1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include "server_setup.h"
25
26 /* Purpose
27 *
28 * 1. Accept a TCP connection on a custom port (IPv4 or IPv6), or connect
29 * to a given (localhost) port.
30 *
31 * 2. Get commands on STDIN. Pass data on to the TCP stream.
32 * Get data from TCP stream and pass on to STDOUT.
33 *
34 * This program is made to perform all the socket/stream/connection stuff for
35 * the test suite's (perl) FTP server. Previously the perl code did all of
36 * this by its own, but I decided to let this program do the socket layer
37 * because of several things:
38 *
39 * o We want the perl code to work with rather old perl installations, thus
40 * we cannot use recent perl modules or features.
41 *
42 * o We want IPv6 support for systems that provide it, and doing optional IPv6
43 * support in perl seems if not impossible so at least awkward.
44 *
45 * o We want FTP-SSL support, which means that a connection that starts with
46 * plain sockets needs to be able to "go SSL" in the midst. This would also
47 * require some nasty perl stuff I'd rather avoid.
48 *
49 * (Source originally based on sws.c)
50 */
51
52 /*
53 * Signal handling notes for sockfilt
54 * ----------------------------------
55 *
56 * This program is a single-threaded process.
57 *
58 * This program is intended to be highly portable and as such it must be kept
59 * as simple as possible, due to this the only signal handling mechanisms used
60 * will be those of ANSI C, and used only in the most basic form which is good
61 * enough for the purpose of this program.
62 *
63 * For the above reason and the specific needs of this program signals SIGHUP,
64 * SIGPIPE and SIGALRM will be simply ignored on systems where this can be
65 * done. If possible, signals SIGINT and SIGTERM will be handled by this
66 * program as an indication to cleanup and finish execution as soon as
67 * possible. This will be achieved with a single signal handler
68 * 'exit_signal_handler' for both signals.
69 *
70 * The 'exit_signal_handler' upon the first SIGINT or SIGTERM received signal
71 * will just set to one the global var 'got_exit_signal' storing in global var
72 * 'exit_signal' the signal that triggered this change.
73 *
74 * Nothing fancy that could introduce problems is used, the program at certain
75 * points in its normal flow checks if var 'got_exit_signal' is set and in
76 * case this is true it just makes its way out of loops and functions in
77 * structured and well behaved manner to achieve proper program cleanup and
78 * termination.
79 *
80 * Even with the above mechanism implemented it is worthwhile to note that
81 * other signals might still be received, or that there might be systems on
82 * which it is not possible to trap and ignore some of the above signals.
83 * This implies that for increased portability and reliability the program
84 * must be coded as if no signal was being ignored or handled at all. Enjoy
85 * it!
86 */
87
88 #include <signal.h>
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 "timediff.h"
111 #include "warnless.h"
112
113 /* include memdebug.h last */
114 #include "memdebug.h"
115
116 #ifdef USE_WINSOCK
117 #undef EINTR
118 #define EINTR 4 /* errno.h value */
119 #undef EAGAIN
120 #define EAGAIN 11 /* errno.h value */
121 #undef ENOMEM
122 #define ENOMEM 12 /* errno.h value */
123 #undef EINVAL
124 #define EINVAL 22 /* errno.h value */
125 #endif
126
127 #define DEFAULT_PORT 8999
128
129 #ifndef DEFAULT_LOGFILE
130 #define DEFAULT_LOGFILE "log/sockfilt.log"
131 #endif
132
133 /* buffer is this excessively large only to be able to support things like
134 test 1003 which tests exceedingly large server response lines */
135 #define BUFFER_SIZE 17010
136
137 const char *serverlogfile = DEFAULT_LOGFILE;
138
139 static bool verbose = FALSE;
140 static bool bind_only = FALSE;
141 #ifdef USE_IPV6
142 static bool use_ipv6 = FALSE;
143 #endif
144 static const char *ipv_inuse = "IPv4";
145 static unsigned short port = DEFAULT_PORT;
146 static unsigned short connectport = 0; /* if non-zero, we activate this mode */
147
148 enum sockmode {
149 PASSIVE_LISTEN, /* as a server waiting for connections */
150 PASSIVE_CONNECT, /* as a server, connected to a client */
151 ACTIVE, /* as a client, connected to a server */
152 ACTIVE_DISCONNECT /* as a client, disconnected from server */
153 };
154
155 #if defined(_WIN32) && !defined(CURL_WINDOWS_APP)
156 /*
157 * read-wrapper to support reading from stdin on Windows.
158 */
read_wincon(int fd,void * buf,size_t count)159 static ssize_t read_wincon(int fd, void *buf, size_t count)
160 {
161 HANDLE handle = NULL;
162 DWORD mode, rcount = 0;
163 BOOL success;
164
165 if(fd == fileno(stdin)) {
166 handle = GetStdHandle(STD_INPUT_HANDLE);
167 }
168 else {
169 return read(fd, buf, count);
170 }
171
172 if(GetConsoleMode(handle, &mode)) {
173 success = ReadConsole(handle, buf, curlx_uztoul(count), &rcount, NULL);
174 }
175 else {
176 success = ReadFile(handle, buf, curlx_uztoul(count), &rcount, NULL);
177 }
178 if(success) {
179 return rcount;
180 }
181
182 errno = (int)GetLastError();
183 return -1;
184 }
185 #undef read
186 #define read(a,b,c) read_wincon(a,b,c)
187
188 /*
189 * write-wrapper to support writing to stdout and stderr on Windows.
190 */
write_wincon(int fd,const void * buf,size_t count)191 static ssize_t write_wincon(int fd, const void *buf, size_t count)
192 {
193 HANDLE handle = NULL;
194 DWORD mode, wcount = 0;
195 BOOL success;
196
197 if(fd == fileno(stdout)) {
198 handle = GetStdHandle(STD_OUTPUT_HANDLE);
199 }
200 else if(fd == fileno(stderr)) {
201 handle = GetStdHandle(STD_ERROR_HANDLE);
202 }
203 else {
204 return write(fd, buf, count);
205 }
206
207 if(GetConsoleMode(handle, &mode)) {
208 success = WriteConsole(handle, buf, curlx_uztoul(count), &wcount, NULL);
209 }
210 else {
211 success = WriteFile(handle, buf, curlx_uztoul(count), &wcount, NULL);
212 }
213 if(success) {
214 return wcount;
215 }
216
217 errno = (int)GetLastError();
218 return -1;
219 }
220 #undef write
221 #define write(a,b,c) write_wincon(a,b,c)
222 #endif
223
224 /*
225 * fullread is a wrapper around the read() function. This will repeat the call
226 * to read() until it actually has read the complete number of bytes indicated
227 * in nbytes or it fails with a condition that cannot be handled with a simple
228 * retry of the read call.
