adb: check our socketpair ends in our win32 emulation.

In our Win32 socketpair emulation, check that the ends are properly
connected before returning.

Change-Id: I33d356fd9ebcac89fc6a89a5200e926032220383
Test: no additional failing tests in adb_test.exe

adb/sysdeps.h

@@ -285,6 +285,10 @@ extern int  adb_socket_accept(int  serverfd, struct sockaddr*  addr, socklen_t
 #undef   accept
 #define  accept  ___xxx_accept
 
+int adb_getsockname(int fd, struct sockaddr* sockaddr, socklen_t* optlen);
+#undef getsockname
+#define getsockname(...) ___xxx_getsockname(__VA__ARGS__)
+
 // Returns the local port number of a bound socket, or -1 on failure.
 int adb_socket_get_local_port(int fd);
 

adb/sysdeps_win32.cpp

@@ -1061,7 +1061,7 @@ int adb_getsockname(int fd, struct sockaddr* sockaddr, socklen_t* optlen) {
         return -1;
     }
 
-    int result = getsockname(fh->fh_socket, sockaddr, optlen);
+    int result = (getsockname)(fh->fh_socket, sockaddr, optlen);
     if (result == SOCKET_ERROR) {
         const DWORD err = WSAGetLastError();
         D("adb_getsockname: setsockopt on fd %d failed: %s\n", fd,
@@ -1119,6 +1119,11 @@ int adb_socketpair(int sv[2]) {
     int local_port = -1;
     std::string error;
 
+    struct sockaddr_storage peer_addr = {};
+    struct sockaddr_storage client_addr = {};
+    socklen_t peer_socklen = sizeof(peer_addr);
+    socklen_t client_socklen = sizeof(client_addr);
+
     server = network_loopback_server(0, SOCK_STREAM, &error);
     if (server < 0) {
         D("adb_socketpair: failed to create server: %s", error.c_str());
@@ -1138,12 +1143,32 @@ int adb_socketpair(int sv[2]) {
         goto fail;
     }
 
-    accepted = adb_socket_accept(server, nullptr, nullptr);
+    // Make sure that the peer that connected to us and the client are the same.
+    accepted = adb_socket_accept(server, reinterpret_cast<sockaddr*>(&peer_addr), &peer_socklen);
     if (accepted < 0) {
         D("adb_socketpair: failed to accept: %s", strerror(errno));
         goto fail;
     }
+
+    if (adb_getsockname(client, reinterpret_cast<sockaddr*>(&client_addr), &client_socklen) != 0) {
+        D("adb_socketpair: failed to getpeername: %s", strerror(errno));
+        goto fail;
+    }
+
+    if (peer_socklen != client_socklen) {
+        D("adb_socketpair: client and peer sockaddrs have different lengths");
+        errno = EIO;
+        goto fail;
+    }
+
+    if (memcmp(&peer_addr, &client_addr, peer_socklen) != 0) {
+        D("adb_socketpair: client and peer sockaddrs don't match");
+        errno = EIO;
+        goto fail;
+    }
+
     adb_close(server);
+
     sv[0] = client;
     sv[1] = accepted;
     return 0;