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A working DNS resolver (not yet tied in to anything)

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This commit is contained in:
Michael Brown
2007-01-15 17:31:35 +00:00
parent df0397f334
commit 9af12d5fba
6 changed files with 509 additions and 385 deletions
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1
src/include/errno.h
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@@ -137,6 +137,7 @@
#define EINVAL 0xdd /**< Invalid argument */
#define EIO 0xde /**< Input/output error */
#define EISCONN 0xdf /**< Transport endpoint is already connected */
#define ELOOP 0xf8 /**< Too many symbolic links */
#define EMFILE 0xe0 /**< Too many open files */
#define EMSGSIZE 0xe1 /**< Message too long */
#define ENAMETOOLONG 0xe2 /**< File name too long */

61
src/include/dns.h → src/include/gpxe/dns.h
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@@ -1,10 +1,16 @@
#ifndef DNS_RESOLVER_H
#define DNS_RESOLVER_H
#ifndef _GPXE_DNS_H
#define _GPXE_DNS_H
#include "stdint.h"
/** @file
*
* DNS protocol
*
*/
#include <stdint.h>
#include <gpxe/in.h>
#include "ip.h"
#include "udp.h"
#include <gpxe/async.h>
#include <gpxe/retry.h>
/*
* Constants
@@ -33,7 +39,7 @@
#define DNS_FLAG_RCODE_NX ( 0x03 << 0 )
#define DNS_FLAG_RCODE(flags) ( (flags) & ( 0x0f << 0 ) )
#define DNS_UDP_PORT 53
#define DNS_PORT 53
#define DNS_MAX_RETRIES 3
#define DNS_MAX_CNAME_RECURSION 0x30
@@ -56,13 +62,11 @@ struct dns_query_info {
} __attribute__ (( packed ));
struct dns_query {
struct iphdr ip;
struct udphdr udp;
struct dns_header dns;
char payload[ 256 + sizeof ( struct dns_query_info ) ];
} __attribute__ (( packed ));
struct dns_rr_info {
struct dns_rr_info_common {
uint16_t type;
uint16_t class;
uint32_t ttl;
@@ -70,23 +74,36 @@ struct dns_rr_info {
} __attribute__ (( packed ));
struct dns_rr_info_a {
struct dns_rr_info info;
struct dns_rr_info_common common;
struct in_addr in_addr;
} __attribute__ (( packed ));
struct dns_rr_info_cname {
struct dns_rr_info info;
char cname[0];
struct dns_rr_info_common common;
char cname[0];
} __attribute__ (( packed ));
/*
* Functions in dns.c (used by nmb.c)
*
*/
extern struct dns_header * dns_query ( struct dns_query *query,
unsigned int query_len,
struct sockaddr_in *nameserver );
extern struct dns_rr_info * dns_find_rr ( struct dns_query *query,
struct dns_header *reply );
union dns_rr_info {
struct dns_rr_info_common common;
struct dns_rr_info_a a;
struct dns_rr_info_cname cname;
};
#endif /* DNS_RESOLVER_H */
struct dns_request {
struct sockaddr_tcpip *st;
struct async async;
struct dns_query query;
struct dns_query_info *qinfo;
unsigned int recursion;
struct udp_connection udp;
struct retry_timer timer;
};
extern int dns_resolv ( const char *name, struct sockaddr_tcpip *st,
struct async *parent );
#endif /* _GPXE_DNS_H */

2
src/include/nmb.h
View File

@@ -1,7 +1,7 @@
#ifndef NMB_H
#define NMB_H
#include "dns.h"
#include <gpxe/dns.h>
/*
* NetBIOS name query packets are basically the same as DNS packets,