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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "linker_utils.h"
#include "linker_debug.h"
#include "linker_globals.h"
#include "android-base/strings.h"
#include <sys/stat.h>
#include <unistd.h>
std::string dirname(const char* path) {
const char* last_slash = strrchr(path, '/');
if (last_slash == path) {
return "/";
} else if (last_slash == nullptr) {
return ".";
} else {
return std::string(path, last_slash - path);
}
}
bool normalize_path(const char* path, std::string* normalized_path) {
// Input should be an absolute path
if (path[0] != '/') {
PRINT("normalize_path - invalid input: \"%s\", the input path should be absolute", path);
return false;
}
const size_t len = strlen(path) + 1;
char buf[len];
const char* in_ptr = path;
char* out_ptr = buf;
while (*in_ptr != 0) {
if (*in_ptr == '/') {
char c1 = in_ptr[1];
if (c1 == '.') {
char c2 = in_ptr[2];
if (c2 == '/') {
in_ptr += 2;
continue;
} else if (c2 == '.' && (in_ptr[3] == '/' || in_ptr[3] == 0)) {
in_ptr += 3;
while (out_ptr > buf && *--out_ptr != '/') {
}
if (in_ptr[0] == 0) {
// retain '/'
out_ptr++;
}
continue;
}
} else if (c1 == '/') {
++in_ptr;
continue;
}
}
*out_ptr++ = *in_ptr++;
}
*out_ptr = 0;
*normalized_path = buf;
return true;
}
bool file_is_in_dir(const std::string& file, const std::string& dir) {
const char* needle = dir.c_str();
const char* haystack = file.c_str();
size_t needle_len = strlen(needle);
return strncmp(haystack, needle, needle_len) == 0 &&
haystack[needle_len] == '/' &&
strchr(haystack + needle_len + 1, '/') == nullptr;
}
bool file_is_under_dir(const std::string& file, const std::string& dir) {
const char* needle = dir.c_str();
const char* haystack = file.c_str();
size_t needle_len = strlen(needle);
return strncmp(haystack, needle, needle_len) == 0 &&
haystack[needle_len] == '/';
}
const char* const kZipFileSeparator = "!/";
bool parse_zip_path(const char* input_path, std::string* zip_path, std::string* entry_path) {
std::string normalized_path;
if (!normalize_path(input_path, &normalized_path)) {
return false;
}
const char* const path = normalized_path.c_str();
TRACE("Trying zip file open from path \"%s\" -> normalized \"%s\"", input_path, path);
// Treat an '!/' separator inside a path as the separator between the name
// of the zip file on disk and the subdirectory to search within it.
// For example, if path is "foo.zip!/bar/bas/x.so", then we search for
// "bar/bas/x.so" within "foo.zip".
const char* const separator = strstr(path, kZipFileSeparator);
if (separator == nullptr) {
return false;
}
char buf[512];
if (strlcpy(buf, path, sizeof(buf)) >= sizeof(buf)) {
PRINT("Warning: ignoring very long library path: %s", path);
return false;
}
buf[separator - path] = '\0';
*zip_path = buf;
*entry_path = &buf[separator - path + 2];
return true;
}
constexpr off64_t kPageMask = ~static_cast<off64_t>(PAGE_SIZE-1);
off64_t page_start(off64_t offset) {
return offset & kPageMask;
}
bool safe_add(off64_t* out, off64_t a, size_t b) {
CHECK(a >= 0);
if (static_cast<uint64_t>(INT64_MAX - a) < b) {
return false;
}
*out = a + b;
return true;
}
size_t page_offset(off64_t offset) {
return static_cast<size_t>(offset & (PAGE_SIZE-1));
}
void split_path(const char* path, const char* delimiters,
std::vector<std::string>* paths) {
if (path != nullptr && path[0] != 0) {
*paths = android::base::Split(path, delimiters);
}
}
void resolve_paths(std::vector<std::string>& paths,
std::vector<std::string>* resolved_paths) {
resolved_paths->clear();
for (const auto& path : paths) {
char resolved_path[PATH_MAX];
const char* original_path = path.c_str();
if (realpath(original_path, resolved_path) != nullptr) {
struct stat s;
if (stat(resolved_path, &s) == 0) {
if (S_ISDIR(s.st_mode)) {
resolved_paths->push_back(resolved_path);
} else {
DL_WARN("Warning: \"%s\" is not a directory (excluding from path)", resolved_path);
continue;
}
} else {
DL_WARN("Warning: cannot stat file \"%s\": %s", resolved_path, strerror(errno));
continue;
}
} else {
std::string zip_path;
std::string entry_path;
std::string normalized_path;
if (!normalize_path(original_path, &normalized_path)) {
DL_WARN("Warning: unable to normalize \"%s\"", original_path);
continue;
}
if (parse_zip_path(normalized_path.c_str(), &zip_path, &entry_path)) {
if (realpath(zip_path.c_str(), resolved_path) == nullptr) {
DL_WARN("Warning: unable to resolve \"%s\": %s", zip_path.c_str(), strerror(errno));
continue;
}
resolved_paths->push_back(std::string(resolved_path) + kZipFileSeparator + entry_path);
}
}
}
}
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