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6ce6b5a9 RK |
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 | ||
41 | static 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 */ | |
49 | static 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 */ | |
63 | static void version(void) { | |
a05e4467 | 64 | xprintf("%s", disorder_version_string); |
6ce6b5a9 RK |
65 | xfclose(stdout); |
66 | exit(0); | |
67 | } | |
68 | ||
69 | int 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; | |
95ceb9ea RK |
81 | fd_set fds; |
82 | struct timeval tv; | |
6ce6b5a9 | 83 | static const struct addrinfo pref = { |
66613034 RK |
84 | .ai_flags = 0, |
85 | .ai_family = AF_UNSPEC, | |
86 | .ai_socktype = SOCK_DGRAM, | |
87 | .ai_protocol = IPPROTO_UDP, | |
6ce6b5a9 RK |
88 | }; |
89 | ||
90 | set_progname(argv); | |
91 | mem_init(); | |
92 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); | |
93 | while((n = getopt_long(argc, argv, "hVo:", options, 0)) >= 0) { | |
94 | switch(n) { | |
95 | case 'h': help(); | |
96 | case 'V': version(); | |
97 | case 'o': | |
98 | if(!freopen(optarg, "w", stdout)) | |
99 | fatal(errno, "%s", optarg); | |
100 | break; | |
101 | default: fatal(0, "invalid option"); | |
102 | } | |
103 | } | |
104 | if(optind + 2 != argc) | |
105 | fatal(0, "missing arguments"); | |
106 | a.n = 2; | |
107 | a.s = &argv[optind]; | |
108 | if(!(ai = get_address(&a, &pref, &name))) | |
109 | exit(1); | |
110 | fd = xsocket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); | |
95ceb9ea | 111 | nonblock(fd); |
6ce6b5a9 RK |
112 | if(bind(fd, ai->ai_addr, ai->ai_addrlen) < 0) |
113 | fatal(errno, "error binding to %s", name); | |
114 | while(getppid() != 1) { | |
95ceb9ea RK |
115 | /* Wait for something to happen. We don't just block forever in recvfrom() |
116 | * as otherwise we'd never die if the parent terminated uncontrolledly. */ | |
117 | FD_ZERO(&fds); | |
118 | FD_SET(fd, &fds); | |
119 | tv.tv_sec = 1; | |
120 | tv.tv_usec = 0; | |
121 | select(fd + 1, &fds, 0, 0, &tv); | |
6ce6b5a9 RK |
122 | len = sizeof sa; |
123 | n = recvfrom(fd, buffer, sizeof buffer, 0, &sa.sa, &len); | |
124 | if(n < 0) { | |
125 | if(errno == EINTR || errno == EAGAIN) | |
126 | continue; | |
127 | fatal(errno, "%s: recvfrom", name); | |
128 | } | |
129 | if((err = getnameinfo(&sa.sa, len, h, sizeof h, s, sizeof s, | |
130 | NI_NUMERICHOST|NI_NUMERICSERV|NI_DGRAM))) | |
131 | fatal(0, "getnameinfo: %s", gai_strerror(err)); | |
132 | xprintf("from host %s service %s: %d bytes\n", h, s, n); | |
133 | for(i = 0; i < n; i += 16) { | |
134 | for(j = i; j < n && j < i + 16; ++j) | |
135 | xprintf(" %02x", buffer[j]); | |
136 | for(; j < i + 16; ++j) | |
137 | xprintf(" "); | |
138 | xprintf(" "); | |
139 | for(j = i; j < n && j < i + 16; ++j) | |
140 | xprintf("%c", buffer[j] < 128 && isprint(buffer[j]) ? buffer[j] : '.'); | |
141 | xprintf("\n"); | |
142 | if(fflush(stdout) < 0) | |
143 | fatal(errno, "stdout"); | |
144 | } | |
145 | } | |
146 | return 0; | |
147 | } | |
148 | ||
149 | /* | |
150 | Local Variables: | |
151 | c-basic-offset:2 | |
152 | comment-column:40 | |
153 | fill-column:79 | |
154 | indent-tabs-mode:nil | |
155 | End: | |
156 | */ |