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         ThreadTSD *Cc;
 115
 116         Cc = CTP;
 117         if (Cc && Cc->self)
 118                 Cc->self->signal = signum;
 119         else
 120         {
 121                 syslog(LOG_DEBUG, "Caught signal %d; shutting down.\n", signum);
 122                 exit_signal = signum;
 123         }
 124 }
 125
 126 static RETSIGTYPE signal_exit(int signum) {
 127         exit(1);
 128 }
 129
 130
 131
 132 /*
 133  * Some initialization stuff...
 134  */
 135 void init_sysdep(void) {
 136         sigset_t set;
 137
 138         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 139 #ifdef FD_SETSIZE
 140 #ifdef RLIMIT_NOFILE
 141         struct rlimit rl;
 142         getrlimit(RLIMIT_NOFILE, &rl);
 143         rl.rlim_cur = FD_SETSIZE;
 144         rl.rlim_max = FD_SETSIZE;
 145         setrlimit(RLIMIT_NOFILE, &rl);
 146 #endif
 147 #endif
 148
 149         /* If we've got OpenSSL, we're going to use it. */
 150 #ifdef HAVE_OPENSSL
 151         init_ssl();
 152 #endif
 153
 154         /*
 155          * Set up a place to put thread-specific data.
 156          * We only need a single pointer per thread - it points to the
 157          * CitContext structure (in the ContextList linked list) of the
 158          * session to which the calling thread is currently bound.
 159          */
 160         if (citthread_key_create(&MyConKey, NULL) != 0) {
 161                 syslog(LOG_CRIT, "Can't create TSD key: %s\n",
 162                         strerror(errno));
 163         }
 164
 165         /*
 166          * The action for unexpected signals and exceptions should be to
 167          * call signal_cleanup() to gracefully shut down the server.
 168          */
 169         sigemptyset(&set);
 170         sigaddset(&set, SIGINT);                // intr = shutdown
 171         // sigaddset(&set, SIGQUIT);            // quit = force quit
 172         sigaddset(&set, SIGHUP);
 173         sigaddset(&set, SIGTERM);
 174         // sigaddset(&set, SIGSEGV);            // we want core dumps
 175         // sigaddset(&set, SIGILL);             // we want core dumps
 176         // sigaddset(&set, SIGBUS);
 177         sigprocmask(SIG_UNBLOCK, &set, NULL);
 178
 179         signal(SIGINT, signal_cleanup);         // intr = shutdown
 180         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 181         signal(SIGHUP, signal_cleanup);
 182         signal(SIGTERM, signal_cleanup);
 183         signal(SIGUSR2, signal_exit);
 184         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 185         // signal(SIGILL, signal_cleanup);      // we want core dumps
 186         // signal(SIGBUS, signal_cleanup);
 187
 188         /*
 189          * Do not shut down the server on broken pipe signals, otherwise the
 190          * whole Citadel service would come down whenever a single client
 191          * socket breaks.
 192          */
 193         signal(SIGPIPE, SIG_IGN);
 194 }
 195
 196
 197 /*
 198  * This is a generic function to set up a master socket for listening on
 199  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 200  *
 201  * ip_addr      IP address to bind
 202  * port_number  port number to bind
 203  * queue_len    number of incoming connections to allow in the queue
 204  */
 205 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 206 {
 207         struct protoent *p;
 208         struct sockaddr_in6 sin6;
 209         struct sockaddr_in sin4;
 210         int s, i, b;
 211         int ip_version = 6;
 212
 213         memset(&sin6, 0, sizeof(sin6));
 214         memset(&sin4, 0, sizeof(sin4));
 215         sin6.sin6_family = AF_INET6;
 216         sin4.sin_family = AF_INET;
 217
 218         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 219                 || (IsEmptyStr(ip_addr))
 220                 || (!strcmp(ip_addr, "*"))
 221         ) {
 222                 ip_version = 6;
 223                 sin6.sin6_addr = in6addr_any;
 224         }
 225         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 226         {
 227                 ip_version = 4;
 228                 sin4.sin_addr.s_addr = INADDR_ANY;
 229         }
 230         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 231         {
 232                 ip_version = 4;
 233                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 234                         snprintf(errormessage, SIZ,
 235                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 236                         );
 237                         syslog(LOG_ALERT, "%s\n", errormessage);
 238                         return (-1);
 239                 }
 240         }
 241         else                                                                            /* specific IPv6 */
 242         {
 243                 ip_version = 6;
 244                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 245                         snprintf(errormessage, SIZ,
 246                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 247                         );
 248                         syslog(LOG_ALERT, "%s\n", errormessage);
 249                         return (-1);
 250                 }
 251         }
 252
 253         if (port_number == 0) {
 254                 snprintf(errormessage, SIZ,
 255                          "Can't start: no port number specified."
