citadel/sysdep.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel "system dependent" stuff.
   5  * See COPYING for copyright information.
   6  *
   7  * Here's where we (hopefully) have most parts of the Citadel server that
   8  * would need to be altered to run the server in a non-POSIX environment.
   9  *
  10  * If we ever port to a different platform and either have multiple
  11  * variants of this file or simply load it up with #ifdefs.
  12  *
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <sys/wait.h>
  25 #include <sys/socket.h>
  26 #include <syslog.h>
  27 #include <sys/syslog.h>
  28
  29 #if TIME_WITH_SYS_TIME
  30 # include <sys/time.h>
  31 # include <time.h>
  32 #else
  33 # if HAVE_SYS_TIME_H
  34 #  include <sys/time.h>
  35 # else
  36 #  include <time.h>
  37 # endif
  38 #endif
  39
  40 #include <limits.h>
  41 #include <sys/resource.h>
  42 #include <netinet/in.h>
  43 #include <netinet/tcp.h>
  44 #include <arpa/inet.h>
  45 #include <netdb.h>
  46 #include <sys/un.h>
  47 #include <string.h>
  48 #include <pwd.h>
  49 #include <errno.h>
  50 #include <stdarg.h>
  51 #include <grp.h>
  52 #include <libcitadel.h>
  53 #include "citadel.h"
  54 #include "server.h"
  55 #include "sysdep_decls.h"
  56 #include "citserver.h"
  57 #include "support.h"
  58 #include "config.h"
  59 #include "database.h"
  60 #include "housekeeping.h"
  61 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  62 #include "ecrash.h"
  63 #include "context.h"
  64
  65 #ifdef HAVE_SYS_SELECT_H
  66 #include <sys/select.h>
  67 #endif
  68
  69 #ifndef HAVE_SNPRINTF
  70 #include "snprintf.h"
  71 #endif
  72
  73 #include "ctdl_module.h"
  74 #include "threads.h"
  75 #include "user_ops.h"
  76 #include "control.h"
  77
  78
  79 #ifdef DEBUG_MEMORY_LEAKS
  80 struct igheap {
  81         struct igheap *next;
  82         char file[32];
  83         int line;
  84         void *block;
  85 };
  86
  87 struct igheap *igheap = NULL;
  88 #endif
  89
  90
  91 int verbosity = DEFAULT_VERBOSITY;              /* Logging level */
  92
  93 int syslog_facility = LOG_DAEMON;
  94 int enable_syslog = 0;
  95
  96
  97 /*
  98  * CtdlLogPrintf()  ...   Write logging information
  99  */
 100 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...) {
 101         va_list arg_ptr;
 102         va_start(arg_ptr, format);
 103         vCtdlLogPrintf(loglevel, format, arg_ptr);
 104         va_end(arg_ptr);
 105 }
 106
 107 void vCtdlLogPrintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 108 {
 109         char buf[SIZ], buf2[SIZ];
 110
 111         if (enable_syslog) {
 112                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 113         }
 114
 115         /* stderr output code */
 116         if (enable_syslog || running_as_daemon) return;
 117
 118         /* if we run in forground and syslog is disabled, log to terminal */
 119         if (loglevel <= verbosity) {
 120                 struct timeval tv;
 121                 struct tm tim;
 122                 time_t unixtime;
 123                 CitContext *CCC = CC;
 124
 125                 gettimeofday(&tv, NULL);
 126                 /* Promote to time_t; types differ on some OSes (like darwin) */
 127                 unixtime = tv.tv_sec;
 128                 localtime_r(&unixtime, &tim);
 129                 if ((CCC != NULL) && (CCC->cs_pid != 0)) {
 130                         sprintf(buf,
 131                                 "%04d/%02d/%02d %2d:%02d:%02d.%06ld [%3d] ",
 132                                 tim.tm_year + 1900, tim.tm_mon + 1,
 133                                 tim.tm_mday, tim.tm_hour, tim.tm_min,
 134                                 tim.tm_sec, (long)tv.tv_usec,
 135                                 CCC->cs_pid);
 136                 } else {
 137                         sprintf(buf,
 138                                 "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 139                                 tim.tm_year + 1900, tim.tm_mon + 1,
 140                                 tim.tm_mday, tim.tm_hour, tim.tm_min,
 141                                 tim.tm_sec, (long)tv.tv_usec);
 142                 }
 143                 vsnprintf(buf2, SIZ, format, arg_ptr);
 144
 145                 fprintf(stderr, "%s%s", buf, buf2);
 146                 fflush(stderr);
 147         }
 148 }
 149
 150
 151
 152 /*
 153  * Signal handler to shut down the server.
 154  */
 155
 156 volatile int exit_signal = 0;
 157 volatile int shutdown_and_halt = 0;
 158 volatile int restart_server = 0;
 159 volatile int running_as_daemon = 0;
 160
 161 static RETSIGTYPE signal_cleanup(int signum) {
 162
 163         if (CT)
 164                 CT->signal = signum;
 165         else
 166         {
 167                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 168                 exit_signal = signum;
 169         }
 170 }
 171
 172
 173
 174 /*
 175  * Some initialization stuff...
