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