1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2012, 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 #define ENABLE_CURLX_PRINTF
97 /* make the curlx header define all printf() functions to use the curlx_*
99 #include "curlx.h" /* from the private lib dir */
101 #include "inet_pton.h"
103 #include "server_sockaddr.h"
105 /* include memdebug.h last */
106 #include "memdebug.h"
108 #define DEFAULT_PORT 8999
110 #ifndef DEFAULT_LOGFILE
111 #define DEFAULT_LOGFILE "log/sockfilt.log"
114 const char *serverlogfile = DEFAULT_LOGFILE;
116 static bool verbose = FALSE;
117 static bool bind_only = FALSE;
119 static bool use_ipv6 = FALSE;
121 static const char *ipv_inuse = "IPv4";
122 static unsigned short port = DEFAULT_PORT;
123 static unsigned short connectport = 0; /* if non-zero, we activate this mode */
126 PASSIVE_LISTEN, /* as a server waiting for connections */
127 PASSIVE_CONNECT, /* as a server, connected to a client */
128 ACTIVE, /* as a client, connected to a server */
129 ACTIVE_DISCONNECT /* as a client, disconnected from server */
132 /* do-nothing macro replacement for systems which lack siginterrupt() */
134 #ifndef HAVE_SIGINTERRUPT
135 #define siginterrupt(x,y) do {} while(0)
138 /* vars used to keep around previous signal handlers */
140 typedef RETSIGTYPE (*SIGHANDLER_T)(int);
143 static SIGHANDLER_T old_sighup_handler = SIG_ERR;
147 static SIGHANDLER_T old_sigpipe_handler = SIG_ERR;
151 static SIGHANDLER_T old_sigalrm_handler = SIG_ERR;
155 static SIGHANDLER_T old_sigint_handler = SIG_ERR;
159 static SIGHANDLER_T old_sigterm_handler = SIG_ERR;
162 /* var which if set indicates that the program should finish execution */
164 SIG_ATOMIC_T got_exit_signal = 0;
166 /* if next is set indicates the first signal handled in exit_signal_handler */
168 static volatile int exit_signal = 0;
170 /* signal handler that will be triggered to indicate that the program
171 should finish its execution in a controlled manner as soon as possible.
172 The first time this is called it will set got_exit_signal to one and
173 store in exit_signal the signal that triggered its execution. */
175 static RETSIGTYPE exit_signal_handler(int signum)
177 int old_errno = ERRNO;
178 if(got_exit_signal == 0) {
180 exit_signal = signum;
182 (void)signal(signum, exit_signal_handler);
183 SET_ERRNO(old_errno);
186 static void install_signal_handlers(void)
189 /* ignore SIGHUP signal */
190 if((old_sighup_handler = signal(SIGHUP, SIG_IGN)) == SIG_ERR)
191 logmsg("cannot install SIGHUP handler: %s", strerror(ERRNO));
194 /* ignore SIGPIPE signal */
195 if((old_sigpipe_handler = signal(SIGPIPE, SIG_IGN)) == SIG_ERR)
196 logmsg("cannot install SIGPIPE handler: %s", strerror(ERRNO));
199 /* ignore SIGALRM signal */
200 if((old_sigalrm_handler = signal(SIGALRM, SIG_IGN)) == SIG_ERR)
201 logmsg("cannot install SIGALRM handler: %s", strerror(ERRNO));
204 /* handle SIGINT signal with our exit_signal_handler */
205 if((old_sigint_handler = signal(SIGINT, exit_signal_handler)) == SIG_ERR)
206 logmsg("cannot install SIGINT handler: %s", strerror(ERRNO));
208 siginterrupt(SIGINT, 1);
211 /* handle SIGTERM signal with our exit_signal_handler */
212 if((old_sigterm_handler = signal(SIGTERM, exit_signal_handler)) == SIG_ERR)
213 logmsg("cannot install SIGTERM handler: %s", strerror(ERRNO));
215 siginterrupt(SIGTERM, 1);
219 static void restore_signal_handlers(void)
222 if(SIG_ERR != old_sighup_handler)
223 (void)signal(SIGHUP, old_sighup_handler);
226 if(SIG_ERR != old_sigpipe_handler)
227 (void)signal(SIGPIPE, old_sigpipe_handler);
230 if(SIG_ERR != old_sigalrm_handler)
231 (void)signal(SIGALRM, old_sigalrm_handler);
234 if(SIG_ERR != old_sigint_handler)
235 (void)signal(SIGINT, old_sigint_handler);
238 if(SIG_ERR != old_sigterm_handler)
239 (void)signal(SIGTERM, old_sigterm_handler);
244 * fullread is a wrapper around the read() function. This will repeat the call
245 * to read() until it actually has read the complete number of bytes indicated
246 * in nbytes or it fails with a condition that cannot be handled with a simple
247 * retry of the read call.
