| 1 | #include "secnet.h" |
| 2 | #include <stdio.h> |
| 3 | #include <assert.h> |
| 4 | #include <limits.h> |
| 5 | #include <string.h> |
| 6 | #include <getopt.h> |
| 7 | #include <errno.h> |
| 8 | #include <unistd.h> |
| 9 | #include <sys/socket.h> |
| 10 | #include <arpa/inet.h> |
| 11 | #include <pwd.h> |
| 12 | |
| 13 | #include "util.h" |
| 14 | #include "conffile.h" |
| 15 | #include "process.h" |
| 16 | |
| 17 | /* XXX should be from autoconf */ |
| 18 | static const char *configfile="/etc/secnet/secnet.conf"; |
| 19 | static const char *sites_key="sites"; |
| 20 | bool_t just_check_config=False; |
| 21 | static char *userid=NULL; |
| 22 | static uid_t uid=0; |
| 23 | bool_t background=True; |
| 24 | static char *pidfile=NULL; |
| 25 | bool_t require_root_privileges=False; |
| 26 | cstring_t require_root_privileges_explanation=NULL; |
| 27 | |
| 28 | static pid_t secnet_pid; |
| 29 | |
| 30 | /* Structures dealing with poll() call */ |
| 31 | struct poll_interest { |
| 32 | beforepoll_fn *before; |
| 33 | afterpoll_fn *after; |
| 34 | void *state; |
| 35 | int32_t max_nfds; |
| 36 | int32_t nfds; |
| 37 | cstring_t desc; |
| 38 | struct poll_interest *next; |
| 39 | }; |
| 40 | static struct poll_interest *reg=NULL; |
| 41 | static int32_t total_nfds=10; |
| 42 | |
| 43 | static bool_t finished=False; |
| 44 | |
| 45 | /* Parse the command line options */ |
| 46 | static void parse_options(int argc, char **argv) |
| 47 | { |
| 48 | int c; |
| 49 | |
| 50 | while (True) { |
| 51 | int option_index = 0; |
| 52 | static struct option long_options[] = { |
| 53 | {"verbose", 0, 0, 'v'}, |
| 54 | {"nowarnings", 0, 0, 'w'}, |
| 55 | {"help", 0, 0, 2}, |
| 56 | {"version", 0, 0, 1}, |
| 57 | {"nodetach", 0, 0, 'n'}, |
| 58 | {"silent", 0, 0, 'f'}, |
| 59 | {"quiet", 0, 0, 'f'}, |
| 60 | {"debug", 1, 0, 'd'}, |
| 61 | {"config", 1, 0, 'c'}, |
| 62 | {"just-check-config", 0, 0, 'j'}, |
| 63 | {"sites-key", 1, 0, 's'}, |
| 64 | {0,0,0,0} |
| 65 | }; |
| 66 | |
| 67 | c=getopt_long(argc, argv, "vwdnjc:ft:s:", |
| 68 | long_options, &option_index); |
| 69 | if (c==-1) |
| 70 | break; |
| 71 | |
| 72 | switch(c) { |
| 73 | case 2: |
| 74 | /* Help */ |
| 75 | printf("Usage: secnet [OPTION]...\n\n" |
| 76 | " -f, --silent, --quiet suppress error messages\n" |
| 77 | " -w, --nowarnings suppress warnings\n" |
| 78 | " -v, --verbose output extra diagnostics\n" |
| 79 | " -c, --config=filename specify a configuration file\n" |
| 80 | " -j, --just-check-config stop after reading " |
| 81 | "configuration file\n" |
| 82 | " -s, --sites-key=name configuration key that " |
| 83 | "specifies active sites\n" |
| 84 | " -n, --nodetach do not run in background\n" |
| 85 | " -d, --debug=item,... set debug options\n" |
| 86 | " --help display this help and exit\n" |
| 87 | " --version output version information " |
| 88 | "and exit\n" |
| 89 | ); |
| 90 | exit(0); |
| 91 | break; |
| 92 | |
| 93 | case 1: |
| 94 | /* Version */ |
