citadel/sysdep.c

   1 /*
   2  * Citadel "system dependent" stuff.
   3  *
   4  * Here's where we (hopefully) have most parts of the Citadel server that
   5  * would need to be altered to run the server in a non-POSIX environment.
   6  *
   7  * If we ever port to a different platform and either have multiple
   8  * variants of this file or simply load it up with #ifdefs.
   9  *
  10  * Copyright (c) 1987-2011 by the citadel.org team
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 3 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include "sysdep.h"
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <fcntl.h>
  32 #include <ctype.h>
  33 #include <signal.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <sys/wait.h>
  37 #include <sys/socket.h>
  38 #include <syslog.h>
  39 #include <sys/syslog.h>
  40
  41 #if TIME_WITH_SYS_TIME
  42 # include <sys/time.h>
  43 # include <time.h>
  44 #else
  45 # if HAVE_SYS_TIME_H
  46 #  include <sys/time.h>
  47 # else
  48 #  include <time.h>
  49 # endif
  50 #endif
  51
  52 #include <limits.h>
  53 #include <sys/resource.h>
  54 #include <netinet/in.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57 #include <netdb.h>
  58 #include <sys/un.h>
  59 #include <string.h>
  60 #include <pwd.h>
  61 #include <errno.h>
  62 #include <stdarg.h>
  63 #include <grp.h>
  64 #define SHOW_ME_VAPPEND_PRINTF
  65 #include <libcitadel.h>
  66 #include "citadel.h"
  67 #include "server.h"
  68 #include "sysdep_decls.h"
  69 #include "citserver.h"
  70 #include "support.h"
  71 #include "config.h"
  72 #include "database.h"
  73 #include "housekeeping.h"
  74 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  75 #include "ecrash.h"
  76 #include "context.h"
  77
  78 #ifdef HAVE_SYS_SELECT_H
  79 #include <sys/select.h>
  80 #endif
  81
  82 #ifndef HAVE_SNPRINTF
  83 #include "snprintf.h"
  84 #endif
  85
  86 #include "ctdl_module.h"
  87 #include "threads.h"
  88 #include "user_ops.h"
  89 #include "control.h"
  90
  91
  92 #ifdef DEBUG_MEMORY_LEAKS
  93 struct igheap {
  94         struct igheap *next;
  95         char file[32];
  96         int line;
  97         void *block;
  98 };
  99
 100 struct igheap *igheap = NULL;
 101 #endif
 102
 103
 104 /*
 105  * Signal handler to shut down the server.
 106  */
 107
 108 volatile int exit_signal = 0;
 109 volatile int shutdown_and_halt = 0;
 110 volatile int restart_server = 0;
 111 volatile int running_as_daemon = 0;
 112
 113 static RETSIGTYPE signal_cleanup(int signum) {
 114
 115         if (CT)
 116                 CT->signal = signum;
 117         else
 118         {
 119                 syslog(LOG_DEBUG, "Caught signal %d; shutting down.\n", signum);
 120                 exit_signal = signum;
 121         }
 122 }
 123
 124 static RETSIGTYPE signal_exit(int signum) {
 125         exit(1);
 126 }
 127
 128
 129
 130 /*
 131  * Some initialization stuff...
 132  */
 133 void init_sysdep(void) {
 134         sigset_t set;
 135
 136         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 137 #ifdef FD_SETSIZE
 138 #ifdef RLIMIT_NOFILE
 139         struct rlimit rl;
 140         getrlimit(RLIMIT_NOFILE, &rl);
 141         rl.rlim_cur = FD_SETSIZE;
 142         rl.rlim_max = FD_SETSIZE;
 143         setrlimit(RLIMIT_NOFILE, &rl);
 144 #endif
 145 #endif
 146
 147         /* If we've got OpenSSL, we're going to use it. */
 148 #ifdef HAVE_OPENSSL
 149         init_ssl();
 150 #endif
 151
 152         /*
 153          * Set up a place to put thread-specific data.
 154          * We only need a single pointer per thread - it points to the
 155          * CitContext structure (in the ContextList linked list) of the
 156          * session to which the calling thread is currently bound.
 157          */
 158         if (citthread_key_create(&MyConKey, NULL) != 0) {
 159                 syslog(LOG_CRIT, "Can't create TSD key: %s\n",
 160                         strerror(errno));
 161         }
 162
 163         /*
 164          * The action for unexpected signals and exceptions should be to
 165          * call signal_cleanup() to gracefully shut down the server.
 166          */
 167         sigemptyset(&set);
 168         sigaddset(&set, SIGINT);                // intr = shutdown
 169         // sigaddset(&set, SIGQUIT);            // quit = force quit
 170         sigaddset(&set, SIGHUP);
 171         sigaddset(&set, SIGTERM);
 172         // sigaddset(&set, SIGSEGV);            // we want core dumps
 173         // sigaddset(&set, SIGILL);             // we want core dumps
 174         // sigaddset(&set, SIGBUS);
 175         sigprocmask(SIG_UNBLOCK, &set, NULL);
 176
 177         signal(SIGINT, signal_cleanup);         // intr = shutdown
 178         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 179         signal(SIGHUP, signal_cleanup);
 180         signal(SIGTERM, signal_cleanup);
 181         signal(SIGUSR2, signal_exit);
 182         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 183         // signal(SIGILL, signal_cleanup);      // we want core dumps
 184         // signal(SIGBUS, signal_cleanup);
 185
 186         /*
 187          * Do not shut down the server on broken pipe signals, otherwise the
 188          * whole Citadel service would come down whenever a single client
 189          * socket breaks.
