Elliott Hughes | 0128fe4 | 2018-02-27 14:57:55 -0800 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * _ _ ____ _ |
| 3 | * Project ___| | | | _ \| | |
| 4 | * / __| | | | |_) | | |
| 5 | * | (__| |_| | _ <| |___ |
| 6 | * \___|\___/|_| \_\_____| |
| 7 | * |
| 8 | * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. |
| 9 | * |
| 10 | * This software is licensed as described in the file COPYING, which |
| 11 | * you should have received as part of this distribution. The terms |
| 12 | * are also available at https://curl.haxx.se/docs/copyright.html. |
| 13 | * |
| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
| 15 | * copies of the Software, and permit persons to whom the Software is |
| 16 | * furnished to do so, under the terms of the COPYING file. |
| 17 | * |
| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 19 | * KIND, either express or implied. |
| 20 | * |
| 21 | ***************************************************************************/ |
| 22 | |
| 23 | #include "curl_setup.h" |
| 24 | |
| 25 | #include <curl/curl.h> |
| 26 | #include "curl_memory.h" |
| 27 | #include "curl_path.h" |
| 28 | #include "escape.h" |
| 29 | #include "memdebug.h" |
| 30 | |
| 31 | /* figure out the path to work with in this particular request */ |
| 32 | CURLcode Curl_getworkingpath(struct connectdata *conn, |
| 33 | char *homedir, /* when SFTP is used */ |
| 34 | char **path) /* returns the allocated |
| 35 | real path to work with */ |
| 36 | { |
| 37 | struct Curl_easy *data = conn->data; |
| 38 | char *real_path = NULL; |
| 39 | char *working_path; |
| 40 | size_t working_path_len; |
| 41 | CURLcode result = |
| 42 | Curl_urldecode(data, data->state.path, 0, &working_path, |
| 43 | &working_path_len, FALSE); |
| 44 | if(result) |
| 45 | return result; |
| 46 | |
| 47 | /* Check for /~/, indicating relative to the user's home directory */ |
| 48 | if(conn->handler->protocol & CURLPROTO_SCP) { |
| 49 | real_path = malloc(working_path_len + 1); |
| 50 | if(real_path == NULL) { |
| 51 | free(working_path); |
| 52 | return CURLE_OUT_OF_MEMORY; |
| 53 | } |
| 54 | if((working_path_len > 3) && (!memcmp(working_path, "/~/", 3))) |
| 55 | /* It is referenced to the home directory, so strip the leading '/~/' */ |
| 56 | memcpy(real_path, working_path + 3, 4 + working_path_len-3); |
| 57 | else |
| 58 | memcpy(real_path, working_path, 1 + working_path_len); |
| 59 | } |
| 60 | else if(conn->handler->protocol & CURLPROTO_SFTP) { |
| 61 | if((working_path_len > 1) && (working_path[1] == '~')) { |
| 62 | size_t homelen = strlen(homedir); |
| 63 | real_path = malloc(homelen + working_path_len + 1); |
| 64 | if(real_path == NULL) { |
| 65 | free(working_path); |
| 66 | return CURLE_OUT_OF_MEMORY; |
| 67 | } |
| 68 | /* It is referenced to the home directory, so strip the |
| 69 | leading '/' */ |
| 70 | memcpy(real_path, homedir, homelen); |
| 71 | real_path[homelen] = '/'; |
| 72 | real_path[homelen + 1] = '\0'; |
| 73 | if(working_path_len > 3) { |
| 74 | memcpy(real_path + homelen + 1, working_path + 3, |
| 75 | 1 + working_path_len -3); |
| 76 | } |
| 77 | } |
| 78 | else { |
| 79 | real_path = malloc(working_path_len + 1); |
| 80 | if(real_path == NULL) { |
| 81 | free(working_path); |
| 82 | return CURLE_OUT_OF_MEMORY; |
| 83 | } |
| 84 | memcpy(real_path, working_path, 1 + working_path_len); |
| 85 | } |
| 86 | } |
| 87 | |
| 88 | free(working_path); |
| 89 | |
| 90 | /* store the pointer for the caller to receive */ |
| 91 | *path = real_path; |
| 92 | |
| 93 | return CURLE_OK; |
| 94 | } |
| 95 | |
| 96 | /* The get_pathname() function is being borrowed from OpenSSH sftp.c |
