citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * $Id$
   5  */
   6
   7 #include "sysdep.h"
   8 #include <stdlib.h>
   9 #include <unistd.h>
  10 #include <stdio.h>
  11 #include <fcntl.h>
  12 #include <ctype.h>
  13 #include <signal.h>
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <sys/wait.h>
  17 #include <sys/socket.h>
  18 #include <syslog.h>
  19
  20 #if TIME_WITH_SYS_TIME
  21 # include <sys/time.h>
  22 # include <time.h>
  23 #else
  24 # if HAVE_SYS_TIME_H
  25 #  include <sys/time.h>
  26 # else
  27 #  include <time.h>
  28 # endif
  29 #endif
  30
  31 #include <limits.h>
  32 #include <netinet/in.h>
  33 #include <netdb.h>
  34 #include <sys/un.h>
  35 #include <string.h>
  36 #include <pwd.h>
  37 #include <errno.h>
  38 #include <stdarg.h>
  39 #include <grp.h>
  40 #include <pwd.h>
  41 #ifdef HAVE_SYS_PRCTL_H
  42 #include <sys/prctl.h>
  43 #endif
  44 #include <libcitadel.h>
  45 #include "citadel.h"
  46 #include "server.h"
  47 #include "serv_extensions.h"
  48 #include "sysdep_decls.h"
  49 #include "threads.h"
  50 #include "citserver.h"
  51 #include "support.h"
  52 #include "config.h"
  53 #include "control.h"
  54 #include "database.h"
  55 #include "user_ops.h"
  56 #include "housekeeping.h"
  57 #include "svn_revision.h"
  58 #include "citadel_dirs.h"
  59
  60 #include "context.h"
  61
  62 #include "modules_init.h"
  63 #include "ecrash.h"
  64
  65 #ifdef HAVE_SYS_SELECT_H
  66 #include <sys/select.h>
  67 #endif
  68
  69 #ifndef HAVE_SNPRINTF
  70 #include "snprintf.h"
  71 #endif
  72 const char *CitadelServiceUDS="citadel-UDS";
  73 const char *CitadelServiceTCP="citadel-TCP";
  74
  75
  76
  77 void go_threading(void);
  78
  79 /*
  80  * Here's where it all begins.
  81  */
  82 int main(int argc, char **argv)
  83 {
  84         char facility[32];
  85         int a;                  /* General-purpose variables */
  86         struct passwd pw, *pwp = NULL;
  87         char pwbuf[SIZ];
  88         int drop_root_perms = 1;
  89         size_t size;
  90         int relh=0;
  91         int home=0;
  92         int dbg=0;
  93         char relhome[PATH_MAX]="";
  94         char ctdldir[PATH_MAX]=CTDLDIR;
  95 #ifdef HAVE_RUN_DIR
  96         struct stat filestats;
  97 #endif
  98 #ifdef HAVE_BACKTRACE
  99         eCrashParameters params;
 100 //      eCrashSymbolTable symbol_table;
 101 #endif
 102
 103 #ifdef HAVE_GC
 104         GC_INIT();
 105         GC_find_leak = 1;
 106 #endif
 107
 108
 109         /* initialise semaphores here. Patch by Matt and davew
 110          * its called here as they are needed by CtdlLogPrintf for thread safety
 111          */
 112         InitialiseSemaphores();
 113
 114         /* initialize the master context */
 115         InitializeMasterCC();
 116
 117         /* parse command-line arguments */
 118         for (a=1; a<argc; ++a) {
 119
 120                 if (!strncmp(argv[a], "-l", 2)) {
 121                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 122                         syslog_facility = SyslogFacility(facility);
 123                         enable_syslog = 1;
 124                 }
 125
 126                 /* run in the background if -d was specified */
 127                 else if (!strcmp(argv[a], "-d")) {
 128                         running_as_daemon = 1;
 129                 }
 130
 131                 /* run a few stats if -s was specified */
 132                 else if (!strncmp(argv[a], "-s", 2)) {
 133                         statcount = atoi(&argv[a][2]);
 134                 }
 135
 136                 /* -x specifies the desired logging level */
 137                 else if (!strncmp(argv[a], "-x", 2)) {
 138                         verbosity = atoi(&argv[a][2]);
 139                 }
 140
 141                 else if (!strncmp(argv[a], "-h", 2)) {
 142                         relh=argv[a][2]!='/';
 143                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 144                                                                    sizeof ctdl_home_directory);
 145                         else
 146                                 safestrncpy(relhome, &argv[a][2],
 147                                                         sizeof relhome);
 148                         home=1;
 149                 }
 150
 151                 else if (!strncmp(argv[a], "-t", 2)) {
 152                         freopen(&argv[a][2], "w", stderr);
 153                 }
 154
