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
|
/*
* (C) 2021-2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved.
*
* Author: Neels Janosch Hofmeyr <nhofmeyr@sysmocom.de>
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <errno.h>
#include <osmocom/core/application.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gtlv/gtlv.h>
#include <myproto_ies_auto.h>
struct myproto_msg {
enum myproto_msg_type type;
union myproto_ies ies;
};
static void err_cb(void *data, void *decoded_struct, const char *file, int line, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
//printf("ERR: %s:%d ", file, line);
printf("ERR: ");
vprintf(fmt, args);
va_end(args);
}
static int myproto_msg_enc(struct msgb *dst, const struct myproto_msg *msg, const struct osmo_gtlv_cfg *cfg)
{
struct osmo_gtlv_put gtlv = {
.cfg = cfg,
.dst = dst,
};
msgb_put_u8(gtlv.dst, msg->type);
return myproto_ies_encode(>lv, (void *)&msg->ies, msg->type, err_cb, NULL, myproto_iei_names);
}
static int myproto_msg_dec(struct myproto_msg *msg, const uint8_t *data, size_t data_len,
const struct osmo_gtlv_cfg *cfg, bool ordered)
{
struct osmo_gtlv_load gtlv;
if (data_len < 1)
return -EINVAL;
msg->type = data[0];
gtlv = (struct osmo_gtlv_load){
.cfg = cfg,
.src = { data + 1, data_len - 1 },
};
return myproto_ies_decode(&msg->ies, >lv, ordered, msg->type, err_cb, NULL, myproto_iei_names);
}
void *ctx;
struct myproto_msg tests[] = {
{
MYPROTO_MSGT_MOO,
{
.moo = {
.bar_alpha = { 23, true },
.bar_gamma = { 42, false },
},
},
},
{
MYPROTO_MSGT_MOO,
{
.moo = {
.bar_alpha = { 11, true },
.bar_beta_present = true,
.bar_beta = { 22, false },
.bar_gamma = { 33, true },
},
},
},
};
int myproto_msg_to_str_buf(char *buf, size_t buflen, const struct myproto_msg *m)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
OSMO_STRBUF_PRINTF(sb, "%s={", get_value_string(myproto_msg_type_names, m->type));
OSMO_STRBUF_APPEND(sb, osmo_gtlvs_encode_to_str_buf, &m->ies, sizeof(m->ies), 0,
myproto_get_msg_coding(m->type), myproto_iei_names);
OSMO_STRBUF_PRINTF(sb, " }");
return sb.chars_needed;
}
char *myproto_msg_to_str(const struct myproto_msg *m)
{
OSMO_NAME_C_IMPL(ctx, 256, "ERROR", myproto_msg_to_str_buf, m)
}
void test_enc_dec(const char *label, const struct osmo_gtlv_cfg *cfg, bool ordered)
{
int i;
for (i = 0; i < ARRAY_SIZE(tests); i++) {
int rc;
const struct myproto_msg *orig = &tests[i];
struct myproto_msg parsed = {};
struct msgb *msg;
printf("\n=== start %s %s[%d]\n", label, __func__, i);
printf("encoded: %s\n", myproto_msg_to_str(orig));
msg = msgb_alloc(1024, __func__);
rc = myproto_msg_enc(msg, orig, cfg);
printf("myproto_msg_enc() rc = %d\n", rc);
printf("%s.\n", osmo_hexdump(msg->data, msg->len));
rc = myproto_msg_dec(&parsed, msg->data, msg->len, cfg, ordered);
printf("myproto_msg_dec() rc = %d\n", rc);
printf("decoded: %s\n", myproto_msg_to_str(&parsed));
if (strcmp(myproto_msg_to_str(orig), myproto_msg_to_str(&parsed))) {
printf(" ERROR: parsed != orig\n");
exit(1);
}
msgb_free(msg);
printf("=== end %s %s[%d]\n", label, __func__, i);
}
}
/* Example of defining a TLI, with an instance indicator */
static int tliv_load_tl(struct osmo_gtlv_load *gtlv, const uint8_t *src_data, size_t src_data_len)
{
/* already validated in next_tl_valid(): src_data_len >= cfg->tl_min_size == 2. */
gtlv->ti.tag = src_data[0];
gtlv->len = src_data[1];
switch (gtlv->ti.tag) {
/* All tags that are TLIV go here */
case MYPROTO_IEI_BAR:
if (src_data_len < 3)
return -ENOSPC;
gtlv->ti.instance_present = true;
gtlv->ti.instance = src_data[2];
gtlv->val = src_data + 3;
/* In this example, the I is part of the len */
gtlv->len--;
return 0;
default:
gtlv->val = src_data + 2;
return 0;
}
}
static int tliv_store_tl(uint8_t *dst_data, size_t dst_data_avail, const struct osmo_gtlv_tag_inst *ti, size_t len,
struct osmo_gtlv_put *gtlv)
{
if (ti->tag > UINT8_MAX)
return -EINVAL;
if (len > UINT8_MAX)
return -EMSGSIZE;
if (dst_data_avail < 2)
return -ENOSPC;
dst_data[0] = ti->tag;
switch (ti->tag) {
/* All tags that are TLIV go here */
case MYPROTO_IEI_BAR:
if (dst_data_avail < 3)
return -ENOSPC;
if (!ti->instance_present)
return -EINVAL;
if (ti->instance > UINT8_MAX)
return -EINVAL;
/* here, I is part of the len in L; the passed len reflects only the value, so add 1 for I */
dst_data[1] = len + 1;
dst_data[2] = ti->instance;
return 3;
default:
dst_data[1] = len;
return 2;
}
}
const struct osmo_gtlv_cfg osmo_tliv_cfg = {
.tl_min_size = 2,
.load_tl = tliv_load_tl,
.store_tl = tliv_store_tl,
};
int main(int argc, char **argv)
{
ctx = talloc_named_const(NULL, 0, "test_gen_tlv");
msgb_talloc_ctx_init(ctx, 0);
test_enc_dec("tliv ordered", &osmo_tliv_cfg, true);
test_enc_dec("tliv unordered", &osmo_tliv_cfg, false);
talloc_free(ctx);
return 0;
}
|
