/* $NetBSD: getaddrinfo.c,v 1.3 2007/08/07 02:06:59 lukem Exp $ */ /* from ? */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * 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 project 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 PROJECT 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 PROJECT 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. */ /* * Issues to be discussed: * - Thread safe-ness must be checked. * - Return values. There are nonstandard return values defined and used * in the source code. This is because RFC2553 is silent about which error * code must be returned for which situation. * - IPv4 classful (shortened) form. RFC2553 is silent about it. XNET 5.2 * says to use inet_aton() to convert IPv4 numeric to binary (alows * classful form as a result). * current code - disallow classful form for IPv4 (due to use of inet_pton). * - freeaddrinfo(NULL). RFC2553 is silent about it. XNET 5.2 says it is * invalid. * current code - SEGV on freeaddrinfo(NULL) * Note: * - We use getipnodebyname() just for thread-safeness. There's no intent * to let it do PF_UNSPEC (actually we never pass PF_UNSPEC to * getipnodebyname(). * - The code filters out AFs that are not supported by the kernel, * when globbing NULL hostname (to loopback, or wildcard). Is it the right * thing to do? What is the relationship with post-RFC2553 AI_ADDRCONFIG * in ai_flags? * - (post-2553) semantics of AI_ADDRCONFIG itself is too vague. * (1) what should we do against numeric hostname (2) what should we do * against NULL hostname (3) what is AI_ADDRCONFIG itself. AF not ready? * non-loopback address configured? global address configured? * - The code makes use of following calls when asked to resolver with * ai_family = PF_UNSPEC: * getipnodebyname(host, AF_INET6); * getipnodebyname(host, AF_INET); * This will result in the following queries if the node is configure to * prefer /etc/hosts than DNS: * lookup /etc/hosts for IPv6 address * lookup DNS for IPv6 address * lookup /etc/hosts for IPv4 address * lookup DNS for IPv4 address * which may not meet people's requirement. * The right thing to happen is to have underlying layer which does * PF_UNSPEC lookup (lookup both) and return chain of addrinfos. * This would result in a bit of code duplicate with _dns_ghbyname() and * friends. */ #include "tnftp.h" #define SUCCESS 0 #define ANY 0 #define YES 1 #define NO 0 static const char in_addrany[] = { 0, 0, 0, 0 }; static const char in_loopback[] = { 127, 0, 0, 1 }; #ifdef INET6 static const char in6_addrany[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; static const char in6_loopback[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }; #endif static const struct afd { int a_af; int a_addrlen; int a_socklen; int a_off; const char *a_addrany; const char *a_loopback; int a_scoped; } afdl [] = { #ifdef INET6 {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6), offsetof(struct sockaddr_in6, sin6_addr), in6_addrany, in6_loopback, 1}, #endif {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in), offsetof(struct sockaddr_in, sin_addr), in_addrany, in_loopback, 0}, {0, 0, 0, 0, NULL, NULL, 0}, }; struct explore { int e_af; int e_socktype; int e_protocol; const char *e_protostr; int e_wild; #define WILD_AF(ex) ((ex)->e_wild & 