module-csp.c

#define MODULE_LOG_PREFIX "csp"

/*
 * module-csp.c
 *
 *  Created on: 20.12.2011
 *      Author: Corsair
 */

#include "globals.h"

#ifdef CS_CACHEEX

#include "module-cacheex.h"
#include "ncam-cache.h"
#include "ncam-ecm.h"
#include "ncam-net.h"
#include "ncam-string.h"
#include "ncam-time.h"

#define TYPE_REQUEST   1
#define TYPE_REPLY     2
#define TYPE_PINGREQ   3
#define TYPE_PINGRPL   4
#define TYPE_RESENDREQ 5

#define FAKE_ONID      0xFFFF
#define FAKE_TAG       0x80

#define PING_INTVL     4

static void *csp_server(struct s_client *client __attribute__((unused)), uint8_t *mbuf __attribute__((unused)), int32_t n __attribute__((unused)))
{
	return NULL;
}

static int32_t csp_send_ping(struct s_client *cl, uint32_t now)
{
	uint8_t buf[13] = {0};

	buf[0] = TYPE_PINGREQ;
	i2b_buf(4, now, buf + 1);
	i2b_buf(4, cfg.csp_port, buf + 9);

	int32_t status = sendto(cl->udp_fd, buf, sizeof(buf), 0, (struct sockaddr *) &cl->udp_sa, cl->udp_sa_len);

	cl->lastecm = time((time_t *) 0); // use this to indicate last ping sent for now
	return status;
}

static int32_t csp_cache_push_out(struct s_client *cl, struct ecm_request_t *er)
{
	int8_t rc = (er->rc < E_NOTFOUND) ? E_FOUND : er->rc;
	uint8_t size = 0, type;

	switch(rc)
	{
	case E_FOUND: // we have the cw
		size = 29;
		type = TYPE_REPLY;
		break;
	case E_UNHANDLED: // request pending - not yet used?
		size = 12;
		type = TYPE_REQUEST;
		break;
	default:
		return -1;

	}

	uint8_t *buf;
	if(!cs_malloc(&buf, size)) { return -1; }

	uint16_t onid = er->onid;
	if(onid == 0) { onid = FAKE_ONID; }
	uint8_t tag = er->ecm[0];
	if(tag != 0x80 && tag != 0x81) { tag = FAKE_TAG; }

	buf[0] = type;
	buf[1] = tag;
	i2b_buf(2, er->srvid, buf + 2);
	i2b_buf(2, onid, buf + 4);
	i2b_buf(2, er->caid, buf + 6);
	i2b_buf(4, er->csp_hash, buf + 8);

	if(rc == E_FOUND)
	{
		buf[12] = tag;
		memcpy(buf + 13, er->cw, sizeof(er->cw));
	}

	struct timeb tpe;
	cs_ftime(&tpe);

	if(tpe.time - cl->lastecm > PING_INTVL) { csp_send_ping(cl, 1000 * tpe.time + tpe.millitm); }

	cs_log_dump_dbg(D_TRACE, buf, size, "pushing cache update to csp onid=%04X caid=%04X srvid=%04X hash=%08X (tag: %02X)", onid, er->caid, er->srvid, er->csp_hash, tag);

	/*
	struct SOCKADDR peer_sa = {0};
	SIN_GET_FAMILY(peer_sa) = SIN_GET_FAMILY(cl->udp_sa);
	cs_inet_addr("127.0.0.1", &SIN_GET_ADDR(peer_sa));
	SIN_GET_PORT(peer_sa) = htons(12346);
	int32_t status = sendto(cl->udp_fd, buf, size, 0, (struct sockaddr *)&peer_sa, sizeof(peer_sa));
	 */

	int32_t status = sendto(cl->udp_fd, buf, size, 0, (struct sockaddr *) &cl->udp_sa, cl->udp_sa_len);
	NULLFREE(buf);
	return status;
}

static uint8_t parse_request(struct ecm_request_t *er, uint8_t *buf)
{
	uint8_t commandTag = buf[0]; // first ecm byte indicating odd or even (0x80 or 0x81)
	uint16_t srvid = b2i(2, buf + 1);
	uint16_t onid = b2i(2, buf + 3);
	uint16_t caid = b2i(2, buf + 5);
	uint32_t hash = b2i(4, buf + 7);

	er->caid = caid;
	er->onid = onid;
	er->srvid = srvid;
	er->csp_hash = hash;
	er->ecm[0] = commandTag;
	er->from_csp = 1;

	return commandTag;
}

static int32_t csp_recv(struct s_client *client, uint8_t *buf, int32_t l)
{
	int32_t rs = 0;
	if(!client->udp_fd) { return (-9); }
	if(client->is_udp && client->typ == 'c')
	{
		rs = recv_from_udpipe(buf); // whats this?
	}
	else
	{
		rs = cs_recv(client->udp_fd, buf, client->is_udp ? l : 36, 0);
	}
	//cs_log_dump_dbg(D_TRACE, buf, rs, "received %d bytes from csp", rs);

