1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2020, 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.haxx.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
132 const char *serverlogfile = DEFAULT_LOGFILE;
133
134 static bool verbose = FALSE;
135 static bool bind_only = FALSE;
136 #ifdef ENABLE_IPV6
137 static bool use_ipv6 = FALSE;
138 #endif
139 static const char *ipv_inuse = "IPv4";
140 static unsigned short port = DEFAULT_PORT;
141 static unsigned short connectport = 0; /* if non-zero, we activate this mode */
142
143 enum 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 */
read_wincon(int fd,void * buf,size_t count)154 static 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 */
write_wincon(int fd,const void * buf,size_t count)186 static 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
fullread(int filedes,void * buffer,size_t nbytes)226 static 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
fullwrite(int filedes,const void * buffer,size_t nbytes)272 static 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
read_stdin(void * buffer,size_t nbytes)318 static 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
write_stdout(const void * buffer,size_t nbytes)335 static 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
lograw(unsigned char * buffer,ssize_t len)345 static 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 */
401 struct 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 };
select_ws_wait_thread(LPVOID lpParameter)407 static 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 }
select_ws_wait(HANDLE handle,HANDLE signal,HANDLE abort,HANDLE mutex)587 static 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 }
614 struct 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 };
select_ws(int nfds,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct timeval * tv)622 static 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 == NULL) {
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 == NULL) {
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 nth++;
729 }
730 else {
731 CloseHandle(signal);
732 }
733 }
734 }
735 else if(fd == fileno(stdout)) {
736 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
737 }
738 else if(fd == fileno(stderr)) {
739 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
740 }
741 else {
742 wsaevent = WSACreateEvent();
743 if(wsaevent != WSA_INVALID_EVENT) {
744 error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
745 if(error != SOCKET_ERROR) {
746 handles[nfd] = (HANDLE)wsaevent;
747 data[nws].wsasock = wsasock;
748 data[nws].wsaevent = wsaevent;
749 data[nfd].wsastate = 0;
750 tv->tv_sec = 0;
751 tv->tv_usec = 0;
752 /* check if the socket is already ready */
753 if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
754 logmsg("[select_ws] socket %d is ready", fd);
755 WSASetEvent(wsaevent);
756 if(FD_ISSET(wsasock, &readsock))
757 data[nfd].wsastate |= FD_READ;
758 if(FD_ISSET(wsasock, &writesock))
759 data[nfd].wsastate |= FD_WRITE;
760 if(FD_ISSET(wsasock, &exceptsock))
761 data[nfd].wsastate |= FD_OOB;
762 }
763 nws++;
764 }
765 else {
766 WSACloseEvent(wsaevent);
767 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
768 if(signal) {
769 handle = (HANDLE)wsasock;
770 handle = select_ws_wait(handle, signal, abort, mutex);
771 if(handle) {
772 handles[nfd] = signal;
773 data[nth].signal = signal;
774 data[nth].thread = handle;
775 nth++;
776 }
777 else {
778 CloseHandle(signal);
779 }
780 }
781 }
782 }
783 }
784 nfd++;
785 }
786 }
787
