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f5827134 | 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 | ||
48e671d5 | 30 | /* |
52d58495 | 31 | * Pseudo-implementation of RFC2553 name / address resolution functions |
48e671d5 | 32 | * |
33 | * But these functions are not implemented correctly. The minimum subset | |
5e24e4a5 | 34 | * is implemented for ssh use only. For example, this routine assumes |
48e671d5 | 35 | * that ai_family is AF_INET. Don't use it for another purpose. |
48e671d5 | 36 | */ |
37 | ||
4ed465ec | 38 | #include "includes.h" |
39 | ||
52d58495 | 40 | #ifndef HAVE_GETNAMEINFO |
41 | int getnameinfo(const struct sockaddr *sa, size_t salen, char *host, | |
42 | size_t hostlen, char *serv, size_t servlen, int flags) | |
43 | { | |
44 | struct sockaddr_in *sin = (struct sockaddr_in *)sa; | |
45 | struct hostent *hp; | |
46 | char tmpserv[16]; | |
47 | ||
48 | if (serv != NULL) { | |
49 | snprintf(tmpserv, sizeof(tmpserv), "%d", ntohs(sin->sin_port)); | |
50 | if (strlcpy(serv, tmpserv, servlen) >= servlen) | |
51 | return (EAI_MEMORY); | |
52 | } | |
53 | ||
54 | if (host != NULL) { | |
55 | if (flags & NI_NUMERICHOST) { | |
56 | if (strlcpy(host, inet_ntoa(sin->sin_addr), | |
57 | hostlen) >= hostlen) | |
58 | return (EAI_MEMORY); | |
59 | else | |
60 | return (0); | |
61 | } else { | |
62 | hp = gethostbyaddr((char *)&sin->sin_addr, | |
63 | sizeof(struct in_addr), AF_INET); | |
64 | if (hp == NULL) | |
65 | return (EAI_NODATA); | |
66 | ||
67 | if (strlcpy(host, hp->h_name, hostlen) >= hostlen) | |
68 | return (EAI_MEMORY); | |
69 | else | |
70 | return (0); | |
71 | } | |
72 | } | |
73 | return (0); | |
74 | } | |
75 | #endif /* !HAVE_GETNAMEINFO */ | |
76 | ||
48e671d5 | 77 | #ifndef HAVE_GAI_STRERROR |
1a086f97 | 78 | #ifdef HAVE_CONST_GAI_STRERROR_PROTO |
79 | const char * | |
80 | #else | |
9901cb37 | 81 | char * |
1a086f97 | 82 | #endif |
9901cb37 | 83 | gai_strerror(int err) |
48e671d5 | 84 | { |
9901cb37 | 85 | switch (err) { |
86 | case EAI_NODATA: | |
87 | return ("no address associated with name"); | |
88 | case EAI_MEMORY: | |
89 | return ("memory allocation failure."); | |
02e2a074 | 90 | case EAI_NONAME: |
91 | return ("nodename nor servname provided, or not known"); | |
9901cb37 | 92 | default: |
93 | return ("unknown/invalid error."); | |
5daf7064 | 94 | } |
48e671d5 | 95 | } |
96 | #endif /* !HAVE_GAI_STRERROR */ | |
97 | ||
98 | #ifndef HAVE_FREEADDRINFO | |
9901cb37 | 99 | void |
100 | freeaddrinfo(struct addrinfo *ai) | |
48e671d5 | 101 | { |
5daf7064 | 102 | struct addrinfo *next; |
103 | ||
0509a052 | 104 | for(; ai != NULL;) { |
105 | next = ai->ai_next; | |
5daf7064 | 106 | free(ai); |
9901cb37 | 107 | ai = next; |
108 | } | |
48e671d5 | 109 | } |
110 | #endif /* !HAVE_FREEADDRINFO */ | |
111 | ||
112 | #ifndef HAVE_GETADDRINFO | |
9901cb37 | 113 | static struct |
114 | addrinfo *malloc_ai(int port, u_long addr, const struct addrinfo *hints) | |
48e671d5 | 115 | { |
5daf7064 | 116 | struct addrinfo *ai; |
117 | ||
d6bd2b5a | 118 | ai = malloc(sizeof(*ai) + sizeof(struct sockaddr_in)); |
119 | if (ai == NULL) | |
120 | return (NULL); | |
5daf7064 | 121 | |
9901cb37 | 122 | memset(ai, '\0', sizeof(*ai) + sizeof(struct sockaddr_in)); |
5daf7064 | 123 | |
124 | ai->ai_addr = (struct sockaddr *)(ai + 1); | |
