citadel/sysdep.c

   1 /*
   2  * $Id$
   3  *
   4  * Citadel "system dependent" stuff.
   5  * See COPYING for copyright information.
   6  *
   7  * Here's where we (hopefully) have most parts of the Citadel server that
   8  * would need to be altered to run the server in a non-POSIX environment.
   9  *
  10  * If we ever port to a different platform and either have multiple
  11  * variants of this file or simply load it up with #ifdefs.
  12  *
  13  */
  14
  15 #include "sysdep.h"
  16 #include <stdlib.h>
  17 #include <unistd.h>
  18 #include <stdio.h>
  19 #include <fcntl.h>
  20 #include <ctype.h>
  21 #include <signal.h>
  22 #include <sys/types.h>
  23 #include <sys/stat.h>
  24 #include <sys/wait.h>
  25 #include <sys/socket.h>
  26 #include <syslog.h>
  27 #include <sys/syslog.h>
  28
  29 #if TIME_WITH_SYS_TIME
  30 # include <sys/time.h>
  31 # include <time.h>
  32 #else
  33 # if HAVE_SYS_TIME_H
  34 #  include <sys/time.h>
  35 # else
  36 #  include <time.h>
  37 # endif
  38 #endif
  39
  40 #include <limits.h>
  41 #include <sys/resource.h>
  42 #include <netinet/in.h>
  43 #include <netinet/tcp.h>
  44 #include <arpa/inet.h>
  45 #include <netdb.h>
  46 #include <sys/un.h>
  47 #include <string.h>
  48 #include <pwd.h>
  49 #include <errno.h>
  50 #include <stdarg.h>
  51 #include <grp.h>
  52 #define SHOW_ME_VAPPEND_PRINTF
  53 #include <libcitadel.h>
  54 #include "citadel.h"
  55 #include "server.h"
  56 #include "sysdep_decls.h"
  57 #include "citserver.h"
  58 #include "support.h"
  59 #include "config.h"
  60 #include "database.h"
  61 #include "housekeeping.h"
  62 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  63 #include "ecrash.h"
  64 #include "context.h"
  65
  66 #ifdef HAVE_SYS_SELECT_H
  67 #include <sys/select.h>
  68 #endif
  69
  70 #ifndef HAVE_SNPRINTF
  71 #include "snprintf.h"
  72 #endif
  73
  74 #include "ctdl_module.h"
  75 #include "threads.h"
  76 #include "user_ops.h"
  77 #include "control.h"
  78
  79
  80 #ifdef DEBUG_MEMORY_LEAKS
  81 struct igheap {
  82         struct igheap *next;
  83         char file[32];
  84         int line;
  85         void *block;
  86 };
  87
  88 struct igheap *igheap = NULL;
  89 #endif
  90
  91
  92 int verbosity = DEFAULT_VERBOSITY;              /* Logging level */
  93
  94 int syslog_facility = LOG_DAEMON;
  95 int enable_syslog = 0;
  96 int print_to_logfile = 1;
  97
  98 /*
  99  * CtdlLogPrintf()  ...   Write logging information
 100  */
 101 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...) {
 102         va_list arg_ptr;
 103         va_start(arg_ptr, format);
 104         vCtdlLogPrintf(loglevel, format, arg_ptr);
 105         va_end(arg_ptr);
 106 }
 107
 108 void vCtdlLogPrintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 109 {
 110
 111         if (enable_syslog) {
 112                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 113         }
 114
 115         /* stderr output code */
 116         if (enable_syslog || !print_to_logfile) return;
 117
 118         /* if we run in forground and syslog is disabled, log to terminal */
 119         if (loglevel <= verbosity) {
 120                 struct timeval tv;
 121                 struct tm tim;
 122                 time_t unixtime;
 123                 CitContext *CCC = MyContext();
 124                 ThreadTSD *cTSD = CTP;
 125                 CtdlThreadNode *node = NULL;
 126                 long lwpid = 0;
 127
 128                 if (cTSD != NULL) {
 129                         node = cTSD->self;
 130                 }
 131
 132                 if ((node != NULL) && (node->reltid != 0)) {
 133                         lwpid = node->reltid;
 134                 }
 135
 136                 gettimeofday(&tv, NULL);
 137
 138                 /* Promote to time_t; types differ on some OSes (like darwin) */
 139                 unixtime = tv.tv_sec;
 140                 localtime_r(&unixtime, &tim);
 141
 142                 fprintf(stderr,
 143                         "%04d/%02d/%02d %2d:%02d:%02d.%06ld ",
 144                         tim.tm_year + 1900, tim.tm_mon + 1,
 145                         tim.tm_mday, tim.tm_hour, tim.tm_min,
 146                         tim.tm_sec, (long)tv.tv_usec
 147                 );
 148
 149                 if (lwpid != 0) {
 150                         fprintf(stderr, "[LWP:%ld] ", lwpid);
 151                 }
 152
 153                 if (CCC != NULL) {
 154                         if (CCC->cs_pid != 0) {
 155                                 fprintf(stderr, "[%3d] ", CCC->cs_pid);
 156                         }
 157                         else if (CCC->user.usernum != 0) {
 158                                 fprintf(stderr, "[:%ld] ", CCC->user.usernum);
 159                         }
 160                 }
 161
 162                 vfprintf(stderr, format, arg_ptr);
 163                 fflush(stderr);
 164         }
 165 }
 166
 167
 168
 169 /*
 170  * Signal handler to shut down the server.
 171  */
 172
 173 volatile int exit_signal = 0;
 174 volatile int shutdown_and_halt = 0;
 175 volatile int restart_server = 0;
 176 volatile int running_as_daemon = 0;
 177
 178 static RETSIGTYPE signal_cleanup(int signum) {
 179
 180         if (CT)
 181                 CT->signal = signum;
 182         else
 183         {
 184                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 185                 exit_signal = signum;
 186         }
 187 }
 188
 189 static RETSIGTYPE signal_exit(int signum) {
 190         exit(1);
 191 }
 192
 193
 194
 195 /*
 196  * Some initialization stuff...
