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 #include "curlx.h" /* from the private lib dir */
103 #include "getpart.h"
104 #include "inet_pton.h"
105 #include "util.h"
106 #include "server_sockaddr.h"
107 #include "timediff.h"
108 #include "warnless.h"
109
110 #include "tool_binmode.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 /* buffer is this excessively large only to be able to support things like
133 test 1003 which tests exceedingly large server response lines */
134 #define BUFFER_SIZE 17010
135
136 const char *serverlogfile = DEFAULT_LOGFILE;
137
138 static bool verbose = FALSE;
139 static bool bind_only = FALSE;
140 #ifdef USE_IPV6
141 static bool use_ipv6 = FALSE;
142 #endif
143 static const char *ipv_inuse = "IPv4";
144 static unsigned short port = DEFAULT_PORT;
145 static unsigned short connectport = 0; /* if non-zero, we activate this mode */
146
147 enum sockmode {
148 PASSIVE_LISTEN, /* as a server waiting for connections */
149 PASSIVE_CONNECT, /* as a server, connected to a client */
150 ACTIVE, /* as a client, connected to a server */
151 ACTIVE_DISCONNECT /* as a client, disconnected from server */
152 };
153
154 #if defined(_WIN32) && !defined(CURL_WINDOWS_UWP)
155 /*
156 * read-wrapper to support reading from stdin on Windows.
157 */
read_wincon(int fd,void * buf,size_t count)158 static ssize_t read_wincon(int fd, void *buf, size_t count)
159 {
160 HANDLE handle = NULL;
161 DWORD mode, rcount = 0;
162 BOOL success;
163
164 if(fd == fileno(stdin)) {
165 handle = GetStdHandle(STD_INPUT_HANDLE);
166 }
167 else {
168 return read(fd, buf, count);
169 }
170
171 if(GetConsoleMode(handle, &mode)) {
172 success = ReadConsole(handle, buf, curlx_uztoul(count), &rcount, NULL);
173 }
174 else {
175 success = ReadFile(handle, buf, curlx_uztoul(count), &rcount, NULL);
176 }
177 if(success) {
178 return rcount;
179 }
180
181 errno = (int)GetLastError();
182 return -1;
183 }
184 #undef read
185 #define read(a,b,c) read_wincon(a,b,c)
186
187 /*
188 * write-wrapper to support writing to stdout and stderr on Windows.
189 */
write_wincon(int fd,const void * buf,size_t count)190 static ssize_t write_wincon(int fd, const void *buf, size_t count)
191 {
192 HANDLE handle = NULL;
193 DWORD mode, wcount = 0;
194 BOOL success;
195
196 if(fd == fileno(stdout)) {
197 handle = GetStdHandle(STD_OUTPUT_HANDLE);
198 }
199 else if(fd == fileno(stderr)) {
200 handle = GetStdHandle(STD_ERROR_HANDLE);
201 }
202 else {
203 return write(fd, buf, count);
204 }
205
206 if(GetConsoleMode(handle, &mode)) {
207 success = WriteConsole(handle, buf, curlx_uztoul(count), &wcount, NULL);
208 }
209 else {
210 success = WriteFile(handle, buf, curlx_uztoul(count), &wcount, NULL);
211 }
212 if(success) {
213 return wcount;
214 }
215
216 errno = (int)GetLastError();
217 return -1;
218 }
219 #undef write
220 #define write(a,b,c) write_wincon(a,b,c)
221 #endif
222
223 /* On Windows, we sometimes get this for a broken pipe, seemingly
224 * when the client just closed stdin? */
225 #define CURL_WIN32_EPIPE 109
226
227 /*
228 * fullread is a wrapper around the read() function. This will repeat the call
229 * to read() until it actually has read the complete number of bytes indicated
230 * in nbytes or it fails with a condition that cannot be handled with a simple
231 * retry of the read call.
232 */
233
fullread(int filedes,void * buffer,size_t nbytes)234 static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
235 {
236 int error;
237 ssize_t nread = 0;
238
239 do {
240 ssize_t rc = read(filedes,
241 (unsigned char *)buffer + nread, nbytes - nread);
242
243 if(got_exit_signal) {
244 logmsg("signalled to die");
245 return -1;
246 }
247
248 if(rc < 0) {
249 error = errno;
250 if((error == EINTR) || (error == EAGAIN))
251 continue;
252 if(error == CURL_WIN32_EPIPE) {
253 logmsg("got Windows ERROR_BROKEN_PIPE on fd=%d, treating as close",
254 filedes);
255 return 0;
256 }
257 logmsg("reading from file descriptor: %d,", filedes);
258 logmsg("unrecoverable read() failure: (%d) %s",
259 error, strerror(error));
260 return -1;
261 }
262
263 if(rc == 0) {
264 logmsg("got 0 reading from stdin");
265 return 0;
266 }
267
268 nread += rc;
269
270 } while((size_t)nread < nbytes);
271
272 if(verbose)
273 logmsg("read %zd bytes", nread);
274
275 return nread;
276 }
277
278 /*
279 * fullwrite is a wrapper around the write() function. This will repeat the
280 * call to write() until it actually has written the complete number of bytes
281 * indicated in nbytes or it fails with a condition that cannot be handled
282 * with a simple retry of the write call.
283 */
284
fullwrite(int filedes,const void * buffer,size_t nbytes)285 static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
286 {
287 int error;
288 ssize_t nwrite = 0;
289
290 do {
291 ssize_t wc = write(filedes, (const unsigned char *)buffer + nwrite,
292 nbytes - nwrite);
293
294 if(got_exit_signal) {
295 logmsg("signalled to die");
296 return -1;
297 }
298
299 if(wc < 0) {
300 error = errno;
301 if((error == EINTR) || (error == EAGAIN))
302 continue;
303 logmsg("writing to file descriptor: %d,", filedes);
304 logmsg("unrecoverable write() failure: (%d) %s",
305 error, strerror(error));
306 return -1;
307 }
308
309 if(wc == 0) {
310 logmsg("put 0 writing to stdout");
311 return 0;
312 }
313
314 nwrite += wc;
315
316 } while((size_t)nwrite < nbytes);
317
318 if(verbose)
319 logmsg("wrote %zd bytes", nwrite);
320
321 return nwrite;
322 }
323
324 /*
325 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
326 * blocking function that will only return TRUE when nbytes have actually been
327 * read or FALSE when an unrecoverable error has been detected. Failure of this
328 * function is an indication that the sockfilt process should terminate.
