/* * 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. */ /* * 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. */ #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 1.1 2006/03/01 19:01:38 majka Exp $"; #endif /* LIBC_SCCS and not lint */ #ifndef __APPLE__ #include "port_before.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef __APPLE__ #include #include #endif #ifndef __APPLE__ #include "port_after.h" #endif /* ensure that sockaddr_in6 and IN6ADDR_ANY_INIT are declared / defined */ #include #include "res_private.h" /* Options. Should all be left alone. */ #define RESOLVSORT #define DEBUG static void res_setoptions __P((res_state, const char *, const char *)); extern res_state res_state_new(); #ifdef RESOLVSORT static const char sort_mask[] = "/&"; #define ISSORTMASK(ch) (strchr(sort_mask, ch) != NULL) static u_int32_t net_mask __P((struct in_addr)); #endif #if !defined(isascii) /* XXX - could be a function */ # define isascii(c) (!(c & 0200)) #endif #define INET_NTOP_AF_INET_OFFSET 4 #define INET_NTOP_AF_INET6_OFFSET 8 /* * Resolver state default settings. */ res_state res_build_start(res_state x) { res_state res; res = NULL; if (x == NULL) { res = res_state_new(); } else { if ((x->options & RES_INIT) != 0) res_ndestroy(x); res = x; } if (res == NULL) return NULL; /* res_ndestroy frees _u._ext.ext so we create a new one if necessary */ if (res->_u._ext.ext == NULL) res->_u._ext.ext = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_ext)); /* make sure version is set */ res->_pad = 9; res->retry = RES_DFLRETRY; res->options = RES_DEFAULT; res->id = res_randomid(); res->ndots = 1; res->_vcsock = -1; if (res->_u._ext.ext != NULL) { strcpy(res->_u._ext.ext->nsuffix, "ip6.arpa"); strcpy(res->_u._ext.ext->nsuffix2, "ip6.int"); strcpy(res->_u._ext.ext->bsuffix, "ip6.arpa"); } return res; } int res_build_finish(res_state res, uint32_t timeout, uint16_t port) { if (res == NULL) return -1; if (res->nscount == 0) { #ifdef USELOOPBACK res->nsaddr_list[0].sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); #else res->nsaddr_list[0].sin_addr.s_addr = INADDR_ANY; #endif res->nsaddr_list[0].sin_family = AF_INET; res->nsaddr_list[0].sin_port = htons(port); #ifdef HAVE_SA_LEN res->nsaddr_list[0].sin_len = sizeof(struct sockaddr_in); #endif res->nscount = 1; /* * Force loopback queries to use TCP * so we don't take a timeout if named isn't running. */ res->options |= RES_USEVC; } if (timeout == 0) res->retrans = RES_MAXRETRANS; else res->retrans = timeout; res->options |= RES_INIT; return 0; } int res_build_sortlist(res_state res, struct in_addr addr, struct in_addr mask) { uint32_t n; if (res == NULL) return -1; n = res->nsort; if (n >= MAXRESOLVSORT) return -1; res->sort_list[n].addr = addr; res->sort_list[n].mask = mask.s_addr; n++; res->nsort = n; return 0; } char * res_next_word(char **p) { char *s, *x; if (p == NULL) return NULL; if (*p == NULL) return NULL; s = *p; /* Skip leading white space */ while ((*s == ' ') || (*s == '\t') || (*s == '\n')) s++; *p = s; if (*s == '\0') return NULL; /* Find end of word */ x = s; while ((*x != ' ') && (*x != '\t') && (*x != '\n') && (*x != '\0')) x++; if (*x != '\0') { *x = '\0'; x++; } *p = x; if (s == x) return NULL; return s; } int res_build(res_state res, uint16_t port, uint32_t *nsrch, char *key, char *val) { int32_t dotcount, semicount, status; int32_t ival, len; char *p, *lastdot; uint16_t aport; struct in_addr addr4, mask; struct sockaddr_in