Commit | Line | Data |
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974d0468 | 1 | extern char version[]; |
2fe58dfd | 2 | |
8689b3a9 | 3 | #include "secnet.h" |
2fe58dfd SE |
4 | #include <stdio.h> |
5 | #include <string.h> | |
6 | #include <getopt.h> | |
2fe58dfd | 7 | #include <errno.h> |
8689b3a9 | 8 | #include <unistd.h> |
2fe58dfd | 9 | #include <sys/socket.h> |
2fe58dfd | 10 | #include <arpa/inet.h> |
2fe58dfd | 11 | #include <pwd.h> |
2fe58dfd | 12 | |
2fe58dfd SE |
13 | #include "util.h" |
14 | #include "conffile.h" | |
7138d0c5 | 15 | #include "process.h" |
2fe58dfd | 16 | |
b2a56f7c | 17 | /* XXX should be from autoconf */ |
fe5e9cc4 SE |
18 | static const char *configfile="/etc/secnet/secnet.conf"; |
19 | static const char *sites_key="sites"; | |
baa06aeb | 20 | bool_t just_check_config=False; |
2fe58dfd SE |
21 | static char *userid=NULL; |
22 | static uid_t uid=0; | |
b2a56f7c | 23 | bool_t background=True; |
2fe58dfd | 24 | static char *pidfile=NULL; |
9d3a4132 | 25 | bool_t require_root_privileges=False; |
fe5e9cc4 | 26 | cstring_t require_root_privileges_explanation=NULL; |
2fe58dfd | 27 | |
7138d0c5 SE |
28 | static pid_t secnet_pid; |
29 | ||
30 | /* from log.c */ | |
31 | extern uint32_t message_level; | |
32 | extern bool_t secnet_is_daemon; | |
33 | extern struct log_if *system_log; | |
34 | ||
35 | /* from process.c */ | |
36 | extern void start_signal_handling(void); | |
37 | ||
2fe58dfd SE |
38 | /* Structures dealing with poll() call */ |
39 | struct poll_interest { | |
40 | beforepoll_fn *before; | |
41 | afterpoll_fn *after; | |
42 | void *state; | |
43 | uint32_t max_nfds; | |
44 | uint32_t nfds; | |
fe5e9cc4 | 45 | cstring_t desc; |
2fe58dfd SE |
46 | struct poll_interest *next; |
47 | }; | |
48 | static struct poll_interest *reg=NULL; | |
49 | static uint32_t total_nfds=10; | |
50 | ||
51 | static bool_t finished=False; | |
52 | ||
53 | /* Parse the command line options */ | |
54 | static void parse_options(int argc, char **argv) | |
55 | { | |
56 | int c; | |
57 | ||
58 | while (True) { | |
59 | int option_index = 0; | |
60 | static struct option long_options[] = { | |
61 | {"verbose", 0, 0, 'v'}, | |
62 | {"nowarnings", 0, 0, 'w'}, | |
63 | {"help", 0, 0, 2}, | |
64 | {"version", 0, 0, 1}, | |
65 | {"nodetach", 0, 0, 'n'}, | |
66 | {"silent", 0, 0, 'f'}, | |
67 | {"quiet", 0, 0, 'f'}, | |
68 | {"debug", 1, 0, 'd'}, | |
69 | {"config", 1, 0, 'c'}, | |
baa06aeb | 70 | {"just-check-config", 0, 0, 'j'}, |
794f2398 | 71 | {"sites-key", 1, 0, 's'}, |
2fe58dfd SE |
72 | {0,0,0,0} |
73 | }; | |
74 | ||
794f2398 | 75 | c=getopt_long(argc, argv, "vwdnjc:ft:s:", |
2fe58dfd SE |
76 | long_options, &option_index); |
77 | if (c==-1) | |
78 | break; | |
79 | ||
80 | switch(c) { | |
81 | case 2: | |
82 | /* Help */ | |
4f5e39ec SE |
83 | printf("Usage: secnet [OPTION]...\n\n" |
84 | " -f, --silent, --quiet suppress error messages\n" | |
85 | " -w, --nowarnings suppress warnings\n" | |
86 | " -v, --verbose output extra diagnostics\n" | |
87 | " -c, --config=filename specify a configuration file\n" | |
88 | " -j, --just-check-config stop after reading " | |
89 | "configuration file\n" | |
90 | " -s, --sites-key=name configuration key that " | |
91 | "specifies active sites\n" | |
92 | " -n, --nodetach do not run in background\n" | |
93 | " -d, --debug=item,... set debug options\n" | |
94 | " --help display this help and exit\n" | |
95 | " --version output version information " | |
96 | "and exit\n" | |
