/*
 * Copyright (C) 2006-2007 VozTelecom Sistemas S.L
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <string.h>	 /*memset*/
#include <errno.h>	 /*errno*/
#include <unistd.h>	 /*close(),pipe,fork,pid_t*/
#include <sys/wait.h>/*wait*/
#include <signal.h>	 /*SIGINT,etc*/

#include "../../core/sr_module.h"
#include "../../core/ip_addr.h"		   /*ip_addr,hostent2ip_addr*/
#include "../../core/tags.h"		   /*init_tags*/
#include "../../core/socket_info.h"	   /*get_first_socket()*/
#include "../../core/resolve.h"		   /*resolvehost*/
#include "../../core/mem/mem.h"		   /*pkg_malloc*/
#include "../../core/mem/shm_mem.h"	   /*shm_malloc*/
#include "../../core/dprint.h"		   /*LM_**/
#include "../../core/error.h"		   /*ser_error*/
#include "../../modules/tm/tm_load.h"  /*load_tm_api*/
#include "../../modules/tm/h_table.h"  /*cell*/
#include "../../modules/tm/t_lookup.h" /*T_UNDEFINED*/
#include "../../core/cfg/cfg_struct.h"

#include "encode_msg.h" /*encode_msg*/

#include "seas.h"
#include "seas_action.h"
#include "event_dispatcher.h"
#include "statistics.h" /*pstart_stats_server*/
#include "ha.h"
#include "cluster.h"

MODULE_VERSION


/* Exported Functions */
static int w_as_relay_t(struct sip_msg *msg, char *as_name, char *foo);
static int w_as_relay_sl(struct sip_msg *msg, char *as_name, char *foo);

/* Local functions */
static int seas_init(void);
static int seas_child_init(int rank);
static void seas_exit();
static int fixup_as_relay(void **param, int param_no);

/*utility functions*/
static void seas_init_tags();
static inline int is_e2e_ack(struct cell *t, struct sip_msg *msg);

char seas_tags[TOTAG_VALUE_LEN + 1];
char *seas_tag_suffix;
char whoami[MAX_WHOAMI_LEN];
int is_dispatcher = 0;
extern int sig_flag;

static char *seas_listen_socket = 0;
static char *seas_stats_socket = 0;

struct ip_addr *seas_listen_ip = 0;
unsigned short seas_listen_port = 0;

struct as_entry *as_table = 0;

struct as_entry *as_list = 0;

int write_pipe = 0;
int read_pipe = 0;

struct seas_functions seas_f;

static cmd_export_t cmds[] = {{"as_relay_t", (cmd_function)w_as_relay_t, 1,
									  fixup_as_relay, 0, REQUEST_ROUTE},
		{"as_relay_sl", (cmd_function)w_as_relay_sl, 1, fixup_as_relay, 0,
				REQUEST_ROUTE},
		{0, 0, 0, 0, 0, 0}};

static param_export_t params[] = {
		{"listen_sockets", PARAM_STRING, &seas_listen_socket},
		{"stats_socket", PARAM_STRING, &seas_stats_socket},
		{"jain_ping", PARAM_STRING, &jain_ping_config},
		{"servlet_ping", PARAM_STRING, &servlet_ping_config},
		{"clusters", PARAM_STRING, &cluster_cfg}, {0, 0, 0}};

struct module_exports exports = {
		"seas", DEFAULT_DLFLAGS, cmds, /* exported commands */
		params,						   /* exported parameters */
		0,							   /* exported RPC methods */
		0,				 /* exported module-items (pseudo variables) */
		0,				 /* response function */
		seas_init,		 /* module initialization function */
		seas_child_init, /* per-child init function */
		seas_exit		 /* module exit function */
};

static int fixup_as_relay(void **param, int param_no)
{
	int len;
	char *parameter;
	struct as_entry **entry, *tmp;

	parameter = (char *)(*param);

	if(param_no != 1)
		return 0;
	len = strlen(parameter);

