diff --git a/third-party/libnatpmp/LICENSE b/third-party/libnatpmp/LICENSE
new file mode 100644
index 000000000..470d093b4
--- /dev/null
+++ b/third-party/libnatpmp/LICENSE
@@ -0,0 +1,14 @@
+libnatpmp
+Copyright (c) 2007, Thomas BERNARD <miniupnp@free.fr>
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/third-party/libnatpmp/Makefile.am b/third-party/libnatpmp/Makefile.am
new file mode 100644
index 000000000..5e268e1b5
--- /dev/null
+++ b/third-party/libnatpmp/Makefile.am
@@ -0,0 +1,13 @@
+noinst_LIBRARIES = libnatpmp.a
+
+libnatpmp_a_SOURCES = \
+    getgateway.c \
+    natpmp.c
+
+noinst_HEADERS = \
+    getgateway.h \
+    natpmp.h
+
+extra_DIST = \
+    README \
+    LICENSE
diff --git a/third-party/libnatpmp/README b/third-party/libnatpmp/README
new file mode 100644
index 000000000..fda0a5484
--- /dev/null
+++ b/third-party/libnatpmp/README
@@ -0,0 +1,4 @@
+libnatpmp is written by Thomas Bernard.
+Its homepage is http://miniupnp.tuxfamily.org/libnatpmp.html
+This code is from the libnatpmp-20071202 snapshot
+
diff --git a/third-party/libnatpmp/getgateway.c b/third-party/libnatpmp/getgateway.c
new file mode 100644
index 000000000..6d17b3570
--- /dev/null
+++ b/third-party/libnatpmp/getgateway.c
@@ -0,0 +1,111 @@
+/* $Id: getgateway.c,v 1.4 2007/11/22 18:01:37 nanard Exp $ */
+/* libnatpmp
+ * Copyright (c) 2007, Thomas BERNARD <miniupnp@free.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+#include <stdio.h>
+#include <ctype.h>
+#include <netinet/in.h>
+#include <sys/param.h>
+#ifdef BSD
+#include <stdlib.h>
+#include <sys/sysctl.h>
+#include <sys/socket.h>
+#include <net/route.h>
+#endif
+#include "getgateway.h"
+
+#ifdef __linux__
+int getdefaultgateway(in_addr_t * addr)
+{
+	long d, g;
+	char buf[256];
+	int line = 0;
+	FILE * f;
+	char * p;
+	f = fopen("/proc/net/route", "r");
+	if(!f)
+		return -1;
+	while(fgets(buf, sizeof(buf), f)) {
+		if(line > 0) {
+			p = buf;
+			while(*p && !isspace(*p))
+				p++;
+			while(*p && isspace(*p))
+				p++;
+			if(sscanf(p, "%lx%lx", &d, &g)==2) {
+				if(d == 0) { /* default */
+					*addr = g;
+					fclose(f);
+					return 0;
+				}
+			}
+		}
+		line++;
+	}
+	/* not found ! */
+	if(f)
+		fclose(f);
+	return -1;
+}
+#endif
+
+#ifdef BSD 
+
+#define ROUNDUP(a) \
+	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
+
+int getdefaultgateway(in_addr_t * addr)
+{
+	int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET,
+	             NET_RT_DUMP, 0, 0/*tableid*/};
+	size_t l;
+	char * buf, * p;
+	struct rt_msghdr * rt;
+	struct sockaddr * sa;
+	struct sockaddr * sa_tab[RTAX_MAX];
+	int i;
+	int r = -1;
+	if(sysctl(mib, sizeof(mib)/sizeof(int), 0, &l, 0, 0) < 0) {
+		return -1;
+	}
+	if(l>0) {
+		buf = malloc(l);
+		if(sysctl(mib, sizeof(mib)/sizeof(int), buf, &l, 0, 0) < 0) {
+			return -1;
+		}
+		for(p=buf; p<buf+l; p+=rt->rtm_msglen) {
+			rt = (struct rt_msghdr *)p;
+			sa = (struct sockaddr *)(rt + 1);
+			for(i=0; i<RTAX_MAX; i++) {
+				if(rt->rtm_addrs & (1 << i)) {
+					sa_tab[i] = sa;
+					sa = (struct sockaddr *)((char *)sa + ROUNDUP(sa->sa_len));
+				} else {
