aboutsummaryrefslogtreecommitdiff
path: root/lib/sendf.c
blob: 4094c32396798ece909b2e89ccdb402abd8b98ab (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
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2004, 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.
 *
 * $Id$
 ***************************************************************************/

#include "setup.h"

#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <errno.h>

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h> /* required for send() & recv() prototypes */
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <curl/curl.h>
#include "urldata.h"
#include "sendf.h"
#include "connect.h" /* for the Curl_ourerrno() proto */

#define _MPRINTF_REPLACE /* use the internal *printf() functions */
#include <curl/mprintf.h>

#ifdef HAVE_KRB4
#include "security.h"
#endif
#include <string.h>
#include "memory.h"
#include "strerror.h"
/* The last #include file should be: */
#include "memdebug.h"

/* returns last node in linked list */
static struct curl_slist *slist_get_last(struct curl_slist *list)
{
  struct curl_slist     *item;

  /* if caller passed us a NULL, return now */
  if (!list)
    return NULL;

  /* loop through to find the last item */
  item = list;
  while (item->next) {
    item = item->next;
  }
  return item;
}

/*
 * curl_slist_append() appends a string to the linked list. It always retunrs
 * the address of the first record, so that you can sure this function as an
 * initialization function as well as an append function. If you find this
 * bothersome, then simply create a separate _init function and call it
 * appropriately from within the proram.
 */
struct curl_slist *curl_slist_append(struct curl_slist *list,
                                     const char *data)
{
  struct curl_slist     *last;
  struct curl_slist     *new_item;

  new_item = (struct curl_slist *) malloc(sizeof(struct curl_slist));
  if (new_item) {
    char *dup = strdup(data);
    if(dup) {
      new_item->next = NULL;
      new_item->data = dup;
    }
    else {
      free(new_item);
      return NULL;
    }
  }
  else
    return NULL;

  if (list) {
    last = slist_get_last(list);
    last->next = new_item;
    return list;
  }

  /* if this is the first item, then new_item *is* the list */
  return new_item;
}

/* be nice and clean up resources */
void curl_slist_free_all(struct curl_slist *list)
{
  struct curl_slist     *next;
  struct curl_slist     *item;

  if (!list)
    return;

  item = list;
  do {
    next = item->next;

    if (item->data) {
      free(item->data);
    }
    free(item);
    item = next;
  } while (next);
}

/* Curl_infof() is for info message along the way */

void Curl_infof(struct SessionHandle *data, const char *fmt, ...)
{
  if(data && data->set.verbose) {
    va_list ap;
    char print_buffer[1024 + 1];
    va_start(ap, fmt);
    vsnprintf(print_buffer, 1024, fmt, ap);
    va_end(ap);
    Curl_debug(data, CURLINFO_TEXT, print_buffer, strlen(print_buffer), NULL);
  }
}

/* Curl_failf() is for messages stating why we failed.
 * The message SHALL NOT include any LF or CR.
 */

void Curl_failf(struct SessionHandle *data, const char *fmt, ...)
{
  va_list ap;
  size_t len;
  va_start(ap, fmt);

  vsnprintf(data->state.buffer, BUFSIZE, fmt, ap);

  if(data->set.errorbuffer && !data->state.errorbuf) {
    snprintf(data->set.errorbuffer, CURL_ERROR_SIZE, "%s", data->state.buffer);
    data->state.errorbuf = TRUE; /* wrote error string */
  }
  if(data->set.verbose) {
    len = strlen(data->state.buffer);
    if(len < BUFSIZE - 1) {
      data->state.buffer[len] = '\n';
      data->state.buffer[++len] = '\0';
    }
    Curl_debug(data, CURLINFO_TEXT, data->state.buffer, len, NULL);
  }

  va_end(ap);
}

/* Curl_sendf() sends formated data to the server */
CURLcode Curl_sendf(curl_socket_t sockfd, struct connectdata *conn,
                    const char *fmt, ...)
{
  struct SessionHandle *data = conn->data;
  ssize_t bytes_written;
  size_t write_len;
  CURLcode res;
  char *s;
  char *sptr;
  va_list ap;
  va_start(ap, fmt);
  s = vaprintf(fmt, ap); /* returns an allocated string */
  va_end(ap);
  if(!s)
    return CURLE_OUT_OF_MEMORY; /* failure */

  bytes_written=0;
  write_len = strlen(s);
  sptr = s;

  while (1) {
    /* Write the buffer to the socket */
    res = Curl_write(conn, sockfd, sptr, write_len, &bytes_written);

    if(CURLE_OK != res)
      break;

