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/*
* Copyright (C) 2016 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 "socket_spec.h"
#include <string>
#include <unordered_map>
#include <vector>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <cutils/sockets.h>
#include "adb.h"
#include "sysdeps.h"
using android::base::StartsWith;
using android::base::StringPrintf;
#if defined(__linux__)
#define ADB_LINUX 1
#else
#define ADB_LINUX 0
#endif
#if defined(_WIN32)
#define ADB_WINDOWS 1
#else
#define ADB_WINDOWS 0
#endif
// Not static because it is used in commandline.c.
int gListenAll = 0;
struct LocalSocketType {
int socket_namespace;
bool available;
};
static auto& kLocalSocketTypes = *new std::unordered_map<std::string, LocalSocketType>({
#if ADB_HOST
{ "local", { ANDROID_SOCKET_NAMESPACE_FILESYSTEM, !ADB_WINDOWS } },
#else
{ "local", { ANDROID_SOCKET_NAMESPACE_RESERVED, !ADB_WINDOWS } },
#endif
{ "localreserved", { ANDROID_SOCKET_NAMESPACE_RESERVED, !ADB_HOST } },
{ "localabstract", { ANDROID_SOCKET_NAMESPACE_ABSTRACT, ADB_LINUX } },
{ "localfilesystem", { ANDROID_SOCKET_NAMESPACE_FILESYSTEM, !ADB_WINDOWS } },
});
static bool parse_tcp_spec(const std::string& spec, std::string* hostname, int* port,
std::string* error) {
std::vector<std::string> fragments = android::base::Split(spec, ":");
if (fragments.size() == 1 || fragments.size() > 3) {
*error = StringPrintf("invalid tcp specification: '%s'", spec.c_str());
return false;
}
if (fragments[0] != "tcp") {
*error = StringPrintf("specification is not tcp: '%s'", spec.c_str());
return false;
}
// strtol accepts leading whitespace.
const std::string& port_str = fragments.back();
if (port_str.empty() || port_str[0] < '0' || port_str[0] > '9') {
*error = StringPrintf("invalid port '%s'", port_str.c_str());
return false;
}
char* parsed_end;
long parsed_port = strtol(port_str.c_str(), &parsed_end, 10);
if (*parsed_end != '\0') {
*error = StringPrintf("trailing chars in port: '%s'", port_str.c_str());
return false;
}
if (parsed_port > 65535) {
*error = StringPrintf("invalid port %ld", parsed_port);
return false;
}
// tcp:123 is valid, tcp::123 isn't.
if (fragments.size() == 2) {
// Empty hostname.
if (hostname) {
*hostname = "";
}
} else {
if (fragments[1].empty()) {
*error = StringPrintf("empty host in '%s'", spec.c_str());
return false;
}
if (hostname) {
*hostname = fragments[1];
}
}
if (port) {
*port = parsed_port;
}
return true;
}
static bool tcp_host_is_local(const std::string& hostname) {
// FIXME
return hostname.empty() || hostname == "localhost";
}
bool is_socket_spec(const std::string& spec) {
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (StartsWith(spec, prefix.c_str())) {
return true;
}
}
return StartsWith(spec, "tcp:");
}
int socket_spec_connect(const std::string& spec, std::string* error) {
if (StartsWith(spec, "tcp:")) {
std::string hostname;
int port;
if (!parse_tcp_spec(spec, &hostname, &port, error)) {
return -1;
}
int result;
if (tcp_host_is_local(hostname)) {
result = network_loopback_client(port, SOCK_STREAM, error);
} else {
#if ADB_HOST
result = network_connect(hostname, port, SOCK_STREAM, 0, error);
#else
// Disallow arbitrary connections in adbd.
*error = "adbd does not support arbitrary tcp connections";
return -1;
#endif
}
if (result >= 0) {
disable_tcp_nagle(result);
}
return result;
}
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (StartsWith(spec, prefix.c_str())) {
if (!it.second.available) {
*error = StringPrintf("socket type %s is unavailable on this platform",
it.first.c_str());
return -1;
}
return network_local_client(&spec[prefix.length()], it.second.socket_namespace,
SOCK_STREAM, error);
}
}
*error = StringPrintf("unknown socket specification '%s'", spec.c_str());
return -1;
}
int socket_spec_listen(const std::string& spec, std::string* error, int* resolved_tcp_port) {
if (StartsWith(spec, "tcp:")) {
std::string hostname;
int port;
if (!parse_tcp_spec(spec, &hostname, &port, error)) {
return -1;
}
int result;
if (hostname.empty() && gListenAll) {
result = network_inaddr_any_server(port, SOCK_STREAM, error);
} else if (tcp_host_is_local(hostname)) {
result = network_loopback_server(port, SOCK_STREAM, error);
} else {
// TODO: Implement me.
*error = "listening on specified hostname currently unsupported";
return -1;
}
if (result >= 0 && port == 0 && resolved_tcp_port) {
*resolved_tcp_port = adb_socket_get_local_port(result);
}
return result;
}
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (StartsWith(spec, prefix.c_str())) {
if (!it.second.available) {
*error = StringPrintf("attempted to listen on unavailable socket type: '%s'",
spec.c_str());
return -1;
}
return network_local_server(&spec[prefix.length()], it.second.socket_namespace,
SOCK_STREAM, error);
}
}
*error = StringPrintf("unknown socket specification '%s'", spec.c_str());
return -1;
}
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