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ca10883e DS |
1 | /* |
2 | Copyright (c) 2007, 2008 by Juliusz Chroboczek | |
3 | Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek | |
4 | ||
5 | Permission is hereby granted, free of charge, to any person obtaining a copy | |
6 | of this software and associated documentation files (the "Software"), to deal | |
7 | in the Software without restriction, including without limitation the rights | |
8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
9 | copies of the Software, and to permit persons to whom the Software is | |
10 | furnished to do so, subject to the following conditions: | |
11 | ||
12 | The above copyright notice and this permission notice shall be included in | |
13 | all copies or substantial portions of the Software. | |
14 | ||
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
21 | THE SOFTWARE. | |
22 | */ | |
23 | ||
b45ac5f5 DL |
24 | #ifdef HAVE_CONFIG_H |
25 | #include "config.h" | |
26 | #endif | |
27 | ||
ca10883e DS |
28 | #include <stdlib.h> |
29 | #include <stdarg.h> | |
30 | #include <string.h> | |
31 | #include <sys/time.h> | |
32 | #include <time.h> | |
33 | #include <stdio.h> | |
34 | #include <unistd.h> | |
35 | #include <limits.h> | |
36 | ||
37 | #include <sys/types.h> | |
38 | #include <sys/socket.h> | |
39 | #include <netinet/in.h> | |
40 | #include <arpa/inet.h> | |
41 | ||
5920b3eb RZ |
42 | #include "lib/network.h" |
43 | ||
ca10883e DS |
44 | #include "babel_main.h" |
45 | #include "babeld.h" | |
46 | #include "util.h" | |
47 | ||
48 | int | |
49 | roughly(int value) | |
50 | { | |
51 | if(value < 0) | |
52 | return -roughly(-value); | |
53 | else if(value <= 1) | |
54 | return value; | |
55 | else | |
5920b3eb | 56 | return value * 3 / 4 + frr_weak_random() % (value / 2); |
ca10883e DS |
57 | } |
58 | ||
59 | /* d = s1 - s2 */ | |
60 | void | |
61 | timeval_minus(struct timeval *d, | |
62 | const struct timeval *s1, const struct timeval *s2) | |
63 | { | |
64 | if(s1->tv_usec >= s2->tv_usec) { | |
65 | d->tv_usec = s1->tv_usec - s2->tv_usec; | |
66 | d->tv_sec = s1->tv_sec - s2->tv_sec; | |
67 | } else { | |
68 | d->tv_usec = s1->tv_usec + 1000000 - s2->tv_usec; | |
69 | d->tv_sec = s1->tv_sec - s2->tv_sec - 1; | |
70 | } | |
71 | } | |
72 | ||
73 | unsigned | |
74 | timeval_minus_msec(const struct timeval *s1, const struct timeval *s2) | |
75 | { | |
76 | if(s1->tv_sec < s2->tv_sec) | |
77 | return 0; | |
78 | ||
79 | /* Avoid overflow. */ | |
80 | if(s1->tv_sec - s2->tv_sec > 2000000) | |
81 | return 2000000000; | |
82 | ||
83 | if(s1->tv_sec > s2->tv_sec) | |
84 | return | |
85 | (unsigned)((unsigned)(s1->tv_sec - s2->tv_sec) * 1000 + | |
86 | ((int)s1->tv_usec - s2->tv_usec) / 1000); | |
87 | ||
88 | if(s1->tv_usec <= s2->tv_usec) | |
89 | return 0; | |
90 | ||
91 | return (unsigned)(s1->tv_usec - s2->tv_usec) / 1000u; | |
92 | } | |
93 | ||
94 | /* d = s + msecs */ | |
95 | void | |
96 | timeval_add_msec(struct timeval *d, const struct timeval *s, int msecs) | |
97 | { | |
98 | int usecs; | |
99 | d->tv_sec = s->tv_sec + msecs / 1000; | |
100 | usecs = s->tv_usec + (msecs % 1000) * 1000; | |
101 | if(usecs < 1000000) { | |
102 | d->tv_usec = usecs; | |
