aboutsummaryrefslogtreecommitdiff
path: root/lib/connect.c
blob: 3fe0e0eb0b6a48aad70983a61d5e1390be946451 (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
/*****************************************************************************
 *                                  _   _ ____  _     
 *  Project                     ___| | | |  _ \| |    
 *                             / __| | | | |_) | |    
 *                            | (__| |_| |  _ <| |___ 
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2002, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * In order to be useful for every potential user, curl and libcurl are
 * dual-licensed under the MPL and the MIT/X-derivate licenses.
 *
 * 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 MPL or the MIT/X-derivate
 * licenses. You may pick one of these licenses.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 *****************************************************************************/

#include "setup.h"

#ifndef WIN32
/* headers for non-win32 */
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h> /* required for free() prototype, without it, this crashes
                       on macos 68K */
#endif
#ifdef	VMS
#include <in.h>
#include <inet.h>
#endif

#endif
#include <stdio.h>
#include <errno.h>
#include <string.h>

#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif

#ifdef WIN32
#define HAVE_IOCTLSOCKET
#include <windows.h>
#include <winsock.h>
#define EINPROGRESS WSAEINPROGRESS
#define EWOULDBLOCK WSAEWOULDBLOCK
#define EISCONN     WSAEISCONN
#endif

#include "urldata.h"
#include "sendf.h"
#include "if2ip.h"

/* The last #include file should be: */
#ifdef MALLOCDEBUG
#include "memdebug.h"
#endif

static
int geterrno(void)
{
#ifdef WIN32
  return (int)GetLastError();
#else
  return errno;
#endif
}

/*************************************************************************
 * Curl_nonblock
 *
 * Description:
 *  Set the socket to either blocking or non-blocking mode.
 */

int Curl_nonblock(int socket,    /* operate on this */
                  int nonblock   /* TRUE or FALSE */)
{
#undef SETBLOCK
#ifdef HAVE_O_NONBLOCK
  int flags;

  flags = fcntl(socket, F_GETFL, 0);
  if (TRUE == nonblock)
    return fcntl(socket, F_SETFL, flags | O_NONBLOCK);
  else
    return fcntl(socket, F_SETFL, flags & (~O_NONBLOCK));
#define SETBLOCK 1
#endif

#ifdef HAVE_FIONBIO
  int flags;

  flags = nonblock;
  return ioctl(socket, FIONBIO, &flags);
#define SETBLOCK 2
#endif

#ifdef HAVE_IOCTLSOCKET
  int flags;
  flags = nonblock;
  return ioctlsocket(socket, FIONBIO, &flags);
#define SETBLOCK 3
#endif

#ifdef HAVE_IOCTLSOCKET_CASE
  return IoctlSocket(socket, FIONBIO, (long)nonblock);
#define SETBLOCK 4
#endif

#ifdef HAVE_DISABLED_NONBLOCKING
  return 0; /* returns success */
#define SETBLOCK 5
#endif

#ifndef SETBLOCK
#error "no non-blocking method was found/used/set"
#endif
}

/*
 * Return 0 on fine connect, -1 on error and 1 on timeout.
 */
static
int waitconnect(int sockfd, /* socket */
                int timeout_msec)
{
  fd_set fd;
  fd_set errfd;
  struct timeval interval;
  int rc;

  /* now select() until we get connect or timeout */
  FD_ZERO(&fd);
  FD_SET(sockfd, &fd);

  FD_ZERO(&errfd);
  FD_SET(sockfd, &errfd);

  interval.tv_sec = timeout_msec/1000;
  timeout_msec -= interval.tv_sec*1000;

  interval.tv_usec = timeout_msec*1000;

  rc = select(sockfd+1, NULL, &fd, &errfd, &interval);
  if(-1 == rc)
    /* error, no connect here, try next */
    return -1;
  
  else if(0 == rc)
    /* timeout, no connect today */
    return 1;

  if(FD_ISSET(sockfd, &errfd)) {
    /* error condition caught */
    return 2;
  }