329 */
330
read_stdin(void * buffer,size_t nbytes)331 static bool read_stdin(void *buffer, size_t nbytes)
332 {
333 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
334 if(nread != (ssize_t)nbytes) {
335 logmsg("exiting...");
336 return FALSE;
337 }
338 return TRUE;
339 }
340
341 /*
342 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
343 * blocking function that will only return TRUE when nbytes have actually been
344 * written or FALSE when an unrecoverable error has been detected. Failure of
345 * this function is an indication that the sockfilt process should terminate.
346 */
347
write_stdout(const void * buffer,size_t nbytes)348 static bool write_stdout(const void *buffer, size_t nbytes)
349 {
350 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
351 if(nwrite != (ssize_t)nbytes) {
352 logmsg("exiting...");
353 return FALSE;
354 }
355 return TRUE;
356 }
357
lograw(unsigned char * buffer,ssize_t len)358 static void lograw(unsigned char *buffer, ssize_t len)
359 {
360 char data[120];
361 ssize_t i;
362 unsigned char *ptr = buffer;
363 char *optr = data;
364 ssize_t width = 0;
365 int left = sizeof(data);
366
367 for(i = 0; i < len; i++) {
368 switch(ptr[i]) {
369 case '\n':
370 msnprintf(optr, left, "\\n");
371 width += 2;
372 optr += 2;
373 left -= 2;
374 break;
375 case '\r':
376 msnprintf(optr, left, "\\r");
377 width += 2;
378 optr += 2;
379 left -= 2;
380 break;
381 default:
382 msnprintf(optr, left, "%c", (ISGRAPH(ptr[i]) ||
383 ptr[i] == 0x20) ? ptr[i] : '.');
384 width++;
385 optr++;
386 left--;
387 break;
388 }
389
390 if(width > 60) {
391 logmsg("'%s'", data);
392 width = 0;
393 optr = data;
394 left = sizeof(data);
395 }
396 }
397 if(width)
398 logmsg("'%s'", data);
399 }
400
401 /*
402 * handle the DATA command
403 * maxlen is the available space in buffer (input)
404 * *buffer_len is the amount of data in the buffer (output)
405 */
read_data_block(unsigned char * buffer,ssize_t maxlen,ssize_t * buffer_len)406 static bool read_data_block(unsigned char *buffer, ssize_t maxlen,
407 ssize_t *buffer_len)
408 {
409 if(!read_stdin(buffer, 5))
410 return FALSE;
411
412 buffer[5] = '\0';
413
414 *buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
415 if(*buffer_len > maxlen) {
416 logmsg("ERROR: Buffer size (%zd bytes) too small for data size "
417 "(%zd bytes)", maxlen, *buffer_len);
418 return FALSE;
419 }
420 logmsg("> %zd bytes data, server => client", *buffer_len);
421
422 if(!read_stdin(buffer, *buffer_len))
423 return FALSE;
424
425 lograw(buffer, *buffer_len);
426
427 return TRUE;
428 }
429
430
431 #if defined(USE_WINSOCK) && !defined(CURL_WINDOWS_UWP)
432 /*
433 * Winsock select() does not support standard file descriptors,
434 * it can only check SOCKETs. The following function is an attempt
435 * to re-create a select() function with support for other handle types.
436 *
437 * select() function with support for Winsock2 sockets and all
438 * other handle types supported by WaitForMultipleObjectsEx() as
439 * well as disk files, anonymous and names pipes, and character input.
440 *
441 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
442 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
443 */
444 struct select_ws_wait_data {
445 HANDLE handle; /* actual handle to wait for during select */
446 HANDLE signal; /* internal event to signal handle trigger */
447 HANDLE abort; /* internal event to abort waiting threads */
448 };
449 #ifdef _WIN32_WCE
select_ws_wait_thread(LPVOID lpParameter)450 static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter)
451 #else
452 #include <process.h>
453 static unsigned int WINAPI select_ws_wait_thread(void *lpParameter)
454 #endif
455 {
456 struct select_ws_wait_data *data;
457 HANDLE signal, handle, handles[2];
458 INPUT_RECORD inputrecord;
459 LARGE_INTEGER size, pos;
460 DWORD type, length, ret;
461
462 /* retrieve handles from internal structure */
463 data = (struct select_ws_wait_data *) lpParameter;
464 if(data) {
465 handle = data->handle;
466 handles[0] = data->abort;
467 handles[1] = handle;
468 signal = data->signal;
469 free(data);
470 }
471 else
472 return (DWORD)-1;
473
474 /* retrieve the type of file to wait on */
475 type = GetFileType(handle);
476 switch(type) {
477 case FILE_TYPE_DISK:
478 /* The handle represents a file on disk, this means:
479 * - WaitForMultipleObjectsEx will always be signalled for it.
480 * - comparison of current position in file and total size of
481 * the file can be used to check if we reached the end yet.
482 *
483 * Approach: Loop till either the internal event is signalled
484 * or if the end of the file has already been reached.
485 */
486 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
487 == WAIT_TIMEOUT) {
488 /* get total size of file */
489 length = 0;
490 size.QuadPart = 0;
491 size.LowPart = GetFileSize(handle, &length);
492 if((size.LowPart != INVALID_FILE_SIZE) ||
493 (GetLastError() == NO_ERROR)) {
494 size.HighPart = (LONG)length;
495 /* get the current position within the file */
496 pos.QuadPart = 0;
497 pos.LowPart = SetFilePointer(handle, 0, &pos.HighPart, FILE_CURRENT);
498 if((pos.LowPart != INVALID_SET_FILE_POINTER) ||
499 (GetLastError() == NO_ERROR)) {
500 /* compare position with size, abort if not equal */
501 if(size.QuadPart == pos.QuadPart) {
502 /* sleep and continue waiting */
503 SleepEx(0, FALSE);
504 continue;
505 }
506 }
507 }
508 /* there is some data available, stop waiting */
509 logmsg("[select_ws_wait_thread] data available, DISK: %p", handle);
510 SetEvent(signal);
511 }
512 break;
513
514 case FILE_TYPE_CHAR:
515 /* The handle represents a character input, this means:
516 * - WaitForMultipleObjectsEx will be signalled on any kind of input,
517 * including mouse and window size events we do not care about.