2fe58dfd SE |
97 | ); |
98 | exit(0); | |
99 | break; | |
100 | ||
101 | case 1: | |
102 | /* Version */ | |
4f5e39ec | 103 | printf("%s\n",version); |
2fe58dfd SE |
104 | exit(0); |
105 | break; | |
106 | ||
107 | case 'v': | |
469fd1d9 | 108 | message_level|=M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY| |
b2a56f7c | 109 | M_FATAL; |
2fe58dfd SE |
110 | break; |
111 | ||
b2a56f7c SE |
112 | case 'w': |
113 | message_level&=(~M_WARNING); | |
2fe58dfd SE |
114 | break; |
115 | ||
116 | case 'd': | |
b2a56f7c | 117 | message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE|M_DEBUG; |
2fe58dfd SE |
118 | break; |
119 | ||
120 | case 'f': | |
121 | message_level=M_FATAL; | |
122 | break; | |
123 | ||
b2a56f7c SE |
124 | case 'n': |
125 | background=False; | |
126 | break; | |
127 | ||
2fe58dfd SE |
128 | case 'c': |
129 | if (optarg) | |
130 | configfile=safe_strdup(optarg,"config_filename"); | |
131 | else | |
132 | fatal("secnet: no config filename specified"); | |
133 | break; | |
134 | ||
baa06aeb SE |
135 | case 'j': |
136 | just_check_config=True; | |
137 | break; | |
138 | ||
794f2398 SE |
139 | case 's': |
140 | if (optarg) | |
141 | sites_key=safe_strdup(optarg,"sites-key"); | |
142 | else | |
143 | fatal("secnet: no sites key specified"); | |
144 | break; | |
145 | ||
2fe58dfd SE |
146 | case '?': |
147 | break; | |
148 | ||
149 | default: | |
469fd1d9 | 150 | Message(M_ERR,"secnet: Unknown getopt code %c\n",c); |
2fe58dfd SE |
151 | } |
152 | } | |
153 | ||
154 | if (argc-optind != 0) { | |
469fd1d9 | 155 | Message(M_ERR,"secnet: You gave extra command line parameters, " |
2fe58dfd SE |
156 | "which were ignored.\n"); |
157 | } | |
158 | } | |
159 | ||
160 | static void setup(dict_t *config) | |
161 | { | |
162 | list_t *l; | |
163 | item_t *site; | |
164 | dict_t *system; | |
2fe58dfd SE |
165 | struct passwd *pw; |
166 | struct cloc loc; | |
167 | int i; | |
168 | ||
169 | l=dict_lookup(config,"system"); | |
170 | ||
171 | if (!l || list_elem(l,0)->type!=t_dict) { | |
4f5e39ec | 172 | fatal("configuration does not include a \"system\" dictionary"); |
2fe58dfd SE |
173 | } |
174 | system=list_elem(l,0)->data.dict; | |
175 | loc=list_elem(l,0)->loc; | |
176 | ||
177 | /* Arrange systemwide log facility */ | |
178 | l=dict_lookup(system,"log"); | |
179 | if (!l) { | |
4f5e39ec | 180 | fatal("configuration does not include a system/log facility"); |
2fe58dfd | 181 | } |
b2a56f7c | 182 | system_log=init_log(l); |
2fe58dfd SE |
183 | |
184 | /* Who are we supposed to run as? */ | |
185 | userid=dict_read_string(system,"userid",False,"system",loc); | |
186 | if (userid) { | |
187 | do { | |
188 | pw=getpwent(); | |
189 | if (pw && strcmp(pw->pw_name,userid)==0) { | |
190 | uid=pw->pw_uid; | |
191 | break; | |
192 | } | |
193 | } while(pw); | |
194 | endpwent(); | |
195 | if (uid==0) { | |
4f5e39ec | 196 | fatal("userid \"%s\" not found",userid); |
2fe58dfd SE |
197 | } |
198 | } | |
199 | ||
200 | /* Pidfile name */ | |
201 | pidfile=dict_read_string(system,"pidfile",False,"system",loc); | |
202 | ||
9d3a4132 SE |
203 | /* Check whether we need root privileges */ |
204 | if (require_root_privileges && uid!=0) { | |
4f5e39ec SE |
205 | fatal("the configured feature \"%s\" requires " |
206 | "that secnet retain root privileges while running.", | |
9d3a4132 SE |
207 | require_root_privileges_explanation); |
208 | } | |
209 | ||
2fe58dfd | 210 | /* Go along site list, starting sites */ |