  /* we have a connect! */
  return 0;
}

static CURLcode bindlocal(struct connectdata *conn,
                          int sockfd)
{
#if !defined(WIN32)||defined(__CYGWIN32__)
  /* We don't generally like checking for OS-versions, we should make this
     HAVE_XXXX based, although at the moment I don't have a decent test for
     this! */

#ifdef HAVE_INET_NTOA

#ifndef INADDR_NONE
#define INADDR_NONE (in_addr_t) ~0
#endif

  struct SessionHandle *data = conn->data;

  /*************************************************************
   * Select device to bind socket to
   *************************************************************/
  if (strlen(data->set.device)<255) {
    struct sockaddr_in sa;
    Curl_addrinfo *h=NULL;
    char *hostdataptr=NULL;
    size_t size;
    char myhost[256] = "";
    in_addr_t in;

    if(Curl_if2ip(data->set.device, myhost, sizeof(myhost))) {
      /*
       * We now have the numerical IPv4-style x.y.z.w in the 'myhost' buffer
       */
      h = Curl_resolv(data, myhost, 0, &hostdataptr);
    }
    else {
      if(strlen(data->set.device)>1) {
        /*
         * This was not an interface, resolve the name as a host name
         * or IP number
         */
        h = Curl_resolv(data, data->set.device, 0, &hostdataptr);
        if(h) {
          /* we know data->set.device is shorter than the myhost array */
          strcpy(myhost, data->set.device);
        }
      }
    }

    if(! *myhost) {
      /* need to fix this
         h=Curl_gethost(data,
         getmyhost(*myhost,sizeof(myhost)),
         hostent_buf,
         sizeof(hostent_buf));
      */
      return CURLE_HTTP_PORT_FAILED;
    }

    infof(data, "We bind local end to %s\n", myhost);

    in=inet_addr(myhost);
    if (INADDR_NONE != in) {

      if ( h ) {
        memset((char *)&sa, 0, sizeof(sa));
#ifdef ENABLE_IPV6
        memcpy((char *)&sa.sin_addr, h->ai_addr, h->ai_addrlen);        
        sa.sin_family = h->ai_family;
#else
        memcpy((char *)&sa.sin_addr, h->h_addr, h->h_length);
        sa.sin_family = AF_INET;
#endif
        sa.sin_addr.s_addr = in;
        sa.sin_port = 0; /* get any port */
	
        if( bind(sockfd, (struct sockaddr *)&sa, sizeof(sa)) >= 0) {
          /* we succeeded to bind */
          struct sockaddr_in add;
	
          size = sizeof(add);
          if(getsockname(sockfd, (struct sockaddr *) &add,
                         (socklen_t *)&size)<0) {
            failf(data, "getsockname() failed");
            return CURLE_HTTP_PORT_FAILED;
          }
        }
        else {
          switch(errno) {
          case EBADF:
            failf(data, "Invalid descriptor: %d", errno);
            break;
          case EINVAL:
            failf(data, "Invalid request: %d", errno);
            break;
          case EACCES:
            failf(data, "Address is protected, user not superuser: %d", errno);
            break;
          case ENOTSOCK:
            failf(data,
                  "Argument is a descriptor for a file, not a socket: %d",
                  errno);
            break;
          case EFAULT:
            failf(data, "Inaccessable memory error: %d", errno);
            break;
          case ENAMETOOLONG:
            failf(data, "Address too long: %d", errno);
            break;
          case ENOMEM:
            failf(data, "Insufficient kernel memory was available: %d", errno);
            break;
          default:
            failf(data, "errno %d", errno);
            break;
          } /* end of switch(errno) */
	
          return CURLE_HTTP_PORT_FAILED;
        } /* end of else */
	
      } /* end of if  h */
      else {
	failf(data,"could't find my own IP address (%s)", myhost);
	return CURLE_HTTP_PORT_FAILED;
      }
    } /* end of inet_addr */

    else {
      failf(data, "could't find my own IP address (%s)", myhost);
      return CURLE_HTTP_PORT_FAILED;
    }

    return CURLE_OK;