 197  */
 198 void init_sysdep(void) {
 199         sigset_t set;
 200
 201         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 202 #ifdef FD_SETSIZE
 203 #ifdef RLIMIT_NOFILE
 204         struct rlimit rl;
 205         getrlimit(RLIMIT_NOFILE, &rl);
 206         rl.rlim_cur = FD_SETSIZE;
 207         rl.rlim_max = FD_SETSIZE;
 208         setrlimit(RLIMIT_NOFILE, &rl);
 209 #endif
 210 #endif
 211
 212         /* If we've got OpenSSL, we're going to use it. */
 213 #ifdef HAVE_OPENSSL
 214         init_ssl();
 215 #endif
 216
 217         /*
 218          * Set up a place to put thread-specific data.
 219          * We only need a single pointer per thread - it points to the
 220          * CitContext structure (in the ContextList linked list) of the
 221          * session to which the calling thread is currently bound.
 222          */
 223         if (citthread_key_create(&MyConKey, NULL) != 0) {
 224                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 225                         strerror(errno));
 226         }
 227
 228         /*
 229          * The action for unexpected signals and exceptions should be to
 230          * call signal_cleanup() to gracefully shut down the server.
 231          */
 232         sigemptyset(&set);
 233         sigaddset(&set, SIGINT);                // intr = shutdown
 234         // sigaddset(&set, SIGQUIT);            // quit = force quit
 235         sigaddset(&set, SIGHUP);
 236         sigaddset(&set, SIGTERM);
 237         // sigaddset(&set, SIGSEGV);            // we want core dumps
 238         // sigaddset(&set, SIGILL);             // we want core dumps
 239         // sigaddset(&set, SIGBUS);
 240         sigprocmask(SIG_UNBLOCK, &set, NULL);
 241
 242         signal(SIGINT, signal_cleanup);         // intr = shutdown
 243         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 244         signal(SIGHUP, signal_cleanup);
 245         signal(SIGTERM, signal_cleanup);
 246         signal(SIGUSR2, signal_exit);
 247         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 248         // signal(SIGILL, signal_cleanup);      // we want core dumps
 249         // signal(SIGBUS, signal_cleanup);
 250
 251         /*
 252          * Do not shut down the server on broken pipe signals, otherwise the
 253          * whole Citadel service would come down whenever a single client
 254          * socket breaks.
 255          */
 256         signal(SIGPIPE, SIG_IGN);
 257 }
 258
 259
 260 /*
 261  * This is a generic function to set up a master socket for listening on
 262  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 263  *
 264  * ip_addr      IP address to bind
 265  * port_number  port number to bind
 266  * queue_len    number of incoming connections to allow in the queue
 267  */
 268 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 269 {
 270         struct protoent *p;
 271         struct sockaddr_in6 sin6;
 272         struct sockaddr_in sin4;
 273         int s, i, b;
 274         int ip_version = 6;
 275
 276         memset(&sin6, 0, sizeof(sin6));
 277         memset(&sin4, 0, sizeof(sin4));
 278         sin6.sin6_family = AF_INET6;
 279         sin4.sin_family = AF_INET;
 280
 281         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 282                 || (IsEmptyStr(ip_addr))
 283                 || (!strcmp(ip_addr, "*"))
 284         ) {
 285                 ip_version = 6;
 286                 sin6.sin6_addr = in6addr_any;
 287         }
 288         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 289         {
 290                 ip_version = 4;
 291                 sin4.sin_addr.s_addr = INADDR_ANY;
 292         }
 293         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 294         {
 295                 ip_version = 4;
 296                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 297                         snprintf(errormessage, SIZ,
 298                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 299                         );
 300                         CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 301                         return (-1);
 302                 }
 303         }
 304         else                                                                            /* specific IPv6 */
 305         {
 306                 ip_version = 6;
 307                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 308                         snprintf(errormessage, SIZ,
 309                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 310                         );
 311                         CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 312                         return (-1);
 313                 }
 314         }
 315
 316         if (port_number == 0) {
 317                 snprintf(errormessage, SIZ,
 318                          "Can't start: no port number specified."