788 /* wait on the number of handles */
789 wait = nfd;
790
791 /* make sure we stop waiting on exit signal event */
792 if(exit_event) {
793 /* we allocated handles nfds + 1 for this */
794 handles[nfd] = exit_event;
795 wait += 1;
796 }
797
798 /* wait for one of the internal handles to trigger */
799 wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
800
801 /* wait for internal mutex to lock event handling in threads */
802 WaitForSingleObjectEx(mutex, INFINITE, FALSE);
803
804 /* loop over the internal handles returned in the descriptors */
805 ret = 0; /* number of ready file descriptors */
806 for(i = 0; i < nfd; i++) {
807 fd = data[i].fd;
808 handle = handles[i];
809 wsasock = curlx_sitosk(fd);
810
811 /* check if the current internal handle was triggered */
812 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
813 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
814 /* first handle stdin, stdout and stderr */
815 if(fd == fileno(stdin)) {
816 /* stdin is never ready for write or exceptional */
817 FD_CLR(wsasock, writefds);
818 FD_CLR(wsasock, exceptfds);
819 }
820 else if(fd == fileno(stdout) || fd == fileno(stderr)) {
821 /* stdout and stderr are never ready for read or exceptional */
822 FD_CLR(wsasock, readfds);
823 FD_CLR(wsasock, exceptfds);
824 }
825 else {
826 /* try to handle the event with the WINSOCK2 functions */
827 wsaevents.lNetworkEvents = 0;
828 error = WSAEnumNetworkEvents(wsasock, handle, &wsaevents);
829 if(error != SOCKET_ERROR) {
830 /* merge result from pre-check using select */
831 wsaevents.lNetworkEvents |= data[i].wsastate;
832
833 /* remove from descriptor set if not ready for read/accept/close */
834 if(!(wsaevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
835 FD_CLR(wsasock, readfds);
836
837 /* remove from descriptor set if not ready for write/connect */
838 if(!(wsaevents.lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE)))
839 FD_CLR(wsasock, writefds);
840
841 /* remove from descriptor set if not exceptional */
842 if(!(wsaevents.lNetworkEvents & FD_OOB))
843 FD_CLR(wsasock, exceptfds);
844 }
845 }
846
847 /* check if the event has not been filtered using specific tests */
848 if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
849 FD_ISSET(wsasock, exceptfds)) {
850 ret++;
851 }
852 }
853 else {
854 /* remove from all descriptor sets since this handle did not trigger */
855 FD_CLR(wsasock, readfds);
856 FD_CLR(wsasock, writefds);
857 FD_CLR(wsasock, exceptfds);
858 }
859 }
860
861 /* signal the event handle for the other waiting threads */
862 SetEvent(abort);
863
864 for(fd = 0; fd < nfds; fd++) {
865 if(FD_ISSET(fd, readfds))
866 logmsg("[select_ws] %d is readable", fd);
867 if(FD_ISSET(fd, writefds))
868 logmsg("[select_ws] %d is writable", fd);
869 if(FD_ISSET(fd, exceptfds))
870 logmsg("[select_ws] %d is exceptional", fd);
871 }
872
873 for(i = 0; i < nws; i++) {
874 WSAEventSelect(data[i].wsasock, NULL, 0);
875 WSACloseEvent(data[i].wsaevent);
876 }
877
878 for(i = 0; i < nth; i++) {
879 WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
880 CloseHandle(data[i].thread);
881 CloseHandle(data[i].signal);
882 }
883
884 CloseHandle(abort);
885 CloseHandle(mutex);
886
887 free(handles);
888 free(data);
889
890 return ret;
891 }
892 #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
893 #endif /* USE_WINSOCK */
894
895 /*
896 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
897
898 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
899 accept()
900 */