    if(data->set.verbose)
      Curl_debug(data, CURLINFO_DATA_OUT, sptr, bytes_written,
                 conn->host.dispname);

    if((size_t)bytes_written != write_len) {
      /* if not all was written at once, we must advance the pointer, decrease
         the size left and try again! */
      write_len -= bytes_written;
      sptr += bytes_written;
    }
    else
      break;
  }

  free(s); /* free the output string */

  return res;
}

/*
 * Curl_write() is an internal write function that sends plain (binary) data
 * to the server. Works with plain sockets, SSL or kerberos.
 */
CURLcode Curl_write(struct connectdata *conn,
                    curl_socket_t sockfd,
                    void *mem,
                    size_t len,
                    ssize_t *written)
{
  ssize_t bytes_written;
  CURLcode retcode;

#ifdef USE_SSLEAY
  /* Set 'num' to 0 or 1, depending on which socket that has been sent here.
     If it is the second socket, we set num to 1. Otherwise to 0. This lets
     us use the correct ssl handle. */
  int num = (sockfd == conn->sock[SECONDARYSOCKET]);
  /* SSL_write() is said to return 'int' while write() and send() returns
     'size_t' */
  if (conn->ssl[num].use) {
    int err;
    char error_buffer[120]; /* OpenSSL documents that this must be at least
                               120 bytes long. */
    unsigned long sslerror;
    int rc = SSL_write(conn->ssl[num].handle, mem, (int)len);

    if(rc < 0) {
      err = SSL_get_error(conn->ssl[num].handle, rc);

      switch(err) {
      case SSL_ERROR_WANT_READ:
      case SSL_ERROR_WANT_WRITE:
        /* The operation did not complete; the same TLS/SSL I/O function
           should be called again later. This is basicly an EWOULDBLOCK
           equivalent. */
        *written = 0;
        return CURLE_OK;
      case SSL_ERROR_SYSCALL:
        failf(conn->data, "SSL_write() returned SYSCALL, errno = %d\n",
              Curl_ourerrno());
        return CURLE_SEND_ERROR;
      case SSL_ERROR_SSL:
        /*  A failure in the SSL library occurred, usually a protocol error.
            The OpenSSL error queue contains more information on the error. */
        sslerror = ERR_get_error();
        failf(conn->data, "SSL_write() error: %s\n",
              ERR_error_string(sslerror, error_buffer));
        return CURLE_SEND_ERROR;
      }
      /* a true error */
      failf(conn->data, "SSL_write() return error %d\n", err);
      return CURLE_SEND_ERROR;
    }
    bytes_written = rc;
  }
  else {
#else
  (void)conn;
#endif
#ifdef HAVE_KRB4
    if(conn->sec_complete) {
      bytes_written = Curl_sec_write(conn, sockfd, mem, len);
    }
    else
#endif /* HAVE_KRB4 */
    {
      bytes_written = (ssize_t)swrite(sockfd, mem, len);
    }
    if(-1 == bytes_written) {
      int err = Curl_ourerrno();

      if(
#ifdef WSAEWOULDBLOCK
        /* This is how Windows does it */
        (WSAEWOULDBLOCK == err)
#else
        /* As pointed out by Christophe Demory on March 11 2003, errno
           may be EWOULDBLOCK or on some systems EAGAIN when it returned
           due to its inability to send off data without blocking. We
           therefor treat both error codes the same here */
        (EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err)
#endif
        )
        /* this is just a case of EWOULDBLOCK */
        bytes_written=0;
      else
        failf(conn->data, "Send failure: %s",
              Curl_strerror(conn, err));
    }
#ifdef USE_SSLEAY
  }
#endif

  *written = bytes_written;
  retcode = (-1 != bytes_written)?CURLE_OK:CURLE_SEND_ERROR;

  return retcode;
}

/* client_write() sends data to the write callback(s)

   The bit pattern defines to what "streams" to write to. Body and/or header.
   The defines are in sendf.h of course.
 */
CURLcode Curl_client_write(struct SessionHandle *data,
                           int type,
                           char *ptr,
                           size_t len)
{
  size_t wrote;

  if(0 == len)
    len = strlen(ptr);

  if(type & CLIENTWRITE_BODY) {
    wrote = data->set.fwrite(ptr, 1, len, data->set.out);
    if(wrote != len) {
      failf (data, "Failed writing body");
      return CURLE_WRITE_ERROR;
    }
  }
  if((type & CLIENTWRITE_HEADER) &&
     (data->set.fwrite_header || data->set.writeheader) ) {
    /*
     * Write headers to the same callback or to the especially setup
     * header callback function (added after version 7.7.1).
     */
    curl_write_callback writeit=
      data->set.fwrite_header?data->set.fwrite_header:data->set.fwrite;