	uint8_t type = buf[0]; // TYPE

	switch(type)
	{

	case TYPE_REPLY: // request hash + reply received:
		if(rs >= 29)
		{
			ECM_REQUEST *er = get_ecmtask();
			if(!er) { return -1; }

			uint8_t commandTag = parse_request(er, buf + 1);
			uint8_t rplTag = buf[12];

			er->rc = E_FOUND;

			if(chk_csp_ctab(er, &cfg.csp.filter_caidtab))
			{
				memcpy(er->cw, buf + 13, sizeof(er->cw));
				uint8_t orgname[32] = {0};
				if(rs >= 31)
				{
					// origin connector name included
					uint16_t namelen = (buf[29] << 8) | buf[30];
					if(namelen > sizeof(orgname)) { namelen = sizeof(orgname); }
					memcpy(orgname, buf + 31, namelen);
				}
				cs_log_dump_dbg(D_TRACE, er->cw, sizeof(er->cw), "received cw from csp onid=%04X caid=%04X srvid=%04X hash=%08X (org connector: %s, tags: %02X/%02X)", er->onid, er->caid, er->srvid, er->csp_hash, orgname, commandTag, rplTag);
				cacheex_add_to_cache_from_csp(client, er);
			}
			else { NULLFREE(er); }
		}
		break;

	case TYPE_REQUEST: // pending request notification hash received
		if(rs == 12)    // ignore requests for arbitration (csp "pre-requests", size 20)
		{
			ECM_REQUEST *er = get_ecmtask();
			if(!er) { return -1; }

			uint8_t commandTag = parse_request(er, buf + 1);

			er->rc = E_UNHANDLED;

			if(chk_csp_ctab(er, &cfg.csp.filter_caidtab) && cfg.csp.allow_request)
			{
				cs_log_dump_dbg(D_TRACE, buf, l, "received ecm request from csp onid=%04X caid=%04X srvid=%04X hash=%08X (tag: %02X)", er->onid, er->caid, er->srvid, er->csp_hash, commandTag);
				cacheex_add_to_cache_from_csp(client, er);
			}
			else { NULLFREE(er); }
		}
		break;

	case TYPE_PINGREQ:
		if(rs >= 13)
		{
			client->last = time((time_t *) 0);
			uint32_t port = b2i(4, buf + 9);
			SIN_GET_PORT(client->udp_sa) = htons(port);

			uint8_t pingrpl[9];
			pingrpl[0] = TYPE_PINGRPL;
			memcpy(pingrpl + 1, buf + 1, 8);
			int32_t status = sendto(client->udp_fd, pingrpl, sizeof(pingrpl), 0, (struct sockaddr *) &client->udp_sa, client->udp_sa_len);
			cs_log_dbg(D_TRACE, "received ping from cache peer: %s:%d (replied: %d)", cs_inet_ntoa(SIN_GET_ADDR(client->udp_sa)), port, status);
		}
		break;

	case TYPE_PINGRPL:
		if(rs >= 9)
		{
			struct timeb tpe;
			cs_ftime(&tpe);
			uint32_t ping = b2i(4, buf + 1);
			uint32_t now = tpe.time * 1000 + tpe.millitm;
			cs_log_dbg(D_TRACE, "received ping reply from cache peer: %s:%d (%d ms)", cs_inet_ntoa(SIN_GET_ADDR(client->udp_sa)), ntohs(SIN_GET_PORT(client->udp_sa)), now - ping);
			client->cwcacheexping = now - ping;
		}
		break;

	case TYPE_RESENDREQ: // sent as a result of delay alert in a remote cache
		if(rs >= 16)
		{
			uint32_t port = b2i(4, buf + 1);
			ECM_REQUEST *er = get_ecmtask();
			if(!er) { return -1; }

			parse_request(er, buf + 5);

			ECM_REQUEST *result = check_cache(er, client);

			if(result)
			{

				er->rc = E_FOUND;
				er->rcEx = 0;
				memcpy(er->cw, result->cw, 16);
				er->grp |= result->grp;
				NULLFREE(result);

				int32_t status = csp_cache_push_out(client, er);
				cs_log_dbg(D_TRACE, "received resend request from cache peer: %s:%d (replied: %d)", cs_inet_ntoa(SIN_GET_ADDR(client->udp_sa)), port, status);
			}
			else
			{
				cs_log_dbg(D_TRACE, "received resend request from cache peer: %s:%d (not found)", cs_inet_ntoa(SIN_GET_ADDR(client->udp_sa)), port);
			}
			NULLFREE(er);
		}
		break;

	default:
		cs_log_dbg(D_TRACE, "unknown csp cache message received: %d", type);
	}

	return rs;
}

void module_csp(struct s_module *ph)
{
	ph->ptab.nports = 1;
	ph->ptab.ports[0].s_port = cfg.csp_port;

	ph->desc = "csp";
	ph->type = MOD_CONN_UDP;
	ph->large_ecm_support = 1;
	ph->listenertype = LIS_CSPUDP;
	IP_ASSIGN(ph->s_ip, cfg.csp_srvip);
	ph->s_handler = csp_server;
	ph->recv = csp_recv;
	ph->c_cache_push = csp_cache_push_out;
	ph->num = R_CSP;
}

#endif