  } /* end of device selection support */
#endif /* end of HAVE_INET_NTOA */
#endif /* end of not WIN32 */

  return CURLE_HTTP_PORT_FAILED;
}


static
int socketerror(int sockfd)
{
  int err = 0;
  socklen_t errSize = sizeof(err);

  if( -1 == getsockopt(sockfd, SOL_SOCKET, SO_ERROR,
                       (void *)&err, &errSize))
    err = geterrno();
  
  return err;
}

/*
 * TCP connect to the given host with timeout, proxy or remote doesn't matter.
 * There might be more than one IP address to try out. Fill in the passed
 * pointer with the connected socket.
 */

CURLcode Curl_connecthost(struct connectdata *conn,  /* context */
                          Curl_addrinfo *remotehost, /* use one in here */
                          int port,                  /* connect to this */
                          int *sockconn,             /* the connected socket */
                          Curl_ipconnect **addr)     /* the one we used */
{
  struct SessionHandle *data = conn->data;
  int rc;
  int sockfd=-1;
  int aliasindex=0;

  struct timeval after;
  struct timeval before = Curl_tvnow();

  /*************************************************************
   * Figure out what maximum time we have left
   *************************************************************/
  long timeout_ms=300000; /* milliseconds, default to five minutes */
  if(data->set.timeout || data->set.connecttimeout) {
    double has_passed;

    /* Evaluate in milliseconds how much time that has passed */
    has_passed = Curl_tvdiff(Curl_tvnow(), data->progress.start);

#ifndef min
#define min(a, b)   ((a) < (b) ? (a) : (b))
#endif

    /* get the most strict timeout of the ones converted to milliseconds */
    if(data->set.timeout && data->set.connecttimeout) {
      if (data->set.timeout < data->set.connecttimeout)
        timeout_ms = data->set.timeout*1000;
      else 
        timeout_ms = data->set.connecttimeout*1000;
    }
    else if(data->set.timeout)
      timeout_ms = data->set.timeout*1000;
    else
      timeout_ms = data->set.connecttimeout*1000;

    /* subtract the passed time */
    timeout_ms -= (long)has_passed;

    if(timeout_ms < 0) {
      /* a precaution, no need to continue if time already is up */
      failf(data, "Connection time-out");
      return CURLE_OPERATION_TIMEOUTED;
    }
  }

  infof(data, "About to connect() to %s:%d\n",
        data->change.proxy?conn->proxyhost:conn->hostname, port);

#ifdef ENABLE_IPV6
  /*
   * Connecting with IPv6 support is so much easier and cleanly done
   */
  {
    struct addrinfo *ai;
    port =0; /* prevent compiler warning */

    for (ai = remotehost; ai; ai = ai->ai_next, aliasindex++) {
      sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
      if (sockfd < 0)
        continue;

      if(conn->data->set.device) {
        /* user selected to bind the outgoing socket to a specified "device"
           before doing connect */
        CURLcode res = bindlocal(conn, sockfd);
        if(res)
          return res;
      }

      /* set socket non-blocking */
      Curl_nonblock(sockfd, TRUE);

      rc = connect(sockfd, ai->ai_addr, ai->ai_addrlen);

      if(-1 == rc) {
        int error=geterrno();

        switch (error) {
        case EINPROGRESS:
        case EWOULDBLOCK:
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
          /* On some platforms EAGAIN and EWOULDBLOCK are the
           * same value, and on others they are different, hence
           * the odd #if
           */
        case EAGAIN:
#endif
        case EINTR:

          /* asynchronous connect, wait for connect or timeout */
          rc = waitconnect(sockfd, timeout_ms);
          break;
        case ECONNREFUSED: /* no one listening */
        default:
          /* unknown error, fallthrough and try another address! */
          failf(data, "Failed to connect: %d", error);
          break;
        }
      }
      if(0 == rc) {
        /* we might be connected, if the socket says it is OK! Ask it! */
        int err;

        err = socketerror(sockfd);
        if ((0 == err) || (EISCONN == err)) {
          /* we are connected, awesome! */
          break;
	}
        /* we are _not_ connected, it was a false alert, continue please */
      }

