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 "modules_init.h"
  61 #include "ecrash.h"
  62
  63 #ifdef HAVE_SYS_SELECT_H
  64 #include <sys/select.h>
  65 #endif
  66
  67 #ifndef HAVE_SNPRINTF
  68 #include "snprintf.h"
  69 #endif
  70 const char *CitadelServiceUDS="citadel-UDS";
  71 const char *CitadelServiceTCP="citadel-TCP";
  72
  73
  74 extern struct CitContext masterCC;
  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         /* initialise semaphores here. Patch by Matt and davew
 103          * its called here as they are needed by CtdlLogPrintf for thread safety
 104          */
 105         InitialiseSemaphores();
 106
 107         /* initialize the master context */
 108         InitializeMasterCC();
 109
 110         /* parse command-line arguments */
 111         for (a=1; a<argc; ++a) {
 112
 113                 if (!strncmp(argv[a], "-l", 2)) {
 114                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 115                         syslog_facility = SyslogFacility(facility);
 116                         enable_syslog = 1;
 117                 }
 118
 119                 /* run in the background if -d was specified */
 120                 else if (!strcmp(argv[a], "-d")) {
 121                         running_as_daemon = 1;
 122                 }
 123
 124                 /* -x specifies the desired logging level */
 125                 else if (!strncmp(argv[a], "-x", 2)) {
 126                         verbosity = atoi(&argv[a][2]);
 127                 }
 128
 129                 else if (!strncmp(argv[a], "-h", 2)) {
 130                         relh=argv[a][2]!='/';
 131                         if (!relh) safestrncpy(ctdl_home_directory, &argv[a][2],
 132                                                                    sizeof ctdl_home_directory);
 133                         else
 134                                 safestrncpy(relhome, &argv[a][2],
 135                                                         sizeof relhome);
 136                         home=1;
 137                 }
 138
 139                 else if (!strncmp(argv[a], "-t", 2)) {
 140                         freopen(&argv[a][2], "w", stderr);
 141                 }
 142
 143                 else if (!strncmp(argv[a], "-D", 2)) {
 144                         dbg = 1;
 145                 }
 146
 147                 /* -r tells the server not to drop root permissions. don't use
 148                  * this unless you know what you're doing. this should be
 149                  * removed in the next release if it proves unnecessary. */
 150                 else if (!strcmp(argv[a], "-r"))
 151                         drop_root_perms = 0;
 152
 153                 /* any other parameter makes it crash and burn */
 154                 else {
 155                         CtdlLogPrintf(CTDL_EMERG,       "citserver: usage: "
 156                                         "citserver "
 157                                         "[-lLogFacility] "
 158                                         "[-d] [-D] "
 159                                         " [-tTraceFile]"
 160                                         " [-xLogLevel] [-hHomeDir]\n");
 161                         exit(1);
 162                 }
 163
 164         }
 165
 166         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 167         /* daemonize, if we were asked to */
 168         if (running_as_daemon) {
 169                 start_daemon(0);
 170                 drop_root_perms = 1;
 171         }
 172
 173 #ifdef HAVE_BACKTRACE
 174         bzero(&params, sizeof(params));
 175         params.filename = file_pid_paniclog;
 176         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 177         params.filep = fopen(file_pid_paniclog, "a+");
 178         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 179         params.dumpAllThreads = TRUE;
 180         params.useBacktraceSymbols = 1;
 181         params.signals[0]=SIGSEGV;
 182         params.signals[1]=SIGILL;
 183         params.signals[2]=SIGBUS;
 184         params.signals[3]=SIGABRT;
 185         eCrash_Init(&params);
 186         eCrash_RegisterThread("MasterThread", 0);
 187 #endif
 188
 189         /* Initialize the syslogger.  Yes, we are really using 0 as the
 190          * facility, because we are going to bitwise-OR the facility to
 191          * the severity of each message, allowing us to write to other
 192          * facilities when we need to...
