citadel/sysdep.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel "system dependent" stuff.
   5  * See COPYING for copyright information.
   6  *
   7  * Here's where we (hopefully) have most parts of the Citadel server that
   8  * would need to be altered to run the server in a non-POSIX environment.
   9  *
  10  * If we ever port to a different platform and either have multiple
  11  * variants of this file or simply load it up with #ifdefs.
  12  *
  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 #include <sys/syslog.h>
  28
  29 #if TIME_WITH_SYS_TIME
  30 # include <sys/time.h>
  31 # include <time.h>
  32 #else
  33 # if HAVE_SYS_TIME_H
  34 #  include <sys/time.h>
  35 # else
  36 #  include <time.h>
  37 # endif
  38 #endif
  39
  40 #include <limits.h>
  41 #include <sys/resource.h>
  42 #include <netinet/in.h>
  43 #include <netinet/tcp.h>
  44 #include <arpa/inet.h>
  45 #include <netdb.h>
  46 #include <sys/un.h>
  47 #include <string.h>
  48 #include <pwd.h>
  49 #include <errno.h>
  50 #include <stdarg.h>
  51 #include <grp.h>
  52 #define SHOW_ME_VAPPEND_PRINTF
  53 #include <libcitadel.h>
  54 #include "citadel.h"
  55 #include "server.h"
  56 #include "sysdep_decls.h"
  57 #include "citserver.h"
  58 #include "support.h"
  59 #include "config.h"
  60 #include "database.h"
  61 #include "housekeeping.h"
  62 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  63 #include "ecrash.h"
  64 #include "context.h"
  65
  66 #ifdef HAVE_SYS_SELECT_H
  67 #include <sys/select.h>
  68 #endif
  69
  70 #ifndef HAVE_SNPRINTF
  71 #include "snprintf.h"
  72 #endif
  73
  74 #include "ctdl_module.h"
  75 #include "threads.h"
  76 #include "user_ops.h"
  77 #include "control.h"
  78
  79
  80 #ifdef DEBUG_MEMORY_LEAKS
  81 struct igheap {
  82         struct igheap *next;
  83         char file[32];
  84         int line;
  85         void *block;
  86 };
  87
  88 struct igheap *igheap = NULL;
  89 #endif
  90
  91
  92 int verbosity = DEFAULT_VERBOSITY;              /* Logging level */
  93
  94 int syslog_facility = LOG_DAEMON;
  95 int enable_syslog = 0;
  96 int print_to_logfile = 1;
  97
  98 /*
  99  * CtdlLogPrintf()  ...   Write logging information
 100  */
 101 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...) {
 102         va_list arg_ptr;
 103         va_start(arg_ptr, format);
 104         vCtdlLogPrintf(loglevel, format, arg_ptr);
 105         va_end(arg_ptr);
 106 }
 107
 108 void vCtdlLogPrintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 109 {
 110
 111         if (enable_syslog) {
 112                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 113         }
 114
 115         /* stderr output code */
 116         if (enable_syslog || !print_to_logfile) return;
 117
 118         /* if we run in forground and syslog is disabled, log to terminal */
 119         if (loglevel <= verbosity) {
 120                 struct timeval tv;
 121                 struct tm tim;
 122                 time_t unixtime;
 123                 StrBuf *lBuf;
 124                 CitContext *CCC = CC;
 125                 ThreadTSD *cTSD = CTP;
 126                 CtdlThreadNode *node = NULL;
 127                 long lwpid = 0;
 128
 129                 if (cTSD != NULL)
 130                         node = cTSD->self;
 131                 if ((node != NULL) && (node->reltid != 0))
 132                 {
 133                         lwpid = node->reltid;
 134                 }
 135
 136                 gettimeofday(&tv, NULL);
 137                 /* Promote to time_t; types differ on some OSes (like darwin) */
 138                 unixtime = tv.tv_sec;
 139                 localtime_r(&unixtime, &tim);
 140
 141                 if ((CCC != NULL) && (CCC != &masterCC))
 142                         lBuf = CCC->lBuf;
 143                 else
 144                         lBuf = NewStrBuf();
 145                 if (lBuf == NULL) {
 146                         char buf[SIZ], buf2[SIZ];
 147
 148                         if ((CCC != NULL) && (CCC->cs_pid != 0)) {
 149                                 sprintf(buf,
 150                                         "%04d/%02d/%02d %2d:%02d:%02d.%06ld xx [%3d] ",
 151                                         tim.tm_year + 1900, tim.tm_mon + 1,
 152                                         tim.tm_mday, tim.tm_hour, tim.tm_min,
 153                                         tim.tm_sec, (long)tv.tv_usec,
 154                                         CCC->cs_pid);
 155                         } else {
 156                                 sprintf(buf,
 157                                         "%04d/%02d/%02d %2d:%02d:%02d.%06ld xx ",
 158                                         tim.tm_year + 1900, tim.tm_mon + 1,
 159                                         tim.tm_mday, tim.tm_hour, tim.tm_min,
 160                                         tim.tm_sec, (long)tv.tv_usec);
 161                         }
 162                         vsnprintf(buf2, SIZ, format, arg_ptr);
 163
 164                         fprintf(stderr, ":%s%s", buf, buf2);
 165                 }
 166                 else {
 167                         StrBufPrintf(lBuf,
 168                                      "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 169                                      tim.tm_year + 1900, tim.tm_mon + 1,
 170                                      tim.tm_mday, tim.tm_hour, tim.tm_min,
 171                                      tim.tm_sec, (long)tv.tv_usec);
 172
 173
 174                         if (lwpid != 0)
 175                                 StrBufAppendPrintf(lBuf,
 176                                                    "[LWP:%d] ",
 177                                                    lwpid);
 178
 179                         if (CCC != NULL) {
 180                                 if (CCC->cs_pid != 0)
 181                                         StrBufAppendPrintf(lBuf,
 182                                                            "[%3d] ",
 183                                                            CCC->cs_pid);
 184                                 else if (CCC->user.usernum != 0)
 185                                         StrBufAppendPrintf(lBuf,
 186                                                            "[:%d] ",
 187                                                            CCC->user.usernum);
 188                         }
 189                         StrBufVAppendPrintf(lBuf, format, arg_ptr);
 190                         fwrite(ChrPtr(lBuf), 1, StrLength(lBuf), stderr);
 191                 }
 192                 fflush(stderr);
 193                 if (CCC == NULL) FreeStrBuf(&lBuf);
 194
 195         }
 196 }
 197
 198
 199
 200 /*
 201  * Signal handler to shut down the server.