	for(entry = &as_list; *entry; entry = &((*entry)->next)) {
		if(len == (*entry)->name.len
				&& !memcmp((*entry)->name.s, parameter, len)) {
			pkg_free(*param);
			*param = *entry;
			return 1;
		}
	}
	if(!(*entry)) {
		if(!(*entry = (struct as_entry *)shm_malloc(sizeof(struct as_entry)))) {
			LM_ERR("no more shm_mem\n");
			goto error;
		}
		memset(*entry, 0, sizeof(struct as_entry));
		if(!((*entry)->name.s = shm_malloc(len))) {
			LM_ERR("no more share mem\n");
			goto error;
		}
		(*entry)->name.len = len;
		memcpy((*entry)->name.s, parameter, len);
		(*entry)->u.as.name = (*entry)->name;
		(*entry)->u.as.event_fd = (*entry)->u.as.action_fd = -1;
		(*entry)->type = AS_TYPE;
		pkg_free(*param);
		*param = *entry;
	}
	for(tmp = as_list; tmp; tmp = tmp->next)
		LM_DBG("%.*s\n", tmp->name.len, tmp->name.s);
	return 1;
error:
	return -1;
}

/**
 * Sets up signal handlers
 */
void seas_sighandler(int signo)
{
	struct as_entry *as;
	if(is_dispatcher)
		sig_flag = signo;
	switch(signo) {
		case SIGPIPE:
			if(is_dispatcher)
				return;
			LM_INFO("%s exiting\n", whoami);
			if(my_as->u.as.ac_buffer.s) {
				pkg_free(my_as->u.as.ac_buffer.s);
				my_as->u.as.ac_buffer.s = 0;
			}
			if(my_as->u.as.action_fd != -1) {
				close(my_as->u.as.action_fd);
				my_as->u.as.action_fd = -1;
			}
			exit(0);
			break;
		case SIGCHLD:
			LM_INFO("Child stopped or terminated\n");
			break;
		case SIGUSR1:
		case SIGUSR2:
			LM_DBG("Memory status (pkg):\n");
#ifdef PKG_MALLOC
			pkg_status();
#endif
			break;
		case SIGINT:
		case SIGTERM:
			LM_INFO("INFO: signal %d received\n", signo);
#ifdef PKG_MALLOC
			pkg_status();
#endif
			if(is_dispatcher) {
				for(as = as_list; as; as = as->next) {
					if(as->type == AS_TYPE && as->connected)
						kill(as->u.as.action_pid, signo);
				}
				while(wait(0) > 0)
					;
				exit(0);
			} else {
				LM_INFO("%s exiting\n", whoami);
				if(my_as && my_as->u.as.ac_buffer.s)
					pkg_free(my_as->u.as.ac_buffer.s);
				if(my_as && my_as->u.as.action_fd != -1)
					close(my_as->u.as.action_fd);
				exit(0);
			}
			break;
	}
}

/**
 * wrapper for the AS transaction-stateful relay script function.
 *
 */
static int w_as_relay_t(struct sip_msg *msg, char *entry, char *foo)
{
	as_msg_p my_as_ev;
	int new_tran, ret = 0, len;
	char *buffer, processor_id;
	struct cell *mycel;
	struct as_entry *as;
	char *msg100 = "Your call is important to us";
	char *msg500 = "Server Internal Error!";

	buffer = (char *)0;
	my_as_ev = (as_msg_p)0;

