Move core-connection.c from to android/protocol/

Change-Id: I1f04ed1f00fccdea043f4a4fbf5ba745b36bbcc7

1 files changed, 363 insertions, 0 deletions

diff --git a/android/protocol/core-connection.c b/android/protocol/core-connection.c
new file mode 100644
index 0000000..6de5386
--- /dev/null
+++ b/android/protocol/core-connection.c
@@ -0,0 +1,363 @@
+/* Copyright (C) 2010 The Android Open Source Project
+**
+** This software is licensed under the terms of the GNU General Public
+** License version 2, as published by the Free Software Foundation, and
+** may be copied, distributed, and modified under those terms.
+**
+** This program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+*/
+
+#include <unistd.h>
+
+#include "sockets.h"
+#include "qemu-common.h"
+#include "errno.h"
+#include "iolooper.h"
+#include "android/android.h"
+#include "android/utils/debug.h"
+#include "android/globals.h"
+#include "android/utils/system.h"
+#include "android/protocol/core-connection.h"
+
+/* Descriptor for a client, connected to the core via console port. */
+struct CoreConnection {
+    /* Socket address of the console. */
+    SockAddress console_address;
+
+    // Helper for performing sync I/O on the console socket.
+    SyncSocket* ssocket;
+
+    /* Stream name. Can be:
+     *  - NULL for the console itself.
+     *  - "attach-UI" for the attached UI client.
+     */
+    char* stream_name;
+};
+
+/*
+ * Zero-terminates string buffer.
+ * Param:
+ *  buf - Buffer containing the string.
+ *  buf_size - Buffer size.
+ *  eos - String size.
+ */
+static inline void
+_zero_terminate(char* buf, size_t buf_size, size_t eos)
+{
+    if (eos < buf_size) {
+        buf[eos] = '\0';
+    } else {
+        buf[buf_size - 1] = '\0';
+    }
+}
+
+/*
+ * Checks if console has replied with "OK"
+ * Param:
+ *  reply - String containing console's reply
+ * Return:
+ *  boolean: true if reply was "OK", or false otherwise.
+ */
+static int
+_is_reply_ok(const char* reply, int reply_size)
+{
+    return (reply_size < 2) ? 0 : (reply[0] == 'O' && reply[1] == 'K');
+}
+
+/*
+ * Checks if console has replied with "KO"
+ * Param:
+ *  reply - String containing console's reply
+ * Return:
+ *  boolean: true if reply was "KO", or false otherwise.
+ */
+static int
+_is_reply_ko(const char* reply, int reply_size)
+{
+    return (reply_size < 2) ? 0 : (reply[0] == 'K' && reply[1] == 'O');
+}
+
+SyncSocket*
+core_connection_open_socket(SockAddress* sockaddr)
+{
+    SyncSocket* ssocket;
+    int status;
+    int64_t deadline;
+    char buf[512];
+
+    int fd = socket_create(sock_address_get_family(sockaddr), SOCKET_STREAM);
+    if (fd < 0) {
+        return NULL;
+    }
+
+    socket_set_xreuseaddr(fd);
+
+    // Create sync connection to the console.
+    ssocket = syncsocket_connect(fd, sockaddr, CORE_PORT_TIMEOUT_MS);
+    if (ssocket == NULL) {
+        derror("syncsocket_connect has failed: %s\n", errno_str);
+        socket_close(fd);
+        return NULL;
+    }
+
+    // Upon successful connection the console will reply with two strings:
+    // "Android Console....", and "OK\r\n". Read them and check.
+    status = syncsocket_start_read(ssocket);
+    if (status < 0) {
+        derror("syncsocket_start_read has failed: %s\n", errno_str);
+        syncsocket_free(ssocket);
+        return NULL;
+    }
+
+    deadline = iolooper_now() + CORE_PORT_TIMEOUT_MS;
+    // Read first line.
+    status = syncsocket_read_line_absolute(ssocket, buf, sizeof(buf), deadline);
+    if (status <= 0) {
+        derror("syncsocket_read_line_absolute has failed: %s\n", errno_str);
+        syncsocket_free(ssocket);
+        return NULL;
+    }
+    if (status < 15 || memcmp(buf, "Android Console", 15)) {
+        _zero_terminate(buf, sizeof(buf), status);
+        derror("console has failed the connection: %s\n", buf);
+        syncsocket_free(ssocket);
+        return NULL;
+    }
+    // Read second line
+    status = syncsocket_read_line_absolute(ssocket, buf, sizeof(buf), deadline);
+    syncsocket_stop_read(ssocket);
+    if (status < 2 || !_is_reply_ok(buf, status)) {
+        _zero_terminate(buf, sizeof(buf), status);
+        derror("unexpected reply from the console: %s\n", buf);
+        syncsocket_free(ssocket);
+        return NULL;
+    }
+
+    return ssocket;
+}
+
+CoreConnection*
+core_connection_create(SockAddress* console_address)
+{
+    CoreConnection* desc;
+    ANEW0(desc);
+    desc->console_address = console_address[0];
+    desc->ssocket = NULL;
+    desc->stream_name = NULL;
+
+    return desc;
+}
+
+void
+core_connection_free(CoreConnection* desc)
+{
+    if (desc == NULL) {
+        return;
+    }
+    if (desc->ssocket != NULL) {
+        syncsocket_free(desc->ssocket);
+    }
+    if (desc->stream_name != NULL) {
+        free(desc->stream_name);
+    }
+    free(desc);
+}
+
+int
+core_connection_open(CoreConnection* desc)
+{
+    if (desc == NULL) {
+        errno = EINVAL;
+        return -1;
+    }
+    if (desc->ssocket != NULL) {
+        return 0;
+    }
+
+    desc->ssocket = core_connection_open_socket(&desc->console_address);
+
+    return (desc->ssocket != NULL) ? 0 : -1;
+}
+
+void
+core_connection_close(CoreConnection* desc)
+{
+    if (desc == NULL) {
+        return;
+    }
