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Diffstat (limited to 'src/device_link_service.c')
| -rw-r--r-- | src/device_link_service.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/src/device_link_service.c b/src/device_link_service.c new file mode 100644 index 0000000..e1155a5 --- /dev/null +++ b/src/device_link_service.c @@ -0,0 +1,299 @@ + /* + * device_link_service.c + * DeviceLink service implementation. + * + * Copyright (c) 2010 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 <string.h> +#include <stdlib.h> +#include "device_link_service.h" +#include "property_list_service.h" +#include "debug.h" + +/** + * Internally used function to extract the message string from a DLMessage* + * plist. + * + * @param dl_msg The DeviceLink property list to parse. + * + * @return An allocated char* with the DLMessage from the given plist, + * or NULL when the plist does not contain any DLMessage. It is up to + * the caller to free the allocated memory. + */ +static char *device_link_service_get_message(plist_t dl_msg) +{ + uint32_t cnt = 0; + plist_t cmd = 0; + char *cmd_str = NULL; + + /* sanity check */ + if ((plist_get_node_type(dl_msg) != PLIST_ARRAY) || ((cnt = plist_array_get_size(dl_msg)) < 1)) { + return NULL; + } + + /* get dl command */ + cmd = plist_array_get_item(dl_msg, 0); + if (!cmd || (plist_get_node_type(cmd) != PLIST_STRING)) { + return NULL; + } + + plist_get_string_val(cmd, &cmd_str); + if (!cmd_str) { + return NULL; + } + + if ((strlen(cmd_str) < (strlen("DLMessage")+1)) + || (strncmp(cmd_str, "DLMessage", strlen("DLMessage")))) { + free(cmd_str); + return NULL; + } + + /* we got a DLMessage* command */ + return cmd_str; +} + +/** + * Creates a new device link service client. + * + * @param device The device to connect to. + * @param port Port on device to connect to. + * @param client Reference that will point to a newly allocated + * device_link_service_client_t upon successful return. + * + * @return DEVICE_LINK_SERVICE_E_SUCCESS on success, + * DEVICE_LINK_SERVICE_E_INVALID_ARG when one of the parameters is invalid, + * or DEVICE_LINK_SERVICE_E_MUX_ERROR when the connection failed. + */ +device_link_service_error_t device_link_service_client_new(iphone_device_t device, uint16_t port, device_link_service_client_t *client) +{ + if (!device || port == 0 || !client || *client) { + return DEVICE_LINK_SERVICE_E_INVALID_ARG; + } + + property_list_service_client_t plistclient = NULL; + if (property_list_service_client_new(device, port, &plistclient) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + return DEVICE_LINK_SERVICE_E_MUX_ERROR; + } + + /* create client object */ + device_link_service_client_t client_loc = (device_link_service_client_t) malloc(sizeof(struct device_link_service_client_int)); + client_loc->parent = plistclient; + + /* all done, return success */ + *client = client_loc; + return DEVICE_LINK_SERVICE_E_SUCCESS; +} + +/** + * Frees a device link service client. + * + * @param client The device_link_service_client_t to free. + * + * @return DEVICE_LINK_SERVICE_E_SUCCESS on success, + * DEVICE_LINK_SERVICE_E_INVALID_ARG when one of client or client->parent + * is invalid, or DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR when the was an error + * freeing the parent property_list_service client. + */ +device_link_service_error_t device_link_service_client_free(device_link_service_client_t client) +{ + if (!client) + return DEVICE_LINK_SERVICE_E_INVALID_ARG; + + if (property_list_service_client_free(client->parent) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + return DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR; + } + return DEVICE_LINK_SERVICE_E_SUCCESS; +} + +/** + * Performs the DLMessageVersionExchange with the connected device. + * This should be the first operation to be executed by an implemented + * device link service client. + * + * @param client The device_link_service client to use. + * @param version_major The major version number to check. + * @param version_minor The minor version number to check. + * + * @return DEVICE_LINK_SERVICE_E_SUCCESS on success, + * DEVICE_LINK_SERVICE_E_INVALID_ARG when client is NULL, + * DEVICE_LINK_SERVICE_E_MUX_ERROR when a communication error occurs, + * DEVICE_LINK_SERVICE_E_PLIST_ERROR when the received plist has not the + * expected contents, DEVICE_LINK_SERVICE_E_BAD_VERSION when the version + * given by the device is larger than the given version, + * or DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR otherwise. + */ +device_link_service_error_t device_link_service_version_exchange(device_link_service_client_t client, uint64_t version_major, uint64_t version_minor) +{ + if (!client) + return DEVICE_LINK_SERVICE_E_INVALID_ARG; + + device_link_service_error_t err = DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR; + + /* perform version exchange */ + plist_t array = NULL; + char *msg = NULL; + + /* receive DLMessageVersionExchange from device */ + if (property_list_service_receive_plist(client->parent, &array) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + debug_info("Did not receive initial message from device!"); + err = DEVICE_LINK_SERVICE_E_MUX_ERROR; + goto leave; + } + msg = device_link_service_get_message(array); + if (!msg || strcmp(msg, "DLMessageVersionExchange")) { + debug_info("Did not receive DLMessageVersionExchange from device!"); + err = DEVICE_LINK_SERVICE_E_PLIST_ERROR; + goto leave; + } + free(msg); + msg = NULL; + + /* get major and minor version number */ + if (plist_array_get_size(array) < 3) { + debug_info("DLMessageVersionExchange has unexpected format!"); + err = DEVICE_LINK_SERVICE_E_PLIST_ERROR; + goto leave; + } + plist_t maj = plist_array_get_item(array, 1); + plist_t min = plist_array_get_item(array, 2); + uint64_t vmajor = 0; + uint64_t vminor = 0; + if (maj) { + plist_get_uint_val(maj, &vmajor); + } + if (min) { + plist_get_uint_val(min, &vminor); + } + if (vmajor > version_major) { + debug_info("Version mismatch: device=(%lld,%lld) > expected=(%lld,%lld)", vmajor, vminor, version_major, version_minor); + err = DEVICE_LINK_SERVICE_E_BAD_VERSION; + goto leave; + } else if ((vmajor == version_major) && (vminor > version_minor)) { + debug_info("WARNING: Version mismatch: device=(%lld,%lld) > expected=(%lld,%lld)", vmajor, vminor, version_major, version_minor); + err = DEVICE_LINK_SERVICE_E_BAD_VERSION; + goto leave; + } + plist_free(array); + + /* version is ok, send reply */ + array = plist_new_array(); + plist_array_append_item(array, plist_new_string("DLMessageVersionExchange")); + plist_array_append_item(array, plist_new_string("DLVersionsOk")); + if (property_list_service_send_binary_plist(client->parent, array) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + debug_info("Error when sending DLVersionsOk"); + err = DEVICE_LINK_SERVICE_E_MUX_ERROR; + goto leave; + } + plist_free(array); + + /* receive DeviceReady message */ + array = NULL; + if (property_list_service_receive_plist(client->parent, &array) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + debug_info("Error when receiving DLMessageDeviceReady!"); + err = DEVICE_LINK_SERVICE_E_MUX_ERROR; + goto leave; + } + msg = device_link_service_get_message(array); + if (!msg || strcmp(msg, "DLMessageDeviceReady")) { + debug_info("Did not get DLMessageDeviceReady!"); + err = DEVICE_LINK_SERVICE_E_PLIST_ERROR; + goto leave; + } + err = DEVICE_LINK_SERVICE_E_SUCCESS; + +leave: + if (msg) { + free(msg); + } + if (array) { + plist_free(array); + } + return err; +} + +/** + * Performs a disconnect with the connected device link service client. + * + * @param client The device link service client to disconnect. + * + * @return DEVICE_LINK_SERVICE_E_SUCCESS on success, + * DEVICE_LINK_SERVICE_E_INVALID_ARG if client is NULL, + * or DEVICE_LINK_SERVICE_E_MUX_ERROR when there's an error when sending + * the the disconnect message. + */ +device_link_service_error_t device_link_service_disconnect(device_link_service_client_t client) +{ + if (!client) + return DEVICE_LINK_SERVICE_E_INVALID_ARG; + + plist_t array = plist_new_array(); + plist_array_append_item(array, plist_new_string("DLMessageDisconnect")); + plist_array_append_item(array, plist_new_string("All done, thanks for the memories")); + + device_link_service_error_t err = DEVICE_LINK_SERVICE_E_SUCCESS; + if (property_list_service_send_binary_plist(client->parent, array) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + err = DEVICE_LINK_SERVICE_E_MUX_ERROR; + } + plist_free(array); + return err; +} + +/** + * Generic device link service send function. + * + * @param client The device link service client to use for sending + * @param plist The property list to send + * + * @return DEVICE_LINK_SERVICE_E_SUCCESS on success, + * DEVICE_LINK_SERVICE_E_INVALID_ARG when client or plist is NULL, + * or DEVICE_LINK_SERVICE_E_MUX_ERROR when the given property list could + * not be sent. + */ +device_link_service_error_t device_link_service_send(device_link_service_client_t client, plist_t plist) +{ + if (!client || !plist) { + return DEVICE_LINK_SERVICE_E_INVALID_ARG; + } + if (property_list_service_send_binary_plist(client->parent, plist) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + return DEVICE_LINK_SERVICE_E_MUX_ERROR; + } + return DEVICE_LINK_SERVICE_E_SUCCESS; +} + +/* Generic device link service receive function. + * + * @param client The device link service client to use for sending + * @param plist Pointer that will point to the property list received upon + * successful return. + * + * @return DEVICE_LINK_SERVICE_E_SUCCESS on success, + * DEVICE_LINK_SERVICE_E_INVALID_ARG when client or plist is NULL, + * or DEVICE_LINK_SERVICE_E_MUX_ERROR when no property list could be + * received. + */ +device_link_service_error_t device_link_service_receive(device_link_service_client_t client, plist_t *plist) +{ + if (!client || !plist || (plist && *plist)) { + return DEVICE_LINK_SERVICE_E_INVALID_ARG; + } + + if (property_list_service_receive_plist(client->parent, plist) != PROPERTY_LIST_SERVICE_E_SUCCESS) { + return DEVICE_LINK_SERVICE_E_MUX_ERROR; + } + return DEVICE_LINK_SERVICE_E_SUCCESS; +} + |