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platform_system_core/adb/socket_spec.cpp
Joshua Duong 7ce4a267f5 Merge changes from topic "adb-mdns" 
* changes:
  adb pair: allow passing password as command-line argument.
  Change adb auto-connect to use mdns instance name.
  'adb pair' by mdns instance name.
  'adb connect' by mDNS service name.
  Add mDNS service instance name parser.
2020-05-19 00:30:06 +00:00

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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 <limits>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
#include <android-base/parseint.h>
#include <android-base/parsenetaddress.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <cutils/sockets.h>
#include "adb.h"
#include "adb_utils.h"
#include "adb_wifi.h"
#include "sysdeps.h"
using namespace std::string_literals;
using android::base::ConsumePrefix;
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
#if ADB_LINUX
#include <sys/socket.h>
#include "sysdeps/vm_sockets.h"
#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 } },
});
bool parse_tcp_socket_spec(std::string_view spec, std::string* hostname, int* port,
std::string* serial, std::string* error) {
if (!spec.starts_with("tcp:")) {
*error = "specification is not tcp: ";
*error += spec;
return false;
}
std::string hostname_value;
int port_value;
// If the spec is tcp:<port>, parse it ourselves.
// Otherwise, delegate to android::base::ParseNetAddress.
if (android::base::ParseInt(&spec[4], &port_value)) {
// Do the range checking ourselves, because ParseInt rejects 'tcp:65536' and 'tcp:foo:1234'
// identically.
if (port_value < 0 || port_value > 65535) {
*error = StringPrintf("bad port number '%d'", port_value);
return false;
}
} else {
std::string addr(spec.substr(4));
port_value = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
// FIXME: ParseNetAddress rejects port 0. This currently doesn't hurt, because listening
// on an address that isn't 'localhost' is unsupported.
if (!android::base::ParseNetAddress(addr, &hostname_value, &port_value, serial, error)) {
return false;
}
}
if (hostname) {
*hostname = std::move(hostname_value);
}
if (port) {
*port = port_value;
}
return true;
}
int get_host_socket_spec_port(std::string_view spec, std::string* error) {
int port;
if (spec.starts_with("tcp:")) {
if (!parse_tcp_socket_spec(spec, nullptr, &port, nullptr, error)) {
return -1;
}
} else if (spec.starts_with("vsock:")) {
#if ADB_LINUX
std::string spec_str(spec);
std::vector<std::string> fragments = android::base::Split(spec_str, ":");
if (fragments.size() != 2) {
*error = "given vsock server socket string was invalid";
return -1;
}
if (!android::base::ParseInt(fragments[1], &port)) {
*error = "could not parse vsock port";
errno = EINVAL;
return -1;
}
if (port < 0) {
*error = "vsock port was negative.";
errno = EINVAL;
return -1;
}
#else // ADB_LINUX
*error = "vsock is only supported on linux";
return -1;
#endif // ADB_LINUX
} else {
*error = "given socket spec string was invalid";
return -1;
}
return port;
}
static bool tcp_host_is_local(std::string_view hostname) {
// FIXME
return hostname.empty() || hostname == "localhost";
}
bool is_socket_spec(std::string_view spec) {
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (spec.starts_with(prefix)) {
return true;
}
}
return spec.starts_with("tcp:") || spec.starts_with("acceptfd:");
}
bool is_local_socket_spec(std::string_view spec) {
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (spec.starts_with(prefix)) {
return true;
}
}
std::string error;
std::string hostname;
if (!parse_tcp_socket_spec(spec, &hostname, nullptr, nullptr, &error)) {
return false;
}
return tcp_host_is_local(hostname);
}
bool socket_spec_connect(unique_fd* fd, std::string_view address, int* port, std::string* serial,
std::string* error) {
if (address.starts_with("tcp:")) {
std::string hostname;
int port_value = port ? *port : 0;
if (!parse_tcp_socket_spec(address, &hostname, &port_value, serial, error)) {
return false;
}
if (tcp_host_is_local(hostname)) {
fd->reset(network_loopback_client(port_value, SOCK_STREAM, error));
} else {
#if ADB_HOST
// Check if the address is an mdns service we can connect to.
