Revert "RpcServer: let system allocate vsock ports"

This reverts commit 022db680633b483ec5fab4f6b0722981482b3a02.

Reason for revert: not in Android 15 release, will be reverted in testing branch only, since it is causing testing issues.

Bug: 381486922
Bug: 380785879
Bug: 380934736

Change-Id: I9a1f0d9b18fc01898b61e338300fad3b4bdbe1a6
Merged-In: I2eec99a8e8f894546e025455cc0c5eb58962395f

5 files changed, 24 insertions, 34 deletions

diff --git a/libs/binder/RpcServer.cpp b/libs/binder/RpcServer.cpp
index b8742af1f9..d9e926a9d5 100644
--- a/libs/binder/RpcServer.cpp
+++ b/libs/binder/RpcServer.cpp
@@ -71,23 +71,8 @@ status_t RpcServer::setupUnixDomainServer(const char* path) {
     return setupSocketServer(UnixSocketAddress(path));
 }
 
-status_t RpcServer::setupVsockServer(unsigned bindCid, unsigned port, unsigned* assignedPort) {
-    auto status = setupSocketServer(VsockSocketAddress(bindCid, port));
-    if (status != OK) return status;
-
-    if (assignedPort == nullptr) return OK;
-    sockaddr_vm addr;
-    socklen_t len = sizeof(addr);
-    if (0 != getsockname(mServer.fd.get(), reinterpret_cast<sockaddr*>(&addr), &len)) {
-        status = -errno;
-        ALOGE("setupVsockServer: Failed to getsockname: %s", strerror(-status));
-        return status;
-    }
-
-    LOG_ALWAYS_FATAL_IF(len != sizeof(addr), "Wrong socket type: len %zu vs len %zu",
-                        static_cast<size_t>(len), sizeof(addr));
-    *assignedPort = addr.svm_port;
-    return OK;
+status_t RpcServer::setupVsockServer(unsigned int bindCid, unsigned int port) {
+    return setupSocketServer(VsockSocketAddress(bindCid, port));
 }
 
 status_t RpcServer::setupInetServer(const char* address, unsigned int port,
diff --git a/libs/binder/include/binder/RpcServer.h b/libs/binder/include/binder/RpcServer.h
index c241d31623..abea0fb40c 100644
--- a/libs/binder/include/binder/RpcServer.h
+++ b/libs/binder/include/binder/RpcServer.h
@@ -85,12 +85,9 @@ public:
 
     /**
      * Creates an RPC server binding to the given CID at the given port.
-     *
-     * Set |port| to VMADDR_PORT_ANY to pick an ephemeral port. In this case, |assignedPort|
-     * will be set to the picked port number, if it is not null.
      */
-    [[nodiscard]] LIBBINDER_EXPORTED status_t setupVsockServer(unsigned bindCid, unsigned port,
-                                                               unsigned* assignedPort = nullptr);
+    [[nodiscard]] LIBBINDER_EXPORTED status_t setupVsockServer(unsigned int bindCid,
+                                                               unsigned int port);
 
     /**
      * Creates an RPC server at the current port using IPv4.
diff --git a/libs/binder/tests/BinderRpcTestServerConfig.aidl b/libs/binder/tests/BinderRpcTestServerConfig.aidl
index 96550bca6b..b2e0ef21c7 100644
--- a/libs/binder/tests/BinderRpcTestServerConfig.aidl
+++ b/libs/binder/tests/BinderRpcTestServerConfig.aidl
@@ -20,6 +20,7 @@ parcelable BinderRpcTestServerConfig {
     int socketType;
     int rpcSecurity;
     int serverVersion;
+    int vsockPort;
     int socketFd; // Inherited from the parent process.
     @utf8InCpp String addr;
 }
diff --git a/libs/binder/tests/binderRpcTest.cpp b/libs/binder/tests/binderRpcTest.cpp
index d88048b96d..cec0dbf54d 100644
--- a/libs/binder/tests/binderRpcTest.cpp
+++ b/libs/binder/tests/binderRpcTest.cpp
@@ -141,6 +141,11 @@ static std::string allocateSocketAddress() {
     return ret;
 };
 
