1/***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22#include "server_setup.h"
23
24/* Purpose
25 *
26 * 1. Accept a TCP connection on a custom port (IPv4 or IPv6), or connect
27 * to a given (localhost) port.
28 *
29 * 2. Get commands on STDIN. Pass data on to the TCP stream.
30 * Get data from TCP stream and pass on to STDOUT.
31 *
32 * This program is made to perform all the socket/stream/connection stuff for
33 * the test suite's (perl) FTP server. Previously the perl code did all of
34 * this by its own, but I decided to let this program do the socket layer
35 * because of several things:
36 *
37 * o We want the perl code to work with rather old perl installations, thus
38 * we cannot use recent perl modules or features.
39 *
40 * o We want IPv6 support for systems that provide it, and doing optional IPv6
41 * support in perl seems if not impossible so at least awkward.
42 *
43 * o We want FTP-SSL support, which means that a connection that starts with
44 * plain sockets needs to be able to "go SSL" in the midst. This would also
45 * require some nasty perl stuff I'd rather avoid.
46 *
47 * (Source originally based on sws.c)
48 */
49
50/*
51 * Signal handling notes for sockfilt
52 * ----------------------------------
53 *
54 * This program is a single-threaded process.
55 *
56 * This program is intended to be highly portable and as such it must be kept
57 * as simple as possible, due to this the only signal handling mechanisms used
58 * will be those of ANSI C, and used only in the most basic form which is good
59 * enough for the purpose of this program.
60 *
61 * For the above reason and the specific needs of this program signals SIGHUP,
62 * SIGPIPE and SIGALRM will be simply ignored on systems where this can be
63 * done. If possible, signals SIGINT and SIGTERM will be handled by this
64 * program as an indication to cleanup and finish execution as soon as
65 * possible. This will be achieved with a single signal handler
66 * 'exit_signal_handler' for both signals.
67 *
68 * The 'exit_signal_handler' upon the first SIGINT or SIGTERM received signal
69 * will just set to one the global var 'got_exit_signal' storing in global var
70 * 'exit_signal' the signal that triggered this change.
71 *
72 * Nothing fancy that could introduce problems is used, the program at certain
73 * points in its normal flow checks if var 'got_exit_signal' is set and in
74 * case this is true it just makes its way out of loops and functions in
75 * structured and well behaved manner to achieve proper program cleanup and
76 * termination.
77 *
78 * Even with the above mechanism implemented it is worthwhile to note that
79 * other signals might still be received, or that there might be systems on
80 * which it is not possible to trap and ignore some of the above signals.
81 * This implies that for increased portability and reliability the program
82 * must be coded as if no signal was being ignored or handled at all. Enjoy
83 * it!
84 */
85
86#ifdef HAVE_SIGNAL_H
87#include <signal.h>
88#endif
89#ifdef HAVE_NETINET_IN_H
90#include <netinet/in.h>
91#endif
92#ifdef HAVE_NETINET_IN6_H
93#include <netinet/in6.h>
94#endif
95#ifdef HAVE_ARPA_INET_H
96#include <arpa/inet.h>
97#endif
98#ifdef HAVE_NETDB_H
99#include <netdb.h>
100#endif
101
102#define ENABLE_CURLX_PRINTF
103/* make the curlx header define all printf() functions to use the curlx_*
104 versions instead */
105#include "curlx.h" /* from the private lib dir */
106#include "getpart.h"
107#include "inet_pton.h"
108#include "util.h"
109#include "server_sockaddr.h"
110#include "warnless.h"
111
112/* include memdebug.h last */
113#include "memdebug.h"
114
115#ifdef USE_WINSOCK
116#undef EINTR
117#define EINTR 4 /* errno.h value */
118#undef EAGAIN
119#define EAGAIN 11 /* errno.h value */
120#undef ENOMEM
121#define ENOMEM 12 /* errno.h value */
122#undef EINVAL
123#define EINVAL 22 /* errno.h value */
124#endif
125
126#define DEFAULT_PORT 8999
127
128#ifndef DEFAULT_LOGFILE
129#define DEFAULT_LOGFILE "log/sockfilt.log"
130#endif
131
132const char *serverlogfile = DEFAULT_LOGFILE;
133
134static bool verbose = FALSE;
135static bool bind_only = FALSE;
136#ifdef ENABLE_IPV6
137static bool use_ipv6 = FALSE;
138#endif
139static const char *ipv_inuse = "IPv4";
140static unsigned short port = DEFAULT_PORT;
141static unsigned short connectport = 0; /* if non-zero, we activate this mode */
142
143enum sockmode {
144 PASSIVE_LISTEN, /* as a server waiting for connections */
145 PASSIVE_CONNECT, /* as a server, connected to a client */
146 ACTIVE, /* as a client, connected to a server */
147 ACTIVE_DISCONNECT /* as a client, disconnected from server */
148};
149
150#ifdef WIN32
151/*
152 * read-wrapper to support reading from stdin on Windows.
153 */
154static ssize_t read_wincon(int fd, void *buf, size_t count)
155{
156 HANDLE handle = NULL;
157 DWORD mode, rcount = 0;
158 BOOL success;
159
160 if(fd == fileno(stdin)) {
161 handle = GetStdHandle(STD_INPUT_HANDLE);
162 }
163 else {
164 return read(fd, buf, count);
165 }
166
167 if(GetConsoleMode(handle, &mode)) {
168 success = ReadConsole(handle, buf, curlx_uztoul(count), &rcount, NULL);
169 }
170 else {
171 success = ReadFile(handle, buf, curlx_uztoul(count), &rcount, NULL);
172 }
173 if(success) {
174 return rcount;
175 }
176
177 errno = GetLastError();
178 return -1;
179}
180#undef read
181#define read(a,b,c) read_wincon(a,b,c)
182
183/*
184 * write-wrapper to support writing to stdout and stderr on Windows.