 256                 );
 257                 syslog(LOG_ALERT, "%s\n", errormessage);
 258                 return (-1);
 259         }
 260         sin6.sin6_port = htons((u_short) port_number);
 261         sin4.sin_port = htons((u_short) port_number);
 262
 263         p = getprotobyname("tcp");
 264
 265         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 266         if (s < 0) {
 267                 snprintf(errormessage, SIZ,
 268                          "Can't create a listening socket: %s", strerror(errno)
 269                 );
 270                 syslog(LOG_ALERT, "%s\n", errormessage);
 271                 return (-1);
 272         }
 273         /* Set some socket options that make sense. */
 274         i = 1;
 275         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 276
 277         if (ip_version == 6) {
 278                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 279         }
 280         else {
 281                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 282         }
 283
 284         if (b < 0) {
 285                 snprintf(errormessage, SIZ,
 286                          "Can't bind: %s", strerror(errno)
 287                 );
 288                 syslog(LOG_ALERT, "%s\n", errormessage);
 289                 return (-1);
 290         }
 291
 292         fcntl(s, F_SETFL, O_NONBLOCK);
 293
 294         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 295                 snprintf(errormessage, SIZ,
 296                          "Can't listen: %s", strerror(errno)
 297                 );
 298                 syslog(LOG_ALERT, "%s\n", errormessage);
 299                 return (-1);
 300         }
 301         return (s);
 302 }
 303
 304
 305
 306
 307
 308 /*
 309  * Create a Unix domain socket and listen on it
 310  */
 311 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 312 {
 313         struct sockaddr_un addr;
 314         int s;
 315         int i;
 316         int actual_queue_len;
 317 #ifdef HAVE_STRUCT_UCRED
 318         int passcred = 1;
 319 #endif
 320
 321         actual_queue_len = queue_len;
 322         if (actual_queue_len < 5) actual_queue_len = 5;
 323
 324         i = unlink(sockpath);
 325         if ((i != 0) && (errno != ENOENT)) {
 326                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 327                         sockpath, strerror(errno)
 328                 );
 329                 syslog(LOG_EMERG, "%s\n", errormessage);
 330                 return(-1);
 331         }
 332
 333         memset(&addr, 0, sizeof(addr));
 334         addr.sun_family = AF_UNIX;
 335         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 336
 337         s = socket(AF_UNIX, SOCK_STREAM, 0);
 338         if (s < 0) {
 339                 snprintf(errormessage, SIZ,
 340                          "citserver: Can't create a socket: %s",
 341                          strerror(errno));
 342                 syslog(LOG_EMERG, "%s\n", errormessage);
 343                 return(-1);
 344         }
 345
 346         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 347                 snprintf(errormessage, SIZ,
 348                          "citserver: Can't bind: %s",
 349                          strerror(errno));
 350                 syslog(LOG_EMERG, "%s\n", errormessage);
 351                 return(-1);
 352         }
 353
 354         /* set to nonblock - we need this for some obscure situations */
 355         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 356                 snprintf(errormessage, SIZ,
 357                          "citserver: Can't set socket to non-blocking: %s",
 358                          strerror(errno));
 359                 syslog(LOG_EMERG, "%s\n", errormessage);
 360                 close(s);
 361                 return(-1);
 362         }
 363
 364         if (listen(s, actual_queue_len) < 0) {
 365                 snprintf(errormessage, SIZ,
 366                          "citserver: Can't listen: %s",
 367                          strerror(errno));
 368                 syslog(LOG_EMERG, "%s\n", errormessage);
 369                 return(-1);
 370         }
 371
 372 #ifdef HAVE_STRUCT_UCRED
 373         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 374 #endif
 375
 376         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 377         return(s);
 378 }
 379
 380
 381
 382 /*
 383  * The following functions implement output buffering on operating systems which
 384  * support it (such as Linux and various BSD flavors).
 385  */
 386 #ifndef HAVE_DARWIN
 387 #ifdef TCP_CORK
 388 #       define HAVE_TCP_BUFFERING
 389 #else
 390 #       ifdef TCP_NOPUSH
 391 #               define HAVE_TCP_BUFFERING
 392 #               define TCP_CORK TCP_NOPUSH
 393 #       endif
 394 #endif /* TCP_CORK */
 395 #endif /* HAVE_DARWIN */
 396
 397 static unsigned on = 1, off = 0;
 398
 399 void buffer_output(void) {
 400 #ifdef HAVE_TCP_BUFFERING
 401 #ifdef HAVE_OPENSSL
 402         if (!CC->redirect_ssl)
 403 #endif
 404                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 405 #endif
 406 }
 407
 408 void unbuffer_output(void) {
 409 #ifdef HAVE_TCP_BUFFERING
 410 #ifdef HAVE_OPENSSL
 411         if (!CC->redirect_ssl)
 412 #endif
 413                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 414 #endif
 415 }
 416
 417 void flush_output(void) {
 418 #ifdef HAVE_TCP_BUFFERING
 419         struct CitContext *CCC = CC;
 420         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 421         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 422 #endif
 423 }
 424
 425 /*
 426 static void flush_client_inbuf(void)
 427 {
 428         CitContext *CCC=CC;
 429
 430         FlushStrBuf(CCC->ReadBuf);
 431         CCC->RecvBuf->ReadWritePointer = NULL;
 432
 433 }
 434 */
 435
 436 /*
 437  * client_write()   ...    Send binary data to the client.
