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         Ctx = CC;
 516
 517 #ifdef BIGBAD_IODBG
 518         {
 519                 int rv = 0;
 520                 char fn [SIZ];
 521                 FILE *fd;
 522
 523                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 524
 525                 fd = fopen(fn, "a+");
 526                 fprintf(fd, "Sending: BufSize: %d BufContent: [",
 527                         nbytes);
 528                 rv = fwrite(buf, nbytes, 1, fd);
 529                 fprintf(fd, "]\n");
 530
 531
 532                 fclose(fd);
 533         }
 534 #endif
 535 //      flush_client_inbuf();
 536         if (Ctx->redirect_buffer != NULL) {
 537                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 538                                      buf, nbytes, 0);
 539                 return 0;
 540         }
 541
 542 #ifdef HAVE_OPENSSL
 543         if (Ctx->redirect_ssl) {
 544                 client_write_ssl(buf, nbytes);
 545                 return 0;
 546         }
 547 #endif
 548         if (Ctx->client_socket == -1) return -1;
 549
 550         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 551
 552         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 553                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 554                         FD_ZERO(&wset);
 555                         FD_SET(Ctx->client_socket, &wset);
 556                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 557                                 if (errno == EINTR)
 558                                 {
 559                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 560                                         if (CtdlThreadCheckStop()) {
 561                                                 CC->kill_me = 1;
 562                                                 return (-1);
 563                                         } else {
 564                                                 /* can't trust fd's and stuff so we need to re-create them */
 565                                                 continue;
 566                                         }
 567                                 } else {
 568                                         CtdlLogPrintf(CTDL_ERR,
 569                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 570                                                 nbytes - bytes_written,
 571                                                 strerror(errno), errno);
 572                                         cit_backtrace();
 573                                         Ctx->kill_me = 1;
 574                                         return -1;
 575                                 }
 576                         }
 577                 }
 578
 579                 retval = write(Ctx->client_socket, &buf[bytes_written],
 580                         nbytes - bytes_written);
 581                 if (retval < 1) {
 582                         CtdlLogPrintf(CTDL_ERR,
 583                                 "client_write(%d bytes) failed: %s (%d)\n",
 584                                 nbytes - bytes_written,
 585                                 strerror(errno), errno);
 586                         cit_backtrace();
 587                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 588                         Ctx->kill_me = 1;
 589                         return -1;
 590                 }
 591                 bytes_written = bytes_written + retval;
 592         }
 593         return 0;
 594 }
 595
 596 void cputbuf(const StrBuf *Buf) {
 597         client_write(ChrPtr(Buf), StrLength(Buf));
 598 }
 599
 600
 601 /*
 602  * cprintf()    Send formatted printable data to the client.
 603  *              Implemented in terms of client_write() so it's technically not sysdep...
 604  */
 605 void cprintf(const char *format, ...) {
 606         va_list arg_ptr;
 607         char buf[1024];
 608
 609         va_start(arg_ptr, format);
 610         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 611                 buf[sizeof buf - 2] = '\n';
 612         client_write(buf, strlen(buf));
 613         va_end(arg_ptr);
 614 }
 615
 616
 617 /*
 618  * Read data from the client socket.
 619  *
 620  * sock         socket fd to read from
 621  * buf          buffer to read into
 622  * bytes        number of bytes to read
 623  * timeout      Number of seconds to wait before timing out
 624  *
 625  * Possible return values:
 626  *      1       Requested number of bytes has been read.
 627  *      0       Request timed out.
 628  *      -1      Connection is broken, or other error.
