1 files changed, 0 insertions, 603 deletions

diff --git a/gpxe/src/net/udp/dns.c b/gpxe/src/net/udp/dns.c
deleted file mode 100644
index f94094aa..00000000
--- a/gpxe/src/net/udp/dns.c
+++ /dev/null
@@ -1,603 +0,0 @@
-/*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * Portions copyright (C) 2004 Anselm M. Hoffmeister
- * <stockholm@users.sourceforge.net>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-FILE_LICENCE ( GPL2_OR_LATER );
-
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <errno.h>
-#include <byteswap.h>
-#include <gpxe/refcnt.h>
-#include <gpxe/xfer.h>
-#include <gpxe/open.h>
-#include <gpxe/resolv.h>
-#include <gpxe/retry.h>
-#include <gpxe/tcpip.h>
-#include <gpxe/settings.h>
-#include <gpxe/features.h>
-#include <gpxe/dns.h>
-
-/** @file
- *
- * DNS protocol
- *
- */
-
-FEATURE ( FEATURE_PROTOCOL, "DNS", DHCP_EB_FEATURE_DNS, 1 );
-
-/** The DNS server */
-static struct sockaddr_tcpip nameserver = {
-	.st_port = htons ( DNS_PORT ),
-};
-
-/** The local domain */
-static char *localdomain;
-
-/** A DNS request */
-struct dns_request {
-	/** Reference counter */
-	struct refcnt refcnt;
-	/** Name resolution interface */
-	struct resolv_interface resolv;
-	/** Data transfer interface */
-	struct xfer_interface socket;
-	/** Retry timer */
-	struct retry_timer timer;
-
-	/** Socket address to fill in with resolved address */
-	struct sockaddr sa;
-	/** Current query packet */
-	struct dns_query query;
-	/** Location of query info structure within current packet
-	 *
-	 * The query info structure is located immediately after the
-	 * compressed name.
-	 */
-	struct dns_query_info *qinfo;
-	/** Recursion counter */
-	unsigned int recursion;
-};
-
-/**
- * Mark DNS request as complete
- *
- * @v dns		DNS request
- * @v rc		Return status code
- */
-static void dns_done ( struct dns_request *dns, int rc ) {
-
-	/* Stop the retry timer */
-	stop_timer ( &dns->timer );
-
-	/* Close data transfer interface */
-	xfer_nullify ( &dns->socket );
-	xfer_close ( &dns->socket, rc );
-
-	/* Mark name resolution as complete */
-	resolv_done ( &dns->resolv, &dns->sa, rc );
-}
-
-/**
- * Compare DNS reply name against the query name from the original request
- *
- * @v dns		DNS request
- * @v reply		DNS reply
- * @v rname		Reply name
- * @ret	zero		Names match
- * @ret non-zero	Names do not match
- */
-static int dns_name_cmp ( struct dns_request *dns,
-			  const struct dns_header *reply, 
-			  const char *rname ) {
-	const char *qname = dns->query.payload;
-	int i;
-
-	while ( 1 ) {
-		/* Obtain next section of rname */
-		while ( ( *rname ) & 0xc0 ) {
-			rname = ( ( ( char * ) reply ) +
-				  ( ntohs( *((uint16_t *)rname) ) & ~0xc000 ));
-		}
-		/* Check that lengths match */
-		if ( *rname != *qname )
-			return -1;
-		/* If length is zero, we have reached the end */
-		if ( ! *qname )
-			return 0;
-		/* Check that data matches */
