lib/lwres/getaddrinfo.c

	getaddrinfo.c revision af5073d03288a53b646ec3b807ac25ced64d7879
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews/*
11e9368a226272085c337e9e74b79808c16fbdbaTinderbox User * Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * Copyright (C) 1999-2001  Internet Software Consortium.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews *
4a14ce5ba00ab7bc55c99ffdcf59c7a4ab902721Automatic Updater * This code is derived from software contributed to ISC by
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * Berkeley Software Design, Inc.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews *
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * Permission to use, copy, modify, and distribute this software for any
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * purpose with or without fee is hereby granted, provided that the above
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * copyright notice and this permission notice appear in all copies.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews *
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND BERKELEY SOFTWARE DESIGN, INC.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews */
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User/* $Id: getaddrinfo.c,v 1.43 2004/03/05 05:48:26 marka Exp $ */
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
cd32f419a8a5432fbb139f56ee73cbf68b9350ccTinderbox User#include <config.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#include <string.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#include <errno.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#include <stdlib.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#include <lwres/lwres.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#include <lwres/net.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#include <lwres/netdb.h>
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#define SA(addr)    ((struct sockaddr *)(addr))
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#define SIN(addr)   ((struct sockaddr_in *)(addr))
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#define SIN6(addr)  ((struct sockaddr_in6 *)(addr))
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#define SUN(addr)   ((struct sockaddr_un *)(addr))
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrewsstatic struct addrinfo
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    *ai_reverse(struct addrinfo *oai),
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    *ai_clone(struct addrinfo *oai, int family),
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User    *ai_alloc(int family, int addrlen);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#ifdef AF_LOCAL
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox Userstatic int get_local(const char *name, int socktype, struct addrinfo **res);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#endif
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrewsstatic int add_ipv4(const char *hostname, int flags, struct addrinfo **aip,
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User    int socktype, int port);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrewsstatic int add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User    int socktype, int port);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox Userstatic void set_order(int, int (**)(const char *, int, struct addrinfo **,
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User         int, int));
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User#define FOUND_IPV4  0x1
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User#define FOUND_IPV6  0x2
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#define FOUND_MAX   2
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#define ISC_AI_MASK (AI_PASSIVE|AI_CANONNAME|AI_NUMERICHOST)
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrewsint
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox Userlwres_getaddrinfo(const char *hostname, const char *servname,
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    const struct addrinfo *hints, struct addrinfo **res)
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt{
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    struct servent *sp;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    const char *proto;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    int family, socktype, flags, protocol;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    struct addrinfo *ai, *ai_list;
f6da30bb5447c23d880b09f601441e70c5313557Mark Andrews    int port, err, i;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    int (*net_order[FOUND_MAX+1])(const char *, int, struct addrinfo **,
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt         int, int);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User    if (hostname == NULL && servname == NULL)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        return (EAI_NONAME);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User    proto = NULL;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    if (hints != NULL) {
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        if ((hints->ai_flags & ~(ISC_AI_MASK)) != 0)
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            return (EAI_BADFLAGS);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        if (hints->ai_addrlen || hints->ai_canonname ||
f7b41fd9291b8f4dba27e2b57e1d93f0913a4f1dMark Andrews            hints->ai_addr || hints->ai_next) {
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            errno = EINVAL;
f7b41fd9291b8f4dba27e2b57e1d93f0913a4f1dMark Andrews            return (EAI_SYSTEM);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        }
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        family = hints->ai_family;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        socktype = hints->ai_socktype;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        protocol = hints->ai_protocol;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        flags = hints->ai_flags;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        switch (family) {
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        case AF_UNSPEC:
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            switch (hints->ai_socktype) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            case SOCK_STREAM:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                proto = "tcp";
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                break;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            case SOCK_DGRAM:
d8620c7234281056fdfd2ee40cf16636b8281092Tinderbox User                proto = "udp";