 629  */
 630 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 631 {
 632         CitContext *CCC=CC;
 633         const char *Error;
 634         int retval = 0;
 635
 636 #ifdef HAVE_OPENSSL
 637         if (CCC->redirect_ssl) {
 638 #ifdef BIGBAD_IODBG
 639                 int rv = 0;
 640                 char fn [SIZ];
 641                 FILE *fd;
 642
 643                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 644
 645                 fd = fopen(fn, "a+");
 646                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 647                         bytes);
 648                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 649                 fprintf(fd, "]\n");
 650
 651
 652                 fclose(fd);
 653 #endif
 654                 retval = client_read_sslblob(Target, bytes, timeout);
 655                 if (retval < 0) {
 656                         CtdlLogPrintf(CTDL_CRIT,
 657                                       "%s failed\n",
 658                                       __FUNCTION__);
 659                 }
 660 #ifdef BIGBAD_IODBG
 661                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 662
 663                 fd = fopen(fn, "a+");
 664                 fprintf(fd, "Read: %d BufContent: [",
 665                         StrLength(Target));
 666                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 667                 fprintf(fd, "]\n");
 668
 669
 670                 fclose(fd);
 671 #endif
 672         }
 673         else
 674 #endif
 675         {
 676 #ifdef BIGBAD_IODBG
 677                 int rv = 0;
 678                 char fn [SIZ];
 679                 FILE *fd;
 680
 681                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 682
 683                 fd = fopen(fn, "a+");
 684                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 685                         bytes);
 686                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 687                 fprintf(fd, "]\n");
 688
 689
 690                 fclose(fd);
 691 #endif
 692                 retval = StrBufReadBLOBBuffered(Target,
 693                                                 CCC->ReadBuf,
 694                                                 &CCC->Pos,
 695                                                 &CCC->client_socket,
 696                                                 1,
 697                                                 bytes,
 698                                                 O_TERM,
 699                                                 &Error);
 700                 if (retval < 0) {
 701                         CtdlLogPrintf(CTDL_CRIT,
 702                                       "%s failed: %s\n",
 703                                       __FUNCTION__,
 704                                       Error);
 705                         return retval;
 706                 }
 707 #ifdef BIGBAD_IODBG
 708                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 709
 710                 fd = fopen(fn, "a+");
 711                 fprintf(fd, "Read: %d BufContent: [",
 712                         StrLength(Target));
 713                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 714                 fprintf(fd, "]\n");
 715
 716
 717                 fclose(fd);
 718 #endif
 719         }
 720         return retval;
 721 }
 722
 723
 724 /*
 725  * to make client_read_random_blob() more efficient, increase buffer size.
 726  * just use in greeting function, else your buffer may be flushed
 727  */
 728 void client_set_inbound_buf(long N)
 729 {
 730         FlushStrBuf(CC->ReadBuf);
 731         ReAdjustEmptyBuf(CC->ReadBuf, N * SIZ, N * SIZ);
 732 }
 733
 734 int client_read_random_blob(StrBuf *Target, int timeout)
 735 {
 736         CitContext *CCC=CC;
 737         int rc;
 738
 739         rc =  client_read_blob(Target, 1, timeout);
 740         if (rc > 0)
 741         {
 742                 long len;
 743                 const char *pch;
 744
 745                 len = StrLength(CCC->ReadBuf);
 746                 pch = ChrPtr(CCC->ReadBuf);
 747
 748                 if (len > 0)
 749                 {
 750                         if (CCC->Pos != NULL) {
 751                                 len -= CCC->Pos - pch;
 752                                 pch = CCC->Pos;
 753                         }
 754                         StrBufAppendBufPlain(Target, pch, len, 0);
 755                         FlushStrBuf(CCC->ReadBuf);
 756                         CCC->Pos = NULL;
 757 #ifdef BIGBAD_IODBG
 758                         {
 759                                 int rv = 0;
 760                                 char fn [SIZ];
 761                                 FILE *fd;
 762
 763                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 764
 765                                 fd = fopen(fn, "a+");
 766                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 767                                         StrLength(Target));
 768                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 769                                 fprintf(fd, "]\n");
 770
 771
 772                                 fclose(fd);
 773                         }
 774 #endif
 775
 776                         return StrLength(Target);
 777                 }
 778                 return rc;
 779         }
 780         else
 781                 return rc;
 782 }
 783
 784 int client_read_to(char *buf, int bytes, int timeout)
 785 {
 786         CitContext *CCC=CC;
 787         int rc;
 788
 789         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 790         if (rc < 0)
 791         {
 792                 *buf = '\0';
 793                 return rc;
 794         }
 795         else
 796         {
 797                 memcpy(buf,
 798                        ChrPtr(CCC->MigrateBuf),
 799                        StrLength(CCC->MigrateBuf) + 1);
 800                 FlushStrBuf(CCC->MigrateBuf);
 801                 return rc;
 802         }
 803 }
 804
 805
 806 int HaveMoreLinesWaiting(CitContext *CCC)
 807 {
 808         if ((CCC->kill_me == 1) || (
 809             (CCC->Pos == NULL) &&
 810             (StrLength(CCC->ReadBuf) == 0) &&
 811             (CCC->client_socket != -1)) )
 812                 return 0;
 813         else
 814                 return 1;
 815 }
 816
 817
 818 /*
 819  * Read data from the client socket with default timeout.