 176  */
 177 void init_sysdep(void) {
 178         sigset_t set;
 179
 180         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 181 #ifdef FD_SETSIZE
 182 #ifdef RLIMIT_NOFILE
 183         struct rlimit rl;
 184         getrlimit(RLIMIT_NOFILE, &rl);
 185         rl.rlim_cur = FD_SETSIZE;
 186         rl.rlim_max = FD_SETSIZE;
 187         setrlimit(RLIMIT_NOFILE, &rl);
 188 #endif
 189 #endif
 190
 191         /* If we've got OpenSSL, we're going to use it. */
 192 #ifdef HAVE_OPENSSL
 193         init_ssl();
 194 #endif
 195
 196         /*
 197          * Set up a place to put thread-specific data.
 198          * We only need a single pointer per thread - it points to the
 199          * CitContext structure (in the ContextList linked list) of the
 200          * session to which the calling thread is currently bound.
 201          */
 202         if (citthread_key_create(&MyConKey, NULL) != 0) {
 203                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 204                         strerror(errno));
 205         }
 206
 207         /*
 208          * The action for unexpected signals and exceptions should be to
 209          * call signal_cleanup() to gracefully shut down the server.
 210          */
 211         sigemptyset(&set);
 212         sigaddset(&set, SIGINT);
 213         sigaddset(&set, SIGQUIT);
 214         sigaddset(&set, SIGHUP);
 215         sigaddset(&set, SIGTERM);
 216         // sigaddset(&set, SIGSEGV);    commented out because
 217         // sigaddset(&set, SIGILL);     we want core dumps
 218         // sigaddset(&set, SIGBUS);
 219         sigprocmask(SIG_UNBLOCK, &set, NULL);
 220
 221         signal(SIGINT, signal_cleanup);
 222         signal(SIGQUIT, signal_cleanup);
 223         signal(SIGHUP, signal_cleanup);
 224         signal(SIGTERM, signal_cleanup);
 225         // signal(SIGSEGV, signal_cleanup);     commented out because
 226         // signal(SIGILL, signal_cleanup);      we want core dumps
 227         // signal(SIGBUS, signal_cleanup);
 228
 229         /*
 230          * Do not shut down the server on broken pipe signals, otherwise the
 231          * whole Citadel service would come down whenever a single client
 232          * socket breaks.
 233          */
 234         signal(SIGPIPE, SIG_IGN);
 235 }
 236
 237
 238
 239
 240 /*
 241  * This is a generic function to set up a master socket for listening on
 242  * a TCP port.  The server shuts down if the bind fails.
 243  *
 244  */
 245 int ig_tcp_server(char *ip_addr, int port_number, int queue_len, char **errormessage)
 246 {
 247         struct sockaddr_in sin;
 248         int s, i;
 249         int actual_queue_len;
 250
 251         actual_queue_len = queue_len;
 252         if (actual_queue_len < 5) actual_queue_len = 5;
 253
 254         memset(&sin, 0, sizeof(sin));
 255         sin.sin_family = AF_INET;
 256         sin.sin_port = htons((u_short)port_number);
 257         if (ip_addr == NULL) {
 258                 sin.sin_addr.s_addr = INADDR_ANY;
 259         }
 260         else {
 261                 sin.sin_addr.s_addr = inet_addr(ip_addr);
 262         }
 263
 264         if (sin.sin_addr.s_addr == !INADDR_ANY) {
 265                 sin.sin_addr.s_addr = INADDR_ANY;
 266         }
 267
 268         s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
 269
 270         if (s < 0) {
 271                 *errormessage = (char*) malloc(SIZ + 1);
 272                 snprintf(*errormessage, SIZ,
 273                                  "citserver: Can't create a socket: %s",
 274                                  strerror(errno));
 275                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 276                 return(-1);
 277         }
 278
 279         i = 1;
 280         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 281
 282         if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
 283                 *errormessage = (char*) malloc(SIZ + 1);
 284                 snprintf(*errormessage, SIZ,
 285                                  "citserver: Can't bind: %s",
 286                                  strerror(errno));
 287                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 288                 close(s);
 289                 return(-1);
 290         }
 291
 292         /* set to nonblock - we need this for some obscure situations */
 293         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 294                 *errormessage = (char*) malloc(SIZ + 1);
 295                 snprintf(*errormessage, SIZ,
 296                                  "citserver: Can't set socket to non-blocking: %s",
 297                                  strerror(errno));
 298                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 299                 close(s);
 300                 return(-1);
 301         }
 302
 303         if (listen(s, actual_queue_len) < 0) {
 304                 *errormessage = (char*) malloc(SIZ + 1);
 305                 snprintf(*errormessage, SIZ,
 306                                  "citserver: Can't listen: %s",
 307                                  strerror(errno));
 308                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 309                 close(s);
 310                 return(-1);
 311         }
 312
 313         return(s);
 314 }
 315
 316
 317
 318 /*
 319  * Create a Unix domain socket and listen on it
 320  */
 321 int ig_uds_server(char *sockpath, int queue_len, char **errormessage)
 322 {
 323         struct sockaddr_un addr;
 324         int s;
 325         int i;
 326         int actual_queue_len;
 327 #ifdef HAVE_STRUCT_UCRED
 328         int passcred = 1;
 329 #endif
 330
 331         actual_queue_len = queue_len;
 332         if (actual_queue_len < 5) actual_queue_len = 5;
 333
 334         i = unlink(sockpath);
 335         if ((i != 0) && (errno != ENOENT)) {
 336                 *errormessage = (char*) malloc(SIZ + 1);
 337                 snprintf(*errormessage, SIZ, "citserver: can't unlink %s: %s",
 338                         sockpath, strerror(errno));
 339                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 340                 return(-1);
 341         }
 342
 343         memset(&addr, 0, sizeof(addr));
 344         addr.sun_family = AF_UNIX;
 345         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 346
 347         s = socket(AF_UNIX, SOCK_STREAM, 0);
 348         if (s < 0) {
 349                 *errormessage = (char*) malloc(SIZ + 1);
 350                 snprintf(*errormessage, SIZ,
 351                          "citserver: Can't create a socket: %s",
 352                          strerror(errno));
 353                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 354                 return(-1);
 355         }
 356
