1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18 #include <stdlib.h>
19 #include <unistd.h>
20 #include <string.h>
21 #include <signal.h>
22 #include <errno.h>
23 #include <fcntl.h>
24 #include <stdlib.h>
25 #include <poll.h>
26
27 #include <sys/socket.h>
28 #include <sys/select.h>
29 #include <sys/time.h>
30 #include <sys/types.h>
31 #include <sys/un.h>
32
33 #include <android-base/logging.h>
34 #include <android-base/stringprintf.h>
35
36 #include <cutils/sockets.h>
37 #include <private/android_filesystem_config.h>
38
39 static void usage(char *progname);
40 static int do_monitor(int sock, int stop_after_cmd);
41 static int do_cmd(int sock, int argc, char **argv);
42
43 static constexpr int kCommandTimeoutMs = 20 * 1000;
44
main(int argc,char ** argv)45 int main(int argc, char **argv) {
46 int sock;
47 int wait_for_socket;
48 char *progname;
49
50 progname = argv[0];
51
52 if (getppid() == 1) {
53 // If init is calling us then it's during boot and we should log to kmsg
54 android::base::InitLogging(argv, &android::base::KernelLogger);
55 } else {
56 android::base::InitLogging(argv, &android::base::StderrLogger);
57 }
58
59 wait_for_socket = argc > 1 && strcmp(argv[1], "--wait") == 0;
60 if (wait_for_socket) {
61 argv++;
62 argc--;
63 }
64
65 if (argc < 2) {
66 usage(progname);
67 exit(5);
68 }
69
70 const char* sockname = "vold";
71 if (!strcmp(argv[1], "cryptfs")) {
72 sockname = "cryptd";
73 }
74
75 while ((sock = socket_local_client(sockname,
76 ANDROID_SOCKET_NAMESPACE_RESERVED,
77 SOCK_STREAM)) < 0) {
78 if (!wait_for_socket) {
79 PLOG(ERROR) << "Error connecting to " << sockname;
80 exit(4);
81 } else {
82 usleep(10000);
83 }
84 }
85
86 if (!strcmp(argv[1], "monitor")) {
87 exit(do_monitor(sock, 0));
88 } else {
89 exit(do_cmd(sock, argc, argv));
90 }
91 }
92
do_cmd(int sock,int argc,char ** argv)93 static int do_cmd(int sock, int argc, char **argv) {
94 int seq = getpid();
95
96 std::string cmd(android::base::StringPrintf("%d ", seq));
97 for (int i = 1; i < argc; i++) {
98 if (!strchr(argv[i], ' ')) {
99 cmd.append(argv[i]);
100 } else {
101 cmd.push_back('\"');
102 cmd.append(argv[i]);
103 cmd.push_back('\"');
104 }
105
106 if (i < argc - 1) {
107 cmd.push_back(' ');
108 }
109 }
110
111 if (TEMP_FAILURE_RETRY(write(sock, cmd.c_str(), cmd.length() + 1)) < 0) {
112 PLOG(ERROR) << "Failed to write command";
113 return errno;
114 }
115
116 return do_monitor(sock, seq);
117 }
118
do_monitor(int sock,int stop_after_seq)119 static int do_monitor(int sock, int stop_after_seq) {
120 char buffer[4096];
121 int timeout = kCommandTimeoutMs;
122
123 if (stop_after_seq == 0) {
124 LOG(INFO) << "Connected to vold";
125 timeout = -1;
126 }
127
128 while (1) {
129 struct pollfd poll_sock = { sock, POLLIN, 0 };
130 int rc = TEMP_FAILURE_RETRY(poll(&poll_sock, 1, timeout));
131 if (rc == 0) {
132 LOG(ERROR) << "Timeout waiting for " << stop_after_seq;
133 return ETIMEDOUT;
134 } else if (rc < 0) {
135 PLOG(ERROR) << "Failed during poll";
136 return errno;
137 }
138
139 if (!(poll_sock.revents & POLLIN)) {
140 LOG(INFO) << "No data; trying again";
141 continue;
142 }
143
144 memset(buffer, 0, sizeof(buffer));
145 rc = TEMP_FAILURE_RETRY(read(sock, buffer, sizeof(buffer)));
146 if (rc == 0) {
147 LOG(ERROR) << "Lost connection, did vold crash?";
148 return ECONNRESET;
149 } else if (rc < 0) {
150 PLOG(ERROR) << "Error reading data";
151 return errno;
152 }
153
154 int offset = 0;
155 for (int i = 0; i < rc; i++) {
156 if (buffer[i] == '\0') {
157 char* res = buffer + offset;
158 fprintf(stdout, "%s\n", res);
159
160 int code = atoi(strtok(res, " "));
161 if (code >= 200 && code < 600) {
162 int seq = atoi(strtok(nullptr, " "));
163 if (seq == stop_after_seq) {
164 if (code == 200) {
165 return 0;
166 } else {
167 return code;
168 }
169 }
170 }
171
172 offset = i + 1;
173 }
174 }
175 }
176 return EIO;
177 }
178
usage(char * progname)179 static void usage(char *progname) {
180 LOG(INFO) << "Usage: " << progname << " [--wait] <monitor>|<cmd> [arg1] [arg2...]";
181 }
182