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 #ifdef HAVE_SIGNAL_H
89 #include <signal.h>
90 #endif
91 #ifdef HAVE_NETINET_IN_H
92 #include <netinet/in.h>
93 #endif
94 #ifdef HAVE_NETINET_IN6_H
95 #include <netinet/in6.h>
96 #endif
97 #ifdef HAVE_ARPA_INET_H
98 #include <arpa/inet.h>
99 #endif
100 #ifdef HAVE_NETDB_H
101 #include <netdb.h>
102 #endif
103
104 #define ENABLE_CURLX_PRINTF
105 /* make the curlx header define all printf() functions to use the curlx_*
106 versions instead */
107 #include "curlx.h" /* from the private lib dir */
108 #include "getpart.h"
109 #include "inet_pton.h"
110 #include "util.h"
111 #include "server_sockaddr.h"
112 #include "timediff.h"
113 #include "warnless.h"
114
115 /* include memdebug.h last */
116 #include "memdebug.h"
117
118 #ifdef USE_WINSOCK
119 #undef EINTR
120 #define EINTR 4 /* errno.h value */
121 #undef EAGAIN
122 #define EAGAIN 11 /* errno.h value */
123 #undef ENOMEM
124 #define ENOMEM 12 /* errno.h value */
125 #undef EINVAL
126 #define EINVAL 22 /* errno.h value */
127 #endif
128
129 #define DEFAULT_PORT 8999
130
131 #ifndef DEFAULT_LOGFILE
132 #define DEFAULT_LOGFILE "log/sockfilt.log"
133 #endif
134
135 const char *serverlogfile = DEFAULT_LOGFILE;
136
137 static bool verbose = FALSE;
138 static bool bind_only = FALSE;
139 #ifdef ENABLE_IPV6
140 static bool use_ipv6 = FALSE;
141 #endif
142 static const char *ipv_inuse = "IPv4";
143 static unsigned short port = DEFAULT_PORT;
144 static unsigned short connectport = 0; /* if non-zero, we activate this mode */
145
146 enum sockmode {
147 PASSIVE_LISTEN, /* as a server waiting for connections */
148 PASSIVE_CONNECT, /* as a server, connected to a client */
149 ACTIVE, /* as a client, connected to a server */
150 ACTIVE_DISCONNECT /* as a client, disconnected from server */
151 };
152
153 #ifdef WIN32
154 /*
155 * read-wrapper to support reading from stdin on Windows.
156 */
read_wincon(int fd,void * buf,size_t count)157 static ssize_t read_wincon(int fd, void *buf, size_t count)
158 {
159 HANDLE handle = NULL;
160 DWORD mode, rcount = 0;
161 BOOL success;
162
163 if(fd == fileno(stdin)) {
164 handle = GetStdHandle(STD_INPUT_HANDLE);
165 }
166 else {
167 return read(fd, buf, count);
168 }
169
170 if(GetConsoleMode(handle, &mode)) {
171 success = ReadConsole(handle, buf, curlx_uztoul(count), &rcount, NULL);
172 }
173 else {
174 success = ReadFile(handle, buf, curlx_uztoul(count), &rcount, NULL);
175 }
176 if(success) {
177 return rcount;
178 }
179
180 errno = GetLastError();
181 return -1;
182 }
183 #undef read
184 #define read(a,b,c) read_wincon(a,b,c)
185
186 /*
187 * write-wrapper to support writing to stdout and stderr on Windows.
188 */
write_wincon(int fd,const void * buf,size_t count)189 static ssize_t write_wincon(int fd, const void *buf, size_t count)
190 {
191 HANDLE handle = NULL;
192 DWORD mode, wcount = 0;
193 BOOL success;
194
195 if(fd == fileno(stdout)) {
196 handle = GetStdHandle(STD_OUTPUT_HANDLE);
197 }
198 else if(fd == fileno(stderr)) {
199 handle = GetStdHandle(STD_ERROR_HANDLE);
200 }
201 else {
202 return write(fd, buf, count);
203 }
204
205 if(GetConsoleMode(handle, &mode)) {
206 success = WriteConsole(handle, buf, curlx_uztoul(count), &wcount, NULL);
207 }
208 else {
209 success = WriteFile(handle, buf, curlx_uztoul(count), &wcount, NULL);
210 }
211 if(success) {
212 return wcount;
213 }
214
215 errno = GetLastError();
216 return -1;
217 }
218 #undef write
219 #define write(a,b,c) write_wincon(a,b,c)
220 #endif
221
222 /*
223 * fullread is a wrapper around the read() function. This will repeat the call
224 * to read() until it actually has read the complete number of bytes indicated
225 * in nbytes or it fails with a condition that cannot be handled with a simple
226 * retry of the read call.
227 */
228
fullread(int filedes,void * buffer,size_t nbytes)229 static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
230 {
231 int error;
232 ssize_t nread = 0;
233
234 do {
235 ssize_t rc = read(filedes,
236 (unsigned char *)buffer + nread, nbytes - nread);
237
238 if(got_exit_signal) {
239 logmsg("signalled to die");
240 return -1;
241 }
242
243 if(rc < 0) {
244 error = errno;
245 if((error == EINTR) || (error == EAGAIN))
246 continue;
247 logmsg("reading from file descriptor: %d,", filedes);
248 logmsg("unrecoverable read() failure: (%d) %s",
249 error, strerror(error));
250 return -1;
251 }
252
253 if(rc == 0) {
254 logmsg("got 0 reading from stdin");
255 return 0;
256 }
257
258 nread += rc;
259
260 } while((size_t)nread < nbytes);
261
262 if(verbose)
263 logmsg("read %zd bytes", nread);
264
265 return nread;
266 }
267
268 /*
269 * fullwrite is a wrapper around the write() function. This will repeat the
270 * call to write() until it actually has written the complete number of bytes
271 * indicated in nbytes or it fails with a condition that cannot be handled
272 * with a simple retry of the write call.