 357         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 358                 *errormessage = (char*) malloc(SIZ + 1);
 359                 snprintf(*errormessage, SIZ,
 360                          "citserver: Can't bind: %s",
 361                          strerror(errno));
 362                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 363                 return(-1);
 364         }
 365
 366         /* set to nonblock - we need this for some obscure situations */
 367         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 368                 *errormessage = (char*) malloc(SIZ + 1);
 369                 snprintf(*errormessage, SIZ,
 370                          "citserver: Can't set socket to non-blocking: %s",
 371                          strerror(errno));
 372                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 373                 close(s);
 374                 return(-1);
 375         }
 376
 377         if (listen(s, actual_queue_len) < 0) {
 378                 *errormessage = (char*) malloc(SIZ + 1);
 379                 snprintf(*errormessage, SIZ,
 380                          "citserver: Can't listen: %s",
 381                          strerror(errno));
 382                 CtdlLogPrintf(CTDL_EMERG, "%s\n", *errormessage);
 383                 return(-1);
 384         }
 385
 386 #ifdef HAVE_STRUCT_UCRED
 387         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 388 #endif
 389
 390         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 391         return(s);
 392 }
 393
 394
 395
 396 /*
 397  * The following functions implement output buffering on operating systems which
 398  * support it (such as Linux and various BSD flavors).
 399  */
 400 #ifndef HAVE_DARWIN
 401 #ifdef TCP_CORK
 402 #       define HAVE_TCP_BUFFERING
 403 #else
 404 #       ifdef TCP_NOPUSH
 405 #               define HAVE_TCP_BUFFERING
 406 #               define TCP_CORK TCP_NOPUSH
 407 #       endif
 408 #endif /* TCP_CORK */
 409 #endif /* HAVE_DARWIN */
 410
 411 static unsigned on = 1, off = 0;
 412
 413 void buffer_output(void) {
 414 #ifdef HAVE_TCP_BUFFERING
 415 #ifdef HAVE_OPENSSL
 416         if (!CC->redirect_ssl)
 417 #endif
 418                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 419 #endif
 420 }
 421
 422 void unbuffer_output(void) {
 423 #ifdef HAVE_TCP_BUFFERING
 424 #ifdef HAVE_OPENSSL
 425         if (!CC->redirect_ssl)
 426 #endif
 427                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 428 #endif
 429 }
 430
 431 void flush_output(void) {
 432 #ifdef HAVE_TCP_BUFFERING
 433         struct CitContext *CCC = CC;
 434         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 435         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 436 #endif
 437 }
 438
 439 static void flush_client_inbuf(void)
 440 {
 441         CitContext *CCC=CC;
 442
 443         FlushStrBuf(CCC->ReadBuf);
 444         CCC->Pos = NULL;
 445
 446 }
 447
 448 /*
 449  * client_write()   ...    Send binary data to the client.
 450  */
 451 int client_write(const char *buf, int nbytes)
 452 {
 453         int bytes_written = 0;
 454         int retval;
 455 #ifndef HAVE_TCP_BUFFERING
 456         int old_buffer_len = 0;
 457 #endif
 458         fd_set wset;
 459         CitContext *Ctx;
 460         int fdflags;
 461
 462         flush_client_inbuf();
 463         Ctx = CC;
 464         if (Ctx->redirect_buffer != NULL) {
 465                 if ((Ctx->redirect_len + nbytes + 2) >= Ctx->redirect_alloc) {
 466                         Ctx->redirect_alloc = (Ctx->redirect_alloc * 2) + nbytes;
 467                         Ctx->redirect_buffer = realloc(Ctx->redirect_buffer,
 468                                                 Ctx->redirect_alloc);
 469                 }
 470                 memcpy(&Ctx->redirect_buffer[Ctx->redirect_len], buf, nbytes);
 471                 Ctx->redirect_len += nbytes;
 472                 Ctx->redirect_buffer[Ctx->redirect_len] = 0;
 473                 return 0;
 474         }
 475
 476 #ifdef HAVE_OPENSSL
 477         if (Ctx->redirect_ssl) {
 478                 client_write_ssl(buf, nbytes);
 479                 return 0;
 480         }
 481 #endif
 482         if (Ctx->client_socket == -1) return -1;
 483
 484         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 485
 486         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 487                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 488                         FD_ZERO(&wset);
 489                         FD_SET(Ctx->client_socket, &wset);
 490                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 491                                 if (errno == EINTR)
 492                                 {
 493                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 494                                         if (CtdlThreadCheckStop()) {
 495                                                 CC->kill_me = 1;
 496                                                 return (-1);
 497                                         } else {
 498                                                 /* can't trust fd's and stuff so we need to re-create them */
 499                                                 continue;
 500                                         }
 501                                 } else {
 502                                         CtdlLogPrintf(CTDL_ERR,
 503                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 504                                                 nbytes - bytes_written,
 505                                                 strerror(errno), errno);
 506                                         cit_backtrace();
 507                                         Ctx->kill_me = 1;
 508                                         return -1;
 509                                 }
 510                         }
 511                 }
 512
 513                 retval = write(Ctx->client_socket, &buf[bytes_written],
 514                         nbytes - bytes_written);
 515                 if (retval < 1) {
 516                         CtdlLogPrintf(CTDL_ERR,
 517                                 "client_write(%d bytes) failed: %s (%d)\n",
 518                                 nbytes - bytes_written,
 519                                 strerror(errno), errno);
 520                         cit_backtrace();
 521                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 522                         Ctx->kill_me = 1;
 523                         return -1;
 524                 }
 525                 bytes_written = bytes_written + retval;
 526         }
 527         return 0;
 528 }
 529
 530 void cputbuf(const StrBuf *Buf) {
 531         client_write(ChrPtr(Buf), StrLength(Buf));
 532 }
 533
 534
 535 /*
 536  * cprintf()    Send formatted printable data to the client.
