1 /*
2 * Copyright (C) 2018 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 <sys/wait.h>
18
19 #include <android-base/cmsg.h>
20 #include <android-base/strings.h>
21 #include <cmd.h>
22
23 #include "adb.h"
24 #include "adb_io.h"
25 #include "adb_utils.h"
26 #include "shell_service.h"
27 #include "sysdeps.h"
28
29 namespace {
30
31 class AdbFdTextOutput : public android::TextOutput {
32 public:
AdbFdTextOutput(borrowed_fd fd)33 explicit AdbFdTextOutput(borrowed_fd fd) : fd_(fd) {}
34
35 private:
print(const char * txt,size_t len)36 android::status_t print(const char* txt, size_t len) override {
37 return WriteFdExactly(fd_, txt, len) ? android::OK : -errno;
38 }
moveIndent(int delta)39 void moveIndent(int delta) override { /*not implemented*/
40 }
41
pushBundle()42 void pushBundle() override { /*not implemented*/
43 }
popBundle()44 void popBundle() override { /*not implemented*/
45 }
46
47 private:
48 borrowed_fd fd_;
49 };
50
parseCmdArgs(std::string_view args)51 std::vector<std::string_view> parseCmdArgs(std::string_view args) {
52 std::vector<std::string_view> argv;
53
54 char delim = ABB_ARG_DELIMETER;
55 size_t size = args.size();
56 size_t base = 0;
57 while (base < size) {
58 size_t found;
59 for (found = base; found < size && args[found] && args[found] != delim; ++found)
60 ;
61 if (found > base) {
62 argv.emplace_back(args.substr(base, found - base));
63 }
64 base = found + 1;
65 }
66
67 return argv;
68 }
69
70 } // namespace
71
execCmd(std::string_view args,borrowed_fd in,borrowed_fd out,borrowed_fd err)72 static int execCmd(std::string_view args, borrowed_fd in, borrowed_fd out, borrowed_fd err) {
73 int max_buf = LINUX_MAX_SOCKET_SIZE;
74 adb_setsockopt(in, SOL_SOCKET, SO_SNDBUF, &max_buf, sizeof(max_buf));
75 adb_setsockopt(out, SOL_SOCKET, SO_SNDBUF, &max_buf, sizeof(max_buf));
76 adb_setsockopt(err, SOL_SOCKET, SO_SNDBUF, &max_buf, sizeof(max_buf));
77
78 AdbFdTextOutput oin(out);
79 AdbFdTextOutput oerr(err);
80 return cmdMain(parseCmdArgs(args), oin, oerr, in.get(), out.get(), err.get(),
81 RunMode::kLibrary);
82 }
83
main(int argc,char * const argv[])84 int main(int argc, char* const argv[]) {
85 signal(SIGPIPE, SIG_IGN);
86
87 int fd = STDIN_FILENO;
88 std::string data;
89 while (true) {
90 std::string error;
91 if (!ReadProtocolString(fd, &data, &error)) {
92 PLOG(ERROR) << "Failed to read message: " << error;
93 break;
94 }
95
96 std::string_view name = data;
97 auto protocol = SubprocessProtocol::kShell;
98 if (android::base::ConsumePrefix(&name, "abb:")) {
99 protocol = SubprocessProtocol::kShell;
100 } else if (android::base::ConsumePrefix(&name, "abb_exec:")) {
101 protocol = SubprocessProtocol::kNone;
102 } else {
103 LOG(FATAL) << "Unknown command prefix for abb: " << data;
104 }
105
106 unique_fd result = StartCommandInProcess(std::string(name), &execCmd, protocol);
107 int max_buf = LINUX_MAX_SOCKET_SIZE;
108 adb_setsockopt(result, SOL_SOCKET, SO_SNDBUF, &max_buf, sizeof(max_buf));
109 if (android::base::SendFileDescriptors(fd, "", 1, result.get()) != 1) {
110 PLOG(ERROR) << "Failed to send an inprocess fd for command: " << data;
111 break;
112 }
113 }
114 }
115