      /* connect failed or timed out */
      sclose(sockfd);
      sockfd = -1;

      /* get a new timeout for next attempt */
      after = Curl_tvnow();
      timeout_ms -= Curl_tvdiff(after, before);
      if(timeout_ms < 0) {
        failf(data, "connect() timed out!");
        return CURLE_OPERATION_TIMEOUTED;
      }
      before = after;
      continue;
    }
    if (sockfd < 0) {
      failf(data, "connect() failed");
      return CURLE_COULDNT_CONNECT;
    }

    /* leave the socket in non-blocking mode */

    if(addr)
      *addr = ai; /* the address we ended up connected to */
  }
#else
  /*
   * Connecting with IPv4-only support
   */
  if(!remotehost->h_addr_list[0]) {
    /* If there is no addresses in the address list, then we return
       error right away */
    failf(data, "no address available");
    return CURLE_COULDNT_CONNECT;
  }
  /* create an IPv4 TCP socket */
  sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if(-1 == sockfd) {
    failf(data, "couldn't create socket");
    return CURLE_COULDNT_CONNECT; /* big time error */
  }
  
  if(conn->data->set.device) {
    /* user selected to bind the outgoing socket to a specified "device"
       before doing connect */
    CURLcode res = bindlocal(conn, sockfd);
    if(res)
      return res;
  }

  /* Convert socket to non-blocking type */
  Curl_nonblock(sockfd, TRUE);

  /* This is the loop that attempts to connect to all IP-addresses we
     know for the given host. One by one. */
  for(rc=-1, aliasindex=0;
      rc && (struct in_addr *)remotehost->h_addr_list[aliasindex];
      aliasindex++) {
    struct sockaddr_in serv_addr;

    /* do this nasty work to do the connect */
    memset((char *) &serv_addr, '\0', sizeof(serv_addr));
    memcpy((char *)&(serv_addr.sin_addr),
           (struct in_addr *)remotehost->h_addr_list[aliasindex],
           sizeof(struct in_addr));
    serv_addr.sin_family = remotehost->h_addrtype;
    serv_addr.sin_port = htons(port);
  
    rc = connect(sockfd, (struct sockaddr *)&serv_addr,
                 sizeof(serv_addr));

    if(-1 == rc) {
      int error=geterrno();

      switch (error) {
      case EINPROGRESS:
      case EWOULDBLOCK:
#if defined(EAGAIN) && EAGAIN != EWOULDBLOCK
        /* On some platforms EAGAIN and EWOULDBLOCK are the
         * same value, and on others they are different, hence
         * the odd #if
         */
      case EAGAIN:
#endif

        /* asynchronous connect, wait for connect or timeout */
        rc = waitconnect(sockfd, timeout_ms);
        break;
      default:
        /* unknown error, fallthrough and try another address! */
        failf(data, "Failed to connect to IP number %d: %d",
              aliasindex+1, error);
        break;
      }
    }

    if(0 == rc) {
      int err = socketerror(sockfd);
      if ((0 == err) || (EISCONN == err)) {
        /* we are connected, awesome! */
        break;
      }
      /* nope, not connected for real */
      rc = -1;
    }

    if(0 != rc) {
      /* get a new timeout for next attempt */
      after = Curl_tvnow();
      timeout_ms -= Curl_tvdiff(after, before);
      if(timeout_ms < 0) {
        failf(data, "Connect timeout on IP number %d", aliasindex+1);
        break;
      }
      before = after;
      continue; /* try next address */
    }
    break;
  }
  if(0 != rc) {
    /* no good connect was made */
    sclose(sockfd);
    *sockconn = -1;
    failf(data, "Couldn't connect to host");
    return CURLE_COULDNT_CONNECT;
  }

  /* leave the socket in non-blocking mode */

  if(addr)
    /* this is the address we've connected to */
    *addr = (struct in_addr *)remotehost->h_addr_list[aliasindex];
#endif

  /* allow NULL-pointers to get passed in */
  if(sockconn)
    *sockconn = sockfd;    /* the socket descriptor we've connected */

  return CURLE_OK;
}