Commit | Line | Data |
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2fe58dfd SE |
1 | /* $Log: secnet.c,v $ |
2 | * Revision 1.1 1996/03/13 22:27:41 sde1000 | |
3 | * Initial revision | |
4 | * | |
5 | */ | |
6 | ||
974d0468 | 7 | extern char version[]; |
2fe58dfd | 8 | |
8689b3a9 | 9 | #include "secnet.h" |
2fe58dfd SE |
10 | #include <stdio.h> |
11 | #include <string.h> | |
12 | #include <getopt.h> | |
2fe58dfd | 13 | #include <errno.h> |
8689b3a9 | 14 | #include <unistd.h> |
2fe58dfd | 15 | #include <sys/socket.h> |
2fe58dfd | 16 | #include <arpa/inet.h> |
2fe58dfd | 17 | #include <pwd.h> |
2fe58dfd | 18 | |
2fe58dfd SE |
19 | #include "util.h" |
20 | #include "conffile.h" | |
7138d0c5 | 21 | #include "process.h" |
2fe58dfd | 22 | |
b2a56f7c | 23 | /* XXX should be from autoconf */ |
2fe58dfd | 24 | static char *configfile="/etc/secnet/secnet.conf"; |
baa06aeb | 25 | bool_t just_check_config=False; |
2fe58dfd SE |
26 | static char *userid=NULL; |
27 | static uid_t uid=0; | |
b2a56f7c | 28 | bool_t background=True; |
2fe58dfd | 29 | static char *pidfile=NULL; |
9d3a4132 SE |
30 | bool_t require_root_privileges=False; |
31 | string_t require_root_privileges_explanation=NULL; | |
2fe58dfd | 32 | |
7138d0c5 SE |
33 | static pid_t secnet_pid; |
34 | ||
35 | /* from log.c */ | |
36 | extern uint32_t message_level; | |
37 | extern bool_t secnet_is_daemon; | |
38 | extern struct log_if *system_log; | |
39 | ||
40 | /* from process.c */ | |
41 | extern void start_signal_handling(void); | |
42 | ||
2fe58dfd SE |
43 | /* Structures dealing with poll() call */ |
44 | struct poll_interest { | |
45 | beforepoll_fn *before; | |
46 | afterpoll_fn *after; | |
47 | void *state; | |
48 | uint32_t max_nfds; | |
49 | uint32_t nfds; | |
50 | string_t desc; | |
51 | struct poll_interest *next; | |
52 | }; | |
53 | static struct poll_interest *reg=NULL; | |
54 | static uint32_t total_nfds=10; | |
55 | ||
56 | static bool_t finished=False; | |
57 | ||
58 | /* Parse the command line options */ | |
59 | static void parse_options(int argc, char **argv) | |
60 | { | |
61 | int c; | |
62 | ||
63 | while (True) { | |
64 | int option_index = 0; | |
65 | static struct option long_options[] = { | |
66 | {"verbose", 0, 0, 'v'}, | |
67 | {"nowarnings", 0, 0, 'w'}, | |
68 | {"help", 0, 0, 2}, | |
69 | {"version", 0, 0, 1}, | |
70 | {"nodetach", 0, 0, 'n'}, | |
71 | {"silent", 0, 0, 'f'}, | |
72 | {"quiet", 0, 0, 'f'}, | |
73 | {"debug", 1, 0, 'd'}, | |
74 | {"config", 1, 0, 'c'}, | |
baa06aeb | 75 | {"just-check-config", 0, 0, 'j'}, |
2fe58dfd SE |
76 | {0,0,0,0} |
77 | }; | |
78 | ||
baa06aeb | 79 | c=getopt_long(argc, argv, "vwdnjc:ft:", |
2fe58dfd SE |
80 | long_options, &option_index); |
81 | if (c==-1) | |
82 | break; | |
83 | ||
84 | switch(c) { | |
85 | case 2: | |
86 | /* Help */ | |
87 | fprintf(stderr, | |
88 | "Usage: secnet [OPTION]...\n\n" | |
89 | " -f, --silent, --quiet suppress error messages\n" | |
90 | " -w, --nowarnings suppress warnings\n" | |
91 | " -v, --verbose output extra diagnostics\n" | |
92 | " -c, --config=filename specify a configuration file\n" | |
baa06aeb | 93 | " -j, --just-check-config stop after reading configfile\n" |
2fe58dfd SE |
94 | " -n, --nodetach do not run in background\n" |
