citadel
About: Citadel is an advanced messaging and collaboration system for groupware and BBS applications (preferred OS: Linux).
  Fossies Dox: citadel.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

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sysdep.c
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1// This started as a portability layer, but then everything got more standard.
2// Most of it handles network communication.
3//
4// Copyright (c) 1987-2023 by the citadel.org team
5//
6// This program is open source software. Use, duplication, or disclosure
7// is subject to the terms of the GNU General Public License, version 3.
8
9#include "sysdep.h"
10#include <stdlib.h>
11#include <unistd.h>
12#include <sys/stat.h>
13#include <errno.h>
14#include <signal.h>
15#include <stdio.h>
16#include <syslog.h>
17#include <sys/syslog.h>
18#include <execinfo.h>
19#include <netdb.h>
20#include <sys/un.h>
21#include <sys/types.h>
22#include <sys/socket.h>
23#include <netinet/in.h>
24#include <arpa/inet.h>
25#include <netinet/tcp.h>
26#include <arpa/inet.h>
27#define SHOW_ME_VAPPEND_PRINTF
28#include <libcitadel.h>
29#include "citserver.h"
30#include "config.h"
31#include "ctdl_module.h"
32#include "sysdep_decls.h"
33#include "modules/crypto/serv_crypto.h" // Needed for init_ssl, client_write_ssl, client_read_ssl
34#include "housekeeping.h"
35#include "context.h"
36
37// Signal handler to shut down the server.
38volatile int exit_signal = 0;
39volatile int shutdown_and_halt = 0;
40volatile int restart_server = 0;
41volatile int running_as_daemon = 0;
42
43
44static RETSIGTYPE signal_cleanup(int signum) {
45 syslog(LOG_DEBUG, "sysdep: caught signal %d", signum);
46 signal(SIGINT, SIG_DFL);
47 signal(SIGHUP, SIG_DFL);
48 signal(SIGTERM, SIG_DFL);
49 //signal(SIGSEGV, SIG_DFL);
50 exit_signal = signum;
52 master_cleanup(signum);
53}
54
55
56// Some initialization stuff...
57void init_sysdep(void) {
58 sigset_t set;
59
60 // Avoid vulnerabilities related to FD_SETSIZE if we can.
61#ifdef FD_SETSIZE
62#ifdef RLIMIT_NOFILE
63 struct rlimit rl;
64 getrlimit(RLIMIT_NOFILE, &rl);
65 rl.rlim_cur = FD_SETSIZE;
66 rl.rlim_max = FD_SETSIZE;
67 setrlimit(RLIMIT_NOFILE, &rl);
68#endif
69#endif
70
71 // If we've got OpenSSL, we're going to use it.
72#ifdef HAVE_OPENSSL
73 init_ssl();
74#endif
75
76 if (pthread_key_create(&MyConKey, NULL) != 0) { // TSD for sessions
77 syslog(LOG_CRIT, "sysdep: can't create TSD key: %m");
78 exit(CTDLEXIT_THREAD);
79 }
80
81 // Interript, hangup, and terminate signals should cause the server to shut down.
82 sigemptyset(&set);
83 sigaddset(&set, SIGINT);
84 sigaddset(&set, SIGHUP);
85 sigaddset(&set, SIGTERM);
86 //sigaddset(&set, SIGSEGV);
87 sigprocmask(SIG_UNBLOCK, &set, NULL);
88
89 signal(SIGINT, signal_cleanup);
90 signal(SIGHUP, signal_cleanup);
91 signal(SIGTERM, signal_cleanup);
92 //signal(SIGSEGV, signal_cleanup);
93
94 // Do not shut down the server on broken pipe signals, otherwise the
95 // whole Citadel service would come down whenever a single client
96 // socket breaks.
