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
235
236
|
/* $OpenBSD: field.c,v 1.20 2015/06/03 02:24:36 millert Exp $ */
/* $EOM: field.c,v 1.11 2000/02/20 19:58:37 niklas Exp $ */
/*
* Copyright (c) 1998, 1999 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "constants.h"
#include "field.h"
#include "log.h"
#include "util.h"
static char *field_debug_raw(u_int8_t *, size_t, struct constant_map **);
static char *field_debug_num(u_int8_t *, size_t, struct constant_map **);
static char *field_debug_mask(u_int8_t *, size_t, struct constant_map **);
static char *field_debug_ign(u_int8_t *, size_t, struct constant_map **);
static char *field_debug_cst(u_int8_t *, size_t, struct constant_map **);
/* Contents must match the enum in struct field. */
static char *(*decode_field[]) (u_int8_t *, size_t,
struct constant_map **) = {
field_debug_raw,
field_debug_num,
field_debug_mask,
field_debug_ign,
field_debug_cst
};
/*
* Return a string showing the hexadecimal contents of the LEN-sized buffer
* BUF. MAPS should be zero and is only here because the API requires it.
*/
static char *
field_debug_raw(u_int8_t *buf, size_t len, struct constant_map **maps)
{
return raw2hex(buf, len);
}
/*
* Convert the unsigned LEN-sized number at BUF of network byteorder to a
* 32-bit unsigned integer of host byteorder pointed to by VAL.
*/
static int
extract_val(u_int8_t *buf, size_t len, u_int32_t *val)
{
switch (len) {
case 1:
*val = *buf;
break;
case 2:
*val = decode_16(buf);
break;
case 4:
*val = decode_32(buf);
break;
default:
return -1;
}
return 0;
}
/*
* Return a textual representation of the unsigned number pointed to by BUF
* which is LEN octets long. MAPS should be zero and is only here because
* the API requires it.
*/
static char *
field_debug_num(u_int8_t *buf, size_t len, struct constant_map **maps)
{
char *retval = NULL;
u_int32_t val;
if (extract_val(buf, len, &val))
return 0;
/* 3 decimal digits are enough to represent each byte. */
(void)asprintf(&retval, "%u", val);
return retval;
}
/*
* Return the symbolic names of the flags pointed to by BUF which is LEN
* octets long, using the constant maps MAPS.
*/
static char *
field_debug_mask(u_int8_t *buf, size_t len, struct constant_map **maps)
{
u_int32_t val;
u_int32_t bit;
char *retval, *new_buf, *name;
size_t buf_sz;
if (extract_val(buf, len, &val))
return 0;
/* Size for brackets, two spaces and a NUL terminator. */
buf_sz = 4;
retval = malloc(buf_sz);
if (!retval)
return 0;
strlcpy(retval, "[ ", buf_sz);
for (bit = 1; bit; bit <<= 1) {
if (val & bit) {
name = constant_name_maps(maps, bit);
buf_sz += strlen(name) + 1;
new_buf = realloc(retval, buf_sz);
if (!new_buf) {
free(retval);
return 0;
}
retval = new_buf;
strlcat(retval, name, buf_sz);
strlcat(retval, " ", buf_sz);
}
}
strlcat(retval, "]", buf_sz);
return retval;
}
/*
* Just a dummy needed to skip the unused LEN sized space at BUF. MAPS
* should be zero and is only here because the API requires it.
*/
static char *
field_debug_ign(u_int8_t *buf, size_t len, struct constant_map **maps)
{
return 0;
}
/*
* Return the symbolic name of a constant pointed to by BUF which is LEN
* octets long, using the constant maps MAPS.
*/
static char *
field_debug_cst(u_int8_t *buf, size_t len, struct constant_map **maps)
{
u_int32_t val;
if (extract_val(buf, len, &val))
return 0;
return strdup(constant_name_maps(maps, val));
}
/* Pretty-print a field from BUF as described by F. */
void
field_dump_field(struct field *f, u_int8_t *buf)
{
char *value;
value = decode_field[(int) f->type] (buf + f->offset, f->len, f->maps);
if (value) {
LOG_DBG((LOG_MESSAGE, 70, "%s: %s", f->name, value));
free(value);
}
}
/* Pretty-print all the fields of BUF as described in FIELDS. */
void
field_dump_payload(struct field *fields, u_int8_t *buf)
{
struct field *field;
for (field = fields; field->name; field++)
field_dump_field(field, buf);
}
/* Return the numeric value of the field F of BUF. */
u_int32_t
field_get_num(struct field *f, u_int8_t *buf)
{
u_int32_t val;
if (extract_val(buf + f->offset, f->len, &val))
return 0;
return val;
}
/* Stash the number VAL into BUF's field F. */
void
field_set_num(struct field *f, u_int8_t *buf, u_int32_t val)
{
switch (f->len) {
case 1:
buf[f->offset] = val;
break;
case 2:
encode_16(buf + f->offset, val);
break;
case 4:
encode_32(buf + f->offset, val);
break;
}
}
/* Stash BUF's raw field F into VAL. */
void
field_get_raw(struct field *f, u_int8_t *buf, u_int8_t *val)
{
memcpy(val, buf + f->offset, f->len);
}
/* Stash the buffer VAL into BUF's field F. */
void
field_set_raw(struct field *f, u_int8_t *buf, u_int8_t *val)
{
memcpy(buf + f->offset, val, f->len);
}
|
