1 files changed, 618 insertions, 0 deletions

diff --git a/src/idevice.c b/src/idevice.c
new file mode 100644
index 0000000..c5050d5
--- /dev/null
+++ b/src/idevice.c
@@ -0,0 +1,618 @@
+/* 
+ * idevice.c
+ * Device discovery and communication interface.
+ *
+ * Copyright (c) 2008 Zach C. All Rights Reserved.
+ * Copyright (c) 2009 Nikias Bassen. All Rights Reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This library 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
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA 
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <arpa/inet.h>
+
+#include <usbmuxd.h>
+#include <gnutls/gnutls.h>
+#include "idevice.h"
+#include "debug.h"
+
+static idevice_event_cb_t event_cb = NULL;
+
+static void usbmux_event_cb(const usbmuxd_event_t *event, void *user_data)
+{
+        idevice_event_t ev;
+
+        ev.event = event->event;
+        ev.uuid = event->device.uuid;
+        ev.conn_type = CONNECTION_USBMUXD;
+
+        if (event_cb) {
+                event_cb(&ev, user_data);
+        }
+}
+
+/**
+ * Register a callback function that will be called when device add/remove
+ * events occur.
+ *
+ * @param callback Callback function to call.
+ * @param user_data Application-specific data passed as parameter
+ *   to the registered callback function.
+ *
+ * @return IDEVICE_E_SUCCESS on success or an error value when an error occured.
+ */
+idevice_error_t idevice_event_subscribe(idevice_event_cb_t callback, void *user_data)
+{
+        event_cb = callback;
+        int res = usbmuxd_subscribe(usbmux_event_cb, user_data);
+        if (res != 0) {
+                event_cb = NULL;
+                debug_info("Error %d when subscribing usbmux event callback!", res);
+                return IDEVICE_E_UNKNOWN_ERROR;
+        }
+        return IDEVICE_E_SUCCESS;
+}
+
+/**
+ * Release the event callback function that has been registered with
+ *  idevice_event_subscribe().
+ *
+ * @return IDEVICE_E_SUCCESS on success or an error value when an error occured.
+ */
+idevice_error_t idevice_event_unsubscribe()
+{
+        event_cb = NULL;
+        int res = usbmuxd_unsubscribe();
+        if (res != 0) {
+                debug_info("Error %d when unsubscribing usbmux event callback!", res);
+                return IDEVICE_E_UNKNOWN_ERROR;
+        }
+        return IDEVICE_E_SUCCESS;
+}
+
+/**
+ * Get a list of currently available devices.
+ *
+ * @param devices List of uuids of devices that are currently available.
+ *   This list is terminated by a NULL pointer.
+ * @param count Number of devices found.
+ *
+ * @return IDEVICE_E_SUCCESS on success or an error value when an error occured.
+ */
+idevice_error_t idevice_get_device_list(char ***devices, int *count)
+{
+        usbmuxd_device_info_t *dev_list;
+
+        *devices = NULL;
+        *count = 0;
+
+        if (usbmuxd_get_device_list(&dev_list) < 0) {
+                debug_info("ERROR: usbmuxd is not running!\n", __func__);
+                return IDEVICE_E_NO_DEVICE;
+        }
+
+        char **newlist = NULL;
+        int i, newcount = 0;
+
+        for (i = 0; dev_list[i].handle > 0; i++) {
+                newlist = realloc(*devices, sizeof(char*) * (newcount+1));
+                newlist[newcount++] = strdup(dev_list[i].uuid);
+                *devices = newlist;
+        }
+        usbmuxd_device_list_free(&dev_list);
+
+        *count = newcount;
+        newlist = realloc(*devices, sizeof(char*) * (newcount+1));
+        newlist[newcount] = NULL;
+        *devices = newlist;
+
+        return IDEVICE_E_SUCCESS;
+}
+
+/**
+ * Free a list of device uuids.
+ *
+ * @param devices List of uuids to free.
+ *
+ * @return Always returnes IDEVICE_E_SUCCESS.
+ */
+idevice_error_t idevice_device_list_free(char **devices)
+{
+        if (devices) {
+                int i = 0;
+                while (devices[i++]) {
+                        free(devices[i]);
+                }
+                free(devices);
+        }
+        return IDEVICE_E_SUCCESS;
+}
+
+/**
+ * Creates an idevice_t structure for the device specified by uuid,
+ *  if the device is available.
+ *
+ * @note The resulting idevice_t structure has to be freed with
+ * idevice_free() if it is no longer used.
