/*************************************************************************
* (C) 2022 CloudSigma AG - Sofia/Bulgaria
*  by Michael Pounov <misho@elwix.org>
**************************************************************************/
#include "fwsync.h"


static intptr_t fwsync_wchan;


static void
fwsync_edge_proc(void *arg)
{
	int e, rcvflg;
	struct uio uio;
	struct mbuf *m = NULL;

	DTRACE();

	memset(&uio, 0, sizeof uio);
	uio.uio_resid = 1000000000;
	uio.uio_td = curthread;

	fws_ctx.config |= CTX_EDGE_ONLINE;
	while ((fws_cfg.cfg.on & CFG_SYNC_EDGE) && (fws_ctx.config & CTX_EDGE_READY)) {
		if (m)
			m_freem(m);
		m = NULL;
		rcvflg = MSG_DONTWAIT;
		e = soreceive(fws_ctx.sockz[CFG_SYNC_ADDR_EDGE], NULL, &uio, &m, NULL, &rcvflg);
		if (e) {
			if (e != EAGAIN)
				printf("error in edge handler #%d\n", e);
			tsleep(&fwsync_wchan, 0, "edge_handler", hz);
			continue;
		}

		printf("%u...-> %s\n", m->m_len, m->m_data);
	}
	fws_ctx.config &= ~CTX_EDGE_ONLINE;

	kproc_exit(0);
}

int
fwsync_cfg(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd)
{
	ipfw_obj_header *oh;
	struct ipfw_sync_cfg *ucfg;
	size_t sz;
	int e;

	DTRACE();

	sz = sizeof(*oh) + sizeof(*ucfg);
	/* Check minimum header size */
	if (sd->valsize < sz)
		return (EINVAL);

	oh = (ipfw_obj_header*) sd->kbuf;

	/* Basic length checks for TLVs */
	if (oh->ntlv.head.length != sizeof(oh->ntlv))
		return (EINVAL);

	ucfg = (struct ipfw_sync_cfg*) (oh + 1);

	/* Check if name is properly terminated */
	if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
		return (EINVAL);

	if (ucfg->mode == CFG_SYNC_EDGE && !fws_cfg.cfg.edge && !(fws_ctx.config & CTX_CFG_EDGE) && 
			!strcmp(ucfg->name, "edge") && ucfg->addrs == 1) {
		fws_cfg.cfg.edge = 1;
		memcpy(&fws_cfg.cfg_addr[CFG_SYNC_ADDR_EDGE], &ucfg->addr[CFG_SYNC_ADDR_EDGE], 
				sizeof fws_cfg.cfg_addr[CFG_SYNC_ADDR_EDGE]);
		fws_ctx.config |= CTX_CFG_EDGE;

		e = socreate((fws_cfg.cfg_addr[CFG_SYNC_ADDR_EDGE].addr.sa_family == AF_INET) ? AF_INET : AF_INET6, 
				&fws_ctx.sockz[CFG_SYNC_ADDR_EDGE], SOCK_DGRAM, IPPROTO_UDP, curthread->td_ucred, curthread);
		if (e) {
			printf("fwsync edge socreate failed #%d\n", e);
			return e;
		}

		e = sobind(fws_ctx.sockz[CFG_SYNC_ADDR_EDGE], &fws_cfg.cfg_addr[CFG_SYNC_ADDR_EDGE].addr, curthread);
		if (e) {
			if (e != EADDRINUSE)
				printf("fwsync edge sobind failed #%d\n", e);
			else
				printf("fwsync edge address in use!\n");
			return e;
		} else
			fws_ctx.config |= CTX_EDGE_READY;
	} else if (ucfg->mode == CFG_SYNC_COLLECTOR && !(fws_ctx.config & CTX_CFG_COLLECTOR_1) && 
			!strcmp(ucfg->name, "collector") && ucfg->addrs > 0 && ucfg->addrs < 3) {
		fws_cfg.cfg.collector = 1;
		fws_cfg.cfg.addrs = ucfg->addrs;
		memcpy(&fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_1], &ucfg->addr[CFG_SYNC_ADDR_COLLECTOR_1], 
				sizeof fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_1]);

		fws_ctx.config |= CTX_CFG_COLLECTOR_1;