185 */
186static ssize_t write_wincon(int fd, const void *buf, size_t count)
187{
188 HANDLE handle = NULL;
189 DWORD mode, wcount = 0;
190 BOOL success;
191
192 if(fd == fileno(stdout)) {
193 handle = GetStdHandle(STD_OUTPUT_HANDLE);
194 }
195 else if(fd == fileno(stderr)) {
196 handle = GetStdHandle(STD_ERROR_HANDLE);
197 }
198 else {
199 return write(fd, buf, count);
200 }
201
202 if(GetConsoleMode(handle, &mode)) {
203 success = WriteConsole(handle, buf, curlx_uztoul(count), &wcount, NULL);
204 }
205 else {
206 success = WriteFile(handle, buf, curlx_uztoul(count), &wcount, NULL);
207 }
208 if(success) {
209 return wcount;
210 }
211
212 errno = GetLastError();
213 return -1;
214}
215#undef write
216#define write(a,b,c) write_wincon(a,b,c)
217#endif
218
219/*
220 * fullread is a wrapper around the read() function. This will repeat the call
221 * to read() until it actually has read the complete number of bytes indicated
222 * in nbytes or it fails with a condition that cannot be handled with a simple
223 * retry of the read call.
224 */
225
226static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
227{
228 int error;
229 ssize_t nread = 0;
230
231 do {
232 ssize_t rc = read(filedes,
233 (unsigned char *)buffer + nread, nbytes - nread);
234
235 if(got_exit_signal) {
236 logmsg("signalled to die");
237 return -1;
238 }
239
240 if(rc < 0) {
241 error = errno;
242 if((error == EINTR) || (error == EAGAIN))
243 continue;
244 logmsg("reading from file descriptor: %d,", filedes);
245 logmsg("unrecoverable read() failure: (%d) %s",
246 error, strerror(error));
247 return -1;
248 }
249
250 if(rc == 0) {
251 logmsg("got 0 reading from stdin");
252 return 0;
253 }
254
255 nread += rc;
256
257 } while((size_t)nread < nbytes);
258
259 if(verbose)
260 logmsg("read %zd bytes", nread);
261
262 return nread;
263}
264
265/*
266 * fullwrite is a wrapper around the write() function. This will repeat the
267 * call to write() until it actually has written the complete number of bytes
268 * indicated in nbytes or it fails with a condition that cannot be handled
269 * with a simple retry of the write call.
270 */
271
272static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
273{
274 int error;
275 ssize_t nwrite = 0;
276
277 do {
278 ssize_t wc = write(filedes, (const unsigned char *)buffer + nwrite,
279 nbytes - nwrite);
280
281 if(got_exit_signal) {
282 logmsg("signalled to die");
283 return -1;
284 }
285
286 if(wc < 0) {
287 error = errno;
288 if((error == EINTR) || (error == EAGAIN))
289 continue;
290 logmsg("writing to file descriptor: %d,", filedes);
291 logmsg("unrecoverable write() failure: (%d) %s",
292 error, strerror(error));
293 return -1;
294 }
295
296 if(wc == 0) {
297 logmsg("put 0 writing to stdout");
298 return 0;
299 }
300
301 nwrite += wc;
302
303 } while((size_t)nwrite < nbytes);
304
305 if(verbose)
306 logmsg("wrote %zd bytes", nwrite);
307
308 return nwrite;
309}
310
311/*
312 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
313 * blocking function that will only return TRUE when nbytes have actually been
314 * read or FALSE when an unrecoverable error has been detected. Failure of this
315 * function is an indication that the sockfilt process should terminate.
316 */
317
318static bool read_stdin(void *buffer, size_t nbytes)
319{
320 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
321 if(nread != (ssize_t)nbytes) {
322 logmsg("exiting...");
323 return FALSE;
324 }
325 return TRUE;
326}
327
328/*
329 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
330 * blocking function that will only return TRUE when nbytes have actually been
331 * written or FALSE when an unrecoverable error has been detected. Failure of
332 * this function is an indication that the sockfilt process should terminate.
333 */
334
335static bool write_stdout(const void *buffer, size_t nbytes)
336{
337 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
338 if(nwrite != (ssize_t)nbytes) {
339 logmsg("exiting...");
340 return FALSE;
341 }
342 return TRUE;
343}
344
345static void lograw(unsigned char *buffer, ssize_t len)
346{
347 char data[120];
348 ssize_t i;
349 unsigned char *ptr = buffer;
350 char *optr = data;
351 ssize_t width = 0;
352 int left = sizeof(data);
353
354 for(i = 0; i<len; i++) {
355 switch(ptr[i]) {
356 case '\n':
357 msnprintf(optr, left, "\\n");
358 width += 2;
359 optr += 2;
360 left -= 2;
361 break;
362 case '\r':
363 msnprintf(optr, left, "\\r");
364 width += 2;
365 optr += 2;
366 left -= 2;
367 break;
368 default:
369 msnprintf(optr, left, "%c", (ISGRAPH(ptr[i]) ||
370 ptr[i] == 0x20) ?ptr[i]:'.');
371 width++;
372 optr++;
373 left--;
374 break;
375 }
376
377 if(width>60) {
378 logmsg("'%s'", data);
379 width = 0;
380 optr = data;
381 left = sizeof(data);
382 }
383 }
384 if(width)
385 logmsg("'%s'", data);
386}
387
388#ifdef USE_WINSOCK
389/*
390 * WinSock select() does not support standard file descriptors,
391 * it can only check SOCKETs. The following function is an attempt
392 * to re-create a select() function with support for other handle types.
393 *
394 * select() function with support for WINSOCK2 sockets and all
395 * other handle types supported by WaitForMultipleObjectsEx() as
396 * well as disk files, anonymous and names pipes, and character input.
397 *
398 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
399 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
400 */
401struct select_ws_wait_data {
402 HANDLE handle; /* actual handle to wait for during select */
403 HANDLE signal; /* internal event to signal handle trigger */
404 HANDLE abort; /* internal event to abort waiting thread */
405 HANDLE mutex; /* mutex to prevent event race-condition */
406};
407static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter)
408{
409 struct select_ws_wait_data *data;
410 HANDLE mutex, signal, handle, handles[2];
411 INPUT_RECORD inputrecord;
412 LARGE_INTEGER size, pos;
413 DWORD type, length, ret;
414
415 /* retrieve handles from internal structure */
416 data = (struct select_ws_wait_data *) lpParameter;
417 if(data) {
418 handle = data->handle;
419 handles[0] = data->abort;
420 handles[1] = handle;
421 signal = data->signal;
422 mutex = data->mutex;
423 free(data);
424 }
425 else
426 return (DWORD)-1;
427
428 /* retrieve the type of file to wait on */
429 type = GetFileType(handle);
430 switch(type) {
431 case FILE_TYPE_DISK:
432 /* The handle represents a file on disk, this means:
433 * - WaitForMultipleObjectsEx will always be signalled for it.