229 */
230
fullread(int filedes,void * buffer,size_t nbytes)231 static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
232 {
233 int error;
234 ssize_t nread = 0;
235
236 do {
237 ssize_t rc = read(filedes,
238 (unsigned char *)buffer + nread, nbytes - nread);
239
240 if(got_exit_signal) {
241 logmsg("signalled to die");
242 return -1;
243 }
244
245 if(rc < 0) {
246 error = errno;
247 if((error == EINTR) || (error == EAGAIN))
248 continue;
249 logmsg("reading from file descriptor: %d,", filedes);
250 logmsg("unrecoverable read() failure: (%d) %s",
251 error, strerror(error));
252 return -1;
253 }
254
255 if(rc == 0) {
256 logmsg("got 0 reading from stdin");
257 return 0;
258 }
259
260 nread += rc;
261
262 } while((size_t)nread < nbytes);
263
264 if(verbose)
265 logmsg("read %zd bytes", nread);
266
267 return nread;
268 }
269
270 /*
271 * fullwrite is a wrapper around the write() function. This will repeat the
272 * call to write() until it actually has written the complete number of bytes
273 * indicated in nbytes or it fails with a condition that cannot be handled
274 * with a simple retry of the write call.
275 */
276
fullwrite(int filedes,const void * buffer,size_t nbytes)277 static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
278 {
279 int error;
280 ssize_t nwrite = 0;
281
282 do {
283 ssize_t wc = write(filedes, (const unsigned char *)buffer + nwrite,
284 nbytes - nwrite);
285
286 if(got_exit_signal) {
287 logmsg("signalled to die");
288 return -1;
289 }
290
291 if(wc < 0) {
292 error = errno;
293 if((error == EINTR) || (error == EAGAIN))
294 continue;
295 logmsg("writing to file descriptor: %d,", filedes);
296 logmsg("unrecoverable write() failure: (%d) %s",
297 error, strerror(error));
298 return -1;
299 }
300
301 if(wc == 0) {
302 logmsg("put 0 writing to stdout");
303 return 0;
304 }
305
306 nwrite += wc;
307
308 } while((size_t)nwrite < nbytes);
309
310 if(verbose)
311 logmsg("wrote %zd bytes", nwrite);
312
313 return nwrite;
314 }
315
316 /*
317 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
318 * blocking function that will only return TRUE when nbytes have actually been
319 * read or FALSE when an unrecoverable error has been detected. Failure of this
320 * function is an indication that the sockfilt process should terminate.
321 */
322
read_stdin(void * buffer,size_t nbytes)323 static bool read_stdin(void *buffer, size_t nbytes)
324 {
325 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
326 if(nread != (ssize_t)nbytes) {
327 logmsg("exiting...");
328 return FALSE;
329 }
330 return TRUE;
331 }
332
333 /*
334 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
335 * blocking function that will only return TRUE when nbytes have actually been
336 * written or FALSE when an unrecoverable error has been detected. Failure of
337 * this function is an indication that the sockfilt process should terminate.
338 */
339
write_stdout(const void * buffer,size_t nbytes)340 static bool write_stdout(const void *buffer, size_t nbytes)
341 {
342 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
343 if(nwrite != (ssize_t)nbytes) {
344 logmsg("exiting...");
345 return FALSE;
346 }
347 return TRUE;
348 }
349
lograw(unsigned char * buffer,ssize_t len)350 static void lograw(unsigned char *buffer, ssize_t len)
351 {
352 char data[120];
353 ssize_t i;
354 unsigned char *ptr = buffer;
355 char *optr = data;
356 ssize_t width = 0;
357 int left = sizeof(data);
358
359 for(i = 0; i<len; i++) {
360 switch(ptr[i]) {
361 case '\n':
362 msnprintf(optr, left, "\\n");
363 width += 2;
364 optr += 2;
365 left -= 2;
366 break;
367 case '\r':
368 msnprintf(optr, left, "\\r");
369 width += 2;
370 optr += 2;
371 left -= 2;
372 break;
373 default:
374 msnprintf(optr, left, "%c", (ISGRAPH(ptr[i]) ||
375 ptr[i] == 0x20) ?ptr[i]:'.');
376 width++;
377 optr++;
378 left--;
379 break;
380 }
381
382 if(width>60) {
383 logmsg("'%s'", data);
384 width = 0;
385 optr = data;
386 left = sizeof(data);
387 }
388 }
389 if(width)
390 logmsg("'%s'", data);
391 }
392
393 /*
394 * handle the DATA command
395 * maxlen is the available space in buffer (input)
396 * *buffer_len is the amount of data in the buffer (output)
397 */
read_data_block(unsigned char * buffer,ssize_t maxlen,ssize_t * buffer_len)398 static bool read_data_block(unsigned char *buffer, ssize_t maxlen,
399 ssize_t *buffer_len)
400 {
401 if(!read_stdin(buffer, 5))
402 return FALSE;
403
404 buffer[5] = '\0';
405
406 *buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
407 if(*buffer_len > maxlen) {
408 logmsg("ERROR: Buffer size (%zd bytes) too small for data size "
409 "(%zd bytes)", maxlen, *buffer_len);
410 return FALSE;
411 }
412 logmsg("> %zd bytes data, server => client", *buffer_len);
413
414 if(!read_stdin(buffer, *buffer_len))
415 return FALSE;
416
417 lograw(buffer, *buffer_len);
418
419 return TRUE;
420 }
421
422
423 #if defined(USE_WINSOCK) && !defined(CURL_WINDOWS_APP)
424 /*
425 * WinSock select() does not support standard file descriptors,
426 * it can only check SOCKETs. The following function is an attempt
427 * to re-create a select() function with support for other handle types.
428 *
429 * select() function with support for WINSOCK2 sockets and all
430 * other handle types supported by WaitForMultipleObjectsEx() as
431 * well as disk files, anonymous and names pipes, and character input.