103 | } else { | |
104 | d->tv_usec = usecs - 1000000; | |
105 | d->tv_sec++; | |
106 | } | |
107 | } | |
108 | ||
109 | void | |
110 | set_timeout(struct timeval *timeout, int msecs) | |
111 | { | |
112 | timeval_add_msec(timeout, &babel_now, roughly(msecs)); | |
113 | } | |
114 | ||
115 | /* returns <0 if "s1" < "s2", etc. */ | |
116 | int | |
117 | timeval_compare(const struct timeval *s1, const struct timeval *s2) | |
118 | { | |
119 | if(s1->tv_sec < s2->tv_sec) | |
120 | return -1; | |
121 | else if(s1->tv_sec > s2->tv_sec) | |
122 | return 1; | |
123 | else if(s1->tv_usec < s2->tv_usec) | |
124 | return -1; | |
125 | else if(s1->tv_usec > s2->tv_usec) | |
126 | return 1; | |
127 | else | |
128 | return 0; | |
129 | } | |
130 | ||
131 | /* set d at min(d, s) */ | |
132 | /* {0, 0} represents infinity */ | |
133 | void | |
134 | timeval_min(struct timeval *d, const struct timeval *s) | |
135 | { | |
136 | if(s->tv_sec == 0) | |
137 | return; | |
138 | ||
139 | if(d->tv_sec == 0 || timeval_compare(d, s) > 0) { | |
140 | *d = *s; | |
141 | } | |
142 | } | |
143 | ||
144 | /* set d to min(d, x) with x in [secs, secs+1] */ | |
145 | void | |
146 | timeval_min_sec(struct timeval *d, time_t secs) | |
147 | { | |
148 | if(d->tv_sec == 0 || d->tv_sec > secs) { | |
149 | d->tv_sec = secs; | |
5920b3eb | 150 | d->tv_usec = frr_weak_random() % 1000000; |
ca10883e DS |
151 | } |
152 | } | |
153 | ||
154 | /* parse a float value in second and return the corresponding mili-seconds. | |
155 | For example: | |
156 | parse_msec("12.342345") returns 12342 */ | |
157 | int | |
158 | parse_msec(const char *string) | |
159 | { | |
160 | unsigned int in, fl; | |
161 | int i, j; | |
162 | ||
163 | in = fl = 0; | |
164 | i = 0; | |
165 | while(string[i] == ' ' || string[i] == '\t') | |
166 | i++; | |
167 | while(string[i] >= '0' && string[i] <= '9') { | |
168 | in = in * 10 + string[i] - '0'; | |
169 | i++; | |
170 | } | |
171 | if(string[i] == '.') { | |
172 | i++; | |
173 | j = 0; | |
174 | while(string[i] >= '0' && string[i] <= '9') { | |
175 | fl = fl * 10 + string[i] - '0'; | |
176 | i++; | |
177 | j++; | |
178 | } | |
179 | ||
180 | while(j > 3) { | |
181 | fl /= 10; | |
182 | j--; | |
183 | } | |
184 | while(j < 3) { | |
185 | fl *= 10; | |
186 | j++; | |
187 | } | |
188 | } | |
189 | ||
190 | while(string[i] == ' ' || string[i] == '\t') | |
191 | i++; | |
192 | ||
193 | if(string[i] == '\0') | |
194 | return in * 1000 + fl; | |
195 | ||
196 | return -1; | |
197 | } | |
198 | ||
199 | /* There's no good name for a positive int in C, call it nat. */ | |
200 | int | |
201 | parse_nat(const char *string) | |
202 | { | |
203 | long l; | |
204 | char *end; | |
205 | ||
206 | l = strtol(string, &end, 0); | |
207 | ||
208 | while(*end == ' ' || *end == '\t') | |
209 | end++; | |
210 | if(*end != '\0') | |
211 | return -1; | |
212 | ||
213 | if(l < 0 || l > INT_MAX) | |
214 | return -1; | |
215 | ||
216 | return (int)l; | |
217 | } | |
218 | ||
219 | int | |
220 | in_prefix(const unsigned char *restrict address, | |
221 | const unsigned char *restrict prefix, unsigned char plen) | |
222 | { | |
223 | unsigned char m; | |
224 | ||
225 | if(plen > 128) | |