juggle(curl_socket_t * sockfdp,curl_socket_t listenfd,enum sockmode * mode)901 static bool juggle(curl_socket_t *sockfdp,
902 curl_socket_t listenfd,
903 enum sockmode *mode)
904 {
905 struct timeval timeout;
906 fd_set fds_read;
907 fd_set fds_write;
908 fd_set fds_err;
909 curl_socket_t sockfd = CURL_SOCKET_BAD;
910 int maxfd = -99;
911 ssize_t rc;
912 int error = 0;
913
914 /* 'buffer' is this excessively large only to be able to support things like
915 test 1003 which tests exceedingly large server response lines */
916 unsigned char buffer[17010];
917 char data[16];
918
919 if(got_exit_signal) {
920 logmsg("signalled to die, exiting...");
921 return FALSE;
922 }
923
924 #ifdef HAVE_GETPPID
925 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
926 parent ftpserver process has died without killing its sockfilt children */
927 if(getppid() <= 1) {
928 logmsg("process becomes orphan, exiting");
929 return FALSE;
930 }
931 #endif
932
933 timeout.tv_sec = 120;
934 timeout.tv_usec = 0;
935
936 FD_ZERO(&fds_read);
937 FD_ZERO(&fds_write);
938 FD_ZERO(&fds_err);
939
940 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
941
942 switch(*mode) {
943
944 case PASSIVE_LISTEN:
945
946 /* server mode */
947 sockfd = listenfd;
948 /* there's always a socket to wait for */
949 FD_SET(sockfd, &fds_read);
950 maxfd = (int)sockfd;
951 break;
952
953 case PASSIVE_CONNECT:
954
955 sockfd = *sockfdp;
956 if(CURL_SOCKET_BAD == sockfd) {
957 /* eeek, we are supposedly connected and then this cannot be -1 ! */
958 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
959 maxfd = 0; /* stdin */
960 }
961 else {
962 /* there's always a socket to wait for */
963 FD_SET(sockfd, &fds_read);
964 maxfd = (int)sockfd;
965 }
966 break;
967
968 case ACTIVE:
969
970 sockfd = *sockfdp;
971 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
972 if(CURL_SOCKET_BAD != sockfd) {
973 FD_SET(sockfd, &fds_read);
974 maxfd = (int)sockfd;
975 }
976 else {
977 logmsg("No socket to read on");
978 maxfd = 0;
979 }
980 break;
981
982 case ACTIVE_DISCONNECT:
983
984 logmsg("disconnected, no socket to read on");
985 maxfd = 0;
986 sockfd = CURL_SOCKET_BAD;
987 break;
988
989 } /* switch(*mode) */
990
991
992 do {
993
994 /* select() blocking behavior call on blocking descriptors please */
995
996 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
997
998 if(got_exit_signal) {
999 logmsg("signalled to die, exiting...");
1000 return FALSE;
1001 }
1002
1003 } while((rc == -1) && ((error = errno) == EINTR));
1004
1005 if(rc < 0) {
1006 logmsg("select() failed with error: (%d) %s",
1007 error, strerror(error));
1008 return FALSE;
1009 }
1010
1011 if(rc == 0)
1012 /* timeout */
1013 return TRUE;
1014
1015
1016 if(FD_ISSET(fileno(stdin), &fds_read)) {
1017 ssize_t buffer_len;
1018 /* read from stdin, commands/data to be dealt with and possibly passed on
1019 to the socket
1020
1021 protocol:
1022
1023 4 letter command + LF [mandatory]
1024
1025 4-digit hexadecimal data length + LF [if the command takes data]
1026 data [the data being as long as set above]
1027
1028 Commands:
1029
1030 DATA - plain pass-through data
1031 */
1032
1033 if(!read_stdin(buffer, 5))
1034 return FALSE;
1035
1036 logmsg("Received %c%c%c%c (on stdin)",
1037 buffer[0], buffer[1], buffer[2], buffer[3]);
1038
1039 if(!memcmp("PING", buffer, 4)) {
1040 /* send reply on stdout, just proving we are alive */
1041 if(!write_stdout("PONG\n", 5))
1042 return FALSE;
1043 }
1044
1045 else if(!memcmp("PORT", buffer, 4)) {
1046 /* Question asking us what PORT number we are listening to.
