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/*
* cs378x protocol
* 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 <openssl/aes.h>
#include <openssl/md5.h>
#include "libfuncs/libfuncs.h"
#include "data.h"
#include "util.h"
#include "camd.h"
static int cs378x_connect(struct camd *c) {
if (c->server_fd < 0)
c->server_fd = connect_client(SOCK_STREAM, c->hostname, c->service);
return c->server_fd;
}
static void cs378x_disconnect(struct camd *c) {
shutdown_fd(&c->server_fd);
}
static int cs378x_reconnect(struct camd *c) {
cs378x_disconnect(c);
return cs378x_connect(c);
}
static int cs378x_recv(struct camd *c, uint8_t *data, int *data_len) {
int i;
// Read AUTH token
ssize_t r = fdread(c->server_fd, (char *)data, 4);
if (r < 4)
return -1;
uint32_t auth_token = (((data[0] << 24) | (data[1] << 16) | (data[2]<<8) | data[3]) & 0xffffffffL);
if (auth_token != c->cs378x.auth_token) {
ts_LOGf("ERR | [%s] recv auth 0x%08x != camd_auth 0x%08x\n",
c->ops.ident, auth_token, c->cs378x.auth_token);
}
*data_len = 256;
for (i = 0; i < *data_len; i += 16) { // Read and decrypt payload
fdread(c->server_fd, (char *)data + i, 16);
AES_decrypt(data + i, data + i, &c->cs378x.aes_decrypt_key);
if (i == 0)
*data_len = boundary(4, data[1] + 20); // Initialize real data length
}
return *data_len;
}
static int cs378x_send_buf(struct camd *c, int data_len) {
int i;
unsigned char dump[16];
if (cs378x_connect(c) < 0)
return -1;
// Prepare auth token (only once)
if (!c->cs378x.auth_token) {
c->cs378x.auth_token = crc32(0L, MD5((unsigned char *)c->user, strlen(c->user), dump), 16);
MD5((unsigned char *)c->pass, strlen(c->pass), dump);
AES_set_encrypt_key(dump, 128, &c->cs378x.aes_encrypt_key);
AES_set_decrypt_key(dump, 128, &c->cs378x.aes_decrypt_key);
}
uint8_t *bdata = c->cs378x.buf + 4; // Leave space for auth token
memmove(bdata, c->cs378x.buf, data_len); // Move data
init_4b(c->cs378x.auth_token, c->cs378x.buf); // Put authentication token
for (i = 0; i < data_len; i += 16) // Encrypt payload
AES_encrypt(bdata + i, bdata + i, &c->cs378x.aes_encrypt_key);
return fdwrite(c->server_fd, (char *)c->cs378x.buf, data_len + 4);
}
static void cs378x_buf_init(struct camd *c, uint8_t *data, int data_len) {
memset(c->cs378x.buf, 0, CAMD35_HDR_LEN); // Reset header
memset(c->cs378x.buf + CAMD35_HDR_LEN, 0xff, CAMD35_BUF_LEN - CAMD35_HDR_LEN); // Reset data
c->cs378x.buf[1] = data_len; // Data length
init_4b(crc32(0L, data, data_len), c->cs378x.buf + 4); // Data CRC is at buf[4]
memcpy(c->cs378x.buf + CAMD35_HDR_LEN, data, data_len); // Copy data to buf
}
static int cs378x_do_ecm(struct camd *c, struct camd_msg *msg) {
int to_send = boundary(4, CAMD35_HDR_LEN + msg->data_len);
cs378x_buf_init(c, msg->data, (int)msg->data_len);
c->cs378x.msg_id++;
c->cs378x.buf[0] = 0x00; // CMD ECM request
init_2b(msg->service_id , c->cs378x.buf + 8);
init_2b(msg->ca_id , c->cs378x.buf + 10);
init_4b(0 , c->cs378x.buf + 12); // Provider ID
init_2b(c->cs378x.msg_id, c->cs378x.buf + 16);
c->cs378x.buf[18] = 0xff;
c->cs378x.buf[19] = 0xff;
return cs378x_send_buf(c, to_send);
}
static int cs378x_do_emm(struct camd *c, struct camd_msg *msg) {
int to_send = boundary(4, CAMD35_HDR_LEN + msg->data_len);
cs378x_buf_init(c, msg->data, (int)msg->data_len);
c->cs378x.buf[0] = 0x06; // CMD incomming EMM
init_2b(msg->ca_id , c->cs378x.buf + 10);
init_4b(0 , c->cs378x.buf + 12); // Provider ID
return cs378x_send_buf(c, to_send);
}
static int cs378x_get_cw(struct camd *c, uint16_t *ca_id, uint16_t *idx, uint8_t *cw) {
uint8_t *data = c->cs378x.buf;
int data_len = 0;
int ret = 0;
READ:
ret = cs378x_recv(c, data, &data_len);
if (ret < 0) // Fatal error
return -1;
// EMM request, ignore it. Sometimes OSCAM sends two EMM requests after CW
if (data[0] == 0x05)
goto READ;
if (data[0] != 0x01) {
ts_LOGf("ERR | [%s] Unexpected server response on code word request (ret data[0] == 0x%02x /%s/)\n",
c->ops.ident,
data[0],
data[0] == 0x08 ? "No card" :
data[0] == 0x44 ? "No code word found" : "Unknown err");
return 0;
}
if (data_len < 48) {
ts_LOGf("ERR | [%s] Code word packet len != 48 (%d)\n", c->ops.ident, data_len);
return 0;
}
if (data[1] < 0x10) {
ts_LOGf("ERR | [%s] Code word len != 16 (%d)\n", c->ops.ident, data[1]);
return 0;
}
*ca_id = (data[10] << 8) | data[11];
*idx = (data[16] << 8) | data[17];
memcpy(cw, data + 20, 16);
return 1;
}
void camd_proto_cs378x(struct camd_ops *ops) {
ops->ident = "cs378x";
ops->proto = CAMD_CS378X;
ops->connect = cs378x_connect;
ops->disconnect = cs378x_disconnect;
ops->reconnect = cs378x_reconnect;
ops->do_emm = cs378x_do_emm;
ops->do_ecm = cs378x_do_ecm;
ops->get_cw = cs378x_get_cw;
}
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