d8620c7234281056fdfd2ee40cf16636b8281092Tinderbox User                break;
d8620c7234281056fdfd2ee40cf16636b8281092Tinderbox User            }
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            break;
d8620c7234281056fdfd2ee40cf16636b8281092Tinderbox User        case AF_INET:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        case AF_INET6:
d8620c7234281056fdfd2ee40cf16636b8281092Tinderbox User            switch (hints->ai_socktype) {
d8620c7234281056fdfd2ee40cf16636b8281092Tinderbox User            case 0:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                break;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            case SOCK_STREAM:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                proto = "tcp";
9fbbfb5757a1e3e86d7dea62c4e63ffc2303ca2bAutomatic Updater                break;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            case SOCK_DGRAM:
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                proto = "udp";
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                break;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            case SOCK_RAW:
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews                break;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            default:
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                return (EAI_SOCKTYPE);
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            }
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            break;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#ifdef  AF_LOCAL
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        case AF_LOCAL:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            switch (hints->ai_socktype) {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            case 0:
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                break;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            case SOCK_STREAM:
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                break;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            case SOCK_DGRAM:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                break;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            default:
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                return (EAI_SOCKTYPE);
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            }
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            break;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#endif
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        default:
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            return (EAI_FAMILY);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        }
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews    } else {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        protocol = 0;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        family = 0;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        socktype = 0;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        flags = 0;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    }
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#ifdef  AF_LOCAL
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    /*
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt     * First, deal with AF_LOCAL.  If the family was not set,
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt     * then assume AF_LOCAL if the first character of the
a057e8e33baa5fa369be28a9680585200ce3ff73Mark Andrews     * hostname/servname is '/'.
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     */
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    if (hostname != NULL &&
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        (family == AF_LOCAL || (family == 0 && *hostname == '/')))
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        return (get_local(hostname, socktype, res));
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    if (servname != NULL &&
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        (family == AF_LOCAL || (family == 0 && *servname == '/')))
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        return (get_local(servname, socktype, res));
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User#endif
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
72938578c985138165e7a4b0a38f16daacbad95eAutomatic Updater    /*
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     * Ok, only AF_INET and AF_INET6 left.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews     */
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    ai_list = NULL;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    /*
72938578c985138165e7a4b0a38f16daacbad95eAutomatic Updater     * First, look up the service name (port) if it was
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     * requested.  If the socket type wasn't specified, then
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt     * try and figure it out.
dba3c818ae00b10388d31703e86a28415db398acTinderbox User     */
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    if (servname != NULL) {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        char *e;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        port = strtol(servname, &e, 10);
dba3c818ae00b10388d31703e86a28415db398acTinderbox User        if (*e == '\0') {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            if (socktype == 0)
dba3c818ae00b10388d31703e86a28415db398acTinderbox User                return (EAI_SOCKTYPE);
72938578c985138165e7a4b0a38f16daacbad95eAutomatic Updater            if (port < 0 || port > 65535)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                return (EAI_SERVICE);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            port = htons((unsigned short) port);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        } else {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            sp = getservbyname(servname, proto);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (sp == NULL)
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                return (EAI_SERVICE);
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            port = sp->s_port;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            if (socktype == 0) {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                if (strcmp(sp->s_proto, "tcp") == 0)
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                    socktype = SOCK_STREAM;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                else if (strcmp(sp->s_proto, "udp") == 0)