-		for ( i = *qname + 1; i > 0 ; i-- ) {
-			if ( *(rname++) != *(qname++) )
-				return -1;
-		}
-	}
-}
-
-/**
- * Skip over a (possibly compressed) DNS name
- *
- * @v name		DNS name
- * @ret name		Next DNS name
- */
-static const char * dns_skip_name ( const char *name ) {
-	while ( 1 ) {
-		if ( ! *name ) {
-			/* End of name */
-			return ( name + 1);
-		}
-		if ( *name & 0xc0 ) {
-			/* Start of a compressed name */
-			return ( name + 2 );
-		}
-		/* Uncompressed name portion */
-		name += *name + 1;
-	}
-}
-
-/**
- * Find an RR in a reply packet corresponding to our query
- *
- * @v dns		DNS request
- * @v reply		DNS reply
- * @ret rr		DNS RR, or NULL if not found
- */
-static union dns_rr_info * dns_find_rr ( struct dns_request *dns,
-					 const struct dns_header *reply ) {
-	int i, cmp;
-	const char *p = ( ( char * ) reply ) + sizeof ( struct dns_header );
-	union dns_rr_info *rr_info;
-
-	/* Skip over the questions section */
-	for ( i = ntohs ( reply->qdcount ) ; i > 0 ; i-- ) {
-		p = dns_skip_name ( p ) + sizeof ( struct dns_query_info );
-	}
-
-	/* Process the answers section */
-	for ( i = ntohs ( reply->ancount ) ; i > 0 ; i-- ) {
-		cmp = dns_name_cmp ( dns, reply, p );
-		p = dns_skip_name ( p );
-		rr_info = ( ( union dns_rr_info * ) p );
-		if ( cmp == 0 )
-			return rr_info;
-		p += ( sizeof ( rr_info->common ) +
-		       ntohs ( rr_info->common.rdlength ) );
-	}
-
-	return NULL;
-}
-
-/**
- * Append DHCP domain name if available and name is not fully qualified
- *
- * @v string		Name as a NUL-terminated string
- * @ret fqdn		Fully-qualified domain name, malloc'd copy
- *
- * The caller must free fqdn which is allocated even if the name is already
- * fully qualified.
- */
-static char * dns_qualify_name ( const char *string ) {
-	char *fqdn;
-
-	/* Leave unchanged if already fully-qualified or no local domain */
-	if ( ( ! localdomain ) || ( strchr ( string, '.' ) != 0 ) )
-		return strdup ( string );
-
-	/* Append local domain to name */
-	asprintf ( &fqdn, "%s.%s", string, localdomain );
-	return fqdn;
-}
-
-/**
- * Convert a standard NUL-terminated string to a DNS name
- *
- * @v string		Name as a NUL-terminated string
- * @v buf		Buffer in which to place DNS name
- * @ret next		Byte following constructed DNS name
- *
- * DNS names consist of "<length>element" pairs.
- */
-static char * dns_make_name ( const char *string, char *buf ) {
-	char *length_byte = buf++;
-	char c;
-
-	while ( ( c = *(string++) ) ) {
-		if ( c == '.' ) {
-			*length_byte = buf - length_byte - 1;
-			length_byte = buf;
-		}
-		*(buf++) = c;
-	}
-	*length_byte = buf - length_byte - 1;
-	*(buf++) = '\0';
-	return buf;
-}
-
-/**
- * Convert an uncompressed DNS name to a NUL-terminated string
- *
- * @v name		DNS name
- * @ret string		NUL-terminated string
- *
- * Produce a printable version of a DNS name.  Used only for debugging.
