diff options
Diffstat (limited to 'contrib/bind/lib/irs/getaddrinfo.c')
| -rw-r--r-- | contrib/bind/lib/irs/getaddrinfo.c | 1516 |
1 files changed, 1118 insertions, 398 deletions
diff --git a/contrib/bind/lib/irs/getaddrinfo.c b/contrib/bind/lib/irs/getaddrinfo.c index f95a681..f2c533d 100644 --- a/contrib/bind/lib/irs/getaddrinfo.c +++ b/contrib/bind/lib/irs/getaddrinfo.c @@ -1,505 +1,1225 @@ -/*- - * Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved. - * The Berkeley Software Design Inc. software License Agreement specifies - * the terms and conditions for redistribution. +/* $KAME: getaddrinfo.c,v 1.14 2001/01/06 09:41:15 jinmei Exp $ */ + +/* + * 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. * - * BSDI $Id: getaddrinfo.c,v 8.3 1999/06/11 01:25:58 vixie Exp $ + * 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. */ -#include <port_before.h> +/* + * 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 (allows + * 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? + * - To avoid search order issue, we have a big amount of code duplicate + * from gethnamaddr.c and some other places. The issues that there's no + * lower layer function to lookup "IPv4 or IPv6" record. Calling + * gethostbyname2 from getaddrinfo will end up in wrong search order, as + * follows: + * - 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 "port_before.h" + +#include <sys/types.h> #include <sys/param.h> #include <sys/socket.h> -#include <sys/un.h> + +#include <net/if.h> #include <netinet/in.h> + +#include <arpa/inet.h> +#include <arpa/nameser.h> + #include <netdb.h> -#include <errno.h> +#include <resolv.h> #include <string.h> #include <stdlib.h> -#include <arpa/nameser.h> -#include <resolv.h> -#include <arpa/inet.h> -#include <port_after.h> - -#define SA(addr) ((struct sockaddr *)(addr)) -#define SIN(addr) ((struct sockaddr_in *)(addr)) -#define SIN6(addr) ((struct sockaddr_in6 *)(addr)) -#define SUN(addr) ((struct sockaddr_un *)(addr)) - -static struct addrinfo - *ai_reverse(struct addrinfo *oai), - *ai_clone(struct addrinfo *oai, int family), - *ai_alloc(int family, int addrlen); -#ifdef AF_LOCAL -static int get_local(const char *name, int socktype, struct addrinfo **res); +#include <stddef.h> +#include <ctype.h> +#include <unistd.h> +#include <stdio.h> +#include <errno.h> + +#include <stdarg.h> + +#include <irs.h> + +#include "port_after.h" + +#include "irs_data.h" + +/* + * if we enable it, we will see duplicated addrinfo entries on reply if both + * AAAA and A6 records are found. disable it for default installation. + */ +#undef T_A6 + +#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 [] = { + {PF_INET6, sizeof(struct in6_addr), + sizeof(struct sockaddr_in6), + offsetof(struct sockaddr_in6, sin6_addr), + in6_addrany, in6_loopback, 1}, + {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 + { PF_INET6, SOCK_DGRAM, IPPROTO_UDP, "udp", 0x07 }, + { PF_INET6, SOCK_STREAM, IPPROTO_TCP, "tcp", 0x07 }, + { PF_INET6, SOCK_RAW, ANY, NULL, 0x05 }, + { 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 }, +}; + +#define PTON_MAX 16 + +#define MAXPACKET (1024*64) -static int add_ipv4(const char *hostname, int flags, struct addrinfo **aip, - int socktype, int port); -static int add_ipv6(const char *hostname, int flags, struct addrinfo **aip, - int socktype, int port); -static void set_order(int, int (**)()); +typedef union { + HEADER hdr; + u_char buf[MAXPACKET]; +} querybuf; + +static int str_isnumber __P((const char *)); +static int explore_fqdn __P((const struct addrinfo *, const char *, + const char *, struct addrinfo **)); +static int explore_copy __P((const struct addrinfo *, const struct addrinfo *, + struct addrinfo **)); +static int explore_null __P((const struct addrinfo *, + 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_canonname __P((const struct addrinfo *, + struct