#include "dhcp-protocol.h"
#include "socket-util.h"
-int dhcp_network_bind_raw_socket(int index, union sockaddr_union *link,
+int dhcp_network_bind_raw_socket(int ifindex, union sockaddr_union *link,
uint32_t xid, const uint8_t *mac_addr,
size_t mac_addr_len, uint16_t arp_type,
uint16_t port);
-int dhcp_network_bind_udp_socket(be32_t address, uint16_t port);
+int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port);
int dhcp_network_send_raw_socket(int s, const union sockaddr_union *link,
const void *packet, size_t len);
int dhcp_network_send_udp_socket(int s, be32_t address, uint16_t port,
#include <errno.h>
#include <net/ethernet.h>
+#include <net/if.h>
#include <net/if_arp.h>
#include <stdio.h>
#include <string.h>
bcast_addr, ð_mac, arp_type, dhcp_hlen, port);
}
-int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
+int dhcp_network_bind_udp_socket(int ifindex, be32_t address, uint16_t port) {
union sockaddr_union src = {
.in.sin_family = AF_INET,
.in.sin_port = htobe16(port),
.in.sin_addr.s_addr = address,
};
_cleanup_close_ int s = -1;
+ char ifname[IF_NAMESIZE] = "";
int r, on = 1, tos = IPTOS_CLASS_CS6;
s = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (r < 0)
return -errno;
+ if (ifindex > 0) {
+ if (if_indextoname(ifindex, ifname) == 0)
+ return -errno;
+
+ r = setsockopt(s, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname));
+ if (r < 0)
+ return -errno;
+ }
+
if (address == INADDR_ANY) {
r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
if (r < 0)
r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
if (r < 0)
return -errno;
+
} else {
r = setsockopt(s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on));
if (r < 0)