0x01) #define WILD_SOCKTYPE(ex) ((ex)->e_wild & 0x02) #define WILD_PROTOCOL(ex) ((ex)->e_wild & 0x04) }; static const struct explore explore[] = { #if 0 { PF_LOCAL, 0, ANY, ANY, NULL, 0x01 }, #endif #ifdef INET6 { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 }, #endif { PF_INET, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, { PF_INET, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, { PF_INET, SOCK_RAW, ANY, NULL, 0x05 }, { -1, 0, 0, NULL, 0 }, }; #ifdef INET6 #define PTON_MAX 16 #else #define PTON_MAX 4 #endif static int str_isnumber(const char *); static int explore_fqdn(const struct addrinfo *, const char *, const char *, struct addrinfo **); static int explore_null(const struct addrinfo *, const char *, struct addrinfo **); static int explore_numeric(const struct addrinfo *, const char *, const char *, struct addrinfo **); static int explore_numeric_scope(const struct addrinfo *, const char *, const char *, struct addrinfo **); static int get_canonname(const struct addrinfo *, struct addrinfo *, const char *); static struct addrinfo *get_ai(const struct addrinfo *, const struct afd *, const char *); static int get_portmatch(const struct addrinfo *, const char *); static int get_port(struct addrinfo *, const char *, int); static const struct afd *find_afd(int); static int addrconfig(const struct addrinfo *); #ifdef INET6 static int ip6_str2scopeid(char *, struct sockaddr_in6 *); #endif static char *ai_errlist[] = { "Success", "Address family for hostname not supported", /* EAI_ADDRFAMILY */ "Temporary failure in name resolution", /* EAI_AGAIN */ "Invalid value for ai_flags", /* EAI_BADFLAGS */ "Non-recoverable failure in name resolution", /* EAI_FAIL */ "ai_family not supported", /* EAI_FAMILY */ "Memory allocation failure", /* EAI_MEMORY */ "No address associated with hostname", /* EAI_NODATA */ "hostname nor servname provided, or not known", /* EAI_NONAME */ "servname not supported for ai_socktype", /* EAI_SERVICE */ "ai_socktype not supported", /* EAI_SOCKTYPE */ "System error returned in errno", /* EAI_SYSTEM */ "Invalid value for hints", /* EAI_BADHINTS */ "Resolved protocol is unknown", /* EAI_PROTOCOL */ "Unknown error", /* EAI_MAX */ }; /* XXX macros that make external reference is BAD. */ #define GET_AI(ai, afd, addr) \ do { \ /* external reference: pai, error, and label free */ \ (ai) = get_ai(pai, (afd), (addr)); \ if ((ai) == NULL) { \ error = EAI_MEMORY; \ goto free; \ } \ } while (/*CONSTCOND*/0) #define GET_PORT(ai, serv) \ do { \ /* external reference: error and label free */ \ error = get_port((ai), (serv), 0); \ if (error != 0) \ goto free; \ } while (/*CONSTCOND*/0) #define GET_CANONNAME(ai, str) \ do { \ /* external reference: pai, error and label free */ \ error = get_canonname(pai, (ai), (str)); \ if (error != 0) \ goto free; \ } while (/*CONSTCOND*/0) #define ERR(err) \ do { \ /* external reference: error, and label bad */ \ error = (err); \ goto bad; \ /*NOTREACHED*/ \ } while (/*CONSTCOND*/0) #define MATCH_FAMILY(x, y, w) \ ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC))) #define MATCH(x, y, w) \ ((x) == (y) || (/*CONSTCOND*/(w) && ((x) == ANY || (y) == ANY))) const char * gai_strerror(int ecode) { if (ecode < 0 || ecode > EAI_MAX) ecode = EAI_MAX; return ai_errlist[ecode]; } void