Enable "localfilesystem" UNIX domain socket for ADB.

This patch introduce "service.adb.listen_addrs", a new
string type property, while keeping the old properties.
The new property added in this patch is used to listen
on UNIX domain socket "localfilesystem".

"service.adb.listen_addrs" can be used to listen on
multiple addresses, such as tcp:5555 and tcp:5556.
It is separated by ',' (comma) character.

In the process of introducing the new socket type, the
method tcp_connect is removed and combined into
socket_spec_connect.

Without specifying using the new property, adb will
try to listen on both tcp and vsock (following the
previous implementation).

Some examples of the new property value are:
  - "tcp:5555"
  - "vsock:5555"
  - "localfilesystem:/tmp/test"
  - "tcp:5555,vsock:5555"

Bug: 133378083
Test: On master-arc-dev:
        adb root;
        setprop service.adb.listen_addrs localfilesystem:
	    <path_to_socket>;
        adb connect localfilesystem:<path_to_socket>;
        adb -s localfilesystem:<path_to_socket> shell;
	    inside Chrome OS.
Test: On aosp_bluefin:
        setprop service.adb.listen_addr tcp:5555;
        adb connect <IP>:5555; adb shell;
Test: On aosp_bluefin:
        setprop service.adb.tcp.port 5555;
        adb connect <IP>:5555; adb shell;
Test: On aosp_bluefin:
        setprop service.adb.listen_addrs tcp:5555,tcp:6666;
        adb connect <IP>:5555; adb shell;
        adb connect <IP>:6666; adb shell;
Test: On aosp_bluefin:
        ./adb_test;
Test: On cuttlefish:
        launch_cvd;
        adb -s 127.0.0.1:6520 shell;
Test: Ran host tests:
        ./adb_test;
        ./adb_integration_test_adb;
        ./adb_integration_test_device;

Change-Id: I8289bf0ab3305cf23ce5695ffba46845d58ef6bb
diff --git a/adb/daemon/main.cpp b/adb/daemon/main.cpp
index 7277cc8..3322574 100644
--- a/adb/daemon/main.cpp
+++ b/adb/daemon/main.cpp
@@ -32,11 +32,13 @@
 #include <sys/prctl.h>
 
 #include <memory>
+#include <vector>
 
 #include <android-base/logging.h>
 #include <android-base/macros.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
+#include <android-base/strings.h>
 
 #if defined(__ANDROID__)
 #include <libminijail.h>
@@ -51,6 +53,7 @@
 #include "adb_auth.h"
 #include "adb_listeners.h"
 #include "adb_utils.h"
+#include "socket_spec.h"
 #include "transport.h"
 
 #include "mdns.h"
@@ -179,12 +182,26 @@
 }
 #endif
 
-static void setup_port(int port) {
-    LOG(INFO) << "adbd listening on port " << port;
-    local_init(port);
+static void setup_adb(const std::vector<std::string>& addrs) {
 #if defined(__ANDROID__)
+    // Get the first valid port from addrs and setup mDNS.
+    int port = -1;
+    std::string error;
+    for (const auto& addr : addrs) {
+        port = get_host_socket_spec_port(addr, &error);
+        if (port != -1) {
+            break;
+        }
+    }
+    if (port == -1) {
+        port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
+    }
     setup_mdns(port);
 #endif
+    for (const auto& addr : addrs) {
+        LOG(INFO) << "adbd listening on " << addr;
+        local_init(addr);
+    }
 }
 
 int adbd_main(int server_port) {
@@ -248,25 +265,38 @@
     // If one of these properties is set, also listen on that port.
     // If one of the properties isn't set and we couldn't listen on usb, listen
     // on the default port.
-    std::string prop_port = android::base::GetProperty("service.adb.tcp.port", "");
-    if (prop_port.empty()) {
-        prop_port = android::base::GetProperty("persist.adb.tcp.port", "");
-    }
+    std::vector<std::string> addrs;
+    std::string prop_addr = android::base::GetProperty("service.adb.listen_addrs", "");
+    if (prop_addr.empty()) {
+        std::string prop_port = android::base::GetProperty("service.adb.tcp.port", "");
+        if (prop_port.empty()) {
+            prop_port = android::base::GetProperty("persist.adb.tcp.port", "");
+        }
 
 #if !defined(__ANDROID__)
-    if (prop_port.empty() && getenv("ADBD_PORT")) {
-        prop_port = getenv("ADBD_PORT");
-    }
+        if (prop_port.empty() && getenv("ADBD_PORT")) {
+            prop_port = getenv("ADBD_PORT");
+        }
 #endif
 
-    int port;
-    if (sscanf(prop_port.c_str(), "%d", &port) == 1 && port > 0) {
-        D("using port=%d", port);
-        // Listen on TCP port specified by service.adb.tcp.port property.
-        setup_port(port);
-    } else if (!is_usb) {
-        // Listen on default port.
-        setup_port(DEFAULT_ADB_LOCAL_TRANSPORT_PORT);
+        int port;
+        if (sscanf(prop_port.c_str(), "%d", &port) == 1 && port > 0) {
+            D("using tcp port=%d", port);
+            // Listen on TCP and VSOCK port specified by service.adb.tcp.port property.
+            addrs.push_back(android::base::StringPrintf("tcp:%d", port));
+            addrs.push_back(android::base::StringPrintf("vsock:%d", port));
+            setup_adb(addrs);
+        } else if (!is_usb) {
+            // Listen on default port.
+            addrs.push_back(
+                    android::base::StringPrintf("tcp:%d", DEFAULT_ADB_LOCAL_TRANSPORT_PORT));
+            addrs.push_back(
+                    android::base::StringPrintf("vsock:%d", DEFAULT_ADB_LOCAL_TRANSPORT_PORT));
+            setup_adb(addrs);
+        }
+    } else {
+        addrs = android::base::Split(prop_addr, ",");
+        setup_adb(addrs);
     }
 
     D("adbd_main(): pre init_jdwp()");