fake-rfc2553.c revision 285206
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 = calloc(1, sizeof(*ai) + sizeof(struct sockaddr_in)); 124 if (ai == NULL) 125 return (NULL); 126 127 ai->ai_addr = (struct sockaddr *)(ai + 1); 128 /* XXX -- ssh doesn't use sa_len */ 129 ai->ai_addrlen = sizeof(struct sockaddr_in); 130 ai->ai_addr->sa_family = ai->ai_family = AF_INET; 131 132 ((struct sockaddr_in *)(ai)->ai_addr)->sin_port = port; 133 ((struct sockaddr_in *)(ai)->ai_addr)->sin_addr.s_addr = addr; 134 135 /* XXX: the following is not generally correct, but does what we want */ 136 if (hints->ai_socktype) 137 ai->ai_socktype = hints->ai_socktype; 138 else 139 ai->ai_socktype = SOCK_STREAM; 140 141 if (hints->ai_protocol) 142 ai->ai_protocol = hints->ai_protocol; 143 144 return (ai); 145} 146 147int 148getaddrinfo(const char *hostname, const char *servname, 149 const struct addrinfo *hints, struct addrinfo **res) 150{ 151 struct hostent *hp; 152 struct servent *sp; 153 struct in_addr in; 154 int i; 155 long int port; 156 u_long addr; 157 158 port = 0; 159 if (servname != NULL) { 160 char *cp; 161 162 port = strtol(servname, &cp, 10); 163 if (port > 0 && port <= 65535 && *cp == '\0') 164 port = htons(port); 165 else if ((sp = getservbyname(servname, NULL)) != NULL) 166 port = sp->s_port; 167 else 168 port = 0; 169 } 170 171 if (hints && hints->ai_flags & AI_PASSIVE) { 172 addr = htonl(0x00000000); 173 if (hostname && inet_aton(hostname, &in) != 0) 174 addr = in.s_addr; 175 *res = malloc_ai(port, addr, hints); 176 if (*res == NULL) 177 return (EAI_MEMORY); 178 return (0); 179 } 180 181 if (!hostname) { 182 *res = malloc_ai(port, htonl(0x7f000001), hints); 183 if (*res == NULL) 184 return (EAI_MEMORY); 185 return (0); 186 } 187 188 if (inet_aton(hostname, &in)) { 189 *res = malloc_ai(port, in.s_addr, hints); 190 if (*res == NULL) 191 return (EAI_MEMORY); 192 return (0); 193 } 194 195 /* Don't try DNS if AI_NUMERICHOST is set */ 196 if (hints && hints->ai_flags & AI_NUMERICHOST) 197 return (EAI_NONAME); 198 199 hp = gethostbyname(hostname); 200 if (hp && hp->h_name && hp->h_name[0] && hp->h_addr_list[0]) { 201 struct addrinfo *cur, *prev; 202 203 cur = prev = *res = NULL; 204 for (i = 0; hp->h_addr_list[i]; i++) { 205 struct in_addr *in = (struct in_addr *)hp->h_addr_list[i]; 206 207 cur = malloc_ai(port, in->s_addr, hints); 208 if (cur == NULL) { 209 if (*res != NULL) 210 freeaddrinfo(*res); 211 return (EAI_MEMORY); 212 } 213 if (prev) 214 prev->ai_next = cur; 215 else 216 *res = cur; 217 218 prev = cur; 219 } 220 return (0); 221 } 222 223 return (EAI_NODATA); 224} 225#endif /* !HAVE_GETADDRINFO */ 226