| 1 | /* $Log: secnet.c,v $ |
| 2 | * Revision 1.1 1996/03/13 22:27:41 sde1000 |
| 3 | * Initial revision |
| 4 | * |
| 5 | */ |
| 6 | |
| 7 | extern char version[]; |
| 8 | |
| 9 | #include "secnet.h" |
| 10 | #include <stdio.h> |
| 11 | #include <string.h> |
| 12 | #include <getopt.h> |
| 13 | #include <errno.h> |
| 14 | #include <unistd.h> |
| 15 | #include <sys/socket.h> |
| 16 | #include <arpa/inet.h> |
| 17 | #include <pwd.h> |
| 18 | |
| 19 | #include "util.h" |
| 20 | #include "conffile.h" |
| 21 | |
| 22 | /* Command-line options (possibly config-file options too) */ |
| 23 | static char *configfile="/etc/secnet/secnet.conf"; |
| 24 | bool_t just_check_config=False; |
| 25 | static char *userid=NULL; |
| 26 | static uid_t uid=0; |
| 27 | static bool_t background=True; |
| 28 | static char *pidfile=NULL; |
| 29 | |
| 30 | /* Structures dealing with poll() call */ |
| 31 | struct poll_interest { |
| 32 | beforepoll_fn *before; |
| 33 | afterpoll_fn *after; |
| 34 | void *state; |
| 35 | uint32_t max_nfds; |
| 36 | uint32_t nfds; |
| 37 | string_t desc; |
| 38 | struct poll_interest *next; |
| 39 | }; |
| 40 | static struct poll_interest *reg=NULL; |
| 41 | static uint32_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 | {0,0,0,0} |
| 64 | }; |
| 65 | |
| 66 | c=getopt_long(argc, argv, "vwdnjc:ft:", |
| 67 | long_options, &option_index); |
| 68 | if (c==-1) |
| 69 | break; |
| 70 | |
| 71 | switch(c) { |
| 72 | case 2: |
| 73 | /* Help */ |
| 74 | fprintf(stderr, |
| 75 | "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 configfile\n" |
| 81 | " -n, --nodetach do not run in background\n" |
| 82 | " -d, --debug=item,... set debug options\n" |
| 83 | " --help display this help and exit\n" |
| 84 | " --version output version information and exit\n" |
| 85 | ); |
| 86 | exit(0); |
| 87 | break; |
| 88 | |
| 89 | case 1: |
| 90 | /* Version */ |
| 91 | fprintf(stderr,"%s\n",version); |
| 92 | exit(0); |
| 93 | break; |
| 94 | |
| 95 | case 'v': |
| 96 | message_level|=M_INFO|M_WARNING|M_ERROR|M_FATAL; |
| 97 | break; |
| 98 | |
| 99 | case 'n': |
| 100 | background=False; |
| 101 | break; |
| 102 | |
| 103 | case 'd': |
| 104 | message_level|=M_DEBUG_CONFIG|M_DEBUG_PHASE; |
| 105 | break; |
| 106 | |
| 107 | case 'f': |
| 108 | message_level=M_FATAL; |
| 109 | break; |
| 110 | |
| 111 | case 'c': |
| 112 | if (optarg) |
| 113 | configfile=safe_strdup(optarg,"config_filename"); |
| 114 | else |
| 115 | fatal("secnet: no config filename specified"); |
| 116 | break; |
| 117 | |
| 118 | case 'j': |
| 119 | just_check_config=True; |
| 120 | break; |
| 121 | |
| 122 | case '?': |
| 123 | break; |
| 124 | |
| 125 | default: |
| 126 | Message(M_WARNING,"secnet: Unknown getopt code %c\n",c); |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | if (argc-optind != 0) { |
| 131 | Message(M_WARNING,"secnet: You gave extra command line parameters, " |
| 132 | "which were ignored.\n"); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static void setup(dict_t *config) |
| 137 | { |
| 138 | list_t *l; |
| 139 | item_t *site; |
| 140 | dict_t *system; |
| 141 | struct log_if *log; |
| 142 | struct passwd *pw; |
| 143 | struct cloc loc; |
| 144 | int i; |
| 145 | |
| 146 | l=dict_lookup(config,"system"); |
| 147 | |
