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("unrecoverable read() failure: (%d) %s",
299 error, strerror(error));
304 logmsg("got 0 reading from stdin");
310 } while((size_t)nread < nbytes);
313 logmsg("read %zd bytes", nread);
319 * fullwrite is a wrapper around the write() function. This will repeat the
320 * call to write() until it actually has written the complete number of bytes
321 * indicated in nbytes or it fails with a condition that cannot be handled
322 * with a simple retry of the write call.
325 static ssize_t fullwrite(int filedes, const void *buffer, size_t nbytes)
332 wc = write(filedes, (unsigned char *)buffer + nwrite, nbytes - nwrite);
334 if(got_exit_signal) {
335 logmsg("signalled to die");
341 if((error == EINTR) || (error == EAGAIN))
343 logmsg("unrecoverable write() failure: (%d) %s",
344 error, strerror(error));
349 logmsg("put 0 writing to stdout");
355 } while((size_t)nwrite < nbytes);
358 logmsg("wrote %zd bytes", nwrite);
364 * read_stdin tries to read from stdin nbytes into the given buffer. This is a
365 * blocking function that will only return TRUE when nbytes have actually been
366 * read or FALSE when an unrecoverable error has been detected. Failure of this
367 * function is an indication that the sockfilt process should terminate.
370 static bool read_stdin(void *buffer, size_t nbytes)
372 ssize_t nread = fullread(fileno(stdin), buffer, nbytes);
373 if(nread != (ssize_t)nbytes) {
374 logmsg("exiting...");
381 * write_stdout tries to write to stdio nbytes from the given buffer. This is a
382 * blocking function that will only return TRUE when nbytes have actually been
383 * written or FALSE when an unrecoverable error has been detected. Failure of
384 * this function is an indication that the sockfilt process should terminate.
387 static bool write_stdout(const void *buffer, size_t nbytes)
389 ssize_t nwrite = fullwrite(fileno(stdout), buffer, nbytes);
390 if(nwrite != (ssize_t)nbytes) {
391 logmsg("exiting...");
397 static void lograw(unsigned char *buffer, ssize_t len)
401 unsigned char *ptr = buffer;
405 for(i=0; i<len; i++) {
408 sprintf(optr, "\\n");
413 sprintf(optr, "\\r");
418 sprintf(optr, "%c", (ISGRAPH(ptr[i]) || ptr[i]==0x20) ?ptr[i]:'.');
425 logmsg("'%s'", data);
431 logmsg("'%s'", data);
436 * WinSock select() does not support standard file descriptors,
437 * it can only check SOCKETs. The following function is an attempt
438 * to re-create a select() function with support for other handle types.
440 * select() function with support for WINSOCK2 sockets and all
441 * other handle types supported by WaitForMultipleObjectsEx().
443 * TODO: Differentiate between read/write/except for non-SOCKET handles.