1047 Replies to PORT with "IPv[num]/[port]" */
1048 msnprintf((char *)buffer, sizeof(buffer), "%s/%hu\n", ipv_inuse, port);
1049 buffer_len = (ssize_t)strlen((char *)buffer);
1050 msnprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
1051 if(!write_stdout(data, 10))
1052 return FALSE;
1053 if(!write_stdout(buffer, buffer_len))
1054 return FALSE;
1055 }
1056 else if(!memcmp("QUIT", buffer, 4)) {
1057 /* just die */
1058 logmsg("quits");
1059 return FALSE;
1060 }
1061 else if(!memcmp("DATA", buffer, 4)) {
1062 /* data IN => data OUT */
1063
1064 if(!read_stdin(buffer, 5))
1065 return FALSE;
1066
1067 buffer[5] = '\0';
1068
1069 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
1070 if(buffer_len > (ssize_t)sizeof(buffer)) {
1071 logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
1072 "(%zd bytes)", sizeof(buffer), buffer_len);
1073 return FALSE;
1074 }
1075 logmsg("> %zd bytes data, server => client", buffer_len);
1076
1077 if(!read_stdin(buffer, buffer_len))
1078 return FALSE;
1079
1080 lograw(buffer, buffer_len);
1081
1082 if(*mode == PASSIVE_LISTEN) {
1083 logmsg("*** We are disconnected!");
1084 if(!write_stdout("DISC\n", 5))
1085 return FALSE;
1086 }
1087 else {
1088 /* send away on the socket */
1089 ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
1090 if(bytes_written != buffer_len) {
1091 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
1092 buffer_len, bytes_written);
1093 }
1094 }
1095 }
1096 else if(!memcmp("DISC", buffer, 4)) {
1097 /* disconnect! */
1098 if(!write_stdout("DISC\n", 5))
1099 return FALSE;
1100 if(sockfd != CURL_SOCKET_BAD) {
1101 logmsg("====> Client forcibly disconnected");
1102 sclose(sockfd);
1103 *sockfdp = CURL_SOCKET_BAD;
1104 if(*mode == PASSIVE_CONNECT)
1105 *mode = PASSIVE_LISTEN;
1106 else
1107 *mode = ACTIVE_DISCONNECT;
1108 }
1109 else
1110 logmsg("attempt to close already dead connection");
1111 return TRUE;
1112 }
1113 }
1114
1115
1116 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
1117 ssize_t nread_socket;
1118 if(*mode == PASSIVE_LISTEN) {
1119 /* there's no stream set up yet, this is an indication that there's a
1120 client connecting. */
1121 curl_socket_t newfd = accept(sockfd, NULL, NULL);
1122 if(CURL_SOCKET_BAD == newfd) {
1123 error = SOCKERRNO;
1124 logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
1125 sockfd, error, strerror(error));
1126 }
1127 else {
1128 logmsg("====> Client connect");
1129 if(!write_stdout("CNCT\n", 5))
1130 return FALSE;
1131 *sockfdp = newfd; /* store the new socket */
1132 *mode = PASSIVE_CONNECT; /* we have connected */
1133 }
1134 return TRUE;
1135 }
1136
1137 /* read from socket, pass on data to stdout */
1138 nread_socket = sread(sockfd, buffer, sizeof(buffer));
1139
1140 if(nread_socket > 0) {
1141 msnprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
1142 if(!write_stdout(data, 10))
1143 return FALSE;
1144 if(!write_stdout(buffer, nread_socket))
1145 return FALSE;
1146
1147 logmsg("< %zd bytes data, client => server", nread_socket);
1148 lograw(buffer, nread_socket);
1149 }
1150
1151 if(nread_socket <= 0) {
1152 logmsg("====> Client disconnect");
1153 if(!write_stdout("DISC\n", 5))
1154 return FALSE;
1155 sclose(sockfd);
1156 *sockfdp = CURL_SOCKET_BAD;
1157 if(*mode == PASSIVE_CONNECT)
1158 *mode = PASSIVE_LISTEN;
1159 else
1160 *mode = ACTIVE_DISCONNECT;
1161 return TRUE;
1162 }
1163 }
1164
1165 return TRUE;
1166 }
1167
