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| author | Denis Vlasenko | 2006-11-20 01:13:09 +0000 |
|---|---|---|
| committer | Denis Vlasenko | 2006-11-20 01:13:09 +0000 |
| commit | c9cdeaa3fef3f93eb259957d36c760ec8902e0c1 (patch) | |
| tree | 18eb5bb7b7fa9a3ceb9c607eefb571ddb0c5e95b | |
| parent | 4a5cf16a368bf513a2c2e3b27821a37d3df3cf89 (diff) | |
| download | busybox-c9cdeaa3fef3f93eb259957d36c760ec8902e0c1.zip busybox-c9cdeaa3fef3f93eb259957d36c760ec8902e0c1.tar.gz | |
add compile-time check for correct DHCP packet size
| -rw-r--r-- | networking/udhcp/packet.c | 4 |
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) { |