97 signal(SIGPIPE, SIG_IGN);
98}
99
100
101// This is a generic function to set up a master socket for listening on
102// a TCP port. The server shuts down if the bind fails. (IPv4/IPv6 version)
103//
104// ip_addr IP address to bind
105// port_number port number to bind
106// queue_len number of incoming connections to allow in the queue
107int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len) {
108 struct protoent *p;
109 struct sockaddr_in6 sin6;
110 struct sockaddr_in sin4;
111 int s, i, b;
112 int ip_version = 6;
113
114 memset(&sin6, 0, sizeof(sin6));
115 memset(&sin4, 0, sizeof(sin4));
116 sin6.sin6_family = AF_INET6;
117 sin4.sin_family = AF_INET;
118
119 if ( (ip_addr == NULL) // any IPv6
120 || (IsEmptyStr(ip_addr))
121 || (!strcmp(ip_addr, "*"))
122 || (!strcmp(ip_addr, "::"))
123 ) {
124 ip_version = 6;
125 sin6.sin6_addr = in6addr_any;
126 }
127 else if (!strcmp(ip_addr, "0.0.0.0")) { // any IPv4
128 ip_version = 4;
129 sin4.sin_addr.s_addr = INADDR_ANY;
130 }
131 else if ((strchr(ip_addr, '.')) && (!strchr(ip_addr, ':'))) { // specific IPv4
132 ip_version = 4;
133 if (inet_pton(AF_INET, ip_addr, &sin4.sin_addr) <= 0) {
134 syslog(LOG_ALERT, "tcpserver: inet_pton: %m");
135 return (-1);
136 }
137 }
138 else { // specific IPv6
139 ip_version = 6;
140 if (inet_pton(AF_INET6, ip_addr, &sin6.sin6_addr) <= 0) {
141 syslog(LOG_ALERT, "tcpserver: inet_pton: %m");
142 return (-1);
143 }
144 }
145
146 if (port_number == 0) {
147 syslog(LOG_ALERT, "tcpserver: no port number was specified");
148 return (-1);
149 }
150 sin6.sin6_port = htons((u_short) port_number);
151 sin4.sin_port = htons((u_short) port_number);
152
153 p = getprotobyname("tcp");
154 if (p == NULL) {
155 syslog(LOG_ALERT, "tcpserver: getprotobyname: %m");
156 return (-1);
157 }
158
159 s = socket( ((ip_version == 6) ? PF_INET6 : PF_INET), SOCK_STREAM, (p->p_proto));
160 if (s < 0) {
161 syslog(LOG_ALERT, "tcpserver: socket: %m");
162 return (-1);
163 }
164 // Set some socket options that make sense.
165 i = 1;
166 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
167
168 if (ip_version == 6) {
169 b = bind(s, (struct sockaddr *) &sin6, sizeof(sin6));
170 }
171 else {
172 b = bind(s, (struct sockaddr *) &sin4, sizeof(sin4));
173 }
174
175 if (b < 0) {
176 syslog(LOG_ALERT, "tcpserver: bind: %m");
177 return (-1);
178 }
179
180 fcntl(s, F_SETFL, O_NONBLOCK);
181
182 if (listen(s, ((queue_len >= 5) ? queue_len : 5) ) < 0) {
183 syslog(LOG_ALERT, "tcpserver: listen: %m");
184 return (-1);
185 }
186 return (s);
187}
188
189
190// Create a Unix domain socket and listen on it
191int ctdl_uds_server(char *sockpath, int queue_len) {
192 struct sockaddr_un addr;
193 int s;
194 int i;
195 int actual_queue_len;
196
197 actual_queue_len = queue_len;
198 if (actual_queue_len < 5) actual_queue_len = 5;
199
200 i = unlink(sockpath);
201 if ((i != 0) && (errno != ENOENT)) {
202 syslog(LOG_ERR, "udsserver: %m");
203 return(-1);
204 }
205
206 memset(&addr, 0, sizeof(addr));
207 addr.sun_family = AF_UNIX;
208 safestrncpy(addr.sun_path, sockpath, sizeof addr.sun_path);
209
210 s = socket(AF_UNIX, SOCK_STREAM, 0);
211 if (s < 0) {
212 syslog(LOG_ERR, "udsserver: socket: %m");
213 return(-1);
214 }
215
216 if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
217 syslog(LOG_ERR, "udsserver: bind: %m");
218 return(-1);
219 }
220
221 // set to nonblock - we need this for some obscure situations
222 if (fcntl(s, F_SETFL, O_NONBLOCK) < 0) {
223 syslog(LOG_ERR, "udsserver: fcntl: %m");
224 close(s);
225 return(-1);
226 }
227
228 if (listen(s, actual_queue_len) < 0) {
229 syslog(LOG_ERR, "udsserver: listen: %m");
230 return(-1);
231 }
232
233 chmod(sockpath, S_ISGID|S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
234 return(s);
235}
236
237
238// The following functions implement output buffering on operating systems which
239// support it (such as Linux and various BSD flavors).