+					sa_tab[i] = NULL;
+				}
+			}
+			if( ((rt->rtm_addrs & (RTA_DST|RTA_GATEWAY)) == (RTA_DST|RTA_GATEWAY))
+              && sa_tab[RTAX_DST]->sa_family == AF_INET
+              && sa_tab[RTAX_GATEWAY]->sa_family == AF_INET) {
+				if(((struct sockaddr_in *)sa_tab[RTAX_DST])->sin_addr.s_addr == 0) {
+					*addr = ((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr;
+					r = 0;
+				}
+			}
+		}
+		free(buf);
+	}
+	return r;
+}
+#endif
diff --git a/third-party/libnatpmp/getgateway.h b/third-party/libnatpmp/getgateway.h
new file mode 100644
index 000000000..e00483e3b
--- /dev/null
+++ b/third-party/libnatpmp/getgateway.h
@@ -0,0 +1,25 @@
+/* $Id: getgateway.h,v 1.2 2007/11/22 18:01:37 nanard Exp $ */
+/* libnatpmp
+ * Copyright (c) 2007, Thomas BERNARD <miniupnp@free.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+#ifndef __GETGATEWAY_H__
+#define __GETGATEWAY_H__
+
+/* getdefaultgateway() :
+ * return value :
+ *    0 : success
+ *   -1 : failure    */
+int getdefaultgateway(in_addr_t * addr);
+
+#endif
diff --git a/third-party/libnatpmp/natpmp.c b/third-party/libnatpmp/natpmp.c
new file mode 100644
index 000000000..5e5b528cd
--- /dev/null
+++ b/third-party/libnatpmp/natpmp.c
@@ -0,0 +1,249 @@
+/* $Id: natpmp.c,v 1.4 2007/12/02 00:12:47 nanard Exp $ */
+/* libnatpmp
+ * Copyright (c) 2007, Thomas BERNARD <miniupnp@free.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include "natpmp.h"
+#include "getgateway.h"
+
+int initnatpmp(natpmp_t * p)
+{
+	int flags; 
+	struct sockaddr_in addr;
+	if(!p)
+		return NATPMP_ERR_INVALIDARGS;
+	memset(p, 0, sizeof(natpmp_t));
+	p->s = socket(PF_INET, SOCK_DGRAM, 0);
+	if(p->s < 0)
+		return NATPMP_ERR_SOCKETERROR;
+	if((flags = fcntl(p->s, F_GETFL, 0)) < 0)
+		return NATPMP_ERR_FCNTLERROR;
+	if(fcntl(p->s, F_SETFL, flags | O_NONBLOCK) < 0)
+		return NATPMP_ERR_FCNTLERROR;
+
+	if(getdefaultgateway(&(p->gateway)) < 0)
+		return NATPMP_ERR_CANNOTGETGATEWAY;
+	
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(NATPMP_PORT);
+	addr.sin_addr.s_addr = p->gateway;
+	if(connect(p->s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
+		return NATPMP_ERR_CONNECTERR;
+	return 0;
+}
+
+int closenatpmp(natpmp_t * p)
+{
+	if(!p)
+		return NATPMP_ERR_INVALIDARGS;
+	if(close(p->s) < 0)
+		return NATPMP_ERR_CLOSEERR;
+	return 0;
+}
+
+int sendpendingrequest(natpmp_t * p)
+{
+	int r;
+/*	struct sockaddr_in addr;*/
+	if(!p)
+		return NATPMP_ERR_INVALIDARGS;
+/*	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(NATPMP_PORT);
+	addr.sin_addr.s_addr = p->gateway;
+	r = (int)sendto(p->s, p->pending_request, p->pending_request_len, 0,
+	                   (struct sockaddr *)&addr, sizeof(addr));*/
+	r = (int)send(p->s, p->pending_request, p->pending_request_len, 0);
+	return (r<0) ? NATPMP_ERR_SENDERR : r;
+}
+
+int sendnatpmprequest(natpmp_t * p)
+{
+	int n;
+	if(!p)
+		return NATPMP_ERR_INVALIDARGS;
+	/* TODO : check if no request is allready pending */
+	p->has_pending_request = 1;
+	p->try_number = 1;
+	n = sendpendingrequest(p);
+	gettimeofday(&p->retry_time, NULL);	// check errors !
