citadel/sysdep.c

   1 /*
   2  * Citadel "system dependent" stuff.
   3  * See COPYING for copyright information.
   4  *
   5  * Here's where we (hopefully) have most parts of the Citadel server that
   6  * would need to be altered to run the server in a non-POSIX environment.
   7  *
   8  * If we ever port to a different platform and either have multiple
   9  * variants of this file or simply load it up with #ifdefs.
  10  *
  11  */
  12
  13 #include "sysdep.h"
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <stdio.h>
  17 #include <fcntl.h>
  18 #include <ctype.h>
  19 #include <signal.h>
  20 #include <sys/types.h>
  21 #include <sys/stat.h>
  22 #include <sys/wait.h>
  23 #include <sys/socket.h>
  24 #include <syslog.h>
  25 #include <sys/syslog.h>
  26
  27 #if TIME_WITH_SYS_TIME
  28 # include <sys/time.h>
  29 # include <time.h>
  30 #else
  31 # if HAVE_SYS_TIME_H
  32 #  include <sys/time.h>
  33 # else
  34 #  include <time.h>
  35 # endif
  36 #endif
  37
  38 #include <limits.h>
  39 #include <sys/resource.h>
  40 #include <netinet/in.h>
  41 #include <netinet/tcp.h>
  42 #include <arpa/inet.h>
  43 #include <netdb.h>
  44 #include <sys/un.h>
  45 #include <string.h>
  46 #include <pwd.h>
  47 #include <errno.h>
  48 #include <stdarg.h>
  49 #include <grp.h>
  50 #define SHOW_ME_VAPPEND_PRINTF
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "sysdep_decls.h"
  55 #include "citserver.h"
  56 #include "support.h"
  57 #include "config.h"
  58 #include "database.h"
  59 #include "housekeeping.h"
  60 #include "modules/crypto/serv_crypto.h" /* Needed for init_ssl, client_write_ssl, client_read_ssl, destruct_ssl */
  61 #include "ecrash.h"
  62 #include "context.h"
  63
  64 #ifdef HAVE_SYS_SELECT_H
  65 #include <sys/select.h>
  66 #endif
  67
  68 #ifndef HAVE_SNPRINTF
  69 #include "snprintf.h"
  70 #endif
  71
  72 #include "ctdl_module.h"
  73 #include "threads.h"
  74 #include "user_ops.h"
  75 #include "control.h"
  76
  77
  78 #ifdef DEBUG_MEMORY_LEAKS
  79 struct igheap {
  80         struct igheap *next;
  81         char file[32];
  82         int line;
  83         void *block;
  84 };
  85
  86 struct igheap *igheap = NULL;
  87 #endif
  88
  89
  90 int verbosity = DEFAULT_VERBOSITY;              /* Logging level */
  91
  92 int syslog_facility = LOG_DAEMON;
  93 int enable_syslog = 0;
  94 int print_to_logfile = 1;
  95
  96 /*
  97  * CtdlLogPrintf()  ...   Write logging information
  98  */
  99 void CtdlLogPrintf(enum LogLevel loglevel, const char *format, ...) {
 100         va_list arg_ptr;
 101         va_start(arg_ptr, format);
 102         vCtdlLogPrintf(loglevel, format, arg_ptr);
 103         va_end(arg_ptr);
 104 }
 105
 106 void vCtdlLogPrintf(enum LogLevel loglevel, const char *format, va_list arg_ptr)
 107 {
 108
 109         if (enable_syslog) {
 110                 vsyslog((syslog_facility | loglevel), format, arg_ptr);
 111         }
 112
 113         /* stderr output code */
 114         if (enable_syslog || !print_to_logfile) return;
 115
 116         /* if we run in forground and syslog is disabled, log to terminal */
 117         if (loglevel <= verbosity) {
 118                 struct timeval tv;
 119                 struct tm tim;
 120                 time_t unixtime;
 121                 CitContext *CCC = CC;
 122                 ThreadTSD *cTSD = CTP;
 123                 CtdlThreadNode *node = NULL;
 124                 long lwpid = 0;
 125                 char formatbuf[SIZ];
 126                 char LWP[64];
 127                 char SESS[64];
 128
 129                 if (cTSD != NULL) {
 130                         node = cTSD->self;
 131                 }
 132
 133                 if ((node != NULL) && (node->reltid != 0)) {
 134                         lwpid = node->reltid;
 135                 }
 136
 137                 gettimeofday(&tv, NULL);
 138
 139                 /* Promote to time_t; types differ on some OSes (like darwin) */
 140                 unixtime = tv.tv_sec;
 141                 localtime_r(&unixtime, &tim);
 142
 143                 *LWP = '\0';
 144                 if (lwpid != 0) {
 145                         snprintf(LWP, 64, "[LWP:%ld] ", lwpid);
 146                 }
 147
 148                 *SESS = '\0';
 149                 if (CCC != NULL) {
 150                         if (CCC->cs_pid != 0) {
 151                                 snprintf(SESS, 64, " [%3d] ", CCC->cs_pid);
 152                         }
 153                         else if (CCC->user.usernum != 0) {
 154                                 snprintf(SESS, 64, " [:%ld] ", CCC->user.usernum);
 155                         }
 156                 }
 157
 158                 snprintf(formatbuf, SIZ,
 159                          "%04d/%02d/%02d %2d:%02d:%02d.%06ld %s%s%s",
 160                          tim.tm_year + 1900, tim.tm_mon + 1,
 161                          tim.tm_mday, tim.tm_hour, tim.tm_min,
 162                          tim.tm_sec, (long)tv.tv_usec,
 163                          LWP, SESS, format
 164                 );
 165
 166                 vfprintf(stderr, formatbuf, arg_ptr);
 167                 fflush(stderr);
 168         }
 169 }
 170
 171
 172
 173 /*
 174  * Signal handler to shut down the server.
 175  */
 176
 177 volatile int exit_signal = 0;
 178 volatile int shutdown_and_halt = 0;
 179 volatile int restart_server = 0;
 180 volatile int running_as_daemon = 0;
 181
 182 static RETSIGTYPE signal_cleanup(int signum) {
 183         ThreadTSD *Cc;
 184
 185         Cc = CTP;
 186         if (Cc && Cc->self)
 187                 Cc->self->signal = signum;
 188         else
 189         {
 190                 CtdlLogPrintf(CTDL_DEBUG, "Caught signal %d; shutting down.\n", signum);
 191                 exit_signal = signum;
 192         }
 193 }
 194
 195 static RETSIGTYPE signal_exit(int signum) {
 196         exit(1);
 197 }
 198
 199
 200
 201 /*
 202  * Some initialization stuff...
 203  */
 204 void init_sysdep(void) {
 205         sigset_t set;
 206
 207         /* Avoid vulnerabilities related to FD_SETSIZE if we can. */
 208 #ifdef FD_SETSIZE
 209 #ifdef RLIMIT_NOFILE
 210         struct rlimit rl;
 211         getrlimit(RLIMIT_NOFILE, &rl);
 212         rl.rlim_cur = FD_SETSIZE;
 213         rl.rlim_max = FD_SETSIZE;
 214         setrlimit(RLIMIT_NOFILE, &rl);
 215 #endif
 216 #endif
 217
 218         /* If we've got OpenSSL, we're going to use it. */
 219 #ifdef HAVE_OPENSSL
 220         init_ssl();
 221 #endif
 222
 223         /*
 224          * Set up a place to put thread-specific data.