 319                 );
 320                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 321                 return (-1);
 322         }
 323         sin6.sin6_port = htons((u_short) port_number);
 324         sin4.sin_port = htons((u_short) port_number);
 325
 326         p = getprotobyname("tcp");
 327
 328         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 329         if (s < 0) {
 330                 snprintf(errormessage, SIZ,
 331                          "Can't create a listening socket: %s", strerror(errno)
 332                 );
 333                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 334                 return (-1);
 335         }
 336         /* Set some socket options that make sense. */
 337         i = 1;
 338         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 339
 340         if (ip_version == 6) {
 341                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 342         }
 343         else {
 344                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 345         }
 346
 347         if (b < 0) {
 348                 snprintf(errormessage, SIZ,
 349                          "Can't bind: %s", strerror(errno)
 350                 );
 351                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 352                 return (-1);
 353         }
 354
 355         fcntl(s, F_SETFL, O_NONBLOCK);
 356
 357         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 358                 snprintf(errormessage, SIZ,
 359                          "Can't listen: %s", strerror(errno)
 360                 );
 361                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 362                 return (-1);
 363         }
 364         return (s);
 365 }
 366
 367
 368
 369
 370
 371 /*
 372  * Create a Unix domain socket and listen on it
 373  */
 374 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 375 {
 376         struct sockaddr_un addr;
 377         int s;
 378         int i;
 379         int actual_queue_len;
 380 #ifdef HAVE_STRUCT_UCRED
 381         int passcred = 1;
 382 #endif
 383
 384         actual_queue_len = queue_len;
 385         if (actual_queue_len < 5) actual_queue_len = 5;
 386
 387         i = unlink(sockpath);
 388         if ((i != 0) && (errno != ENOENT)) {
 389                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 390                         sockpath, strerror(errno)
 391                 );
 392                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 393                 return(-1);
 394         }
 395
 396         memset(&addr, 0, sizeof(addr));
 397         addr.sun_family = AF_UNIX;
 398         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 399
 400         s = socket(AF_UNIX, SOCK_STREAM, 0);
 401         if (s < 0) {
 402                 snprintf(errormessage, SIZ,
 403                          "citserver: Can't create a socket: %s",
 404                          strerror(errno));
 405                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 406                 return(-1);
 407         }
 408
 409         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 410                 snprintf(errormessage, SIZ,
 411                          "citserver: Can't bind: %s",
 412                          strerror(errno));
 413                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 414                 return(-1);
 415         }
 416
 417         /* set to nonblock - we need this for some obscure situations */
 418         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 419                 snprintf(errormessage, SIZ,
 420                          "citserver: Can't set socket to non-blocking: %s",
 421                          strerror(errno));
 422                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 423                 close(s);
 424                 return(-1);
 425         }
 426
 427         if (listen(s, actual_queue_len) < 0) {
 428                 snprintf(errormessage, SIZ,
 429                          "citserver: Can't listen: %s",
 430                          strerror(errno));
 431                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 432                 return(-1);
 433         }
 434
 435 #ifdef HAVE_STRUCT_UCRED
 436         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 437 #endif
 438
 439         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 440         return(s);
 441 }
 442
 443
 444
 445 /*
 446  * The following functions implement output buffering on operating systems which
 447  * support it (such as Linux and various BSD flavors).
 448  */
 449 #ifndef HAVE_DARWIN
 450 #ifdef TCP_CORK
 451 #       define HAVE_TCP_BUFFERING
 452 #else
 453 #       ifdef TCP_NOPUSH
 454 #               define HAVE_TCP_BUFFERING
 455 #               define TCP_CORK TCP_NOPUSH
 456 #       endif
 457 #endif /* TCP_CORK */
 458 #endif /* HAVE_DARWIN */
 459
 460 static unsigned on = 1, off = 0;
 461
 462 void buffer_output(void) {
 463 #ifdef HAVE_TCP_BUFFERING
 464 #ifdef HAVE_OPENSSL
 465         if (!CC->redirect_ssl)
 466 #endif
 467                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 468 #endif
 469 }
 470
 471 void unbuffer_output(void) {
 472 #ifdef HAVE_TCP_BUFFERING
 473 #ifdef HAVE_OPENSSL
 474         if (!CC->redirect_ssl)
 475 #endif
 476                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 477 #endif
 478 }
 479
 480 void flush_output(void) {
 481 #ifdef HAVE_TCP_BUFFERING
 482         struct CitContext *CCC = CC;
 483         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 484         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 485 #endif
 486 }
 487
 488 /*
 489 static void flush_client_inbuf(void)
 490 {
 491         CitContext *CCC=CC;
 492
 493         FlushStrBuf(CCC->ReadBuf);
 494         CCC->Pos = NULL;
 495
 496 }
 497 */
 498
 499 /*
 500  * client_write()   ...    Send binary data to the client.
 501  */
 502 int client_write(const char *buf, int nbytes)
 503 {
 504         int bytes_written = 0;
 505         int retval;
 506 #ifndef HAVE_TCP_BUFFERING
 507         int old_buffer_len = 0;
 508 #endif
 509         fd_set wset;
 510         CitContext *Ctx;
 511         int fdflags;
 512
 513         if (nbytes < 1) return(0);
 514
 515 //      flush_client_inbuf();
 516         Ctx = CC;
 517         if (Ctx->redirect_buffer != NULL) {
 518                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 519                                      buf, nbytes, 0);
 520                 return 0;
 521         }
 522
 523 #ifdef HAVE_OPENSSL
 524         if (Ctx->redirect_ssl) {
 525                 client_write_ssl(buf, nbytes);
 526                 return 0;
 527         }
 528 #endif
 529         if (Ctx->client_socket == -1) return -1;
 530
 531         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 532
 533         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 534                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 535                         FD_ZERO(&wset);
 536                         FD_SET(Ctx->client_socket, &wset);
 537                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 538                                 if (errno == EINTR)
 539                                 {
 540                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 541                                         if (CtdlThreadCheckStop()) {
 542                                                 CC->kill_me = 1;
 543                                                 return (-1);
 544                                         } else {
 545                                                 /* can't trust fd's and stuff so we need to re-create them */
 546                                                 continue;
 547                                         }
 548                                 } else {
 549                                         CtdlLogPrintf(CTDL_ERR,
 550                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 551                                                 nbytes - bytes_written,
 552                                                 strerror(errno), errno);
 553                                         cit_backtrace();
 554                                         Ctx->kill_me = 1;
 555                                         return -1;
 556                                 }
 557                         }
 558                 }
 559
 560                 retval = write(Ctx->client_socket, &buf[bytes_written],
 561                         nbytes - bytes_written);
 562                 if (retval < 1) {
 563                         CtdlLogPrintf(CTDL_ERR,
 564                                 "client_write(%d bytes) failed: %s (%d)\n",
 565                                 nbytes - bytes_written,
 566                                 strerror(errno), errno);
 567                         cit_backtrace();
 568                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 569                         Ctx->kill_me = 1;
 570                         return -1;
 571                 }
 572                 bytes_written = bytes_written + retval;
 573         }
 574         return 0;
 575 }
 576
 577 void cputbuf(const StrBuf *Buf) {
 578         client_write(ChrPtr(Buf), StrLength(Buf));
 579 }
 580
 581
 582 /*
 583  * cprintf()    Send formatted printable data to the client.
 584  *              Implemented in terms of client_write() so it's technically not sysdep...