	/**
	 * returns <0 on error
	 * 1 if (new transaction was created) or if (ACK for locally replied 200 with totag) or if (ACK for code>=300)
	 * 0 if it was a retransmission
	 */
	new_tran = seas_f.tmb.t_newtran(msg);
	if(new_tran < 0) {
		ret = (ser_error == E_BAD_VIA && reply_to_via) ? 0 : new_tran;
		goto done;
	}
	/*retransmission: script processing should be stopped*/
	if(new_tran == 0 && !(msg->REQ_METHOD == METHOD_ACK)) {
		ret = 0;
		goto done;
	}
	/*new transaction created, let's pass it to an APP SERVER*/
	if(msg->REQ_METHOD == METHOD_INVITE) {
		LM_DBG("new INVITE\n");
		if(!seas_f.tmb.t_reply(msg, 100, msg100)) {
			LM_DBG("t_reply (100)\n");
			goto error;
		}
	}
	as = (struct as_entry *)entry;
	if(!as->connected) {
		LM_ERR("app server %.*s not connected\n", as->name.len, as->name.s);
		goto error;
	}
	if(as->type == AS_TYPE) {
		if((processor_id = get_processor_id(&msg->rcv, &(as->u.as))) < 0) {
			LM_ERR("no processor found for packet dst %s:%d\n",
					ip_addr2a(&msg->rcv.dst_ip), msg->rcv.dst_port);
			goto error;
		}
	} else if(as->type == CLUSTER_TYPE) {
		LM_ERR("clustering not fully implemented\n");
		return 0;
	} else {
		LM_ERR("unknown type of as (neither cluster nor as)\n");
		return -1;
	}
	LM_DBG("as found ! (%.*s) processor id = %d\n", as->name.len, as->name.s,
			processor_id);
	if(new_tran == 1 && msg->REQ_METHOD == METHOD_ACK) {
		LM_DBG("message handled in transaction callbacks. skipping\n");
		ret = 0;
		goto done;
		/* core should forward statelessly (says t_newtran)
		 * LM_DBG("forwarding statelessly !!!\n");
		 * if(!(buffer=create_as_event_sl(msg,processor_id,&len,0))){
		 * LM_ERR("create_as_event_sl() unable to create event code\n");
		 * goto error;
		 * }
		 */
	} else if(!(buffer = create_as_event_t(
						seas_f.tmb.t_gett(), msg, processor_id, &len, 0))) {
		LM_ERR("unable to create event code\n");
		goto error;
	}
	if(!(my_as_ev = shm_malloc(sizeof(as_msg_t)))) {
		LM_ERR("Out of shared mem!\n");
		goto error;
	}
	my_as_ev->msg = buffer;
	my_as_ev->as = as;
	my_as_ev->type = T_REQ_IN;
	my_as_ev->len = len;
	my_as_ev->transaction = seas_f.tmb.t_gett(); /*does not refcount*/
	if(use_stats && new_tran > 0)
		as_relay_stat(seas_f.tmb.t_gett());
again:
	ret = write(write_pipe, &my_as_ev, sizeof(as_msg_p));
	if(ret == -1) {
		if(errno == EINTR)
			goto again;
		else if(errno == EPIPE) {
			LM_ERR("SEAS Event Dispatcher has closed the pipe. Invalidating it "
				   "!\n");
			goto error;
			/** TODO handle this correctly !!!*/
		}
	}
	/* seas_f.tmb.t_setkr(REQ_FWDED); */
	ret = 0;
done:
	return ret;
error:
	mycel = seas_f.tmb.t_gett();
	if(mycel && mycel != T_UNDEFINED) {
		if(!seas_f.tmb.t_reply(msg, 500, msg500)) {
			LM_ERR("t_reply (500)\n");
		}
	}
	if(my_as_ev)
		shm_free(my_as_ev);
	if(buffer)
		shm_free(buffer);
	return ret;
}


/**
 * wrapper for the AS stateless relay script function.
 *
 */
static int w_as_relay_sl(struct sip_msg *msg, char *as_name, char *foo)
{
	as_msg_p my_as_ev = 0;
	int ret = 0, len;
	char *buffer = 0, processor_id;
	struct as_entry *as;

	as = (struct as_entry *)as_name;

	if(as->type == AS_TYPE) {
		if((processor_id = get_processor_id(&msg->rcv, &(as->u.as))) < 0) {
			LM_ERR("no processor found for packet with dst port:%d\n",
					msg->rcv.dst_port);
			goto error;
		}
	} else if(as->type == CLUSTER_TYPE) {
		LM_ERR("clustering not fully implemented\n");
		goto error;
	} else {
		LM_ERR("unknown type of as\n");
		goto error;
	}

	LM_DBG("as found ! (%.*s) processor id = %d\n", as->name.len, as->name.s,
			processor_id);
	if(!(buffer = create_as_event_sl(msg, processor_id, &len, 0))) {
		LM_ERR("unable to create event code\n");
		goto error;
	}
	if(!(my_as_ev = shm_malloc(sizeof(as_msg_t))))
		goto error;
	my_as_ev->msg = buffer;
	my_as_ev->as = as;
	my_as_ev->type = SL_REQ_IN;
	my_as_ev->len = len;
	my_as_ev->transaction = seas_f.tmb.t_gett(); /*does not refcount*/
	if(use_stats)
		as_relay_stat(seas_f.tmb.t_gett());
again:
	ret = write(write_pipe, &my_as_ev, sizeof(as_msg_p));
	if(ret == -1) {
		if(errno == EINTR)
			goto again;
		else if(errno == EPIPE) {
			LM_ERR("SEAS Event Dispatcher has closed the pipe. Invalidating it "
				   "!\n");
			return -2;
			/** TODO handle this correctly !!!*/
		}
	}
	//this shouldn't be here, because it will remove the transaction from memory, but
	//if transaction isn't unref'ed iw will be released anyway at t_unref if kr (killreason)==0
	// a wait timer will be put to run with WT_TIME_OUT (5 seconds, within which the AS should respond)
	// this is a bug !!! I think this is why we lose calls at high load !!
	//t_release(msg, 0, 0);
	/* seas_f.tmb.t_setkr(REQ_FWDED); */

