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
|
/*
* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and 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.
*/
/* $ISC: tcpmsg.h,v 1.15.206.1 2004/03/06 08:14:00 marka Exp $ */
#ifndef DNS_TCPMSG_H
#define DNS_TCPMSG_H 1
#include <isc/buffer.h>
#include <isc/lang.h>
#include <isc/socket.h>
typedef struct dns_tcpmsg {
/* private (don't touch!) */
unsigned int magic;
isc_uint16_t size;
isc_buffer_t buffer;
unsigned int maxsize;
isc_mem_t *mctx;
isc_socket_t *sock;
isc_task_t *task;
isc_taskaction_t action;
void *arg;
isc_event_t event;
/* public (read-only) */
isc_result_t result;
isc_sockaddr_t address;
} dns_tcpmsg_t;
ISC_LANG_BEGINDECLS
void
dns_tcpmsg_init(isc_mem_t *mctx, isc_socket_t *sock, dns_tcpmsg_t *tcpmsg);
/*
* Associate a tcp message state with a given memory context and
* TCP socket.
*
* Requires:
*
* "mctx" and "sock" be non-NULL and valid types.
*
* "sock" be a read/write TCP socket.
*
* "tcpmsg" be non-NULL and an uninitialized or invalidated structure.
*
* Ensures:
*
* "tcpmsg" is a valid structure.
*/
void
dns_tcpmsg_setmaxsize(dns_tcpmsg_t *tcpmsg, unsigned int maxsize);
/*
* Set the maximum packet size to "maxsize"
*
* Requires:
*
* "tcpmsg" be valid.
*
* 512 <= "maxsize" <= 65536
*/
isc_result_t
dns_tcpmsg_readmessage(dns_tcpmsg_t *tcpmsg,
isc_task_t *task, isc_taskaction_t action, void *arg);
/*
* Schedule an event to be delivered when a DNS message is readable, or
* when an error occurs on the socket.
*
* Requires:
*
* "tcpmsg" be valid.
*
* "task", "taskaction", and "arg" be valid.
*
* Returns:
*
* ISC_R_SUCCESS -- no error
* Anything that the isc_socket_recv() call can return. XXXMLG
*
* Notes:
*
* The event delivered is a fully generic event. It will contain no
* actual data. The sender will be a pointer to the dns_tcpmsg_t.
* The result code inside that structure should be checked to see
* what the final result was.
*/
void
dns_tcpmsg_cancelread(dns_tcpmsg_t *tcpmsg);
/*
* Cancel a readmessage() call. The event will still be posted with a
* CANCELED result code.
*
* Requires:
*
* "tcpmsg" be valid.
*/
void
dns_tcpmsg_keepbuffer(dns_tcpmsg_t *tcpmsg, isc_buffer_t *buffer);
/*
* If a dns buffer is to be kept between calls, this function marks the
* internal state-machine buffer as invalid, and copies all the contents
* of the state into "buffer".
*
* Requires:
*
* "tcpmsg" be valid.
*
* "buffer" be non-NULL.
*/
void
dns_tcpmsg_invalidate(dns_tcpmsg_t *tcpmsg);
/*
* Clean up all allocated state, and invalidate the structure.
*
* Requires:
*
* "tcpmsg" be valid.
*
* Ensures:
*
* "tcpmsg" is invalidated and disassociated with all memory contexts,
* sockets, etc.
*/
ISC_LANG_ENDDECLS
#endif /* DNS_TCPMSG_H */
|