addrinfo *, const char *)); +static struct addrinfo *get_ai __P((const struct addrinfo *, + const struct afd *, const char *)); +static struct addrinfo *copy_ai __P((const struct addrinfo *)); +static int get_portmatch __P((const struct addrinfo *, const char *)); +static int get_port __P((const struct addrinfo *, const char *, int)); +static const struct afd *find_afd __P((int)); +static int addrconfig __P((int)); +static int ip6_str2scopeid __P((char *, struct sockaddr_in6 *)); +static struct net_data *init __P((void)); + +struct addrinfo *hostent2addrinfo __P((struct hostent *, + const struct addrinfo *)); +struct addrinfo *addr2addrinfo __P((const struct addrinfo *, + const char *)); + +#if 0 +static const 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 */ +}; +#endif -#define FOUND_IPV4 0x1 -#define FOUND_IPV6 0x2 -#define FOUND_MAX 2 +/* 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))) + +#if 0 /* bind8 has its own version */ +char * +gai_strerror(ecode) + int ecode; +{ + if (ecode < 0 || ecode > EAI_MAX) + ecode = EAI_MAX; + return ai_errlist[ecode]; +} +#endif + +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); + ai = next; + } while (ai); +} + +static int +str_isnumber(p) + const char *p; +{ + char *ep; + + if (*p == '\0') + return NO; + ep = NULL; + (void)strtoul(p, &ep, 10); + if (ep && *ep == '\0') + return YES; + else + return NO; +} int -getaddrinfo(const char *hostname, const char *servname, - const struct addrinfo *hints, struct addrinfo **res) +getaddrinfo(hostname, servname, hints, res) + const char *hostname, *servname; + const struct addrinfo *hints; + struct addrinfo **res; { - struct servent *sp; - char *proto; - int family, socktype, flags, protocol; - struct addrinfo *ai, *ai_list; - int port, err, i; - int (*net_order[FOUND_MAX+1])(); + struct addrinfo sentinel; + struct addrinfo *cur; + int error = 0; + struct addrinfo ai, ai0, *afai; + struct addrinfo *pai; + const struct explore *ex; - if (hostname == NULL && servname == NULL) - return (EAI_NONAME); + 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; - proto = NULL; - if (hints != NULL) { - if (hints->ai_flags & ~(AI_MASK)) - return (EAI_BADFLAGS); + 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) { - errno = EINVAL; - return (EAI_SYSTEM); - } - family = hints->ai_family; - socktype = hints->ai_socktype; - protocol = hints->ai_protocol; - flags = hints->ai_flags; - switch (family) { - case AF_UNSPEC: - switch (hints->ai_socktype) { - case SOCK_STREAM: proto = "tcp"; break; - case SOCK_DGRAM: proto = "udp"; break; - } - break; - case AF_INET: - case AF_INET6: - switch (hints->ai_socktype) { - case 0: break; - case SOCK_STREAM: proto = "tcp"; break; - case SOCK_DGRAM: proto = "udp"; break; - case SOCK_RAW: break; - default: return (EAI_SOCKTYPE); - } - break; -#ifdef AF_LOCAL - case AF_LOCAL: - switch (hints->ai_socktype) { - case 0: break; - case SOCK_STREAM: break; - case SOCK_DGRAM: break; - default: return (EAI_SOCKTYPE); - } + 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: + case PF_INET6: break; -#endif default: - return (EAI_FAMILY); + 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); + } + } } - } else { - protocol = 0; - family = 0; - socktype = 0; - flags = 0; } -#ifdef AF_LOCAL /* - * First, deal with AF_LOCAL. If the family was not set, - * then assume AF_LOCAL if the first character of the - * hostname/servname is '/'. + * 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: + if (pai->ai_family != AF_INET6) + pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); + break; + case AI_ALL: +#if 1 + /* illegal */ + ERR(EAI_BADFLAGS); +#else + pai->ai_flags &= ~(AI_ALL | AI_V4MAPPED); + break; +#endif + } - if (hostname && - (family == AF_LOCAL || (family == 0 && *hostname == '/'))) - return (get_local(hostname, socktype, res)); + /* + * 