 537  *              Implemented in terms of client_write() so it's technically not sysdep...
 538  */
 539 void cprintf(const char *format, ...) {
 540         va_list arg_ptr;
 541         char buf[1024];
 542
 543         va_start(arg_ptr, format);
 544         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 545                 buf[sizeof buf - 2] = '\n';
 546         client_write(buf, strlen(buf));
 547         va_end(arg_ptr);
 548 }
 549
 550
 551 /*
 552  * Read data from the client socket.
 553  *
 554  * sock         socket fd to read from
 555  * buf          buffer to read into
 556  * bytes        number of bytes to read
 557  * timeout      Number of seconds to wait before timing out
 558  *
 559  * Possible return values:
 560  *      1       Requested number of bytes has been read.
 561  *      0       Request timed out.
 562  *      -1      Connection is broken, or other error.
 563  */
 564 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 565 {
 566         CitContext *CCC=CC;
 567         const char *Error;
 568         int retval = 0;
 569
 570 #ifdef HAVE_OPENSSL
 571         if (CCC->redirect_ssl) {
 572                 retval = client_read_sslblob(Target, bytes, timeout);
 573         }
 574         else
 575 #endif
 576
 577                 retval = StrBufReadBLOBBuffered(Target,
 578                                                 CCC->ReadBuf,
 579                                                 &CCC->Pos,
 580                                                 &CCC->client_socket,
 581                                                 1,
 582                                                 bytes,
 583                                                 O_TERM,
 584                                                 &Error);
 585         if (retval < 0) {
 586                 CtdlLogPrintf(CTDL_CRIT,
 587                               "%s failed: %s\n",
 588                               __FUNCTION__,
 589                               Error);
 590         }
 591         return retval;
 592 }
 593
 594 int client_read_to(char *buf, int bytes, int timeout)
 595 {
 596         CitContext *CCC=CC;
 597         int rc;
 598
 599         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 600         if (rc < 0)
 601         {
 602                 *buf = '\0';
 603                 return rc;
 604         }
 605         else
 606         {
 607                 memcpy(buf,
 608                        ChrPtr(CCC->MigrateBuf),
 609                        StrLength(CCC->MigrateBuf) + 1);
 610                 FlushStrBuf(CCC->MigrateBuf);
 611                 return rc;
 612         }
 613 }
 614
 615
 616 int HaveMoreLinesWaiting(CitContext *CCC)
 617 {
 618         if ((CCC->Pos == NULL) && (StrLength(CCC->ReadBuf) == 0))
 619                 return 0;
 620         else
 621                 return 1;
 622 }
 623
 624
 625 /*
 626  * Read data from the client socket with default timeout.
 627  * (This is implemented in terms of client_read_to() and could be
 628  * justifiably moved out of sysdep.c)
 629  */
 630 INLINE int client_read(char *buf, int bytes)
 631 {
 632         return(client_read_to(buf, bytes, config.c_sleeping));
 633 }
 634
 635 int CtdlClientGetLine(StrBuf *Target)
 636 {
 637         CitContext *CCC=CC;
 638         const char *Error;
 639         int rc;
 640
 641 #ifdef HAVE_OPENSSL
 642         if (CCC->redirect_ssl) {
 643                 return client_readline_sslbuffer(Target,
 644                                                  CCC->ReadBuf,
 645                                                  1);
 646         }
 647         else
 648 #endif
 649         {
 650                 rc = StrBufTCP_read_buffered_line_fast(Target,
 651                                                        CCC->ReadBuf,
 652                                                        &CCC->Pos,
 653                                                        &CCC->client_socket,
 654                                                        5,
 655                                                        1,
 656                                                        &Error);
 657                 if ((rc < 0) && (Error != NULL))
 658                         CtdlLogPrintf(CTDL_CRIT,
 659                                       "%s failed: %s\n",
 660                                       __FUNCTION__,
 661                                       Error);
 662                 return rc;
 663         }
 664 }
 665
 666
 667 /*
 668  * client_getln()   ...   Get a LF-terminated line of text from the client.
 669  * (This is implemented in terms of client_read() and could be
 670  * justifiably moved out of sysdep.c)
 671  */
 672 int client_getln(char *buf, int bufsize)
 673 {
 674         int i, retval;
 675         CitContext *CCC=CC;
 676         const char *pCh;
 677
 678         retval = CtdlClientGetLine(CCC->MigrateBuf);
 679
 680         i = StrLength(CCC->MigrateBuf);
 681         pCh = ChrPtr(CCC->MigrateBuf);
 682         /* Strip the trailing LF, and the trailing CR if present.