250 static ssize_t fullread(int filedes, void *buffer, size_t nbytes)
257 rc = read(filedes, (unsigned char *)buffer + nread, nbytes - nread);
259 if(got_exit_signal) {
260 logmsg("signalled to die");
266 if((error == EINTR) || (error == EAGAIN))
268 logmsg("unrecoverable read() failure: (%d) %s",
269 error, strerror(error));
274 logmsg("got 0 reading from stdin");
280 } while((size_t)nread < nbytes);
283 logmsg("read %zd bytes", nread);
289 * fullwrite is a wrapper around the write() function. This will repeat the
290 * call to write() until it actually has written the complete number of bytes
291 * indicated in nbytes or it fails with a condition that cannot be handled
292 * with a simple retry of the write call.
295 static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
302 wc = write(filedes, (unsigned char *)buffer + nwrite, nbytes - nwrite);
304 if(got_exit_signal) {
305 logmsg("signalled to die");
311 if((error == EINTR) || (error == EAGAIN))
313 logmsg("unrecoverable write() failure: (%d) %s",
314 error, strerror(error));
319 logmsg("put 0 writing to stdout");
325 } while((size_t)nwrite < nbytes);
328 logmsg("wrote %zd bytes", nwrite);
334 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
335 * blocking function that will only return TRUE when nbytes have actually been
336 * read or FALSE when an unrecoverable error has been detected. Failure of this
337 * function is an indication that the sockfilt process should terminate.
340 static bool read_stdin(void *buffer, size_t nbytes)
342 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
343 if(nread != (ssize_t)nbytes) {
344 logmsg("exiting...");
351 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
352 * blocking function that will only return TRUE when nbytes have actually been
353 * written or FALSE when an unrecoverable error has been detected. Failure of
354 * this function is an indication that the sockfilt process should terminate.
357 static bool write_stdout(const void *buffer, size_t nbytes)
359 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
360 if(nwrite != (ssize_t)nbytes) {
361 logmsg("exiting...");
367 static void lograw(unsigned char *buffer, ssize_t len)
371 unsigned char *ptr = buffer;
375 for(i=0; i<len; i++) {
378 sprintf(optr, "\\n");
383 sprintf(optr, "\\r");
388 sprintf(optr, "%c", (ISGRAPH(ptr[i]) || ptr[i]==0x20) ?ptr[i]:'.');
395 logmsg("'%s'", data);
401 logmsg("'%s'", data);
405 * WinSock select() does not support standard file descriptors,
406 * it can only check SOCKETs. The following function is an attempt
407 * to re-create a select() function with support for other handle types.
411 * select() function with support for WINSOCK2 sockets and all
412 * other handle types supported by WaitForMultipleObjectsEx().
414 * TODO: Differentiate between read/write/except for non-SOCKET handles.
416 * http://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
417 * http://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
419 static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
420 fd_set *exceptfds, struct timeval *timeout)
423 DWORD milliseconds, wait, idx, avail, events, inputs;
424 WSAEVENT wsaevent, *wsaevents;
425 WSANETWORKEVENTS wsanetevents;
426 INPUT_RECORD *inputrecords;
427 HANDLE handle, *handles;
428 curl_socket_t *fdarr, *wsasocks;
430 DWORD nfd = 0, wsa = 0;
433 /* check if the input value is valid */
435 SET_SOCKERRNO(EINVAL);
439 /* check if we got descriptors, sleep in case we got none */
441 Sleep((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
445 /* allocate internal array for the original input handles */
446 fdarr = malloc(nfds * sizeof(curl_socket_t));
448 SET_SOCKERRNO(ENOMEM);
452 /* allocate internal array for the internal event handles */
453 handles = malloc(nfds * sizeof(HANDLE));
454 if(handles == NULL) {
455 SET_SOCKERRNO(ENOMEM);
459 /* allocate internal array for the internal socket handles */
460 wsasocks = malloc(nfds * sizeof(curl_socket_t));
461 if(wsasocks == NULL) {
462 SET_SOCKERRNO(ENOMEM);
