1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/*
* Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 2000, 2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: lwdclient.h,v 1.18 2007/06/19 23:46:59 tbox Exp $ */
#ifndef NAMED_LWDCLIENT_H
#define NAMED_LWDCLIENT_H 1
/*! \file */
#include <isc/event.h>
#include <isc/eventclass.h>
#include <isc/netaddr.h>
#include <isc/sockaddr.h>
#include <isc/types.h>
#include <dns/fixedname.h>
#include <dns/types.h>
#include <lwres/lwres.h>
#include <named/lwsearch.h>
#define LWRD_EVENTCLASS ISC_EVENTCLASS(4242)
#define LWRD_SHUTDOWN (LWRD_EVENTCLASS + 0x0001)
/*% Lighweight Resolver Daemon Client */
struct ns_lwdclient {
isc_sockaddr_t address; /*%< where to reply */
struct in6_pktinfo pktinfo;
isc_boolean_t pktinfo_valid;
ns_lwdclientmgr_t *clientmgr; /*%< our parent */
ISC_LINK(ns_lwdclient_t) link;
unsigned int state;
void *arg; /*%< packet processing state */
/*
* Received data info.
*/
unsigned char buffer[LWRES_RECVLENGTH]; /*%< receive buffer */
isc_uint32_t recvlength; /*%< length recv'd */
lwres_lwpacket_t pkt;
/*%
* Send data state. If sendbuf != buffer (that is, the send buffer
* isn't our receive buffer) it will be freed to the lwres_context_t.
*/
unsigned char *sendbuf;
isc_uint32_t sendlength;
isc_buffer_t recv_buffer;
/*%
* gabn (get address by name) state info.
*/
dns_adbfind_t *find;
dns_adbfind_t *v4find;
dns_adbfind_t *v6find;
unsigned int find_wanted; /*%< Addresses we want */
dns_fixedname_t query_name;
dns_fixedname_t target_name;
ns_lwsearchctx_t searchctx;
lwres_gabnresponse_t gabn;
/*%
* gnba (get name by address) state info.
*/
lwres_gnbaresponse_t gnba;
dns_byaddr_t *byaddr;
unsigned int options;
isc_netaddr_t na;
/*%
* grbn (get rrset by name) state info.
*
* Note: this also uses target_name and searchctx.
*/
lwres_grbnresponse_t grbn;
dns_lookup_t *lookup;
dns_rdatatype_t rdtype;
/*%
* Alias and address info. This is copied up to the gabn/gnba
* structures eventually.
*
* XXXMLG We can keep all of this in a client since we only service
* three packet types right now. If we started handling more,
* we'd need to use "arg" above and allocate/destroy things.
*/
char *aliases[LWRES_MAX_ALIASES];
isc_uint16_t aliaslen[LWRES_MAX_ALIASES];
lwres_addr_t addrs[LWRES_MAX_ADDRS];
};
/*%
* Client states.
*
* _IDLE The client is not doing anything at all.
*
* _RECV The client is waiting for data after issuing a socket recv().
*
* _RECVDONE Data has been received, and is being processed.
*
* _FINDWAIT An adb (or other) request was made that cannot be satisfied
* immediately. An event will wake the client up.
*
* _SEND All data for a response has completed, and a reply was
* sent via a socket send() call.
*
* Badly formatted state table:
*
* IDLE -> RECV when client has a recv() queued.
*
* RECV -> RECVDONE when recvdone event received.
*
* RECVDONE -> SEND if the data for a reply is at hand.
* RECVDONE -> FINDWAIT if more searching is needed, and events will
* eventually wake us up again.
*
* FINDWAIT -> SEND when enough data was received to reply.
*
* SEND -> IDLE when a senddone event was received.
*
* At any time -> IDLE on error. Sometimes this will be -> SEND
* instead, if enough data is on hand to reply with a meaningful
* error.
*
* Packets which are badly formatted may or may not get error returns.