 190          */
 191         signal(SIGPIPE, SIG_IGN);
 192 }
 193
 194
 195 /*
 196  * This is a generic function to set up a master socket for listening on
 197  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 198  *
 199  * ip_addr      IP address to bind
 200  * port_number  port number to bind
 201  * queue_len    number of incoming connections to allow in the queue
 202  */
 203 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 204 {
 205         struct protoent *p;
 206         struct sockaddr_in6 sin6;
 207         struct sockaddr_in sin4;
 208         int s, i, b;
 209         int ip_version = 6;
 210
 211         memset(&sin6, 0, sizeof(sin6));
 212         memset(&sin4, 0, sizeof(sin4));
 213         sin6.sin6_family = AF_INET6;
 214         sin4.sin_family = AF_INET;
 215
 216         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 217                 || (IsEmptyStr(ip_addr))
 218                 || (!strcmp(ip_addr, "*"))
 219         ) {
 220                 ip_version = 6;
 221                 sin6.sin6_addr = in6addr_any;
 222         }
 223         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 224         {
 225                 ip_version = 4;
 226                 sin4.sin_addr.s_addr = INADDR_ANY;
 227         }
 228         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 229         {
 230                 ip_version = 4;
 231                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 232                         snprintf(errormessage, SIZ,
 233                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 234                         );
 235                         syslog(LOG_ALERT, "%s\n", errormessage);
 236                         return (-1);
 237                 }
 238         }
 239         else                                                                            /* specific IPv6 */
 240         {
 241                 ip_version = 6;
 242                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 243                         snprintf(errormessage, SIZ,
 244                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 245                         );
 246                         syslog(LOG_ALERT, "%s\n", errormessage);
 247                         return (-1);
 248                 }
 249         }
 250
 251         if (port_number == 0) {
 252                 snprintf(errormessage, SIZ,
 253                          "Can't start: no port number specified."
 254                 );
 255                 syslog(LOG_ALERT, "%s\n", errormessage);
 256                 return (-1);
 257         }
 258         sin6.sin6_port = htons((u_short) port_number);
 259         sin4.sin_port = htons((u_short) port_number);
 260
 261         p = getprotobyname("tcp");
 262
 263         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 264         if (s < 0) {
 265                 snprintf(errormessage, SIZ,
 266                          "Can't create a listening socket: %s", strerror(errno)
 267                 );
 268                 syslog(LOG_ALERT, "%s\n", errormessage);
 269                 return (-1);
 270         }
 271         /* Set some socket options that make sense. */
 272         i = 1;
 273         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 274
 275         if (ip_version == 6) {
 276                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 277         }
 278         else {
 279                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 280         }
 281
 282         if (b < 0) {
 283                 snprintf(errormessage, SIZ,
 284                          "Can't bind: %s", strerror(errno)
 285                 );
 286                 syslog(LOG_ALERT, "%s\n", errormessage);
 287                 return (-1);
 288         }
 289
 290         fcntl(s, F_SETFL, O_NONBLOCK);
 291
 292         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 293                 snprintf(errormessage, SIZ,
 294                          "Can't listen: %s", strerror(errno)
 295                 );
 296                 syslog(LOG_ALERT, "%s\n", errormessage);
 297                 return (-1);
 298         }
 299         return (s);
 300 }
 301
 302
 303
 304
 305
 306 /*
 307  * Create a Unix domain socket and listen on it
 308  */
 309 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 310 {
 311         struct sockaddr_un addr;
 312         int s;
 313         int i;
 314         int actual_queue_len;
 315 #ifdef HAVE_STRUCT_UCRED
 316         int passcred = 1;
 317 #endif
 318
 319         actual_queue_len = queue_len;
 320         if (actual_queue_len < 5) actual_queue_len = 5;
 321
 322         i = unlink(sockpath);
 323         if ((i != 0) && (errno != ENOENT)) {
 324                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 325                         sockpath, strerror(errno)
 326                 );
 327                 syslog(LOG_EMERG, "%s\n", errormessage);
 328                 return(-1);
 329         }
 330
 331         memset(&addr, 0, sizeof(addr));
 332         addr.sun_family = AF_UNIX;
 333         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 334
 335         s = socket(AF_UNIX, SOCK_STREAM, 0);
 336         if (s < 0) {
 337                 snprintf(errormessage, SIZ,
 338                          "citserver: Can't create a socket: %s",
 339                          strerror(errno));
 340                 syslog(LOG_EMERG, "%s\n", errormessage);
 341                 return(-1);
 342         }
 343
 344         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 345                 snprintf(errormessage, SIZ,
 346                          "citserver: Can't bind: %s",
 347                          strerror(errno));
 348                 syslog(LOG_EMERG, "%s\n", errormessage);
 349                 return(-1);
 350         }
 351
 352         /* set to nonblock - we need this for some obscure situations */
 353         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 354                 snprintf(errormessage, SIZ,
 355                          "citserver: Can't set socket to non-blocking: %s",
 356                          strerror(errno));
 357                 syslog(LOG_EMERG, "%s\n", errormessage);
 358                 close(s);
 359                 return(-1);
 360         }
 361
 362         if (listen(s, actual_queue_len) < 0) {
 363                 snprintf(errormessage, SIZ,
 364                          "citserver: Can't listen: %s",
 365                          strerror(errno));
 366                 syslog(LOG_EMERG, "%s\n", errormessage);
 367                 return(-1);
 368         }
 369
 370 #ifdef HAVE_STRUCT_UCRED
 371         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 372 #endif
 373
 374         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 375         return(s);
 376 }
 377
 378
 379
 380 /*
 381  * The following functions implement output buffering on operating systems which
 382  * support it (such as Linux and various BSD flavors).
 383  */
 384 #ifndef HAVE_DARWIN
 385 #ifdef TCP_CORK
 386 #       define HAVE_TCP_BUFFERING
 387 #else
 388 #       ifdef TCP_NOPUSH
 389 #               define HAVE_TCP_BUFFERING
 390 #               define TCP_CORK TCP_NOPUSH
 391 #       endif
 392 #endif /* TCP_CORK */
 393 #endif /* HAVE_DARWIN */
 394
 395 static unsigned on = 1, off = 0;
 396
 397 void buffer_output(void) {
 398 #ifdef HAVE_TCP_BUFFERING
 399 #ifdef HAVE_OPENSSL
 400         if (!CC->redirect_ssl)
 401 #endif
 402                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 403 #endif
 404 }
 405
 406 void unbuffer_output(void) {
 407 #ifdef HAVE_TCP_BUFFERING
 408 #ifdef HAVE_OPENSSL
 409         if (!CC->redirect_ssl)
 410 #endif
 411                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 412 #endif
 413 }
 414
 415 void flush_output(void) {
 416 #ifdef HAVE_TCP_BUFFERING
 417         struct CitContext *CCC = CC;
 418         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 419         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 420 #endif
 421 }
 422
 423 /*
 424 static void flush_client_inbuf(void)
 425 {
 426         CitContext *CCC=CC;
 427
 428         FlushStrBuf(CCC->ReadBuf);
 429         CCC->Pos = NULL;
 430
 431 }
 432 */
 433
 434 /*
 435  * client_write()   ...    Send binary data to the client.