240#ifndef HAVE_DARWIN
241#ifdef TCP_CORK
242# define HAVE_TCP_BUFFERING
243#else
244# ifdef TCP_NOPUSH
245# define HAVE_TCP_BUFFERING
246# define TCP_CORK TCP_NOPUSH
247# endif
248#endif // TCP_CORK
249#endif // HAVE_DARWIN
250
251static unsigned on = 1, off = 0;
252
253void buffer_output(void) {
254#ifdef HAVE_TCP_BUFFERING
255#ifdef HAVE_OPENSSL
256 if (!CC->redirect_ssl)
257#endif
258 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
259#endif
260}
261
262void unbuffer_output(void) {
263#ifdef HAVE_TCP_BUFFERING
264#ifdef HAVE_OPENSSL
265 if (!CC->redirect_ssl)
266#endif
267 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
268#endif
269}
270
271void flush_output(void) {
272#ifdef HAVE_TCP_BUFFERING
273 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &off, 4);
274 setsockopt(CC->client_socket, IPPROTO_TCP, TCP_CORK, &on, 4);
275#endif
276}
277
278
279// close the client socket
280void client_close(void) {
281 if (!CC) return;
282 if (CC->client_socket <= 0) return;
283 syslog(LOG_DEBUG, "sysdep: closing socket %d", CC->client_socket);
284 close(CC->client_socket);
285 CC->client_socket = -1 ;
286}
287
288
289// Send binary data to the client.
290int client_write(const char *buf, int nbytes) {
291 int bytes_written = 0;
292 int retval;
293#ifndef HAVE_TCP_BUFFERING
294 int old_buffer_len = 0;
295#endif
296 fd_set wset;
297 CitContext *Ctx;
298 int fdflags;
299
300 if (nbytes < 1) return(0);
301
302 Ctx = CC;
303 if (Ctx->redirect_buffer != NULL) {
304 StrBufAppendBufPlain(Ctx->redirect_buffer, buf, nbytes, 0);
305 return 0;
306 }
307
308#ifdef HAVE_OPENSSL
309 if (Ctx->redirect_ssl) {
310 client_write_ssl(buf, nbytes);
311 return 0;
312 }
313#endif
314 if (Ctx->client_socket == -1) return -1;
315
316 fdflags = fcntl(Ctx->client_socket, F_GETFL);
317
318 while ((bytes_written < nbytes) && (Ctx->client_socket != -1)){
319 if ((fdflags & O_NONBLOCK) == O_NONBLOCK) {
320 FD_ZERO(&wset);
321 FD_SET(Ctx->client_socket, &wset);
322 if (select(1, NULL, &wset, NULL, NULL) == -1) {
323 if (errno == EINTR) {
324 syslog(LOG_DEBUG, "sysdep: client_write(%d bytes) select() interrupted.", nbytes-bytes_written);
326 CC->kill_me = KILLME_SELECT_INTERRUPTED;
327 return (-1);
328 }
329 else {
330 // can't trust fd's and stuff so we need to re-create them
331 continue;
332 }
333 }
334 else {
335 syslog(LOG_ERR, "sysdep: client_write(%d bytes) select failed: %m", nbytes - bytes_written);
336 client_close();
338 return -1;
339 }
340 }
341 }
342
343 retval = write(Ctx->client_socket, &buf[bytes_written], nbytes - bytes_written);
344 if (retval < 1) {
345 syslog(LOG_ERR, "sysdep: client_write(%d bytes) failed: %m", nbytes - bytes_written);
346 client_close();
348 return -1;
349 }
350 bytes_written = bytes_written + retval;
351 }
352 return 0;
353}
354
355
356void cputbuf(const StrBuf *Buf) {
357 client_write(ChrPtr(Buf), StrLength(Buf));
358}
359
360
361// Send formatted printable data to the client.
362// Implemented in terms of client_write() so it's technically not sysdep...
363void cprintf(const char *format, ...) {
364 va_list arg_ptr;
365 char buf[1024];
366 int rc;
367
368 va_start(arg_ptr, format);
369 rc = vsnprintf(buf, sizeof buf, format, arg_ptr);
370 if (rc < 0) {
371 syslog(LOG_ERR,"Console output error occured. Format: %s",format);
372 } else {
373 if (rc >= sizeof buf) {
374 // Output was truncated.
