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[dhcp] Allow DHCP non-option settings to be cleared

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dhcppkt_store() is supposed to clear the setting if passed NULL for the
setting data.  In the case of fixed-location fields (e.g. client IP
address), this requires setting the content of the field to all-zeros.
This commit is contained in:
Michael Brown 2008-07-08 01:13:59 +01:00
parent 3ad348e55a
commit 2df682c5be
1 changed files with 3 additions and 0 deletions
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3
src/net/dhcppkt.c
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@ -138,12 +138,15 @@ find_dhcp_packet_field ( unsigned int tag ) {
int dhcppkt_store ( struct dhcp_packet *dhcppkt, unsigned int tag,
const void *data, size_t len ) {
struct dhcp_packet_field *field;
void *field_data;
int rc;
/* If this is a special field, fill it in */
if ( ( field = find_dhcp_packet_field ( tag ) ) != NULL ) {
if ( len > field->len )
return -ENOSPC;
field_data = dhcp_packet_field ( dhcppkt->dhcphdr, field );
memset ( field_data, 0, field->len );
memcpy ( dhcp_packet_field ( dhcppkt->dhcphdr, field ),
data, len );
return 0;