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Don't build option-overloaded packets; they just confuse people (ISC

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DHCPD and Windows RIS in particular).
This commit is contained in:
Michael Brown
2007-06-30 01:32:53 +01:00
parent 9125070f51
commit acd598b4f9
3 changed files with 23 additions and 55 deletions
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42
src/net/udp/dhcp.c
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@@ -138,7 +138,7 @@ static int set_dhcp_packet_option ( struct dhcp_packet *dhcppkt,
unsigned int tag, const void *data,
size_t len ) {
struct dhcphdr *dhcphdr = dhcppkt->dhcphdr;
struct dhcp_option_block *options = dhcppkt->options;
struct dhcp_option_block *options = &dhcppkt->options;
struct dhcp_option *option = NULL;
/* Special-case the magic options */
@@ -152,31 +152,23 @@ static int set_dhcp_packet_option ( struct dhcp_packet *dhcppkt,
case DHCP_EB_SIADDR:
memcpy ( &dhcphdr->siaddr, data, sizeof ( dhcphdr->siaddr ) );
return 0;
case DHCP_MESSAGE_TYPE:
case DHCP_REQUESTED_ADDRESS:
case DHCP_PARAMETER_REQUEST_LIST:
/* These options have to be within the main options
* block. This doesn't seem to be required by the
* RFCs, but at least ISC dhcpd refuses to recognise
* them otherwise.
*/
options = &dhcppkt->options[OPTS_MAIN];
break;
case DHCP_TFTP_SERVER_NAME:
strncpy ( dhcphdr->sname, data, sizeof ( dhcphdr->sname ) );
return 0;
case DHCP_BOOTFILE_NAME:
strncpy ( dhcphdr->file, data, sizeof ( dhcphdr->file ) );
return 0;
default:
/* Continue processing as normal */
break;
}
/* Set option in first available options block */
for ( ; options < &dhcppkt->options[NUM_OPT_BLOCKS] ; options++ ) {
option = set_dhcp_option ( options, tag, data, len );
if ( option )
break;
}
/* Set option */
option = set_dhcp_option ( options, tag, data, len );
/* Update DHCP packet length */
dhcppkt->len = ( offsetof ( typeof ( *dhcppkt->dhcphdr ), options )
+ dhcppkt->options[OPTS_MAIN].len );
+ dhcppkt->options.len );
return ( option ? 0 : -ENOSPC );
}
@@ -296,8 +288,6 @@ int create_dhcp_packet ( struct net_device *netdev, uint8_t msgtype,
void *data, size_t max_len,
struct dhcp_packet *dhcppkt ) {
struct dhcphdr *dhcphdr = data;
static const uint8_t overloading = ( DHCP_OPTION_OVERLOAD_FILE |
DHCP_OPTION_OVERLOAD_SNAME );
int rc;
/* Sanity check */
@@ -316,20 +306,10 @@ int create_dhcp_packet ( struct net_device *netdev, uint8_t msgtype,
/* Initialise DHCP packet structure */
dhcppkt->dhcphdr = dhcphdr;
dhcppkt->max_len = max_len;
init_dhcp_options ( &dhcppkt->options[OPTS_MAIN], dhcphdr->options,
init_dhcp_options ( &dhcppkt->options, dhcphdr->options,
( max_len -
offsetof ( typeof ( *dhcphdr ), options ) ) );
init_dhcp_options ( &dhcppkt->options[OPTS_FILE], dhcphdr->file,
sizeof ( dhcphdr->file ) );
init_dhcp_options ( &dhcppkt->options[OPTS_SNAME], dhcphdr->sname,
sizeof ( dhcphdr->sname ) );
/* Set DHCP_OPTION_OVERLOAD option within the main options block */
if ( set_dhcp_option ( &dhcppkt->options[OPTS_MAIN],
DHCP_OPTION_OVERLOAD, &overloading,
sizeof ( overloading ) ) == NULL )
return -ENOSPC;
/* Set DHCP_MESSAGE_TYPE option */
if ( ( rc = set_dhcp_packet_option ( dhcppkt, DHCP_MESSAGE_TYPE,
&msgtype,