434 * - comparison of current position in file and total size of
435 * the file can be used to check if we reached the end yet.
436 *
437 * Approach: Loop till either the internal event is signalled
438 * or if the end of the file has already been reached.
439 */
440 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
441 == WAIT_TIMEOUT) {
442 ret = WaitForSingleObjectEx(mutex, 0, FALSE);
443 if(ret == WAIT_OBJECT_0) {
444 /* get total size of file */
445 length = 0;
446 size.QuadPart = 0;
447 size.LowPart = GetFileSize(handle, &length);
448 if((size.LowPart != INVALID_FILE_SIZE) ||
449 (GetLastError() == NO_ERROR)) {
450 size.HighPart = length;
451 /* get the current position within the file */
452 pos.QuadPart = 0;
453 pos.LowPart = SetFilePointer(handle, 0, &pos.HighPart,
454 FILE_CURRENT);
455 if((pos.LowPart != INVALID_SET_FILE_POINTER) ||
456 (GetLastError() == NO_ERROR)) {
457 /* compare position with size, abort if not equal */
458 if(size.QuadPart == pos.QuadPart) {
459 /* sleep and continue waiting */
460 SleepEx(0, FALSE);
461 ReleaseMutex(mutex);
462 continue;
463 }
464 }
465 }
466 /* there is some data available, stop waiting */
467 logmsg("[select_ws_wait_thread] data available, DISK: %p", handle);
468 SetEvent(signal);
469 ReleaseMutex(mutex);
470 break;
471 }
472 else if(ret == WAIT_ABANDONED) {
473 /* we are not allowed to process this event, because select_ws
474 is post-processing the signalled events and we must exit. */
475 break;
476 }
477 }
478 break;
479
480 case FILE_TYPE_CHAR:
481 /* The handle represents a character input, this means:
482 * - WaitForMultipleObjectsEx will be signalled on any kind of input,
483 * including mouse and window size events we do not care about.
484 *
485 * Approach: Loop till either the internal event is signalled
486 * or we get signalled for an actual key-event.
487 */
488 while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
489 == WAIT_OBJECT_0 + 1) {
490 ret = WaitForSingleObjectEx(mutex, 0, FALSE);
491 if(ret == WAIT_OBJECT_0) {
492 /* check if this is an actual console handle */
493 if(GetConsoleMode(handle, &ret)) {
494 /* retrieve an event from the console buffer */
495 length = 0;
496 if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
497 /* check if the event is not an actual key-event */
498 if(length == 1 && inputrecord.EventType != KEY_EVENT) {
499 /* purge the non-key-event and continue waiting */
500 ReadConsoleInput(handle, &inputrecord, 1, &length);
501 ReleaseMutex(mutex);
502 continue;
503 }
504 }
505 }
506 /* there is some data available, stop waiting */
507 logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle);
508 SetEvent(signal);
509 ReleaseMutex(mutex);
510 break;
511 }
512 else if(ret == WAIT_ABANDONED) {
513 /* we are not allowed to process this event, because select_ws
514 is post-processing the signalled events and we must exit. */
515 break;
516 }
517 }
518 break;
519
520 case FILE_TYPE_PIPE:
521 /* The handle represents an anonymous or named pipe, this means:
522 * - WaitForMultipleObjectsEx will always be signalled for it.
523 * - peek into the pipe and retrieve the amount of data available.
524 *
525 * Approach: Loop till either the internal event is signalled
526 * or there is data in the pipe available for reading.
527 */
528 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
529 == WAIT_TIMEOUT) {
530 ret = WaitForSingleObjectEx(mutex, 0, FALSE);
531 if(ret == WAIT_OBJECT_0) {
532 /* peek into the pipe and retrieve the amount of data available */
533 length = 0;
534 if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
535 /* if there is no data available, sleep and continue waiting */
536 if(length == 0) {
537 SleepEx(0, FALSE);
538 ReleaseMutex(mutex);
539 continue;
540 }
541 else {
542 logmsg("[select_ws_wait_thread] PeekNamedPipe len: %d", length);
543 }
544 }
545 else {
546 /* if the pipe has NOT been closed, sleep and continue waiting */
547 ret = GetLastError();
548 if(ret != ERROR_BROKEN_PIPE) {
549 logmsg("[select_ws_wait_thread] PeekNamedPipe error: %d", ret);
550 SleepEx(0, FALSE);
551 ReleaseMutex(mutex);
552 continue;
553 }
554 else {
555 logmsg("[select_ws_wait_thread] pipe closed, PIPE: %p", handle);
556 }
557 }
558 /* there is some data available, stop waiting */
559 logmsg("[select_ws_wait_thread] data available, PIPE: %p", handle);
560 SetEvent(signal);
561 ReleaseMutex(mutex);
562 break;
563 }
564 else if(ret == WAIT_ABANDONED) {
565 /* we are not allowed to process this event, because select_ws
566 is post-processing the signalled events and we must exit. */
567 break;
568 }
569 }
570 break;
571
572 default:
573 /* The handle has an unknown type, try to wait on it */
574 if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
575 == WAIT_OBJECT_0 + 1) {
576 if(WaitForSingleObjectEx(mutex, 0, FALSE) == WAIT_OBJECT_0) {
577 logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle);
578 SetEvent(signal);
579 ReleaseMutex(mutex);
580 }
581 }
582 break;
583 }
584
585 return 0;
586}
587static HANDLE select_ws_wait(HANDLE handle, HANDLE signal,
588 HANDLE abort, HANDLE mutex)
589{
590 struct select_ws_wait_data *data;
591 HANDLE thread = NULL;
592
593 /* allocate internal waiting data structure */
594 data = malloc(sizeof(struct select_ws_wait_data));
595 if(data) {
596 data->handle = handle;
597 data->signal = signal;
598 data->abort = abort;
599 data->mutex = mutex;
600
601 /* launch waiting thread */
602 thread = CreateThread(NULL, 0,
603 &select_ws_wait_thread,
604 data, 0, NULL);
605
606 /* free data if thread failed to launch */
607 if(!thread) {
608 free(data);
609 }
610 }
611
612 return thread;
613}
614struct select_ws_data {
615 int fd; /* provided file descriptor (indexed by nfd) */
616 long wsastate; /* internal pre-select state (indexed by nfd) */
617 curl_socket_t wsasock; /* internal socket handle (indexed by nws) */