 436  */
 437 int client_write(const char *buf, int nbytes)
 438 {
 439         int bytes_written = 0;
 440         int retval;
 441 #ifndef HAVE_TCP_BUFFERING
 442         int old_buffer_len = 0;
 443 #endif
 444         fd_set wset;
 445         CitContext *Ctx;
 446         int fdflags;
 447
 448         if (nbytes < 1) return(0);
 449
 450         Ctx = CC;
 451
 452 #ifdef BIGBAD_IODBG
 453         {
 454                 int rv = 0;
 455                 char fn [SIZ];
 456                 FILE *fd;
 457
 458                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 459
 460                 fd = fopen(fn, "a+");
 461                 fprintf(fd, "Sending: BufSize: %d BufContent: [",
 462                         nbytes);
 463                 rv = fwrite(buf, nbytes, 1, fd);
 464                 fprintf(fd, "]\n");
 465
 466
 467                 fclose(fd);
 468         }
 469 #endif
 470 //      flush_client_inbuf();
 471         if (Ctx->redirect_buffer != NULL) {
 472                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 473                                      buf, nbytes, 0);
 474                 return 0;
 475         }
 476
 477 #ifdef HAVE_OPENSSL
 478         if (Ctx->redirect_ssl) {
 479                 client_write_ssl(buf, nbytes);
 480                 return 0;
 481         }
 482 #endif
 483         if (Ctx->client_socket == -1) return -1;
 484
 485         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 486
 487         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 488                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 489                         FD_ZERO(&wset);
 490                         FD_SET(Ctx->client_socket, &wset);
 491                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 492                                 if (errno == EINTR)
 493                                 {
 494                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 495                                         if (CtdlThreadCheckStop()) {
 496                                                 CC->kill_me = 1;
 497                                                 return (-1);
 498                                         } else {
 499                                                 /* can't trust fd's and stuff so we need to re-create them */
 500                                                 continue;
 501                                         }
 502                                 } else {
 503                                         syslog(LOG_ERR,
 504                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 505                                                 nbytes - bytes_written,
 506                                                 strerror(errno), errno);
 507                                         cit_backtrace();
 508                                         Ctx->kill_me = 1;
 509                                         return -1;
 510                                 }
 511                         }
 512                 }
 513
 514                 retval = write(Ctx->client_socket, &buf[bytes_written],
 515                         nbytes - bytes_written);
 516                 if (retval < 1) {
 517                         syslog(LOG_ERR,
 518                                 "client_write(%d bytes) failed: %s (%d)\n",
 519                                 nbytes - bytes_written,
 520                                 strerror(errno), errno);
 521                         cit_backtrace();
 522                         // syslog(LOG_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 523                         Ctx->kill_me = 1;
 524                         return -1;
 525                 }
 526                 bytes_written = bytes_written + retval;
 527         }
 528         return 0;
 529 }
 530
 531 void cputbuf(const StrBuf *Buf) {
 532         client_write(ChrPtr(Buf), StrLength(Buf));
 533 }
 534
 535
 536 /*
 537  * cprintf()    Send formatted printable data to the client.
 538  *              Implemented in terms of client_write() so it's technically not sysdep...
 539  */
 540 void cprintf(const char *format, ...) {
 541         va_list arg_ptr;
 542         char buf[1024];
 543
 544         va_start(arg_ptr, format);
 545         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 546                 buf[sizeof buf - 2] = '\n';
 547         client_write(buf, strlen(buf));
 548         va_end(arg_ptr);
 549 }
 550
 551
 552 /*
 553  * Read data from the client socket.
 554  *
 555  * sock         socket fd to read from
 556  * buf          buffer to read into
 557  * bytes        number of bytes to read
 558  * timeout      Number of seconds to wait before timing out
 559  *
 560  * Possible return values:
 561  *      1       Requested number of bytes has been read.
 562  *      0       Request timed out.
 563  *      -1      Connection is broken, or other error.
 564  */
 565 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 566 {
 567         CitContext *CCC=CC;
 568         const char *Error;
 569         int retval = 0;
 570
 571 #ifdef HAVE_OPENSSL
 572         if (CCC->redirect_ssl) {
 573 #ifdef BIGBAD_IODBG
 574                 int rv = 0;
 575                 char fn [SIZ];
 576                 FILE *fd;
 577
 578                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 579
 580                 fd = fopen(fn, "a+");
 581                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 582                         bytes);
 583                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 584                 fprintf(fd, "]\n");
 585
 586
 587                 fclose(fd);
 588 #endif
 589                 retval = client_read_sslblob(Target, bytes, timeout);
 590                 if (retval < 0) {
 591                         syslog(LOG_CRIT,
 592                                       "%s failed\n",
 593                                       __FUNCTION__);
 594                 }
 595 #ifdef BIGBAD_IODBG
 596                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 597
 598                 fd = fopen(fn, "a+");
 599                 fprintf(fd, "Read: %d BufContent: [",
 600                         StrLength(Target));
 601                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 602                 fprintf(fd, "]\n");
 603
 604
 605                 fclose(fd);
 606 #endif
 607         }
 608         else
 609 #endif
 610         {
 611 #ifdef BIGBAD_IODBG
 612                 int rv = 0;
 613                 char fn [SIZ];
 614                 FILE *fd;
 615
 616                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 617
 618                 fd = fopen(fn, "a+");
 619                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 620                         bytes);
 621                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 622                 fprintf(fd, "]\n");
 623
 624
 625                 fclose(fd);
 626 #endif
 627                 retval = StrBufReadBLOBBuffered(Target,
 628                                                 CCC->ReadBuf,
 629                                                 &CCC->Pos,
 630                                                 &CCC->client_socket,
 631                                                 1,
 632                                                 bytes,
 633                                                 O_TERM,
 634                                                 &Error);
 635                 if (retval < 0) {
 636                         syslog(LOG_CRIT,
 637                                       "%s failed: %s\n",
 638                                       __FUNCTION__,
 639                                       Error);
 640                         return retval;
 641                 }
 642 #ifdef BIGBAD_IODBG
 643                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 644
 645                 fd = fopen(fn, "a+");
 646                 fprintf(fd, "Read: %d BufContent: [",
 647                         StrLength(Target));
 648                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 649                 fprintf(fd, "]\n");
 650
 651
 652                 fclose(fd);
 653 #endif
 654         }
 655         return retval;
 656 }
 657
 658
 659 /*
 660  * to make client_read_random_blob() more efficient, increase buffer size.