 683          */
 684         if (bufsize <= i)
 685                 i = bufsize - 1;
 686         while ( (i > 0)
 687                 && ( (pCh[i - 1]==13)
 688                      || ( pCh[i - 1]==10)) ) {
 689                 i--;
 690         }
 691         memcpy(buf, pCh, i);
 692         buf[i] = 0;
 693
 694         FlushStrBuf(CCC->MigrateBuf);
 695         if (retval < 0) {
 696                 safestrncpy(&buf[i], "000", bufsize - i);
 697         }
 698         return(retval >= 0);
 699 }
 700
 701
 702 /*
 703  * Cleanup any contexts that are left lying around
 704  */
 705
 706
 707 void close_masters (void)
 708 {
 709         struct ServiceFunctionHook *serviceptr;
 710
 711         /*
 712          * close all protocol master sockets
 713          */
 714         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 715             serviceptr = serviceptr->next ) {
 716
 717                 if (serviceptr->tcp_port > 0)
 718                 {
 719                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 720                                 serviceptr->tcp_port);
 721                         serviceptr->tcp_port = 0;
 722                 }
 723
 724                 if (serviceptr->sockpath != NULL)
 725                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 726                                 serviceptr->sockpath);
 727
 728                 close(serviceptr->msock);
 729                 /* If it's a Unix domain socket, remove the file. */
 730                 if (serviceptr->sockpath != NULL) {
 731                         unlink(serviceptr->sockpath);
 732                         serviceptr->sockpath = NULL;
 733                 }
 734         }
 735 }
 736
 737
 738 /*
 739  * The system-dependent part of master_cleanup() - close the master socket.
 740  */
 741 void sysdep_master_cleanup(void) {
 742
 743         close_masters();
 744
 745         context_cleanup();
 746
 747 #ifdef HAVE_OPENSSL
 748         destruct_ssl();
 749 #endif
 750         CtdlDestroyProtoHooks();
 751         CtdlDestroyDeleteHooks();
 752         CtdlDestroyXmsgHooks();
 753         CtdlDestroyNetprocHooks();
 754         CtdlDestroyUserHooks();
 755         CtdlDestroyMessageHook();
 756         CtdlDestroyCleanupHooks();
 757         CtdlDestroyFixedOutputHooks();
 758         CtdlDestroySessionHooks();
 759         CtdlDestroyServiceHook();
 760         CtdlDestroyRoomHooks();
 761         #ifdef HAVE_BACKTRACE
 762 ///     eCrash_Uninit();
 763         #endif
 764 }
 765
 766
 767
 768 pid_t current_child;
 769 void graceful_shutdown(int signum) {
 770         kill(current_child, signum);
 771         unlink(file_pid_file);
 772         exit(0);
 773 }
 774
 775 int nFireUps = 0;
 776 int nFireUpsNonRestart = 0;
 777 pid_t ForkedPid = 1;
 778
 779 /*
 780  * Start running as a daemon.
 781  */
 782 void start_daemon(int unused) {
 783         int status = 0;
 784         pid_t child = 0;
 785         FILE *fp;
 786         int do_restart = 0;
 787
 788         current_child = 0;
 789
 790         /* Close stdin/stdout/stderr and replace them with /dev/null.
 791          * We don't just call close() because we don't want these fd's
 792          * to be reused for other files.
 793          */
 794         if (chdir(ctdl_run_dir) != 0)
 795                 CtdlLogPrintf(CTDL_EMERG,
 796                               "unable to change into directory [%s]: %s",
 797                               ctdl_run_dir, strerror(errno));
 798
 799         child = fork();
 800         if (child != 0) {
 801                 exit(0);
 802         }
 803
 804         signal(SIGHUP, SIG_IGN);
 805         signal(SIGINT, SIG_IGN);
 806         signal(SIGQUIT, SIG_IGN);
 807
 808         setsid();
 809         umask(0);
 810         if ((freopen("/dev/null", "r", stdin) != stdin) ||
 811             (freopen("/dev/null", "w", stdout) != stdout) ||
 812             (freopen("/dev/null", "w", stderr) != stderr))
 813                 CtdlLogPrintf(CTDL_EMERG,
 814                               "unable to reopen stdin/out/err %s",
 815                               strerror(errno));
 816
 817
 818         do {
 819                 current_child = fork();
 820
 821                 signal(SIGTERM, graceful_shutdown);
 822
 823                 if (current_child < 0) {
 824                         perror("fork");
 825                         exit(errno);
 826                 }
 827
 828                 else if (current_child == 0) {
 829                         return; /* continue starting citadel. */
 830                 }
 831
 832                 else {
 833                         fp = fopen(file_pid_file, "w");
 834                         if (fp != NULL) {
 835                                 fprintf(fp, ""F_PID_T"\n", getpid());
 836                                 fclose(fp);
 837                         }
 838                         waitpid(current_child, &status, 0);
 839                 }
 840                 do_restart = 0;
 841                 nFireUpsNonRestart = nFireUps;
 842
 843                 /* Exit code 0 means the watcher should exit */
 844                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
 845                         do_restart = 0;
 846                 }
 847
 848                 /* Exit code 101-109 means the watcher should exit */
 849                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
 850                         do_restart = 0;
 851                 }
 852
 853                 /* Any other exit code, or no exit code, means we should restart. */
 854                 else {
 855                         do_restart = 1;
 856                         nFireUps++;
 857                         ForkedPid = current_child;
 858                 }
 859
 860         } while (do_restart);
 861
 862         unlink(file_pid_file);
 863         exit(WEXITSTATUS(status));
 864 }
 865
 866
 867
 868 void checkcrash(void)
 869 {
 870         if (nFireUpsNonRestart != nFireUps)
 871         {
 872                 StrBuf *CrashMail;
 873
 874                 CrashMail = NewStrBuf();
 875                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
 876                 StrBufPrintf(CrashMail,
 877                         " \n"
 878                         " The Citadel server process (citserver) terminated unexpectedly."
