src/recv-announce.cc

   1
   2
   3 /*
   4  * $Id: recv-announce.cc,v 1.17 1998/02/03 04:21:20 wessels Exp $
   5  *
   6  * DEBUG: section 0     Announcement Server
   7  * AUTHOR: Harvest Derived
   8  *
   9  * SQUID Internet Object Cache  http://squid.nlanr.net/Squid/
  10  * --------------------------------------------------------
  11  *
  12  *  Squid is the result of efforts by numerous individuals from the
  13  *  Internet community.  Development is led by Duane Wessels of the
  14  *  National Laboratory for Applied Network Research and funded by
  15  *  the National Science Foundation.
  16  *
  17  *  This program is free software; you can redistribute it and/or modify
  18  *  it under the terms of the GNU General Public License as published by
  19  *  the Free Software Foundation; either version 2 of the License, or
  20  *  (at your option) any later version.
  21  *
  22  *  This program is distributed in the hope that it will be useful,
  23  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  *  GNU General Public License for more details.
  26  *
  27  *  You should have received a copy of the GNU General Public License
  28  *  along with this program; if not, write to the Free Software
  29  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  30  *
  31  */
  32
  33 /*
  34  * Copyright (c) 1994, 1995.  All rights reserved.
  35  *
  36  *   The Harvest software was developed by the Internet Research Task
  37  *   Force Research Group on Resource Discovery (IRTF-RD):
  38  *
  39  *         Mic Bowman of Transarc Corporation.
  40  *         Peter Danzig of the University of Southern California.
  41  *         Darren R. Hardy of the University of Colorado at Boulder.
  42  *         Udi Manber of the University of Arizona.
  43  *         Michael F. Schwartz of the University of Colorado at Boulder.
  44  *         Duane Wessels of the University of Colorado at Boulder.
  45  *
  46  *   This copyright notice applies to software in the Harvest
  47  *   ``src/'' directory only.  Users should consult the individual
  48  *   copyright notices in the ``components/'' subdirectories for
  49  *   copyright information about other software bundled with the
  50  *   Harvest source code distribution.
  51  *
  52  * TERMS OF USE
  53  *
  54  *   The Harvest software may be used and re-distributed without
  55  *   charge, provided that the software origin and research team are
  56  *   cited in any use of the system.  Most commonly this is
  57  *   accomplished by including a link to the Harvest Home Page
  58  *   (http://harvest.cs.colorado.edu/) from the query page of any
  59  *   Broker you deploy, as well as in the query result pages.  These
  60  *   links are generated automatically by the standard Broker
  61  *   software distribution.
  62  *
  63  *   The Harvest software is provided ``as is'', without express or
  64  *   implied warranty, and with no support nor obligation to assist
  65  *   in its use, correction, modification or enhancement.  We assume
  66  *   no liability with respect to the infringement of copyrights,
  67  *   trade secrets, or any patents, and are not responsible for
  68  *   consequential damages.  Proper use of the Harvest software is
  69  *   entirely the responsibility of the user.
  70  *
  71  * DERIVATIVE WORKS
  72  *
  73  *   Users may make derivative works from the Harvest software, subject
  74  *   to the following constraints:
  75  *
  76  *     - You must include the above copyright notice and these
  77  *       accompanying paragraphs in all forms of derivative works,
  78  *       and any documentation and other materials related to such
  79  *       distribution and use acknowledge that the software was
  80  *       developed at the above institutions.
  81  *
  82  *     - You must notify IRTF-RD regarding your distribution of
  83  *       the derivative work.
  84  *
  85  *     - You must clearly notify users that your are distributing
  86  *       a modified version and not the original Harvest software.
  87  *
  88  *     - Any derivative product is also subject to these copyright
  89  *       and use restrictions.
  90  *
  91  *   Note that the Harvest software is NOT in the public domain.  We
  92  *   retain copyright, as specified above.
  93  *
  94  * HISTORY OF FREE SOFTWARE STATUS
  95  *
  96  *   Originally we required sites to license the software in cases
  97  *   where they were going to build commercial products/services
  98  *   around Harvest.  In June 1995 we changed this policy.  We now
  99  *   allow people to use the core Harvest software (the code found in
 100  *   the Harvest ``src/'' directory) for free.  We made this change
 101  *   in the interest of encouraging the widest possible deployment of
 102  *   the technology.  The Harvest software is really a reference
 103  *   implementation of a set of protocols and formats, some of which
 104  *   we intend to standardize.  We encourage commercial
 105  *   re-implementations of code complying to this set of standards.
 106  */
 107
 108 #include <stdio.h>
 109 #include <fcntl.h>
 110 #include <stdlib.h>
 111 #include <string.h>
 112 #include <sys/types.h>
 113 #include <sys/socket.h>
 114 #include <netinet/in.h>
 115 #include <arpa/inet.h>
 116 #include <netdb.h>
 117 #include <unistd.h>
 118 #include <signal.h>
 119
 120 #define RECV_BUF_SIZE 8192
 121
 122 extern void xmemcpy(void *from, void *to, int len);
 123
 124 /*
 125  * This program must be run from inetd.  First add something like this
 126  * to /etc/services:
 127  *
 128  * cached_announce 3131/udp             # cache announcements
 129  *
 130  * And then add something like this to /etc/inetd/conf:
 131  *
 132  * cached_announce dgram udp       wait cached /tmp/recv-announce recv-announce /tmp/recv-announce.log
 133  *
 134  *
 135  * A single instance of this process will continue to handle incoming
 136  * requests.  If it dies, or is killed, inetd should restart it when the
 137  * next message arrives.
 138  *
 139  */
 140
 141 /*
 142  * usage: recv-announce logfile
 143  */
 144
 145 static void
 146 sig_handle(void)
 147 {
 148     fflush(stdout);
 149     close(2);
 150     close(1);
 151     close(0);
 152     exit(0);
 153 }
 154
 155
 156 int
 157 main(int argc, char *argv[])
 158 {
 159     char buf[RECV_BUF_SIZE];
 160     struct sockaddr_in R;
 161     int len;
 162     struct hostent *hp = NULL;
 163     char logfile[BUFSIZ];
 164     char ip[4];
 165
 166     for (len = 0; len < 32; len++) {
 167         signal(len, sig_handle);
 168     }
 169
 170
 171     if (argc > 1)
 172         strcpy(logfile, argv[1]);
 173     else
 174         strcpy(logfile, "/tmp/recv-announce.log");
 175
 176     close(1);
 177     if (open(logfile, O_WRONLY | O_CREAT | O_APPEND, 0660) < 0) {
 178         perror(logfile);
 179         exit(1);
 180     }
 181     close(2);
 182     dup(1);
 183
 184
 185     for(;;) {
 186         memset(buf, '\0', RECV_BUF_SIZE);
 187         memset(&R, '\0', len = sizeof(R));
 188
 189         if (recvfrom(0, buf, RECV_BUF_SIZE, 0, &R, &len) < 0) {
 190             perror("recv");
 191             exit(2);
 192         }
 193         xmemcpy(ip, &R.sin_addr.s_addr, 4);
 194         hp = gethostbyaddr(ip, 4, AF_INET);
 195         printf("==============================================================================\n");
 196         printf("Received from %s [%s]\n",
 197             inet_ntoa(R.sin_addr),
 198             (hp && hp->h_name) ? hp->h_name : "Unknown");
 199         fputs(buf, stdout);
 200         fflush(stdout);
 201     }
 202     return 0;
 203 }