 820  * (This is implemented in terms of client_read_to() and could be
 821  * justifiably moved out of sysdep.c)
 822  */
 823 INLINE int client_read(char *buf, int bytes)
 824 {
 825         return(client_read_to(buf, bytes, config.c_sleeping));
 826 }
 827
 828 int CtdlClientGetLine(StrBuf *Target)
 829 {
 830         CitContext *CCC=CC;
 831         const char *Error;
 832         int rc;
 833
 834         FlushStrBuf(Target);
 835 #ifdef HAVE_OPENSSL
 836         if (CCC->redirect_ssl) {
 837 #ifdef BIGBAD_IODBG
 838                 char fn [SIZ];
 839                 FILE *fd;
 840                 int len = 0;
 841                 int rlen = 0;
 842                 int  nlen = 0;
 843                 int nrlen = 0;
 844                 const char *pch;
 845
 846                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 847
 848                 fd = fopen(fn, "a+");
 849                 pch = ChrPtr(CCC->ReadBuf);
 850                 len = StrLength(CCC->ReadBuf);
 851                 if (CCC->Pos != NULL)
 852                         rlen = CC->Pos - pch;
 853                 else
 854                         rlen = 0;
 855
 856 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 857                         len, rlen, pch);
 858 */
 859                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 860                         len, rlen);
 861 #endif
 862                 rc = client_readline_sslbuffer(Target,
 863                                                CCC->ReadBuf,
 864                                                &CCC->Pos,
 865                                                1);
 866 #ifdef BIGBAD_IODBG
 867                 pch = ChrPtr(CCC->ReadBuf);
 868                 nlen = StrLength(CCC->ReadBuf);
 869                 if (CCC->Pos != NULL)
 870                         nrlen = CC->Pos - pch;
 871                 else
 872                         nrlen = 0;
 873 /*
 874                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 875                         len, nlen, rlen, nrlen, pch);
 876 */
 877                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 878                         len, nlen, rlen, nrlen);
 879
 880                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 881                         StrLength(Target), ChrPtr(Target));
 882                 fclose(fd);
 883
 884                 if (rc < 0)
 885                         CtdlLogPrintf(CTDL_CRIT,
 886                                       "%s failed\n",
 887                                       __FUNCTION__);
 888 #endif
 889                 return rc;
 890         }
 891         else
 892 #endif
 893         {
 894 #ifdef BIGBAD_IODBG
 895                 char fn [SIZ];
 896                 FILE *fd;
 897                 int len, rlen, nlen, nrlen;
 898                 const char *pch;
 899
 900                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 901
 902                 fd = fopen(fn, "a+");
 903                 pch = ChrPtr(CCC->ReadBuf);
 904                 len = StrLength(CCC->ReadBuf);
 905                 if (CCC->Pos != NULL)
 906                         rlen = CC->Pos - pch;
 907                 else
 908                         rlen = 0;
 909
 910 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 911                         len, rlen, pch);
 912 */
 913                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 914                         len, rlen);
 915 #endif
 916                 rc = StrBufTCP_read_buffered_line_fast(Target,
 917                                                        CCC->ReadBuf,
 918                                                        &CCC->Pos,
 919                                                        &CCC->client_socket,
 920                                                        5,
 921                                                        1,
 922                                                        &Error);
 923
 924 #ifdef BIGBAD_IODBG
 925                 pch = ChrPtr(CCC->ReadBuf);
 926                 nlen = StrLength(CCC->ReadBuf);
 927                 if (CCC->Pos != NULL)
 928                         nrlen = CC->Pos - pch;
 929                 else
 930                         nrlen = 0;
 931 /*
 932                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 933                         len, nlen, rlen, nrlen, pch);
 934 */
 935                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 936                         len, nlen, rlen, nrlen);
 937
 938                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 939                         StrLength(Target), ChrPtr(Target));
 940                 fclose(fd);
 941
 942                 if ((rc < 0) && (Error != NULL))
 943                         CtdlLogPrintf(CTDL_CRIT,
 944                                       "%s failed: %s\n",
 945                                       __FUNCTION__,
 946                                       Error);
 947 #endif
 948                 return rc;
 949         }
 950 }
 951
 952
 953 /*
 954  * client_getln()   ...   Get a LF-terminated line of text from the client.
 955  * (This is implemented in terms of client_read() and could be
 956  * justifiably moved out of sysdep.c)
 957  */
 958 int client_getln(char *buf, int bufsize)
 959 {
 960         int i, retval;
 961         CitContext *CCC=CC;
 962         const char *pCh;
 963
 964         retval = CtdlClientGetLine(CCC->MigrateBuf);
 965         if (retval < 0)
 966           return(retval >= 0);
 967
 968
 969         i = StrLength(CCC->MigrateBuf);
 970         pCh = ChrPtr(CCC->MigrateBuf);
 971         /* Strip the trailing LF, and the trailing CR if present.