618 WSAEVENT wsaevent; /* internal select event (indexed by nws) */
619 HANDLE signal; /* internal thread signal (indexed by nth) */
620 HANDLE thread; /* internal thread handle (indexed by nth) */
621};
622static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
623 fd_set *exceptfds, struct timeval *tv)
624{
625 HANDLE abort, mutex, signal, handle, *handles;
626 DWORD timeout_ms, wait, nfd, nth, nws, i;
627 fd_set readsock, writesock, exceptsock;
628 struct select_ws_data *data;
629 WSANETWORKEVENTS wsaevents;
630 curl_socket_t wsasock;
631 int error, ret, fd;
632 WSAEVENT wsaevent;
633
634 /* check if the input value is valid */
635 if(nfds < 0) {
636 errno = EINVAL;
637 return -1;
638 }
639
640 /* convert struct timeval to milliseconds */
641 if(tv) {
642 timeout_ms = (tv->tv_sec*1000) + (DWORD)(((double)tv->tv_usec)/1000.0);
643 }
644 else {
645 timeout_ms = INFINITE;
646 }
647
648 /* check if we got descriptors, sleep in case we got none */
649 if(!nfds) {
650 SleepEx(timeout_ms, FALSE);
651 return 0;
652 }
653
654 /* create internal event to abort waiting threads */
655 abort = CreateEvent(NULL, TRUE, FALSE, NULL);
656 if(!abort) {
657 errno = ENOMEM;
658 return -1;
659 }
660
661 /* create internal mutex to lock event handling in threads */
662 mutex = CreateMutex(NULL, FALSE, NULL);
663 if(!mutex) {
664 CloseHandle(abort);
665 errno = ENOMEM;
666 return -1;
667 }
668
669 /* allocate internal array for the internal data */
670 data = calloc(nfds, sizeof(struct select_ws_data));
671 if(!data) {
672 CloseHandle(abort);
673 CloseHandle(mutex);
674 errno = ENOMEM;
675 return -1;
676 }
677
678 /* allocate internal array for the internal event handles */
679 handles = calloc(nfds + 1, sizeof(HANDLE));
680 if(!handles) {
681 CloseHandle(abort);
682 CloseHandle(mutex);
683 free(data);
684 errno = ENOMEM;
685 return -1;
686 }
687
688 /* loop over the handles in the input descriptor sets */
689 nfd = 0; /* number of handled file descriptors */
690 nth = 0; /* number of internal waiting threads */
691 nws = 0; /* number of handled WINSOCK sockets */
692 for(fd = 0; fd < nfds; fd++) {
693 wsasock = curlx_sitosk(fd);
694 wsaevents.lNetworkEvents = 0;
695 handles[nfd] = 0;
696
697 FD_ZERO(&readsock);
698 FD_ZERO(&writesock);
699 FD_ZERO(&exceptsock);
700
701 if(FD_ISSET(wsasock, readfds)) {
702 FD_SET(wsasock, &readsock);
703 wsaevents.lNetworkEvents |= FD_READ|FD_ACCEPT|FD_CLOSE;
704 }
705
706 if(FD_ISSET(wsasock, writefds)) {
707 FD_SET(wsasock, &writesock);
708 wsaevents.lNetworkEvents |= FD_WRITE|FD_CONNECT|FD_CLOSE;
709 }
710
711 if(FD_ISSET(wsasock, exceptfds)) {
712 FD_SET(wsasock, &exceptsock);
713 wsaevents.lNetworkEvents |= FD_OOB;
714 }
715
716 /* only wait for events for which we actually care */
717 if(wsaevents.lNetworkEvents) {
718 data[nfd].fd = fd;
719 if(fd == fileno(stdin)) {
720 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
721 if(signal) {
722 handle = GetStdHandle(STD_INPUT_HANDLE);
723 handle = select_ws_wait(handle, signal, abort, mutex);
724 if(handle) {
725 handles[nfd] = signal;
726 data[nth].signal = signal;
727 data[nth].thread = handle;
728 nfd++;
729 nth++;
730 }
731 else {
732 CloseHandle(signal);
733 }
734 }
735 }
736 else if(fd == fileno(stdout)) {
737 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
738 nfd++;
739 }
740 else if(fd == fileno(stderr)) {
741 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
742 nfd++;
743 }
744 else {
745 wsaevent = WSACreateEvent();
746 if(wsaevent != WSA_INVALID_EVENT) {
747 if(wsaevents.lNetworkEvents & FD_WRITE) {
748 send(wsasock, NULL, 0, 0); /* reset FD_WRITE */
749 }
750 error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
751 if(error != SOCKET_ERROR) {
752 handles[nfd] = (HANDLE)wsaevent;
753 data[nws].wsasock = wsasock;
754 data[nws].wsaevent = wsaevent;
755 data[nfd].wsastate = 0;
756 tv->tv_sec = 0;
757 tv->tv_usec = 0;
758 /* check if the socket is already ready */
759 if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
760 logmsg("[select_ws] socket %d is ready", fd);
761 WSASetEvent(wsaevent);
762 if(FD_ISSET(wsasock, &readsock))
763 data[nfd].wsastate |= FD_READ;
764 if(FD_ISSET(wsasock, &writesock))
765 data[nfd].wsastate |= FD_WRITE;
766 if(FD_ISSET(wsasock, &exceptsock))
767 data[nfd].wsastate |= FD_OOB;
768 }
769 nfd++;
770 nws++;
771 }
772 else {
773 WSACloseEvent(wsaevent);
774 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
775 if(signal) {
776 handle = (HANDLE)wsasock;
777 handle = select_ws_wait(handle, signal, abort, mutex);
778 if(handle) {
779 handles[nfd] = signal;
780 data[nth].signal = signal;
781 data[nth].thread = handle;
782 nfd++;
783 nth++;
784 }
785 else {
786 CloseHandle(signal);
787 }
788 }
789 }
790 }
791 }
792 }
793 }
794
795 /* wait on the number of handles */
796 wait = nfd;
797
798 /* make sure we stop waiting on exit signal event */
799 if(exit_event) {
800 /* we allocated handles nfds + 1 for this */
801 handles[nfd] = exit_event;
802 wait += 1;
803 }
804
805 /* wait for one of the internal handles to trigger */
806 wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
807
808 /* wait for internal mutex to lock event handling in threads */
809 WaitForSingleObjectEx(mutex, INFINITE, FALSE);
810
811 /* loop over the internal handles returned in the descriptors */
812 ret = 0; /* number of ready file descriptors */
813 for(i = 0; i < nfd; i++) {
814 fd = data[i].fd;
815 handle = handles[i];
816 wsasock = curlx_sitosk(fd);
817
818 /* check if the current internal handle was triggered */
819 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
820 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
821 /* first handle stdin, stdout and stderr */
822 if(fd == fileno(stdin)) {
823 /* stdin is never ready for write or exceptional */
824 FD_CLR(wsasock, writefds);
825 FD_CLR(wsasock, exceptfds);
826 }