		e = socreate((fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_1].addr.sa_family == AF_INET) ? AF_INET : AF_INET6, 
				&fws_ctx.sockz[CFG_SYNC_ADDR_COLLECTOR_1], SOCK_DGRAM, IPPROTO_UDP, curthread->td_ucred, curthread);
		if (e) {
			printf("fwsync collector %d socreate failed #%d\n", e, CFG_SYNC_ADDR_COLLECTOR_1);
			return e;
		} else
			fws_ctx.config |= CTX_COLLECTOR_1_READY;

		if (fws_cfg.cfg.addrs > 1) {
			memcpy(&fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_2], &ucfg->addr[CFG_SYNC_ADDR_COLLECTOR_2], 
					sizeof fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_2]);

			fws_ctx.config |= CTX_CFG_COLLECTOR_2;

			e = socreate((fws_cfg.cfg_addr[CFG_SYNC_ADDR_COLLECTOR_2].addr.sa_family == AF_INET) ? AF_INET : AF_INET6, 
					&fws_ctx.sockz[CFG_SYNC_ADDR_COLLECTOR_2], SOCK_DGRAM, IPPROTO_UDP, curthread->td_ucred, curthread);
			if (e) {
				printf("fwsync collector %d socreate failed #%d\n", e, CFG_SYNC_ADDR_COLLECTOR_2);
				return e;
			} else
				fws_ctx.config |= CTX_COLLECTOR_2_READY;
		}
	} else
		return (EINVAL);

	return 0;
}

int
fwsync_destroy(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd)
{
	int *n;
	ipfw_obj_header *oh;
	size_t sz;

	DTRACE();

	sz = sizeof(*oh) + sizeof(int);
	/* Check minimum header size */
	if (sd->valsize < sz)
		return (EINVAL);

	oh = (ipfw_obj_header*) sd->kbuf;

	/* Basic length checks for TLVs */
	if (oh->ntlv.head.length != sizeof(oh->ntlv))
		return (EINVAL);

	n = (int*) (oh + 1);
	if (*n & CFG_SYNC_EDGE) {
		fws_cfg.cfg.on &= ~CFG_SYNC_EDGE;
		fws_cfg.cfg.edge = 0;
		fws_cfg.cfg.addrs = 0;
		memset(fws_cfg.cfg_addr, 0, sizeof fws_cfg.cfg_addr[0]);

		if (fws_ctx.config & CTX_EDGE_READY) {
			soshutdown(fws_ctx.sockz[CFG_SYNC_ADDR_EDGE], SHUT_RD);
			tsleep(&fwsync_wchan, 0, "fwsedge_kill", 2 * hz);
			soclose(fws_ctx.sockz[CFG_SYNC_ADDR_EDGE]);
		}
	}
	if (*n & CFG_SYNC_COLLECTOR) {
		if (fws_ctx.config & (CTX_COLLECTOR_1_ONLINE | CTX_COLLECTOR_2_ONLINE)) {
			ipfw_unregister_state_hook();
			ipfw_unregister_alias_hook();
		}

		fws_cfg.cfg.on &= ~CFG_SYNC_COLLECTOR;
		fws_cfg.cfg.collector = 0;
		fws_cfg.cfg.addrs = 0;
		memset(fws_cfg.cfg_addr + 1, 0, sizeof fws_cfg.cfg_addr[0] * 2);

		if (fws_ctx.config & CTX_COLLECTOR_2_READY)
			soclose(fws_ctx.sockz[CFG_SYNC_ADDR_COLLECTOR_2]);
		if (fws_ctx.config & CTX_COLLECTOR_1_READY)
			soclose(fws_ctx.sockz[CFG_SYNC_ADDR_COLLECTOR_1]);
	}

	fws_ctx.config ^= fws_ctx.config;

	return 0;
}

int
fwsync_get_cfg(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd)
{
	ipfw_obj_header *oh;
	struct ipfw_sync_cfg *ucfg;
	size_t sz;

	DTRACE();

	sz = sizeof(*oh) + sizeof(*ucfg);
	/* Check minimum header size */
	if (sd->valsize < sz)
		return (EINVAL);

	oh = (struct _ipfw_obj_header*) ipfw_get_sopt_header(sd, sz);

	/* Basic length checks for TLVs */
	if (oh->ntlv.head.length != sizeof(oh->ntlv))
		return (EINVAL);

	ucfg = (struct ipfw_sync_cfg*) (oh + 1);