432 *
433 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
434 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
435 */
436 struct select_ws_wait_data {
437 HANDLE handle; /* actual handle to wait for during select */
438 HANDLE signal; /* internal event to signal handle trigger */
439 HANDLE abort; /* internal event to abort waiting threads */
440 };
441 #ifdef _WIN32_WCE
select_ws_wait_thread(LPVOID lpParameter)442 static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter)
443 #else
444 #include <process.h>
445 static unsigned int WINAPI select_ws_wait_thread(void *lpParameter)
446 #endif
447 {
448 struct select_ws_wait_data *data;
449 HANDLE signal, handle, handles[2];
450 INPUT_RECORD inputrecord;
451 LARGE_INTEGER size, pos;
452 DWORD type, length, ret;
453
454 /* retrieve handles from internal structure */
455 data = (struct select_ws_wait_data *) lpParameter;
456 if(data) {
457 handle = data->handle;
458 handles[0] = data->abort;
459 handles[1] = handle;
460 signal = data->signal;
461 free(data);
462 }
463 else
464 return (DWORD)-1;
465
466 /* retrieve the type of file to wait on */
467 type = GetFileType(handle);
468 switch(type) {
469 case FILE_TYPE_DISK:
470 /* The handle represents a file on disk, this means:
471 * - WaitForMultipleObjectsEx will always be signalled for it.
472 * - comparison of current position in file and total size of
473 * the file can be used to check if we reached the end yet.
474 *
475 * Approach: Loop till either the internal event is signalled
476 * or if the end of the file has already been reached.
477 */
478 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
479 == WAIT_TIMEOUT) {
480 /* get total size of file */
481 length = 0;
482 size.QuadPart = 0;
483 size.LowPart = GetFileSize(handle, &length);
484 if((size.LowPart != INVALID_FILE_SIZE) ||
485 (GetLastError() == NO_ERROR)) {
486 size.HighPart = (LONG)length;
487 /* get the current position within the file */
488 pos.QuadPart = 0;
489 pos.LowPart = SetFilePointer(handle, 0, &pos.HighPart, FILE_CURRENT);
490 if((pos.LowPart != INVALID_SET_FILE_POINTER) ||
491 (GetLastError() == NO_ERROR)) {
492 /* compare position with size, abort if not equal */
493 if(size.QuadPart == pos.QuadPart) {
494 /* sleep and continue waiting */
495 SleepEx(0, FALSE);
496 continue;
497 }
498 }
499 }
500 /* there is some data available, stop waiting */
501 logmsg("[select_ws_wait_thread] data available, DISK: %p", handle);
502 SetEvent(signal);
503 }
504 break;
505
506 case FILE_TYPE_CHAR:
507 /* The handle represents a character input, this means:
508 * - WaitForMultipleObjectsEx will be signalled on any kind of input,
509 * including mouse and window size events we do not care about.
510 *
511 * Approach: Loop till either the internal event is signalled
512 * or we get signalled for an actual key-event.
513 */
514 while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
515 == WAIT_OBJECT_0 + 1) {
516 /* check if this is an actual console handle */
517 if(GetConsoleMode(handle, &ret)) {
518 /* retrieve an event from the console buffer */
519 length = 0;
520 if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
521 /* check if the event is not an actual key-event */
522 if(length == 1 && inputrecord.EventType != KEY_EVENT) {
523 /* purge the non-key-event and continue waiting */
524 ReadConsoleInput(handle, &inputrecord, 1, &length);
525 continue;
526 }
527 }
528 }
529 /* there is some data available, stop waiting */
530 logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle);
531 SetEvent(signal);
532 }
533 break;
534
535 case FILE_TYPE_PIPE:
536 /* The handle represents an anonymous or named pipe, this means:
537 * - WaitForMultipleObjectsEx will always be signalled for it.
538 * - peek into the pipe and retrieve the amount of data available.
539 *
540 * Approach: Loop till either the internal event is signalled
541 * or there is data in the pipe available for reading.
542 */
543 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
544 == WAIT_TIMEOUT) {
545 /* peek into the pipe and retrieve the amount of data available */
546 length = 0;
547 if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
548 /* if there is no data available, sleep and continue waiting */
549 if(length == 0) {
550 SleepEx(0, FALSE);
551 continue;
552 }
553 else {
554 logmsg("[select_ws_wait_thread] PeekNamedPipe len: %lu", length);
555 }
556 }
557 else {
558 /* if the pipe has NOT been closed, sleep and continue waiting */
559 ret = GetLastError();
560 if(ret != ERROR_BROKEN_PIPE) {
561 logmsg("[select_ws_wait_thread] PeekNamedPipe error: %lu", ret);
562 SleepEx(0, FALSE);
563 continue;
564 }
565 else {
566 logmsg("[select_ws_wait_thread] pipe closed, PIPE: %p", handle);
567 }
568 }
569 /* there is some data available, stop waiting */
570 logmsg("[select_ws_wait_thread] data available, PIPE: %p", handle);
571 SetEvent(signal);
572 }
573 break;
574
575 default:
576 /* The handle has an unknown type, try to wait on it */
577 if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
578 == WAIT_OBJECT_0 + 1) {
579 logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle);
580 SetEvent(signal);
581 }
582 break;
583 }
584
585 return 0;
586 }
select_ws_wait(HANDLE handle,HANDLE signal,HANDLE abort)587 static HANDLE select_ws_wait(HANDLE handle, HANDLE signal, HANDLE abort)
588 {
589 #ifdef _WIN32_WCE
590 typedef HANDLE curl_win_thread_handle_t;
591 #else
592 typedef uintptr_t curl_win_thread_handle_t;
