forked from CESNET/libyang
-
Notifications
You must be signed in to change notification settings - Fork 0
/
ip_prefix.c
300 lines (257 loc) · 8.38 KB
/
ip_prefix.c
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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
/**
* @file ip_prefix.c
* @author Michal Vasko <mvasko@cesnet.cz>
* @brief ietf-inet-types ip-prefix type plugin.
*
* Copyright (c) 2019-2021 CESNET, z.s.p.o.
*
* This source code is licensed under BSD 3-Clause License (the "License").
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*/
#define _GNU_SOURCE
#include "plugins_types.h"
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "libyang.h"
#include "common.h"
#include "compat.h"
/**
* @brief Canonize an ipv4-prefix value.
*
* @param[in] ipv4_prefix Prefix to canonize.
* @param[out] canonical Canonical format of @p ipv4_prefix.
* @param[out] err Error structure on error.
* @return LY_ERR value.
*/
static LY_ERR
canonize_ipv4_prefix(const char *ipv4_prefix, char **canonical, struct ly_err_item **err)
{
LY_ERR ret;
const char *pref_str;
char *ptr, *result = NULL;
uint32_t pref, addr_bin, i, mask;
*canonical = NULL;
*err = NULL;
pref_str = strchr(ipv4_prefix, '/');
if (!pref_str) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Invalid IPv4 prefix \"%s\".", ipv4_prefix);
goto error;
}
/* learn prefix */
pref = strtoul(pref_str + 1, &ptr, 10);
if (ptr[0] || (pref > 32)) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Invalid IPv4 prefix \"%s\".", ipv4_prefix);
goto error;
}
result = malloc(INET_ADDRSTRLEN + 3);
if (!result) {
ret = LY_EMEM;
goto error;
}
/* copy just the network prefix */
strncpy(result, ipv4_prefix, pref_str - ipv4_prefix);
result[pref_str - ipv4_prefix] = '\0';
/* convert it to binary form */
if (inet_pton(AF_INET, result, (void *)&addr_bin) != 1) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Failed to convert IPv4 address \"%s\".", result);
goto error;
}
/* zero host bits */
mask = 0;
for (i = 0; i < 32; ++i) {
mask <<= 1;
if (pref > i) {
mask |= 1;
}
}
mask = htonl(mask);
addr_bin &= mask;
/* convert back to string */
if (!inet_ntop(AF_INET, (void *)&addr_bin, result, INET_ADDRSTRLEN)) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Failed to convert IPv4 address (%s).", strerror(errno));
goto error;
}
/* add the prefix */
strcat(result, pref_str);
*canonical = result;
return LY_SUCCESS;
error:
free(result);
return ret;
}
/**
* @brief Canonize an ipv6-prefix value.
*
* @param[in] ipv6_prefix Prefix to canonize.
* @param[out] canonical Canonical format of @p ipv6_prefix.
* @param[out] err Error structure on error.
* @return LY_ERR value.
*/
static LY_ERR
canonize_ipv6_prefix(const char *ipv4_prefix, char **canonical, struct ly_err_item **err)
{
LY_ERR ret;
const char *pref_str;
char *ptr, *result = NULL;
unsigned long int pref, i, j;
union {
struct in6_addr s;
uint32_t a[4];
} addr_bin;
uint32_t mask;
*canonical = NULL;
*err = NULL;
pref_str = strchr(ipv4_prefix, '/');
if (!pref_str) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Invalid IPv6 prefix \"%s\".", ipv4_prefix);
goto error;
}
/* learn prefix */
pref = strtoul(pref_str + 1, &ptr, 10);
if (ptr[0] || (pref > 128)) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Invalid IPv6 prefix \"%s\".", ipv4_prefix);
goto error;
}
result = malloc(INET6_ADDRSTRLEN + 4);
if (!result) {
ret = LY_EMEM;
goto error;
}
/* copy just the network prefix */
strncpy(result, ipv4_prefix, pref_str - ipv4_prefix);
result[pref_str - ipv4_prefix] = '\0';
/* convert it to binary form */
if (inet_pton(AF_INET6, result, (void *)&addr_bin.s) != 1) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Failed to convert IPv6 address \"%s\".", result);
goto error;
}
/* zero host bits */
for (i = 0; i < 4; ++i) {
mask = 0;
for (j = 0; j < 32; ++j) {
mask <<= 1;
if (pref > (i * 32) + j) {
mask |= 1;
}
}
mask = htonl(mask);
addr_bin.a[i] &= mask;
}
/* convert back to string */
if (!inet_ntop(AF_INET6, (void *)&addr_bin.s, result, INET6_ADDRSTRLEN)) {
ret = ly_err_new(err, LY_EVALID, LYVE_DATA, NULL, NULL, "Failed to convert IPv6 address (%s).", strerror(errno));
goto error;
}
/* add the prefix */
strcat(result, pref_str);
*canonical = result;
return LY_SUCCESS;
error:
free(result);
return ret;
}
/**
* @brief Validate, canonize and store value of the ietf-inet-types ipv4-prefix type.
