430 lines
10 KiB
C
430 lines
10 KiB
C
/*
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* Copyright (c) 1999 - 2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: getaddrinfo.c,v 1.1.1.2 2000/08/02 19:59:48 assar Exp $");
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#endif
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#include "roken.h"
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/*
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* uses hints->ai_socktype and hints->ai_protocol
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*/
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static int
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get_port_protocol_socktype (const char *servname,
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const struct addrinfo *hints,
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int *port,
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int *protocol,
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int *socktype)
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{
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struct servent *se;
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const char *proto_str = NULL;
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*socktype = 0;
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if (hints != NULL && hints->ai_protocol != 0) {
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struct protoent *protoent = getprotobynumber (hints->ai_protocol);
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if (protoent == NULL)
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return EAI_SOCKTYPE; /* XXX */
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proto_str = protoent->p_name;
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*protocol = protoent->p_proto;
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}
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if (hints != NULL)
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*socktype = hints->ai_socktype;
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if (*socktype == SOCK_STREAM) {
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se = getservbyname (servname, proto_str ? proto_str : "tcp");
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if (proto_str == NULL)
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*protocol = IPPROTO_TCP;
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} else if (*socktype == SOCK_DGRAM) {
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se = getservbyname (servname, proto_str ? proto_str : "udp");
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if (proto_str == NULL)
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*protocol = IPPROTO_UDP;
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} else if (*socktype == 0) {
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if (proto_str != NULL) {
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se = getservbyname (servname, proto_str);
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} else {
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se = getservbyname (servname, "tcp");
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*protocol = IPPROTO_TCP;
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*socktype = SOCK_STREAM;
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if (se == NULL) {
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se = getservbyname (servname, "udp");
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*protocol = IPPROTO_UDP;
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*socktype = SOCK_DGRAM;
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}
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}
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} else
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return EAI_SOCKTYPE;
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if (se == NULL) {
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char *endstr;
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*port = htons(strtol (servname, &endstr, 10));
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if (servname == endstr)
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return EAI_NONAME;
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} else {
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*port = se->s_port;
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}
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return 0;
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}
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static int
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add_one (int port, int protocol, int socktype,
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struct addrinfo ***ptr,
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int (*func)(struct addrinfo *, void *data, int port),
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void *data,
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char *canonname)
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{
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struct addrinfo *a;
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int ret;
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a = malloc (sizeof (*a));
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if (a == NULL)
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return EAI_MEMORY;
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memset (a, 0, sizeof(*a));
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a->ai_flags = 0;
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a->ai_next = NULL;
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a->ai_protocol = protocol;
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a->ai_socktype = socktype;
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a->ai_canonname = canonname;
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ret = (*func)(a, data, port);
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if (ret) {
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free (a);
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return ret;
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}
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**ptr = a;
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*ptr = &a->ai_next;
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return 0;
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}
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static int
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const_v4 (struct addrinfo *a, void *data, int port)
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{
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struct sockaddr_in *sin;
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struct in_addr *addr = (struct in_addr *)data;
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a->ai_family = PF_INET;
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a->ai_addrlen = sizeof(*sin);
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a->ai_addr = malloc (sizeof(*sin));
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if (a->ai_addr == NULL)
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return EAI_MEMORY;
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sin = (struct sockaddr_in *)a->ai_addr;
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memset (sin, 0, sizeof(*sin));
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sin->sin_family = AF_INET;
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sin->sin_port = port;
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sin->sin_addr = *addr;
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return 0;
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}
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#ifdef HAVE_IPV6
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static int
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const_v6 (struct addrinfo *a, void *data, int port)
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{
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struct sockaddr_in6 *sin6;
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struct in6_addr *addr = (struct in6_addr *)data;
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a->ai_family = PF_INET6;
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a->ai_addrlen = sizeof(*sin6);
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a->ai_addr = malloc (sizeof(*sin6));
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if (a->ai_addr == NULL)
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return EAI_MEMORY;
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sin6 = (struct sockaddr_in6 *)a->ai_addr;
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memset (sin6, 0, sizeof(*sin6));
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = port;
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sin6->sin6_addr = *addr;
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return 0;
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}
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#endif
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static int
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get_null (const struct addrinfo *hints,
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int port, int protocol, int socktype,
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struct addrinfo **res)
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{
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struct in_addr v4_addr;
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#ifdef HAVE_IPV6
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struct in6_addr v6_addr;
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#endif
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struct addrinfo *first = NULL;
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struct addrinfo **current = &first;
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int family = PF_UNSPEC;
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int ret;
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if (hints != NULL)
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family = hints->ai_family;
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if (hints && hints->ai_flags & AI_PASSIVE) {
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v4_addr.s_addr = INADDR_ANY;
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#ifdef HAVE_IPV6
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v6_addr = in6addr_any;
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#endif
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} else {
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v4_addr.s_addr = htonl(INADDR_LOOPBACK);
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#ifdef HAVE_IPV6
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v6_addr = in6addr_loopback;
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#endif
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}
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#ifdef HAVE_IPV6
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if (family == PF_INET6 || family == PF_UNSPEC) {
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ret = add_one (port, protocol, socktype,
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¤t, const_v6, &v6_addr, NULL);
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}
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#endif
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if (family == PF_INET || family == PF_UNSPEC) {
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ret = add_one (port, protocol, socktype,
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¤t, const_v4, &v4_addr, NULL);
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}
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*res = first;
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return 0;
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}
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/*
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* Try to find a fqdn (with `.') in he if possible, else return h_name
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*/
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static char *
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find_fqdn (const struct hostent *he)
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{
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char *ret = he->h_name;
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char **h;
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if (strchr (ret, '.') == NULL)
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for (h = he->h_aliases; *h; ++h) {
