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/*
* CAMD communications
* Copyright (C) 2011 Unix Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 (COPYING file) for more details.
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include "libfuncs/libfuncs.h"
#include "data.h"
#include "csa.h"
#include "util.h"
#include "camd.h"
#include "notify.h"
int ai_family = AF_UNSPEC;
extern int keep_running;
static uint8_t invalid_cw[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
int connect_client(int socktype, const char *hostname, const char *service) {
struct addrinfo hints, *res;
int n;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = ai_family;
hints.ai_socktype = socktype;
ts_LOGf("CAM | Connecting to server %s port %s\n", hostname, service);
n = getaddrinfo(hostname, service, &hints, &res);
if (n < 0) {
ts_LOGf("CAM | ERROR: getaddrinfo(%s): %s\n", hostname, gai_strerror(n));
return -1;
}
int sockfd = -1;
struct addrinfo *ressave = res;
char str_addr[INET6_ADDRSTRLEN] = { 0 };
while (res) {
sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sockfd > -1) {
my_inet_ntop(res->ai_family, res->ai_addr, str_addr, sizeof(str_addr));
if (do_connect(sockfd, res->ai_addr, res->ai_addrlen, 1000) < 0) {
ts_LOGf("CAM | Error connecting to server %s port %s (addr=%s) | %s\n",
hostname, service, str_addr, strerror(errno));
close(sockfd);
sockfd = -1;
} else {
break; // connected
}
} else {
ts_LOGf("CAM | Could not create socket: %s\n", strerror(errno));
sleep(1);
return -1;
}
res = res->ai_next;
}
freeaddrinfo(ressave);
if (socktype == SOCK_STREAM) {
int flag = 1;
setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(int));
}
ts_LOGf("CAM | Connected to server %s port %s (addr=%s fd=%d).\n",
hostname, service, str_addr, sockfd);
return sockfd;
}
static inline void camd_reconnect(struct camd *c) {
if (!keep_running)
return;
if (c->no_reconnect)
return;
c->ops.reconnect(c);
}
void camd_set_cw(struct ts *ts, uint8_t *new_cw, int check_validity) {
struct camd *c = &ts->camd;
c->ecm_recv_errors = 0;
gettimeofday(&c->key->ts_keyset, NULL);
c->key->ts = c->key->ts_keyset.tv_sec;
ts->cw_last_warn = c->key->ts;
if (!check_validity || memcmp(new_cw, invalid_cw, 8) != 0)
csa_set_even_cw(c->key->csakey, new_cw);
if (!check_validity || memcmp(new_cw + 8, invalid_cw, 8) != 0)
csa_set_odd_cw(c->key->csakey, new_cw + 8);
}
static int camd_recv_cw(struct ts *ts) {
struct camd *c = &ts->camd;
struct timeval tv1, tv2, last_ts_keyset;
uint16_t ca_id = 0;
uint16_t idx = 0;
int ret;
gettimeofday(&tv1, NULL);
ret = c->ops.get_cw(c, &ca_id, &idx, c->key->cw);
gettimeofday(&tv2, NULL);
if (!keep_running)
return 0;
if (ret <= 0) {
if (ret == -1) { // Fatal error it is better to reconnect to server.
ts_LOGf("ERR | No code word has been received (ret = %d)\n", ret);
camd_reconnect(c);
}
c->ecm_recv_errors++;
if (c->ecm_recv_errors >= ECM_RECV_ERRORS_LIMIT) {
c->key->is_valid_cw = 0;
memset(c->key->cw, 0, 16); // Invalid CW
}
usleep(10000);
return 0;
}
char cw_dump[16 * 6];
ts_hex_dump_buf(cw_dump, 16 * 6, c->key->cw, 16, 0);
int valid_cw = memcmp(c->key->cw, invalid_cw, 16) != 0;
if (!c->key->is_valid_cw && valid_cw) {
ts_LOGf("CW | OK: Valid code word was received.\n");
notify(ts, "CODE_WORD_OK", "Valid code word was received.");
}
c->key->is_valid_cw = valid_cw;
// At first ts_keyset is not initialized
last_ts_keyset = c->key->ts_keyset;
if (c->key->is_valid_cw)
camd_set_cw(ts, c->key->cw, 1);
if (ts->ecm_cw_log) {
ts_LOGf("CW | SID 0x%04x CAID: 0x%04x CW_recv: %5llu ms LastKey: %5llu ms Data: %s\n",
ts->service_id,
ca_id,
timeval_diff_msec(&tv1, &tv2),
timeval_diff_msec(&last_ts_keyset, &tv2),
cw_dump );
}
return 1;
}
#undef ERR
static int camd_send_ecm(struct ts *ts, struct camd_msg *msg) {
struct camd *c = &ts->camd;
int ret = c->ops.do_ecm(c, msg);
if (ret <= 0) {
ts_LOGf("ERR | Error sending ecm packet, reconnecting to camd.\n");
ts->is_cw_error = 1;
camd_reconnect(c);
return ret;
}
ret = camd_recv_cw(ts);
if (ret < 1) {
time_t now = time(NULL);
ts->is_cw_error = 1;
if (ts->key.ts && now - ts->key.ts > KEY_VALID_TIME) {
if (c->key->is_valid_cw) {
notify(ts, "NO_CODE_WORD", "No code word was set in %ld sec. Decryption is disabled.",