 202  */
 203
 204 volatile int exit_signal = 0;
 205 volatile int shutdown_and_halt = 0;
 206 volatile int restart_server = 0;
 207 volatile int running_as_daemon = 0;
 208
 209 static RETSIGTYPE signal_cleanup(int signum) {
 210
 211         if (CT)
 212                 CT->signal = signum;
 213         else
 214         {
 215                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 216                 exit_signal = signum;
 217         }
 218 }
 219
 220 static RETSIGTYPE signal_exit(int signum) {
 221         exit(1);
 222 }
 223
 224
 225
 226 /*
 227  * Some initialization stuff...
 228  */
 229 void init_sysdep(void) {
 230         sigset_t set;
 231
 232         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 233 #ifdef FD_SETSIZE
 234 #ifdef RLIMIT_NOFILE
 235         struct rlimit rl;
 236         getrlimit(RLIMIT_NOFILE, &rl);
 237         rl.rlim_cur = FD_SETSIZE;
 238         rl.rlim_max = FD_SETSIZE;
 239         setrlimit(RLIMIT_NOFILE, &rl);
 240 #endif
 241 #endif
 242
 243         /* If we've got OpenSSL, we're going to use it. */
 244 #ifdef HAVE_OPENSSL
 245         init_ssl();
 246 #endif
 247
 248         /*
 249          * Set up a place to put thread-specific data.
 250          * We only need a single pointer per thread - it points to the
 251          * CitContext structure (in the ContextList linked list) of the
 252          * session to which the calling thread is currently bound.
 253          */
 254         if (citthread_key_create(&MyConKey, NULL) != 0) {
 255                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 256                         strerror(errno));
 257         }
 258
 259         /*
 260          * The action for unexpected signals and exceptions should be to
 261          * call signal_cleanup() to gracefully shut down the server.
 262          */
 263         sigemptyset(&set);
 264         sigaddset(&set, SIGINT);                // intr = shutdown
 265         // sigaddset(&set, SIGQUIT);            // quit = force quit
 266         sigaddset(&set, SIGHUP);
 267         sigaddset(&set, SIGTERM);
 268         // sigaddset(&set, SIGSEGV);            // we want core dumps
 269         // sigaddset(&set, SIGILL);             // we want core dumps
 270         // sigaddset(&set, SIGBUS);
 271         sigprocmask(SIG_UNBLOCK, &set, NULL);
 272
 273         signal(SIGINT, signal_cleanup);         // intr = shutdown
 274         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 275         signal(SIGHUP, signal_cleanup);
 276         signal(SIGTERM, signal_cleanup);
 277         signal(SIGUSR2, signal_exit);
 278         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 279         // signal(SIGILL, signal_cleanup);      // we want core dumps
 280         // signal(SIGBUS, signal_cleanup);
 281
 282         /*
 283          * Do not shut down the server on broken pipe signals, otherwise the
 284          * whole Citadel service would come down whenever a single client
 285          * socket breaks.
 286          */
 287         signal(SIGPIPE, SIG_IGN);
 288 }
 289
 290
 291
 292
 293 /*
 294  * This is a generic function to set up a master socket for listening on
 295  * a TCP port.  The server shuts down if the bind fails.
 296  *
 297  */
 298 int ig_tcp_server(char *ip_addr, int port_number, int queue_len, char **errormessage)
 299 {
 300         struct sockaddr_in sin;
 301         int s, i;
 302         int actual_queue_len;
 303
 304         actual_queue_len = queue_len;
 305         if (actual_queue_len < 5) actual_queue_len = 5;
 306
 307         memset(&sin, 0, sizeof(sin));
 308         sin.sin_family = AF_INET;
 309         sin.sin_port = htons((u_short)port_number);
 310         if (ip_addr == NULL) {
 311                 sin.sin_addr.s_addr = INADDR_ANY;
 312         }
 313         else {
 314                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 315         }
 316
 317         if (sin.sin_addr.s_addr == !INADDR_ANY) {
 318                 sin.sin_addr.s_addr = INADDR_ANY;
 319         }
 320
 321         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 322
 323         if (s < 0) {
 324                 *errormessage = (char*) malloc(SIZ + 1);
 325                 snprintf(*errormessage, SIZ,
 326                                  "citserver: Can't create a socket: %s",
 327                                  strerror(errno));
 328                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 329                 return(-1);
 330         }
 331
 332         i = 1;
 333         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 334
 335         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 336                 *errormessage = (char*) malloc(SIZ + 1);
 337                 snprintf(*errormessage, SIZ,
 338                                  "citserver: Can't bind: %s",
 339                                  strerror(errno));
 340                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 341                 close(s);
 342                 return(-1);
 343         }
 344
 345         /* set to nonblock - we need this for some obscure situations */
 346         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 347                 *errormessage = (char*) malloc(SIZ + 1);
 348                 snprintf(*errormessage, SIZ,
 349                                  "citserver: Can't set socket to non-blocking: %s",
 350                                  strerror(errno));
 351                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 352                 close(s);
 353                 return(-1);
 354         }
 355
 356         if (listen(s, actual_queue_len) < 0) {
 357                 *errormessage = (char*) malloc(SIZ + 1);
 358                 snprintf(*errormessage, SIZ,
 359                                  "citserver: Can't listen: %s",
 360                                  strerror(errno));
 361                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 362                 close(s);
 363                 return(-1);
 364         }
 365
 366         return(s);
 367 }
 368
 369
 370
 371 /*
 372  * Create a Unix domain socket and listen on it
 373  */
 374 int ig_uds_server(char *sockpath, int queue_len, char **errormessage)
 375 {
 376         struct sockaddr_un addr;
 377         int s;
 378         int i;
 379         int actual_queue_len;
 380 #ifdef HAVE_STRUCT_UCRED
 381         int passcred = 1;
 382 #endif
 383
 384         actual_queue_len = queue_len;
 385         if (actual_queue_len < 5) actual_queue_len = 5;
 386
 387         i = unlink(sockpath);
 388         if ((i != 0) && (errno != ENOENT)) {
 389                 *errormessage = (char*) malloc(SIZ + 1);
 390                 snprintf(*errormessage, SIZ, "citserver: can't unlink %s: %s",
 391                         sockpath, strerror(errno));
 392                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 393                 return(-1);
 394         }
 395
 396         memset(&addr, 0, sizeof(addr));
 397         addr.sun_family = AF_UNIX;
 398         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 399
 400         s = socket(AF_UNIX, SOCK_STREAM, 0);
 401         if (s < 0) {
 402                 *errormessage = (char*) malloc(SIZ + 1);
 403                 snprintf(*errormessage, SIZ,
 404                          "citserver: Can't create a socket: %s",
 405                          strerror(errno));
 406                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 407                 return(-1);
 408         }
 409
 410         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 411                 *errormessage = (char*) malloc(SIZ + 1);
 412                 snprintf(*errormessage, SIZ,
 413                          "citserver: Can't bind: %s",
 414                          strerror(errno));
 415                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 416                 return(-1);
 417         }
 418
 419         /* set to nonblock - we need this for some obscure situations */
 420         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 421                 *errormessage = (char*) malloc(SIZ + 1);
 422                 snprintf(*errormessage, SIZ,
 423                          "citserver: Can't set socket to non-blocking: %s",
 424                          strerror(errno));
 425                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 426                 close(s);
 427                 return(-1);
 428         }
 429
 430         if (listen(s, actual_queue_len) < 0) {
 431                 *errormessage = (char*) malloc(SIZ + 1);
 432                 snprintf(*errormessage, SIZ,
 433                          "citserver: Can't listen: %s",
 434                          strerror(errno));
 435                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 436                 return(-1);
 437         }
 438
 439 #ifdef HAVE_STRUCT_UCRED
 440         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 441 #endif
 442
 443         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 444         return(s);
 445 }
 446
 447
 448
 449 /*
 450  * The following functions implement output buffering on operating systems which
 451  * support it (such as Linux and various BSD flavors).
