diff options
Diffstat (limited to 'lib/libc/net/getaddrinfo.c')
| -rw-r--r-- | lib/libc/net/getaddrinfo.c | 1014 |
1 files changed, 1014 insertions, 0 deletions
diff --git a/lib/libc/net/getaddrinfo.c b/lib/libc/net/getaddrinfo.c new file mode 100644 index 0000000..79b07de --- /dev/null +++ b/lib/libc/net/getaddrinfo.c @@ -0,0 +1,1014 @@ +/* + * 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. + * + * $FreeBSD$ + */ + +/* + * "#ifdef FAITH" part is local hack for supporting IPv4-v6 translator. + * + * 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. + * - PF_UNSPEC case would be handled in getipnodebyname() with the AI_ALL flag. + */ + +#include <sys/types.h> +#include <sys/param.h> +#include <sys/socket.h> +#include <net/if.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <arpa/nameser.h> +#include <netdb.h> +#include <resolv.h> +#include <string.h> +#include <stdlib.h> +#include <stddef.h> +#include <ctype.h> +#include <unistd.h> +#include <stdio.h> + +#if defined(__KAME__) && defined(INET6) +# define FAITH +#endif + +#define SUCCESS 0 +#define ANY 0 +#define YES 1 +#define NO 0 + +static const char in_addrany[] = { 0, 0, 0, 0 }; +static const char in6_addrany[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; +static const char in_loopback[] = { 127, 0, 0, 1 }; +static const char in6_loopback[] = { + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 +}; + +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 +#define N_INET6 0 + {PF_INET6, sizeof(struct in6_addr), + sizeof(struct sockaddr_in6), + offsetof(struct sockaddr_in6, sin6_addr), + in6_addrany, in6_loopback, 1}, +#define N_INET 1 +#else +#define N_INET 0 +#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[] = { +#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 __P((const char *)); +static int explore_fqdn __P((const struct addrinfo *, const char *, + const char *, struct addrinfo **)); +static int explore_null __P((const struct addrinfo *, const char *, + const char *, struct addrinfo **)); +static int explore_numeric __P((const struct addrinfo *, const char *, + const char *, struct addrinfo **)); +static int explore_numeric_scope __P((const struct addrinfo *, const char *, + const char *, struct addrinfo **)); +static int get_name __P((const char *, const struct afd *, struct addrinfo **, + char *, const struct addrinfo *, const char *)); +static int get_canonname __P((const struct addrinfo *, + struct addrinfo *, const char *)); +static struct addrinfo *get_ai __P((const struct addrinfo *, + const struct afd *, const char *)); +static int get_portmatch __P((const struct addrinfo *, const char *)); +static int get_port __P((struct addrinfo *, const char *, int)); +static const struct afd *find_afd __P((int)); + +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 */ + "Argument res is NULL", /* EAI_RESNULL */ + "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 (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 (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 (0) + +#define ERR(err) \ +do { \ + /* external reference: error, and label bad */ \ + error = (err); \ + goto bad; \ +} while (0) + +#define MATCH_FAMILY(x, y, w) \ + ((x) == (y) || ((w) && ((x) == PF_UNSPEC || (y) == PF_UNSPEC))) +#define MATCH(x, y, w) \ + ((x) == (y) || ((w) && ((x) == ANY || (y) == ANY))) + +char * +gai_strerror(ecode) + int ecode; +{ + if (ecode < 0 || ecode > EAI_MAX) + ecode = EAI_MAX; + return ai_errlist[ecode]; +} + +void +freeaddrinfo(ai) + 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); + } while ((ai = next) != NULL); +} + +static int +str_isnumber(p) + const