375 // Chop at the end of the buffer
376 buf[sizeof buf - 2] = '\n';
377 buf[sizeof buf - 1] = 0;
378 }
379 client_write(buf, strlen(buf));
380 }
381 va_end(arg_ptr);
382}
383
384
385// Read data from the client socket.
386//
387// sock socket fd to read from
388// buf buffer to read into
389// bytes number of bytes to read
390// timeout Number of seconds to wait before timing out
391//
392// Possible return values:
393// 1 Requested number of bytes has been read.
394// 0 Request timed out.
395// -1 Connection is broken, or other error.
396int client_read_blob(StrBuf *Target, int bytes, int timeout) {
397 const char *Error;
398 int retval = 0;
399
400#ifdef HAVE_OPENSSL
401 if (CC->redirect_ssl) {
402 retval = client_read_sslblob(Target, bytes, timeout);
403 if (retval < 0) {
404 syslog(LOG_ERR, "sysdep: client_read_blob() failed");
405 }
406 }
407 else
408#endif
409 {
410 retval = StrBufReadBLOBBuffered(Target,
411 CC->RecvBuf.Buf,
412 &CC->RecvBuf.ReadWritePointer,
413 &CC->client_socket,
414 1,
415 bytes,
416 O_TERM,
417 &Error
418 );
419 if (retval < 0) {
420 syslog(LOG_ERR, "sysdep: client_read_blob() failed: %s", Error);
421 client_close();
422 return retval;
423 }
424 }
425 return retval;
426}
427
428
429// to make client_read_random_blob() more efficient, increase buffer size.
430// just use in greeting function, else your buffer may be flushed
432 FlushStrBuf(CC->RecvBuf.Buf);
433 ReAdjustEmptyBuf(CC->RecvBuf.Buf, N * SIZ, N * SIZ);
434}
435
436
437int client_read_random_blob(StrBuf *Target, int timeout) {
438 int rc;
439
440 rc = client_read_blob(Target, 1, timeout);
441 if (rc > 0) {
442 long len;
443 const char *pch;
444
445 len = StrLength(CC->RecvBuf.Buf);
446 pch = ChrPtr(CC->RecvBuf.Buf);
447
448 if (len > 0) {
449 if (CC->RecvBuf.ReadWritePointer != NULL) {
450 len -= CC->RecvBuf.ReadWritePointer - pch;
451 pch = CC->RecvBuf.ReadWritePointer;
452 }
453 StrBufAppendBufPlain(Target, pch, len, 0);
454 FlushStrBuf(CC->RecvBuf.Buf);
455 CC->RecvBuf.ReadWritePointer = NULL;
456 return StrLength(Target);
457 }
458 return rc;
459 }
460 else
461 return rc;
462}
463
464
465int client_read_to(char *buf, int bytes, int timeout) {
466 int rc;
467
468 rc = client_read_blob(CC->MigrateBuf, bytes, timeout);
469 if (rc < 0) {
470 *buf = '\0';
471 return rc;
472 }
473 else {
474 memcpy(buf,
475 ChrPtr(CC->MigrateBuf),
476 StrLength(CC->MigrateBuf) + 1);
477 FlushStrBuf(CC->MigrateBuf);
478 return rc;
479 }
480}
481
482
484 if ( (ctx->kill_me != 0)
485 || ( (ctx->RecvBuf.ReadWritePointer == NULL)
486 && (StrLength(ctx->RecvBuf.Buf) == 0)
487 && (ctx->client_socket != -1))
488 )
489 return 0;
490 else
491 return 1;
492}
493
494
495// Read data from the client socket with default timeout.
496// (This is implemented in terms of client_read_to() and could be
497// justifiably moved out of sysdep.c)
498INLINE int client_read(char *buf, int bytes) {
499 return(client_read_to(buf, bytes, CtdlGetConfigInt("c_sleeping")));
500}
501
502
503int CtdlClientGetLine(StrBuf *Target) {
504 const char *Error;
505 int rc;
506
507 FlushStrBuf(Target);
508#ifdef HAVE_OPENSSL
509 if (CC->redirect_ssl) {
510 rc = client_readline_sslbuffer(Target, CC->RecvBuf.Buf, &CC->RecvBuf.ReadWritePointer, 1);
511 return rc;
512 }
513 else
514#endif
515 {
516 rc = StrBufTCP_read_buffered_line_fast(Target,
517 CC->RecvBuf.Buf,
518 &CC->RecvBuf.ReadWritePointer,
519 &CC->client_socket,
520 5,
521 1,
522 &Error
523 );
524 return rc;
525 }
526}
527
528
529// Get a LF-terminated line of text from the client.
