| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 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.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. |
| * |
| * SPDX-License-Identifier: curl AND ISC |
| * |
| ***************************************************************************/ |
| #include "../curl_setup.h" |
| |
| #ifdef USE_SSH |
| |
| #include "vssh.h" |
| #include "../curlx/strparse.h" |
| #include "../curl_trc.h" |
| #include "../escape.h" |
| |
| #define MAX_SSHPATH_LEN 100000 /* arbitrary */ |
| |
| /* figure out the path to work with in this particular request */ |
| CURLcode Curl_getworkingpath(struct Curl_easy *data, |
| char *homedir, /* when SFTP is used */ |
| char **path) /* returns the allocated |
| real path to work with */ |
| { |
| char *working_path; |
| size_t working_path_len; |
| struct dynbuf npath; |
| CURLcode result = |
| Curl_urldecode(data->state.up.path, 0, &working_path, |
| &working_path_len, REJECT_ZERO); |
| if(result) |
| return result; |
| |
| /* new path to switch to in case we need to */ |
| curlx_dyn_init(&npath, MAX_SSHPATH_LEN); |
| |
| /* Check for /~/, indicating relative to the user's home directory */ |
| if((data->conn->handler->protocol & CURLPROTO_SCP) && |
| (working_path_len > 3) && (!memcmp(working_path, "/~/", 3))) { |
| /* It is referenced to the home directory, so strip the leading '/~/' */ |
| if(curlx_dyn_addn(&npath, &working_path[3], working_path_len - 3)) { |
| curlx_free(working_path); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| else if((data->conn->handler->protocol & CURLPROTO_SFTP) && |
| (!strcmp("/~", working_path) || |
| ((working_path_len > 2) && !memcmp(working_path, "/~/", 3)))) { |
| if(curlx_dyn_add(&npath, homedir)) { |
| curlx_free(working_path); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| if(working_path_len > 2) { |
| size_t len; |
| const char *p; |
| int copyfrom = 3; |
| /* Copy a separating '/' if homedir does not end with one */ |
| len = curlx_dyn_len(&npath); |
| p = curlx_dyn_ptr(&npath); |
| if(len && (p[len - 1] != '/')) |
| copyfrom = 2; |
| |
| if(curlx_dyn_addn(&npath, &working_path[copyfrom], |
| working_path_len - copyfrom)) { |
| curlx_free(working_path); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| else { |
| if(curlx_dyn_add(&npath, "/")) { |
| curlx_free(working_path); |
| return CURLE_OUT_OF_MEMORY; |
| } |
| } |
| } |
| |
| if(curlx_dyn_len(&npath)) { |
| curlx_free(working_path); |
| |
| /* store the pointer for the caller to receive */ |
| *path = curlx_dyn_ptr(&npath); |
| } |
| else |
| *path = working_path; |
| DEBUGASSERT(*path && (*path)[0]); |
| |
| return CURLE_OK; |
| } |
| |
| #define MAX_PATHLENGTH 65535 /* arbitrary long */ |
| |
| CURLcode Curl_get_pathname(const char **cpp, char **path, const char *homedir) |
| { |
| const char *cp = *cpp; |
| struct dynbuf out; |
| CURLcode result; |
| |
| DEBUGASSERT(homedir); |
| *path = NULL; |
| *cpp = NULL; |
| if(!*cp || !homedir) |
| return CURLE_QUOTE_ERROR; |
| |
| curlx_dyn_init(&out, MAX_PATHLENGTH); |
| |
| /* Ignore leading whitespace */ |
| curlx_str_passblanks(&cp); |
| |
| /* Check for quoted filenames */ |
| if(*cp == '\"' || *cp == '\'') { |
| char quot = *cp++; |
| |
| /* Search for terminating quote, unescape some chars */ |
| while(*cp != quot) { |
| if(!*cp) /* End of string */ |
| goto fail; |
| |
| if(*cp == '\\') { /* Escaped characters */ |
| cp++; |
| if(*cp != '\'' && *cp != '\"' && *cp != '\\') |
| goto fail; |
| } |
| result = curlx_dyn_addn(&out, cp, 1); |
| if(result) |
| return result; |
| cp++; |
| } |
| cp++; /* pass the end quote */ |
| |
| if(!curlx_dyn_len(&out)) |
| goto fail; |
| } |
| else { |
| struct Curl_str word; |
| bool content = FALSE; |
| int rc; |
| /* Handling for relative path - prepend home directory */ |
| if(cp[0] == '/' && cp[1] == '~' && cp[2] == '/') { |
| result = curlx_dyn_add(&out, homedir); |
| if(!result) |
| result = curlx_dyn_addn(&out, "/", 1); |
| if(result) |
| return result; |
| cp += 3; |
| content = TRUE; |
| } |
| /* Read to end of filename - either to whitespace or terminator */ |
| rc = curlx_str_word(&cp, &word, MAX_PATHLENGTH); |
| if(rc) { |
| if(rc == STRE_BIG) { |
| curlx_dyn_free(&out); |
| return CURLE_TOO_LARGE; |
| } |
| else if(!content) |
| /* no path, no word, this is incorrect */ |
| goto fail; |
| } |
| else { |
| /* append the word */ |
| result = curlx_dyn_addn(&out, curlx_str(&word), curlx_strlen(&word)); |
| if(result) |
| return result; |
| } |
| } |
| /* skip whitespace */ |
| curlx_str_passblanks(&cp); |
| |
| /* return pointer to second parameter if it exists */ |
| *cpp = cp; |
| |
| *path = curlx_dyn_ptr(&out); |
| return CURLE_OK; |
| |
| fail: |
| curlx_dyn_free(&out); |
| return CURLE_QUOTE_ERROR; |
| } |
| |
| CURLcode Curl_ssh_range(struct Curl_easy *data, |
| const char *p, curl_off_t filesize, |
| curl_off_t *startp, curl_off_t *sizep) |
| { |
| curl_off_t from, to; |
| int to_t; |
| int from_t = curlx_str_number(&p, &from, CURL_OFF_T_MAX); |
| if(from_t == STRE_OVERFLOW) |
| return CURLE_RANGE_ERROR; |
| curlx_str_passblanks(&p); |
| (void)curlx_str_single(&p, '-'); |
| |
| to_t = curlx_str_numblanks(&p, &to); |
| if((to_t == STRE_OVERFLOW) || (to_t && from_t) || *p) |
| return CURLE_RANGE_ERROR; |
| |
| if(from_t) { |
| /* no start point given, set from relative to end of file */ |
| if(!to) |
| /* "-0" is not a fine range */ |
| return CURLE_RANGE_ERROR; |
| else if(to > filesize) |
| to = filesize; |
| from = filesize - to; |
| to = filesize - 1; |
| } |
| else if(from > filesize) { |
| failf(data, "Offset (%" FMT_OFF_T ") was beyond file size (%" |
| FMT_OFF_T ")", from, filesize); |
| return CURLE_RANGE_ERROR; |
| } |
| else if((to_t == STRE_NO_NUM) || (to >= filesize)) |
| to = filesize - 1; |
| |
| if(from > to) { |
| failf(data, "Bad range: start offset larger than end offset"); |
| return CURLE_RANGE_ERROR; |
| } |
| if((to - from) == CURL_OFF_T_MAX) |
| return CURLE_RANGE_ERROR; |
| |
| *startp = from; |
| *sizep = to - from + 1; |
| return CURLE_OK; |
| } |
| |
| #endif /* USE_SSH */ |