char *p; +{ + char *q = (char *)p; + while (*q) { + if (! isdigit(*q)) + return NO; + q++; + } + return YES; +} + +int +getaddrinfo(hostname, servname, hints, res) + const char *hostname, *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; + + sentinel.ai_next = NULL; + 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 (res == NULL) + return EAI_RESNULL; /* xxx */ + 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) { + int matched = 0; + + 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) + matched = 1; + else + continue; + if (matched == 0) + ERR(EAI_BADHINTS); + } + } + } + + /* backup original pai contents */ + ai0 = *pai; + + /* + * special cases check for inet and inet6 sockets. + * (1) servname is disallowed for raw sockets. + * (2) numeric servname is disallowed if socktype/protocol is left + * unspecified. + */ + if (MATCH_FAMILY(pai->ai_family, PF_INET, 1) +#ifdef INET6 + || MATCH_FAMILY(pai->ai_family, PF_INET6, 1) +#endif + ) { + *pai = ai0; + + if (pai->ai_family == PF_UNSPEC) +#ifdef INET6 + pai->ai_family = PF_INET6; +#else + pai->ai_family = PF_INET; +#endif + error = get_portmatch(pai, servname); + if (error) + ERR(error); + } + + /* 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, hostname, 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_NONAME); + if (hostname == NULL) + ERR(EAI_NONAME); + + /* + * 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 any addrinfo found, SUCCESS return even if (error != 0) */ + if (sentinel.ai_next) { + good: + *res = sentinel.ai_next; + return SUCCESS; + } + /* else, failed */ + free: + bad: + if (error == 0) + error = EAI_FAIL; + if (sentinel.ai_next) + freeaddrinfo(sentinel.ai_next); + *res = NULL; + return error; +} + +/* + * FQDN hostname, DNS lookup + */ +static int +explore_fqdn(pai, hostname, servname, res) + const struct addrinfo *pai; + const char *hostname; + const char *servname; + struct addrinfo **res; +{ + int s; + struct hostent *hp; + int h_error; + int af; + char *ap; + struct addrinfo sentinel, *cur; + int i; + const struct afd *afd; + int error; + + *res = NULL; + sentinel.ai_next = NULL; + cur = &sentinel; + + /* + * filter out AFs that are not supported by the kernel + * XXX errno? + */ + s = socket(pai->ai_family, SOCK_DGRAM, 0); + if (s < 0) + return 0; + close(s); + + /* + * 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; + + hp = getipnodebyname(hostname, pai->ai_family, AI_ADDRCONFIG, + &h_error); + 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: + case NETDB_INTERNAL: + default: + error = EAI_FAIL; + break; + } + } else if ((hp->h_name == NULL) || (hp->h_name[0] == 0) + || (hp->h_addr_list[0] == NULL)) { + freehostent(hp); + hp = NULL; + error = EAI_FAIL; + } + + if (hp == NULL) + goto free; + + for (i = 0; hp->h_addr_list[i] != NULL; i++) { + af = hp->h_addrtype; + ap = hp->h_addr_list[i]; + + if (af != pai->ai_family) + continue; + + if ((pai->ai_flags & AI_CANONNAME) == 0) { + GET_AI(cur->ai_next, afd, ap); + GET_PORT(cur->ai_next, servname); + } else { + /* + * if AI_CANONNAME and if reverse lookup + * fail, return ai anyway to pacify + * calling application. + * + * XXX getaddrinfo() is a name->address + * translation function, and it looks + * strange that we do addr->name + * translation here. + */ + get_name(ap, afd, &cur->ai_next, + ap, pai, servname); + } + + while (cur && cur->ai_next) + cur = cur->ai_next; + } + + *res = sentinel.ai_next; + return 0; + +free: + if (hp) + freehostent(hp); + 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(pai, hostname, servname, res) + const struct addrinfo *pai; + const char *hostname; + const