+    if (desc->ssocket != NULL) {
+        syncsocket_close(desc->ssocket);
+    }
+}
+
+int
+core_connection_write(CoreConnection* desc,
+                      const void* buffer,
+                      size_t to_write,
+                      size_t* written_bytes)
+{
+    ssize_t written;
+
+    int status = syncsocket_start_write(desc->ssocket);
+    if (status < 0) {
+        derror("syncsocket_start_write failed: %s\n", errno_str);
+        return status;
+    }
+
+    written =
+        syncsocket_write(desc->ssocket, buffer, to_write, CORE_PORT_TIMEOUT_MS);
+    syncsocket_stop_write(desc->ssocket);
+    if (written <= 0) {
+        derror("syncsocket_write failed: %s\n", errno_str);
+        return -1;
+    }
+    if (written_bytes != NULL) {
+        *written_bytes = written;
+    }
+
+    return 0;
+}
+
+int
+core_connection_read(CoreConnection* desc,
+                     void* buffer,
+                     size_t to_read,
+                     size_t* read_bytes)
+{
+    ssize_t read_size;
+
+    int status = syncsocket_start_read(desc->ssocket);
+    if (status < 0) {
+        derror("syncsocket_start_read failed: %s\n", errno_str);
+        return status;
+    }
+
+    read_size =
+        syncsocket_read(desc->ssocket, buffer, to_read, CORE_PORT_TIMEOUT_MS);
+    syncsocket_stop_read(desc->ssocket);
+    if (read_size <= 0) {
+        derror("syncsocket_read failed: %s\n", errno_str);
+        return -1;
+    }
+
+    if (read_bytes != NULL) {
+        *read_bytes = read_size;
+    }
+    return 0;
+}
+
+int
+core_connection_switch_stream(CoreConnection* desc,
+                              const char* stream_name,
+                              char** handshake)
+{
+    char buf[4096];
+    int handshake_len;
+    int status;
+    int64_t deadline;
+
+    *handshake = NULL;
+    if (desc == NULL || desc->stream_name != NULL || stream_name == NULL) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    // Prepare and write "switch" command.
+    snprintf(buf, sizeof(buf), "qemu %s\r\n", stream_name);
+    if (core_connection_write(desc, buf, strlen(buf), NULL)) {
+        return -1;
+    }
+
+    // Read result / handshake
+    status = syncsocket_start_read(desc->ssocket);
+    if (status < 0) {
+        return -1;
+    }
+    deadline = iolooper_now() + CORE_PORT_TIMEOUT_MS;
+    handshake_len =
+        syncsocket_read_line_absolute(desc->ssocket, buf, sizeof(buf), deadline);
+    _zero_terminate(buf, sizeof(buf), handshake_len);
+    // Replace terminating "\r\n" with 0
+    if (handshake_len >= 1) {
+        if (buf[handshake_len - 1] == '\r' || buf[handshake_len - 1] == '\n') {
+            buf[handshake_len - 1] = '\0';
+            if (handshake_len >= 2 && (buf[handshake_len - 2] == '\r' ||
+                                       buf[handshake_len - 2] == '\n')) {
+                buf[handshake_len - 2] = '\0';
+            }
+        }
+    }
+    // Lets see what kind of response we've got here.
+    if (_is_reply_ok(buf, handshake_len)) {
+        *handshake = strdup(buf + 3);
+        desc->stream_name = strdup(stream_name);
+        // We expect an "OK" string here
+        status = syncsocket_read_line_absolute(desc->ssocket, buf, sizeof(buf),
+                                               deadline);
+        syncsocket_stop_read(desc->ssocket);
+        if (status < 0) {
+            derror("error reading console reply on stream switch: %s\n", errno_str);
+            return -1;
+        } else if (!_is_reply_ok(buf, status)) {
+            _zero_terminate(buf, sizeof(buf), status);
+            derror("unexpected console reply when switching streams: %s\n", buf);
+            return -1;
+        }
+        return 0;
+    } else if (_is_reply_ko(buf, handshake_len)) {
+        derror("console has rejected stream switch: %s\n", buf);
+        syncsocket_stop_read(desc->ssocket);
+        *handshake = strdup(buf + 3);
+        return -1;
+    } else {
+        // No OK, no KO? Should be an error!
+        derror("unexpected console reply when switching streams: %s\n", buf);
+        syncsocket_stop_read(desc->ssocket);
+        *handshake = strdup(buf);
+        return -1;
+    }
+}
+
+CoreConnection*
+core_connection_create_and_switch(SockAddress* console_socket,
+                                  const char* stream_name,
+                                  char** handshake)
+{
+    char switch_cmd[256];
+    CoreConnection* connection = NULL;
+
+    // Connect to the console service.
+    connection = core_connection_create(console_socket);
+    if (connection == NULL) {
+        return NULL;
+    }
+    if (core_connection_open(connection)) {
+        core_connection_free(connection);
+        return NULL;
+    }
+
+    // Perform the switch.
+    snprintf(switch_cmd, sizeof(switch_cmd), "%s", stream_name);
+    if (core_connection_switch_stream(connection, switch_cmd, handshake)) {
+        core_connection_close(connection);
+        core_connection_free(connection);
+        return NULL;
+    }
+
+    return connection;
+}
+
+void
+core_connection_detach(CoreConnection* desc)
+{
+    core_connection_write(desc, "\n", 1, NULL);
+}
+
+int
+core_connection_get_socket(CoreConnection* desc)
+{
+    return (desc != NULL) ? syncsocket_get_socket(desc->ssocket) : -1;
+}