 452  */
 453 #ifndef HAVE_DARWIN
 454 #ifdef TCP_CORK
 455 #       define HAVE_TCP_BUFFERING
 456 #else
 457 #       ifdef TCP_NOPUSH
 458 #               define HAVE_TCP_BUFFERING
 459 #               define TCP_CORK TCP_NOPUSH
 460 #       endif
 461 #endif /* TCP_CORK */
 462 #endif /* HAVE_DARWIN */
 463
 464 static unsigned on = 1, off = 0;
 465
 466 void buffer_output(void) {
 467 #ifdef HAVE_TCP_BUFFERING
 468 #ifdef HAVE_OPENSSL
 469         if (!CC->redirect_ssl)
 470 #endif
 471                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 472 #endif
 473 }
 474
 475 void unbuffer_output(void) {
 476 #ifdef HAVE_TCP_BUFFERING
 477 #ifdef HAVE_OPENSSL
 478         if (!CC->redirect_ssl)
 479 #endif
 480                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 481 #endif
 482 }
 483
 484 void flush_output(void) {
 485 #ifdef HAVE_TCP_BUFFERING
 486         struct CitContext *CCC = CC;
 487         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 488         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 489 #endif
 490 }
 491
 492 /*
 493 static void flush_client_inbuf(void)
 494 {
 495         CitContext *CCC=CC;
 496
 497         FlushStrBuf(CCC->ReadBuf);
 498         CCC->Pos = NULL;
 499
 500 }
 501 */
 502
 503 /*
 504  * client_write()   ...    Send binary data to the client.
 505  */
 506 int client_write(const char *buf, int nbytes)
 507 {
 508         int bytes_written = 0;
 509         int retval;
 510 #ifndef HAVE_TCP_BUFFERING
 511         int old_buffer_len = 0;
 512 #endif
 513         fd_set wset;
 514         CitContext *Ctx;
 515         int fdflags;
 516
 517         if (nbytes < 1) return(0);
 518
 519         Ctx = CC;
 520
 521 #ifdef BIGBAD_IODBG
 522         {
 523                 int rv = 0;
 524                 char fn [SIZ];
 525                 FILE *fd;
 526
 527                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 528
 529                 fd = fopen(fn, "a+");
 530                 fprintf(fd, "Sending: BufSize: %d BufContent: [",
 531                         nbytes);
 532                 rv = fwrite(buf, nbytes, 1, fd);
 533                 fprintf(fd, "]\n");
 534
 535
 536                 fclose(fd);
 537         }
 538 #endif
 539 //      flush_client_inbuf();
 540         if (Ctx->redirect_buffer != NULL) {
 541                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 542                                      buf, nbytes, 0);
 543                 return 0;
 544         }
 545
 546 #ifdef HAVE_OPENSSL
 547         if (Ctx->redirect_ssl) {
 548                 client_write_ssl(buf, nbytes);
 549                 return 0;
 550         }
 551 #endif
 552         if (Ctx->client_socket == -1) return -1;
 553
 554         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 555
 556         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 557                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 558                         FD_ZERO(&wset);
 559                         FD_SET(Ctx->client_socket, &wset);
 560                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 561                                 if (errno == EINTR)
 562                                 {
 563                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 564                                         if (CtdlThreadCheckStop()) {
 565                                                 CC->kill_me = 1;
 566                                                 return (-1);
 567                                         } else {
 568                                                 /* can't trust fd's and stuff so we need to re-create them */
 569                                                 continue;
 570                                         }
 571                                 } else {
 572                                         CtdlLogPrintf(CTDL_ERR,
 573                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 574                                                 nbytes - bytes_written,
 575                                                 strerror(errno), errno);
 576                                         cit_backtrace();
 577                                         Ctx->kill_me = 1;
 578                                         return -1;
 579                                 }
 580                         }
 581                 }
 582
 583                 retval = write(Ctx->client_socket, &buf[bytes_written],
 584                         nbytes - bytes_written);
 585                 if (retval < 1) {
 586                         CtdlLogPrintf(CTDL_ERR,
 587                                 "client_write(%d bytes) failed: %s (%d)\n",
 588                                 nbytes - bytes_written,
 589                                 strerror(errno), errno);
 590                         cit_backtrace();
 591                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 592                         Ctx->kill_me = 1;
 593                         return -1;
 594                 }
 595                 bytes_written = bytes_written + retval;
 596         }
 597         return 0;
 598 }
 599
 600 void cputbuf(const StrBuf *Buf) {
 601         client_write(ChrPtr(Buf), StrLength(Buf));
 602 }
 603
 604
 605 /*
 606  * cprintf()    Send formatted printable data to the client.
 607  *              Implemented in terms of client_write() so it's technically not sysdep...