| 95 | printf("%s\n",version); |
| 96 | exit(0); |
| 97 | break; |
| 98 | |
| 99 | case 'v': |
| 100 | message_level|=M_INFO|M_NOTICE|M_WARNING|M_ERR|M_SECURITY| |
| 101 | M_FATAL; |
| 102 | break; |
| 103 | |
| 104 | case 'w': |
| 105 | message_level&=(~M_WARNING); |
| 106 | break; |
| 107 | |
| 108 | case 'd': |
| 109 | message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE|M_DEBUG; |
| 110 | break; |
| 111 | |
| 112 | case 'f': |
| 113 | message_level=M_FATAL; |
| 114 | break; |
| 115 | |
| 116 | case 'n': |
| 117 | background=False; |
| 118 | break; |
| 119 | |
| 120 | case 'c': |
| 121 | if (optarg) |
| 122 | configfile=safe_strdup(optarg,"config_filename"); |
| 123 | else |
| 124 | fatal("secnet: no config filename specified"); |
| 125 | break; |
| 126 | |
| 127 | case 'j': |
| 128 | just_check_config=True; |
| 129 | break; |
| 130 | |
| 131 | case 's': |
| 132 | if (optarg) |
| 133 | sites_key=safe_strdup(optarg,"sites-key"); |
| 134 | else |
| 135 | fatal("secnet: no sites key specified"); |
| 136 | break; |
| 137 | |
| 138 | case '?': |
| 139 | break; |
| 140 | |
| 141 | default: |
| 142 | Message(M_ERR,"secnet: Unknown getopt code %c\n",c); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | if (argc-optind != 0) { |
| 147 | Message(M_ERR,"secnet: You gave extra command line parameters, " |
| 148 | "which were ignored.\n"); |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | static void setup(dict_t *config) |
| 153 | { |
| 154 | list_t *l; |
| 155 | item_t *site; |
| 156 | dict_t *system; |
| 157 | struct passwd *pw; |
| 158 | struct cloc loc; |
| 159 | int i; |
| 160 | |
| 161 | l=dict_lookup(config,"system"); |
| 162 | |
| 163 | if (!l || list_elem(l,0)->type!=t_dict) { |
| 164 | fatal("configuration does not include a \"system\" dictionary"); |
| 165 | } |
| 166 | system=list_elem(l,0)->data.dict; |
| 167 | loc=list_elem(l,0)->loc; |
| 168 | |
| 169 | /* Arrange systemwide log facility */ |
| 170 | l=dict_lookup(system,"log"); |
| 171 | if (!l) { |
| 172 | fatal("configuration does not include a system/log facility"); |
| 173 | } |
| 174 | system_log=init_log(l); |
| 175 | |
| 176 | /* Who are we supposed to run as? */ |
| 177 | userid=dict_read_string(system,"userid",False,"system",loc); |
| 178 | if (userid) { |
| 179 | do { |
| 180 | pw=getpwent(); |
| 181 | if (pw && strcmp(pw->pw_name,userid)==0) { |
| 182 | uid=pw->pw_uid; |
| 183 | break; |
| 184 | } |
| 185 | } while(pw); |
| 186 | endpwent(); |
| 187 | if (uid==0) { |
| 188 | fatal("userid \"%s\" not found",userid); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /* Pidfile name */ |
| 193 | pidfile=dict_read_string(system,"pidfile",False,"system",loc); |
| 194 | |
| 195 | /* Check whether we need root privileges */ |
| 196 | if (require_root_privileges && uid!=0) { |
| 197 | fatal("the configured feature \"%s\" requires " |
| 198 | "that secnet retain root privileges while running.", |
| 199 | require_root_privileges_explanation); |
