aboutsummaryrefslogtreecommitdiff
path: root/tests/server/sockfilt.c
blob: 2cca0b37b95d02415eb88aaa4383265a22b85a9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/

/* Purpose
 *
 * 1. Accept a TCP connection on a custom port (ipv4 or ipv6), or connect
 *    to a given (localhost) port.
 *
 * 2. Get commands on STDIN. Pass data on to the TCP stream.
 *    Get data from TCP stream and pass on to STDOUT.
 *
 * This program is made to perform all the socket/stream/connection stuff for
 * the test suite's (perl) FTP server. Previously the perl code did all of
 * this by its own, but I decided to let this program do the socket layer
 * because of several things:
 *
 * o We want the perl code to work with rather old perl installations, thus
 *   we cannot use recent perl modules or features.
 *
 * o We want IPv6 support for systems that provide it, and doing optional IPv6
 *   support in perl seems if not impossible so at least awkward.
 *
 * o We want FTP-SSL support, which means that a connection that starts with
 *   plain sockets needs to be able to "go SSL" in the midst. This would also
 *   require some nasty perl stuff I'd rather avoid.
 *
 * (Source originally based on sws.c)
 */
#include "setup.h" /* portability help from the lib directory */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <signal.h>
#include <time.h>
#include <ctype.h>
#include <sys/time.h>
#include <sys/types.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef _XOPEN_SOURCE_EXTENDED
/* This define is "almost" required to build on HPUX 11 */
#include <arpa/inet.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif

#define ENABLE_CURLX_PRINTF
/* make the curlx header define all printf() functions to use the curlx_*
   versions instead */
#include "curlx.h" /* from the private lib dir */
#include "getpart.h"
#include "inet_pton.h"
#include "util.h"

/* include memdebug.h last */
#include "memdebug.h"

#define DEFAULT_PORT 8999

#ifndef DEFAULT_LOGFILE
#define DEFAULT_LOGFILE "log/sockfilt.log"
#endif

#ifdef SIGPIPE
static volatile int sigpipe;  /* Why? It's not used */
#endif

const char *serverlogfile = (char *)DEFAULT_LOGFILE;

static void lograw(unsigned char *buffer, ssize_t len)
{
  char data[120];
  ssize_t i;
  unsigned char *ptr = buffer;
  char *optr = data;
  ssize_t width=0;

  for(i=0; i<len; i++) {
    switch(ptr[i]) {
    case '\n':
      sprintf(optr, "\\n");
      width += 2;
      optr += 2;
      break;
    case '\r':
      sprintf(optr, "\\r");
      width += 2;
      optr += 2;
      break;
    default:
      sprintf(optr, "%c", (ISGRAPH(ptr[i]) || ptr[i]==0x20) ?ptr[i]:'.');
      width++;
      optr++;
      break;
    }

    if(width>60) {
      logmsg("'%s'", data);
      width = 0;
      optr = data;
    }
  }
  if(width)
    logmsg("'%s'", data);
}

#ifdef SIGPIPE
static void sigpipe_handler(int sig)
{
  (void)sig; /* prevent warning */
  sigpipe = 1;
}
#endif

char use_ipv6=FALSE;
unsigned short port = DEFAULT_PORT;
unsigned short connectport = 0; /* if non-zero, we activate this mode */

enum sockmode {
  PASSIVE_LISTEN,    /* as a server waiting for connections */
  PASSIVE_CONNECT,   /* as a server, connected to a client */
  ACTIVE,            /* as a client, connected to a server */
  ACTIVE_DISCONNECT  /* as a client, disconnected from server */
};

/*
  sockfdp is a pointer to an established stream or CURL_SOCKET_BAD

  if sockfd is CURL_SOCKET_BAD, listendfd is a listening socket we must
  accept()
*/
static int juggle(curl_socket_t *sockfdp,
                  curl_socket_t listenfd,
                  enum sockmode *mode)
{
  struct timeval timeout;
  fd_set fds_read;
  fd_set fds_write;
  fd_set fds_err;
  curl_socket_t sockfd;
  curl_socket_t maxfd;
  ssize_t rc;
  ssize_t nread_stdin;
  ssize_t nread_socket;
  ssize_t bytes_written;
  ssize_t buffer_len;