794f2398 | 211 | l=dict_lookup(config,sites_key); |
2fe58dfd | 212 | if (!l) { |
794f2398 SE |
213 | Message(M_WARNING,"secnet: configuration key \"%s\" is missing; no " |
214 | "remote sites are defined\n",sites_key); | |
9d3a4132 SE |
215 | } else { |
216 | i=0; | |
217 | while ((site=list_elem(l, i++))) { | |
218 | struct site_if *s; | |
219 | if (site->type!=t_closure) { | |
220 | cfgfatal(site->loc,"system","non-closure in site list"); | |
221 | } | |
222 | if (site->data.closure->type!=CL_SITE) { | |
223 | cfgfatal(site->loc,"system","non-site closure in site list"); | |
224 | } | |
225 | s=site->data.closure->interface; | |
226 | s->control(s->st,True); | |
2fe58dfd | 227 | } |
2fe58dfd SE |
228 | } |
229 | } | |
230 | ||
231 | void register_for_poll(void *st, beforepoll_fn *before, | |
fe5e9cc4 | 232 | afterpoll_fn *after, uint32_t max_nfds, cstring_t desc) |
2fe58dfd SE |
233 | { |
234 | struct poll_interest *i; | |
235 | ||
236 | i=safe_malloc(sizeof(*i),"register_for_poll"); | |
237 | i->before=before; | |
238 | i->after=after; | |
239 | i->state=st; | |
240 | i->max_nfds=max_nfds; | |
241 | i->nfds=0; | |
242 | i->desc=desc; | |
243 | total_nfds+=max_nfds; | |
244 | i->next=reg; | |
245 | reg=i; | |
246 | return; | |
247 | } | |
248 | ||
249 | static void system_phase_hook(void *sst, uint32_t newphase) | |
250 | { | |
251 | if (newphase==PHASE_SHUTDOWN && pidfile) { | |
252 | /* Try to unlink the pidfile; don't care if it fails */ | |
253 | unlink(pidfile); | |
254 | } | |
255 | } | |
256 | ||
257 | static void run(void) | |
258 | { | |
259 | struct timeval tv_now; | |
260 | uint64_t now; | |
261 | struct poll_interest *i; | |
262 | int rv, nfds, remain, idx; | |
263 | int timeout; | |
264 | struct pollfd *fds; | |
265 | ||
3b83c932 | 266 | fds=safe_malloc(sizeof(*fds)*total_nfds, "run"); |
2fe58dfd | 267 | |
7138d0c5 | 268 | Message(M_NOTICE,"%s [%d]: starting\n",version,secnet_pid); |
b2a56f7c | 269 | |
7138d0c5 | 270 | do { |
2fe58dfd SE |
271 | if (gettimeofday(&tv_now, NULL)!=0) { |
272 | fatal_perror("main loop: gettimeofday"); | |
273 | } | |
d3fe100d SE |
274 | now=((uint64_t)tv_now.tv_sec*(uint64_t)1000)+ |
275 | ((uint64_t)tv_now.tv_usec/(uint64_t)1000); | |
2fe58dfd SE |
276 | idx=0; |
277 | for (i=reg; i; i=i->next) { | |
278 | i->after(i->state, fds+idx, i->nfds, &tv_now, &now); | |
279 | idx+=i->nfds; | |
280 | } | |
281 | remain=total_nfds; | |
282 | idx=0; | |
283 | timeout=-1; | |
284 | for (i=reg; i; i=i->next) { | |
285 | nfds=remain; | |
286 | rv=i->before(i->state, fds+idx, &nfds, &timeout, &tv_now, &now); | |
287 | if (rv!=0) { | |
288 | /* XXX we need to handle this properly: increase the | |
289 | nfds available */ | |
4f5e39ec | 290 | fatal("run: beforepoll_fn (%s) returns %d",i->desc,rv); |
2fe58dfd SE |
291 | } |
292 | if (timeout<-1) { | |
4f5e39ec | 293 | fatal("run: beforepoll_fn (%s) set timeout to %d",timeout); |
2fe58dfd SE |
294 | } |
295 | idx+=nfds; | |
296 | remain-=nfds; | |
297 | i->nfds=nfds; | |
298 | } | |
299 | do { | |
7138d0c5 | 300 | if (finished) break; |
2fe58dfd SE |
301 | rv=poll(fds, idx, timeout); |
302 | if (rv<0) { | |
303 | if (errno!=EINTR) { | |
304 | fatal_perror("run: poll"); | |
305 | } | |
306 | } | |
307 | } while (rv<0); | |
7138d0c5 | 308 | } while (!finished); |
3b83c932 | 309 | free(fds); |
2fe58dfd SE |
310 | } |
311 | ||
312 | static void droppriv(void) | |
313 | { | |
314 | FILE *pf=NULL; | |
315 | pid_t p; | |
fe5e9cc4 | 316 | int errfds[2]; |
2fe58dfd SE |
317 | |