	ret = 0;
	return ret;
error:
	if(my_as_ev)
		shm_free(my_as_ev);
	if(buffer)
		shm_free(buffer);
	return ret;
}

/**
 * creates an as_event in shared memory and returns its address or NULL if error.
 * event_length(4) UNSIGNED INT includes the length 4 bytes itself
 * type(1),
 * flags(4),
 * transport(1).
 * src_ip_len(1),
 * src_ip(4 or 16),
 * dst_ip_len(1),
 * dst_ip(4 or 16),
 * src_port(2),
 * dst_port(2),
 * hash index(4),
 * label(4),
 * [cancelled hash_index,label]
 *
 */
char *create_as_event_t(struct cell *t, struct sip_msg *msg, char processor_id,
		int *evt_len, int flags)
{
	unsigned int i, hash_index, label;
	unsigned short int port;
	unsigned int k, len;
	char *buffer = NULL;
	struct cell *originalT;

	originalT = 0;

	if(!(buffer = shm_malloc(ENCODED_MSG_SIZE))) {
		LM_ERR("Out Of Memory !!\n");
		return 0;
	}
	*evt_len = 0;
	if(t) {
		hash_index = t->hash_index;
		label = t->label;
	} else {
		/**seas_f.tmb.t_get_trans_ident(msg,&hash_index,&label); this is bad, because it ref-counts !!!*/
		LM_ERR("no transaction provided...\n");
		goto error;
	}

	k = 4;
	/*type*/
	buffer[k++] = (unsigned char)T_REQ_IN;
	/*processor_id*/
	buffer[k++] = (unsigned char)processor_id;
	/*flags*/
	if(is_e2e_ack(t, msg)) {
		flags |= E2E_ACK;
	} else if(msg->REQ_METHOD == METHOD_CANCEL) {
		LM_DBG("new CANCEL\n");
		originalT = seas_f.tmb.t_lookup_original(msg);
		if(!originalT || originalT == T_UNDEFINED) {
			/** we don't even pass the unknown CANCEL to JAIN*/
			LM_WARN("CANCEL does not match any existing transaction!!\n");
			goto error;
		} else {
			flags |= CANCEL_FOUND;
			//seas_f.tmb.unref_cell(originalT);
		}
		LM_DBG("Cancelling transaction !!\n");
	}
	flags = htonl(flags);
	memcpy(buffer + k, &flags, 4);
	k += 4;
	/*protocol should be UDP,TCP,TLS or whatever*/
	buffer[k++] = (unsigned char)msg->rcv.proto;
	/*src ip len + src ip*/
	len = msg->rcv.src_ip.len;
	buffer[k++] = (unsigned char)len;
	memcpy(buffer + k, &(msg->rcv.src_ip.u), len);
	k += len;
	/*dst ip len + dst ip*/
	len = msg->rcv.dst_ip.len;
	buffer[k++] = (unsigned char)len;
	memcpy(buffer + k, &(msg->rcv.dst_ip.u), len);
	k += len;
	/*src port */
	port = htons(msg->rcv.src_port);
	memcpy(buffer + k, &port, 2);
	k += 2;
	/*dst port */
	port = htons(msg->rcv.dst_port);
	memcpy(buffer + k, &port, 2);
	k += 2;
	/*hash_index*/
	i = htonl(hash_index);
	memcpy(buffer + k, &i, 4);
	k += 4;
	/*label (is the collision slot in the hash-table)*/
	i = htonl(label);
	memcpy(buffer + k, &i, 4);
	k += 4;
	if(msg->REQ_METHOD == METHOD_CANCEL && originalT) {
		LM_DBG("Cancelled transaction: Hash_Index=%d, Label=%d\n",
				originalT->hash_index, originalT->label);
		/*hash_index*/
		i = htonl(originalT->hash_index);
		memcpy(buffer + k, &i, 4);
		k += 4;
		/*label (is the collision slot in the hash-table)*/
		i = htonl(originalT->label);
		memcpy(buffer + k, &i, 4);
		k += 4;
	}

