src/recv-announce.cc

   1
   2 /*
   3  * $Id: recv-announce.cc,v 1.22 2000/06/06 19:34:31 hno Exp $
   4  *
   5  * DEBUG: section 0     Announcement Server
   6  * AUTHOR: Harvest Derived
   7  *
   8  * SQUID Internet Object Cache  http://squid.nlanr.net/Squid/
   9  * ----------------------------------------------------------
  10  *
  11  *  Squid is the result of efforts by numerous individuals from the
  12  *  Internet community.  Development is led by Duane Wessels of the
  13  *  National Laboratory for Applied Network Research and funded by the
  14  *  National Science Foundation.  Squid is Copyrighted (C) 1998 by
  15  *  the Regents of the University of California.  Please see the
  16  *  COPYRIGHT file for full details.  Squid incorporates software
  17  *  developed and/or copyrighted by other sources.  Please see the
  18  *  CREDITS file for full details.
  19  *
  20  *  This program is free software; you can redistribute it and/or modify
  21  *  it under the terms of the GNU General Public License as published by
  22  *  the Free Software Foundation; either version 2 of the License, or
  23  *  (at your option) any later version.
  24  *
  25  *  This program is distributed in the hope that it will be useful,
  26  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  *  GNU General Public License for more details.
  29  *
  30  *  You should have received a copy of the GNU General Public License
  31  *  along with this program; if not, write to the Free Software
  32  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
  33  *
  34  */
  35
  36 #include <stdio.h>
  37 #include <fcntl.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <sys/types.h>
  41 #include <sys/socket.h>
  42 #include <netinet/in.h>
  43 #include <arpa/inet.h>
  44 #include <netdb.h>
  45 #include <unistd.h>
  46 #include <signal.h>
  47
  48 #define RECV_BUF_SIZE 8192
  49
  50 extern void xmemcpy(void *from, void *to, int len);
  51
  52 /*
  53  * This program must be run from inetd.  First add something like this
  54  * to /etc/services:
  55  *
  56  * cached_announce 3131/udp             # cache announcements
  57  *
  58  * And then add something like this to /etc/inetd/conf:
  59  *
  60  * cached_announce dgram udp       wait cached /tmp/recv-announce recv-announce /tmp/recv-announce.log
  61  *
  62  *
  63  * A single instance of this process will continue to handle incoming
  64  * requests.  If it dies, or is killed, inetd should restart it when the
  65  * next message arrives.
  66  *
  67  */
  68
  69 /*
  70  * usage: recv-announce logfile
  71  */
  72
  73 static void
  74 sig_handle(void)
  75 {
  76     fflush(stdout);
  77     close(2);
  78     close(1);
  79     close(0);
  80     exit(0);
  81 }
  82
  83
  84 int
  85 main(int argc, char *argv[])
  86 {
  87     char buf[RECV_BUF_SIZE];
  88     struct sockaddr_in R;
  89     int len;
  90     struct hostent *hp = NULL;
  91     char logfile[BUFSIZ];
  92     char ip[4];
  93
  94     for (len = 0; len < 32; len++) {
  95         signal(len, sig_handle);
  96     }
  97
  98
  99     if (argc > 1)
 100         strcpy(logfile, argv[1]);
 101     else
 102         strcpy(logfile, "/tmp/recv-announce.log");
 103
 104     close(1);
 105     if (open(logfile, O_WRONLY | O_CREAT | O_APPEND, 0660) < 0) {
 106         perror(logfile);
 107         exit(1);
 108     }
 109     close(2);
 110     dup(1);
 111
 112
 113     for (;;) {
 114         memset(buf, '\0', RECV_BUF_SIZE);
 115         memset(&R, '\0', len = sizeof(R));
 116
 117         if (recvfrom(0, buf, RECV_BUF_SIZE, 0, &R, &len) < 0) {
 118             perror("recv");
 119             exit(2);
 120         }
 121         xmemcpy(ip, &R.sin_addr.s_addr, 4);
 122         hp = gethostbyaddr(ip, 4, AF_INET);
 123         printf("==============================================================================\n");
 124         printf("Received from %s [%s]\n",
 125             inet_ntoa(R.sin_addr),
 126             (hp && hp->h_name) ? hp->h_name : "Unknown");
 127         fputs(buf, stdout);
 128         fflush(stdout);
 129     }
 130     return 0;
 131 }