| 200 | } |
| 201 | |
| 202 | /* Go along site list, starting sites */ |
| 203 | l=dict_lookup(config,sites_key); |
| 204 | if (!l) { |
| 205 | Message(M_WARNING,"secnet: configuration key \"%s\" is missing; no " |
| 206 | "remote sites are defined\n",sites_key); |
| 207 | } else { |
| 208 | i=0; |
| 209 | while ((site=list_elem(l, i++))) { |
| 210 | struct site_if *s; |
| 211 | if (site->type!=t_closure) { |
| 212 | cfgfatal(site->loc,"system","non-closure in site list"); |
| 213 | } |
| 214 | if (site->data.closure->type!=CL_SITE) { |
| 215 | cfgfatal(site->loc,"system","non-site closure in site list"); |
| 216 | } |
| 217 | s=site->data.closure->interface; |
| 218 | s->control(s->st,True); |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | void register_for_poll(void *st, beforepoll_fn *before, |
| 224 | afterpoll_fn *after, int32_t max_nfds, cstring_t desc) |
| 225 | { |
| 226 | struct poll_interest *i; |
| 227 | |
| 228 | i=safe_malloc(sizeof(*i),"register_for_poll"); |
| 229 | i->before=before; |
| 230 | i->after=after; |
| 231 | i->state=st; |
| 232 | i->max_nfds=max_nfds; |
| 233 | i->nfds=0; |
| 234 | i->desc=desc; |
| 235 | assert(total_nfds < INT_MAX - max_nfds); |
| 236 | total_nfds+=max_nfds; |
| 237 | i->next=reg; |
| 238 | reg=i; |
| 239 | return; |
| 240 | } |
| 241 | |
| 242 | static void system_phase_hook(void *sst, uint32_t newphase) |
| 243 | { |
| 244 | if (newphase==PHASE_SHUTDOWN && pidfile) { |
| 245 | /* Try to unlink the pidfile; don't care if it fails */ |
| 246 | unlink(pidfile); |
| 247 | } |
| 248 | } |
| 249 | |
| 250 | struct timeval tv_now_global; |
| 251 | uint64_t now_global; |
| 252 | |
| 253 | static void run(void) |
| 254 | { |
| 255 | struct poll_interest *i; |
| 256 | int rv, nfds, remain, idx; |
| 257 | int timeout; |
| 258 | struct pollfd *fds; |
| 259 | |
| 260 | fds=safe_malloc(sizeof(*fds)*total_nfds, "run"); |
| 261 | |
| 262 | Message(M_NOTICE,"%s [%d]: starting\n",version,secnet_pid); |
| 263 | |
| 264 | do { |
| 265 | if (gettimeofday(&tv_now_global, NULL)!=0) { |
| 266 | fatal_perror("main loop: gettimeofday"); |
| 267 | } |
| 268 | now_global=((uint64_t)tv_now_global.tv_sec*(uint64_t)1000)+ |
| 269 | ((uint64_t)tv_now_global.tv_usec/(uint64_t)1000); |
| 270 | idx=0; |
| 271 | for (i=reg; i; i=i->next) { |
| 272 | i->after(i->state, fds+idx, i->nfds); |
| 273 | idx+=i->nfds; |
| 274 | } |
| 275 | remain=total_nfds; |
| 276 | idx=0; |
| 277 | timeout=-1; |
| 278 | for (i=reg; i; i=i->next) { |
| 279 | nfds=remain; |
| 280 | rv=i->before(i->state, fds+idx, &nfds, &timeout); |
| 281 | if (rv!=0) { |
| 282 | /* XXX we need to handle this properly: increase the |
| 283 | nfds available */ |
| 284 | fatal("run: beforepoll_fn (%s) returns %d",i->desc,rv); |
| 285 | } |
| 286 | if (timeout<-1) { |
| 287 | fatal("run: beforepoll_fn (%s) set timeout to %d",timeout); |
| 288 | } |
| 289 | idx+=nfds; |
| 290 | remain-=nfds; |
| 291 | i->nfds=nfds; |