 879                         "\n \n"
 880                         " This could be the result of a bug in the server program, or some external "
 881                         "factor.\n \n"
 882                         " You can obtain more information about this by enabling core dumps.\n \n"
 883                         " For more information, please see:\n \n"
 884                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
 885                         "\n \n"
 886
 887                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
 888                         ,
 889                         ctdl_run_dir, ForkedPid);
 890                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
 891                 FreeStrBuf(&CrashMail);
 892         }
 893 }
 894
 895
 896 /*
 897  * Generic routine to convert a login name to a full name (gecos)
 898  * Returns nonzero if a conversion took place
 899  */
 900 int convert_login(char NameToConvert[]) {
 901         struct passwd *pw;
 902         int a;
 903
 904         pw = getpwnam(NameToConvert);
 905         if (pw == NULL) {
 906                 return(0);
 907         }
 908         else {
 909                 strcpy(NameToConvert, pw->pw_gecos);
 910                 for (a=0; a<strlen(NameToConvert); ++a) {
 911                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
 912                 }
 913                 return(1);
 914         }
 915 }
 916
 917
 918
 919 /*
 920  * This loop just keeps going and going and going...
 921  */
 922 /*
 923  * FIXME:
 924  * This current implimentation of worker_thread creates a bottle neck in several situations
 925  * The first thing to remember is that a single thread can handle more than one connection at a time.
 926  * More threads mean less memory for the system to run in.
 927  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
 928  * something to happen anywhere.
 929  * This current implimentation requires worker threads to wait in other locations, after it has
 930  * been committed to a single connection which is very wasteful.
 931  * As an extreme case consider this:
 932  * A slow client connects and this slow client sends only one character each second.
 933  * With this current implimentation a single worker thread is dispatched to handle that connection
 934  * until such times as the client timeout expires, an error occurs on the socket or the client
 935  * completes its transmission.
 936  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
 937  * second interval between chars.
 938  *
 939  * It is my intention to re-write this code and the associated client_getln, client_read functions
 940  * to allow any thread to read data on behalf of any connection (context).
 941  * To do this I intend to have this main loop read chars into a buffer stored in the context.
 942  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
 943  * process it.
 944  * This worker thread loop also needs to be able to handle binary data.
 945  */
 946
 947 void *worker_thread(void *arg) {
 948         int highest;
 949         CitContext *ptr;
 950         CitContext *bind_me = NULL;
 951         fd_set readfds;
 952         int retval = 0;
 953         struct timeval tv;
 954         int force_purge = 0;
 955
 956
 957         while (!CtdlThreadCheckStop()) {
 958
 959                 /* make doubly sure we're not holding any stale db handles
 960                  * which might cause a deadlock.
 961                  */
 962                 cdb_check_handles();
 963 do_select:      force_purge = 0;
 964                 bind_me = NULL;         /* Which session shall we handle? */
 965
 966                 /* Initialize the fdset. */
 967                 FD_ZERO(&readfds);
 968                 highest = 0;
 969
 970                 begin_critical_section(S_SESSION_TABLE);
 971                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
 972                         /* Dont select on dead sessions only truly idle ones */
 973                         if ((ptr->state == CON_IDLE) && (CC->kill_me == 0)) {
 974                                 FD_SET(ptr->client_socket, &readfds);
 975                                 if (ptr->client_socket > highest)
 976                                         highest = ptr->client_socket;
 977                         }
 978                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
 979                                 bind_me = ptr;
 980                                 ptr->state = CON_EXECUTING;
 981                                 break;
 982                         }
 983                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
 984                                 bind_me = ptr;
 985                                 ptr->state = CON_STARTING;
 986                                 break;
 987                         }
 988                 }
 989                 end_critical_section(S_SESSION_TABLE);
 990
 991                 if (bind_me) {
 992                         goto SKIP_SELECT;
 993                 }
 994
 995                 /* If we got this far, it means that there are no sessions
 996                  * which a previous thread marked for attention, so we go
 997                  * ahead and get ready to select().
 998                  */
 999
1000                 if (!CtdlThreadCheckStop()) {
1001                         tv.tv_sec = 1;          /* wake up every second if no input */
1002                         tv.tv_usec = 0;
1003                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1004                 }
1005                 else
1006                         return NULL;
1007
1008                 /* Now figure out who made this select() unblock.
1009                  * First, check for an error or exit condition.
1010                  */
1011                 if (retval < 0) {
1012                         if (errno == EBADF) {
1013                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1014                                         strerror(errno));
1015                                 goto do_select;
1016                         }
1017                         if (errno != EINTR) {
1018                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1019                                 CtdlThreadStopAll();
1020                                 continue;
1021                         } else {
1022                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1023                                 if (CtdlThreadCheckStop()) return(NULL);
1024                                 goto do_select;
1025                         }
1026                 }
1027                 else if(retval == 0) {
1028                         if (CtdlThreadCheckStop()) return(NULL);
1029                 }
1030
1031                 /* It must be a client socket.  Find a context that has data
1032                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1033                  * active sockets other than our chosen one are marked as
1034                  * CON_READY so the next thread that comes around can just bind
1035                  * to one without having to select() again.
