2 * Citadel/UX "system dependent" stuff.
3 * See copyright.txt for copyright information.
7 * Here's where we (hopefully) have all the parts of the Citadel server that
8 * would need to be altered to run the server in a non-POSIX environment.
10 * Eventually we'll try porting to a different platform and either have
11 * multiple variants of this file or simply load it up with #ifdefs.
22 #include <sys/types.h>
25 #include <sys/socket.h>
28 #include <netinet/in.h>
45 #include "sysdep_decls.h"
46 #include "citserver.h"
50 #include "housekeeping.h"
51 #include "dynloader.h"
54 #ifdef HAVE_SYS_SELECT_H
55 #include <sys/select.h>
62 #ifdef DEBUG_MEMORY_LEAKS
63 struct TheHeap *heap = NULL;
66 pthread_mutex_t Critters[MAX_SEMAPHORES]; /* Things needing locking */
67 pthread_key_t MyConKey; /* TSD key for MyContext() */
69 int verbosity = DEFAULT_VERBOSITY; /* Logging level */
71 struct CitContext masterCC;
72 int rescan[2]; /* The Rescan Pipe */
73 time_t last_purge = 0; /* Last dead session purge */
74 int num_threads = 0; /* Current number of threads */
75 int num_sessions = 0; /* Current number of sessions */
77 fd_set masterfds; /* Master sockets etc. */
80 time_t last_timer = 0L; /* Last timer hook processing */
84 * lprintf() ... Write logging information
86 void lprintf(int loglevel, const char *format, ...) {
90 va_start(arg_ptr, format);
91 vsprintf(buf, format, arg_ptr);
94 if (loglevel <= verbosity) {
95 fprintf(stderr, "%s", buf);
99 PerformLogHooks(loglevel, buf);
104 #ifdef DEBUG_MEMORY_LEAKS
105 void *tracked_malloc(size_t tsize, char *tfile, int tline) {
107 struct TheHeap *hptr;
111 lprintf(3, "DANGER! mallok(%d) at %s:%d failed!\n",
112 tsize, tfile, tline);
116 hptr = (struct TheHeap *) malloc(sizeof(struct TheHeap));
117 strcpy(hptr->h_file, tfile);
118 hptr->h_line = tline;
125 char *tracked_strdup(const char *orig, char *tfile, int tline) {
128 s = tracked_malloc( (strlen(orig)+1), tfile, tline);
129 if (s == NULL) return NULL;
135 void tracked_free(void *ptr) {
136 struct TheHeap *hptr, *freeme;
138 if (heap->h_ptr == ptr) {
144 for (hptr=heap; hptr->next!=NULL; hptr=hptr->next) {
145 if (hptr->next->h_ptr == ptr) {
147 hptr->next = hptr->next->next;
156 void *tracked_realloc(void *ptr, size_t size) {
158 struct TheHeap *hptr;
160 newptr = realloc(ptr, size);
162 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
163 if (hptr->h_ptr == ptr) hptr->h_ptr = newptr;
170 void dump_tracked() {
171 struct TheHeap *hptr;
173 cprintf("%d Here's what's allocated...\n", LISTING_FOLLOWS);
174 for (hptr=heap; hptr!=NULL; hptr=hptr->next) {
175 cprintf("%20s %5d\n",
176 hptr->h_file, hptr->h_line);
188 * we used to use master_cleanup() as a signal handler to shut down the server.
189 * however, master_cleanup() and the functions it calls do some things that
190 * aren't such a good idea to do from a signal handler: acquiring mutexes,
191 * playing with signal masks on BSDI systems, etc. so instead we install the
192 * following signal handler to set a global variable to inform the main loop
193 * that it's time to call master_cleanup() and exit.
196 static volatile int time_to_die = 0;
198 static RETSIGTYPE signal_cleanup(int signum) {
204 * Some initialization stuff...
206 void init_sysdep(void) {
209 /* Set up a bunch of semaphores to be used for critical sections */
210 for (a=0; a<MAX_SEMAPHORES; ++a) {
211 pthread_mutex_init(&Critters[a], NULL);
215 * Set up a place to put thread-specific data.
216 * We only need a single pointer per thread - it points to the
217 * thread's CitContext structure in the ContextList linked list.
219 if (pthread_key_create(&MyConKey, NULL) != 0) {
220 lprintf(1, "Can't create TSD key!! %s\n", strerror(errno));
224 * The action for unexpected signals and exceptions should be to
225 * call signal_cleanup() to gracefully shut down the server.
