udhcp: decided to not send "short" dhcp packets,

but lets add comments how to do it if needed.

diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index c389022..22c18de 100644 (file)
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -122,7 +122,7 @@ uint16_t udhcp_checksum(void *addr, int count)
 }
 
 
-/* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
+/* Construct a ip/udp header for a packet, send packet */
 int udhcp_send_raw_packet(struct dhcpMessage *payload,
                uint32_t source_ip, int source_port,
                uint32_t dest_ip, int dest_port, const uint8_t *dest_arp, int ifindex)
@@ -175,6 +175,10 @@ int udhcp_send_raw_packet(struct dhcpMessage *payload,
        packet.ip.ttl = IPDEFTTL;
        packet.ip.check = udhcp_checksum(&packet.ip, sizeof(packet.ip));
 
+       /* Currently we send full-sized DHCP packets (zero padded).
+        * If you need to change this: last byte of the packet is
+        * packet.data.options[end_option(packet.data.options)]
+        */
        result = sendto(fd, &packet, IP_UPD_DHCP_SIZE, 0, (struct sockaddr *) &dest, sizeof(dest));
        if (result <= 0) {
                bb_perror_msg("sendto");
@@ -222,6 +226,7 @@ int udhcp_send_kernel_packet(struct dhcpMessage *payload,
                return -1;
        }
 
+       /* Currently we send full-sized DHCP packets (see above) */
        result = write(fd, payload, DHCP_SIZE);
        close(fd);
        return result;