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Added dhcp_ipv4_option() and friends.

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Added test code to configure the interface for IPv4 after DHCP.
This commit is contained in:
Michael Brown 2006-07-20 02:49:59 +00:00
parent 6a0b4c9772
commit 00a1f000b1
3 changed files with 102 additions and 1 deletions
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7
src/include/gpxe/dhcp.h
View File

@ -250,6 +250,7 @@ struct dhcp_option {
uint8_t byte;
uint16_t word;
uint32_t dword;
struct in_addr in;
uint8_t bytes[0];
} data;
} __attribute__ (( packed ));
@ -429,6 +430,8 @@ struct dhcp_session {
};
extern unsigned long dhcp_num_option ( struct dhcp_option *option );
extern void dhcp_ipv4_option ( struct dhcp_option *option,
struct in_addr *inp );
extern struct dhcp_option *
find_dhcp_option ( struct dhcp_option_block *options, unsigned int tag );
extern void register_dhcp_options ( struct dhcp_option_block *options );
@ -444,6 +447,10 @@ extern struct dhcp_option * find_global_dhcp_option ( unsigned int tag );
extern unsigned long find_dhcp_num_option ( struct dhcp_option_block *options,
unsigned int tag );
extern unsigned long find_global_dhcp_num_option ( unsigned int tag );
extern void find_dhcp_ipv4_option ( struct dhcp_option_block *options,
unsigned int tag, struct in_addr *inp );
extern void find_global_dhcp_ipv4_option ( unsigned int tag,
struct in_addr *inp );
extern void delete_dhcp_option ( struct dhcp_option_block *options,
unsigned int tag );

55
src/net/dhcpopts.c
View File

@ -24,6 +24,7 @@
#include <assert.h>
#include <vsprintf.h>
#include <gpxe/list.h>
#include <gpxe/in.h>
#include <gpxe/dhcp.h>
/** @file
@ -85,6 +86,21 @@ unsigned long dhcp_num_option ( struct dhcp_option *option ) {
return value;
}
/**
* Obtain value of an IPv4-address DHCP option
*
* @v option DHCP option, or NULL
* @v inp IPv4 address to fill in
*
* Parses the IPv4 address value from a DHCP option, if present. It
* is permitted to call dhcp_ipv4_option() with @c option set to NULL;
* in this case the address will be set to 0.0.0.0.
*/
void dhcp_ipv4_option ( struct dhcp_option *option, struct in_addr *inp ) {
if ( option )
*inp = option->data.in;
}
/**
* Calculate length of a normal DHCP option
*
@ -460,6 +476,45 @@ unsigned long find_global_dhcp_num_option ( unsigned int tag ) {
return dhcp_num_option ( find_global_dhcp_option ( tag ) );
}
/**
* Find DHCP IPv4-address option, and return its value
*
* @v options DHCP options block
* @v tag DHCP option tag to search for
* @v inp IPv4 address to fill in
* @ret value Numerical value of the option, or 0 if not found
*
* This function exists merely as a notational shorthand for a call to
* find_dhcp_option() followed by a call to dhcp_ipv4_option(). It is
* not possible to distinguish between the cases "option not found"
* and "option has a value of 0.0.0.0" using this function; if this
* matters to you then issue the two constituent calls directly and
* check that find_dhcp_option() returns a non-NULL value.
*/
void find_dhcp_ipv4_option ( struct dhcp_option_block *options,
unsigned int tag, struct in_addr *inp ) {
dhcp_ipv4_option ( find_dhcp_option ( options, tag ), inp );
}
/**
* Find DHCP IPv4-address option, and return its value
*
* @v options DHCP options block
* @v tag DHCP option tag to search for
* @v inp IPv4 address to fill in
* @ret value Numerical value of the option, or 0 if not found
*
* This function exists merely as a notational shorthand for a call to
* find_dhcp_option() followed by a call to dhcp_ipv4_option(). It is
* not possible to distinguish between the cases "option not found"
* and "option has a value of 0.0.0.0" using this function; if this
* matters to you then issue the two constituent calls directly and
* check that find_dhcp_option() returns a non-NULL value.
*/
void find_global_dhcp_ipv4_option ( unsigned int tag, struct in_addr *inp ) {
dhcp_ipv4_option ( find_global_dhcp_option ( tag ), inp );
}
/**
* Delete DHCP option
*

41
src/tests/dhcptest.c
View File

@ -1,10 +1,49 @@
#include <string.h>
#include <vsprintf.h>
#include <byteswap.h>
#include <gpxe/ip.h>
#include <gpxe/dhcp.h>
int test_dhcp ( struct net_device *netdev ) {
struct dhcp_session dhcp;
struct in_addr address = { htonl ( 0 ) };
struct in_addr netmask = { htonl ( 0 ) };
struct in_addr gateway = { INADDR_NONE };
int rc;
/* Bring IP interface up with address 0.0.0.0 */
if ( ( rc = add_ipv4_address ( netdev, address, netmask,
gateway ) ) != 0 )
goto out_no_del_ipv4;
/* Issue DHCP request */
memset ( &dhcp, 0, sizeof ( dhcp ) );
dhcp.netdev = netdev;
return async_wait ( start_dhcp ( &dhcp ) );
if ( ( rc = async_wait ( start_dhcp ( &dhcp ) ) ) != 0 )
goto out_no_options;
/* Retrieve IP address configuration */
find_dhcp_ipv4_option ( dhcp.options, DHCP_EB_YIADDR, &address );
find_dhcp_ipv4_option ( dhcp.options, DHCP_SUBNET_MASK, &netmask );
find_dhcp_ipv4_option ( dhcp.options, DHCP_ROUTERS, &gateway );
/* Remove old IP address configuration */
del_ipv4_address ( netdev );
/* Set up new IP address configuration */
if ( ( rc = add_ipv4_address ( netdev, address, netmask,
gateway ) ) != 0 )
goto out_no_del_ipv4;
printf ( "IP %s", inet_ntoa ( address ) );
printf ( " netmask %s", inet_ntoa ( netmask ) );
printf ( " gateway %s\n", inet_ntoa ( gateway ) );
/* Free DHCP options */
free_dhcp_options ( dhcp.options );
out_no_options:
/* Take down IP interface */
del_ipv4_address ( netdev );
out_no_del_ipv4:
return rc;
}