4661fda2e5
This patch fixes a leak that occurs when creating a new thread-specific DNS resolver state object. Essentially, each thread that calls gethostbyname() or getaddrinfo() at least once will leak a small memory block. Another leak happens anytime these functions are called after a change of the network settings. The leak is insignificant and hard to notice on typical programs. However, netd tends to create one new thread for each DNS request it processes, and quickly grows in size after a > 20 hours. The same problem is seen in other system processes that tend to create one thread per request too. The leak occured becasue res_ninit() was called twice when creating a new thread-specific DNS resolver state in _res_get_thread(). This function could not properly reset an existing thread and was leaking a memory block. The patch does two things: - First, it fixes res_ninit() to prevent any leakage when resetting the state of a given res_state instance. - Second, it modifies the _res_get_thread() implementation to make it more explicit, and avoid calling res_ninit() twice in a row on first-time creation. Fix for Bug 4089945, and Bug 4090857 Change-Id: Ie4831a8dbe82be8f07fce5ddd1d36bf95994f836
903 lines
25 KiB
C
903 lines
25 KiB
C
/* $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.
|
|
*/
|
|
|
|
#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"
|
|
static const prop_info *dns_change_prop;
|
|
static 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
|
|
static 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 ((statp->options & RES_INIT) != 0U)
|
|
res_ndestroy(statp);
|
|
|
|
if (!preinit) {
|
|
statp->retrans = RES_TIMEOUT;
|
|
statp->retry = RES_DFLRETRY;
|
|
statp->options = RES_DEFAULT;
|
|
statp->id = res_randomid();
|
|
}
|
|
|
|
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 */
|