445 * http://msdn.microsoft.com/en-us/library/windows/desktop/ms687028.aspx
446 * http://msdn.microsoft.com/en-us/library/windows/desktop/ms741572.aspx
448 static int select_ws(int nfds, fd_set *readfds, fd_set *writefds,
449 fd_set *exceptfds, struct timeval *timeout)
452 DWORD milliseconds, wait, idx, avail, events, inputs;
453 WSAEVENT wsaevent, *wsaevents;
454 WSANETWORKEVENTS wsanetevents;
455 INPUT_RECORD *inputrecords;
456 HANDLE handle, *handles;
457 curl_socket_t sock, *fdarr, *wsasocks;
459 DWORD nfd = 0, wsa = 0;
462 /* check if the input value is valid */
468 /* check if we got descriptors, sleep in case we got none */
470 Sleep((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
474 /* allocate internal array for the original input handles */
475 fdarr = malloc(nfds * sizeof(curl_socket_t));
481 /* allocate internal array for the internal event handles */
482 handles = malloc(nfds * sizeof(HANDLE));
483 if(handles == NULL) {
488 /* allocate internal array for the internal socket handles */
489 wsasocks = malloc(nfds * sizeof(curl_socket_t));
490 if(wsasocks == NULL) {
495 /* allocate internal array for the internal WINSOCK2 events */
496 wsaevents = malloc(nfds * sizeof(WSAEVENT));
497 if(wsaevents == NULL) {
502 /* loop over the handles in the input descriptor sets */
503 for(fds = 0; fds < nfds; fds++) {
507 if(FD_ISSET(fds, readfds))
508 networkevents |= FD_READ|FD_ACCEPT|FD_CLOSE;
510 if(FD_ISSET(fds, writefds))
511 networkevents |= FD_WRITE|FD_CONNECT;
513 if(FD_ISSET(fds, exceptfds))
514 networkevents |= FD_OOB;
516 /* only wait for events for which we actually care */
518 fdarr[nfd] = curlx_sitosk(fds);
519 if(fds == fileno(stdin)) {
520 handles[nfd] = GetStdHandle(STD_INPUT_HANDLE);
522 else if(fds == fileno(stdout)) {
523 handles[nfd] = GetStdHandle(STD_OUTPUT_HANDLE);
525 else if(fds == fileno(stderr)) {
526 handles[nfd] = GetStdHandle(STD_ERROR_HANDLE);
529 wsaevent = WSACreateEvent();
530 if(wsaevent != WSA_INVALID_EVENT) {
531 error = WSAEventSelect(fds, wsaevent, networkevents);
532 if(error != SOCKET_ERROR) {
533 handles[nfd] = wsaevent;
534 wsasocks[wsa] = curlx_sitosk(fds);
535 wsaevents[wsa] = wsaevent;
539 handles[nfd] = (HANDLE) curlx_sitosk(fds);
540 WSACloseEvent(wsaevent);
548 /* convert struct timeval to milliseconds */
550 milliseconds = ((timeout->tv_sec * 1000) + (timeout->tv_usec / 1000));
553 milliseconds = INFINITE;
556 /* wait for one of the internal handles to trigger */
557 wait = WaitForMultipleObjectsEx(nfd, handles, FALSE, milliseconds, FALSE);
559 /* loop over the internal handles returned in the descriptors */
560 for(idx = 0; idx < nfd; idx++) {
561 handle = handles[idx];
563 fds = curlx_sktosi(sock);
565 /* check if the current internal handle was triggered */
566 if(wait != WAIT_FAILED && (wait - WAIT_OBJECT_0) >= idx &&
567 WaitForSingleObjectEx(handle, 0, FALSE) == WAIT_OBJECT_0) {
568 /* try to handle the event with STD* handle functions */
569 if(fds == fileno(stdin)) {
570 /* check if there is no data in the input buffer */
572 /* check if we are getting data from a PIPE */
573 if(!GetConsoleMode(handle, &avail)) {
574 /* check if there is no data from PIPE input */
575 if(!PeekNamedPipe(handle, NULL, 0, NULL, &avail, NULL))
578 FD_CLR(sock, readfds);
579 } /* check if there is no data from keyboard input */
580 else if (!_kbhit()) {
581 /* check if there are INPUT_RECORDs in the input buffer */
582 if(GetNumberOfConsoleInputEvents(handle, &events)) {
584 /* remove INPUT_RECORDs from the input buffer */
585 inputrecords = (INPUT_RECORD*)malloc(events *
586 sizeof(INPUT_RECORD));
588 if(!ReadConsoleInput(handle, inputrecords,
594 /* check if we got all inputs, otherwise clear buffer */
596 FlushConsoleInputBuffer(handle);
600 /* remove from descriptor set since there is no real data */
601 FD_CLR(sock, readfds);
605 /* stdin is never ready for write or exceptional */
