unbound/compat/fake-rfc2553.c

   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
  46 int 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
  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 = 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
 147 int
 148 getaddrinfo(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 */