 608  */
 609 void cprintf(const char *format, ...) {
 610         va_list arg_ptr;
 611         char buf[1024];
 612
 613         va_start(arg_ptr, format);
 614         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 615                 buf[sizeof buf - 2] = '\n';
 616         client_write(buf, strlen(buf));
 617         va_end(arg_ptr);
 618 }
 619
 620
 621 /*
 622  * Read data from the client socket.
 623  *
 624  * sock         socket fd to read from
 625  * buf          buffer to read into
 626  * bytes        number of bytes to read
 627  * timeout      Number of seconds to wait before timing out
 628  *
 629  * Possible return values:
 630  *      1       Requested number of bytes has been read.
 631  *      0       Request timed out.
 632  *      -1      Connection is broken, or other error.
 633  */
 634 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 635 {
 636         CitContext *CCC=CC;
 637         const char *Error;
 638         int retval = 0;
 639
 640 #ifdef HAVE_OPENSSL
 641         if (CCC->redirect_ssl) {
 642                 retval = client_read_sslblob(Target, bytes, timeout);
 643                 if (retval < 0) {
 644                         CtdlLogPrintf(CTDL_CRIT,
 645                                       "%s failed\n",
 646                                       __FUNCTION__);
 647                 }
 648         }
 649         else
 650 #endif
 651         {
 652                 retval = StrBufReadBLOBBuffered(Target,
 653                                                 CCC->ReadBuf,
 654                                                 &CCC->Pos,
 655                                                 &CCC->client_socket,
 656                                                 1,
 657                                                 bytes,
 658                                                 O_TERM,
 659                                                 &Error);
 660                 if (retval < 0) {
 661                         CtdlLogPrintf(CTDL_CRIT,
 662                                       "%s failed: %s\n",
 663                                       __FUNCTION__,
 664                                       Error);
 665                         return retval;
 666                 }
 667                 else
 668                 {
 669 #ifdef BIGBAD_IODBG
 670                         int rv = 0;
 671                         char fn [SIZ];
 672                         FILE *fd;
 673
 674                         snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 675
 676                         fd = fopen(fn, "a+");
 677                         fprintf(fd, "Read: BufSize: %d BufContent: [",
 678                                 StrLength(Target));
 679                         rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 680                         fprintf(fd, "]\n");
 681
 682
 683                         fclose(fd);
 684 #endif
 685
 686                 }
 687         }
 688         return retval;
 689 }
 690
 691
 692 /*
 693  * to make client_read_random_blob() more efficient, increase buffer size.
 694  * just use in greeting function, else your buffer may be flushed
 695  */
 696 void client_set_inbound_buf(long N)
 697 {
 698         FlushStrBuf(CC->ReadBuf);
 699         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 700 }
 701
 702 int client_read_random_blob(StrBuf *Target, int timeout)
 703 {
 704         CitContext *CCC=CC;
 705         int rc;
 706
 707         rc =  client_read_blob(Target, 1, timeout);
 708         if (rc > 0)
 709         {
 710                 long len;
 711                 const char *pch;
 712
 713                 len = StrLength(CCC->ReadBuf);
 714                 pch = ChrPtr(CCC->ReadBuf);
 715
 716                 if (len > 0)
 717                 {
 718                         if (CCC->Pos != NULL) {
 719                                 len -= CCC->Pos - pch;
 720                                 pch = CCC->Pos;
 721                         }
 722                         StrBufAppendBufPlain(Target, pch, len, 0);
 723                         FlushStrBuf(CCC->ReadBuf);
 724                         CCC->Pos = NULL;
 725 #ifdef BIGBAD_IODBG
 726                         {
 727                                 int rv = 0;
 728                                 char fn [SIZ];
 729                                 FILE *fd;
 730
 731                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 732
 733                                 fd = fopen(fn, "a+");
 734                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 735                                         StrLength(Target));
 736                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 737                                 fprintf(fd, "]\n");
 738
 739
 740                                 fclose(fd);
 741                         }
 742 #endif
 743
 744                         return StrLength(Target);
 745                 }
 746                 return rc;
 747         }
 748         else
 749                 return rc;
 750 }
 751
 752 int client_read_to(char *buf, int bytes, int timeout)
 753 {
 754         CitContext *CCC=CC;
 755         int rc;
 756
 757         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 758         if (rc < 0)
 759         {
 760                 *buf = '\0';
 761                 return rc;
 762         }
 763         else
 764         {
 765                 memcpy(buf,
 766                        ChrPtr(CCC->MigrateBuf),
 767                        StrLength(CCC->MigrateBuf) + 1);
 768                 FlushStrBuf(CCC->MigrateBuf);
 769                 return rc;
 770         }
 771 }
 772
 773
 774 int HaveMoreLinesWaiting(CitContext *CCC)
 775 {
 776         if ((CCC->kill_me == 1) || (
 777             (CCC->Pos == NULL) &&
 778             (StrLength(CCC->ReadBuf) == 0) &&
 779             (CCC->client_socket != -1)) )
 780                 return 0;
 781         else
 782                 return 1;
 783 }
 784
 785
 786 /*
 787  * Read data from the client socket with default timeout.