606 FD_CLR(sock, writefds);
607 FD_CLR(sock, exceptfds);
609 else if(fds == fileno(stdout) || fds == fileno(stderr)) {
610 /* stdout and stderr are never ready for read or exceptional */
611 FD_CLR(sock, readfds);
612 FD_CLR(sock, exceptfds);
615 /* try to handle the event with the WINSOCK2 functions */
616 error = WSAEnumNetworkEvents(fds, NULL, &wsanetevents);
617 if(error != SOCKET_ERROR) {
618 /* remove from descriptor set if not ready for read/accept/close */
619 if(!(wsanetevents.lNetworkEvents & (FD_READ|FD_ACCEPT|FD_CLOSE)))
620 FD_CLR(sock, readfds);
622 /* remove from descriptor set if not ready for write/connect */
623 if(!(wsanetevents.lNetworkEvents & (FD_WRITE|FD_CONNECT)))
624 FD_CLR(sock, writefds);
626 /* remove from descriptor set if not exceptional */
627 if(!(wsanetevents.lNetworkEvents & FD_OOB))
628 FD_CLR(sock, exceptfds);
632 /* check if the event has not been filtered using specific tests */
633 if(FD_ISSET(sock, readfds) || FD_ISSET(sock, writefds) ||
634 FD_ISSET(sock, exceptfds)) {
639 /* remove from all descriptor sets since this handle did not trigger */
640 FD_CLR(sock, readfds);
641 FD_CLR(sock, writefds);
642 FD_CLR(sock, exceptfds);
646 for(idx = 0; idx < wsa; idx++) {
647 WSAEventSelect(wsasocks[idx], NULL, 0);
648 WSACloseEvent(wsaevents[idx]);
658 #define select(a,b,c,d,e) select_ws(a,b,c,d,e)
659 #endif /* USE_WINSOCK */
662 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
664 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
667 static bool juggle(curl_socket_t *sockfdp,
668 curl_socket_t listenfd,
671 struct timeval timeout;
675 curl_socket_t sockfd = CURL_SOCKET_BAD;
678 ssize_t nread_socket;
679 ssize_t bytes_written;
683 /* 'buffer' is this excessively large only to be able to support things like
684 test 1003 which tests exceedingly large server response lines */
685 unsigned char buffer[17010];
688 if(got_exit_signal) {
689 logmsg("signalled to die, exiting...");
694 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
695 parent ftpserver process has died without killing its sockfilt children */
697 logmsg("process becomes orphan, exiting");
702 timeout.tv_sec = 120;
709 FD_SET((curl_socket_t)fileno(stdin), &fds_read);
717 /* there's always a socket to wait for */
718 FD_SET(sockfd, &fds_read);
722 case PASSIVE_CONNECT:
725 if(CURL_SOCKET_BAD == sockfd) {
726 /* eeek, we are supposedly connected and then this cannot be -1 ! */
727 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
728 maxfd = 0; /* stdin */
731 /* there's always a socket to wait for */
732 FD_SET(sockfd, &fds_read);
740 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
741 if(CURL_SOCKET_BAD != sockfd) {
742 FD_SET(sockfd, &fds_read);
746 logmsg("No socket to read on");
751 case ACTIVE_DISCONNECT:
753 logmsg("disconnected, no socket to read on");
755 sockfd = CURL_SOCKET_BAD;
758 } /* switch(*mode) */
763 /* select() blocking behavior call on blocking descriptors please */
765 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
767 if(got_exit_signal) {
768 logmsg("signalled to die, exiting...");
772 } while((rc == -1) && ((error = errno) == EINTR));
775 logmsg("select() failed with error: (%d) %s",
776 error, strerror(error));
785 if(FD_ISSET(fileno(stdin), &fds_read)) {
786 /* read from stdin, commands/data to be dealt with and possibly passed on
791 4 letter command + LF [mandatory]
793 4-digit hexadecimal data length + LF [if the command takes data]
794 data [the data being as long as set above]
798 DATA - plain pass-thru data
801 if(!read_stdin(buffer, 5))
804 logmsg("Received %c%c%c%c (on stdin)",
805 buffer[0], buffer[1], buffer[2], buffer[3] );
807 if(!memcmp("PING", buffer, 4)) {
808 /* send reply on stdout, just proving we are alive */
809 if(!write_stdout("PONG\n", 5))
813 else if(!memcmp("PORT", buffer, 4)) {
814 /* Question asking us what PORT number we are listening to.