518 *
519 * Approach: Loop till either the internal event is signalled
520 * or we get signalled for an actual key-event.
521 */
522 while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
523 == WAIT_OBJECT_0 + 1) {
524 /* check if this is an actual console handle */
525 if(GetConsoleMode(handle, &ret)) {
526 /* retrieve an event from the console buffer */
527 length = 0;
528 if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
529 /* check if the event is not an actual key-event */
530 if(length == 1 && inputrecord.EventType != KEY_EVENT) {
531 /* purge the non-key-event and continue waiting */
532 ReadConsoleInput(handle, &inputrecord, 1, &length);
533 continue;
534 }
535 }
536 }
537 /* there is some data available, stop waiting */
538 logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle);
539 SetEvent(signal);
540 }
541 break;
542
543 case FILE_TYPE_PIPE:
544 /* The handle represents an anonymous or named pipe, this means:
545 * - WaitForMultipleObjectsEx will always be signalled for it.
546 * - peek into the pipe and retrieve the amount of data available.
547 *
548 * Approach: Loop till either the internal event is signalled
549 * or there is data in the pipe available for reading.
550 */
551 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
552 == WAIT_TIMEOUT) {
553 /* peek into the pipe and retrieve the amount of data available */
554 length = 0;
555 if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
556 /* if there is no data available, sleep and continue waiting */
557 if(length == 0) {
558 SleepEx(0, FALSE);
559 continue;
560 }
561 else {
562 logmsg("[select_ws_wait_thread] PeekNamedPipe len: %lu", length);
563 }
564 }
565 else {
566 /* if the pipe has NOT been closed, sleep and continue waiting */
567 ret = GetLastError();
568 if(ret != ERROR_BROKEN_PIPE) {
569 logmsg("[select_ws_wait_thread] PeekNamedPipe error: %lu", ret);
570 SleepEx(0, FALSE);
571 continue;
572 }
573 else {
574 logmsg("[select_ws_wait_thread] pipe closed, PIPE: %p", handle);
575 }
576 }
577 /* there is some data available, stop waiting */
578 logmsg("[select_ws_wait_thread] data available, PIPE: %p", handle);
579 SetEvent(signal);
580 }
581 break;
582
583 default:
584 /* The handle has an unknown type, try to wait on it */
585 if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
586 == WAIT_OBJECT_0 + 1) {
587 logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle);
588 SetEvent(signal);
589 }
590 break;
591 }
592
593 return 0;
594 }
select_ws_wait(HANDLE handle,HANDLE signal,HANDLE abort)595 static HANDLE select_ws_wait(HANDLE handle, HANDLE signal, HANDLE abort)
596 {
597 #ifdef _WIN32_WCE
598 typedef HANDLE curl_win_thread_handle_t;
599 #else
600 typedef uintptr_t curl_win_thread_handle_t;
601 #endif
602 struct select_ws_wait_data *data;
603 curl_win_thread_handle_t thread;
604
605 /* allocate internal waiting data structure */
606 data = malloc(sizeof(struct select_ws_wait_data));
607 if(data) {
608 data->handle = handle;
609 data->signal = signal;
610 data->abort = abort;
611
612 /* launch waiting thread */
613 #ifdef _WIN32_WCE
614 thread = CreateThread(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
615 #else
616 thread = _beginthreadex(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
617 #endif
618
619 /* free data if thread failed to launch */
620 if(!thread) {
621 free(data);
622 }
623 return (HANDLE)thread;
624 }
625 return NULL;
626 }
627 struct select_ws_data {
628 int fd; /* provided file descriptor (indexed by nfd) */
629 long wsastate; /* internal pre-select state (indexed by nfd) */
630 curl_socket_t wsasock; /* internal socket handle (indexed by nws) */
631 WSAEVENT wsaevent; /* internal select event (indexed by nws) */
632 HANDLE signal; /* internal thread signal (indexed by nth) */
633 HANDLE thread; /* internal thread handle (indexed by nth) */
634 };
select_ws(int nfds,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct timeval * tv)635 static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
636 fd_set *exceptfds, struct timeval *tv)
637 {
638 DWORD timeout_ms, wait, nfd, nth, nws, i;
639 HANDLE abort, signal, handle, *handles;
640 fd_set readsock, writesock, exceptsock;
641 struct select_ws_data *data;
642 WSANETWORKEVENTS wsaevents;
643 curl_socket_t wsasock;
644 int error, ret, fd;
645 WSAEVENT wsaevent;
646
647 /* check if the input value is valid */
648 if(nfds < 0) {
649 errno = EINVAL;
650 return -1;
651 }
652
653 /* convert struct timeval to milliseconds */
654 if(tv) {
655 timeout_ms = (DWORD)curlx_tvtoms(tv);
656 }
657 else {
658 timeout_ms = INFINITE;
659 }
660
661 /* check if we got descriptors, sleep in case we got none */
662 if(!nfds) {
663 SleepEx(timeout_ms, FALSE);
664 return 0;
665 }
666
667 /* create internal event to abort waiting threads */
668 abort = CreateEvent(NULL, TRUE, FALSE, NULL);
669 if(!abort) {
670 errno = ENOMEM;
671 return -1;
672 }
673
674 /* allocate internal array for the internal data */
675 data = calloc(nfds, sizeof(struct select_ws_data));
676 if(!data) {
677 CloseHandle(abort);
678 errno = ENOMEM;
679 return -1;
680 }
681
682 /* allocate internal array for the internal event handles */
683 handles = calloc(nfds + 1, sizeof(HANDLE));
684 if(!handles) {
685 CloseHandle(abort);
686 free(data);
687 errno = ENOMEM;
688 return -1;
689 }
690
691 /* loop over the handles in the input descriptor sets */
692 nfd = 0; /* number of handled file descriptors */
693 nth = 0; /* number of internal waiting threads */
694 nws = 0; /* number of handled Winsock sockets */
695 for(fd = 0; fd < nfds; fd++) {
696 wsasock = (curl_socket_t)fd;
697 wsaevents.lNetworkEvents = 0;
698 handles[nfd] = 0;
699
700 FD_ZERO(&readsock);
701 FD_ZERO(&writesock);
702 FD_ZERO(&exceptsock);
703
704 if(FD_ISSET(wsasock, readfds)) {