	/*length of event (hdr+payload-4), copied at the beginning*/
	if(encode_msg(msg, buffer + k, ENCODED_MSG_SIZE - k) < 0) {
		LM_ERR("Unable to encode msg\n");
		goto error;
	}
	i = GET_PAY_SIZE(buffer + k);
	k += i;
	*evt_len = k;
	k = htonl(k);
	memcpy(buffer, &k, 4);
	return buffer;
error:
	if(buffer)
		shm_free(buffer);
	return 0;
}


/**
 * creates an as_event in shared memory and returns its address or NULL if error.
 * event_length(4) UNSIGNED INT includes the length 4 bytes itself
 * type(1),
 * processor_id(4),
 * flags(4),
 * transport(1).
 * src_ip_len(1),
 * src_ip(4 or 16),
 * dst_ip_len(1),
 * dst_ip(4 or 16),
 * src_port(2),
 * dst_port(2),
 *
 */
char *create_as_event_sl(
		struct sip_msg *msg, char processor_id, int *evt_len, int flags)
{
	unsigned int i;
	unsigned short int port;
	unsigned int k, len;
	char *buffer = NULL;

	if(!(buffer = shm_malloc(ENCODED_MSG_SIZE))) {
		LM_ERR("create_as_event_t Out Of Memory !!\n");
		return 0;
	}
	*evt_len = 0;

	/*leave 4 bytes for event length*/
	k = 4;
	/*type*/
	buffer[k++] = (unsigned char)SL_REQ_IN;
	/*processor_id*/
	buffer[k++] = (unsigned char)processor_id;
	/*flags*/
	flags = htonl(flags);
	memcpy(buffer + k, &flags, 4);
	k += 4;
	/*protocol should be UDP,TCP,TLS or whatever*/
	buffer[k++] = (unsigned char)msg->rcv.proto;
	/*src ip len + src ip*/
	len = msg->rcv.src_ip.len;
	buffer[k++] = (unsigned char)len;
	memcpy(buffer + k, &(msg->rcv.src_ip.u), len);
	k += len;
	/*dst ip len + dst ip*/
	len = msg->rcv.dst_ip.len;
	buffer[k++] = (unsigned char)len;
	memcpy(buffer + k, &(msg->rcv.dst_ip.u), len);
	k += len;
	/*src port */
	port = htons(msg->rcv.src_port);
	memcpy(buffer + k, &port, 2);
	k += 2;
	/*dst port */
	port = htons(msg->rcv.dst_port);
	memcpy(buffer + k, &port, 2);
	k += 2;
	/*length of event (hdr+payload-4), copied at the beginning*/
	if(encode_msg(msg, buffer + k, ENCODED_MSG_SIZE - k) < 0) {
		LM_ERR("Unable to encode msg\n");
		goto error;
	}
	i = GET_PAY_SIZE(buffer + k);
	k += i;
	*evt_len = k;
	k = htonl(k);
	memcpy(buffer, &k, 4);
	return buffer;
error:
	if(buffer)
		shm_free(buffer);
	return 0;
}


static inline int is_e2e_ack(struct cell *t, struct sip_msg *msg)
{
	if(msg->REQ_METHOD != METHOD_ACK)
		return 0;
	if(t->uas.status < 300)
		return 1;
	return 0;
}