 661  * just use in greeting function, else your buffer may be flushed
 662  */
 663 void client_set_inbound_buf(long N)
 664 {
 665         FlushStrBuf(CC->ReadBuf);
 666         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 667 }
 668
 669 int client_read_random_blob(StrBuf *Target, int timeout)
 670 {
 671         CitContext *CCC=CC;
 672         int rc;
 673
 674         rc =  client_read_blob(Target, 1, timeout);
 675         if (rc > 0)
 676         {
 677                 long len;
 678                 const char *pch;
 679
 680                 len = StrLength(CCC->ReadBuf);
 681                 pch = ChrPtr(CCC->ReadBuf);
 682
 683                 if (len > 0)
 684                 {
 685                         if (CCC->Pos != NULL) {
 686                                 len -= CCC->Pos - pch;
 687                                 pch = CCC->Pos;
 688                         }
 689                         StrBufAppendBufPlain(Target, pch, len, 0);
 690                         FlushStrBuf(CCC->ReadBuf);
 691                         CCC->Pos = NULL;
 692 #ifdef BIGBAD_IODBG
 693                         {
 694                                 int rv = 0;
 695                                 char fn [SIZ];
 696                                 FILE *fd;
 697
 698                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 699
 700                                 fd = fopen(fn, "a+");
 701                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 702                                         StrLength(Target));
 703                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 704                                 fprintf(fd, "]\n");
 705
 706
 707                                 fclose(fd);
 708                         }
 709 #endif
 710
 711                         return StrLength(Target);
 712                 }
 713                 return rc;
 714         }
 715         else
 716                 return rc;
 717 }
 718
 719 int client_read_to(char *buf, int bytes, int timeout)
 720 {
 721         CitContext *CCC=CC;
 722         int rc;
 723
 724         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 725         if (rc < 0)
 726         {
 727                 *buf = '\0';
 728                 return rc;
 729         }
 730         else
 731         {
 732                 memcpy(buf,
 733                        ChrPtr(CCC->MigrateBuf),
 734                        StrLength(CCC->MigrateBuf) + 1);
 735                 FlushStrBuf(CCC->MigrateBuf);
 736                 return rc;
 737         }
 738 }
 739
 740
 741 int HaveMoreLinesWaiting(CitContext *CCC)
 742 {
 743         if ((CCC->kill_me == 1) || (
 744             (CCC->Pos == NULL) &&
 745             (StrLength(CCC->ReadBuf) == 0) &&
 746             (CCC->client_socket != -1)) )
 747                 return 0;
 748         else
 749                 return 1;
 750 }
 751
 752
 753 /*
 754  * Read data from the client socket with default timeout.
 755  * (This is implemented in terms of client_read_to() and could be
 756  * justifiably moved out of sysdep.c)
 757  */
 758 INLINE int client_read(char *buf, int bytes)
 759 {
 760         return(client_read_to(buf, bytes, config.c_sleeping));
 761 }
 762
 763 int CtdlClientGetLine(StrBuf *Target)
 764 {
 765         CitContext *CCC=CC;
 766         const char *Error;
 767         int rc;
 768
 769         FlushStrBuf(Target);
 770 #ifdef HAVE_OPENSSL
 771         if (CCC->redirect_ssl) {
 772 #ifdef BIGBAD_IODBG
 773                 char fn [SIZ];
 774                 FILE *fd;
 775                 int len = 0;
 776                 int rlen = 0;
 777                 int  nlen = 0;
 778                 int nrlen = 0;
 779                 const char *pch;
 780
 781                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 782
 783                 fd = fopen(fn, "a+");
 784                 pch = ChrPtr(CCC->ReadBuf);
 785                 len = StrLength(CCC->ReadBuf);
 786                 if (CCC->Pos != NULL)
 787                         rlen = CC->Pos - pch;
 788                 else
 789                         rlen = 0;
 790
 791 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 792                         len, rlen, pch);
 793 */
 794                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 795                         len, rlen);
 796 #endif
 797                 rc = client_readline_sslbuffer(Target,
 798                                                CCC->ReadBuf,
 799                                                &CCC->Pos,
 800                                                1);
 801 #ifdef BIGBAD_IODBG
 802                 pch = ChrPtr(CCC->ReadBuf);
 803                 nlen = StrLength(CCC->ReadBuf);
 804                 if (CCC->Pos != NULL)
 805                         nrlen = CC->Pos - pch;
 806                 else
 807                         nrlen = 0;
 808 /*
 809                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 810                         len, nlen, rlen, nrlen, pch);
 811 */
 812                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 813                         len, nlen, rlen, nrlen);
 814
 815                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 816                         StrLength(Target), ChrPtr(Target));
 817                 fclose(fd);
 818
 819                 if (rc < 0)
 820                         syslog(LOG_CRIT,
 821                                       "%s failed\n",
 822                                       __FUNCTION__);
 823 #endif
 824                 return rc;
 825         }
 826         else
 827 #endif
 828         {
 829 #ifdef BIGBAD_IODBG
 830                 char fn [SIZ];
 831                 FILE *fd;
 832                 int len, rlen, nlen, nrlen;
 833                 const char *pch;
 834
 835                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 836
 837                 fd = fopen(fn, "a+");
 838                 pch = ChrPtr(CCC->ReadBuf);
 839                 len = StrLength(CCC->ReadBuf);
 840                 if (CCC->Pos != NULL)
 841                         rlen = CC->Pos - pch;
 842                 else
 843                         rlen = 0;
 844
 845 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 846                         len, rlen, pch);
 847 */
 848                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 849                         len, rlen);
 850 #endif
 851                 rc = StrBufTCP_read_buffered_line_fast(Target,
 852                                                        CCC->ReadBuf,
 853                                                        &CCC->Pos,
 854                                                        &CCC->client_socket,
 855                                                        5,
 856                                                        1,
 857                                                        &Error);
 858
 859 #ifdef BIGBAD_IODBG
 860                 pch = ChrPtr(CCC->ReadBuf);
 861                 nlen = StrLength(CCC->ReadBuf);
 862                 if (CCC->Pos != NULL)
 863                         nrlen = CC->Pos - pch;
 864                 else
 865                         nrlen = 0;
 866 /*
 867                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 868                         len, nlen, rlen, nrlen, pch);
 869 */
 870                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 871                         len, nlen, rlen, nrlen);
 872
 873                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 874                         StrLength(Target), ChrPtr(Target));
 875                 fclose(fd);
 876
 877                 if ((rc < 0) && (Error != NULL))
 878                         syslog(LOG_CRIT,
 879                                       "%s failed: %s\n",
 880                                       __FUNCTION__,
 881                                       Error);
 882 #endif
 883                 return rc;
 884         }
 885 }
 886
 887
 888 /*
 889  * client_getln()   ...   Get a LF-terminated line of text from the client.