sin4; struct in6_addr addr6; struct sockaddr_in6 sin6; if (res == NULL) return -1; if (!strcmp(key, "domain")) { strncpy(res->defdname, val, sizeof(res->defdname) - 1); res->defdname[sizeof(res->defdname) - 1] = '\0'; return 0; } else if (!strcmp(key, "search")) { len = strlen(val) + 1; ival = sizeof(res->defdname); p = res->defdname; if ((*nsrch) == 0) { memset(res->defdname, 0, sizeof(res->defdname)); } else { p = res->dnsrch[*nsrch - 1]; for (; (ival > 0) && (*p != '\0'); ival--) p++; if (*p == '\0') p++; } if (len > ival) return -1; memcpy(p, val, len); res->dnsrch[*nsrch] = p; *nsrch = *nsrch + 1; return 0; } else if (!strcmp(key, "nameserver")) { dotcount = 0; semicount = 0; lastdot = NULL; aport = port; for (p = val; *p != '\0'; p++) { if (*p == ':') semicount++; else if (*p == '.') { dotcount++; lastdot = p; } } if ((dotcount == 4) || ((semicount > 0) && (lastdot != NULL))) { aport = atoi(lastdot + 1); if (aport == 0) aport = port; *lastdot = '\0'; } memset(&addr4, 0, sizeof(struct in_addr)); memset(&sin4, 0, sizeof(struct sockaddr_in)); memset(&addr6, 0, sizeof(struct in6_addr)); memset(&sin6, 0, sizeof(struct sockaddr_in6)); status = inet_pton(AF_INET6, val, &addr6); if (status == 1) { sin6.sin6_addr = addr6; sin6.sin6_family = AF_INET6; sin6.sin6_port = htons(aport); sin6.sin6_len = sizeof(struct sockaddr_in6); if (res->_u._ext.ext != NULL) { memcpy(&(res->_u._ext.ext->nsaddrs[res->nscount]), &sin6, sizeof(struct sockaddr_in6)); } res->nsaddr_list[res->nscount].sin_family = 0; res->nscount++; } else { status = inet_pton(AF_INET, val, &addr4); if (status == 1) { sin4.sin_addr = addr4; sin4.sin_family = AF_INET; sin4.sin_port = htons(aport); sin4.sin_len = sizeof(struct sockaddr_in); if (res->_u._ext.ext != NULL) { memcpy(&(res->_u._ext.ext->nsaddrs[res->nscount]), &sin4, sizeof(struct sockaddr_in)); } memcpy(&(res->nsaddr_list[res->nscount]), &sin4, sizeof(struct sockaddr_in)); res->nscount++; } } return 0; } else if (!strcmp(key, "sortlist")) { p = strchr(val, '/'); if (p != NULL) { *p = '\0'; p++; } /* we use inet_aton rather than inet_pton to be compatible with res_init() */ status = inet_aton(val, &addr4); if (status == 0) return -1; status = 0; if (p != NULL) status = inet_aton(p, &mask); if (status == 0) { ival = ntohl(addr4.s_addr); if (IN_CLASSA(ival)) mask.s_addr = htonl(IN_CLASSA_NET); else if (IN_CLASSB(ival)) mask.s_addr = htonl(IN_CLASSB_NET); else mask.s_addr = htonl(IN_CLASSC_NET); } return res_build_sortlist(res, addr4, mask); } else if (!strcmp(key, "ndots")) { ival = atoi(val); if (ival < 0) ival = 0; if (ival > RES_MAXNDOTS) ival = RES_MAXNDOTS; res->ndots = ival; return 0; } else if (!strcmp(key, "nibble")) { if ((strlen(val) + 1) > RES_EXT_SUFFIX_LEN) return -1; if (res->_u._ext.ext == NULL) return -1; strcpy(res->_u._ext.ext->nsuffix, val); return 0; } else if (!strcmp(key, "nibble2")) { if ((strlen(val) + 1) > RES_EXT_SUFFIX_LEN) return -1; if (res->_u._ext.ext == NULL) return -1; strcpy(res->_u._ext.ext->nsuffix2, val); return 0; } else if (!strcmp(key, "bitstring")) { if ((strlen(val) + 1) > RES_EXT_SUFFIX_LEN) return -1; if (res->_u._ext.ext == NULL) return -1; strcpy(res->_u._ext.ext->bsuffix, val); return 0; } else if (!strcmp(key, "attempts")) { ival = atoi(val); if (ival < 0) ival = 0; if (ival > RES_MAXRETRY) ival = RES_MAXRETRY; res->retry = ival; return 0; } else if (!strcmp(key, "v6revmode")) { if (!strcmp(val, "single")) res->options |= RES_NO_NIBBLE2; else