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quagga 1.0.20160315

    1: /*
    2:   PIM for Quagga
    3:   Copyright (C) 2008  Everton da Silva Marques
    4: 
    5:   This program is free software; you can redistribute it and/or modify
    6:   it under the terms of the GNU General Public License as published by
    7:   the Free Software Foundation; either version 2 of the License, or
    8:   (at your option) any later version.
    9: 
   10:   This program is distributed in the hope that it will be useful, but
   11:   WITHOUT ANY WARRANTY; without even the implied warranty of
   12:   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   13:   General Public License for more details.
   14:   
   15:   You should have received a copy of the GNU General Public License
   16:   along with this program; see the file COPYING; if not, write to the
   17:   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
   18:   MA 02110-1301 USA
   19:   
   20:   $QuaggaId: $Format:%an, %ai, %h$ $
   21: */
   22: 
   23: #include <stdlib.h>
   24: #include <stdio.h>
   25: #include <errno.h>
   26: #include <string.h>
   27: #include <unistd.h>
   28: #include <sys/types.h>
   29: #include <sys/socket.h>
   30: #include <net/if.h>
   31: #include <arpa/inet.h>
   32: 
   33: #include "pim_igmp_join.h"
   34: 
   35: const char *prog_name = 0;
   36: 
   37: static int iface_solve_index(const char *ifname)
   38: {
   39:   struct if_nameindex *ini;
   40:   ifindex_t ifindex = -1;
   41:   int i;
   42: 
   43:   if (!ifname)
   44:     return -1;
   45: 
   46:   ini = if_nameindex();
   47:   if (!ini) {
   48:     int err = errno;
   49:     fprintf(stderr,
   50: 	    "%s: interface=%s: failure solving index: errno=%d: %s\n",
   51: 	    prog_name, ifname, err, strerror(err));
   52:     errno = err;
   53:     return -1;
   54:   }
   55: 
   56:   for (i = 0; ini[i].if_index; ++i) {
   57: #if 0
   58:     fprintf(stderr,
   59: 	    "%s: interface=%s matching against local ifname=%s ifindex=%d\n",
   60: 	    prog_name, ifname, ini[i].if_name, ini[i].if_index);
   61: #endif
   62:     if (!strcmp(ini[i].if_name, ifname)) {
   63:       ifindex = ini[i].if_index;
   64:       break;
   65:     }
   66:   }
   67: 
   68:   if_freenameindex(ini);
   69: 
   70:   return ifindex;
   71: }
   72: 
   73: int main(int argc, const char *argv[])
   74: {
   75:   struct in_addr group_addr;
   76:   struct in_addr source_addr;
   77:   const char *ifname;
   78:   const char *group;
   79:   const char *source;
   80:   ifindex_t ifindex;
   81:   int result;
   82:   int fd;
   83: 
   84:   prog_name = argv[0];
   85: 
   86:   fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
   87:   if (fd < 0) {
   88:     fprintf(stderr,
   89: 	    "%s: could not create socket: socket(): errno=%d: %s\n",
   90: 	    prog_name, errno, strerror(errno));
   91:     exit(1);
   92:   }
   93: 
   94:   if (argc != 4) {
   95:     fprintf(stderr,
   96: 	    "usage:   %s interface group     source\n"
   97: 	    "example: %s eth0      232.1.1.1 1.1.1.1\n",
   98: 	    prog_name, prog_name);
   99:     exit(1);
  100:   }
  101: 
  102:   ifname = argv[1];
  103:   group  = argv[2];
  104:   source = argv[3];
  105: 
  106:   ifindex = iface_solve_index(ifname);
  107:   if (ifindex < 0) {
  108:     fprintf(stderr, "%s: could not find interface: %s\n",
  109: 	    prog_name, ifname);
  110:     exit(1);
  111:   }
  112: 
  113:   result = inet_pton(AF_INET, group, &group_addr);
  114:   if (result <= 0) {
  115:     fprintf(stderr, "%s: bad group address: %s\n",
  116: 	    prog_name, group);
  117:     exit(1);
  118:   }
  119: 
  120:   result = inet_pton(AF_INET, source, &source_addr);
  121:   if (result <= 0) {
  122:     fprintf(stderr, "%s: bad source address: %s\n",
  123: 	    prog_name, source);
  124:     exit(1);
  125:   }
  126: 
  127:   result = pim_igmp_join_source(fd, ifindex, group_addr, source_addr);
  128:   if (result) {
  129:     fprintf(stderr,
  130: 	    "%s: setsockopt(fd=%d) failure for IGMP group %s source %s ifindex %d on interface %s: errno=%d: %s\n",
  131: 	    prog_name, fd, group, source, ifindex, ifname,
  132: 	    errno, strerror(errno));
  133:     exit(1);
  134:   }
  135: 
  136:   printf("%s: joined channel (S,G)=(%s,%s) on interface %s\n",
  137: 	 prog_name, source, group, ifname);
  138: 
  139:   printf("%s: waiting...\n", prog_name);
  140: 
  141:   getchar();
  142: 
  143:   close(fd);
  144: 
  145:   printf("%s: left channel (S,G)=(%s,%s) on interface %s\n",
  146: 	 prog_name, source, group, ifname);
  147: 
  148:   exit(0);
  149: }