593 #endif
594 struct select_ws_wait_data *data;
595 curl_win_thread_handle_t thread;
596
597 /* allocate internal waiting data structure */
598 data = malloc(sizeof(struct select_ws_wait_data));
599 if(data) {
600 data->handle = handle;
601 data->signal = signal;
602 data->abort = abort;
603
604 /* launch waiting thread */
605 #ifdef _WIN32_WCE
606 thread = CreateThread(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
607 #else
608 thread = _beginthreadex(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
609 #endif
610
611 /* free data if thread failed to launch */
612 if(!thread) {
613 free(data);
614 }
615 return (HANDLE)thread;
616 }
617 return NULL;
618 }
619 struct select_ws_data {
620 int fd; /* provided file descriptor (indexed by nfd) */
621 long wsastate; /* internal pre-select state (indexed by nfd) */
622 curl_socket_t wsasock; /* internal socket handle (indexed by nws) */
623 WSAEVENT wsaevent; /* internal select event (indexed by nws) */
624 HANDLE signal; /* internal thread signal (indexed by nth) */
625 HANDLE thread; /* internal thread handle (indexed by nth) */
626 };
select_ws(int nfds,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct timeval * tv)627 static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
628 fd_set *exceptfds, struct timeval *tv)
629 {
630 DWORD timeout_ms, wait, nfd, nth, nws, i;
631 HANDLE abort, signal, handle, *handles;
632 fd_set readsock, writesock, exceptsock;
633 struct select_ws_data *data;
634 WSANETWORKEVENTS wsaevents;
635 curl_socket_t wsasock;
636 int error, ret, fd;
637 WSAEVENT wsaevent;
638
639 /* check if the input value is valid */
640 if(nfds < 0) {
641 errno = EINVAL;
642 return -1;
643 }
644
645 /* convert struct timeval to milliseconds */
646 if(tv) {
647 timeout_ms = (DWORD)curlx_tvtoms(tv);
648 }
649 else {
650 timeout_ms = INFINITE;
651 }
652
653 /* check if we got descriptors, sleep in case we got none */
654 if(!nfds) {
655 SleepEx(timeout_ms, FALSE);
656 return 0;
657 }
658
659 /* create internal event to abort waiting threads */
660 abort = CreateEvent(NULL, TRUE, FALSE, NULL);
661 if(!abort) {
662 errno = ENOMEM;
663 return -1;
664 }
665
666 /* allocate internal array for the internal data */
667 data = calloc(nfds, sizeof(struct select_ws_data));
668 if(!data) {
669 CloseHandle(abort);
670 errno = ENOMEM;
671 return -1;
672 }
673
674 /* allocate internal array for the internal event handles */
675 handles = calloc(nfds + 1, sizeof(HANDLE));
676 if(!handles) {
677 CloseHandle(abort);
678 free(data);
679 errno = ENOMEM;
680 return -1;
681 }
682
683 /* loop over the handles in the input descriptor sets */
684 nfd = 0; /* number of handled file descriptors */
685 nth = 0; /* number of internal waiting threads */
686 nws = 0; /* number of handled WINSOCK sockets */
687 for(fd = 0; fd < nfds; fd++) {
688 wsasock = curlx_sitosk(fd);
689 wsaevents.lNetworkEvents = 0;
690 handles[nfd] = 0;
691
692 FD_ZERO(&readsock);
693 FD_ZERO(&writesock);
694 FD_ZERO(&exceptsock);
695
696 if(FD_ISSET(wsasock, readfds)) {
697 FD_SET(wsasock, &readsock);
698 wsaevents.lNetworkEvents |= FD_READ|FD_ACCEPT|FD_CLOSE;
699 }
700
701 if(FD_ISSET(wsasock, writefds)) {
702 FD_SET(wsasock, &writesock);
703 wsaevents.lNetworkEvents |= FD_WRITE|FD_CONNECT|FD_CLOSE;
704 }
705
706 if(FD_ISSET(wsasock, exceptfds)) {
707 FD_SET(wsasock, &exceptsock);
708 wsaevents.lNetworkEvents |= FD_OOB;
709 }
710
711 /* only wait for events for which we actually care */
712 if(wsaevents.lNetworkEvents) {
713 data[nfd].fd = fd;
714 if(fd == fileno(stdin)) {
715 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
716 if(signal) {
717 handle = GetStdHandle(STD_INPUT_HANDLE);
718 handle = select_ws_wait(handle, signal, abort);
719 if(handle) {
720 handles[nfd] = signal;
721 data[nth].signal = signal;
722 data[nth].thread = handle;
723 nfd++;
724 nth++;
725 }
726 else {
727 CloseHandle(signal);
728 }
729 }
730 }
731 else if(fd == fileno(stdout)) {
732 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
733 nfd++;
734 }
735 else if(fd == fileno(stderr)) {
736 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
737 nfd++;
738 }
739 else {
740 wsaevent = WSACreateEvent();
741 if(wsaevent != WSA_INVALID_EVENT) {
742 if(wsaevents.lNetworkEvents & FD_WRITE) {
743 send(wsasock, NULL, 0, 0); /* reset FD_WRITE */
744 }
745 error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
746 if(error != SOCKET_ERROR) {
747 handles[nfd] = (HANDLE)wsaevent;
748 data[nws].wsasock = wsasock;
749 data[nws].wsaevent = wsaevent;
750 data[nfd].wsastate = 0;
751 tv->tv_sec = 0;
752 tv->tv_usec = 0;
753 /* check if the socket is already ready */
754 if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
755 logmsg("[select_ws] socket %d is ready", fd);
756 WSASetEvent(wsaevent);
757 if(FD_ISSET(wsasock, &readsock))
758 data[nfd].wsastate |= FD_READ;
759 if(FD_ISSET(wsasock, &writesock))
760 data[nfd].wsastate |= FD_WRITE;
761 if(FD_ISSET(wsasock, &exceptsock))
762 data[nfd].wsastate |= FD_OOB;
763 }
764 nfd++;
765 nws++;
766 }
767 else {
768 WSACloseEvent(wsaevent);
769 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
770 if(signal) {
771 handle = (HANDLE)wsasock;
772 handle = select_ws_wait(handle, signal, abort);
773 if(handle) {
774 handles[nfd] = signal;
775 data[nth].signal = signal;
776 data[nth].thread = handle;
777 nfd++;
778 nth++;
779 }
780 else {
781 CloseHandle(signal);
782 }
783 }
784 }
785 }
786 }
787 }
788 }
789
790 /* wait on the number of handles */