| 292 | } |
| 293 | do { |
| 294 | if (finished) break; |
| 295 | rv=poll(fds, idx, timeout); |
| 296 | if (rv<0) { |
| 297 | if (errno!=EINTR) { |
| 298 | fatal_perror("run: poll"); |
| 299 | } |
| 300 | } |
| 301 | } while (rv<0); |
| 302 | } while (!finished); |
| 303 | free(fds); |
| 304 | } |
| 305 | |
| 306 | static void droppriv(void) |
| 307 | { |
| 308 | FILE *pf=NULL; |
| 309 | pid_t p; |
| 310 | int errfds[2]; |
| 311 | |
| 312 | add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL); |
| 313 | |
| 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); |
| 320 | } |
| 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) { |
| 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); |
| 345 | /* Close stdin and stdout; we don't need them any more. |
| 346 | stderr is redirected to the system/log facility */ |
| 347 | if (pipe(errfds)!=0) { |
| 348 | fatal_perror("can't create pipe for stderr"); |
| 349 | } |
| 350 | close(0); |
| 351 | close(1); |
| 352 | close(2); |
| 353 | dup2(errfds[1],0); |
| 354 | dup2(errfds[1],1); |
| 355 | dup2(errfds[1],2); |
| 356 | secnet_is_daemon=True; |
| 357 | setsid(); |
| 358 | log_from_fd(errfds[0],"stderr",system_log); |
| 359 | } else { |
| 360 | /* Error */ |
| 361 | fatal_perror("cannot fork"); |
| 362 | exit(1); |
| 363 | } |
| 364 | } |
| 365 | secnet_pid=getpid(); |
| 366 | } |
| 367 | |
| 368 | static signal_notify_fn finish,ignore_hup; |
| 369 | static void finish(void *st, int signum) |
| 370 | { |
| 371 | finished=True; |
| 372 | Message(M_NOTICE,"%s [%d]: received %s\n",version,secnet_pid,(string_t)st); |
| 373 | } |
| 374 | static void ignore_hup(void *st, int signum) |
| 375 | { |
| 376 | Message(M_INFO,"%s [%d]: received SIGHUP\n",version,secnet_pid); |
| 377 | return; |
| 378 | } |
| 379 | |
| 380 | int main(int argc, char **argv) |
| 381 | { |
| 382 | dict_t *config; |
| 383 | |
| 384 | enter_phase(PHASE_GETOPTS); |
| 385 | parse_options(argc,argv); |
| 386 | |
| 387 | enter_phase(PHASE_READCONFIG); |
| 388 | config=read_conffile(configfile); |
| 389 | |
| 390 | enter_phase(PHASE_SETUP); |
| 391 | setup(config); |
| 392 | |
| 393 | if (just_check_config) { |
| 394 | Message(M_INFO,"configuration file check complete\n"); |
| 395 | exit(0); |
| 396 | } |
| 397 | |
| 398 | enter_phase(PHASE_GETRESOURCES); |
| 399 | /* Appropriate phase hooks will have been run */ |
| 400 | |
| 401 | enter_phase(PHASE_DROPPRIV); |
| 402 | droppriv(); |
| 403 | |
| 404 | start_signal_handling(); |
| 405 | request_signal_notification(SIGTERM,finish,safe_strdup("SIGTERM","run")); |
| 406 | if (!background) request_signal_notification(SIGINT,finish, |
| 407 | safe_strdup("SIGINT","run")); |
| 408 | request_signal_notification(SIGHUP,ignore_hup,NULL); |
| 409 | enter_phase(PHASE_RUN); |
| 410 | run(); |
| 411 | |
| 412 | enter_phase(PHASE_SHUTDOWN); |
| 413 | Message(M_NOTICE,"%s [%d]: finished\n",version,secnet_pid); |
| 414 | |
| 415 | return 0; |
| 416 | } |