466 /* allocate internal array for the internal WINSOCK2 events */
467 wsaevents = malloc(nfds * sizeof(WSAEVENT));
468 if(wsaevents == NULL) {
469 SET_SOCKERRNO(ENOMEM);
473 /* loop over the handles in the input descriptor sets */
474 for(fds = 0; fds < nfds; fds++) {
478 if(FD_ISSET(fds, readfds))
479 networkevents |= FD_READ|FD_ACCEPT|FD_CLOSE;
481 if(FD_ISSET(fds, writefds))
482 networkevents |= FD_WRITE|FD_CONNECT;
484 if(FD_ISSET(fds, exceptfds))
485 networkevents |= FD_OOB;
487 /* only wait for events for which we actually care */
489 fdarr[nfd] = (curl_socket_t)fds;
490 if(fds == fileno(stdin)) {
491 handles[nfd] = GetStdHandle(STD_INPUT_HANDLE);
493 else if(fds == fileno(stdout)) {
494 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
496 else if(fds == fileno(stderr)) {
497 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
500 wsaevent = WSACreateEvent();
501 if(wsaevent != WSA_INVALID_EVENT) {
502 error = WSAEventSelect(fds, wsaevent, networkevents);
503 if(error != SOCKET_ERROR) {
504 handles[nfd] = wsaevent;
505 wsasocks[wsa] = (curl_socket_t)fds;
506 wsaevents[wsa] = wsaevent;
510 handles[nfd] = (HANDLE)fds;
511 WSACloseEvent(wsaevent);
519 /* convert struct timeval to milliseconds */
521 milliseconds = ((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
524 milliseconds = INFINITE;
527 /* wait for one of the internal handles to trigger */
528 wait = WaitForMultipleObjectsEx(nfd, handles, FALSE, milliseconds, FALSE);
530 /* loop over the internal handles returned in the descriptors */
531 for(idx = 0; idx < nfd; idx++) {
533 handle = handles[idx];
535 /* check if the current internal handle was triggered */
536 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) >= idx &&
537 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
538 /* try to handle the event with STD* handle functions */
539 if(fds == fileno(stdin)) {
540 /* check if there is no data in the input buffer */
542 /* check if we are getting data from a PIPE */
543 if(!GetConsoleMode(handle, &avail)) {
544 /* check if there is no data from PIPE input */
545 if(!PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL))
548 FD_CLR(fds, readfds);
549 } /* check if there is no data from keyboard input */
550 else if (!_kbhit()) {
551 /* check if there are INPUT_RECORDs in the input buffer */
552 if(GetNumberOfConsoleInputEvents(handle, &events)) {
554 /* remove INPUT_RECORDs from the input buffer */
555 inputrecords = (INPUT_RECORD*)malloc(events *
556 sizeof(INPUT_RECORD));
558 if(!ReadConsoleInput(handle, inputrecords,
564 /* check if we got all inputs, otherwise clear buffer */
566 FlushConsoleInputBuffer(handle);
570 /* remove from descriptor set since there is no real data */
571 FD_CLR(fds, readfds);
575 /* stdin is never ready for write or exceptional */
576 FD_CLR(fds, writefds);
577 FD_CLR(fds, exceptfds);
579 else if(fds == fileno(stdout) || fds == fileno(stderr)) {
580 /* stdout and stderr are never ready for read or exceptional */
581 FD_CLR(fds, readfds);
582 FD_CLR(fds, exceptfds);
585 /* try to handle the event with the WINSOCK2 functions */
586 error = WSAEnumNetworkEvents(fds, NULL, &wsanetevents);
587 if(error != SOCKET_ERROR) {
588 /* remove from descriptor set if not ready for read/accept/close */
589 if(!(wsanetevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
590 FD_CLR(fds, readfds);
592 /* remove from descriptor set if not ready for write/connect */
593 if(!(wsanetevents.lNetworkEvents & (FD_WRITE|FD_CONNECT)))
594 FD_CLR(fds, writefds);
596 /* remove from descriptor set if not exceptional */
597 if(!(wsanetevents.lNetworkEvents & FD_OOB))
598 FD_CLR(fds, exceptfds);
602 /* check if the event has not been filtered using specific tests */
603 if(FD_ISSET(fds, readfds) || FD_ISSET(fds, writefds) ||
604 FD_ISSET(fds, exceptfds)) {
609 /* remove from all descriptor sets since this handle did not trigger */
610 FD_CLR(fds, readfds);
611 FD_CLR(fds, writefds);
612 FD_CLR(fds, exceptfds);
616 for(idx = 0; idx < wsa; idx++) {
617 WSAEventSelect(wsasocks[idx], NULL, 0);
618 WSACloseEvent(wsaevents[idx]);