791 wait = nfd;
792
793 /* make sure we stop waiting on exit signal event */
794 if(exit_event) {
795 /* we allocated handles nfds + 1 for this */
796 handles[nfd] = exit_event;
797 wait += 1;
798 }
799
800 /* wait for one of the internal handles to trigger */
801 wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
802
803 /* signal the abort event handle and join the other waiting threads */
804 SetEvent(abort);
805 for(i = 0; i < nth; i++) {
806 WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
807 CloseHandle(data[i].thread);
808 }
809
810 /* loop over the internal handles returned in the descriptors */
811 ret = 0; /* number of ready file descriptors */
812 for(i = 0; i < nfd; i++) {
813 fd = data[i].fd;
814 handle = handles[i];
815 wsasock = curlx_sitosk(fd);
816
817 /* check if the current internal handle was triggered */
818 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
819 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
820 /* first handle stdin, stdout and stderr */
821 if(fd == fileno(stdin)) {
822 /* stdin is never ready for write or exceptional */
823 FD_CLR(wsasock, writefds);
824 FD_CLR(wsasock, exceptfds);
825 }
826 else if(fd == fileno(stdout) || fd == fileno(stderr)) {
827 /* stdout and stderr are never ready for read or exceptional */
828 FD_CLR(wsasock, readfds);
829 FD_CLR(wsasock, exceptfds);
830 }
831 else {
832 /* try to handle the event with the WINSOCK2 functions */
833 wsaevents.lNetworkEvents = 0;
834 error = WSAEnumNetworkEvents(wsasock, handle, &wsaevents);
835 if(error != SOCKET_ERROR) {
836 /* merge result from pre-check using select */
837 wsaevents.lNetworkEvents |= data[i].wsastate;
838
839 /* remove from descriptor set if not ready for read/accept/close */
840 if(!(wsaevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
841 FD_CLR(wsasock, readfds);
842
843 /* remove from descriptor set if not ready for write/connect */
844 if(!(wsaevents.lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE)))
845 FD_CLR(wsasock, writefds);
846
847 /* remove from descriptor set if not exceptional */
848 if(!(wsaevents.lNetworkEvents & FD_OOB))
849 FD_CLR(wsasock, exceptfds);
850 }
851 }
852
853 /* check if the event has not been filtered using specific tests */
854 if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
855 FD_ISSET(wsasock, exceptfds)) {
856 ret++;
857 }
858 }
859 else {
860 /* remove from all descriptor sets since this handle did not trigger */
861 FD_CLR(wsasock, readfds);
862 FD_CLR(wsasock, writefds);
863 FD_CLR(wsasock, exceptfds);
864 }
865 }
866
867 for(fd = 0; fd < nfds; fd++) {
868 if(FD_ISSET(fd, readfds))
869 logmsg("[select_ws] %d is readable", fd);
870 if(FD_ISSET(fd, writefds))
871 logmsg("[select_ws] %d is writable", fd);
872 if(FD_ISSET(fd, exceptfds))
873 logmsg("[select_ws] %d is exceptional", fd);
874 }
875
876 for(i = 0; i < nws; i++) {
877 WSAEventSelect(data[i].wsasock, NULL, 0);
878 WSACloseEvent(data[i].wsaevent);
879 }
880
881 for(i = 0; i < nth; i++) {
882 CloseHandle(data[i].signal);
883 }
884 CloseHandle(abort);
885
886 free(handles);
887 free(data);
888
889 return ret;
890 }
891 #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
892 #endif /* USE_WINSOCK */
893
894
895 /* Perform the disconnect handshake with sockfilt
896 * This involves waiting for the disconnect acknowledgment after the DISC
897 * command, while throwing away anything else that might come in before
898 * that.
899 */
disc_handshake(void)900 static bool disc_handshake(void)
901 {
902 if(!write_stdout("DISC\n", 5))
903 return FALSE;
904
905 do {
906 unsigned char buffer[BUFFER_SIZE];
907 ssize_t buffer_len;
908 if(!read_stdin(buffer, 5))
909 return FALSE;
910 logmsg("Received %c%c%c%c (on stdin)",
911 buffer[0], buffer[1], buffer[2], buffer[3]);
912
913 if(!memcmp("ACKD", buffer, 4)) {
914 /* got the ack we were waiting for */
915 break;
916 }
917 else if(!memcmp("DISC", buffer, 4)) {
918 logmsg("Crikey! Client also wants to disconnect");
919 if(!write_stdout("ACKD\n", 5))
920 return FALSE;
921 }
922 else if(!memcmp("DATA", buffer, 4)) {
923 /* We must read more data to stay in sync */
924 logmsg("Throwing away data bytes");
925 if(!read_data_block(buffer, sizeof(buffer), &buffer_len))
926 return FALSE;
927
928 }
929 else if(!memcmp("QUIT", buffer, 4)) {
930 /* just die */
931 logmsg("quits");
932 return FALSE;
933 }
934 else {
935 logmsg("Error: unexpected message; aborting");
936 /*
937 * The only other messages that could occur here are PING and PORT,
938 * and both of them occur at the start of a test when nothing should be
939 * trying to DISC. Therefore, we should not ever get here, but if we
940 * do, it's probably due to some kind of unclean shutdown situation so
941 * us shutting down is what we probably ought to be doing, anyway.
942 */
943 return FALSE;
944 }
945
946 } while(TRUE);
947 return TRUE;
948 }
949
950 /*
951 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
952
953 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
954 accept()
955 */
juggle(curl_socket_t * sockfdp,curl_socket_t listenfd,enum sockmode * mode)956 static bool juggle(curl_socket_t *sockfdp,
957 curl_socket_t listenfd,
958 enum sockmode *mode)
959 {
960 struct timeval timeout;
961 fd_set fds_read;
962 fd_set fds_write;
963 fd_set fds_err;
964 curl_socket_t sockfd = CURL_SOCKET_BAD;
965 int maxfd = -99;
966 ssize_t rc;
967 int error = 0;
968
969 unsigned char buffer[BUFFER_SIZE];
970 char data[16];
971
