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ws2_32: Permit broadcast packets on interface-bound sockets for systems with IP_BOUND_IF.

This commit is contained in:
Erich Hoover 2012-09-26 16:38:09 -06:00 committed by Alexandre Julliard
parent e03b8e1a1d
commit 9f2f7600c5
1 changed files with 64 additions and 0 deletions
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64
dlls/ws2_32/socket.c
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@ -2106,6 +2106,68 @@ static int WINAPI WS2_WSARecvMsg( SOCKET s, LPWSAMSG msg, LPDWORD lpNumberOfByte
lpOverlapped, lpCompletionRoutine, &msg->Control );
}
/***********************************************************************
* interface_bind (INTERNAL)
*
* Take bind() calls on any name corresponding to a local network adapter and restrict the given socket to
* operating only on the specified interface. This restriction consists of two components:
* 1) An outgoing packet restriction suggesting the egress interface for all packets.
* 2) An incoming packet restriction dropping packets not meant for the interface.
* If the function succeeds in placing these restrictions (returns TRUE) then the name for the bind() may
* safely be changed to INADDR_ANY, permitting the transmission and receipt of broadcast packets on the
* socket. This behavior is only relevant to UDP sockets and is needed for applications that expect to be able
* to receive broadcast packets on a socket that is bound to a specific network interface.
*/
static BOOL interface_bind( SOCKET s, int fd, struct sockaddr *addr )
{
struct sockaddr_in *in_sock = (struct sockaddr_in *) addr;
unsigned int sock_type = 0, optlen = sizeof(sock_type);
PIP_ADAPTER_INFO adapters = NULL, adapter;
BOOL ret = FALSE;
DWORD adap_size;
int enable = 1;
if (in_sock->sin_addr.s_addr == htonl(WS_INADDR_ANY))
return FALSE; /* Not binding to specific interface, uses default route */
if (getsockopt(fd, SOL_SOCKET, SO_TYPE, &sock_type, &optlen) == -1 || sock_type != SOCK_DGRAM)
return FALSE; /* Special interface binding is only necessary for UDP datagrams. */
if (GetAdaptersInfo(NULL, &adap_size) != ERROR_BUFFER_OVERFLOW)
goto cleanup;
adapters = HeapAlloc(GetProcessHeap(), 0, adap_size);
if (adapters == NULL || GetAdaptersInfo(adapters, &adap_size) != NO_ERROR)
goto cleanup;
/* Search the IPv4 adapter list for the appropriate binding interface */
for (adapter = adapters; adapter != NULL; adapter = adapter->Next)
{
in_addr_t adapter_addr = (in_addr_t) inet_addr(adapter->IpAddressList.IpAddress.String);
if (in_sock->sin_addr.s_addr == adapter_addr)
{
#if defined(IP_BOUND_IF)
/* IP_BOUND_IF sets both the incoming and outgoing restriction at once */
if (setsockopt(fd, IPPROTO_IP, IP_BOUND_IF, &adapter->Index, sizeof(adapter->Index)) != 0)
goto cleanup;
ret = TRUE;
#else
FIXME("Broadcast packets on interface-bound sockets are not currently supported on this platform, "
"receiving broadcast packets will not work on socket %04lx.\n", s);
#endif
break;
}
}
/* Will soon be switching to INADDR_ANY: permit address reuse */
if (ret && setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) == 0)
TRACE("Socket %04lx bound to interface index %d\n", s, adapter->Index);
else
ret = FALSE;
cleanup:
if(!ret)
ERR("Failed to bind to interface, receiving broadcast packets will not work on socket %04lx.\n", s);
HeapFree(GetProcessHeap(), 0, adapters);
return ret;
}
/***********************************************************************
* bind (WS2_32.2)
*/
@ -2157,6 +2219,8 @@ int WINAPI WS_bind(SOCKET s, const struct WS_sockaddr* name, int namelen)
"INADDR_ANY instead.\n");
in4->sin_addr.s_addr = htonl(WS_INADDR_ANY);
}
else if (interface_bind(s, fd, &uaddr.addr))
in4->sin_addr.s_addr = htonl(WS_INADDR_ANY);
}
if (bind(fd, &uaddr.addr, uaddrlen) < 0)
{