273 */
274
fullwrite(int filedes,const void * buffer,size_t nbytes)275 static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
276 {
277 int error;
278 ssize_t nwrite = 0;
279
280 do {
281 ssize_t wc = write(filedes, (const unsigned char *)buffer + nwrite,
282 nbytes - nwrite);
283
284 if(got_exit_signal) {
285 logmsg("signalled to die");
286 return -1;
287 }
288
289 if(wc < 0) {
290 error = errno;
291 if((error == EINTR) || (error == EAGAIN))
292 continue;
293 logmsg("writing to file descriptor: %d,", filedes);
294 logmsg("unrecoverable write() failure: (%d) %s",
295 error, strerror(error));
296 return -1;
297 }
298
299 if(wc == 0) {
300 logmsg("put 0 writing to stdout");
301 return 0;
302 }
303
304 nwrite += wc;
305
306 } while((size_t)nwrite < nbytes);
307
308 if(verbose)
309 logmsg("wrote %zd bytes", nwrite);
310
311 return nwrite;
312 }
313
314 /*
315 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
316 * blocking function that will only return TRUE when nbytes have actually been
317 * read or FALSE when an unrecoverable error has been detected. Failure of this
318 * function is an indication that the sockfilt process should terminate.
319 */
320
read_stdin(void * buffer,size_t nbytes)321 static bool read_stdin(void *buffer, size_t nbytes)
322 {
323 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
324 if(nread != (ssize_t)nbytes) {
325 logmsg("exiting...");
326 return FALSE;
327 }
328 return TRUE;
329 }
330
331 /*
332 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
333 * blocking function that will only return TRUE when nbytes have actually been
334 * written or FALSE when an unrecoverable error has been detected. Failure of
335 * this function is an indication that the sockfilt process should terminate.
336 */
337
write_stdout(const void * buffer,size_t nbytes)338 static bool write_stdout(const void *buffer, size_t nbytes)
339 {
340 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
341 if(nwrite != (ssize_t)nbytes) {
342 logmsg("exiting...");
343 return FALSE;
344 }
345 return TRUE;
346 }
347
lograw(unsigned char * buffer,ssize_t len)348 static void lograw(unsigned char *buffer, ssize_t len)
349 {
350 char data[120];
351 ssize_t i;
352 unsigned char *ptr = buffer;
353 char *optr = data;
354 ssize_t width = 0;
355 int left = sizeof(data);
356
357 for(i = 0; i<len; i++) {
358 switch(ptr[i]) {
359 case '\n':
360 msnprintf(optr, left, "\\n");
361 width += 2;
362 optr += 2;
363 left -= 2;
364 break;
365 case '\r':
366 msnprintf(optr, left, "\\r");
367 width += 2;
368 optr += 2;
369 left -= 2;
370 break;
371 default:
372 msnprintf(optr, left, "%c", (ISGRAPH(ptr[i]) ||
373 ptr[i] == 0x20) ?ptr[i]:'.');
374 width++;
375 optr++;
376 left--;
377 break;
378 }
379
380 if(width>60) {
381 logmsg("'%s'", data);
382 width = 0;
383 optr = data;
384 left = sizeof(data);
385 }
386 }
387 if(width)
388 logmsg("'%s'", data);
389 }
390
391 #ifdef USE_WINSOCK
392 /*
393 * WinSock select() does not support standard file descriptors,
394 * it can only check SOCKETs. The following function is an attempt
395 * to re-create a select() function with support for other handle types.
396 *
397 * select() function with support for WINSOCK2 sockets and all
398 * other handle types supported by WaitForMultipleObjectsEx() as
399 * well as disk files, anonymous and names pipes, and character input.
400 *
401 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
402 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
403 */
404 struct select_ws_wait_data {
405 HANDLE handle; /* actual handle to wait for during select */
406 HANDLE signal; /* internal event to signal handle trigger */
407 HANDLE abort; /* internal event to abort waiting threads */
408 };
409 #ifdef _WIN32_WCE
select_ws_wait_thread(LPVOID lpParameter)410 static DWORD WINAPI select_ws_wait_thread(LPVOID lpParameter)
411 #else
412 #include <process.h>
413 static unsigned int WINAPI select_ws_wait_thread(void *lpParameter)
414 #endif
415 {
416 struct select_ws_wait_data *data;
417 HANDLE signal, handle, handles[2];
418 INPUT_RECORD inputrecord;
419 LARGE_INTEGER size, pos;
420 DWORD type, length, ret;
421
422 /* retrieve handles from internal structure */
423 data = (struct select_ws_wait_data *) lpParameter;
424 if(data) {
425 handle = data->handle;
426 handles[0] = data->abort;
427 handles[1] = handle;
428 signal = data->signal;
429 free(data);
430 }
431 else
432 return (DWORD)-1;
433
434 /* retrieve the type of file to wait on */
435 type = GetFileType(handle);
436 switch(type) {
437 case FILE_TYPE_DISK:
438 /* The handle represents a file on disk, this means:
439 * - WaitForMultipleObjectsEx will always be signalled for it.
440 * - comparison of current position in file and total size of
441 * the file can be used to check if we reached the end yet.
442 *
443 * Approach: Loop till either the internal event is signalled
444 * or if the end of the file has already been reached.
445 */
446 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
447 == WAIT_TIMEOUT) {
448 /* get total size of file */
449 length = 0;
450 size.QuadPart = 0;
451 size.LowPart = GetFileSize(handle, &length);
452 if((size.LowPart != INVALID_FILE_SIZE) ||
453 (GetLastError() == NO_ERROR)) {
454 size.HighPart = length;
455 /* get the current position within the file */
456 pos.QuadPart = 0;
457 pos.LowPart = SetFilePointer(handle, 0, &pos.HighPart, FILE_CURRENT);
458 if((pos.LowPart != INVALID_SET_FILE_POINTER) ||
459 (GetLastError() == NO_ERROR)) {
460 /* compare position with size, abort if not equal */
461 if(size.QuadPart == pos.QuadPart) {
462 /* sleep and continue waiting */
463 SleepEx(0, FALSE);
464 continue;
465 }
466 }
467 }
468 /* there is some data available, stop waiting */
469 logmsg("[select_ws_wait_thread] data available, DISK: %p", handle);
470 SetEvent(signal);
471 }
472 break;
473
474 case FILE_TYPE_CHAR:
475 /* The handle represents a character input, this means:
476 * - WaitForMultipleObjectsEx will be signalled on any kind of input,
477 * including mouse and window size events we do not care about.
