chiark / gitweb /
register/confirm commands, and tests, and docs
[disorder] / tests / udplog.c
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1/*
2 * This file is part of DisOrder
3 * Copyright (C) 2007 Richard Kettlewell
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; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#include <config.h>
22#include "types.h"
23
24#include <getopt.h>
25#include <sys/types.h>
26#include <sys/socket.h>
27#include <netinet/in.h>
28#include <errno.h>
29#include <locale.h>
30#include <netdb.h>
31#include <unistd.h>
32#include <ctype.h>
33
34#include "configuration.h"
35#include "syscalls.h"
36#include "log.h"
37#include "addr.h"
38#include "defs.h"
39#include "mem.h"
40
41static const struct option options[] = {
42 { "help", no_argument, 0, 'h' },
43 { "version", no_argument, 0, 'V' },
44 { "output", required_argument, 0, 'o' },
45 { 0, 0, 0, 0 }
46};
47
48/* display usage message and terminate */
49static void help(void) {
50 xprintf("Usage:\n"
51 " disorder-udplog [OPTIONS] ADDRESS PORT\n"
52 "Options:\n"
53 " --output, -o PATH Output to PATH (default: stdout)\n"
54 " --help, -h Display usage message\n"
55 " --version, -V Display version number\n"
56 "\n"
57 "UDP packet receiver.\n");
58 xfclose(stdout);
59 exit(0);
60}
61
62/* display version number and terminate */
63static void version(void) {
a05e4467 64 xprintf("%s", disorder_version_string);
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65 xfclose(stdout);
66 exit(0);
67}
68
69int main(int argc, char **argv) {
70 int n, fd, err, i, j;
71 struct addrinfo *ai;
72 struct stringlist a;
73 char *name, h[4096], s[4096];
74 uint8_t buffer[4096];
75 union {
76 struct sockaddr sa;
77 struct sockaddr_in sin;
78 struct sockaddr_in6 sin6;
79 } sa;
80 socklen_t len;
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81 fd_set fds;
82 struct timeval tv;
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83 static const struct addrinfo pref = {
84 0, /* ai_flags */
85 AF_UNSPEC, /* ai_family */
86 SOCK_DGRAM, /* ai_socktype */
87 IPPROTO_UDP, /* ai_protocol */
88 0,
89 0,
90 0,
91 0
92 };
93
94 set_progname(argv);
95 mem_init();
96 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
97 while((n = getopt_long(argc, argv, "hVo:", options, 0)) >= 0) {
98 switch(n) {
99 case 'h': help();
100 case 'V': version();
101 case 'o':
102 if(!freopen(optarg, "w", stdout))
103 fatal(errno, "%s", optarg);
104 break;
105 default: fatal(0, "invalid option");
106 }
107 }
108 if(optind + 2 != argc)
109 fatal(0, "missing arguments");
110 a.n = 2;
111 a.s = &argv[optind];
112 if(!(ai = get_address(&a, &pref, &name)))
113 exit(1);
114 fd = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
95ceb9ea 115 nonblock(fd);
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116 if(bind(fd, ai->ai_addr, ai->ai_addrlen) < 0)
117 fatal(errno, "error binding to %s", name);
118 while(getppid() != 1) {
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119 /* Wait for something to happen. We don't just block forever in recvfrom()
120 * as otherwise we'd never die if the parent terminated uncontrolledly. */
121 FD_ZERO(&fds);
122 FD_SET(fd, &fds);
123 tv.tv_sec = 1;
124 tv.tv_usec = 0;
125 select(fd + 1, &fds, 0, 0, &tv);
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126 len = sizeof sa;
127 n = recvfrom(fd, buffer, sizeof buffer, 0, &sa.sa, &len);
128 if(n < 0) {
129 if(errno == EINTR || errno == EAGAIN)
130 continue;
131 fatal(errno, "%s: recvfrom", name);
132 }
133 if((err = getnameinfo(&sa.sa, len, h, sizeof h, s, sizeof s,
134 NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM)))
135 fatal(0, "getnameinfo: %s", gai_strerror(err));
136 xprintf("from host %s service %s: %d bytes\n", h, s, n);
137 for(i = 0; i < n; i += 16) {
138 for(j = i; j < n && j < i + 16; ++j)
139 xprintf(" %02x", buffer[j]);
140 for(; j < i + 16; ++j)
141 xprintf(" ");
142 xprintf(" ");
143 for(j = i; j < n && j < i + 16; ++j)
144 xprintf("%c", buffer[j] < 128 && isprint(buffer[j]) ? buffer[j] : '.');
145 xprintf("\n");
146 if(fflush(stdout) < 0)
147 fatal(errno, "stdout");
148 }
149 }
150 return 0;
151}
152
153/*
154Local Variables:
155c-basic-offset:2
156comment-column:40
157fill-column:79
158indent-tabs-mode:nil
159End:
160*/