sockdaemon(curl_socket_t sock,unsigned short * listenport)1168 static curl_socket_t sockdaemon(curl_socket_t sock,
1169 unsigned short *listenport)
1170 {
1171 /* passive daemon style */
1172 srvr_sockaddr_union_t listener;
1173 int flag;
1174 int rc;
1175 int totdelay = 0;
1176 int maxretr = 10;
1177 int delay = 20;
1178 int attempt = 0;
1179 int error = 0;
1180
1181 do {
1182 attempt++;
1183 flag = 1;
1184 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1185 (void *)&flag, sizeof(flag));
1186 if(rc) {
1187 error = SOCKERRNO;
1188 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
1189 error, strerror(error));
1190 if(maxretr) {
1191 rc = wait_ms(delay);
1192 if(rc) {
1193 /* should not happen */
1194 error = errno;
1195 logmsg("wait_ms() failed with error: (%d) %s",
1196 error, strerror(error));
1197 sclose(sock);
1198 return CURL_SOCKET_BAD;
1199 }
1200 if(got_exit_signal) {
1201 logmsg("signalled to die, exiting...");
1202 sclose(sock);
1203 return CURL_SOCKET_BAD;
1204 }
1205 totdelay += delay;
1206 delay *= 2; /* double the sleep for next attempt */
1207 }
1208 }
1209 } while(rc && maxretr--);
1210
1211 if(rc) {
1212 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
1213 attempt, totdelay, error, strerror(error));
1214 logmsg("Continuing anyway...");
1215 }
1216
1217 /* When the specified listener port is zero, it is actually a
1218 request to let the system choose a non-zero available port. */
1219
1220 #ifdef ENABLE_IPV6
1221 if(!use_ipv6) {
1222 #endif
1223 memset(&listener.sa4, 0, sizeof(listener.sa4));
1224 listener.sa4.sin_family = AF_INET;
1225 listener.sa4.sin_addr.s_addr = INADDR_ANY;
1226 listener.sa4.sin_port = htons(*listenport);
1227 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
1228 #ifdef ENABLE_IPV6
1229 }
1230 else {
1231 memset(&listener.sa6, 0, sizeof(listener.sa6));
1232 listener.sa6.sin6_family = AF_INET6;
1233 listener.sa6.sin6_addr = in6addr_any;
1234 listener.sa6.sin6_port = htons(*listenport);
1235 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1236 }
1237 #endif /* ENABLE_IPV6 */
1238 if(rc) {
1239 error = SOCKERRNO;
1240 logmsg("Error binding socket on port %hu: (%d) %s",
1241 *listenport, error, strerror(error));
1242 sclose(sock);
1243 return CURL_SOCKET_BAD;
1244 }
1245
1246 if(!*listenport) {
1247 /* The system was supposed to choose a port number, figure out which
1248 port we actually got and update the listener port value with it. */
1249 curl_socklen_t la_size;
1250 srvr_sockaddr_union_t localaddr;
1251 #ifdef ENABLE_IPV6
1252 if(!use_ipv6)
1253 #endif
1254 la_size = sizeof(localaddr.sa4);
1255 #ifdef ENABLE_IPV6
1256 else
1257 la_size = sizeof(localaddr.sa6);
1258 #endif
1259 memset(&localaddr.sa, 0, (size_t)la_size);
1260 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1261 error = SOCKERRNO;
1262 logmsg("getsockname() failed with error: (%d) %s",
1263 error, strerror(error));
1264 sclose(sock);
1265 return CURL_SOCKET_BAD;
1266 }
1267 switch(localaddr.sa.sa_family) {
1268 case AF_INET:
1269 *listenport = ntohs(localaddr.sa4.sin_port);
1270 break;
1271 #ifdef ENABLE_IPV6
1272 case AF_INET6:
1273 *listenport = ntohs(localaddr.sa6.sin6_port);
1274 break;
1275 #endif
1276 default:
1277 break;
1278 }
1279 if(!*listenport) {
1280 /* Real failure, listener port shall not be zero beyond this point. */
1281 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1282 logmsg("A valid reason for this failure is a binary built without");