827 else if(fd == fileno(stdout) || fd == fileno(stderr)) {
828 /* stdout and stderr are never ready for read or exceptional */
829 FD_CLR(wsasock, readfds);
830 FD_CLR(wsasock, exceptfds);
831 }
832 else {
833 /* try to handle the event with the WINSOCK2 functions */
834 wsaevents.lNetworkEvents = 0;
835 error = WSAEnumNetworkEvents(wsasock, handle, &wsaevents);
836 if(error != SOCKET_ERROR) {
837 /* merge result from pre-check using select */
838 wsaevents.lNetworkEvents |= data[i].wsastate;
839
840 /* remove from descriptor set if not ready for read/accept/close */
841 if(!(wsaevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
842 FD_CLR(wsasock, readfds);
843
844 /* remove from descriptor set if not ready for write/connect */
845 if(!(wsaevents.lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE)))
846 FD_CLR(wsasock, writefds);
847
848 /* remove from descriptor set if not exceptional */
849 if(!(wsaevents.lNetworkEvents & FD_OOB))
850 FD_CLR(wsasock, exceptfds);
851 }
852 }
853
854 /* check if the event has not been filtered using specific tests */
855 if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
856 FD_ISSET(wsasock, exceptfds)) {
857 ret++;
858 }
859 }
860 else {
861 /* remove from all descriptor sets since this handle did not trigger */
862 FD_CLR(wsasock, readfds);
863 FD_CLR(wsasock, writefds);
864 FD_CLR(wsasock, exceptfds);
865 }
866 }
867
868 /* signal the event handle for the other waiting threads */
869 SetEvent(abort);
870
871 for(fd = 0; fd < nfds; fd++) {
872 if(FD_ISSET(fd, readfds))
873 logmsg("[select_ws] %d is readable", fd);
874 if(FD_ISSET(fd, writefds))
875 logmsg("[select_ws] %d is writable", fd);
876 if(FD_ISSET(fd, exceptfds))
877 logmsg("[select_ws] %d is exceptional", fd);
878 }
879
880 for(i = 0; i < nws; i++) {
881 WSAEventSelect(data[i].wsasock, NULL, 0);
882 WSACloseEvent(data[i].wsaevent);
883 }
884
885 for(i = 0; i < nth; i++) {
886 WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
887 CloseHandle(data[i].thread);
888 CloseHandle(data[i].signal);
889 }
890
891 CloseHandle(abort);
892 CloseHandle(mutex);
893
894 free(handles);
895 free(data);
896
897 return ret;
898}
899#define select(a,b,c,d,e) select_ws(a,b,c,d,e)
900#endif /* USE_WINSOCK */
901
902/*
903 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
904
905 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
906 accept()
907*/
908static bool juggle(curl_socket_t *sockfdp,
909 curl_socket_t listenfd,
910 enum sockmode *mode)
911{
912 struct timeval timeout;
913 fd_set fds_read;
914 fd_set fds_write;
915 fd_set fds_err;
916 curl_socket_t sockfd = CURL_SOCKET_BAD;
917 int maxfd = -99;
918 ssize_t rc;
919 int error = 0;
920
921 /* 'buffer' is this excessively large only to be able to support things like
922 test 1003 which tests exceedingly large server response lines */
923 unsigned char buffer[17010];
924 char data[16];
925
926 if(got_exit_signal) {
927 logmsg("signalled to die, exiting...");
928 return FALSE;
929 }
930
931#ifdef HAVE_GETPPID
932 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
933 parent ftpserver process has died without killing its sockfilt children */
934 if(getppid() <= 1) {
935 logmsg("process becomes orphan, exiting");
936 return FALSE;
937 }
938#endif
939
940 timeout.tv_sec = 120;
941 timeout.tv_usec = 0;
942
943 FD_ZERO(&fds_read);
944 FD_ZERO(&fds_write);
945 FD_ZERO(&fds_err);
946
947 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
948
949 switch(*mode) {
950
951 case PASSIVE_LISTEN:
952
953 /* server mode */
954 sockfd = listenfd;
955 /* there's always a socket to wait for */
956 FD_SET(sockfd, &fds_read);
957 maxfd = (int)sockfd;
958 break;
959
960 case PASSIVE_CONNECT:
961
962 sockfd = *sockfdp;
963 if(CURL_SOCKET_BAD == sockfd) {
964 /* eeek, we are supposedly connected and then this cannot be -1 ! */
965 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
966 maxfd = 0; /* stdin */
967 }
968 else {
969 /* there's always a socket to wait for */
970 FD_SET(sockfd, &fds_read);
971 maxfd = (int)sockfd;
972 }
973 break;
974
975 case ACTIVE:
976
977 sockfd = *sockfdp;
978 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
979 if(CURL_SOCKET_BAD != sockfd) {
980 FD_SET(sockfd, &fds_read);
981 maxfd = (int)sockfd;
982 }
983 else {
984 logmsg("No socket to read on");
985 maxfd = 0;
986 }
987 break;
988
989 case ACTIVE_DISCONNECT:
990
991 logmsg("disconnected, no socket to read on");
992 maxfd = 0;
993 sockfd = CURL_SOCKET_BAD;
994 break;
995
996 } /* switch(*mode) */
997
998
999 do {
1000
1001 /* select() blocking behavior call on blocking descriptors please */
1002
1003 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
1004
1005 if(got_exit_signal) {
1006 logmsg("signalled to die, exiting...");
1007 return FALSE;
1008 }
1009
1010 } while((rc == -1) && ((error = errno) == EINTR));
1011
1012 if(rc < 0) {
1013 logmsg("select() failed with error: (%d) %s",
1014 error, strerror(error));
1015 return FALSE;
1016 }
1017
1018 if(rc == 0)
1019 /* timeout */
1020 return TRUE;
1021
1022
1023 if(FD_ISSET(fileno(stdin), &fds_read)) {
1024 ssize_t buffer_len;
1025 /* read from stdin, commands/data to be dealt with and possibly passed on
1026 to the socket
1027
1028 protocol:
1029
1030 4 letter command + LF [mandatory]
1031
1032 4-digit hexadecimal data length + LF [if the command takes data]
1033 data [the data being as long as set above]
1034
1035 Commands:
1036
1037 DATA - plain pass-through data
1038 */
1039
1040 if(!read_stdin(buffer, 5))
1041 return FALSE;
1042
1043 logmsg("Received %c%c%c%c (on stdin)",
1044 buffer[0], buffer[1], buffer[2], buffer[3]);
1045
1046 if(!memcmp("PING", buffer, 4)) {
1047 /* send reply on stdout, just proving we are alive */
1048 if(!write_stdout("PONG\n", 5))
1049 return FALSE;
1050 }
1051
1052 else if(!memcmp("PORT", buffer, 4)) {
1053 /* Question asking us what PORT number we are listening to.
