citadel/server_main.c

   1 /*
   2  * citserver's main() function lives here.
   3  *
   4  * Copyright (c) 1987-2012 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
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <sys/wait.h>
  25 #include <sys/socket.h>
  26 #include <syslog.h>
  27
  28 #if TIME_WITH_SYS_TIME
  29 # include <sys/time.h>
  30 # include <time.h>
  31 #else
  32 # if HAVE_SYS_TIME_H
  33 #  include <sys/time.h>
  34 # else
  35 #  include <time.h>
  36 # endif
  37 #endif
  38
  39 #include <limits.h>
  40 #include <netinet/in.h>
  41 #include <netdb.h>
  42 #include <sys/un.h>
  43 #include <string.h>
  44 #include <pwd.h>
  45 #include <errno.h>
  46 #include <stdarg.h>
  47 #include <grp.h>
  48 #include <pwd.h>
  49 #ifdef HAVE_SYS_PRCTL_H
  50 #include <sys/prctl.h>
  51 #endif
  52 #include <libcitadel.h>
  53 #include "citadel.h"
  54 #include "server.h"
  55 #include "serv_extensions.h"
  56 #include "sysdep_decls.h"
  57 #include "threads.h"
  58 #include "citserver.h"
  59 #include "support.h"
  60 #include "config.h"
  61 #include "control.h"
  62 #include "database.h"
  63 #include "user_ops.h"
  64 #include "housekeeping.h"
  65 #include "svn_revision.h"
  66 #include "citadel_dirs.h"
  67
  68 #include "context.h"
  69
  70 #include "modules_init.h"
  71 #include "ecrash.h"
  72
  73 #ifdef HAVE_SYS_SELECT_H
  74 #include <sys/select.h>
  75 #endif
  76
  77 #ifndef HAVE_SNPRINTF
  78 #include "snprintf.h"
  79 #endif
  80 const char *CitadelServiceUDS="citadel-UDS";
  81 const char *CitadelServiceTCP="citadel-TCP";
  82
  83
  84
  85 void go_threading(void);
  86
  87 /*
  88  * Here's where it all begins.
  89  */
  90 int main(int argc, char **argv)
  91 {
  92         char facility[32];
  93         int a;                  /* General-purpose variables */
  94         struct passwd pw, *pwp = NULL;
  95         char pwbuf[SIZ];
  96         int drop_root_perms = 1;
  97         int relh=0;
  98         int home=0;
  99         int dbg=0;
 100         char relhome[PATH_MAX]="";
 101         char ctdldir[PATH_MAX]=CTDLDIR;
 102         int syslog_facility = LOG_DAEMON;
 103 #ifdef HAVE_RUN_DIR
 104         struct stat filestats;
 105 #endif
 106 #ifdef HAVE_BACKTRACE
 107         eCrashParameters params;
 108 //      eCrashSymbolTable symbol_table;
 109 #endif
 110
 111         /* initialize the master context */
 112         InitializeMasterCC();
 113         InitializeMasterTSD();
 114
 115         /* parse command-line arguments */
 116         for (a=1; a<argc; ++a) {
 117
 118                 if (!strncmp(argv[a], "-l", 2)) {
 119                         safestrncpy(facility, &argv[a][2], sizeof(facility));
 120                         syslog_facility = SyslogFacility(facility);
 121                 }
 122
 123                 /* run in the background if -d was specified */
 124                 else if (!strcmp(argv[a], "-d")) {
 125                         running_as_daemon = 1;
 126                 }
 127
 128                 else if (!strncmp(argv[a], "-h", 2)) {
 129                         relh=argv[a][2]!='/';
 130                         if (!relh) {
 131                                 safestrncpy(ctdl_home_directory, &argv[a][2], sizeof ctdl_home_directory);
 132                         }
 133                         else {
 134                                 safestrncpy(relhome, &argv[a][2], sizeof relhome);
 135                         }
 136                         home=1;
 137                 }
 138
 139                 else if (!strncmp(argv[a], "-x", 2)) {
 140                         /* deprecated */
 141                 }
 142
 143                 else if (!strncmp(argv[a], "-t", 2)) {
 144                         /* deprecated */
 145                 }
 146
 147                 else if (!strncmp(argv[a], "-D", 2)) {
 148                         dbg = 1;
 149                 }
 150
