source: bootcd/isolinux/syslinux-6.03/gpxe/src/include/gpxe/resolv.h

Last change on this file was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago

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File size: 4.5 KB
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[e16e8f2]1#ifndef _GPXE_RESOLV_H
2#define _GPXE_RESOLV_H
3
4/** @file
5 *
6 * Name resolution
7 *
8 */
9
10FILE_LICENCE ( GPL2_OR_LATER );
11
12#include <gpxe/refcnt.h>
13#include <gpxe/interface.h>
14#include <gpxe/tables.h>
15#include <gpxe/socket.h>
16
17struct resolv_interface;
18
19/** Name resolution interface operations */
20struct resolv_interface_operations {
21        /** Name resolution completed
22         *
23         * @v resolv            Name resolution interface
24         * @v sa                Completed socket address (if successful)
25         * @v rc                Final status code
26         */
27        void ( * done ) ( struct resolv_interface *resolv,
28                          struct sockaddr *sa, int rc );
29};
30
31/** A name resolution interface */
32struct resolv_interface {
33        /** Generic object communication interface */
34        struct interface intf;
35        /** Operations for received messages */
36        struct resolv_interface_operations *op;
37};
38
39extern struct resolv_interface null_resolv;
40extern struct resolv_interface_operations null_resolv_ops;
41
42/**
43 * Initialise a name resolution interface
44 *
45 * @v resolv            Name resolution interface
46 * @v op                Name resolution interface operations
47 * @v refcnt            Containing object reference counter, or NULL
48 */
49static inline void resolv_init ( struct resolv_interface *resolv,
50                                 struct resolv_interface_operations *op,
51                                 struct refcnt *refcnt ) {
52        resolv->intf.dest = &null_resolv.intf;
53        resolv->intf.refcnt = refcnt;
54        resolv->op = op;
55}
56
57/**
58 * Get name resolution interface from generic object communication interface
59 *
60 * @v intf              Generic object communication interface
61 * @ret resolv          Name resolution interface
62 */
63static inline __attribute__ (( always_inline )) struct resolv_interface *
64intf_to_resolv ( struct interface *intf ) {
65        return container_of ( intf, struct resolv_interface, intf );
66}
67
68/**
69 * Get reference to destination name resolution interface
70 *
71 * @v resolv            Name resolution interface
72 * @ret dest            Destination interface
73 */
74static inline __attribute__ (( always_inline )) struct resolv_interface *
75resolv_get_dest ( struct resolv_interface *resolv ) {
76        return intf_to_resolv ( intf_get ( resolv->intf.dest ) );
77}
78
79/**
80 * Drop reference to name resolution interface
81 *
82 * @v resolv            name resolution interface
83 */
84static inline __attribute__ (( always_inline )) void
85resolv_put ( struct resolv_interface *resolv ) {
86        intf_put ( &resolv->intf );
87}
88
89/**
90 * Plug a name resolution interface into a new destination interface
91 *
92 * @v resolv            Name resolution interface
93 * @v dest              New destination interface
94 */
95static inline __attribute__ (( always_inline )) void
96resolv_plug ( struct resolv_interface *resolv, struct resolv_interface *dest ) {
97        plug ( &resolv->intf, &dest->intf );
98}
99
100/**
101 * Plug two name resolution interfaces together
102 *
103 * @v a                 Name resolution interface A
104 * @v b                 Name resolution interface B
105 */
106static inline __attribute__ (( always_inline )) void
107resolv_plug_plug ( struct resolv_interface *a, struct resolv_interface *b ) {
108        plug_plug ( &a->intf, &b->intf );
109}
110
111/**
112 * Unplug a name resolution interface
113 *
114 * @v resolv            Name resolution interface
115 */
116static inline __attribute__ (( always_inline )) void
117resolv_unplug ( struct resolv_interface *resolv ) {
118        plug ( &resolv->intf, &null_resolv.intf );
119}
120
121/**
122 * Stop using a name resolution interface
123 *
124 * @v resolv            Name resolution interface
125 *
126 * After calling this method, no further messages will be received via
127 * the interface.
128 */
129static inline void resolv_nullify ( struct resolv_interface *resolv ) {
130        resolv->op = &null_resolv_ops;
131};
132
133/** A name resolver */
134struct resolver {
135        /** Name of this resolver (e.g. "DNS") */
136        const char *name;
137        /** Start name resolution
138         *
139         * @v resolv            Name resolution interface
140         * @v name              Name to resolve
141         * @v sa                Socket address to complete
142         * @ret rc              Return status code
143         */
144        int ( * resolv ) ( struct resolv_interface *resolv, const char *name,
145                           struct sockaddr *sa );
146};
147
148/** Numeric resolver priority */
149#define RESOLV_NUMERIC 01
150
151/** Normal resolver priority */
152#define RESOLV_NORMAL 02
153
154/** Resolvers table */
155#define RESOLVERS __table ( struct resolver, "resolvers" )
156
157/** Register as a name resolver */
158#define __resolver( resolv_order ) __table_entry ( RESOLVERS, resolv_order )
159
160extern void resolv_done ( struct resolv_interface *resolv,
161                          struct sockaddr *sa, int rc );
162extern void ignore_resolv_done ( struct resolv_interface *resolv,
163                          struct sockaddr *sa, int rc );
164extern struct resolv_interface_operations null_resolv_ops;
165extern struct resolv_interface null_resolv;
166
167extern int resolv ( struct resolv_interface *resolv, const char *name,
168                    struct sockaddr *sa );
169
170#endif /* _GPXE_RESOLV_H */
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