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 (servname && - (family == AF_LOCAL || (family == 0 && *servname == '/'))) - return (get_local(servname, socktype, res)); + 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 the servname does not match socktype/protocol, ignore it. + */ + if (get_portmatch(pai, servname) != 0) + continue; + + if (hostname == NULL) { + /* + * filter out AFs that are not supported by the kernel + * XXX errno? + */ + if (!addrconfig(pai->ai_family)) + continue; + 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; + } /* - * Ok, only AF_INET and AF_INET6 left. + * XXX + * If numreic representation of AF1 can be interpreted as FQDN + * representation of AF2, we need to think again about the code below. */ - ai_list = NULL; + if (sentinel.ai_next) + goto good; + + if (pai->ai_flags & AI_NUMERICHOST) + ERR(EAI_NONAME); + if (hostname == NULL) + ERR(EAI_NONAME); /* - * First, look up the service name (port) if it was - * requested. If the socket type wasn't specified, then - * try and figure it out. + * hostname as alphabetical name. + * We'll make sure that + * - if returning addrinfo list is empty, return non-zero error + * value (already known one or EAI_NONAME). + * - otherwise, + * + if we haven't had any errors, return 0 (i.e. success). + * + if we've had an error, free the list and return the error. + * without any assumption on the behavior of explore_fqdn(). */ - if (servname) { - char *e; - - port = strtol(servname, &e, 10); - if (*e == '\0') { - if (socktype == 0) - return (EAI_SOCKTYPE); - if (port < 0 || port > 65535) - return (EAI_SERVICE); - port = htons(port); - } else { - sp = getservbyname(servname, proto); - if (sp == NULL) - return (EAI_SERVICE); - port = sp->s_port; - if (socktype == 0) { - if (strcmp(sp->s_proto, "tcp")) - socktype = SOCK_STREAM; - else if (strcmp(sp->s_proto, "udp")) - socktype = SOCK_DGRAM; - } - } - } else - port = 0; + + /* first, try to query DNS for all possible address families. */ + *pai = ai0; + error = explore_fqdn(pai, hostname, servname, &afai); + if (error) { + if (afai != NULL) + freeaddrinfo(afai); + goto free; + } + if (afai == NULL) { + error = EAI_NONAME; /* we've had no errors. */ + goto free; + } /* - * Next, deal with just a service name, and no hostname. - * (we verified that one of them was non-null up above). + * we would like to prefer AF_INET6 than AF_INET, so we'll make an + * outer loop by AFs. */ - if (hostname == NULL && (flags & AI_PASSIVE) != 0) { - if (family == AF_INET || family == 0) { - ai = ai_alloc(AF_INET, sizeof(struct sockaddr_in)); - if (ai == NULL) - return (EAI_MEMORY); - ai->ai_socktype = socktype; - ai->ai_protocol = protocol; - SIN(ai->ai_addr)->sin_port = port; - ai->ai_next = ai_list; - ai_list = ai; + for (ex = explore; ex->e_af >= 0; ex++) { + *pai = ai0; + + if (pai->ai_family == PF_UNSPEC) + pai->ai_family = ex->e_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 (family == AF_INET6 || family == 0) { - ai = ai_alloc(AF_INET6, sizeof(struct sockaddr_in6)); - if (ai == NULL) { - freeaddrinfo(ai_list); - return (EAI_MEMORY); - } - ai->ai_socktype = socktype; - ai->ai_protocol = protocol; - SIN6(ai->ai_addr)->sin6_port = port; - ai->ai_next = ai_list; - ai_list = ai; +#ifdef AI_ADDRCONFIG + /* + * If AI_ADDRCONFIG is specified, check if we are + * expected to return the address family or not. + */ + if ((pai->ai_flags & AI_ADDRCONFIG) != 0 && + !addrconfig(pai->ai_family)) + continue; +#endif + + 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 the servname does not match socktype/protocol, ignore it. + */ + if (get_portmatch(pai, servname) != 0) + continue; + + if ((error = explore_copy(pai, afai, &cur->ai_next)) != 0) { + freeaddrinfo(afai); + goto free; } - *res = ai_list; - return (0); + while (cur && cur->ai_next) + cur = cur->ai_next; } + freeaddrinfo(afai); /* afai must not be