now - ts->key.ts);
ts_LOGf("CW | *ERR* No valid code word was received in %ld seconds. Decryption is disabled.\n",
now - ts->key.ts);
ts->cw_last_warn = time(NULL);
ts->cw_next_warn = ts->cw_last_warn + ts->cw_warn_sec;
ts->cw_next_warn -= now - ts->key.ts;
if (ts->cw_next_warn <= ts->cw_last_warn)
ts->cw_next_warn = ts->cw_last_warn + ts->cw_warn_sec;
}
c->key->is_valid_cw = 0;
}
return 0;
}
return ret;
}
static int camd_send_emm(struct ts *ts, struct camd_msg *msg) {
struct camd *c = &ts->camd;
int ret = c->ops.do_emm(c, msg);
if (ret < 1) {
c->emm_recv_errors++;
if (c->check_emm_errors || c->emm_recv_errors >= EMM_RECV_ERRORS_LIMIT) {
ts_LOGf("ERR | Error sending emm packet, reconnecting to camd.\n");
camd_reconnect(c);
c->emm_recv_errors = 0;
}
} else {
c->emm_recv_errors = 0;
}
return ret;
}
static void camd_do_msg(struct camd_msg *msg) {
if (!keep_running)
goto OUT;
if (msg->type == EMM_MSG) {
msg->ts->emm_seen_count++;
if (camd_send_emm(msg->ts, msg) > 0)
msg->ts->emm_processed_count++;
}
if (msg->type == ECM_MSG) {
msg->ts->ecm_seen_count++;
if (camd_send_ecm(msg->ts, msg) > 0)
msg->ts->ecm_processed_count++;
}
OUT:
camd_msg_free(&msg);
}
struct camd_msg *camd_msg_alloc(enum msg_type msg_type, uint16_t ca_id, uint16_t service_id, uint8_t *data, uint8_t data_len) {
struct camd_msg *c = calloc(1, sizeof(struct camd_msg));
c->type = msg_type;
c->ca_id = ca_id;
c->service_id = service_id;
c->data_len = data_len;
memcpy(c->data, data, data_len);
return c;
}
void camd_msg_free(struct camd_msg **pmsg) {
struct camd_msg *m = *pmsg;
if (m) {
FREE(*pmsg);
}
}
static void *camd_thread(void *in_ts) {
struct ts *ts = in_ts;
set_thread_name("tsdec-camd");
while (keep_running) {
struct camd_msg *msg;
void *req = queue_get(ts->camd.req_queue); // Waits...
if (ts->camd_stop)
break;
if (!req)
continue;
msg = queue_get_nowait(ts->camd.ecm_queue);
if (!msg)
msg = queue_get_nowait(ts->camd.emm_queue);
if (!msg)
continue;
camd_do_msg(msg);
if (ts->camd.ecm_queue->items >= ECM_QUEUE_HARD_LIMIT) {
ts_LOGf("WRN | Too much items (%d) in ECM queue, dropping the oldest.\n", ts->camd.ecm_queue->items);
while(ts->camd.ecm_queue->items >= ECM_QUEUE_SOFT_LIMIT) {
msg = queue_get_nowait(ts->camd.ecm_queue);
camd_msg_free(&msg);
}
}
if (ts->camd.emm_queue->items >= EMM_QUEUE_HARD_LIMIT) {
ts_LOGf("WRN | Too much items (%d) in EMM queue, dropping the oldest.%s\n",
ts->camd.emm_queue->items, ts->camd.ops.proto == CAMD_NEWCAMD ?
" Consider switching to cs378x protocol!" : "");
while(ts->camd.emm_queue->items >= EMM_QUEUE_SOFT_LIMIT) {
msg = queue_get_nowait(ts->camd.emm_queue);
camd_msg_free(&msg);
}
}
// Flush request queue
while(ts->camd.req_queue->items > ts->camd.emm_queue->items + ts->camd.ecm_queue->items) {
queue_get_nowait(ts->camd.req_queue);
}
}
// Flush ECM queue
while (ts->camd.ecm_queue->items) {
struct camd_msg *msg = queue_get_nowait(ts->camd.ecm_queue);
camd_msg_free(&msg);
}
// Flush EMM queue
while (ts->camd.emm_queue->items) {
struct camd_msg *msg = queue_get_nowait(ts->camd.emm_queue);
camd_msg_free(&msg);
}
pthread_exit(EXIT_SUCCESS);
}
void camd_process_packet(struct ts *ts, struct camd_msg *msg) {
if (!msg)
return;
if (ts->camd.constant_codeword)
return;
msg->ts = ts;
if (ts->camd.thread) {
if (msg->type == EMM_MSG)
queue_add(ts->camd.emm_queue, msg);
if (msg->type == ECM_MSG)
queue_add(ts->camd.ecm_queue, msg);
queue_add(ts->camd.req_queue, msg);
} else {
camd_do_msg(msg);
}
}
void camd_start(struct ts *ts) {
struct camd *c = &ts->camd;
if (c->constant_codeword)
return;
c->ops.connect(c);
// The input is not file, process messages using async thread
if (ts->threaded) {
c->req_queue = queue_new();
c->ecm_queue = queue_new();
c->emm_queue = queue_new();
pthread_create(&c->thread, &ts->thread_attr , &camd_thread, ts);
}
}
void camd_stop(struct ts *ts) {
struct camd *c = &ts->camd;
if (c->constant_codeword)
return;
ts->camd_stop = 1;
if (c->thread) {
queue_add(c->req_queue, NULL);
queue_wakeup(c->req_queue);
pthread_join(c->thread, NULL);
queue_free(&c->req_queue);
queue_free(&c->ecm_queue);
queue_free(&c->emm_queue);
c->thread = 0;
}
c->ops.disconnect(c);
}
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