530// (This is implemented in terms of client_read() and could be
531// justifiably moved out of sysdep.c)
532int client_getln(char *buf, int bufsize) {
533 int i, retval;
534 const char *pCh;
535
536 retval = CtdlClientGetLine(CC->MigrateBuf);
537 if (retval < 0)
538 return(retval >= 0);
539
540
541 i = StrLength(CC->MigrateBuf);
542 pCh = ChrPtr(CC->MigrateBuf);
543 // Strip the trailing LF, and the trailing CR if present.
544 if (bufsize <= i)
545 i = bufsize - 1;
546 while ( (i > 0)
547 && ( (pCh[i - 1]==13)
548 || ( pCh[i - 1]==10)) ) {
549 i--;
550 }
551 memcpy(buf, pCh, i);
552 buf[i] = 0;
553
554 FlushStrBuf(CC->MigrateBuf);
555 if (retval < 0) {
556 safestrncpy(&buf[i], "000", bufsize - i);
557 }
558 return(retval >= 0);
559}
560
561
562// Generic routine to convert a login name to a full name (gecos)
563// Returns nonzero if a conversion took place
564int convert_login(char NameToConvert[]) {
565 struct passwd *pw;
566 unsigned int a;
567
568 pw = getpwnam(NameToConvert);
569 if (pw == NULL) {
570 return(0);
571 }
572 else {
573 strcpy(NameToConvert, pw->pw_gecos);
574 for (a=0; a<strlen(NameToConvert); ++a) {
575 if (NameToConvert[a] == ',') NameToConvert[a] = 0;
576 }
577 return(1);
578 }
579}
580
581
582void HuntBadSession(void) {
583 int highest;
584 CitContext *ptr;
585 fd_set readfds;
586 struct timeval tv;
587 struct ServiceFunctionHook *serviceptr;
588
589 // Next, add all of the client sockets
591 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
592 if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
593 continue;
594 // Initialize the fdset.
595 FD_ZERO(&readfds);
596 highest = 0;
597 tv.tv_sec = 0; // wake up every second if no input
598 tv.tv_usec = 0;
599
600 // Don't select on dead sessions, only truly idle ones
601 if ( (ptr->state == CON_IDLE)
602 && (ptr->kill_me == 0)
603 && (ptr->client_socket > 0)
604 ) {
605 FD_SET(ptr->client_socket, &readfds);
606 if (ptr->client_socket > highest)
607 highest = ptr->client_socket;
608
609 if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) && (errno == EBADF)) {
610 // Gotcha!
611 syslog(LOG_ERR,
612 "sysdep: killing session CC[%d] bad FD: [%d] User[%s] Host[%s:%s]",
613 ptr->cs_pid,
614 ptr->client_socket,
615 ptr->curr_user,
616 ptr->cs_host,
617 ptr->cs_addr
618 );
619 ptr->kill_me = 1;
620 ptr->client_socket = -1;
621 break;
622 }
623 }
624 }
626
627 // First, add the various master sockets to the fdset.
628 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
629
630 // Initialize the fdset.
631 highest = 0;
632 tv.tv_sec = 0; // wake up every second if no input
633 tv.tv_usec = 0;
634
635 FD_SET(serviceptr->msock, &readfds);
636 if (serviceptr->msock > highest) {
637 highest = serviceptr->msock;
638 }
639 if ((select(highest + 1, &readfds, NULL, NULL, &tv) < 0) && (errno == EBADF)) {
640 // Gotcha! server socket dead? commit suicide!
641 syslog(LOG_ERR, "sysdep: found bad FD: %d and its a server socket! Shutting Down!", serviceptr->msock);
643 break;
644 }
645 }
646}
647
648
649// Main server loop
650// select() can wake up on any of the following conditions:
651// 1. A new client connection on a master socket
652// 2. Received data on a client socket
653// 3. A timer event
654// That's why we are blocking on select() and not accept().
