2 * This file is part of secnet.
3 * See README for full list of copyright holders.
5 * secnet is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 3 of the License, or
8 * (at your option) any later version.
10 * secnet 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 * version 3 along with secnet; if not, see
17 * https://www.gnu.org/licenses/gpl.html.
28 #include <sys/socket.h>
29 #include <arpa/inet.h>
38 /* apple's poll() does not work on char devs */
42 /* XXX should be from autoconf */
43 static const char *configfile="/etc/secnet/secnet.conf";
44 static const char *sites_key="sites";
45 bool_t just_check_config=False;
46 static char *userid=NULL;
49 bool_t background=True;
50 static char *pidfile=NULL;
51 bool_t require_root_privileges=False;
52 cstring_t require_root_privileges_explanation=NULL;
54 static pid_t secnet_pid;
56 /* Structures dealing with poll() call */
57 struct poll_interest {
58 beforepoll_fn *before; /* 0 if deregistered and waiting to be deleted */
63 LIST_ENTRY(poll_interest) entry;
65 static LIST_HEAD(, poll_interest) reg = LIST_HEAD_INITIALIZER(®);
67 static bool_t interest_isregistered(const struct poll_interest *i)
72 static bool_t finished=False;
74 /* Parse the command line options */
75 static void parse_options(int argc, char **argv)
81 static struct option long_options[] = {
82 {"verbose", 0, 0, 'v'},
83 {"nowarnings", 0, 0, 'w'},
86 {"nodetach", 0, 0, 'n'},
87 {"managed", 0, 0, 'm'},
88 {"silent", 0, 0, 'f'},
91 {"config", 1, 0, 'c'},
92 {"just-check-config", 0, 0, 'j'},
93 {"sites-key", 1, 0, 's'},
97 c=getopt_long(argc, argv, "vwdnjc:ft:s:m",
98 long_options, &option_index);
105 printf("Usage: secnet [OPTION]...\n\n"
106 " -f, --silent, --quiet suppress error messages\n"
107 " -w, --nowarnings suppress warnings\n"
108 " -v, --verbose output extra diagnostics\n"
109 " -c, --config=filename specify a configuration file\n"
110 " -j, --just-check-config stop after reading "
111 "configuration file\n"
112 " -s, --sites-key=name configuration key that "
113 "specifies active sites\n"
114 " -n, --nodetach do not run in background\n"
115 " -m, --managed running under a supervisor\n"
116 " -d, --debug output debug messages\n"
117 " --help display this help and exit\n"
118 " --version output version information "
126 printf("%s\n",version);
131 message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE|M_DEBUG;
134 message_level|=M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY|
139 message_level&=(~M_WARNING);
143 message_level=M_FATAL;
151 secnet_is_daemon=True;
156 configfile=safe_strdup(optarg,"config_filename");
158 fatal("secnet: no config filename specified");
162 just_check_config=True;
167 sites_key=safe_strdup(optarg,"sites-key");
169 fatal("secnet: no sites key specified");
177 Message(M_ERR,"secnet: Unknown getopt code %c\n",c);
181 if (argc-optind != 0) {
182 Message(M_ERR,"secnet: You gave extra command line parameters, "
183 "which were ignored.\n");
187 static void setup(dict_t *config)
194 l=dict_lookup(config,"system");
196 if (!l || list_elem(l,0)->type!=t_dict) {
197 fatal("configuration does not include a \"system\" dictionary");
199 system=list_elem(l,0)->data.dict;
200 loc=list_elem(l,0)->loc;
202 /* Arrange systemwide log facility */
203 l=dict_lookup(system,"log");
205 fatal("configuration does not include a system/log facility");
207 system_log=init_log(l);
209 /* Who are we supposed to run as? */
210 userid=dict_read_string(system,"userid",False,"system",loc);
212 if (!(pw=getpwnam(userid)))
213 fatal("userid \"%s\" not found",userid);
219 pidfile=dict_read_string(system,"pidfile",False,"system",loc);
221 /* Check whether we need root privileges */
222 if (require_root_privileges && uid!=0) {
223 fatal("the configured feature \"%s\" requires "
224 "that secnet retain root privileges while running.",
225 require_root_privileges_explanation);
229 static void start_sites(dict_t *config) {
234 /* Go along site list, starting sites */
235 l=dict_lookup(config,sites_key);
237 Message(M_WARNING,"secnet: configuration key \"%s\" is missing; no "
238 "remote sites are defined\n",sites_key);
241 while ((site=list_elem(l, i++))) {
243 if (site->type!=t_closure) {
244 cfgfatal(site->loc,"system","non-closure in site list");
246 if (site->data.closure->type!=CL_SITE) {
247 cfgfatal(site->loc,"system","non-site closure in site list");
249 s=site->data.closure->interface;
255 struct poll_interest *register_for_poll(void *st, beforepoll_fn *before,
256 afterpoll_fn *after, cstring_t desc)
258 struct poll_interest *i;
266 LIST_INSERT_HEAD(®, i, entry);
270 void deregister_for_poll(struct poll_interest *i)
272 /* We cannot simply throw this away because we're reentrantly
273 * inside the main loop, which needs to remember which range of
274 * fds corresponds to this now-obsolete interest */