 225          * We only need a single pointer per thread - it points to the
 226          * CitContext structure (in the ContextList linked list) of the
 227          * session to which the calling thread is currently bound.
 228          */
 229         if (citthread_key_create(&MyConKey, NULL) != 0) {
 230                 CtdlLogPrintf(CTDL_CRIT, "Can't create TSD key: %s\n",
 231                         strerror(errno));
 232         }
 233
 234         /*
 235          * The action for unexpected signals and exceptions should be to
 236          * call signal_cleanup() to gracefully shut down the server.
 237          */
 238         sigemptyset(&set);
 239         sigaddset(&set, SIGINT);                // intr = shutdown
 240         // sigaddset(&set, SIGQUIT);            // quit = force quit
 241         sigaddset(&set, SIGHUP);
 242         sigaddset(&set, SIGTERM);
 243         // sigaddset(&set, SIGSEGV);            // we want core dumps
 244         // sigaddset(&set, SIGILL);             // we want core dumps
 245         // sigaddset(&set, SIGBUS);
 246         sigprocmask(SIG_UNBLOCK, &set, NULL);
 247
 248         signal(SIGINT, signal_cleanup);         // intr = shutdown
 249         // signal(SIGQUIT, signal_cleanup);     // quit = force quit
 250         signal(SIGHUP, signal_cleanup);
 251         signal(SIGTERM, signal_cleanup);
 252         signal(SIGUSR2, signal_exit);
 253         // signal(SIGSEGV, signal_cleanup);     // we want coredumps
 254         // signal(SIGILL, signal_cleanup);      // we want core dumps
 255         // signal(SIGBUS, signal_cleanup);
 256
 257         /*
 258          * Do not shut down the server on broken pipe signals, otherwise the
 259          * whole Citadel service would come down whenever a single client
 260          * socket breaks.
 261          */
 262         signal(SIGPIPE, SIG_IGN);
 263 }
 264
 265
 266 /*
 267  * This is a generic function to set up a master socket for listening on
 268  * a TCP port.  The server shuts down if the bind fails.  (IPv4/IPv6 version)
 269  *
 270  * ip_addr      IP address to bind
 271  * port_number  port number to bind
 272  * queue_len    number of incoming connections to allow in the queue
 273  */
 274 int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len, char *errormessage)
 275 {
 276         struct protoent *p;
 277         struct sockaddr_in6 sin6;
 278         struct sockaddr_in sin4;
 279         int s, i, b;
 280         int ip_version = 6;
 281
 282         memset(&sin6, 0, sizeof(sin6));
 283         memset(&sin4, 0, sizeof(sin4));
 284         sin6.sin6_family = AF_INET6;
 285         sin4.sin_family = AF_INET;
 286
 287         if (    (ip_addr == NULL)                                                       /* any IPv6 */
 288                 || (IsEmptyStr(ip_addr))
 289                 || (!strcmp(ip_addr, "*"))
 290         ) {
 291                 ip_version = 6;
 292                 sin6.sin6_addr = in6addr_any;
 293         }
 294         else if (!strcmp(ip_addr, "0.0.0.0"))                                           /* any IPv4 */
 295         {
 296                 ip_version = 4;
 297                 sin4.sin_addr.s_addr = INADDR_ANY;
 298         }
 299         else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':')))                     /* specific IPv4 */
 300         {
 301                 ip_version = 4;
 302                 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
 303                         snprintf(errormessage, SIZ,
 304                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 305                         );
 306                         CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 307                         return (-1);
 308                 }
 309         }
 310         else                                                                            /* specific IPv6 */
 311         {
 312                 ip_version = 6;
 313                 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
 314                         snprintf(errormessage, SIZ,
 315                                  "Error binding to [%s] : %s", ip_addr, strerror(errno)
 316                         );
 317                         CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 318                         return (-1);
 319                 }
 320         }
 321
 322         if (port_number == 0) {
 323                 snprintf(errormessage, SIZ,
 324                          "Can't start: no port number specified."
 325                 );
 326                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 327                 return (-1);
 328         }
 329         sin6.sin6_port = htons((u_short) port_number);
 330         sin4.sin_port = htons((u_short) port_number);
 331
 332         p = getprotobyname("tcp");
 333
 334         s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
 335         if (s < 0) {
 336                 snprintf(errormessage, SIZ,
 337                          "Can't create a listening socket: %s", strerror(errno)
 338                 );
 339                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 340                 return (-1);
 341         }
 342         /* Set some socket options that make sense. */
 343         i = 1;
 344         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
 345
 346         if (ip_version == 6) {
 347                 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
 348         }
 349         else {
 350                 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
 351         }
 352
 353         if (b < 0) {
 354                 snprintf(errormessage, SIZ,
 355                          "Can't bind: %s", strerror(errno)
 356                 );
 357                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 358                 return (-1);
 359         }
 360
 361         fcntl(s, F_SETFL, O_NONBLOCK);
 362
 363         if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
 364                 snprintf(errormessage, SIZ,
 365                          "Can't listen: %s", strerror(errno)
 366                 );
 367                 CtdlLogPrintf(CTDL_ALERT, "%s\n", errormessage);
 368                 return (-1);
 369         }
 370         return (s);
 371 }
 372
 373
 374
 375
 376
 377 /*
 378  * Create a Unix domain socket and listen on it
 379  */
 380 int ctdl_uds_server(char *sockpath, int queue_len, char *errormessage)
 381 {
 382         struct sockaddr_un addr;
 383         int s;
 384         int i;
 385         int actual_queue_len;
 386 #ifdef HAVE_STRUCT_UCRED
 387         int passcred = 1;
 388 #endif
 389
 390         actual_queue_len = queue_len;
 391         if (actual_queue_len < 5) actual_queue_len = 5;
 392
 393         i = unlink(sockpath);
 394         if ((i != 0) && (errno != ENOENT)) {
 395                 snprintf(errormessage, SIZ, "citserver: can't unlink %s: %s",
 396                         sockpath, strerror(errno)
 397                 );
 398                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 399                 return(-1);
 400         }
 401
 402         memset(&addr, 0, sizeof(addr));
 403         addr.sun_family = AF_UNIX;
 404         safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
 405
 406         s = socket(AF_UNIX, SOCK_STREAM, 0);
 407         if (s < 0) {
 408                 snprintf(errormessage, SIZ,
 409                          "citserver: Can't create a socket: %s",
 410                          strerror(errno));
 411                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 412                 return(-1);
 413         }
 414
 415         if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
 416                 snprintf(errormessage, SIZ,
 417                          "citserver: Can't bind: %s",
 418                          strerror(errno));
 419                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 420                 return(-1);
 421         }
 422
 423         /* set to nonblock - we need this for some obscure situations */
 424         if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
 425                 snprintf(errormessage, SIZ,
 426                          "citserver: Can't set socket to non-blocking: %s",
 427                          strerror(errno));
 428                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 429                 close(s);
 430                 return(-1);
 431         }
 432
 433         if (listen(s, actual_queue_len) < 0) {
 434                 snprintf(errormessage, SIZ,
 435                          "citserver: Can't listen: %s",
 436                          strerror(errno));
 437                 CtdlLogPrintf(CTDL_EMERG, "%s\n", errormessage);
 438                 return(-1);
 439         }
 440
 441 #ifdef HAVE_STRUCT_UCRED
 442         setsockopt(s, SOL_SOCKET, SO_PASSCRED, &passcred, sizeof(passcred));
 443 #endif
 444
 445         chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
 446         return(s);
 447 }
 448
 449
 450
 451 /*
 452  * The following functions implement output buffering on operating systems which
 453  * support it (such as Linux and various BSD flavors).
