summaryrefslogtreecommitdiff
path: root/lib/curl_path.c
blob: cd659209639d4415c471fd8aaf52d4bcf1b15d12 (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
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2017, 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 https://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 "curl_setup.h"

#include <curl/curl.h>
#include "curl_memory.h"
#include "curl_path.h"
#include "escape.h"
#include "memdebug.h"

/* figure out the path to work with in this particular request */
CURLcode Curl_getworkingpath(struct connectdata *conn,
                             char *homedir,  /* when SFTP is used */
                             char **path) /* returns the  allocated
                                             real path to work with */
{
  struct Curl_easy *data = conn->data;
  char *real_path = NULL;
  char *working_path;
  size_t working_path_len;
  CURLcode result =
    Curl_urldecode(data, data->state.path, 0, &working_path,
                   &working_path_len, FALSE);
  if(result)
    return result;

  /* Check for /~/, indicating relative to the user's home directory */
  if(conn->handler->protocol & CURLPROTO_SCP) {
    real_path = malloc(working_path_len + 1);
    if(real_path == NULL) {
      free(working_path);
      return CURLE_OUT_OF_MEMORY;
    }
    if((working_path_len > 3) && (!memcmp(working_path, "/~/", 3)))
      /* It is referenced to the home directory, so strip the leading '/~/' */
      memcpy(real_path, working_path + 3, 4 + working_path_len-3);
    else
      memcpy(real_path, working_path, 1 + working_path_len);
  }
  else if(conn->handler->protocol & CURLPROTO_SFTP) {
    if((working_path_len > 1) && (working_path[1] == '~')) {
      size_t homelen = strlen(homedir);
      real_path = malloc(homelen + working_path_len + 1);
      if(real_path == NULL) {
        free(working_path);
        return CURLE_OUT_OF_MEMORY;
      }
      /* It is referenced to the home directory, so strip the
         leading '/' */
      memcpy(real_path, homedir, homelen);
      real_path[homelen] = '/';
      real_path[homelen + 1] = '\0';
      if(working_path_len > 3) {
        memcpy(real_path + homelen + 1, working_path + 3,
               1 + working_path_len -3);
      }
    }
    else {
      real_path = malloc(working_path_len + 1);
      if(real_path == NULL) {
        free(working_path);
        return CURLE_OUT_OF_MEMORY;
      }
      memcpy(real_path, working_path, 1 + working_path_len);
    }
  }

  free(working_path);

  /* store the pointer for the caller to receive */
  *path = real_path;

  return CURLE_OK;
}

/* The get_pathname() function is being borrowed from OpenSSH sftp.c
   version 4.6p1. */
/*
 * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
CURLcode Curl_get_pathname(const char **cpp, char **path)
{
  const char *cp = *cpp, *end;
  char quot;
  unsigned int i, j;
  static const char WHITESPACE[] = " \t\r\n";

  cp += strspn(cp, WHITESPACE);
  if(!*cp) {
    *cpp = cp;
    *path = NULL;
    return CURLE_QUOTE_ERROR;
  }

  *path = malloc(strlen(cp) + 1);
  if(*path == NULL)
    return CURLE_OUT_OF_MEMORY;

  /* Check for quoted filenames */
  if(*cp == '\"' || *cp == '\'') {
    quot = *cp++;

    /* Search for terminating quote, unescape some chars */
    for(i = j = 0; i <= strlen(cp); i++) {
      if(cp[i] == quot) {  /* Found quote */
        i++;
        (*path)[j] = '\0';
        break;
      }
      if(cp[i] == '\0') {  /* End of string */
        /*error("Unterminated quote");*/
        goto fail;
      }
      if(cp[i] == '\\') {  /* Escaped characters */
        i++;
        if(cp[i] != '\'' && cp[i] != '\"' &&
            cp[i] != '\\') {
          /*error("Bad escaped character '\\%c'",
              cp[i]);*/
          goto fail;
        }
      }
      (*path)[j++] = cp[i];
    }

    if(j == 0) {
      /*error("Empty quotes");*/
      goto fail;
    }
    *cpp = cp + i + strspn(cp + i, WHITESPACE);
  }
  else {
    /* Read to end of filename */
    end = strpbrk(cp, WHITESPACE);
    if(end == NULL)
      end = strchr(cp, '\0');
    *cpp = end + strspn(end, WHITESPACE);

    memcpy(*path, cp, end - cp);
    (*path)[end - cp] = '\0';
  }
  return CURLE_OK;

  fail:
  Curl_safefree(*path);
  return CURLE_QUOTE_ERROR;
}