| 97 | version 4.6p1. */ |
| 98 | /* |
| 99 | * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org> |
| 100 | * |
| 101 | * Permission to use, copy, modify, and distribute this software for any |
| 102 | * purpose with or without fee is hereby granted, provided that the above |
| 103 | * copyright notice and this permission notice appear in all copies. |
| 104 | * |
| 105 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| 106 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| 107 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| 108 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 109 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 110 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| 111 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 112 | */ |
| 113 | CURLcode Curl_get_pathname(const char **cpp, char **path, char *homedir) |
| 114 | { |
| 115 | const char *cp = *cpp, *end; |
| 116 | char quot; |
| 117 | unsigned int i, j; |
| 118 | size_t fullPathLength, pathLength; |
| 119 | bool relativePath = false; |
| 120 | static const char WHITESPACE[] = " \t\r\n"; |
| 121 | |
| 122 | if(!*cp) { |
| 123 | *cpp = NULL; |
| 124 | *path = NULL; |
| 125 | return CURLE_QUOTE_ERROR; |
| 126 | } |
| 127 | /* Ignore leading whitespace */ |
| 128 | cp += strspn(cp, WHITESPACE); |
| 129 | /* Allocate enough space for home directory and filename + separator */ |
| 130 | fullPathLength = strlen(cp) + strlen(homedir) + 2; |
| 131 | *path = malloc(fullPathLength); |
| 132 | if(*path == NULL) |
| 133 | return CURLE_OUT_OF_MEMORY; |
| 134 | |
| 135 | /* Check for quoted filenames */ |
| 136 | if(*cp == '\"' || *cp == '\'') { |
| 137 | quot = *cp++; |
| 138 | |
| 139 | /* Search for terminating quote, unescape some chars */ |
| 140 | for(i = j = 0; i <= strlen(cp); i++) { |
| 141 | if(cp[i] == quot) { /* Found quote */ |
| 142 | i++; |
| 143 | (*path)[j] = '\0'; |
| 144 | break; |
| 145 | } |
| 146 | if(cp[i] == '\0') { /* End of string */ |
| 147 | /*error("Unterminated quote");*/ |
| 148 | goto fail; |
| 149 | } |
| 150 | if(cp[i] == '\\') { /* Escaped characters */ |
| 151 | i++; |
| 152 | if(cp[i] != '\'' && cp[i] != '\"' && |
| 153 | cp[i] != '\\') { |
| 154 | /*error("Bad escaped character '\\%c'", |
| 155 | cp[i]);*/ |
| 156 | goto fail; |
| 157 | } |
| 158 | } |
| 159 | (*path)[j++] = cp[i]; |
| 160 | } |
| 161 | |
| 162 | if(j == 0) { |
| 163 | /*error("Empty quotes");*/ |
| 164 | goto fail; |
| 165 | } |
| 166 | *cpp = cp + i + strspn(cp + i, WHITESPACE); |
| 167 | } |
| 168 | else { |
| 169 | /* Read to end of filename - either to white space or terminator */ |
| 170 | end = strpbrk(cp, WHITESPACE); |
| 171 | if(end == NULL) |
| 172 | end = strchr(cp, '\0'); |
| 173 | /* return pointer to second parameter if it exists */ |
| 174 | *cpp = end + strspn(end, WHITESPACE); |
| 175 | pathLength = 0; |
| 176 | relativePath = (cp[0] == '/' && cp[1] == '~' && cp[2] == '/'); |
| 177 | /* Handling for relative path - prepend home directory */ |
| 178 | if(relativePath) { |
| 179 | strcpy(*path, homedir); |
| 180 | pathLength = strlen(homedir); |
| 181 | (*path)[pathLength++] = '/'; |
| 182 | (*path)[pathLength] = '\0'; |
| 183 | cp += 3; |
| 184 | } |
| 185 | /* Copy path name up until first "white space" */ |
| 186 | memcpy(&(*path)[pathLength], cp, (int)(end - cp)); |
| 187 | pathLength += (int)(end - cp); |
| 188 | (*path)[pathLength] = '\0'; |
| 189 | } |
| 190 | return CURLE_OK; |
| 191 | |
| 192 | fail: |
| 193 | Curl_safefree(*path); |
| 194 | return CURLE_QUOTE_ERROR; |
| 195 | } |