/**
* Check whether host's address is usable: routable and not bogus.
*/
gboolean
host_address_is_usable(const host_addr_t addr)
{
if (!host_addr_is_routable(addr))
return FALSE;
if (bogons_check(addr))
return FALSE;
return TRUE;
}
/**
* Check the given IP against the entries in the bogus IP database.
*
* @returns TRUE if found, and FALSE if not.
*/
bool
bogons_check(const host_addr_t ha)
{
if G_UNLIKELY(NULL == bogons_db)
return FALSE;
/*
* If the bogons file is too ancient, there is a risk it may flag an
* IP as bogus whereas it is no longer reserved. IPv4 address shortage
* makes that likely.
* --RAM, 2010-11-07
*/
if (delta_time(tm_time(), bogons_mtime) > 15552000) /* ~6 months */
return !host_addr_is_routable(ha);
return 0 != iprange_get_addr(bogons_db, ha);
}
/**
* Handle reply to a discovery request.
*
* @param payload the received reply
* @param len length of reply
* @param rd the RPC request descriptor
*
* @return TRUE if we successfully processed the reply and notified the
* user code about the outcome of the request, FALSE if we need to resend
* the request.
*/
static bool
natpmp_handle_discovery_reply(
const void *payload, size_t len, struct natpmp_rpc *rd)
{
bstr_t *bs;
uint8 version;
uint8 code;
uint16 result;
uint32 ip;
host_addr_t wan_ip;
natpmp_t *np;
natpmp_rpc_check(rd);
/**
* A NAT gateway will reply with the following message:
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Vers = 0 | OP = 128 + 0 | Result Code |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Seconds Since Start of Epoch |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | External IP Address (a.b.c.d) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
* The first 32-bits are always present, the remaining of the packet
* may or may not be there depending on the result code.
*/
bs = bstr_open(payload, len,
GNET_PROPERTY(natpmp_debug) ? BSTR_F_ERROR : 0);
/*
* Make sure we got a valid reply.
*/
bstr_read_u8(bs, &version);
bstr_read_u8(bs, &code);
bstr_read_be16(bs, &result);
if (bstr_has_error(bs))
goto error;
if (GNET_PROPERTY(natpmp_debug) > 5) {
g_debug("NATPMP version=%u, code=%u, result_code=%u (%s)",
version, code, result, natpmp_strerror(result));
}
if (version != NATPMP_VERSION || code != NATPMP_REPLY_OFF + rd->op)
goto error;
if (NATPMP_E_OK != result)
goto failed;
bstr_read_be32(bs, &rd->sssoe);
bstr_read_be32(bs, &ip);
if (bstr_has_error(bs))
goto error;
wan_ip = host_addr_get_ipv4(ip);
if (GNET_PROPERTY(natpmp_debug) > 5) {
g_debug("NATPMP SSSOE=%u, WAN IP is %s",
rd->sssoe, host_addr_to_string(wan_ip));
}
if (!host_addr_is_routable(wan_ip))
goto failed;
/*
* Good, we got a valid reply from the gateway, with a routable WAN IP.
*/
if (rd->np != NULL) {
natpmp_check(rd->np);
np = rd->np;
natpmp_update(np, rd->sssoe);
np->wan_ip = wan_ip;
} else {
np = natpmp_alloc(rd->gateway, rd->sssoe, wan_ip);
}
(*rd->cb.discovery)(TRUE, np, rd->arg);
bstr_free(&bs);
return TRUE; /* OK */
failed:
if (GNET_PROPERTY(natpmp_debug))
g_warning("NATPMP did not find any suitable NAT-PMP gateway");
(*rd->cb.discovery)(FALSE, rd->np, rd->arg);
return TRUE; /* We're done for now */
error:
if (GNET_PROPERTY(natpmp_debug)) {
if (bstr_has_error(bs)) {
g_warning("NATPMP parsing error while processing discovery reply "
"(%zu byte%s): %s",
len, 1 == len ? "" : "s", bstr_error(bs));
} else {
g_warning("NATPMP inconsistent discovery reply (%zu byte%s)",
len, 1 == len ? "" : "s");
}
}
bstr_free(&bs);
return FALSE;
}
/**
* Initiate a browse host of the uploading host.
*/
void
uploads_gui_browse_host(host_addr_t addr, guint16 port)
{
if (host_addr_is_routable(addr) && port != 0)
search_gui_new_browse_host(NULL, addr, port, NULL, NULL, 0);
}