1036                  */
1037                 begin_critical_section(S_SESSION_TABLE);
1038                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1039                         if ( (FD_ISSET(ptr->client_socket, &readfds))
1040                            && (ptr->state == CON_IDLE) ) {
1041                                 ptr->input_waiting = 1;
1042                                 if (!bind_me) {
1043                                         bind_me = ptr;  /* I choose you! */
1044                                         bind_me->state = CON_EXECUTING;
1045                                 }
1046                                 else {
1047                                         ptr->state = CON_READY;
1048                                 }
1049                         }
1050                 }
1051                 end_critical_section(S_SESSION_TABLE);
1052
1053 SKIP_SELECT:
1054                 /* We're bound to a session */
1055                 if (bind_me != NULL) {
1056                         become_session(bind_me);
1057
1058                         if (bind_me->state == CON_STARTING) {
1059                                 bind_me->state = CON_EXECUTING;
1060                                 begin_session(bind_me);
1061                                 bind_me->h_greeting_function();
1062                         }
1063                         /* If the client has sent a command, execute it. */
1064                         if (CC->input_waiting) {
1065                                 CC->h_command_function();
1066
1067                                 while (HaveMoreLinesWaiting(CC))
1068                                        CC->h_command_function();
1069
1070                                 CC->input_waiting = 0;
1071                         }
1072
1073                         /* If there are asynchronous messages waiting and the
1074                          * client supports it, do those now */
1075                         if ((CC->is_async) && (CC->async_waiting)
1076                            && (CC->h_async_function != NULL)) {
1077                                 CC->h_async_function();
1078                                 CC->async_waiting = 0;
1079                         }
1080
1081                         force_purge = CC->kill_me;
1082                         become_session(NULL);
1083                         bind_me->state = CON_IDLE;
1084                 }
1085
1086                 dead_session_purge(force_purge);
1087                 do_housekeeping();
1088         }
1089         /* If control reaches this point, the server is shutting down */
1090         return(NULL);
1091 }
1092
1093
1094
1095
1096 /*
1097  * A function to handle selecting on master sockets.
1098  * In other words it handles new connections.
1099  * It is a thread.
1100  */
1101 void *select_on_master (void *arg)
1102 {
1103         struct ServiceFunctionHook *serviceptr;
1104         fd_set master_fds;
1105         int highest;
1106         struct timeval tv;
1107         int ssock;                      /* Descriptor for client socket */
1108         CitContext *con= NULL;  /* Temporary context pointer */
1109         int m;
1110         int i;
1111         int retval;
1112
1113         while (!CtdlThreadCheckStop()) {
1114                 /* Initialize the fdset. */
1115                 FD_ZERO(&master_fds);
1116                 highest = 0;
1117
1118                 /* First, add the various master sockets to the fdset. */
1119                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1120                 serviceptr = serviceptr->next ) {
1121                         m = serviceptr->msock;
1122                         FD_SET(m, &master_fds);
1123                         if (m > highest) {
1124                                 highest = m;
1125                         }
1126                 }
1127
1128                 if (!CtdlThreadCheckStop()) {
1129                         tv.tv_sec = 60;         /* wake up every second if no input */
1130                         tv.tv_usec = 0;
1131                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1132                 }
1133                 else
1134                         return NULL;
1135
1136                 /* Now figure out who made this select() unblock.
1137                  * First, check for an error or exit condition.
1138                  */
1139                 if (retval < 0) {
1140                         if (errno == EBADF) {
1141                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1142                                         strerror(errno));
1143                                 continue;
1144                         }
1145                         if (errno != EINTR) {
1146                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1147                                 CtdlThreadStopAll();
1148                         } else {
1149                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1150                                 if (CtdlThreadCheckStop()) return(NULL);
1151                                 continue;
1152                         }
1153                 }
1154                 else if(retval == 0) {
1155                         if (CtdlThreadCheckStop()) return(NULL);
1156                         continue;
1157                 }
1158                 /* Next, check to see if it's a new client connecting
1159                  * on a master socket.
1160                  */
1161                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1162                      serviceptr = serviceptr->next ) {
1163
1164                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1165                                 ssock = accept(serviceptr->msock, NULL, 0);
1166                                 if (ssock >= 0) {
1167                                         CtdlLogPrintf(CTDL_DEBUG,
1168                                                 "New client socket %d\n",
1169                                                 ssock);
1170
1171                                         /* The master socket is non-blocking but the client
1172                                          * sockets need to be blocking, otherwise certain
1173                                          * operations barf on FreeBSD.  Not a fatal error.
1174                                          */
1175                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1176                                                 CtdlLogPrintf(CTDL_EMERG,
1177                                                         "citserver: Can't set socket to blocking: %s\n",
1178                                                         strerror(errno));
1179                                         }
1180
1181                                         /* New context will be created already
1182                                          * set up in the CON_EXECUTING state.
