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Add concept of DHCP option applicators.

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This commit is contained in:
Michael Brown
2007-07-05 18:38:14 +01:00
parent d64e1be1f8
commit 1567b69895
4 changed files with 97 additions and 28 deletions
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49
src/net/dhcpopts.c
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@@ -25,6 +25,7 @@
#include <assert.h>
#include <gpxe/list.h>
#include <gpxe/in.h>
#include <gpxe/uri.h>
#include <gpxe/dhcp.h>
/** @file
@@ -36,6 +37,12 @@
/** List of registered DHCP option blocks */
static LIST_HEAD ( option_blocks );
/** Registered DHCP option applicators */
static struct dhcp_option_applicator dhcp_option_applicators[0]
__table_start ( struct dhcp_option_applicator, dhcp_applicators );
static struct dhcp_option_applicator dhcp_option_applicators_end[0]
__table_end ( struct dhcp_option_applicator, dhcp_applicators );
/**
* Obtain printable version of a DHCP option tag
*
@@ -560,3 +567,45 @@ void delete_dhcp_option ( struct dhcp_option_block *options,
unsigned int tag ) {
set_dhcp_option ( options, tag, NULL, 0 );
}
/**
* Apply DHCP options
*
* @v options DHCP options block, or NULL
* @ret rc Return status code
*/
int apply_dhcp_options ( struct dhcp_option_block *options ) {
struct dhcp_option_applicator *applicator;
struct dhcp_option *option;
struct in_addr tftp_server;
struct uri *uri;
char uri_string[32];
unsigned int tag;
int rc;
/* Set current working URI based on TFTP server */
find_dhcp_ipv4_option ( options, DHCP_EB_SIADDR, &tftp_server );
snprintf ( uri_string, sizeof ( uri_string ),
"tftp://%s/", inet_ntoa ( tftp_server ) );
uri = parse_uri ( uri_string );
if ( ! uri )
return -ENOMEM;
churi ( uri );
uri_put ( uri );
/* Call all registered DHCP option applicators */
for ( applicator = dhcp_option_applicators ;
applicator < dhcp_option_applicators_end ; applicator++ ) {
tag = applicator->tag;
option = find_dhcp_option ( options, tag );
if ( ! option )
continue;
if ( ( rc = applicator->apply ( tag, option ) ) != 0 ) {
DBG ( "Could not apply DHCP option %s: %s\n",
dhcp_tag_name ( tag ), strerror ( rc ) );
return rc;
}
}
return 0;
}