95 | " -d, --debug=item,... set debug options\n" | |
96 | " --help display this help and exit\n" | |
97 | " --version output version information and exit\n" | |
98 | ); | |
99 | exit(0); | |
100 | break; | |
101 | ||
102 | case 1: | |
103 | /* Version */ | |
104 | fprintf(stderr,"%s\n",version); | |
105 | exit(0); | |
106 | break; | |
107 | ||
108 | case 'v': | |
469fd1d9 | 109 | message_level|=M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY| |
b2a56f7c | 110 | M_FATAL; |
2fe58dfd SE |
111 | break; |
112 | ||
b2a56f7c SE |
113 | case 'w': |
114 | message_level&=(~M_WARNING); | |
2fe58dfd SE |
115 | break; |
116 | ||
117 | case 'd': | |
b2a56f7c | 118 | message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE|M_DEBUG; |
2fe58dfd SE |
119 | break; |
120 | ||
121 | case 'f': | |
122 | message_level=M_FATAL; | |
123 | break; | |
124 | ||
b2a56f7c SE |
125 | case 'n': |
126 | background=False; | |
127 | break; | |
128 | ||
2fe58dfd SE |
129 | case 'c': |
130 | if (optarg) | |
131 | configfile=safe_strdup(optarg,"config_filename"); | |
132 | else | |
133 | fatal("secnet: no config filename specified"); | |
134 | break; | |
135 | ||
baa06aeb SE |
136 | case 'j': |
137 | just_check_config=True; | |
138 | break; | |
139 | ||
2fe58dfd SE |
140 | case '?': |
141 | break; | |
142 | ||
143 | default: | |
469fd1d9 | 144 | Message(M_ERR,"secnet: Unknown getopt code %c\n",c); |
2fe58dfd SE |
145 | } |
146 | } | |
147 | ||
148 | if (argc-optind != 0) { | |
469fd1d9 | 149 | Message(M_ERR,"secnet: You gave extra command line parameters, " |
2fe58dfd SE |
150 | "which were ignored.\n"); |
151 | } | |
152 | } | |
153 | ||
154 | static void setup(dict_t *config) | |
155 | { | |
156 | list_t *l; | |
157 | item_t *site; | |
158 | dict_t *system; | |
2fe58dfd SE |
159 | struct passwd *pw; |
160 | struct cloc loc; | |
161 | int i; | |
162 | ||
163 | l=dict_lookup(config,"system"); | |
164 | ||
165 | if (!l || list_elem(l,0)->type!=t_dict) { | |
166 | fatal("configuration does not include a \"system\" dictionary\n"); | |
167 | } | |
168 | system=list_elem(l,0)->data.dict; | |
169 | loc=list_elem(l,0)->loc; | |
170 | ||
171 | /* Arrange systemwide log facility */ | |
172 | l=dict_lookup(system,"log"); | |
173 | if (!l) { | |
174 | fatal("configuration does not include a system/log facility\n"); | |
175 | } | |
b2a56f7c | 176 | system_log=init_log(l); |
2fe58dfd SE |
177 | |
178 | /* Who are we supposed to run as? */ | |
179 | userid=dict_read_string(system,"userid",False,"system",loc); | |
180 | if (userid) { | |
181 | do { | |
182 | pw=getpwent(); | |
183 | if (pw && strcmp(pw->pw_name,userid)==0) { | |
184 | uid=pw->pw_uid; | |
185 | break; | |
186 | } | |
187 | } while(pw); | |
188 | endpwent(); | |
189 | if (uid==0) { | |
190 | fatal("userid \"%s\" not found\n",userid); | |
191 | } | |
192 | } | |
193 | ||
194 | /* Pidfile name */ | |
195 | pidfile=dict_read_string(system,"pidfile",False,"system",loc); | |
196 | ||
9d3a4132 SE |
197 | /* Check whether we need root privileges */ |
198 | if (require_root_privileges && uid!=0) { | |
199 | fatal("the following configured feature (\"%s\") requires " | |
200 | "that secnet retain root privileges while running.\n", | |
