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/***************************************************************************
* _ _ ____ _
* 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 "curl_path.h"
#include <curl/curl.h>
#include "../curlx/strparse.h"
#include "../curl_memory.h"
#include "../escape.h"
#include "../memdebug.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)) {
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)) {
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)) {
free(working_path);
return CURLE_OUT_OF_MEMORY;
}
}
else {
if(curlx_dyn_add(&npath, "/")) {
free(working_path);
return CURLE_OUT_OF_MEMORY;
}
}
}
if(curlx_dyn_len(&npath)) {
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;
}
#endif /* if SSH is used */
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