 585  */
 586 void cprintf(const char *format, ...) {
 587         va_list arg_ptr;
 588         char buf[1024];
 589
 590         va_start(arg_ptr, format);
 591         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 592                 buf[sizeof buf - 2] = '\n';
 593         client_write(buf, strlen(buf));
 594         va_end(arg_ptr);
 595 }
 596
 597
 598 /*
 599  * Read data from the client socket.
 600  *
 601  * sock         socket fd to read from
 602  * buf          buffer to read into
 603  * bytes        number of bytes to read
 604  * timeout      Number of seconds to wait before timing out
 605  *
 606  * Possible return values:
 607  *      1       Requested number of bytes has been read.
 608  *      0       Request timed out.
 609  *      -1      Connection is broken, or other error.
 610  */
 611 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 612 {
 613         CitContext *CCC=CC;
 614         const char *Error;
 615         int retval = 0;
 616
 617 #ifdef HAVE_OPENSSL
 618         if (CCC->redirect_ssl) {
 619                 retval = client_read_sslblob(Target, bytes, timeout);
 620                 if (retval < 0) {
 621                         CtdlLogPrintf(CTDL_CRIT,
 622                                       "%s failed\n",
 623                                       __FUNCTION__);
 624                 }
 625         }
 626         else
 627 #endif
 628         {
 629                 retval = StrBufReadBLOBBuffered(Target,
 630                                                 CCC->ReadBuf,
 631                                                 &CCC->Pos,
 632                                                 &CCC->client_socket,
 633                                                 1,
 634                                                 bytes,
 635                                                 O_TERM,
 636                                                 &Error);
 637                 if (retval < 0) {
 638                         CtdlLogPrintf(CTDL_CRIT,
 639                                       "%s failed: %s\n",
 640                                       __FUNCTION__,
 641                                       Error);
 642                         return retval;
 643                 }
 644                 else
 645                 {
 646 #ifdef BIGBAD_IODBG
 647                         int rv = 0;
 648                         char fn [SIZ];
 649                         FILE *fd;
 650
 651                         snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 652
 653                         fd = fopen(fn, "a+");
 654                         fprintf(fd, "Read: BufSize: %d BufContent: [",
 655                                 StrLength(Target));
 656                         rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 657                         fprintf(fd, "]\n");
 658
 659
 660                         fclose(fd);
 661 #endif
 662
 663                 }
 664         }
 665         return retval;
 666 }
 667
 668
 669 /*
 670  * to make client_read_random_blob() more efficient, increase buffer size.
 671  * just use in greeting function, else your buffer may be flushed
 672  */
 673 void client_set_inbound_buf(long N)
 674 {
 675         FlushStrBuf(CC->ReadBuf);
 676         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 677 }
 678
 679 int client_read_random_blob(StrBuf *Target, int timeout)
 680 {
 681         CitContext *CCC=CC;
 682         int rc;
 683
 684         rc =  client_read_blob(Target, 1, timeout);
 685         if (rc > 0)
 686         {
 687                 long len;
 688                 const char *pch;
 689
 690                 len = StrLength(CCC->ReadBuf);
 691                 pch = ChrPtr(CCC->ReadBuf);
 692
 693                 if (len > 0)
 694                 {
 695                         if (CCC->Pos != NULL) {
 696                                 len -= CCC->Pos - pch;
 697                                 pch = CCC->Pos;
 698                         }
 699                         StrBufAppendBufPlain(Target, pch, len, 0);
 700                         FlushStrBuf(CCC->ReadBuf);
 701                         CCC->Pos = NULL;
 702 #ifdef BIGBAD_IODBG
 703                         {
 704                                 int rv = 0;
 705                                 char fn [SIZ];
 706                                 FILE *fd;
 707
 708                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 709
 710                                 fd = fopen(fn, "a+");
 711                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 712                                         StrLength(Target));
 713                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 714                                 fprintf(fd, "]\n");
 715
 716
 717                                 fclose(fd);
 718                         }
 719 #endif
 720
 721                         return StrLength(Target);
 722                 }
 723                 return rc;
 724         }
 725         else
 726                 return rc;
 727 }
 728
 729 int client_read_to(char *buf, int bytes, int timeout)
 730 {
 731         CitContext *CCC=CC;
 732         int rc;
 733
 734         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 735         if (rc < 0)
 736         {
 737                 *buf = '\0';
 738                 return rc;
 739         }
 740         else
 741         {
 742                 memcpy(buf,
 743                        ChrPtr(CCC->MigrateBuf),
 744                        StrLength(CCC->MigrateBuf) + 1);
 745                 FlushStrBuf(CCC->MigrateBuf);
 746                 return rc;
 747         }
 748 }
 749
 750
 751 int HaveMoreLinesWaiting(CitContext *CCC)
 752 {
 753         if ((CCC->kill_me == 1) || (
 754             (CCC->Pos == NULL) &&
 755             (StrLength(CCC->ReadBuf) == 0) &&
 756             (CCC->client_socket != -1)) )
 757                 return 0;
 758         else
 759                 return 1;
 760 }
 761
 762
 763 /*
 764  * Read data from the client socket with default timeout.