318 | add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL); | |
319 | ||
b2a56f7c SE |
320 | /* Open the pidfile for writing now: we may be unable to do so |
321 | once we drop privileges. */ | |
322 | if (pidfile) { | |
323 | pf=fopen(pidfile,"w"); | |
324 | if (!pf) { | |
325 | fatal_perror("cannot open pidfile \"%s\"",pidfile); | |
2fe58dfd | 326 | } |
b2a56f7c SE |
327 | } |
328 | if (!background && pf) { | |
329 | fprintf(pf,"%d\n",getpid()); | |
330 | fclose(pf); | |
331 | } | |
332 | ||
333 | /* Now drop privileges */ | |
334 | if (uid!=0) { | |
335 | if (setuid(uid)!=0) { | |
336 | fatal_perror("can't set uid to \"%s\"",userid); | |
337 | } | |
338 | } | |
339 | if (background) { | |
2fe58dfd SE |
340 | p=fork(); |
341 | if (p>0) { | |
342 | if (pf) { | |
343 | /* Parent process - write pidfile, exit */ | |
344 | fprintf(pf,"%d\n",p); | |
345 | fclose(pf); | |
346 | } | |
347 | exit(0); | |
348 | } else if (p==0) { | |
349 | /* Child process - all done, just carry on */ | |
350 | if (pf) fclose(pf); | |
fe5e9cc4 SE |
351 | /* Close stdin and stdout; we don't need them any more. |
352 | stderr is redirected to the system/log facility */ | |
353 | if (pipe(errfds)!=0) { | |
354 | fatal_perror("can't create pipe for stderr"); | |
355 | } | |
8dea8d37 SE |
356 | close(0); |
357 | close(1); | |
fe5e9cc4 SE |
358 | close(2); |
359 | dup2(errfds[1],0); | |
360 | dup2(errfds[1],1); | |
361 | dup2(errfds[1],2); | |
b2a56f7c | 362 | secnet_is_daemon=True; |
ff05a229 | 363 | setsid(); |
fe5e9cc4 | 364 | log_from_fd(errfds[0],"stderr",system_log); |
2fe58dfd SE |
365 | } else { |
366 | /* Error */ | |
367 | fatal_perror("cannot fork"); | |
368 | exit(1); | |
369 | } | |
2fe58dfd | 370 | } |
7138d0c5 SE |
371 | secnet_pid=getpid(); |
372 | } | |
2fe58dfd | 373 | |
7138d0c5 SE |
374 | static signal_notify_fn finish,ignore_hup; |
375 | static void finish(void *st, int signum) | |
376 | { | |
377 | finished=True; | |
378 | Message(M_NOTICE,"%s [%d]: received %s\n",version,secnet_pid,(string_t)st); | |
379 | } | |
380 | static void ignore_hup(void *st, int signum) | |
381 | { | |
382 | Message(M_INFO,"%s [%d]: received SIGHUP\n",version,secnet_pid); | |
383 | return; | |
2fe58dfd SE |
384 | } |
385 | ||
386 | int main(int argc, char **argv) | |
387 | { | |
388 | dict_t *config; | |
389 | ||
390 | enter_phase(PHASE_GETOPTS); | |
391 | parse_options(argc,argv); | |
392 | ||
393 | enter_phase(PHASE_READCONFIG); | |
394 | config=read_conffile(configfile); | |
395 | ||
396 | enter_phase(PHASE_SETUP); | |
397 | setup(config); | |
baa06aeb SE |
398 | |
399 | if (just_check_config) { | |
400 | Message(M_INFO,"configuration file check complete\n"); | |
401 | exit(0); | |
402 | } | |
403 | ||
404 | enter_phase(PHASE_GETRESOURCES); | |
405 | /* Appropriate phase hooks will have been run */ | |
2fe58dfd SE |
406 | |
407 | enter_phase(PHASE_DROPPRIV); | |
408 | droppriv(); | |
409 | ||
7138d0c5 | 410 | start_signal_handling(); |
fe5e9cc4 SE |
411 | request_signal_notification(SIGTERM,finish,safe_strdup("SIGTERM","run")); |
412 | if (!background) request_signal_notification(SIGINT,finish, | |
413 | safe_strdup("SIGINT","run")); | |
7138d0c5 | 414 | request_signal_notification(SIGHUP,ignore_hup,NULL); |
042a8da9 | 415 | enter_phase(PHASE_RUN); |
2fe58dfd SE |
416 | run(); |
417 | ||
418 | enter_phase(PHASE_SHUTDOWN); | |
7138d0c5 | 419 | Message(M_NOTICE,"%s [%d]: finished\n",version,secnet_pid); |
2fe58dfd SE |
420 | |
421 | return 0; | |
422 | } |