| 148 | if (!l || list_elem(l,0)->type!=t_dict) { |
| 149 | fatal("configuration does not include a \"system\" dictionary\n"); |
| 150 | } |
| 151 | system=list_elem(l,0)->data.dict; |
| 152 | loc=list_elem(l,0)->loc; |
| 153 | |
| 154 | /* Arrange systemwide log facility */ |
| 155 | l=dict_lookup(system,"log"); |
| 156 | if (!l) { |
| 157 | fatal("configuration does not include a system/log facility\n"); |
| 158 | } |
| 159 | log=init_log(l); |
| 160 | log->log(log->st,LOG_DEBUG,"%s: logging started",version); |
| 161 | |
| 162 | /* Who are we supposed to run as? */ |
| 163 | userid=dict_read_string(system,"userid",False,"system",loc); |
| 164 | if (userid) { |
| 165 | do { |
| 166 | pw=getpwent(); |
| 167 | if (pw && strcmp(pw->pw_name,userid)==0) { |
| 168 | uid=pw->pw_uid; |
| 169 | break; |
| 170 | } |
| 171 | } while(pw); |
| 172 | endpwent(); |
| 173 | if (uid==0) { |
| 174 | fatal("userid \"%s\" not found\n",userid); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* Pidfile name */ |
| 179 | pidfile=dict_read_string(system,"pidfile",False,"system",loc); |
| 180 | |
| 181 | /* Go along site list, starting sites */ |
| 182 | l=dict_lookup(config,"sites"); |
| 183 | if (!l) { |
| 184 | fatal("configuration did not define any remote sites\n"); |
| 185 | } |
| 186 | i=0; |
| 187 | while ((site=list_elem(l, i++))) { |
| 188 | struct site_if *s; |
| 189 | if (site->type!=t_closure) { |
| 190 | cfgfatal(site->loc,"system","non-closure in site list"); |
| 191 | } |
| 192 | if (site->data.closure->type!=CL_SITE) { |
| 193 | cfgfatal(site->loc,"system","non-site closure in site list"); |
| 194 | } |
| 195 | s=site->data.closure->interface; |
| 196 | s->control(s->st,True); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | void register_for_poll(void *st, beforepoll_fn *before, |
| 201 | afterpoll_fn *after, uint32_t max_nfds, string_t desc) |
| 202 | { |
| 203 | struct poll_interest *i; |
| 204 | |
| 205 | i=safe_malloc(sizeof(*i),"register_for_poll"); |
| 206 | i->before=before; |
| 207 | i->after=after; |
| 208 | i->state=st; |
| 209 | i->max_nfds=max_nfds; |
| 210 | i->nfds=0; |
| 211 | i->desc=desc; |
| 212 | total_nfds+=max_nfds; |
| 213 | i->next=reg; |
| 214 | reg=i; |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | static void system_phase_hook(void *sst, uint32_t newphase) |
| 219 | { |
| 220 | if (newphase==PHASE_SHUTDOWN && pidfile) { |
| 221 | /* Try to unlink the pidfile; don't care if it fails */ |
| 222 | unlink(pidfile); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | static void run(void) |
| 227 | { |
| 228 | struct timeval tv_now; |
| 229 | uint64_t now; |
| 230 | struct poll_interest *i; |
| 231 | int rv, nfds, remain, idx; |
| 232 | int timeout; |
| 233 | struct pollfd *fds; |
| 234 | |
| 235 | fds=alloca(sizeof(*fds)*total_nfds); |
| 236 | if (!fds) { |
| 237 | fatal("run: couldn't alloca\n"); |
| 238 | } |
| 239 | |
| 240 | while (!finished) { |
| 241 | if (gettimeofday(&tv_now, NULL)!=0) { |
| 242 | fatal_perror("main loop: gettimeofday"); |
| 243 | } |
| 244 | now=(tv_now.tv_sec*1000)+(tv_now.tv_usec/1000); |
| 245 | idx=0; |
| 246 | for (i=reg; i; i=i->next) { |
| 247 | i->after(i->state, fds+idx, i->nfds, &tv_now, &now); |
| 248 | idx+=i->nfds; |
| 249 | } |
| 250 | remain=total_nfds; |
| 251 | idx=0; |