 438  */
 439 int client_write(const char *buf, int nbytes)
 440 {
 441         int bytes_written = 0;
 442         int retval;
 443 #ifndef HAVE_TCP_BUFFERING
 444         int old_buffer_len = 0;
 445 #endif
 446         fd_set wset;
 447         CitContext *Ctx;
 448         int fdflags;
 449
 450         if (nbytes < 1) return(0);
 451
 452         Ctx = CC;
 453
 454 #ifdef BIGBAD_IODBG
 455         {
 456                 int rv = 0;
 457                 char fn [SIZ];
 458                 FILE *fd;
 459
 460                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 461
 462                 fd = fopen(fn, "a+");
 463                 if (fd)
 464                 {
 465                     fprintf(fd, "Sending: BufSize: %d BufContent: [",
 466                             nbytes);
 467                     rv = fwrite(buf, nbytes, 1, fd);
 468                     fprintf(fd, "]\n");
 469                     fclose(fd);
 470                 }
 471         }
 472 #endif
 473 //      flush_client_inbuf();
 474         if (Ctx->redirect_buffer != NULL) {
 475                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 476                                      buf, nbytes, 0);
 477                 return 0;
 478         }
 479
 480 #ifdef HAVE_OPENSSL
 481         if (Ctx->redirect_ssl) {
 482                 client_write_ssl(buf, nbytes);
 483                 return 0;
 484         }
 485 #endif
 486         if (Ctx->client_socket == -1) return -1;
 487
 488         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 489
 490         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 491                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 492                         FD_ZERO(&wset);
 493                         FD_SET(Ctx->client_socket, &wset);
 494                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 495                                 if (errno == EINTR)
 496                                 {
 497                                         syslog(LOG_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 498                                         if (CtdlThreadCheckStop()) {
 499                                                 CC->kill_me = 1;
 500                                                 return (-1);
 501                                         } else {
 502                                                 /* can't trust fd's and stuff so we need to re-create them */
 503                                                 continue;
 504                                         }
 505                                 } else {
 506                                         syslog(LOG_ERR,
 507                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 508                                                 nbytes - bytes_written,
 509                                                 strerror(errno), errno);
 510                                         cit_backtrace();
 511                                         Ctx->kill_me = 1;
 512                                         return -1;
 513                                 }
 514                         }
 515                 }
 516
 517                 retval = write(Ctx->client_socket, &buf[bytes_written],
 518                         nbytes - bytes_written);
 519                 if (retval < 1) {
 520                         syslog(LOG_ERR,
 521                                 "client_write(%d bytes) failed: %s (%d)\n",
 522                                 nbytes - bytes_written,
 523                                 strerror(errno), errno);
 524                         cit_backtrace();
 525                         // syslog(LOG_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 526                         Ctx->kill_me = 1;
 527                         return -1;
 528                 }
 529                 bytes_written = bytes_written + retval;
 530         }
 531         return 0;
 532 }
 533
 534 void cputbuf(const StrBuf *Buf) {
 535         client_write(ChrPtr(Buf), StrLength(Buf));
 536 }
 537
 538
 539 /*
 540  * cprintf()    Send formatted printable data to the client.
 541  *              Implemented in terms of client_write() so it's technically not sysdep...
 542  */
 543 void cprintf(const char *format, ...) {
 544         va_list arg_ptr;
 545         char buf[1024];
 546
 547         va_start(arg_ptr, format);
 548         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 549                 buf[sizeof buf - 2] = '\n';
 550         client_write(buf, strlen(buf));
 551         va_end(arg_ptr);
 552 }
 553
 554
 555 /*
 556  * Read data from the client socket.
 557  *
 558  * sock         socket fd to read from
 559  * buf          buffer to read into
 560  * bytes        number of bytes to read
 561  * timeout      Number of seconds to wait before timing out
 562  *
 563  * Possible return values:
 564  *      1       Requested number of bytes has been read.
 565  *      0       Request timed out.
 566  *      -1      Connection is broken, or other error.
 567  */
 568 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 569 {
 570         CitContext *CCC=CC;
 571         const char *Error;
 572         int retval = 0;
 573
 574 #ifdef HAVE_OPENSSL
 575         if (CCC->redirect_ssl) {
 576 #ifdef BIGBAD_IODBG
 577                 int rv = 0;
 578                 char fn [SIZ];
 579                 FILE *fd;
 580
 581                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 582
 583                 fd = fopen(fn, "a+");
 584                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 585                         bytes);
 586                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 587                 fprintf(fd, "]\n");
 588
 589
 590                 fclose(fd);
 591 #endif
 592                 retval = client_read_sslblob(Target, bytes, timeout);
 593                 if (retval < 0) {
 594                         syslog(LOG_CRIT,
 595                                       "%s failed\n",
 596                                       __FUNCTION__);
 597                 }
 598 #ifdef BIGBAD_IODBG
 599                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 600
 601                 fd = fopen(fn, "a+");
 602                 fprintf(fd, "Read: %d BufContent: [",
 603                         StrLength(Target));
 604                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 605                 fprintf(fd, "]\n");
 606
 607
 608                 fclose(fd);
 609 #endif
 610         }
 611         else
 612 #endif
 613         {
 614 #ifdef BIGBAD_IODBG
 615                 int rv = 0;
 616                 char fn [SIZ];
 617                 FILE *fd;
 618
 619                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 620
 621                 fd = fopen(fn, "a+");
 622                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 623                         bytes);
 624                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 625                 fprintf(fd, "]\n");
 626
 627
 628                 fclose(fd);
 629 #endif
 630                 retval = StrBufReadBLOBBuffered(Target,
 631                                                 CCC->RecvBuf.Buf,
 632                                                 &CCC->RecvBuf.ReadWritePointer,
 633                                                 &CCC->client_socket,
 634                                                 1,
 635                                                 bytes,
 636                                                 O_TERM,
 637                                                 &Error);
 638                 if (retval < 0) {
 639                         syslog(LOG_CRIT,
 640                                       "%s failed: %s\n",
 641                                       __FUNCTION__,
 642                                       Error);
 643                         return retval;
 644                 }
 645 #ifdef BIGBAD_IODBG
 646                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 647
 648                 fd = fopen(fn, "a+");
 649                 fprintf(fd, "Read: %d BufContent: [",
 650                         StrLength(Target));
 651                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 652                 fprintf(fd, "]\n");
 653
 654
 655                 fclose(fd);
 656 #endif
 657         }
 658         return retval;
 659 }
 660
 661
 662 /*
 663  * to make client_read_random_blob() more efficient, increase buffer size.