1054 Replies to PORT with "IPv[num]/[port]" */
1055 msnprintf((char *)buffer, sizeof(buffer), "%s/%hu\n", ipv_inuse, port);
1056 buffer_len = (ssize_t)strlen((char *)buffer);
1057 msnprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
1058 if(!write_stdout(data, 10))
1059 return FALSE;
1060 if(!write_stdout(buffer, buffer_len))
1061 return FALSE;
1062 }
1063 else if(!memcmp("QUIT", buffer, 4)) {
1064 /* just die */
1065 logmsg("quits");
1066 return FALSE;
1067 }
1068 else if(!memcmp("DATA", buffer, 4)) {
1069 /* data IN => data OUT */
1070
1071 if(!read_stdin(buffer, 5))
1072 return FALSE;
1073
1074 buffer[5] = '\0';
1075
1076 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
1077 if(buffer_len > (ssize_t)sizeof(buffer)) {
1078 logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
1079 "(%zd bytes)", sizeof(buffer), buffer_len);
1080 return FALSE;
1081 }
1082 logmsg("> %zd bytes data, server => client", buffer_len);
1083
1084 if(!read_stdin(buffer, buffer_len))
1085 return FALSE;
1086
1087 lograw(buffer, buffer_len);
1088
1089 if(*mode == PASSIVE_LISTEN) {
1090 logmsg("*** We are disconnected!");
1091 if(!write_stdout("DISC\n", 5))
1092 return FALSE;
1093 }
1094 else {
1095 /* send away on the socket */
1096 ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
1097 if(bytes_written != buffer_len) {
1098 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
1099 buffer_len, bytes_written);
1100 }
1101 }
1102 }
1103 else if(!memcmp("DISC", buffer, 4)) {
1104 /* disconnect! */
1105 if(!write_stdout("DISC\n", 5))
1106 return FALSE;
1107 if(sockfd != CURL_SOCKET_BAD) {
1108 logmsg("====> Client forcibly disconnected");
1109 sclose(sockfd);
1110 *sockfdp = CURL_SOCKET_BAD;
1111 if(*mode == PASSIVE_CONNECT)
1112 *mode = PASSIVE_LISTEN;
1113 else
1114 *mode = ACTIVE_DISCONNECT;
1115 }
1116 else
1117 logmsg("attempt to close already dead connection");
1118 return TRUE;
1119 }
1120 }
1121
1122
1123 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
1124 ssize_t nread_socket;
1125 if(*mode == PASSIVE_LISTEN) {
1126 /* there's no stream set up yet, this is an indication that there's a
1127 client connecting. */
1128 curl_socket_t newfd = accept(sockfd, NULL, NULL);
1129 if(CURL_SOCKET_BAD == newfd) {
1130 error = SOCKERRNO;
1131 logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
1132 sockfd, error, strerror(error));
1133 }
1134 else {
1135 logmsg("====> Client connect");
1136 if(!write_stdout("CNCT\n", 5))
1137 return FALSE;
1138 *sockfdp = newfd; /* store the new socket */
1139 *mode = PASSIVE_CONNECT; /* we have connected */
1140 }
1141 return TRUE;
1142 }
1143
1144 /* read from socket, pass on data to stdout */
1145 nread_socket = sread(sockfd, buffer, sizeof(buffer));
1146
1147 if(nread_socket > 0) {
1148 msnprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
1149 if(!write_stdout(data, 10))
1150 return FALSE;
1151 if(!write_stdout(buffer, nread_socket))
1152 return FALSE;
1153
1154 logmsg("< %zd bytes data, client => server", nread_socket);
1155 lograw(buffer, nread_socket);
1156 }
1157
1158 if(nread_socket <= 0) {
1159 logmsg("====> Client disconnect");
1160 if(!write_stdout("DISC\n", 5))
1161 return FALSE;
1162 sclose(sockfd);
1163 *sockfdp = CURL_SOCKET_BAD;
1164 if(*mode == PASSIVE_CONNECT)
1165 *mode = PASSIVE_LISTEN;
1166 else
1167 *mode = ACTIVE_DISCONNECT;
1168 return TRUE;
1169 }
1170 }
1171
1172 return TRUE;
1173}
1174
1175static curl_socket_t sockdaemon(curl_socket_t sock,
1176 unsigned short *listenport)
1177{
1178 /* passive daemon style */
1179 srvr_sockaddr_union_t listener;
1180 int flag;
1181 int rc;
1182 int totdelay = 0;
1183 int maxretr = 10;
1184 int delay = 20;
1185 int attempt = 0;
1186 int error = 0;
1187
1188 do {
1189 attempt++;
1190 flag = 1;
1191 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1192 (void *)&flag, sizeof(flag));
1193 if(rc) {
1194 error = SOCKERRNO;
1195 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
1196 error, strerror(error));
1197 if(maxretr) {
1198 rc = wait_ms(delay);
1199 if(rc) {
1200 /* should not happen */
1201 error = errno;
1202 logmsg("wait_ms() failed with error: (%d) %s",
1203 error, strerror(error));
1204 sclose(sock);
1205 return CURL_SOCKET_BAD;
1206 }
1207 if(got_exit_signal) {
1208 logmsg("signalled to die, exiting...");
1209 sclose(sock);
1210 return CURL_SOCKET_BAD;
1211 }
1212 totdelay += delay;
1213 delay *= 2; /* double the sleep for next attempt */
1214 }
1215 }
1216 } while(rc && maxretr--);
1217
1218 if(rc) {
1219 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