972 if(got_exit_signal) {
973 logmsg("signalled to die, exiting...");
974 return FALSE;
975 }
976
977 #ifdef HAVE_GETPPID
978 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
979 parent ftpserver process has died without killing its sockfilt children */
980 if(getppid() <= 1) {
981 logmsg("process becomes orphan, exiting");
982 return FALSE;
983 }
984 #endif
985
986 timeout.tv_sec = 120;
987 timeout.tv_usec = 0;
988
989 FD_ZERO(&fds_read);
990 FD_ZERO(&fds_write);
991 FD_ZERO(&fds_err);
992
993 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
994
995 switch(*mode) {
996
997 case PASSIVE_LISTEN:
998
999 /* server mode */
1000 sockfd = listenfd;
1001 /* there's always a socket to wait for */
1002 FD_SET(sockfd, &fds_read);
1003 maxfd = (int)sockfd;
1004 break;
1005
1006 case PASSIVE_CONNECT:
1007
1008 sockfd = *sockfdp;
1009 if(CURL_SOCKET_BAD == sockfd) {
1010 /* eeek, we are supposedly connected and then this cannot be -1 ! */
1011 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
1012 maxfd = 0; /* stdin */
1013 }
1014 else {
1015 /* there's always a socket to wait for */
1016 FD_SET(sockfd, &fds_read);
1017 maxfd = (int)sockfd;
1018 }
1019 break;
1020
1021 case ACTIVE:
1022
1023 sockfd = *sockfdp;
1024 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
1025 if(CURL_SOCKET_BAD != sockfd) {
1026 FD_SET(sockfd, &fds_read);
1027 maxfd = (int)sockfd;
1028 }
1029 else {
1030 logmsg("No socket to read on");
1031 maxfd = 0;
1032 }
1033 break;
1034
1035 case ACTIVE_DISCONNECT:
1036
1037 logmsg("disconnected, no socket to read on");
1038 maxfd = 0;
1039 sockfd = CURL_SOCKET_BAD;
1040 break;
1041
1042 } /* switch(*mode) */
1043
1044
1045 do {
1046
1047 /* select() blocking behavior call on blocking descriptors please */
1048
1049 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
1050
1051 if(got_exit_signal) {
1052 logmsg("signalled to die, exiting...");
1053 return FALSE;
1054 }
1055
1056 } while((rc == -1) && ((error = errno) == EINTR));
1057
1058 if(rc < 0) {
1059 logmsg("select() failed with error: (%d) %s",
1060 error, strerror(error));
1061 return FALSE;
1062 }
1063
1064 if(rc == 0)
1065 /* timeout */
1066 return TRUE;
1067
1068
1069 if(FD_ISSET(fileno(stdin), &fds_read)) {
1070 ssize_t buffer_len;
1071 /* read from stdin, commands/data to be dealt with and possibly passed on
1072 to the socket
1073
1074 protocol:
1075
1076 4 letter command + LF [mandatory]
1077
1078 4-digit hexadecimal data length + LF [if the command takes data]
1079 data [the data being as long as set above]
1080
1081 Commands:
1082
1083 DATA - plain pass-through data
1084 */
1085
1086 if(!read_stdin(buffer, 5))
1087 return FALSE;
1088
1089 logmsg("Received %c%c%c%c (on stdin)",
1090 buffer[0], buffer[1], buffer[2], buffer[3]);
1091
1092 if(!memcmp("PING", buffer, 4)) {
1093 /* send reply on stdout, just proving we are alive */
1094 if(!write_stdout("PONG\n", 5))
1095 return FALSE;
1096 }
1097
1098 else if(!memcmp("PORT", buffer, 4)) {
1099 /* Question asking us what PORT number we are listening to.
1100 Replies to PORT with "IPv[num]/[port]" */
1101 msnprintf((char *)buffer, sizeof(buffer), "%s/%hu\n", ipv_inuse, port);
1102 buffer_len = (ssize_t)strlen((char *)buffer);
1103 msnprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
1104 if(!write_stdout(data, 10))
1105 return FALSE;
1106 if(!write_stdout(buffer, buffer_len))
1107 return FALSE;
1108 }
1109 else if(!memcmp("QUIT", buffer, 4)) {
1110 /* just die */
1111 logmsg("quits");
1112 return FALSE;
1113 }
1114 else if(!memcmp("DATA", buffer, 4)) {
1115 /* data IN => data OUT */
1116 if(!read_data_block(buffer, sizeof(buffer), &buffer_len))
1117 return FALSE;
1118
1119 if(*mode == PASSIVE_LISTEN) {
1120 logmsg("*** We are disconnected!");
1121 if(!disc_handshake())
1122 return FALSE;
1123 }
1124 else {
1125 /* send away on the socket */
1126 ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
1127 if(bytes_written != buffer_len) {
1128 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
1129 buffer_len, bytes_written);
1130 }
1131 }
1132 }
1133 else if(!memcmp("DISC", buffer, 4)) {
1134 /* disconnect! */
1135 if(!write_stdout("ACKD\n", 5))
1136 return FALSE;
1137 if(sockfd != CURL_SOCKET_BAD) {
1138 logmsg("====> Client forcibly disconnected");
1139 sclose(sockfd);
1140 *sockfdp = CURL_SOCKET_BAD;
1141 if(*mode == PASSIVE_CONNECT)
1142 *mode = PASSIVE_LISTEN;
1143 else
1144 *mode = ACTIVE_DISCONNECT;
1145 }
1146 else
1147 logmsg("attempt to close already dead connection");
1148 return TRUE;
1149 }
1150 }
1151
1152
1153 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
1154 ssize_t nread_socket;
1155 if(*mode == PASSIVE_LISTEN) {
1156 /* there's no stream set up yet, this is an indication that there's a
1157 client connecting. */
1158 curl_socket_t newfd = accept(sockfd, NULL, NULL);
1159 if(CURL_SOCKET_BAD == newfd) {
1160 error = SOCKERRNO;
1161 logmsg("accept(%" CURL_FORMAT_SOCKET_T ", NULL, NULL) "
1162 "failed with error: (%d) %s", sockfd, error, sstrerror(error));
1163 }
1164 else {
1165 logmsg("====> Client connect");
1166 if(!write_stdout("CNCT\n", 5))
1167 return FALSE;
1168 *sockfdp = newfd; /* store the new socket */
1169 *mode = PASSIVE_CONNECT; /* we have connected */
1170 }
1171 return TRUE;
1172 }
1173
1174 /* read from socket, pass on data to stdout */
1175 nread_socket = sread(sockfd, buffer, sizeof(buffer));
1176
1177 if(nread_socket > 0) {
1178 msnprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