 454  */
 455 #ifndef HAVE_DARWIN
 456 #ifdef TCP_CORK
 457 #       define HAVE_TCP_BUFFERING
 458 #else
 459 #       ifdef TCP_NOPUSH
 460 #               define HAVE_TCP_BUFFERING
 461 #               define TCP_CORK TCP_NOPUSH
 462 #       endif
 463 #endif /* TCP_CORK */
 464 #endif /* HAVE_DARWIN */
 465
 466 static unsigned on = 1, off = 0;
 467
 468 void buffer_output(void) {
 469 #ifdef HAVE_TCP_BUFFERING
 470 #ifdef HAVE_OPENSSL
 471         if (!CC->redirect_ssl)
 472 #endif
 473                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 474 #endif
 475 }
 476
 477 void unbuffer_output(void) {
 478 #ifdef HAVE_TCP_BUFFERING
 479 #ifdef HAVE_OPENSSL
 480         if (!CC->redirect_ssl)
 481 #endif
 482                 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 483 #endif
 484 }
 485
 486 void flush_output(void) {
 487 #ifdef HAVE_TCP_BUFFERING
 488         struct CitContext *CCC = CC;
 489         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
 490         setsockopt(CCC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
 491 #endif
 492 }
 493
 494 /*
 495 static void flush_client_inbuf(void)
 496 {
 497         CitContext *CCC=CC;
 498
 499         FlushStrBuf(CCC->ReadBuf);
 500         CCC->RecvBuf->ReadWritePointer = NULL;
 501
 502 }
 503 */
 504
 505 /*
 506  * client_write()   ...    Send binary data to the client.
 507  */
 508 int client_write(const char *buf, int nbytes)
 509 {
 510         int bytes_written = 0;
 511         int retval;
 512 #ifndef HAVE_TCP_BUFFERING
 513         int old_buffer_len = 0;
 514 #endif
 515         fd_set wset;
 516         CitContext *Ctx;
 517         int fdflags;
 518
 519         if (nbytes < 1) return(0);
 520
 521         Ctx = CC;
 522
 523 #ifdef BIGBAD_IODBG
 524         {
 525                 int rv = 0;
 526                 char fn [SIZ];
 527                 FILE *fd;
 528
 529                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", Ctx->ServiceName, Ctx->cs_pid);
 530
 531                 fd = fopen(fn, "a+");
 532                 if (fd)
 533                 {
 534                     fprintf(fd, "Sending: BufSize: %d BufContent: [",
 535                             nbytes);
 536                     rv = fwrite(buf, nbytes, 1, fd);
 537                     fprintf(fd, "]\n");
 538                     fclose(fd);
 539                 }
 540         }
 541 #endif
 542 //      flush_client_inbuf();
 543         if (Ctx->redirect_buffer != NULL) {
 544                 StrBufAppendBufPlain(Ctx->redirect_buffer,
 545                                      buf, nbytes, 0);
 546                 return 0;
 547         }
 548
 549 #ifdef HAVE_OPENSSL
 550         if (Ctx->redirect_ssl) {
 551                 client_write_ssl(buf, nbytes);
 552                 return 0;
 553         }
 554 #endif
 555         if (Ctx->client_socket == -1) return -1;
 556
 557         fdflags = fcntl(Ctx->client_socket, F_GETFL);
 558
 559         while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
 560                 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
 561                         FD_ZERO(&wset);
 562                         FD_SET(Ctx->client_socket, &wset);
 563                         if (select(1, NULL, &wset, NULL, NULL) == -1) {
 564                                 if (errno == EINTR)
 565                                 {
 566                                         CtdlLogPrintf(CTDL_DEBUG, "client_write(%d bytes) select() interrupted.\n", nbytes-bytes_written);
 567                                         if (CtdlThreadCheckStop()) {
 568                                                 CC->kill_me = 1;
 569                                                 return (-1);
 570                                         } else {
 571                                                 /* can't trust fd's and stuff so we need to re-create them */
 572                                                 continue;
 573                                         }
 574                                 } else {
 575                                         CtdlLogPrintf(CTDL_ERR,
 576                                                 "client_write(%d bytes) select failed: %s (%d)\n",
 577                                                 nbytes - bytes_written,
 578                                                 strerror(errno), errno);
 579                                         cit_backtrace();
 580                                         Ctx->kill_me = 1;
 581                                         return -1;
 582                                 }
 583                         }
 584                 }
 585
 586                 retval = write(Ctx->client_socket, &buf[bytes_written],
 587                         nbytes - bytes_written);
 588                 if (retval < 1) {
 589                         CtdlLogPrintf(CTDL_ERR,
 590                                 "client_write(%d bytes) failed: %s (%d)\n",
 591                                 nbytes - bytes_written,
 592                                 strerror(errno), errno);
 593                         cit_backtrace();
 594                         // CtdlLogPrintf(CTDL_DEBUG, "Tried to send: %s",  &buf[bytes_written]);
 595                         Ctx->kill_me = 1;
 596                         return -1;
 597                 }
 598                 bytes_written = bytes_written + retval;
 599         }
 600         return 0;
 601 }
 602
 603 void cputbuf(const StrBuf *Buf) {
 604         client_write(ChrPtr(Buf), StrLength(Buf));
 605 }
 606
 607
 608 /*
 609  * cprintf()    Send formatted printable data to the client.
 610  *              Implemented in terms of client_write() so it's technically not sysdep...
 611  */
 612 void cprintf(const char *format, ...) {
 613         va_list arg_ptr;
 614         char buf[1024];
 615
 616         va_start(arg_ptr, format);
 617         if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
 618                 buf[sizeof buf - 2] = '\n';
 619         client_write(buf, strlen(buf));
 620         va_end(arg_ptr);
 621 }
 622
 623
 624 /*
 625  * Read data from the client socket.
 626  *
 627  * sock         socket fd to read from
 628  * buf          buffer to read into
 629  * bytes        number of bytes to read
 630  * timeout      Number of seconds to wait before timing out
 631  *
 632  * Possible return values:
 633  *      1       Requested number of bytes has been read.
 634  *      0       Request timed out.
 635  *      -1      Connection is broken, or other error.