    wrote = writeit(ptr, 1, len, data->set.writeheader);
    if(wrote != len) {
      failf (data, "Failed writing header");
      return CURLE_WRITE_ERROR;
    }
  }

  return CURLE_OK;
}

/*
 * Internal read-from-socket function. This is meant to deal with plain
 * sockets, SSL sockets and kerberos sockets.
 *
 * If the read would block (EWOULDBLOCK) we return -1. Otherwise we return
 * a regular CURLcode value.
 */
int Curl_read(struct connectdata *conn, /* connection data */
              curl_socket_t sockfd,     /* read from this socket */
              char *buf,                /* store read data here */
              size_t buffersize,        /* max amount to read */
              ssize_t *n)               /* amount bytes read */
{
  ssize_t nread;
#ifdef USE_SSLEAY
  /* Set 'num' to 0 or 1, depending on which socket that has been sent here.
     If it is the second socket, we set num to 1. Otherwise to 0. This lets
     us use the correct ssl handle. */
  int num = (sockfd == conn->sock[SECONDARYSOCKET]);

  *n=0; /* reset amount to zero */

  if (conn->ssl[num].use) {
    nread = (ssize_t)SSL_read(conn->ssl[num].handle, buf, (int)buffersize);

    if(nread < 0) {
      /* failed SSL_read */
      int err = SSL_get_error(conn->ssl[num].handle, (int)nread);

      switch(err) {
      case SSL_ERROR_NONE: /* this is not an error */
      case SSL_ERROR_ZERO_RETURN: /* no more data */
        break;
      case SSL_ERROR_WANT_READ:
      case SSL_ERROR_WANT_WRITE:
        /* there's data pending, re-invoke SSL_read() */
        return -1; /* basicly EWOULDBLOCK */
      default:
        /* openssl/ssl.h says "look at error stack/return value/errno" */
        {
          char error_buffer[120]; /* OpenSSL documents that this must be at
                                     least 120 bytes long. */
          unsigned long sslerror = ERR_get_error();
          failf(conn->data, "SSL read: %s, errno %d",
                ERR_error_string(sslerror, error_buffer),
                Curl_ourerrno() );
        }
        return CURLE_RECV_ERROR;
      }
    }
  }
  else {
#else
    (void)conn;
#endif
    *n=0; /* reset amount to zero */
#ifdef HAVE_KRB4
    if(conn->sec_complete)
      nread = Curl_sec_read(conn, sockfd, buf, buffersize);
    else
#endif
      nread = sread(sockfd, buf, buffersize);

    if(-1 == nread) {
      int err = Curl_ourerrno();
#ifdef WIN32
      if(WSAEWOULDBLOCK == err)
#else
      if((EWOULDBLOCK == err) || (EAGAIN == err) || (EINTR == err))
#endif
        return -1;
    }

#ifdef USE_SSLEAY
  }
#endif /* USE_SSLEAY */
  *n = nread;
  return CURLE_OK;
}

/* return 0 on success */
static int showit(struct SessionHandle *data, curl_infotype type,
                  char *ptr, size_t size)
{
  static const char * const s_infotype[CURLINFO_END] = {
    "* ", "< ", "> ", "{ ", "} ", "{ ", "} " };

  if(data->set.fdebug)
    return (*data->set.fdebug)(data, type, ptr, size,
                               data->set.debugdata);

  switch(type) {
  case CURLINFO_TEXT:
  case CURLINFO_HEADER_OUT:
  case CURLINFO_HEADER_IN:
    fwrite(s_infotype[type], 2, 1, data->set.err);
    fwrite(ptr, size, 1, data->set.err);
    break;
  default: /* nada */
    break;
  }
  return 0;
}

int Curl_debug(struct SessionHandle *data, curl_infotype type,
               char *ptr, size_t size, char *host)
{
  int rc;
  if(data->set.printhost && host) {
    char buffer[160];
    const char *t=NULL;
    switch (type) {
    case CURLINFO_HEADER_IN:
    case CURLINFO_DATA_IN:
      t = "from";
      break;
    case CURLINFO_HEADER_OUT:
    case CURLINFO_DATA_OUT:
      t = "to";
      break;
    default:
      break;
    }

    if(t) {
      snprintf(buffer, sizeof(buffer), "[Data %s %s]", t, host);
      rc = showit(data, CURLINFO_TEXT, buffer, strlen(buffer));
      if(rc)
        return rc;
    }
  }
  rc = showit(data, type, ptr, size);
  return rc;
}