citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * Copyright (c) 1987-2015 by the citadel.org team
   5  *
   6  * This program is open source software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 3.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <stdio.h>
  15 #include <sys/types.h>
  16 #include <grp.h>
  17 #include <libcitadel.h>
  18
  19 #include "citserver.h"
  20 #include "svn_revision.h"
  21 #include "modules_init.h"
  22 #include "config.h"
  23 #include "control.h"
  24 #include "serv_extensions.h"
  25 #include "citadel_dirs.h"
  26 #include "user_ops.h"
  27 #include "ecrash.h"
  28
  29 uid_t ctdluid = 0;
  30 const char *CitadelServiceUDS="citadel-UDS";
  31 const char *CitadelServiceTCP="citadel-TCP";
  32
  33
  34
  35 void go_threading(void);
  36
  37 /*
  38  * Here's where it all begins.
  39  */
  40 int main(int argc, char **argv)
  41 {
  42         size_t basesize = 64;
  43         char facility[32];
  44         int a;                  /* General-purpose variables */
  45         struct passwd pw, *pwp = NULL;
  46         char pwbuf[SIZ];
  47         int drop_root_perms = 1;
  48         int relh=0;
  49         int home=0;
  50         int dbg=0;
  51         char relhome[PATH_MAX]="";
  52         char ctdldir[PATH_MAX]=CTDLDIR;
  53         int syslog_facility = LOG_DAEMON;
  54         const char *eDebuglist[] = {NULL, NULL};
  55         uid_t u = 0;
  56         struct passwd *p = NULL;
  57 #ifdef HAVE_RUN_DIR
  58         struct stat filestats;
  59 #endif
  60 #ifdef HAVE_BACKTRACE
  61         eCrashParameters params;
  62 //      eCrashSymbolTable symbol_table;
  63 #endif
  64
  65         /* initialize the master context */
  66         InitializeMasterCC();
  67         InitializeMasterTSD();
  68
  69         /* parse command-line arguments */
  70         while ((a=getopt(argc, argv, "l:dh:x:t:B:Dru:")) != EOF) switch(a) {
  71
  72                 case 'l':
  73                         safestrncpy(facility, optarg, sizeof(facility));
  74                         syslog_facility = SyslogFacility(facility);
  75                         break;
  76
  77                 /* run in the background if -d was specified */
  78                 case 'd':
  79                         running_as_daemon = 1;
  80                         break;
  81
  82                 case 'h':
  83                         relh = optarg[0] != '/';
  84                         if (!relh) {
  85                                 safestrncpy(ctdl_home_directory, optarg, sizeof ctdl_home_directory);
  86                         }
  87                         else {
  88                                 safestrncpy(relhome, optarg, sizeof relhome);
  89                         }
  90                         home=1;
  91                         break;
  92
  93                 case 'x':
  94                         eDebuglist [0] = optarg;
  95                         break;
  96
  97                 case 't':       /* deprecated */
  98                         break;
  99                 case 'B': /* Basesize */
 100                         basesize = atoi(optarg);
 101                         break;
 102
 103                 case 'D':
 104                         dbg = 1;
 105                         break;
 106
 107                 /* -r tells the server not to drop root permissions.
 108                  * Don't use this unless you know what you're doing.
 109                  */
 110                 case 'r':
 111                         drop_root_perms = 0;
 112                         break;
 113
 114                 /* -u tells the server what uid to run under... */
 115                 case 'u':
 116                         u = atoi(optarg);
 117                         if (u > 0) {
 118                                 ctdluid = u;
 119                         }
 120                         else {
 121                                 p = getpwnam(optarg);
 122                                 if (p) {
 123                                         u = p->pw_uid;
 124                                 }
 125                         }
 126                         if (u > 0) {
 127                                 ctdluid = u;
 128                         }
 129                         break;
 130
 131                 default:
 132                 /* any other parameter makes it crash and burn */
 133                         fprintf(stderr, "citserver: usage: "
 134                                         "citserver "
 135                                         "[-l LogFacility] "
 136                                         "[-d] [-D] [-r] "
 137                                         "[-u user] "
 138                                         "[-h HomeDir]\n"
 139                         );
 140                         exit(1);
 141         }
 142
 143         /* Last ditch effort to determine the user name ... if there's a user called "citadel" then use that */
 144         if (ctdluid == 0) {
 145                 p = getpwnam("citadel");
 146                 if (!p) {
 147                         p = getpwnam("bbs");
 148                 }
 149                 if (!p) {
 150                         p = getpwnam("guest");
 151                 }
 152                 if (p) {
 153                         u = p->pw_uid;
 154                 }
 155                 if (u > 0) {
 156                         ctdluid = u;
 157                 }
 158         }
 159
 160         if ((ctdluid == 0) && (drop_root_perms == 0)) {
 161                 fprintf(stderr, "citserver: cannot determine user to run as; please specify -r or -u options\n");
 162                 exit(CTDLEXIT_UNUSER);
 163         }
 164
 165         StartLibCitadel(basesize);
 166         openlog("citserver",
 167                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 168                 syslog_facility
 169         );
 170
 171         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 172         /* daemonize, if we were asked to */
 173         if (running_as_daemon) {
 174                 start_daemon(0);
 175                 drop_root_perms = 1;
 176         }
 177
 178 #if 0
 179  def HAVE_BACKTRACE
 180         bzero(&params, sizeof(params));
 181         params.filename = file_pid_paniclog;
 182         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 183         params.filep = fopen(file_pid_paniclog, "a+");
 184         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 185         params.dumpAllThreads = TRUE;
 186         params.useBacktraceSymbols = 1;
 187         params.signals[0]=SIGSEGV;
 188         params.signals[1]=SIGILL;
 189         params.signals[2]=SIGBUS;
 190         params.signals[3]=SIGABRT;
 191         eCrash_Init(&params);
 192         eCrash_RegisterThread("MasterThread", 0);
 193 #endif
 194
 195         /* Tell 'em who's in da house */