201 | require_root_privileges_explanation); | |
202 | } | |
203 | ||
2fe58dfd SE |
204 | /* Go along site list, starting sites */ |
205 | l=dict_lookup(config,"sites"); | |
206 | if (!l) { | |
9d3a4132 SE |
207 | Message(M_WARNING,"secnet: configuration did not define any " |
208 | "remote sites\n"); | |
209 | } else { | |
210 | i=0; | |
211 | while ((site=list_elem(l, i++))) { | |
212 | struct site_if *s; | |
213 | if (site->type!=t_closure) { | |
214 | cfgfatal(site->loc,"system","non-closure in site list"); | |
215 | } | |
216 | if (site->data.closure->type!=CL_SITE) { | |
217 | cfgfatal(site->loc,"system","non-site closure in site list"); | |
218 | } | |
219 | s=site->data.closure->interface; | |
220 | s->control(s->st,True); | |
2fe58dfd | 221 | } |
2fe58dfd SE |
222 | } |
223 | } | |
224 | ||
225 | void register_for_poll(void *st, beforepoll_fn *before, | |
226 | afterpoll_fn *after, uint32_t max_nfds, string_t desc) | |
227 | { | |
228 | struct poll_interest *i; | |
229 | ||
230 | i=safe_malloc(sizeof(*i),"register_for_poll"); | |
231 | i->before=before; | |
232 | i->after=after; | |
233 | i->state=st; | |
234 | i->max_nfds=max_nfds; | |
235 | i->nfds=0; | |
236 | i->desc=desc; | |
237 | total_nfds+=max_nfds; | |
238 | i->next=reg; | |
239 | reg=i; | |
240 | return; | |
241 | } | |
242 | ||
243 | static void system_phase_hook(void *sst, uint32_t newphase) | |
244 | { | |
245 | if (newphase==PHASE_SHUTDOWN && pidfile) { | |
246 | /* Try to unlink the pidfile; don't care if it fails */ | |
247 | unlink(pidfile); | |
248 | } | |
249 | } | |
250 | ||
251 | static void run(void) | |
252 | { | |
253 | struct timeval tv_now; | |
254 | uint64_t now; | |
255 | struct poll_interest *i; | |
256 | int rv, nfds, remain, idx; | |
257 | int timeout; | |
258 | struct pollfd *fds; | |
259 | ||
260 | fds=alloca(sizeof(*fds)*total_nfds); | |
261 | if (!fds) { | |
262 | fatal("run: couldn't alloca\n"); | |
263 | } | |
264 | ||
7138d0c5 | 265 | Message(M_NOTICE,"%s [%d]: starting\n",version,secnet_pid); |
b2a56f7c | 266 | |
7138d0c5 | 267 | do { |
2fe58dfd SE |
268 | if (gettimeofday(&tv_now, NULL)!=0) { |
269 | fatal_perror("main loop: gettimeofday"); | |
270 | } | |
271 | now=(tv_now.tv_sec*1000)+(tv_now.tv_usec/1000); | |
272 | idx=0; | |
273 | for (i=reg; i; i=i->next) { | |
274 | i->after(i->state, fds+idx, i->nfds, &tv_now, &now); | |
275 | idx+=i->nfds; | |
276 | } | |
277 | remain=total_nfds; | |
278 | idx=0; | |
279 | timeout=-1; | |
280 | for (i=reg; i; i=i->next) { | |
281 | nfds=remain; | |
282 | rv=i->before(i->state, fds+idx, &nfds, &timeout, &tv_now, &now); | |
283 | if (rv!=0) { | |
284 | /* XXX we need to handle this properly: increase the | |
285 | nfds available */ | |
286 | fatal("run: beforepoll_fn (%s) returns %d\n",i->desc,rv); | |
287 | } | |
288 | if (timeout<-1) { | |
289 | fatal("run: beforepoll_fn (%s) set timeout to %d\n",timeout); | |
290 | } | |
291 | idx+=nfds; | |
292 | remain-=nfds; | |
293 | i->nfds=nfds; | |
294 | } | |
295 | do { | |
7138d0c5 | 296 | if (finished) break; |
2fe58dfd SE |
297 | rv=poll(fds, idx, timeout); |
298 | if (rv<0) { | |
299 | if (errno!=EINTR) { | |
300 | fatal_perror("run: poll"); | |
301 | } | |
302 | } | |
303 | } while (rv<0); | |