+ *
+ * @param device Upon calling this function, a pointer to a location of type
+ *  idevice_t. On successful return, this location will be populated.
+ * @param uuid The UUID to match.
+ *
+ * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
+ */
+idevice_error_t idevice_new(idevice_t * device, const char *uuid)
+{
+        usbmuxd_device_info_t muxdev;
+        int res = usbmuxd_get_device_by_uuid(uuid, &muxdev);
+        if (res > 0) {
+                idevice_t phone = (idevice_t) malloc(sizeof(struct idevice_int));
+                phone->uuid = strdup(muxdev.uuid);
+                phone->conn_type = CONNECTION_USBMUXD;
+                phone->conn_data = (void*)muxdev.handle;
+                *device = phone;
+                return IDEVICE_E_SUCCESS;
+        }
+        /* other connection types could follow here */
+
+        return IDEVICE_E_NO_DEVICE;
+}
+
+/** Cleans up an idevice structure, then frees the structure itself.  
+ * This is a library-level function; deals directly with the device to tear
+ *  down relations, but otherwise is mostly internal.
+ * 
+ * @param device idevice_t to free.
+ */
+idevice_error_t idevice_free(idevice_t device)
+{
+        if (!device)
+                return IDEVICE_E_INVALID_ARG;
+        idevice_error_t ret = IDEVICE_E_UNKNOWN_ERROR;
+
+        ret = IDEVICE_E_SUCCESS;
+
+        free(device->uuid);
+
+        if (device->conn_type == CONNECTION_USBMUXD) {
+                device->conn_data = 0;
+        }
+        if (device->conn_data) {
+                free(device->conn_data);
+        }
+        free(device);
+        return ret;
+}
+
+/**
+ * Set up a connection to the given device.
+ *
+ * @param device The device to connect to.
+ * @param port The destination port to connect to.
+ * @param connection Pointer to an idevice_connection_t that will be filled
+ *   with the necessary data of the connection.
+ *
+ * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
+ */
+idevice_error_t idevice_connect(idevice_t device, uint16_t port, idevice_connection_t *connection)
+{
+        if (!device) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (device->conn_type == CONNECTION_USBMUXD) {
+                int sfd = usbmuxd_connect((uint32_t)(device->conn_data), port);
+                if (sfd < 0) {
+                        debug_info("ERROR: Connecting to usbmuxd failed: %d (%s)", sfd, strerror(-sfd));
+                        return IDEVICE_E_UNKNOWN_ERROR;
+                }
+                idevice_connection_t new_connection = (idevice_connection_t)malloc(sizeof(struct idevice_connection_int));
+                new_connection->type = CONNECTION_USBMUXD;
+                new_connection->data = (void*)sfd;
+                new_connection->ssl_data = NULL;
+                *connection = new_connection;
+                return IDEVICE_E_SUCCESS;
+        } else {
+                debug_info("Unknown connection type %d", device->conn_type);
+        }
+
+        return IDEVICE_E_UNKNOWN_ERROR;
+}
+
+/**
+ * Disconnect from the device and clean up the connection structure.
+ *
+ * @param connection The connection to close.
+ *
+ * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
+ */
+idevice_error_t idevice_disconnect(idevice_connection_t connection)
+{
+        if (!connection) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+        /* shut down ssl if enabled */
+        if (connection->ssl_data) {
+                idevice_connection_disable_ssl(connection);
+        }
+        idevice_error_t result = IDEVICE_E_UNKNOWN_ERROR;
+        if (connection->type == CONNECTION_USBMUXD) {
+                usbmuxd_disconnect((int)(connection->data));
+                result = IDEVICE_E_SUCCESS;
+        } else {
+                debug_info("Unknown connection type %d", connection->type);
+        }
+        free(connection);
+        return result;
+}
+
+/**
+ * Internally used function to send raw data over the given connection.
+ */
+static idevice_error_t internal_connection_send(idevice_connection_t connection, const char *data, uint32_t len, uint32_t *sent_bytes)
+{
+        if (!connection || !data) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (connection->type == CONNECTION_USBMUXD) {
+                int res = usbmuxd_send((int)(connection->data), data, len, sent_bytes);
+                if (res < 0) {
+                        debug_info("ERROR: usbmuxd_send returned %d (%s)", res, strerror(-res));
+                        return IDEVICE_E_UNKNOWN_ERROR;
+                }
+                return IDEVICE_E_SUCCESS;
+        } else {
+                debug_info("Unknown connection type %d", connection->type);
+        }
+        return IDEVICE_E_UNKNOWN_ERROR;
+
+}
+
+/**
+ * Send data to a device via the given connection.