 155                 else if (!strncmp(argv[a], "-D", 2)) {
 156                         dbg = 1;
 157                 }
 158
 159                 /* -r tells the server not to drop root permissions. don't use
 160                  * this unless you know what you're doing. this should be
 161                  * removed in the next release if it proves unnecessary. */
 162                 else if (!strcmp(argv[a], "-r"))
 163                         drop_root_perms = 0;
 164
 165                 /* any other parameter makes it crash and burn */
 166                 else {
 167                         CtdlLogPrintf(CTDL_EMERG,       "citserver: usage: "
 168                                         "citserver "
 169                                         "[-lLogFacility] "
 170                                         "[-d] [-D] [-s]"
 171                                         " [-tTraceFile]"
 172                                         " [-xLogLevel] [-hHomeDir]\n");
 173                         exit(1);
 174                 }
 175
 176         }
 177
 178         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 179         /* daemonize, if we were asked to */
 180         if (running_as_daemon) {
 181                 start_daemon(0);
 182                 drop_root_perms = 1;
 183         }
 184
 185 #ifdef HAVE_BACKTRACE
 186         bzero(&params, sizeof(params));
 187         params.filename = file_pid_paniclog;
 188         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 189         params.filep = fopen(file_pid_paniclog, "a+");
 190         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 191         params.dumpAllThreads = TRUE;
 192         params.useBacktraceSymbols = 1;
 193         params.signals[0]=SIGSEGV;
 194         params.signals[1]=SIGILL;
 195         params.signals[2]=SIGBUS;
 196         params.signals[3]=SIGABRT;
 197         eCrash_Init(&params);
 198         eCrash_RegisterThread("MasterThread", 0);
 199 #endif
 200
 201         /* Initialize the syslogger.  Yes, we are really using 0 as the
 202          * facility, because we are going to bitwise-OR the facility to
 203          * the severity of each message, allowing us to write to other
 204          * facilities when we need to...
 205          */
 206         if (enable_syslog) {
 207                 openlog("citadel", LOG_NDELAY, 0);
 208                 setlogmask(LOG_UPTO(verbosity));
 209         }
 210
 211         /* Tell 'em who's in da house */
 212         CtdlLogPrintf(CTDL_NOTICE, "\n");
 213         CtdlLogPrintf(CTDL_NOTICE, "\n");
 214         CtdlLogPrintf(CTDL_NOTICE,
 215                 "*** Citadel server engine v%d.%02d (build %s) ***\n",
 216                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 217         CtdlLogPrintf(CTDL_NOTICE, "Copyright (C) 1987-2008 by the Citadel development team.\n");
 218         CtdlLogPrintf(CTDL_NOTICE, "This program is distributed under the terms of the GNU "
 219                                         "General Public License.\n");
 220         CtdlLogPrintf(CTDL_NOTICE, "\n");
 221         CtdlLogPrintf(CTDL_DEBUG, "Called as: %s\n", argv[0]);
 222         CtdlLogPrintf(CTDL_INFO, "%s\n", libcitadel_version_string());
 223
 224         /* Load site-specific parameters, and set the ipgm secret */
 225         CtdlLogPrintf(CTDL_INFO, "Loading citadel.config\n");
 226         get_config();
 227         config.c_ipgm_secret = rand();
 228
 229         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 230         CtdlLogPrintf(CTDL_INFO, "Acquiring control record\n");
 231         get_control();
 232
 233         put_config();
 234
 235 #ifdef HAVE_RUN_DIR
 236         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 237
 238         if (stat(ctdl_run_dir, &filestats)==-1){
 239 #ifdef HAVE_GETPWUID_R
 240 #ifdef SOLARIS_GETPWUID
 241                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 242 #else // SOLARIS_GETPWUID
 243                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 244 #endif // SOLARIS_GETPWUID
 245 #else // HAVE_GETPWUID_R
 246                 pwp = NULL;
 247 #endif // HAVE_GETPWUID_R
 248                 mkdir(ctdl_run_dir, 0755);
 249                 chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid);
 250         }
 251
 252
 253 #endif
 254
 255         /* Initialize... */
 256         init_sysdep();
 257
 258         /*
 259          * Do non system dependent startup functions.