0e1dece22e128f9dfa723316a35c4b3f06912381Tinderbox User                    socktype = SOCK_DGRAM;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            }
0e1dece22e128f9dfa723316a35c4b3f06912381Tinderbox User        }
0e1dece22e128f9dfa723316a35c4b3f06912381Tinderbox User    } else
0e1dece22e128f9dfa723316a35c4b3f06912381Tinderbox User        port = 0;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
0e1dece22e128f9dfa723316a35c4b3f06912381Tinderbox User    /*
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     * Next, deal with just a service name, and no hostname.
97e74139b19368e385a3564746d42db70879195eAutomatic Updater     * (we verified that one of them was non-null up above).
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     */
43b94483957d3168796a816ed86cf097518817dcTinderbox User    if (hostname == NULL && (flags & AI_PASSIVE) != 0) {
dba3c818ae00b10388d31703e86a28415db398acTinderbox User        if (family == AF_INET || family == 0) {
dba3c818ae00b10388d31703e86a28415db398acTinderbox User            ai = ai_alloc(AF_INET, sizeof(struct sockaddr_in));
dba3c818ae00b10388d31703e86a28415db398acTinderbox User            if (ai == NULL)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                return (EAI_MEMORY);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            ai->ai_socktype = socktype;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            ai->ai_protocol = protocol;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            SIN(ai->ai_addr)->sin_port = port;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            ai->ai_next = ai_list;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            ai_list = ai;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        }
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
3b4098640dd85040270f39b9a5ee5e22de99d3d6Mark Andrews        if (family == AF_INET6 || family == 0) {
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            ai = ai_alloc(AF_INET6, sizeof(struct sockaddr_in6));
3b4098640dd85040270f39b9a5ee5e22de99d3d6Mark Andrews            if (ai == NULL) {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                lwres_freeaddrinfo(ai_list);
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                return (EAI_MEMORY);
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            }
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            ai->ai_socktype = socktype;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            ai->ai_protocol = protocol;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            SIN6(ai->ai_addr)->sin6_port = port;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            ai->ai_next = ai_list;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            ai_list = ai;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        }
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        *res = ai_list;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        return (0);
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    }
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    /*
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     * If the family isn't specified or AI_NUMERICHOST specified,
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews     * check first to see if it is a numeric address.
f7b41fd9291b8f4dba27e2b57e1d93f0913a4f1dMark Andrews     * Though the gethostbyname2() routine
f7b41fd9291b8f4dba27e2b57e1d93f0913a4f1dMark Andrews     * will recognize numeric addresses, it will only recognize
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt     * the format that it is being called for.  Thus, a numeric
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     * AF_INET address will be treated by the AF_INET6 call as
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater     * a domain name, and vice versa.  Checking for both numerics
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User     * here avoids that.
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater     */
e2e4d321999340802f77adaacd19c797d04b4b95Automatic Updater    if (hostname != NULL &&
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        (family == 0 || (flags & AI_NUMERICHOST) != 0)) {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        char abuf[sizeof(struct in6_addr)];
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        char nbuf[NI_MAXHOST];
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        int addrsize, addroff;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#ifdef LWRES_HAVE_SIN6_SCOPE_ID
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        char *p, *ep;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        char ntmp[NI_MAXHOST];
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        lwres_uint32_t scopeid;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#endif
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#ifdef LWRES_HAVE_SIN6_SCOPE_ID
285254345ce5ab270848f8c11f7be146793f1e00Mark Andrews        /*
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews         * Scope identifier portion.
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt         */
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        ntmp[0] = '\0';
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        if (strchr(hostname, '%') != NULL) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            strncpy(ntmp, hostname, sizeof(ntmp) - 1);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            ntmp[sizeof(ntmp) - 1] = '\0';
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            p = strchr(ntmp, '%');
3b4098640dd85040270f39b9a5ee5e22de99d3d6Mark Andrews            ep = NULL;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
3b4098640dd85040270f39b9a5ee5e22de99d3d6Mark Andrews            /*
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt             * Vendors may want to support non-numeric
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt             * scopeid around here.
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt             */
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (p != NULL)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                scopeid = (lwres_uint32_t)strtoul(p + 1,
d71e2e0c61df16ff37c9934c371a4a60c08974f7Mark Andrews                                  &ep, 10);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (p != NULL && ep != NULL && ep[0] == '\0')
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                *p = '\0';
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            else {
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                ntmp[0] = '\0';
