1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2005, 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 int juggle(curl_socket_t *sockfdp,
164 curl_socket_t listenfd,
167 struct timeval timeout;
175 ssize_t bytes_written;
178 unsigned char buffer[256]; /* FIX: bigger buffer */
180 curl_socket_t sockfd;
182 timeout.tv_sec = 120;
189 FD_SET(fileno(stdin), &fds_read);
195 /* there's always a socket to wait for */
196 FD_SET(sockfd, &fds_read);
200 case PASSIVE_CONNECT:
203 /* eeek, we are supposedly connected and then this cannot be -1 ! */
204 logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
205 maxfd = 0; /* stdin */
208 /* there's always a socket to wait for */
209 FD_SET(sockfd, &fds_read);
217 /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
218 if(sockfd != CURL_SOCKET_BAD) {
219 FD_SET(sockfd, &fds_read);
223 logmsg("No socket to read on");
228 case ACTIVE_DISCONNECT:
229 logmsg("disconnected, no socket to read on");
231 sockfd = CURL_SOCKET_BAD;
236 rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
237 } while((rc == -1) && (ourerrno() == EINTR));
243 case 0: /* timeout! */
248 if(FD_ISSET(fileno(stdin), &fds_read)) {
249 /* read from stdin, commands/data to be dealt with and possibly passed on
254 4 letter command + LF [mandatory]
256 4-digit hexadecimal data length + LF [if the command takes data]
257 data [the data being as long as set above]
261 DATA - plain pass-thru data
263 nread = read(fileno(stdin), buffer, 5);
266 logmsg("Received %c%c%c%c (on stdin)",
267 buffer[0], buffer[1], buffer[2], buffer[3] );
269 if(!memcmp("PING", buffer, 4)) {
270 /* send reply on stdout, just proving we are alive */
271 write(fileno(stdout), "PONG\n", 5);
274 else if(!memcmp("PORT", buffer, 4)) {
275 /* question asking us what PORT number we are listening to.
276 Replies with PORT with "IPv[num]/[port]" */
277 sprintf((char *)buffer, "IPv%d/%d\n", use_ipv6?6:4, port);
278 port_strlen = (ssize_t)strlen((char *)buffer);
279 sprintf(data, "PORT\n%04x\n", port_strlen);
280 write(fileno(stdout), data, 10);
281 write(fileno(stdout), buffer, port_strlen);
283 else if(!memcmp("QUIT", buffer, 4)) {
288 else if(!memcmp("DATA", buffer, 4)) {
289 /* data IN => data OUT */
291 if(5 != read(fileno(stdin), buffer, 5))
295 len = (ssize_t)strtol((char *)buffer, NULL, 16);
296 if(len != read(fileno(stdin), buffer, len))
299 logmsg("> %d bytes data, server => client", len);
302 if(*mode == PASSIVE_LISTEN) {
303 logmsg("*** We are disconnected!");
304 write(fileno(stdout), "DISC\n", 5);
307 /* send away on the socket */
308 bytes_written = swrite(sockfd, buffer, len);
309 if(bytes_written != len) {
310 logmsg("Not all data was sent. Bytes to send: %d sent: %d",
315 else if(!memcmp("DISC", buffer, 4)) {
317 write(fileno(stdout), "DISC\n", 5);
318 if(sockfd != CURL_SOCKET_BAD) {
319 logmsg("====> Client forcibly disconnected");
321 *sockfdp = CURL_SOCKET_BAD;
322 if(*mode == PASSIVE_CONNECT)
323 *mode = PASSIVE_LISTEN;
325 *mode = ACTIVE_DISCONNECT;
328 logmsg("attempt to close already dead connection");
332 else if(nread == -1){
333 logmsg("read %d from stdin, exiting", nread);
338 if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {
340 if(*mode == PASSIVE_LISTEN) {
341 /* there's no stream set up yet, this is an indication that there's a
342 client connecting. */
343 sockfd = accept(sockfd, NULL, NULL);
345 logmsg("accept() failed\n");
347 logmsg("====> Client connect");
348 write(fileno(stdout), "CNCT\n", 5);
349 *sockfdp = sockfd; /* store the new socket */
350 *mode = PASSIVE_CONNECT; /* we have connected */
355 /* read from socket, pass on data to stdout */
356 bytes_read = sread(sockfd, buffer, sizeof(buffer));
358 if(bytes_read <= 0) {
359 logmsg("====> Client disconnect");
360 write(fileno(stdout), "DISC\n", 5);
362 *sockfdp = CURL_SOCKET_BAD;
363 if(*mode == PASSIVE_CONNECT)
364 *mode = PASSIVE_LISTEN;
366 *mode = ACTIVE_DISCONNECT;
370 sprintf(data, "DATA\n%04x\n", bytes_read);
371 write(fileno(stdout), data, 10);