 636  */
 637 int client_read_blob(StrBuf *Target, int bytes, int timeout)
 638 {
 639         CitContext *CCC=CC;
 640         const char *Error;
 641         int retval = 0;
 642
 643 #ifdef HAVE_OPENSSL
 644         if (CCC->redirect_ssl) {
 645 #ifdef BIGBAD_IODBG
 646                 int rv = 0;
 647                 char fn [SIZ];
 648                 FILE *fd;
 649
 650                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 651
 652                 fd = fopen(fn, "a+");
 653                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 654                         bytes);
 655                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 656                 fprintf(fd, "]\n");
 657
 658
 659                 fclose(fd);
 660 #endif
 661                 retval = client_read_sslblob(Target, bytes, timeout);
 662                 if (retval < 0) {
 663                         CtdlLogPrintf(CTDL_CRIT,
 664                                       "%s failed\n",
 665                                       __FUNCTION__);
 666                 }
 667 #ifdef BIGBAD_IODBG
 668                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 669
 670                 fd = fopen(fn, "a+");
 671                 fprintf(fd, "Read: %d BufContent: [",
 672                         StrLength(Target));
 673                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 674                 fprintf(fd, "]\n");
 675
 676
 677                 fclose(fd);
 678 #endif
 679         }
 680         else
 681 #endif
 682         {
 683 #ifdef BIGBAD_IODBG
 684                 int rv = 0;
 685                 char fn [SIZ];
 686                 FILE *fd;
 687
 688                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 689
 690                 fd = fopen(fn, "a+");
 691                 fprintf(fd, "Reading BLOB: BufSize: %d ",
 692                         bytes);
 693                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 694                 fprintf(fd, "]\n");
 695
 696
 697                 fclose(fd);
 698 #endif
 699                 retval = StrBufReadBLOBBuffered(Target,
 700                                                 CCC->RecvBuf.Buf,
 701                                                 &CCC->RecvBuf.ReadWritePointer,
 702                                                 &CCC->client_socket,
 703                                                 1,
 704                                                 bytes,
 705                                                 O_TERM,
 706                                                 &Error);
 707                 if (retval < 0) {
 708                         CtdlLogPrintf(CTDL_CRIT,
 709                                       "%s failed: %s\n",
 710                                       __FUNCTION__,
 711                                       Error);
 712                         return retval;
 713                 }
 714 #ifdef BIGBAD_IODBG
 715                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 716
 717                 fd = fopen(fn, "a+");
 718                 fprintf(fd, "Read: %d BufContent: [",
 719                         StrLength(Target));
 720                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 721                 fprintf(fd, "]\n");
 722
 723
 724                 fclose(fd);
 725 #endif
 726         }
 727         return retval;
 728 }
 729
 730
 731 /*
 732  * to make client_read_random_blob() more efficient, increase buffer size.
 733  * just use in greeting function, else your buffer may be flushed
 734  */
 735 void client_set_inbound_buf(long N)
 736 {
 737         CitContext *CCC=CC;
 738         FlushStrBuf(CCC->RecvBuf.Buf);
 739         ReAdjustEmptyBuf(CCC->RecvBuf.Buf, N * SIZ, N * SIZ);
 740 }
 741
 742 int client_read_random_blob(StrBuf *Target, int timeout)
 743 {
 744         CitContext *CCC=CC;
 745         int rc;
 746
 747         rc =  client_read_blob(Target, 1, timeout);
 748         if (rc > 0)
 749         {
 750                 long len;
 751                 const char *pch;
 752
 753                 len = StrLength(CCC->RecvBuf.Buf);
 754                 pch = ChrPtr(CCC->RecvBuf.Buf);
 755
 756                 if (len > 0)
 757                 {
 758                         if (CCC->RecvBuf.ReadWritePointer != NULL) {
 759                                 len -= CCC->RecvBuf.ReadWritePointer - pch;
 760                                 pch = CCC->RecvBuf.ReadWritePointer;
 761                         }
 762                         StrBufAppendBufPlain(Target, pch, len, 0);
 763                         FlushStrBuf(CCC->RecvBuf.Buf);
 764                         CCC->RecvBuf.ReadWritePointer = NULL;
 765 #ifdef BIGBAD_IODBG
 766                         {
 767                                 int rv = 0;
 768                                 char fn [SIZ];
 769                                 FILE *fd;
 770
 771                                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 772
 773                                 fd = fopen(fn, "a+");
 774                                 fprintf(fd, "Read: BufSize: %d BufContent: [",
 775                                         StrLength(Target));
 776                                 rv = fwrite(ChrPtr(Target), StrLength(Target), 1, fd);
 777                                 fprintf(fd, "]\n");
 778
 779
 780                                 fclose(fd);
 781                         }
 782 #endif
 783
 784                         return StrLength(Target);
 785                 }
 786                 return rc;
 787         }
 788         else
 789                 return rc;
 790 }
 791
 792 int client_read_to(char *buf, int bytes, int timeout)
 793 {
 794         CitContext *CCC=CC;
 795         int rc;
 796
 797         rc = client_read_blob(CCC->MigrateBuf, bytes, timeout);
 798         if (rc < 0)
 799         {
 800                 *buf = '\0';
 801                 return rc;
 802         }
 803         else
 804         {
 805                 memcpy(buf,
 806                        ChrPtr(CCC->MigrateBuf),
 807                        StrLength(CCC->MigrateBuf) + 1);
 808                 FlushStrBuf(CCC->MigrateBuf);
 809                 return rc;
 810         }
 811 }
 812
 813
 814 int HaveMoreLinesWaiting(CitContext *CCC)
 815 {
 816         if ((CCC->kill_me == 1) || (
 817             (CCC->RecvBuf.ReadWritePointer == NULL) &&
 818             (StrLength(CCC->RecvBuf.Buf) == 0) &&
 819             (CCC->client_socket != -1)) )
 820                 return 0;
 821         else
 822                 return 1;
 823 }
 824
 825
 826 /*
 827  * Read data from the client socket with default timeout.