 260          */
 261         master_startup();
 262
 263         /*
 264          * Check that the control record is correct and place sensible values if it isn't
 265          */
 266         check_control();
 267
 268         /*
 269          * Run any upgrade entry points
 270          */
 271         CtdlLogPrintf(CTDL_INFO, "Upgrading modules.\n");
 272         upgrade_modules();
 273
 274 /**
 275  * Load the user for the masterCC or create them if they don't exist
 276  */
 277         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 278         {
 279                 /** User doesn't exist. We can't use create user here as the user number needs to be 0 */
 280                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 281                 CtdlPutUser(&masterCC.user);
 282                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /** Just to be safe */
 283         }
 284
 285         /*
 286          * Bind the server to a Unix-domain socket.
 287          */
 288         CtdlRegisterServiceHook(0,
 289                                 file_citadel_socket,
 290                                 citproto_begin_session,
 291                                 do_command_loop,
 292                                 do_async_loop,
 293                                 CitadelServiceUDS);
 294
 295         /*
 296          * Bind the server to our favorite TCP port (usually 504).
 297          */
 298         CtdlRegisterServiceHook(config.c_port_number,
 299                                 NULL,
 300                                 citproto_begin_session,
 301                                 do_command_loop,
 302                                 do_async_loop,
 303                                 CitadelServiceTCP);
 304
 305
 306
 307
 308         /*
 309          * Load any server-side extensions available here.
 310          */
 311         CtdlLogPrintf(CTDL_INFO, "Initializing server extensions\n");
 312         size = strlen(ctdl_home_directory) + 9;
 313
 314         initialise_modules(0);
 315
 316
 317
 318         /*
 319          * If we need host auth, start our chkpwd daemon.
 320          */
 321         if (config.c_auth_mode == AUTHMODE_HOST) {
 322                 start_chkpwd_daemon();
 323         }
 324
 325
 326         /*
 327          * check, whether we're fired up another time after a crash.
 328          * if, post an aide message, so the admin has a chance to react.
 329          */
 330         checkcrash ();
 331
 332
 333         /*
 334          * Now that we've bound the sockets, change to the Citadel user id and its
 335          * corresponding group ids
 336          */
 337         if (drop_root_perms) {
 338                 cdb_chmod_data();       /* make sure we own our data files */
 339
 340 #ifdef HAVE_GETPWUID_R
 341 #ifdef SOLARIS_GETPWUID
 342                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 343 #else // SOLARIS_GETPWUID
 344                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 345 #endif // SOLARIS_GETPWUID
 346 #else // HAVE_GETPWUID_R
 347                 pwp = NULL;
 348 #endif // HAVE_GETPWUID_R
 349
 350                 if (pwp == NULL)
 351                         CtdlLogPrintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 352                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 353                                 strerror(errno));
 354                 else {
 355                         initgroups(pw.pw_name, pw.pw_gid);
 356                         if (setgid(pw.pw_gid))
 357                                 CtdlLogPrintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 358                                         strerror(errno));
 359                 }
 360                 CtdlLogPrintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 361                 if (setuid(CTDLUID) != 0) {
 362                         CtdlLogPrintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 363                 }
 364 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 365                 prctl(PR_SET_DUMPABLE, 1);
 366 #endif
 367         }
 368
 369         /* We want to check for idle sessions once per minute */
 370         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 371
 372         go_threading();
 373
 374
 375         master_cleanup(exit_signal);
 376         return(0);
 377 }