/** Initializes seas module. It first parses the listen_sockets parameter
 * which has the form "ip_address[:port]", creates the pipe to
 * communicate with the dispatcher.
 */
static int seas_init(void)
{
	char *p, *port;
	struct hostent *he;
	struct socket_info *si;
	int c_pipe[2], mierr, i;
	/** Populate seas_functions*/
	if(load_tm_api(&seas_f.tmb) != 0) {
		LM_ERR("can't load TM API\n");
		return -1;
	}
	if(!(seas_f.t_check_orig_trans = find_export("t_check_trans", 0, 0))) {
		LM_ERR("Seas requires transaction module (t_check_trans not found)\n");
		return -1;
	}
	/** Populate seas_functions*/
	c_pipe[0] = c_pipe[1] = -1;
	p = seas_listen_socket;
	port = (char *)0;
	seas_listen_port = 5080;
	/*if the seas_listen_socket configuration string is empty, use default values*/
	if(p == NULL || *p == 0) {
		si = get_first_socket();
		seas_listen_ip = &si->address;
	} else { /*if config string is not empty, then try to find host first, and maybe port..*/
		while(*p) {
			if(*p == ':') {
				*p = 0;
				port = p + 1;
				break;
			}
			p++;
		}
		if(!(he = resolvehost(seas_listen_socket)))
			goto error;
		if(!(seas_listen_ip = pkg_malloc(sizeof(struct ip_addr))))
			goto error;
		hostent2ip_addr(seas_listen_ip, he, 0);
		if(port != (char *)0
				&& (seas_listen_port = str2s(port, strlen(port), &mierr))
						   == 0) {
			LM_ERR("invalid port %s \n", port);
			goto error;
		}
	}
	memset(unc_as_t, 0,
			2 * MAX_UNC_AS_NR
					* sizeof(struct
							unc_as)); //useless because unc_as_t is in bss?
	if(pipe(c_pipe) == -1) {
		LM_ERR("cannot create pipe!\n");
		goto error;
	}
	read_pipe = c_pipe[0];
	write_pipe = c_pipe[1];
	seas_init_tags();
	if(0 > start_stats_server(seas_stats_socket))
		goto error;
	if(0 > prepare_ha())
		goto error;
	if(0 > parse_cluster_cfg())
		goto error;
	register_procs(1);
	/* add child to update local config framework structures */
	cfg_register_child(1);

	return 0;
error:
	for(i = 0; i < 2; i++)
		if(c_pipe[i] != -1)
			close(c_pipe[i]);
	if(seas_listen_ip != 0)
		pkg_free(seas_listen_ip);
	if(use_stats)
		stop_stats_server();
	return -1;
}


/**Initializes SEAS to-tags
*/
static void seas_init_tags(void)
{
	init_tags(seas_tags, &seas_tag_suffix, "VozTele-Seas/tags", '-');
	LM_DBG("seas_init_tags, seas_tags=%s\n", seas_tags);
}

/**
 * This function initializes each one of the processes spawn by the server.
 * the rank is 1 only when the main process is being initialized, so in that
 * case the function spawns the SEAS process to handle as_events triggered
 * from the other SER processes (executing the script).
 * the new process created, then goes into dispatcher_main_loop(), where
 * it reads() the pipe waiting for events produced by other SER processes.
 */
static int seas_child_init(int rank)
{
	int pid;

	/* only the child 1 will execute this */
	if(rank != PROC_MAIN) {
		/* only dispatcher needs to read from the pipe, so close reading fd*/
		/*close(read_pipe);*/
		return 0;
	}
	if((pid = fork_process(PROC_NOCHLDINIT, "SEAS", 0)) < 0) {
		LM_ERR("forking failed\n");
		return -1;
	}
	if(!pid) {
		/*dispatcher child. we leave writing end open so that new childs spawned
		 * by event dispatcher can also write to pipe.. */

		/* initialize the config framework */
		if(cfg_child_init())
			return -1;

		/* close(write_pipe); */
		return dispatcher_main_loop();
	}
	return 0;
}

/* this should close the sockets open to any of the application servers, and
 * send them an EOF event or something that signals that SER is being shutdown,
 * so they could do their cleanup, etc.
 */
static void seas_exit(void)
{
	if(seas_listen_ip != NULL
			&& seas_listen_ip != &(get_first_socket()->address))
		pkg_free(seas_listen_ip);
	return;
}

/**
 * search within a given AS, if any of the registered processors is bound
 * to the receive_info structure passed. If there is one, it returns its
 * identifier (number between 0 and 128), otherwise it returns -1;
 */
char get_processor_id(struct receive_info *rcv, as_p as)
{
	int i;
	for(i = 0; i < MAX_BINDS; i++) {
		if(as->bound_processor[i]!=0 &&
				(rcv->dst_ip.len == as->binds[i]->address.len) &&
				(rcv->dst_ip.af==as->binds[i]->address.af) &&
				(!memcmp(rcv->dst_ip.u.addr,as->binds[i]->address.u.addr,rcv->dst_ip.len))/* &&
																							(rcv->dst_port==as->binds[i].dst_port) &&
																							(rcv->proto==as->binds[i].proto)*/)
			return as->bound_processor[i];
	}
	return -1;
}
