1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.
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 http://curl.haxx.se/docs/copyright.html.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
22 #include "server_setup.h"
26 * 1. Accept a TCP connection on a custom port (ipv4 or ipv6), or connect
27 * to a given (localhost) port.
29 * 2. Get commands on STDIN. Pass data on to the TCP stream.
30 * Get data from TCP stream and pass on to STDOUT.
32 * This program is made to perform all the socket/stream/connection stuff for
33 * the test suite's (perl) FTP server. Previously the perl code did all of
34 * this by its own, but I decided to let this program do the socket layer
35 * because of several things:
37 * o We want the perl code to work with rather old perl installations, thus
38 * we cannot use recent perl modules or features.
40 * o We want IPv6 support for systems that provide it, and doing optional IPv6
41 * support in perl seems if not impossible so at least awkward.
43 * o We want FTP-SSL support, which means that a connection that starts with
44 * plain sockets needs to be able to "go SSL" in the midst. This would also
45 * require some nasty perl stuff I'd rather avoid.
47 * (Source originally based on sws.c)
51 * Signal handling notes for sockfilt
52 * ----------------------------------
54 * This program is a single-threaded process.
56 * This program is intended to be highly portable and as such it must be kept as
57 * simple as possible, due to this the only signal handling mechanisms used will
58 * be those of ANSI C, and used only in the most basic form which is good enough
59 * for the purpose of this program.
61 * For the above reason and the specific needs of this program signals SIGHUP,
62 * SIGPIPE and SIGALRM will be simply ignored on systems where this can be done.
63 * If possible, signals SIGINT and SIGTERM will be handled by this program as an
64 * indication to cleanup and finish execution as soon as possible. This will be
65 * achieved with a single signal handler 'exit_signal_handler' for both signals.
67 * The 'exit_signal_handler' upon the first SIGINT or SIGTERM received signal
68 * will just set to one the global var 'got_exit_signal' storing in global var
69 * 'exit_signal' the signal that triggered this change.
71 * Nothing fancy that could introduce problems is used, the program at certain
72 * points in its normal flow checks if var 'got_exit_signal' is set and in case
73 * this is true it just makes its way out of loops and functions in structured
74 * and well behaved manner to achieve proper program cleanup and termination.
76 * Even with the above mechanism implemented it is worthwile to note that other
77 * signals might still be received, or that there might be systems on which it
78 * is not possible to trap and ignore some of the above signals. This implies
79 * that for increased portability and reliability the program must be coded as
80 * if no signal was being ignored or handled at all. Enjoy it!
86 #ifdef HAVE_NETINET_IN_H
87 #include <netinet/in.h>
89 #ifdef HAVE_ARPA_INET_H
90 #include <arpa/inet.h>
96 #include <conio.h> /* for _kbhit() used in select_ws() */
99 #define ENABLE_CURLX_PRINTF
100 /* make the curlx header define all printf() functions to use the curlx_*
102 #include "curlx.h" /* from the private lib dir */
104 #include "inet_pton.h"
106 #include "server_sockaddr.h"
107 #include "warnless.h"
109 /* include memdebug.h last */
110 #include "memdebug.h"
114 #define EINTR 4 /* errno.h value */
116 #define EAGAIN 11 /* errno.h value */
118 #define ENOMEM 12 /* errno.h value */
120 #define EINVAL 22 /* errno.h value */
123 #define DEFAULT_PORT 8999
125 #ifndef DEFAULT_LOGFILE
126 #define DEFAULT_LOGFILE "log/sockfilt.log"
129 const char *serverlogfile = DEFAULT_LOGFILE;
131 static bool verbose = FALSE;
132 static bool bind_only = FALSE;
134 static bool use_ipv6 = FALSE;
136 static const char *ipv_inuse = "IPv4";
137 static unsigned short port = DEFAULT_PORT;
138 static unsigned short connectport = 0; /* if non-zero, we activate this mode */
141 PASSIVE_LISTEN, /* as a server waiting for connections */
142 PASSIVE_CONNECT, /* as a server, connected to a client */
143 ACTIVE, /* as a client, connected to a server */
144 ACTIVE_DISCONNECT /* as a client, disconnected from server */
147 /* do-nothing macro replacement for systems which lack siginterrupt() */
149 #ifndef HAVE_SIGINTERRUPT
150 #define siginterrupt(x,y) do {} while(0)
153 /* vars used to keep around previous signal handlers */
155 typedef RETSIGTYPE (*SIGHANDLER_T)(int);
158 static SIGHANDLER_T old_sighup_handler = SIG_ERR;
162 static SIGHANDLER_T old_sigpipe_handler = SIG_ERR;
166 static SIGHANDLER_T old_sigalrm_handler = SIG_ERR;
170 static SIGHANDLER_T old_sigint_handler = SIG_ERR;
174 static SIGHANDLER_T old_sigterm_handler = SIG_ERR;
177 #if defined(SIGBREAK) && defined(WIN32)
178 static SIGHANDLER_T old_sigbreak_handler = SIG_ERR;
181 /* var which if set indicates that the program should finish execution */
183 SIG_ATOMIC_T got_exit_signal = 0;
185 /* if next is set indicates the first signal handled in exit_signal_handler */
187 static volatile int exit_signal = 0;
189 /* signal handler that will be triggered to indicate that the program
190 should finish its execution in a controlled manner as soon as possible.