628 #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
632 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
634 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
637 static bool juggle(curl_socket_t *sockfdp,
638 curl_socket_t listenfd,
641 struct timeval timeout;
645 curl_socket_t sockfd = CURL_SOCKET_BAD;
648 ssize_t nread_socket;
649 ssize_t bytes_written;
653 /* 'buffer' is this excessively large only to be able to support things like
654 test 1003 which tests exceedingly large server response lines */
655 unsigned char buffer[17010];
658 if(got_exit_signal) {
659 logmsg("signalled to die, exiting...");
664 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
665 parent ftpserver process has died without killing its sockfilt children */
667 logmsg("process becomes orphan, exiting");
672 timeout.tv_sec = 120;
679 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
687 /* there's always a socket to wait for */
688 FD_SET(sockfd, &fds_read);
692 case PASSIVE_CONNECT:
695 if(CURL_SOCKET_BAD == sockfd) {
696 /* eeek, we are supposedly connected and then this cannot be -1 ! */
697 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
698 maxfd = 0; /* stdin */
701 /* there's always a socket to wait for */
702 FD_SET(sockfd, &fds_read);
710 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
711 if(CURL_SOCKET_BAD != sockfd) {
712 FD_SET(sockfd, &fds_read);
716 logmsg("No socket to read on");
721 case ACTIVE_DISCONNECT:
723 logmsg("disconnected, no socket to read on");
725 sockfd = CURL_SOCKET_BAD;
728 } /* switch(*mode) */
733 /* select() blocking behavior call on blocking descriptors please */
735 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
737 if(got_exit_signal) {
738 logmsg("signalled to die, exiting...");
742 } while((rc == -1) && ((error = SOCKERRNO) == EINTR));
745 logmsg("select() failed with error: (%d) %s",
746 error, strerror(error));
755 if(FD_ISSET(fileno(stdin), &fds_read)) {
756 /* read from stdin, commands/data to be dealt with and possibly passed on
761 4 letter command + LF [mandatory]
763 4-digit hexadecimal data length + LF [if the command takes data]
764 data [the data being as long as set above]
768 DATA - plain pass-thru data
771 if(!read_stdin(buffer, 5))
774 logmsg("Received %c%c%c%c (on stdin)",
775 buffer[0], buffer[1], buffer[2], buffer[3] );
777 if(!memcmp("PING", buffer, 4)) {
778 /* send reply on stdout, just proving we are alive */
779 if(!write_stdout("PONG\n", 5))
783 else if(!memcmp("PORT", buffer, 4)) {
784 /* Question asking us what PORT number we are listening to.
785 Replies to PORT with "IPv[num]/[port]" */
786 sprintf((char *)buffer, "%s/%hu\n", ipv_inuse, port);
787 buffer_len = (ssize_t)strlen((char *)buffer);
788 snprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
789 if(!write_stdout(data, 10))
791 if(!write_stdout(buffer, buffer_len))
794 else if(!memcmp("QUIT", buffer, 4)) {
799 else if(!memcmp("DATA", buffer, 4)) {
800 /* data IN => data OUT */
802 if(!read_stdin(buffer, 5))
807 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
808 if (buffer_len > (ssize_t)sizeof(buffer)) {
809 logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
810 "(%zd bytes)", sizeof(buffer), buffer_len);
813 logmsg("> %zd bytes data, server => client", buffer_len);
815 if(!read_stdin(buffer, buffer_len))
818 lograw(buffer, buffer_len);
820 if(*mode == PASSIVE_LISTEN) {
821 logmsg("*** We are disconnected!");
822 if(!write_stdout("DISC\n", 5))
826 /* send away on the socket */
827 bytes_written = swrite(sockfd, buffer, buffer_len);
828 if(bytes_written != buffer_len) {
829 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
830 buffer_len, bytes_written);
834 else if(!memcmp("DISC", buffer, 4)) {
836 if(!write_stdout("DISC\n", 5))
838 if(sockfd != CURL_SOCKET_BAD) {
839 logmsg("====> Client forcibly disconnected");
841 *sockfdp = CURL_SOCKET_BAD;
842 if(*mode == PASSIVE_CONNECT)
843 *mode = PASSIVE_LISTEN;
845 *mode = ACTIVE_DISCONNECT;
848 logmsg("attempt to close already dead connection");