 196         syslog(LOG_NOTICE, " ");
 197         syslog(LOG_NOTICE, " ");
 198         syslog(LOG_NOTICE,
 199                 "*** Citadel server engine v%d.%02d (build %s) ***",
 200                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 201         syslog(LOG_NOTICE, "Copyright (C) 1987-2015 by the Citadel development team.");
 202         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 203                                         "General Public License.");
 204         syslog(LOG_NOTICE, " ");
 205         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 206         syslog(LOG_INFO, "%s", libcitadel_version_string());
 207
 208 #ifdef HAVE_RUN_DIR
 209         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 210
 211         if (stat(ctdl_run_dir, &filestats)==-1){
 212 #ifdef HAVE_GETPWUID_R
 213 #ifdef SOLARIS_GETPWUID
 214                 pwp = getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf));
 215 #else // SOLARIS_GETPWUID
 216                 getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 217 #endif // SOLARIS_GETPWUID
 218 #else // HAVE_GETPWUID_R
 219                 pwp = NULL;
 220 #endif // HAVE_GETPWUID_R
 221
 222                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 223                         syslog(LOG_EMERG,
 224                                       "unable to create run directory [%s]: %s",
 225                                       ctdl_run_dir, strerror(errno));
 226
 227                 if (chown(ctdl_run_dir, ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 228                         syslog(LOG_EMERG,
 229                                       "unable to set the access rights for [%s]: %s",
 230                                       ctdl_run_dir, strerror(errno));
 231         }
 232
 233
 234 #endif
 235
 236         /* Initialize... */
 237         init_sysdep();
 238
 239         /*
 240          * Do non system dependent startup functions.
 241          */
 242         master_startup();
 243
 244         /*
 245          * Check that the control record is correct and place sensible values if it isn't
 246          */
 247         check_control();
 248
 249         /*
 250          * Run any upgrade entry points
 251          */
 252         syslog(LOG_INFO, "Upgrading modules.");
 253         upgrade_modules();
 254
 255 /*
 256  * Load the user for the masterCC or create them if they don't exist
 257  */
 258         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 259         {
 260                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 261                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 262                 CtdlPutUser(&masterCC.user);
 263                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 264         }
 265
 266         /*
 267          * Bind the server to a Unix-domain socket (user client access)
 268          */
 269         CtdlRegisterServiceHook(0,
 270                                 file_citadel_socket,
 271                                 citproto_begin_session,
 272                                 do_command_loop,
 273                                 do_async_loop,
 274                                 CitadelServiceUDS);
 275
 276         /*
 277          * Bind the server to a Unix-domain socket (admin client access)
 278          */
 279         CtdlRegisterServiceHook(0,
 280                                 file_citadel_admin_socket,
 281                                 citproto_begin_admin_session,
 282                                 do_command_loop,
 283                                 do_async_loop,
 284                                 CitadelServiceUDS);
 285         chmod(file_citadel_admin_socket, S_IRWXU);      /* for your eyes only */
 286
 287         /*
 288          * Bind the server to our favorite TCP port (usually 504).
 289          */
 290         CtdlRegisterServiceHook(CtdlGetConfigInt("c_port_number"),
 291                                 NULL,
 292                                 citproto_begin_session,
 293                                 do_command_loop,
 294                                 do_async_loop,
 295                                 CitadelServiceTCP);
 296
 297
 298
 299
 300         /*
 301          * Load any server-side extensions available here.
 302          */
 303         syslog(LOG_INFO, "Initializing server extensions");
 304
 305         initialise_modules(0);
 306
 307         eDebuglist[1] = getenv("CITADEL_LOGDEBUG");
 308         CtdlSetDebugLogFacilities(eDebuglist, 2);
 309
 310         /*
 311          * If we need host auth, start our chkpwd daemon.
 312          */
 313         if (CtdlGetConfigInt("c_auth_mode") == AUTHMODE_HOST) {
 314                 start_chkpwd_daemon();
 315         }
 316
 317
 318         /*
 319          * check, whether we're fired up another time after a crash.
 320          * if, post an aide message, so the admin has a chance to react.
 321          */
 322         checkcrash ();
 323
 324
 325         /*
 326          * Now that we've bound the sockets, change to the Citadel user id and its
 327          * corresponding group ids
 328          */
 329         if (drop_root_perms) {
 330                 cdb_chmod_data();       /* make sure we own our data files */
 331
 332 #ifdef HAVE_GETPWUID_R
 333 #ifdef SOLARIS_GETPWUID
 334                 pwp = getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf));
 335 #else // SOLARIS_GETPWUID
 336                 getpwuid_r(ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 337 #endif // SOLARIS_GETPWUID
 338 #else // HAVE_GETPWUID_R
 339                 pwp = NULL;
 340 #endif // HAVE_GETPWUID_R
 341
 342                 if (pwp == NULL)
 343                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 344                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 345                                 strerror(errno));
 346                 else {
 347                         initgroups(pw.pw_name, pw.pw_gid);
 348                         if (setgid(pw.pw_gid))
 349                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 350                                         strerror(errno));
 351                 }
 352                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 353                 if (setuid(CTDLUID) != 0) {
 354                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 355                 }
 356 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 357                 prctl(PR_SET_DUMPABLE, 1);
 358 #endif
 359         }
 360
 361         /* We want to check for idle sessions once per minute */
 362         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER, PRIO_CLEANUP + 1);
 363
 364         go_threading();
 365
 366         master_cleanup(exit_signal);
 367         return(0);
 368 }