7be2f6d5df28b207e3e385c555eb4f740150528dTinderbox User                scopeid = 0;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            }
c25602ed66bb0b53e72963dc38bd0d5f49b14496Tinderbox User        } else
c25602ed66bb0b53e72963dc38bd0d5f49b14496Tinderbox User            scopeid = 0;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt#endif
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User               if (lwres_net_pton(AF_INET, hostname, (struct in_addr *)abuf)
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews           == 1)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User           {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (family == AF_INET6) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                /*
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                 * Convert to a V4 mapped address.
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                 */
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                struct in6_addr *a6 = (struct in6_addr *)abuf;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                memcpy(&a6->s6_addr[12], &a6->s6_addr[0], 4);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                memset(&a6->s6_addr[10], 0xff, 2);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                memset(&a6->s6_addr[0], 0, 10);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                goto inet6_addr;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            }
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            addrsize = sizeof(struct in_addr);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            addroff = (char *)(&SIN(0)->sin_addr) - (char *)0;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            family = AF_INET;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            goto common;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#ifdef LWRES_HAVE_SIN6_SCOPE_ID
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        } else if (ntmp[0] != '\0' &&
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt               lwres_net_pton(AF_INET6, ntmp, abuf) == 1)
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        {
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt            if (family && family != AF_INET6)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                return (EAI_NONAME);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            addrsize = sizeof(struct in6_addr);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            addroff = (char *)(&SIN6(0)->sin6_addr) - (char *)0;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            family = AF_INET6;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            goto common;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#endif
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User        } else if (lwres_net_pton(AF_INET6, hostname, abuf) == 1) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (family != 0 && family != AF_INET6)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                return (EAI_NONAME);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        inet6_addr:
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            addrsize = sizeof(struct in6_addr);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            addroff = (char *)(&SIN6(0)->sin6_addr) - (char *)0;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            family = AF_INET6;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        common:
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            ai = ai_clone(ai_list, family);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (ai == NULL)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                return (EAI_MEMORY);
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            ai_list = ai;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            ai->ai_socktype = socktype;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            SIN(ai->ai_addr)->sin_port = port;
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User            memcpy((char *)ai->ai_addr + addroff, abuf, addrsize);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            if (flags & AI_CANONNAME) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#if defined(LWRES_HAVE_SIN6_SCOPE_ID)
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                if (ai->ai_family == AF_INET6)
fd2597f75693a2279fdf588bd40dfe2407c42028Tinderbox User                    SIN6(ai->ai_addr)->sin6_scope_id =
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                                    scopeid;
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews#endif
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                if (lwres_getnameinfo(ai->ai_addr,
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                    ai->ai_addrlen, nbuf, sizeof(nbuf),
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                              NULL, 0,
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                              NI_NUMERICHOST) == 0) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                    ai->ai_canonname = strdup(nbuf);
cd32f419a8a5432fbb139f56ee73cbf68b9350ccTinderbox User                    if (ai->ai_canonname == NULL)
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt                        return (EAI_MEMORY);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                } else {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                    /* XXX raise error? */
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews                    ai->ai_canonname = NULL;
4abdfc917e6635a7c81d1f931a0c79227e72d025Mark Andrews                }
4abdfc917e6635a7c81d1f931a0c79227e72d025Mark Andrews            }
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews            goto done;
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt        } else if ((flags & AI_NUMERICHOST) != 0) {
4abdfc917e6635a7c81d1f931a0c79227e72d025Mark Andrews            return (EAI_NONAME);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        }
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    }
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews
14a656f94b1fd0ababd84a772228dfa52276ba15Evan Hunt    set_order(family, net_order);
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews    for (i = 0; i < FOUND_MAX; i++) {
5a4557e8de2951a2796676b5ec4b6a90caa5be14Mark Andrews        if (net_order[i] == NULL)
            break;
        err = (net_order[i])(hostname, flags, &ai_list,
                     socktype, port);
        if (err != 0)
            return (err);
    }