854 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
856 if(*mode == PASSIVE_LISTEN) {
857 /* there's no stream set up yet, this is an indication that there's a
858 client connecting. */
860 sockfd = accept(listenfd, NULL, NULL);
861 if(CURL_SOCKET_BAD == sockfd) {
863 logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
864 listenfd, error, strerror(error));
867 logmsg("====> Client connect");
868 if(!write_stdout("CNCT\n", 5))
870 *sockfdp = sockfd; /* store the new socket */
871 *mode = PASSIVE_CONNECT; /* we have connected */
876 /* read from socket, pass on data to stdout */
877 nread_socket = sread(sockfd, buffer, sizeof(buffer));
879 if(nread_socket <= 0) {
880 logmsg("====> Client disconnect");
881 if(!write_stdout("DISC\n", 5))
884 *sockfdp = CURL_SOCKET_BAD;
885 if(*mode == PASSIVE_CONNECT)
886 *mode = PASSIVE_LISTEN;
888 *mode = ACTIVE_DISCONNECT;
892 snprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
893 if(!write_stdout(data, 10))
895 if(!write_stdout(buffer, nread_socket))
898 logmsg("< %zd bytes data, client => server", nread_socket);
899 lograw(buffer, nread_socket);
905 static curl_socket_t sockdaemon(curl_socket_t sock,
906 unsigned short *listenport)
908 /* passive daemon style */
909 srvr_sockaddr_union_t listener;
921 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
922 (void *)&flag, sizeof(flag));
925 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
926 error, strerror(error));
930 /* should not happen */
932 logmsg("wait_ms() failed with error: (%d) %s",
933 error, strerror(error));
935 return CURL_SOCKET_BAD;
937 if(got_exit_signal) {
938 logmsg("signalled to die, exiting...");
940 return CURL_SOCKET_BAD;
943 delay *= 2; /* double the sleep for next attempt */
946 } while(rc && maxretr--);
949 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
950 attempt, totdelay, error, strerror(error));
951 logmsg("Continuing anyway...");
954 /* When the specified listener port is zero, it is actually a
955 request to let the system choose a non-zero available port. */
960 memset(&listener.sa4, 0, sizeof(listener.sa4));
961 listener.sa4.sin_family = AF_INET;
962 listener.sa4.sin_addr.s_addr = INADDR_ANY;
963 listener.sa4.sin_port = htons(*listenport);
964 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
968 memset(&listener.sa6, 0, sizeof(listener.sa6));
969 listener.sa6.sin6_family = AF_INET6;
970 listener.sa6.sin6_addr = in6addr_any;
971 listener.sa6.sin6_port = htons(*listenport);
972 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
974 #endif /* ENABLE_IPV6 */
977 logmsg("Error binding socket on port %hu: (%d) %s",
978 *listenport, error, strerror(error));
980 return CURL_SOCKET_BAD;
984 /* The system was supposed to choose a port number, figure out which
985 port we actually got and update the listener port value with it. */
986 curl_socklen_t la_size;
987 srvr_sockaddr_union_t localaddr;
991 la_size = sizeof(localaddr.sa4);
994 la_size = sizeof(localaddr.sa6);
996 memset(&localaddr.sa, 0, (size_t)la_size);
997 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
999 logmsg("getsockname() failed with error: (%d) %s",
1000 error, strerror(error));
1002 return CURL_SOCKET_BAD;
1004 switch (localaddr.sa.sa_family) {
1006 *listenport = ntohs(localaddr.sa4.sin_port);
1010 *listenport = ntohs(localaddr.sa6.sin6_port);
1017 /* Real failure, listener port shall not be zero beyond this point. */
1018 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1019 logmsg("A valid reason for this failure is a binary built without");
1020 logmsg("proper network library linkage. This might not be the only");
1021 logmsg("reason, but double check it before anything else.");
1023 return CURL_SOCKET_BAD;
1027 /* bindonly option forces no listening */
1029 logmsg("instructed to bind port without listening");
1033 /* start accepting connections */
1034 rc = listen(sock, 5);
1037 logmsg("listen(%d, 5) failed with error: (%d) %s",
1038 sock, error, strerror(error));
1040 return CURL_SOCKET_BAD;
1047 int main(int argc, char *argv[])
1049 srvr_sockaddr_union_t me;