NULL at this point. */ + + /* we must not have got any errors. */ + if (error != 0) /* just for diagnosis */ + abort(); + + if (sentinel.ai_next) { +good: + *res = sentinel.ai_next; + return(SUCCESS); + } else { + /* + * All the process succeeded, but we've had an empty list. + * This can happen if the given hints do not match our + * candidates. + */ + error = EAI_NONAME; + } + +free: +bad: + 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; +{ + struct addrinfo *result; + struct addrinfo *cur; + struct net_data *net_data = init(); + struct irs_ho *ho; + int error = 0; + char tmp[NS_MAXDNAME]; + const char *cp; + + result = NULL; + /* - * If the family isn't specified or AI_NUMERICHOST specified, - * check first to see if it * is a numeric address. - * Though the gethostbyname2() routine - * will recognize numeric addresses, it will only recognize - * the format that it is being called for. Thus, a numeric - * AF_INET address will be treated by the AF_INET6 call as - * a domain name, and vice versa. Checking for both numerics - * here avoids that. + * if the servname does not match socktype/protocol, ignore it. */ - if (hostname != NULL && - (family == 0 || (flags & AI_NUMERICHOST) != 0)) { - char abuf[sizeof(struct in6_addr)]; - char nbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx00")]; - int addrsize, addroff; - - if (inet_aton(hostname, (struct in_addr *)abuf)) { - if (family == AF_INET6) { - /* Convert to a V4 mapped address */ - struct in6_addr *a6 = (struct in6_addr *)abuf; - memcpy(&a6->s6_addr[12], &a6->s6_addr[0], 4); - memset(&a6->s6_addr[10], 0xff, 2); - memset(&a6->s6_addr[0], 0, 10); - goto inet6_addr; - } - addrsize = sizeof(struct in_addr); - addroff = (char *)(&SIN(0)->sin_addr) - (char *)0; - family = AF_INET; - goto common; - - } else if (inet_pton(AF_INET6, hostname, abuf)) { - if (family && family != AF_INET6) - return (EAI_NONAME); - inet6_addr: - addrsize = sizeof(struct in6_addr); - addroff = (char *)(&SIN6(0)->sin6_addr) - (char *)0; - family = AF_INET6; - - common: - if ((ai = ai_clone(ai_list, family)) == NULL) - return (EAI_MEMORY); - ai_list = ai; - ai->ai_socktype = socktype; - SIN(ai->ai_addr)->sin_port = port; - memcpy((char *)ai->ai_addr + addroff, abuf, addrsize); - if (flags & AI_CANONNAME) { - inet_ntop(family, abuf, nbuf, sizeof(nbuf)); - ai->ai_canonname = strdup(nbuf); - } - goto done; - } else if ((flags & AI_NUMERICHOST) != 0){ - return (EAI_NONAME); - } + if (get_portmatch(pai, servname) != 0) + return(0); + + if (!net_data || !(ho = net_data->ho)) + return(0); +#if 0 /* XXX (notyet) */ + if (net_data->ho_stayopen && net_data->ho_last && + net_data->ho_last->h_addrtype == af) { + if (ns_samename(name, net_data->ho_last->h_name) == 1) + return (net_data->ho_last); + for (hap = net_data->ho_last->h_aliases; hap && *hap; hap++) + if (ns_samename(name, *hap) == 1) + return (net_data->ho_last); } +#endif + if (!strchr(hostname, '.') && + (cp = res_hostalias(net_data->res, hostname, + tmp, sizeof(tmp)))) + hostname = cp; + result = (*ho->addrinfo)(ho, hostname, pai); + if (!net_data->ho_stayopen) { + (*ho->minimize)(ho); + } + if (result == NULL) { + int e = h_errno; - set_order(family, net_order); - for (i = 0; i < FOUND_MAX; i++) { - if (net_order[i] == NULL) + switch(e) { + case NETDB_INTERNAL: + error = EAI_SYSTEM; + break; + case TRY_AGAIN: + error = EAI_AGAIN; + break; + case NO_RECOVERY: + error = EAI_FAIL; + break; + case HOST_NOT_FOUND: + case NO_DATA: + error = EAI_NONAME; break; - if ((err = (net_order[i])(hostname, flags, &ai_list, - socktype, port)) != 0) - return(err); + default: + case NETDB_SUCCESS: /* should be impossible... */ + error = EAI_NONAME; + break; + } + goto free; } - if (ai_list == NULL) - return (EAI_NODATA); + for (cur = result; cur; cur = cur->ai_next) { + GET_PORT(cur, servname); /* XXX: redundant lookups... */ + /* canonname should already be filled. */ + } -done: - ai_list = ai_reverse(ai_list); + *res = result; - *res = ai_list; - return (0); + return(0); + +free: + if (result) + freeaddrinfo(result); + return error; } -static void -set_order(family, net_order) - int family; - int (**net_order)(); +static int +explore_copy(pai, src0, res) + const struct addrinfo *pai; /* seed */ + const struct addrinfo *src0; /* source */ + struct addrinfo **res; { - char *order, *tok; - int found; + int error; + struct addrinfo sentinel, *cur; + const struct addrinfo *src; - if (family) { - switch (family) { - case AF_INET: - *net_order++ = add_ipv4; - break; - case AF_INET6: - *net_order++ = add_ipv6; - break; - } - } else { - order = getenv("NET_ORDER"); - found = 0; - while (order != NULL) { - /* We ignore any unknown names. */ - tok = strsep(&order, ":"); - if (strcasecmp(tok, "inet6") == 0) { - if ((found & FOUND_IPV6) == 0) - *net_order++ = add_ipv6; - found |= FOUND_IPV6; - } else if (strcasecmp(tok, "inet") == 0 || - strcasecmp(tok, "inet4") == 0) { - if ((found & FOUND_IPV4) == 0) - *net_order++ = add_ipv4; - found |= FOUND_IPV4; - } + error = 0; + sentinel.ai_next = NULL; + cur = &sentinel; + + for (src = src0; src != NULL; src = src->ai_next) { + if (src->ai_family != pai->ai_family) + continue; + + cur->ai_next = copy_ai(src); + if (!cur->ai_next) { + error = EAI_MEMORY; + goto fail; } - /* Add in anything that we didn't find */ - if ((found & FOUND_IPV4) == 0) - *net_order++ = add_ipv4; - if ((found & FOUND_IPV6) == 0) - *net_order++ = add_ipv6; + cur->ai_next->ai_socktype = pai->ai_socktype; + cur->ai_next->ai_protocol = pai->ai_protocol; + cur = cur->ai_next; } - *net_order = NULL; - return; + + *res = sentinel.ai_next; + return 0; + +fail: + freeaddrinfo(sentinel.ai_next); + return error; } -static char v4_loop[4] = { 127, 0, 0, 1 }; +/* + * 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, servname, res) + 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; + + 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 -add_ipv4(const char *hostname, int flags, struct addrinfo **aip, - int socktype, int port) +explore_numeric(pai, hostname, servname, res) + const struct addrinfo *pai; + const char *hostname; + const char *servname; + struct addrinfo **res; { - struct addrinfo *ai; - struct hostent *hp; - char **addr; + 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 (hostname == NULL && (flags & AI_PASSIVE) == 0) { - if ((ai = ai_clone(*aip, AF_INET)) == NULL) { - freeaddrinfo(*aip); - return(EAI_MEMORY); + 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; + } - *aip = ai; - ai->ai_socktype = socktype; - SIN(ai->ai_addr)->sin_port = port; - memcpy(&SIN(ai->ai_addr)->sin_addr, v4_loop, 4); - } else if ((hp = gethostbyname2(hostname, AF_INET)) != NULL) { - for (addr = hp->h_addr_list; *addr; addr++) { - if ((ai = ai_clone(*aip, hp->h_addrtype)) == NULL) { - freeaddrinfo(*aip); - return(EAI_MEMORY); - } - *aip = ai; - ai->ai_socktype = socktype; - - /* We get IPv6 addresses if RES_USE_INET6 is set */ - if (hp->h_addrtype == AF_INET6) { - SIN6(ai->ai_addr)->sin6_port = port; - memcpy(&SIN6(ai->ai_addr)->sin6_addr, *addr, - hp->h_length); - } else { - SIN(ai->ai_addr)->sin_port = port; - memcpy(&SIN(ai->ai_addr)->sin_addr, *addr, - hp->h_length); + *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, *scope, *addr; + struct sockaddr_in6 *sin6; + + 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'; + addr = hostname2; + scope = cp + 1; + + 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_NONAME); /* XXX: is return OK? */ } - if (flags & AI_CANONNAME) - ai->ai_canonname = strdup(hp->h_name); +#ifdef HAVE_SIN6_SCOPE_ID + sin6->sin6_scope_id = scopeid; +#endif } } - return(0); -} -static char v6_loop[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }; + free(hostname2); + + return