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

but lets add comments how to do it if needed.

1 files changed, 6 insertions, 1 deletions

diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index c3890229f..22c18deaf 100644
--- 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;