 765  * (This is implemented in terms of client_read_to() and could be
 766  * justifiably moved out of sysdep.c)
 767  */
 768 INLINE int client_read(char *buf, int bytes)
 769 {
 770         return(client_read_to(buf, bytes, config.c_sleeping));
 771 }
 772
 773 int CtdlClientGetLine(StrBuf *Target)
 774 {
 775         CitContext *CCC=CC;
 776         const char *Error;
 777         int rc;
 778
 779         FlushStrBuf(Target);
 780 #ifdef HAVE_OPENSSL
 781         if (CCC->redirect_ssl) {
 782 #ifdef BIGBAD_IODBG
 783                 char fn [SIZ];
 784                 FILE *fd;
 785                 int len = 0;
 786                 int rlen = 0;
 787                 int  nlen = 0;
 788                 int nrlen = 0;
 789                 const char *pch;
 790
 791                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 792
 793                 fd = fopen(fn, "a+");
 794                 pch = ChrPtr(CCC->ReadBuf);
 795                 len = StrLength(CCC->ReadBuf);
 796                 if (CCC->Pos != NULL)
 797                         rlen = CC->Pos - pch;
 798                 else
 799                         rlen = 0;
 800
 801 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 802                         len, rlen, pch);
 803 */
 804                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 805                         len, rlen);
 806 #endif
 807                 rc = client_readline_sslbuffer(Target,
 808                                                CCC->ReadBuf,
 809                                                &CCC->Pos,
 810                                                1);
 811 #ifdef BIGBAD_IODBG
 812                 pch = ChrPtr(CCC->ReadBuf);
 813                 nlen = StrLength(CCC->ReadBuf);
 814                 if (CCC->Pos != NULL)
 815                         nrlen = CC->Pos - pch;
 816                 else
 817                         nrlen = 0;
 818 /*
 819                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 820                         len, nlen, rlen, nrlen, pch);
 821 */
 822                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 823                         len, nlen, rlen, nrlen);
 824
 825                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 826                         StrLength(Target), ChrPtr(Target));
 827                 fclose(fd);
 828
 829                 if (rc < 0)
 830                         CtdlLogPrintf(CTDL_CRIT,
 831                                       "%s failed\n",
 832                                       __FUNCTION__);
 833 #endif
 834                 return rc;
 835         }
 836         else
 837 #endif
 838         {
 839 #ifdef BIGBAD_IODBG
 840                 char fn [SIZ];
 841                 FILE *fd;
 842                 int len, rlen, nlen, nrlen;
 843                 const char *pch;
 844
 845                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 846
 847                 fd = fopen(fn, "a+");
 848                 pch = ChrPtr(CCC->ReadBuf);
 849                 len = StrLength(CCC->ReadBuf);
 850                 if (CCC->Pos != NULL)
 851                         rlen = CC->Pos - pch;
 852                 else
 853                         rlen = 0;
 854
 855 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 856                         len, rlen, pch);
 857 */
 858                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 859                         len, rlen);
 860 #endif
 861                 rc = StrBufTCP_read_buffered_line_fast(Target,
 862                                                        CCC->ReadBuf,
 863                                                        &CCC->Pos,
 864                                                        &CCC->client_socket,
 865                                                        5,
 866                                                        1,
 867                                                        &Error);
 868
 869 #ifdef BIGBAD_IODBG
 870                 pch = ChrPtr(CCC->ReadBuf);
 871                 nlen = StrLength(CCC->ReadBuf);
 872                 if (CCC->Pos != NULL)
 873                         nrlen = CC->Pos - pch;
 874                 else
 875                         nrlen = 0;
 876 /*
 877                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 878                         len, nlen, rlen, nrlen, pch);
 879 */
 880                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 881                         len, nlen, rlen, nrlen);
 882
 883                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 884                         StrLength(Target), ChrPtr(Target));
 885                 fclose(fd);
 886
 887                 if ((rc < 0) && (Error != NULL))
 888                         CtdlLogPrintf(CTDL_CRIT,
 889                                       "%s failed: %s\n",
 890                                       __FUNCTION__,
 891                                       Error);
 892 #endif
 893                 return rc;
 894         }
 895 }
 896
 897
 898 /*
 899  * client_getln()   ...   Get a LF-terminated line of text from the client.
 900  * (This is implemented in terms of client_read() and could be
 901  * justifiably moved out of sysdep.c)
 902  */
 903 int client_getln(char *buf, int bufsize)
 904 {
 905         int i, retval;
 906         CitContext *CCC=CC;
 907         const char *pCh;
 908
 909         retval = CtdlClientGetLine(CCC->MigrateBuf);
 910         if (retval < 0)
 911           return(retval >= 0);
 912
 913
 914         i = StrLength(CCC->MigrateBuf);
 915         pCh = ChrPtr(CCC->MigrateBuf);
 916         /* Strip the trailing LF, and the trailing CR if present.
 917          */
 918         if (bufsize <= i)
 919                 i = bufsize - 1;
 920         while ( (i > 0)
 921                 && ( (pCh[i - 1]==13)
 922                      || ( pCh[i - 1]==10)) ) {
 923                 i--;
 924         }
 925         memcpy(buf, pCh, i);
 926         buf[i] = 0;
 927
 928         FlushStrBuf(CCC->MigrateBuf);
 929         if (retval < 0) {
 930                 safestrncpy(&buf[i], "000", bufsize - i);
 931         }
 932         return(retval >= 0);
 933 }
 934
 935
 936 /*
 937  * Cleanup any contexts that are left lying around
 938  */
 939
 940
 941 void close_masters (void)
 942 {
 943         struct ServiceFunctionHook *serviceptr;
 944
 945         /*
 946          * close all protocol master sockets
 947          */
 948         for (serviceptr = ServiceHookTable; serviceptr != NULL;
 949             serviceptr = serviceptr->next ) {
 950
 951                 if (serviceptr->tcp_port > 0)
 952                 {
 953                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
 954                                 serviceptr->tcp_port);
 955                         serviceptr->tcp_port = 0;
 956                 }
 957
 958                 if (serviceptr->sockpath != NULL)
 959                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
 960                                 serviceptr->sockpath);
 961
 962                 close(serviceptr->msock);
 963                 /* If it's a Unix domain socket, remove the file. */
 964                 if (serviceptr->sockpath != NULL) {
 965                         unlink(serviceptr->sockpath);
 966                         serviceptr->sockpath = NULL;
 967                 }
 968         }
 969 }
 970
 971
 972 /*
 973  * The system-dependent part of master_cleanup() - close the master socket.