227 signal(SIGINT, signal_cleanup);
228 signal(SIGQUIT, signal_cleanup);
229 signal(SIGHUP, signal_cleanup);
230 signal(SIGTERM, signal_cleanup);
233 * Do not shut down the server on broken pipe signals, otherwise the
234 * whole Citadel service would come down whenever a single client
237 signal(SIGPIPE, SIG_IGN);
242 * Obtain a semaphore lock to begin a critical section.
244 void begin_critical_section(int which_one)
246 /* lprintf(9, "begin_critical_section(%d)\n", which_one); */
247 pthread_mutex_lock(&Critters[which_one]);
251 * Release a semaphore lock to end a critical section.
253 void end_critical_section(int which_one)
255 /* lprintf(9, "end_critical_section(%d)\n", which_one); */
256 pthread_mutex_unlock(&Critters[which_one]);
262 * This is a generic function to set up a master socket for listening on
263 * a TCP port. The server shuts down if the bind fails.
266 int ig_tcp_server(int port_number, int queue_len)
268 struct sockaddr_in sin;
271 memset(&sin, 0, sizeof(sin));
272 sin.sin_family = AF_INET;
273 sin.sin_addr.s_addr = INADDR_ANY;
274 sin.sin_port = htons((u_short)port_number);
276 s = socket(PF_INET, SOCK_STREAM,
277 (getprotobyname("tcp")->p_proto));
280 lprintf(1, "citserver: Can't create a socket: %s\n",
286 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
288 if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
289 lprintf(1, "citserver: Can't bind: %s\n",
294 if (listen(s, queue_len) < 0) {
295 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
305 * Create a Unix domain socket and listen on it
307 int ig_uds_server(char *sockpath, int queue_len)
309 struct sockaddr_un addr;
314 memset(&addr, 0, sizeof(addr));
315 addr.sun_family = AF_UNIX;
316 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
318 s = socket(AF_UNIX, SOCK_STREAM, 0);
320 lprintf(1, "citserver: Can't create a socket: %s\n",
325 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
326 lprintf(1, "citserver: Can't bind: %s\n",
331 if (listen(s, queue_len) < 0) {
332 lprintf(1, "citserver: Can't listen: %s\n", strerror(errno));
336 chmod(sockpath, 0777);
343 * Return a pointer to the CitContext structure bound to the thread which
344 * called this function. If there's no such binding (for example, if it's
345 * called by the housekeeper thread) then a generic 'master' CC is returned.
347 struct CitContext *MyContext(void) {
348 struct CitContext *retCC;
349 retCC = (struct CitContext *) pthread_getspecific(MyConKey);
350 if (retCC == NULL) retCC = &masterCC;
356 * Initialize a new context and place it in the list.
358 struct CitContext *CreateNewContext(void) {
359 struct CitContext *me, *ptr;
363 me = (struct CitContext *) mallok(sizeof(struct CitContext));
365 lprintf(1, "citserver: can't allocate memory!!\n");
368 memset(me, 0, sizeof(struct CitContext));
370 /* The new context will be created already in the CON_EXECUTING state
371 * in order to prevent another thread from grabbing it while it's
374 me->state = CON_EXECUTING;
376 begin_critical_section(S_SESSION_TABLE);
378 /* obtain a unique session number */
381 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
382 if (ptr->cs_pid == num) {
387 } while (startover == 1);
390 me->next = ContextList;
394 end_critical_section(S_SESSION_TABLE);
401 * client_write() ... Send binary data to the client.
403 void client_write(char *buf, int nbytes)
405 int bytes_written = 0;
409 if (CC->redirect_fp != NULL) {
410 fwrite(buf, nbytes, 1, CC->redirect_fp);
414 if (CC->redirect_sock > 0) {
415 sock = CC->redirect_sock; /* and continue below... */
418 sock = CC->client_socket;
421 while (bytes_written < nbytes) {
422 retval = write(sock, &buf[bytes_written],
423 nbytes - bytes_written);
425 lprintf(2, "client_write() failed: %s\n",
427 if (sock == CC->client_socket) CC->kill_me = 1;
430 bytes_written = bytes_written + retval;
436 * cprintf() ... Send formatted printable data to the client. It is
437 * implemented in terms of client_write() but remains in
438 * sysdep.c in case we port to somewhere without va_args...