 972          */
 973         if (bufsize <= i)
 974                 i = bufsize - 1;
 975         while ( (i > 0)
 976                 && ( (pCh[i - 1]==13)
 977                      || ( pCh[i - 1]==10)) ) {
 978                 i--;
 979         }
 980         memcpy(buf, pCh, i);
 981         buf[i] = 0;
 982
 983         FlushStrBuf(CCC->MigrateBuf);
 984         if (retval < 0) {
 985                 safestrncpy(&buf[i], "000", bufsize - i);
 986         }
 987         return(retval >= 0);
 988 }
 989
 990
 991 /*
 992  * Cleanup any contexts that are left lying around
 993  */
 994
 995
 996 void close_masters (void)
 997 {
 998         struct ServiceFunctionHook *serviceptr;
 999
1000         /*
1001          * close all protocol master sockets
1002          */
1003         for (serviceptr = ServiceHookTable; serviceptr != NULL;
1004             serviceptr = serviceptr->next ) {
1005
1006                 if (serviceptr->tcp_port > 0)
1007                 {
1008                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
1009                                 serviceptr->tcp_port);
1010                         serviceptr->tcp_port = 0;
1011                 }
1012
1013                 if (serviceptr->sockpath != NULL)
1014                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
1015                                 serviceptr->sockpath);
1016
1017                 close(serviceptr->msock);
1018                 /* If it's a Unix domain socket, remove the file. */
1019                 if (serviceptr->sockpath != NULL) {
1020                         unlink(serviceptr->sockpath);
1021                         serviceptr->sockpath = NULL;
1022                 }
1023         }
1024 }
1025
1026
1027 /*
1028  * The system-dependent part of master_cleanup() - close the master socket.
1029  */
1030 void sysdep_master_cleanup(void) {
1031
1032         close_masters();
1033
1034         context_cleanup();
1035
1036 #ifdef HAVE_OPENSSL
1037         destruct_ssl();
1038 #endif
1039         CtdlDestroyProtoHooks();
1040         CtdlDestroyDeleteHooks();
1041         CtdlDestroyXmsgHooks();
1042         CtdlDestroyNetprocHooks();
1043         CtdlDestroyUserHooks();
1044         CtdlDestroyMessageHook();
1045         CtdlDestroyCleanupHooks();
1046         CtdlDestroyFixedOutputHooks();
1047         CtdlDestroySessionHooks();
1048         CtdlDestroyServiceHook();
1049         CtdlDestroyRoomHooks();
1050         #ifdef HAVE_BACKTRACE
1051 ///     eCrash_Uninit();
1052         #endif
1053 }
1054
1055
1056
1057 pid_t current_child;
1058 void graceful_shutdown(int signum) {
1059         kill(current_child, signum);
1060         unlink(file_pid_file);
1061         exit(0);
1062 }
1063
1064 int nFireUps = 0;
1065 int nFireUpsNonRestart = 0;
1066 pid_t ForkedPid = 1;
1067
1068 /*
1069  * Start running as a daemon.
1070  */
1071 void start_daemon(int unused) {
1072         int status = 0;
1073         pid_t child = 0;
1074         FILE *fp;
1075         int do_restart = 0;
1076
1077         current_child = 0;
1078
1079         /* Close stdin/stdout/stderr and replace them with /dev/null.
1080          * We don't just call close() because we don't want these fd's
1081          * to be reused for other files.