+	p->retry_time.tv_usec += 250000;	/* add 250ms */
+	if(p->retry_time.tv_usec >= 1000000) {
+		p->retry_time.tv_usec -= 1000000;
+		p->retry_time.tv_sec++;
+	}
+	return n;
+}
+
+int getnatpmprequesttimeout(natpmp_t * p, struct timeval * timeout)
+{
+	struct timeval now;
+	if(!p || !timeout)
+		return NATPMP_ERR_INVALIDARGS;
+	if(!p->has_pending_request)
+		return NATPMP_ERR_NOPENDINGREQ;
+	if(gettimeofday(&now, NULL) < 0)
+		return NATPMP_ERR_GETTIMEOFDAYERR;
+	timeout->tv_sec = p->retry_time.tv_sec - now.tv_sec;
+	timeout->tv_usec = p->retry_time.tv_usec - now.tv_usec;
+	if(timeout->tv_usec < 0) {
+		timeout->tv_usec += 1000000;
+		timeout->tv_sec--;
+	}
+	return 0;
+}
+
+int sendpublicaddressrequest(natpmp_t * p)
+{
+	if(!p)
+		return NATPMP_ERR_INVALIDARGS;
+	//static const unsigned char request[] = { 0, 0 };
+	p->pending_request[0] = 0;
+	p->pending_request[1] = 0;
+	p->pending_request_len = 2;
+	// TODO: return 0 instead of sizeof(request) ??
+	return sendnatpmprequest(p);
+}
+
+int sendnewportmappingrequest(natpmp_t * p, int protocol,
+                              uint16_t privateport, uint16_t publicport,
+							  uint32_t lifetime)
+{
+	if(!p || (protocol!=NATPMP_PROTOCOL_TCP && protocol!=NATPMP_PROTOCOL_UDP))
+		return NATPMP_ERR_INVALIDARGS;
+	p->pending_request[0] = 0;
+	p->pending_request[1] = protocol;
+	p->pending_request[2] = 0;
+	p->pending_request[3] = 0;
+	*((uint16_t *)(p->pending_request + 4)) = htons(privateport);
+	*((uint16_t *)(p->pending_request + 6)) = htons(publicport);
+	*((uint32_t *)(p->pending_request + 8)) = htonl(lifetime);
+	p->pending_request_len = 12;
+	return sendnatpmprequest(p);
+}
+
+int readnatpmpresponse(natpmp_t * p, natpmpresp_t * response)
+{
+	unsigned char buf[16];
+	struct sockaddr_in addr;
+	socklen_t addrlen = sizeof(addr);
+	int n;
+	if(!p)
+		return NATPMP_ERR_INVALIDARGS;
+	n = recvfrom(p->s, buf, sizeof(buf), 0,
+	             (struct sockaddr *)&addr, &addrlen);
+	if(n<0)
+		switch(errno) {
+		case EAGAIN:
+			n = NATPMP_TRYAGAIN;
+			break;
+		case ECONNREFUSED:
+			n = NATPMP_ERR_NOGATEWAYSUPPORT;
+			break;
+		default:
+			n = NATPMP_ERR_RECVFROM;
+		}
+	/* check that addr is correct (= gateway) */
+	else if(addr.sin_addr.s_addr != p->gateway)
+		n = NATPMP_ERR_WRONGPACKETSOURCE;
+	else {
+		response->resultcode = ntohs(*((uint16_t *)(buf + 2)));
+		response->epoch = ntohl(*((uint32_t *)(buf + 4)));
+		if(buf[0] != 0)
+			n = NATPMP_ERR_UNSUPPORTEDVERSION;
+		else if(buf[1] < 128 || buf[1] > 130)
+			n = NATPMP_ERR_UNSUPPORTEDOPCODE;
+		else if(response->resultcode != 0) {
+			switch(response->resultcode) {
+			case 1:
+				n = NATPMP_ERR_UNSUPPORTEDVERSION;
+				break;
+			case 2:
+				n = NATPMP_ERR_NOTAUTHORIZED;
+				break;
+			case 3:
+				n = NATPMP_ERR_NETWORKFAILURE;
+				break;
+			case 4:
+				n = NATPMP_ERR_OUTOFRESOURCES;
+				break;
+			case 5:
+				n = NATPMP_ERR_UNSUPPORTEDOPCODE;
+				break;
+			default:
+				n = NATPMP_ERR_UNDEFINEDERROR;
+			}
+		} else {
+			response->type = buf[1] & 0x7f;
+			if(buf[1] == 128)
+				//response->publicaddress.addr = *((uint32_t *)(buf + 8));
+				response->publicaddress.addr.s_addr = *((uint32_t *)(buf + 8));
+			else {
+				response->newportmapping.privateport = ntohs(*((uint16_t *)(buf + 8)));
+				response->newportmapping.mappedpublicport = ntohs(*((uint16_t *)(buf + 10)));
+				response->newportmapping.lifetime = ntohl(*((uint32_t *)(buf + 12)));
+			}
+			n = 0;
+		}
+	}
+	return n;
+}
+
+int readnatpmpresponseorretry(natpmp_t * p, natpmpresp_t * response)
+{
+	int n;
+	if(!p || !response)
+		return NATPMP_ERR_INVALIDARGS;
+	if(!p->has_pending_request)
+		return NATPMP_ERR_NOPENDINGREQ;
+	n = readnatpmpresponse(p, response);
+	if(n<0) {
+		if(n==NATPMP_TRYAGAIN) {
+			struct timeval now;
+			gettimeofday(&now, NULL);	// check errors !
