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8079a413 PG |
1 | /* |
2 | * ASN functions | |
3 | * | |
4 | * Copyright 2022 6WIND | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms of the GNU General Public License as published by the Free | |
8 | * Software Foundation; either version 2 of the License, or (at your option) | |
9 | * any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | * more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; see the file COPYING; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | #include <zebra.h> | |
21 | #include "log.h" | |
22 | #include "asn.h" | |
23 | ||
24 | static bool relax_as_zero; | |
25 | ||
e55b0883 PG |
26 | static const struct message asnotation_mode_msg[] = { |
27 | {ASNOTATION_PLAIN, "plain"}, | |
28 | {ASNOTATION_DOT, "dot"}, | |
29 | {ASNOTATION_DOTPLUS, "dot+"}, | |
30 | {ASNOTATION_UNDEFINED, "undefined"}, | |
31 | {0} | |
32 | }; | |
33 | ||
8079a413 PG |
34 | /* converts a string into an Autonomous system number |
35 | * "1.1" => 65536 | |
36 | * "65500" => 65500 | |
37 | */ | |
38 | static bool asn_str2asn_internal(const char *asstring, as_t *asn, | |
e55b0883 PG |
39 | const char **next, bool *partial, |
40 | enum asnotation_mode *mode) | |
8079a413 PG |
41 | { |
42 | uint32_t high = 0, low = 0; | |
43 | uint64_t temp_val; | |
44 | const char *p = asstring; | |
45 | bool ret = false; | |
46 | uint32_t digit; | |
e55b0883 | 47 | enum asnotation_mode val = ASNOTATION_PLAIN; |
8079a413 PG |
48 | |
49 | if (!asstring) | |
50 | goto end; | |
51 | ||
52 | if (!isdigit((unsigned char)*p)) | |
53 | goto end; | |
54 | ||
b7d890dd | 55 | /* leading zero is forbidden */ |
56 | if (*p == '0' && isdigit((unsigned char)*(p + 1))) | |
57 | goto end; | |
58 | ||
8079a413 PG |
59 | temp_val = 0; |
60 | while (isdigit((unsigned char)*p)) { | |
61 | digit = (*p) - '0'; | |
62 | temp_val *= 10; | |
63 | temp_val += digit; | |
64 | if (temp_val > UINT32_MAX) | |
65 | /* overflow */ | |
66 | goto end; | |
67 | p++; | |
68 | } | |
69 | high = (uint32_t)temp_val; | |
70 | if (*p == '.') { /* dot format */ | |
71 | p++; | |
b7d890dd | 72 | |
8079a413 PG |
73 | if (*p == '\0' && partial) { |
74 | *partial = true; | |
75 | goto end; | |
76 | } | |
b7d890dd | 77 | |
78 | /* leading zero is forbidden */ | |
79 | if (*p == '0' && isdigit((unsigned char)*(p + 1))) | |
80 | goto end; | |
81 | ||
82 | temp_val = 0; | |
8079a413 PG |
83 | while (isdigit((unsigned char)*p)) { |
84 | digit = (*p) - '0'; | |
85 | temp_val *= 10; | |
86 | temp_val += digit; | |
87 | if (temp_val > UINT16_MAX) | |
88 | /* overflow */ | |
89 | goto end; | |
90 | p++; | |
91 | } | |
92 | low = (uint32_t)temp_val; | |
93 | ||
94 | if (!next && *p != '\0' && !isdigit((unsigned char)*p)) | |
95 | goto end; | |
96 | /* AS <AS4B>.<AS4B> is forbidden */ | |
97 | if (high > UINT16_MAX) | |
98 | goto end; | |
99 | /* AS 0.0 is authorised for some case only */ | |
100 | if (!relax_as_zero && high == 0 && low == 0) { | |
101 | if (partial) | |
102 | *partial = true; | |
103 | goto end; | |
104 | } | |
e55b0883 PG |
105 | if (asn) |
106 | *asn = (high << 16) + low; | |
8079a413 | 107 | ret = true; |
e55b0883 PG |
108 | if (high == 0) |
109 | val = ASNOTATION_DOTPLUS; | |
110 | else | |
111 | val = ASNOTATION_DOT; | |
8079a413 PG |
112 | goto end; |
113 | } | |
114 | /* AS 0 is forbidden */ | |
115 | if (!relax_as_zero && high == 0) | |
116 | goto end; | |
117 | if (!asn) { | |
118 | ret = true; | |
119 | goto end; | |
120 | } | |
121 | *asn = high; | |
122 | ret = true; | |
123 | end: | |
124 | if (next) | |
125 | *next = p; | |
e55b0883 PG |
126 | if (mode) |
127 | *mode = val; | |
8079a413 PG |
128 | return ret; |
129 | } | |
130 | ||
17571c4a PG |
131 | static void asn_asn2asdot(as_t asn, char *asstring, size_t len) |
132 | { | |
133 | uint16_t low, high; | |
134 | ||
135 | high = (asn >> 16) & 0xffff; | |
136 | low = asn & 0xffff; | |
137 | snprintf(asstring, len, "%hu.%hu", high, low); | |
138 | } | |
139 | ||
8079a413 PG |
140 | bool asn_str2asn(const char *asstring, as_t *asn) |
141 | { | |
e55b0883 | 142 | return asn_str2asn_internal(asstring, asn, NULL, NULL, NULL); |
8079a413 PG |
143 | } |
144 | ||
145 | const char *asn_asn2asplain(as_t asn) | |
146 | { | |
147 | static char buf[ASN_STRING_MAX_SIZE]; | |