1183                                          */
1184                                         con = CreateNewContext();
1185
1186                                         /* Assign our new socket number to it. */
1187                                         con->client_socket = ssock;
1188                                         con->h_command_function =
1189                                                 serviceptr->h_command_function;
1190                                         con->h_async_function =
1191                                                 serviceptr->h_async_function;
1192                                         con->h_greeting_function = serviceptr->h_greeting_function;
1193                                         con->ServiceName =
1194                                                 serviceptr->ServiceName;
1195
1196                                         /* Determine whether it's a local socket */
1197                                         if (serviceptr->sockpath != NULL)
1198                                                 con->is_local_socket = 1;
1199
1200                                         /* Set the SO_REUSEADDR socket option */
1201                                         i = 1;
1202                                         setsockopt(ssock, SOL_SOCKET,
1203                                                 SO_REUSEADDR,
1204                                                 &i, sizeof(i));
1205
1206                                         con->state = CON_GREETING;
1207
1208                                         retval--;
1209                                         if (retval == 0)
1210                                                 break;
1211                                 }
1212                         }
1213                 }
1214         }
1215         return NULL;
1216 }
1217
1218
1219
1220 /*
1221  * SyslogFacility()
1222  * Translate text facility name to syslog.h defined value.
1223  */
1224 int SyslogFacility(char *name)
1225 {
1226         int i;
1227         struct
1228         {
1229                 int facility;
1230                 char *name;
1231         }   facTbl[] =
1232         {
1233                 {   LOG_KERN,   "kern"          },
1234                 {   LOG_USER,   "user"          },
1235                 {   LOG_MAIL,   "mail"          },
1236                 {   LOG_DAEMON, "daemon"        },
1237                 {   LOG_AUTH,   "auth"          },
1238                 {   LOG_SYSLOG, "syslog"        },
1239                 {   LOG_LPR,    "lpr"           },
1240                 {   LOG_NEWS,   "news"          },
1241                 {   LOG_UUCP,   "uucp"          },
1242                 {   LOG_LOCAL0, "local0"        },
1243                 {   LOG_LOCAL1, "local1"        },
1244                 {   LOG_LOCAL2, "local2"        },
1245                 {   LOG_LOCAL3, "local3"        },
1246                 {   LOG_LOCAL4, "local4"        },
1247                 {   LOG_LOCAL5, "local5"        },
1248                 {   LOG_LOCAL6, "local6"        },
1249                 {   LOG_LOCAL7, "local7"        },
1250                 {   0,            NULL          }
1251         };
1252         for(i = 0; facTbl[i].name != NULL; i++) {
1253                 if(!strcasecmp(name, facTbl[i].name))
1254                         return facTbl[i].facility;
1255         }
1256         enable_syslog = 0;
1257         return LOG_DAEMON;
1258 }
1259
1260
1261 /********** MEM CHEQQER ***********/
1262
1263 #ifdef DEBUG_MEMORY_LEAKS
1264
1265 #undef malloc
1266 #undef realloc
1267 #undef strdup
1268 #undef free
1269
1270 void *tracked_malloc(size_t size, char *file, int line) {
1271         struct igheap *thisheap;
1272         void *block;
1273
1274         block = malloc(size);
1275         if (block == NULL) return(block);
1276
1277         thisheap = malloc(sizeof(struct igheap));
1278         if (thisheap == NULL) {
1279                 free(block);
1280                 return(NULL);
1281         }
1282
1283         thisheap->block = block;
1284         strcpy(thisheap->file, file);
1285         thisheap->line = line;
1286
1287         begin_critical_section(S_DEBUGMEMLEAKS);
1288         thisheap->next = igheap;
1289         igheap = thisheap;
1290         end_critical_section(S_DEBUGMEMLEAKS);
1291
1292         return(block);
1293 }
1294
1295
1296 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1297         struct igheap *thisheap;
1298         void *block;
1299
1300         block = realloc(ptr, size);
1301         if (block == NULL) return(block);
1302
1303         thisheap = malloc(sizeof(struct igheap));
1304         if (thisheap == NULL) {
1305                 free(block);
1306                 return(NULL);
1307         }
1308
1309         thisheap->block = block;
1310         strcpy(thisheap->file, file);
1311         thisheap->line = line;
1312
1313         begin_critical_section(S_DEBUGMEMLEAKS);
1314         thisheap->next = igheap;
1315         igheap = thisheap;
1316         end_critical_section(S_DEBUGMEMLEAKS);
1317
1318         return(block);
1319 }
1320
1321
1322
1323 void tracked_free(void *ptr) {
1324         struct igheap *thisheap;
1325         struct igheap *trash;
1326
1327         free(ptr);
1328
1329         if (igheap == NULL) return;
1330         begin_critical_section(S_DEBUGMEMLEAKS);
1331         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1332                 if (thisheap->next != NULL) {
1333                         if (thisheap->next->block == ptr) {
1334                                 trash = thisheap->next;
1335                                 thisheap->next = thisheap->next->next;
1336                                 free(trash);
1337                         }
1338                 }
1339         }
1340         if (igheap->block == ptr) {
1341                 trash = igheap;
1342                 igheap = igheap->next;
1343                 free(trash);
1344         }
1345         end_critical_section(S_DEBUGMEMLEAKS);
1346 }
1347
1348 char *tracked_strdup(const char *s, char *file, int line) {
1349         char *ptr;
1350
1351         if (s == NULL) return(NULL);
1352         ptr = tracked_malloc(strlen(s) + 1, file, line);
1353         if (ptr == NULL) return(NULL);
1354         strncpy(ptr, s, strlen(s));
1355         return(ptr);
1356 }
1357
1358 void dump_heap(void) {
1359         struct igheap *thisheap;
1360
1361         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1362                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1363                         thisheap->file, thisheap->line);
1364         }
1365 }
1366
1367 #endif /*  DEBUG_MEMORY_LEAKS */