 890  * (This is implemented in terms of client_read() and could be
 891  * justifiably moved out of sysdep.c)
 892  */
 893 int client_getln(char *buf, int bufsize)
 894 {
 895         int i, retval;
 896         CitContext *CCC=CC;
 897         const char *pCh;
 898
 899         retval = CtdlClientGetLine(CCC->MigrateBuf);
 900         if (retval < 0)
 901           return(retval >= 0);
 902
 903
 904         i = StrLength(CCC->MigrateBuf);
 905         pCh = ChrPtr(CCC->MigrateBuf);
 906         /* Strip the trailing LF, and the trailing CR if present.
 907          */
 908         if (bufsize <= i)
 909                 i = bufsize - 1;
 910         while ( (i > 0)
 911                 && ( (pCh[i - 1]==13)
 912                      || ( pCh[i - 1]==10)) ) {
 913                 i--;
 914         }
 915         memcpy(buf, pCh, i);
 916         buf[i] = 0;
 917
 918         FlushStrBuf(CCC->MigrateBuf);
 919         if (retval < 0) {
 920                 safestrncpy(&buf[i], "000", bufsize - i);
 921         }
 922         return(retval >= 0);
 923 }
 924
 925
 926 /*
 927  * Cleanup any contexts that are left lying around
 928  */
 929
 930
 931 void close_masters (void)
 932 {
 933         struct ServiceFunctionHook *serviceptr;
 934
 935         /*
 936          * close all protocol master sockets
 937          */
 938         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 939             serviceptr = serviceptr->next ) {
 940
 941                 if (serviceptr->tcp_port > 0)
 942                 {
 943                         syslog(LOG_INFO, "Closing listener on port %d\n",
 944                                 serviceptr->tcp_port);
 945                         serviceptr->tcp_port = 0;
 946                 }
 947
 948                 if (serviceptr->sockpath != NULL)
 949                         syslog(LOG_INFO, "Closing listener on '%s'\n",
 950                                 serviceptr->sockpath);
 951
 952                 close(serviceptr->msock);
 953                 /* If it's a Unix domain socket, remove the file. */
 954                 if (serviceptr->sockpath != NULL) {
 955                         unlink(serviceptr->sockpath);
 956                         serviceptr->sockpath = NULL;
 957                 }
 958         }
 959 }
 960
 961
 962 /*
 963  * The system-dependent part of master_cleanup() - close the master socket.
 964  */
 965 void sysdep_master_cleanup(void) {
 966
 967         close_masters();
 968
 969         context_cleanup();
 970
 971 #ifdef HAVE_OPENSSL
 972         destruct_ssl();
 973 #endif
 974         CtdlDestroyProtoHooks();
 975         CtdlDestroyDeleteHooks();
 976         CtdlDestroyXmsgHooks();
 977         CtdlDestroyNetprocHooks();
 978         CtdlDestroyUserHooks();
 979         CtdlDestroyMessageHook();
 980         CtdlDestroyCleanupHooks();
 981         CtdlDestroyFixedOutputHooks();
 982         CtdlDestroySessionHooks();
 983         CtdlDestroyServiceHook();
 984         CtdlDestroyRoomHooks();
 985         CtdlDestroySearchHooks();
 986         #ifdef HAVE_BACKTRACE
 987 ///     eCrash_Uninit();
 988         #endif
 989 }
 990
 991
 992
 993 pid_t current_child;
 994 void graceful_shutdown(int signum) {
 995         kill(current_child, signum);
 996         unlink(file_pid_file);
 997         exit(0);
 998 }
 999
1000 int nFireUps = 0;
1001 int nFireUpsNonRestart = 0;
1002 pid_t ForkedPid = 1;
1003
1004 /*
1005  * Start running as a daemon.
1006  */
1007 void start_daemon(int unused) {
1008         int status = 0;
1009         pid_t child = 0;
1010         FILE *fp;
1011         int do_restart = 0;
1012
1013         current_child = 0;
1014
1015         /* Close stdin/stdout/stderr and replace them with /dev/null.
1016          * We don't just call close() because we don't want these fd's
1017          * to be reused for other files.