148 | ||
149 | snprintf(buf, sizeof(buf), "%u", asn); | |
150 | return buf; | |
151 | } | |
152 | ||
153 | const char *asn_str2asn_parse(const char *asstring, as_t *asn, bool *found_ptr) | |
154 | { | |
155 | const char *p = NULL; | |
156 | const char **next = &p; | |
157 | bool found; | |
158 | ||
e55b0883 | 159 | found = asn_str2asn_internal(asstring, asn, next, NULL, NULL); |
8079a413 PG |
160 | if (found_ptr) |
161 | *found_ptr = found; | |
162 | return *next; | |
163 | } | |
164 | ||
165 | void asn_relax_as_zero(bool relax) | |
166 | { | |
167 | relax_as_zero = relax; | |
168 | } | |
169 | ||
170 | enum match_type asn_str2asn_match(const char *str) | |
171 | { | |
172 | bool found, partial = false; | |
173 | ||
e55b0883 | 174 | found = asn_str2asn_internal(str, NULL, NULL, &partial, NULL); |
8079a413 PG |
175 | if (found && !partial) |
176 | return exact_match; | |
177 | ||
178 | if (partial) | |
179 | return partly_match; | |
180 | ||
181 | return no_match; | |
182 | } | |
e55b0883 PG |
183 | |
184 | bool asn_str2asn_notation(const char *asstring, as_t *asn, | |
185 | enum asnotation_mode *asnotation) | |
186 | { | |
187 | return asn_str2asn_internal(asstring, asn, NULL, NULL, asnotation); | |
188 | } | |
189 | ||
190 | const char *asn_mode2str(enum asnotation_mode asnotation) | |
191 | { | |
192 | return lookup_msg(asnotation_mode_msg, asnotation, | |
193 | "Unrecognized AS notation mode"); | |
194 | } | |
17571c4a | 195 | |
e84c7c12 PG |
196 | void asn_asn2json(json_object *json, const char *attr, |
197 | as_t asn, enum asnotation_mode asnotation) | |
198 | { | |
199 | static char as_str[ASN_STRING_MAX_SIZE]; | |
200 | ||
201 | if ((asnotation == ASNOTATION_PLAIN) || | |
202 | ((asnotation == ASNOTATION_DOT) && asn < UINT16_MAX)) | |
203 | json_object_int_add(json, attr, asn); | |
204 | else { | |
205 | asn_asn2asdot(asn, as_str, sizeof(as_str)); | |
206 | json_object_string_add(json, attr, as_str); | |
207 | } | |
208 | } | |
209 | ||
17571c4a PG |
210 | void asn_asn2json_array(json_object *jseg_list, as_t asn, |
211 | enum asnotation_mode asnotation) | |
212 | { | |
213 | static char as_str[ASN_STRING_MAX_SIZE]; | |
214 | ||
215 | if ((asnotation == ASNOTATION_PLAIN) || | |
216 | ((asnotation == ASNOTATION_DOT) && asn < UINT16_MAX)) | |
217 | json_object_array_add(jseg_list, | |
218 | json_object_new_int64(asn)); | |
219 | else { | |
220 | asn_asn2asdot(asn, as_str, sizeof(as_str)); | |
221 | json_array_string_add(jseg_list, as_str); | |
222 | } | |
223 | } | |
224 | ||
4a8cd6ad PG |
225 | char *asn_asn2string(const as_t *asn, char *buf, size_t len, |
226 | enum asnotation_mode asnotation) | |
227 | { | |
228 | if ((asnotation == ASNOTATION_PLAIN) || | |
229 | ((asnotation == ASNOTATION_DOT) && *asn < UINT16_MAX)) | |
230 | snprintf(buf, len, "%u", *asn); | |
231 | else | |
232 | asn_asn2asdot(*asn, buf, len); | |
233 | return buf; | |
234 | } | |
235 | ||
17571c4a PG |
236 | static ssize_t printfrr_asnotation(struct fbuf *buf, struct printfrr_eargs *ea, |
237 | const void *ptr, | |
238 | enum asnotation_mode asnotation) | |
239 | { | |
240 | /* for alignemnt up to 33 chars - %33pASD for instance - */ | |
241 | char as_str[ASN_STRING_MAX_SIZE*3]; | |
242 | const as_t *asn; | |
243 | ||
244 | if (!ptr) | |
245 | return bputs(buf, "(null)"); | |
246 | asn = ptr; | |
4a8cd6ad | 247 | asn_asn2string(asn, as_str, sizeof(as_str), asnotation); |
17571c4a PG |
248 | return bputs(buf, as_str); |
249 | } | |
250 | ||
251 | printfrr_ext_autoreg_p("ASP", printfrr_asplain); | |
252 | static ssize_t printfrr_asplain(struct fbuf *buf, struct printfrr_eargs *ea, | |
253 | const void *ptr) | |
254 | { | |
255 | return printfrr_asnotation(buf, ea, ptr, ASNOTATION_PLAIN); | |
256 | } | |
257 | ||
258 | printfrr_ext_autoreg_p("ASD", printfrr_asdot); | |
259 | static ssize_t printfrr_asdot(struct fbuf *buf, struct printfrr_eargs *ea, | |
260 | const void *ptr) | |
261 | { | |
262 | return printfrr_asnotation(buf, ea, ptr, ASNOTATION_DOT); | |
263 | } | |
264 | ||
265 | printfrr_ext_autoreg_p("ASE", printfrr_asdotplus); | |
266 | static ssize_t printfrr_asdotplus(struct fbuf *buf, struct printfrr_eargs *ea, | |
267 | const void *ptr) | |
268 | { | |
269 | return printfrr_asnotation(buf, ea, ptr, ASNOTATION_DOTPLUS); | |
270 | } |