119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
/* Copyright (C) 2009 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* manage paths relative to a root directory
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*/
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#include "precompiled.h"
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#include "path.h"
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#include <string.h>
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#include "lib/posix/posix_filesystem.h"
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#include "lib/sysdep/sysdep.h" // SYS_DIR_SEP
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#include "lib/path_util.h" // ERR::PATH_LENGTH
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ERROR_ASSOCIATE(ERR::PATH_ROOT_DIR_ALREADY_SET, "Attempting to set FS root dir more than once", -1);
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ERROR_ASSOCIATE(ERR::PATH_NOT_IN_ROOT_DIR, "Accessing a file that's outside of the root dir", -1);
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bool exists(const Path& path)
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{
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return fs::exists(path.external_directory_string());
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}
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// security check: only allow path_SetRoot once so that malicious code
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// cannot circumvent the VFS checks that disallow access to anything above
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// the current directory (set here).
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// path_SetRoot is called early at startup, so any subsequent attempts
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// are likely bogus.
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// we provide for resetting this from the self-test to allow clean
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// re-init of the individual tests.
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static bool s_isRootPathEstablished;
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static std::string s_rootPath;
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/*static*/ PathTraits::external_string_type PathTraits::to_external(const Path&, const PathTraits::internal_string_type& src)
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{
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std::string absolutePath = s_rootPath + src;
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std::replace(absolutePath.begin(), absolutePath.end(), '/', SYS_DIR_SEP);
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return absolutePath;
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}
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/*static*/ PathTraits::internal_string_type PathTraits::to_internal(const PathTraits::external_string_type& src)
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{
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if(s_rootPath.compare(0, s_rootPath.length(), src) != 0)
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DEBUG_WARN_ERR(ERR::PATH_NOT_IN_ROOT_DIR);
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std::string relativePath = src.substr(s_rootPath.length(), src.length()-s_rootPath.length());
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std::replace(relativePath.begin(), relativePath.end(), SYS_DIR_SEP, '/');
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return relativePath;
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}
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LibError path_SetRoot(const char* argv0, const char* relativePath)
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{
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if(s_isRootPathEstablished)
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WARN_RETURN(ERR::PATH_ROOT_DIR_ALREADY_SET);
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s_isRootPathEstablished = true;
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// get full path to executable
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char osPathname[PATH_MAX];
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// .. first try safe, but system-dependent version
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if(sys_get_executable_name(osPathname, PATH_MAX) < 0)
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{
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// .. failed; use argv[0]
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errno = 0;
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if(!realpath(argv0, osPathname))
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return LibError_from_errno();
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}
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// make sure it's valid
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errno = 0;
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if(access(osPathname, X_OK) < 0)
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return LibError_from_errno();
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// strip executable name
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char* name = (char*)path_name_only(osPathname);
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*name = '\0';
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strcat_s(osPathname, PATH_MAX, relativePath);
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// get actual root dir - previous osPathname may include ".."
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// (slight optimization, speeds up path lookup)
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errno = 0;
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char osRootPath[PATH_MAX];
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if(!realpath(osPathname, osRootPath))
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return LibError_from_errno();
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s_rootPath = osRootPath;
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s_rootPath.append(1, SYS_DIR_SEP); // simplifies to_external
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return INFO::OK;
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}
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void path_ResetRootDir()
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{
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debug_assert(s_isRootPathEstablished); // see comment at s_isRootPathEstablished.
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s_rootPath.clear();
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s_isRootPathEstablished = false;
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}
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