1018          */
1019         if (chdir(ctdl_run_dir) != 0)
1020                 syslog(LOG_EMERG,
1021                               "unable to change into directory [%s]: %s",
1022                               ctdl_run_dir, strerror(errno));
1023
1024         child = fork();
1025         if (child != 0) {
1026                 exit(0);
1027         }
1028
1029         signal(SIGHUP, SIG_IGN);
1030         signal(SIGINT, SIG_IGN);
1031         signal(SIGQUIT, SIG_IGN);
1032
1033         setsid();
1034         umask(0);
1035         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1036             (freopen("/dev/null", "w", stdout) != stdout) ||
1037             (freopen("/dev/null", "w", stderr) != stderr))
1038                 syslog(LOG_EMERG,
1039                               "unable to reopen stdin/out/err %s",
1040                               strerror(errno));
1041
1042
1043         do {
1044                 current_child = fork();
1045
1046                 signal(SIGTERM, graceful_shutdown);
1047
1048                 if (current_child < 0) {
1049                         perror("fork");
1050                         exit(errno);
1051                 }
1052
1053                 else if (current_child == 0) {
1054                         return; /* continue starting citadel. */
1055                 }
1056
1057                 else {
1058                         fp = fopen(file_pid_file, "w");
1059                         if (fp != NULL) {
1060                                 fprintf(fp, ""F_PID_T"\n", getpid());
1061                                 fclose(fp);
1062                         }
1063                         waitpid(current_child, &status, 0);
1064                 }
1065                 do_restart = 0;
1066                 nFireUpsNonRestart = nFireUps;
1067
1068                 /* Exit code 0 means the watcher should exit */
1069                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1070                         do_restart = 0;
1071                 }
1072
1073                 /* Exit code 101-109 means the watcher should exit */
1074                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1075                         do_restart = 0;
1076                 }
1077
1078                 /* Any other exit code, or no exit code, means we should restart. */
1079                 else {
1080                         do_restart = 1;
1081                         nFireUps++;
1082                         ForkedPid = current_child;
1083                 }
1084
1085         } while (do_restart);
1086
1087         unlink(file_pid_file);
1088         exit(WEXITSTATUS(status));
1089 }
1090
1091
1092
1093 void checkcrash(void)
1094 {
1095         if (nFireUpsNonRestart != nFireUps)
1096         {
1097                 StrBuf *CrashMail;
1098
1099                 CrashMail = NewStrBuf();
1100                 syslog(LOG_ALERT, "Posting crash message\n");
1101                 StrBufPrintf(CrashMail,
1102                         " \n"
1103                         " The Citadel server process (citserver) terminated unexpectedly."
1104                         "\n \n"
1105                         " This could be the result of a bug in the server program, or some external "
1106                         "factor.\n \n"
1107                         " You can obtain more information about this by enabling core dumps.\n \n"
1108                         " For more information, please see:\n \n"
1109                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1110                         "\n \n"
1111
1112                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1113                         ,
1114                         ctdl_run_dir, ForkedPid);
1115                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1116                 FreeStrBuf(&CrashMail);
1117         }
1118 }
1119
1120
1121 /*
1122  * Generic routine to convert a login name to a full name (gecos)
1123  * Returns nonzero if a conversion took place
1124  */
1125 int convert_login(char NameToConvert[]) {
1126         struct passwd *pw;
1127         int a;
1128
1129         pw = getpwnam(NameToConvert);
1130         if (pw == NULL) {
1131                 return(0);
1132         }
1133         else {
1134                 strcpy(NameToConvert, pw->pw_gecos);
1135                 for (a=0; a<strlen(NameToConvert); ++a) {
1136                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1137                 }
1138                 return(1);
1139         }
1140 }
1141
1142
1143
1144 /*
1145  * This loop just keeps going and going and going...
1146  */
1147 /*
1148  * FIXME:
1149  * This current implimentation of worker_thread creates a bottle neck in several situations
1150  * The first thing to remember is that a single thread can handle more than one connection at a time.
1151  * More threads mean less memory for the system to run in.
1152  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1153  * something to happen anywhere.
1154  * This current implimentation requires worker threads to wait in other locations, after it has
1155  * been committed to a single connection which is very wasteful.
1156  * As an extreme case consider this:
1157  * A slow client connects and this slow client sends only one character each second.
1158  * With this current implimentation a single worker thread is dispatched to handle that connection
1159  * until such times as the client timeout expires, an error occurs on the socket or the client
1160  * completes its transmission.
1161  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1162  * second interval between chars.
1163  *
1164  * It is my intention to re-write this code and the associated client_getln, client_read functions
1165  * to allow any thread to read data on behalf of any connection (context).
1166  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1167  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1168  * process it.
1169  * This worker thread loop also needs to be able to handle binary data.
1170  */
1171
1172 void *worker_thread(void *arg) {
1173         int highest;
1174         CitContext *ptr;
1175         CitContext *bind_me = NULL;
1176         fd_set readfds;
1177         int retval = 0;
1178         struct timeval tv;
1179         int force_purge = 0;
1180
1181
1182         while (!CtdlThreadCheckStop()) {
1183
1184                 /* make doubly sure we're not holding any stale db handles
1185                  * which might cause a deadlock.
1186                  */
1187                 cdb_check_handles();
1188 do_select:      force_purge = 0;
1189                 bind_me = NULL;         /* Which session shall we handle? */
1190
1191                 /* Initialize the fdset. */
1192                 FD_ZERO(&readfds);
1193                 highest = 0;
1194
1195                 begin_critical_section(S_SESSION_TABLE);
1196                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1197                         int client_socket;
1198                         client_socket = ptr->client_socket;
1199                         /* Dont select on dead sessions only truly idle ones */
1200                         if ((ptr->state == CON_IDLE) &&
1201                             (CC->kill_me == 0) &&
1202                             (client_socket != -1))
1203                         {
1204                                 FD_SET(client_socket, &readfds);
1205                                 if (client_socket > highest)
1206                                         highest = client_socket;
1207                         }
1208                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1209                                 bind_me = ptr;
1210                                 ptr->state = CON_EXECUTING;
1211                                 break;
1212                         }
1213                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1214                                 bind_me = ptr;
1215                                 ptr->state = CON_STARTING;
1216                                 break;
1217                         }
1218                 }
1219                 end_critical_section(S_SESSION_TABLE);
1220
1221                 if (bind_me) {
1222                         goto SKIP_SELECT;
1223                 }
1224
1225                 /* If we got this far, it means that there are no sessions
1226                  * which a previous thread marked for attention, so we go
1227                  * ahead and get ready to select().
