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authorDenis Vlasenko2006-11-20 01:13:09 +0000
committerDenis Vlasenko2006-11-20 01:13:09 +0000
commitc9cdeaa3fef3f93eb259957d36c760ec8902e0c1 (patch)
tree18eb5bb7b7fa9a3ceb9c607eefb571ddb0c5e95b /networking
parent4a5cf16a368bf513a2c2e3b27821a37d3df3cf89 (diff)
downloadbusybox-c9cdeaa3fef3f93eb259957d36c760ec8902e0c1.zip
busybox-c9cdeaa3fef3f93eb259957d36c760ec8902e0c1.tar.gz
add compile-time check for correct DHCP packet size
Diffstat (limited to 'networking')
-rw-r--r--networking/udhcp/packet.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c
index e79542d..8591044 100644
--- a/networking/udhcp/packet.c
+++ b/networking/udhcp/packet.c
@@ -109,6 +109,7 @@ uint16_t udhcp_checksum(void *addr, int count)
/* Construct a ip/udp header for a packet, and specify the source and dest hardware address */
+void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void);
int udhcp_raw_packet(struct dhcpMessage *payload,
uint32_t source_ip, int source_port,
uint32_t dest_ip, int dest_port, uint8_t *dest_arp, int ifindex)
@@ -154,6 +155,9 @@ int udhcp_raw_packet(struct dhcpMessage *payload,
packet.ip.ttl = IPDEFTTL;
packet.ip.check = udhcp_checksum(&(packet.ip), sizeof(packet.ip));
+ if (sizeof(struct udp_dhcp_packet) != 576)
+ BUG_sizeof_struct_udp_dhcp_packet_must_be_576();
+
result = sendto(fd, &packet, sizeof(struct udp_dhcp_packet), 0,
(struct sockaddr *) &dest, sizeof(dest));
if (result <= 0) {