655void *worker_thread(void *blah) {
656 int highest;
657 CitContext *ptr;
658 CitContext *bind_me = NULL;
659 fd_set readfds;
660 int retval = 0;
661 struct timeval tv;
662 int force_purge = 0;
663 struct ServiceFunctionHook *serviceptr;
664 int ssock; // Descriptor for client socket
665 CitContext *con = NULL; // Temporary context pointer
666 int i;
667
668 pthread_mutex_lock(&ThreadCountMutex);
669 ++num_workers;
670 pthread_mutex_unlock(&ThreadCountMutex);
671
672 while (!server_shutting_down) {
673
674 // make doubly sure we're not holding any stale db handles which might cause a deadlock
676do_select: force_purge = 0;
677 bind_me = NULL; // Which session shall we handle?
678
679 // Initialize the fdset
680 FD_ZERO(&readfds);
681 highest = 0;
682
683 // First, add the various master sockets to the fdset.
684 for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next ) {
685 FD_SET(serviceptr->msock, &readfds);
686 if (serviceptr->msock > highest) {
687 highest = serviceptr->msock;
688 }
689 }
690
691 // Next, add all of the client sockets.
693 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
694 if ((ptr->state == CON_SYS) && (ptr->client_socket == 0))
695 continue;
696
697 // Don't select on dead sessions, only truly idle ones
698 if ( (ptr->state == CON_IDLE)
699 && (ptr->kill_me == 0)
700 && (ptr->client_socket > 0)
701 ) {
702 FD_SET(ptr->client_socket, &readfds);
703 if (ptr->client_socket > highest)
704 highest = ptr->client_socket;
705 }
706 if ((bind_me == NULL) && (ptr->state == CON_READY)) {
707 bind_me = ptr;
708 ptr->state = CON_EXECUTING;
709 break;
710 }
711 if ((bind_me == NULL) && (ptr->state == CON_GREETING)) {
712 bind_me = ptr;
713 ptr->state = CON_STARTING;
714 break;
715 }
716 }
718
719 if (bind_me) { // don't search for a session to bind to.
720 goto SKIP_SELECT; // we already found one.
721 }
722
723 // If we got this far, it means that there are no sessions
724 // which a previous thread marked for attention, so we go
725 // ahead and get ready to select().
726
728 tv.tv_sec = 1; // wake up every second if no input
729 tv.tv_usec = 0;
730 retval = select(highest + 1, &readfds, NULL, NULL, &tv);
731 }
732 else {
733 --num_workers;
734 return NULL;
735 }
736
737 // Now figure out who made this select() unblock.
738 // First, check for an error or exit condition.
739 if (retval < 0) {
740 if (errno == EBADF) {
741 syslog(LOG_ERR, "sysdep: select() failed: %m");
743 goto do_select;
744 }
745 if (errno != EINTR) {
746 syslog(LOG_ERR, "sysdep: exiting: %m");
748 continue;
749 } else {
751 --num_workers;
752 return(NULL);
753 }
754 goto do_select;
755 }
756 }
757 else if (retval == 0) {
759 --num_workers;
760 return(NULL);
761 }
762 }
763
764 // Next, check to see if it's a new client connecting on a master socket.
765
766 else if ((retval > 0) && (!server_shutting_down)) for (serviceptr = ServiceHookTable; serviceptr != NULL; serviceptr = serviceptr->next) {
767
768 if (FD_ISSET(serviceptr->msock, &readfds)) {
769 ssock = accept(serviceptr->msock, NULL, 0);
770 if (ssock >= 0) {
771 syslog(LOG_DEBUG, "sysdep: new client socket %d", ssock);
772
773 // The master socket is non-blocking but the client
774 // sockets need to be blocking, otherwise certain
775 // operations barf on FreeBSD. Not a fatal error.
776 if (fcntl(ssock, F_SETFL, 0) < 0) {
777 syslog(LOG_ERR, "sysdep: Can't set socket to blocking: %m");
778 }
779
780 // New context will be created already
781 // set up in the CON_EXECUTING state.
782 con = CreateNewContext();
783
784 // Assign our new socket number to it.
785 con->tcp_port = serviceptr->tcp_port;
786 con->client_socket = ssock;
787 con->h_command_function = serviceptr->h_command_function;
788 con->h_async_function = serviceptr->h_async_function;
789 con->h_greeting_function = serviceptr->h_greeting_function;
790 con->ServiceName = serviceptr->ServiceName;
791
792 // Connections on a local client are always from the same host
793 if (serviceptr->sockpath != NULL) {
794 con->is_local_client = 1;
795 }
796
797 // Set the SO_REUSEADDR socket option
798 i = 1;
799 setsockopt(ssock, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));
800 con->state = CON_GREETING;
801 retval--;
802 if (retval == 0)
803 break;
804 }
805 }
806 }
807
808 // It must be a client socket. Find a context that has data
809 // waiting on its socket *and* is in the CON_IDLE state. Any
810 // active sockets other than our chosen one are marked as
811 // CON_READY so the next thread that comes around can just bind
812 // to one without having to select() again.