*/
#define NS_LWDCLIENT_STATEIDLE 1
#define NS_LWDCLIENT_STATERECV 2
#define NS_LWDCLIENT_STATERECVDONE 3
#define NS_LWDCLIENT_STATEFINDWAIT 4
#define NS_LWDCLIENT_STATESEND 5
#define NS_LWDCLIENT_STATESENDDONE 6
#define NS_LWDCLIENT_ISIDLE(c) \
((c)->state == NS_LWDCLIENT_STATEIDLE)
#define NS_LWDCLIENT_ISRECV(c) \
((c)->state == NS_LWDCLIENT_STATERECV)
#define NS_LWDCLIENT_ISRECVDONE(c) \
((c)->state == NS_LWDCLIENT_STATERECVDONE)
#define NS_LWDCLIENT_ISFINDWAIT(c) \
((c)->state == NS_LWDCLIENT_STATEFINDWAIT)
#define NS_LWDCLIENT_ISSEND(c) \
((c)->state == NS_LWDCLIENT_STATESEND)
/*%
* Overall magic test that means we're not idle.
*/
#define NS_LWDCLIENT_ISRUNNING(c) (!NS_LWDCLIENT_ISIDLE(c))
#define NS_LWDCLIENT_SETIDLE(c) \
((c)->state = NS_LWDCLIENT_STATEIDLE)
#define NS_LWDCLIENT_SETRECV(c) \
((c)->state = NS_LWDCLIENT_STATERECV)
#define NS_LWDCLIENT_SETRECVDONE(c) \
((c)->state = NS_LWDCLIENT_STATERECVDONE)
#define NS_LWDCLIENT_SETFINDWAIT(c) \
((c)->state = NS_LWDCLIENT_STATEFINDWAIT)
#define NS_LWDCLIENT_SETSEND(c) \
((c)->state = NS_LWDCLIENT_STATESEND)
#define NS_LWDCLIENT_SETSENDDONE(c) \
((c)->state = NS_LWDCLIENT_STATESENDDONE)
/*% lightweight daemon client manager */
struct ns_lwdclientmgr {
ns_lwreslistener_t *listener;
isc_mem_t *mctx;
isc_socket_t *sock; /*%< socket to use */
dns_view_t *view;
lwres_context_t *lwctx; /*%< lightweight proto context */
isc_task_t *task; /*%< owning task */
unsigned int flags;
ISC_LINK(ns_lwdclientmgr_t) link;
ISC_LIST(ns_lwdclient_t) idle; /*%< idle client slots */
ISC_LIST(ns_lwdclient_t) running; /*%< running clients */
};
#define NS_LWDCLIENTMGR_FLAGRECVPENDING 0x00000001
#define NS_LWDCLIENTMGR_FLAGSHUTTINGDOWN 0x00000002
isc_result_t
ns_lwdclientmgr_create(ns_lwreslistener_t *, unsigned int, isc_taskmgr_t *);
void
ns_lwdclient_initialize(ns_lwdclient_t *, ns_lwdclientmgr_t *);
isc_result_t
ns_lwdclient_startrecv(ns_lwdclientmgr_t *);
void
ns_lwdclient_stateidle(ns_lwdclient_t *);
void
ns_lwdclient_recv(isc_task_t *, isc_event_t *);
void
ns_lwdclient_shutdown(isc_task_t *, isc_event_t *);
void
ns_lwdclient_send(isc_task_t *, isc_event_t *);
isc_result_t
ns_lwdclient_sendreply(ns_lwdclient_t *client, isc_region_t *r);
/*
* Processing functions of various types.
*/
void ns_lwdclient_processgabn(ns_lwdclient_t *, lwres_buffer_t *);
void ns_lwdclient_processgnba(ns_lwdclient_t *, lwres_buffer_t *);
void ns_lwdclient_processgrbn(ns_lwdclient_t *, lwres_buffer_t *);
void ns_lwdclient_processnoop(ns_lwdclient_t *, lwres_buffer_t *);
void ns_lwdclient_errorpktsend(ns_lwdclient_t *, isc_uint32_t);
void ns_lwdclient_log(int level, const char *format, ...)
ISC_FORMAT_PRINTF(2, 3);
#endif /* NAMED_LWDCLIENT_H */
|