	/* Check if name is properly terminated */
	if (strnlen(ucfg->name, sizeof(ucfg->name)) == sizeof(ucfg->name))
		return (EINVAL);

	snprintf(ucfg->name, sizeof ucfg->name, "%d", fws_cfg.cfg.on);
	ucfg->mode = 0;
	if (fws_cfg.cfg.edge)
		ucfg->mode |= CFG_SYNC_EDGE;
	if (fws_cfg.cfg.collector)
		ucfg->mode |= CFG_SYNC_COLLECTOR;
	ucfg->addrs = (fws_cfg.cfg.addrs != 1) ? fws_cfg.cfg.addrs : 1;
	memcpy(ucfg->addr, fws_cfg.cfg_addr, sizeof ucfg->addr);

	return 0;
}

int
fwsync_list(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd)
{
	DTRACE();

	return 0;
}

int
fwsync_start(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd)
{
	int *n, e;
	ipfw_obj_header *oh;
	size_t sz;

	DTRACE();

	sz = sizeof(*oh) + sizeof(int);
	/* Check minimum header size */
	if (sd->valsize < sz)
		return (EINVAL);

	oh = (ipfw_obj_header*) sd->kbuf;

	/* Basic length checks for TLVs */
	if (oh->ntlv.head.length != sizeof(oh->ntlv))
		return (EINVAL);

	n = (int*) (oh + 1);

	if ((*n & CFG_SYNC_EDGE) && (fws_ctx.config & CTX_EDGE_READY)) {
		fws_cfg.cfg.on |= CFG_SYNC_EDGE;

		e = kproc_create(fwsync_edge_proc, NULL, &fws_ctx.procz[CFG_SYNC_ADDR_EDGE], 
				0, 0, "fwsync_edge");
		if (e) {
			printf("fwsync fwsync_edge failed #%d\n", e);
			return e;
		}
	}

	if ((*n & CFG_SYNC_COLLECTOR) && (fws_ctx.config & CTX_COLLECTOR_1_READY)) {
		fws_cfg.cfg.on |= CFG_SYNC_COLLECTOR;

		if (!(fws_ctx.config & (CTX_COLLECTOR_1_ONLINE | CTX_COLLECTOR_2_ONLINE))) {
			ipfw_register_state_hook(fwsync_state_handler);
			ipfw_register_alias_hook(fwsync_alias_handler);
		}

		fws_ctx.config |= CTX_COLLECTOR_1_ONLINE;
	}

	if ((*n & CFG_SYNC_COLLECTOR) && (fws_ctx.config & CTX_COLLECTOR_2_READY)) {
		fws_cfg.cfg.on |= CFG_SYNC_COLLECTOR;

		if (!(fws_ctx.config & (CTX_COLLECTOR_1_ONLINE | CTX_COLLECTOR_2_ONLINE))) {
			ipfw_register_state_hook(fwsync_state_handler);
			ipfw_register_alias_hook(fwsync_alias_handler);
		}

		fws_ctx.config |= CTX_COLLECTOR_2_ONLINE;
	}

	return 0;
}

int
fwsync_stop(struct ip_fw_chain *ch, ip_fw3_opheader *op3, struct sockopt_data *sd)
{
	int *n;
	ipfw_obj_header *oh;
	size_t sz;

	DTRACE();

	sz = sizeof(*oh) + sizeof(int);
	/* Check minimum header size */
	if (sd->valsize < sz)
		return (EINVAL);

	oh = (ipfw_obj_header*) sd->kbuf;

	/* Basic length checks for TLVs */
	if (oh->ntlv.head.length != sizeof(oh->ntlv))
		return (EINVAL);

	n = (int*) (oh + 1);

	if ((*n & CFG_SYNC_EDGE) && (fws_ctx.config & CTX_CFG_EDGE))
		fws_cfg.cfg.on &= ~CFG_SYNC_EDGE;

	if ((*n & CFG_SYNC_COLLECTOR) && (fws_ctx.config & CTX_COLLECTOR_2_ONLINE))
		fws_ctx.config &= ~CTX_COLLECTOR_2_ONLINE;
	if ((*n & CFG_SYNC_COLLECTOR) && (fws_ctx.config & CTX_COLLECTOR_1_ONLINE))
		fws_ctx.config &= ~CTX_COLLECTOR_1_ONLINE;

	if ((*n & CFG_SYNC_COLLECTOR) && 
			!(fws_ctx.config & (CTX_COLLECTOR_1_ONLINE | CTX_COLLECTOR_2_ONLINE))) {
		fws_cfg.cfg.on &= ~CFG_SYNC_COLLECTOR;

		ipfw_unregister_state_hook();
		ipfw_unregister_alias_hook();
	}

	return 0;
}