1 | /********************************************************************\ |
---|
2 | * BitlBee -- An IRC to other IM-networks gateway * |
---|
3 | * * |
---|
4 | * Copyright 2002-2012 Wilmer van der Gaast and others * |
---|
5 | \********************************************************************/ |
---|
6 | |
---|
7 | /* Main file (Unix specific part) */ |
---|
8 | |
---|
9 | /* |
---|
10 | This program is free software; you can redistribute it and/or modify |
---|
11 | it under the terms of the GNU General Public License as published by |
---|
12 | the Free Software Foundation; either version 2 of the License, or |
---|
13 | (at your option) any later version. |
---|
14 | |
---|
15 | This program is distributed in the hope that it will be useful, |
---|
16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
18 | GNU General Public License for more details. |
---|
19 | |
---|
20 | You should have received a copy of the GNU General Public License with |
---|
21 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
---|
22 | if not, write to the Free Software Foundation, Inc., 51 Franklin St., |
---|
23 | Fifth Floor, Boston, MA 02110-1301 USA |
---|
24 | */ |
---|
25 | |
---|
26 | #include "bitlbee.h" |
---|
27 | |
---|
28 | #include "arc.h" |
---|
29 | #include "base64.h" |
---|
30 | #include "commands.h" |
---|
31 | #include "protocols/nogaim.h" |
---|
32 | #include "help.h" |
---|
33 | #include "ipc.h" |
---|
34 | #include "md5.h" |
---|
35 | #include "misc.h" |
---|
36 | #include <signal.h> |
---|
37 | #include <unistd.h> |
---|
38 | #include <sys/time.h> |
---|
39 | #include <sys/wait.h> |
---|
40 | #include <pwd.h> |
---|
41 | #include <locale.h> |
---|
42 | #include <grp.h> |
---|
43 | |
---|
44 | #if defined(OTR_BI) || defined(OTR_PI) |
---|
45 | #include "otr.h" |
---|
46 | #endif |
---|
47 | |
---|
48 | global_t global; /* Against global namespace pollution */ |
---|
49 | |
---|
50 | static struct { |
---|
51 | int fd[2]; |
---|
52 | int tag; |
---|
53 | } shutdown_pipe = {{-1 , -1}, 0}; |
---|
54 | |
---|
55 | static void sighandler_shutdown(int signal); |
---|
56 | static void sighandler_crash(int signal); |
---|
57 | |
---|
58 | static int crypt_main(int argc, char *argv[]); |
---|
59 | |
---|
60 | int main(int argc, char *argv[]) |
---|
61 | { |
---|
62 | int i = 0; |
---|
63 | char *old_cwd = NULL; |
---|
64 | struct sigaction sig, old; |
---|
65 | |
---|
66 | /* Required to make iconv to ASCII//TRANSLIT work. This makes BitlBee |
---|
67 | system-locale-sensitive. :-( */ |
---|
68 | setlocale(LC_CTYPE, ""); |
---|
69 | |
---|
70 | if (argc > 1 && strcmp(argv[1], "-x") == 0) { |
---|
71 | return crypt_main(argc, argv); |
---|
72 | } |
---|
73 | |
---|
74 | log_init(); |
---|
75 | |
---|
76 | global.conf_file = g_strdup(CONF_FILE_DEF); |
---|
77 | global.conf = conf_load(argc, argv); |
---|
78 | if (global.conf == NULL) { |
---|
79 | return(1); |
---|
80 | } |
---|
81 | |
---|
82 | if (global.conf->runmode == RUNMODE_INETD) { |
---|
83 | log_link(LOGLVL_ERROR, LOGOUTPUT_IRC); |
---|
84 | log_link(LOGLVL_WARNING, LOGOUTPUT_IRC); |
---|
85 | } else { |
---|
86 | log_link(LOGLVL_ERROR, LOGOUTPUT_CONSOLE); |
---|
87 | log_link(LOGLVL_WARNING, LOGOUTPUT_CONSOLE); |