 664  * just use in greeting function, else your buffer may be flushed
 665  */
 666 void client_set_inbound_buf(long N)
 667 {
 668         CitContext *CCC=CC;
 669         FlushStrBuf(CCC->RecvBuf.Buf);
 670         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 671 }
 672
 673 int client_read_random_blob(StrBuf *Target, int timeout)
 674 {
 675         CitContext *CCC=CC;
 676         int rc;
 677
 678         rc =  client_read_blob(Target, 1, timeout);
 679         if (rc > 0)
 680         {
 681                 long len;
 682                 const char *pch;
 683
 684                 len = StrLength(CCC->RecvBuf.Buf);
 685                 pch = ChrPtr(CCC->RecvBuf.Buf);
 686
 687                 if (len > 0)
 688                 {
 689                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 690                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 691                                 pch = CCC->RecvBuf.ReadWritePointer;
 692                         }
 693                         StrBufAppendBufPlain(Target, pch, len, 0);
 694                         FlushStrBuf(CCC->RecvBuf.Buf);
 695                         CCC->RecvBuf.ReadWritePointer = NULL;
 696 #ifdef BIGBAD_IODBG
 697                         {
 698                                 int rv = 0;
 699                                 char fn [SIZ];
 700                                 FILE *fd;
 701
 702                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 703
 704                                 fd = fopen(fn, "a+");
 705                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 706                                         StrLength(Target));
 707                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 708                                 fprintf(fd, "]\n");
 709
 710
 711                                 fclose(fd);
 712                         }
 713 #endif
 714
 715                         return StrLength(Target);
 716                 }
 717                 return rc;
 718         }
 719         else
 720                 return rc;
 721 }
 722
 723 int client_read_to(char *buf, int bytes, int timeout)
 724 {
 725         CitContext *CCC=CC;
 726         int rc;
 727
 728         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 729         if (rc < 0)
 730         {
 731                 *buf = '\0';
 732                 return rc;
 733         }
 734         else
 735         {
 736                 memcpy(buf,
 737                        ChrPtr(CCC->MigrateBuf),
 738                        StrLength(CCC->MigrateBuf) + 1);
 739                 FlushStrBuf(CCC->MigrateBuf);
 740                 return rc;
 741         }
 742 }
 743
 744
 745 int HaveMoreLinesWaiting(CitContext *CCC)
 746 {
 747         if ((CCC->kill_me == 1) || (
 748             (CCC->RecvBuf.ReadWritePointer == NULL) &&
 749             (StrLength(CCC->RecvBuf.Buf) == 0) &&
 750             (CCC->client_socket != -1)) )
 751                 return 0;
 752         else
 753                 return 1;
 754 }
 755
 756
 757 /*
 758  * Read data from the client socket with default timeout.
 759  * (This is implemented in terms of client_read_to() and could be
 760  * justifiably moved out of sysdep.c)
 761  */
 762 INLINE int client_read(char *buf, int bytes)
 763 {
 764         return(client_read_to(buf, bytes, config.c_sleeping));
 765 }
 766
 767 int CtdlClientGetLine(StrBuf *Target)
 768 {
 769         CitContext *CCC=CC;
 770         const char *Error;
 771         int rc;
 772
 773         FlushStrBuf(Target);
 774 #ifdef HAVE_OPENSSL
 775         if (CCC->redirect_ssl) {
 776 #ifdef BIGBAD_IODBG
 777                 char fn [SIZ];
 778                 FILE *fd;
 779                 int len = 0;
 780                 int rlen = 0;
 781                 int  nlen = 0;
 782                 int nrlen = 0;
 783                 const char *pch;
 784
 785                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 786
 787                 fd = fopen(fn, "a+");
 788                 pch = ChrPtr(CCC->RecvBuf.Buf);
 789                 len = StrLength(CCC->RecvBuf.Buf);
 790                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 791                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 792                 else
 793                         rlen = 0;
 794
 795 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 796                         len, rlen, pch);
 797 */
 798                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 799                         len, rlen);
 800 #endif
 801                 rc = client_readline_sslbuffer(Target,
 802                                                CCC->RecvBuf.Buf,
 803                                                &CCC->RecvBuf.ReadWritePointer,
 804                                                1);
 805 #ifdef BIGBAD_IODBG
 806                 pch = ChrPtr(CCC->RecvBuf.Buf);
 807                 nlen = StrLength(CCC->RecvBuf.Buf);
 808                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 809                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 810                 else
 811                         nrlen = 0;
 812 /*
 813                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 814                         len, nlen, rlen, nrlen, pch);
 815 */
 816                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 817                         len, nlen, rlen, nrlen);
 818
 819                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 820                         StrLength(Target), ChrPtr(Target));
 821                 fclose(fd);
 822
 823                 if (rc < 0)
 824                         syslog(LOG_CRIT,
 825                                       "%s failed\n",
 826                                       __FUNCTION__);
 827 #endif
 828                 return rc;
 829         }
 830         else
 831 #endif
 832         {
 833 #ifdef BIGBAD_IODBG
 834                 char fn [SIZ];
 835                 FILE *fd;
 836                 int len, rlen, nlen, nrlen;
 837                 const char *pch;
 838
 839                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 840
 841                 fd = fopen(fn, "a+");
 842                 pch = ChrPtr(CCC->RecvBuf.Buf);
 843                 len = StrLength(CCC->RecvBuf.Buf);
 844                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 845                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 846                 else
 847                         rlen = 0;
 848
 849 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 850                         len, rlen, pch);
 851 */
 852                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 853                         len, rlen);
 854 #endif
 855                 rc = StrBufTCP_read_buffered_line_fast(Target,
 856                                                        CCC->RecvBuf.Buf,
 857                                                        &CCC->RecvBuf.ReadWritePointer,
 858                                                        &CCC->client_socket,
 859                                                        5,
 860                                                        1,
 861                                                        &Error);
 862
 863 #ifdef BIGBAD_IODBG
 864                 pch = ChrPtr(CCC->RecvBuf.Buf);
 865                 nlen = StrLength(CCC->RecvBuf.Buf);
 866                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 867                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 868                 else
 869                         nrlen = 0;
 870 /*
 871                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 872                         len, nlen, rlen, nrlen, pch);
 873 */
 874                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 875                         len, nlen, rlen, nrlen);
 876
 877                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 878                         StrLength(Target), ChrPtr(Target));
 879                 fclose(fd);
 880
 881                 if ((rc < 0) && (Error != NULL))
 882                         syslog(LOG_CRIT,
 883                                       "%s failed: %s\n",
 884                                       __FUNCTION__,
 885                                       Error);
 886 #endif
 887                 return rc;
 888         }
 889 }
 890
 891
 892 /*
 893  * client_getln()   ...   Get a LF-terminated line of text from the client.
