fastboot: use cutils socket functions.

Now that cutils has cross-platform socket functionality, we can
restructure fastboot to remove platform-dependent networking code.

This CL adds socket_set_receive_timeout() to libcutils and combines the
fastboot socket code into a single implementation. It also adds TCP
functionality to fastboot sockets, but nothing uses it yet except for
the unit tests. A future CL will add the TCP protocol which will use
this TCP socket implementation.

Bug: http://b/26558551

Change-Id: If613fb348f9332b31fa2c88d67fb1e839923768a

1 files changed, 212 insertions, 0 deletions

diff --git a/fastboot/socket.cpp b/fastboot/socket.cpp
new file mode 100644
index 000000000..d41f1fe6f
--- /dev/null
+++ b/fastboot/socket.cpp
@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "socket.h"
+
+#include <android-base/stringprintf.h>
+
+Socket::Socket(cutils_socket_t sock) : sock_(sock) {}
+
+Socket::~Socket() {
+    Close();
+}
+
+int Socket::Close() {
+    int ret = 0;
+
+    if (sock_ != INVALID_SOCKET) {
+        ret = socket_close(sock_);
+        sock_ = INVALID_SOCKET;
+    }
+
+    return ret;
+}
+
+bool Socket::SetReceiveTimeout(int timeout_ms) {
+    if (timeout_ms != receive_timeout_ms_) {
+        if (socket_set_receive_timeout(sock_, timeout_ms) == 0) {
+            receive_timeout_ms_ = timeout_ms;
+            return true;
+        }
+        return false;
+    }
+
+    return true;
+}
+
+ssize_t Socket::ReceiveAll(void* data, size_t length, int timeout_ms) {
+    size_t total = 0;
+
+    while (total < length) {
+        ssize_t bytes = Receive(reinterpret_cast<char*>(data) + total, length - total, timeout_ms);
+
+        if (bytes == -1) {
+            if (total == 0) {
+                return -1;
+            }
+            break;
+        }
+        total += bytes;
+    }
+
+    return total;
+}
+
+// Implements the Socket interface for UDP.
+class UdpSocket : public Socket {
+  public:
+    enum class Type { kClient, kServer };
+
+    UdpSocket(Type type, cutils_socket_t sock);
+
+    ssize_t Send(const void* data, size_t length) override;
+    ssize_t Receive(void* data, size_t length, int timeout_ms) override;
+
+  private:
+    std::unique_ptr<sockaddr_storage> addr_;
+    socklen_t addr_size_ = 0;
+
+    DISALLOW_COPY_AND_ASSIGN(UdpSocket);
+};
+
+UdpSocket::UdpSocket(Type type, cutils_socket_t sock) : Socket(sock) {
+    // Only servers need to remember addresses; clients are connected to a server in NewClient()
+    // so will send to that server without needing to specify the address again.
+    if (type == Type::kServer) {
+        addr_.reset(new sockaddr_storage);
+        addr_size_ = sizeof(*addr_);
+        memset(addr_.get(), 0, addr_size_);
+    }
+}
+
+ssize_t UdpSocket::Send(const void* data, size_t length) {
+    return TEMP_FAILURE_RETRY(sendto(sock_, reinterpret_cast<const char*>(data), length, 0,
+                                     reinterpret_cast<sockaddr*>(addr_.get()), addr_size_));
+}
+
+ssize_t UdpSocket::Receive(void* data, size_t length, int timeout_ms) {
+    if (!SetReceiveTimeout(timeout_ms)) {
+        return -1;
+    }
+
+    socklen_t* addr_size_ptr = nullptr;
+    if (addr_ != nullptr) {
+        // Reset addr_size as it may have been modified by previous recvfrom() calls.
+        addr_size_ = sizeof(*addr_);
+        addr_size_ptr = &addr_size_;
+    }
+
+    return TEMP_FAILURE_RETRY(recvfrom(sock_, reinterpret_cast<char*>(data), length, 0,
+                                       reinterpret_cast<sockaddr*>(addr_.get()), addr_size_ptr));
+}
+
+// Implements the Socket interface for TCP.
+class TcpSocket : public Socket {
+  public:
+    TcpSocket(cutils_socket_t sock) : Socket(sock) {}
+
+    ssize_t Send(const void* data, size_t length) override;
+    ssize_t Receive(void* data, size_t length, int timeout_ms) override;
+
+    std::unique_ptr<Socket> Accept() override;
+
+  private:
+    DISALLOW_COPY_AND_ASSIGN(TcpSocket);
+};
+
+ssize_t TcpSocket::Send(const void* data, size_t length) {
+    size_t total = 0;
+
+    while (total < length) {
+        ssize_t bytes = TEMP_FAILURE_RETRY(
+                send(sock_, reinterpret_cast<const char*>(data) + total, length - total, 0));
+
+        if (bytes == -1) {
+            if (total == 0) {
+                return -1;
+            }
+            break;
+        }
+        total += bytes;
+    }
+
+    return total;
+}
+
+ssize_t TcpSocket::Receive(void* data, size_t length, int timeout_ms) {
+    if (!SetReceiveTimeout(timeout_ms)) {
+        return -1;
+    }
+
+    return TEMP_FAILURE_RETRY(recv(sock_, reinterpret_cast<char*>(data), length, 0));
+}
+
+std::unique_ptr<Socket> TcpSocket::Accept() {
+    cutils_socket_t handler = accept(sock_, nullptr, nullptr);
+    if (handler == INVALID_SOCKET) {
+        return nullptr;
+    }
+    return std::unique_ptr<TcpSocket>(new TcpSocket(handler));
+}
+
+std::unique_ptr<Socket> Socket::NewClient(Protocol protocol, const std::string& host, int port,
+                                          std::string* error) {
+    if (protocol == Protocol::kUdp) {
+        cutils_socket_t sock = socket_network_client(host.c_str(), port, SOCK_DGRAM);
+        if (sock != INVALID_SOCKET) {
+            return std::unique_ptr<UdpSocket>(new UdpSocket(UdpSocket::Type::kClient, sock));
+        }
+    } else {
+        cutils_socket_t sock = socket_network_client(host.c_str(), port, SOCK_STREAM);
+        if (sock != INVALID_SOCKET) {
+            return std::unique_ptr<TcpSocket>(new TcpSocket(sock));
+        }
+    }
+
+    if (error) {
+        *error = android::base::StringPrintf("Failed to connect to %s:%d", host.c_str(), port);
+    }
+    return nullptr;
+}
+
+// This functionality is currently only used by tests so we don't need any error messages.
+std::unique_ptr<Socket> Socket::NewServer(Protocol protocol, int port) {
+    if (protocol == Protocol::kUdp) {
+        cutils_socket_t sock = socket_inaddr_any_server(port, SOCK_DGRAM);
+        if (sock != INVALID_SOCKET) {
+            return std::unique_ptr<UdpSocket>(new UdpSocket(UdpSocket::Type::kServer, sock));
+        }
+    } else {
+        cutils_socket_t sock = socket_inaddr_any_server(port, SOCK_STREAM);
+        if (sock != INVALID_SOCKET) {
+            return std::unique_ptr<TcpSocket>(new TcpSocket(sock));
+        }
+    }
+
+    return nullptr;
+}