freeaddrinfo(struct addrinfo *ai) { struct addrinfo *next; do { next = ai->ai_next; if (ai->ai_canonname) free(ai->ai_canonname); /* no need to free(ai->ai_addr) */ free(ai); ai = next; } while (ai); } static int str_isnumber(const char *p) { char *ep; long l; if (*p == '\0') return NO; ep = NULL; l = strtol(p, &ep, 10); if (ep && *ep == '\0' && l >= 0) return YES; else return NO; } int getaddrinfo(const char *hostname, const char *servname, const struct addrinfo *hints, struct addrinfo **res) { struct addrinfo sentinel; struct addrinfo *cur; int error = 0; struct addrinfo ai; struct addrinfo ai0; struct addrinfo *pai; const struct afd *afd; const struct explore *ex; memset(&sentinel, 0, sizeof(sentinel)); cur = &sentinel; pai = &ai; pai->ai_flags = 0; pai->ai_family = PF_UNSPEC; pai->ai_socktype = ANY; pai->ai_protocol = ANY; pai->ai_addrlen = 0; pai->ai_canonname = NULL; pai->ai_addr = NULL; pai->ai_next = NULL; if (hostname == NULL && servname == NULL) return EAI_NONAME; if (hints) { /* error check for hints */ if (hints->ai_addrlen || hints->ai_canonname || hints->ai_addr || hints->ai_next) ERR(EAI_BADHINTS); /* xxx */ if (hints->ai_flags & ~AI_MASK) ERR(EAI_BADFLAGS); switch (hints->ai_family) { case PF_UNSPEC: case PF_INET: #ifdef INET6 case PF_INET6: #endif break; default: ERR(EAI_FAMILY); } memcpy(pai, hints, sizeof(*pai)); /* * if both socktype/protocol are specified, check if they * are meaningful combination. */ if (pai->ai_socktype != ANY && pai->ai_protocol != ANY) { for (ex = explore; ex->e_af >= 0; ex++) { if (pai->ai_family != ex->e_af) continue; if (ex->e_socktype == ANY) continue; if (ex->e_protocol == ANY) continue; if (pai->ai_socktype == ex->e_socktype && pai->ai_protocol != ex->e_protocol) { ERR(EAI_BADHINTS); } } } } /* * post-2553: AI_ALL and AI_V4MAPPED are effective only against * AF_INET6 query. They needs to be ignored if specified in other * occassions. */ switch (pai->ai_flags & (AI_ALL | AI_V4MAPPED)) { case AI_V4MAPPED: case AI_ALL | AI_V4MAPPED: #ifdef INET6 /* XXXLUKEM */ if (pai->ai_family != AF_INET6) pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); break; #endif case AI_ALL: #if 1 /* illegal */ ERR(EAI_BADFLAGS); #else pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); #endif break; } /* * check for special cases. (1) numeric servname is disallowed if * socktype/protocol are left unspecified. (2) servname is disallowed * for raw and other inet{,6} sockets. */ if (MATCH_FAMILY(pai->ai_family, PF_INET, 1) #ifdef PF_INET6 || MATCH_FAMILY(pai->ai_family, PF_INET6, 1) #endif ) { ai0 = *pai; /* backup *pai */ if (pai->ai_family == PF_UNSPEC) { #ifdef PF_INET6 pai->ai_family = PF_INET6; #else pai->ai_family = PF_INET; #endif } error = get_portmatch(pai, servname); if (error) ERR(error); *pai = ai0; } ai0 = *pai; /* NULL hostname, or numeric hostname */ for (ex = explore; ex->e_af >= 0; ex++) { *pai = ai0; if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex))) continue; if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex))) continue; if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex))) continue; if (pai->ai_family == PF_UNSPEC) pai->ai_family = ex->e_af; if (pai->ai_socktype == ANY && ex->e_socktype != ANY) pai->ai_socktype = ex->e_socktype; if (pai->ai_protocol == ANY && ex->e_protocol != ANY) pai->ai_protocol = ex->e_protocol; if (hostname == NULL) error = explore_null(pai, servname, &cur->ai_next); else error = explore_numeric_scope(pai, hostname, servname, &cur->ai_next); if (error) goto free; while (cur && cur->ai_next) cur = cur->ai_next; } /* * XXX * If numreic representation of AF1 can be interpreted as FQDN * representation of AF2, we need to think again about the code below. */ if (sentinel.ai_next) goto good; if (pai->ai_flags & AI_NUMERICHOST) ERR(EAI_NODATA); if (hostname == NULL) ERR(EAI_NODATA); /* * hostname as alphabetical name. * we would like to prefer AF_INET6 than AF_INET, so we'll make a * outer loop by AFs. */ for (afd = afdl; afd->a_af; afd++) { *pai = ai0; if (!MATCH_FAMILY(pai->ai_family, afd->a_af, 1)) continue; for (ex = explore; ex->e_af >= 0; ex++) { *pai = ai0; if (pai->ai_family == PF_UNSPEC) pai->ai_family = afd->a_af; if (!MATCH_FAMILY(pai->ai_family, ex->e_af, WILD_AF(ex))) continue; if (!MATCH(pai->ai_socktype, ex->e_socktype, WILD_SOCKTYPE(ex))) { continue; } if (!MATCH(pai->ai_protocol, ex->e_protocol, WILD_PROTOCOL(ex))) { continue; } if (pai->ai_family == PF_UNSPEC) pai->ai_family = ex->e_af; if (pai->ai_socktype == ANY && ex->e_socktype != ANY) pai->ai_socktype = ex->e_socktype; if (pai->ai_protocol == ANY && ex->e_protocol != ANY) pai->ai_protocol = ex->e_protocol; error = explore_fqdn(pai, hostname, servname, &cur->ai_next); while (cur && cur->ai_next) cur = cur->ai_next; } } /* XXX */ if (sentinel.ai_next) error = 0; if (error) goto free; if (error == 0) { if (sentinel.ai_next) { good: *res = sentinel.ai_next; return SUCCESS; } else error = EAI_FAIL; } free: bad: if (sentinel.ai_next) freeaddrinfo(sentinel.ai_next); *res = NULL; return error; } /* * FQDN hostname, DNS lookup */ static int explore_fqdn(const struct addrinfo *pai, const char *hostname, const char *servname, struct addrinfo **res) { struct hostent *hp; int h_error; int af; char **aplist = NULL, *apbuf = NULL; char *ap; struct addrinfo sentinel, *cur; int i; #ifndef USE_GETIPNODEBY int naddrs; #endif const struct afd *afd; int error = 0; #if 0 struct addrinfo pai4; #ifdef INET6 struct addrinfo pai6; #endif #endif *res = NULL; sentinel.ai_next = NULL; cur = &sentinel; /* * If AI_ADDRCONFIG is specified, check if we are expected to * return the address family or not. * assumes PF_UNSPEC = PF_INET + PF_INET6. * * NOTE: PF_UNSPEC case is for future use. */ if ((pai->ai_flags & AI_ADDRCONFIG) != 0) { switch (pai->ai_family) { #if 0 case PF_UNSPEC: pai4 = pai6 = *pai; pai4.ai_family = PF_INET; #ifndef INET6 if (!addrconfig(&pai4)) return 0; #else pai6.ai_family = PF_INET6; if (!addrconfig(&pai4)) { if (!addrconfig(&pai6)) return 0; pai = &pai6; } else { if (!addrconfig(&pai6)) pai = &pai4; else ; /* as is */ } #endif break; #endif default: if (!addrconfig(pai)) return 0; break; } } /* * if the servname does not match socktype/protocol, ignore it. */ if (get_portmatch(pai, servname) != 0) return 0; afd = find_afd(pai->ai_family); if (afd == NULL) return 0; #ifdef USE_GETIPNODEBY hp = getipnodebyname(hostname, pai->ai_family, pai->ai_flags & AI_ADDRCONFIG, &h_error); #else #if defined(HAVE_GETHOSTBYNAME2) hp = gethostbyname2(hostname, pai->ai_family); #else if (pai->ai_family != AF_INET) return 0; hp = gethostbyname(hostname); #endif /* defined(HAVE_GETHOSTBYNAME2) */ #if defined(HAVE_H_ERRNO) h_error = h_errno; #else h_error = EINVAL; #endif #endif /*USE_GETIPNODEBY*/ if (hp == NULL) { switch (h_error) { case HOST_NOT_FOUND: case NO_DATA: error = EAI_NODATA; break; case TRY_AGAIN: error = EAI_AGAIN; break; case NO_RECOVERY: #ifdef NETDB_INTERNAL case NETDB_INTERNAL: #endif default: error = EAI_FAIL; break; } } else if ((hp->h_name == NULL) || (hp->h_name[0] == 0) || (hp->h_addr_list[0] == NULL)) { #ifdef USE_GETIPNODEBY freehostent(hp); #endif hp = NULL; error = EAI_FAIL; } if (hp == NULL) goto free; #ifdef USE_GETIPNODEBY aplist = hp->h_addr_list; #else /* * hp will be overwritten if we use gethostbyname2(). * always deep copy for simplification. */ for (naddrs = 0; hp->h_addr_list[naddrs] != NULL; naddrs++) ; naddrs++; aplist = (char **)malloc(sizeof(aplist[0]) * naddrs); apbuf = (char *)malloc((size_t)hp->h_length * naddrs); if (aplist == NULL || apbuf == NULL) { error = EAI_MEMORY; goto free; } memset(aplist, 0, sizeof(aplist[0]) * naddrs); for (i = 0; i < naddrs; i++) { if (hp->h_addr_list[i] == NULL) { aplist[i] = NULL; continue; } memcpy(&apbuf[i * hp->h_length], hp->h_addr_list[i], (size_t)hp->h_length); aplist[i] = &apbuf[i * hp->h_length]; } #endif for (i = 0; aplist[i] != NULL; i++) { af = hp->h_addrtype; ap = aplist[i]; #ifdef INET6 if (af == AF_INET6 && IN6_IS_ADDR_V4MAPPED((struct in6_addr *)ap)) { af = AF_INET; ap = ap + sizeof(struct in6_addr) - sizeof(struct in_addr); } #endif if (af != pai->ai_family) continue; GET_AI(cur->ai_next, afd, ap); GET_PORT(cur->ai_next, servname); if ((pai->ai_flags & AI_CANONNAME) != 0) { /* * RFC2553 says that ai_canonname will be set only for * the first element. we do it for all the elements, * just for convenience. */ GET_CANONNAME(cur->ai_next, hp->h_name); } while (cur && cur->ai_next) cur = cur->ai_next; } *res = sentinel.ai_next; return 0; free: #ifdef USE_GETIPNODEBY if (hp) freehostent(hp); #endif if (aplist) free(aplist); if (apbuf) free(apbuf); if (sentinel.ai_next) freeaddrinfo(sentinel.ai_next); return error; } /* * hostname == NULL. * passive socket -> anyaddr (0.0.0.0 or ::) * non-passive socket -> localhost (127.0.0.1 or ::1) */ static int explore_null(const struct addrinfo *pai, const char *servname, struct addrinfo **res) { const struct afd *afd; struct addrinfo *cur; struct addrinfo sentinel; int error; *res = NULL; sentinel.ai_next = NULL; cur = &sentinel; /* * filter out AFs that are not supported by the kernel * XXX errno? */ if (!addrconfig(pai)) return 0; /* * if the servname does not match socktype/protocol, ignore it. */ if (get_portmatch(pai, servname) != 0) return 0; afd = find_afd(pai->ai_family); if (afd == NULL) return 0; if (pai->ai_flags & AI_PASSIVE) { GET_AI(cur->ai_next, afd, afd->a_addrany); /* xxx meaningless? * GET_CANONNAME(cur->ai_next, "anyaddr"); */ GET_PORT(cur->ai_next, servname); } else { GET_AI(cur->ai_next, afd, afd->a_loopback); /* xxx meaningless? * GET_CANONNAME(cur->ai_next, "localhost"); */ GET_PORT(cur->ai_next, servname); } cur = cur->ai_next; *res = sentinel.ai_next; return 0; free: if (sentinel.ai_next) freeaddrinfo(sentinel.ai_next); return error; } /* * numeric hostname */ static int explore_numeric(const struct addrinfo *pai, const char *hostname, const