1283 logmsg("proper network library linkage. This might not be the only");
1284 logmsg("reason, but double check it before anything else.");
1285 sclose(sock);
1286 return CURL_SOCKET_BAD;
1287 }
1288 }
1289
1290 /* bindonly option forces no listening */
1291 if(bind_only) {
1292 logmsg("instructed to bind port without listening");
1293 return sock;
1294 }
1295
1296 /* start accepting connections */
1297 rc = listen(sock, 5);
1298 if(0 != rc) {
1299 error = SOCKERRNO;
1300 logmsg("listen(%d, 5) failed with error: (%d) %s",
1301 sock, error, strerror(error));
1302 sclose(sock);
1303 return CURL_SOCKET_BAD;
1304 }
1305
1306 return sock;
1307 }
1308
1309
main(int argc,char * argv[])1310 int main(int argc, char *argv[])
1311 {
1312 srvr_sockaddr_union_t me;
1313 curl_socket_t sock = CURL_SOCKET_BAD;
1314 curl_socket_t msgsock = CURL_SOCKET_BAD;
1315 int wrotepidfile = 0;
1316 const char *pidname = ".sockfilt.pid";
1317 const char *portfile = NULL; /* none by default */
1318 bool juggle_again;
1319 int rc;
1320 int error;
1321 int arg = 1;
1322 enum sockmode mode = PASSIVE_LISTEN; /* default */
1323 const char *addr = NULL;
1324
1325 while(argc>arg) {
1326 if(!strcmp("--version", argv[arg])) {
1327 printf("sockfilt IPv4%s\n",
1328 #ifdef ENABLE_IPV6
1329 "/IPv6"
1330 #else
1331 ""
1332 #endif
1333 );
1334 return 0;
1335 }
1336 else if(!strcmp("--verbose", argv[arg])) {
1337 verbose = TRUE;
1338 arg++;
1339 }
1340 else if(!strcmp("--pidfile", argv[arg])) {
1341 arg++;
1342 if(argc>arg)
1343 pidname = argv[arg++];
1344 }
1345 else if(!strcmp("--portfile", argv[arg])) {
1346 arg++;
1347 if(argc > arg)
1348 portfile = argv[arg++];
1349 }
1350 else if(!strcmp("--logfile", argv[arg])) {
1351 arg++;
1352 if(argc>arg)
1353 serverlogfile = argv[arg++];
1354 }
1355 else if(!strcmp("--ipv6", argv[arg])) {
1356 #ifdef ENABLE_IPV6
1357 ipv_inuse = "IPv6";
1358 use_ipv6 = TRUE;
1359 #endif
1360 arg++;
1361 }
1362 else if(!strcmp("--ipv4", argv[arg])) {
1363 /* for completeness, we support this option as well */
1364 #ifdef ENABLE_IPV6
1365 ipv_inuse = "IPv4";
1366 use_ipv6 = FALSE;
1367 #endif
1368 arg++;
1369 }
1370 else if(!strcmp("--bindonly", argv[arg])) {
1371 bind_only = TRUE;
1372 arg++;
1373 }
1374 else if(!strcmp("--port", argv[arg])) {
1375 arg++;
1376 if(argc>arg) {
1377 char *endptr;
1378 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1379 port = curlx_ultous(ulnum);
1380 arg++;
1381 }
1382 }
1383 else if(!strcmp("--connect", argv[arg])) {
1384 /* Asked to actively connect to the specified local port instead of
1385 doing a passive server-style listening. */
1386 arg++;
1387 if(argc>arg) {
1388 char *endptr;
1389 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1390 if((endptr != argv[arg] + strlen(argv[arg])) ||
1391 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1392 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1393 argv[arg]);
1394 return 0;
1395 }
1396 connectport = curlx_ultous(ulnum);
1397 arg++;
1398 }
1399 }
1400 else if(!strcmp("--addr", argv[arg])) {
1401 /* Set an IP address to use with --connect; otherwise use localhost */
1402 arg++;
1403 if(argc>arg) {
1404 addr = argv[arg];
1405 arg++;
1406 }
1407 }
1408 else {
1409 puts("Usage: sockfilt [option]\n"
1410 " --version\n"
1411 " --verbose\n"
1412 " --logfile [file]\n"
1413 " --pidfile [file]\n"
1414 " --ipv4\n"
1415 " --ipv6\n"
1416 " --bindonly\n"
1417 " --port [port]\n"