478 *
479 * Approach: Loop till either the internal event is signalled
480 * or we get signalled for an actual key-event.
481 */
482 while(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
483 == WAIT_OBJECT_0 + 1) {
484 /* check if this is an actual console handle */
485 if(GetConsoleMode(handle, &ret)) {
486 /* retrieve an event from the console buffer */
487 length = 0;
488 if(PeekConsoleInput(handle, &inputrecord, 1, &length)) {
489 /* check if the event is not an actual key-event */
490 if(length == 1 && inputrecord.EventType != KEY_EVENT) {
491 /* purge the non-key-event and continue waiting */
492 ReadConsoleInput(handle, &inputrecord, 1, &length);
493 continue;
494 }
495 }
496 }
497 /* there is some data available, stop waiting */
498 logmsg("[select_ws_wait_thread] data available, CHAR: %p", handle);
499 SetEvent(signal);
500 }
501 break;
502
503 case FILE_TYPE_PIPE:
504 /* The handle represents an anonymous or named pipe, this means:
505 * - WaitForMultipleObjectsEx will always be signalled for it.
506 * - peek into the pipe and retrieve the amount of data available.
507 *
508 * Approach: Loop till either the internal event is signalled
509 * or there is data in the pipe available for reading.
510 */
511 while(WaitForMultipleObjectsEx(1, handles, FALSE, 0, FALSE)
512 == WAIT_TIMEOUT) {
513 /* peek into the pipe and retrieve the amount of data available */
514 length = 0;
515 if(PeekNamedPipe(handle, NULL, 0, NULL, &length, NULL)) {
516 /* if there is no data available, sleep and continue waiting */
517 if(length == 0) {
518 SleepEx(0, FALSE);
519 continue;
520 }
521 else {
522 logmsg("[select_ws_wait_thread] PeekNamedPipe len: %d", length);
523 }
524 }
525 else {
526 /* if the pipe has NOT been closed, sleep and continue waiting */
527 ret = GetLastError();
528 if(ret != ERROR_BROKEN_PIPE) {
529 logmsg("[select_ws_wait_thread] PeekNamedPipe error: %d", ret);
530 SleepEx(0, FALSE);
531 continue;
532 }
533 else {
534 logmsg("[select_ws_wait_thread] pipe closed, PIPE: %p", handle);
535 }
536 }
537 /* there is some data available, stop waiting */
538 logmsg("[select_ws_wait_thread] data available, PIPE: %p", handle);
539 SetEvent(signal);
540 }
541 break;
542
543 default:
544 /* The handle has an unknown type, try to wait on it */
545 if(WaitForMultipleObjectsEx(2, handles, FALSE, INFINITE, FALSE)
546 == WAIT_OBJECT_0 + 1) {
547 logmsg("[select_ws_wait_thread] data available, HANDLE: %p", handle);
548 SetEvent(signal);
549 }
550 break;
551 }
552
553 return 0;
554 }
select_ws_wait(HANDLE handle,HANDLE signal,HANDLE abort)555 static HANDLE select_ws_wait(HANDLE handle, HANDLE signal, HANDLE abort)
556 {
557 #ifdef _WIN32_WCE
558 typedef HANDLE curl_win_thread_handle_t;
559 #elif defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR)
560 typedef unsigned long curl_win_thread_handle_t;
561 #else
562 typedef uintptr_t curl_win_thread_handle_t;
563 #endif
564 struct select_ws_wait_data *data;
565 curl_win_thread_handle_t thread;
566
567 /* allocate internal waiting data structure */
568 data = malloc(sizeof(struct select_ws_wait_data));
569 if(data) {
570 data->handle = handle;
571 data->signal = signal;
572 data->abort = abort;
573
574 /* launch waiting thread */
575 #ifdef _WIN32_WCE
576 thread = CreateThread(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
577 #else
578 thread = _beginthreadex(NULL, 0, &select_ws_wait_thread, data, 0, NULL);
579 #endif
580
581 /* free data if thread failed to launch */
582 if(!thread) {
583 free(data);
584 }
585 return (HANDLE)thread;
586 }
587 return NULL;
588 }
589 struct select_ws_data {
590 int fd; /* provided file descriptor (indexed by nfd) */
591 long wsastate; /* internal pre-select state (indexed by nfd) */
592 curl_socket_t wsasock; /* internal socket handle (indexed by nws) */
593 WSAEVENT wsaevent; /* internal select event (indexed by nws) */
594 HANDLE signal; /* internal thread signal (indexed by nth) */
595 HANDLE thread; /* internal thread handle (indexed by nth) */
596 };
select_ws(int nfds,fd_set * readfds,fd_set * writefds,fd_set * exceptfds,struct timeval * tv)597 static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
598 fd_set *exceptfds, struct timeval *tv)
599 {
600 DWORD timeout_ms, wait, nfd, nth, nws, i;
601 HANDLE abort, signal, handle, *handles;
602 fd_set readsock, writesock, exceptsock;
603 struct select_ws_data *data;
604 WSANETWORKEVENTS wsaevents;
605 curl_socket_t wsasock;
606 int error, ret, fd;
607 WSAEVENT wsaevent;
608
609 /* check if the input value is valid */
610 if(nfds < 0) {
611 errno = EINVAL;
612 return -1;
613 }
614
615 /* convert struct timeval to milliseconds */
616 if(tv) {
617 timeout_ms = (DWORD)curlx_tvtoms(tv);
618 }
619 else {
620 timeout_ms = INFINITE;
621 }
622
623 /* check if we got descriptors, sleep in case we got none */
624 if(!nfds) {
625 SleepEx(timeout_ms, FALSE);
626 return 0;
627 }
628
629 /* create internal event to abort waiting threads */
630 abort = CreateEvent(NULL, TRUE, FALSE, NULL);
631 if(!abort) {
632 errno = ENOMEM;
633 return -1;
634 }
635
636 /* allocate internal array for the internal data */