815 Replies to PORT with "IPv[num]/[port]" */
816 sprintf((char *)buffer, "%s/%hu\n", ipv_inuse, port);
817 buffer_len = (ssize_t)strlen((char *)buffer);
818 snprintf(data, sizeof(data), "PORT\n%04zx\n", buffer_len);
819 if(!write_stdout(data, 10))
821 if(!write_stdout(buffer, buffer_len))
824 else if(!memcmp("QUIT", buffer, 4)) {
829 else if(!memcmp("DATA", buffer, 4)) {
830 /* data IN => data OUT */
832 if(!read_stdin(buffer, 5))
837 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
838 if (buffer_len > (ssize_t)sizeof(buffer)) {
839 logmsg("ERROR: Buffer size (%zu bytes) too small for data size "
840 "(%zd bytes)", sizeof(buffer), buffer_len);
843 logmsg("> %zd bytes data, server => client", buffer_len);
845 if(!read_stdin(buffer, buffer_len))
848 lograw(buffer, buffer_len);
850 if(*mode == PASSIVE_LISTEN) {
851 logmsg("*** We are disconnected!");
852 if(!write_stdout("DISC\n", 5))
856 /* send away on the socket */
857 bytes_written = swrite(sockfd, buffer, buffer_len);
858 if(bytes_written != buffer_len) {
859 logmsg("Not all data was sent. Bytes to send: %zd sent: %zd",
860 buffer_len, bytes_written);
864 else if(!memcmp("DISC", buffer, 4)) {
866 if(!write_stdout("DISC\n", 5))
868 if(sockfd != CURL_SOCKET_BAD) {
869 logmsg("====> Client forcibly disconnected");
871 *sockfdp = CURL_SOCKET_BAD;
872 if(*mode == PASSIVE_CONNECT)
873 *mode = PASSIVE_LISTEN;
875 *mode = ACTIVE_DISCONNECT;
878 logmsg("attempt to close already dead connection");
884 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
886 curl_socket_t newfd = CURL_SOCKET_BAD; /* newly accepted socket */
888 if(*mode == PASSIVE_LISTEN) {
889 /* there's no stream set up yet, this is an indication that there's a
890 client connecting. */
891 newfd = accept(sockfd, NULL, NULL);
892 if(CURL_SOCKET_BAD == newfd) {
894 logmsg("accept(%d, NULL, NULL) failed with error: (%d) %s",
895 sockfd, error, strerror(error));
898 logmsg("====> Client connect");
899 if(!write_stdout("CNCT\n", 5))
901 *sockfdp = newfd; /* store the new socket */
902 *mode = PASSIVE_CONNECT; /* we have connected */
907 /* read from socket, pass on data to stdout */
908 nread_socket = sread(sockfd, buffer, sizeof(buffer));
910 if(nread_socket <= 0) {
911 logmsg("====> Client disconnect");
912 if(!write_stdout("DISC\n", 5))
915 *sockfdp = CURL_SOCKET_BAD;
916 if(*mode == PASSIVE_CONNECT)
917 *mode = PASSIVE_LISTEN;
919 *mode = ACTIVE_DISCONNECT;
923 snprintf(data, sizeof(data), "DATA\n%04zx\n", nread_socket);
924 if(!write_stdout(data, 10))
926 if(!write_stdout(buffer, nread_socket))
929 logmsg("< %zd bytes data, client => server", nread_socket);
930 lograw(buffer, nread_socket);
936 static curl_socket_t sockdaemon(curl_socket_t sock,
937 unsigned short *listenport)
939 /* passive daemon style */
940 srvr_sockaddr_union_t listener;
952 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
953 (void *)&flag, sizeof(flag));
956 logmsg("setsockopt(SO_REUSEADDR) failed with error: (%d) %s",
957 error, strerror(error));
961 /* should not happen */
963 logmsg("wait_ms() failed with error: (%d) %s",
964 error, strerror(error));
966 return CURL_SOCKET_BAD;
968 if(got_exit_signal) {
969 logmsg("signalled to die, exiting...");
971 return CURL_SOCKET_BAD;
