2 * This file is part of DisOrder
3 * Copyright (C) 2007 Richard Kettlewell
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.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
33 #include "configuration.h"
40 static const struct option options[] = {
41 { "help", no_argument, 0, 'h' },
42 { "version", no_argument, 0, 'V' },
43 { "output", required_argument, 0, 'o' },
47 /* display usage message and terminate */
48 static void help(void) {
50 " disorder-udplog [OPTIONS] ADDRESS PORT\n"
52 " --output, -o PATH Output to PATH (default: stdout)\n"
53 " --help, -h Display usage message\n"
54 " --version, -V Display version number\n"
56 "UDP packet receiver.\n");
61 /* display version number and terminate */
62 static void version(void) {
63 xprintf("%s", disorder_version_string);
68 int main(int argc, char **argv) {
72 char *name, h[4096], s[4096];
76 struct sockaddr_in sin;
77 struct sockaddr_in6 sin6;
82 static const struct addrinfo pref = {
84 .ai_family = AF_UNSPEC,
85 .ai_socktype = SOCK_DGRAM,
86 .ai_protocol = IPPROTO_UDP,
91 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
92 while((n = getopt_long(argc, argv, "hVo:", options, 0)) >= 0) {
97 if(!freopen(optarg, "w", stdout))
98 fatal(errno, "%s", optarg);
100 default: fatal(0, "invalid option");
103 if(optind + 2 != argc)
104 fatal(0, "missing arguments");
107 if(!(ai = get_address(&a, &pref, &name)))
109 fd = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
111 if(bind(fd, ai->ai_addr, ai->ai_addrlen) < 0)
112 fatal(errno, "error binding to %s", name);
113 while(getppid() != 1) {
114 /* Wait for something to happen. We don't just block forever in recvfrom()
115 * as otherwise we'd never die if the parent terminated uncontrolledly. */
120 select(fd + 1, &fds, 0, 0, &tv);
122 n = recvfrom(fd, buffer, sizeof buffer, 0, &sa.sa, &len);
124 if(errno == EINTR || errno == EAGAIN)
126 fatal(errno, "%s: recvfrom", name);
128 if((err = getnameinfo(&sa.sa, len, h, sizeof h, s, sizeof s,
129 NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM)))
130 fatal(0, "getnameinfo: %s", gai_strerror(err));
131 xprintf("from host %s service %s: %d bytes\n", h, s, n);
132 for(i = 0; i < n; i += 16) {
133 for(j = i; j < n && j < i + 16; ++j)
134 xprintf(" %02x", buffer[j]);
135 for(; j < i + 16; ++j)
138 for(j = i; j < n && j < i + 16; ++j)
139 xprintf("%c", buffer[j] < 128 && isprint(buffer[j]) ? buffer[j] : '.');
141 if(fflush(stdout) < 0)
142 fatal(errno, "stdout");