637 data = calloc(nfds, sizeof(struct select_ws_data));
638 if(!data) {
639 CloseHandle(abort);
640 errno = ENOMEM;
641 return -1;
642 }
643
644 /* allocate internal array for the internal event handles */
645 handles = calloc(nfds + 1, sizeof(HANDLE));
646 if(!handles) {
647 CloseHandle(abort);
648 free(data);
649 errno = ENOMEM;
650 return -1;
651 }
652
653 /* loop over the handles in the input descriptor sets */
654 nfd = 0; /* number of handled file descriptors */
655 nth = 0; /* number of internal waiting threads */
656 nws = 0; /* number of handled WINSOCK sockets */
657 for(fd = 0; fd < nfds; fd++) {
658 wsasock = curlx_sitosk(fd);
659 wsaevents.lNetworkEvents = 0;
660 handles[nfd] = 0;
661
662 FD_ZERO(&readsock);
663 FD_ZERO(&writesock);
664 FD_ZERO(&exceptsock);
665
666 if(FD_ISSET(wsasock, readfds)) {
667 FD_SET(wsasock, &readsock);
668 wsaevents.lNetworkEvents |= FD_READ|FD_ACCEPT|FD_CLOSE;
669 }
670
671 if(FD_ISSET(wsasock, writefds)) {
672 FD_SET(wsasock, &writesock);
673 wsaevents.lNetworkEvents |= FD_WRITE|FD_CONNECT|FD_CLOSE;
674 }
675
676 if(FD_ISSET(wsasock, exceptfds)) {
677 FD_SET(wsasock, &exceptsock);
678 wsaevents.lNetworkEvents |= FD_OOB;
679 }
680
681 /* only wait for events for which we actually care */
682 if(wsaevents.lNetworkEvents) {
683 data[nfd].fd = fd;
684 if(fd == fileno(stdin)) {
685 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
686 if(signal) {
687 handle = GetStdHandle(STD_INPUT_HANDLE);
688 handle = select_ws_wait(handle, signal, abort);
689 if(handle) {
690 handles[nfd] = signal;
691 data[nth].signal = signal;
692 data[nth].thread = handle;
693 nfd++;
694 nth++;
695 }
696 else {
697 CloseHandle(signal);
698 }
699 }
700 }
701 else if(fd == fileno(stdout)) {
702 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
703 nfd++;
704 }
705 else if(fd == fileno(stderr)) {
706 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
707 nfd++;
708 }
709 else {
710 wsaevent = WSACreateEvent();
711 if(wsaevent != WSA_INVALID_EVENT) {
712 if(wsaevents.lNetworkEvents & FD_WRITE) {
713 send(wsasock, NULL, 0, 0); /* reset FD_WRITE */
714 }
715 error = WSAEventSelect(wsasock, wsaevent, wsaevents.lNetworkEvents);
716 if(error != SOCKET_ERROR) {
717 handles[nfd] = (HANDLE)wsaevent;
718 data[nws].wsasock = wsasock;
719 data[nws].wsaevent = wsaevent;
720 data[nfd].wsastate = 0;
721 tv->tv_sec = 0;
722 tv->tv_usec = 0;
723 /* check if the socket is already ready */
724 if(select(fd + 1, &readsock, &writesock, &exceptsock, tv) == 1) {
725 logmsg("[select_ws] socket %d is ready", fd);
726 WSASetEvent(wsaevent);
727 if(FD_ISSET(wsasock, &readsock))
728 data[nfd].wsastate |= FD_READ;
729 if(FD_ISSET(wsasock, &writesock))
730 data[nfd].wsastate |= FD_WRITE;
731 if(FD_ISSET(wsasock, &exceptsock))
732 data[nfd].wsastate |= FD_OOB;
733 }
734 nfd++;
735 nws++;
736 }
737 else {
738 WSACloseEvent(wsaevent);
739 signal = CreateEvent(NULL, TRUE, FALSE, NULL);
740 if(signal) {
741 handle = (HANDLE)wsasock;
742 handle = select_ws_wait(handle, signal, abort);
743 if(handle) {
744 handles[nfd] = signal;
745 data[nth].signal = signal;
746 data[nth].thread = handle;
747 nfd++;
748 nth++;
749 }
750 else {
751 CloseHandle(signal);
752 }
753 }
754 }
755 }
756 }
757 }
758 }
759
760 /* wait on the number of handles */
761 wait = nfd;
762
763 /* make sure we stop waiting on exit signal event */
764 if(exit_event) {
765 /* we allocated handles nfds + 1 for this */
766 handles[nfd] = exit_event;
767 wait += 1;
768 }
769
770 /* wait for one of the internal handles to trigger */
771 wait = WaitForMultipleObjectsEx(wait, handles, FALSE, timeout_ms, FALSE);
772
773 /* signal the abort event handle and join the other waiting threads */
774 SetEvent(abort);
775 for(i = 0; i < nth; i++) {
776 WaitForSingleObjectEx(data[i].thread, INFINITE, FALSE);
777 CloseHandle(data[i].thread);
778 }
779
780 /* loop over the internal handles returned in the descriptors */
781 ret = 0; /* number of ready file descriptors */
782 for(i = 0; i < nfd; i++) {
783 fd = data[i].fd;
784 handle = handles[i];
785 wsasock = curlx_sitosk(fd);
786
787 /* check if the current internal handle was triggered */
788 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) <= i &&
789 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
790 /* first handle stdin, stdout and stderr */
791 if(fd == fileno(stdin)) {
792 /* stdin is never ready for write or exceptional */
793 FD_CLR(wsasock, writefds);
794 FD_CLR(wsasock, exceptfds);
795 }
796 else if(fd == fileno(stdout) || fd == fileno(stderr)) {
797 /* stdout and stderr are never ready for read or exceptional */
798 FD_CLR(wsasock, readfds);
799 FD_CLR(wsasock, exceptfds);
800 }
801 else {
802 /* try to handle the event with the WINSOCK2 functions */
803 wsaevents.lNetworkEvents = 0;
804 error = WSAEnumNetworkEvents(wsasock, handle, &wsaevents);
805 if(error != SOCKET_ERROR) {
806 /* merge result from pre-check using select */
807 wsaevents.lNetworkEvents |= data[i].wsastate;
808
809 /* remove from descriptor set if not ready for read/accept/close */
810 if(!(wsaevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
