1 /* 2 * 3 * Taken from OpenSSH 3.8.1p1 4 * 5 * Copyright (C) 2000-2003 Damien Miller. All rights reserved. 6 * Copyright (C) 1999 WIDE Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Pseudo-implementation of RFC2553 name / address resolution functions 35 * 36 * But these functions are not implemented correctly. The minimum subset 37 * is implemented for ssh use only. For example, this routine assumes 38 * that ai_family is AF_INET. Don't use it for another purpose. 39 */ 40 41 #include "includes.h" 42 43 /* RCSID("$.Id: fake-rfc2553.c,v 1.5 2003/09/22 02:08:23 dtucker Exp $");*/ 44 45 #ifndef HAVE_GETNAMEINFO 46 int getnameinfo(const struct sockaddr *sa, size_t 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 84 const char * 85 #else 86 char * 87 #endif 88 gai_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 104 void 105 freeaddrinfo(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 118 static struct 119 addrinfo *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 } 148 149 int 150 getaddrinfo(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
