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freebsd-skq/lib/libc/resolv/res_init.c
Bjoern A. Zeeb 8489ecae84 Allow the use of TCP instead of UDP for queries by setting options usevc 
in resolv.conf which sets RES_USEVC.

Reviewed by:	ume
MFC after:	17 days
Differential Revision:	https://reviews.freebsd.org/D16607
2018-08-16 13:18:40 +00:00

953 lines
26 KiB
C
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/*-
* SPDX-License-Identifier: (BSD-3-Clause AND ISC)
*
* 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. 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)res_init.c 8.1 (Berkeley) 6/7/93";
static const char rcsid[] = "$Id: res_init.c,v 1.26 2008/12/11 09:59:00 marka Exp $";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "port_before.h"
#include "namespace.h"
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.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>
#ifndef HAVE_MD5
# include "../dst/md5.h"
#else
# ifdef SOLARIS2
# include <sys/md5.h>
# elif _LIBC
# include <md5.h>
# endif
#endif
#ifndef _MD5_H_
# define _MD5_H_ 1 /*%< make sure we do not include rsaref md5.h file */
#endif
#include "un-namespace.h"
#include "port_after.h"
/* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */
#include <resolv.h>
#include "res_private.h"
/*% Options. Should all be left alone. */
#define RESOLVSORT
#ifndef DEBUG
#define DEBUG
#endif
#ifdef SOLARIS2
#include <sys/systeminfo.h>
#endif
static void res_setoptions(res_state, const char *, const char *);
#ifdef RESOLVSORT
static const char sort_mask[] = "/&";
#define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL)
static u_int32_t net_mask(struct in_addr);
#endif
#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 interim 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));
}
/*% This function has to be reachable by res_data.c but not publicly. */
int
__res_vinit(res_state statp, int preinit) {
FILE *fp;
char *cp, **pp;
int n;
char buf[BUFSIZ];
int nserv = 0; /*%< number of nameserver records read from file */
int haveenv = 0;
int havesearch = 0;
#ifdef RESOLVSORT
int nsort = 0;
char *net;
#endif
int dots;
union res_sockaddr_union u[2];
int maxns = MAXNS;
RES_SET_H_ERRNO(statp, 0);
if (statp->_u._ext.ext != NULL)
res_ndestroy(statp);
if (!preinit) {
statp->retrans = RES_TIMEOUT;
statp->retry = RES_DFLRETRY;
statp->options = RES_DEFAULT;
}
statp->_rnd = malloc(16);
res_rndinit(statp);
statp->id = res_nrandomid(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->_u._ext.ext->reload_period = 2;
} else {
/*
* Historically res_init() rarely, if at all, failed.
* Examples and applications exist which do not check
* our return code. Furthermore several applications
* simply call us to get the systems domainname. So
* rather then immediately fail here we store the
* failure, which is returned later, in h_errno. And
* prevent the collection of 'nameserver' information
* by setting maxns to 0. Thus applications that fail
* to check our return code wont be able to make
* queries anyhow.
*/
RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
maxns = 0;
}
#ifdef RESOLVSORT
statp->nsort = 0;
#endif
res_setservers(statp, u, nserv);
#ifdef SOLARIS2
/*
* The old libresolv derived the defaultdomain from NIS/NIS+.
* We want to keep this behaviour
*/
{
char buf[sizeof(statp->defdname)], *cp;
int ret;
if ((ret = sysinfo(SI_SRPC_DOMAIN, buf, sizeof(buf))) > 0 &&
(unsigned int)ret <= sizeof(buf)) {
if (buf[0] == '+')
buf[0] = '.';
cp = strchr(buf, '.');
cp = (cp == NULL) ? buf : (cp + 1);
strncpy(statp->defdname, cp,
sizeof(statp->defdname) - 1);
statp->defdname[sizeof(statp->defdname) - 1] = '\0';
}
}
#endif /* SOLARIS2 */
/* Allow user to override the local domain definition */
if (issetugid() == 0 && (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++ = NULL;
}
#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, "re")) != NULL) {
struct stat sb;
struct timespec now;
if (statp->_u._ext.ext != NULL) {
if (_fstat(fileno(fp), &sb) == 0) {
statp->_u._ext.ext->conf_mtim = sb.st_mtim;
if (clock_gettime(CLOCK_MONOTONIC_FAST, &now) == 0) {
statp->_u._ext.ext->conf_stat = now.tv_sec;
}
}
}
/* 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++ = NULL;
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) {
if (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;
nserv++;
}
freeaddrinfo(ai);
}
}
continue;
}
#ifdef RESOLVSORT
if (MATCH(buf, "sortlist")) {
struct in_addr a;
struct in6_addr a6;
int m, i;
u_char *u;
struct __res_state_ext *ext = statp->_u._ext.ext;
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);
}
ext->sort_list[nsort].af = AF_INET;