 788  * (This is implemented in terms of client_read_to() and could be
 789  * justifiably moved out of sysdep.c)
 790  */
 791 INLINE int client_read(char *buf, int bytes)
 792 {
 793         return(client_read_to(buf, bytes, config.c_sleeping));
 794 }
 795
 796 int CtdlClientGetLine(StrBuf *Target)
 797 {
 798         CitContext *CCC=CC;
 799         const char *Error;
 800         int rc;
 801
 802         FlushStrBuf(Target);
 803 #ifdef HAVE_OPENSSL
 804         if (CCC->redirect_ssl) {
 805 #ifdef BIGBAD_IODBG
 806                 char fn [SIZ];
 807                 FILE *fd;
 808                 int len = 0;
 809                 int rlen = 0;
 810                 int  nlen = 0;
 811                 int nrlen = 0;
 812                 const char *pch;
 813
 814                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 815
 816                 fd = fopen(fn, "a+");
 817                 pch = ChrPtr(CCC->ReadBuf);
 818                 len = StrLength(CCC->ReadBuf);
 819                 if (CCC->Pos != NULL)
 820                         rlen = CC->Pos - pch;
 821                 else
 822                         rlen = 0;
 823
 824 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 825                         len, rlen, pch);
 826 */
 827                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 828                         len, rlen);
 829 #endif
 830                 rc = client_readline_sslbuffer(Target,
 831                                                CCC->ReadBuf,
 832                                                &CCC->Pos,
 833                                                1);
 834 #ifdef BIGBAD_IODBG
 835                 pch = ChrPtr(CCC->ReadBuf);
 836                 nlen = StrLength(CCC->ReadBuf);
 837                 if (CCC->Pos != NULL)
 838                         nrlen = CC->Pos - pch;
 839                 else
 840                         nrlen = 0;
 841 /*
 842                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 843                         len, nlen, rlen, nrlen, pch);
 844 */
 845                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 846                         len, nlen, rlen, nrlen);
 847
 848                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 849                         StrLength(Target), ChrPtr(Target));
 850                 fclose(fd);
 851
 852                 if (rc < 0)
 853                         CtdlLogPrintf(CTDL_CRIT,
 854                                       "%s failed\n",
 855                                       __FUNCTION__);
 856 #endif
 857                 return rc;
 858         }
 859         else
 860 #endif
 861         {
 862 #ifdef BIGBAD_IODBG
 863                 char fn [SIZ];
 864                 FILE *fd;
 865                 int len, rlen, nlen, nrlen;
 866                 const char *pch;
 867
 868                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 869
 870                 fd = fopen(fn, "a+");
 871                 pch = ChrPtr(CCC->ReadBuf);
 872                 len = StrLength(CCC->ReadBuf);
 873                 if (CCC->Pos != NULL)
 874                         rlen = CC->Pos - pch;
 875                 else
 876                         rlen = 0;
 877
 878 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 879                         len, rlen, pch);
 880 */
 881                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 882                         len, rlen);
 883 #endif
 884                 rc = StrBufTCP_read_buffered_line_fast(Target,
 885                                                        CCC->ReadBuf,
 886                                                        &CCC->Pos,
 887                                                        &CCC->client_socket,
 888                                                        5,
 889                                                        1,
 890                                                        &Error);
 891
 892 #ifdef BIGBAD_IODBG
 893                 pch = ChrPtr(CCC->ReadBuf);
 894                 nlen = StrLength(CCC->ReadBuf);
 895                 if (CCC->Pos != NULL)
 896                         nrlen = CC->Pos - pch;
 897                 else
 898                         nrlen = 0;
 899 /*
 900                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 901                         len, nlen, rlen, nrlen, pch);
 902 */
 903                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 904                         len, nlen, rlen, nrlen);
 905
 906                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 907                         StrLength(Target), ChrPtr(Target));
 908                 fclose(fd);
 909
 910                 if ((rc < 0) && (Error != NULL))
 911                         CtdlLogPrintf(CTDL_CRIT,
 912                                       "%s failed: %s\n",
 913                                       __FUNCTION__,
 914                                       Error);
 915 #endif
 916                 return rc;
 917         }
 918 }
 919
 920
 921 /*
 922  * client_getln()   ...   Get a LF-terminated line of text from the client.
 923  * (This is implemented in terms of client_read() and could be
 924  * justifiably moved out of sysdep.c)
 925  */
 926 int client_getln(char *buf, int bufsize)
 927 {
 928         int i, retval;
 929         CitContext *CCC=CC;
 930         const char *pCh;
 931
 932         retval = CtdlClientGetLine(CCC->MigrateBuf);
 933         if (retval < 0)
 934           return(retval >= 0);
 935
 936
 937         i = StrLength(CCC->MigrateBuf);
 938         pCh = ChrPtr(CCC->MigrateBuf);
 939         /* Strip the trailing LF, and the trailing CR if present.
 940          */
 941         if (bufsize <= i)
 942                 i = bufsize - 1;
 943         while ( (i > 0)
 944                 && ( (pCh[i - 1]==13)
 945                      || ( pCh[i - 1]==10)) ) {
 946                 i--;
 947         }
 948         memcpy(buf, pCh, i);
 949         buf[i] = 0;
 950
 951         FlushStrBuf(CCC->MigrateBuf);
 952         if (retval < 0) {
 953                 safestrncpy(&buf[i], "000", bufsize - i);
 954         }
 955         return(retval >= 0);
 956 }
 957
 958
 959 /*
 960  * Cleanup any contexts that are left lying around
 961  */
 962
 963
 964 void close_masters (void)
 965 {
 966         struct ServiceFunctionHook *serviceptr;
 967
 968         /*
 969          * close all protocol master sockets
 970          */
 971         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 972             serviceptr = serviceptr->next ) {
 973
 974                 if (serviceptr->tcp_port > 0)
 975                 {
 976                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 977                                 serviceptr->tcp_port);
 978                         serviceptr->tcp_port = 0;
 979                 }
 980
 981                 if (serviceptr->sockpath != NULL)
 982                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 983                                 serviceptr->sockpath);
 984
 985                 close(serviceptr->msock);
 986                 /* If it's a Unix domain socket, remove the file. */
 987                 if (serviceptr->sockpath != NULL) {
 988                         unlink(serviceptr->sockpath);
 989                         serviceptr->sockpath = NULL;
 990                 }
 991         }
 992 }
 993
 994
 995 /*
 996  * The system-dependent part of master_cleanup() - close the master socket.
 997  */
 998 void sysdep_master_cleanup(void) {
 999
1000         close_masters();
1001
1002         context_cleanup();
1003
1004 #ifdef HAVE_OPENSSL
1005         destruct_ssl();
1006 #endif
1007         CtdlDestroyProtoHooks();
1008         CtdlDestroyDeleteHooks();
1009         CtdlDestroyXmsgHooks();
1010         CtdlDestroyNetprocHooks();
1011         CtdlDestroyUserHooks();
1012         CtdlDestroyMessageHook();
1013         CtdlDestroyCleanupHooks();
1014         CtdlDestroyFixedOutputHooks();
1015         CtdlDestroySessionHooks();
1016         CtdlDestroyServiceHook();
1017         CtdlDestroyRoomHooks();
1018         #ifdef HAVE_BACKTRACE
1019 ///     eCrash_Uninit();
1020         #endif
1021 }
1022
1023
1024
1025 pid_t current_child;
1026 void graceful_shutdown(int signum) {
1027         kill(current_child, signum);
1028         unlink(file_pid_file);
1029         exit(0);
1030 }
1031
1032 int nFireUps = 0;
1033 int nFireUpsNonRestart = 0;
1034 pid_t ForkedPid = 1;
1035
1036 /*
1037  * Start running as a daemon.