7138d0c5 | 304 | } while (!finished); |
2fe58dfd SE |
305 | } |
306 | ||
307 | static void droppriv(void) | |
308 | { | |
309 | FILE *pf=NULL; | |
310 | pid_t p; | |
311 | ||
312 | add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL); | |
313 | ||
b2a56f7c SE |
314 | /* Open the pidfile for writing now: we may be unable to do so |
315 | once we drop privileges. */ | |
316 | if (pidfile) { | |
317 | pf=fopen(pidfile,"w"); | |
318 | if (!pf) { | |
319 | fatal_perror("cannot open pidfile \"%s\"",pidfile); | |
2fe58dfd | 320 | } |
b2a56f7c SE |
321 | } |
322 | if (!background && pf) { | |
323 | fprintf(pf,"%d\n",getpid()); | |
324 | fclose(pf); | |
325 | } | |
326 | ||
327 | /* Now drop privileges */ | |
328 | if (uid!=0) { | |
329 | if (setuid(uid)!=0) { | |
330 | fatal_perror("can't set uid to \"%s\"",userid); | |
331 | } | |
332 | } | |
333 | if (background) { | |
2fe58dfd SE |
334 | p=fork(); |
335 | if (p>0) { | |
336 | if (pf) { | |
337 | /* Parent process - write pidfile, exit */ | |
338 | fprintf(pf,"%d\n",p); | |
339 | fclose(pf); | |
340 | } | |
341 | exit(0); | |
342 | } else if (p==0) { | |
343 | /* Child process - all done, just carry on */ | |
344 | if (pf) fclose(pf); | |
8dea8d37 SE |
345 | /* Close stdin, stdout and stderr; we don't need them any more */ |
346 | close(0); | |
347 | close(1); | |
348 | close(2); | |
b2a56f7c | 349 | secnet_is_daemon=True; |
2fe58dfd SE |
350 | } else { |
351 | /* Error */ | |
352 | fatal_perror("cannot fork"); | |
353 | exit(1); | |
354 | } | |
2fe58dfd | 355 | } |
7138d0c5 SE |
356 | secnet_pid=getpid(); |
357 | } | |
2fe58dfd | 358 | |
7138d0c5 SE |
359 | static signal_notify_fn finish,ignore_hup; |
360 | static void finish(void *st, int signum) | |
361 | { | |
362 | finished=True; | |
363 | Message(M_NOTICE,"%s [%d]: received %s\n",version,secnet_pid,(string_t)st); | |
364 | } | |
365 | static void ignore_hup(void *st, int signum) | |
366 | { | |
367 | Message(M_INFO,"%s [%d]: received SIGHUP\n",version,secnet_pid); | |
368 | return; | |
2fe58dfd SE |
369 | } |
370 | ||
371 | int main(int argc, char **argv) | |
372 | { | |
373 | dict_t *config; | |
374 | ||
375 | enter_phase(PHASE_GETOPTS); | |
376 | parse_options(argc,argv); | |
377 | ||
378 | enter_phase(PHASE_READCONFIG); | |
379 | config=read_conffile(configfile); | |
380 | ||
381 | enter_phase(PHASE_SETUP); | |
382 | setup(config); | |
baa06aeb SE |
383 | |
384 | if (just_check_config) { | |
385 | Message(M_INFO,"configuration file check complete\n"); | |
386 | exit(0); | |
387 | } | |
388 | ||
389 | enter_phase(PHASE_GETRESOURCES); | |
390 | /* Appropriate phase hooks will have been run */ | |
2fe58dfd SE |
391 | |
392 | enter_phase(PHASE_DROPPRIV); | |
393 | droppriv(); | |
394 | ||
7138d0c5 SE |
395 | start_signal_handling(); |
396 | request_signal_notification(SIGTERM,finish,"SIGTERM"); | |
397 | if (!background) request_signal_notification(SIGINT,finish,"SIGINT"); | |
398 | request_signal_notification(SIGHUP,ignore_hup,NULL); | |
042a8da9 | 399 | enter_phase(PHASE_RUN); |
2fe58dfd SE |
400 | run(); |
401 | ||
402 | enter_phase(PHASE_SHUTDOWN); | |
7138d0c5 | 403 | Message(M_NOTICE,"%s [%d]: finished\n",version,secnet_pid); |
2fe58dfd SE |
404 | |
405 | return 0; | |
406 | } |