372 write(fileno(stdout), buffer, bytes_read);
374 logmsg("< %d bytes data, client => server", bytes_read);
375 lograw(buffer, bytes_read);
381 static curl_socket_t sockdaemon(curl_socket_t sock,
382 unsigned short *port)
384 /* passive daemon style */
385 struct sockaddr_in me;
387 struct sockaddr_in6 me6;
388 #endif /* ENABLE_IPV6 */
393 (sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &flag,
395 perror("setsockopt(SO_REUSEADDR)");
401 me.sin_family = AF_INET;
402 me.sin_addr.s_addr = INADDR_ANY;
403 me.sin_port = htons(*port);
404 rc = bind(sock, (struct sockaddr *) &me, sizeof(me));
408 memset(&me6, 0, sizeof(struct sockaddr_in6));
409 me6.sin6_family = AF_INET6;
410 me6.sin6_addr = in6addr_any;
411 me6.sin6_port = htons(*port);
412 rc = bind(sock, (struct sockaddr *) &me6, sizeof(me6));
414 #endif /* ENABLE_IPV6 */
416 perror("binding stream socket");
417 logmsg("Error binding socket");
418 return CURL_SOCKET_BAD;
422 /* The system picked a port number, now figure out which port we actually
424 /* we succeeded to bind */
425 struct sockaddr_in add;
426 socklen_t socksize = sizeof(add);
428 if(getsockname(sock, (struct sockaddr *) &add,
430 fprintf(stderr, "getsockname() failed");
431 return CURL_SOCKET_BAD;
433 *port = ntohs(add.sin_port);
436 /* start accepting connections */
442 static curl_socket_t mksock(bool use_ipv6)
450 sock = socket(AF_INET, SOCK_STREAM, 0);
453 sock = socket(AF_INET6, SOCK_STREAM, 0);
457 perror("opening stream socket");
458 logmsg("Error opening socket");
459 return CURL_SOCKET_BAD;
466 int main(int argc, char *argv[])
468 struct sockaddr_in me;
470 struct sockaddr_in6 me6;
471 #endif /* ENABLE_IPV6 */
473 curl_socket_t msgsock;
475 char *pidname= (char *)".sockfilt.pid";
478 enum sockmode mode = PASSIVE_LISTEN; /* default */
481 if(!strcmp("--version", argv[arg])) {
482 printf("sockfilt IPv4%s\n",
491 else if(!strcmp("--pidfile", argv[arg])) {
494 pidname = argv[arg++];
496 else if(!strcmp("--logfile", argv[arg])) {
499 serverlogfile = argv[arg++];
501 else if(!strcmp("--ipv6", argv[arg])) {
507 else if(!strcmp("--ipv4", argv[arg])) {
508 /* for completeness, we support this option as well */
512 else if(!strcmp("--port", argv[arg])) {
515 port = (unsigned short)atoi(argv[arg]);
519 else if(!strcmp("--connect", argv[arg])) {
520 /* Asked to actively connect to the specified local port instead of
521 doing a passive server-style listening. */
524 connectport = (unsigned short)atoi(argv[arg]);
529 puts("Usage: sockfilt [option]\n"
531 " --logfile [file]\n"
532 " --pidfile [file]\n"
540 #if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
542 atexit(win32_cleanup);
547 signal(SIGPIPE, sigpipe_handler);
549 #ifdef HAVE_SIGINTERRUPT
550 siginterrupt(SIGPIPE, 1);
556 sock = mksock(use_ipv6);
559 /* Active mode, we should connect to the given port number */
564 memset(&me, 0, sizeof(me));
565 me.sin_family = AF_INET;
566 me.sin_port = htons(connectport);
567 me.sin_addr.s_addr = INADDR_ANY;
568 Curl_inet_pton(AF_INET, "127.0.0.1", &me.sin_addr);
570 rc = connect(sock, (struct sockaddr *) &me, sizeof(me));
574 memset(&me6, 0, sizeof(me6));
575 me6.sin6_family = AF_INET6;
576 me6.sin6_port = htons(connectport);
577 Curl_inet_pton(AF_INET6, "::1", &me6.sin6_addr);
579 rc = connect(sock, (struct sockaddr *) &me6, sizeof(me6));
581 #endif /* ENABLE_IPV6 */
583 perror("connecting stream socket");
584 logmsg("Error connecting to port %d", port);
587 logmsg("====> Client connect");
588 msgsock = sock; /* use this as stream */
591 /* passive daemon style */
592 sock = sockdaemon(sock, &port);
593 if(CURL_SOCKET_BAD == sock)
595 msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
598 logmsg("Running IPv%d version",
602 logmsg("Connected to port %d", connectport);
604 logmsg("Listening on port %d", port);
606 pidfile = fopen(pidname, "w");
608 int pid = (int)getpid();
609 fprintf(pidfile, "%d\n", pid);
611 logmsg("Wrote pid %d to %s", pid, pidname);
614 fprintf(stderr, "Couldn't write pid file\n");
616 while(juggle(&msgsock, sock, &mode));