 /* 'buffer' is this excessively large only to be able to support things like
    test 1003 which tests exceedingly large server response lines */
  unsigned char buffer[17010];
  char data[16];

  timeout.tv_sec = 120;
  timeout.tv_usec = 0;

  FD_ZERO(&fds_read);
  FD_ZERO(&fds_write);
  FD_ZERO(&fds_err);

  FD_SET(fileno(stdin), &fds_read);

  switch(*mode) {

  case PASSIVE_LISTEN:

    /* server mode */
    sockfd = listenfd;
    /* there's always a socket to wait for */
    FD_SET(sockfd, &fds_read);
    maxfd = sockfd;
    break;

  case PASSIVE_CONNECT:

    sockfd = *sockfdp;
    if(CURL_SOCKET_BAD == sockfd) {
      /* eeek, we are supposedly connected and then this cannot be -1 ! */
      logmsg("socket is -1! on %s:%d", __FILE__, __LINE__);
      maxfd = 0; /* stdin */
    }
    else {
      /* there's always a socket to wait for */
      FD_SET(sockfd, &fds_read);
      maxfd = sockfd;
    }
    break;

  case ACTIVE:

    sockfd = *sockfdp;
    /* sockfd turns CURL_SOCKET_BAD when our connection has been closed */
    if(CURL_SOCKET_BAD != sockfd) {
      FD_SET(sockfd, &fds_read);
      maxfd = sockfd;
    }
    else {
      logmsg("No socket to read on");
      maxfd = 0;
    }
    break;

  case ACTIVE_DISCONNECT:

    logmsg("disconnected, no socket to read on");
    maxfd = 0;
    sockfd = CURL_SOCKET_BAD;
    break;

  } /* switch(*mode) */

  do {
    rc = select(maxfd + 1, &fds_read, &fds_write, &fds_err, &timeout);
  } while((rc == -1) && (SOCKERRNO == EINTR));

  switch(rc) {
  case -1:
    return FALSE;

  case 0: /* timeout! */
    return TRUE;
  }


  if(FD_ISSET(fileno(stdin), &fds_read)) {
    /* read from stdin, commands/data to be dealt with and possibly passed on
       to the socket

       protocol:

       4 letter command + LF [mandatory]

       4-digit hexadecimal data length + LF [if the command takes data]
       data                       [the data being as long as set above]

       Commands:

       DATA - plain pass-thru data
    */
    nread_stdin = read(fileno(stdin), buffer, 5);
    if(5 == nread_stdin) {

      logmsg("Received %c%c%c%c (on stdin)",
             buffer[0], buffer[1], buffer[2], buffer[3] );

      if(!memcmp("PING", buffer, 4)) {
        /* send reply on stdout, just proving we are alive */
        write(fileno(stdout), "PONG\n", 5);
      }

      else if(!memcmp("PORT", buffer, 4)) {
        /* Question asking us what PORT number we are listening to.
           Replies to PORT with "IPv[num]/[port]" */
        sprintf((char *)buffer, "IPv%d/%d\n", use_ipv6?6:4, (int)port);
        buffer_len = (ssize_t)strlen((char *)buffer);
        snprintf(data, sizeof(data), "PORT\n%04x\n", buffer_len);
        write(fileno(stdout), data, 10);
        write(fileno(stdout), buffer, buffer_len);
      }
      else if(!memcmp("QUIT", buffer, 4)) {
        /* just die */
        logmsg("quits");
        return FALSE;
      }
      else if(!memcmp("DATA", buffer, 4)) {
        /* data IN => data OUT */

        if(5 != read(fileno(stdin), buffer, 5))
          return FALSE;
        buffer[5] = '\0';

        buffer_len = (ssize_t)strtol((char *)buffer, NULL, 16);
        if (buffer_len > (ssize_t)sizeof(buffer)) {
          logmsg("Buffer size %d too small for data size %d", 
                   (int)sizeof(buffer), buffer_len);
          return FALSE;
        }
        logmsg("> %d bytes data, server => client", buffer_len);

        if(buffer_len > (ssize_t)sizeof(buffer)) {
          logmsg("ERROR: %d bytes of data does not fit within the %d "
                 "bytes buffer", buffer_len, sizeof(buffer));
          return FALSE;
        }