974 delay *= 2; /* double the sleep for next attempt */
977 } while(rc && maxretr--);
980 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
981 attempt, totdelay, error, strerror(error));
982 logmsg("Continuing anyway...");
985 /* When the specified listener port is zero, it is actually a
986 request to let the system choose a non-zero available port. */
991 memset(&listener.sa4, 0, sizeof(listener.sa4));
992 listener.sa4.sin_family = AF_INET;
993 listener.sa4.sin_addr.s_addr = INADDR_ANY;
994 listener.sa4.sin_port = htons(*listenport);
995 rc = bind(sock, &listener.sa, sizeof(listener.sa4));
999 memset(&listener.sa6, 0, sizeof(listener.sa6));
1000 listener.sa6.sin6_family = AF_INET6;
1001 listener.sa6.sin6_addr = in6addr_any;
1002 listener.sa6.sin6_port = htons(*listenport);
1003 rc = bind(sock, &listener.sa, sizeof(listener.sa6));
1005 #endif /* ENABLE_IPV6 */
1008 logmsg("Error binding socket on port %hu: (%d) %s",
1009 *listenport, error, strerror(error));
1011 return CURL_SOCKET_BAD;
1015 /* The system was supposed to choose a port number, figure out which
1016 port we actually got and update the listener port value with it. */
1017 curl_socklen_t la_size;
1018 srvr_sockaddr_union_t localaddr;
1022 la_size = sizeof(localaddr.sa4);
1025 la_size = sizeof(localaddr.sa6);
1027 memset(&localaddr.sa, 0, (size_t)la_size);
1028 if(getsockname(sock, &localaddr.sa, &la_size) < 0) {
1030 logmsg("getsockname() failed with error: (%d) %s",
1031 error, strerror(error));
1033 return CURL_SOCKET_BAD;
1035 switch (localaddr.sa.sa_family) {
1037 *listenport = ntohs(localaddr.sa4.sin_port);
1041 *listenport = ntohs(localaddr.sa6.sin6_port);
1048 /* Real failure, listener port shall not be zero beyond this point. */
1049 logmsg("Apparently getsockname() succeeded, with listener port zero.");
1050 logmsg("A valid reason for this failure is a binary built without");
1051 logmsg("proper network library linkage. This might not be the only");
1052 logmsg("reason, but double check it before anything else.");
1054 return CURL_SOCKET_BAD;
1058 /* bindonly option forces no listening */
1060 logmsg("instructed to bind port without listening");
1064 /* start accepting connections */
1065 rc = listen(sock, 5);
1068 logmsg("listen(%d, 5) failed with error: (%d) %s",
1069 sock, error, strerror(error));
1071 return CURL_SOCKET_BAD;
1078 int main(int argc, char *argv[])
1080 srvr_sockaddr_union_t me;
1081 curl_socket_t sock = CURL_SOCKET_BAD;
1082 curl_socket_t msgsock = CURL_SOCKET_BAD;
1083 int wrotepidfile = 0;
1084 char *pidname= (char *)".sockfilt.pid";
1089 enum sockmode mode = PASSIVE_LISTEN; /* default */
1090 const char *addr = NULL;
1093 if(!strcmp("--version", argv[arg])) {
1094 printf("sockfilt IPv4%s\n",
1103 else if(!strcmp("--verbose", argv[arg])) {
1107 else if(!strcmp("--pidfile", argv[arg])) {
1110 pidname = argv[arg++];
1112 else if(!strcmp("--logfile", argv[arg])) {
1115 serverlogfile = argv[arg++];
1117 else if(!strcmp("--ipv6", argv[arg])) {
1124 else if(!strcmp("--ipv4", argv[arg])) {
1125 /* for completeness, we support this option as well */
1132 else if(!strcmp("--bindonly", argv[arg])) {
1136 else if(!strcmp("--port", argv[arg])) {
1140 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1141 if((endptr != argv[arg] + strlen(argv[arg])) ||
