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/* Copyright (c) 2010, Jacob Appelbaum, Steven J. Murdoch.
* Copyright (c) 2010-2013, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file tor-fw-helper-natpmp.c
* \brief The implementation of our NAT-PMP firewall helper.
**/
#include "orconfig.h"
#ifdef NAT_PMP
#ifdef _WIN32
#define STATICLIB
#endif
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#ifndef _WIN32
#include <arpa/inet.h>
#endif
// debugging stuff
#include <assert.h>
#include "compat.h"
#include "tor-fw-helper.h"
#include "tor-fw-helper-natpmp.h"
/** This hooks NAT-PMP into our multi-backend API. */
static tor_fw_backend_t tor_natpmp_backend = {
"natpmp",
sizeof(struct natpmp_state_t),
tor_natpmp_init,
tor_natpmp_cleanup,
tor_natpmp_fetch_public_ip,
tor_natpmp_add_tcp_mapping
};
/** Return the backend for NAT-PMP. */
const tor_fw_backend_t *
tor_fw_get_natpmp_backend(void)
{
return &tor_natpmp_backend;
}
/** Initialize the NAT-PMP backend and store the results in
* <b>backend_state</b>.*/
int
tor_natpmp_init(tor_fw_options_t *tor_fw_options, void *backend_state)
{
natpmp_state_t *state = (natpmp_state_t *) backend_state;
int r = 0;
memset(&(state->natpmp), 0, sizeof(natpmp_t));
memset(&(state->response), 0, sizeof(natpmpresp_t));
state->init = 0;
state->protocol = NATPMP_PROTOCOL_TCP;
state->lease = NATPMP_DEFAULT_LEASE;
if (tor_fw_options->verbose)
fprintf(stderr, "V: natpmp init...\n");
r = initnatpmp(&(state->natpmp), 0, 0);
if (r == 0) {
state->init = 1;
fprintf(stderr, "V: natpmp initialized...\n");
return r;
} else {
fprintf(stderr, "V: natpmp failed to initialize...\n");
return r;
}
}
/** Tear down the NAT-PMP connection stored in <b>backend_state</b>.*/
int
tor_natpmp_cleanup(tor_fw_options_t *tor_fw_options, void *backend_state)
{
natpmp_state_t *state = (natpmp_state_t *) backend_state;
int r = 0;
if (tor_fw_options->verbose)
fprintf(stderr, "V: natpmp cleanup...\n");
r = closenatpmp(&(state->natpmp));
if (tor_fw_options->verbose)
fprintf(stderr, "V: closing natpmp socket: %d\n", r);
return r;
}
/** Use select() to wait until we can read on fd. */
static int
wait_until_fd_readable(tor_socket_t fd, struct timeval *timeout)
{
int r;
fd_set fds;
#ifndef WIN32
if (fd >= FD_SETSIZE) {
fprintf(stderr, "E: NAT-PMP FD_SETSIZE error %d\n", fd);
return -1;
}
#endif
FD_ZERO(&fds);
FD_SET(fd, &fds);
r = select(fd+1, &fds, NULL, NULL, timeout);
if (r == -1) {
fprintf(stderr, "V: select failed in wait_until_fd_readable: %s\n",
tor_socket_strerror(tor_socket_errno(fd)));
return -1;
}
/* XXXX we should really check to see whether fd was readable, or we timed
out. */
return 0;
}
int
tor_natpmp_add_tcp_mapping(uint16_t internal_port, uint16_t external_port,
int is_verbose, void *backend_state)
{
int r = 0;
int x = 0;
int sav_errno;
natpmp_state_t *state = (natpmp_state_t *) backend_state;
struct timeval timeout;
if (is_verbose)
fprintf(stderr, "V: sending natpmp portmapping request...\n");
r = sendnewportmappingrequest(&(state->natpmp), state->protocol,
internal_port,
external_port,
state->lease);