+			if(timercmp(&now, &p->retry_time, >=)) {
+				int delay, r;
+				if(p->try_number >= 9) {
+					return NATPMP_ERR_NOGATEWAYSUPPORT;
+				}
+				/*printf("retry! %d\n", p->try_number);*/
+				delay = 250 * (1<<p->try_number);	// ms
+				/*for(i=0; i<p->try_number; i++)
+					delay += delay;*/
+				p->retry_time.tv_sec += (delay / 1000);
+				p->retry_time.tv_usec += (delay % 1000) * 1000;
+				if(p->retry_time.tv_usec >= 1000000) {
+					p->retry_time.tv_usec -= 1000000;
+					p->retry_time.tv_sec++;
+				}
+				p->try_number++;
+				r = sendpendingrequest(p);
+				if(r<0)
+					return r;
+			}
+		}
+	} else {
+		p->has_pending_request = 0;
+	}
+	return n;
+}
+
diff --git a/third-party/libnatpmp/natpmp.h b/third-party/libnatpmp/natpmp.h
new file mode 100644
index 000000000..c20a86659
--- /dev/null
+++ b/third-party/libnatpmp/natpmp.h
@@ -0,0 +1,169 @@
+/* $Id: natpmp.h,v 1.3 2007/12/02 00:12:47 nanard Exp $ */
+/* libnatpmp
+ * Copyright (c) 2007, Thomas BERNARD <miniupnp@free.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+#ifndef __NATPMP_H__
+#define __NATPMP_H__
+
+/* NAT-PMP Port as defined by the NAT-PMP draft */
+#define NATPMP_PORT (5351)
+
+#include <time.h>
+#include <netinet/in.h>
+
+typedef struct {
+	int s;	/* socket */
+	in_addr_t gateway;	/* default gateway (IPv4) */
+	int has_pending_request;
+	unsigned char pending_request[12];
+	int pending_request_len;
+	int try_number;
+	struct timeval retry_time;
+} natpmp_t;
+
+typedef struct {
+	uint16_t type;	/* NATPMP_RESPTYPE_* */
+	uint16_t resultcode;	/* NAT-PMP response code */
+	uint32_t epoch;	/* Seconds since start of epoch */
+	union {
+		struct {
+			//in_addr_t addr;
+			struct in_addr addr;
+		} publicaddress;
+		struct {
+			uint16_t privateport;
+			uint16_t mappedpublicport;
+			uint32_t lifetime;
+		} newportmapping;
+	};
+} natpmpresp_t;
+
+/* possible values for type field of natpmpresp_t */
+#define NATPMP_RESPTYPE_PUBLICADDRESS (0)
+#define NATPMP_RESPTYPE_TCPPORTMAPPING (1)
+#define NATPMP_RESPTYPE_UDPPORTMAPPING (2)
+
+/* Values to pass to sendnewportmappingrequest() */
+#define NATPMP_PROTOCOL_TCP (1)
+#define NATPMP_PROTOCOL_UDP (2)
+
+/* NATPMP_ERR_INVALIDARGS : invalid arguments passed to the function */
+#define NATPMP_ERR_INVALIDARGS (-1)
+/* NATPMP_ERR_SOCKETERROR : socket() failed. check errno for details */
+#define NATPMP_ERR_SOCKETERROR (-2)
+/* NATPMP_ERR_CANNOTGETGATEWAY : can't get default gateway IP */
+#define NATPMP_ERR_CANNOTGETGATEWAY (-3)
+/* NATPMP_ERR_CLOSEERR : close() failed. check errno for details */
+#define NATPMP_ERR_CLOSEERR (-4)
+/* NATPMP_ERR_RECVFROM : recvfrom() failed. check errno for details */
+#define NATPMP_ERR_RECVFROM (-5)
+/* NATPMP_ERR_NOPENDINGREQ : readnatpmpresponseorretry() called while
+ * no NAT-PMP request was pending */
+#define NATPMP_ERR_NOPENDINGREQ (-6)
+/* NATPMP_ERR_NOGATEWAYSUPPORT : the gateway does not support NAT-PMP */
+#define NATPMP_ERR_NOGATEWAYSUPPORT (-7)
+/* NATPMP_ERR_CONNECTERR : connect() failed. check errno for details */
