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dhcpc: cope with buggy DHCP servers which send oversized packets

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(Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn@axis.com>)
This commit is contained in:
Denis Vlasenko
2007-11-25 03:15:24 +00:00
parent a8875efa85
commit 72e76044cf
3 changed files with 27 additions and 3 deletions
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6
networking/udhcp/common.h
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@@ -21,6 +21,8 @@ extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
#include <netinet/udp.h>
#include <netinet/ip.h>
#define DHCP_OPTIONS_BUFSIZE 308
struct dhcpMessage {
uint8_t op;
uint8_t htype;
@@ -37,7 +39,7 @@ struct dhcpMessage {
uint8_t sname[64];
uint8_t file[128];
uint32_t cookie;
uint8_t options[308]; /* 312 - cookie */
uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
} ATTRIBUTE_PACKED;
struct udp_dhcp_packet {
@@ -49,7 +51,7 @@ struct udp_dhcp_packet {
/* Let's see whether compiler understood us right */
struct BUG_bad_sizeof_struct_udp_dhcp_packet {
char BUG_bad_sizeof_struct_udp_dhcp_packet
[sizeof(struct udp_dhcp_packet) != 576 ? -1 : 1];
[(sizeof(struct udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
};
void udhcp_init_header(struct dhcpMessage *packet, char type);