        /*
         * To properly support huge data chunks, we need to repeat the call
         * to read() until we're done or it fails.
         */
        nread_stdin = 0;
        do {
          /* get data in the buffer at the correct position */
          rc = read(fileno(stdin), &buffer[nread_stdin],
                    buffer_len - nread_stdin);
          logmsg("read %d bytes", rc);
          if(rc <= 0)
            return FALSE;
          nread_stdin += rc;
        } while (nread_stdin < buffer_len);

        lograw(buffer, buffer_len);

        if(*mode == PASSIVE_LISTEN) {
          logmsg("*** We are disconnected!");
          write(fileno(stdout), "DISC\n", 5);
        }
        else {
          /* send away on the socket */
          bytes_written = swrite(sockfd, buffer, buffer_len);
          if(bytes_written != buffer_len) {
            logmsg("Not all data was sent. Bytes to send: %d sent: %d", 
                   buffer_len, bytes_written);
          }
        }
      }
      else if(!memcmp("DISC", buffer, 4)) {
        /* disconnect! */
        write(fileno(stdout), "DISC\n", 5);
        if(sockfd != CURL_SOCKET_BAD) {
          logmsg("====> Client forcibly disconnected");
          sclose(sockfd);
          *sockfdp = CURL_SOCKET_BAD;
          if(*mode == PASSIVE_CONNECT)
            *mode = PASSIVE_LISTEN;
          else
            *mode = ACTIVE_DISCONNECT;
        }
        else
          logmsg("attempt to close already dead connection");
        return TRUE;
      }
    }
    else if(-1 == nread_stdin) {
      logmsg("read %d from stdin, exiting", nread_stdin);
      return FALSE;
    }
  }


  if((sockfd != CURL_SOCKET_BAD) && (FD_ISSET(sockfd, &fds_read)) ) {

    if(*mode == PASSIVE_LISTEN) {
      /* there's no stream set up yet, this is an indication that there's a
         client connecting. */
      sockfd = accept(sockfd, NULL, NULL);
      if(CURL_SOCKET_BAD == sockfd)
        logmsg("accept() failed");
      else {
        logmsg("====> Client connect");
        write(fileno(stdout), "CNCT\n", 5);
        *sockfdp = sockfd; /* store the new socket */
        *mode = PASSIVE_CONNECT; /* we have connected */
      }
      return TRUE;
    }

    /* read from socket, pass on data to stdout */
    nread_socket = sread(sockfd, buffer, sizeof(buffer));

    if(nread_socket <= 0) {
      logmsg("====> Client disconnect");
      write(fileno(stdout), "DISC\n", 5);
      sclose(sockfd);
      *sockfdp = CURL_SOCKET_BAD;
      if(*mode == PASSIVE_CONNECT)
        *mode = PASSIVE_LISTEN;
      else
        *mode = ACTIVE_DISCONNECT;
      return TRUE;
    }

    snprintf(data, sizeof(data), "DATA\n%04x\n", nread_socket);
    write(fileno(stdout), data, 10);
    write(fileno(stdout), buffer, nread_socket);

    logmsg("< %d bytes data, client => server", nread_socket);
    lograw(buffer, nread_socket);
  }

  return TRUE;
}

static curl_socket_t sockdaemon(curl_socket_t sock,
                                unsigned short *port)
{
  /* passive daemon style */
  struct sockaddr_in me;
#ifdef ENABLE_IPV6
  struct sockaddr_in6 me6;
#endif /* ENABLE_IPV6 */
  int flag = 1;
  int rc;
  int maxretr = 12;
  int delay= 10;

  rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
       (void *)&flag, sizeof(flag));
  while ((rc < 0) && maxretr) {
    maxretr--;
    go_sleep(delay);
    delay *= 2; /* double the sleep for next attempt */
    rc = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
         (void *)&flag, sizeof(flag));
  }
  if (rc < 0) {
    perror("setsockopt(SO_REUSEADDR)");
  }