+ *
+ * @param connection The connection to send data over.
+ * @param data Buffer with data to send.
+ * @param len Size of the buffer to send.
+ * @param sent_bytes Pointer to an uint32_t that will be filled
+ *   with the number of bytes actually sent.
+ *
+ * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
+ */
+idevice_error_t idevice_connection_send(idevice_connection_t connection, const char *data, uint32_t len, uint32_t *sent_bytes)
+{
+        if (!connection || !data || (connection->ssl_data && !connection->ssl_data->session)) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (connection->ssl_data) {
+                ssize_t sent = gnutls_record_send(connection->ssl_data->session, (void*)data, (size_t)len);
+                if ((uint32_t)sent == (uint32_t)len) {
+                        *sent_bytes = sent;
+                        return IDEVICE_E_SUCCESS;
+                }
+                *sent_bytes = 0;
+                return IDEVICE_E_SSL_ERROR;
+        }
+        return internal_connection_send(connection, data, len, sent_bytes);
+}
+
+/**
+ * Internally used function for receiving raw data over the given connection
+ * using a timeout.
+ */
+static idevice_error_t internal_connection_receive_timeout(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes, unsigned int timeout)
+{
+        if (!connection) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (connection->type == CONNECTION_USBMUXD) {
+                int res = usbmuxd_recv_timeout((int)(connection->data), data, len, recv_bytes, timeout);
+                if (res < 0) {
+                        debug_info("ERROR: usbmuxd_recv_timeout returned %d (%s)", res, strerror(-res));
+                        return IDEVICE_E_UNKNOWN_ERROR;
+                }
+                return IDEVICE_E_SUCCESS;
+        } else {
+                debug_info("Unknown connection type %d", connection->type);
+        }
+        return IDEVICE_E_UNKNOWN_ERROR;
+}
+
+/**
+ * Receive data from a device via the given connection.
+ * This function will return after the given timeout even if no data has been
+ * received.
+ *
+ * @param connection The connection to receive data from.
+ * @param data Buffer that will be filled with the received data.
+ *   This buffer has to be large enough to hold len bytes.
+ * @param len Buffer size or number of bytes to receive.
+ * @param recv_bytes Number of bytes actually received.
+ * @param timeout Timeout in milliseconds after which this function should
+ *   return even if no data has been received.
+ *
+ * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
+ */
+idevice_error_t idevice_connection_receive_timeout(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes, unsigned int timeout)
+{
+        if (!connection || (connection->ssl_data && !connection->ssl_data->session)) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (connection->ssl_data) {
+                ssize_t received = gnutls_record_recv(connection->ssl_data->session, (void*)data, (size_t)len);
+                if (received > 0) {
+                        *recv_bytes = received;
+                        return IDEVICE_E_SUCCESS;
+                }
+                *recv_bytes = 0;
+                return IDEVICE_E_SSL_ERROR;
+        }
+        return internal_connection_receive_timeout(connection, data, len, recv_bytes, timeout);
+}
+
+/**
+ * Internally used function for receiving raw data over the given connection.
+ */
+static idevice_error_t internal_connection_receive(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes)
+{
+        if (!connection) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (connection->type == CONNECTION_USBMUXD) {
+                int res = usbmuxd_recv((int)(connection->data), data, len, recv_bytes);
+                if (res < 0) {
+                        debug_info("ERROR: usbmuxd_recv returned %d (%s)", res, strerror(-res));
+                        return IDEVICE_E_UNKNOWN_ERROR;
+                }
+
+                return IDEVICE_E_SUCCESS;
+        } else {
+                debug_info("Unknown connection type %d", connection->type);
+        }
+        return IDEVICE_E_UNKNOWN_ERROR;
+}
+
+/**
+ * Receive data from a device via the given connection.
+ * This function is like idevice_connection_receive_timeout, but with a
+ * predefined reasonable timeout.
+ *
+ * @param connection The connection to receive data from.
+ * @param data Buffer that will be filled with the received data.
+ *   This buffer has to be large enough to hold len bytes.
+ * @param len Buffer size or number of bytes to receive.
+ * @param recv_bytes Number of bytes actually received.
+ *
+ * @return IDEVICE_E_SUCCESS if ok, otherwise an error code.