| 252 | timeout=-1; |
| 253 | for (i=reg; i; i=i->next) { |
| 254 | nfds=remain; |
| 255 | rv=i->before(i->state, fds+idx, &nfds, &timeout, &tv_now, &now); |
| 256 | if (rv!=0) { |
| 257 | /* XXX we need to handle this properly: increase the |
| 258 | nfds available */ |
| 259 | fatal("run: beforepoll_fn (%s) returns %d\n",i->desc,rv); |
| 260 | } |
| 261 | if (timeout<-1) { |
| 262 | fatal("run: beforepoll_fn (%s) set timeout to %d\n",timeout); |
| 263 | } |
| 264 | idx+=nfds; |
| 265 | remain-=nfds; |
| 266 | i->nfds=nfds; |
| 267 | } |
| 268 | do { |
| 269 | rv=poll(fds, idx, timeout); |
| 270 | if (rv<0) { |
| 271 | if (errno!=EINTR) { |
| 272 | fatal_perror("run: poll"); |
| 273 | } |
| 274 | } |
| 275 | } while (rv<0); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | static void droppriv(void) |
| 280 | { |
| 281 | FILE *pf=NULL; |
| 282 | pid_t p; |
| 283 | |
| 284 | add_hook(PHASE_SHUTDOWN,system_phase_hook,NULL); |
| 285 | |
| 286 | /* Background now, if we're supposed to: we may be unable to write the |
| 287 | pidfile if we don't. */ |
| 288 | if (background) { |
| 289 | printf("goto background\n"); |
| 290 | /* Open the pidfile before forking - that way the parent can tell |
| 291 | whether it succeeds */ |
| 292 | if (pidfile) { |
| 293 | pf=fopen(pidfile,"w"); |
| 294 | if (!pf) { |
| 295 | fatal_perror("cannot open pidfile \"%s\"",pidfile); |
| 296 | } |
| 297 | } else { |
| 298 | Message(M_WARNING,"secnet: no pidfile configured, but " |
| 299 | "backgrounding anyway\n"); |
| 300 | } |
| 301 | p=fork(); |
| 302 | if (p>0) { |
| 303 | if (pf) { |
| 304 | /* Parent process - write pidfile, exit */ |
| 305 | fprintf(pf,"%d\n",p); |
| 306 | fclose(pf); |
| 307 | } |
| 308 | exit(0); |
| 309 | } else if (p==0) { |
| 310 | /* Child process - all done, just carry on */ |
| 311 | if (pf) fclose(pf); |
| 312 | printf("child\n"); |
| 313 | } else { |
| 314 | /* Error */ |
| 315 | fatal_perror("cannot fork"); |
| 316 | exit(1); |
| 317 | } |
| 318 | } else { |
| 319 | if (pidfile) { |
| 320 | pf=fopen(pidfile,"w"); |
| 321 | if (!pf) { |
| 322 | fatal_perror("cannot open pidfile \"%s\"",pidfile); |
| 323 | } |
| 324 | fprintf(pf,"%d\n",getpid()); |
| 325 | fclose(pf); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* Drop privilege now, if configured to do so */ |
| 330 | if (uid!=0) { |
| 331 | if (setuid(uid)!=0) { |
| 332 | fatal_perror("can't set uid to \"%s\"",userid); |
| 333 | } |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | int main(int argc, char **argv) |
| 338 | { |
| 339 | dict_t *config; |
| 340 | |
| 341 | enter_phase(PHASE_GETOPTS); |
| 342 | parse_options(argc,argv); |
| 343 | |
| 344 | enter_phase(PHASE_READCONFIG); |
| 345 | config=read_conffile(configfile); |
| 346 | |
| 347 | enter_phase(PHASE_SETUP); |
| 348 | setup(config); |
| 349 | |
| 350 | if (just_check_config) { |
| 351 | Message(M_INFO,"configuration file check complete\n"); |
| 352 | exit(0); |
| 353 | } |
| 354 | |
| 355 | enter_phase(PHASE_GETRESOURCES); |
| 356 | /* Appropriate phase hooks will have been run */ |
| 357 | |
| 358 | enter_phase(PHASE_DROPPRIV); |
| 359 | droppriv(); |
| 360 | |
| 361 | enter_phase(PHASE_RUN); |
| 362 | run(); |
| 363 | |
| 364 | enter_phase(PHASE_SHUTDOWN); |
| 365 | |
| 366 | return 0; |
| 367 | } |
| 368 | |