- */
-static inline char * dns_unmake_name ( char *name ) {
-	char *p;
-	unsigned int len;
-
-	p = name;
-	while ( ( len = *p ) ) {
-		*(p++) = '.';
-		p += len;
-	}
-
-	return name + 1;
-}
-
-/**
- * Decompress a DNS name
- *
- * @v reply		DNS replay
- * @v name		DNS name
- * @v buf		Buffer into which to decompress DNS name
- * @ret next		Byte following decompressed DNS name
- */
-static char * dns_decompress_name ( const struct dns_header *reply,
-				    const char *name, char *buf ) {
-	int i, len;
-
-	do {
-		/* Obtain next section of name */
-		while ( ( *name ) & 0xc0 ) {
-			name = ( ( char * ) reply +
-				 ( ntohs ( *((uint16_t *)name) ) & ~0xc000 ) );
-		}
-		/* Copy data */
-		len = *name;
-		for ( i = len + 1 ; i > 0 ; i-- ) {
-			*(buf++) = *(name++);
-		}
-	} while ( len );
-	return buf;
-}
-
-/**
- * Send next packet in DNS request
- *
- * @v dns		DNS request
- */
-static int dns_send_packet ( struct dns_request *dns ) {
-	static unsigned int qid = 0;
-	size_t qlen;
-
-	/* Increment query ID */
-	dns->query.dns.id = htons ( ++qid );
-
-	DBGC ( dns, "DNS %p sending query ID %d\n", dns, qid );
-
-	/* Start retransmission timer */
-	start_timer ( &dns->timer );
-
-	/* Send the data */
-	qlen = ( ( ( void * ) dns->qinfo ) - ( ( void * ) &dns->query )
-		 + sizeof ( dns->qinfo ) );
-	return xfer_deliver_raw ( &dns->socket, &dns->query, qlen );
-}
-
-/**
- * Handle DNS retransmission timer expiry
- *
- * @v timer		Retry timer
- * @v fail		Failure indicator
- */
-static void dns_timer_expired ( struct retry_timer *timer, int fail ) {
-	struct dns_request *dns =
-		container_of ( timer, struct dns_request, timer );
-
-	if ( fail ) {
-		dns_done ( dns, -ETIMEDOUT );
-	} else {
-		dns_send_packet ( dns );
-	}
-}
-
-/**
- * Receive new data
- *
- * @v socket		UDP socket
- * @v data		DNS reply
- * @v len		Length of DNS reply
- * @ret rc		Return status code
- */
-static int dns_xfer_deliver_raw ( struct xfer_interface *socket,
-				  const void *data, size_t len ) {
-	struct dns_request *dns =
-		container_of ( socket, struct dns_request, socket );
-	const struct dns_header *reply = data;
-	union dns_rr_info *rr_info;
-	struct sockaddr_in *sin;
-	unsigned int qtype = dns->qinfo->qtype;
-
-	/* Sanity check */
-	if ( len < sizeof ( *reply ) ) {
-		DBGC ( dns, "DNS %p received underlength packet length %zd\n",
-		       dns, len );
-		return -EINVAL;
-	}
-
-	/* Check reply ID matches query ID */
-	if ( reply->id != dns->query.dns.id ) {
-		DBGC ( dns, "DNS %p received unexpected reply ID %d "
-		       "(wanted %d)\n", dns, ntohs ( reply->id ),
-		       ntohs ( dns->query.dns.id ) );
-		return -EINVAL;
-	}
-
-	DBGC ( dns, "DNS %p received reply ID %d\n", dns, ntohs ( reply->id ));
-
-	/* Stop the retry timer.  After this point, each code path
-	 * must either restart the timer by calling dns_send_packet(),
-	 * or mark the DNS operation as complete by calling
-	 * dns_done()
-	 */
-	stop_timer ( &dns->timer );
-
-	/* Search through response for useful answers.  Do this
-	 * multiple times, to take advantage of useful nameservers
-	 * which send us e.g. the CNAME *and* the A record for the
-	 * pointed-to name.