---|
88 | } |
---|
89 | |
---|
90 | b_main_init(); |
---|
91 | |
---|
92 | /* libpurple doesn't like fork()s after initializing itself, so if |
---|
93 | we use it, do this init a little later (in case we're running in |
---|
94 | ForkDaemon mode). */ |
---|
95 | #ifndef WITH_PURPLE |
---|
96 | nogaim_init(); |
---|
97 | #endif |
---|
98 | |
---|
99 | #ifdef OTR_BI |
---|
100 | otr_init(); |
---|
101 | #endif |
---|
102 | |
---|
103 | global.helpfile = g_strdup(HELP_FILE); |
---|
104 | if (help_init(&global.help, global.helpfile) == NULL) { |
---|
105 | log_message(LOGLVL_WARNING, "Error opening helpfile %s.", HELP_FILE); |
---|
106 | } |
---|
107 | |
---|
108 | global.storage = storage_init(global.conf->primary_storage, global.conf->migrate_storage); |
---|
109 | if (global.storage == NULL) { |
---|
110 | log_message(LOGLVL_ERROR, "Unable to load storage backend '%s'", global.conf->primary_storage); |
---|
111 | return(1); |
---|
112 | } |
---|
113 | |
---|
114 | global.auth = auth_init(global.conf->auth_backend); |
---|
115 | if (global.conf->auth_backend && global.auth == NULL) { |
---|
116 | log_message(LOGLVL_ERROR, "Unable to load authentication backend '%s'", global.conf->auth_backend); |
---|
117 | return(1); |
---|
118 | } |
---|
119 | |
---|
120 | if (global.conf->runmode == RUNMODE_INETD) { |
---|
121 | i = bitlbee_inetd_init(); |
---|
122 | log_message(LOGLVL_INFO, "%s %s starting in inetd mode.", PACKAGE, BITLBEE_VERSION); |
---|
123 | |
---|
124 | } else if (global.conf->runmode == RUNMODE_DAEMON) { |
---|
125 | i = bitlbee_daemon_init(); |
---|
126 | log_message(LOGLVL_INFO, "%s %s starting in daemon mode.", PACKAGE, BITLBEE_VERSION); |
---|
127 | } else if (global.conf->runmode == RUNMODE_FORKDAEMON) { |
---|
128 | /* In case the operator requests a restart, we need this. */ |
---|
129 | old_cwd = g_malloc(256); |
---|
130 | if (getcwd(old_cwd, 255) == NULL) { |
---|
131 | log_message(LOGLVL_WARNING, "Could not save current directory: %s", strerror(errno)); |
---|
132 | g_free(old_cwd); |
---|
133 | old_cwd = NULL; |
---|
134 | } |
---|
135 | |
---|
136 | i = bitlbee_daemon_init(); |
---|
137 | log_message(LOGLVL_INFO, "%s %s starting in forking daemon mode.", PACKAGE, BITLBEE_VERSION); |
---|
138 | } |
---|
139 | if (i != 0) { |
---|
140 | return(i); |
---|
141 | } |
---|
142 | |
---|
143 | if ((global.conf->user && *global.conf->user) && |
---|
144 | (global.conf->runmode == RUNMODE_DAEMON || |
---|
145 | global.conf->runmode == RUNMODE_FORKDAEMON) && |
---|
146 | (!getuid() || !geteuid())) { |
---|
147 | struct passwd *pw = NULL; |
---|
148 | pw = getpwnam(global.conf->user); |
---|
149 | if (!pw) { |
---|
150 | log_message(LOGLVL_ERROR, "Failed to look up user %s.", global.conf->user); |
---|
151 | |
---|
152 | } else if (initgroups(global.conf->user, pw->pw_gid) != 0) { |
---|
153 | log_message(LOGLVL_ERROR, "initgroups: %s.", strerror(errno)); |
---|
154 | |
---|
155 | } else if (setgid(pw->pw_gid) != 0) { |
---|
156 | log_message(LOGLVL_ERROR, "setgid(%d): %s.", pw->pw_gid, strerror(errno)); |
---|
157 | |
---|
158 | } else if (setuid(pw->pw_uid) != 0) { |
---|
159 | log_message(LOGLVL_ERROR, "setuid(%d): %s.", pw->pw_uid, strerror(errno)); |
---|
