Added fr_dhcp_add_arp_entry

This will later be used for the updated DHCP code

diff --git a/src/include/dhcp.h b/src/include/dhcp.h
index 2d66ca0..85bf24f 100644 (file)
--- a/src/include/dhcp.h
+++ b/src/include/dhcp.h
@@ -38,6 +38,8 @@ extern "C" {
 RADIUS_PACKET *fr_dhcp_recv(int sockfd);
 int fr_dhcp_send(RADIUS_PACKET *packet);
 
+int fr_dhcp_add_arp_entry(int fd, const char *interface, VALUE_PAIR *hwvp, VALUE_PAIR *clvp);
+
 int fr_dhcp_encode(RADIUS_PACKET *packet, RADIUS_PACKET *original);
 int fr_dhcp_decode(RADIUS_PACKET *packet);
 

diff --git a/src/lib/dhcp.c b/src/lib/dhcp.c
index c67a554..79fe17d 100644 (file)
--- a/src/lib/dhcp.c
+++ b/src/lib/dhcp.c
@@ -1532,4 +1532,41 @@ int fr_dhcp_encode(RADIUS_PACKET *packet, RADIUS_PACKET *original)
 
        return 0;
 }
+
+int fr_dhcp_add_arp_entry(int fd, const char *interface,
+                         VALUE_PAIR *macaddr, VALUE_PAIR *ip)
+{
+#ifdef SIOCSARP
+       struct sockaddr_in *sin
+       struct arpreq req;
+
+       if (macaddr->length > sizeof (req.arp_ha.sa_data)) {
+               fr_strerror_printf("ERROR: DHCP only supports up to %d octets for "
+                                  "Client Hardware Address (got %d octets)\n",
+                                  sizeof(req.arp_ha.sa_data),
+                                  macaddr->length);
+               return -1;
+       }
+
+       memset(&req, 0, sizeof(req));
+       sin = (struct sockaddr_in *) &req.arp_pa;
+       sin->sin_family = AF_INET;
+       sin->sin_addr.s_addr = ip->vp_ipaddr;
+       strlcpy(req.arp_dev, interface, sizeof(req.arp_dev));
+       memcpy(&req.arp_ha.sa_data, macaddr->vp_octets, macaddr->length);
+
+       req.arp_flags = ATF_COM;
+       if (ioctl(fd, SIOCSARP, &req) < 0) {
+               fr_strerror_printf("DHCP: Failed to add entry in ARP cache: %s (%d)",
+                                  strerror(errno), errno);
+               return -1;
+       }
+
+       return 0;
+#else
+       fr_strerror_printf("Adding ARP entry is unsupported on this system");
+       return -1;
+#endif
+}
+
 #endif /* WITH_DHCP */