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[dhcp] Accept filename via DHCP option 67 as well as BOOTP filename field

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Allow options with dedicated BOOTP fields to fall back to using the
equivalent DHCP option if the relevant field is empty.
This commit is contained in:
Michael Brown 2009-04-15 21:08:02 +01:00
parent cc4363acca
commit b363d19a16
1 changed files with 8 additions and 4 deletions
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12
src/net/dhcppkt.c
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@ -155,6 +155,8 @@ int dhcppkt_store ( struct dhcp_packet *dhcppkt, unsigned int tag,
memset ( field_data, 0, field->len );
memcpy ( dhcp_packet_field ( dhcppkt->dhcphdr, field ),
data, len );
/* Erase any equivalent option from the options block */
dhcpopt_store ( &dhcppkt->options, tag, NULL, 0 );
return 0;
}
@ -181,14 +183,16 @@ int dhcppkt_fetch ( struct dhcp_packet *dhcppkt, unsigned int tag,
void *data, size_t len ) {
struct dhcp_packet_field *field;
void *field_data;
size_t field_len;
size_t field_len = 0;
/* If this is a special field, return it */
/* Identify special field, if any */
if ( ( field = find_dhcp_packet_field ( tag ) ) != NULL ) {
field_data = dhcp_packet_field ( dhcppkt->dhcphdr, field );
field_len = field->used_len ( field_data, field->len );
if ( ! field_len )
return -ENOENT;
}
/* Return special field, if it exists and is populated */
if ( field_len ) {
if ( len > field_len )
len = field_len;
memcpy ( data, field_data, len );