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Have DHCP set the nameserver, rather than DNS read the DHCP nameserver

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value.
This commit is contained in:
Michael Brown 2007-01-18 21:22:03 +00:00
parent c014f607a8
commit 075f8144ff
2 changed files with 18 additions and 12 deletions
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2
src/include/gpxe/dns.h
View File

@ -109,6 +109,8 @@ struct dns_request {
struct retry_timer timer;
};
extern struct in_addr nameserver;
extern int dns_resolv ( const char *name, struct sockaddr *sa,
struct async *parent );

28
src/net/udp/dns.c
View File

@ -26,7 +26,6 @@
#include <byteswap.h>
#include <gpxe/async.h>
#include <gpxe/udp.h>
#include <gpxe/dhcp.h>
#include <gpxe/dns.h>
/** @file
@ -35,6 +34,9 @@
*
*/
/* The DNS server */
struct in_addr nameserver = { INADDR_NONE };
/**
* Compare DNS reply name against the query name from the original request
*
@ -51,7 +53,7 @@ static int dns_name_cmp ( struct dns_request *dns, struct dns_header *reply,
while ( 1 ) {
/* Obtain next section of rname */
while ( ( *rname ) & 0xc0 ) {
while ( ( *rname ) & 0xc0 ) {
rname = ( ( ( char * ) reply ) +
( ntohs( *((uint16_t *)rname) ) & ~0xc000 ));
}
@ -402,16 +404,18 @@ static struct async_operations dns_async_operations = {
/**
* Resolve name using DNS
*
* @v name Host name to resolve
* @v sa Socket address to fill in
* @v parent Parent asynchronous operation
* @ret rc Return status code
*/
int dns_resolv ( const char *name, struct sockaddr *sa,
struct async *parent ) {
struct dns_request *dns;
struct dhcp_option *option;
union {
struct sockaddr_tcpip st;
struct sockaddr_in sin;
} nameserver;
} server;
int rc;
/* Allocate DNS structure */
@ -435,20 +439,20 @@ int dns_resolv ( const char *name, struct sockaddr *sa,
dns->qinfo->qclass = htons ( DNS_CLASS_IN );
/* Identify nameserver */
memset ( &nameserver, 0, sizeof ( nameserver ) );
nameserver.sin.sin_family = AF_INET;
nameserver.sin.sin_port = htons ( DNS_PORT );
if ( ! ( option = find_global_dhcp_option ( DHCP_DNS_SERVERS ) ) ) {
memset ( &server, 0, sizeof ( server ) );
server.sin.sin_family = AF_INET;
server.sin.sin_port = htons ( DNS_PORT );
server.sin.sin_addr = nameserver;
if ( server.sin.sin_addr.s_addr == INADDR_NONE ) {
DBGC ( dns, "DNS %p no name servers\n", dns );
rc = -ENXIO;
goto err;
}
dhcp_ipv4_option ( option, &nameserver.sin.sin_addr );
/* Open UDP connection */
DBGC ( dns, "DNS %p using nameserver %s\n", dns,
inet_ntoa ( nameserver.sin.sin_addr ) );
udp_connect ( &dns->udp, &nameserver.st );
inet_ntoa ( server.sin.sin_addr ) );
udp_connect ( &dns->udp, &server.st );
if ( ( rc = udp_open ( &dns->udp, 0 ) ) != 0 )
goto err;