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/*
* Copyright (C) 2008 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <poll.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/un.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <cutils/sockets.h>
#include <private/android_filesystem_config.h>
static void usage(char *progname);
static int do_monitor(int sock, int stop_after_cmd);
static int do_cmd(int sock, int argc, char **argv);
static constexpr int kCommandTimeoutMs = 20 * 1000;
int main(int argc, char **argv) {
int sock;
int wait_for_socket;
char *progname;
progname = argv[0];
if (getppid() == 1) {
// If init is calling us then it's during boot and we should log to kmsg
android::base::InitLogging(argv, &android::base::KernelLogger);
} else {
android::base::InitLogging(argv, &android::base::StderrLogger);
}
wait_for_socket = argc > 1 && strcmp(argv[1], "--wait") == 0;
if (wait_for_socket) {
argv++;
argc--;
}
if (argc < 2) {
usage(progname);
exit(5);
}
const char* sockname = "vold";
if (!strcmp(argv[1], "cryptfs")) {
sockname = "cryptd";
}
while ((sock = socket_local_client(sockname,
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_STREAM)) < 0) {
if (!wait_for_socket) {
PLOG(ERROR) << "Error connecting to " << sockname;
exit(4);
} else {
usleep(10000);
}
}
if (!strcmp(argv[1], "monitor")) {
exit(do_monitor(sock, 0));
} else {
exit(do_cmd(sock, argc, argv));
}
}
static int do_cmd(int sock, int argc, char **argv) {
int seq = getpid();
std::string cmd(android::base::StringPrintf("%d ", seq));
for (int i = 1; i < argc; i++) {
if (!strchr(argv[i], ' ')) {
cmd.append(argv[i]);
} else {
cmd.push_back('\"');
cmd.append(argv[i]);
cmd.push_back('\"');
}
if (i < argc - 1) {
cmd.push_back(' ');
}
}
if (TEMP_FAILURE_RETRY(write(sock, cmd.c_str(), cmd.length() + 1)) < 0) {
PLOG(ERROR) << "Failed to write command";
return errno;
}
return do_monitor(sock, seq);
}
static int do_monitor(int sock, int stop_after_seq) {
char buffer[4096];
int timeout = kCommandTimeoutMs;
if (stop_after_seq == 0) {
LOG(INFO) << "Connected to vold";
timeout = -1;
}
while (1) {
struct pollfd poll_sock = { sock, POLLIN, 0 };
int rc = TEMP_FAILURE_RETRY(poll(&poll_sock, 1, timeout));
if (rc == 0) {
LOG(ERROR) << "Timeout waiting for " << stop_after_seq;
return ETIMEDOUT;
} else if (rc < 0) {
PLOG(ERROR) << "Failed during poll";
return errno;
}
if (!(poll_sock.revents & POLLIN)) {
LOG(INFO) << "No data; trying again";
continue;
}
memset(buffer, 0, sizeof(buffer));
rc = TEMP_FAILURE_RETRY(read(sock, buffer, sizeof(buffer)));
if (rc == 0) {
LOG(ERROR) << "Lost connection, did vold crash?";
return ECONNRESET;
} else if (rc < 0) {
PLOG(ERROR) << "Error reading data";
return errno;
}
int offset = 0;
for (int i = 0; i < rc; i++) {
if (buffer[i] == '\0') {
char* res = buffer + offset;
fprintf(stdout, "%s\n", res);
int code = atoi(strtok(res, " "));
if (code >= 200 && code < 600) {
int seq = atoi(strtok(nullptr, " "));
if (seq == stop_after_seq) {
if (code == 200) {
return 0;
} else {
return code;
}
}
}
offset = i + 1;
}
}
}
return EIO;
}
static void usage(char *progname) {
LOG(INFO) << "Usage: " << progname << " [--wait] <monitor>|<cmd> [arg1] [arg2...]";
}
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