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udhcp: optional support for non-standard DHCP ports (+300 bytes when selected)

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This commit is contained in:
Denis Vlasenko
2008-02-04 13:12:16 +00:00
parent e8ef7ec7de
commit d55fe3e595
10 changed files with 79 additions and 14 deletions
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14
networking/udhcp/clientsocket.c
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@ -33,8 +33,8 @@
#include <linux/filter.h>
#include "common.h"
#define SERVER_AND_CLIENT_PORTS ((SERVER_PORT << 16) + CLIENT_PORT)
#include "dhcpd.h"
#include "dhcpc.h"
int raw_socket(int ifindex)
{
@ -62,6 +62,7 @@ int raw_socket(int ifindex)
*
* TODO: make conditional?
*/
#define SERVER_AND_CLIENT_PORTS ((67 << 16) + 68)
static const struct sock_filter filter_instr[] = {
/* check for udp */
BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9),
@ -89,10 +90,13 @@ int raw_socket(int ifindex)
fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
DEBUG("got raw socket fd %d", fd);
/* Ignoring error (kernel may lack support for this) */
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog,
if (SERVER_PORT == 67 && CLIENT_PORT == 68) {
/* Use only if standard ports are in use */
/* Ignoring error (kernel may lack support for this) */
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog,
sizeof(filter_prog)) >= 0)
DEBUG("attached filter to raw socket fd %d", fd);
DEBUG("attached filter to raw socket fd %d", fd);
}
sock.sll_family = AF_PACKET;
sock.sll_protocol = htons(ETH_P_IP);