if (!strcmp(val, "both")) res->options &= ~RES_NO_NIBBLE2; return 0; } else if (!strcmp(key, "debug")) { res->options |= RES_DEBUG; return 0; } else if (!strcmp(key, "no_tld_query")) { res->options |= RES_NOTLDQUERY; return 0; } else if (!strcmp(key, "inet6")) { res->options |= RES_USE_INET6; return 0; } else if (!strcmp(key, "rotate")) { res->options |= RES_ROTATE; return 0; } else if (!strcmp(key, "no-check-names")) { res->options |= RES_NOCHECKNAME; return 0; } #ifdef RES_USE_EDNS0 else if (!strcmp(key, "edns0")) { res->options |= RES_USE_EDNS0; return 0; } #endif else if (!strcmp(key, "a6")) { res->options |= RES_USE_A6; return 0; } else if (!strcmp(key, "dname")) { res->options |= RES_USE_DNAME; return 0; } return -1; } /* * 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_vinit_from_file(res_state statp, int preinit, char *resconf_file) { 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 isresdefault = 0; unsigned short port; /* HOST BYTE ORDER */ unsigned int i, total_timeout; #ifdef RESOLVSORT int nsort = 0; char *net; #endif int dots; port = NS_DEFAULTPORT; total_timeout = 0; if (!preinit) { statp->retrans = RES_TIMEOUT; statp->retry = RES_DFLRETRY; statp->options = RES_DEFAULT; statp->id = res_randomid(); } if ((statp->options & RES_INIT) != 0) res_ndestroy(statp); /* N.B. we allocate a new statp->_u._ext.ext below */ /* make sure version is set */ statp->_pad = 9; statp->nscount = 0; if ((resconf_file == NULL) || (!strcmp(resconf_file, _PATH_RESCONF))) { isresdefault = 1; #ifdef USELOOPBACK statp->nsaddr.sin_addr = inet_makeaddr(IN_LOOPBACKNET, 1); #else statp->nsaddr.sin_addr.s_addr = INADDR_ANY; #endif statp->nsaddr.sin_family = AF_INET; statp->nsaddr.sin_port = htons(NS_DEFAULTPORT); #ifdef HAVE_SA_LEN statp->nsaddr.sin_len = sizeof(struct sockaddr_in); #endif statp->nscount = 1; /* * Force loopback queries to use TCP * so we don't take a timeout if named isn't running. */ statp->options |= RES_USEVC; } 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 = (struct __res_state_ext *)calloc(1, sizeof(struct __res_state_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"); strcpy(statp->_u._ext.ext->bsuffix, "ip6.arpa"); } #ifdef RESOLVSORT statp->nsort = 0; #endif /* Allow user to override the local domain definition */ cp = getenv("LOCALDOMAIN"); if ((cp != NULL) && (isresdefault != 0)) { (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') break; else if (*cp == ' ' || *cp == '\t') { *cp = 0; n = 1; } else if (n != 0) { *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 (resconf_file == NULL) resconf_file = _PATH_RESCONF; if ((fp = fopen(resconf_file, "r")) != NULL) { /* look for port number */ while (fgets(buf, sizeof(buf), fp) != NULL) { /* skip comments */ if (*buf == ';' || *buf == '#') continue; /* read default domain name */ if (MATCH(buf, "port")) { cp = buf + sizeof("port") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp == '\0') || (*cp == '\n')) continue; port = atoi(cp); break; } } fclose(fp); } if ((fp = fopen(resconf_file, "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")) { /* skip if have from environ */ if (haveenv) 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'; cp = strpbrk(statp->defdname, " \t\n"); if (cp != NULL) *cp = '\0'; havesearch = 0; continue; } /* set search list */ if (MATCH(buf, "search")) { /* skip if have from environ */ if (haveenv) 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'; cp = strchr(statp->defdname, '\n'); if (cp != 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 != 0) { *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)) { #ifndef __APPLE__ struct addrinfo hints, *ai; #endif int dotcount, semicount, status; struct in_addr addr4; struct sockaddr_in sin4; struct in6_addr addr6; struct sockaddr_in6 sin6; unsigned short aport; /* HOST BYTE ORDER */ char *lastdot, *checkp; char sbuf[NI_MAXSERV]; #ifndef __APPLE__ const size_t minsiz = sizeof(statp->_u._ext.ext->nsaddrs[0]); #endif cp = buf + sizeof("nameserver") - 1; while ((*cp == ' ') || (*cp == '\t')) cp++; cp[strcspn(cp, ";# \t\n")] = '\0'; if ((*cp != '\0') && (*cp != '\n')) { #ifndef __APPLE__ memset(&hints, 0, sizeof(hints)); hints.ai_family = PF_UNSPEC; hints.ai_socktype = SOCK_DGRAM; /*dummy*/ hints.ai_flags = AI_NUMERICHOST; #endif dotcount = 0; semicount = 0; lastdot = NULL; aport = port; for (checkp = cp; *checkp != '\0'; checkp++) { if (*checkp == ':') semicount++; else if (*checkp == '.') { dotcount++; lastdot = checkp; } } if ((dotcount == 4) || ((semicount > 0) && (lastdot != NULL))) { aport = atoi(lastdot + 1); if (aport == 0) aport = port; *lastdot = '\0'; } sprintf(sbuf, "%u", aport); #ifdef __APPLE__ memset(&addr4, 0, sizeof(struct in_addr)); memset(&sin4, 0, sizeof(struct sockaddr_in)); memset(&addr6, 0, sizeof(struct in6_addr)); memset(&sin6, 0, sizeof(struct sockaddr_in6)); status = inet_pton(AF_INET6, cp, &addr6); if (status == 1) { sin6.sin6_addr = addr6; sin6.sin6_family = AF_INET6; sin6.sin6_port = htons(aport); sin6.sin6_len = sizeof(struct sockaddr_in6); if (statp->_u._ext.ext != NULL) { memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &sin6, sizeof(struct sockaddr_in6)); } statp->nsaddr_list[nserv].sin_family = 0; nserv++; } else { status = inet_pton(AF_INET, cp, &addr4); if (status == 1) { sin4.sin_addr = addr4; sin4.sin_family = AF_INET; sin4.sin_port = htons(port); sin4.sin_len = sizeof(struct sockaddr_in); if (statp->_u._ext.ext != NULL) { memcpy(&statp->_u._ext.ext->nsaddrs[nserv], &sin4, sizeof(struct sockaddr_in)); } memcpy(&statp->nsaddr_list[nserv], &sin4, sizeof(struct sockaddr_in)); nserv++; } } #else 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++; } #endif } continue; } #ifdef RESOLVSORT 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; } #endif if (MATCH(buf, "options")) { res_setoptions(statp, buf + sizeof("options") - 1, "conf"); continue; } if (MATCH(buf, "timeout")) { cp = buf + sizeof("timeout") - 1; while (*cp == ' ' || *cp == '\t') cp++; if ((*cp == '\0') || (*cp == '\n')) continue; i = atoi(cp); if (i > RES_MAXRETRANS) i = RES_MAXRETRANS; total_timeout = i; continue; } } if (nserv > 1) statp->nscount = nserv; #ifdef RESOLVSORT statp->nsort = nsort; #endif 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 (isresdefault != 0) { 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++) { if (*cp == '.') dots++; } /* Back up over any trailing dots and cut them out of the name */ for (cp--; (cp >= statp->defdname) && (*cp == '.'); cp--) { *cp = '\0'; dots--; } cp = statp->defdname; while (pp < statp->dnsrch + MAXDFLSRCH) { if (dots < LOCALDOMAINPARTS) break; /* we know there is a dot */ cp = strchr(cp, '.') + 1; *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 } cp = getenv("RES_OPTIONS"); if ((cp != NULL) && (isresdefault != 0)) { res_setoptions(statp, cp, "env"); } #ifdef __APPLE__ /* * Post processing to set the timeout value. */ if (total_timeout != 