1082          */
1083         if (chdir(ctdl_run_dir) != 0)
1084                 CtdlLogPrintf(CTDL_EMERG,
1085                               "unable to change into directory [%s]: %s",
1086                               ctdl_run_dir, strerror(errno));
1087
1088         child = fork();
1089         if (child != 0) {
1090                 exit(0);
1091         }
1092
1093         signal(SIGHUP, SIG_IGN);
1094         signal(SIGINT, SIG_IGN);
1095         signal(SIGQUIT, SIG_IGN);
1096
1097         setsid();
1098         umask(0);
1099         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1100             (freopen("/dev/null", "w", stdout) != stdout) ||
1101             (freopen("/dev/null", "w", stderr) != stderr))
1102                 CtdlLogPrintf(CTDL_EMERG,
1103                               "unable to reopen stdin/out/err %s",
1104                               strerror(errno));
1105
1106
1107         do {
1108                 current_child = fork();
1109
1110                 signal(SIGTERM, graceful_shutdown);
1111
1112                 if (current_child < 0) {
1113                         perror("fork");
1114                         exit(errno);
1115                 }
1116
1117                 else if (current_child == 0) {
1118                         return; /* continue starting citadel. */
1119                 }
1120
1121                 else {
1122                         fp = fopen(file_pid_file, "w");
1123                         if (fp != NULL) {
1124                                 fprintf(fp, ""F_PID_T"\n", getpid());
1125                                 fclose(fp);
1126                         }
1127                         waitpid(current_child, &status, 0);
1128                 }
1129                 do_restart = 0;
1130                 nFireUpsNonRestart = nFireUps;
1131
1132                 /* Exit code 0 means the watcher should exit */
1133                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1134                         do_restart = 0;
1135                 }
1136
1137                 /* Exit code 101-109 means the watcher should exit */
1138                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1139                         do_restart = 0;
1140                 }
1141
1142                 /* Any other exit code, or no exit code, means we should restart. */
1143                 else {
1144                         do_restart = 1;
1145                         nFireUps++;
1146                         ForkedPid = current_child;
1147                 }
1148
1149         } while (do_restart);
1150
1151         unlink(file_pid_file);
1152         exit(WEXITSTATUS(status));
1153 }
1154
1155
1156
1157 void checkcrash(void)
1158 {
1159         if (nFireUpsNonRestart != nFireUps)
1160         {
1161                 StrBuf *CrashMail;
1162
1163                 CrashMail = NewStrBuf();
1164                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
1165                 StrBufPrintf(CrashMail,
1166                         " \n"
1167                         " The Citadel server process (citserver) terminated unexpectedly."
1168                         "\n \n"
1169                         " This could be the result of a bug in the server program, or some external "
1170                         "factor.\n \n"
1171                         " You can obtain more information about this by enabling core dumps.\n \n"
1172                         " For more information, please see:\n \n"
1173                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1174                         "\n \n"
1175
1176                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1177                         ,
1178                         ctdl_run_dir, ForkedPid);
1179                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1180                 FreeStrBuf(&CrashMail);
1181         }
1182 }
1183
1184
1185 /*
1186  * Generic routine to convert a login name to a full name (gecos)
1187  * Returns nonzero if a conversion took place
1188  */
1189 int convert_login(char NameToConvert[]) {
1190         struct passwd *pw;
1191         int a;
1192
1193         pw = getpwnam(NameToConvert);
1194         if (pw == NULL) {
1195                 return(0);
1196         }
1197         else {
1198                 strcpy(NameToConvert, pw->pw_gecos);
1199                 for (a=0; a<strlen(NameToConvert); ++a) {
1200                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1201                 }
1202                 return(1);
1203         }
1204 }
1205
1206
1207
1208 /*
1209  * This loop just keeps going and going and going...
1210  */
1211 /*
1212  * FIXME:
1213  * This current implimentation of worker_thread creates a bottle neck in several situations
1214  * The first thing to remember is that a single thread can handle more than one connection at a time.
1215  * More threads mean less memory for the system to run in.
1216  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1217  * something to happen anywhere.
1218  * This current implimentation requires worker threads to wait in other locations, after it has
1219  * been committed to a single connection which is very wasteful.
1220  * As an extreme case consider this:
1221  * A slow client connects and this slow client sends only one character each second.
1222  * With this current implimentation a single worker thread is dispatched to handle that connection
1223  * until such times as the client timeout expires, an error occurs on the socket or the client
1224  * completes its transmission.
1225  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1226  * second interval between chars.
1227  *
1228  * It is my intention to re-write this code and the associated client_getln, client_read functions
1229  * to allow any thread to read data on behalf of any connection (context).
1230  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1231  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1232  * process it.
1233  * This worker thread loop also needs to be able to handle binary data.
1234  */
1235
1236 void *worker_thread(void *arg) {
1237         int highest;
1238         CitContext *ptr;
1239         CitContext *bind_me = NULL;
1240         fd_set readfds;
1241         int retval = 0;
1242         struct timeval tv;
1243         int force_purge = 0;
1244
1245
1246         while (!CtdlThreadCheckStop()) {
1247
1248                 /* make doubly sure we're not holding any stale db handles
1249                  * which might cause a deadlock.