811 FD_CLR(wsasock, readfds);
812
813 /* remove from descriptor set if not ready for write/connect */
814 if(!(wsaevents.lNetworkEvents & (FD_WRITE|FD_CONNECT|FD_CLOSE)))
815 FD_CLR(wsasock, writefds);
816
817 /* remove from descriptor set if not exceptional */
818 if(!(wsaevents.lNetworkEvents & FD_OOB))
819 FD_CLR(wsasock, exceptfds);
820 }
821 }
822
823 /* check if the event has not been filtered using specific tests */
824 if(FD_ISSET(wsasock, readfds) || FD_ISSET(wsasock, writefds) ||
825 FD_ISSET(wsasock, exceptfds)) {
826 ret++;
827 }
828 }
829 else {
830 /* remove from all descriptor sets since this handle did not trigger */
831 FD_CLR(wsasock, readfds);
832 FD_CLR(wsasock, writefds);
833 FD_CLR(wsasock, exceptfds);
834 }
835 }
836
837 for(fd = 0; fd < nfds; fd++) {
838 if(FD_ISSET(fd, readfds))
839 logmsg("[select_ws] %d is readable", fd);
840 if(FD_ISSET(fd, writefds))
841 logmsg("[select_ws] %d is writable", fd);
842 if(FD_ISSET(fd, exceptfds))
843 logmsg("[select_ws] %d is exceptional", fd);
844 }
845
846 for(i = 0; i < nws; i++) {
847 WSAEventSelect(data[i].wsasock, NULL, 0);
848 WSACloseEvent(data[i].wsaevent);
849 }
850
851 for(i = 0; i < nth; i++) {
852 CloseHandle(data[i].signal);
853 }
854 CloseHandle(abort);
855
856 free(handles);
857 free(data);
858
859 return ret;
860 }
861 #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
862 #endif /* USE_WINSOCK */
863
864 /*
865 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
866
867 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
868 accept()
869 */
juggle(curl_socket_t * sockfdp,curl_socket_t listenfd,enum sockmode * mode)870 static bool juggle(curl_socket_t *sockfdp,
871 curl_socket_t listenfd,
872 enum sockmode *mode)
873 {
874 struct timeval timeout;
875 fd_set fds_read;
876 fd_set fds_write;
877 fd_set fds_err;
878 curl_socket_t sockfd = CURL_SOCKET_BAD;
879 int maxfd = -99;
880 ssize_t rc;
881 int error = 0;
882
883 /* 'buffer' is this excessively large only to be able to support things like
884 test 1003 which tests exceedingly large server response lines */
885 unsigned char buffer[17010];
886 char data[16];
887
888 if(got_exit_signal) {
889 logmsg("signalled to die, exiting...");
890 return FALSE;
891 }
892
893 #ifdef HAVE_GETPPID
894 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
895 parent ftpserver process has died without killing its sockfilt children */
896 if(getppid() <= 1) {
897 logmsg("process becomes orphan, exiting");
898 return FALSE;
899 }
900 #endif
901
902 timeout.tv_sec = 120;
903 timeout.tv_usec = 0;
904
905 FD_ZERO(&fds_read);
906 FD_ZERO(&fds_write);
907 FD_ZERO(&fds_err);
908
909 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
910
911 switch(*mode) {
912
913 case PASSIVE_LISTEN:
914
915 /* server mode */
916 sockfd = listenfd;
917 /* there's always a socket to wait for */
918 FD_SET(sockfd, &fds_read);
919 maxfd = (int)sockfd;
920 break;
921
922 case PASSIVE_CONNECT:
923
924 sockfd = *sockfdp;
925 if(CURL_SOCKET_BAD == sockfd) {
926 /* eeek, we are supposedly connected and then this cannot be -1 ! */
927 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
928 maxfd = 0; /* stdin */
929 }
930 else {
931 /* there's always a socket to wait for */
932 FD_SET(sockfd, &fds_read);
933 maxfd = (int)sockfd;
934 }
935 break;
936
937 case ACTIVE:
938
939 sockfd = *sockfdp;
940 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
941 if(CURL_SOCKET_BAD != sockfd) {
942 FD_SET(sockfd, &fds_read);
943 maxfd = (int)sockfd;
944 }
945 else {
946 logmsg("No socket to read on");
947 maxfd = 0;
948 }
949 break;
950
951 case ACTIVE_DISCONNECT:
952
953 logmsg("disconnected, no socket to read on");
954 maxfd = 0;
955 sockfd = CURL_SOCKET_BAD;
956 break;
957
958 } /* switch(*mode) */
959
960
961 do {
962
963 /* select() blocking behavior call on blocking descriptors please */
964
965 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
966
967 if(got_exit_signal) {
968 logmsg("signalled to die, exiting...");
969 return FALSE;
970 }
971
972 } while((rc == -1) && ((error = errno) == EINTR));
973
974 if(rc < 0) {
975 logmsg("select() failed with error: (%d) %s",
976 error, strerror(error));
977 return FALSE;
978 }
979
980 if(rc == 0)
981 /* timeout */
982 return TRUE;
983
984
985 if(FD_ISSET(fileno(stdin), &fds_read)) {
986 ssize_t buffer_len;
987 /* read from stdin, commands/data to be dealt with and possibly passed on
988 to the socket
989
990 protocol:
991
992 4 letter command + LF [mandatory]
993
994 4-digit hexadecimal data length + LF [if the command takes data]
995 data [the data being as long as set above]
996
997 Commands:
998
999 DATA - plain pass-through data
1000 */
1001
1002 if(!read_stdin(buffer, 5))
1003 return FALSE;
1004
1005 logmsg("Received %c%c%c%c (on stdin)",
1006 buffer[0], buffer[1], buffer[2], buffer[3]);
1007
1008 if(!memcmp("PING", buffer, 4)) {
1009 /* send reply on stdout, just proving we are alive */
1010 if(!write_stdout("PONG\n", 5))
1011 return FALSE;
1012 }
1013
1014 else if(!memcmp("PORT", buffer, 4)) {
1015 /* Question asking us what PORT number we are listening to.