 193          */
 194         if (enable_syslog) {
 195                 openlog("citadel", LOG_NDELAY, 0);
 196                 setlogmask(LOG_UPTO(verbosity));
 197         }
 198
 199         /* Tell 'em who's in da house */
 200         CtdlLogPrintf(CTDL_NOTICE, "\n");
 201         CtdlLogPrintf(CTDL_NOTICE, "\n");
 202         CtdlLogPrintf(CTDL_NOTICE,
 203                 "*** Citadel server engine v%d.%02d (build %s) ***\n",
 204                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 205         CtdlLogPrintf(CTDL_NOTICE, "Copyright (C) 1987-2008 by the Citadel development team.\n");
 206         CtdlLogPrintf(CTDL_NOTICE, "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
 217         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 218         CtdlLogPrintf(CTDL_INFO, "Acquiring control record\n");
 219         get_control();
 220
 221         put_config();
 222
 223 #ifdef HAVE_RUN_DIR
 224         /* on some dists rundir gets purged on startup. so we need to recreate it. */
 225
 226         if (stat(ctdl_run_dir, &filestats)==-1){
 227 #ifdef HAVE_GETPWUID_R
 228 #ifdef SOLARIS_GETPWUID
 229                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 230 #else // SOLARIS_GETPWUID
 231                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 232 #endif // SOLARIS_GETPWUID
 233 #else // HAVE_GETPWUID_R
 234                 pwp = NULL;
 235 #endif // HAVE_GETPWUID_R
 236                 mkdir(ctdl_run_dir, 0755);
 237                 chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid);
 238         }
 239
 240
 241 #endif
 242
 243         /* Initialize... */
 244         init_sysdep();
 245
 246         /*
 247          * Do non system dependent startup functions.
 248          */
 249         master_startup();
 250
 251         /*
 252          * Check that the control record is correct and place sensible values if it isn't
 253          */
 254         check_control();
 255
 256         /*
 257          * Run any upgrade entry points
 258          */
 259         CtdlLogPrintf(CTDL_INFO, "Upgrading modules.\n");
 260         upgrade_modules();
 261
 262 /**
 263  * Load the user for the masterCC or create them if they don't exist
 264  */
 265         if (getuser(&masterCC.user, "SYS_Citadel"))
 266         {
 267                 /** User doesn't exist. We can't use create user here as the user number needs to be 0 */
 268                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 269                 putuser(&masterCC.user);
 270                 getuser(&masterCC.user, "SYS_Citadel"); /** Just to be safe */
 271         }
 272
 273         /*
 274          * Bind the server to a Unix-domain socket.
 275          */
 276         CtdlRegisterServiceHook(0,
 277                                 file_citadel_socket,
 278                                 citproto_begin_session,
 279                                 do_command_loop,
 280                                 do_async_loop,
 281                                 CitadelServiceUDS);
 282
 283         /*
 284          * Bind the server to our favorite TCP port (usually 504).
 285          */
 286         CtdlRegisterServiceHook(config.c_port_number,
 287                                 NULL,
 288                                 citproto_begin_session,
 289                                 do_command_loop,
 290                                 do_async_loop,
 291                                 CitadelServiceTCP);
 292
 293
 294
 295
 296         /*
 297          * Load any server-side extensions available here.
 298          */
 299         CtdlLogPrintf(CTDL_INFO, "Initializing server extensions\n");
 300         size = strlen(ctdl_home_directory) + 9;
 301
 302         initialise_modules(0);
 303
 304
 305
 306         /*
 307          * If we need host auth, start our chkpwd daemon.
 308          */
 309         if (config.c_auth_mode == AUTHMODE_HOST) {
 310                 start_chkpwd_daemon();
 311         }
 312
 313
 314         /*
 315          * check, whether we're fired up another time after a crash.
 316          * if, post an aide message, so the admin has a chance to react.
 317          */
 318         checkcrash ();
 319
 320
 321         /*
 322          * Now that we've bound the sockets, change to the Citadel user id and its
 323          * corresponding group ids
 324          */
 325         if (drop_root_perms) {
 326                 cdb_chmod_data();       /* make sure we own our data files */
 327
 328 #ifdef HAVE_GETPWUID_R
 329 #ifdef SOLARIS_GETPWUID
 330                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 331 #else // SOLARIS_GETPWUID
 332                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 333 #endif // SOLARIS_GETPWUID
 334 #else // HAVE_GETPWUID_R
 335                 pwp = NULL;
 336 #endif // HAVE_GETPWUID_R
 337
 338                 if (pwp == NULL)
 339                         CtdlLogPrintf(CTDL_CRIT, "WARNING: getpwuid(%ld): %s\n"
 340                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 341                                 strerror(errno));
 342                 else {
 343                         initgroups(pw.pw_name, pw.pw_gid);
 344                         if (setgid(pw.pw_gid))
 345                                 CtdlLogPrintf(CTDL_CRIT, "setgid(%ld): %s\n", (long)pw.pw_gid,
 346                                         strerror(errno));
 347                 }
 348                 CtdlLogPrintf(CTDL_INFO, "Changing uid to %ld\n", (long)CTDLUID);
 349                 if (setuid(CTDLUID) != 0) {
 350                         CtdlLogPrintf(CTDL_CRIT, "setuid() failed: %s\n", strerror(errno));
 351                 }
 352 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 353                 prctl(PR_SET_DUMPABLE, 1);
 354 #endif
 355         }
 356
 357         /* We want to check for idle sessions once per minute */
 358         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 359
 360         go_threading();
 361
 362
 363         master_cleanup(exit_signal);
 364         return(0);
 365 }