1220 attempt, totdelay, error, strerror(error));
1221 logmsg("Continuing anyway...");
1222 }
1223
1224 /* When the specified listener port is zero, it is actually a
1225 request to let the system choose a non-zero available port. */
1226
1227#ifdef ENABLE_IPV6
1228 if(!use_ipv6) {
1229#endif
1230 memset(&listener.sa4, 0, sizeof(listener.sa4));
1231 listener.sa4.sin_family = AF_INET;
1232 listener.sa4.sin_addr.s_addr = INADDR_ANY;
1233 listener.sa4.sin_port = htons(*listenport);
1234 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
1235#ifdef ENABLE_IPV6
1236 }
1237 else {
1238 memset(&listener.sa6, 0, sizeof(listener.sa6));
1239 listener.sa6.sin6_family = AF_INET6;
1240 listener.sa6.sin6_addr = in6addr_any;
1241 listener.sa6.sin6_port = htons(*listenport);
1242 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1243 }
1244#endif /* ENABLE_IPV6 */
1245 if(rc) {
1246 error = SOCKERRNO;
1247 logmsg("Error binding socket on port %hu: (%d) %s",
1248 *listenport, error, strerror(error));
1249 sclose(sock);
1250 return CURL_SOCKET_BAD;
1251 }
1252
1253 if(!*listenport) {
1254 /* The system was supposed to choose a port number, figure out which
1255 port we actually got and update the listener port value with it. */
1256 curl_socklen_t la_size;
1257 srvr_sockaddr_union_t localaddr;
1258#ifdef ENABLE_IPV6
1259 if(!use_ipv6)
1260#endif
1261 la_size = sizeof(localaddr.sa4);
1262#ifdef ENABLE_IPV6
1263 else
1264 la_size = sizeof(localaddr.sa6);
1265#endif
1266 memset(&localaddr.sa, 0, (size_t)la_size);
1267 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1268 error = SOCKERRNO;
1269 logmsg("getsockname() failed with error: (%d) %s",
1270 error, strerror(error));
1271 sclose(sock);
1272 return CURL_SOCKET_BAD;
1273 }
1274 switch(localaddr.sa.sa_family) {
1275 case AF_INET:
1276 *listenport = ntohs(localaddr.sa4.sin_port);
1277 break;
1278#ifdef ENABLE_IPV6
1279 case AF_INET6:
1280 *listenport = ntohs(localaddr.sa6.sin6_port);
1281 break;
1282#endif
1283 default:
1284 break;
1285 }
1286 if(!*listenport) {
1287 /* Real failure, listener port shall not be zero beyond this point. */
1288 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1289 logmsg("A valid reason for this failure is a binary built without");
1290 logmsg("proper network library linkage. This might not be the only");
1291 logmsg("reason, but double check it before anything else.");
1292 sclose(sock);
1293 return CURL_SOCKET_BAD;
1294 }
1295 }
1296
1297 /* bindonly option forces no listening */
1298 if(bind_only) {
1299 logmsg("instructed to bind port without listening");
1300 return sock;
1301 }
1302
1303 /* start accepting connections */
1304 rc = listen(sock, 5);
1305 if(0 != rc) {
1306 error = SOCKERRNO;
1307 logmsg("listen(%d, 5) failed with error: (%d) %s",
1308 sock, error, strerror(error));
1309 sclose(sock);
1310 return CURL_SOCKET_BAD;
1311 }
1312
1313 return sock;
1314}
1315
1316
1317int main(int argc, char *argv[])
1318{
1319 srvr_sockaddr_union_t me;
1320 curl_socket_t sock = CURL_SOCKET_BAD;
1321 curl_socket_t msgsock = CURL_SOCKET_BAD;
1322 int wrotepidfile = 0;
1323 int wroteportfile = 0;
1324 const char *pidname = ".sockfilt.pid";
1325 const char *portname = NULL; /* none by default */
1326 bool juggle_again;
1327 int rc;
1328 int error;
1329 int arg = 1;
1330 enum sockmode mode = PASSIVE_LISTEN; /* default */
1331 const char *addr = NULL;
1332
1333 while(argc>arg) {
1334 if(!strcmp("--version", argv[arg])) {
1335 printf("sockfilt IPv4%s\n",
1336#ifdef ENABLE_IPV6
1337 "/IPv6"
1338#else
1339 ""
1340#endif
1341 );
1342 return 0;
1343 }
1344 else if(!strcmp("--verbose", argv[arg])) {
1345 verbose = TRUE;
1346 arg++;
1347 }
1348 else if(!strcmp("--pidfile", argv[arg])) {
1349 arg++;
1350 if(argc>arg)
1351 pidname = argv[arg++];
1352 }
1353 else if(!strcmp("--portfile", argv[arg])) {
1354 arg++;
1355 if(argc > arg)
1356 portname = argv[arg++];
1357 }
1358 else if(!strcmp("--logfile", argv[arg])) {
1359 arg++;
1360 if(argc>arg)
1361 serverlogfile = argv[arg++];
1362 }
1363 else if(!strcmp("--ipv6", argv[arg])) {
1364#ifdef ENABLE_IPV6
1365 ipv_inuse = "IPv6";
1366 use_ipv6 = TRUE;
1367#endif
1368 arg++;
1369 }
1370 else if(!strcmp("--ipv4", argv[arg])) {
1371 /* for completeness, we support this option as well */
1372#ifdef ENABLE_IPV6
1373 ipv_inuse = "IPv4";
1374 use_ipv6 = FALSE;
1375#endif
1376 arg++;
1377 }
1378 else if(!strcmp("--bindonly", argv[arg])) {
1379 bind_only = TRUE;
1380 arg++;
1381 }
1382 else if(!strcmp("--port", argv[arg])) {
1383 arg++;
1384 if(argc>arg) {
1385 char *endptr;