ext->sort_list[nsort].addr.ina =
statp->sort_list[nsort].addr;
ext->sort_list[nsort].mask.ina.s_addr =
statp->sort_list[nsort].mask;
nsort++;
}
else if (inet_pton(AF_INET6, net, &a6) == 1) {
ext->sort_list[nsort].af = AF_INET6;
ext->sort_list[nsort].addr.in6a = a6;
u = (u_char *)&ext->sort_list[nsort].mask.in6a;
*cp++ = n;
net = cp;
while (*cp && *cp != ';' &&
isascii(*cp) && !isspace(*cp))
cp++;
m = n;
n = *cp;
*cp = 0;
switch (m) {
case '/':
m = atoi(net);
break;
case '&':
if (inet_pton(AF_INET6, net, u) == 1) {
m = -1;
break;
}
/*FALLTHROUGH*/
default:
m = sizeof(struct in6_addr) * CHAR_BIT;
break;
}
if (m >= 0) {
for (i = 0; i < sizeof(struct in6_addr); i++) {
if (m <= 0) {
*u = 0;
} else {
m -= CHAR_BIT;
*u = (u_char)~0;
if (m < 0)
*u <<= -m;
}
u++;
}
}
statp->sort_list[nsort].addr.s_addr =
(u_int32_t)0xffffffff;
statp->sort_list[nsort].mask =
(u_int32_t)0xffffffff;
nsort++;
}
*cp = n;
}
continue;
}
#endif
if (MATCH(buf, "options")) {
res_setoptions(statp, buf + sizeof("options") - 1, "conf");
continue;
}
}
if (nserv > 0)
statp->nscount = nserv;
#ifdef RESOLVSORT
statp->nsort = nsort;
#endif
(void) fclose(fp);
}
/*
* 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 (issetugid())
statp->options |= RES_NOALIASES;
else if ((cp = getenv("RES_OPTIONS")) != NULL)
res_setoptions(statp, cp, "env");
statp->options |= RES_INIT;
return (statp->res_h_errno);
}
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
#ifdef SOLARIS2
} else if (!strncmp(cp, "retrans:", sizeof("retrans:") - 1)) {
/*
* For backward compatibility, 'retrans' is
* supported as an alias for 'timeout', though
* without an imposed maximum.
*/
statp->retrans = atoi(cp + sizeof("retrans:") - 1);
} else if (!strncmp(cp, "retry:", sizeof("retry:") - 1)){
/*
* For backward compatibility, 'retry' is
* supported as an alias for 'attempts', though
* without an imposed maximum.
*/
statp->retry = atoi(cp + sizeof("retry:") - 1);
#endif /* SOLARIS2 */
} 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, "insecure1", sizeof("insecure1") - 1)) {
statp->options |= RES_INSECURE1;
} else if (!strncmp(cp, "insecure2", sizeof("insecure2") - 1)) {
statp->options |= RES_INSECURE2;
} else if (!strncmp(cp, "rotate", sizeof("rotate") - 1)) {
statp->options |= RES_ROTATE;
} else if (!strncmp(cp, "usevc", sizeof("usevc") - 1)) {
statp->options |= RES_USEVC;
} else if (!strncmp(cp, "no-check-names",
sizeof("no-check-names") - 1)) {
statp->options |= RES_NOCHECKNAME;
} else if (!strncmp(cp, "reload-period:",
sizeof("reload-period:") - 1)) {
if (ext != NULL) {
ext->reload_period = (u_short)
atoi(cp + sizeof("reload-period:") - 1);
}
}
#ifdef RES_USE_EDNS0
else if (!strncmp(cp, "edns0", sizeof("edns0") - 1)) {
statp->options |= RES_USE_EDNS0;
}
#endif
#ifndef _LIBC
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, 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, 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;
}
}
#endif
else {
/* XXX - print a warning here? */
}
#ifndef _LIBC
skip:
#endif
/* skip to next run of spaces */
while (*cp && *cp != ' ' && *cp != '\t')
cp++;
}
}
#ifdef RESOLVSORT
/* XXX - should really support CIDR which means explicit masks always. */
static u_int32_t
net_mask(struct in_addr in) /*!< XXX - should really use system's version of this */
{
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));
}
#endif
static u_char srnd[16];
void
res_rndinit(res_state statp)
{
struct timeval now;
u_int32_t u32;
u_int16_t u16;
u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
gettimeofday(&now, NULL);
u32 = now.tv_sec;
memcpy(rnd, &u32, 4);
u32 = now.tv_usec;
memcpy(rnd + 4, &u32, 4);
u32 += now.tv_sec;
memcpy(rnd + 8, &u32, 4);
u16 = getpid();
memcpy(rnd + 12, &u16, 2);
}
u_int
res_nrandomid(res_state statp) {
struct timeval now;
u_int16_t u16;
MD5_CTX ctx;
u_char *rnd = statp->_rnd == NULL ? srnd : statp->_rnd;
gettimeofday(&now, NULL);
u16 = (u_int16_t) (now.tv_sec ^ now.tv_usec);
memcpy(rnd + 14, &u16, 2);
#ifndef HAVE_MD5
MD5_Init(&ctx);
MD5_Update(&ctx, rnd, 16);
MD5_Final(rnd, &ctx);
#else
MD5Init(&ctx);
MD5Update(&ctx, rnd, 16);
MD5Final(rnd, &ctx);
#endif
memcpy(&u16, rnd + 14, 2);
return ((u_int) u16);
}
/*%
* 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->_u._ext.ext = NULL;
}
if (statp->_rnd != NULL) {
free(statp->_rnd);
statp->_rnd = NULL;
}
statp->options &= ~RES_INIT;
}
#ifndef _LIBC
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");
}
#endif
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);
else
statp->nsaddr_list[nserv].sin_family = 0;
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);
}
/*! \file */
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