if (is_verbose)
fprintf(stderr, "tor-fw-helper: NAT-PMP sendnewportmappingrequest "
"returned %d (%s)\n", r, r==12?"SUCCESS":"FAILED");
do {
getnatpmprequesttimeout(&(state->natpmp), &timeout);
x = wait_until_fd_readable(state->natpmp.s, &timeout);
if (x == -1)
return -1;
if (is_verbose)
fprintf(stderr, "V: attempting to readnatpmpreponseorretry...\n");
r = readnatpmpresponseorretry(&(state->natpmp), &(state->response));
sav_errno = tor_socket_errno(state->natpmp.s);
if (r<0 && r!=NATPMP_TRYAGAIN) {
fprintf(stderr, "E: readnatpmpresponseorretry failed %d\n", r);
fprintf(stderr, "E: errno=%d '%s'\n", sav_errno,
tor_socket_strerror(sav_errno));
}
} while (r == NATPMP_TRYAGAIN);
if (r != 0) {
/* XXX TODO: NATPMP_* should be formatted into useful error strings */
fprintf(stderr, "E: NAT-PMP It appears that something went wrong:"
" %d\n", r);
if (r == -51)
fprintf(stderr, "E: NAT-PMP It appears that the request was "
"unauthorized\n");
return r;
}
if (r == NATPMP_SUCCESS) {
fprintf(stderr, "tor-fw-helper: NAT-PMP mapped public port %hu to"
" localport %hu liftime %u\n",
(state->response).pnu.newportmapping.mappedpublicport,
(state->response).pnu.newportmapping.privateport,
(state->response).pnu.newportmapping.lifetime);
}
return (r == NATPMP_SUCCESS) ? 0 : -1;
}
/** Fetch our likely public IP from our upstream NAT-PMP enabled NAT device.
* Use the connection context stored in <b>backend_state</b>. */
int
tor_natpmp_fetch_public_ip(tor_fw_options_t *tor_fw_options,
void *backend_state)
{
int r = 0;
int x = 0;
int sav_errno;
natpmp_state_t *state = (natpmp_state_t *) backend_state;
struct timeval timeout;
r = sendpublicaddressrequest(&(state->natpmp));
fprintf(stderr, "tor-fw-helper: NAT-PMP sendpublicaddressrequest returned"
" %d (%s)\n", r, r==2?"SUCCESS":"FAILED");
do {
getnatpmprequesttimeout(&(state->natpmp), &timeout);
x = wait_until_fd_readable(state->natpmp.s, &timeout);
if (x == -1)
return -1;
if (tor_fw_options->verbose)
fprintf(stderr, "V: NAT-PMP attempting to read reponse...\n");
r = readnatpmpresponseorretry(&(state->natpmp), &(state->response));
sav_errno = tor_socket_errno(state->natpmp.s);
if (tor_fw_options->verbose)
fprintf(stderr, "V: NAT-PMP readnatpmpresponseorretry returned"
" %d\n", r);
if ( r < 0 && r != NATPMP_TRYAGAIN) {
fprintf(stderr, "E: NAT-PMP readnatpmpresponseorretry failed %d\n",
r);
fprintf(stderr, "E: NAT-PMP errno=%d '%s'\n", sav_errno,
tor_socket_strerror(sav_errno));
}
} while (r == NATPMP_TRYAGAIN );
if (r != 0) {
fprintf(stderr, "E: NAT-PMP It appears that something went wrong:"
" %d\n", r);
return r;
}
fprintf(stderr, "tor-fw-helper: ExternalIPAddress = %s\n",
inet_ntoa((state->response).pnu.publicaddress.addr));
tor_fw_options->public_ip_status = 1;
if (tor_fw_options->verbose) {
fprintf(stderr, "V: result = %u\n", r);
fprintf(stderr, "V: type = %u\n", (state->response).type);
fprintf(stderr, "V: resultcode = %u\n", (state->response).resultcode);
fprintf(stderr, "V: epoch = %u\n", (state->response).epoch);
}
return r;
}
#endif
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