 828  * (This is implemented in terms of client_read_to() and could be
 829  * justifiably moved out of sysdep.c)
 830  */
 831 INLINE int client_read(char *buf, int bytes)
 832 {
 833         return(client_read_to(buf, bytes, config.c_sleeping));
 834 }
 835
 836 int CtdlClientGetLine(StrBuf *Target)
 837 {
 838         CitContext *CCC=CC;
 839         const char *Error;
 840         int rc;
 841
 842         FlushStrBuf(Target);
 843 #ifdef HAVE_OPENSSL
 844         if (CCC->redirect_ssl) {
 845 #ifdef BIGBAD_IODBG
 846                 char fn [SIZ];
 847                 FILE *fd;
 848                 int len = 0;
 849                 int rlen = 0;
 850                 int  nlen = 0;
 851                 int nrlen = 0;
 852                 const char *pch;
 853
 854                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 855
 856                 fd = fopen(fn, "a+");
 857                 pch = ChrPtr(CCC->RecvBuf.Buf);
 858                 len = StrLength(CCC->RecvBuf.Buf);
 859                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 860                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 861                 else
 862                         rlen = 0;
 863
 864 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 865                         len, rlen, pch);
 866 */
 867                 fprintf(fd, "\n\n\nSSL1: BufSize: %d BufPos: %d \n_____________________\n",
 868                         len, rlen);
 869 #endif
 870                 rc = client_readline_sslbuffer(Target,
 871                                                CCC->RecvBuf.Buf,
 872                                                &CCC->RecvBuf.ReadWritePointer,
 873                                                1);
 874 #ifdef BIGBAD_IODBG
 875                 pch = ChrPtr(CCC->RecvBuf.Buf);
 876                 nlen = StrLength(CCC->RecvBuf.Buf);
 877                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 878                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 879                 else
 880                         nrlen = 0;
 881 /*
 882                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 883                         len, nlen, rlen, nrlen, pch);
 884 */
 885                 fprintf(fd, "\n\n\nSSL2: BufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 886                         len, nlen, rlen, nrlen);
 887
 888                 fprintf(fd, "SSL3: Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 889                         StrLength(Target), ChrPtr(Target));
 890                 fclose(fd);
 891
 892                 if (rc < 0)
 893                         CtdlLogPrintf(CTDL_CRIT,
 894                                       "%s failed\n",
 895                                       __FUNCTION__);
 896 #endif
 897                 return rc;
 898         }
 899         else
 900 #endif
 901         {
 902 #ifdef BIGBAD_IODBG
 903                 char fn [SIZ];
 904                 FILE *fd;
 905                 int len, rlen, nlen, nrlen;
 906                 const char *pch;
 907
 908                 snprintf(fn, SIZ, "/tmp/foolog_%s.%d", CCC->ServiceName, CCC->cs_pid);
 909
 910                 fd = fopen(fn, "a+");
 911                 pch = ChrPtr(CCC->RecvBuf.Buf);
 912                 len = StrLength(CCC->RecvBuf.Buf);
 913                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 914                         rlen = CCC->RecvBuf.ReadWritePointer - pch;
 915                 else
 916                         rlen = 0;
 917
 918 /*              fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \nBufContent: [%s]\n\n_____________________\n",
 919                         len, rlen, pch);
 920 */
 921                 fprintf(fd, "\n\n\nBufSize: %d BufPos: %d \n_____________________\n",
 922                         len, rlen);
 923 #endif
 924                 rc = StrBufTCP_read_buffered_line_fast(Target,
 925                                                        CCC->RecvBuf.Buf,
 926                                                        &CCC->RecvBuf.ReadWritePointer,
 927                                                        &CCC->client_socket,
 928                                                        5,
 929                                                        1,
 930                                                        &Error);
 931
 932 #ifdef BIGBAD_IODBG
 933                 pch = ChrPtr(CCC->RecvBuf.Buf);
 934                 nlen = StrLength(CCC->RecvBuf.Buf);
 935                 if (CCC->RecvBuf.ReadWritePointer != NULL)
 936                         nrlen = CCC->RecvBuf.ReadWritePointer - pch;
 937                 else
 938                         nrlen = 0;
 939 /*
 940                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \nBufContent: [%s]\n\n_____________________\n",
 941                         len, nlen, rlen, nrlen, pch);
 942 */
 943                 fprintf(fd, "\n\n\nBufSize: was: %d is: %d BufPos: was: %d is: %d \n",
 944                         len, nlen, rlen, nrlen);
 945
 946                 fprintf(fd, "Read: BufSize: %d BufContent: [%s]\n\n*************\n",
 947                         StrLength(Target), ChrPtr(Target));
 948                 fclose(fd);
 949
 950                 if ((rc < 0) && (Error != NULL))
 951                         CtdlLogPrintf(CTDL_CRIT,
 952                                       "%s failed: %s\n",
 953                                       __FUNCTION__,
 954                                       Error);
 955 #endif
 956                 return rc;
 957         }
 958 }
 959
 960
 961 /*
 962  * client_getln()   ...   Get a LF-terminated line of text from the client.
 963  * (This is implemented in terms of client_read() and could be
 964  * justifiably moved out of sysdep.c)
 965  */
 966 int client_getln(char *buf, int bufsize)
 967 {
 968         int i, retval;
 969         CitContext *CCC=CC;
 970         const char *pCh;
 971
 972         retval = CtdlClientGetLine(CCC->MigrateBuf);
 973         if (retval < 0)
 974           return(retval >= 0);
 975
 976
 977         i = StrLength(CCC->MigrateBuf);
 978         pCh = ChrPtr(CCC->MigrateBuf);
 979         /* Strip the trailing LF, and the trailing CR if present.
 980          */
 981         if (bufsize <= i)
 982                 i = bufsize - 1;
 983         while ( (i > 0)
 984                 && ( (pCh[i - 1]==13)
 985                      || ( pCh[i - 1]==10)) ) {
 986                 i--;
 987         }
 988         memcpy(buf, pCh, i);
 989         buf[i] = 0;
 990
 991         FlushStrBuf(CCC->MigrateBuf);
 992         if (retval < 0) {
 993                 safestrncpy(&buf[i], "000", bufsize - i);
 994         }
 995         return(retval >= 0);
 996 }
 997
 998
 999 /*
1000  * Cleanup any contexts that are left lying around
1001  */
1002
1003
1004 void close_masters (void)
1005 {
1006         struct ServiceFunctionHook *serviceptr;
1007
1008         /*
1009          * close all protocol master sockets
1010          */
1011         for (serviceptr = ServiceHookTable; serviceptr != NULL;
1012             serviceptr = serviceptr->next ) {
1013
1014                 if (serviceptr->tcp_port > 0)
1015                 {
1016                         CtdlLogPrintf(CTDL_INFO, "Closing listener on port %d\n",
1017                                 serviceptr->tcp_port);
1018                         serviceptr->tcp_port = 0;
1019                 }
1020
1021                 if (serviceptr->sockpath != NULL)
1022                         CtdlLogPrintf(CTDL_INFO, "Closing listener on '%s'\n",
1023                                 serviceptr->sockpath);
1024
1025                 close(serviceptr->msock);
1026                 /* If it's a Unix domain socket, remove the file. */
1027                 if (serviceptr->sockpath != NULL) {
1028                         unlink(serviceptr->sockpath);
1029                         serviceptr->sockpath = NULL;
1030                 }
1031         }
1032 }
1033
1034
1035 /*
1036  * The system-dependent part of master_cleanup() - close the master socket.
1037  */
1038 void sysdep_master_cleanup(void) {
1039
1040         close_masters();
1041
1042         context_cleanup();
1043
1044 #ifdef HAVE_OPENSSL
1045         destruct_ssl();
1046 #endif
1047         CtdlDestroyProtoHooks();
1048         CtdlDestroyDeleteHooks();
1049         CtdlDestroyXmsgHooks();
1050         CtdlDestroyNetprocHooks();
1051         CtdlDestroyUserHooks();
1052         CtdlDestroyMessageHook();
1053         CtdlDestroyCleanupHooks();
1054         CtdlDestroyFixedOutputHooks();
1055         CtdlDestroySessionHooks();
1056         CtdlDestroyServiceHook();
1057         CtdlDestroyRoomHooks();
1058         CtdlDestroySearchHooks();
1059         #ifdef HAVE_BACKTRACE
1060 ///     eCrash_Uninit();
1061         #endif
1062 }
1063
1064
1065
1066 pid_t current_child;
1067 void graceful_shutdown(int signum) {
1068         kill(current_child, signum);
1069         unlink(file_pid_file);
1070         exit(0);
1071 }
1072
1073 int nFireUps = 0;
1074 int nFireUpsNonRestart = 0;
1075 pid_t ForkedPid = 1;
1076
1077 /*
1078  * Start running as a daemon.
