diff options
Diffstat (limited to 'lib/libdvben50221/en50221_app_auth.c')
| -rw-r--r-- | lib/libdvben50221/en50221_app_auth.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/lib/libdvben50221/en50221_app_auth.c b/lib/libdvben50221/en50221_app_auth.c new file mode 100644 index 0000000..a8902c1 --- /dev/null +++ b/lib/libdvben50221/en50221_app_auth.c @@ -0,0 +1,180 @@ +/* + 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_auth.h" +#include "en50221_app_tags.h" +#include "asn_1.h" + +struct en50221_app_auth { + struct en50221_app_send_functions *funcs; + + en50221_app_auth_request_callback callback; + void *callback_arg; + + pthread_mutex_t lock; +}; + +static int en50221_app_auth_parse_request(struct en50221_app_auth *private, + uint8_t slot_id, + uint16_t session_number, + uint8_t * data, + uint32_t data_length); + + +struct en50221_app_auth *en50221_app_auth_create(struct en50221_app_send_functions *funcs) +{ + struct en50221_app_auth *auth = NULL; + + // create structure and set it up + auth = malloc(sizeof(struct en50221_app_auth)); + if (auth == NULL) { + return NULL; + } + auth->funcs = funcs; + auth->callback = NULL; + + pthread_mutex_init(&auth->lock, NULL); + + // done + return auth; +} + +void en50221_app_auth_destroy(struct en50221_app_auth *auth) +{ + pthread_mutex_destroy(&auth->lock); + free(auth); +} + +void en50221_app_auth_register_request_callback(struct en50221_app_auth *auth, + en50221_app_auth_request_callback callback, void *arg) +{ + pthread_mutex_lock(&auth->lock); + auth->callback = callback; + auth->callback_arg = arg; + pthread_mutex_unlock(&auth->lock); +} + +int en50221_app_auth_send(struct en50221_app_auth *auth, + uint16_t session_number, + uint16_t auth_protocol_id, uint8_t * auth_data, + uint32_t auth_data_length) +{ + uint8_t buf[10]; + + // the header + buf[0] = (TAG_AUTH_RESP >> 16) & 0xFF; + buf[1] = (TAG_AUTH_RESP >> 8) & 0xFF; + buf[2] = TAG_AUTH_RESP & 0xFF; + + // encode the length field + int length_field_len; + if ((length_field_len = asn_1_encode(auth_data_length + 2, buf + 3, 3)) < 0) { + return -1; + } + // the phase_id + buf[3 + length_field_len] = auth_protocol_id >> 8; + buf[3 + length_field_len + 1] = auth_protocol_id; + + // build the iovecs + struct iovec iov[2]; + iov[0].iov_base = buf; + iov[0].iov_len = 3 + length_field_len + 2; + iov[1].iov_base = auth_data; + iov[1].iov_len = auth_data_length; + + // sendit + return auth->funcs->send_datav(auth->funcs->arg, session_number, + iov, 2); +} + +int en50221_app_auth_message(struct en50221_app_auth *auth, + 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_AUTH_REQ: + return en50221_app_auth_parse_request(auth, slot_id, + session_number, + data + 3, + data_length - 3); + } + + print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag); + return -1; +} + + + +static int en50221_app_auth_parse_request(struct en50221_app_auth *auth, + 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 < 2) { + 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; + } + uint8_t *auth_data = data + length_field_len; + + // process it + uint16_t auth_protocol_id = (auth_data[0] << 8) | auth_data[1]; + + // tell the app + pthread_mutex_lock(&auth->lock); + en50221_app_auth_request_callback cb = auth->callback; + void *cb_arg = auth->callback_arg; + pthread_mutex_unlock(&auth->lock); + if (cb) { + return cb(cb_arg, slot_id, session_number, + auth_protocol_id, auth_data + 2, + asn_data_length - 2); + } + return 0; +} |