1418 " --connect [port]\n"
1419 " --addr [address]");
1420 return 0;
1421 }
1422 }
1423
1424 #ifdef WIN32
1425 win32_init();
1426 atexit(win32_cleanup);
1427
1428 setmode(fileno(stdin), O_BINARY);
1429 setmode(fileno(stdout), O_BINARY);
1430 setmode(fileno(stderr), O_BINARY);
1431 #endif
1432
1433 install_signal_handlers(false);
1434
1435 #ifdef ENABLE_IPV6
1436 if(!use_ipv6)
1437 #endif
1438 sock = socket(AF_INET, SOCK_STREAM, 0);
1439 #ifdef ENABLE_IPV6
1440 else
1441 sock = socket(AF_INET6, SOCK_STREAM, 0);
1442 #endif
1443
1444 if(CURL_SOCKET_BAD == sock) {
1445 error = SOCKERRNO;
1446 logmsg("Error creating socket: (%d) %s",
1447 error, strerror(error));
1448 write_stdout("FAIL\n", 5);
1449 goto sockfilt_cleanup;
1450 }
1451
1452 if(connectport) {
1453 /* Active mode, we should connect to the given port number */
1454 mode = ACTIVE;
1455 #ifdef ENABLE_IPV6
1456 if(!use_ipv6) {
1457 #endif
1458 memset(&me.sa4, 0, sizeof(me.sa4));
1459 me.sa4.sin_family = AF_INET;
1460 me.sa4.sin_port = htons(connectport);
1461 me.sa4.sin_addr.s_addr = INADDR_ANY;
1462 if(!addr)
1463 addr = "127.0.0.1";
1464 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1465
1466 rc = connect(sock, &me.sa, sizeof(me.sa4));
1467 #ifdef ENABLE_IPV6
1468 }
1469 else {
1470 memset(&me.sa6, 0, sizeof(me.sa6));
1471 me.sa6.sin6_family = AF_INET6;
1472 me.sa6.sin6_port = htons(connectport);
1473 if(!addr)
1474 addr = "::1";
1475 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1476
1477 rc = connect(sock, &me.sa, sizeof(me.sa6));
1478 }
1479 #endif /* ENABLE_IPV6 */
1480 if(rc) {
1481 error = SOCKERRNO;
1482 logmsg("Error connecting to port %hu: (%d) %s",
1483 connectport, error, strerror(error));
1484 write_stdout("FAIL\n", 5);
1485 goto sockfilt_cleanup;
1486 }
1487 logmsg("====> Client connect");
1488 msgsock = sock; /* use this as stream */
1489 }
1490 else {
1491 /* passive daemon style */
1492 sock = sockdaemon(sock, &port);
1493 if(CURL_SOCKET_BAD == sock) {
1494 write_stdout("FAIL\n", 5);
1495 goto sockfilt_cleanup;
1496 }
1497 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1498 }
1499
1500 logmsg("Running %s version", ipv_inuse);
1501
1502 if(connectport)
1503 logmsg("Connected to port %hu", connectport);
1504 else if(bind_only)
1505 logmsg("Bound without listening on port %hu", port);
1506 else
1507 logmsg("Listening on port %hu", port);
1508
1509 wrotepidfile = write_pidfile(pidname);
1510 if(!wrotepidfile) {
1511 write_stdout("FAIL\n", 5);
1512 goto sockfilt_cleanup;
1513 }
1514 if(portfile) {
1515 wrotepidfile = write_portfile(portfile, port);
1516 if(!wrotepidfile) {
1517 write_stdout("FAIL\n", 5);
1518 goto sockfilt_cleanup;
1519 }
1520 }
1521
1522 do {
1523 juggle_again = juggle(&msgsock, sock, &mode);
1524 } while(juggle_again);
1525
1526 sockfilt_cleanup:
1527
1528 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1529 sclose(msgsock);
1530
1531 if(sock != CURL_SOCKET_BAD)
1532 sclose(sock);
1533
1534 if(wrotepidfile)
1535 unlink(pidname);
1536
1537 restore_signal_handlers(false);
1538
1539 if(got_exit_signal) {
1540 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1541 /*
1542 * To properly set the return status of the process we
1543 * must raise the same signal SIGINT or SIGTERM that we
1544 * caught and let the old handler take care of it.
1545 */
1546 raise(exit_signal);
1547 }
1548
1549 logmsg("============> sockfilt quits");
1550 return 0;
1551 }
1552