1038  */
1039 void start_daemon(int unused) {
1040         int status = 0;
1041         pid_t child = 0;
1042         FILE *fp;
1043         int do_restart = 0;
1044
1045         current_child = 0;
1046
1047         /* Close stdin/stdout/stderr and replace them with /dev/null.
1048          * We don't just call close() because we don't want these fd's
1049          * to be reused for other files.
1050          */
1051         if (chdir(ctdl_run_dir) != 0)
1052                 CtdlLogPrintf(CTDL_EMERG,
1053                               "unable to change into directory [%s]: %s",
1054                               ctdl_run_dir, strerror(errno));
1055
1056         child = fork();
1057         if (child != 0) {
1058                 exit(0);
1059         }
1060
1061         signal(SIGHUP, SIG_IGN);
1062         signal(SIGINT, SIG_IGN);
1063         signal(SIGQUIT, SIG_IGN);
1064
1065         setsid();
1066         umask(0);
1067         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1068             (freopen("/dev/null", "w", stdout) != stdout) ||
1069             (freopen("/dev/null", "w", stderr) != stderr))
1070                 CtdlLogPrintf(CTDL_EMERG,
1071                               "unable to reopen stdin/out/err %s",
1072                               strerror(errno));
1073
1074
1075         do {
1076                 current_child = fork();
1077
1078                 signal(SIGTERM, graceful_shutdown);
1079
1080                 if (current_child < 0) {
1081                         perror("fork");
1082                         exit(errno);
1083                 }
1084
1085                 else if (current_child == 0) {
1086                         return; /* continue starting citadel. */
1087                 }
1088
1089                 else {
1090                         fp = fopen(file_pid_file, "w");
1091                         if (fp != NULL) {
1092                                 fprintf(fp, ""F_PID_T"\n", getpid());
1093                                 fclose(fp);
1094                         }
1095                         waitpid(current_child, &status, 0);
1096                 }
1097                 do_restart = 0;
1098                 nFireUpsNonRestart = nFireUps;
1099
1100                 /* Exit code 0 means the watcher should exit */
1101                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1102                         do_restart = 0;
1103                 }
1104
1105                 /* Exit code 101-109 means the watcher should exit */
1106                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1107                         do_restart = 0;
1108                 }
1109
1110                 /* Any other exit code, or no exit code, means we should restart. */
1111                 else {
1112                         do_restart = 1;
1113                         nFireUps++;
1114                         ForkedPid = current_child;
1115                 }
1116
1117         } while (do_restart);
1118
1119         unlink(file_pid_file);
1120         exit(WEXITSTATUS(status));
1121 }
1122
1123
1124
1125 void checkcrash(void)
1126 {
1127         if (nFireUpsNonRestart != nFireUps)
1128         {
1129                 StrBuf *CrashMail;
1130
1131                 CrashMail = NewStrBuf();
1132                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
1133                 StrBufPrintf(CrashMail,
1134                         " \n"
1135                         " The Citadel server process (citserver) terminated unexpectedly."
1136                         "\n \n"
1137                         " This could be the result of a bug in the server program, or some external "
1138                         "factor.\n \n"
1139                         " You can obtain more information about this by enabling core dumps.\n \n"
1140                         " For more information, please see:\n \n"
1141                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1142                         "\n \n"
1143
1144                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1145                         ,
1146                         ctdl_run_dir, ForkedPid);
1147                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1148                 FreeStrBuf(&CrashMail);
1149         }
1150 }
1151
1152
1153 /*
1154  * Generic routine to convert a login name to a full name (gecos)
1155  * Returns nonzero if a conversion took place
1156  */
1157 int convert_login(char NameToConvert[]) {
1158         struct passwd *pw;
1159         int a;
1160
1161         pw = getpwnam(NameToConvert);
1162         if (pw == NULL) {
1163                 return(0);
1164         }
1165         else {
1166                 strcpy(NameToConvert, pw->pw_gecos);
1167                 for (a=0; a<strlen(NameToConvert); ++a) {
1168                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1169                 }
1170                 return(1);
1171         }
1172 }
1173
1174
1175
1176 /*
1177  * This loop just keeps going and going and going...
1178  */
1179 /*
1180  * FIXME:
1181  * This current implimentation of worker_thread creates a bottle neck in several situations
1182  * The first thing to remember is that a single thread can handle more than one connection at a time.
1183  * More threads mean less memory for the system to run in.
1184  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1185  * something to happen anywhere.
1186  * This current implimentation requires worker threads to wait in other locations, after it has
1187  * been committed to a single connection which is very wasteful.
1188  * As an extreme case consider this:
1189  * A slow client connects and this slow client sends only one character each second.
1190  * With this current implimentation a single worker thread is dispatched to handle that connection
1191  * until such times as the client timeout expires, an error occurs on the socket or the client
1192  * completes its transmission.
1193  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1194  * second interval between chars.
1195  *
1196  * It is my intention to re-write this code and the associated client_getln, client_read functions
1197  * to allow any thread to read data on behalf of any connection (context).
1198  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1199  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1200  * process it.
1201  * This worker thread loop also needs to be able to handle binary data.
1202  */
1203
1204 void *worker_thread(void *arg) {
1205         int highest;
1206         CitContext *ptr;
1207         CitContext *bind_me = NULL;
1208         fd_set readfds;
1209         int retval = 0;
1210         struct timeval tv;
1211         int force_purge = 0;
1212
1213
1214         while (!CtdlThreadCheckStop()) {
1215
1216                 /* make doubly sure we're not holding any stale db handles
1217                  * which might cause a deadlock.
1218                  */
1219                 cdb_check_handles();
1220 do_select:      force_purge = 0;
1221                 bind_me = NULL;         /* Which session shall we handle? */
1222
1223                 /* Initialize the fdset. */
1224                 FD_ZERO(&readfds);
1225                 highest = 0;
1226
1227                 begin_critical_section(S_SESSION_TABLE);
1228                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1229                         int client_socket;
1230                         client_socket = ptr->client_socket;
1231                         /* Dont select on dead sessions only truly idle ones */
1232                         if ((ptr->state == CON_IDLE) &&
1233                             (CC->kill_me == 0) &&
1234                             (client_socket != -1))
1235                         {
1236                                 FD_SET(client_socket, &readfds);
1237                                 if (client_socket > highest)
1238                                         highest = client_socket;
1239                         }
1240                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1241                                 bind_me = ptr;
1242                                 ptr->state = CON_EXECUTING;
1243                                 break;
1244                         }
1245                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1246                                 bind_me = ptr;
1247                                 ptr->state = CON_STARTING;
1248                                 break;
1249                         }
1250                 }
1251                 end_critical_section(S_SESSION_TABLE);
1252
1253                 if (bind_me) {
1254                         goto SKIP_SELECT;
1255                 }
1256
1257                 /* If we got this far, it means that there are no sessions
1258                  * which a previous thread marked for attention, so we go
1259                  * ahead and get ready to select().