    if (ai_list == NULL)
        return (EAI_NODATA);

done:
    ai_list = ai_reverse(ai_list);

    *res = ai_list;
    return (0);
}

static char *
lwres_strsep(char **stringp, const char *delim) {
    char *string = *stringp;
    char *s;
    const char *d;
    char sc, dc;

    if (string == NULL)
        return (NULL);

    for (s = string; *s != '\0'; s++) {
        sc = *s;
        for (d = delim; (dc = *d) != '\0'; d++)
            if (sc == dc) {
                *s++ = '\0';
                *stringp = s;
                return (string);
            }
    }
    *stringp = NULL;
    return (string);
}

static void
set_order(int family, int (**net_order)(const char *, int, struct addrinfo **,
                    int, int))
{
    char *order, *tok;
    int found;

    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 = lwres_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;
            }
        }

        /*
         * 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;
    }
    *net_order = NULL;
    return;
}

static char v4_loop[4] = { 127, 0, 0, 1 };

/*
 * The test against 0 is there to keep the Solaris compiler
 * from complaining about "end-of-loop code not reached".
 */
#define ERR(code) \
    do { result = (code);           \
        if (result != 0) goto cleanup;  \
    } while (0)

static int
add_ipv4(const char *hostname, int flags, struct addrinfo **aip,
    int socktype, int port)
{
    struct addrinfo *ai;
    lwres_context_t *lwrctx = NULL;
    lwres_gabnresponse_t *by = NULL;
    lwres_addr_t *addr;
    lwres_result_t lwres;
    int result = 0;

    lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
    if (lwres != LWRES_R_SUCCESS)
        ERR(EAI_FAIL);
    (void) lwres_conf_parse(lwrctx, lwres_resolv_conf);
    if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
        ai = ai_clone(*aip, AF_INET);
        if (ai == NULL) {
            lwres_freeaddrinfo(*aip);
            ERR(EAI_MEMORY);
        }

        *aip = ai;
        ai->ai_socktype = socktype;
        SIN(ai->ai_addr)->sin_port = port;
        memcpy(&SIN(ai->ai_addr)->sin_addr, v4_loop, 4);
    } else {
        lwres = lwres_getaddrsbyname(lwrctx, hostname,
                         LWRES_ADDRTYPE_V4, &by);
        if (lwres != LWRES_R_SUCCESS) {
            if (lwres == LWRES_R_NOTFOUND)
                goto cleanup;
            else
                ERR(EAI_FAIL);
        }
        addr = LWRES_LIST_HEAD(by->addrs);
        while (addr != NULL) {
            ai = ai_clone(*aip, AF_INET);
            if (ai == NULL) {
                lwres_freeaddrinfo(*aip);
                ERR(EAI_MEMORY);
            }
            *aip = ai;
            ai->ai_socktype = socktype;
            SIN(ai->ai_addr)->sin_port = port;
            memcpy(&SIN(ai->ai_addr)->sin_addr,
                   addr->address, 4);
            if (flags & AI_CANONNAME) {
                ai->ai_canonname = strdup(by->realname);
                if (ai->ai_canonname == NULL)
                    ERR(EAI_MEMORY);
            }
            addr = LWRES_LIST_NEXT(addr, link);
        }
    }
 cleanup:
    if (by != NULL)
        lwres_gabnresponse_free(lwrctx, &by);
    if (lwrctx != NULL) {
        lwres_conf_clear(lwrctx);
        lwres_context_destroy(&lwrctx);
    }
    return (result);
}

static char v6_loop[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 };

static int
add_ipv6(const char *hostname, int flags, struct addrinfo **aip,
     int socktype, int port)
{
    struct addrinfo *ai;
    lwres_context_t *lwrctx = NULL;
    lwres_gabnresponse_t *by = NULL;
    lwres_addr_t *addr;
    lwres_result_t lwres;
    int result = 0;

    lwres = lwres_context_create(&lwrctx, NULL, NULL, NULL, 0);
    if (lwres != LWRES_R_SUCCESS)
        ERR(EAI_FAIL);
    (void) lwres_conf_parse(lwrctx, lwres_resolv_conf);

    if (hostname == NULL && (flags & AI_PASSIVE) == 0) {
        ai = ai_clone(*aip, AF_INET6);
        if (ai == NULL) {
            lwres_freeaddrinfo(*aip);
            ERR(EAI_MEMORY);
        }