125 | /* XXX -- ssh doesn't use sa_len */ | |
126 | ai->ai_addrlen = sizeof(struct sockaddr_in); | |
127 | ai->ai_addr->sa_family = ai->ai_family = AF_INET; | |
48e671d5 | 128 | |
5daf7064 | 129 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; |
130 | ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; | |
131 | ||
b1848832 | 132 | /* XXX: the following is not generally correct, but does what we want */ |
133 | if (hints->ai_socktype) | |
134 | ai->ai_socktype = hints->ai_socktype; | |
135 | else | |
136 | ai->ai_socktype = SOCK_STREAM; | |
137 | ||
138 | if (hints->ai_protocol) | |
139 | ai->ai_protocol = hints->ai_protocol; | |
140 | ||
9901cb37 | 141 | return (ai); |
48e671d5 | 142 | } |
143 | ||
9901cb37 | 144 | int |
145 | getaddrinfo(const char *hostname, const char *servname, | |
146 | const struct addrinfo *hints, struct addrinfo **res) | |
48e671d5 | 147 | { |
5daf7064 | 148 | struct hostent *hp; |
ecc03386 | 149 | struct servent *sp; |
9c13d877 | 150 | struct in_addr in; |
ecc03386 | 151 | int i; |
152 | long int port; | |
62086365 | 153 | u_long addr; |
5daf7064 | 154 | |
ecc03386 | 155 | port = 0; |
156 | if (servname != NULL) { | |
157 | char *cp; | |
158 | ||
159 | port = strtol(servname, &cp, 10); | |
160 | if (port > 0 && port <= 65535 && *cp == '\0') | |
161 | port = htons(port); | |
162 | else if ((sp = getservbyname(servname, NULL)) != NULL) | |
163 | port = sp->s_port; | |
164 | else | |
165 | port = 0; | |
166 | } | |
5daf7064 | 167 | |
168 | if (hints && hints->ai_flags & AI_PASSIVE) { | |
62086365 | 169 | addr = htonl(0x00000000); |
170 | if (hostname && inet_aton(hostname, &in) != 0) | |
171 | addr = in.s_addr; | |
9901cb37 | 172 | *res = malloc_ai(port, addr, hints); |
d6bd2b5a | 173 | if (*res == NULL) |
174 | return (EAI_MEMORY); | |
9901cb37 | 175 | return (0); |
5daf7064 | 176 | } |
177 | ||
178 | if (!hostname) { | |
9901cb37 | 179 | *res = malloc_ai(port, htonl(0x7f000001), hints); |
d6bd2b5a | 180 | if (*res == NULL) |
181 | return (EAI_MEMORY); | |
9901cb37 | 182 | return (0); |
5daf7064 | 183 | } |
184 | ||
dc2a6d09 | 185 | if (inet_aton(hostname, &in)) { |
9901cb37 | 186 | *res = malloc_ai(port, in.s_addr, hints); |
d6bd2b5a | 187 | if (*res == NULL) |
188 | return (EAI_MEMORY); | |
9901cb37 | 189 | return (0); |
5daf7064 | 190 | } |
191 | ||
02e2a074 | 192 | /* Don't try DNS if AI_NUMERICHOST is set */ |
193 | if (hints && hints->ai_flags & AI_NUMERICHOST) | |
194 | return (EAI_NONAME); | |
195 | ||
5daf7064 | 196 | hp = gethostbyname(hostname); |
197 | if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { | |
9901cb37 | 198 | struct addrinfo *cur, *prev; |
199 | ||
d6bd2b5a | 200 | cur = prev = *res = NULL; |
5daf7064 | 201 | for (i = 0; hp->h_addr_list[i]; i++) { |
9901cb37 | 202 | struct in_addr *in = (struct in_addr *)hp->h_addr_list[i]; |
203 | ||
204 | cur = malloc_ai(port, in->s_addr, hints); | |
d6bd2b5a | 205 | if (cur == NULL) { |
206 | if (*res != NULL) | |
207 | freeaddrinfo(*res); | |
208 | return (EAI_MEMORY); | |
209 | } | |
5daf7064 | 210 | if (prev) |
211 | prev->ai_next = cur; | |
212 | else | |
213 | *res = cur; | |
214 | ||
215 | prev = cur; | |
216 | } | |
9901cb37 | 217 | return (0); |
5daf7064 | 218 | } |
219 | ||
9901cb37 | 220 | return (EAI_NODATA); |
48e671d5 | 221 | } |
222 | #endif /* !HAVE_GETADDRINFO */ |