440 void cprintf(const char *format, ...) {
444 va_start(arg_ptr, format);
445 if (vsnprintf(buf, sizeof buf, format, arg_ptr) == -1)
446 buf[sizeof buf - 2] = '\n';
447 client_write(buf, strlen(buf));
453 * Read data from the client socket.
455 * 1 Requested number of bytes has been read.
456 * 0 Request timed out.
457 * -1 The socket is broken.
458 * If the socket breaks, the session will be terminated.
460 int client_read_to(char *buf, int bytes, int timeout)
470 FD_SET(CC->client_socket, &rfds);
474 retval = select( (CC->client_socket)+1,
475 &rfds, NULL, NULL, &tv);
477 if (FD_ISSET(CC->client_socket, &rfds) == 0) {
481 rlen = read(CC->client_socket, &buf[len], bytes-len);
483 lprintf(2, "client_read() failed: %s\n",
494 * Read data from the client socket with default timeout.
495 * (This is implemented in terms of client_read_to() and could be
496 * justifiably moved out of sysdep.c)
498 int client_read(char *buf, int bytes)
500 return(client_read_to(buf, bytes, config.c_sleeping));
505 * client_gets() ... Get a LF-terminated line of text from the client.
506 * (This is implemented in terms of client_read() and could be
507 * justifiably moved out of sysdep.c)
509 int client_gets(char *buf)
513 /* Read one character at a time.
516 retval = client_read(&buf[i], 1);
517 if (retval != 1 || buf[i] == '\n' || i == 255)
521 /* If we got a long line, discard characters until the newline.
524 while (buf[i] != '\n' && retval == 1)
525 retval = client_read(&buf[i], 1);
527 /* Strip the trailing newline and any trailing nonprintables (cr's)
530 while ((strlen(buf)>0)&&(!isprint(buf[strlen(buf)-1])))
531 buf[strlen(buf)-1] = 0;
538 * The system-dependent part of master_cleanup() - close the master socket.
540 void sysdep_master_cleanup(void) {
541 struct ServiceFunctionHook *serviceptr;
544 * close all protocol master sockets
546 for (serviceptr = ServiceHookTable; serviceptr != NULL;
547 serviceptr = serviceptr->next ) {
548 lprintf(3, "Closing listener on port %d\n",
549 serviceptr->tcp_port);
550 close(serviceptr->msock);
552 /* If it's a Unix domain socket, remove the file. */
553 if (serviceptr->sockpath != NULL) {
554 unlink(serviceptr->sockpath);
561 * Terminate another session.
562 * (This could justifiably be moved out of sysdep.c because it
563 * no longer does anything that is system-dependent.)
565 void kill_session(int session_to_kill) {
566 struct CitContext *ptr;
568 begin_critical_section(S_SESSION_TABLE);
569 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
570 if (ptr->cs_pid == session_to_kill) {
574 end_critical_section(S_SESSION_TABLE);
581 * Start running as a daemon. Only close stdio if do_close_stdio is set.
583 void start_daemon(int do_close_stdio) {
584 if (do_close_stdio) {
589 signal(SIGHUP,SIG_IGN);
590 signal(SIGINT,SIG_IGN);
591 signal(SIGQUIT,SIG_IGN);
592 if (fork()!=0) exit(0);
598 * Tie in to the 'netsetup' program.
600 * (We're going to hope that netsetup never feeds more than 4096 bytes back.)
602 void cmd_nset(char *cmdbuf)
609 char netsetup_args[3][256];
611 if (CC->usersupp.axlevel < 6) {
612 cprintf("%d Higher access required.\n",
613 ERROR + HIGHER_ACCESS_REQUIRED);
617 for (a=1; a<=3; ++a) {
618 if (num_parms(cmdbuf) >= a) {
619 extract(netsetup_args[a-1], cmdbuf, a-1);
620 for (b=0; b<strlen(netsetup_args[a-1]); ++b) {
621 if (netsetup_args[a-1][b] == 34) {
622 netsetup_args[a-1][b] = '_';
627 netsetup_args[a-1][0] = 0;
631 sprintf(fbuf, "./netsetup \"%s\" \"%s\" \"%s\" </dev/null 2>&1",
632 netsetup_args[0], netsetup_args[1], netsetup_args[2]);
633 netsetup = popen(fbuf, "r");
634 if (netsetup == NULL) {
635 cprintf("%d %s\n", ERROR, strerror(errno));
640 while (ch = getc(netsetup), (ch > 0)) {
641 fbuf[strlen(fbuf)+1] = 0;
642 fbuf[strlen(fbuf)] = ch;
645 retcode = pclose(netsetup);
648 for (a=0; a<strlen(fbuf); ++a) {
649 if (fbuf[a] < 32) fbuf[a] = 32;
652 cprintf("%d %s\n", ERROR, fbuf);
656 cprintf("%d Command succeeded. Output follows:\n", LISTING_FOLLOWS);
658 if (fbuf[strlen(fbuf)-1] != 10) cprintf("\n");
665 * Generic routine to convert a login name to a full name (gecos)
666 * Returns nonzero if a conversion took place
668 int convert_login(char NameToConvert[]) {
672 pw = getpwnam(NameToConvert);
677 strcpy(NameToConvert, pw->pw_gecos);
678 for (a=0; a<strlen(NameToConvert); ++a) {
679 if (NameToConvert[a] == ',') NameToConvert[a] = 0;
688 * Purge all sessions which have the 'kill_me' flag set.