278 static void system_phase_hook(void *sst, uint32_t newphase)
280 if (newphase==PHASE_SHUTDOWN && pidfile) {
281 /* Try to unlink the pidfile; don't care if it fails */
287 static int fakepoll(struct pollfd *fds, int nfds, int timeout) {
288 fd_set infds[1], outfds[1];
289 int maxfd = -1, i, rc;
290 struct timeval tvtimeout;
293 for(i = 0; i < nfds; ++i) {
294 if(fds[i].events & POLLIN)
295 FD_SET(fds[i].fd, infds);
296 if(fds[i].events & POLLOUT)
297 FD_SET(fds[i].fd, outfds);
298 if(fds[i].fd > maxfd)
302 tvtimeout.tv_sec = timeout / 1000;
303 tvtimeout.tv_usec = 1000 * (timeout % 1000);
305 rc = select(maxfd + 1, infds, outfds, NULL,
306 timeout == -1 ? NULL : &tvtimeout);
308 for(i = 0; i < nfds; ++i) {
310 if(FD_ISSET(fds[i].fd, infds))
312 if(FD_ISSET(fds[i].fd, outfds))
314 fds[i].revents = revents;
321 struct timeval tv_now_global;
324 static void run(void)
326 struct poll_interest *i, *itmp;
329 struct pollfd *fds=0;
330 int allocdfds=0, shortfall=0;
333 if (gettimeofday(&tv_now_global, NULL)!=0) {
334 fatal_perror("main loop: gettimeofday");
336 now_global=((uint64_t)tv_now_global.tv_sec*(uint64_t)1000)+
337 ((uint64_t)tv_now_global.tv_usec/(uint64_t)1000);
339 LIST_FOREACH(i, ®, entry) {
341 if (interest_isregistered(i)) {
342 for (check=0; check<i->nfds; check++) {
343 if(fds[idx+check].revents & POLLNVAL) {
344 fatal("run: poll (%s#%d) set POLLNVAL", i->desc, check);
347 i->after(i->state, fds+idx, i->nfds);
353 allocdfds += shortfall;
354 REALLOC_ARY(fds,allocdfds);
359 LIST_FOREACH_SAFE(i, ®, entry, itmp) {
360 int remain=allocdfds-idx;
362 if (interest_isregistered(i)) {
363 rv=i->before(i->state, fds+idx, &nfds, &timeout);
366 fatal("run: beforepoll_fn (%s) returns %d",i->desc,rv);
367 assert(nfds < INT_MAX/4 - shortfall);
368 shortfall += nfds-remain;
376 fatal("run: beforepoll_fn (%s) set timeout to %d",
379 if (!interest_isregistered(i)) {
380 /* check this here, rather than earlier, so that we
381 handle the case where i->before() calls deregister */
382 LIST_REMOVE(i, entry);
392 rv=fakepoll(fds, idx, timeout);
394 rv=poll(fds, idx, timeout);
398 fatal_perror("run: poll");
406 bool_t will_droppriv(void)
408 assert(current_phase >= PHASE_SETUP);
412 /* Surrender privileges, if necessary */
413 static void droppriv(void)
417 fatal_perror("can't set gid to %ld",(long)gid);
418 if (initgroups(userid, gid) < 0)
419 fatal_perror("initgroups");
420 if (setuid(uid)!=0) {
421 fatal_perror("can't set uid to \"%s\"",userid);
423 assert(getuid() == uid);
424 assert(geteuid() == uid);
425 assert(getgid() == gid);
426 assert(getegid() == gid);
430 /* Become a daemon, if necessary */
431 static void become_daemon(void)
437 add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL);
439 /* We only want to become a daemon if we are not one
441 if (background && !secnet_is_daemon) {
444 /* Parent process - just exit */
447 /* Child process - all done, just carry on */
448 secnet_is_daemon=True;
450 fatal_perror("setsid");
453 fatal_perror("cannot fork");
457 if (secnet_is_daemon) {
458 /* stderr etc are redirected to the system/log facility */
459 pipe_cloexec(errfds);
460 if (dup2(errfds[1],0) < 0
461 || dup2(errfds[1],1) < 0
462 || dup2(errfds[1],2) < 0)
463 fatal_perror("can't dup2 pipe");
464 if (close(errfds[1]) < 0)
465 fatal_perror("can't close redundant pipe endpoint");
466 log_from_fd(errfds[0],"stderr",system_log);
470 /* Now we can write the pidfile */
472 pf=fopen(pidfile,"w");
474 fatal_perror("cannot open pidfile \"%s\"",pidfile);
476 if (fprintf(pf,"%ld\n",(long)secnet_pid) < 0
478 fatal_perror("cannot write to pidfile \"%s\"",pidfile);
482 static signal_notify_fn finish,ignore_hup;
483 static void finish(void *st, int signum)
486 Message(M_NOTICE,"%s [%d]: received %s\n",version,secnet_pid,(string_t)st);
488 static void ignore_hup(void *st, int signum)
490 Message(M_INFO,"%s [%d]: received SIGHUP\n",version,secnet_pid);
494 int main(int argc, char **argv)
501 enter_phase(PHASE_GETOPTS);
502 parse_options(argc,argv);
503 log_early_setlevel();
505 enter_phase(PHASE_READCONFIG);
506 config=read_conffile(configfile);
508 enter_phase(PHASE_SETUP);
512 if (just_check_config) {
513 Message(M_INFO,"configuration file check complete\n");
517 enter_phase(PHASE_DAEMONIZE);
519 Message(M_NOTICE,"%s [%d]: starting\n",version,secnet_pid);
521 enter_phase(PHASE_GETRESOURCES);
522 /* Appropriate phase hooks will have been run */
524 enter_phase(PHASE_DROPPRIV);
527 start_signal_handling();
528 request_signal_notification(SIGTERM,finish,safe_strdup("SIGTERM","run"));
529 if (!background) request_signal_notification(SIGINT,finish,
530 safe_strdup("SIGINT","run"));
531 request_signal_notification(SIGHUP,ignore_hup,NULL);
532 enter_phase(PHASE_RUN);
535 enter_phase(PHASE_SHUTDOWN);
536 Message(M_NOTICE,"%s [%d]: finished\n",version,secnet_pid);