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-rw-r--r--lib/libdvben50221/en50221_app_lowspeed.c533
1 files changed, 533 insertions, 0 deletions
diff --git a/lib/libdvben50221/en50221_app_lowspeed.c b/lib/libdvben50221/en50221_app_lowspeed.c
new file mode 100644
index 0000000..a66598a
--- /dev/null
+++ b/lib/libdvben50221/en50221_app_lowspeed.c
@@ -0,0 +1,533 @@
+/*
+ en50221 encoder An implementation for libdvb
+ an implementation for the en50221 transport layer
+
+ Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
+ Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
+ Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+ 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 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include <string.h>
+#include <libdvbmisc/dvbmisc.h>
+#include <pthread.h>
+#include "en50221_app_lowspeed.h"
+#include "en50221_app_tags.h"
+#include "asn_1.h"
+
+struct en50221_app_lowspeed_session {
+ uint16_t session_number;
+ uint8_t *block_chain;
+ uint32_t block_length;
+
+ struct en50221_app_lowspeed_session *next;
+};
+
+struct en50221_app_lowspeed {
+ struct en50221_app_send_functions *funcs;
+
+ en50221_app_lowspeed_command_callback command_callback;
+ void *command_callback_arg;
+
+ en50221_app_lowspeed_send_callback send_callback;
+ void *send_callback_arg;
+
+ struct en50221_app_lowspeed_session *sessions;
+
+ pthread_mutex_t lock;
+};
+
+static int en50221_app_lowspeed_parse_connect_on_channel(struct en50221_app_lowspeed_command *command,
+ uint8_t *data,
+ int data_length);
+static int en50221_app_lowspeed_parse_command(struct en50221_app_lowspeed *lowspeed,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint8_t *data,
+ uint32_t data_length);
+static int en50221_app_lowspeed_parse_send(struct en50221_app_lowspeed *lowspeed,
+ uint8_t slot_id,
+ uint16_t session_number,
+ int more_last,
+ uint8_t *data,
+ uint32_t data_length);
+
+
+
+struct en50221_app_lowspeed *en50221_app_lowspeed_create(struct en50221_app_send_functions *funcs)
+{
+ struct en50221_app_lowspeed *lowspeed = NULL;
+
+ // create structure and set it up
+ lowspeed = malloc(sizeof(struct en50221_app_lowspeed));
+ if (lowspeed == NULL) {
+ return NULL;
+ }
+ lowspeed->funcs = funcs;
+ lowspeed->command_callback = NULL;
+ lowspeed->send_callback = NULL;
+ lowspeed->sessions = NULL;
+
+ pthread_mutex_init(&lowspeed->lock, NULL);
+
+ // done
+ return lowspeed;
+}
+
+void en50221_app_lowspeed_destroy(struct en50221_app_lowspeed *lowspeed)
+{
+ struct en50221_app_lowspeed_session *cur_s = lowspeed->sessions;
+ while (cur_s) {
+ struct en50221_app_lowspeed_session *next = cur_s->next;
+ if (cur_s->block_chain)
+ free(cur_s->block_chain);
+ free(cur_s);
+ cur_s = next;
+ }
+
+ pthread_mutex_destroy(&lowspeed->lock);
+ free(lowspeed);
+}
+
+void en50221_app_lowspeed_clear_session(struct en50221_app_lowspeed *lowspeed,
+ uint16_t session_number)
+{
+ pthread_mutex_lock(&lowspeed->lock);
+ struct en50221_app_lowspeed_session *cur_s = lowspeed->sessions;
+ struct en50221_app_lowspeed_session *prev_s = NULL;
+ while (cur_s) {
+ if (cur_s->session_number == session_number) {
+ if (cur_s->block_chain)
+ free(cur_s->block_chain);
+ if (prev_s) {
+ prev_s->next = cur_s->next;
+ } else {
+ lowspeed->sessions = cur_s->next;
+ }
+ free(cur_s);
+ return;
+ }
+
+ prev_s = cur_s;
+ cur_s = cur_s->next;
+ }
+ pthread_mutex_unlock(&lowspeed->lock);
+}
+
+void en50221_app_lowspeed_register_command_callback(struct en50221_app_lowspeed *lowspeed,
+ en50221_app_lowspeed_command_callback callback,