0) { /* Timeout was set with a "timeout" line in the file */ statp->retrans = total_timeout; } else { /* * Timeout is default, or was set with "options timeout:" * This is a per-select timeout value. Calculate total timeout * and set statp->restrans which we (Apple) use to indicate * total time allowed for a query to be resolved. */ total_timeout = statp->retrans * (statp->retry + 1) * statp->nscount; statp->retrans = total_timeout; } #endif 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; } 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 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, "a6", sizeof("a6") - 1)) { statp->options |= RES_USE_A6; } 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, "bitstring:", sizeof("bitstring:") - 1)) { if (ext == NULL) goto skip; cp += sizeof("bitstring:") - 1; i = MIN(strcspn(cp, " \t"), sizeof(ext->bsuffix) - 1); strncpy(ext->bsuffix, cp, i); ext->bsuffix[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++; } } /* This function has to be reachable by res_data.c but not publically. */ int __res_vinit(res_state statp, int preinit) { dns_config_t *sc_dns; dns_resolver_t *sc_res; char val[256], *p, *x; int i, n; uint32_t nsearch, total_timeout, send_timeout; uint16_t port; nsearch = 0; send_timeout = 0; sc_dns = dns_configuration_copy(); if (sc_dns == NULL) return res_vinit_from_file(statp, preinit, _PATH_RESCONF); sc_res = sc_dns->resolver[0]; port = sc_res->port; if (port == 0) port = NS_DEFAULTPORT; if ((statp->options & RES_INIT) != 0) res_ndestroy(statp); /* N.B. res_build_start will allocate statp->_u._ext.ext for us */ statp = res_build_start(statp); p = getenv("RES_RETRY_TIMEOUT"); if (p != NULL) send_timeout = atoi(p); p = getenv("RES_RETRY"); if (p != NULL) statp->retry= atoi(p); if (sc_res->n_nameserver > MAXNS) sc_res->n_nameserver = MAXNS; for (i = 0; i < sc_res->n_nameserver; i++) { if (sc_res->nameserver[i]->sa_family == AF_INET) { memset(val, 0, sizeof(val)); inet_ntop(AF_INET, (char *)(sc_res->nameserver[i]) + INET_NTOP_AF_INET_OFFSET, val, sizeof(val)); res_build(statp, port, &nsearch, "nameserver", val); } else if (sc_res->nameserver[i]->sa_family == AF_INET6) { memset(val, 0, sizeof(val)); inet_ntop(AF_INET6, (char *)(sc_res->nameserver[i]) + INET_NTOP_AF_INET6_OFFSET, val, sizeof(val)); res_build(statp, port, &nsearch, "nameserver", val); } } if (sc_res->n_search > MAXDNSRCH) sc_res->n_search = MAXDNSRCH; for (i = 0; i < sc_res->n_search; i++) { res_build(statp, port, &nsearch, "search", sc_res->search[i]); } /* If there was no search list, use "domain" */ if ((sc_res->n_search == 0) && (sc_res->domain != NULL)) { /* Count dots */ n = 0; for (p = sc_res->domain; *p != '\0'; p++) { if (*p == '.') n++; } /* Back up over any trailing dots and cut them out of the name */ for (p--; (p >= sc_res->domain) && (*p == '.'); p--) { *p = '\0'; n--; } if (p >= sc_res->domain) res_build(statp, port, &nsearch, "search", sc_res->domain); /* dots are separators, so number of components is one larger */ n++; /* Include parent domains with at least LOCALDOMAINPARTS components */ p = sc_res->domain; while ((n > LOCALDOMAINPARTS) && (nsearch < MAXDFLSRCH)) { /* Find next component */ while (*p != '.') p++; if (*p == '\0') break; p++; n--; res_build(statp, port, &nsearch, "search", p); } } total_timeout = sc_res->timeout; snprintf(val, sizeof(val), "%d", sc_res->search_order); res_build(statp, port, &nsearch, "search_order", val); if (sc_res->n_sortaddr > MAXRESOLVSORT) sc_res->n_sortaddr = MAXRESOLVSORT; for (i = 0; i < sc_res->n_sortaddr; i++) { res_build_sortlist(statp, sc_res->sortaddr[i]->address, sc_res->sortaddr[i]->mask); } p = sc_res->options; while (NULL != (x = res_next_word(&p))) { if (!strncmp(x, "ndots:", 6)) { res_build(statp, port, &nsearch, "ndots", x+6); } else if (!strncmp(x, "nibble:", 7)) { res_build(statp, port, &nsearch, "nibble", x+7); } else if (!strncmp(x, "nibble2:", 8)) { res_build(statp, port, &nsearch, "nibble2", x+8); } else if (!strncmp(x, "timeout:", 8)) { send_timeout = atoi(x+8); } else if (!strncmp(x, "attempts:", 9)) { res_build(statp, port, &nsearch, "attempts", x+9); } else if (!strncmp(x, "bitstring:", 10)) { res_build(statp, port, &nsearch, "bitstring", x+10); } else if (!strncmp(x, "v6revmode:", 10)) { res_build(statp, port, &nsearch, "v6revmode", x+10); } else if (!strcmp(x, "debug")) { res_build(statp, port, &nsearch, "debug", NULL); } else if (!strcmp(x, "no_tld_query")) { res_build(statp, port, &nsearch, "no_tld_query", NULL); } else if (!strcmp(x, "inet6")) { res_build(statp, port, &nsearch, "inet6", NULL); } else if (!strcmp(x, "rotate")) { res_build(statp, port, &nsearch, "rotate", NULL); } else if (!strcmp(x, "no-check-names")) { res_build(statp, port, &nsearch, "no-check-names", NULL); } #ifdef RES_USE_EDNS0 else if (!strcmp(x, "edns0")) { res_build(statp, port, &nsearch, "edns0", NULL); } #endif else if (!strcmp(x, "a6")) { res_build(statp, port, &nsearch, "a6", NULL); } else if (!strcmp(x, "dname")) { res_build(statp, port, &nsearch, "dname", NULL); } } n = statp->nscount; if (n == 0) n = 1; if (total_timeout == 0) { if (send_timeout == 0) total_timeout = RES_MAXRETRANS; else total_timeout = send_timeout * statp->retry * n; } dns_configuration_free(sc_dns); res_build_finish(statp, total_timeout, port); return 0; } int res_ninit(res_state statp) { if (statp == NULL) return -1; memset(statp, 0, sizeof(struct __res_state)); return __res_vinit(statp, 0); } #ifdef RESOLVSORT /* 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)); } #endif u_int res_randomid(void) { #ifdef __APPLE__ return arc4random(); #else struct timeval now; gettimeofday(&now, NULL); return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid())); #endif } /* * 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) { close(statp->_vcsock); statp->_vcsock = -1; statp->_flags &= ~(RES_F_VC | RES_F_CONN); } if (statp->_pad >= 9) { for (ns = 0; ns < statp->_u._ext.nscount; ns++) { if (statp->_u._ext.nssocks[ns] != -1) { close(statp->_u._ext.nssocks[ns]); statp->_u._ext.nssocks[ns] = -1; } } } } void res_ndestroy(res_state statp) { res_nclose(statp); statp->options &= ~RES_INIT; /* * _pad (normally unused) is a version number. * We use it to prevent BIND_9 from trashing memory * if statp was created by BIND-8. */ if (statp->_pad >= 9) { if (statp->_u._ext.ext != NULL) free(statp->_u._ext.ext); statp->_u._ext.ext = NULL; statp->_pad = 9; } } 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"); } const char * res_get_bitstringsuffix(res_state statp) { if (statp->_u._ext.ext) return (statp->_u._ext.ext->bsuffix); return ("ip6.arpa"); } 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; 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; 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; 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; default: set->sin.sin_family = 0; break; } set++; } return (statp->nscount); }