1250                  */
1251                 cdb_check_handles();
1252 do_select:      force_purge = 0;
1253                 bind_me = NULL;         /* Which session shall we handle? */
1254
1255                 /* Initialize the fdset. */
1256                 FD_ZERO(&readfds);
1257                 highest = 0;
1258
1259                 begin_critical_section(S_SESSION_TABLE);
1260                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1261                         int client_socket;
1262                         client_socket = ptr->client_socket;
1263                         /* Dont select on dead sessions only truly idle ones */
1264                         if ((ptr->state == CON_IDLE) &&
1265                             (CC->kill_me == 0) &&
1266                             (client_socket != -1))
1267                         {
1268                                 FD_SET(client_socket, &readfds);
1269                                 if (client_socket > highest)
1270                                         highest = client_socket;
1271                         }
1272                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1273                                 bind_me = ptr;
1274                                 ptr->state = CON_EXECUTING;
1275                                 break;
1276                         }
1277                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1278                                 bind_me = ptr;
1279                                 ptr->state = CON_STARTING;
1280                                 break;
1281                         }
1282                 }
1283                 end_critical_section(S_SESSION_TABLE);
1284
1285                 if (bind_me) {
1286                         goto SKIP_SELECT;
1287                 }
1288
1289                 /* If we got this far, it means that there are no sessions
1290                  * which a previous thread marked for attention, so we go
1291                  * ahead and get ready to select().
1292                  */
1293
1294                 if (!CtdlThreadCheckStop()) {
1295                         tv.tv_sec = 1;          /* wake up every second if no input */
1296                         tv.tv_usec = 0;
1297                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1298                 }
1299                 else
1300                         return NULL;
1301
1302                 /* Now figure out who made this select() unblock.
1303                  * First, check for an error or exit condition.
1304                  */
1305                 if (retval < 0) {
1306                         if (errno == EBADF) {
1307                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1308                                         strerror(errno));
1309                                 goto do_select;
1310                         }
1311                         if (errno != EINTR) {
1312                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1313                                 CtdlThreadStopAll();
1314                                 continue;
1315                         } else {
1316                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1317                                 if (CtdlThreadCheckStop()) return(NULL);
1318                                 goto do_select;
1319                         }
1320                 }
1321                 else if(retval == 0) {
1322                         if (CtdlThreadCheckStop()) return(NULL);
1323                 }
1324
1325                 /* It must be a client socket.  Find a context that has data
1326                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1327                  * active sockets other than our chosen one are marked as
1328                  * CON_READY so the next thread that comes around can just bind
1329                  * to one without having to select() again.
1330                  */
1331                 begin_critical_section(S_SESSION_TABLE);
1332                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1333                         int checkfd = ptr->client_socket;
1334                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1335                                 if (FD_ISSET(checkfd, &readfds)) {
1336                                         ptr->input_waiting = 1;
1337                                         if (!bind_me) {
1338                                                 bind_me = ptr;  /* I choose you! */
1339                                                 bind_me->state = CON_EXECUTING;
1340                                         }
1341                                         else {
1342                                                 ptr->state = CON_READY;
1343                                         }
1344                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1345                                         if (!bind_me) {
1346                                                 bind_me = ptr;  /* I choose you! */
1347                                                 bind_me->state = CON_EXECUTING;
1348                                         }
1349                                         else {
1350                                                 ptr->state = CON_READY;
1351                                         }
1352                                 }
1353                         }
1354                 }
1355                 end_critical_section(S_SESSION_TABLE);
1356
1357 SKIP_SELECT:
1358                 /* We're bound to a session */
1359                 if (bind_me != NULL) {
1360                         become_session(bind_me);
1361
1362                         if (bind_me->state == CON_STARTING) {
1363                                 bind_me->state = CON_EXECUTING;
1364                                 begin_session(bind_me);
1365                                 bind_me->h_greeting_function();
1366                         }
1367                         /* If the client has sent a command, execute it. */
1368                         if (CC->input_waiting) {
1369                                 CC->h_command_function();
1370
1371                                 while (HaveMoreLinesWaiting(CC))
1372                                        CC->h_command_function();
1373
1374                                 CC->input_waiting = 0;
1375                         }
1376
1377                         /* If there are asynchronous messages waiting and the
1378                          * client supports it, do those now */
1379                         if ((CC->is_async) && (CC->async_waiting)
1380                            && (CC->h_async_function != NULL)) {
1381                                 CC->h_async_function();
1382                                 CC->async_waiting = 0;
1383                         }
1384
1385                         force_purge = CC->kill_me;
1386                         become_session(NULL);
1387                         bind_me->state = CON_IDLE;
1388                 }
1389
1390                 dead_session_purge(force_purge);
1391                 do_housekeeping();
1392         }
1393         /* If control reaches this point, the server is shutting down */
1394         return(NULL);
1395 }
1396
1397
1398
1399
1400 /*
1401  * A function to handle selecting on master sockets.