+ void *arg)
+{
+ pthread_mutex_lock(&lowspeed->lock);
+ lowspeed->command_callback = callback;
+ lowspeed->command_callback_arg = arg;
+ pthread_mutex_unlock(&lowspeed->lock);
+}
+
+void en50221_app_lowspeed_register_send_callback(struct en50221_app_lowspeed *lowspeed,
+ en50221_app_lowspeed_send_callback callback,
+ void *arg)
+{
+ pthread_mutex_lock(&lowspeed->lock);
+ lowspeed->send_callback = callback;
+ lowspeed->send_callback_arg = arg;
+ pthread_mutex_unlock(&lowspeed->lock);
+}
+
+int en50221_app_lowspeed_send_comms_reply(struct en50221_app_lowspeed *lowspeed,
+ uint16_t session_number,
+ uint8_t comms_reply_id,
+ uint8_t return_value)
+{
+ uint8_t data[6];
+
+ data[0] = (TAG_COMMS_REPLY >> 16) & 0xFF;
+ data[1] = (TAG_COMMS_REPLY >> 8) & 0xFF;
+ data[2] = TAG_COMMS_REPLY & 0xFF;
+ data[3] = 2;
+ data[4] = comms_reply_id;
+ data[5] = return_value;
+ return lowspeed->funcs->send_data(lowspeed->funcs->arg,
+ session_number, data, 6);
+}
+
+int en50221_app_lowspeed_send_comms_data(struct en50221_app_lowspeed *lowspeed,
+ uint16_t session_number,
+ uint8_t phase_id,
+ uint32_t tx_data_length,
+ uint8_t * tx_data)
+{
+ uint8_t buf[10];
+
+ // the spec defines this limit
+ if (tx_data_length > 254) {
+ return -1;
+ }
+ // set up the tag
+ buf[0] = (TAG_COMMS_RECV_LAST >> 16) & 0xFF;
+ buf[1] = (TAG_COMMS_RECV_LAST >> 8) & 0xFF;
+ buf[2] = TAG_COMMS_RECV_LAST & 0xFF;
+
+ // encode the length field
+ int length_field_len;
+ if ((length_field_len = asn_1_encode(tx_data_length + 1, buf + 3, 3)) < 0) {
+ return -1;
+ }
+ // the phase_id
+ buf[3 + length_field_len] = phase_id;
+
+ // build the iovecs
+ struct iovec iov[2];
+ iov[0].iov_base = buf;
+ iov[0].iov_len = 3 + length_field_len + 1;
+ iov[1].iov_base = tx_data;
+ iov[1].iov_len = tx_data_length;
+
+ // create the data and send it
+ return lowspeed->funcs->send_datav(lowspeed->funcs->arg,
+ session_number, iov, 2);
+}
+
+int en50221_app_lowspeed_message(struct en50221_app_lowspeed *lowspeed,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint32_t resource_id,
+ uint8_t * data, uint32_t data_length)
+{
+ (void) resource_id;
+
+ // get the tag
+ if (data_length < 3) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
+
+ switch (tag) {
+ case TAG_COMMS_COMMAND:
+ return en50221_app_lowspeed_parse_command(lowspeed,
+ slot_id,
+ session_number,
+ data + 3,
+ data_length - 3);
+ case TAG_COMMS_SEND_LAST:
+ return en50221_app_lowspeed_parse_send(lowspeed, slot_id,
+ session_number, 1,
+ data + 3,
+ data_length - 3);
+ case TAG_COMMS_SEND_MORE:
+ return en50221_app_lowspeed_parse_send(lowspeed, slot_id,
+ session_number, 0,
+ data + 3,
+ data_length - 3);
+ }
+
+ print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
+ return -1;
+}
+
+
+
+static int en50221_app_lowspeed_parse_connect_on_channel(struct en50221_app_lowspeed_command *command,
+ uint8_t *data,
+ int data_length)
+{
+ if (data_length < 3) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ // check the tag
+ uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
+ if (tag != TAG_CONNECTION_DESCRIPTOR) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received bad CONNECT_ON_CHANNEL\n");
+ return -1;
+ }
+ data += 3;
+ data_length -= 3;
+
+ // parse the descriptor-length-field
+ uint16_t asn_data_length;
+ int length_field_len;
+ if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+ print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+ return -1;
+ }
+ data += length_field_len;
+ data_length -= length_field_len;
+
+ // check length field
