AppPkg/Applications/Python/Python-2.7.2/Modules/getnameinfo.c

   1 /** @file
   2   Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   3   This program and the accompanying materials are licensed and made available under
   4   the terms and conditions of the BSD License that accompanies this distribution.
   5   The full text of the license may be found at
   6   http://opensource.org/licenses/bsd-license.php.
   7
   8   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   9   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  10
  11
  12  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  13  * All rights reserved.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. Neither the name of the project nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38
  39  * Issues to be discussed:
  40  * - Thread safe-ness must be checked
  41  * - Return values.  There seems to be no standard for return value (RFC2133)
  42  *   but INRIA implementation returns EAI_xxx defined for getaddrinfo().
  43 **/
  44
  45 #if 0
  46 #include <sys/types.h>
  47 #include <sys/socket.h>
  48 #include <netinet/in.h>
  49 #include <arpa/inet.h>
  50 #include <arpa/nameser.h>
  51 #include <netdb.h>
  52 #include <resolv.h>
  53 #include <string.h>
  54 #include <stddef.h>
  55
  56 #include "addrinfo.h"
  57 #endif
  58
  59 #define SUCCESS 0
  60 #define YES 1
  61 #define NO  0
  62
  63 static struct gni_afd {
  64     int a_af;
  65     int a_addrlen;
  66     int a_socklen;
  67     int a_off;
  68 } gni_afdl [] = {
  69 #ifdef ENABLE_IPV6
  70     {PF_INET6, sizeof(struct in6_addr), sizeof(struct sockaddr_in6),
  71         offsetof(struct sockaddr_in6, sin6_addr)},
  72 #endif
  73     {PF_INET, sizeof(struct in_addr), sizeof(struct sockaddr_in),
  74         offsetof(struct sockaddr_in, sin_addr)},
  75     {0, 0, 0},
  76 };
  77
  78 struct gni_sockinet {
  79     u_char      si_len;
  80     u_char      si_family;
  81     u_short     si_port;
  82 };
  83
  84 #define ENI_NOSOCKET    0
  85 #define ENI_NOSERVNAME  1
  86 #define ENI_NOHOSTNAME  2
  87 #define ENI_MEMORY      3
  88 #define ENI_SYSTEM      4
  89 #define ENI_FAMILY      5
  90 #define ENI_SALEN       6
  91
  92 /* forward declaration to make gcc happy */
  93 int getnameinfo Py_PROTO((const struct sockaddr *, size_t, char *, size_t,
  94                           char *, size_t, int));
  95
  96 int
  97 getnameinfo(sa, salen, host, hostlen, serv, servlen, flags)
  98     const struct sockaddr *sa;
  99     size_t salen;
 100     char *host;
 101     size_t hostlen;
 102     char *serv;
 103     size_t servlen;
 104     int flags;
 105 {
 106     struct gni_afd *gni_afd;
 107     struct servent *sp;
 108     struct hostent *hp;
 109     u_short port;
 110     int family, len, i;
 111     char *addr, *p;
 112     u_long v4a;
 113 #ifdef ENABLE_IPV6
 114     u_char pfx;
 115     int h_error;
 116 #endif
 117     char numserv[512];
 118     char numaddr[512];
 119
 120     if (sa == NULL)
 121         return ENI_NOSOCKET;
 122
 123 #ifdef HAVE_SOCKADDR_SA_LEN
 124     len = sa->sa_len;
 125     if (len != salen) return ENI_SALEN;
 126 #else
 127     len = salen;
 128 #endif
 129
 130     family = sa->sa_family;
 131     for (i = 0; gni_afdl[i].a_af; i++)
 132         if (gni_afdl[i].a_af == family) {
 133             gni_afd = &gni_afdl[i];
 134             goto found;
 135         }
 136     return ENI_FAMILY;
 137
 138  found:
 139     if (len != gni_afd->a_socklen) return ENI_SALEN;
 140
 141     port = ((struct gni_sockinet *)sa)->si_port; /* network byte order */
 142     addr = (char *)sa + gni_afd->a_off;
 143
 144     if (serv == NULL || servlen == 0) {
 145         /* what we should do? */
 146     } else if (flags & NI_NUMERICSERV) {
 147         sprintf(numserv, "%d", ntohs(port));
 148         if (strlen(numserv) > servlen)
 149             return ENI_MEMORY;
 150         strcpy(serv, numserv);
 151     } else {
 152         sp = getservbyport(port, (flags & NI_DGRAM) ? "udp" : "tcp");
 153         if (sp) {
 154             if (strlen(sp->s_name) > servlen)
 155                 return ENI_MEMORY;
 156             strcpy(serv, sp->s_name);
 157         } else
 158             return ENI_NOSERVNAME;
 159     }
 160
 161     switch (sa->sa_family) {
 162     case AF_INET:
 163         v4a = ((struct sockaddr_in *)sa)->sin_addr.s_addr;
 164         if (IN_MULTICAST(v4a) || IN_EXPERIMENTAL(v4a))
 165             flags |= NI_NUMERICHOST;
 166         v4a >>= IN_CLASSA_NSHIFT;
 167         if (v4a == 0 || v4a == IN_LOOPBACKNET)
 168             flags |= NI_NUMERICHOST;
 169         break;
 170 #ifdef ENABLE_IPV6
 171     case AF_INET6:
 172         pfx = ((struct sockaddr_in6 *)sa)->sin6_addr.s6_addr8[0];
 173         if (pfx == 0 || pfx == 0xfe || pfx == 0xff)
 174             flags |= NI_NUMERICHOST;
 175         break;
 176 #endif
 177     }
 178     if (host == NULL || hostlen == 0) {
 179         /* what should we do? */
 180     } else if (flags & NI_NUMERICHOST) {
 181         if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
 182             == NULL)
 183             return ENI_SYSTEM;
 184         if (strlen(numaddr) > hostlen)
 185             return ENI_MEMORY;
 186         strcpy(host, numaddr);
 187     } else {
 188 #ifdef ENABLE_IPV6
 189         hp = getipnodebyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af, &h_error);
 190 #else
 191         hp = gethostbyaddr(addr, gni_afd->a_addrlen, gni_afd->a_af);
 192         //h_error = h_errno;
 193 #endif
 194
 195         if (hp) {
 196             if (flags & NI_NOFQDN) {
 197                 p = strchr(hp->h_name, '.');
 198                 if (p) *p = '\0';
 199             }
 200             if (strlen(hp->h_name) > hostlen) {
 201 #ifdef ENABLE_IPV6
 202                 freehostent(hp);
 203 #endif
 204                 return ENI_MEMORY;
 205             }
 206             strcpy(host, hp->h_name);
 207 #ifdef ENABLE_IPV6
 208             freehostent(hp);
 209 #endif
 210         } else {
 211             if (flags & NI_NAMEREQD)
 212                 return ENI_NOHOSTNAME;
 213             if (inet_ntop(gni_afd->a_af, addr, numaddr, sizeof(numaddr))
 214                 == NULL)
 215                 return ENI_NOHOSTNAME;
 216             if (strlen(numaddr) > hostlen)
 217                 return ENI_MEMORY;
 218             strcpy(host, numaddr);
 219         }
 220     }
 221     return SUCCESS;
 222 }