+#define NATPMP_ERR_CONNECTERR (-8)
+/* NATPMP_ERR_WRONGPACKETSOURCE : packet not received from the network gateway */
+#define NATPMP_ERR_WRONGPACKETSOURCE (-9)
+/* NATPMP_ERR_SENDERR : send() failed. check errno for details */
+#define NATPMP_ERR_SENDERR (-10)
+/* NATPMP_ERR_FCNTLERROR : fcntl() failed. check errno for details */
+#define NATPMP_ERR_FCNTLERROR (-11)
+/* NATPMP_ERR_GETTIMEOFDAYERR : gettimeofday() failed. check errno for details */
+#define NATPMP_ERR_GETTIMEOFDAYERR (-12)
+
+/* */
+#define NATPMP_ERR_UNSUPPORTEDVERSION (-14)
+#define NATPMP_ERR_UNSUPPORTEDOPCODE (-15)
+
+/* Errors from the server : */
+#define NATPMP_ERR_UNDEFINEDERROR (-49)
+#define NATPMP_ERR_NOTAUTHORIZED (-51)
+#define NATPMP_ERR_NETWORKFAILURE (-52)
+#define NATPMP_ERR_OUTOFRESOURCES (-53)
+
+/* NATPMP_TRYAGAIN : no data available for the moment. try again later */
+#define NATPMP_TRYAGAIN (-100)
+
+/* initnatpmp()
+ * initialize a natpmp_t object
+ * Return values :
+ * 0 = OK
+ * NATPMP_ERR_INVALIDARGS
+ * NATPMP_ERR_SOCKETERROR
+ * NATPMP_ERR_FCNTLERROR
+ * NATPMP_ERR_CANNOTGETGATEWAY
+ * NATPMP_ERR_CONNECTERR */
+int initnatpmp(natpmp_t * p);
+
+/* closenatpmp()
+ * close resources associated with a natpmp_t object
+ * Return values :
+ * 0 = OK
+ * NATPMP_ERR_INVALIDARGS
+ * NATPMP_ERR_CLOSEERR */
+int closenatpmp(natpmp_t * p);
+
+/* sendpublicaddressrequest()
+ * send a public address NAT-PMP request to the network gateway
+ * Return values :
+ * 2 = OK (size of the request)
+ * NATPMP_ERR_INVALIDARGS
+ * NATPMP_ERR_SENDERR */
+int sendpublicaddressrequest(natpmp_t * p);
+
+/* sendnewportmappingrequest()
+ * send a new port mapping NAT-PMP request to the network gateway
+ * Arguments :
+ * protocol is either NATPMP_PROTOCOL_TCP or NATPMP_PROTOCOL_UDP,
+ * lifetime is in seconds.
+ * Return values :
+ * 12 = OK (size of the request)
+ * NATPMP_ERR_INVALIDARGS
+ * NATPMP_ERR_SENDERR */
+int sendnewportmappingrequest(natpmp_t * p, int protocol,
+                              uint16_t privateport, uint16_t publicport,
+							  uint32_t lifetime);
+
+/* getnatpmprequesttimeout()
+ * fills the timeval structure with the timeout duration of the
+ * currently pending NAT-PMP request.
+ * Return values :
+ * 0 = OK
+ * NATPMP_ERR_INVALIDARGS
+ * NATPMP_ERR_GETTIMEOFDAYERR
+ * NATPMP_ERR_NOPENDINGREQ */
+int getnatpmprequesttimeout(natpmp_t * p, struct timeval * timeout);
+
+/* readnatpmpresponseorretry()
+ * fills the natpmpresp_t structure if possible
+ * Return values :
+ * 0 = OK
+ * NATPMP_TRYAGAIN
+ * NATPMP_ERR_INVALIDARGS
+ * NATPMP_ERR_NOPENDINGREQ
+ * NATPMP_ERR_NOGATEWAYSUPPORT
+ * NATPMP_ERR_RECVFROM
+ * NATPMP_ERR_WRONGPACKETSOURCE
+ * NATPMP_ERR_UNSUPPORTEDVERSION
+ * NATPMP_ERR_UNSUPPORTEDOPCODE
+ * NATPMP_ERR_NOTAUTHORIZED
+ * NATPMP_ERR_NETWORKFAILURE
+ * NATPMP_ERR_OUTOFRESOURCES
+ * NATPMP_ERR_UNSUPPORTEDOPCODE
+ * NATPMP_ERR_UNDEFINEDERROR */
+int readnatpmpresponseorretry(natpmp_t * p, natpmpresp_t * response);
+
+#endif