705 FD_SET(wsasock, &readsock);
706 wsaevents.lNetworkEvents |= FD_READ|FD_ACCEPT|FD_CLOSE;
707 }
708
709 if(FD_ISSET(wsasock, writefds)) {
710 FD_SET(wsasock, &writesock);
711 wsaevents.lNetworkEvents |= FD_WRITE|FD_CONNECT|FD_CLOSE;
712 }
713
714 if(FD_ISSET(wsasock, exceptfds)) {
715 FD_SET(wsasock, &exceptsock);
716 wsaevents.lNetworkEvents |= FD_OOB;
717 }
718
719 /* only wait for events for which we actually care */
720 if(wsaevents.lNetworkEvents) {
721 data[nfd].fd = fd;
722 if(fd == fileno(stdin)) {
723 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
724 if(signal) {
725 handle = GetStdHandle(STD_INPUT_HANDLE);
726 handle = select_ws_wait(handle, signal, abort);
727 if(handle) {
728 handles[nfd] = signal;
729 data[nth].signal = signal;
730 data[nth].thread = handle;
731 nfd++;
732 nth++;
733 }
734 else {
735 CloseHandle(signal);
736 }
737 }
738 }
739 else if(fd == fileno(stdout)) {
740 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
741 nfd++;
742 }
743 else if(fd == fileno(stderr)) {
744 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
745 nfd++;
746 }
747 else {
748 wsaevent = WSACreateEvent();
749 if(wsaevent != WSA_INVALID_EVENT) {
750 if(wsaevents.lNetworkEvents & FD_WRITE) {
751 send(wsasock, NULL, 0, 0); /* reset FD_WRITE */
752 }
753 error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
754 if(error != SOCKET_ERROR) {
755 handles[nfd] = (HANDLE)wsaevent;
756 data[nws].wsasock = wsasock;
757 data[nws].wsaevent = wsaevent;
758 data[nfd].wsastate = 0;
759 tv->tv_sec = 0;
760 tv->tv_usec = 0;
761 /* check if the socket is already ready */
762 if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
763 logmsg("[select_ws] socket %d is ready", fd);
764 WSASetEvent(wsaevent);
765 if(FD_ISSET(wsasock, &readsock))
766 data[nfd].wsastate |= FD_READ;
767 if(FD_ISSET(wsasock, &writesock))
768 data[nfd].wsastate |= FD_WRITE;
769 if(FD_ISSET(wsasock, &exceptsock))
770 data[nfd].wsastate |= FD_OOB;
771 }
772 nfd++;
773 nws++;
774 }
775 else {
776 WSACloseEvent(wsaevent);
777 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
778 if(signal) {
779 handle = (HANDLE)wsasock;
780 handle = select_ws_wait(handle, signal, abort);
781 if(handle) {
782 handles[nfd] = signal;
783 data[nth].signal = signal;
784 data[nth].thread = handle;
785 nfd++;
786 nth++;
787 }
788 else {
789 CloseHandle(signal);
790 }
791 }
792 }
793 }
794 }
795 }
796 }
797
798 /* wait on the number of handles */
799 wait = nfd;
800
801 /* make sure we stop waiting on exit signal event */
802 if(exit_event) {
803 /* we allocated handles nfds + 1 for this */
804 handles[nfd] = exit_event;
805 wait += 1;
806 }
807
808 /* wait for one of the internal handles to trigger */
809 wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
810
811 /* signal the abort event handle and join the other waiting threads */
812 SetEvent(abort);
813 for(i = 0; i < nth; i++) {
814 WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
815 CloseHandle(data[i].thread);
816 }
817
818 /* loop over the internal handles returned in the descriptors */
819 ret = 0; /* number of ready file descriptors */
820 for(i = 0; i < nfd; i++) {
821 fd = data[i].fd;
822 handle = handles[i];
823 wsasock = (curl_socket_t)fd;
824
825 /* check if the current internal handle was triggered */
826 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
827 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
828 /* first handle stdin, stdout and stderr */
829 if(fd == fileno(stdin)) {
830 /* stdin is never ready for write or exceptional */
831 FD_CLR(wsasock, writefds);
832 FD_CLR(wsasock, exceptfds);
833 }
834 else if(fd == fileno(stdout) || fd == fileno(stderr)) {
835 /* stdout and stderr are never ready for read or exceptional */
836 FD_CLR(wsasock, readfds);
837 FD_CLR(wsasock, exceptfds);
838 }
839 else {
840 /* try to handle the event with the Winsock2 functions */
841 wsaevents.lNetworkEvents = 0;
842 error = WSAEnumNetworkEvents(wsasock, handle, &wsaevents);
843 if(error != SOCKET_ERROR) {
844 /* merge result from pre-check using select */
845 wsaevents.lNetworkEvents |= data[i].wsastate;
846
847 /* remove from descriptor set if not ready for read/accept/close */
848 if(!(wsaevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
849 FD_CLR(wsasock, readfds);
850
851 /* remove from descriptor set if not ready for write/connect */
852 if(!(wsaevents.lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE)))
853 FD_CLR(wsasock, writefds);
854
855 /* remove from descriptor set if not exceptional */
856 if(!(wsaevents.lNetworkEvents & FD_OOB))
857 FD_CLR(wsasock, exceptfds);
858 }
859 }
860
861 /* check if the event has not been filtered using specific tests */
862 if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
863 FD_ISSET(wsasock, exceptfds)) {
864 ret++;
865 }
866 }
867 else {
868 /* remove from all descriptor sets since this handle did not trigger */
869 FD_CLR(wsasock, readfds);
870 FD_CLR(wsasock, writefds);
871 FD_CLR(wsasock, exceptfds);
872 }
873 }
874
875 for(fd = 0; fd < nfds; fd++) {
876 if(FD_ISSET(fd, readfds))
877 logmsg("[select_ws] %d is readable", fd);
878 if(FD_ISSET(fd, writefds))
879 logmsg("[select_ws] %d is writable", fd);
880 if(FD_ISSET(fd, exceptfds))
881 logmsg("[select_ws] %d is exceptional", fd);
882 }
883
884 for(i = 0; i < nws; i++) {
885 WSAEventSelect(data[i].wsasock, NULL, 0);
886 WSACloseEvent(data[i].wsaevent);
887 }
888
889 for(i = 0; i < nth; i++) {
890 CloseHandle(data[i].signal);
891 }
892 CloseHandle(abort);
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 /* Perform the disconnect handshake with sockfilt
904 * This involves waiting for the disconnect acknowledgment after the DISC
905 * command, while throwing away anything else that might come in before
906 * that.
