1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2008, 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.
22 ***************************************************************************/
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)
49 #include "setup.h" /* portability help from the lib directory */
59 #include <sys/types.h>
64 #ifdef HAVE_SYS_SOCKET_H
65 #include <sys/socket.h>
67 #ifdef HAVE_NETINET_IN_H
68 #include <netinet/in.h>
70 #ifdef _XOPEN_SOURCE_EXTENDED
71 /* This define is "almost" required to build on HPUX 11 */
72 #include <arpa/inet.h>
78 #define ENABLE_CURLX_PRINTF
79 /* make the curlx header define all printf() functions to use the curlx_*
81 #include "curlx.h" /* from the private lib dir */
83 #include "inet_pton.h"
86 /* include memdebug.h last */
89 #define DEFAULT_PORT 8999
91 #ifndef DEFAULT_LOGFILE
92 #define DEFAULT_LOGFILE "log/sockfilt.log"
96 static volatile int sigpipe; /* Why? It's not used */
99 const char *serverlogfile = (char *)DEFAULT_LOGFILE;
101 static void lograw(unsigned char *buffer, ssize_t len)
105 unsigned char *ptr = buffer;
109 for(i=0; i<len; i++) {
112 sprintf(optr, "\\n");
117 sprintf(optr, "\\r");
122 sprintf(optr, "%c", (ISGRAPH(ptr[i]) || ptr[i]==0x20) ?ptr[i]:'.');
129 logmsg("'%s'", data);
135 logmsg("'%s'", data);
139 static void sigpipe_handler(int sig)
141 (void)sig; /* prevent warning */
147 unsigned short port = DEFAULT_PORT;
148 unsigned short connectport = 0; /* if non-zero, we activate this mode */
151 PASSIVE_LISTEN, /* as a server waiting for connections */
152 PASSIVE_CONNECT, /* as a server, connected to a client */
153 ACTIVE, /* as a client, connected to a server */
154 ACTIVE_DISCONNECT /* as a client, disconnected from server */
158 sockfdp is a pointer to an established stream or CURL_SOCKET_BAD
160 if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
163 static bool juggle(curl_socket_t *sockfdp,
164 curl_socket_t listenfd,
167 struct timeval timeout;
171 curl_socket_t sockfd;
175 ssize_t nread_socket;
176 ssize_t bytes_written;
179 /* 'buffer' is this excessively large only to be able to support things like
180 test 1003 which tests exceedingly large server response lines */
181 unsigned char buffer[17010];
185 /* As a last resort, quit if sockfilt process becomes orphan. Just in case
186 parent ftpserver process has died without killing its sockfilt children */
191 timeout.tv_sec = 120;
198 FD_SET(fileno(stdin), &fds_read);
206 /* there's always a socket to wait for */
207 FD_SET(sockfd, &fds_read);
211 case PASSIVE_CONNECT:
214 if(CURL_SOCKET_BAD == sockfd) {
215 /* eeek, we are supposedly connected and then this cannot be -1 ! */
216 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
217 maxfd = 0; /* stdin */
220 /* there's always a socket to wait for */
221 FD_SET(sockfd, &fds_read);
229 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
230 if(CURL_SOCKET_BAD != sockfd) {
231 FD_SET(sockfd, &fds_read);
235 logmsg("No socket to read on");
240 case ACTIVE_DISCONNECT:
242 logmsg("disconnected, no socket to read on");
244 sockfd = CURL_SOCKET_BAD;
247 } /* switch(*mode) */
250 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
251 } while((rc == -1) && (SOCKERRNO == EINTR));
257 case 0: /* timeout! */
262 if(FD_ISSET(fileno(stdin), &fds_read)) {
263 /* read from stdin, commands/data to be dealt with and possibly passed on
268 4 letter command + LF [mandatory]
270 4-digit hexadecimal data length + LF [if the command takes data]
271 data [the data being as long as set above]
275 DATA - plain pass-thru data
277 nread_stdin = read(fileno(stdin), buffer, 5);
278 if(5 == nread_stdin) {
280 logmsg("Received %c%c%c%c (on stdin)",
281 buffer[0], buffer[1], buffer[2], buffer[3] );
283 if(!memcmp("PING", buffer, 4)) {
284 /* send reply on stdout, just proving we are alive */
285 write(fileno(stdout), "PONG\n", 5);
288 else if(!memcmp("PORT", buffer, 4)) {
289 /* Question asking us what PORT number we are listening to.