1016 Replies to PORT with "IPv[num]/[port]" */
1017 msnprintf((char *)buffer, sizeof(buffer), "%s/%hu\n", ipv_inuse, port);
1018 buffer_len = (ssize_t)strlen((char *)buffer);
1019 msnprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
1020 if(!write_stdout(data, 10))
1021 return FALSE;
1022 if(!write_stdout(buffer, buffer_len))
1023 return FALSE;
1024 }
1025 else if(!memcmp("QUIT", buffer, 4)) {
1026 /* just die */
1027 logmsg("quits");
1028 return FALSE;
1029 }
1030 else if(!memcmp("DATA", buffer, 4)) {
1031 /* data IN => data OUT */
1032
1033 if(!read_stdin(buffer, 5))
1034 return FALSE;
1035
1036 buffer[5] = '\0';
1037
1038 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
1039 if(buffer_len > (ssize_t)sizeof(buffer)) {
1040 logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
1041 "(%zd bytes)", sizeof(buffer), buffer_len);
1042 return FALSE;
1043 }
1044 logmsg("> %zd bytes data, server => client", buffer_len);
1045
1046 if(!read_stdin(buffer, buffer_len))
1047 return FALSE;
1048
1049 lograw(buffer, buffer_len);
1050
1051 if(*mode == PASSIVE_LISTEN) {
1052 logmsg("*** We are disconnected!");
1053 if(!write_stdout("DISC\n", 5))
1054 return FALSE;
1055 }
1056 else {
1057 /* send away on the socket */
1058 ssize_t bytes_written = swrite(sockfd, buffer, buffer_len);
1059 if(bytes_written != buffer_len) {
1060 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
1061 buffer_len, bytes_written);
1062 }
1063 }
1064 }
1065 else if(!memcmp("DISC", buffer, 4)) {
1066 /* disconnect! */
1067 if(!write_stdout("DISC\n", 5))
1068 return FALSE;
1069 if(sockfd != CURL_SOCKET_BAD) {
1070 logmsg("====> Client forcibly disconnected");
1071 sclose(sockfd);
1072 *sockfdp = CURL_SOCKET_BAD;
1073 if(*mode == PASSIVE_CONNECT)
1074 *mode = PASSIVE_LISTEN;
1075 else
1076 *mode = ACTIVE_DISCONNECT;
1077 }
1078 else
1079 logmsg("attempt to close already dead connection");
1080 return TRUE;
1081 }
1082 }
1083
1084
1085 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
1086 ssize_t nread_socket;
1087 if(*mode == PASSIVE_LISTEN) {
1088 /* there's no stream set up yet, this is an indication that there's a
1089 client connecting. */
1090 curl_socket_t newfd = accept(sockfd, NULL, NULL);
1091 if(CURL_SOCKET_BAD == newfd) {
1092 error = SOCKERRNO;
1093 logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
1094 sockfd, error, strerror(error));
1095 }
1096 else {
1097 logmsg("====> Client connect");
1098 if(!write_stdout("CNCT\n", 5))
1099 return FALSE;
1100 *sockfdp = newfd; /* store the new socket */
1101 *mode = PASSIVE_CONNECT; /* we have connected */
1102 }
1103 return TRUE;
1104 }
1105
1106 /* read from socket, pass on data to stdout */
1107 nread_socket = sread(sockfd, buffer, sizeof(buffer));
1108
1109 if(nread_socket > 0) {
1110 msnprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
1111 if(!write_stdout(data, 10))
1112 return FALSE;
1113 if(!write_stdout(buffer, nread_socket))
1114 return FALSE;
1115
1116 logmsg("< %zd bytes data, client => server", nread_socket);
1117 lograw(buffer, nread_socket);
1118 }
1119
1120 if(nread_socket <= 0) {
1121 logmsg("====> Client disconnect");
1122 if(!write_stdout("DISC\n", 5))
1123 return FALSE;
1124 sclose(sockfd);
1125 *sockfdp = CURL_SOCKET_BAD;
1126 if(*mode == PASSIVE_CONNECT)
1127 *mode = PASSIVE_LISTEN;
1128 else
1129 *mode = ACTIVE_DISCONNECT;
1130 return TRUE;
1131 }
1132 }
1133
1134 return TRUE;
1135 }
1136
sockdaemon(curl_socket_t sock,unsigned short * listenport)1137 static curl_socket_t sockdaemon(curl_socket_t sock,
1138 unsigned short *listenport)
1139 {
1140 /* passive daemon style */
1141 srvr_sockaddr_union_t listener;
1142 int flag;
1143 int rc;
1144 int totdelay = 0;
1145 int maxretr = 10;
1146 int delay = 20;
1147 int attempt = 0;
1148 int error = 0;
1149
1150 do {
1151 attempt++;
1152 flag = 1;
1153 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
1154 (void *)&flag, sizeof(flag));
1155 if(rc) {
1156 error = SOCKERRNO;
1157 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
1158 error, strerror(error));
1159 if(maxretr) {
1160 rc = wait_ms(delay);
1161 if(rc) {
1162 /* should not happen */
1163 error = errno;
1164 logmsg("wait_ms() failed with error: (%d) %s",
1165 error, strerror(error));
1166 sclose(sock);
1167 return CURL_SOCKET_BAD;
1168 }
1169 if(got_exit_signal) {
1170 logmsg("signalled to die, exiting...");
1171 sclose(sock);
1172 return CURL_SOCKET_BAD;
1173 }
1174 totdelay += delay;
1175 delay *= 2; /* double the sleep for next attempt */
1176 }
1177 }
1178 } while(rc && maxretr--);
1179
1180 if(rc) {
1181 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