907 */
disc_handshake(void)908 static bool disc_handshake(void)
909 {
910 if(!write_stdout("DISC\n", 5))
911 return FALSE;
912
913 do {
914 unsigned char buffer[BUFFER_SIZE];
915 ssize_t buffer_len;
916 if(!read_stdin(buffer, 5))
917 return FALSE;
918 logmsg("Received %c%c%c%c (on stdin)",
919 buffer[0], buffer[1], buffer[2], buffer[3]);
920
921 if(!memcmp("ACKD", buffer, 4)) {
922 /* got the ack we were waiting for */
923 break;
924 }
925 else if(!memcmp("DISC", buffer, 4)) {
926 logmsg("Crikey! Client also wants to disconnect");
927 if(!write_stdout("ACKD\n", 5))
928 return FALSE;
929 }
930 else if(!memcmp("DATA", buffer, 4)) {
931 /* We must read more data to stay in sync */
932 logmsg("Throwing away data bytes");
933 if(!read_data_block(buffer, sizeof(buffer), &buffer_len))
934 return FALSE;
935
936 }
937 else if(!memcmp("QUIT", buffer, 4)) {
938 /* just die */
939 logmsg("quits");
940 return FALSE;
941 }
942 else {
943 logmsg("Error: unexpected message; aborting");
944 /*
945 * The only other messages that could occur here are PING and PORT,
946 * and both of them occur at the start of a test when nothing should be
947 * trying to DISC. Therefore, we should not ever get here, but if we
948 * do, it's probably due to some kind of unclean shutdown situation so
949 * us shutting down is what we probably ought to be doing, anyway.
950 */
951 return FALSE;
952 }
953
954 } while(TRUE);
955 return TRUE;
956 }
957
958 /*
959 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
960
961 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
962 accept()
963 */
juggle(curl_socket_t * sockfdp,curl_socket_t listenfd,enum sockmode * mode)964 static bool juggle(curl_socket_t *sockfdp,
965 curl_socket_t listenfd,
966 enum sockmode *mode)
967 {
968 struct timeval timeout;
969 fd_set fds_read;
970 fd_set fds_write;
971 fd_set fds_err;
972 curl_socket_t sockfd = CURL_SOCKET_BAD;
973 int maxfd = -99;
974 ssize_t rc;
975 int error = 0;
976
977 unsigned char buffer[BUFFER_SIZE];
978 char data[16];
979
980 if(got_exit_signal) {
981 logmsg("signalled to die, exiting...");
982 return FALSE;
983 }
984
985 #ifdef HAVE_GETPPID
986 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
987 parent ftpserver process has died without killing its sockfilt children */
988 if(getppid() <= 1) {
989 logmsg("process becomes orphan, exiting");
990 return FALSE;
991 }
992 #endif
993
994 timeout.tv_sec = 120;
995 timeout.tv_usec = 0;
996
997 FD_ZERO(&fds_read);
998 FD_ZERO(&fds_write);
999 FD_ZERO(&fds_err);
1000
1001 #if defined(__DJGPP__)
1002 #pragma GCC diagnostic push
1003 #pragma GCC diagnostic ignored "-Warith-conversion"
1004 #endif
1005 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
1006 #if defined(__DJGPP__)
1007 #pragma GCC diagnostic pop
1008 #endif
1009
1010 switch(*mode) {
1011
1012 case PASSIVE_LISTEN:
1013
1014 /* server mode */
1015 sockfd = listenfd;
1016 /* there's always a socket to wait for */
1017 #if defined(__DJGPP__)
1018 #pragma GCC diagnostic push
1019 #pragma GCC diagnostic ignored "-Warith-conversion"
1020 #endif
1021 FD_SET(sockfd, &fds_read);
1022 #if defined(__DJGPP__)
1023 #pragma GCC diagnostic pop
1024 #endif
1025 maxfd = (int)sockfd;
1026 break;
1027
1028 case PASSIVE_CONNECT:
1029
1030 sockfd = *sockfdp;
1031 if(CURL_SOCKET_BAD == sockfd) {
1032 /* eeek, we are supposedly connected and then this cannot be -1 ! */
1033 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
1034 maxfd = 0; /* stdin */
1035 }
1036 else {
1037 /* there's always a socket to wait for */
1038 #if defined(__DJGPP__)
1039 #pragma GCC diagnostic push
1040 #pragma GCC diagnostic ignored "-Warith-conversion"
1041 #endif
1042 FD_SET(sockfd, &fds_read);
1043 #if defined(__DJGPP__)
1044 #pragma GCC diagnostic pop
1045 #endif
1046 maxfd = (int)sockfd;
1047 }
1048 break;
1049
1050 case ACTIVE:
1051
1052 sockfd = *sockfdp;
1053 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
1054 if(CURL_SOCKET_BAD != sockfd) {
1055 #if defined(__DJGPP__)
1056 #pragma GCC diagnostic push
1057 #pragma GCC diagnostic ignored "-Warith-conversion"
1058 #endif
1059 FD_SET(sockfd, &fds_read);
1060 #if defined(__DJGPP__)
1061 #pragma GCC diagnostic pop
1062 #endif
1063 maxfd = (int)sockfd;
1064 }
1065 else {
1066 logmsg("No socket to read on");
1067 maxfd = 0;
1068 }
1069 break;
1070
1071 case ACTIVE_DISCONNECT:
1072
1073 logmsg("disconnected, no socket to read on");
1074 maxfd = 0;
1075 sockfd = CURL_SOCKET_BAD;
1076 break;
1077
1078 } /* switch(*mode) */
1079
1080
1081 do {
1082
1083 /* select() blocking behavior call on blocking descriptors please */
1084
1085 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
1086
1087 if(got_exit_signal) {
1088 logmsg("signalled to die, exiting...");
1089 return FALSE;
1090 }
1091
1092 } while((rc == -1) && ((error = errno) == EINTR));