1260                  */
1261
1262                 if (!CtdlThreadCheckStop()) {
1263                         tv.tv_sec = 1;          /* wake up every second if no input */
1264                         tv.tv_usec = 0;
1265                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1266                 }
1267                 else
1268                         return NULL;
1269
1270                 /* Now figure out who made this select() unblock.
1271                  * First, check for an error or exit condition.
1272                  */
1273                 if (retval < 0) {
1274                         if (errno == EBADF) {
1275                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1276                                         strerror(errno));
1277                                 goto do_select;
1278                         }
1279                         if (errno != EINTR) {
1280                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1281                                 CtdlThreadStopAll();
1282                                 continue;
1283                         } else {
1284                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1285                                 if (CtdlThreadCheckStop()) return(NULL);
1286                                 goto do_select;
1287                         }
1288                 }
1289                 else if(retval == 0) {
1290                         if (CtdlThreadCheckStop()) return(NULL);
1291                 }
1292
1293                 /* It must be a client socket.  Find a context that has data
1294                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1295                  * active sockets other than our chosen one are marked as
1296                  * CON_READY so the next thread that comes around can just bind
1297                  * to one without having to select() again.
1298                  */
1299                 begin_critical_section(S_SESSION_TABLE);
1300                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1301                         int checkfd = ptr->client_socket;
1302                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1303                                 if (FD_ISSET(checkfd, &readfds)) {
1304                                         ptr->input_waiting = 1;
1305                                         if (!bind_me) {
1306                                                 bind_me = ptr;  /* I choose you! */
1307                                                 bind_me->state = CON_EXECUTING;
1308                                         }
1309                                         else {
1310                                                 ptr->state = CON_READY;
1311                                         }
1312                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1313                                         if (!bind_me) {
1314                                                 bind_me = ptr;  /* I choose you! */
1315                                                 bind_me->state = CON_EXECUTING;
1316                                         }
1317                                         else {
1318                                                 ptr->state = CON_READY;
1319                                         }
1320                                 }
1321                         }
1322                 }
1323                 end_critical_section(S_SESSION_TABLE);
1324
1325 SKIP_SELECT:
1326                 /* We're bound to a session */
1327                 if (bind_me != NULL) {
1328                         become_session(bind_me);
1329
1330                         if (bind_me->state == CON_STARTING) {
1331                                 bind_me->state = CON_EXECUTING;
1332                                 begin_session(bind_me);
1333                                 bind_me->h_greeting_function();
1334                         }
1335                         /* If the client has sent a command, execute it. */
1336                         if (CC->input_waiting) {
1337                                 CC->h_command_function();
1338
1339                                 while (HaveMoreLinesWaiting(CC))
1340                                        CC->h_command_function();
1341
1342                                 CC->input_waiting = 0;
1343                         }
1344
1345                         /* If there are asynchronous messages waiting and the
1346                          * client supports it, do those now */
1347                         if ((CC->is_async) && (CC->async_waiting)
1348                            && (CC->h_async_function != NULL)) {
1349                                 CC->h_async_function();
1350                                 CC->async_waiting = 0;
1351                         }
1352
1353                         force_purge = CC->kill_me;
1354                         become_session(NULL);
1355                         bind_me->state = CON_IDLE;
1356                 }
1357
1358                 dead_session_purge(force_purge);
1359                 do_housekeeping();
1360         }
1361         /* If control reaches this point, the server is shutting down */
1362         return(NULL);
1363 }
1364
1365
1366
1367
1368 /*
1369  * A function to handle selecting on master sockets.
1370  * In other words it handles new connections.
1371  * It is a thread.
1372  */
1373 void *select_on_master (void *arg)
1374 {
1375         struct ServiceFunctionHook *serviceptr;
1376         fd_set master_fds;
1377         int highest;
1378         struct timeval tv;
1379         int ssock;                      /* Descriptor for client socket */
1380         CitContext *con= NULL;  /* Temporary context pointer */
1381         int m;
1382         int i;
1383         int retval;
1384         struct CitContext select_on_master_CC;
1385
1386         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1387         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1388
1389         while (!CtdlThreadCheckStop()) {
1390                 /* Initialize the fdset. */
1391                 FD_ZERO(&master_fds);
1392                 highest = 0;
1393
1394                 /* First, add the various master sockets to the fdset. */
1395                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1396                 serviceptr = serviceptr->next ) {
1397                         m = serviceptr->msock;
1398                         FD_SET(m, &master_fds);
1399                         if (m > highest) {
1400                                 highest = m;
1401                         }
1402                 }
1403
1404                 if (!CtdlThreadCheckStop()) {
1405                         tv.tv_sec = 60;         /* wake up every second if no input */
1406                         tv.tv_usec = 0;
1407                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1408                 }
1409                 else
1410                         return NULL;
1411
1412                 /* Now figure out who made this select() unblock.
1413                  * First, check for an error or exit condition.
1414                  */
1415                 if (retval < 0) {
1416                         if (errno == EBADF) {
1417                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1418                                         strerror(errno));
1419                                 continue;
1420                         }
1421                         if (errno != EINTR) {
1422                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1423                                 CtdlThreadStopAll();
1424                         } else {
1425                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1426                                 if (CtdlThreadCheckStop()) return(NULL);
1427                                 continue;
1428                         }
1429                 }
1430                 else if(retval == 0) {
1431                         if (CtdlThreadCheckStop()) return(NULL);
1432                         continue;
1433                 }
1434                 /* Next, check to see if it's a new client connecting
1435                  * on a master socket.
1436                  */
1437                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1438                      serviceptr = serviceptr->next ) {
1439
1440                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1441                                 ssock = accept(serviceptr->msock, NULL, 0);
1442                                 if (ssock >= 0) {
1443                                         CtdlLogPrintf(CTDL_DEBUG,
1444                                                 "New client socket %d\n",
1445                                                 ssock);
1446
1447                                         /* The master socket is non-blocking but the client
1448                                          * sockets need to be blocking, otherwise certain
1449                                          * operations barf on FreeBSD.  Not a fatal error.