1179 if(!write_stdout(data, 10))
1180 return FALSE;
1181 if(!write_stdout(buffer, nread_socket))
1182 return FALSE;
1183
1184 logmsg("< %zd bytes data, client => server", nread_socket);
1185 lograw(buffer, nread_socket);
1186 }
1187
1188 if(nread_socket <= 0) {
1189 logmsg("====> Client disconnect");
1190 if(!disc_handshake())
1191 return FALSE;
1192 sclose(sockfd);
1193 *sockfdp = CURL_SOCKET_BAD;
1194 if(*mode == PASSIVE_CONNECT)
1195 *mode = PASSIVE_LISTEN;
1196 else
1197 *mode = ACTIVE_DISCONNECT;
1198 return TRUE;
1199 }
1200 }
1201
1202 return TRUE;
1203 }
1204
sockdaemon(curl_socket_t sock,unsigned short * listenport)1205 static curl_socket_t sockdaemon(curl_socket_t sock,
1206 unsigned short *listenport)
1207 {
1208 /* passive daemon style */
1209 srvr_sockaddr_union_t listener;
1210 int flag;
1211 int rc;
1212 int totdelay = 0;
1213 int maxretr = 10;
1214 int delay = 20;
1215 int attempt = 0;
1216 int error = 0;
1217
1218 do {
1219 attempt++;
1220 flag = 1;
1221 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1222 (void *)&flag, sizeof(flag));
1223 if(rc) {
1224 error = SOCKERRNO;
1225 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
1226 error, sstrerror(error));
1227 if(maxretr) {
1228 rc = wait_ms(delay);
1229 if(rc) {
1230 /* should not happen */
1231 error = errno;
1232 logmsg("wait_ms() failed with error: (%d) %s",
1233 error, strerror(error));
1234 sclose(sock);
1235 return CURL_SOCKET_BAD;
1236 }
1237 if(got_exit_signal) {
1238 logmsg("signalled to die, exiting...");
1239 sclose(sock);
1240 return CURL_SOCKET_BAD;
1241 }
1242 totdelay += delay;
1243 delay *= 2; /* double the sleep for next attempt */
1244 }
1245 }
1246 } while(rc && maxretr--);
1247
1248 if(rc) {
1249 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
1250 attempt, totdelay, error, strerror(error));
1251 logmsg("Continuing anyway...");
1252 }
1253
1254 /* When the specified listener port is zero, it is actually a
1255 request to let the system choose a non-zero available port. */
1256
1257 #ifdef USE_IPV6
1258 if(!use_ipv6) {
1259 #endif
1260 memset(&listener.sa4, 0, sizeof(listener.sa4));
1261 listener.sa4.sin_family = AF_INET;
1262 listener.sa4.sin_addr.s_addr = INADDR_ANY;
1263 listener.sa4.sin_port = htons(*listenport);
1264 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
1265 #ifdef USE_IPV6
1266 }
1267 else {
1268 memset(&listener.sa6, 0, sizeof(listener.sa6));
1269 listener.sa6.sin6_family = AF_INET6;
1270 listener.sa6.sin6_addr = in6addr_any;
1271 listener.sa6.sin6_port = htons(*listenport);
1272 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1273 }
1274 #endif /* USE_IPV6 */
1275 if(rc) {
1276 error = SOCKERRNO;
1277 logmsg("Error binding socket on port %hu: (%d) %s",
1278 *listenport, error, sstrerror(error));
1279 sclose(sock);
1280 return CURL_SOCKET_BAD;
1281 }
1282
1283 if(!*listenport) {
1284 /* The system was supposed to choose a port number, figure out which
1285 port we actually got and update the listener port value with it. */
1286 curl_socklen_t la_size;
1287 srvr_sockaddr_union_t localaddr;
1288 #ifdef USE_IPV6
1289 if(!use_ipv6)
1290 #endif
1291 la_size = sizeof(localaddr.sa4);
1292 #ifdef USE_IPV6
1293 else
1294 la_size = sizeof(localaddr.sa6);
1295 #endif
1296 memset(&localaddr.sa, 0, (size_t)la_size);
1297 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1298 error = SOCKERRNO;
1299 logmsg("getsockname() failed with error: (%d) %s",
1300 error, sstrerror(error));
1301 sclose(sock);
1302 return CURL_SOCKET_BAD;
1303 }
1304 switch(localaddr.sa.sa_family) {
1305 case AF_INET:
1306 *listenport = ntohs(localaddr.sa4.sin_port);
1307 break;
1308 #ifdef USE_IPV6
1309 case AF_INET6:
1310 *listenport = ntohs(localaddr.sa6.sin6_port);
1311 break;
1312 #endif
1313 default:
1314 break;
1315 }
1316 if(!*listenport) {
1317 /* Real failure, listener port shall not be zero beyond this point. */
1318 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1319 logmsg("A valid reason for this failure is a binary built without");
1320 logmsg("proper network library linkage. This might not be the only");
1321 logmsg("reason, but double check it before anything else.");
1322 sclose(sock);
1323 return CURL_SOCKET_BAD;
1324 }
1325 }
1326
1327 /* bindonly option forces no listening */
1328 if(bind_only) {
1329 logmsg("instructed to bind port without listening");
1330 return sock;
1331 }
1332
1333 /* start accepting connections */
1334 rc = listen(sock, 5);
1335 if(0 != rc) {
1336 error = SOCKERRNO;
1337 logmsg("listen(%" CURL_FORMAT_SOCKET_T ", 5) failed with error: (%d) %s",
1338 sock, error, sstrerror(error));
1339 sclose(sock);
1340 return CURL_SOCKET_BAD;
1341 }
1342
1343 return sock;
1344 }
1345
1346
main(int argc,char * argv[])1347 int main(int argc, char *argv[])
1348 {
1349 srvr_sockaddr_union_t me;
1350 curl_socket_t sock = CURL_SOCKET_BAD;
1351 curl_socket_t msgsock = CURL_SOCKET_BAD;
1352 int wrotepidfile = 0;
1353 int wroteportfile = 0;
1354 const char *pidname = ".sockfilt.pid";
1355 const char *portname = NULL; /* none by default */
1356 bool juggle_again;
1357 int rc;
1358 int error;
1359 int arg = 1;
1360 enum sockmode mode = PASSIVE_LISTEN; /* default */
1361 const char *addr = NULL;
1362
1363 while(argc>arg) {
1364 if(!strcmp("--version", argv[arg])) {
1365 printf("sockfilt IPv4%s\n",
1366 #ifdef USE_IPV6
1367 "/IPv6"
1368 #else
1369 ""
1370 #endif
1371 );
1372 return 0;
1373 }
1374 else if(!strcmp("--verbose", argv[arg])) {
1375 verbose = TRUE;
1376 arg++;