814 for (ptr = ContextList; ptr != NULL; ptr = ptr->next) {
815 int checkfd = ptr->client_socket;
816 if ((checkfd != -1) && (ptr->state == CON_IDLE)){
817 if (FD_ISSET(checkfd, &readfds)) {
818 ptr->input_waiting = 1;
819 if (!bind_me) {
820 bind_me = ptr; // I choose you!
821 bind_me->state = CON_EXECUTING;
822 }
823 else {
824 ptr->state = CON_READY;
825 }
826 }
827 else if ((ptr->is_async) && (ptr->async_waiting) && (ptr->h_async_function)) {
828 if (!bind_me) {
829 bind_me = ptr; // I choose you!
830 bind_me->state = CON_EXECUTING;
831 }
832 else {
833 ptr->state = CON_READY;
834 }
835 }
836 }
837 }
839
840SKIP_SELECT:
841 // We're bound to a session
842 pthread_mutex_lock(&ThreadCountMutex);
844 pthread_mutex_unlock(&ThreadCountMutex);
845
846 if (bind_me != NULL) {
847 become_session(bind_me);
848
849 if (bind_me->state == CON_STARTING) {
850 bind_me->state = CON_EXECUTING;
851 begin_session(bind_me);
852 bind_me->h_greeting_function();
853 }
854 // If the client has sent a command, execute it.
855 if (CC->input_waiting) {
856 CC->h_command_function();
857
858 while (HaveMoreLinesWaiting(CC))
859 CC->h_command_function();
860
861 CC->input_waiting = 0;
862 }
863
864 // If there are asynchronous messages waiting and the client supports it, do those now
865 if ((CC->is_async) && (CC->async_waiting) && (CC->h_async_function != NULL)) {
866 CC->h_async_function();
867 CC->async_waiting = 0;
868 }
869
870 force_purge = CC->kill_me;
871 become_session(NULL);
872 bind_me->state = CON_IDLE;
873 }
874
875 dead_session_purge(force_purge);
877
878 pthread_mutex_lock(&ThreadCountMutex);
880 pthread_mutex_unlock(&ThreadCountMutex);
881 }
882
883 // If control reaches this point, the server is shutting down
884 return(NULL);
885}
886
887
888// SyslogFacility()
889// Translate text facility name to syslog.h defined value.
890int SyslogFacility(char *name) {
891 int i;
892 struct {
893 int facility;
894 char *name;
895 } facTbl[] =
896 {
897 { LOG_KERN, "kern" },
898 { LOG_USER, "user" },
899 { LOG_MAIL, "mail" },
900 { LOG_DAEMON, "daemon" },
901 { LOG_AUTH, "auth" },
902 { LOG_SYSLOG, "syslog" },
903 { LOG_LPR, "lpr" },
904 { LOG_NEWS, "news" },
905 { LOG_UUCP, "uucp" },
906 { LOG_LOCAL0, "local0" },
907 { LOG_LOCAL1, "local1" },
908 { LOG_LOCAL2, "local2" },
909 { LOG_LOCAL3, "local3" },
910 { LOG_LOCAL4, "local4" },
911 { LOG_LOCAL5, "local5" },
912 { LOG_LOCAL6, "local6" },
913 { LOG_LOCAL7, "local7" },
914 { 0, NULL }
915 };
916 for(i = 0; facTbl[i].name != NULL; i++) {
917 if(!strcasecmp(name, facTbl[i].name))
918 return facTbl[i].facility;
919 }
920 return LOG_DAEMON;
921}
@ KILLME_SELECT_INTERRUPTED
@ KILLME_SELECT_FAILED
@ KILLME_WRITE_FAILED
#define CTDLEXIT_THREAD
@ S_SESSION_TABLE
void timeout(int signum)
Definition citmail.c:41
void master_cleanup(int exitcode)
Definition citserver.c:124
void begin_session(struct CitContext *con)
Definition context.c:383
int CtdlGetConfigInt(char *key)
Definition config.c:386
CitContext * ContextList
Definition context.c:20
CitContext * CreateNewContext(void)
Definition context.c:269
pthread_key_t MyConKey
Definition context.c:18
void dead_session_purge(int force)
Definition context.c:492
#define CC
Definition context.h:131
static INLINE void become_session(CitContext *which_con)
Definition context.h:161
@ CON_READY
Definition context.h:24
@ CON_SYS
Definition context.h:26
@ CON_IDLE
Definition context.h:21