1386 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1387 port = curlx_ultous(ulnum);
1388 arg++;
1389 }
1390 }
1391 else if(!strcmp("--connect", argv[arg])) {
1392 /* Asked to actively connect to the specified local port instead of
1393 doing a passive server-style listening. */
1394 arg++;
1395 if(argc>arg) {
1396 char *endptr;
1397 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1398 if((endptr != argv[arg] + strlen(argv[arg])) ||
1399 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1400 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1401 argv[arg]);
1402 return 0;
1403 }
1404 connectport = curlx_ultous(ulnum);
1405 arg++;
1406 }
1407 }
1408 else if(!strcmp("--addr", argv[arg])) {
1409 /* Set an IP address to use with --connect; otherwise use localhost */
1410 arg++;
1411 if(argc>arg) {
1412 addr = argv[arg];
1413 arg++;
1414 }
1415 }
1416 else {
1417 puts("Usage: sockfilt [option]\n"
1418 " --version\n"
1419 " --verbose\n"
1420 " --logfile [file]\n"
1421 " --pidfile [file]\n"
1422 " --portfile [file]\n"
1423 " --ipv4\n"
1424 " --ipv6\n"
1425 " --bindonly\n"
1426 " --port [port]\n"
1427 " --connect [port]\n"
1428 " --addr [address]");
1429 return 0;
1430 }
1431 }
1432
1433#ifdef WIN32
1434 win32_init();
1435 atexit(win32_cleanup);
1436
1437 setmode(fileno(stdin), O_BINARY);
1438 setmode(fileno(stdout), O_BINARY);
1439 setmode(fileno(stderr), O_BINARY);
1440#endif
1441
1442 install_signal_handlers(false);
1443
1444#ifdef ENABLE_IPV6
1445 if(!use_ipv6)
1446#endif
1447 sock = socket(AF_INET, SOCK_STREAM, 0);
1448#ifdef ENABLE_IPV6
1449 else
1450 sock = socket(AF_INET6, SOCK_STREAM, 0);
1451#endif
1452
1453 if(CURL_SOCKET_BAD == sock) {
1454 error = SOCKERRNO;
1455 logmsg("Error creating socket: (%d) %s",
1456 error, strerror(error));
1457 write_stdout("FAIL\n", 5);
1458 goto sockfilt_cleanup;
1459 }
1460
1461 if(connectport) {
1462 /* Active mode, we should connect to the given port number */
1463 mode = ACTIVE;
1464#ifdef ENABLE_IPV6
1465 if(!use_ipv6) {
1466#endif
1467 memset(&me.sa4, 0, sizeof(me.sa4));
1468 me.sa4.sin_family = AF_INET;
1469 me.sa4.sin_port = htons(connectport);
1470 me.sa4.sin_addr.s_addr = INADDR_ANY;
1471 if(!addr)
1472 addr = "127.0.0.1";
1473 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1474
1475 rc = connect(sock, &me.sa, sizeof(me.sa4));
1476#ifdef ENABLE_IPV6
1477 }
1478 else {
1479 memset(&me.sa6, 0, sizeof(me.sa6));
1480 me.sa6.sin6_family = AF_INET6;
1481 me.sa6.sin6_port = htons(connectport);
1482 if(!addr)
1483 addr = "::1";
1484 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1485
1486 rc = connect(sock, &me.sa, sizeof(me.sa6));
1487 }
1488#endif /* ENABLE_IPV6 */
1489 if(rc) {
1490 error = SOCKERRNO;
1491 logmsg("Error connecting to port %hu: (%d) %s",
1492 connectport, error, strerror(error));
1493 write_stdout("FAIL\n", 5);
1494 goto sockfilt_cleanup;
1495 }
1496 logmsg("====> Client connect");
1497 msgsock = sock; /* use this as stream */
1498 }
1499 else {
1500 /* passive daemon style */
1501 sock = sockdaemon(sock, &port);
1502 if(CURL_SOCKET_BAD == sock) {
1503 write_stdout("FAIL\n", 5);
1504 goto sockfilt_cleanup;
1505 }
1506 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1507 }
1508
1509 logmsg("Running %s version", ipv_inuse);
1510
1511 if(connectport)
1512 logmsg("Connected to port %hu", connectport);
1513 else if(bind_only)
1514 logmsg("Bound without listening on port %hu", port);
1515 else
1516 logmsg("Listening on port %hu", port);
1517
1518 wrotepidfile = write_pidfile(pidname);
1519 if(!wrotepidfile) {
1520 write_stdout("FAIL\n", 5);
1521 goto sockfilt_cleanup;
1522 }
1523 if(portname) {
1524 wroteportfile = write_portfile(portname, port);
1525 if(!wroteportfile) {
1526 write_stdout("FAIL\n", 5);
1527 goto sockfilt_cleanup;
1528 }
1529 }
1530
1531 do {
1532 juggle_again = juggle(&msgsock, sock, &mode);
1533 } while(juggle_again);
1534
1535sockfilt_cleanup:
1536
1537 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1538 sclose(msgsock);
1539
1540 if(sock != CURL_SOCKET_BAD)
1541 sclose(sock);
1542
1543 if(wrotepidfile)
1544 unlink(pidname);
1545 if(wroteportfile)
1546 unlink(portname);
1547
1548 restore_signal_handlers(false);
1549
1550 if(got_exit_signal) {
1551 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1552 /*
1553 * To properly set the return status of the process we
1554 * must raise the same signal SIGINT or SIGTERM that we
1555 * caught and let the old handler take care of it.
1556 */
1557 raise(exit_signal);
1558 }
1559
1560 logmsg("============> sockfilt quits");
1561 return 0;
1562}
1563