char *servname, struct addrinfo **res) { const struct afd *afd; struct addrinfo *cur; struct addrinfo sentinel; int error; char pton[PTON_MAX]; *res = NULL; sentinel.ai_next = NULL; cur = &sentinel; /* * if the servname does not match socktype/protocol, ignore it. */ if (get_portmatch(pai, servname) != 0) return 0; afd = find_afd(pai->ai_family); if (afd == NULL) return 0; switch (afd->a_af) { #if 0 /*X/Open spec*/ case AF_INET: if (inet_aton(hostname, (struct in_addr *)pton) == 1) { if (pai->ai_family == afd->a_af || pai->ai_family == PF_UNSPEC /*?*/) { GET_AI(cur->ai_next, afd, pton); GET_PORT(cur->ai_next, servname); while (cur && cur->ai_next) cur = cur->ai_next; } else ERR(EAI_FAMILY); /*xxx*/ } break; #endif default: if (inet_pton(afd->a_af, hostname, pton) == 1) { if (pai->ai_family == afd->a_af || pai->ai_family == PF_UNSPEC /*?*/) { GET_AI(cur->ai_next, afd, pton); GET_PORT(cur->ai_next, servname); while (cur && cur->ai_next) cur = cur->ai_next; } else ERR(EAI_FAMILY); /*xxx*/ } break; } *res = sentinel.ai_next; return 0; free: bad: if (sentinel.ai_next) freeaddrinfo(sentinel.ai_next); return error; } /* * numeric hostname with scope */ static int explore_numeric_scope(const struct addrinfo *pai, const char *hostname, const char *servname, struct addrinfo **res) { #if !defined(SCOPE_DELIMITER) || !defined(INET6) return explore_numeric(pai, hostname, servname, res); #else const struct afd *afd; struct addrinfo *cur; int error; char *cp, *hostname2 = NULL, *scope, *addr; struct sockaddr_in6 *sin6; /* * if the servname does not match socktype/protocol, ignore it. */ if (get_portmatch(pai, servname) != 0) return 0; afd = find_afd(pai->ai_family); if (afd == NULL) return 0; if (!afd->a_scoped) return explore_numeric(pai, hostname, servname, res); cp = strchr(hostname, SCOPE_DELIMITER); if (cp == NULL) return explore_numeric(pai, hostname, servname, res); #if 0 /* * Handle special case of */ hostname2 = strdup(hostname); if (hostname2 == NULL) return EAI_MEMORY; /* terminate at the delimiter */ hostname2[cp - hostname] = '\0'; scope = hostname2; addr = cp + 1; #else /* * Handle special case of */ hostname2 = strdup(hostname); if (hostname2 == NULL) return EAI_MEMORY; /* terminate at the delimiter */ hostname2[cp - hostname] = '\0'; addr = hostname2; scope = cp + 1; #endif error = explore_numeric(pai, addr, servname, res); if (error == 0) { int scopeid; for (cur = *res; cur; cur = cur->ai_next) { if (cur->ai_family != AF_INET6) continue; sin6 = (struct sockaddr_in6 *)(void *)cur->ai_addr; if ((scopeid = ip6_str2scopeid(scope, sin6)) == -1) { free(hostname2); return(EAI_NODATA); /* XXX: is return OK? */ } sin6->sin6_scope_id = scopeid; } } free(hostname2); return error; #endif } static int get_canonname(const struct addrinfo *pai, struct addrinfo *ai, const char *str) { if ((pai->ai_flags & AI_CANONNAME) != 0) { ai->ai_canonname = (char *)malloc(strlen(str) + 1); if (ai->ai_canonname == NULL) return EAI_MEMORY; strcpy(ai->ai_canonname, str); } return 0; } static struct addrinfo * get_ai(const struct addrinfo *pai, const struct afd *afd, const char *addr) { char *p; struct addrinfo *ai; ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + (afd->a_socklen)); if (ai == NULL) return NULL; memcpy(ai, pai, sizeof(struct addrinfo)); ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); memset(ai->ai_addr, 0, (size_t)afd->a_socklen); #if defined(HAVE_STRUCT_SOCKADDR_SA_LEN) ai->ai_addr->sa_len = afd->a_socklen; #endif ai->ai_addrlen = afd->a_socklen; ai->ai_addr->sa_family = ai->ai_family = afd->a_af; p = (char *)(void *)(ai->ai_addr); memcpy(p + afd->a_off, addr, (size_t)afd->a_addrlen); return ai; } static int get_portmatch(const struct addrinfo *ai, const char *servname) { /* get_port does not touch first argument. when matchonly == 1. */ /* LINTED const cast */ return get_port((struct addrinfo *)ai, servname, 1); } static int get_port(struct addrinfo *ai, const char *servname, int matchonly) { const char *proto; struct servent *sp; int port; int allownumeric; if (servname == NULL) return 0; switch (ai->ai_family) { case AF_INET: #ifdef AF_INET6 case AF_INET6: #endif break; default: return 0; } switch (ai->ai_socktype) { case SOCK_RAW: return EAI_SERVICE; case SOCK_DGRAM: case SOCK_STREAM: allownumeric = 1; break; case ANY: allownumeric = 0; break; default: return EAI_SOCKTYPE; } if (str_isnumber(servname)) { if (!allownumeric) return EAI_SERVICE; port = htons(atoi(servname)); if (port < 0 || port > 65535) return EAI_SERVICE; } else { switch (ai->ai_socktype) { case SOCK_DGRAM: proto = "udp"; break; case SOCK_STREAM: proto = "tcp"; break; default: proto = NULL; break; } if ((sp = getservbyname(servname, proto)) == NULL) return EAI_SERVICE; port = sp->s_port; } if (!matchonly) { switch (ai->ai_family) { case AF_INET: ((struct sockaddr_in *)(void *) ai->ai_addr)->sin_port = port; break; #ifdef INET6 case AF_INET6: ((struct sockaddr_in6 *)(void *) ai->ai_addr)->sin6_port = port; break; #endif } } return 0; } static const struct afd * find_afd(int af) { const struct afd *afd; if (af == PF_UNSPEC) return NULL; for (afd = afdl; afd->a_af; afd++) { if (afd->a_af == af) return afd; } return NULL; } /* * post-2553: AI_ADDRCONFIG check. if we use getipnodeby* as backend, backend * will take care of it. * the semantics of AI_ADDRCONFIG is not defined well. we are not sure * if the code is right or not. */ static int addrconfig(const struct addrinfo *pai) { #ifdef USE_GETIPNODEBY return 1; #else int s; /* XXX errno */ s = socket(pai->ai_family, SOCK_DGRAM, 0); if (s < 0) { if (errno != EMFILE) return 0; } else close(s); return 1; #endif } #ifdef INET6 /* convert a string to a scope identifier. XXX: IPv6 specific */ static int ip6_str2scopeid(char *scope, struct sockaddr_in6 *sin6) { int scopeid; struct in6_addr *a6 = &sin6->sin6_addr; char *ep; /* empty scopeid portion is invalid */ if (*scope == '\0') return -1; if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) { /* * We currently assume a one-to-one mapping between links * and interfaces, so we simply use interface indices for * like-local scopes. */ scopeid = if_nametoindex(scope); if (scopeid == 0) goto trynumeric; return(scopeid); } /* still unclear about literal, allow numeric only - placeholder */ if (IN6_IS_ADDR_SITELOCAL(a6) || IN6_IS_ADDR_MC_SITELOCAL(a6)) goto trynumeric; if (IN6_IS_ADDR_MC_ORGLOCAL(a6)) goto trynumeric; else goto trynumeric; /* global */ /* try to convert to a numeric id as a last resort */ trynumeric: scopeid = (int)strtoul(scope, &ep, 10); if (*ep == '\0') return scopeid; else return -1; } #endif