 974  */
 975 void sysdep_master_cleanup(void) {
 976
 977         close_masters();
 978
 979         context_cleanup();
 980
 981 #ifdef HAVE_OPENSSL
 982         destruct_ssl();
 983 #endif
 984         CtdlDestroyProtoHooks();
 985         CtdlDestroyDeleteHooks();
 986         CtdlDestroyXmsgHooks();
 987         CtdlDestroyNetprocHooks();
 988         CtdlDestroyUserHooks();
 989         CtdlDestroyMessageHook();
 990         CtdlDestroyCleanupHooks();
 991         CtdlDestroyFixedOutputHooks();
 992         CtdlDestroySessionHooks();
 993         CtdlDestroyServiceHook();
 994         CtdlDestroyRoomHooks();
 995         #ifdef HAVE_BACKTRACE
 996 ///     eCrash_Uninit();
 997         #endif
 998 }
 999
1000
1001
1002 pid_t current_child;
1003 void graceful_shutdown(int signum) {
1004         kill(current_child, signum);
1005         unlink(file_pid_file);
1006         exit(0);
1007 }
1008
1009 int nFireUps = 0;
1010 int nFireUpsNonRestart = 0;
1011 pid_t ForkedPid = 1;
1012
1013 /*
1014  * Start running as a daemon.
1015  */
1016 void start_daemon(int unused) {
1017         int status = 0;
1018         pid_t child = 0;
1019         FILE *fp;
1020         int do_restart = 0;
1021
1022         current_child = 0;
1023
1024         /* Close stdin/stdout/stderr and replace them with /dev/null.
1025          * We don't just call close() because we don't want these fd's
1026          * to be reused for other files.
1027          */
1028         if (chdir(ctdl_run_dir) != 0)
1029                 CtdlLogPrintf(CTDL_EMERG,
1030                               "unable to change into directory [%s]: %s",
1031                               ctdl_run_dir, strerror(errno));
1032
1033         child = fork();
1034         if (child != 0) {
1035                 exit(0);
1036         }
1037
1038         signal(SIGHUP, SIG_IGN);
1039         signal(SIGINT, SIG_IGN);
1040         signal(SIGQUIT, SIG_IGN);
1041
1042         setsid();
1043         umask(0);
1044         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1045             (freopen("/dev/null", "w", stdout) != stdout) ||
1046             (freopen("/dev/null", "w", stderr) != stderr))
1047                 CtdlLogPrintf(CTDL_EMERG,
1048                               "unable to reopen stdin/out/err %s",
1049                               strerror(errno));
1050
1051
1052         do {
1053                 current_child = fork();
1054
1055                 signal(SIGTERM, graceful_shutdown);
1056
1057                 if (current_child < 0) {
1058                         perror("fork");
1059                         exit(errno);
1060                 }
1061
1062                 else if (current_child == 0) {
1063                         return; /* continue starting citadel. */
1064                 }
1065
1066                 else {
1067                         fp = fopen(file_pid_file, "w");
1068                         if (fp != NULL) {
1069                                 fprintf(fp, ""F_PID_T"\n", getpid());
1070                                 fclose(fp);
1071                         }
1072                         waitpid(current_child, &status, 0);
1073                 }
1074                 do_restart = 0;
1075                 nFireUpsNonRestart = nFireUps;
1076
1077                 /* Exit code 0 means the watcher should exit */
1078                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1079                         do_restart = 0;
1080                 }
1081
1082                 /* Exit code 101-109 means the watcher should exit */
1083                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1084                         do_restart = 0;
1085                 }
1086
1087                 /* Any other exit code, or no exit code, means we should restart. */
1088                 else {
1089                         do_restart = 1;
1090                         nFireUps++;
1091                         ForkedPid = current_child;
1092                 }
1093
1094         } while (do_restart);
1095
1096         unlink(file_pid_file);
1097         exit(WEXITSTATUS(status));
1098 }
1099
1100
1101
1102 void checkcrash(void)
1103 {
1104         if (nFireUpsNonRestart != nFireUps)
1105         {
1106                 StrBuf *CrashMail;
1107
1108                 CrashMail = NewStrBuf();
1109                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
1110                 StrBufPrintf(CrashMail,
1111                         " \n"
1112                         " The Citadel server process (citserver) terminated unexpectedly."
1113                         "\n \n"
1114                         " This could be the result of a bug in the server program, or some external "
1115                         "factor.\n \n"
1116                         " You can obtain more information about this by enabling core dumps.\n \n"
1117                         " For more information, please see:\n \n"
1118                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1119                         "\n \n"
1120
1121                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1122                         ,
1123                         ctdl_run_dir, ForkedPid);
1124                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1125                 FreeStrBuf(&CrashMail);
1126         }
1127 }
1128
1129
1130 /*
1131  * Generic routine to convert a login name to a full name (gecos)
1132  * Returns nonzero if a conversion took place
1133  */
1134 int convert_login(char NameToConvert[]) {
1135         struct passwd *pw;
1136         int a;
1137
1138         pw = getpwnam(NameToConvert);
1139         if (pw == NULL) {
1140                 return(0);
1141         }
1142         else {
1143                 strcpy(NameToConvert, pw->pw_gecos);
1144                 for (a=0; a<strlen(NameToConvert); ++a) {
1145                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1146                 }
1147                 return(1);
1148         }
1149 }
1150
1151
1152
1153 /*
1154  * This loop just keeps going and going and going...
1155  */
1156 /*
1157  * FIXME:
1158  * This current implimentation of worker_thread creates a bottle neck in several situations
1159  * The first thing to remember is that a single thread can handle more than one connection at a time.
1160  * More threads mean less memory for the system to run in.
1161  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1162  * something to happen anywhere.
1163  * This current implimentation requires worker threads to wait in other locations, after it has
1164  * been committed to a single connection which is very wasteful.