if (auto mdns_info = mdns_get_connect_service_info(address.substr(4));
mdns_info != std::nullopt) {
fd->reset(network_connect(mdns_info->addr, mdns_info->port, SOCK_STREAM, 0, error));
if (fd->get() != -1) {
// TODO(joshuaduong): We still show the ip address for the serial. Change it to
// use the mdns instance name, so we can adjust to address changes on
// reconnects.
port_value = mdns_info->port;
if (serial) {
*serial = android::base::StringPrintf("%s.%s",
mdns_info->service_name.c_str(),
mdns_info->service_type.c_str());
}
}
} else {
fd->reset(network_connect(hostname, port_value, SOCK_STREAM, 0, error));
}
#else
// Disallow arbitrary connections in adbd.
*error = "adbd does not support arbitrary tcp connections";
return false;
#endif
}
if (fd->get() > 0) {
disable_tcp_nagle(fd->get());
if (port) {
*port = port_value;
}
return true;
}
return false;
} else if (address.starts_with("vsock:")) {
#if ADB_LINUX
std::string spec_str(address);
std::vector<std::string> fragments = android::base::Split(spec_str, ":");
unsigned int port_value = port ? *port : 0;
if (fragments.size() != 2 && fragments.size() != 3) {
*error = android::base::StringPrintf("expected vsock:cid or vsock:port:cid in '%s'",
spec_str.c_str());
errno = EINVAL;
return false;
}
unsigned int cid = 0;
if (!android::base::ParseUint(fragments[1], &cid)) {
*error = android::base::StringPrintf("could not parse vsock cid in '%s'",
spec_str.c_str());
errno = EINVAL;
return false;
}
if (fragments.size() == 3 && !android::base::ParseUint(fragments[2], &port_value)) {
*error = android::base::StringPrintf("could not parse vsock port in '%s'",
spec_str.c_str());
errno = EINVAL;
return false;
}
if (port_value == 0) {
*error = android::base::StringPrintf("vsock port was not provided.");
errno = EINVAL;
return false;
}
fd->reset(socket(AF_VSOCK, SOCK_STREAM, 0));
if (fd->get() == -1) {
*error = "could not open vsock socket";
return false;
}
sockaddr_vm addr{};
addr.svm_family = AF_VSOCK;
addr.svm_port = port_value;
addr.svm_cid = cid;
if (serial) {
*serial = android::base::StringPrintf("vsock:%u:%d", cid, port_value);
}
if (connect(fd->get(), reinterpret_cast<sockaddr*>(&addr), sizeof(addr))) {
int error_num = errno;
*error = android::base::StringPrintf("could not connect to vsock address '%s'",
spec_str.c_str());
errno = error_num;
return false;
}
if (port) {
*port = port_value;
}
return true;
#else // ADB_LINUX
*error = "vsock is only supported on linux";
return false;
#endif // ADB_LINUX
} else if (address.starts_with("acceptfd:")) {
*error = "cannot connect to acceptfd";
return false;
}
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (address.starts_with(prefix)) {
if (!it.second.available) {
*error = StringPrintf("socket type %s is unavailable on this platform",
it.first.c_str());
return false;
}
fd->reset(network_local_client(&address[prefix.length()], it.second.socket_namespace,
SOCK_STREAM, error));
if (fd->get() < 0) {
*error =
android::base::StringPrintf("could not connect to %s address '%s'",
it.first.c_str(), std::string(address).c_str());
return false;
}
if (serial) {
*serial = address;
}
return true;
}
}
*error = "unknown socket specification: ";
*error += address;
return false;
}
int socket_spec_listen(std::string_view spec, std::string* error, int* resolved_port) {
if (spec.starts_with("tcp:")) {
std::string hostname;
int port;
if (!parse_tcp_socket_spec(spec, &hostname, &port, nullptr, error)) {
return -1;
}
int result;
#if ADB_HOST
if (hostname.empty() && gListenAll) {
#else
if (hostname.empty()) {
#endif
result = network_inaddr_any_server(port, SOCK_STREAM, error);
} else if (tcp_host_is_local(hostname)) {
result = network_loopback_server(port, SOCK_STREAM, error, true);
} else if (hostname == "::1") {
result = network_loopback_server(port, SOCK_STREAM, error, false);
} else {
// TODO: Implement me.
