The Tor Browser: other-licenses/android/res_init.c@97036ab72558 (annotated)

other-licenses/android/res_init.c@97036ab72558 (annotated)

other-licenses/android/res_init.c

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

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

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