error; +#endif +} static int -add_ipv6(const char *hostname, int flags, struct addrinfo **aip, - int socktype, int port) +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; - struct hostent *hp; - char **addr; - if (hostname == NULL && (flags & AI_PASSIVE) == 0) { - if ((ai = ai_clone(*aip, AF_INET6)) == NULL) { - freeaddrinfo(*aip); - return(EAI_MEMORY); - } + ai = (struct addrinfo *)malloc(sizeof(struct addrinfo) + + (afd->a_socklen)); + if (ai == NULL) + return NULL; - *aip = ai; - ai->ai_socktype = socktype; - SIN6(ai->ai_addr)->sin6_port = port; - memcpy(&SIN6(ai->ai_addr)->sin6_addr, v6_loop, 16); - } else if ((hp = gethostbyname2(hostname, AF_INET6)) != NULL) { - for (addr = hp->h_addr_list; *addr; addr++) { - if ((ai = ai_clone(*aip, AF_INET6)) == NULL) { - freeaddrinfo(*aip); - return (EAI_MEMORY); - } - *aip = ai; - ai->ai_socktype = socktype; - SIN6(ai->ai_addr)->sin6_port = port; - memcpy(&SIN6(ai->ai_addr)->sin6_addr, *addr, - hp->h_length); - if (flags & AI_CANONNAME) - ai->ai_canonname = strdup(hp->h_name); + memcpy(ai, pai, sizeof(struct addrinfo)); + ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); + memset(ai->ai_addr, 0, (size_t)afd->a_socklen); +#ifdef HAVE_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; +} + +/* XXX need to malloc() the same way we do from other functions! */ +static struct addrinfo * +copy_ai(pai) + const struct addrinfo *pai; +{ + struct addrinfo *ai; + size_t l; + + l = sizeof(*ai) + pai->ai_addrlen; + if ((ai = (struct addrinfo *)malloc(l)) == NULL) + return NULL; + memset(ai, 0, l); + memcpy(ai, pai, sizeof(*ai)); + ai->ai_addr = (struct sockaddr *)(void *)(ai + 1); + memcpy(ai->ai_addr, pai->ai_addr, pai->ai_addrlen); + + if (pai->ai_canonname) { + l = strlen(pai->ai_canonname) + 1; + if ((ai->ai_canonname = malloc(l)) == NULL) { + free(ai); + return NULL; } +#ifdef HAVE_STRLCPY + strlcpy(ai->ai_canonname, pai->ai_canonname, l); +#else + strncpy(ai->ai_canonname, pai->ai_canonname, l); +#endif + } else { + /* just to make sure */ + ai->ai_canonname = NULL; } - return (0); + + ai->ai_next = NULL; + + return ai; } -void -freeaddrinfo(struct addrinfo *ai) { - struct addrinfo *ai_next; +static int +get_portmatch(const struct addrinfo *ai, const char *servname) { - while (ai != NULL) { - ai_next = ai->ai_next; - if (ai->ai_addr) - free(ai->ai_addr); - if (ai->ai_canonname) - free(ai->ai_canonname); - free(ai); - ai = ai_next; - } + /* get_port does not touch first argument. when matchonly == 1. */ + /* LINTED const cast */ + return get_port((const struct addrinfo *)ai, servname, 1); } -#ifdef AF_LOCAL static int -get_local(const char *name, int socktype, struct addrinfo **res) { - struct addrinfo *ai; - struct sockaddr_un *sun; +get_port(const struct addrinfo *ai, const char *servname, int matchonly) { + const char *proto; + struct servent *sp; + int port; + int allownumeric; - if (socktype == 0) - return (EAI_SOCKTYPE); + if (servname == NULL) + return 0; + switch (ai->ai_family) { + case AF_INET: +#ifdef AF_INET6 + case AF_INET6: +#endif + break; + default: + return 0; + } - if ((ai = ai_alloc(AF_LOCAL, sizeof(*sun))) == NULL) - return (EAI_MEMORY); + 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; + } - sun = SUN(ai->ai_addr); - strncpy(sun->sun_path, name, sizeof(sun->sun_path)); + 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; + } - ai->ai_socktype = socktype; - /* - * ai->ai_flags, ai->ai_protocol, ai->ai_canonname, - * and ai->ai_next were initialized to zero. - */ + 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; + case AF_INET6: + ((struct sockaddr_in6 *)(void *) + ai->ai_addr)->sin6_port = port; + break; + } + } - *res = ai; - return (0); + 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; } -#endif /* - * Allocate an addrinfo structure, and a sockaddr structure - * of the specificed length. We