1093
1094 if(rc < 0) {
1095 logmsg("select() failed with error: (%d) %s",
1096 error, strerror(error));
1097 return FALSE;
1098 }
1099
1100 if(rc == 0)
1101 /* timeout */
1102 return TRUE;
1103
1104
1105 if(FD_ISSET(fileno(stdin), &fds_read)) {
1106 ssize_t buffer_len;
1107 /* read from stdin, commands/data to be dealt with and possibly passed on
1108 to the socket
1109
1110 protocol:
1111
1112 4 letter command + LF [mandatory]
1113
1114 4-digit hexadecimal data length + LF [if the command takes data]
1115 data [the data being as long as set above]
1116
1117 Commands:
1118
1119 DATA - plain pass-through data
1120 */
1121
1122 if(!read_stdin(buffer, 5))
1123 return FALSE;
1124
1125 logmsg("Received %c%c%c%c (on stdin)",
1126 buffer[0], buffer[1], buffer[2], buffer[3]);
1127
1128 if(!memcmp("PING", buffer, 4)) {
1129 /* send reply on stdout, just proving we are alive */
1130 if(!write_stdout("PONG\n", 5))
1131 return FALSE;
1132 }
1133
1134 else if(!memcmp("PORT", buffer, 4)) {
1135 /* Question asking us what PORT number we are listening to.
1136 Replies to PORT with "IPv[num]/[port]" */
1137 msnprintf((char *)buffer, sizeof(buffer), "%s/%hu\n", ipv_inuse, port);
1138 buffer_len = (ssize_t)strlen((char *)buffer);
1139 msnprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
1140 if(!write_stdout(data, 10))
1141 return FALSE;
1142 if(!write_stdout(buffer, buffer_len))
1143 return FALSE;
1144 }
1145 else if(!memcmp("QUIT", buffer, 4)) {
1146 /* just die */
1147 logmsg("quits");
1148 return FALSE;
1149 }
1150 else if(!memcmp("DATA", buffer, 4)) {
1151 /* data IN => data OUT */
1152 if(!read_data_block(buffer, sizeof(buffer), &buffer_len))
1153 return FALSE;
1154
1155 if(*mode == PASSIVE_LISTEN) {
1156 logmsg("*** We are disconnected!");
1157 if(!disc_handshake())
1158 return FALSE;
1159 }
1160 else {
1161 /* send away on the socket */
1162 ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
1163 if(bytes_written != buffer_len) {
1164 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
1165 buffer_len, bytes_written);
1166 }
1167 }
1168 }
1169 else if(!memcmp("DISC", buffer, 4)) {
1170 /* disconnect! */
1171 if(!write_stdout("ACKD\n", 5))
1172 return FALSE;
1173 if(sockfd != CURL_SOCKET_BAD) {
1174 logmsg("====> Client forcibly disconnected");
1175 sclose(sockfd);
1176 *sockfdp = CURL_SOCKET_BAD;
1177 if(*mode == PASSIVE_CONNECT)
1178 *mode = PASSIVE_LISTEN;
1179 else
1180 *mode = ACTIVE_DISCONNECT;
1181 }
1182 else
1183 logmsg("attempt to close already dead connection");
1184 return TRUE;
1185 }
1186 }
1187
1188
1189 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
1190 ssize_t nread_socket;
1191 if(*mode == PASSIVE_LISTEN) {
1192 /* there's no stream set up yet, this is an indication that there's a
1193 client connecting. */
1194 curl_socket_t newfd = accept(sockfd, NULL, NULL);
1195 if(CURL_SOCKET_BAD == newfd) {
1196 error = SOCKERRNO;
1197 logmsg("accept(%" FMT_SOCKET_T ", NULL, NULL) "
1198 "failed with error: (%d) %s", sockfd, error, sstrerror(error));
1199 }
1200 else {
1201 logmsg("====> Client connect");
1202 if(!write_stdout("CNCT\n", 5))
1203 return FALSE;
1204 *sockfdp = newfd; /* store the new socket */
1205 *mode = PASSIVE_CONNECT; /* we have connected */
1206 }
1207 return TRUE;
1208 }
1209
1210 /* read from socket, pass on data to stdout */
1211 nread_socket = sread(sockfd, buffer, sizeof(buffer));
1212
1213 if(nread_socket > 0) {
1214 msnprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
1215 if(!write_stdout(data, 10))
1216 return FALSE;
1217 if(!write_stdout(buffer, nread_socket))
1218 return FALSE;
1219
1220 logmsg("< %zd bytes data, client => server", nread_socket);
1221 lograw(buffer, nread_socket);
1222 }
1223
1224 if(nread_socket <= 0) {
1225 logmsg("====> Client disconnect");
1226 if(!disc_handshake())
1227 return FALSE;
1228 sclose(sockfd);
1229 *sockfdp = CURL_SOCKET_BAD;
1230 if(*mode == PASSIVE_CONNECT)
1231 *mode = PASSIVE_LISTEN;
1232 else
1233 *mode = ACTIVE_DISCONNECT;
1234 return TRUE;
1235 }
1236 }
1237
1238 return TRUE;
1239 }
1240
sockdaemon(curl_socket_t sock,unsigned short * listenport)1241 static curl_socket_t sockdaemon(curl_socket_t sock,
1242 unsigned short *listenport)
1243 {
1244 /* passive daemon style */
1245 srvr_sockaddr_union_t listener;
1246 int flag;
1247 int rc;
1248 int totdelay = 0;
1249 int maxretr = 10;
1250 int delay = 20;
1251 int attempt = 0;
1252 int error = 0;
1253
1254 do {
1255 attempt++;
1256 flag = 1;
1257 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1258 (void *)&flag, sizeof(flag));
1259 if(rc) {
1260 error = SOCKERRNO;
1261 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
1262 error, sstrerror(error));
1263 if(maxretr) {
1264 rc = wait_ms(delay);
1265 if(rc) {
1266 /* should not happen */
1267 error = errno;