689 * This function has code to prevent it from running more than once every
690 * few seconds, because running it after every single unbind would waste a lot
691 * of CPU time and keep the context list locked too much.
693 * After that's done, we raise or lower the size of the worker thread pool
694 * if such an action is appropriate.
696 void dead_session_purge(void) {
697 struct CitContext *ptr, *rem;
701 if ( (time(NULL) - last_purge) < 5 ) return; /* Too soon, go away */
706 begin_critical_section(S_SESSION_TABLE);
707 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
708 if ( (ptr->state == CON_IDLE) && (ptr->kill_me) ) {
712 end_critical_section(S_SESSION_TABLE);
714 /* RemoveContext() enters its own S_SESSION_TABLE critical
715 * section, so we have to do it like this.
718 lprintf(9, "Purging session %d\n", rem->cs_pid);
722 } while (rem != NULL);
725 /* Raise or lower the size of the worker thread pool if such
726 * an action is appropriate.
729 if ( (num_sessions > num_threads)
730 && (num_threads < config.c_max_workers) ) {
732 pthread_attr_init(&attr);
733 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
734 if (pthread_create(&newthread, &attr,
735 (void* (*)(void*)) worker_thread, NULL) != 0) {
736 lprintf(1, "Can't create worker thead: %s\n",
742 else if ( (num_sessions < num_threads)
743 && (num_threads > config.c_min_workers) ) {
755 * Redirect a session's output to a file or socket.
756 * This function may be called with a file handle *or* a socket (but not
757 * both). Call with neither to return output to its normal client socket.
759 void CtdlRedirectOutput(FILE *fp, int sock) {
761 if (fp != NULL) CC->redirect_fp = fp;
762 else CC->redirect_fp = NULL;
764 if (sock > 0) CC->redirect_sock = sock;
765 else CC->redirect_sock = (-1);
771 * masterCC is the context we use when not attached to a session. This
772 * function initializes it.
774 void InitializeMasterCC(void) {
775 memset(&masterCC, 0, sizeof(struct CitContext));
776 masterCC.internal_pgm = 1;
782 * Here's where it all begins.
784 int main(int argc, char **argv)
786 pthread_t HousekeepingThread; /* Thread descriptor */
787 pthread_attr_t attr; /* Thread attributes */
788 char tracefile[128]; /* Name of file to log traces to */
789 int a, i; /* General-purpose variables */
791 int drop_root_perms = 1;
793 struct ServiceFunctionHook *serviceptr;
795 /* specify default port name and trace file */
796 strcpy(tracefile, "");
798 /* initialize the master context */
799 InitializeMasterCC();
801 /* parse command-line arguments */
802 for (a=1; a<argc; ++a) {
804 /* -t specifies where to log trace messages to */
805 if (!strncmp(argv[a], "-t", 2)) {
806 strcpy(tracefile, argv[a]);
807 strcpy(tracefile, &tracefile[2]);
808 freopen(tracefile, "r", stdin);
809 freopen(tracefile, "w", stdout);
810 freopen(tracefile, "w", stderr);
813 /* run in the background if -d was specified */
814 else if (!strcmp(argv[a], "-d")) {
815 start_daemon( (strlen(tracefile) > 0) ? 0 : 1 ) ;
818 /* -x specifies the desired logging level */
819 else if (!strncmp(argv[a], "-x", 2)) {
820 verbosity = atoi(&argv[a][2]);
823 else if (!strncmp(argv[a], "-h", 2)) {
824 safestrncpy(bbs_home_directory, &argv[a][2],
825 sizeof bbs_home_directory);
829 else if (!strncmp(argv[a], "-f", 2)) {
833 /* -r tells the server not to drop root permissions. don't use
834 * this unless you know what you're doing. this should be
835 * removed in the next release if it proves unnecessary. */
836 else if (!strcmp(argv[a], "-r"))
839 /* any other parameter makes it crash and burn */
841 lprintf(1, "citserver: usage: "
842 "citserver [-tTraceFile] [-d] [-f]"
843 " [-xLogLevel] [-hHomeDir]\n");
849 /* Tell 'em who's in da house */
851 "\nMultithreaded message server for Citadel/UX\n"
852 "Copyright (C) 1987-2000 by the Citadel/UX development team.\n"
853 "Citadel/UX is free software, covered by the GNU General Public License, and\n"
854 "you are welcome to change it and/or distribute copies of it under certain\n"
855 "conditions. There is absolutely no warranty for this software. Please\n"
856 "read the 'COPYING.txt' file for details.\n\n");
860 openlog("citserver", LOG_PID, LOG_USER);
862 /* Load site-specific parameters */
863 lprintf(7, "Loading citadel.config\n");
867 * Do non system dependent startup functions.
