authd/getnameinfo.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * 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  * Issues to be discussed:
  32  * - Thread safe-ness must be checked
  33  * - RFC2553 says that we should raise error on short buffer.  X/Open says
  34  *   we need to truncate the result.  We obey RFC2553 (and X/Open should be
  35  *   modified).  ipngwg rough consensus seems to follow RFC2553.
  36  * - What is "local" in NI_FQDN?
  37  * - NI_NAMEREQD and NI_NUMERICHOST conflict with each other.
  38  * - (KAME extension) always attach textual scopeid (fe80::1%lo0), if
  39  *   sin6_scope_id is filled - standardization status?
  40  *   XXX breaks backward compat for code that expects no scopeid.
  41  *   beware on merge.
  42  */
  43
  44 #ifdef _WIN32
  45 #include <rb_lib.h>
  46 #include "getaddrinfo.h"
  47 #include "getnameinfo.h"
  48
  49 static const struct afd {
  50   int a_af;
  51   int a_addrlen;
  52   rb_socklen_t a_socklen;
  53   int a_off;
  54 } afdl [] = {
  55 #ifdef IPV6
  56     {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
  57              offsetof(struct sockaddr_in6, sin6_addr)},
  58 #endif
  59     {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
  60             offsetof(struct sockaddr_in, sin_addr)},
  61     {0, 0, 0, 0},
  62 };
  63
  64 struct sockinet
  65 {
  66   unsigned char si_len;
  67   unsigned char si_family;
  68   unsigned short si_port;
  69 };
  70
  71 #ifdef IPV6
  72 static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
  73     size_t, int);
  74 #endif
  75
  76 int
  77 rb_getnameinfo(const struct sockaddr *sa, rb_socklen_t salen, char *host,
  78                 size_t hostlen, char *serv, size_t servlen, int flags)
  79 {
  80   const struct afd *afd;
  81   struct servent *sp;
  82   unsigned short port;
  83   int family, i;
  84   const char *addr;
  85   uint32_t v4a;
  86   char numserv[512];
  87   char numaddr[512];
  88
  89   if (sa == NULL)
  90     return EAI_FAIL;
  91
  92 /*      if (sa->sa_len != salen)
  93                 return EAI_FAIL;
  94 */
  95         family = sa->sa_family;
  96         for (i = 0; afdl[i].a_af; i++)
  97                 if (afdl[i].a_af == family) {
  98                         afd = &afdl[i];
  99                         goto found;
 100                 }
 101         return EAI_FAMILY;
 102
 103  found:
 104         if (salen != afd->a_socklen)
 105                 return EAI_FAIL;
 106
 107         /* network byte order */
 108         port = ((const struct sockinet *)sa)->si_port;
 109         addr = (const char *)sa + afd->a_off;
 110
 111         if (serv == NULL || servlen == 0) {
 112                 /*
 113                  * do nothing in this case.
 114                  * in case you are wondering if "&&" is more correct than
 115                  * "||" here: rfc2553bis-03 says that serv == NULL OR
 116                  * servlen == 0 means that the caller does not want the result.
 117                  */
 118         } else {
 119                 if (flags & NI_NUMERICSERV)
 120                         sp = NULL;
 121                 else {
 122                         sp = getservbyport(port,
 123                                 (flags & NI_DGRAM) ? "udp" : "tcp");
 124                 }
 125                 if (sp) {
 126                         if (strlen(sp->s_name) + 1 > servlen)
 127                                 return EAI_MEMORY;
 128                         rb_strlcpy(serv, sp->s_name, servlen);
 129                 } else {
 130                         snprintf(numserv, sizeof(numserv), "%u", ntohs(port));
 131                         if (strlen(numserv) + 1 > servlen)
 132                                 return EAI_MEMORY;
 133                         rb_strlcpy(serv, numserv, servlen);
 134                 }
 135         }
 136
 137         switch (sa->sa_family) {
 138         case AF_INET:
 139                 v4a = (uint32_t)
 140                     ntohl(((const struct sockaddr_in *)sa)->sin_addr.s_addr);
 141                 if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
 142                         flags |= NI_NUMERICHOST;
 143                 v4a >>= IN_CLASSA_NSHIFT;
 144                 if (v4a == 0)
 145                         flags |= NI_NUMERICHOST;
 146                 break;
 147 #ifdef IPV6
 148         case AF_INET6:
 149             {
 150                 const struct sockaddr_in6 *sin6;
 151                 sin6 = (const struct sockaddr_in6 *)sa;
 152                 switch (sin6->sin6_addr.s6_addr[0]) {
 153                 case 0x00:
 154                         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 155                                 ;
 156                         else if (IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr))
 157                                 ;
 158                         else
 159                                 flags |= NI_NUMERICHOST;
 160                         break;
 161                 default:
 162                         if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
 163                                 flags |= NI_NUMERICHOST;
 164                         }
 165                         else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
 166                                 flags |= NI_NUMERICHOST;
 167                         break;
 168                 }
 169             }
 170                 break;
 171 #endif
 172         }
 173         if (host == NULL || hostlen == 0) {
 174                 /*
 175                  * do nothing in this case.
 176                  * in case you are wondering if "&&" is more correct than
 177                  * "||" here: rfc2553bis-03 says that host == NULL or
 178                  * hostlen == 0 means that the caller does not want the result.
 179                  */
 180         } else if (flags & NI_NUMERICHOST) {
 181                 size_t numaddrlen;
 182
 183                 /* NUMERICHOST and NAMEREQD conflicts with each other */
 184                 if (flags & NI_NAMEREQD)
 185                         return EAI_NONAME;
 186
 187                 switch(afd->a_af) {
 188 #ifdef IPV6
 189                 case AF_INET6:
 190                 {
 191                         int error;
 192
 193                         if ((error = ip6_parsenumeric(sa, addr, host,
 194                                                       hostlen, flags)) != 0)
 195                                 return(error);
 196                         break;
 197                 }
 198 #endif
 199                 default:
 200                         if (rb_inet_ntop(afd->a_af, addr, numaddr, sizeof(numaddr))
 201                             == NULL)
 202                                 return EAI_SYSTEM;
 203                         numaddrlen = strlen(numaddr);
 204                         if (numaddrlen + 1 > hostlen) /* don't forget terminator */
 205                                 return EAI_MEMORY;
 206                         rb_strlcpy(host, numaddr, hostlen);
 207                         break;
 208                 }
 209         }
 210         return(0);
 211 }
 212
 213 #ifdef IPV6
 214 static int
 215 ip6_parsenumeric(const struct sockaddr *sa, const char *addr,
 216                  char *host, size_t hostlen, int flags)
 217 {
 218   size_t numaddrlen;
 219   char numaddr[512];
 220
 221   if (rb_inet_ntop(AF_INET6, addr, numaddr, sizeof(numaddr)) == NULL)
 222     return(EAI_SYSTEM);
 223
 224   numaddrlen = strlen(numaddr);
 225
 226   if (numaddrlen + 1 > hostlen) /* don't forget terminator */
 227     return(EAI_MEMORY);
 228
 229   if (*numaddr == ':')
 230   {
 231     *host = '0';
 232     rb_strlcpy(host+1, numaddr, hostlen-1);
 233   }
 234   else
 235     rb_strlcpy(host, numaddr, hostlen);
 236
 237   return(0);
 238 }
 239 #endif
 240 #endif