+ if (asn_data_length > data_length) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ if (asn_data_length < 1) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ // get the descriptor type
+ command->u.connect_on_channel.descriptor_type = data[0];
+ data++;
+ data_length--;
+ asn_data_length--;
+
+ // deal with the descriptor itself
+ switch (command->u.connect_on_channel.descriptor_type) {
+ case CONNECTION_DESCRIPTOR_TYPE_TELEPHONE:
+ {
+ // get the raw descriptor and validate length
+ struct descriptor *d = (struct descriptor *) data;
+ if (asn_data_length < 2) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received short data\n");
+ return -1;
+ }
+ if (asn_data_length != (2 + d->len)) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received short data\n");
+ return -1;
+ }
+ if (d->tag != dtag_dvb_telephone) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received invalid telephone descriptor\n");
+ return -1;
+ }
+ // parse the telephone descriptor
+ command->u.connect_on_channel.descriptor.telephone = dvb_telephone_descriptor_codec(d);
+ if (command->u.connect_on_channel.descriptor.telephone == NULL) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received invalid telephone descriptor\n");
+ return -1;
+ }
+ data += 2 + d->len;
+ data_length -= 2 + d->len;
+ break;
+ }
+
+ case CONNECTION_DESCRIPTOR_TYPE_CABLE:
+ if (asn_data_length != 1) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received short data\n");
+ return -1;
+ }
+ command->u.connect_on_channel.descriptor.cable_channel_id = data[0];
+ data++;
+ data_length--;
+ break;
+ default:
+ print(LOG_LEVEL, ERROR, 1,
+ "Received unknown connection descriptor %02x\n",
+ command->u.connect_on_channel.descriptor_type);
+ return -1;
+ }
+
+ // parse the last bit
+ if (data_length != 2) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ command->u.connect_on_channel.retry_count = data[0];
+ command->u.connect_on_channel.timeout = data[1];
+
+ // ok
+ return 0;
+}
+
+static int en50221_app_lowspeed_parse_command(struct en50221_app_lowspeed *lowspeed,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint8_t * data,
+ uint32_t data_length)
+{
+ // first of all, decode the length field
+ uint16_t asn_data_length;
+ int length_field_len;
+ if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+ print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+ return -1;
+ }
+ // check it
+ if (asn_data_length < 1) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ if (asn_data_length > (data_length - length_field_len)) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ data += length_field_len;
+
+ // get command id
+ uint8_t command_id = data[0];
+ data++;
+ asn_data_length--;
+
+ // parse the command
+ struct en50221_app_lowspeed_command command;
+ switch (command_id) {
+ case COMMS_COMMAND_ID_CONNECT_ON_CHANNEL:
+ if (en50221_app_lowspeed_parse_connect_on_channel
+ (&command, data, asn_data_length)) {
+ return -1;
+ }
+ break;
+ case COMMS_COMMAND_ID_SET_PARAMS:
+ if (asn_data_length != 2) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received short data\n");
+ return -1;
+ }
+ command.u.set_params.buffer_size = data[0];
+ command.u.set_params.timeout = data[1];
+ break;
+ case COMMS_COMMAND_ID_GET_NEXT_BUFFER:
+ if (asn_data_length != 1) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received short data\n");
+ return -1;
+ }
+ command.u.get_next_buffer.phase_id = data[0];
+ break;
+
+ case COMMS_COMMAND_ID_DISCONNECT_ON_CHANNEL:
+ case COMMS_COMMAND_ID_ENQUIRE_STATUS:
+ break;
