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/*
* Phusion Passenger - https://www.phusionpassenger.com/
* Copyright (c) 2010-2018 Phusion Holding B.V.
*
* "Passenger", "Phusion Passenger" and "Union Station" are registered
* trademarks of Phusion Holding B.V.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <sys/param.h>
#include <stdlib.h>
#include <unistd.h>
#include <limits.h>
#include <libgen.h>
#ifdef __has_include
#if __has_include(<filesystem>)
#include <filesystem>
#endif
#endif
#include <vector>
#include <cerrno>
#include <cstring>
#include <FileTools/PathManip.h>
#include <Exceptions.h>
#include <StrIntTools/StrIntUtils.h>
namespace Passenger {
using namespace std;
string
canonicalizePath(const string &path) {
#ifdef __GLIBC__
// We're using a GNU extension here. See the 'BUGS'
// section of the realpath(3) Linux manpage for
// rationale.
char *tmp = realpath(path.c_str(), NULL);
if (tmp == NULL) {
int e = errno;
string message;
message = "Cannot resolve the path '";
message.append(path);
message.append("'");
throw FileSystemException(message, e, path);
} else {
string result(tmp);
free(tmp);
return result;
}
#else
char tmp[PATH_MAX];
if (realpath(path.c_str(), tmp) == NULL) {
int e = errno;
string message;
message = "Cannot resolve the path '";
message.append(path);
message.append("'");
throw FileSystemException(message, e, path);
} else {
return tmp;
}
#endif
}
string
absolutizePath(const StaticString &path, const StaticString &workingDir) {
vector<string> components;
if (!startsWith(path, "/")) {
if (workingDir.empty()) {
char buffer[PATH_MAX + 1];
if (getcwd(buffer, PATH_MAX) == NULL) {
int e = errno;
throw SystemException("Unable to query current working directory", e);
}
buffer[PATH_MAX] = '\0';
split(buffer + 1, '/', components);
} else {
string absoluteWorkingDir = absolutizePath(workingDir);
split(StaticString(absoluteWorkingDir.data() + 1, absoluteWorkingDir.size() - 1),
'/', components);
}
}
const char *begin = path.data();
const char *end = path.data() + path.size();
// Skip leading slashes.
while (begin < end && *begin == '/') {
begin++;
}
while (begin < end) {
const char *next = (const char *) memchr(begin, '/', end - begin);
if (next == NULL) {
next = end;
}
StaticString component(begin, next - begin);
if (component == "..") {
if (!components.empty()) {
components.pop_back();
}
} else if (component != ".") {
components.push_back(component);
}
// Skip slashes until beginning of next path component.
begin = next + 1;
while (begin < end && *begin == '/') {
begin++;
}
}
string result;
vector<string>::const_iterator c_it, c_end = components.end();
for (c_it = components.begin(); c_it != c_end; c_it++) {
result.append("/");
result.append(*c_it);
}
if (result.empty()) {
result = "/";
}
return result;
}
string
resolveSymlink(const StaticString &path) {
string pathNt(path.data(), path.size());
char buf[PATH_MAX];
ssize_t size;
size = readlink(pathNt.c_str(), buf, sizeof(buf) - 1);
if (size == -1) {
if (errno == EINVAL) {
return pathNt;
} else {
int e = errno;
string message = "Cannot resolve possible symlink '";
message.append(path.data(), path.size());
message.append("'");
throw FileSystemException(message, e, pathNt);
}
} else {
buf[size] = '\0';
if (buf[0] == '\0') {
string message = "The file '";
message.append(path.data(), path.size());
message.append("' is a symlink, and it refers to an empty filename. This is not allowed.");
throw FileSystemException(message, ENOENT, pathNt);
} else if (buf[0] == '/') {
// Symlink points to an absolute path.
return buf;
} else {
return extractDirNameStatic(path) + "/" + buf;
}
}
}
string
extractDirName(const StaticString &path) {
DynamicBuffer pathCopy(path.size() + 1);
memcpy(pathCopy.data, path.data(), path.size());
pathCopy.data[path.size()] = '\0';
return string(dirname(pathCopy.data));
}
StaticString
extractDirNameStatic(const StaticString &path) {
if (path.empty()) {
return StaticString(".", 1);
}
const char *data = path.data();
const char *end = path.data() + path.size();
// Ignore trailing '/' characters.
while (end > data && end[-1] == '/') {
end--;
}
if (end == data) {
// Apparently the entire path consists of slashes.
return StaticString("/", 1);
}
// Find last '/'.
end--;
while (end > data && *end != '/') {
end--;
}
if (end == data) {
if (*data == '/') {
// '/' found, but it's the first character in the path.
return StaticString("/", 1);
} else {
// No '/' found in path.
return StaticString(".", 1);
}
} else {
// '/' found and it's not the first character in path.
// 'end' points to that '/' character.
// Skip to first non-'/' character.
while (end >= data && *end == '/') {
end--;
}
if (end < data) {
// The entire path consists of '/' characters.
return StaticString("/", 1);
} else {
return StaticString(data, end - data + 1);
}
}
}
string
extractBaseName(const StaticString &path) {
#if defined(_LIBCPP_FILESYSTEM) && _LIBCPP_STD_VER > 14
return filesystem::path(path).filename();
#else
DynamicBuffer pathNt(path.size() + 1);
memcpy(pathNt.data, path.data(), path.size());
pathNt.data[path.size()] = '\0';
string result = basename(pathNt.data);
return result;
#endif
}
} // namespace Passenger
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