+ */
+idevice_error_t idevice_connection_receive(idevice_connection_t connection, char *data, uint32_t len, uint32_t *recv_bytes)
+{
+        if (!connection || (connection->ssl_data && !connection->ssl_data->session)) {
+                return IDEVICE_E_INVALID_ARG;
+        }
+
+        if (connection->ssl_data) {
+                ssize_t received = gnutls_record_recv(connection->ssl_data->session, (void*)data, (size_t)len);
+                if (received > 0) {
+                        *recv_bytes = received;
+                        return IDEVICE_E_SUCCESS;
+                }
+                *recv_bytes = 0;
+                return IDEVICE_E_SSL_ERROR;
+        }
+        return internal_connection_receive(connection, data, len, recv_bytes);
+}
+
+idevice_error_t idevice_get_handle(idevice_t device, uint32_t *handle)
+{
+        if (!device)
+                return IDEVICE_E_INVALID_ARG;
+
+        if (device->conn_type == CONNECTION_USBMUXD) {
+                *handle = (uint32_t)device->conn_data;
+                return IDEVICE_E_SUCCESS;
+        } else {
+                debug_info("Unknown connection type %d", device->conn_type);
+        }
+        return IDEVICE_E_UNKNOWN_ERROR;
+}
+
+idevice_error_t idevice_get_uuid(idevice_t device, char **uuid)
+{
+        if (!device)
+                return IDEVICE_E_INVALID_ARG;
+
+        *uuid = strdup(device->uuid);
+        return IDEVICE_E_SUCCESS;
+}
+
+/**
+ * Internally used gnutls callback function for receiving encrypted data.
+ */
+static ssize_t internal_ssl_read(gnutls_transport_ptr_t transport, char *buffer, size_t length)
+{
+        int bytes = 0, pos_start_fill = 0;
+        size_t tbytes = 0;
+        int this_len = length;
+        idevice_error_t res;
+        idevice_connection_t connection = (idevice_connection_t)transport;
+        char *recv_buffer;
+
+        debug_info("pre-read client wants %zi bytes", length);
+
+        recv_buffer = (char *) malloc(sizeof(char) * this_len);
+
+        /* repeat until we have the full data or an error occurs */
+        do {
+                if ((res = internal_connection_receive(connection, recv_buffer, this_len, (uint32_t*)&bytes)) != IDEVICE_E_SUCCESS) {
+                        debug_info("ERROR: idevice_connection_receive returned %d", res);
+                        return res;
+                }
+                debug_info("post-read we got %i bytes", bytes);
+
+                // increase read count
+                tbytes += bytes;
+
+                // fill the buffer with what we got right now
+                memcpy(buffer + pos_start_fill, recv_buffer, bytes);
+                pos_start_fill += bytes;
+
+                if (tbytes >= length) {
+                        break;
+                }
+
+                this_len = length - tbytes;
+                debug_info("re-read trying to read missing %i bytes", this_len);
+        } while (tbytes < length);
+
+        if (recv_buffer) {
+                free(recv_buffer);
+        }
+        return tbytes;
+}
+
+/**
+ * Internally used gnutls callback function for sending encrypted data.
+ */
+static ssize_t internal_ssl_write(gnutls_transport_ptr_t transport, char *buffer, size_t length)
+{
+        uint32_t bytes = 0;
+        idevice_connection_t connection = (idevice_connection_t)transport;
+        debug_info("pre-send length = %zi", length);
+        internal_connection_send(connection, buffer, length, &bytes);
+        debug_info("post-send sent %i bytes", bytes);
+        return bytes;
+}
+
+/**
+ * Internally used function for cleaning up SSL stuff.
+ */
+static void internal_ssl_cleanup(ssl_data_t ssl_data)
+{
+        if (!ssl_data)
+                return;
+
+        if (ssl_data->session) {
+                gnutls_deinit(ssl_data->session);
+        }
+        if (ssl_data->certificate) {
+                gnutls_certificate_free_credentials(ssl_data->certificate);
+        }
+}
+
+/**
+ * Enables SSL for the given connection.
+ *
+ * @param connection The connection to enable SSL for.
+ *
+ * @return IDEVICE_E_SUCCESS on success, IDEVICE_E_INVALID_ARG when connection
+ *     is NULL or connection->ssl_data is non-NULL, or IDEVICE_E_SSL_ERROR when
+ *     SSL initialization, setup, or handshake fails.