1079  */
1080 void start_daemon(int unused) {
1081         int status = 0;
1082         pid_t child = 0;
1083         FILE *fp;
1084         int do_restart = 0;
1085
1086         current_child = 0;
1087
1088         /* Close stdin/stdout/stderr and replace them with /dev/null.
1089          * We don't just call close() because we don't want these fd's
1090          * to be reused for other files.
1091          */
1092         if (chdir(ctdl_run_dir) != 0)
1093                 CtdlLogPrintf(CTDL_EMERG,
1094                               "unable to change into directory [%s]: %s",
1095                               ctdl_run_dir, strerror(errno));
1096
1097         child = fork();
1098         if (child != 0) {
1099                 exit(0);
1100         }
1101
1102         signal(SIGHUP, SIG_IGN);
1103         signal(SIGINT, SIG_IGN);
1104         signal(SIGQUIT, SIG_IGN);
1105
1106         setsid();
1107         umask(0);
1108         if ((freopen("/dev/null", "r", stdin) != stdin) ||
1109             (freopen("/dev/null", "w", stdout) != stdout) ||
1110             (freopen("/dev/null", "w", stderr) != stderr))
1111                 CtdlLogPrintf(CTDL_EMERG,
1112                               "unable to reopen stdin/out/err %s",
1113                               strerror(errno));
1114
1115
1116         do {
1117                 current_child = fork();
1118
1119                 signal(SIGTERM, graceful_shutdown);
1120
1121                 if (current_child < 0) {
1122                         perror("fork");
1123                         exit(errno);
1124                 }
1125
1126                 else if (current_child == 0) {
1127                         return; /* continue starting citadel. */
1128                 }
1129
1130                 else {
1131                         fp = fopen(file_pid_file, "w");
1132                         if (fp != NULL) {
1133                                 fprintf(fp, ""F_PID_T"\n", getpid());
1134                                 fclose(fp);
1135                         }
1136                         waitpid(current_child, &status, 0);
1137                 }
1138                 do_restart = 0;
1139                 nFireUpsNonRestart = nFireUps;
1140
1141                 /* Exit code 0 means the watcher should exit */
1142                 if (WIFEXITED(status) && (WEXITSTATUS(status) == CTDLEXIT_SHUTDOWN)) {
1143                         do_restart = 0;
1144                 }
1145
1146                 /* Exit code 101-109 means the watcher should exit */
1147                 else if (WIFEXITED(status) && (WEXITSTATUS(status) >= 101) && (WEXITSTATUS(status) <= 109)) {
1148                         do_restart = 0;
1149                 }
1150
1151                 /* Any other exit code, or no exit code, means we should restart. */
1152                 else {
1153                         do_restart = 1;
1154                         nFireUps++;
1155                         ForkedPid = current_child;
1156                 }
1157
1158         } while (do_restart);
1159
1160         unlink(file_pid_file);
1161         exit(WEXITSTATUS(status));
1162 }
1163
1164
1165
1166 void checkcrash(void)
1167 {
1168         if (nFireUpsNonRestart != nFireUps)
1169         {
1170                 StrBuf *CrashMail;
1171
1172                 CrashMail = NewStrBuf();
1173                 CtdlLogPrintf(CTDL_ALERT, "Posting crash message\n");
1174                 StrBufPrintf(CrashMail,
1175                         " \n"
1176                         " The Citadel server process (citserver) terminated unexpectedly."
1177                         "\n \n"
1178                         " This could be the result of a bug in the server program, or some external "
1179                         "factor.\n \n"
1180                         " You can obtain more information about this by enabling core dumps.\n \n"
1181                         " For more information, please see:\n \n"
1182                         " http://citadel.org/doku.php/faq:mastering_your_os:gdb#how.do.i.make.my.system.produce.core-files"
1183                         "\n \n"
1184
1185                         " If you have already done this, the core dump is likely to be found at %score.%d\n"
1186                         ,
1187                         ctdl_run_dir, ForkedPid);
1188                 CtdlAideMessage(ChrPtr(CrashMail), "Citadel server process terminated unexpectedly");
1189                 FreeStrBuf(&CrashMail);
1190         }
1191 }
1192
1193
1194 /*
1195  * Generic routine to convert a login name to a full name (gecos)
1196  * Returns nonzero if a conversion took place
1197  */
1198 int convert_login(char NameToConvert[]) {
1199         struct passwd *pw;
1200         int a;
1201
1202         pw = getpwnam(NameToConvert);
1203         if (pw == NULL) {
1204                 return(0);
1205         }
1206         else {
1207                 strcpy(NameToConvert, pw->pw_gecos);
1208                 for (a=0; a<strlen(NameToConvert); ++a) {
1209                         if (NameToConvert[a] == ',') NameToConvert[a] = 0;
1210                 }
1211                 return(1);
1212         }
1213 }
1214
1215
1216
1217 /*
1218  * This loop just keeps going and going and going...
1219  */
1220 /*
1221  * FIXME:
1222  * This current implimentation of worker_thread creates a bottle neck in several situations
1223  * The first thing to remember is that a single thread can handle more than one connection at a time.
1224  * More threads mean less memory for the system to run in.
1225  * So for efficiency we want every thread to be doing something useful or waiting in the main loop for
1226  * something to happen anywhere.
1227  * This current implimentation requires worker threads to wait in other locations, after it has
1228  * been committed to a single connection which is very wasteful.
1229  * As an extreme case consider this:
1230  * A slow client connects and this slow client sends only one character each second.
1231  * With this current implimentation a single worker thread is dispatched to handle that connection
1232  * until such times as the client timeout expires, an error occurs on the socket or the client
1233  * completes its transmission.
1234  * THIS IS VERY BAD since that thread could have handled a read from many more clients in each one
1235  * second interval between chars.
1236  *
1237  * It is my intention to re-write this code and the associated client_getln, client_read functions
1238  * to allow any thread to read data on behalf of any connection (context).
1239  * To do this I intend to have this main loop read chars into a buffer stored in the context.
1240  * Once the correct criteria for a full buffer is met then we will dispatch a thread to
1241  * process it.
1242  * This worker thread loop also needs to be able to handle binary data.
1243  */
1244
1245 void *worker_thread(void *arg) {
1246         int highest;
1247         CitContext *ptr;
1248         CitContext *bind_me = NULL;
1249         fd_set readfds;
1250         int retval = 0;
1251         struct timeval tv;
1252         int force_purge = 0;
1253
1254
1255         while (!CtdlThreadCheckStop()) {
1256
1257                 /* make doubly sure we're not holding any stale db handles
1258                  * which might cause a deadlock.