191 The first time this is called it will set got_exit_signal to one and
192 store in exit_signal the signal that triggered its execution. */
194 static RETSIGTYPE exit_signal_handler(int signum)
196 int old_errno = errno;
197 if(got_exit_signal == 0) {
199 exit_signal = signum;
201 (void)signal(signum, exit_signal_handler);
205 static void install_signal_handlers(void)
208 /* ignore SIGHUP signal */
209 if((old_sighup_handler = signal(SIGHUP, SIG_IGN)) == SIG_ERR)
210 logmsg("cannot install SIGHUP handler: %s", strerror(errno));
213 /* ignore SIGPIPE signal */
214 if((old_sigpipe_handler = signal(SIGPIPE, SIG_IGN)) == SIG_ERR)
215 logmsg("cannot install SIGPIPE handler: %s", strerror(errno));
218 /* ignore SIGALRM signal */
219 if((old_sigalrm_handler = signal(SIGALRM, SIG_IGN)) == SIG_ERR)
220 logmsg("cannot install SIGALRM handler: %s", strerror(errno));
223 /* handle SIGINT signal with our exit_signal_handler */
224 if((old_sigint_handler = signal(SIGINT, exit_signal_handler)) == SIG_ERR)
225 logmsg("cannot install SIGINT handler: %s", strerror(errno));
227 siginterrupt(SIGINT, 1);
230 /* handle SIGTERM signal with our exit_signal_handler */
231 if((old_sigterm_handler = signal(SIGTERM, exit_signal_handler)) == SIG_ERR)
232 logmsg("cannot install SIGTERM handler: %s", strerror(errno));
234 siginterrupt(SIGTERM, 1);
236 #if defined(SIGBREAK) && defined(WIN32)
237 /* handle SIGBREAK signal with our exit_signal_handler */
238 if((old_sigbreak_handler = signal(SIGBREAK, exit_signal_handler)) == SIG_ERR)
239 logmsg("cannot install SIGBREAK handler: %s", strerror(errno));
241 siginterrupt(SIGBREAK, 1);
245 static void restore_signal_handlers(void)
248 if(SIG_ERR != old_sighup_handler)
249 (void)signal(SIGHUP, old_sighup_handler);
252 if(SIG_ERR != old_sigpipe_handler)
253 (void)signal(SIGPIPE, old_sigpipe_handler);
256 if(SIG_ERR != old_sigalrm_handler)
257 (void)signal(SIGALRM, old_sigalrm_handler);
260 if(SIG_ERR != old_sigint_handler)
261 (void)signal(SIGINT, old_sigint_handler);
264 if(SIG_ERR != old_sigterm_handler)
265 (void)signal(SIGTERM, old_sigterm_handler);
267 #if defined(SIGBREAK) && defined(WIN32)
268 if(SIG_ERR != old_sigbreak_handler)
269 (void)signal(SIGBREAK, old_sigbreak_handler);
274 * fullread is a wrapper around the read() function. This will repeat the call
275 * to read() until it actually has read the complete number of bytes indicated
276 * in nbytes or it fails with a condition that cannot be handled with a simple
277 * retry of the read call.
