module-camd33.c

#define MODULE_LOG_PREFIX "camd33"

#include "globals.h"
#ifdef MODULE_CAMD33
#include "ncam-aes.h"
#include "ncam-client.h"
#include "ncam-ecm.h"
#include "ncam-emm.h"
#include "ncam-net.h"
#include "ncam-string.h"

#define REQ_SIZE 4

static int32_t camd33_send(uint8_t *buf, int32_t ml)
{
	int32_t l;

	if(!cur_client()->pfd)
	{
		return (-1);
	}

	l = boundary(4, ml);
	memset(buf + ml, 0, l - ml);
	cs_log_dump_dbg(D_CLIENT, buf, l, "send %d bytes to client", l);

	if(cur_client()->crypted)
	{
		aes_encrypt_idx(cur_client()->aes_keys, buf, l);
	}

	return (send(cur_client()->pfd, buf, l, 0));
}

static int32_t camd33_recv(struct s_client *client, uint8_t *buf, int32_t l)
{
	int32_t n;

	if(!client->pfd)
	{
		return (-1);
	}

	if((n = cs_recv(client->pfd, buf, l, 0)) > 0)
	{
		client->last = time((time_t *)0);
		if(client->crypted)
		{
			aes_encrypt_idx(cur_client()->aes_keys, buf, n);
		}
	}
	cs_log_dump_dbg(D_CLIENT, buf, n, "received %d bytes from client", n);

	return (n);
}

static void camd33_request_emm(void)
{
	uint8_t mbuf[20];
	struct s_reader *aureader = NULL, *rdr = NULL;

	// TODO: just take the first reader in list
	LL_ITER itr = ll_iter_create(cur_client()->aureader_list);
	while((rdr = ll_iter_next(&itr)))
	{
		aureader = rdr;
		break;
	}

	if(!aureader)
	{
		return;
	}

	if(aureader->hexserial[0])
	{
		cs_log("%s emm-request sent (reader=%s, caid=%04X, auprovid=%06X)",
				username(cur_client()), aureader->label, aureader->caid,
				aureader->auprovid ? aureader->auprovid : b2i(4, aureader->prid[0]));

		mbuf[0] = 0;
		mbuf[1] = aureader->caid >> 8;
		mbuf[2] = aureader->caid & 0xff;

		memcpy(mbuf + 3, aureader->hexserial, 4);
		memcpy(mbuf + 7, &aureader->prid[0][1], 3);
		memcpy(mbuf + 10, &aureader->prid[2][1], 3);
		camd33_send(mbuf, 13);
	}
}

static void camd33_auth_client(uint8_t *camdbug)
{
	int32_t i, rc;
	uint8_t *usr = NULL, *pwd = NULL;
	struct s_auth *account;
	uint8_t mbuf[1024];
	struct s_client *cl = cur_client();

	cl->crypted = cfg.c33_crypted;
	if(cl->crypted)
	{
		cl->crypted = !check_ip(cfg.c33_plain, cl->ip);
	}

	if(cl->crypted)
	{
		if (!aes_set_key_alloc(&cl->aes_keys, (char *)cfg.c33_key))
		{
			cs_disconnect_client(cl);
			return;
		}
	}

	mbuf[0] = 0;
	camd33_send(mbuf, 1); // send login-request

	for(rc = 0, camdbug[0] = 0, mbuf[0] = 1; (rc < 2) && (mbuf[0]); rc++)
	{
		i = process_input(mbuf, sizeof(mbuf), 1);
		if((i > 0) && (!mbuf[0]))
		{
			usr = mbuf + 1;
			pwd = usr + strlen((char *)usr) + 2;
		}
		else
		{
			memcpy(camdbug + 1, mbuf, camdbug[0] = i);
		}
	}

	for(rc = -1, account = cfg.account; (usr) && (account) && (rc < 0); account = account->next)
	{
		if(streq((char *)usr, account->usr) && streq((char *)pwd, account->pwd))
		{
			rc = cs_auth_client(cl, account, NULL);
		}
	}

	if(!rc)
	{
		camd33_request_emm();
	}
	else
	{
		if(rc < 0)
		{
			cs_auth_client(cl, 0, usr ? "invalid account" : "no user given");
		}
		cs_disconnect_client(cl);
	}
}

static void camd33_send_dcw(struct s_client *UNUSED(client), ECM_REQUEST *er)
{
	uint8_t mbuf[128];

	mbuf[0] = 2;
	memcpy(mbuf + 1, &er->msgid, 4); // get pin
	memcpy(mbuf + 5, er->cw, 16);
	camd33_send(mbuf, 21);

	if(!cfg.c33_passive)
	{
		camd33_request_emm();
	}
}

static void camd33_process_ecm(uint8_t *buf, int32_t l)
{
	ECM_REQUEST *er;

	if(l < 7)
	{
		return;
	}

	if(!(er = get_ecmtask()))
	{
		return;
	}

	memcpy(&er->msgid, buf + 3, 4); // save pin
	er->ecmlen = l - 7;

	if(er->ecmlen < 0 || er->ecmlen > MAX_ECM_SIZE)
	{
		NULLFREE(er);
		return;
	}

	er->caid = b2i(2, buf + 1);
	memcpy(er->ecm , buf + 7, er->ecmlen);
	get_cw(cur_client(), er);
}

static void camd33_process_emm(uint8_t *buf, int32_t l)
{
	EMM_PACKET epg;

	if(l < 7)
	{
		return;
	}

	memset(&epg, 0, sizeof(epg));
	epg.emmlen = l - 7;

	if(epg.emmlen < 3 || epg.emmlen > MAX_EMM_SIZE)
	{
		return;
	}

	memcpy(epg.caid, buf + 1, 2);
	memcpy(epg.hexserial, buf + 3, 4);
	memcpy(epg.emm, buf + 7, epg.emmlen);
	do_emm(cur_client(), &epg);
}

static void *camd33_server(struct s_client *UNUSED(client), uint8_t *mbuf, int32_t n)
{
	switch(mbuf[0])
	{
		case 2:
			camd33_process_ecm(mbuf, n);
			break;

		case 3:
			camd33_process_emm(mbuf, n);
			break;

		default:
			cs_log_dbg(D_CLIENT, "unknown command!");
	}

	return NULL;
}

static void camd33_server_init(struct s_client *UNUSED(client))
{
	uint8_t camdbug[256];

	camd33_auth_client(camdbug);
}

void module_camd33(struct s_module *ph)
{
	cfg.c33_crypted = array_has_nonzero_byte(cfg.c33_key, sizeof(cfg.c33_key));
	ph->ptab.nports = 1;
	ph->ptab.ports[0].s_port = cfg.c33_port;
	ph->desc = "camd33";
	ph->type = MOD_CONN_TCP;
	ph->large_ecm_support = 1;
	ph->listenertype = LIS_CAMD33TCP;
	IP_ASSIGN(ph->s_ip, cfg.c33_srvip);
	ph->s_handler = camd33_server;
	ph->s_init = camd33_server_init;
	ph->recv = camd33_recv;
	ph->send_dcw = camd33_send_dcw;
	ph->num = R_CAMD33;
}
#endif