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transmission/third-party/libnatpmp/natpmp.c

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/* $Id: natpmp.c,v 1.9 2009/06/04 22:27:53 nanard Exp $ */
/* libnatpmp
* Copyright (c) 2007-2008, Thomas BERNARD <miniupnp@free.fr>
* http://miniupnp.free.fr/libnatpmp.html
*
* 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 <string.h>
#include <time.h>
#include <sys/time.h>
#ifdef WIN32
#include <errno.h>
#include <winsock2.h>
#include <ws2tcpip.h>
#include <io.h>
#define EWOULDBLOCK WSAEWOULDBLOCK
#define ECONNREFUSED WSAECONNREFUSED
#else
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#define closesocket close
#endif
#include "natpmp.h"
#include "getgateway.h"
LIBSPEC int initnatpmp(natpmp_t * p)
{
#ifdef WIN32
u_long ioctlArg = 1;
#else
int flags;
#endif
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;
#ifdef WIN32
if(ioctlsocket(p->s, FIONBIO, &ioctlArg) == SOCKET_ERROR)
return NATPMP_ERR_FCNTLERROR;
#else
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;
#endif
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;
}
LIBSPEC int closenatpmp(natpmp_t * p)
{
if(!p)
return NATPMP_ERR_INVALIDARGS;
if(closesocket(p->s) < 0)
return NATPMP_ERR_CLOSEERR;
return 0;
}
static 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;
}
static 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;
}
LIBSPEC 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;
}
LIBSPEC 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);
}
LIBSPEC 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);
}
LIBSPEC 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:*/
case EWOULDBLOCK:
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->pnu.publicaddress.addr.s_addr = *((uint32_t *)(buf + 8));
else {
response->pnu.newportmapping.privateport = ntohs(*((uint16_t *)(buf + 8)));
response->pnu.newportmapping.mappedpublicport = ntohs(*((uint16_t *)(buf + 10)));
response->pnu.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;
}
#ifdef ENABLE_STRNATPMPERR
LIBSPEC const char * strnatpmperr(int r)
{
const char * s;
switch(r) {
case NATPMP_ERR_INVALIDARGS:
s = "invalid arguments";
break;
case NATPMP_ERR_SOCKETERROR:
s = "socket() failed";
break;
case NATPMP_ERR_CANNOTGETGATEWAY:
s = "cannot get default gateway ip address";
break;
case NATPMP_ERR_CLOSEERR:
#ifdef WIN32
s = "closesocket() failed";
#else
s = "close() failed";
#endif
break;
case NATPMP_ERR_RECVFROM:
s = "recvfrom() failed";
break;
case NATPMP_ERR_NOPENDINGREQ:
s = "no pending request";
break;
case NATPMP_ERR_NOGATEWAYSUPPORT:
s = "the gateway does not support nat-pmp";
break;
case NATPMP_ERR_CONNECTERR:
s = "connect() failed";
break;
case NATPMP_ERR_WRONGPACKETSOURCE:
s = "packet not received from the default gateway";
break;
case NATPMP_ERR_SENDERR:
s = "send() failed";
break;
case NATPMP_ERR_FCNTLERROR:
s = "fcntl() failed";
break;
case NATPMP_ERR_GETTIMEOFDAYERR:
s = "gettimeofday() failed";
break;
case NATPMP_ERR_UNSUPPORTEDVERSION:
s = "unsupported nat-pmp version error from server";
break;
case NATPMP_ERR_UNSUPPORTEDOPCODE:
s = "unsupported nat-pmp opcode error from server";
break;
case NATPMP_ERR_UNDEFINEDERROR:
s = "undefined nat-pmp server error";
break;
case NATPMP_ERR_NOTAUTHORIZED:
s = "not authorized";
break;
case NATPMP_ERR_NETWORKFAILURE:
s = "network failure";
break;
case NATPMP_ERR_OUTOFRESOURCES:
s = "nat-pmp server out of resources";
break;
default:
s = "Unknown libnatpmp error";
}
return s;
}
#endif
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