290 Replies to PORT with "IPv[num]/[port]" */
291 sprintf((char *)buffer, "IPv%d/%d\n", use_ipv6?6:4, (int)port);
292 buffer_len = (ssize_t)strlen((char *)buffer);
293 snprintf(data, sizeof(data), "PORT\n%04x\n", buffer_len);
294 write(fileno(stdout), data, 10);
295 write(fileno(stdout), buffer, buffer_len);
297 else if(!memcmp("QUIT", buffer, 4)) {
302 else if(!memcmp("DATA", buffer, 4)) {
303 /* data IN => data OUT */
305 if(5 != read(fileno(stdin), buffer, 5))
309 buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
310 if (buffer_len > (ssize_t)sizeof(buffer)) {
311 logmsg("ERROR: Buffer size (%ld bytes) too small for data size "
312 "(%ld bytes)", (long)sizeof(buffer), (long)buffer_len);
315 logmsg("> %d bytes data, server => client", buffer_len);
318 * To properly support huge data chunks, we need to repeat the call
319 * to read() until we're done or it fails.
323 /* get data in the buffer at the correct position */
324 rc = read(fileno(stdin), &buffer[nread_stdin],
325 buffer_len - nread_stdin);
326 logmsg("read %d bytes", rc);
330 } while (nread_stdin < buffer_len);
332 lograw(buffer, buffer_len);
334 if(*mode == PASSIVE_LISTEN) {
335 logmsg("*** We are disconnected!");
336 write(fileno(stdout), "DISC\n", 5);
339 /* send away on the socket */
340 bytes_written = swrite(sockfd, buffer, buffer_len);
341 if(bytes_written != buffer_len) {
342 logmsg("Not all data was sent. Bytes to send: %d sent: %d",
343 buffer_len, bytes_written);
347 else if(!memcmp("DISC", buffer, 4)) {
349 write(fileno(stdout), "DISC\n", 5);
350 if(sockfd != CURL_SOCKET_BAD) {
351 logmsg("====> Client forcibly disconnected");
353 *sockfdp = CURL_SOCKET_BAD;
354 if(*mode == PASSIVE_CONNECT)
355 *mode = PASSIVE_LISTEN;
357 *mode = ACTIVE_DISCONNECT;
360 logmsg("attempt to close already dead connection");
364 else if(-1 == nread_stdin) {
365 logmsg("read %d from stdin, exiting", nread_stdin);
371 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
373 if(*mode == PASSIVE_LISTEN) {
374 /* there's no stream set up yet, this is an indication that there's a
375 client connecting. */
376 sockfd = accept(sockfd, NULL, NULL);
377 if(CURL_SOCKET_BAD == sockfd)
378 logmsg("accept() failed");
380 logmsg("====> Client connect");
381 write(fileno(stdout), "CNCT\n", 5);
382 *sockfdp = sockfd; /* store the new socket */
383 *mode = PASSIVE_CONNECT; /* we have connected */
388 /* read from socket, pass on data to stdout */
389 nread_socket = sread(sockfd, buffer, sizeof(buffer));
391 if(nread_socket <= 0) {
392 logmsg("====> Client disconnect");
393 write(fileno(stdout), "DISC\n", 5);
395 *sockfdp = CURL_SOCKET_BAD;
396 if(*mode == PASSIVE_CONNECT)
397 *mode = PASSIVE_LISTEN;
399 *mode = ACTIVE_DISCONNECT;
403 snprintf(data, sizeof(data), "DATA\n%04x\n", nread_socket);
404 write(fileno(stdout), data, 10);
405 write(fileno(stdout), buffer, nread_socket);
407 logmsg("< %d bytes data, client => server", nread_socket);
408 lograw(buffer, nread_socket);
414 static curl_socket_t sockdaemon(curl_socket_t sock,
415 unsigned short *listenport)
417 /* passive daemon style */
418 struct sockaddr_in me;
420 struct sockaddr_in6 me6;
421 #endif /* ENABLE_IPV6 */
432 rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
433 (void *)&flag, sizeof(flag));
439 /* should not happen */
441 logmsg("wait_ms() failed: (%d) %s", error, strerror(error));
443 return CURL_SOCKET_BAD;
446 delay *= 2; /* double the sleep for next attempt */
449 } while(rc && maxretr--);
452 logmsg("setsockopt(SO_REUSEADDR) failed %d times in %d ms. Error: (%d) %s",
453 attempt, totdelay, error, strerror(error));
454 logmsg("Continuing anyway...");
460 memset(&me, 0, sizeof(me));
461 me.sin_family = AF_INET;
462 me.sin_addr.s_addr = INADDR_ANY;
463 me.sin_port = htons(*listenport);
464 rc = bind(sock, (struct sockaddr *) &me, sizeof(me));