char *servname; + struct addrinfo **res; +{ + int s; + 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? + */ + s = socket(pai->ai_family, SOCK_DGRAM, 0); + if (s < 0) + return 0; + close(s); + afd = find_afd(pai->ai_family); + if (afd == NULL) + return 0; + + GET_AI(cur->ai_next, afd, + (pai->ai_flags & AI_PASSIVE) ? afd->a_addrany : afd->a_loopback + ); + /* xxx meaningless? + * GET_CANONNAME(cur->ai_next, "anyaddr"); + * or + * GET_CANONNAME(cur->ai_next, "localhost"); + */ + /* if the servname does not match socktype/protocol, ignored */ + GET_PORT(cur->ai_next, servname); + + *res = sentinel.ai_next; + return 0; + +free: + if (sentinel.ai_next) + freeaddrinfo(sentinel.ai_next); + return error; +} + +/* + * numeric hostname + */ +static int +explore_numeric(pai, hostname, servname, res) + 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]; + int flags; + + *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; + flags = pai->ai_flags; + + if (inet_pton(afd->a_af, hostname, pton) == 1) { + u_int32_t v4a; +#ifdef INET6 + struct in6_addr * v6a; +#endif + + switch (afd->a_af) { + case AF_INET: + v4a = (u_int32_t)ntohl(((struct in_addr *)pton)->s_addr); + if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a)) + flags &= ~AI_CANONNAME; + v4a >>= IN_CLASSA_NSHIFT; + if (v4a == 0 || v4a == IN_LOOPBACKNET) + flags &= ~AI_CANONNAME; + break; +#ifdef INET6 + case AF_INET6: + v6a = (struct in6_addr *)pton; + if (IN6_IS_ADDR_MULTICAST(v6a)) + flags &= ~AI_CANONNAME; + if (IN6_IS_ADDR_UNSPECIFIED(v6a) || + IN6_IS_ADDR_LOOPBACK(v6a)) + flags &= ~AI_CANONNAME; + if (IN6_IS_ADDR_LINKLOCAL(v6a)) + flags &= ~AI_CANONNAME; + + /* should also do this for SITELOCAL ?? */ + + break; +#endif + } + + if (pai->ai_family == afd->a_af || + pai->ai_family == PF_UNSPEC /*?*/) { + if ((flags & AI_CANONNAME) == 0) { + GET_AI(cur->ai_next, afd, pton); + GET_PORT(cur->ai_next, servname); + } else { + /* + * if AI_CANONNAME and if reverse lookup + * fail, return ai anyway to pacify + * calling application. + * + * XXX getaddrinfo() is a name->address + * translation function, and it looks + * strange that we do addr->name + * translation here. + */ + get_name(pton, afd, &cur->ai_next, + pton, pai, servname); + } + while (cur && cur->ai_next) + cur = cur->ai_next; + } else + ERR(EAI_FAMILY); /*xxx*/ + } + + *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(pai, hostname, servname, res) + const struct addrinfo *pai; + const char *hostname; + const char *servname; + struct addrinfo **res; +{ +#ifndef SCOPE_DELIMITER + return explore_numeric(pai, hostname, servname, res); +#else + const struct afd *afd; + struct addrinfo *cur; + int error; + char *cp, *hostname2 = NULL; + int scope; +#ifdef INET6 + struct sockaddr_in6 *sin6; +#endif + + /* + * 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); + + /* + * Handle special case of <scoped_address><delimiter><scope id> + */ + hostname2 = strdup(hostname); + if (hostname2 == NULL) + return EAI_MEMORY; + /* terminate at the delimiter */ + hostname2[cp - hostname] = '\0'; + + cp++; + switch (pai->ai_family) { +#ifdef INET6 + case AF_INET6: + scope = if_nametoindex(cp); + break; +#endif + } + + error = explore_numeric(pai, hostname2, servname, res); + if (error == 0) { + for (cur = *res; cur; cur = cur->ai_next) { +#ifdef INET6 + if (cur->ai_family != AF_INET6) + continue; + sin6 = (struct sockaddr_in6 *)cur->ai_addr; + if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) || + IN6_IS_ADDR_MC_LINKLOCAL(&sin6->sin6_addr)) + sin6->sin6_scope_id = scope; +#endif + } + } + + free(hostname2); + + return error; +#endif +} + +static int +get_name(addr, afd, res, numaddr, pai, servname) + const char *addr; + const struct afd *afd; + struct addrinfo **res; + char *numaddr; + const struct addrinfo *pai; + const char *servname; +{ + struct hostent *hp; + struct addrinfo *cur; + int error = 0; + int h_error; + + hp = getipnodebyaddr(addr, afd->a_addrlen, afd->a_af, &h_error); + if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { + GET_AI(cur, afd, hp->h_addr_list[0]); + GET_PORT(cur, servname); + GET_CANONNAME(cur, hp->h_name); + } else { + GET_AI(cur, afd, numaddr); + GET_PORT(cur, servname); + } + + if (hp) + freehostent(hp); + *res = cur; + return SUCCESS; + free: + if (cur) + freeaddrinfo(cur); + if (hp) + freehostent(hp); + /* bad: */ + *res = NULL; + return error; +} + +static int +get_canonname(pai, ai, str) + 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(pai, afd, addr) + const struct addrinfo *pai; + const struct afd *afd; + const char *addr; +{ + char *p; + struct addrinfo *ai; +#ifdef FAITH + struct in6_addr faith_prefix; + char *fp_str; + int translate = 0; +#endif + +#ifdef FAITH + /* + * Transfrom an IPv4 addr into a special IPv6 addr format for + * IPv6->IPv4 translation gateway. (only TCP is supported now) + * + * +-----------------------------------+------------+ + * | faith prefix part (12 bytes) | embedded | + * | | IPv4 addr part (4 bytes) + * +-----------------------------------+------------+ + * + * faith prefix part is specified as ascii IPv6 addr format + * in environmental variable GAI. + * For FAITH to work correctly, routing to faith prefix must be + * setup toward a machine where a FAITH daemon operates. + * Also, the machine must enable some mechanizm + * (e.g. faith interface hack) to divert those packet with + * faith prefixed destination addr to user-land FAITH daemon. + */ + fp_str = getenv("GAI"); + if (fp_str && inet_pton(AF_INET6, fp_str, &faith_prefix) == 1 && + afd->a_af == AF_INET && pai->ai_socktype == SOCK_STREAM) { + u_int32_t v4a; + u_int8_t v4a_top; + + memcpy(&v4a, addr, sizeof v4a); + v4a_top = v4a >> IN_CLASSA_NSHIFT; + if (!IN_MULTICAST(v4a) && !IN_EXPERIMENTAL(v4a) && + v4a_top != 0 && v4a != IN_LOOPBACKNET) { + afd = &afdl[N_INET6]; + memcpy(&faith_prefix.s6_addr[12], addr, + sizeof(struct in_addr)); + translate = 1; + } + } +#endif + + 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 *)(ai + 1); + memset(ai->ai_addr, 0, afd->a_socklen); + ai->ai_addr->sa_len = afd->a_socklen; + ai->ai_addrlen = afd->a_socklen; + ai->ai_addr->sa_family = ai->ai_family = afd->a_af; + p = (char *)(ai->ai_addr); +#ifdef FAITH + if (translate == 1) + memcpy(p + afd->a_off, &faith_prefix, afd->a_addrlen); + else +#endif + memcpy(p + afd->a_off, addr, afd->a_addrlen); + + return ai; +} + +static int +get_portmatch(ai, servname) + const struct addrinfo *ai; + const char *servname; +{ + /* get_port does not touch first argument. when matchonly == 1. */ + return get_port((struct addrinfo *)ai, servname, 1); +} + +static int +get_port(ai, servname, matchonly) + struct addrinfo *ai; + const char *servname; + int matchonly; +{ + const char *proto; + struct servent *sp; + int port; + int allownumeric; + + if (servname == NULL) + return 0; + if (ai->ai_family != AF_INET +#ifdef INET6 + && ai->ai_family != AF_INET6 +#endif + ) + 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 *)ai->ai_addr)->sin_port = port; + break; +#ifdef INET6 + case AF_INET6: + ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port = port; + break; +#endif + } + } + + return 0; +} + +static const struct afd * +find_afd(af) + 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; +} |
