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