+ */
+idevice_error_t idevice_connection_enable_ssl(idevice_connection_t connection)
+{
+        if (!connection || connection->ssl_data)
+                return IDEVICE_E_INVALID_ARG;
+
+        idevice_error_t ret = IDEVICE_E_SSL_ERROR;
+        uint32_t return_me = 0;
+
+        ssl_data_t ssl_data_loc = (ssl_data_t)malloc(sizeof(struct ssl_data_int));
+
+        // Set up GnuTLS...
+        debug_info("enabling SSL mode");
+        errno = 0;
+        gnutls_global_init();
+        gnutls_certificate_allocate_credentials(&ssl_data_loc->certificate);
+        gnutls_certificate_set_x509_trust_file(ssl_data_loc->certificate, "hostcert.pem", GNUTLS_X509_FMT_PEM);
+        gnutls_init(&ssl_data_loc->session, GNUTLS_CLIENT);
+        {
+                int protocol_priority[16] = { GNUTLS_SSL3, 0 };
+                int kx_priority[16] = { GNUTLS_KX_ANON_DH, GNUTLS_KX_RSA, 0 };
+                int cipher_priority[16] = { GNUTLS_CIPHER_AES_128_CBC, GNUTLS_CIPHER_AES_256_CBC, 0 };
+                int mac_priority[16] = { GNUTLS_MAC_SHA1, GNUTLS_MAC_MD5, 0 };
+                int comp_priority[16] = { GNUTLS_COMP_NULL, 0 };
+
+                gnutls_cipher_set_priority(ssl_data_loc->session, cipher_priority);
+                gnutls_compression_set_priority(ssl_data_loc->session, comp_priority);
+                gnutls_kx_set_priority(ssl_data_loc->session, kx_priority);
+                gnutls_protocol_set_priority(ssl_data_loc->session, protocol_priority);
+                gnutls_mac_set_priority(ssl_data_loc->session, mac_priority);
+        }
+        gnutls_credentials_set(ssl_data_loc->session, GNUTLS_CRD_CERTIFICATE, ssl_data_loc->certificate); // this part is killing me.
+
+        debug_info("GnuTLS step 1...");
+        gnutls_transport_set_ptr(ssl_data_loc->session, (gnutls_transport_ptr_t)connection);
+        debug_info("GnuTLS step 2...");
+        gnutls_transport_set_push_function(ssl_data_loc->session, (gnutls_push_func) & internal_ssl_write);
+        debug_info("GnuTLS step 3...");
+        gnutls_transport_set_pull_function(ssl_data_loc->session, (gnutls_pull_func) & internal_ssl_read);
+        debug_info("GnuTLS step 4 -- now handshaking...");
+        if (errno)
+                debug_info("WARN: errno says %s before handshake!", strerror(errno));
+        return_me = gnutls_handshake(ssl_data_loc->session);
+        debug_info("GnuTLS handshake done...");
+
+        if (return_me != GNUTLS_E_SUCCESS) {
+                internal_ssl_cleanup(ssl_data_loc);
+                free(ssl_data_loc);
+                debug_info("GnuTLS reported something wrong.");
+                gnutls_perror(return_me);
+                debug_info("oh.. errno says %s", strerror(errno));
+        } else {
+                connection->ssl_data = ssl_data_loc;
+                ret = IDEVICE_E_SUCCESS;
+                debug_info("SSL mode enabled");
+        }
+        return ret;
+}
+
+/**
+ * Disable SSL for the given connection.
+ *
+ * @param connection The connection to disable SSL for.
+ *
+ * @return IDEVICE_E_SUCCESS on success, IDEVICE_E_INVALID_ARG when connection
+ *     is NULL. This function also returns IDEVICE_E_SUCCESS when SSL is not
+ *     enabled and does no further error checking on cleanup.
+ */
+idevice_error_t idevice_connection_disable_ssl(idevice_connection_t connection)
+{
+        if (!connection)
+                return IDEVICE_E_INVALID_ARG;
+        if (!connection->ssl_data) {
+                /* ignore if ssl is not enabled */ 
+                return IDEVICE_E_SUCCESS;
+        }
+
+        if (connection->ssl_data->session) {
+                gnutls_bye(connection->ssl_data->session, GNUTLS_SHUT_RDWR);
+        }
+        internal_ssl_cleanup(connection->ssl_data);
+        free(connection->ssl_data);
+        connection->ssl_data = NULL;
+
+        debug_info("SSL mode disabled");
+
+        return IDEVICE_E_SUCCESS;
+}
+