        *aip = ai;
        ai->ai_socktype = socktype;
        SIN6(ai->ai_addr)->sin6_port = port;
        memcpy(&SIN6(ai->ai_addr)->sin6_addr, v6_loop, 16);
    } else {
        lwres = lwres_getaddrsbyname(lwrctx, hostname,
                         LWRES_ADDRTYPE_V6, &by);
        if (lwres != LWRES_R_SUCCESS) {
            if (lwres == LWRES_R_NOTFOUND)
                goto cleanup;
            else
                ERR(EAI_FAIL);
        }
        addr = LWRES_LIST_HEAD(by->addrs);
        while (addr != NULL) {
            ai = ai_clone(*aip, AF_INET6);
            if (ai == NULL) {
                lwres_freeaddrinfo(*aip);
                ERR(EAI_MEMORY);
            }
            *aip = ai;
            ai->ai_socktype = socktype;
            SIN6(ai->ai_addr)->sin6_port = port;
            memcpy(&SIN6(ai->ai_addr)->sin6_addr,
                   addr->address, 16);
            if (flags & AI_CANONNAME) {
                ai->ai_canonname = strdup(by->realname);
                if (ai->ai_canonname == NULL)
                    ERR(EAI_MEMORY);
            }
            addr = LWRES_LIST_NEXT(addr, link);
        }
    }
 cleanup:
    if (by != NULL)
        lwres_gabnresponse_free(lwrctx, &by);
    if (lwrctx != NULL) {
        lwres_conf_clear(lwrctx);
        lwres_context_destroy(&lwrctx);
    }
    return (result);
}

void
lwres_freeaddrinfo(struct addrinfo *ai) {
    struct addrinfo *ai_next;

    while (ai != NULL) {
        ai_next = ai->ai_next;
        if (ai->ai_addr != NULL)
            free(ai->ai_addr);
        if (ai->ai_canonname)
            free(ai->ai_canonname);
        free(ai);
        ai = ai_next;
    }
}

#ifdef AF_LOCAL
static int
get_local(const char *name, int socktype, struct addrinfo **res) {
    struct addrinfo *ai;
    struct sockaddr_un *sun;

    if (socktype == 0)
        return (EAI_SOCKTYPE);

    ai = ai_alloc(AF_LOCAL, sizeof(*sun));
    if (ai == NULL)
        return (EAI_MEMORY);

    sun = SUN(ai->ai_addr);
    strncpy(sun->sun_path, name, sizeof(sun->sun_path));

    ai->ai_socktype = socktype;
    /*
     * ai->ai_flags, ai->ai_protocol, ai->ai_canonname,
     * and ai->ai_next were initialized to zero.
     */

    *res = ai;
    return (0);
}
#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 (LWRES_PLATFORM_HAVESALEN)
 * and everything else is initialized to zero.
 */
static struct addrinfo *
ai_alloc(int family, int addrlen) {
    struct addrinfo *ai;

    ai = (struct addrinfo *)calloc(1, sizeof(*ai));
    if (ai == NULL)
        return (NULL);

    ai->ai_addr = SA(calloc(1, addrlen));
    if (ai->ai_addr == NULL) {
        free(ai);
        return (NULL);
    }
    ai->ai_addrlen = addrlen;
    ai->ai_family = family;
    ai->ai_addr->sa_family = family;
#ifdef LWRES_PLATFORM_HAVESALEN
    ai->ai_addr->sa_len = addrlen;
#endif
    return (ai);
}

static struct addrinfo *
ai_clone(struct addrinfo *oai, int family) {
    struct addrinfo *ai;

    ai = ai_alloc(family, ((family == AF_INET6) ?
        sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in)));

    if (ai == NULL) {
        lwres_freeaddrinfo(oai);
        return (NULL);
    }
    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);
}

static struct addrinfo *
ai_reverse(struct addrinfo *oai) {
    struct addrinfo *nai, *tai;

    nai = NULL;

    while (oai != NULL) {
        /*
         * 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;
    }
    return (nai);
}