280 static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
287 rc = read(filedes, (unsigned char *)buffer + nread, nbytes - nread);
289 if(got_exit_signal) {
290 logmsg("signalled to die");
296 if((error == EINTR) || (error == EAGAIN))
298 logmsg("reading from file descriptor: %d,", filedes);
299 logmsg("unrecoverable read() failure: (%d) %s",
300 error, strerror(error));
305 logmsg("got 0 reading from stdin");
311 } while((size_t)nread < nbytes);
314 logmsg("read %zd bytes", nread);
320 * fullwrite is a wrapper around the write() function. This will repeat the
321 * call to write() until it actually has written the complete number of bytes
322 * indicated in nbytes or it fails with a condition that cannot be handled
323 * with a simple retry of the write call.
326 static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
333 wc = write(filedes, (unsigned char *)buffer + nwrite, nbytes - nwrite);
335 if(got_exit_signal) {
336 logmsg("signalled to die");
342 if((error == EINTR) || (error == EAGAIN))
344 logmsg("writing to file descriptor: %d,", filedes);
345 logmsg("unrecoverable write() failure: (%d) %s",
346 error, strerror(error));
351 logmsg("put 0 writing to stdout");
357 } while((size_t)nwrite < nbytes);
360 logmsg("wrote %zd bytes", nwrite);
366 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
367 * blocking function that will only return TRUE when nbytes have actually been
368 * read or FALSE when an unrecoverable error has been detected. Failure of this
369 * function is an indication that the sockfilt process should terminate.
372 static bool read_stdin(void *buffer, size_t nbytes)
374 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
375 if(nread != (ssize_t)nbytes) {
376 logmsg("exiting...");
383 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
384 * blocking function that will only return TRUE when nbytes have actually been
385 * written or FALSE when an unrecoverable error has been detected. Failure of
386 * this function is an indication that the sockfilt process should terminate.
389 static bool write_stdout(const void *buffer, size_t nbytes)
391 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
392 if(nwrite != (ssize_t)nbytes) {
393 logmsg("exiting...");
399 static void lograw(unsigned char *buffer, ssize_t len)
403 unsigned char *ptr = buffer;
407 for(i=0; i<len; i++) {
410 sprintf(optr, "\\n");
415 sprintf(optr, "\\r");
420 sprintf(optr, "%c", (ISGRAPH(ptr[i]) || ptr[i]==0x20) ?ptr[i]:'.');
427 logmsg("'%s'", data);
433 logmsg("'%s'", data);
438 * WinSock select() does not support standard file descriptors,
439 * it can only check SOCKETs. The following function is an attempt
440 * to re-create a select() function with support for other handle types.
442 * select() function with support for WINSOCK2 sockets and all
443 * other handle types supported by WaitForMultipleObjectsEx().
445 * TODO: Differentiate between read/write/except for non-SOCKET handles.
447 * http://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
448 * http://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
450 static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
451 fd_set *exceptfds, struct timeval *timeout)
454 DWORD milliseconds, wait, idx, avail, events, inputs;
455 WSAEVENT wsaevent, *wsaevents;
456 WSANETWORKEVENTS wsanetevents;
457 INPUT_RECORD *inputrecords;
458 HANDLE handle, *handles;
459 curl_socket_t sock, *fdarr, *wsasocks;
461 DWORD nfd = 0, wsa = 0;
464 /* check if the input value is valid */
470 /* check if we got descriptors, sleep in case we got none */
472 Sleep((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
476 /* allocate internal array for the original input handles */
477 fdarr = malloc(nfds * sizeof(curl_socket_t));
483 /* allocate internal array for the internal event handles */
484 handles = malloc(nfds * sizeof(HANDLE));
485 if(handles == NULL) {
490 /* allocate internal array for the internal socket handles */
491 wsasocks = malloc(nfds * sizeof(curl_socket_t));
492 if(wsasocks == NULL) {
497 /* allocate internal array for the internal WINSOCK2 events */