+static unsigned int allocateVsockPort() {
+    static unsigned int vsockPort = 34567;
+    return vsockPort++;
+}
+
 static unique_fd initUnixSocket(std::string addr) {
     auto socket_addr = UnixSocketAddress(addr.c_str());
     unique_fd fd(TEMP_FAILURE_RETRY(socket(socket_addr.addr()->sa_family, SOCK_STREAM, AF_UNIX)));
@@ -295,6 +300,7 @@ std::unique_ptr<ProcessSession> BinderRpc::createRpcTestSocketServerProcessEtc(
     serverConfig.socketType = static_cast<int32_t>(socketType);
     serverConfig.rpcSecurity = static_cast<int32_t>(rpcSecurity);
     serverConfig.serverVersion = serverVersion;
+    serverConfig.vsockPort = allocateVsockPort();
     serverConfig.addr = addr;
     serverConfig.socketFd = socketFd.get();
     for (auto mode : options.serverSupportedFileDescriptorTransportModes) {
@@ -373,7 +379,7 @@ std::unique_ptr<ProcessSession> BinderRpc::createRpcTestSocketServerProcessEtc(
                         unique_fd(dup(bootstrapClientFd.get())));
                 break;
             case SocketType::VSOCK:
-                status = session->setupVsockClient(VMADDR_CID_LOCAL, serverInfo.port);
+                status = session->setupVsockClient(VMADDR_CID_LOCAL, serverConfig.vsockPort);
                 break;
             case SocketType::INET:
                 status = session->setupInetClient("127.0.0.1", serverInfo.port);
@@ -1146,6 +1152,8 @@ INSTANTIATE_TEST_SUITE_P(Trusty, BinderRpc, ::testing::ValuesIn(getTrustyBinderR
 #else // BINDER_RPC_TO_TRUSTY_TEST
 bool testSupportVsockLoopback() {
     // We don't need to enable TLS to know if vsock is supported.
+    unsigned int vsockPort = allocateVsockPort();
+
     unique_fd serverFd(
             TEMP_FAILURE_RETRY(socket(AF_VSOCK, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0)));
 
@@ -1157,12 +1165,12 @@ bool testSupportVsockLoopback() {
 
     sockaddr_vm serverAddr{
             .svm_family = AF_VSOCK,
-            .svm_port = VMADDR_PORT_ANY,
+            .svm_port = vsockPort,
             .svm_cid = VMADDR_CID_ANY,
     };
     int ret = TEMP_FAILURE_RETRY(
             bind(serverFd.get(), reinterpret_cast<sockaddr*>(&serverAddr), sizeof(serverAddr)));
-    LOG_ALWAYS_FATAL_IF(0 != ret, "Could not bind socket to port VMADDR_PORT_ANY: %s",
+    LOG_ALWAYS_FATAL_IF(0 != ret, "Could not bind socket to port %u: %s", vsockPort,
                         strerror(errno));
 
     socklen_t len = sizeof(serverAddr);
@@ -1172,7 +1180,7 @@ bool testSupportVsockLoopback() {
                         "getsockname didn't read the full addr struct");
 
     ret = TEMP_FAILURE_RETRY(listen(serverFd.get(), 1 /*backlog*/));
-    LOG_ALWAYS_FATAL_IF(0 != ret, "Could not listen socket on port %u: %s", serverAddr.svm_port,
+    LOG_ALWAYS_FATAL_IF(0 != ret, "Could not listen socket on port %u: %s", vsockPort,
                         strerror(errno));
 
     // Try to connect to the server using the VMADDR_CID_LOCAL cid
@@ -1181,13 +1189,13 @@ bool testSupportVsockLoopback() {
     // and they return ETIMEDOUT after that.
     unique_fd connectFd(
             TEMP_FAILURE_RETRY(socket(AF_VSOCK, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0)));
-    LOG_ALWAYS_FATAL_IF(!connectFd.ok(), "Could not create socket for port %u: %s",
-                        serverAddr.svm_port, strerror(errno));
+    LOG_ALWAYS_FATAL_IF(!connectFd.ok(), "Could not create socket for port %u: %s", vsockPort,
+                        strerror(errno));
 
     bool success = false;
     sockaddr_vm connectAddr{
             .svm_family = AF_VSOCK,
-            .svm_port = serverAddr.svm_port,
+            .svm_port = vsockPort,
             .svm_cid = VMADDR_CID_LOCAL,
     };
     ret = TEMP_FAILURE_RETRY(connect(connectFd.get(), reinterpret_cast<sockaddr*>(&connectAddr),
@@ -1536,9 +1544,8 @@ public:
                     };
                 } break;
                 case SocketType::VSOCK: {
-                    unsigned port;
-                    auto status =
-                            rpcServer->setupVsockServer(VMADDR_CID_LOCAL, VMADDR_PORT_ANY, &port);
+                    auto port = allocateVsockPort();
+                    auto status = rpcServer->setupVsockServer(VMADDR_CID_LOCAL, port);
                     if (status != OK) {
                         return AssertionFailure() << "setupVsockServer: " << statusToString(status);
                     }
diff --git a/libs/binder/tests/binderRpcTestService.cpp b/libs/binder/tests/binderRpcTestService.cpp
index aef946481f..28125f169c 100644
--- a/libs/binder/tests/binderRpcTestService.cpp
+++ b/libs/binder/tests/binderRpcTestService.cpp
@@ -143,8 +143,8 @@ int main(int argc, char* argv[]) {
             break;
         case SocketType::VSOCK:
             LOG_ALWAYS_FATAL_IF(OK !=
-                                        server->setupVsockServer(VMADDR_CID_LOCAL, VMADDR_PORT_ANY,
-                                                                 &outPort),
+                                        server->setupVsockServer(VMADDR_CID_LOCAL,
+                                                                 serverConfig.vsockPort),
                                 "Need `sudo modprobe vsock_loopback`?");
             break;
         case SocketType::INET: {