1402  * In other words it handles new connections.
1403  * It is a thread.
1404  */
1405 void *select_on_master (void *arg)
1406 {
1407         struct ServiceFunctionHook *serviceptr;
1408         fd_set master_fds;
1409         int highest;
1410         struct timeval tv;
1411         int ssock;                      /* Descriptor for client socket */
1412         CitContext *con= NULL;  /* Temporary context pointer */
1413         int m;
1414         int i;
1415         int retval;
1416         struct CitContext select_on_master_CC;
1417
1418         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1419         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1420
1421         while (!CtdlThreadCheckStop()) {
1422                 /* Initialize the fdset. */
1423                 FD_ZERO(&master_fds);
1424                 highest = 0;
1425
1426                 /* First, add the various master sockets to the fdset. */
1427                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1428                 serviceptr = serviceptr->next ) {
1429                         m = serviceptr->msock;
1430                         FD_SET(m, &master_fds);
1431                         if (m > highest) {
1432                                 highest = m;
1433                         }
1434                 }
1435
1436                 if (!CtdlThreadCheckStop()) {
1437                         tv.tv_sec = 60;         /* wake up every second if no input */
1438                         tv.tv_usec = 0;
1439                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1440                 }
1441                 else
1442                         return NULL;
1443
1444                 /* Now figure out who made this select() unblock.
1445                  * First, check for an error or exit condition.
1446                  */
1447                 if (retval < 0) {
1448                         if (errno == EBADF) {
1449                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1450                                         strerror(errno));
1451                                 continue;
1452                         }
1453                         if (errno != EINTR) {
1454                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1455                                 CtdlThreadStopAll();
1456                         } else {
1457                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1458                                 if (CtdlThreadCheckStop()) return(NULL);
1459                                 continue;
1460                         }
1461                 }
1462                 else if(retval == 0) {
1463                         if (CtdlThreadCheckStop()) return(NULL);
1464                         continue;
1465                 }
1466                 /* Next, check to see if it's a new client connecting
1467                  * on a master socket.
1468                  */
1469                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1470                      serviceptr = serviceptr->next ) {
1471
1472                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1473                                 ssock = accept(serviceptr->msock, NULL, 0);
1474                                 if (ssock >= 0) {
1475                                         CtdlLogPrintf(CTDL_DEBUG,
1476                                                 "New client socket %d\n",
1477                                                 ssock);
1478
1479                                         /* The master socket is non-blocking but the client
1480                                          * sockets need to be blocking, otherwise certain
1481                                          * operations barf on FreeBSD.  Not a fatal error.
1482                                          */
1483                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1484                                                 CtdlLogPrintf(CTDL_EMERG,
1485                                                         "citserver: Can't set socket to blocking: %s\n",
1486                                                         strerror(errno));
1487                                         }
1488
1489                                         /* New context will be created already
1490                                          * set up in the CON_EXECUTING state.
1491                                          */
1492                                         con = CreateNewContext();
1493
1494                                         /* Assign our new socket number to it. */
1495                                         con->client_socket = ssock;
1496                                         con->h_command_function =
1497                                                 serviceptr->h_command_function;
1498                                         con->h_async_function =
1499                                                 serviceptr->h_async_function;
1500                                         con->h_greeting_function = serviceptr->h_greeting_function;
1501                                         con->ServiceName =
1502                                                 serviceptr->ServiceName;
1503
1504                                         /* Determine whether it's a local socket */
1505                                         if (serviceptr->sockpath != NULL)
1506                                                 con->is_local_socket = 1;
1507
1508                                         /* Set the SO_REUSEADDR socket option */
1509                                         i = 1;
1510                                         setsockopt(ssock, SOL_SOCKET,
1511                                                 SO_REUSEADDR,
1512                                                 &i, sizeof(i));
1513
1514                                         con->state = CON_GREETING;
1515
1516                                         retval--;
1517                                         if (retval == 0)
1518                                                 break;
1519                                 }
1520                         }
1521                 }
1522         }
1523         CtdlClearSystemContext();
1524
1525         return NULL;
1526 }
1527
1528
1529
1530 /*
1531  * SyslogFacility()
1532  * Translate text facility name to syslog.h defined value.