498 wsaevents = malloc(nfds * sizeof(WSAEVENT));
499 if(wsaevents == NULL) {
504 /* loop over the handles in the input descriptor sets */
505 for(fds = 0; fds < nfds; fds++) {
509 if(FD_ISSET(fds, readfds))
510 networkevents |= FD_READ|FD_ACCEPT|FD_CLOSE;
512 if(FD_ISSET(fds, writefds))
513 networkevents |= FD_WRITE|FD_CONNECT;
515 if(FD_ISSET(fds, exceptfds))
516 networkevents |= FD_OOB;
518 /* only wait for events for which we actually care */
520 fdarr[nfd] = curlx_sitosk(fds);
521 if(fds == fileno(stdin)) {
522 handles[nfd] = GetStdHandle(STD_INPUT_HANDLE);
524 else if(fds == fileno(stdout)) {
525 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
527 else if(fds == fileno(stderr)) {
528 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
531 wsaevent = WSACreateEvent();
532 if(wsaevent != WSA_INVALID_EVENT) {
533 error = WSAEventSelect(fds, wsaevent, networkevents);
534 if(error != SOCKET_ERROR) {
535 handles[nfd] = wsaevent;
536 wsasocks[wsa] = curlx_sitosk(fds);
537 wsaevents[wsa] = wsaevent;
541 handles[nfd] = (HANDLE) curlx_sitosk(fds);
542 WSACloseEvent(wsaevent);
550 /* convert struct timeval to milliseconds */
552 milliseconds = ((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
555 milliseconds = INFINITE;
558 /* wait for one of the internal handles to trigger */
559 wait = WaitForMultipleObjectsEx(nfd, handles, FALSE, milliseconds, FALSE);
561 /* loop over the internal handles returned in the descriptors */
562 for(idx = 0; idx < nfd; idx++) {
563 handle = handles[idx];
565 fds = curlx_sktosi(sock);
567 /* check if the current internal handle was triggered */
568 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) >= idx &&
569 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
570 /* try to handle the event with STD* handle functions */
571 if(fds == fileno(stdin)) {
572 /* check if there is no data in the input buffer */
574 /* check if we are getting data from a PIPE */
575 if(!GetConsoleMode(handle, &avail)) {
576 /* check if there is no data from PIPE input */
577 if(!PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL))
580 FD_CLR(sock, readfds);
581 } /* check if there is no data from keyboard input */
582 else if (!_kbhit()) {
583 /* check if there are INPUT_RECORDs in the input buffer */
584 if(GetNumberOfConsoleInputEvents(handle, &events)) {
586 /* remove INPUT_RECORDs from the input buffer */
587 inputrecords = (INPUT_RECORD*)malloc(events *
588 sizeof(INPUT_RECORD));
590 if(!ReadConsoleInput(handle, inputrecords,
596 /* check if we got all inputs, otherwise clear buffer */
598 FlushConsoleInputBuffer(handle);
602 /* remove from descriptor set since there is no real data */
603 FD_CLR(sock, readfds);
607 /* stdin is never ready for write or exceptional */
608 FD_CLR(sock, writefds);
609 FD_CLR(sock, exceptfds);
611 else if(fds == fileno(stdout) || fds == fileno(stderr)) {
612 /* stdout and stderr are never ready for read or exceptional */
613 FD_CLR(sock, readfds);
614 FD_CLR(sock, exceptfds);
617 /* try to handle the event with the WINSOCK2 functions */
618 error = WSAEnumNetworkEvents(fds, NULL, &wsanetevents);
619 if(error != SOCKET_ERROR) {
620 /* remove from descriptor set if not ready for read/accept/close */
621 if(!(wsanetevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
622 FD_CLR(sock, readfds);
624 /* remove from descriptor set if not ready for write/connect */
625 if(!(wsanetevents.lNetworkEvents & (FD_WRITE|FD_CONNECT)))
626 FD_CLR(sock, writefds);
628 /* remove from descriptor set if not exceptional */
629 if(!(wsanetevents.lNetworkEvents & FD_OOB))
630 FD_CLR(sock, exceptfds);
634 /* check if the event has not been filtered using specific tests */
635 if(FD_ISSET(sock, readfds) || FD_ISSET(sock, writefds) ||
636 FD_ISSET(sock, exceptfds)) {
641 /* remove from all descriptor sets since this handle did not trigger */
642 FD_CLR(sock, readfds);
643 FD_CLR(sock, writefds);
644 FD_CLR(sock, exceptfds);
648 for(idx = 0; idx < wsa; idx++) {
649 WSAEventSelect(wsasocks[idx], NULL, 0);
650 WSACloseEvent(wsaevents[idx]);