1182 attempt, totdelay, error, strerror(error));
1183 logmsg("Continuing anyway...");
1184 }
1185
1186 /* When the specified listener port is zero, it is actually a
1187 request to let the system choose a non-zero available port. */
1188
1189 #ifdef ENABLE_IPV6
1190 if(!use_ipv6) {
1191 #endif
1192 memset(&listener.sa4, 0, sizeof(listener.sa4));
1193 listener.sa4.sin_family = AF_INET;
1194 listener.sa4.sin_addr.s_addr = INADDR_ANY;
1195 listener.sa4.sin_port = htons(*listenport);
1196 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
1197 #ifdef ENABLE_IPV6
1198 }
1199 else {
1200 memset(&listener.sa6, 0, sizeof(listener.sa6));
1201 listener.sa6.sin6_family = AF_INET6;
1202 listener.sa6.sin6_addr = in6addr_any;
1203 listener.sa6.sin6_port = htons(*listenport);
1204 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1205 }
1206 #endif /* ENABLE_IPV6 */
1207 if(rc) {
1208 error = SOCKERRNO;
1209 logmsg("Error binding socket on port %hu: (%d) %s",
1210 *listenport, error, strerror(error));
1211 sclose(sock);
1212 return CURL_SOCKET_BAD;
1213 }
1214
1215 if(!*listenport) {
1216 /* The system was supposed to choose a port number, figure out which
1217 port we actually got and update the listener port value with it. */
1218 curl_socklen_t la_size;
1219 srvr_sockaddr_union_t localaddr;
1220 #ifdef ENABLE_IPV6
1221 if(!use_ipv6)
1222 #endif
1223 la_size = sizeof(localaddr.sa4);
1224 #ifdef ENABLE_IPV6
1225 else
1226 la_size = sizeof(localaddr.sa6);
1227 #endif
1228 memset(&localaddr.sa, 0, (size_t)la_size);
1229 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1230 error = SOCKERRNO;
1231 logmsg("getsockname() failed with error: (%d) %s",
1232 error, strerror(error));
1233 sclose(sock);
1234 return CURL_SOCKET_BAD;
1235 }
1236 switch(localaddr.sa.sa_family) {
1237 case AF_INET:
1238 *listenport = ntohs(localaddr.sa4.sin_port);
1239 break;
1240 #ifdef ENABLE_IPV6
1241 case AF_INET6:
1242 *listenport = ntohs(localaddr.sa6.sin6_port);
1243 break;
1244 #endif
1245 default:
1246 break;
1247 }
1248 if(!*listenport) {
1249 /* Real failure, listener port shall not be zero beyond this point. */
1250 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1251 logmsg("A valid reason for this failure is a binary built without");
1252 logmsg("proper network library linkage. This might not be the only");
1253 logmsg("reason, but double check it before anything else.");
1254 sclose(sock);
1255 return CURL_SOCKET_BAD;
1256 }
1257 }
1258
1259 /* bindonly option forces no listening */
1260 if(bind_only) {
1261 logmsg("instructed to bind port without listening");
1262 return sock;
1263 }
1264
1265 /* start accepting connections */
1266 rc = listen(sock, 5);
1267 if(0 != rc) {
1268 error = SOCKERRNO;
1269 logmsg("listen(%d, 5) failed with error: (%d) %s",
1270 sock, error, strerror(error));
1271 sclose(sock);
1272 return CURL_SOCKET_BAD;
1273 }
1274
1275 return sock;
1276 }
1277
1278
main(int argc,char * argv[])1279 int main(int argc, char *argv[])
1280 {
1281 srvr_sockaddr_union_t me;
1282 curl_socket_t sock = CURL_SOCKET_BAD;
1283 curl_socket_t msgsock = CURL_SOCKET_BAD;
1284 int wrotepidfile = 0;
1285 int wroteportfile = 0;
1286 const char *pidname = ".sockfilt.pid";
1287 const char *portname = NULL; /* none by default */
1288 bool juggle_again;
1289 int rc;
1290 int error;
1291 int arg = 1;
1292 enum sockmode mode = PASSIVE_LISTEN; /* default */
1293 const char *addr = NULL;
1294
1295 while(argc>arg) {
1296 if(!strcmp("--version", argv[arg])) {
1297 printf("sockfilt IPv4%s\n",
1298 #ifdef ENABLE_IPV6
1299 "/IPv6"
1300 #else
1301 ""
1302 #endif
1303 );
1304 return 0;
1305 }
1306 else if(!strcmp("--verbose", argv[arg])) {
1307 verbose = TRUE;
1308 arg++;
1309 }
1310 else if(!strcmp("--pidfile", argv[arg])) {
1311 arg++;
1312 if(argc>arg)
1313 pidname = argv[arg++];
1314 }
1315 else if(!strcmp("--portfile", argv[arg])) {
1316 arg++;
1317 if(argc > arg)
1318 portname = argv[arg++];
1319 }
1320 else if(!strcmp("--logfile", argv[arg])) {
1321 arg++;
1322 if(argc>arg)
1323 serverlogfile = argv[arg++];
1324 }
1325 else if(!strcmp("--ipv6", argv[arg])) {
1326 #ifdef ENABLE_IPV6
1327 ipv_inuse = "IPv6";
1328 use_ipv6 = TRUE;
1329 #endif
1330 arg++;
1331 }
1332 else if(!strcmp("--ipv4", argv[arg])) {
1333 /* for completeness, we support this option as well */
1334 #ifdef ENABLE_IPV6
1335 ipv_inuse = "IPv4";
1336 use_ipv6 = FALSE;
1337 #endif
1338 arg++;
1339 }
1340 else if(!strcmp("--bindonly", argv[arg])) {
1341 bind_only = TRUE;
1342 arg++;
1343 }
1344 else if(!strcmp("--port", argv[arg])) {
1345 arg++;
1346 if(argc>arg) {
