diff options
Diffstat (limited to 'networking/udhcp/clientsocket.c')
| -rw-r--r-- | networking/udhcp/clientsocket.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/networking/udhcp/clientsocket.c b/networking/udhcp/clientsocket.c index 954db53..b5534f8 100644 --- a/networking/udhcp/clientsocket.c +++ b/networking/udhcp/clientsocket.c @@ -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); |