2 * Copyright (C) 2000-2003 Damien Miller. All rights reserved.
3 * Copyright (C) 1999 WIDE Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Pseudo-implementation of RFC2553 name / address resolution functions
33 * But these functions are not implemented correctly. The minimum subset
34 * is implemented for ssh use only. For example, this routine assumes
35 * that ai_family is AF_INET. Don't use it for another purpose.
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
46 #ifndef HAVE_GETNAMEINFO
47 int getnameinfo(const struct sockaddr *sa, size_t salen, char *host,
48 size_t hostlen, char *serv, size_t servlen, int flags)
50 struct sockaddr_in *sin = (struct sockaddr_in *)sa;
54 if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET)
57 snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
58 if (strlcpy(serv, tmpserv, servlen) >= servlen)
63 if (flags & NI_NUMERICHOST) {
64 if (strlcpy(host, inet_ntoa(sin->sin_addr),
70 hp = gethostbyaddr((char *)&sin->sin_addr,
71 sizeof(struct in_addr), AF_INET);
75 if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
83 #endif /* !HAVE_GETNAMEINFO */
85 #ifndef HAVE_GAI_STRERROR
86 #ifdef HAVE_CONST_GAI_STRERROR_PROTO
95 return ("no address associated with name");
97 return ("memory allocation failure.");
99 return ("nodename nor servname provided, or not known");
101 return ("ai_family not supported");
103 return ("unknown/invalid error.");
106 #endif /* !HAVE_GAI_STRERROR */
108 #ifndef HAVE_FREEADDRINFO
110 freeaddrinfo(struct addrinfo *ai)
112 struct addrinfo *next;
120 #endif /* !HAVE_FREEADDRINFO */
122 #ifndef HAVE_GETADDRINFO
124 addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints)
128 ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
132 memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
134 ai->ai_addr = (struct sockaddr *)(ai + 1);
135 /* XXX -- ssh doesn't use sa_len */
136 ai->ai_addrlen = sizeof(struct sockaddr_in);
137 ai->ai_addr->sa_family = ai->ai_family = AF_INET;
139 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
140 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
142 /* XXX: the following is not generally correct, but does what we want */
143 if (hints->ai_socktype)
144 ai->ai_socktype = hints->ai_socktype;
146 ai->ai_socktype = SOCK_STREAM;
148 if (hints->ai_protocol)
149 ai->ai_protocol = hints->ai_protocol;
155 getaddrinfo(const char *hostname, const char *servname,
156 const struct addrinfo *hints, struct addrinfo **res)
166 if (hints && hints->ai_family != AF_UNSPEC &&
167 hints->ai_family != AF_INET)
169 if (servname != NULL) {
172 port = strtol(servname, &cp, 10);
173 if (port > 0 && port <= 65535 && *cp == '\0')
175 else if ((sp = getservbyname(servname, NULL)) != NULL)
181 if (hints && hints->ai_flags & AI_PASSIVE) {
182 addr = htonl(0x00000000);
183 if (hostname && inet_aton(hostname, &in) != 0)
185 *res = malloc_ai(port, addr, hints);
192 *res = malloc_ai(port, htonl(0x7f000001), hints);
198 if (inet_aton(hostname, &in)) {
199 *res = malloc_ai(port, in.s_addr, hints);
205 /* Don't try DNS if AI_NUMERICHOST is set */
206 if (hints && hints->ai_flags & AI_NUMERICHOST)
209 hp = gethostbyname(hostname);
210 if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
211 struct addrinfo *cur, *prev;
213 cur = prev = *res = NULL;
214 for (i = 0; hp->h_addr_list[i]; i++) {
215 struct in_addr *in = (struct in_addr *)hp->h_addr_list[i];
217 cur = malloc_ai(port, in->s_addr, hints);
235 #endif /* !HAVE_GETADDRINFO */