 894  * (This is implemented in terms of client_read() and could be
 895  * justifiably moved out of sysdep.c)
 896  */
 897 int client_getln(char *buf, int bufsize)
 898 {
 899         int i, retval;
 900         CitContext *CCC=CC;
 901         const char *pCh;
 902
 903         retval = CtdlClientGetLine(CCC->MigrateBuf);
 904         if (retval < 0)
 905           return(retval >= 0);
 906
 907
 908         i = StrLength(CCC->MigrateBuf);
 909         pCh = ChrPtr(CCC->MigrateBuf);
 910         /* Strip the trailing LF, and the trailing CR if present.
 911          */
 912         if (bufsize <= i)
 913                 i = bufsize - 1;
 914         while ( (i > 0)
 915                 && ( (pCh[i - 1]==13)
 916                      || ( pCh[i - 1]==10)) ) {
 917                 i--;
 918         }
 919         memcpy(buf, pCh, i);
 920         buf[i] = 0;
 921
 922         FlushStrBuf(CCC->MigrateBuf);
 923         if (retval < 0) {
 924                 safestrncpy(&buf[i], "000", bufsize - i);
 925         }
 926         return(retval >= 0);
 927 }
 928
 929
 930 /*
 931  * Cleanup any contexts that are left lying around
 932  */
 933
 934
 935 void close_masters (void)
 936 {
 937         struct ServiceFunctionHook *serviceptr;
 938
 939         /*
 940          * close all protocol master sockets
 941          */
 942         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 943             serviceptr = serviceptr->next ) {
 944
 945                 if (serviceptr->tcp_port > 0)
 946                 {
 947                         syslog(LOG_INFO, "Closing listener on port %d\n",
 948                                 serviceptr->tcp_port);
 949                         serviceptr->tcp_port = 0;
 950                 }
 951
 952                 if (serviceptr->sockpath != NULL)
 953                         syslog(LOG_INFO, "Closing listener on '%s'\n",
 954                                 serviceptr->sockpath);
 955
 956                 close(serviceptr->msock);
 957                 /* If it's a Unix domain socket, remove the file. */
 958                 if (serviceptr->sockpath != NULL) {
 959                         unlink(serviceptr->sockpath);
 960                         serviceptr->sockpath = NULL;
 961                 }
 962         }
 963 }
 964
 965
 966 /*
 967  * The system-dependent part of master_cleanup() - close the master socket.
 968  */
 969 void sysdep_master_cleanup(void) {
 970
 971         close_masters();
 972
 973         context_cleanup();
 974
 975 #ifdef HAVE_OPENSSL
 976         destruct_ssl();
 977 #endif
 978         CtdlDestroyProtoHooks();
 979         CtdlDestroyDeleteHooks();
 980         CtdlDestroyXmsgHooks();
 981         CtdlDestroyNetprocHooks();
 982         CtdlDestroyUserHooks();
 983         CtdlDestroyMessageHook();
 984         CtdlDestroyCleanupHooks();
 985         CtdlDestroyFixedOutputHooks();
 986         CtdlDestroySessionHooks();
 987         CtdlDestroyServiceHook();
 988         CtdlDestroyRoomHooks();
 989         CtdlDestroySearchHooks();
 990         #ifdef HAVE_BACKTRACE
 991 ///     eCrash_Uninit();
 992         #endif
 993 }
 994
 995
 996
 997 pid_t current_child;
 998 void graceful_shutdown(int signum) {
 999         kill(current_child, signum);
1000         unlink(file_pid_file);
1001         exit(0);
1002 }
1003
1004 int nFireUps = 0;
1005 int nFireUpsNonRestart = 0;
1006 pid_t ForkedPid = 1;
1007
1008 /*
1009  * Start running as a daemon.
1010  */
1011 void start_daemon(int unused) {
1012         int status = 0;
1013         pid_t child = 0;
1014         FILE *fp;
1015         int do_restart = 0;
1016
1017         current_child = 0;
1018
1019         /* Close stdin/stdout/stderr and replace them with /dev/null.
1020          * We don't just call close() because we don't want these fd's
1021          * to be reused for other files.
1022          */
1023         if (chdir(ctdl_run_dir) != 0)
1024                 syslog(LOG_EMERG,
1025                               "unable to change into directory [%s]: %s",
1026                               ctdl_run_dir, strerror(errno));
1027
1028         child = fork();
1029         if (child != 0) {
1030                 exit(0);
1031         }
1032
1033         signal(SIGHUP, SIG_IGN);
1034         signal(SIGINT, SIG_IGN);
1035         signal(SIGQUIT, SIG_IGN);
1036
1037         setsid();
1038         umask(0);
1039         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1040             (freopen("/dev/null", "w", stdout) != stdout) ||
1041             (freopen("/dev/null", "w", stderr) != stderr))
1042                 syslog(LOG_EMERG,
1043                               "unable to reopen stdin/out/err %s",
1044                               strerror(errno));
1045
1046
1047         do {
1048                 current_child = fork();
1049
1050                 signal(SIGTERM, graceful_shutdown);
1051
1052                 if (current_child < 0) {
1053                         perror("fork");
1054                         exit(errno);
1055                 }
1056
1057                 else if (current_child == 0) {
1058                         return; /* continue starting citadel. */
1059                 }
1060
1061                 else {
1062                         fp = fopen(file_pid_file, "w");
1063                         if (fp != NULL) {
1064                                 fprintf(fp, ""F_PID_T"\n", getpid());
1065                                 fclose(fp);
1066                         }
1067                         waitpid(current_child, &status, 0);
1068                 }
1069                 do_restart = 0;
1070                 nFireUpsNonRestart = nFireUps;
1071
1072                 /* Exit code 0 means the watcher should exit */
1073                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1074                         do_restart = 0;
1075                 }
1076
1077                 /* Exit code 101-109 means the watcher should exit */
1078                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1079                         do_restart = 0;
1080                 }
1081
1082                 /* Any other exit code, or no exit code, means we should restart. */
1083                 else {
1084                         do_restart = 1;
1085                         nFireUps++;
1086                         ForkedPid = current_child;
1087                 }
1088
1089         } while (do_restart);
1090
1091         unlink(file_pid_file);
1092         exit(WEXITSTATUS(status));
1093 }
1094
1095
1096
1097 void checkcrash(void)
1098 {
1099         if (nFireUpsNonRestart != nFireUps)
1100         {
1101                 StrBuf *CrashMail;
1102
1103                 CrashMail = NewStrBuf();
1104                 syslog(LOG_ALERT, "Posting crash message\n");
1105                 StrBufPrintf(CrashMail,
1106                         " \n"
1107                         " The Citadel server process (citserver) terminated unexpectedly."