468 memset(&me6, 0, sizeof(me6));
469 me6.sin6_family = AF_INET6;
470 me6.sin6_addr = in6addr_any;
471 me6.sin6_port = htons(*listenport);
472 rc = bind(sock, (struct sockaddr *) &me6, sizeof(me6));
474 #endif /* ENABLE_IPV6 */
477 logmsg("Error binding socket: (%d) %s", error, strerror(error));
479 return CURL_SOCKET_BAD;
483 /* The system picked a port number, now figure out which port we actually
485 /* we succeeded to bind */
486 struct sockaddr_in add;
487 socklen_t socksize = sizeof(add);
489 if(getsockname(sock, (struct sockaddr *) &add,
492 logmsg("getsockname() failed with error: (%d) %s",
493 error, strerror(error));
495 return CURL_SOCKET_BAD;
497 *listenport = ntohs(add.sin_port);
500 /* start accepting connections */
501 rc = listen(sock, 5);
504 logmsg("listen() failed with error: (%d) %s",
505 error, strerror(error));
507 return CURL_SOCKET_BAD;
514 int main(int argc, char *argv[])
516 struct sockaddr_in me;
518 struct sockaddr_in6 me6;
519 #endif /* ENABLE_IPV6 */
521 curl_socket_t msgsock;
523 char *pidname= (char *)".sockfilt.pid";
527 enum sockmode mode = PASSIVE_LISTEN; /* default */
528 const char *addr = NULL;
531 if(!strcmp("--version", argv[arg])) {
532 printf("sockfilt IPv4%s\n",
541 else if(!strcmp("--pidfile", argv[arg])) {
544 pidname = argv[arg++];
546 else if(!strcmp("--logfile", argv[arg])) {
549 serverlogfile = argv[arg++];
551 else if(!strcmp("--ipv6", argv[arg])) {
557 else if(!strcmp("--ipv4", argv[arg])) {
558 /* for completeness, we support this option as well */
562 else if(!strcmp("--port", argv[arg])) {
565 port = (unsigned short)atoi(argv[arg]);
569 else if(!strcmp("--connect", argv[arg])) {
570 /* Asked to actively connect to the specified local port instead of
571 doing a passive server-style listening. */
574 connectport = (unsigned short)atoi(argv[arg]);
578 else if(!strcmp("--addr", argv[arg])) {
579 /* Set an IP address to use with --connect; otherwise use localhost */
587 puts("Usage: sockfilt [option]\n"
589 " --logfile [file]\n"
590 " --pidfile [file]\n"
594 " --connect [port]\n"
595 " --addr [address]");
602 atexit(win32_cleanup);
607 signal(SIGPIPE, sigpipe_handler);
609 #ifdef HAVE_SIGINTERRUPT
610 siginterrupt(SIGPIPE, 1);
618 sock = socket(AF_INET, SOCK_STREAM, 0);
621 sock = socket(AF_INET6, SOCK_STREAM, 0);
624 if(CURL_SOCKET_BAD == sock) {
626 logmsg("Error creating socket: (%d) %s",
627 error, strerror(error));
632 /* Active mode, we should connect to the given port number */
637 memset(&me, 0, sizeof(me));
638 me.sin_family = AF_INET;
639 me.sin_port = htons(connectport);
640 me.sin_addr.s_addr = INADDR_ANY;
643 Curl_inet_pton(AF_INET, addr, &me.sin_addr);
645 rc = connect(sock, (struct sockaddr *) &me, sizeof(me));
649 memset(&me6, 0, sizeof(me6));
650 me6.sin6_family = AF_INET6;
651 me6.sin6_port = htons(connectport);
654 Curl_inet_pton(AF_INET6, addr, &me6.sin6_addr);
656 rc = connect(sock, (struct sockaddr *) &me6, sizeof(me6));
658 #endif /* ENABLE_IPV6 */
661 logmsg("Error connecting to port %d: (%d) %s",
662 port, error, strerror(error));
666 logmsg("====> Client connect");
667 msgsock = sock; /* use this as stream */
670 /* passive daemon style */
671 sock = sockdaemon(sock, &port);
672 if(CURL_SOCKET_BAD == sock)
674 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
677 logmsg("Running IPv%d version",
681 logmsg("Connected to port %d", connectport);
683 logmsg("Listening on port %d", port);
685 pidfile = fopen(pidname, "w");
687 long pid = (long)getpid();
688 fprintf(pidfile, "%ld\n", pid);
690 logmsg("Wrote pid %ld to %s", pid, pidname);
694 logmsg("fopen() failed with error: %d %s", error, strerror(error));
695 logmsg("Error opening file: %s", pidname);
696 logmsg("Couldn't write pid file");
701 while(juggle(&msgsock, sock, &mode));