+
+ default:
+ print(LOG_LEVEL, ERROR, 1,
+ "Received unexpected command_id %02x\n", command_id);
+ return -1;
+ }
+
+ // tell the app
+ pthread_mutex_lock(&lowspeed->lock);
+ en50221_app_lowspeed_command_callback cb = lowspeed->command_callback;
+ void *cb_arg = lowspeed->command_callback_arg;
+ pthread_mutex_unlock(&lowspeed->lock);
+ if (cb) {
+ return cb(cb_arg, slot_id, session_number, command_id,
+ &command);
+ }
+ return 0;
+}
+
+static int en50221_app_lowspeed_parse_send(struct en50221_app_lowspeed *lowspeed,
+ uint8_t slot_id,
+ uint16_t session_number,
+ int more_last,
+ uint8_t *data,
+ uint32_t data_length)
+{
+ // first of all, decode the length field
+ uint16_t asn_data_length;
+ int length_field_len;
+ if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+ print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+ return -1;
+ }
+ // check it
+ if (asn_data_length > (data_length - length_field_len)) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ // skip over the length field
+ data += length_field_len;
+
+ // find previous session
+ pthread_mutex_lock(&lowspeed->lock);
+ struct en50221_app_lowspeed_session *cur_s = lowspeed->sessions;
+ while (cur_s) {
+ if (cur_s->session_number == session_number)
+ break;
+ cur_s = cur_s->next;
+ }
+
+ // more data is still to come
+ if (!more_last) {
+ // if there was no previous session, create one
+ if (cur_s == NULL) {
+ cur_s = malloc(sizeof(struct en50221_app_lowspeed_session));
+ if (cur_s == NULL) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Ran out of memory\n");
+ pthread_mutex_unlock(&lowspeed->lock);
+ return -1;
+ }
+ cur_s->session_number = session_number;
+ cur_s->block_chain = NULL;
+ cur_s->block_length = 0;
+ cur_s->next = lowspeed->sessions;
+ lowspeed->sessions = cur_s;
+ }
+ // append the data
+ uint8_t *new_data = realloc(cur_s->block_chain,
+ cur_s->block_length + asn_data_length);
+ if (new_data == NULL) {
+ print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+ pthread_mutex_unlock(&lowspeed->lock);
+ return -1;
+ }
+ memcpy(new_data + cur_s->block_length, data, asn_data_length);
+ cur_s->block_chain = new_data;
+ cur_s->block_length += asn_data_length;
+
+ // done
+ pthread_mutex_unlock(&lowspeed->lock);
+ return 0;
+ }
+ // we hit the last of a possible chain of fragments
+ int do_free = 0;
+ if (cur_s != NULL) {
+ // we have a preceding fragment - need to append
+ uint8_t *new_data = realloc(cur_s->block_chain,
+ cur_s->block_length + asn_data_length);
+ if (new_data == NULL) {
+ print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+ pthread_mutex_unlock(&lowspeed->lock);
+ return -1;
+ }
+ memcpy(new_data + cur_s->block_length, data, asn_data_length);
+ asn_data_length = cur_s->block_length + asn_data_length;
+ data = new_data;
+ cur_s->block_chain = NULL;
+ cur_s->block_length = 0;
+ do_free = 1;
+ }
+ // check the reassembled data length
+ if (asn_data_length < 1) {
+ pthread_mutex_unlock(&lowspeed->lock);
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ if (do_free)
+ free(data);
+ return -1;
+ }
+ // now, parse the data
+ uint8_t phase_id = data[0];
+
+ // tell the app
+ en50221_app_lowspeed_send_callback cb = lowspeed->send_callback;
+ void *cb_arg = lowspeed->send_callback_arg;
+ pthread_mutex_unlock(&lowspeed->lock);
+ int cbstatus = 0;
+ if (cb) {
+ cbstatus =
+ cb(cb_arg, slot_id, session_number, phase_id, data + 1, asn_data_length - 1);
+ }
+ // done
+ if (do_free)
+ free(data);
+ return cbstatus;
+}
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