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c9307018 | 1 | /* |
2 | * Copyright (C) 2000-2003 Damien Miller. All rights reserved. | |
3 | * Copyright (C) 1999 WIDE Project. All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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. | |
16 | * | |
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 | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | /* | |
31 | * Pseudo-implementation of RFC2553 name / address resolution functions | |
32 | * | |
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. | |
36 | */ | |
37 | ||
38 | #include "includes.h" | |
39 | ||
30460aeb | 40 | #include <stdlib.h> |
41 | #include <string.h> | |
42 | ||
43 | #include <netinet/in.h> | |
44 | #include <arpa/inet.h> | |
c9307018 | 45 | |
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) | |
49 | { | |
50 | struct sockaddr_in *sin = (struct sockaddr_in *)sa; | |
51 | struct hostent *hp; | |
52 | char tmpserv[16]; | |
53 | ||
5156b1a1 | 54 | if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET) |
55 | return (EAI_FAMILY); | |
c9307018 | 56 | if (serv != NULL) { |
57 | snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port)); | |
58 | if (strlcpy(serv, tmpserv, servlen) >= servlen) | |
59 | return (EAI_MEMORY); | |
60 | } | |
61 | ||
62 | if (host != NULL) { | |
63 | if (flags & NI_NUMERICHOST) { | |
64 | if (strlcpy(host, inet_ntoa(sin->sin_addr), | |
65 | hostlen) >= hostlen) | |
66 | return (EAI_MEMORY); | |
67 | else | |
68 | return (0); | |
69 | } else { | |
70 | hp = gethostbyaddr((char *)&sin->sin_addr, | |
71 | sizeof(struct in_addr), AF_INET); | |
72 | if (hp == NULL) | |
73 | return (EAI_NODATA); | |
74 | ||
75 | if (strlcpy(host, hp->h_name, hostlen) >= hostlen) | |
76 | return (EAI_MEMORY); | |
77 | else | |
78 | return (0); | |
79 | } | |
80 | } | |
81 | return (0); | |
82 | } | |
83 | #endif /* !HAVE_GETNAMEINFO */ | |
84 | ||
85 | #ifndef HAVE_GAI_STRERROR | |
ebcd87da | 86 | #ifdef HAVE_CONST_GAI_STRERROR_PROTO |
87 | const char * | |
88 | #else | |
c9307018 | 89 | char * |
ebcd87da | 90 | #endif |
c9307018 | 91 | gai_strerror(int err) |
92 | { | |
93 | switch (err) { | |
94 | case EAI_NODATA: | |
95 | return ("no address associated with name"); | |
96 | case EAI_MEMORY: | |
97 | return ("memory allocation failure."); | |
98 | case EAI_NONAME: | |
99 | return ("nodename nor servname provided, or not known"); | |
5156b1a1 | 100 | case EAI_FAMILY: |
101 | return ("ai_family not supported"); | |
c9307018 | 102 | default: |
103 | return ("unknown/invalid error."); | |
104 | } | |
105 | } | |
106 | #endif /* !HAVE_GAI_STRERROR */ | |
107 | ||
108 | #ifndef HAVE_FREEADDRINFO | |
109 | void | |
110 | freeaddrinfo(struct addrinfo *ai) | |
111 | { | |
112 | struct addrinfo *next; | |
113 | ||
114 | for(; ai != NULL;) { | |
115 | next = ai->ai_next; | |
116 | free(ai); | |
117 | ai = next; | |
118 | } | |
119 | } | |
120 | #endif /* !HAVE_FREEADDRINFO */ | |
121 | ||
122 | #ifndef HAVE_GETADDRINFO | |
123 | static struct | |
124 | addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints) | |
125 | { | |
126 | struct addrinfo *ai; | |
127 | ||
128 | ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in)); | |
129 | if (ai == NULL) | |
130 | return (NULL); | |
131 | ||
132 | memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in)); | |
133 | ||
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; | |
138 | ||
139 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; | |
140 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; | |
141 | ||
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; | |
145 | else | |
146 | ai->ai_socktype = SOCK_STREAM; | |
147 | ||
148 | if (hints->ai_protocol) | |
149 | ai->ai_protocol = hints->ai_protocol; | |
150 | ||
151 | return (ai); | |
152 | } | |
153 | ||
154 | int | |
155 | getaddrinfo(const char *hostname, const char *servname, | |
156 | const struct addrinfo *hints, struct addrinfo **res) | |
157 | { | |
158 | struct hostent *hp; | |
159 | struct servent *sp; | |
160 | struct in_addr in; | |
161 | int i; | |
162 | long int port; | |
163 | u_long addr; | |
164 | ||
165 | port = 0; | |
5156b1a1 | 166 | if (hints && hints->ai_family != AF_UNSPEC && |
167 | hints->ai_family != AF_INET) | |
168 | return (EAI_FAMILY); | |
c9307018 | 169 | if (servname != NULL) { |
170 | char *cp; | |
171 | ||
172 | port = strtol(servname, &cp, 10); | |
173 | if (port > 0 && port <= 65535 && *cp == '\0') | |
174 | port = htons(port); | |
175 | else if ((sp = getservbyname(servname, NULL)) != NULL) | |
176 | port = sp->s_port; | |
177 | else | |
178 | port = 0; | |
179 | } | |
180 | ||
181 | if (hints && hints->ai_flags & AI_PASSIVE) { | |
182 | addr = htonl(0x00000000); | |
183 | if (hostname && inet_aton(hostname, &in) != 0) | |
184 | addr = in.s_addr; | |
185 | *res = malloc_ai(port, addr, hints); | |
186 | if (*res == NULL) | |
187 | return (EAI_MEMORY); | |
188 | return (0); | |
189 | } | |
190 | ||
191 | if (!hostname) { | |
192 | *res = malloc_ai(port, htonl(0x7f000001), hints); | |
193 | if (*res == NULL) | |
194 | return (EAI_MEMORY); | |
195 | return (0); | |
196 | } | |
197 | ||
198 | if (inet_aton(hostname, &in)) { | |
199 | *res = malloc_ai(port, in.s_addr, hints); | |
200 | if (*res == NULL) | |
201 | return (EAI_MEMORY); | |
202 | return (0); | |
203 | } | |
204 | ||
205 | /* Don't try DNS if AI_NUMERICHOST is set */ | |
206 | if (hints && hints->ai_flags & AI_NUMERICHOST) | |
207 | return (EAI_NONAME); | |
208 | ||
209 | hp = gethostbyname(hostname); | |
210 | if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { | |
211 | struct addrinfo *cur, *prev; | |
212 | ||
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]; | |
216 | ||
217 | cur = malloc_ai(port, in->s_addr, hints); | |
218 | if (cur == NULL) { | |
219 | if (*res != NULL) | |
220 | freeaddrinfo(*res); | |
221 | return (EAI_MEMORY); | |
222 | } | |
223 | if (prev) | |
224 | prev->ai_next = cur; | |
225 | else | |
226 | *res = cur; | |
227 | ||
228 | prev = cur; | |
229 | } | |
230 | return (0); | |
231 | } | |
232 | ||
233 | return (EAI_NODATA); | |
234 | } | |
235 | #endif /* !HAVE_GETADDRINFO */ |