660 #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
661 #endif /* USE_WINSOCK */
664 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
666 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
669 static bool juggle(curl_socket_t *sockfdp,
670 curl_socket_t listenfd,
673 struct timeval timeout;
677 curl_socket_t sockfd = CURL_SOCKET_BAD;
680 ssize_t nread_socket;
681 ssize_t bytes_written;
685 /* 'buffer' is this excessively large only to be able to support things like
686 test 1003 which tests exceedingly large server response lines */
687 unsigned char buffer[17010];
690 if(got_exit_signal) {
691 logmsg("signalled to die, exiting...");
696 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
697 parent ftpserver process has died without killing its sockfilt children */
699 logmsg("process becomes orphan, exiting");
704 timeout.tv_sec = 120;
711 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
719 /* there's always a socket to wait for */
720 FD_SET(sockfd, &fds_read);
724 case PASSIVE_CONNECT:
727 if(CURL_SOCKET_BAD == sockfd) {
728 /* eeek, we are supposedly connected and then this cannot be -1 ! */
729 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
730 maxfd = 0; /* stdin */
733 /* there's always a socket to wait for */
734 FD_SET(sockfd, &fds_read);
742 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
743 if(CURL_SOCKET_BAD != sockfd) {
744 FD_SET(sockfd, &fds_read);
748 logmsg("No socket to read on");
753 case ACTIVE_DISCONNECT:
755 logmsg("disconnected, no socket to read on");
757 sockfd = CURL_SOCKET_BAD;
760 } /* switch(*mode) */
765 /* select() blocking behavior call on blocking descriptors please */
767 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
769 if(got_exit_signal) {
770 logmsg("signalled to die, exiting...");
774 } while((rc == -1) && ((error = errno) == EINTR));
777 logmsg("select() failed with error: (%d) %s",
778 error, strerror(error));
787 if(FD_ISSET(fileno(stdin), &fds_read)) {
788 /* read from stdin, commands/data to be dealt with and possibly passed on
793 4 letter command + LF [mandatory]
795 4-digit hexadecimal data length + LF [if the command takes data]
796 data [the data being as long as set above]
800 DATA - plain pass-thru data
803 if(!read_stdin(buffer, 5))
806 logmsg("Received %c%c%c%c (on stdin)",
807 buffer[0], buffer[1], buffer[2], buffer[3] );
809 if(!memcmp("PING", buffer, 4)) {
810 /* send reply on stdout, just proving we are alive */
811 if(!write_stdout("PONG\n", 5))
815 else if(!memcmp("PORT", buffer, 4)) {
816 /* Question asking us what PORT number we are listening to.
817 Replies to PORT with "IPv[num]/[port]" */
818 sprintf((char *)buffer, "%s/%hu\n", ipv_inuse, port);
819 buffer_len = (ssize_t)strlen((char *)buffer);
820 snprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
821 if(!write_stdout(data, 10))
823 if(!write_stdout(buffer, buffer_len))
826 else if(!memcmp("QUIT", buffer, 4)) {
831 else if(!memcmp("DATA", buffer, 4)) {
832 /* data IN => data OUT */
834 if(!read_stdin(buffer, 5))
839 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
840 if (buffer_len > (ssize_t)sizeof(buffer)) {
841 logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
842 "(%zd bytes)", sizeof(buffer), buffer_len);
845 logmsg("> %zd bytes data, server => client", buffer_len);
847 if(!read_stdin(buffer, buffer_len))
850 lograw(buffer, buffer_len);
852 if(*mode == PASSIVE_LISTEN) {
853 logmsg("*** We are disconnected!");
854 if(!write_stdout("DISC\n", 5))
858 /* send away on the socket */
859 bytes_written = swrite(sockfd, buffer, buffer_len);
860 if(bytes_written != buffer_len) {
861 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
862 buffer_len, bytes_written);
866 else if(!memcmp("DISC", buffer, 4)) {
868 if(!write_stdout("DISC\n", 5))
870 if(sockfd != CURL_SOCKET_BAD) {
871 logmsg("====> Client forcibly disconnected");
873 *sockfdp = CURL_SOCKET_BAD;
874 if(*mode == PASSIVE_CONNECT)
875 *mode = PASSIVE_LISTEN;
877 *mode = ACTIVE_DISCONNECT;
880 logmsg("attempt to close already dead connection");
886 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