 151                 /* -r tells the server not to drop root permissions. don't use
 152                  * this unless you know what you're doing. this should be
 153                  * removed in the next release if it proves unnecessary. */
 154                 else if (!strcmp(argv[a], "-r")) {
 155                         drop_root_perms = 0;
 156                 }
 157
 158                 /* any other parameter makes it crash and burn */
 159                 else {
 160                         fprintf(stderr, "citserver: usage: "
 161                                         "citserver "
 162                                         "[-lLogFacility] "
 163                                         "[-d] [-D] [-s] "
 164                                         "[-hHomeDir]\n"
 165                         );
 166                         exit(1);
 167                 }
 168
 169         }
 170
 171         openlog("citserver",
 172                 ( running_as_daemon ? (LOG_PID) : (LOG_PID | LOG_PERROR) ),
 173                 syslog_facility
 174         );
 175
 176         calc_dirs_n_files(relh, home, relhome, ctdldir, dbg);
 177         /* daemonize, if we were asked to */
 178         if (running_as_daemon) {
 179                 start_daemon(0);
 180                 drop_root_perms = 1;
 181         }
 182
 183 #ifdef HAVE_BACKTRACE
 184         bzero(&params, sizeof(params));
 185         params.filename = file_pid_paniclog;
 186         panic_fd=open(file_pid_paniclog, O_APPEND|O_CREAT|O_DIRECT);
 187         params.filep = fopen(file_pid_paniclog, "a+");
 188         params.debugLevel = ECRASH_DEBUG_VERBOSE;
 189         params.dumpAllThreads = TRUE;
 190         params.useBacktraceSymbols = 1;
 191         params.signals[0]=SIGSEGV;
 192         params.signals[1]=SIGILL;
 193         params.signals[2]=SIGBUS;
 194         params.signals[3]=SIGABRT;
 195         eCrash_Init(&params);
 196         eCrash_RegisterThread("MasterThread", 0);
 197 #endif
 198
 199         /* Tell 'em who's in da house */
 200         syslog(LOG_NOTICE, " ");
 201         syslog(LOG_NOTICE, " ");
 202         syslog(LOG_NOTICE,
 203                 "*** Citadel server engine v%d.%02d (build %s) ***",
 204                 (REV_LEVEL/100), (REV_LEVEL%100), svn_revision());
 205         syslog(LOG_NOTICE, "Copyright (C) 1987-2012 by the Citadel development team.");
 206         syslog(LOG_NOTICE, "This program is distributed under the terms of the GNU "
 207                                         "General Public License.");
 208         syslog(LOG_NOTICE, " ");
 209         syslog(LOG_DEBUG, "Called as: %s", argv[0]);
 210         syslog(LOG_INFO, "%s", libcitadel_version_string());
 211
 212         /* Load site-specific parameters, and set the ipgm secret */
 213         syslog(LOG_INFO, "Loading citadel.config");
 214         get_config();
 215         config.c_ipgm_secret = rand();
 216
 217         /* get_control() MUST MUST MUST be called BEFORE the databases are opened!! */
 218         syslog(LOG_INFO, "Acquiring control record");
 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
 237                 if ((mkdir(ctdl_run_dir, 0755) != 0) && (errno != EEXIST))
 238                         syslog(LOG_EMERG,
 239                                       "unable to create run directory [%s]: %s",
 240                                       ctdl_run_dir, strerror(errno));
 241
 242                 if (chown(ctdl_run_dir, config.c_ctdluid, (pwp==NULL)?-1:pw.pw_gid) != 0)
 243                         syslog(LOG_EMERG,
 244                                       "unable to set the access rights for [%s]: %s",
 245                                       ctdl_run_dir, strerror(errno));
 246         }
 247
 248
 249 #endif
 250
 251         /* Initialize... */
 252         init_sysdep();
 253
 254         /*
 255          * Do non system dependent startup functions.