1377 }
1378 else if(!strcmp("--pidfile", argv[arg])) {
1379 arg++;
1380 if(argc>arg)
1381 pidname = argv[arg++];
1382 }
1383 else if(!strcmp("--portfile", argv[arg])) {
1384 arg++;
1385 if(argc > arg)
1386 portname = argv[arg++];
1387 }
1388 else if(!strcmp("--logfile", argv[arg])) {
1389 arg++;
1390 if(argc>arg)
1391 serverlogfile = argv[arg++];
1392 }
1393 else if(!strcmp("--ipv6", argv[arg])) {
1394 #ifdef USE_IPV6
1395 ipv_inuse = "IPv6";
1396 use_ipv6 = TRUE;
1397 #endif
1398 arg++;
1399 }
1400 else if(!strcmp("--ipv4", argv[arg])) {
1401 /* for completeness, we support this option as well */
1402 #ifdef USE_IPV6
1403 ipv_inuse = "IPv4";
1404 use_ipv6 = FALSE;
1405 #endif
1406 arg++;
1407 }
1408 else if(!strcmp("--bindonly", argv[arg])) {
1409 bind_only = TRUE;
1410 arg++;
1411 }
1412 else if(!strcmp("--port", argv[arg])) {
1413 arg++;
1414 if(argc>arg) {
1415 char *endptr;
1416 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1417 port = curlx_ultous(ulnum);
1418 arg++;
1419 }
1420 }
1421 else if(!strcmp("--connect", argv[arg])) {
1422 /* Asked to actively connect to the specified local port instead of
1423 doing a passive server-style listening. */
1424 arg++;
1425 if(argc>arg) {
1426 char *endptr;
1427 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1428 if((endptr != argv[arg] + strlen(argv[arg])) ||
1429 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1430 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1431 argv[arg]);
1432 return 0;
1433 }
1434 connectport = curlx_ultous(ulnum);
1435 arg++;
1436 }
1437 }
1438 else if(!strcmp("--addr", argv[arg])) {
1439 /* Set an IP address to use with --connect; otherwise use localhost */
1440 arg++;
1441 if(argc>arg) {
1442 addr = argv[arg];
1443 arg++;
1444 }
1445 }
1446 else {
1447 puts("Usage: sockfilt [option]\n"
1448 " --version\n"
1449 " --verbose\n"
1450 " --logfile [file]\n"
1451 " --pidfile [file]\n"
1452 " --portfile [file]\n"
1453 " --ipv4\n"
1454 " --ipv6\n"
1455 " --bindonly\n"
1456 " --port [port]\n"
1457 " --connect [port]\n"
1458 " --addr [address]");
1459 return 0;
1460 }
1461 }
1462
1463 #ifdef _WIN32
1464 win32_init();
1465 atexit(win32_cleanup);
1466
1467 setmode(fileno(stdin), O_BINARY);
1468 setmode(fileno(stdout), O_BINARY);
1469 setmode(fileno(stderr), O_BINARY);
1470 #endif
1471
1472 install_signal_handlers(false);
1473
1474 #ifdef USE_IPV6
1475 if(!use_ipv6)
1476 #endif
1477 sock = socket(AF_INET, SOCK_STREAM, 0);
1478 #ifdef USE_IPV6
1479 else
1480 sock = socket(AF_INET6, SOCK_STREAM, 0);
1481 #endif
1482
1483 if(CURL_SOCKET_BAD == sock) {
1484 error = SOCKERRNO;
1485 logmsg("Error creating socket: (%d) %s", error, sstrerror(error));
1486 write_stdout("FAIL\n", 5);
1487 goto sockfilt_cleanup;
1488 }
1489
1490 if(connectport) {
1491 /* Active mode, we should connect to the given port number */
1492 mode = ACTIVE;
1493 #ifdef USE_IPV6
1494 if(!use_ipv6) {
1495 #endif
1496 memset(&me.sa4, 0, sizeof(me.sa4));
1497 me.sa4.sin_family = AF_INET;
1498 me.sa4.sin_port = htons(connectport);
1499 me.sa4.sin_addr.s_addr = INADDR_ANY;
1500 if(!addr)
1501 addr = "127.0.0.1";
1502 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1503
1504 rc = connect(sock, &me.sa, sizeof(me.sa4));
1505 #ifdef USE_IPV6
1506 }
1507 else {
1508 memset(&me.sa6, 0, sizeof(me.sa6));
1509 me.sa6.sin6_family = AF_INET6;
1510 me.sa6.sin6_port = htons(connectport);
1511 if(!addr)
1512 addr = "::1";
1513 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1514
1515 rc = connect(sock, &me.sa, sizeof(me.sa6));
1516 }
1517 #endif /* USE_IPV6 */
1518 if(rc) {
1519 error = SOCKERRNO;
1520 logmsg("Error connecting to port %hu: (%d) %s",
1521 connectport, error, sstrerror(error));
1522 write_stdout("FAIL\n", 5);
1523 goto sockfilt_cleanup;
1524 }
1525 logmsg("====> Client connect");
1526 msgsock = sock; /* use this as stream */
1527 }
1528 else {
1529 /* passive daemon style */
1530 sock = sockdaemon(sock, &port);
1531 if(CURL_SOCKET_BAD == sock) {
1532 write_stdout("FAIL\n", 5);
1533 goto sockfilt_cleanup;
1534 }
1535 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1536 }
1537
1538 logmsg("Running %s version", ipv_inuse);
1539
1540 if(connectport)
1541 logmsg("Connected to port %hu", connectport);
1542 else if(bind_only)
1543 logmsg("Bound without listening on port %hu", port);
1544 else
1545 logmsg("Listening on port %hu", port);
1546
1547 wrotepidfile = write_pidfile(pidname);
1548 if(!wrotepidfile) {
1549 write_stdout("FAIL\n", 5);
1550 goto sockfilt_cleanup;
1551 }
1552 if(portname) {
1553 wroteportfile = write_portfile(portname, port);
1554 if(!wroteportfile) {
1555 write_stdout("FAIL\n", 5);
1556 goto sockfilt_cleanup;
1557 }
1558 }
1559
1560 do {
1561 juggle_again = juggle(&msgsock, sock, &mode);
1562 } while(juggle_again);
1563
1564 sockfilt_cleanup:
1565
1566 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1567 sclose(msgsock);
1568
1569 if(sock != CURL_SOCKET_BAD)
1570 sclose(sock);
1571
1572 if(wrotepidfile)
1573 unlink(pidname);
1574 if(wroteportfile)
1575 unlink(portname);
1576
1577 restore_signal_handlers(false);
1578
1579 if(got_exit_signal) {
1580 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1581 /*
1582 * To properly set the return status of the process we
1583 * must raise the same signal SIGINT or SIGTERM that we
1584 * caught and let the old handler take care of it.
1585 */
1586 raise(exit_signal);
1587 }
1588
1589 logmsg("============> sockfilt quits");
1590 return 0;
1591 }
1592