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if (strchr (*h, '.') != NULL) {
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ret = *h;
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break;
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}
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}
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return ret;
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}
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static int
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add_hostent (int port, int protocol, int socktype,
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struct addrinfo ***current,
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int (*func)(struct addrinfo *, void *data, int port),
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struct hostent *he, int *flags)
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{
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int ret;
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char *canonname = NULL;
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char **h;
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if (*flags & AI_CANONNAME) {
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struct hostent *he2 = NULL;
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canonname = find_fqdn (he);
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if (strchr (canonname, '.') == NULL) {
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int error;
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he2 = getipnodebyaddr (he->h_addr_list[0], he->h_length,
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he->h_addrtype, &error);
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if (he2 != NULL) {
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char *tmp = find_fqdn (he2);
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if (strchr (tmp, '.') != NULL)
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canonname = tmp;
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}
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}
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canonname = strdup (canonname);
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if (he2 != NULL)
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freehostent (he2);
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if (canonname == NULL)
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return EAI_MEMORY;
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}
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for (h = he->h_addr_list; *h != NULL; ++h) {
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ret = add_one (port, protocol, socktype,
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current, func, *h, canonname);
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if (ret)
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return ret;
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if (*flags & AI_CANONNAME) {
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*flags &= ~AI_CANONNAME;
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canonname = NULL;
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}
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}
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return 0;
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}
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static int
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get_number (const char *nodename,
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const struct addrinfo *hints,
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int port, int protocol, int socktype,
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struct addrinfo **res)
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{
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struct addrinfo *first = NULL;
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struct addrinfo **current = &first;
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int family = PF_UNSPEC;
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int ret;
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if (hints != NULL) {
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family = hints->ai_family;
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}
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#ifdef HAVE_IPV6
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if (family == PF_INET6 || family == PF_UNSPEC) {
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struct in6_addr v6_addr;
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if (inet_pton (PF_INET6, nodename, &v6_addr) == 1) {
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ret = add_one (port, protocol, socktype,
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¤t, const_v6, &v6_addr, NULL);
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*res = first;
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return ret;
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}
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}
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#endif
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if (family == PF_INET || family == PF_UNSPEC) {
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struct in_addr v4_addr;
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if (inet_pton (PF_INET, nodename, &v4_addr) == 1) {
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ret = add_one (port, protocol, socktype,
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¤t, const_v4, &v4_addr, NULL);
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*res = first;
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return ret;
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}
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}
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return EAI_NONAME;
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}
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static int
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get_nodes (const char *nodename,
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const struct addrinfo *hints,
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int port, int protocol, int socktype,
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struct addrinfo **res)
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{
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struct addrinfo *first = NULL;
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struct addrinfo **current = &first;
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int family = PF_UNSPEC;
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int flags = 0;
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int ret = EAI_NONAME;
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int error;
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if (hints != NULL) {
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family = hints->ai_family;
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flags = hints->ai_flags;
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}
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#ifdef HAVE_IPV6
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if (family == PF_INET6 || family == PF_UNSPEC) {
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struct hostent *he;
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he = getipnodebyname (nodename, PF_INET6, 0, &error);
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if (he != NULL) {
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ret = add_hostent (port, protocol, socktype,
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¤t, const_v6, he, &flags);
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freehostent (he);
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}
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}
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#endif
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if (family == PF_INET || family == PF_UNSPEC) {
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struct hostent *he;
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he = getipnodebyname (nodename, PF_INET, 0, &error);
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if (he != NULL) {
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ret = add_hostent (port, protocol, socktype,
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¤t, const_v4, he, &flags);
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freehostent (he);
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}
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}
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*res = first;
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return ret;
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}
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/*
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* hints:
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*
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* struct addrinfo {
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* int ai_flags;
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* int ai_family;
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* int ai_socktype;
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* int ai_protocol;
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* ...
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* };
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*/
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int
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getaddrinfo(const char *nodename,
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const char *servname,
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const struct addrinfo *hints,
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struct addrinfo **res)
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{
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int ret;
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int port = 0;
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int protocol = 0;
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int socktype = 0;
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*res = NULL;
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if (servname == NULL && nodename == NULL)
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return EAI_NONAME;
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if (hints != NULL
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&& hints->ai_family != PF_UNSPEC
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&& hints->ai_family != PF_INET
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#ifdef HAVE_IPV6
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&& hints->ai_family != PF_INET6
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#endif
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)
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return EAI_FAMILY;
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if (servname != NULL) {
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ret = get_port_protocol_socktype (servname, hints,
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&port, &protocol, &socktype);
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if (ret)
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return ret;
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}
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if (nodename != NULL) {
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ret = get_number (nodename, hints, port, protocol, socktype, res);
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if (ret) {
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if(hints && hints->ai_flags & AI_NUMERICHOST)
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ret = EAI_NONAME;
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else
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ret = get_nodes (nodename, hints, port, protocol, socktype,
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res);
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}
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} else {
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ret = get_null (hints, port, protocol, socktype, res);
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}
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if (ret)
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freeaddrinfo (*res);
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return ret;
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}
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