@ CON_EXECUTING
Definition context.h:25
@ CON_GREETING
Definition context.h:22
@ CON_STARTING
Definition context.h:23
void(* cdb_check_handles)(void)
Definition database.c:36
void do_housekeeping(void)
ServiceFunctionHook * ServiceHookTable
#define INLINE
Definition server.h:14
int cs_pid
Definition context.h:40
long tcp_port
Definition context.h:118
int is_async
Definition context.h:73
const char * ServiceName
Definition context.h:117
CitContext * next
Definition context.h:38
char curr_user[64]
Definition context.h:64
char cs_addr[64]
Definition context.h:83
int kill_me
Definition context.h:45
CCState state
Definition context.h:44
void(* h_greeting_function)(void)
Definition context.h:123
int is_local_client
Definition context.h:55
void(* h_command_function)(void)
Definition context.h:121
StrBuf * redirect_buffer
Definition context.h:57
int async_waiting
Definition context.h:74
char cs_host[64]
Definition context.h:82
void(* h_async_function)(void)
Definition context.h:122
int client_socket
Definition context.h:54
int input_waiting
Definition context.h:75
IOBuffer RecvBuf
Definition context.h:48
void(* h_greeting_function)(void)
void(* h_async_function)(void)
void(* h_command_function)(void)
const char * ServiceName
ServiceFunctionHook * next
#define SIZ
Definition sysconfig.h:22
int SyslogFacility(char *name)
Definition sysdep.c:890
int CtdlClientGetLine(StrBuf *Target)
Definition sysdep.c:503
void cprintf(const char *format,...)
Definition sysdep.c:363
int ctdl_tcp_server(char *ip_addr, int port_number, int queue_len)
Definition sysdep.c:107
int client_read_to(char *buf, int bytes, int timeout)
Definition sysdep.c:465
int client_read_random_blob(StrBuf *Target, int timeout)
Definition sysdep.c:437
int client_getln(char *buf, int bufsize)
Definition sysdep.c:532
int client_write(const char *buf, int nbytes)
Definition sysdep.c:290
void flush_output(void)
Definition sysdep.c:271
void client_close(void)
Definition sysdep.c:280
volatile int restart_server
Definition sysdep.c:40
void buffer_output(void)
Definition sysdep.c:253
volatile int exit_signal
Definition sysdep.c:38
void client_set_inbound_buf(long N)
Definition sysdep.c:431
int client_read_blob(StrBuf *Target, int bytes, int timeout)
Definition sysdep.c:396
void * worker_thread(void *blah)
Definition sysdep.c:655
static unsigned on
Definition sysdep.c:251
static void signal_cleanup(int signum)
Definition sysdep.c:44
static unsigned off
Definition sysdep.c:251
volatile int shutdown_and_halt
Definition sysdep.c:39
INLINE int client_read(char *buf, int bytes)
Definition sysdep.c:498
void unbuffer_output(void)
Definition sysdep.c:262
volatile int running_as_daemon
Definition sysdep.c:41
int convert_login(char NameToConvert[])
Definition sysdep.c:564
int HaveMoreLinesWaiting(CitContext *ctx)
Definition sysdep.c:483
int ctdl_uds_server(char *sockpath, int queue_len)
Definition sysdep.c:191
void HuntBadSession(void)
Definition sysdep.c:582
void cputbuf(const StrBuf *Buf)
Definition sysdep.c:356
void init_sysdep(void)
Definition sysdep.c:57
#define RETSIGTYPE
Definition sysdep.h:30
void begin_critical_section(int which_one)
Definition threads.c:50
void end_critical_section(int which_one)
Definition threads.c:63
pthread_mutex_t ThreadCountMutex
Definition threads.c:23
int active_workers
Definition threads.c:20
int server_shutting_down
Definition threads.c:22
int num_workers
Definition threads.c:19