#ifdef ENABLE_IPV6
  if(!use_ipv6) {
#endif
    me.sin_family = AF_INET;
    me.sin_addr.s_addr = INADDR_ANY;
    me.sin_port = htons(*port);
    rc = bind(sock, (struct sockaddr *) &me, sizeof(me));
#ifdef ENABLE_IPV6
  }
  else {
    memset(&me6, 0, sizeof(struct sockaddr_in6));
    me6.sin6_family = AF_INET6;
    me6.sin6_addr = in6addr_any;
    me6.sin6_port = htons(*port);
    rc = bind(sock, (struct sockaddr *) &me6, sizeof(me6));
  }
#endif /* ENABLE_IPV6 */
  if(rc < 0) {
    perror("binding stream socket");
    logmsg("Error binding socket");
    return CURL_SOCKET_BAD;
  }

  if(!*port) {
    /* The system picked a port number, now figure out which port we actually
       got */
    /* we succeeded to bind */
    struct sockaddr_in add;
    socklen_t socksize = sizeof(add);

    if(getsockname(sock, (struct sockaddr *) &add,
                   &socksize)<0) {
      logmsg("getsockname() failed with error: %d", SOCKERRNO);
      return CURL_SOCKET_BAD;
    }
    *port = ntohs(add.sin_port);
  }

  /* start accepting connections */
  rc = listen(sock, 4);
  if(0 != rc) {
    logmsg("listen() failed with error: %d", SOCKERRNO);
    sclose(sock);
    return CURL_SOCKET_BAD;
  }

  return sock;
}

static curl_socket_t mksock(bool use_ipv6)
{
  curl_socket_t sock;
#ifdef ENABLE_IPV6
  if(!use_ipv6)
#else
    (void)use_ipv6;
#endif
  sock = socket(AF_INET, SOCK_STREAM, 0);
#ifdef ENABLE_IPV6
  else
    sock = socket(AF_INET6, SOCK_STREAM, 0);
#endif

  if (CURL_SOCKET_BAD == sock) {
    perror("opening stream socket");
    logmsg("Error opening socket");
  }

  return sock;
}


int main(int argc, char *argv[])
{
  struct sockaddr_in me;
#ifdef ENABLE_IPV6
  struct sockaddr_in6 me6;
#endif /* ENABLE_IPV6 */
  curl_socket_t sock;
  curl_socket_t msgsock;
  FILE *pidfile;
  char *pidname= (char *)".sockfilt.pid";
  int rc;
  int error;
  int arg=1;
  enum sockmode mode = PASSIVE_LISTEN; /* default */
  const char *addr = NULL;