1142 ((ulnum != 0UL) && ((ulnum < 1025UL) || (ulnum > 65535UL)))) {
1143 fprintf(stderr, "sockfilt: invalid --port argument (%s)\n",
1147 port = curlx_ultous(ulnum);
1151 else if(!strcmp("--connect", argv[arg])) {
1152 /* Asked to actively connect to the specified local port instead of
1153 doing a passive server-style listening. */
1157 unsigned long ulnum = strtoul(argv[arg], &endptr, 10);
1158 if((endptr != argv[arg] + strlen(argv[arg])) ||
1159 (ulnum < 1025UL) || (ulnum > 65535UL)) {
1160 fprintf(stderr, "sockfilt: invalid --connect argument (%s)\n",
1164 connectport = curlx_ultous(ulnum);
1168 else if(!strcmp("--addr", argv[arg])) {
1169 /* Set an IP address to use with --connect; otherwise use localhost */
1177 puts("Usage: sockfilt [option]\n"
1180 " --logfile [file]\n"
1181 " --pidfile [file]\n"
1186 " --connect [port]\n"
1187 " --addr [address]");
1194 atexit(win32_cleanup);
1196 setmode(fileno(stdin), O_BINARY);
1197 setmode(fileno(stdout), O_BINARY);
1198 setmode(fileno(stderr), O_BINARY);
1201 install_signal_handlers();
1206 sock = socket(AF_INET, SOCK_STREAM, 0);
1209 sock = socket(AF_INET6, SOCK_STREAM, 0);
1212 if(CURL_SOCKET_BAD == sock) {
1214 logmsg("Error creating socket: (%d) %s",
1215 error, strerror(error));
1216 write_stdout("FAIL\n", 5);
1217 goto sockfilt_cleanup;
1221 /* Active mode, we should connect to the given port number */
1226 memset(&me.sa4, 0, sizeof(me.sa4));
1227 me.sa4.sin_family = AF_INET;
1228 me.sa4.sin_port = htons(connectport);
1229 me.sa4.sin_addr.s_addr = INADDR_ANY;
1232 Curl_inet_pton(AF_INET, addr, &me.sa4.sin_addr);
1234 rc = connect(sock, &me.sa, sizeof(me.sa4));
1238 memset(&me.sa6, 0, sizeof(me.sa6));
1239 me.sa6.sin6_family = AF_INET6;
1240 me.sa6.sin6_port = htons(connectport);
1243 Curl_inet_pton(AF_INET6, addr, &me.sa6.sin6_addr);
1245 rc = connect(sock, &me.sa, sizeof(me.sa6));
1247 #endif /* ENABLE_IPV6 */
1250 logmsg("Error connecting to port %hu: (%d) %s",
1251 connectport, error, strerror(error));
1252 write_stdout("FAIL\n", 5);
1253 goto sockfilt_cleanup;
1255 logmsg("====> Client connect");
1256 msgsock = sock; /* use this as stream */
1259 /* passive daemon style */
1260 sock = sockdaemon(sock, &port);
1261 if(CURL_SOCKET_BAD == sock) {
1262 write_stdout("FAIL\n", 5);
1263 goto sockfilt_cleanup;
1265 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
1268 logmsg("Running %s version", ipv_inuse);
1271 logmsg("Connected to port %hu", connectport);
1273 logmsg("Bound without listening on port %hu", port);
1275 logmsg("Listening on port %hu", port);
1277 wrotepidfile = write_pidfile(pidname);
1279 write_stdout("FAIL\n", 5);
1280 goto sockfilt_cleanup;
1284 juggle_again = juggle(&msgsock, sock, &mode);
1285 } while(juggle_again);
1289 if((msgsock != sock) && (msgsock != CURL_SOCKET_BAD))
1292 if(sock != CURL_SOCKET_BAD)
1298 restore_signal_handlers();
1300 if(got_exit_signal) {
1301 logmsg("============> sockfilt exits with signal (%d)", exit_signal);
1303 * To properly set the return status of the process we
1304 * must raise the same signal SIGINT or SIGTERM that we
1305 * caught and let the old handler take care of it.
1310 logmsg("============> sockfilt quits");