diff options
Diffstat (limited to 'REORG.TODO/resolv/res_init.c')
| -rw-r--r-- | REORG.TODO/resolv/res_init.c | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/REORG.TODO/resolv/res_init.c b/REORG.TODO/resolv/res_init.c new file mode 100644 index 0000000000..23676e994d --- /dev/null +++ b/REORG.TODO/resolv/res_init.c @@ -0,0 +1,542 @@ +/* + * 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. + * 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. + */ + +/* + * 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS + * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE + * CONSORTIUM 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 <ctype.h> +#include <netdb.h> +#include <resolv/resolv-internal.h> +#include <stdio.h> +#include <stdio_ext.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <stdint.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> +#include <net/if.h> +#include <netinet/in.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <sys/time.h> +#include <sys/types.h> +#include <inet/net-internal.h> + +#include <not-cancel.h> + +/* Options. Should all be left alone. */ +/* #undef DEBUG */ + +static void res_setoptions (res_state, const char *, const char *) + internal_function; + +static const char sort_mask_chars[] = "/&"; +#define ISSORTMASK(ch) (strchr(sort_mask_chars, ch) != NULL) +static u_int32_t net_mask (struct in_addr) __THROW; + +unsigned long long int __res_initstamp attribute_hidden; + +/* + * 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_LOOPBACK and the default domain name comes from gethostname. + * + * 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)); +} +libc_hidden_def (__res_ninit) + +/* This function has to be reachable by res_data.c but not publically. */ +int +__res_vinit(res_state statp, int preinit) { + FILE *fp; + char *cp, **pp; + int n; + char buf[BUFSIZ]; + int nserv = 0; /* number of nameservers read from file */ + int have_serv6 = 0; + int haveenv = 0; + int havesearch = 0; + int nsort = 0; + char *net; + statp->_u._ext.initstamp = __res_initstamp; + + if (!preinit) { + statp->retrans = RES_TIMEOUT; + statp->retry = RES_DFLRETRY; + statp->options = RES_DEFAULT; + statp->id = res_randomid(); + } + + statp->nscount = 0; + statp->defdname[0] = '\0'; + statp->ndots = 1; + statp->pfcode = 0; + statp->_vcsock = -1; + statp->_flags = 0; + statp->__glibc_unused_qhook = NULL; + statp->__glibc_unused_rhook = NULL; + statp->_u._ext.nscount = 0; + for (n = 0; n < MAXNS; n++) + statp->_u._ext.nsaddrs[n] = NULL; + + /* 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; + } + +#define MATCH(line, name) \ + (!strncmp(line, name, sizeof(name) - 1) && \ + (line[sizeof(name) - 1] == ' ' || \ + line[sizeof(name) - 1] == '\t')) + + if ((fp = fopen(_PATH_RESCONF, "rce")) != NULL) { + /* No threads use this stream. */ + __fsetlocking (fp, FSETLOCKING_BYCALLER); + /* read the config file */ + while (__fgets_unlocked(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 in_addr a; + + cp = buf + sizeof("nameserver") - 1; + while (*cp == ' ' || *cp == '\t') + cp++; + if ((*cp != '\0') && (*cp != '\n') + && __inet_aton(cp, &a)) { + statp->nsaddr_list[nserv].sin_addr = a; + statp->nsaddr_list[nserv].sin_family = AF_INET; + statp->nsaddr_list[nserv].sin_port = + htons(NAMESERVER_PORT); + nserv++; + } else { + struct in6_addr a6; + char *el; + + if ((el = strpbrk(cp, " \t\n")) != NULL) + *el = '\0'; + if ((el = strchr(cp, SCOPE_DELIMITER)) != NULL) + *el = '\0'; + if ((*cp != '\0') && + (__inet_pton(AF_INET6, cp, &a6) > 0)) { + struct sockaddr_in6 *sa6; + + sa6 = malloc(sizeof(*sa6)); + if (sa6 != NULL) { + sa6->sin6_family = AF_INET6; + sa6->sin6_port = htons(NAMESERVER_PORT); + sa6->sin6_flowinfo = 0; + sa6->sin6_addr = a6; + + sa6->sin6_scope_id = 0; + if (__glibc_likely (el != NULL)) { + /* Ignore errors, for backwards + compatibility. */ + (void) __inet6_scopeid_pton + (&a6, el + 1, &sa6->sin6_scope_id); + } + + statp->nsaddr_list[nserv].sin_family = 0; + statp->_u._ext.nsaddrs[nserv] = sa6; + statp->_u._ext.nssocks[nserv] = -1; + have_serv6 = 1; + 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(*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(*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; + } + } + statp->nscount = nserv; + if (have_serv6) { + /* We try IPv6 servers again. */ + statp->ipv6_unavail = false; + } + statp->nsort = nsort; + (void) fclose(fp); + } + if (__glibc_unlikely (statp->nscount == 0)) { + statp->nsaddr.sin_addr = __inet_makeaddr(IN_LOOPBACKNET, 1); + statp->nsaddr.sin_family = AF_INET; + statp->nsaddr.sin_port = htons(NAMESERVER_PORT); + statp->nscount = 1; + } + 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; + + } + + if ((cp = getenv("RES_OPTIONS")) != NULL) + res_setoptions(statp, cp, "env"); + statp->options |= RES_INIT; + return (0); +} + +static void +internal_function +res_setoptions(res_state statp, const char *options, const char *source) { + const char *cp = options; + int i; + +#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; + } 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; + } 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 { + static const struct + { + char str[22]; + uint8_t len; + uint8_t clear; + unsigned long int flag; + } options[] = { +#define STRnLEN(str) str, sizeof (str) - 1 + { STRnLEN ("inet6"), 0, DEPRECATED_RES_USE_INET6 }, + { STRnLEN ("rotate"), 0, RES_ROTATE }, + { STRnLEN ("edns0"), 0, RES_USE_EDNS0 }, + { STRnLEN ("single-request-reopen"), 0, RES_SNGLKUPREOP }, + { STRnLEN ("single-request"), 0, RES_SNGLKUP }, + { STRnLEN ("no_tld_query"), 0, RES_NOTLDQUERY }, + { STRnLEN ("no-tld-query"), 0, RES_NOTLDQUERY }, + { STRnLEN ("use-vc"), 0, RES_USEVC } + }; +#define noptions (sizeof (options) / sizeof (options[0])) + int i; + for (i = 0; i < noptions; ++i) + if (strncmp (cp, options[i].str, options[i].len) == 0) + { + if (options[i].clear) + statp->options &= options[i].flag; + else + statp->options |= options[i].flag; + break; + } + if (i == noptions) { + /* XXX - print a warning here? */ + } + } + /* skip to next run of spaces */ + while (*cp && *cp != ' ' && *cp != '\t') + cp++; + } +} + +/* XXX - should really support CIDR which means explicit masks always. */ +/* XXX - should really use system's version of this */ +static u_int32_t +net_mask (struct in_addr in) +{ + 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) { + return 0xffff & __getpid(); +} +libc_hidden_def (__res_randomid) + + +/* + * 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_iclose(res_state statp, bool free_addr) { + int ns; + + if (statp->_vcsock >= 0) { + close_not_cancel_no_status(statp->_vcsock); + statp->_vcsock = -1; + statp->_flags &= ~(RES_F_VC | RES_F_CONN); + } + for (ns = 0; ns < statp->nscount; ns++) + if (statp->_u._ext.nsaddrs[ns]) { + if (statp->_u._ext.nssocks[ns] != -1) { + close_not_cancel_no_status(statp->_u._ext.nssocks[ns]); + statp->_u._ext.nssocks[ns] = -1; + } + if (free_addr) { + free (statp->_u._ext.nsaddrs[ns]); + statp->_u._ext.nsaddrs[ns] = NULL; + } + } +} +libc_hidden_def (__res_iclose) + +void +res_nclose(res_state statp) +{ + __res_iclose (statp, true); +} +libc_hidden_def (__res_nclose) + +/* This is called when a thread is exiting to free resources held in _res. */ +static void __attribute__ ((section ("__libc_thread_freeres_fn"))) +res_thread_freeres (void) +{ + if (_res.nscount == 0) + /* Never called res_ninit. */ + return; + + __res_iclose (&_res, true); /* Close any VC sockets. */ + + /* Make sure we do a full re-initialization the next time. */ + _res.options = 0; +} +text_set_element (__libc_thread_subfreeres, res_thread_freeres); +text_set_element (__libc_subfreeres, res_thread_freeres); |