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authorDenis Vlasenko2007-12-21 16:32:30 +0000
committerDenis Vlasenko2007-12-21 16:32:30 +0000
commit619879246d57c9c54fa8e8eef138dde0876b0ef0 (patch)
tree6b7149912f7d5177820a5c282bab5b75784e6c68 /networking/udhcp/packet.c
parentfff145dba309df2a6ba2986ad2b690f7e0858cad (diff)
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udhcp: decided to not send "short" dhcp packets,
but lets add comments how to do it if needed.
Diffstat (limited to 'networking/udhcp/packet.c')
-rw-r--r--networking/udhcp/packet.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index c389022..22c18de 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;