initialize: - * ai_addrlen - * ai_family - * ai_addr - * ai_addr->sa_family - * ai_addr->sa_len (HAVE_SA_LEN) - * and everything else is initialized to zero. + * 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 struct addrinfo * -ai_alloc(int family, int addrlen) { - struct addrinfo *ai; +static int +addrconfig(af) + int af; +{ + int s; - if ((ai = (struct addrinfo *)calloc(1, sizeof(*ai))) == NULL) - return (NULL); + /* XXX errno */ + s = socket(af, SOCK_DGRAM, 0); + if (s < 0) { + if (errno != EMFILE) + return 0; + } else + close(s); + return 1; +} - if ((ai->ai_addr = SA(calloc(1, addrlen))) == NULL) { - free(ai); - return (NULL); +/* convert a string to a scope identifier. XXX: IPv6 specific */ +static int +ip6_str2scopeid(scope, sin6) + 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; + +#ifdef USE_IFNAMELINKID + if (IN6_IS_ADDR_LINKLOCAL(a6) || IN6_IS_ADDR_MC_LINKLOCAL(a6)) { + /* + * Using interface names as link indices can be allowed + * only when we can assume a one-to-one mappings between + * links and interfaces. See comments in getnameinfo.c. + */ + scopeid = if_nametoindex(scope); + if (scopeid == 0) + goto trynumeric; + return(scopeid); } - ai->ai_addrlen = addrlen; - ai->ai_family = family; - ai->ai_addr->sa_family = family; -#ifdef HAVE_SA_LEN - ai->ai_addr->sa_len = addrlen; #endif - return (ai); + + /* 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; } -static struct addrinfo * -ai_clone(struct addrinfo *oai, int family) { - struct addrinfo *ai; +struct addrinfo * +hostent2addrinfo(hp, pai) + struct hostent *hp; + const struct addrinfo *pai; +{ + int i, af, error = 0; + char **aplist = NULL, *ap; + struct addrinfo sentinel, *cur; + const struct afd *afd; + + af = hp->h_addrtype; + if (pai->ai_family != AF_UNSPEC && af != pai->ai_family) + return(NULL); + + afd = find_afd(af); + if (afd == NULL) + return(NULL); + + aplist = hp->h_addr_list; - ai = ai_alloc(family, ((family == AF_INET6) ? - sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in))); + memset(&sentinel, 0, sizeof(sentinel)); + cur = &sentinel; - if (ai == NULL) { - freeaddrinfo(oai); - return (NULL); + for (i = 0; (ap = aplist[i]) != NULL; i++) { +#if 0 /* the trick seems too much */ + af = hp->h_addr_list; + 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); + } + afd = find_afd(af); + if (afd == NULL) + continue; +#endif /* 0 */ + + 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) /* no need to loop, actually. */ + cur = cur->ai_next; + continue; + + free: + if (cur->ai_next) + freeaddrinfo(cur->ai_next); + cur->ai_next = NULL; + /* continue, without tht pointer CUR advanced. */ } - if (oai == NULL) - return (ai); - - ai->ai_flags = oai->ai_flags; - ai->ai_socktype = oai->ai_socktype; - ai->ai_protocol = oai->ai_protocol; - ai->ai_canonname = NULL; - ai->ai_next = oai; - return (ai); + + return(sentinel.ai_next); } -static struct addrinfo * -ai_reverse(struct addrinfo *oai) { - struct addrinfo *nai, *tai; - - nai = NULL; - - while (oai) { - /* grab one off the old list */ - tai = oai; - oai = oai->ai_next; - /* put it on the front of the new list */ - tai->ai_next = nai; - nai = tai; +struct addrinfo * +addr2addrinfo(pai, cp) + const struct addrinfo *pai; + const char *cp; +{ + const struct afd *afd; + + afd = find_afd(pai->ai_family); + if (afd == NULL) + return(NULL); + + return(get_ai(pai, afd, cp)); +} + +static struct net_data * +init() +{ + struct net_data *net_data; + + if (!(net_data = net_data_init(NULL))) + goto error; + if (!net_data->ho) { + net_data->ho = (*net_data->irs->ho_map)(net_data->irs); + if (!net_data->ho || !net_data->res) { +error: + errno = EIO; + if (net_data && net_data->res) + RES_SET_H_ERRNO(net_data->res, NETDB_INTERNAL); + return (NULL); + } + + (*net_data->ho->res_set)(net_data->ho, net_data->res, NULL); } - return (nai); + + return (net_data); } |