-	 */
-	while ( ( rr_info = dns_find_rr ( dns, reply ) ) ) {
-		switch ( rr_info->common.type ) {
-
-		case htons ( DNS_TYPE_A ):
-
-			/* Found the target A record */
-			DBGC ( dns, "DNS %p found address %s\n",
-			       dns, inet_ntoa ( rr_info->a.in_addr ) );
-			sin = ( struct sockaddr_in * ) &dns->sa;
-			sin->sin_family = AF_INET;
-			sin->sin_addr = rr_info->a.in_addr;
-
-			/* Mark operation as complete */
-			dns_done ( dns, 0 );
-			return 0;
-
-		case htons ( DNS_TYPE_CNAME ):
-
-			/* Found a CNAME record; update query and recurse */
-			DBGC ( dns, "DNS %p found CNAME\n", dns );
-			dns->qinfo = ( void * ) dns_decompress_name ( reply,
-							 rr_info->cname.cname,
-							 dns->query.payload );
-			dns->qinfo->qtype = htons ( DNS_TYPE_A );
-			dns->qinfo->qclass = htons ( DNS_CLASS_IN );
-			
-			/* Terminate the operation if we recurse too far */
-			if ( ++dns->recursion > DNS_MAX_CNAME_RECURSION ) {
-				DBGC ( dns, "DNS %p recursion exceeded\n",
-				       dns );
-				dns_done ( dns, -ELOOP );
-				return 0;
-			}
-			break;
-
-		default:
-			DBGC ( dns, "DNS %p got unknown record type %d\n",
-			       dns, ntohs ( rr_info->common.type ) );
-			break;
-		}
-	}
-	
-	/* Determine what to do next based on the type of query we
-	 * issued and the reponse we received
-	 */
-	switch ( qtype ) {
-
-	case htons ( DNS_TYPE_A ):
-		/* We asked for an A record and got nothing;
-		 * try the CNAME.
-		 */
-		DBGC ( dns, "DNS %p found no A record; trying CNAME\n", dns );
-		dns->qinfo->qtype = htons ( DNS_TYPE_CNAME );
-		dns_send_packet ( dns );
-		return 0;
-
-	case htons ( DNS_TYPE_CNAME ):
-		/* We asked for a CNAME record.  If we got a response
-		 * (i.e. if the next A query is already set up), then
-		 * issue it, otherwise abort.
-		 */
-		if ( dns->qinfo->qtype == htons ( DNS_TYPE_A ) ) {
-			dns_send_packet ( dns );
-			return 0;
-		} else {
-			DBGC ( dns, "DNS %p found no CNAME record\n", dns );
-			dns_done ( dns, -ENXIO );
-			return 0;
-		}
-
-	default:
-		assert ( 0 );
-		dns_done ( dns, -EINVAL );
-		return 0;
-	}
-}
-
-/**
- * Receive new data
- *
- * @v socket		UDP socket
- * @v rc		Reason for close
- */
-static void dns_xfer_close ( struct xfer_interface *socket, int rc ) {
-	struct dns_request *dns =
-		container_of ( socket, struct dns_request, socket );
-
-	if ( ! rc )
-		rc = -ECONNABORTED;
-
-	dns_done ( dns, rc );
-}
-
-/** DNS socket operations */
-static struct xfer_interface_operations dns_socket_operations = {
-	.close		= dns_xfer_close,
-	.vredirect	= xfer_vreopen,
-	.window		= unlimited_xfer_window,
-	.alloc_iob	= default_xfer_alloc_iob,
-	.deliver_iob	= xfer_deliver_as_raw,
-	.deliver_raw	= dns_xfer_deliver_raw,
-};
-
-/**
- * Resolve name using DNS
- *
- * @v resolv		Name resolution interface
- * @v name		Name to resolve
- * @v sa		Socket address to fill in
- * @ret rc		Return status code
- */
-static int dns_resolv ( struct resolv_interface *resolv,
-			const char *name, struct sockaddr *sa ) {
-	struct dns_request *dns;
-	char *fqdn;
-	int rc;
-
-	/* Fail immediately if no DNS servers */
-	if ( ! nameserver.st_family ) {