1228                  */
1229
1230                 if (!CtdlThreadCheckStop()) {
1231                         tv.tv_sec = 1;          /* wake up every second if no input */
1232                         tv.tv_usec = 0;
1233                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1234                 }
1235                 else
1236                         return NULL;
1237
1238                 /* Now figure out who made this select() unblock.
1239                  * First, check for an error or exit condition.
1240                  */
1241                 if (retval < 0) {
1242                         if (errno == EBADF) {
1243                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1244                                         strerror(errno));
1245                                 goto do_select;
1246                         }
1247                         if (errno != EINTR) {
1248                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1249                                 CtdlThreadStopAll();
1250                                 continue;
1251                         } else {
1252                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1253                                 if (CtdlThreadCheckStop()) return(NULL);
1254                                 goto do_select;
1255                         }
1256                 }
1257                 else if(retval == 0) {
1258                         if (CtdlThreadCheckStop()) return(NULL);
1259                 }
1260
1261                 /* It must be a client socket.  Find a context that has data
1262                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1263                  * active sockets other than our chosen one are marked as
1264                  * CON_READY so the next thread that comes around can just bind
1265                  * to one without having to select() again.
1266                  */
1267                 begin_critical_section(S_SESSION_TABLE);
1268                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1269                         int checkfd = ptr->client_socket;
1270                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1271                                 if (FD_ISSET(checkfd, &readfds)) {
1272                                         ptr->input_waiting = 1;
1273                                         if (!bind_me) {
1274                                                 bind_me = ptr;  /* I choose you! */
1275                                                 bind_me->state = CON_EXECUTING;
1276                                         }
1277                                         else {
1278                                                 ptr->state = CON_READY;
1279                                         }
1280                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1281                                         if (!bind_me) {
1282                                                 bind_me = ptr;  /* I choose you! */
1283                                                 bind_me->state = CON_EXECUTING;
1284                                         }
1285                                         else {
1286                                                 ptr->state = CON_READY;
1287                                         }
1288                                 }
1289                         }
1290                 }
1291                 end_critical_section(S_SESSION_TABLE);
1292
1293 SKIP_SELECT:
1294                 /* We're bound to a session */
1295                 if (bind_me != NULL) {
1296                         become_session(bind_me);
1297
1298                         if (bind_me->state == CON_STARTING) {
1299                                 bind_me->state = CON_EXECUTING;
1300                                 begin_session(bind_me);
1301                                 bind_me->h_greeting_function();
1302                         }
1303                         /* If the client has sent a command, execute it. */
1304                         if (CC->input_waiting) {
1305                                 CC->h_command_function();
1306
1307                                 while (HaveMoreLinesWaiting(CC))
1308                                        CC->h_command_function();
1309
1310                                 CC->input_waiting = 0;
1311                         }
1312
1313                         /* If there are asynchronous messages waiting and the
1314                          * client supports it, do those now */
1315                         if ((CC->is_async) && (CC->async_waiting)
1316                            && (CC->h_async_function != NULL)) {
1317                                 CC->h_async_function();
1318                                 CC->async_waiting = 0;
1319                         }
1320
1321                         force_purge = CC->kill_me;
1322                         become_session(NULL);
1323                         bind_me->state = CON_IDLE;
1324                 }
1325
1326                 dead_session_purge(force_purge);
1327                 do_housekeeping();
1328         }
1329         /* If control reaches this point, the server is shutting down */
1330         return(NULL);
1331 }
1332
1333
1334
1335
1336 /*
1337  * A function to handle selecting on master sockets.
1338  * In other words it handles new connections.
1339  * It is a thread.
1340  */
1341 void *select_on_master (void *arg)
1342 {
1343         struct ServiceFunctionHook *serviceptr;
1344         fd_set master_fds;
1345         int highest;
1346         struct timeval tv;
1347         int ssock;                      /* Descriptor for client socket */
1348         CitContext *con= NULL;  /* Temporary context pointer */
1349         int m;
1350         int i;
1351         int retval;
1352         struct CitContext select_on_master_CC;
1353
1354         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1355         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1356
1357         while (!CtdlThreadCheckStop()) {
1358                 /* Initialize the fdset. */
1359                 FD_ZERO(&master_fds);
1360                 highest = 0;
1361
1362                 /* First, add the various master sockets to the fdset. */
1363                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1364                 serviceptr = serviceptr->next ) {
1365                         m = serviceptr->msock;
1366                         FD_SET(m, &master_fds);
1367                         if (m > highest) {
1368                                 highest = m;
1369                         }
1370                 }
1371
1372                 if (!CtdlThreadCheckStop()) {
1373                         tv.tv_sec = 60;         /* wake up every second if no input */
1374                         tv.tv_usec = 0;
1375                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1376                 }
1377                 else
1378                         return NULL;
1379
1380                 /* Now figure out who made this select() unblock.
1381                  * First, check for an error or exit condition.
1382                  */
1383                 if (retval < 0) {
1384                         if (errno == EBADF) {
1385                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1386                                         strerror(errno));
1387                                 continue;
1388                         }
1389                         if (errno != EINTR) {
1390                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1391                                 CtdlThreadStopAll();
1392                         } else {
1393                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1394                                 if (CtdlThreadCheckStop()) return(NULL);
1395                                 continue;
1396                         }
1397                 }
1398                 else if(retval == 0) {
1399                         if (CtdlThreadCheckStop()) return(NULL);
1400                         continue;
1401                 }
1402                 /* Next, check to see if it's a new client connecting
1403                  * on a master socket.
1404                  */
1405                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1406                      serviceptr = serviceptr->next ) {
1407
1408                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1409                                 ssock = accept(serviceptr->msock, NULL, 0);
1410                                 if (ssock >= 0) {
1411                                         syslog(LOG_DEBUG,
1412                                                 "New client socket %d\n",
1413                                                 ssock);
1414
1415                                         /* The master socket is non-blocking but the client
1416                                          * sockets need to be blocking, otherwise certain
1417                                          * operations barf on FreeBSD.  Not a fatal error.
