aboutsummaryrefslogtreecommitdiff
path: root/src/tool_cb_hdr.c
blob: e6988184a843a281819a9212f0846d7031aaaed2 (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
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2012, 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.
 *
 ***************************************************************************/
#include "tool_setup.h"

#include "curl_rawstr.h"

#define ENABLE_CURLX_PRINTF
/* use our own printf() functions */
#include "curlx.h"

#include "tool_cfgable.h"
#include "tool_msgs.h"
#include "tool_cb_hdr.h"

#include "curl_memdebug.h" /* keep this as LAST include */

static char *parse_filename(const char *ptr, size_t len);

/*
** callback for CURLOPT_HEADERFUNCTION
*/

size_t tool_header_cb(void *ptr, size_t size, size_t nmemb, void *userdata)
{
  struct HdrCbData *hdrcbdata = userdata;
  struct OutStruct *outs = hdrcbdata->outs;
  struct OutStruct *heads = hdrcbdata->heads;
  const char *str = ptr;
  const size_t cb = size * nmemb;
  const char *end = (char*)ptr + cb;

  /*
   * Once that libcurl has called back tool_header_cb() the returned value
   * is checked against the amount that was intended to be written, if
   * it does not match then it fails with CURLE_WRITE_ERROR. So at this
   * point returning a value different from sz*nmemb indicates failure.
   */
  size_t failure = (size * nmemb) ? 0 : 1;

  if(!heads->config)
    return failure;

#ifdef DEBUGBUILD
  if(size * nmemb > (size_t)CURL_MAX_HTTP_HEADER) {
    warnf(heads->config, "Header data exceeds single call write limit!\n");
    return failure;
  }
#endif

  /*
   * Write header data when curl option --dump-header (-D) is given.
   */

  if(heads->config->headerfile && heads->stream) {
    size_t rc = fwrite(ptr, size, nmemb, heads->stream);
    if(rc != cb)
      return rc;
  }

  /*
   * This callback sets the filename where output shall be written when
   * curl options --remote-name (-O) and --remote-header-name (-J) have
   * been simultaneously given and additionally server returns an HTTP
   * Content-Disposition header specifying a filename property.
   */

  if(hdrcbdata->honor_cd_filename &&
     (cb > 20) && checkprefix("Content-disposition:", str)) {
    const char *p = str + 20;

    /* look for the 'filename=' parameter
       (encoded filenames (*=) are not supported) */
    for(;;) {
      char *filename;
      size_t len;

      while(*p && (p < end) && !ISALPHA(*p))
        p++;
      if(p > end - 9)
        break;

      if(memcmp(p, "filename=", 9)) {
        /* no match, find next parameter */
        while((p < end) && (*p != ';'))
          p++;
        continue;
      }
      p += 9;

      /* this expression below typecasts 'cb' only to avoid
         warning: signed and unsigned type in conditional expression
      */
      len = (ssize_t)cb - (p - str);
      filename = parse_filename(p, len);
      if(filename) {
        outs->filename = filename;
        outs->alloc_filename = TRUE;
        outs->is_cd_filename = TRUE;
        outs->s_isreg = TRUE;
        outs->fopened = FALSE;
        outs->stream = NULL;
        hdrcbdata->honor_cd_filename = FALSE;
        break;
      }
      else
        return failure;
    }
  }

  return cb;
}

/*
 * Copies a file name part and returns an ALLOCATED data buffer.
 */
static char *parse_filename(const char *ptr, size_t len)
{
  char *copy;
  char *p;
  char *q;
  char  stop = '\0';

  /* simple implementation of strndup() */
  copy = malloc(len+1);
  if(!copy)
    return NULL;
  memcpy(copy, ptr, len);
  copy[len] = '\0';

  p = copy;
  if(*p == '\'' || *p == '"') {
    /* store the starting quote */
    stop = *p;
    p++;
  }
  else
    stop = ';';

  /* if the filename contains a path, only use filename portion */
  q = strrchr(copy, '/');
  if(q) {
    p = q + 1;
    if(!*p) {
      Curl_safefree(copy);
      return NULL;
    }
  }

  /* If the filename contains a backslash, only use filename portion. The idea
     is that even systems that don't handle backslashes as path separators
     probably want the path removed for convenience. */
  q = strrchr(p, '\\');
  if(q) {
    p = q + 1;
    if(!*p) {
      Curl_safefree(copy);
      return NULL;
    }
  }

  /* scan for the end letter and stop there */
  q = p;
  while(*q) {
    if(q[1] && (q[0] == '\\'))
      q++;
    else if(q[0] == stop)
      break;
    q++;
  }
  *q = '\0';

  /* make sure the file name doesn't end in \r or \n */
  q = strchr(p, '\r');
  if(q)
    *q = '\0';

  q = strchr(p, '\n');
  if(q)
    *q = '\0';

  if(copy != p)
    memmove(copy, p, strlen(p) + 1);

  /* in case we built debug enabled, we allow an evironment variable
   * named CURL_TESTDIR to prefix the given file name to put it into a
   * specific directory
   */
#ifdef DEBUGBUILD
  {
    char *tdir = curlx_getenv("CURL_TESTDIR");
    if(tdir) {
      char buffer[512]; /* suitably large */
      snprintf(buffer, sizeof(buffer), "%s/%s", tdir, copy);
      Curl_safefree(copy);
      copy = strdup(buffer); /* clone the buffer, we don't use the libcurl
                                aprintf() or similar since we want to use the
                                same memory code as the "real" parse_filename
                                function */
      curl_free(tdir);
    }
  }
#endif

  return copy;
}