872 * Bind the server to our favorite ports.
874 CtdlRegisterServiceHook(config.c_port_number, /* TCP */
876 citproto_begin_session,
878 CtdlRegisterServiceHook(0, /* Unix */
880 citproto_begin_session,
884 * Load any server-side modules (plugins) available here.
886 lprintf(7, "Initializing loadable modules\n");
887 if ((moddir = malloc(strlen(bbs_home_directory) + 9)) != NULL) {
888 sprintf(moddir, "%s/modules", bbs_home_directory);
889 DLoader_Init(moddir);
894 * The rescan pipe exists so that worker threads can be woken up and
895 * told to re-scan the context list for fd's to listen on. This is
896 * necessary, for example, when a context is about to go idle and needs
897 * to get back on that list.
900 lprintf(1, "Can't create rescan pipe!\n");
905 * Set up a fd_set containing all the master sockets to which we
906 * always listen. It's computationally less expensive to just copy
907 * this to a local fd_set when starting a new select() and then add
908 * the client sockets than it is to initialize a new one and then
909 * figure out what to put there.
913 FD_SET(rescan[0], &masterfds);
914 if (rescan[0] > masterhighest) masterhighest = rescan[0];
916 for (serviceptr = ServiceHookTable; serviceptr != NULL;
917 serviceptr = serviceptr->next ) {
918 FD_SET(serviceptr->msock, &masterfds);
919 if (serviceptr->msock > masterhighest) {
920 masterhighest = serviceptr->msock;
926 * Now that we've bound the sockets, change to the BBS user id and its
927 * corresponding group ids
929 if (drop_root_perms) {
930 if ((pw = getpwuid(BBSUID)) == NULL)
931 lprintf(1, "WARNING: getpwuid(%d): %s\n"
932 "Group IDs will be incorrect.\n", BBSUID,
935 initgroups(pw->pw_name, pw->pw_gid);
936 if (setgid(pw->pw_gid))
937 lprintf(3, "setgid(%d): %s\n", pw->pw_gid,
940 lprintf(7, "Changing uid to %d\n", BBSUID);
941 if (setuid(BBSUID) != 0) {
942 lprintf(3, "setuid() failed: %s\n", strerror(errno));
947 * Create the housekeeper thread
949 lprintf(7, "Starting housekeeper thread\n");
950 pthread_attr_init(&attr);
951 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
952 if (pthread_create(&HousekeepingThread, &attr,
953 (void* (*)(void*)) housekeeping_loop, NULL) != 0) {
954 lprintf(1, "Can't create housekeeping thead: %s\n",
960 * Now create a bunch of worker threads.
962 for (i=0; i<(config.c_min_workers-1); ++i) {
963 pthread_attr_init(&attr);
964 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
965 if (pthread_create(&HousekeepingThread, &attr,
966 (void* (*)(void*)) worker_thread, NULL) != 0) {
967 lprintf(1, "Can't create worker thead: %s\n",
972 /* Now this thread can become a worker as well. */
980 * Bind a thread to a context.
982 inline void become_session(struct CitContext *which_con) {
983 pthread_setspecific(MyConKey, (void *)which_con );
989 * This loop just keeps going and going and going...