 256          */
 257         master_startup();
 258
 259         /*
 260          * Check that the control record is correct and place sensible values if it isn't
 261          */
 262         check_control();
 263
 264         /*
 265          * Run any upgrade entry points
 266          */
 267         syslog(LOG_INFO, "Upgrading modules.");
 268         upgrade_modules();
 269
 270 /*
 271  * Load the user for the masterCC or create them if they don't exist
 272  */
 273         if (CtdlGetUser(&masterCC.user, "SYS_Citadel"))
 274         {
 275                 /* User doesn't exist. We can't use create user here as the user number needs to be 0 */
 276                 strcpy (masterCC.user.fullname, "SYS_Citadel") ;
 277                 CtdlPutUser(&masterCC.user);
 278                 CtdlGetUser(&masterCC.user, "SYS_Citadel"); /* Just to be safe */
 279         }
 280
 281         /*
 282          * Bind the server to a Unix-domain socket.
 283          */
 284         CtdlRegisterServiceHook(0,
 285                                 file_citadel_socket,
 286                                 citproto_begin_session,
 287                                 do_command_loop,
 288                                 do_async_loop,
 289                                 CitadelServiceUDS);
 290
 291         /*
 292          * Bind the server to our favorite TCP port (usually 504).
 293          */
 294         CtdlRegisterServiceHook(config.c_port_number,
 295                                 NULL,
 296                                 citproto_begin_session,
 297                                 do_command_loop,
 298                                 do_async_loop,
 299                                 CitadelServiceTCP);
 300
 301
 302
 303
 304         /*
 305          * Load any server-side extensions available here.
 306          */
 307         syslog(LOG_INFO, "Initializing server extensions");
 308
 309         initialise_modules(0);
 310
 311         /*
 312          * If we need host auth, start our chkpwd daemon.
 313          */
 314         if (config.c_auth_mode == AUTHMODE_HOST) {
 315                 start_chkpwd_daemon();
 316         }
 317
 318
 319         /*
 320          * check, whether we're fired up another time after a crash.
 321          * if, post an aide message, so the admin has a chance to react.
 322          */
 323         checkcrash ();
 324
 325
 326         /*
 327          * Now that we've bound the sockets, change to the Citadel user id and its
 328          * corresponding group ids
 329          */
 330         if (drop_root_perms) {
 331                 cdb_chmod_data();       /* make sure we own our data files */
 332
 333 #ifdef HAVE_GETPWUID_R
 334 #ifdef SOLARIS_GETPWUID
 335                 pwp = getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf));
 336 #else // SOLARIS_GETPWUID
 337                 getpwuid_r(config.c_ctdluid, &pw, pwbuf, sizeof(pwbuf), &pwp);
 338 #endif // SOLARIS_GETPWUID
 339 #else // HAVE_GETPWUID_R
 340                 pwp = NULL;
 341 #endif // HAVE_GETPWUID_R
 342
 343                 if (pwp == NULL)
 344                         syslog(LOG_CRIT, "WARNING: getpwuid(%ld): %s"
 345                                    "Group IDs will be incorrect.\n", (long)CTDLUID,
 346                                 strerror(errno));
 347                 else {
 348                         initgroups(pw.pw_name, pw.pw_gid);
 349                         if (setgid(pw.pw_gid))
 350                                 syslog(LOG_CRIT, "setgid(%ld): %s", (long)pw.pw_gid,
 351                                         strerror(errno));
 352                 }
 353                 syslog(LOG_INFO, "Changing uid to %ld", (long)CTDLUID);
 354                 if (setuid(CTDLUID) != 0) {
 355                         syslog(LOG_CRIT, "setuid() failed: %s", strerror(errno));
 356                 }
 357 #if defined (HAVE_SYS_PRCTL_H) && defined (PR_SET_DUMPABLE)
 358                 prctl(PR_SET_DUMPABLE, 1);
 359 #endif
 360         }
 361
 362         /* We want to check for idle sessions once per minute */
 363         CtdlRegisterSessionHook(terminate_idle_sessions, EVT_TIMER);
 364
 365         go_threading();
 366
 367         master_cleanup(exit_signal);
 368         return(0);
 369 }