1268 logmsg("wait_ms() failed with error: (%d) %s",
1269 error, strerror(error));
1270 sclose(sock);
1271 return CURL_SOCKET_BAD;
1272 }
1273 if(got_exit_signal) {
1274 logmsg("signalled to die, exiting...");
1275 sclose(sock);
1276 return CURL_SOCKET_BAD;
1277 }
1278 totdelay += delay;
1279 delay *= 2; /* double the sleep for next attempt */
1280 }
1281 }
1282 } while(rc && maxretr--);
1283
1284 if(rc) {
1285 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
1286 attempt, totdelay, error, strerror(error));
1287 logmsg("Continuing anyway...");
1288 }
1289
1290 /* When the specified listener port is zero, it is actually a
1291 request to let the system choose a non-zero available port. */
1292
1293 #ifdef USE_IPV6
1294 if(!use_ipv6) {
1295 #endif
1296 memset(&listener.sa4, 0, sizeof(listener.sa4));
1297 listener.sa4.sin_family = AF_INET;
1298 listener.sa4.sin_addr.s_addr = INADDR_ANY;
1299 listener.sa4.sin_port = htons(*listenport);
1300 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
1301 #ifdef USE_IPV6
1302 }
1303 else {
1304 memset(&listener.sa6, 0, sizeof(listener.sa6));
1305 listener.sa6.sin6_family = AF_INET6;
1306 listener.sa6.sin6_addr = in6addr_any;
1307 listener.sa6.sin6_port = htons(*listenport);
1308 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1309 }
1310 #endif /* USE_IPV6 */
1311 if(rc) {
1312 error = SOCKERRNO;
1313 logmsg("Error binding socket on port %hu: (%d) %s",
1314 *listenport, error, sstrerror(error));
1315 sclose(sock);
1316 return CURL_SOCKET_BAD;
1317 }
1318
1319 if(!*listenport) {
1320 /* The system was supposed to choose a port number, figure out which
1321 port we actually got and update the listener port value with it. */
1322 curl_socklen_t la_size;
1323 srvr_sockaddr_union_t localaddr;
1324 #ifdef USE_IPV6
1325 if(!use_ipv6)
1326 #endif
1327 la_size = sizeof(localaddr.sa4);
1328 #ifdef USE_IPV6
1329 else
1330 la_size = sizeof(localaddr.sa6);
1331 #endif
1332 memset(&localaddr.sa, 0, (size_t)la_size);
1333 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1334 error = SOCKERRNO;
1335 logmsg("getsockname() failed with error: (%d) %s",
1336 error, sstrerror(error));
1337 sclose(sock);
1338 return CURL_SOCKET_BAD;
1339 }
1340 switch(localaddr.sa.sa_family) {
1341 case AF_INET:
1342 *listenport = ntohs(localaddr.sa4.sin_port);
1343 break;
1344 #ifdef USE_IPV6
1345 case AF_INET6:
1346 *listenport = ntohs(localaddr.sa6.sin6_port);
1347 break;
1348 #endif
1349 default:
1350 break;
1351 }
1352 if(!*listenport) {
1353 /* Real failure, listener port shall not be zero beyond this point. */
1354 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1355 logmsg("A valid reason for this failure is a binary built without");
1356 logmsg("proper network library linkage. This might not be the only");
1357 logmsg("reason, but double check it before anything else.");
1358 sclose(sock);
1359 return CURL_SOCKET_BAD;
1360 }
1361 }
1362
1363 /* bindonly option forces no listening */
1364 if(bind_only) {
1365 logmsg("instructed to bind port without listening");
1366 return sock;
1367 }
1368
1369 /* start accepting connections */
1370 rc = listen(sock, 5);
1371 if(0 != rc) {
1372 error = SOCKERRNO;
1373 logmsg("listen(%" FMT_SOCKET_T ", 5) failed with error: (%d) %s",
1374 sock, error, sstrerror(error));
1375 sclose(sock);
1376 return CURL_SOCKET_BAD;
1377 }
1378
1379 return sock;
1380 }
1381
1382
main(int argc,char * argv[])1383 int main(int argc, char *argv[])
1384 {
1385 srvr_sockaddr_union_t me;
1386 curl_socket_t sock = CURL_SOCKET_BAD;
1387 curl_socket_t msgsock = CURL_SOCKET_BAD;
1388 int wrotepidfile = 0;
1389 int wroteportfile = 0;
1390 const char *pidname = ".sockfilt.pid";
1391 const char *portname = NULL; /* none by default */
1392 bool juggle_again;
1393 int rc;
1394 int error;
1395 int arg = 1;
1396 enum sockmode mode = PASSIVE_LISTEN; /* default */
1397 const char *addr = NULL;
1398
1399 while(argc > arg) {
1400 if(!strcmp("--version", argv[arg])) {
1401 printf("sockfilt IPv4%s\n",
1402 #ifdef USE_IPV6
1403 "/IPv6"
1404 #else
1405 ""
1406 #endif
1407 );
1408 return 0;
1409 }
1410 else if(!strcmp("--verbose", argv[arg])) {
1411 verbose = TRUE;
1412 arg++;
1413 }
1414 else if(!strcmp("--pidfile", argv[arg])) {
1415 arg++;
1416 if(argc > arg)
1417 pidname = argv[arg++];
1418 }
1419 else if(!strcmp("--portfile", argv[arg])) {
1420 arg++;
1421 if(argc > arg)
1422 portname = argv[arg++];
1423 }
1424 else if(!strcmp("--logfile", argv[arg])) {
1425 arg++;
1426 if(argc > arg)
1427 serverlogfile = argv[arg++];
1428 }
1429 else if(!strcmp("--ipv6", argv[arg])) {
1430 #ifdef USE_IPV6
1431 ipv_inuse = "IPv6";
1432 use_ipv6 = TRUE;
1433 #endif
1434 arg++;
1435 }
1436 else if(!strcmp("--ipv4", argv[arg])) {
1437 /* for completeness, we support this option as well */
1438 #ifdef USE_IPV6
1439 ipv_inuse = "IPv4";