991 void worker_thread(void) {
995 struct CitContext *ptr;
996 struct CitContext *bind_me = NULL;
999 struct CitContext *con= NULL; /* Temporary context pointer */
1000 struct ServiceFunctionHook *serviceptr;
1001 struct sockaddr_in fsin; /* Data for master socket */
1002 int alen; /* Data for master socket */
1003 int ssock; /* Descriptor for client socket */
1008 while (!time_to_die) {
1011 * A naive implementation would have all idle threads
1012 * calling select() and then they'd all wake up at once. We
1013 * solve this problem by putting the select() in a critical
1014 * section, so only one thread has the opportunity to wake
1015 * up. If we wake up on the master socket, create a new
1016 * session context; otherwise, just bind the thread to the
1017 * context we want and go on our merry way.
1020 begin_critical_section(S_I_WANNA_SELECT);
1021 SETUP_FD: memcpy(&readfds, &masterfds, sizeof(fd_set) );
1022 highest = masterhighest;
1023 begin_critical_section(S_SESSION_TABLE);
1024 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
1025 if (ptr->state == CON_IDLE) {
1026 FD_SET(ptr->client_socket, &readfds);
1027 if (ptr->client_socket > highest)
1028 highest = ptr->client_socket;
1031 end_critical_section(S_SESSION_TABLE);
1033 tv.tv_sec = 60; /* wake up every minute if no input */
1035 retval = select(highest + 1, &readfds, NULL, NULL, &tv);
1037 /* Now figure out who made this select() unblock.
1038 * First, check for an error or exit condition.
1041 end_critical_section(S_I_WANNA_SELECT);
1042 lprintf(9, "Exiting (%s)\n", strerror(errno));
1046 /* Next, check to see if it's a new client connecting
1047 * on a master socket.
1049 else for (serviceptr = ServiceHookTable; serviceptr != NULL;
1050 serviceptr = serviceptr->next ) {
1052 if (FD_ISSET(serviceptr->msock, &readfds)) {
1054 ssock = accept(serviceptr->msock,
1055 (struct sockaddr *)&fsin, &alen);
1057 lprintf(2, "citserver: accept(): %s\n",
1061 lprintf(7, "citserver: "
1062 "New client socket %d\n",
1065 /* New context will be created already
1066 * set up in the CON_EXECUTING state.
1068 con = CreateNewContext();
1070 /* Assign new socket number to it. */
1071 con->client_socket = ssock;
1072 con->h_command_function =
1073 serviceptr->h_command_function;
1075 /* Determine whether local socket */
1076 if (serviceptr->sockpath != NULL)
1077 con->is_local_socket = 1;
1079 /* Set the SO_REUSEADDR socket option */
1081 setsockopt(ssock, SOL_SOCKET,
1085 become_session(con);
1087 serviceptr->h_greeting_function();
1088 become_session(NULL);
1089 con->state = CON_IDLE;
1095 /* If the rescan pipe went active, someone is telling this
1096 * thread that the &readfds needs to be refreshed with more
1102 if (FD_ISSET(rescan[0], &readfds)) {
1103 read(rescan[0], &junk, 1);
1107 /* It must be a client socket. Find a context that has data
1108 * waiting on its socket *and* is in the CON_IDLE state.
1112 begin_critical_section(S_SESSION_TABLE);
1113 for (ptr = ContextList;
1114 ( (ptr != NULL) && (bind_me == NULL) );
1116 if ( (FD_ISSET(ptr->client_socket, &readfds))
1117 && (ptr->state == CON_IDLE) ) {
1121 if (bind_me != NULL) {
1122 /* Found one. Stake a claim to it before
1123 * letting anyone else touch the context list.
1125 bind_me->state = CON_EXECUTING;
1128 end_critical_section(S_SESSION_TABLE);
1129 end_critical_section(S_I_WANNA_SELECT);
1131 /* We're bound to a session, now do *one* command */
1132 if (bind_me != NULL) {
1133 become_session(bind_me);
1134 CC->h_command_function();
1135 become_session(NULL);
1136 bind_me->state = CON_IDLE;
1137 if (bind_me->kill_me == 1) {
1138 RemoveContext(bind_me);
1140 write(rescan[1], &junk, 1);
1144 dead_session_purge();
1145 if ((time(NULL) - last_timer) > 60L) {
1146 last_timer = time(NULL);
1147 PerformSessionHooks(EVT_TIMER);
1151 /* If control reaches this point, the server is shutting down */