1259                  */
1260                 cdb_check_handles();
1261 do_select:      force_purge = 0;
1262                 bind_me = NULL;         /* Which session shall we handle? */
1263
1264                 /* Initialize the fdset. */
1265                 FD_ZERO(&readfds);
1266                 highest = 0;
1267
1268                 begin_critical_section(S_SESSION_TABLE);
1269                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1270                         int client_socket;
1271                         if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
1272                             continue;
1273                         client_socket = ptr->client_socket;
1274                         /* Dont select on dead sessions only truly idle ones */
1275                         if ((ptr->state == CON_IDLE) &&
1276                             (CC->kill_me == 0) &&
1277                             (client_socket > 0))
1278                         {
1279                                 FD_SET(client_socket, &readfds);
1280                                 if (client_socket > highest)
1281                                         highest = client_socket;
1282                         }
1283                         if ((bind_me == NULL) && (ptr->state == CON_READY)) {
1284                                 bind_me = ptr;
1285                                 ptr->state = CON_EXECUTING;
1286                                 break;
1287                         }
1288                         if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
1289                                 bind_me = ptr;
1290                                 ptr->state = CON_STARTING;
1291                                 break;
1292                         }
1293                 }
1294                 end_critical_section(S_SESSION_TABLE);
1295
1296                 if (bind_me) {
1297                         goto SKIP_SELECT;
1298                 }
1299
1300                 /* If we got this far, it means that there are no sessions
1301                  * which a previous thread marked for attention, so we go
1302                  * ahead and get ready to select().
1303                  */
1304
1305                 if (!CtdlThreadCheckStop()) {
1306                         tv.tv_sec = 1;          /* wake up every second if no input */
1307                         tv.tv_usec = 0;
1308                         retval = CtdlThreadSelect(highest + 1, &readfds, NULL, NULL, &tv);
1309                 }
1310                 else
1311                         return NULL;
1312
1313                 /* Now figure out who made this select() unblock.
1314                  * First, check for an error or exit condition.
1315                  */
1316                 if (retval < 0) {
1317                         if (errno == EBADF) {
1318                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1319                                         strerror(errno));
1320                                 goto do_select;
1321                         }
1322                         if (errno != EINTR) {
1323                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1324                                 CtdlThreadStopAll();
1325                                 continue;
1326                         } else {
1327 #if 0
1328                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1329 #endif
1330                                 if (CtdlThreadCheckStop()) return(NULL);
1331                                 goto do_select;
1332                         }
1333                 }
1334                 else if(retval == 0) {
1335                         if (CtdlThreadCheckStop()) return(NULL);
1336                 }
1337
1338                 /* It must be a client socket.  Find a context that has data
1339                  * waiting on its socket *and* is in the CON_IDLE state.  Any
1340                  * active sockets other than our chosen one are marked as
1341                  * CON_READY so the next thread that comes around can just bind
1342                  * to one without having to select() again.
1343                  */
1344                 begin_critical_section(S_SESSION_TABLE);
1345                 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1346                         int checkfd = ptr->client_socket;
1347                         if ((checkfd != -1) && (ptr->state == CON_IDLE) ){
1348                                 if (FD_ISSET(checkfd, &readfds)) {
1349                                         ptr->input_waiting = 1;
1350                                         if (!bind_me) {
1351                                                 bind_me = ptr;  /* I choose you! */
1352                                                 bind_me->state = CON_EXECUTING;
1353                                         }
1354                                         else {
1355                                                 ptr->state = CON_READY;
1356                                         }
1357                                 } else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
1358                                         if (!bind_me) {
1359                                                 bind_me = ptr;  /* I choose you! */
1360                                                 bind_me->state = CON_EXECUTING;
1361                                         }
1362                                         else {
1363                                                 ptr->state = CON_READY;
1364                                         }
1365                                 }
1366                         }
1367                 }
1368                 end_critical_section(S_SESSION_TABLE);
1369
1370 SKIP_SELECT:
1371                 /* We're bound to a session */
1372                 if (bind_me != NULL) {
1373                         become_session(bind_me);
1374
1375                         if (bind_me->state == CON_STARTING) {
1376                                 bind_me->state = CON_EXECUTING;
1377                                 begin_session(bind_me);
1378                                 bind_me->h_greeting_function();
1379                         }
1380                         /* If the client has sent a command, execute it. */
1381                         if (CC->input_waiting) {
1382                                 CC->h_command_function();
1383
1384                                 while (HaveMoreLinesWaiting(CC))
1385                                        CC->h_command_function();
1386
1387                                 CC->input_waiting = 0;
1388                         }
1389
1390                         /* If there are asynchronous messages waiting and the
1391                          * client supports it, do those now */
1392                         if ((CC->is_async) && (CC->async_waiting)
1393                            && (CC->h_async_function != NULL)) {
1394                                 CC->h_async_function();
1395                                 CC->async_waiting = 0;
1396                         }
1397
1398                         force_purge = CC->kill_me;
1399                         become_session(NULL);
1400                         bind_me->state = CON_IDLE;
1401                 }
1402
1403                 dead_session_purge(force_purge);
1404                 do_housekeeping();
1405         }
1406         /* If control reaches this point, the server is shutting down */
1407         return(NULL);
1408 }
1409
1410
1411
1412
1413 /*
1414  * A function to handle selecting on master sockets.
1415  * In other words it handles new connections.
1416  * It is a thread.
1417  */
1418 void *select_on_master (void *arg)
1419 {
1420         struct ServiceFunctionHook *serviceptr;
1421         fd_set master_fds;
1422         int highest;
1423         struct timeval tv;
1424         int ssock;                      /* Descriptor for client socket */
1425         CitContext *con= NULL;  /* Temporary context pointer */
1426         int m;
1427         int i;
1428         int retval;
1429         struct CitContext select_on_master_CC;
1430
1431         CtdlFillSystemContext(&select_on_master_CC, "select_on_master");
1432         citthread_setspecific(MyConKey, (void *)&select_on_master_CC);
1433
1434         while (!CtdlThreadCheckStop()) {
1435                 /* Initialize the fdset. */
1436                 FD_ZERO(&master_fds);
1437                 highest = 0;
1438
1439                 /* First, add the various master sockets to the fdset. */
1440                 for (serviceptr = ServiceHookTable; serviceptr != NULL;
1441                 serviceptr = serviceptr->next ) {
1442                         m = serviceptr->msock;
1443                         FD_SET(m, &master_fds);
1444                         if (m > highest) {
1445                                 highest = m;
1446                         }
1447                 }
1448
1449                 if (!CtdlThreadCheckStop()) {
1450                         tv.tv_sec = 60;         /* wake up every second if no input */
1451                         tv.tv_usec = 0;
1452                         retval = CtdlThreadSelect(highest + 1, &master_fds, NULL, NULL, &tv);
1453                 }
1454                 else
1455                         return NULL;
1456
1457                 /* Now figure out who made this select() unblock.
1458                  * First, check for an error or exit condition.
1459                  */
1460                 if (retval < 0) {
1461                         if (errno == EBADF) {
1462                                 CtdlLogPrintf(CTDL_NOTICE, "select() failed: (%s)\n",
1463                                         strerror(errno));
1464                                 continue;
1465                         }
1466                         if (errno != EINTR) {
1467                                 CtdlLogPrintf(CTDL_EMERG, "Exiting (%s)\n", strerror(errno));
1468                                 CtdlThreadStopAll();
1469                         } else {
1470 #if 0
1471                                 CtdlLogPrintf(CTDL_DEBUG, "Interrupted CtdlThreadSelect.\n");
1472 #endif
1473                                 if (CtdlThreadCheckStop()) return(NULL);
1474                                 continue;
1475                         }
1476                 }
1477                 else if(retval == 0) {
1478                         if (CtdlThreadCheckStop()) return(NULL);
1479                         continue;
1480                 }
1481                 /* Next, check to see if it's a new client connecting
1482                  * on a master socket.