-		DBG ( "DNS not attempting to resolve \"%s\": "
-		      "no DNS servers\n", name );
-		rc = -ENXIO;
-		goto err_no_nameserver;
-	}
-
-	/* Ensure fully-qualified domain name if DHCP option was given */
-	fqdn = dns_qualify_name ( name );
-	if ( ! fqdn ) {
-		rc = -ENOMEM;
-		goto err_qualify_name;
-	}
-
-	/* Allocate DNS structure */
-	dns = zalloc ( sizeof ( *dns ) );
-	if ( ! dns ) {
-		rc = -ENOMEM;
-		goto err_alloc_dns;
-	}
-	resolv_init ( &dns->resolv, &null_resolv_ops, &dns->refcnt );
-	xfer_init ( &dns->socket, &dns_socket_operations, &dns->refcnt );
-	dns->timer.expired = dns_timer_expired;
-	memcpy ( &dns->sa, sa, sizeof ( dns->sa ) );
-
-	/* Create query */
-	dns->query.dns.flags = htons ( DNS_FLAG_QUERY | DNS_FLAG_OPCODE_QUERY |
-				       DNS_FLAG_RD );
-	dns->query.dns.qdcount = htons ( 1 );
-	dns->qinfo = ( void * ) dns_make_name ( fqdn, dns->query.payload );
-	dns->qinfo->qtype = htons ( DNS_TYPE_A );
-	dns->qinfo->qclass = htons ( DNS_CLASS_IN );
-
-	/* Open UDP connection */
-	if ( ( rc = xfer_open_socket ( &dns->socket, SOCK_DGRAM,
-				       ( struct sockaddr * ) &nameserver,
-				       NULL ) ) != 0 ) {
-		DBGC ( dns, "DNS %p could not open socket: %s\n",
-		       dns, strerror ( rc ) );
-		goto err_open_socket;
-	}
-
-	/* Send first DNS packet */
-	dns_send_packet ( dns );
-
-	/* Attach parent interface, mortalise self, and return */
-	resolv_plug_plug ( &dns->resolv, resolv );
-	ref_put ( &dns->refcnt );
-	free ( fqdn );
-	return 0;	
-
- err_open_socket:
- err_alloc_dns:
-	ref_put ( &dns->refcnt );
- err_qualify_name:
-	free ( fqdn );
- err_no_nameserver:
-	return rc;
-}
-
-/** DNS name resolver */
-struct resolver dns_resolver __resolver ( RESOLV_NORMAL ) = {
-	.name = "DNS",
-	.resolv = dns_resolv,
-};
-
-/******************************************************************************
- *
- * Settings
- *
- ******************************************************************************
- */
-
-/** DNS server setting */
-struct setting dns_setting __setting = {
-	.name = "dns",
-	.description = "DNS server",
-	.tag = DHCP_DNS_SERVERS,
-	.type = &setting_type_ipv4,
-};
-
-/** Domain name setting */
-struct setting domain_setting __setting = {
-	.name = "domain",
-	.description = "Local domain",
-	.tag = DHCP_DOMAIN_NAME,
-	.type = &setting_type_string,
-};
-
-/**
- * Apply DNS settings
- *
- * @ret rc		Return status code
- */
-static int apply_dns_settings ( void ) {
-	struct sockaddr_in *sin_nameserver =
-		( struct sockaddr_in * ) &nameserver;
-	int len;
-
-	if ( ( len = fetch_ipv4_setting ( NULL, &dns_setting,
-					  &sin_nameserver->sin_addr ) ) >= 0 ){
-		sin_nameserver->sin_family = AF_INET;
-		DBG ( "DNS using nameserver %s\n",
-		      inet_ntoa ( sin_nameserver->sin_addr ) );
-	}
-
-	/* Get local domain DHCP option */
-	if ( ( len = fetch_string_setting_copy ( NULL, &domain_setting,
-						 &localdomain ) ) >= 0 )
-		DBG ( "DNS local domain %s\n", localdomain );
-
-	return 0;
-}
-
-/** DNS settings applicator */
-struct settings_applicator dns_applicator __settings_applicator = {
-	.apply = apply_dns_settings,
-};