*error = "listening on specified hostname currently unsupported";
return -1;
}
if (result >= 0 && resolved_port) {
*resolved_port = adb_socket_get_local_port(result);
}
return result;
} else if (spec.starts_with("vsock:")) {
#if ADB_LINUX
std::string spec_str(spec);
std::vector<std::string> fragments = android::base::Split(spec_str, ":");
if (fragments.size() != 2) {
*error = "given vsock server socket string was invalid";
return -1;
}
int port;
if (!android::base::ParseInt(fragments[1], &port)) {
*error = "could not parse vsock port";
errno = EINVAL;
return -1;
} else if (port < 0) {
*error = "vsock port was negative.";
errno = EINVAL;
return -1;
}
unique_fd serverfd(socket(AF_VSOCK, SOCK_STREAM, 0));
if (serverfd == -1) {
int error_num = errno;
*error = android::base::StringPrintf("could not create vsock server: '%s'",
strerror(error_num));
errno = error_num;
return -1;
}
sockaddr_vm addr{};
addr.svm_family = AF_VSOCK;
addr.svm_port = port == 0 ? VMADDR_PORT_ANY : port;
addr.svm_cid = VMADDR_CID_ANY;
socklen_t addr_len = sizeof(addr);
if (bind(serverfd.get(), reinterpret_cast<struct sockaddr*>(&addr), addr_len)) {
return -1;
}
if (listen(serverfd.get(), 4)) {
return -1;
}
if (serverfd >= 0 && resolved_port) {
if (getsockname(serverfd.get(), reinterpret_cast<sockaddr*>(&addr), &addr_len) == 0) {
*resolved_port = addr.svm_port;
} else {
return -1;
}
}
return serverfd.release();
#else // ADB_LINUX
*error = "vsock is only supported on linux";
return -1;
#endif // ADB_LINUX
} else if (ConsumePrefix(&spec, "acceptfd:")) {
#if ADB_WINDOWS
*error = "socket activation not supported under Windows";
return -1;
#else
// We inherited the socket from some kind of launcher. It's already bound and
// listening. Return a copy of the FD instead of the FD itself so we implement the
// normal "listen" contract and can succeed more than once.
unsigned int fd_u;
if (!ParseUint(&fd_u, spec) || fd_u > std::numeric_limits<int>::max()) {
*error = "invalid fd";
return -1;
}
int fd = static_cast<int>(fd_u);
int flags = get_fd_flags(fd);
if (flags < 0) {
*error = android::base::StringPrintf("could not get flags of inherited fd %d: '%s'", fd,
strerror(errno));
return -1;
}
if (flags & FD_CLOEXEC) {
*error = android::base::StringPrintf("fd %d was not inherited from parent", fd);
return -1;
}
int dummy_sock_type;
socklen_t dummy_sock_type_size = sizeof(dummy_sock_type);
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &dummy_sock_type, &dummy_sock_type_size)) {
*error = android::base::StringPrintf("fd %d does not refer to a socket", fd);
return -1;
}
int new_fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
if (new_fd < 0) {
*error = android::base::StringPrintf("could not dup inherited fd %d: '%s'", fd,
strerror(errno));
return -1;
}
return new_fd;
#endif
}
for (const auto& it : kLocalSocketTypes) {
std::string prefix = it.first + ":";
if (spec.starts_with(prefix)) {
if (!it.second.available) {
*error = "attempted to listen on unavailable socket type: ";
*error += spec;
return -1;
}
return network_local_server(&spec[prefix.length()], it.second.socket_namespace,
SOCK_STREAM, error);
}
}
*error = "unknown socket specification:";
*error += spec;
return -1;
}
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