888 curl_socket_t newfd = CURL_SOCKET_BAD; /* newly accepted socket */
890 if(*mode == PASSIVE_LISTEN) {
891 /* there's no stream set up yet, this is an indication that there's a
892 client connecting. */
893 newfd = accept(sockfd, NULL, NULL);
894 if(CURL_SOCKET_BAD == newfd) {
896 logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
897 sockfd, error, strerror(error));
900 logmsg("====> Client connect");
901 if(!write_stdout("CNCT\n", 5))
903 *sockfdp = newfd; /* store the new socket */
904 *mode = PASSIVE_CONNECT; /* we have connected */
909 /* read from socket, pass on data to stdout */
910 nread_socket = sread(sockfd, buffer, sizeof(buffer));
912 if(nread_socket <= 0) {
913 logmsg("====> Client disconnect");
914 if(!write_stdout("DISC\n", 5))
917 *sockfdp = CURL_SOCKET_BAD;
918 if(*mode == PASSIVE_CONNECT)
919 *mode = PASSIVE_LISTEN;
921 *mode = ACTIVE_DISCONNECT;
925 snprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
926 if(!write_stdout(data, 10))
928 if(!write_stdout(buffer, nread_socket))
931 logmsg("< %zd bytes data, client => server", nread_socket);
932 lograw(buffer, nread_socket);
938 static curl_socket_t sockdaemon(curl_socket_t sock,
939 unsigned short *listenport)
941 /* passive daemon style */
942 srvr_sockaddr_union_t listener;
954 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
955 (void *)&flag, sizeof(flag));
958 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
959 error, strerror(error));
963 /* should not happen */
965 logmsg("wait_ms() failed with error: (%d) %s",
966 error, strerror(error));
968 return CURL_SOCKET_BAD;
970 if(got_exit_signal) {
971 logmsg("signalled to die, exiting...");
973 return CURL_SOCKET_BAD;
976 delay *= 2; /* double the sleep for next attempt */
979 } while(rc && maxretr--);
982 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
983 attempt, totdelay, error, strerror(error));
984 logmsg("Continuing anyway...");
987 /* When the specified listener port is zero, it is actually a
988 request to let the system choose a non-zero available port. */
993 memset(&listener.sa4, 0, sizeof(listener.sa4));
994 listener.sa4.sin_family = AF_INET;
995 listener.sa4.sin_addr.s_addr = INADDR_ANY;
996 listener.sa4.sin_port = htons(*listenport);
997 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
1001 memset(&listener.sa6, 0, sizeof(listener.sa6));
1002 listener.sa6.sin6_family = AF_INET6;
1003 listener.sa6.sin6_addr = in6addr_any;
1004 listener.sa6.sin6_port = htons(*listenport);
1005 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1007 #endif /* ENABLE_IPV6 */
1010 logmsg("Error binding socket on port %hu: (%d) %s",
1011 *listenport, error, strerror(error));
1013 return CURL_SOCKET_BAD;
1017 /* The system was supposed to choose a port number, figure out which
1018 port we actually got and update the listener port value with it. */
1019 curl_socklen_t la_size;
1020 srvr_sockaddr_union_t localaddr;
1024 la_size = sizeof(localaddr.sa4);
1027 la_size = sizeof(localaddr.sa6);
1029 memset(&localaddr.sa, 0, (size_t)la_size);
1030 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1032 logmsg("getsockname() failed with error: (%d) %s",
1033 error, strerror(error));
1035 return CURL_SOCKET_BAD;
1037 switch (localaddr.sa.sa_family) {
1039 *listenport = ntohs(localaddr.sa4.sin_port);
1043 *listenport = ntohs(localaddr.sa6.sin6_port);
1050 /* Real failure, listener port shall not be zero beyond this point. */
1051 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1052 logmsg("A valid reason for this failure is a binary built without");
1053 logmsg("proper network library linkage. This might not be the only");
1054 logmsg("reason, but double check it before anything else.");
1056 return CURL_SOCKET_BAD;
1060 /* bindonly option forces no listening */
1062 logmsg("instructed to bind port without listening");
1066 /* start accepting connections */
1067 rc = listen(sock, 5);
1070 logmsg("listen(%d, 5) failed with error: (%d) %s",
1071 sock, error, strerror(error));
1073 return CURL_SOCKET_BAD;
1080 int main(int argc, char *argv[])