1165  * As an extreme case consider this:
1166  * A slow client connects and this slow client sends only one character each second.
1167  * With this current implimentation a single worker thread is dispatched to handle that connection
1168  * until such times as the client timeout expires, an error occurs on the socket or the client
1169  * completes its transmission.
1170  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1171  * second interval between chars.
1172  *
1173  * It is my intention to re-write this code and the associated client_getln, client_read functions
1174  * to allow any thread to read data on behalf of any connection (context).
1175  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1176  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1177  * process it.
1178  * This worker thread loop also needs to be able to handle binary data.
1179  */
1180
1181 void *worker_thread(void *arg) {
1182         int highest;
1183         CitContext *ptr;
1184         CitContext *bind_me = NULL;
1185         fd_set readfds;
1186         int retval = 0;
1187         struct timeval tv;
1188         int force_purge = 0;
1189
1190
1191         while (!CtdlThreadCheckStop()) {
1192
1193                 /* make doubly sure we're not holding any stale db handles
1194                  * which might cause a deadlock.
1195                  */
1196                 cdb_check_handles();
1197 do_select:      force_purge = 0;
1198                 bind_me = NULL;         /* Which session shall we handle? */
1199
1200                 /* Initialize the fdset. */
1201                 FD_ZERO(&readfds);
1202                 highest = 0;
1203
1204                 begin_critical_section(S_SESSION_TABLE);
1205                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1206                         int client_socket;
1207                         client_socket = ptr->client_socket;
1208                         /* Dont select on dead sessions only truly idle ones */
1209                         if ((ptr->state == CON_IDLE) &&
1210                             (CC->kill_me == 0) &&
1211                             (client_socket != -1))
1212                         {
1213                                 FD_SET(client_socket, &readfds);
1214                                 if (client_socket > highest)
1215                                         highest = client_socket;
1216                         }
1217                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1218                                 bind_me = ptr;
1219                                 ptr->state = CON_EXECUTING;
1220                                 break;
1221                         }
1222                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1223                                 bind_me = ptr;
1224                                 ptr->state = CON_STARTING;
1225                                 break;
1226                         }
1227                 }
1228                 end_critical_section(S_SESSION_TABLE);
1229
1230                 if (bind_me) {
1231                         goto SKIP_SELECT;
1232                 }
1233
1234                 /* If we got this far, it means that there are no sessions
1235                  * which a previous thread marked for attention, so we go
1236                  * ahead and get ready to select().
1237                  */
1238
1239                 if (!CtdlThreadCheckStop()) {
1240                         tv.tv_sec = 1;          /* wake up every second if no input */
1241                         tv.tv_usec = 0;
1242                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1243                 }
1244                 else
1245                         return NULL;
1246
1247                 /* Now figure out who made this select() unblock.
1248                  * First, check for an error or exit condition.
1249                  */
1250                 if (retval < 0) {
1251                         if (errno == EBADF) {
1252                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1253                                         strerror(errno));
1254                                 goto do_select;
1255                         }
1256                         if (errno != EINTR) {
1257                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1258                                 CtdlThreadStopAll();
1259                                 continue;
1260                         } else {
1261                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1262                                 if (CtdlThreadCheckStop()) return(NULL);
1263                                 goto do_select;
1264                         }
1265                 }
1266                 else if(retval == 0) {
1267                         if (CtdlThreadCheckStop()) return(NULL);
1268                 }
1269
1270                 /* It must be a client socket.  Find a context that has data
1271                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1272                  * active sockets other than our chosen one are marked as
1273                  * CON_READY so the next thread that comes around can just bind
1274                  * to one without having to select() again.
1275                  */
1276                 begin_critical_section(S_SESSION_TABLE);
1277                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1278                         int checkfd = ptr->client_socket;
1279                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1280                                 if (FD_ISSET(checkfd, &readfds)) {
1281                                         ptr->input_waiting = 1;
1282                                         if (!bind_me) {
1283                                                 bind_me = ptr;  /* I choose you! */
1284                                                 bind_me->state = CON_EXECUTING;
1285                                         }
1286                                         else {
1287                                                 ptr->state = CON_READY;
1288                                         }
1289                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1290                                         if (!bind_me) {
1291                                                 bind_me = ptr;  /* I choose you! */
1292                                                 bind_me->state = CON_EXECUTING;
1293                                         }
1294                                         else {
1295                                                 ptr->state = CON_READY;
1296                                         }
1297                                 }
1298                         }
1299                 }
1300                 end_critical_section(S_SESSION_TABLE);
1301
1302 SKIP_SELECT:
1303                 /* We're bound to a session */
1304                 if (bind_me != NULL) {
1305                         become_session(bind_me);
1306
1307                         if (bind_me->state == CON_STARTING) {
1308                                 bind_me->state = CON_EXECUTING;
1309                                 begin_session(bind_me);
1310                                 bind_me->h_greeting_function();
1311                         }
1312                         /* If the client has sent a command, execute it. */
1313                         if (CC->input_waiting) {
1314                                 CC->h_command_function();
1315
1316                                 while (HaveMoreLinesWaiting(CC))
1317                                        CC->h_command_function();
1318
1319                                 CC->input_waiting = 0;
1320                         }
1321
1322                         /* If there are asynchronous messages waiting and the
1323                          * client supports it, do those now */
1324                         if ((CC->is_async) && (CC->async_waiting)
1325                            && (CC->h_async_function != NULL)) {
1326                                 CC->h_async_function();
1327                                 CC->async_waiting = 0;
1328                         }
1329
1330                         force_purge = CC->kill_me;
1331                         become_session(NULL);
1332                         bind_me->state = CON_IDLE;
1333                 }
1334
1335                 dead_session_purge(force_purge);
1336                 do_housekeeping();
1337         }
1338         /* If control reaches this point, the server is shutting down */
1339         return(NULL);
1340 }
1341
1342
1343
1344
1345 /*
1346  * A function to handle selecting on master sockets.