1440 use_ipv6 = FALSE;
1441 #endif
1442 arg++;
1443 }
1444 else if(!strcmp("--bindonly", argv[arg])) {
1445 bind_only = TRUE;
1446 arg++;
1447 }
1448 else if(!strcmp("--port", argv[arg])) {
1449 arg++;
1450 if(argc > arg) {
1451 char *endptr;
1452 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1453 port = curlx_ultous(ulnum);
1454 arg++;
1455 }
1456 }
1457 else if(!strcmp("--connect", argv[arg])) {
1458 /* Asked to actively connect to the specified local port instead of
1459 doing a passive server-style listening. */
1460 arg++;
1461 if(argc > arg) {
1462 char *endptr;
1463 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1464 if((endptr != argv[arg] + strlen(argv[arg])) ||
1465 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1466 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1467 argv[arg]);
1468 return 0;
1469 }
1470 connectport = curlx_ultous(ulnum);
1471 arg++;
1472 }
1473 }
1474 else if(!strcmp("--addr", argv[arg])) {
1475 /* Set an IP address to use with --connect; otherwise use localhost */
1476 arg++;
1477 if(argc > arg) {
1478 addr = argv[arg];
1479 arg++;
1480 }
1481 }
1482 else {
1483 puts("Usage: sockfilt [option]\n"
1484 " --version\n"
1485 " --verbose\n"
1486 " --logfile [file]\n"
1487 " --pidfile [file]\n"
1488 " --portfile [file]\n"
1489 " --ipv4\n"
1490 " --ipv6\n"
1491 " --bindonly\n"
1492 " --port [port]\n"
1493 " --connect [port]\n"
1494 " --addr [address]");
1495 return 0;
1496 }
1497 }
1498
1499 #ifdef _WIN32
1500 win32_init();
1501 atexit(win32_cleanup);
1502 #endif
1503
1504 CURL_SET_BINMODE(stdin);
1505 CURL_SET_BINMODE(stdout);
1506 CURL_SET_BINMODE(stderr);
1507
1508 install_signal_handlers(false);
1509
1510 #ifdef USE_IPV6
1511 if(!use_ipv6)
1512 #endif
1513 sock = socket(AF_INET, SOCK_STREAM, 0);
1514 #ifdef USE_IPV6
1515 else
1516 sock = socket(AF_INET6, SOCK_STREAM, 0);
1517 #endif
1518
1519 if(CURL_SOCKET_BAD == sock) {
1520 error = SOCKERRNO;
1521 logmsg("Error creating socket: (%d) %s", error, sstrerror(error));
1522 write_stdout("FAIL\n", 5);
1523 goto sockfilt_cleanup;
1524 }
1525
1526 if(connectport) {
1527 /* Active mode, we should connect to the given port number */
1528 mode = ACTIVE;
1529 #ifdef USE_IPV6
1530 if(!use_ipv6) {
1531 #endif
1532 memset(&me.sa4, 0, sizeof(me.sa4));
1533 me.sa4.sin_family = AF_INET;
1534 me.sa4.sin_port = htons(connectport);
1535 me.sa4.sin_addr.s_addr = INADDR_ANY;
1536 if(!addr)
1537 addr = "127.0.0.1";
1538 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1539
1540 rc = connect(sock, &me.sa, sizeof(me.sa4));
1541 #ifdef USE_IPV6
1542 }
1543 else {
1544 memset(&me.sa6, 0, sizeof(me.sa6));
1545 me.sa6.sin6_family = AF_INET6;
1546 me.sa6.sin6_port = htons(connectport);
1547 if(!addr)
1548 addr = "::1";
1549 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1550
1551 rc = connect(sock, &me.sa, sizeof(me.sa6));
1552 }
1553 #endif /* USE_IPV6 */
1554 if(rc) {
1555 error = SOCKERRNO;
1556 logmsg("Error connecting to port %hu: (%d) %s",
1557 connectport, error, sstrerror(error));
1558 write_stdout("FAIL\n", 5);
1559 goto sockfilt_cleanup;
1560 }
1561 logmsg("====> Client connect");
1562 msgsock = sock; /* use this as stream */
1563 }
1564 else {
1565 /* passive daemon style */
1566 sock = sockdaemon(sock, &port);
1567 if(CURL_SOCKET_BAD == sock) {
1568 write_stdout("FAIL\n", 5);
1569 goto sockfilt_cleanup;
1570 }
1571 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1572 }
1573
1574 logmsg("Running %s version", ipv_inuse);
1575
1576 if(connectport)
1577 logmsg("Connected to port %hu", connectport);
1578 else if(bind_only)
1579 logmsg("Bound without listening on port %hu", port);
1580 else
1581 logmsg("Listening on port %hu", port);
1582
1583 wrotepidfile = write_pidfile(pidname);
1584 if(!wrotepidfile) {
1585 write_stdout("FAIL\n", 5);
1586 goto sockfilt_cleanup;
1587 }
1588 if(portname) {
1589 wroteportfile = write_portfile(portname, port);
1590 if(!wroteportfile) {
1591 write_stdout("FAIL\n", 5);
1592 goto sockfilt_cleanup;
1593 }
1594 }
1595
1596 do {
1597 juggle_again = juggle(&msgsock, sock, &mode);
1598 } while(juggle_again);
1599
1600 sockfilt_cleanup:
1601
1602 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1603 sclose(msgsock);
1604
1605 if(sock != CURL_SOCKET_BAD)
1606 sclose(sock);
1607
1608 if(wrotepidfile)
1609 unlink(pidname);
1610 if(wroteportfile)
1611 unlink(portname);
1612
1613 restore_signal_handlers(false);
1614
1615 if(got_exit_signal) {
1616 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1617 /*
1618 * To properly set the return status of the process we
1619 * must raise the same signal SIGINT or SIGTERM that we
1620 * caught and let the old handler take care of it.
1621 */
1622 raise(exit_signal);
1623 }
1624
1625 logmsg("============> sockfilt quits");
1626 return 0;
1627 }
1628