1483                  */
1484                 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1485                      serviceptr = serviceptr->next ) {
1486
1487                         if (FD_ISSET(serviceptr->msock, &master_fds)) {
1488                                 ssock = accept(serviceptr->msock, NULL, 0);
1489                                 if (ssock >= 0) {
1490                                         CtdlLogPrintf(CTDL_DEBUG,
1491                                                 "New client socket %d\n",
1492                                                 ssock);
1493
1494                                         /* The master socket is non-blocking but the client
1495                                          * sockets need to be blocking, otherwise certain
1496                                          * operations barf on FreeBSD.  Not a fatal error.
1497                                          */
1498                                         if (fcntl(ssock, F_SETFL, 0) < 0) {
1499                                                 CtdlLogPrintf(CTDL_EMERG,
1500                                                         "citserver: Can't set socket to blocking: %s\n",
1501                                                         strerror(errno));
1502                                         }
1503
1504                                         /* New context will be created already
1505                                          * set up in the CON_EXECUTING state.
1506                                          */
1507                                         con = CreateNewContext();
1508
1509                                         /* Assign our new socket number to it. */
1510                                         con->client_socket = ssock;
1511                                         con->h_command_function =
1512                                                 serviceptr->h_command_function;
1513                                         con->h_async_function =
1514                                                 serviceptr->h_async_function;
1515                                         con->h_greeting_function = serviceptr->h_greeting_function;
1516                                         con->ServiceName =
1517                                                 serviceptr->ServiceName;
1518
1519                                         /* Determine whether it's a local socket */
1520                                         if (serviceptr->sockpath != NULL)
1521                                                 con->is_local_socket = 1;
1522
1523                                         /* Set the SO_REUSEADDR socket option */
1524                                         i = 1;
1525                                         setsockopt(ssock, SOL_SOCKET,
1526                                                 SO_REUSEADDR,
1527                                                 &i, sizeof(i));
1528
1529                                         con->state = CON_GREETING;
1530
1531                                         retval--;
1532                                         if (retval == 0)
1533                                                 break;
1534                                 }
1535                         }
1536                 }
1537         }
1538         CtdlClearSystemContext();
1539
1540         return NULL;
1541 }
1542
1543
1544
1545 /*
1546  * SyslogFacility()
1547  * Translate text facility name to syslog.h defined value.
1548  */
1549 int SyslogFacility(char *name)
1550 {
1551         int i;
1552         struct
1553         {
1554                 int facility;
1555                 char *name;
1556         }   facTbl[] =
1557         {
1558                 {   LOG_KERN,   "kern"          },
1559                 {   LOG_USER,   "user"          },
1560                 {   LOG_MAIL,   "mail"          },
1561                 {   LOG_DAEMON, "daemon"        },
1562                 {   LOG_AUTH,   "auth"          },
1563                 {   LOG_SYSLOG, "syslog"        },
1564                 {   LOG_LPR,    "lpr"           },
1565                 {   LOG_NEWS,   "news"          },
1566                 {   LOG_UUCP,   "uucp"          },
1567                 {   LOG_LOCAL0, "local0"        },
1568                 {   LOG_LOCAL1, "local1"        },
1569                 {   LOG_LOCAL2, "local2"        },
1570                 {   LOG_LOCAL3, "local3"        },
1571                 {   LOG_LOCAL4, "local4"        },
1572                 {   LOG_LOCAL5, "local5"        },
1573                 {   LOG_LOCAL6, "local6"        },
1574                 {   LOG_LOCAL7, "local7"        },
1575                 {   0,            NULL          }
1576         };
1577         for(i = 0; facTbl[i].name != NULL; i++) {
1578                 if(!strcasecmp(name, facTbl[i].name))
1579                         return facTbl[i].facility;
1580         }
1581         enable_syslog = 0;
1582         return LOG_DAEMON;
1583 }
1584
1585
1586 /********** MEM CHEQQER ***********/
1587
1588 #ifdef DEBUG_MEMORY_LEAKS
1589
1590 #undef malloc
1591 #undef realloc
1592 #undef strdup
1593 #undef free
1594
1595 void *tracked_malloc(size_t size, char *file, int line) {
1596         struct igheap *thisheap;
1597         void *block;
1598
1599         block = malloc(size);
1600         if (block == NULL) return(block);
1601
1602         thisheap = malloc(sizeof(struct igheap));
1603         if (thisheap == NULL) {
1604                 free(block);
1605                 return(NULL);
1606         }
1607
1608         thisheap->block = block;
1609         strcpy(thisheap->file, file);
1610         thisheap->line = line;
1611
1612         begin_critical_section(S_DEBUGMEMLEAKS);
1613         thisheap->next = igheap;
1614         igheap = thisheap;
1615         end_critical_section(S_DEBUGMEMLEAKS);
1616
1617         return(block);
1618 }
1619
1620
1621 void *tracked_realloc(void *ptr, size_t size, char *file, int line) {
1622         struct igheap *thisheap;
1623         void *block;
1624
1625         block = realloc(ptr, size);
1626         if (block == NULL) return(block);
1627
1628         thisheap = malloc(sizeof(struct igheap));
1629         if (thisheap == NULL) {
1630                 free(block);
1631                 return(NULL);
1632         }
1633
1634         thisheap->block = block;
1635         strcpy(thisheap->file, file);
1636         thisheap->line = line;
1637
1638         begin_critical_section(S_DEBUGMEMLEAKS);
1639         thisheap->next = igheap;
1640         igheap = thisheap;
1641         end_critical_section(S_DEBUGMEMLEAKS);
1642
1643         return(block);
1644 }
1645
1646
1647
1648 void tracked_free(void *ptr) {
1649         struct igheap *thisheap;
1650         struct igheap *trash;
1651
1652         free(ptr);
1653
1654         if (igheap == NULL) return;
1655         begin_critical_section(S_DEBUGMEMLEAKS);
1656         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1657                 if (thisheap->next != NULL) {
1658                         if (thisheap->next->block == ptr) {
1659                                 trash = thisheap->next;
1660                                 thisheap->next = thisheap->next->next;
1661                                 free(trash);
1662                         }
1663                 }
1664         }
1665         if (igheap->block == ptr) {
1666                 trash = igheap;
1667                 igheap = igheap->next;
1668                 free(trash);
1669         }
1670         end_critical_section(S_DEBUGMEMLEAKS);
1671 }
1672
1673 char *tracked_strdup(const char *s, char *file, int line) {
1674         char *ptr;
1675
1676         if (s == NULL) return(NULL);
1677         ptr = tracked_malloc(strlen(s) + 1, file, line);
1678         if (ptr == NULL) return(NULL);
1679         strncpy(ptr, s, strlen(s));
1680         return(ptr);
1681 }
1682
1683 void dump_heap(void) {
1684         struct igheap *thisheap;
1685
1686         for (thisheap = igheap; thisheap != NULL; thisheap = thisheap->next) {
1687                 CtdlLogPrintf(CTDL_CRIT, "UNFREED: %30s : %d\n",
1688                         thisheap->file, thisheap->line);
1689         }
1690 }
1691
1692 #endif /*  DEBUG_MEMORY_LEAKS */