1347  * In other words it handles new connections.
1348  * It is a thread.
1349  */
1350 void *select_on_master (void *arg)
1351 {
1352         struct ServiceFunctionHook *serviceptr;
1353         fd_set master_fds;
1354         int highest;
1355         struct timeval tv;
1356         int ssock;                      /* Descriptor for client socket */
1357         CitContext *con= NULL;  /* Temporary context pointer */
1358         int m;
1359         int i;
1360         int retval;
1361         struct CitContext select_on_master_CC;
1362
1363         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1364         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1365
1366         while (!CtdlThreadCheckStop()) {
1367                 /* Initialize the fdset. */
1368                 FD_ZERO(&master_fds);
1369                 highest = 0;
1370
1371                 /* First, add the various master sockets to the fdset. */
1372                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1373                 serviceptr = serviceptr->next ) {
1374                         m = serviceptr->msock;
1375                         FD_SET(m, &master_fds);
1376                         if (m > highest) {
1377                                 highest = m;
1378                         }
1379                 }
1380
1381                 if (!CtdlThreadCheckStop()) {
1382                         tv.tv_sec = 60;         /* wake up every second if no input */
1383                         tv.tv_usec = 0;
1384                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1385                 }
1386                 else
1387                         return NULL;
1388
1389                 /* Now figure out who made this select() unblock.
1390                  * First, check for an error or exit condition.
1391                  */
1392                 if (retval < 0) {
1393                         if (errno == EBADF) {
1394                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1395                                         strerror(errno));
1396                                 continue;
1397                         }
1398                         if (errno != EINTR) {
1399                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1400                                 CtdlThreadStopAll();
1401                         } else {
1402                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1403                                 if (CtdlThreadCheckStop()) return(NULL);
1404                                 continue;
1405                         }
1406                 }
1407                 else if(retval == 0) {
1408                         if (CtdlThreadCheckStop()) return(NULL);
1409                         continue;
1410                 }
1411                 /* Next, check to see if it's a new client connecting
1412                  * on a master socket.
1413                  */
1414                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1415                      serviceptr = serviceptr->next ) {
1416
1417                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1418                                 ssock = accept(serviceptr->msock, NULL, 0);
1419                                 if (ssock >= 0) {
1420                                         CtdlLogPrintf(CTDL_DEBUG,
1421                                                 "New client socket %d\n",
1422                                                 ssock);
1423
1424                                         /* The master socket is non-blocking but the client
1425                                          * sockets need to be blocking, otherwise certain
1426                                          * operations barf on FreeBSD.  Not a fatal error.
1427                                          */
1428                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1429                                                 CtdlLogPrintf(CTDL_EMERG,
1430                                                         "citserver: Can't set socket to blocking: %s\n",
1431                                                         strerror(errno));
1432                                         }
1433
1434                                         /* New context will be created already
1435                                          * set up in the CON_EXECUTING state.
1436                                          */
1437                                         con = CreateNewContext();
1438
1439                                         /* Assign our new socket number to it. */
1440                                         con->client_socket = ssock;
1441                                         con->h_command_function =
1442                                                 serviceptr->h_command_function;
1443                                         con->h_async_function =
1444                                                 serviceptr->h_async_function;
1445                                         con->h_greeting_function = serviceptr->h_greeting_function;
1446                                         con->ServiceName =
1447                                                 serviceptr->ServiceName;
1448
1449                                         /* Determine whether it's a local socket */
1450                                         if (serviceptr->sockpath != NULL)
1451                                                 con->is_local_socket = 1;
1452
1453                                         /* Set the SO_REUSEADDR socket option */
1454                                         i = 1;
1455                                         setsockopt(ssock, SOL_SOCKET,
1456                                                 SO_REUSEADDR,
1457                                                 &i, sizeof(i));
1458
1459                                         con->state = CON_GREETING;
1460
1461                                         retval--;
1462                                         if (retval == 0)
1463                                                 break;
1464                                 }
1465                         }
1466                 }
1467         }
1468         CtdlClearSystemContext();
1469
1470         return NULL;
1471 }
1472
1473
1474
1475 /*
1476  * SyslogFacility()
1477  * Translate text facility name to syslog.h defined value.
1478  */
1479 int SyslogFacility(char *name)
1480 {
1481         int i;
1482         struct
1483         {
1484                 int facility;
1485                 char *name;
1486         }   facTbl[] =
1487         {
1488                 {   LOG_KERN,   "kern"          },
1489                 {   LOG_USER,   "user"          },
1490                 {   LOG_MAIL,   "mail"          },
1491                 {   LOG_DAEMON, "daemon"        },
1492                 {   LOG_AUTH,   "auth"          },
1493                 {   LOG_SYSLOG, "syslog"        },
1494                 {   LOG_LPR,    "lpr"           },
1495                 {   LOG_NEWS,   "news"          },
1496                 {   LOG_UUCP,   "uucp"          },
1497                 {   LOG_LOCAL0, "local0"        },
1498                 {   LOG_LOCAL1, "local1"        },
1499                 {   LOG_LOCAL2, "local2"        },
1500                 {   LOG_LOCAL3, "local3"        },
1501                 {   LOG_LOCAL4, "local4"        },
1502                 {   LOG_LOCAL5, "local5"        },
1503                 {   LOG_LOCAL6, "local6"        },
1504                 {   LOG_LOCAL7, "local7"        },
1505                 {   0,            NULL          }
1506         };
1507         for(i = 0; facTbl[i].name != NULL; i++) {
1508                 if(!strcasecmp(name, facTbl[i].name))
1509                         return facTbl[i].facility;
1510         }
1511         enable_syslog = 0;
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                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1618                         thisheap->file, thisheap->line);
1619         }
1620 }
1621
1622 #endif /*  DEBUG_MEMORY_LEAKS */