1082 srvr_sockaddr_union_t me;
1083 curl_socket_t sock = CURL_SOCKET_BAD;
1084 curl_socket_t msgsock = CURL_SOCKET_BAD;
1085 int wrotepidfile = 0;
1086 char *pidname= (char *)".sockfilt.pid";
1091 enum sockmode mode = PASSIVE_LISTEN; /* default */
1092 const char *addr = NULL;
1095 if(!strcmp("--version", argv[arg])) {
1096 printf("sockfilt IPv4%s\n",
1105 else if(!strcmp("--verbose", argv[arg])) {
1109 else if(!strcmp("--pidfile", argv[arg])) {
1112 pidname = argv[arg++];
1114 else if(!strcmp("--logfile", argv[arg])) {
1117 serverlogfile = argv[arg++];
1119 else if(!strcmp("--ipv6", argv[arg])) {
1126 else if(!strcmp("--ipv4", argv[arg])) {
1127 /* for completeness, we support this option as well */
1134 else if(!strcmp("--bindonly", argv[arg])) {
1138 else if(!strcmp("--port", argv[arg])) {
1142 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1143 if((endptr != argv[arg] + strlen(argv[arg])) ||
1144 ((ulnum != 0UL) && ((ulnum < 1025UL) || (ulnum > 65535UL)))) {
1145 fprintf(stderr, "sockfilt: invalid --port argument (%s)\n",
1149 port = curlx_ultous(ulnum);
1153 else if(!strcmp("--connect", argv[arg])) {
1154 /* Asked to actively connect to the specified local port instead of
1155 doing a passive server-style listening. */
1159 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1160 if((endptr != argv[arg] + strlen(argv[arg])) ||
1161 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1162 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1166 connectport = curlx_ultous(ulnum);
1170 else if(!strcmp("--addr", argv[arg])) {
1171 /* Set an IP address to use with --connect; otherwise use localhost */
1179 puts("Usage: sockfilt [option]\n"
1182 " --logfile [file]\n"
1183 " --pidfile [file]\n"
1188 " --connect [port]\n"
1189 " --addr [address]");
1196 atexit(win32_cleanup);
1198 setmode(fileno(stdin), O_BINARY);
1199 setmode(fileno(stdout), O_BINARY);
1200 setmode(fileno(stderr), O_BINARY);
1203 install_signal_handlers();
1208 sock = socket(AF_INET, SOCK_STREAM, 0);
1211 sock = socket(AF_INET6, SOCK_STREAM, 0);
1214 if(CURL_SOCKET_BAD == sock) {
1216 logmsg("Error creating socket: (%d) %s",
1217 error, strerror(error));
1218 write_stdout("FAIL\n", 5);
1219 goto sockfilt_cleanup;
1223 /* Active mode, we should connect to the given port number */
1228 memset(&me.sa4, 0, sizeof(me.sa4));
1229 me.sa4.sin_family = AF_INET;
1230 me.sa4.sin_port = htons(connectport);
1231 me.sa4.sin_addr.s_addr = INADDR_ANY;
1234 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1236 rc = connect(sock, &me.sa, sizeof(me.sa4));
1240 memset(&me.sa6, 0, sizeof(me.sa6));
1241 me.sa6.sin6_family = AF_INET6;
1242 me.sa6.sin6_port = htons(connectport);
1245 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1247 rc = connect(sock, &me.sa, sizeof(me.sa6));
1249 #endif /* ENABLE_IPV6 */
1252 logmsg("Error connecting to port %hu: (%d) %s",
1253 connectport, error, strerror(error));
1254 write_stdout("FAIL\n", 5);
1255 goto sockfilt_cleanup;
1257 logmsg("====> Client connect");
1258 msgsock = sock; /* use this as stream */
1261 /* passive daemon style */
1262 sock = sockdaemon(sock, &port);
1263 if(CURL_SOCKET_BAD == sock) {
1264 write_stdout("FAIL\n", 5);
1265 goto sockfilt_cleanup;
1267 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1270 logmsg("Running %s version", ipv_inuse);
1273 logmsg("Connected to port %hu", connectport);
1275 logmsg("Bound without listening on port %hu", port);
1277 logmsg("Listening on port %hu", port);
1279 wrotepidfile = write_pidfile(pidname);
1281 write_stdout("FAIL\n", 5);
1282 goto sockfilt_cleanup;
1286 juggle_again = juggle(&msgsock, sock, &mode);
1287 } while(juggle_again);
1291 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1294 if(sock != CURL_SOCKET_BAD)
1300 restore_signal_handlers();
1302 if(got_exit_signal) {
1303 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1305 * To properly set the return status of the process we
1306 * must raise the same signal SIGINT or SIGTERM that we
1307 * caught and let the old handler take care of it.
1312 logmsg("============> sockfilt quits");