1108                         "\n \n"
1109                         " This could be the result of a bug in the server program, or some external "
1110                         "factor.\n \n"
1111                         " You can obtain more information about this by enabling core dumps.\n \n"
1112                         " For more information, please see:\n \n"
1113                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1114                         "\n \n"
1115
1116                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1117                         ,
1118                         ctdl_run_dir, ForkedPid);
1119                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1120                 FreeStrBuf(&CrashMail);
1121         }
1122 }
1123
1124
1125 /*
1126  * Generic routine to convert a login name to a full name (gecos)
1127  * Returns nonzero if a conversion took place
1128  */
1129 int convert_login(char NameToConvert[]) {
1130         struct passwd *pw;
1131         int a;
1132
1133         pw = getpwnam(NameToConvert);
1134         if (pw == NULL) {
1135                 return(0);
1136         }
1137         else {
1138                 strcpy(NameToConvert, pw->pw_gecos);
1139                 for (a=0; a<strlen(NameToConvert); ++a) {
1140                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1141                 }
1142                 return(1);
1143         }
1144 }
1145
1146
1147
1148 /*
1149  * This loop just keeps going and going and going...
1150  */
1151 /*
1152  * FIXME:
1153  * This current implimentation of worker_thread creates a bottle neck in several situations
1154  * The first thing to remember is that a single thread can handle more than one connection at a time.
1155  * More threads mean less memory for the system to run in.
1156  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1157  * something to happen anywhere.
1158  * This current implimentation requires worker threads to wait in other locations, after it has
1159  * been committed to a single connection which is very wasteful.
1160  * As an extreme case consider this:
1161  * A slow client connects and this slow client sends only one character each second.
1162  * With this current implimentation a single worker thread is dispatched to handle that connection
1163  * until such times as the client timeout expires, an error occurs on the socket or the client
1164  * completes its transmission.
1165  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1166  * second interval between chars.
1167  *
1168  * It is my intention to re-write this code and the associated client_getln, client_read functions
1169  * to allow any thread to read data on behalf of any connection (context).
1170  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1171  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1172  * process it.
1173  * This worker thread loop also needs to be able to handle binary data.
1174  */
1175
1176 void *worker_thread(void *arg) {
1177         int highest;
1178         CitContext *ptr;
1179         CitContext *bind_me = NULL;
1180         fd_set readfds;
1181         int retval = 0;
1182         struct timeval tv;
1183         int force_purge = 0;
1184
1185
1186         while (!CtdlThreadCheckStop()) {
1187
1188                 /* make doubly sure we're not holding any stale db handles
1189                  * which might cause a deadlock.
1190                  */
1191                 cdb_check_handles();
1192 do_select:      force_purge = 0;
1193                 bind_me = NULL;         /* Which session shall we handle? */
1194
1195                 /* Initialize the fdset. */
1196                 FD_ZERO(&readfds);
1197                 highest = 0;
1198
1199                 begin_critical_section(S_SESSION_TABLE);
1200                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1201                         int client_socket;
1202                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1203                             continue;
1204                         client_socket = ptr->client_socket;
1205                         /* Dont select on dead sessions only truly idle ones */
1206                         if ((ptr->state == CON_IDLE) &&
1207                             (CC->kill_me == 0) &&
1208                             (client_socket > 0))
1209                         {
1210                                 FD_SET(client_socket, &readfds);
1211                                 if (client_socket > highest)
1212                                         highest = client_socket;
1213                         }
1214                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1215                                 bind_me = ptr;
1216                                 ptr->state = CON_EXECUTING;
1217                                 break;
1218                         }
1219                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1220                                 bind_me = ptr;
1221                                 ptr->state = CON_STARTING;
1222                                 break;
1223                         }
1224                 }
1225                 end_critical_section(S_SESSION_TABLE);
1226
1227                 if (bind_me) {
1228                         goto SKIP_SELECT;
1229                 }
1230
1231                 /* If we got this far, it means that there are no sessions
1232                  * which a previous thread marked for attention, so we go
1233                  * ahead and get ready to select().
1234                  */
1235
1236                 if (!CtdlThreadCheckStop()) {
1237                         tv.tv_sec = 1;          /* wake up every second if no input */
1238                         tv.tv_usec = 0;
1239                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1240                 }
1241                 else
1242                         return NULL;
1243
1244                 /* Now figure out who made this select() unblock.
1245                  * First, check for an error or exit condition.