1050 curl_socket_t sock = CURL_SOCKET_BAD;
1051 curl_socket_t msgsock = CURL_SOCKET_BAD;
1052 int wrotepidfile = 0;
1053 char *pidname= (char *)".sockfilt.pid";
1058 enum sockmode mode = PASSIVE_LISTEN; /* default */
1059 const char *addr = NULL;
1062 if(!strcmp("--version", argv[arg])) {
1063 printf("sockfilt IPv4%s\n",
1072 else if(!strcmp("--verbose", argv[arg])) {
1076 else if(!strcmp("--pidfile", argv[arg])) {
1079 pidname = argv[arg++];
1081 else if(!strcmp("--logfile", argv[arg])) {
1084 serverlogfile = argv[arg++];
1086 else if(!strcmp("--ipv6", argv[arg])) {
1093 else if(!strcmp("--ipv4", argv[arg])) {
1094 /* for completeness, we support this option as well */
1101 else if(!strcmp("--bindonly", argv[arg])) {
1105 else if(!strcmp("--port", argv[arg])) {
1109 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1110 if((endptr != argv[arg] + strlen(argv[arg])) ||
1111 ((ulnum != 0UL) && ((ulnum < 1025UL) || (ulnum > 65535UL)))) {
1112 fprintf(stderr, "sockfilt: invalid --port argument (%s)\n",
1116 port = curlx_ultous(ulnum);
1120 else if(!strcmp("--connect", argv[arg])) {
1121 /* Asked to actively connect to the specified local port instead of
1122 doing a passive server-style listening. */
1126 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1127 if((endptr != argv[arg] + strlen(argv[arg])) ||
1128 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1129 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1133 connectport = curlx_ultous(ulnum);
1137 else if(!strcmp("--addr", argv[arg])) {
1138 /* Set an IP address to use with --connect; otherwise use localhost */
1146 puts("Usage: sockfilt [option]\n"
1149 " --logfile [file]\n"
1150 " --pidfile [file]\n"
1155 " --connect [port]\n"
1156 " --addr [address]");
1163 atexit(win32_cleanup);
1165 setmode(fileno(stdin), O_BINARY);
1166 setmode(fileno(stdout), O_BINARY);
1167 setmode(fileno(stderr), O_BINARY);
1170 install_signal_handlers();
1175 sock = socket(AF_INET, SOCK_STREAM, 0);
1178 sock = socket(AF_INET6, SOCK_STREAM, 0);
1181 if(CURL_SOCKET_BAD == sock) {
1183 logmsg("Error creating socket: (%d) %s",
1184 error, strerror(error));
1185 write_stdout("FAIL\n", 5);
1186 goto sockfilt_cleanup;
1190 /* Active mode, we should connect to the given port number */
1195 memset(&me.sa4, 0, sizeof(me.sa4));
1196 me.sa4.sin_family = AF_INET;
1197 me.sa4.sin_port = htons(connectport);
1198 me.sa4.sin_addr.s_addr = INADDR_ANY;
1201 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1203 rc = connect(sock, &me.sa, sizeof(me.sa4));
1207 memset(&me.sa6, 0, sizeof(me.sa6));
1208 me.sa6.sin6_family = AF_INET6;
1209 me.sa6.sin6_port = htons(connectport);
1212 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1214 rc = connect(sock, &me.sa, sizeof(me.sa6));
1216 #endif /* ENABLE_IPV6 */
1219 logmsg("Error connecting to port %hu: (%d) %s",
1220 connectport, error, strerror(error));
1221 write_stdout("FAIL\n", 5);
1222 goto sockfilt_cleanup;
1224 logmsg("====> Client connect");
1225 msgsock = sock; /* use this as stream */
1228 /* passive daemon style */
1229 sock = sockdaemon(sock, &port);
1230 if(CURL_SOCKET_BAD == sock) {
1231 write_stdout("FAIL\n", 5);
1232 goto sockfilt_cleanup;
1234 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1237 logmsg("Running %s version", ipv_inuse);
1240 logmsg("Connected to port %hu", connectport);
1242 logmsg("Bound without listening on port %hu", port);
1244 logmsg("Listening on port %hu", port);
1246 wrotepidfile = write_pidfile(pidname);
1248 write_stdout("FAIL\n", 5);
1249 goto sockfilt_cleanup;
1253 juggle_again = juggle(&msgsock, sock, &mode);
1254 } while(juggle_again);
1258 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1261 if(sock != CURL_SOCKET_BAD)
1267 restore_signal_handlers();
1269 if(got_exit_signal) {
1270 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1272 * To properly set the return status of the process we
1273 * must raise the same signal SIGINT or SIGTERM that we
1274 * caught and let the old handler take care of it.
1279 logmsg("============> sockfilt quits");