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