160 | } |
---|
161 | } |
---|
162 | |
---|
163 | /* Catch some signals to tell the user what's happening before quitting */ |
---|
164 | memset(&sig, 0, sizeof(sig)); |
---|
165 | sig.sa_handler = SIG_IGN; |
---|
166 | sigaction(SIGCHLD, &sig, &old); |
---|
167 | sigaction(SIGPIPE, &sig, &old); |
---|
168 | sig.sa_flags = SA_RESETHAND; |
---|
169 | sig.sa_handler = sighandler_crash; |
---|
170 | sigaction(SIGSEGV, &sig, &old); |
---|
171 | |
---|
172 | sighandler_shutdown_setup(); |
---|
173 | |
---|
174 | sig.sa_handler = sighandler_shutdown; |
---|
175 | sigaction(SIGINT, &sig, &old); |
---|
176 | sigaction(SIGTERM, &sig, &old); |
---|
177 | |
---|
178 | if (!getuid() || !geteuid()) { |
---|
179 | log_message(LOGLVL_WARNING, "BitlBee is running with root privileges. Why?"); |
---|
180 | } |
---|
181 | |
---|
182 | b_main_run(); |
---|
183 | |
---|
184 | /* Mainly good for restarting, to make sure we close the help.txt fd. */ |
---|
185 | help_free(&global.help); |
---|
186 | |
---|
187 | if (global.restart) { |
---|
188 | char *fn = ipc_master_save_state(); |
---|
189 | char *env; |
---|
190 | |
---|
191 | env = g_strdup_printf("_BITLBEE_RESTART_STATE=%s", fn); |
---|
192 | putenv(env); |
---|
193 | g_free(fn); |
---|
194 | /* Looks like env should *not* be freed here as putenv |
---|
195 | doesn't make a copy. Odd. */ |
---|
196 | |
---|
197 | i = chdir(old_cwd); |
---|
198 | close(global.listen_socket); |
---|
199 | |
---|
200 | if (execv(argv[0], argv) == -1) { |
---|
201 | /* Apparently the execve() failed, so let's just |
---|
202 | jump back into our own/current main(). */ |
---|
203 | /* Need more cleanup code to make this work. */ |
---|
204 | return 1; /* main( argc, argv ); */ |
---|
205 | } |
---|
206 | } |
---|
207 | |
---|
208 | return(0); |
---|
209 | } |
---|
210 | |
---|
211 | static int crypt_main(int argc, char *argv[]) |
---|
212 | { |
---|
213 | int pass_len; |
---|
214 | unsigned char *pass_cr, *pass_cl; |
---|
215 | |
---|
216 | if (argc < 4 || (strcmp(argv[2], "hash") != 0 && |
---|
217 | strcmp(argv[2], "unhash") != 0 && argc < 5)) { |
---|
218 | printf("Supported:\n" |
---|
219 | " %s -x enc <key> <cleartext password>\n" |
---|
220 | " %s -x dec <key> <encrypted password>\n" |
---|
221 | " %s -x hash <cleartext password>\n" |
---|
222 | " %s -x unhash <hashed password>\n" |
---|
223 | " %s -x chkhash <hashed password> <cleartext password>\n", |
---|
224 | argv[0], argv[0], argv[0], argv[0], argv[0]); |
---|
225 | } else if (strcmp(argv[2], "enc") == 0) { |
---|
226 | char *encoded; |
---|
227 | |
---|
228 | pass_len = arc_encode(argv[4], strlen(argv[4]), &pass_cr, argv[3], 12); |
---|
229 | |
---|
230 | encoded = base64_encode(pass_cr, pass_len); |
---|
231 | printf("%s\n", encoded); |
---|
232 | g_free(encoded); |
---|
233 | g_free(pass_cr); |
---|
234 | } else if (strcmp(argv[2], "dec") == 0) { |
---|
235 | pass_len = base64_decode(argv[4], &pass_cr); |
---|
236 | arc_decode(pass_cr, pass_len, (char **) &pass_cl, argv[3]); |
---|
237 | printf("%s\n", pass_cl); |
---|
238 | |
---|
239 | g_free(pass_cr); |
---|
240 | g_free(pass_cl); |
---|
241 | } else if (strcmp(argv[2], "hash") == 0) { |
---|
242 | md5_byte_t pass_md5[21]; |
---|
243 | md5_state_t md5_state; |