1418                                          */
1419                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1420                                                 syslog(LOG_EMERG,
1421                                                         "citserver: Can't set socket to blocking: %s\n",
1422                                                         strerror(errno));
1423                                         }
1424
1425                                         /* New context will be created already
1426                                          * set up in the CON_EXECUTING state.
1427                                          */
1428                                         con = CreateNewContext();
1429
1430                                         /* Assign our new socket number to it. */
1431                                         con->client_socket = ssock;
1432                                         con->h_command_function =
1433                                                 serviceptr->h_command_function;
1434                                         con->h_async_function =
1435                                                 serviceptr->h_async_function;
1436                                         con->h_greeting_function = serviceptr->h_greeting_function;
1437                                         con->ServiceName =
1438                                                 serviceptr->ServiceName;
1439
1440                                         /* Determine whether it's a local socket */
1441                                         if (serviceptr->sockpath != NULL)
1442                                                 con->is_local_socket = 1;
1443
1444                                         /* Set the SO_REUSEADDR socket option */
1445                                         i = 1;
1446                                         setsockopt(ssock, SOL_SOCKET,
1447                                                 SO_REUSEADDR,
1448                                                 &i, sizeof(i));
1449
1450                                         con->state = CON_GREETING;
1451
1452                                         retval--;
1453                                         if (retval == 0)
1454                                                 break;
1455                                 }
1456                         }
1457                 }
1458         }
1459         CtdlClearSystemContext();
1460
1461         return NULL;
1462 }
1463
1464
1465
1466 /*
1467  * SyslogFacility()
1468  * Translate text facility name to syslog.h defined value.
1469  */
1470 int SyslogFacility(char *name)
1471 {
1472         int i;
1473         struct
1474         {
1475                 int facility;
1476                 char *name;
1477         }   facTbl[] =
1478         {
1479                 {   LOG_KERN,   "kern"          },
1480                 {   LOG_USER,   "user"          },
1481                 {   LOG_MAIL,   "mail"          },
1482                 {   LOG_DAEMON, "daemon"        },
1483                 {   LOG_AUTH,   "auth"          },
1484                 {   LOG_SYSLOG, "syslog"        },
1485                 {   LOG_LPR,    "lpr"           },
1486                 {   LOG_NEWS,   "news"          },
1487                 {   LOG_UUCP,   "uucp"          },
1488                 {   LOG_LOCAL0, "local0"        },
1489                 {   LOG_LOCAL1, "local1"        },
1490                 {   LOG_LOCAL2, "local2"        },
1491                 {   LOG_LOCAL3, "local3"        },
1492                 {   LOG_LOCAL4, "local4"        },
1493                 {   LOG_LOCAL5, "local5"        },
1494                 {   LOG_LOCAL6, "local6"        },
1495                 {   LOG_LOCAL7, "local7"        },
1496                 {   0,            NULL          }
1497         };
1498         for(i = 0; facTbl[i].name != NULL; i++) {
1499                 if(!strcasecmp(name, facTbl[i].name))
1500                         return facTbl[i].facility;
1501         }
1502         return LOG_DAEMON;
1503 }
1504
1505
1506 /********** MEM CHEQQER ***********/
1507
1508 #ifdef DEBUG_MEMORY_LEAKS
1509
1510 #undef malloc
1511 #undef realloc
1512 #undef strdup
1513 #undef free
1514
1515 void *tracked_malloc(size_t size, char *file, int line) {
1516         struct igheap *thisheap;
1517         void *block;
1518
1519         block = malloc(size);
1520         if (block == NULL) return(block);
1521
1522         thisheap = malloc(sizeof(struct igheap));
1523         if (thisheap == NULL) {
1524                 free(block);
1525                 return(NULL);
1526         }
1527
1528         thisheap->block = block;
1529         strcpy(thisheap->file, file);
1530         thisheap->line = line;
1531
1532         begin_critical_section(S_DEBUGMEMLEAKS);
1533         thisheap->next = igheap;
1534         igheap = thisheap;
1535         end_critical_section(S_DEBUGMEMLEAKS);
1536
1537         return(block);
1538 }
1539
1540
1541 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1542         struct igheap *thisheap;
1543         void *block;
1544
1545         block = realloc(ptr, size);
1546         if (block == NULL) return(block);
1547
1548         thisheap = malloc(sizeof(struct igheap));
1549         if (thisheap == NULL) {
1550                 free(block);
1551                 return(NULL);
1552         }
1553
1554         thisheap->block = block;
1555         strcpy(thisheap->file, file);
1556         thisheap->line = line;
1557
1558         begin_critical_section(S_DEBUGMEMLEAKS);
1559         thisheap->next = igheap;
1560         igheap = thisheap;
1561         end_critical_section(S_DEBUGMEMLEAKS);
1562
1563         return(block);
1564 }
1565
1566
1567
1568 void tracked_free(void *ptr) {
1569         struct igheap *thisheap;
1570         struct igheap *trash;
1571
1572         free(ptr);
1573
1574         if (igheap == NULL) return;
1575         begin_critical_section(S_DEBUGMEMLEAKS);
1576         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1577                 if (thisheap->next != NULL) {
1578                         if (thisheap->next->block == ptr) {
1579                                 trash = thisheap->next;
1580                                 thisheap->next = thisheap->next->next;
1581                                 free(trash);
1582                         }
1583                 }
1584         }
1585         if (igheap->block == ptr) {
1586                 trash = igheap;
1587                 igheap = igheap->next;
1588                 free(trash);
1589         }
1590         end_critical_section(S_DEBUGMEMLEAKS);
1591 }
1592
1593 char *tracked_strdup(const char *s, char *file, int line) {
1594         char *ptr;
1595
1596         if (s == NULL) return(NULL);
1597         ptr = tracked_malloc(strlen(s) + 1, file, line);
1598         if (ptr == NULL) return(NULL);
1599         strncpy(ptr, s, strlen(s));
1600         return(ptr);
1601 }
1602
1603 void dump_heap(void) {
1604         struct igheap *thisheap;
1605
1606         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1607                 syslog(LOG_CRIT, "UNFREED: %30s : %d\n",
1608                         thisheap->file, thisheap->line);
1609         }
1610 }
1611
1612 #endif /*  DEBUG_MEMORY_LEAKS */