117 lines
3.8 KiB
C
117 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
|
|
/* DNS resolver interface definitions.
|
|
*
|
|
* Copyright (C) 2018 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _UAPI_LINUX_DNS_RESOLVER_H
|
|
#define _UAPI_LINUX_DNS_RESOLVER_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/*
|
|
* Type of payload.
|
|
*/
|
|
enum dns_payload_content_type {
|
|
DNS_PAYLOAD_IS_SERVER_LIST = 0, /* List of servers, requested by srv=1 */
|
|
};
|
|
|
|
/*
|
|
* Type of address that might be found in an address record.
|
|
*/
|
|
enum dns_payload_address_type {
|
|
DNS_ADDRESS_IS_IPV4 = 0, /* 4-byte AF_INET address */
|
|
DNS_ADDRESS_IS_IPV6 = 1, /* 16-byte AF_INET6 address */
|
|
};
|
|
|
|
/*
|
|
* Type of protocol used to access a server.
|
|
*/
|
|
enum dns_payload_protocol_type {
|
|
DNS_SERVER_PROTOCOL_UNSPECIFIED = 0,
|
|
DNS_SERVER_PROTOCOL_UDP = 1, /* Use UDP to talk to the server */
|
|
DNS_SERVER_PROTOCOL_TCP = 2, /* Use TCP to talk to the server */
|
|
};
|
|
|
|
/*
|
|
* Source of record included in DNS resolver payload.
|
|
*/
|
|
enum dns_record_source {
|
|
DNS_RECORD_UNAVAILABLE = 0, /* No source available (empty record) */
|
|
DNS_RECORD_FROM_CONFIG = 1, /* From local configuration data */
|
|
DNS_RECORD_FROM_DNS_A = 2, /* From DNS A or AAAA record */
|
|
DNS_RECORD_FROM_DNS_AFSDB = 3, /* From DNS AFSDB record */
|
|
DNS_RECORD_FROM_DNS_SRV = 4, /* From DNS SRV record */
|
|
DNS_RECORD_FROM_NSS = 5, /* From NSS */
|
|
NR__dns_record_source
|
|
};
|
|
|
|
/*
|
|
* Status of record included in DNS resolver payload.
|
|
*/
|
|
enum dns_lookup_status {
|
|
DNS_LOOKUP_NOT_DONE = 0, /* No lookup has been made */
|
|
DNS_LOOKUP_GOOD = 1, /* Good records obtained */
|
|
DNS_LOOKUP_GOOD_WITH_BAD = 2, /* Good records, some decoding errors */
|
|
DNS_LOOKUP_BAD = 3, /* Couldn't decode results */
|
|
DNS_LOOKUP_GOT_NOT_FOUND = 4, /* Got a "Not Found" result */
|
|
DNS_LOOKUP_GOT_LOCAL_FAILURE = 5, /* Local failure during lookup */
|
|
DNS_LOOKUP_GOT_TEMP_FAILURE = 6, /* Temporary failure during lookup */
|
|
DNS_LOOKUP_GOT_NS_FAILURE = 7, /* Name server failure */
|
|
NR__dns_lookup_status
|
|
};
|
|
|
|
/*
|
|
* Header at the beginning of binary format payload.
|
|
*/
|
|
struct dns_payload_header {
|
|
__u8 zero; /* Zero byte: marks this as not being text */
|
|
__u8 content; /* enum dns_payload_content_type */
|
|
__u8 version; /* Encoding version */
|
|
} __packed;
|
|
|
|
/*
|
|
* Header at the beginning of a V1 server list. This is followed directly by
|
|
* the server records. Each server records begins with a struct of type
|
|
* dns_server_list_v1_server.
|
|
*/
|
|
struct dns_server_list_v1_header {
|
|
struct dns_payload_header hdr;
|
|
__u8 source; /* enum dns_record_source */
|
|
__u8 status; /* enum dns_lookup_status */
|
|
__u8 nr_servers; /* Number of server records following this */
|
|
} __packed;
|
|
|
|
/*
|
|
* Header at the beginning of each V1 server record. This is followed by the
|
|
* characters of the name with no NUL-terminator, followed by the address
|
|
* records for that server. Each address record begins with a struct of type
|
|
* struct dns_server_list_v1_address.
|
|
*/
|
|
struct dns_server_list_v1_server {
|
|
__u16 name_len; /* Length of name (LE) */
|
|
__u16 priority; /* Priority (as SRV record) (LE) */
|
|
__u16 weight; /* Weight (as SRV record) (LE) */
|
|
__u16 port; /* UDP/TCP port number (LE) */
|
|
__u8 source; /* enum dns_record_source */
|
|
__u8 status; /* enum dns_lookup_status */
|
|
__u8 protocol; /* enum dns_payload_protocol_type */
|
|
__u8 nr_addrs;
|
|
} __packed;
|
|
|
|
/*
|
|
* Header at the beginning of each V1 address record. This is followed by the
|
|
* bytes of the address, 4 for IPV4 and 16 for IPV6.
|
|
*/
|
|
struct dns_server_list_v1_address {
|
|
__u8 address_type; /* enum dns_payload_address_type */
|
|
} __packed;
|
|
|
|
#endif /* _UAPI_LINUX_DNS_RESOLVER_H */
|