---|
244 | char *encoded; |
---|
245 | |
---|
246 | random_bytes(pass_md5 + 16, 5); |
---|
247 | md5_init(&md5_state); |
---|
248 | md5_append(&md5_state, (md5_byte_t *) argv[3], strlen(argv[3])); |
---|
249 | md5_append(&md5_state, pass_md5 + 16, 5); /* Add the salt. */ |
---|
250 | md5_finish(&md5_state, pass_md5); |
---|
251 | |
---|
252 | encoded = base64_encode(pass_md5, 21); |
---|
253 | printf("%s\n", encoded); |
---|
254 | g_free(encoded); |
---|
255 | } else if (strcmp(argv[2], "unhash") == 0) { |
---|
256 | printf("Hash %s submitted to a massive Beowulf cluster of\n" |
---|
257 | "overclocked 486s. Expect your answer next year somewhere around this time. :-)\n", argv[3]); |
---|
258 | } else if (strcmp(argv[2], "chkhash") == 0) { |
---|
259 | char *hash = strncmp(argv[3], "md5:", 4) == 0 ? argv[3] + 4 : argv[3]; |
---|
260 | int st = md5_verify_password(argv[4], hash); |
---|
261 | |
---|
262 | printf("Hash %s given password.\n", st == 0 ? "matches" : "does not match"); |
---|
263 | |
---|
264 | return st; |
---|
265 | } |
---|
266 | |
---|
267 | return 0; |
---|
268 | } |
---|
269 | |
---|
270 | /* Set up a pipe for SIGTERM/SIGINT so the actual signal handler doesn't do anything unsafe */ |
---|
271 | void sighandler_shutdown_setup() |
---|
272 | { |
---|
273 | if (shutdown_pipe.fd[0] != -1) { |
---|
274 | /* called again from a forked process, clean up to avoid propagating the signal */ |
---|
275 | b_event_remove(shutdown_pipe.tag); |
---|
276 | close(shutdown_pipe.fd[0]); |
---|
277 | close(shutdown_pipe.fd[1]); |
---|
278 | } |
---|
279 | |
---|
280 | if (pipe(shutdown_pipe.fd) == 0) { |
---|
281 | shutdown_pipe.tag = b_input_add(shutdown_pipe.fd[0], B_EV_IO_READ, bitlbee_shutdown, NULL); |
---|
282 | } |
---|
283 | } |
---|
284 | |
---|
285 | /* Signal handler for SIGTERM and SIGINT */ |
---|
286 | static void sighandler_shutdown(int signal) |
---|
287 | { |
---|
288 | int unused G_GNUC_UNUSED; |
---|
289 | /* Write a single null byte to the pipe, just to send a message to the main loop. |
---|
290 | * This gets handled by bitlbee_shutdown (the b_input_add callback for this pipe) */ |
---|
291 | unused = write(shutdown_pipe.fd[1], "", 1); |
---|
292 | } |
---|
293 | |
---|
294 | /* Signal handler for SIGSEGV |
---|
295 | * A desperate attempt to tell the user that everything is wrong in the world. |
---|
296 | * Avoids using irc_abort() because it has several unsafe calls to malloc */ |
---|
297 | static void sighandler_crash(int signal) |
---|
298 | { |
---|
299 | GSList *l; |
---|
300 | int unused G_GNUC_UNUSED; |
---|
301 | const char *message = "ERROR :BitlBee crashed! (SIGSEGV received)\r\n"; |
---|
302 | int len = strlen(message); |
---|
303 | |
---|
304 | for (l = irc_connection_list; l; l = l->next) { |
---|
305 | irc_t *irc = l->data; |
---|
306 | sock_make_blocking(irc->fd); |
---|
307 | unused = write(irc->fd, message, len); |
---|
308 | } |
---|
309 | |
---|
310 | raise(signal); |
---|
311 | } |
---|
312 | |
---|
313 | double gettime() |
---|
314 | { |
---|
315 | struct timeval time[1]; |
---|
316 | |
---|
317 | gettimeofday(time, 0); |
---|
318 | return((double) time->tv_sec + (double) time->tv_usec / 1000000); |
---|
319 | } |
---|