  while(argc>arg) {
    if(!strcmp("--version", argv[arg])) {
      printf("sockfilt IPv4%s\n",
#ifdef ENABLE_IPV6
             "/IPv6"
#else
             ""
#endif
             );
      return 0;
    }
    else if(!strcmp("--pidfile", argv[arg])) {
      arg++;
      if(argc>arg)
        pidname = argv[arg++];
    }
    else if(!strcmp("--logfile", argv[arg])) {
      arg++;
      if(argc>arg)
        serverlogfile = argv[arg++];
    }
    else if(!strcmp("--ipv6", argv[arg])) {
#ifdef ENABLE_IPV6
      use_ipv6=TRUE;
#endif
      arg++;
    }
    else if(!strcmp("--ipv4", argv[arg])) {
      /* for completeness, we support this option as well */
      use_ipv6=FALSE;
      arg++;
    }
    else if(!strcmp("--port", argv[arg])) {
      arg++;
      if(argc>arg) {
        port = (unsigned short)atoi(argv[arg]);
        arg++;
      }
    }
    else if(!strcmp("--connect", argv[arg])) {
      /* Asked to actively connect to the specified local port instead of
         doing a passive server-style listening. */
      arg++;
      if(argc>arg) {
        connectport = (unsigned short)atoi(argv[arg]);
        arg++;
      }
    }
    else if(!strcmp("--addr", argv[arg])) {
      /* Set an IP address to use with --connect; otherwise use localhost */
      arg++;
      if(argc>arg) {
        addr = argv[arg];
        arg++;
      }
    }
    else {
      puts("Usage: sockfilt [option]\n"
           " --version\n"
           " --logfile [file]\n"
           " --pidfile [file]\n"
           " --ipv4\n"
           " --ipv6\n"
           " --port [port]\n"
           " --connect [port]\n"
           " --addr [address]");
      return 0;
    }
  }

#ifdef WIN32
  win32_init();
  atexit(win32_cleanup);
#else

#ifdef SIGPIPE
#ifdef HAVE_SIGNAL
  signal(SIGPIPE, sigpipe_handler);
#endif
#ifdef HAVE_SIGINTERRUPT
  siginterrupt(SIGPIPE, 1);
#endif
#endif
#endif


  sock = mksock(use_ipv6);
  if (CURL_SOCKET_BAD == sock) {
    logmsg("Error opening socket: %d", SOCKERRNO);
    return 1;
  }

  if(connectport) {
    /* Active mode, we should connect to the given port number */
    mode = ACTIVE;
#ifdef ENABLE_IPV6
    if(!use_ipv6) {
#endif
      memset(&me, 0, sizeof(me));
      me.sin_family = AF_INET;
      me.sin_port = htons(connectport);
      me.sin_addr.s_addr = INADDR_ANY;
      if (!addr)
        addr = "127.0.0.1";
      Curl_inet_pton(AF_INET, addr, &me.sin_addr);

      rc = connect(sock, (struct sockaddr *) &me, sizeof(me));
#ifdef ENABLE_IPV6
    }
    else {
      memset(&me6, 0, sizeof(me6));
      me6.sin6_family = AF_INET6;
      me6.sin6_port = htons(connectport);
      if (!addr)
        addr = "::1";
      Curl_inet_pton(AF_INET6, addr, &me6.sin6_addr);

      rc = connect(sock, (struct sockaddr *) &me6, sizeof(me6));
    }
#endif /* ENABLE_IPV6 */
    if(rc) {
      perror("connecting stream socket");
      logmsg("Error connecting to port %d", port);
      sclose(sock);
      return 1;
    }
    logmsg("====> Client connect");
    msgsock = sock; /* use this as stream */
  }
  else {
    /* passive daemon style */
    sock = sockdaemon(sock, &port);
    if(CURL_SOCKET_BAD == sock)
      return 1;
    msgsock = CURL_SOCKET_BAD; /* no stream socket yet */
  }

  logmsg("Running IPv%d version",
         (use_ipv6?6:4));

  if(connectport)
    logmsg("Connected to port %d", connectport);
  else
    logmsg("Listening on port %d", port);

  pidfile = fopen(pidname, "w");
  if(pidfile) {
    int pid = (int)getpid();
    fprintf(pidfile, "%d\n", pid);
    fclose(pidfile);
    logmsg("Wrote pid %d to %s", pid, pidname);
  }
  else {
    error = ERRNO;
    logmsg("fopen() failed with error: %d %s\n", error, strerror(error));
    logmsg("Error opening file: %s\n", pidname);
    logmsg("Couldn't write pid file\n");
    sclose(sock);
    return 1;
  }

  while(juggle(&msgsock, sock, &mode));

  sclose(sock);

  return 0;
}