0: 
michael@0: 	nserv = 0;
michael@0: 	for (i = 0; i < cnt && nserv < MAXNS; i++) {
michael@0: 		switch (set->sin.sin_family) {
michael@0: 		case AF_INET:
michael@0: 			size = sizeof(set->sin);
michael@0: 			if (statp->_u._ext.ext)
michael@0: 				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
michael@0: 					&set->sin, size);
michael@0: 			if (size <= sizeof(statp->nsaddr_list[nserv]))
michael@0: 				memcpy(&statp->nsaddr_list[nserv],
michael@0: 					&set->sin, size);
michael@0: #ifdef notdef
michael@0: 			else
michael@0: 				statp->nsaddr_list[nserv].sin_family = 0;
michael@0: #endif
michael@0: 			nserv++;
michael@0: 			break;
michael@0: 
michael@0: #ifdef HAS_INET6_STRUCTS
michael@0: 		case AF_INET6:
michael@0: 			size = sizeof(set->sin6);
michael@0: 			if (statp->_u._ext.ext)
michael@0: 				memcpy(&statp->_u._ext.ext->nsaddrs[nserv],
michael@0: 					&set->sin6, size);
michael@0: 			if (size <= sizeof(statp->nsaddr_list[nserv]))
michael@0: 				memcpy(&statp->nsaddr_list[nserv],
michael@0: 					&set->sin6, size);
michael@0: 			else
michael@0: 				statp->nsaddr_list[nserv].sin_family = 0;
michael@0: 			nserv++;
michael@0: 			break;
michael@0: #endif
michael@0: 
michael@0: 		default:
michael@0: 			break;
michael@0: 		}
michael@0: 		set++;
michael@0: 	}
michael@0: 	statp->nscount = nserv;
michael@0: 
michael@0: }
michael@0: 
michael@0: int
michael@0: res_getservers(res_state statp, union res_sockaddr_union *set, int cnt) {
michael@0: 	int i;
michael@0: 	size_t size;
michael@0: 	u_int16_t family;
michael@0: 
michael@0: 	for (i = 0; i < statp->nscount && i < cnt; i++) {
michael@0: 		if (statp->_u._ext.ext)
michael@0: 			family = statp->_u._ext.ext->nsaddrs[i].sin.sin_family;
michael@0: 		else
michael@0: 			family = statp->nsaddr_list[i].sin_family;
michael@0: 
michael@0: 		switch (family) {
michael@0: 		case AF_INET:
michael@0: 			size = sizeof(set->sin);
michael@0: 			if (statp->_u._ext.ext)
michael@0: 				memcpy(&set->sin,
michael@0: 				       &statp->_u._ext.ext->nsaddrs[i],
michael@0: 				       size);
michael@0: 			else
michael@0: 				memcpy(&set->sin, &statp->nsaddr_list[i],
michael@0: 				       size);
michael@0: 			break;
michael@0: 
michael@0: #ifdef HAS_INET6_STRUCTS
michael@0: 		case AF_INET6:
michael@0: 			size = sizeof(set->sin6);
michael@0: 			if (statp->_u._ext.ext)
michael@0: 				memcpy(&set->sin6,
michael@0: 				       &statp->_u._ext.ext->nsaddrs[i],
michael@0: 				       size);
michael@0: 			else
michael@0: 				memcpy(&set->sin6, &statp->nsaddr_list[i],
michael@0: 				       size);
michael@0: 			break;
michael@0: #endif
michael@0: 
michael@0: 		default:
michael@0: 			set->sin.sin_family = 0;
michael@0: 			break;
michael@0: 		}
michael@0: 		set++;
michael@0: 	}
michael@0: 	return (statp->nscount);
michael@0: }
michael@0: 
michael@0: #ifdef ANDROID_CHANGES
michael@0: static int _get_dns_change_count()
michael@0: {
michael@0: 	if (dns_change_prop == NULL) {
michael@0: 		dns_change_prop = __system_property_find(DNS_CHANGE_PROP_NAME);
michael@0: 	}
michael@0: 	if (dns_change_prop != NULL) {
michael@0: 		char propvalue[PROP_VALUE_MAX];
michael@0: 		if (__system_property_read(dns_change_prop, NULL, propvalue) >= 1) {
michael@0: 			return atoi(propvalue);
michael@0: 		}
michael@0: 	}
michael@0: 	return -1;
michael@0: }
michael@0: 
michael@0: int res_get_dns_changed()
michael@0: {
michael@0: 	int change_count;
michael@0: 
michael@0: 	change_count = _get_dns_change_count();
michael@0: 	if (change_count != dns_last_change_counter) {
michael@0: 		if (change_count != -1) {
michael@0: 			dns_last_change_counter = change_count;
michael@0: 		}
michael@0: 		return 1;
michael@0: 	} else {
michael@0: 		return 0;
michael@0: 	}
michael@0: }
michael@0: #endif /* ANDROID_CHANGES */