1450                                          */
1451                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1452                                                 CtdlLogPrintf(CTDL_EMERG,
1453                                                         "citserver: Can't set socket to blocking: %s\n",
1454                                                         strerror(errno));
1455                                         }
1456
1457                                         /* New context will be created already
1458                                          * set up in the CON_EXECUTING state.
1459                                          */
1460                                         con = CreateNewContext();
1461
1462                                         /* Assign our new socket number to it. */
1463                                         con->client_socket = ssock;
1464                                         con->h_command_function =
1465                                                 serviceptr->h_command_function;
1466                                         con->h_async_function =
1467                                                 serviceptr->h_async_function;
1468                                         con->h_greeting_function = serviceptr->h_greeting_function;
1469                                         con->ServiceName =
1470                                                 serviceptr->ServiceName;
1471
1472                                         /* Determine whether it's a local socket */
1473                                         if (serviceptr->sockpath != NULL)
1474                                                 con->is_local_socket = 1;
1475
1476                                         /* Set the SO_REUSEADDR socket option */
1477                                         i = 1;
1478                                         setsockopt(ssock, SOL_SOCKET,
1479                                                 SO_REUSEADDR,
1480                                                 &i, sizeof(i));
1481
1482                                         con->state = CON_GREETING;
1483
1484                                         retval--;
1485                                         if (retval == 0)
1486                                                 break;
1487                                 }
1488                         }
1489                 }
1490         }
1491         CtdlClearSystemContext();
1492
1493         return NULL;
1494 }
1495
1496
1497
1498 /*
1499  * SyslogFacility()
1500  * Translate text facility name to syslog.h defined value.
1501  */
1502 int SyslogFacility(char *name)
1503 {
1504         int i;
1505         struct
1506         {
1507                 int facility;
1508                 char *name;
1509         }   facTbl[] =
1510         {
1511                 {   LOG_KERN,   "kern"          },
1512                 {   LOG_USER,   "user"          },
1513                 {   LOG_MAIL,   "mail"          },
1514                 {   LOG_DAEMON, "daemon"        },
1515                 {   LOG_AUTH,   "auth"          },
1516                 {   LOG_SYSLOG, "syslog"        },
1517                 {   LOG_LPR,    "lpr"           },
1518                 {   LOG_NEWS,   "news"          },
1519                 {   LOG_UUCP,   "uucp"          },
1520                 {   LOG_LOCAL0, "local0"        },
1521                 {   LOG_LOCAL1, "local1"        },
1522                 {   LOG_LOCAL2, "local2"        },
1523                 {   LOG_LOCAL3, "local3"        },
1524                 {   LOG_LOCAL4, "local4"        },
1525                 {   LOG_LOCAL5, "local5"        },
1526                 {   LOG_LOCAL6, "local6"        },
1527                 {   LOG_LOCAL7, "local7"        },
1528                 {   0,            NULL          }
1529         };
1530         for(i = 0; facTbl[i].name != NULL; i++) {
1531                 if(!strcasecmp(name, facTbl[i].name))
1532                         return facTbl[i].facility;
1533         }
1534         enable_syslog = 0;
1535         return LOG_DAEMON;
1536 }
1537
1538
1539 /********** MEM CHEQQER ***********/
1540
1541 #ifdef DEBUG_MEMORY_LEAKS
1542
1543 #undef malloc
1544 #undef realloc
1545 #undef strdup
1546 #undef free
1547
1548 void *tracked_malloc(size_t size, char *file, int line) {
1549         struct igheap *thisheap;
1550         void *block;
1551
1552         block = malloc(size);
1553         if (block == NULL) return(block);
1554
1555         thisheap = malloc(sizeof(struct igheap));
1556         if (thisheap == NULL) {
1557                 free(block);
1558                 return(NULL);
1559         }
1560
1561         thisheap->block = block;
1562         strcpy(thisheap->file, file);
1563         thisheap->line = line;
1564
1565         begin_critical_section(S_DEBUGMEMLEAKS);
1566         thisheap->next = igheap;
1567         igheap = thisheap;
1568         end_critical_section(S_DEBUGMEMLEAKS);
1569
1570         return(block);
1571 }
1572
1573
1574 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1575         struct igheap *thisheap;
1576         void *block;
1577
1578         block = realloc(ptr, size);
1579         if (block == NULL) return(block);
1580
1581         thisheap = malloc(sizeof(struct igheap));
1582         if (thisheap == NULL) {
1583                 free(block);
1584                 return(NULL);
1585         }
1586
1587         thisheap->block = block;
1588         strcpy(thisheap->file, file);
1589         thisheap->line = line;
1590
1591         begin_critical_section(S_DEBUGMEMLEAKS);
1592         thisheap->next = igheap;
1593         igheap = thisheap;
1594         end_critical_section(S_DEBUGMEMLEAKS);
1595
1596         return(block);
1597 }
1598
1599
1600
1601 void tracked_free(void *ptr) {
1602         struct igheap *thisheap;
1603         struct igheap *trash;
1604
1605         free(ptr);
1606
1607         if (igheap == NULL) return;
1608         begin_critical_section(S_DEBUGMEMLEAKS);
1609         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1610                 if (thisheap->next != NULL) {
1611                         if (thisheap->next->block == ptr) {
1612                                 trash = thisheap->next;
1613                                 thisheap->next = thisheap->next->next;
1614                                 free(trash);
1615                         }
1616                 }
1617         }
1618         if (igheap->block == ptr) {
1619                 trash = igheap;
1620                 igheap = igheap->next;
1621                 free(trash);
1622         }
1623         end_critical_section(S_DEBUGMEMLEAKS);
1624 }
1625
1626 char *tracked_strdup(const char *s, char *file, int line) {
1627         char *ptr;
1628
1629         if (s == NULL) return(NULL);
1630         ptr = tracked_malloc(strlen(s) + 1, file, line);
1631         if (ptr == NULL) return(NULL);
1632         strncpy(ptr, s, strlen(s));
1633         return(ptr);
1634 }
1635
1636 void dump_heap(void) {
1637         struct igheap *thisheap;
1638
1639         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1640                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1641                         thisheap->file, thisheap->line);
1642         }
1643 }
1644
1645 #endif /*  DEBUG_MEMORY_LEAKS */