* Implementation of the ::lyplg_type_store_clb.
*/
static LY_ERR
lyplg_type_store_ipv4_prefix(const struct ly_ctx *ctx, const struct lysc_type *type, const char *value, size_t value_len,
uint32_t options, LY_VALUE_FORMAT format, void *prefix_data, uint32_t hints, const struct lysc_node *ctx_node,
struct lyd_value *storage, struct lys_glob_unres *unres, struct ly_err_item **err)
{
LY_ERR ret = LY_SUCCESS;
char *canonical;
/* store as a string */
ret = lyplg_type_store_string(ctx, type, value, value_len, options, format, prefix_data, hints, ctx_node,
storage, unres, err);
LY_CHECK_RET(ret);
/* canonize */
ret = canonize_ipv4_prefix(storage->canonical, &canonical, err);
LY_CHECK_GOTO(ret, cleanup);
if (strcmp(canonical, storage->canonical)) {
/* some conversion took place, update the value */
lydict_remove(ctx, storage->canonical);
storage->canonical = NULL;
LY_CHECK_GOTO(ret = lydict_insert_zc(ctx, canonical, &storage->canonical), cleanup);
} else {
free(canonical);
}
cleanup:
if (ret) {
type->plugin->free(ctx, storage);
}
return ret;
}
/**
* @brief Validate, canonize and store value of the ietf-inet-types ipv6-prefix type.
* Implementation of the ::lyplg_type_store_clb.
*/
static LY_ERR
lyplg_type_store_ipv6_prefix(const struct ly_ctx *ctx, const struct lysc_type *type, const char *value, size_t value_len,
uint32_t options, LY_VALUE_FORMAT format, void *prefix_data, uint32_t hints, const struct lysc_node *ctx_node,
struct lyd_value *storage, struct lys_glob_unres *unres, struct ly_err_item **err)
{
LY_ERR ret = LY_SUCCESS;
char *canonical;
/* store as a string */
ret = lyplg_type_store_string(ctx, type, value, value_len, options, format, prefix_data, hints, ctx_node,
storage, unres, err);
LY_CHECK_RET(ret);
/* canonize */
ret = canonize_ipv6_prefix(storage->canonical, &canonical, err);
LY_CHECK_GOTO(ret, cleanup);
if (strcmp(canonical, storage->canonical)) {
/* some conversion took place, update the value */
lydict_remove(ctx, storage->canonical);
storage->canonical = NULL;
LY_CHECK_GOTO(ret = lydict_insert_zc(ctx, canonical, &storage->canonical), cleanup);
} else {
free(canonical);
}
cleanup:
if (ret) {
type->plugin->free(ctx, storage);
}
return ret;
}
/**
* @brief Plugin information for ip-prefix type implementation.
*
* Note that external plugins are supposed to use:
*
* LYPLG_TYPES = {
*/
const struct lyplg_type_record plugins_ip_prefix[] = {
{
.module = "ietf-inet-types",
.revision = "2013-07-15",
.name = "ipv4-prefix",
.plugin.id = "libyang 2 - ipv4-prefix, version 1",
.plugin.store = lyplg_type_store_ipv4_prefix,
.plugin.validate = NULL,
.plugin.compare = lyplg_type_compare_simple,
.plugin.print = lyplg_type_print_simple,
.plugin.duplicate = lyplg_type_dup_simple,
.plugin.free = lyplg_type_free_simple
},
{
.module = "ietf-inet-types",
.revision = "2013-07-15",
.name = "ipv6-prefix",
.plugin.id = "libyang 2 - ipv6-prefix, version 1",
.plugin.store = lyplg_type_store_ipv6_prefix,
.plugin.validate = NULL,
.plugin.compare = lyplg_type_compare_simple,
.plugin.print = lyplg_type_print_simple,
.plugin.duplicate = lyplg_type_dup_simple,
.plugin.free = lyplg_type_free_simple
},
{0}
};