1246                  */
1247                 if (retval < 0) {
1248                         if (errno == EBADF) {
1249                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1250                                         strerror(errno));
1251                                 goto do_select;
1252                         }
1253                         if (errno != EINTR) {
1254                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1255                                 CtdlThreadStopAll();
1256                                 continue;
1257                         } else {
1258 #if 0
1259                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1260 #endif
1261                                 if (CtdlThreadCheckStop()) return(NULL);
1262                                 goto do_select;
1263                         }
1264                 }
1265                 else if(retval == 0) {
1266                         if (CtdlThreadCheckStop()) return(NULL);
1267                 }
1268
1269                 /* It must be a client socket.  Find a context that has data
1270                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1271                  * active sockets other than our chosen one are marked as
1272                  * CON_READY so the next thread that comes around can just bind
1273                  * to one without having to select() again.
1274                  */
1275                 begin_critical_section(S_SESSION_TABLE);
1276                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1277                         int checkfd = ptr->client_socket;
1278                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1279                                 if (FD_ISSET(checkfd, &readfds)) {
1280                                         ptr->input_waiting = 1;
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                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1289                                         if (!bind_me) {
1290                                                 bind_me = ptr;  /* I choose you! */
1291                                                 bind_me->state = CON_EXECUTING;
1292                                         }
1293                                         else {
1294                                                 ptr->state = CON_READY;
1295                                         }
1296                                 }
1297                         }
1298                 }
1299                 end_critical_section(S_SESSION_TABLE);
1300
1301 SKIP_SELECT:
1302                 /* We're bound to a session */
1303                 if (bind_me != NULL) {
1304                         become_session(bind_me);
1305
1306                         if (bind_me->state == CON_STARTING) {
1307                                 bind_me->state = CON_EXECUTING;
1308                                 begin_session(bind_me);
1309                                 bind_me->h_greeting_function();
1310                         }
1311                         /* If the client has sent a command, execute it. */
1312                         if (CC->input_waiting) {
1313                                 CC->h_command_function();
1314
1315                                 while (HaveMoreLinesWaiting(CC))
1316                                        CC->h_command_function();
1317
1318                                 CC->input_waiting = 0;
1319                         }
1320
1321                         /* If there are asynchronous messages waiting and the
1322                          * client supports it, do those now */
1323                         if ((CC->is_async) && (CC->async_waiting)
1324                            && (CC->h_async_function != NULL)) {
1325                                 CC->h_async_function();
1326                                 CC->async_waiting = 0;
1327                         }
1328
1329                         force_purge = CC->kill_me;
1330                         become_session(NULL);
1331                         bind_me->state = CON_IDLE;
1332                 }
1333
1334                 dead_session_purge(force_purge);
1335                 do_housekeeping();
1336         }
1337         /* If control reaches this point, the server is shutting down */
1338         return(NULL);
1339 }
1340
1341
1342
1343
1344 /*
1345  * A function to handle selecting on master sockets.
1346  * In other words it handles new connections.
1347  * It is a thread.
1348  */
1349 void *select_on_master (void *arg)
1350 {
1351         struct ServiceFunctionHook *serviceptr;
1352         fd_set master_fds;
1353         int highest;
1354         struct timeval tv;
1355         int ssock;                      /* Descriptor for client socket */
1356         CitContext *con= NULL;  /* Temporary context pointer */
1357         int m;
1358         int i;
1359         int retval;
1360         struct CitContext select_on_master_CC;
1361
1362         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1363         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1364
1365         while (!CtdlThreadCheckStop()) {
1366                 /* Initialize the fdset. */
1367                 FD_ZERO(&master_fds);
1368                 highest = 0;
1369
1370                 /* First, add the various master sockets to the fdset. */
1371                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1372                 serviceptr = serviceptr->next ) {
1373                         m = serviceptr->msock;
1374                         FD_SET(m, &master_fds);
1375                         if (m > highest) {
1376                                 highest = m;
1377                         }
1378                 }
1379
1380                 if (!CtdlThreadCheckStop()) {
1381                         tv.tv_sec = 60;         /* wake up every second if no input */
1382                         tv.tv_usec = 0;
1383                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1384                 }
1385                 else
1386                         return NULL;
1387
1388                 /* Now figure out who made this select() unblock.
1389                  * First, check for an error or exit condition.
1390                  */
1391                 if (retval < 0) {
1392                         if (errno == EBADF) {
1393                                 syslog(LOG_NOTICE, "select() failed: (%s)\n",
1394                                         strerror(errno));
1395                                 continue;
1396                         }
1397                         if (errno != EINTR) {
1398                                 syslog(LOG_EMERG, "Exiting (%s)\n", strerror(errno));
1399                                 CtdlThreadStopAll();
1400                         } else {
1401 #if 0
1402                                 syslog(LOG_DEBUG, "Interrupted CtdlThreadSelect.\n");
1403 #endif
1404                                 if (CtdlThreadCheckStop()) return(NULL);
1405                                 continue;
1406                         }
1407                 }
1408                 else if(retval == 0) {
1409                         if (CtdlThreadCheckStop()) return(NULL);
1410                         continue;
1411                 }
1412                 /* Next, check to see if it's a new client connecting
1413                  * on a master socket.
1414                  */
1415                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1416                      serviceptr = serviceptr->next ) {
1417
1418                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1419                                 ssock = accept(serviceptr->msock, NULL, 0);
1420                                 if (ssock >= 0) {
1421                                         syslog(LOG_DEBUG,
1422                                                 "New client socket %d\n",
1423                                                 ssock);
1424
1425                                         /* The master socket is non-blocking but the client
1426                                          * sockets need to be blocking, otherwise certain
1427                                          * operations barf on FreeBSD.  Not a fatal error.
1428                                          */
1429                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1430                                                 syslog(LOG_EMERG,
1431                                                         "citserver: Can't set socket to blocking: %s\n",
1432                                                         strerror(errno));
1433                                         }
1434
1435                                         /* New context will be created already
1436                                          * set up in the CON_EXECUTING state.