1533  */
1534 int SyslogFacility(char *name)
1535 {
1536         int i;
1537         struct
1538         {
1539                 int facility;
1540                 char *name;
1541         }   facTbl[] =
1542         {
1543                 {   LOG_KERN,   "kern"          },
1544                 {   LOG_USER,   "user"          },
1545                 {   LOG_MAIL,   "mail"          },
1546                 {   LOG_DAEMON, "daemon"        },
1547                 {   LOG_AUTH,   "auth"          },
1548                 {   LOG_SYSLOG, "syslog"        },
1549                 {   LOG_LPR,    "lpr"           },
1550                 {   LOG_NEWS,   "news"          },
1551                 {   LOG_UUCP,   "uucp"          },
1552                 {   LOG_LOCAL0, "local0"        },
1553                 {   LOG_LOCAL1, "local1"        },
1554                 {   LOG_LOCAL2, "local2"        },
1555                 {   LOG_LOCAL3, "local3"        },
1556                 {   LOG_LOCAL4, "local4"        },
1557                 {   LOG_LOCAL5, "local5"        },
1558                 {   LOG_LOCAL6, "local6"        },
1559                 {   LOG_LOCAL7, "local7"        },
1560                 {   0,            NULL          }
1561         };
1562         for(i = 0; facTbl[i].name != NULL; i++) {
1563                 if(!strcasecmp(name, facTbl[i].name))
1564                         return facTbl[i].facility;
1565         }
1566         enable_syslog = 0;
1567         return LOG_DAEMON;
1568 }
1569
1570
1571 /********** MEM CHEQQER ***********/
1572
1573 #ifdef DEBUG_MEMORY_LEAKS
1574
1575 #undef malloc
1576 #undef realloc
1577 #undef strdup
1578 #undef free
1579
1580 void *tracked_malloc(size_t size, char *file, int line) {
1581         struct igheap *thisheap;
1582         void *block;
1583
1584         block = malloc(size);
1585         if (block == NULL) return(block);
1586
1587         thisheap = malloc(sizeof(struct igheap));
1588         if (thisheap == NULL) {
1589                 free(block);
1590                 return(NULL);
1591         }
1592
1593         thisheap->block = block;
1594         strcpy(thisheap->file, file);
1595         thisheap->line = line;
1596
1597         begin_critical_section(S_DEBUGMEMLEAKS);
1598         thisheap->next = igheap;
1599         igheap = thisheap;
1600         end_critical_section(S_DEBUGMEMLEAKS);
1601
1602         return(block);
1603 }
1604
1605
1606 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1607         struct igheap *thisheap;
1608         void *block;
1609
1610         block = realloc(ptr, size);
1611         if (block == NULL) return(block);
1612
1613         thisheap = malloc(sizeof(struct igheap));
1614         if (thisheap == NULL) {
1615                 free(block);
1616                 return(NULL);
1617         }
1618
1619         thisheap->block = block;
1620         strcpy(thisheap->file, file);
1621         thisheap->line = line;
1622
1623         begin_critical_section(S_DEBUGMEMLEAKS);
1624         thisheap->next = igheap;
1625         igheap = thisheap;
1626         end_critical_section(S_DEBUGMEMLEAKS);
1627
1628         return(block);
1629 }
1630
1631
1632
1633 void tracked_free(void *ptr) {
1634         struct igheap *thisheap;
1635         struct igheap *trash;
1636
1637         free(ptr);
1638
1639         if (igheap == NULL) return;
1640         begin_critical_section(S_DEBUGMEMLEAKS);
1641         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1642                 if (thisheap->next != NULL) {
1643                         if (thisheap->next->block == ptr) {
1644                                 trash = thisheap->next;
1645                                 thisheap->next = thisheap->next->next;
1646                                 free(trash);
1647                         }
1648                 }
1649         }
1650         if (igheap->block == ptr) {
1651                 trash = igheap;
1652                 igheap = igheap->next;
1653                 free(trash);
1654         }
1655         end_critical_section(S_DEBUGMEMLEAKS);
1656 }
1657
1658 char *tracked_strdup(const char *s, char *file, int line) {
1659         char *ptr;
1660
1661         if (s == NULL) return(NULL);
1662         ptr = tracked_malloc(strlen(s) + 1, file, line);
1663         if (ptr == NULL) return(NULL);
1664         strncpy(ptr, s, strlen(s));
1665         return(ptr);
1666 }
1667
1668 void dump_heap(void) {
1669         struct igheap *thisheap;
1670
1671         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1672                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1673                         thisheap->file, thisheap->line);
1674         }
1675 }
1676
1677 #endif /*  DEBUG_MEMORY_LEAKS */