1347 char *endptr;
1348 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1349 port = curlx_ultous(ulnum);
1350 arg++;
1351 }
1352 }
1353 else if(!strcmp("--connect", argv[arg])) {
1354 /* Asked to actively connect to the specified local port instead of
1355 doing a passive server-style listening. */
1356 arg++;
1357 if(argc>arg) {
1358 char *endptr;
1359 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1360 if((endptr != argv[arg] + strlen(argv[arg])) ||
1361 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1362 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1363 argv[arg]);
1364 return 0;
1365 }
1366 connectport = curlx_ultous(ulnum);
1367 arg++;
1368 }
1369 }
1370 else if(!strcmp("--addr", argv[arg])) {
1371 /* Set an IP address to use with --connect; otherwise use localhost */
1372 arg++;
1373 if(argc>arg) {
1374 addr = argv[arg];
1375 arg++;
1376 }
1377 }
1378 else {
1379 puts("Usage: sockfilt [option]\n"
1380 " --version\n"
1381 " --verbose\n"
1382 " --logfile [file]\n"
1383 " --pidfile [file]\n"
1384 " --portfile [file]\n"
1385 " --ipv4\n"
1386 " --ipv6\n"
1387 " --bindonly\n"
1388 " --port [port]\n"
1389 " --connect [port]\n"
1390 " --addr [address]");
1391 return 0;
1392 }
1393 }
1394
1395 #ifdef WIN32
1396 win32_init();
1397 atexit(win32_cleanup);
1398
1399 setmode(fileno(stdin), O_BINARY);
1400 setmode(fileno(stdout), O_BINARY);
1401 setmode(fileno(stderr), O_BINARY);
1402 #endif
1403
1404 install_signal_handlers(false);
1405
1406 #ifdef ENABLE_IPV6
1407 if(!use_ipv6)
1408 #endif
1409 sock = socket(AF_INET, SOCK_STREAM, 0);
1410 #ifdef ENABLE_IPV6
1411 else
1412 sock = socket(AF_INET6, SOCK_STREAM, 0);
1413 #endif
1414
1415 if(CURL_SOCKET_BAD == sock) {
1416 error = SOCKERRNO;
1417 logmsg("Error creating socket: (%d) %s",
1418 error, strerror(error));
1419 write_stdout("FAIL\n", 5);
1420 goto sockfilt_cleanup;
1421 }
1422
1423 if(connectport) {
1424 /* Active mode, we should connect to the given port number */
1425 mode = ACTIVE;
1426 #ifdef ENABLE_IPV6
1427 if(!use_ipv6) {
1428 #endif
1429 memset(&me.sa4, 0, sizeof(me.sa4));
1430 me.sa4.sin_family = AF_INET;
1431 me.sa4.sin_port = htons(connectport);
1432 me.sa4.sin_addr.s_addr = INADDR_ANY;
1433 if(!addr)
1434 addr = "127.0.0.1";
1435 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1436
1437 rc = connect(sock, &me.sa, sizeof(me.sa4));
1438 #ifdef ENABLE_IPV6
1439 }
1440 else {
1441 memset(&me.sa6, 0, sizeof(me.sa6));
1442 me.sa6.sin6_family = AF_INET6;
1443 me.sa6.sin6_port = htons(connectport);
1444 if(!addr)
1445 addr = "::1";
1446 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1447
1448 rc = connect(sock, &me.sa, sizeof(me.sa6));
1449 }
1450 #endif /* ENABLE_IPV6 */
1451 if(rc) {
1452 error = SOCKERRNO;
1453 logmsg("Error connecting to port %hu: (%d) %s",
1454 connectport, error, strerror(error));
1455 write_stdout("FAIL\n", 5);
1456 goto sockfilt_cleanup;
1457 }
1458 logmsg("====> Client connect");
1459 msgsock = sock; /* use this as stream */
1460 }
1461 else {
1462 /* passive daemon style */
1463 sock = sockdaemon(sock, &port);
1464 if(CURL_SOCKET_BAD == sock) {
1465 write_stdout("FAIL\n", 5);
1466 goto sockfilt_cleanup;
1467 }
1468 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1469 }
1470
1471 logmsg("Running %s version", ipv_inuse);
1472
1473 if(connectport)
1474 logmsg("Connected to port %hu", connectport);
1475 else if(bind_only)
1476 logmsg("Bound without listening on port %hu", port);
1477 else
1478 logmsg("Listening on port %hu", port);
1479
1480 wrotepidfile = write_pidfile(pidname);
1481 if(!wrotepidfile) {
1482 write_stdout("FAIL\n", 5);
1483 goto sockfilt_cleanup;
1484 }
1485 if(portname) {
1486 wroteportfile = write_portfile(portname, port);
1487 if(!wroteportfile) {
1488 write_stdout("FAIL\n", 5);
1489 goto sockfilt_cleanup;
1490 }
1491 }
1492
1493 do {
1494 juggle_again = juggle(&msgsock, sock, &mode);
1495 } while(juggle_again);
1496
1497 sockfilt_cleanup:
1498
1499 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1500 sclose(msgsock);
1501
1502 if(sock != CURL_SOCKET_BAD)
1503 sclose(sock);
1504
1505 if(wrotepidfile)
1506 unlink(pidname);
1507 if(wroteportfile)
1508 unlink(portname);
1509
1510 restore_signal_handlers(false);
1511
1512 if(got_exit_signal) {
1513 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1514 /*
1515 * To properly set the return status of the process we
1516 * must raise the same signal SIGINT or SIGTERM that we
1517 * caught and let the old handler take care of it.
1518 */
1519 raise(exit_signal);
1520 }
1521
1522 logmsg("============> sockfilt quits");
1523 return 0;
1524 }
1525