1437                                          */
1438                                         con = CreateNewContext();
1439
1440                                         /* Assign our new socket number to it. */
1441                                         con->client_socket = ssock;
1442                                         con->h_command_function =
1443                                                 serviceptr->h_command_function;
1444                                         con->h_async_function =
1445                                                 serviceptr->h_async_function;
1446                                         con->h_greeting_function = serviceptr->h_greeting_function;
1447                                         con->ServiceName =
1448                                                 serviceptr->ServiceName;
1449
1450                                         /* Determine whether it's a local socket */
1451                                         if (serviceptr->sockpath != NULL)
1452                                                 con->is_local_socket = 1;
1453
1454                                         /* Set the SO_REUSEADDR socket option */
1455                                         i = 1;
1456                                         setsockopt(ssock, SOL_SOCKET,
1457                                                 SO_REUSEADDR,
1458                                                 &i, sizeof(i));
1459
1460                                         con->state = CON_GREETING;
1461
1462                                         retval--;
1463                                         if (retval == 0)
1464                                                 break;
1465                                 }
1466                         }
1467                 }
1468         }
1469         CtdlClearSystemContext();
1470
1471         return NULL;
1472 }
1473
1474
1475
1476 /*
1477  * SyslogFacility()
1478  * Translate text facility name to syslog.h defined value.
1479  */
1480 int SyslogFacility(char *name)
1481 {
1482         int i;
1483         struct
1484         {
1485                 int facility;
1486                 char *name;
1487         }   facTbl[] =
1488         {
1489                 {   LOG_KERN,   "kern"          },
1490                 {   LOG_USER,   "user"          },
1491                 {   LOG_MAIL,   "mail"          },
1492                 {   LOG_DAEMON, "daemon"        },
1493                 {   LOG_AUTH,   "auth"          },
1494                 {   LOG_SYSLOG, "syslog"        },
1495                 {   LOG_LPR,    "lpr"           },
1496                 {   LOG_NEWS,   "news"          },
1497                 {   LOG_UUCP,   "uucp"          },
1498                 {   LOG_LOCAL0, "local0"        },
1499                 {   LOG_LOCAL1, "local1"        },
1500                 {   LOG_LOCAL2, "local2"        },
1501                 {   LOG_LOCAL3, "local3"        },
1502                 {   LOG_LOCAL4, "local4"        },
1503                 {   LOG_LOCAL5, "local5"        },
1504                 {   LOG_LOCAL6, "local6"        },
1505                 {   LOG_LOCAL7, "local7"        },
1506                 {   0,            NULL          }
1507         };
1508         for(i = 0; facTbl[i].name != NULL; i++) {
1509                 if(!strcasecmp(name, facTbl[i].name))
1510                         return facTbl[i].facility;
1511         }
1512         return LOG_DAEMON;
1513 }
1514
1515
1516 /********** MEM CHEQQER ***********/
1517
1518 #ifdef DEBUG_MEMORY_LEAKS
1519
1520 #undef malloc
1521 #undef realloc
1522 #undef strdup
1523 #undef free
1524
1525 void *tracked_malloc(size_t size, char *file, int line) {
1526         struct igheap *thisheap;
1527         void *block;
1528
1529         block = malloc(size);
1530         if (block == NULL) return(block);
1531
1532         thisheap = malloc(sizeof(struct igheap));
1533         if (thisheap == NULL) {
1534                 free(block);
1535                 return(NULL);
1536         }
1537
1538         thisheap->block = block;
1539         strcpy(thisheap->file, file);
1540         thisheap->line = line;
1541
1542         begin_critical_section(S_DEBUGMEMLEAKS);
1543         thisheap->next = igheap;
1544         igheap = thisheap;
1545         end_critical_section(S_DEBUGMEMLEAKS);
1546
1547         return(block);
1548 }
1549
1550
1551 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1552         struct igheap *thisheap;
1553         void *block;
1554
1555         block = realloc(ptr, size);
1556         if (block == NULL) return(block);
1557
1558         thisheap = malloc(sizeof(struct igheap));
1559         if (thisheap == NULL) {
1560                 free(block);
1561                 return(NULL);
1562         }
1563
1564         thisheap->block = block;
1565         strcpy(thisheap->file, file);
1566         thisheap->line = line;
1567
1568         begin_critical_section(S_DEBUGMEMLEAKS);
1569         thisheap->next = igheap;
1570         igheap = thisheap;
1571         end_critical_section(S_DEBUGMEMLEAKS);
1572
1573         return(block);
1574 }
1575
1576
1577
1578 void tracked_free(void *ptr) {
1579         struct igheap *thisheap;
1580         struct igheap *trash;
1581
1582         free(ptr);
1583
1584         if (igheap == NULL) return;
1585         begin_critical_section(S_DEBUGMEMLEAKS);
1586         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1587                 if (thisheap->next != NULL) {
1588                         if (thisheap->next->block == ptr) {
1589                                 trash = thisheap->next;
1590                                 thisheap->next = thisheap->next->next;
1591                                 free(trash);
1592                         }
1593                 }
1594         }
1595         if (igheap->block == ptr) {
1596                 trash = igheap;
1597                 igheap = igheap->next;
1598                 free(trash);
1599         }
1600         end_critical_section(S_DEBUGMEMLEAKS);
1601 }
1602
1603 char *tracked_strdup(const char *s, char *file, int line) {
1604         char *ptr;
1605
1606         if (s == NULL) return(NULL);
1607         ptr = tracked_malloc(strlen(s) + 1, file, line);
1608         if (ptr == NULL) return(NULL);
1609         strncpy(ptr, s, strlen(s));
1610         return(ptr);
1611 }
1612
1613 void dump_heap(void) {
1614         struct igheap *thisheap;
1615
1616         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1617                 syslog(LOG_CRIT, "UNFREED: %30s : %d\n",
1618                         thisheap->file, thisheap->line);
1619         }
1620 }
1621
1622 #endif /*  DEBUG_MEMORY_LEAKS */