lib/libc/net/getnetnamadr.c

   1 /*-
   2  * Copyright (c) 1994, Garrett Wollman
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  * $FreeBSD: src/lib/libc/net/getnetnamadr.c,v 1.12.2.1 2001/03/05 10:47:08 obrien Exp $
  26  * $DragonFly: src/lib/libc/net/getnetnamadr.c,v 1.3 2004/10/25 19:38:01 drhodus Exp $
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <arpa/inet.h>
  33 #include <netdb.h>
  34 #include <stdio.h>
  35 #include <ctype.h>
  36 #include <string.h>
  37
  38 #ifndef _PATH_NETCONF
  39 #define _PATH_NETCONF   "/etc/host.conf"
  40 #endif
  41
  42 enum service_type {
  43   SERVICE_NONE = 0,
  44   SERVICE_BIND,
  45   SERVICE_TABLE,
  46   SERVICE_NIS };
  47 #define SERVICE_MAX     SERVICE_NIS
  48
  49 static struct {
  50   const char *name;
  51   enum service_type type;
  52 } service_names[] = {
  53   { "hosts", SERVICE_TABLE },
  54   { "/etc/hosts", SERVICE_TABLE },
  55   { "hosttable", SERVICE_TABLE },
  56   { "htable", SERVICE_TABLE },
  57   { "bind", SERVICE_BIND },
  58   { "dns", SERVICE_BIND },
  59   { "domain", SERVICE_BIND },
  60   { "yp", SERVICE_NIS },
  61   { "yellowpages", SERVICE_NIS },
  62   { "nis", SERVICE_NIS },
  63   { 0, SERVICE_NONE }
  64 };
  65
  66 static enum service_type service_order[SERVICE_MAX + 1];
  67 static int service_done = 0;
  68
  69 static enum service_type
  70 get_service_name(const char *name) {
  71         int i;
  72         for(i = 0; service_names[i].type != SERVICE_NONE; i++) {
  73                 if(!strcasecmp(name, service_names[i].name)) {
  74                         return service_names[i].type;
  75                 }
  76         }
  77         return SERVICE_NONE;
  78 }
  79
  80 static void
  81 init_services()
  82 {
  83         char *cp, *p, buf[BUFSIZ];
  84         int cc = 0;
  85         FILE *fd;
  86
  87         if ((fd = (FILE *)fopen(_PATH_NETCONF, "r")) == NULL) {
  88                                 /* make some assumptions */
  89                 service_order[0] = SERVICE_TABLE;
  90                 service_order[1] = SERVICE_NONE;
  91         } else {
  92                 while (fgets(buf, BUFSIZ, fd) != NULL && cc < SERVICE_MAX) {
  93                         if(buf[0] == '#')
  94                                 continue;
  95
  96                         p = buf;
  97                         while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
  98                                 ;
  99                         if (cp == NULL)
 100                                 continue;
 101                         do {
 102                                 if (isalpha((unsigned char)cp[0])) {
 103                                         service_order[cc] = get_service_name(cp);
 104                                         if(service_order[cc] != SERVICE_NONE)
 105                                                 cc++;
 106                                 }
 107                                 while ((cp = strsep(&p, "\n \t,:;")) != NULL && *cp == '\0')
 108                                         ;
 109                         } while(cp != NULL && cc < SERVICE_MAX);
 110                 }
 111                 service_order[cc] = SERVICE_NONE;
 112                 fclose(fd);
 113         }
 114         service_done = 1;
 115 }
 116
 117 struct netent *
 118 getnetbyname(const char *name)
 119 {
 120         struct netent *hp = 0;
 121         int nserv = 0;
 122
 123         if (!service_done)
 124                 init_services();
 125
 126         while (!hp) {
 127                 switch (service_order[nserv]) {
 128                       case SERVICE_NONE:
 129                         return NULL;
 130                       case SERVICE_TABLE:
 131                         hp = _getnetbyhtname(name);
 132                         break;
 133                       case SERVICE_BIND:
 134                         hp = _getnetbydnsname(name);
 135                         break;
 136                       case SERVICE_NIS:
 137                         hp = _getnetbynisname(name);
 138                         break;
 139                 }
 140                 nserv++;
 141         }
 142         return hp;
 143 }
 144
 145 struct netent *
 146 getnetbyaddr(addr, af)
 147         u_long addr;
 148         int af;
 149 {
 150         struct netent *hp = 0;
 151         int nserv = 0;
 152
 153         if (!service_done)
 154                 init_services();
 155
 156         while (!hp) {
 157                 switch (service_order[nserv]) {
 158                       case SERVICE_NONE:
 159                         return 0;
 160                       case SERVICE_TABLE:
 161                         hp = _getnetbyhtaddr(addr, af);
 162                         break;
 163                       case SERVICE_BIND:
 164                         hp = _getnetbydnsaddr(addr, af);
 165                         break;
 166                       case SERVICE_NIS:
 167                         hp = _getnetbynisaddr(addr, af);
 168                         break;
 169                 }
 170                 nserv++;
 171         }
 172         return hp;
 173 }
 174
 175 void
 176 setnetent(stayopen)
 177         int stayopen;
 178 {
 179         _setnethtent(stayopen);
 180         _setnetdnsent(stayopen);
 181 }
 182
 183 void
 184 endnetent()
 185 {
 186         _endnethtent();
 187         _endnetdnsent();
 188 }