fake-rfc2553.c revision eb1a5f8de9f7ea602c373a710f531abbf81141c4
1/* From openssh 4.3p2 filename openbsd-compat/fake-rfc2553.h */
2/*
3 * Copyright (C) 2000-2003 Damien Miller.  All rights reserved.
4 * Copyright (C) 1999 WIDE Project.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the project nor the names of its contributors
15 *    may be used to endorse or promote products derived from this software
16 *    without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31/*
32 * Pseudo-implementation of RFC2553 name / address resolution functions
33 *
34 * But these functions are not implemented correctly. The minimum subset
35 * is implemented for ssh use only. For example, this routine assumes
36 * that ai_family is AF_INET. Don't use it for another purpose.
37 */
38
39#include <unistd.h>
40#include <string.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include "compat/fake-rfc2553.h"
44
45#ifndef HAVE_GETNAMEINFO
46int getnameinfo(const struct sockaddr *sa, size_t ATTR_UNUSED(salen), char *host,
47                size_t hostlen, char *serv, size_t servlen, int flags)
48{
49	struct sockaddr_in *sin = (struct sockaddr_in *)sa;
50	struct hostent *hp;
51	char tmpserv[16];
52
53	if (serv != NULL) {
54		snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port));
55		if (strlcpy(serv, tmpserv, servlen) >= servlen)
56			return (EAI_MEMORY);
57	}
58
59	if (host != NULL) {
60		if (flags & NI_NUMERICHOST) {
61			if (strlcpy(host, inet_ntoa(sin->sin_addr),
62			    hostlen) >= hostlen)
63				return (EAI_MEMORY);
64			else
65				return (0);
66		} else {
67			hp = gethostbyaddr((char *)&sin->sin_addr,
68			    sizeof(struct in_addr), AF_INET);
69			if (hp == NULL)
70				return (EAI_NODATA);
71
72			if (strlcpy(host, hp->h_name, hostlen) >= hostlen)
73				return (EAI_MEMORY);
74			else
75				return (0);
76		}
77	}
78	return (0);
79}
80#endif /* !HAVE_GETNAMEINFO */
81
82#ifndef HAVE_GAI_STRERROR
83#ifdef HAVE_CONST_GAI_STRERROR_PROTO
84const char *
85#else
86char *
87#endif
88gai_strerror(int err)
89{
90	switch (err) {
91	case EAI_NODATA:
92		return ("no address associated with name");
93	case EAI_MEMORY:
94		return ("memory allocation failure.");
95	case EAI_NONAME:
96		return ("nodename nor servname provided, or not known");
97	default:
98		return ("unknown/invalid error.");
99	}
100}
101#endif /* !HAVE_GAI_STRERROR */
102
103#ifndef HAVE_FREEADDRINFO
104void
105freeaddrinfo(struct addrinfo *ai)
106{
107	struct addrinfo *next;
108
109	for(; ai != NULL;) {
110		next = ai->ai_next;
111		free(ai);
112		ai = next;
113	}
114}
115#endif /* !HAVE_FREEADDRINFO */
116
117#ifndef HAVE_GETADDRINFO
118static struct
119addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints)
120{
121	struct addrinfo *ai;
122
123	ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in));
124	if (ai == NULL)
125		return (NULL);
126
127	memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in));
128
129	ai->ai_addr = (struct sockaddr *)(ai + 1);
130	/* XXX -- ssh doesn't use sa_len */
131	ai->ai_addrlen = sizeof(struct sockaddr_in);
132	ai->ai_addr->sa_family = ai->ai_family = AF_INET;
133
134	((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port;
135	((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr;
136
137	/* XXX: the following is not generally correct, but does what we want */
138	if (hints->ai_socktype)
139		ai->ai_socktype = hints->ai_socktype;
140	else
141		ai->ai_socktype = SOCK_STREAM;
142
143	if (hints->ai_protocol)
144		ai->ai_protocol = hints->ai_protocol;
145
146	return (ai);
147}
148
149int
150getaddrinfo(const char *hostname, const char *servname,
151    const struct addrinfo *hints, struct addrinfo **res)
152{
153	struct hostent *hp;
154	struct servent *sp;
155	struct in_addr in;
156	int i;
157	long int port;
158	u_long addr;
159
160	port = 0;
161	if (servname != NULL) {
162		char *cp;
163
164		port = strtol(servname, &cp, 10);
165		if (port > 0 && port <= 65535 && *cp == '\0')
166			port = htons(port);
167		else if ((sp = getservbyname(servname, NULL)) != NULL)
168			port = sp->s_port;
169		else
170			port = 0;
171	}
172
173	if (hints && hints->ai_flags & AI_PASSIVE) {
174		addr = htonl(0x00000000);
175		if (hostname && inet_aton(hostname, &in) != 0)
176			addr = in.s_addr;
177		*res = malloc_ai(port, addr, hints);
178		if (*res == NULL)
179			return (EAI_MEMORY);
180		return (0);
181	}
182
183	if (!hostname) {
184		*res = malloc_ai(port, htonl(0x7f000001), hints);
185		if (*res == NULL)
186			return (EAI_MEMORY);
187		return (0);
188	}
189
190	if (inet_aton(hostname, &in)) {
191		*res = malloc_ai(port, in.s_addr, hints);
192		if (*res == NULL)
193			return (EAI_MEMORY);
194		return (0);
195	}
196
197	/* Don't try DNS if AI_NUMERICHOST is set */
198	if (hints && hints->ai_flags & AI_NUMERICHOST)
199		return (EAI_NONAME);
200
201	hp = gethostbyname(hostname);
202	if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) {
203		struct addrinfo *cur, *prev;
204
205		cur = prev = *res = NULL;
206		for (i = 0; hp->h_addr_list[i]; i++) {
207			struct in_addr *in = (struct in_addr *)hp->h_addr_list[i];
208
209			cur = malloc_ai(port, in->s_addr, hints);
210			if (cur == NULL) {
211				if (*res != NULL)
212					freeaddrinfo(*res);
213				return (EAI_MEMORY);
214			}
215			if (prev)
216				prev->ai_next = cur;
217			else
218				*res = cur;
219
220			prev = cur;
221		}
222		return (0);
223	}
224
225	return (EAI_NODATA);
226}
227#endif /* !HAVE_GETADDRINFO */
228