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/*
* Copyright (C) 2019 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.
*/
#define LOG_TAG "packagelistparser"
#include <packagelistparser/packagelistparser.h>
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <sys/limits.h>
#include <memory>
#include <log/log.h>
static bool parse_gids(const char* path, size_t line_number, const char* gids, pkg_info* info) {
// Nothing to do?
if (!gids || !strcmp(gids, "none")) return true;
// How much space do we need?
info->gids.cnt = 1;
for (const char* p = gids; *p; ++p) {
if (*p == ',') ++info->gids.cnt;
}
// Allocate the space.
info->gids.gids = new gid_t[info->gids.cnt];
if (!info->gids.gids) return false;
// And parse the individual gids.
size_t i = 0;
while (true) {
char* end;
unsigned long gid = strtoul(gids, &end, 10);
if (gid > GID_MAX) {
ALOGE("%s:%zu: gid %lu > GID_MAX", path, line_number, gid);
return false;
}
if (i >= info->gids.cnt) return false;
info->gids.gids[i++] = gid;
if (*end == '\0') return true;
if (*end != ',') return false;
gids = end + 1;
}
return true;
}
static bool parse_line(const char* path, size_t line_number, const char* line, pkg_info* info) {
int debuggable;
char* gid_list;
int profileable_from_shell = 0;
int fields =
sscanf(line, "%ms %u %d %ms %ms %ms %d %ld", &info->name, &info->uid,
&debuggable, &info->data_dir, &info->seinfo, &gid_list,
&profileable_from_shell, &info->version_code);
// Handle the more complicated gids field and free the temporary string.
bool gids_okay = parse_gids(path, line_number, gid_list, info);
free(gid_list);
if (!gids_okay) return false;
// Did we see enough fields to be getting on with?
// The final fields are optional (and not usually present).
if (fields < 6) {
ALOGE("%s:%zu: too few fields in line", path, line_number);
return false;
}
// Convert integers to bools.
info->debuggable = debuggable;
info->profileable_from_shell = profileable_from_shell;
return true;
}
bool packagelist_parse_file(const char* path, bool (*callback)(pkg_info*, void*), void* user_data) {
std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(path, "re"), &fclose);
if (!fp) {
ALOGE("couldn't open '%s': %s", path, strerror(errno));
return false;
}
size_t line_number = 0;
char* line = nullptr;
size_t allocated_length = 0;
while (getline(&line, &allocated_length, fp.get()) > 0) {
++line_number;
std::unique_ptr<pkg_info, decltype(&packagelist_free)> info(
static_cast<pkg_info*>(calloc(1, sizeof(pkg_info))), &packagelist_free);
if (!info) {
ALOGE("%s:%zu: couldn't allocate pkg_info", path, line_number);
return false;
}
if (!parse_line(path, line_number, line, info.get())) return false;
if (!callback(info.release(), user_data)) break;
}
free(line);
return true;
}
bool packagelist_parse(bool (*callback)(pkg_info*, void*), void* user_data) {
return packagelist_parse_file("/data/system/packages.list", callback, user_data);
}
void packagelist_free(pkg_info* info) {
if (!info) return;
free(info->name);
free(info->data_dir);
free(info->seinfo);
delete[] info->gids.gids;
free(info);
}
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