226 | plen = 128; | |
227 | ||
228 | if(memcmp(address, prefix, plen / 8) != 0) | |
229 | return 0; | |
230 | ||
231 | if(plen % 8 == 0) | |
232 | return 1; | |
233 | ||
234 | m = 0xFF << (8 - (plen % 8)); | |
235 | ||
236 | return ((address[plen / 8] & m) == (prefix[plen / 8] & m)); | |
237 | } | |
238 | ||
239 | unsigned char * | |
240 | mask_prefix(unsigned char *restrict ret, | |
241 | const unsigned char *restrict prefix, unsigned char plen) | |
242 | { | |
243 | if(plen >= 128) { | |
244 | memcpy(ret, prefix, 16); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | memset(ret, 0, 16); | |
249 | memcpy(ret, prefix, plen / 8); | |
250 | if(plen % 8 != 0) | |
251 | ret[plen / 8] = | |
252 | (prefix[plen / 8] & ((0xFF << (8 - (plen % 8))) & 0xFF)); | |
253 | return ret; | |
254 | } | |
255 | ||
256 | const unsigned char v4prefix[16] = | |
257 | {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xFF, 0xFF, 0, 0, 0, 0 }; | |
258 | ||
259 | static const unsigned char llprefix[16] = | |
260 | {0xFE, 0x80}; | |
261 | ||
262 | const char * | |
263 | format_address(const unsigned char *address) | |
264 | { | |
265 | static char buf[4][INET6_ADDRSTRLEN]; | |
266 | static int i = 0; | |
267 | i = (i + 1) % 4; | |
268 | if(v4mapped(address)) | |
269 | inet_ntop(AF_INET, address + 12, buf[i], INET6_ADDRSTRLEN); | |
270 | else | |
271 | inet_ntop(AF_INET6, address, buf[i], INET6_ADDRSTRLEN); | |
272 | return buf[i]; | |
273 | } | |
274 | ||
275 | const char * | |
276 | format_prefix(const unsigned char *prefix, unsigned char plen) | |
277 | { | |
278 | static char buf[4][INET6_ADDRSTRLEN + 4]; | |
279 | static int i = 0; | |
280 | int n; | |
281 | i = (i + 1) % 4; | |
282 | if(plen >= 96 && v4mapped(prefix)) { | |
283 | inet_ntop(AF_INET, prefix + 12, buf[i], INET6_ADDRSTRLEN); | |
284 | n = strlen(buf[i]); | |
285 | snprintf(buf[i] + n, INET6_ADDRSTRLEN + 4 - n, "/%d", plen - 96); | |
286 | } else { | |
287 | inet_ntop(AF_INET6, prefix, buf[i], INET6_ADDRSTRLEN); | |
288 | n = strlen(buf[i]); | |
289 | snprintf(buf[i] + n, INET6_ADDRSTRLEN + 4 - n, "/%d", plen); | |
290 | } | |
291 | return buf[i]; | |
292 | } | |
293 | ||
294 | const char * | |
295 | format_eui64(const unsigned char *eui) | |
296 | { | |
297 | static char buf[4][28]; | |
298 | static int i = 0; | |
299 | i = (i + 1) % 4; | |
300 | snprintf(buf[i], 28, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x", | |
301 | eui[0], eui[1], eui[2], eui[3], | |
302 | eui[4], eui[5], eui[6], eui[7]); | |
303 | return buf[i]; | |
304 | } | |
305 | ||
306 | const char * | |
307 | format_thousands(unsigned int value) | |
308 | { | |
309 | static char buf[4][15]; | |
310 | static int i = 0; | |
311 | i = (i + 1) % 4; | |
2ec42b85 | 312 | snprintf(buf[i], 15, "%u.%.3u", value / 1000, value % 1000); |
ca10883e DS |
313 | return buf[i]; |
314 | } | |
315 | ||
316 | int | |
317 | parse_address(const char *address, unsigned char *addr_r, int *af_r) | |
318 | { | |
319 | struct in_addr ina; | |
320 | struct in6_addr ina6; | |
321 | int rc; | |
322 | ||
323 | rc = inet_pton(AF_INET, address, &ina); | |
324 | if(rc > 0) { | |
325 | v4tov6(addr_r, (const unsigned char *)&ina); | |
326 | if(af_r) *af_r = AF_INET; | |
327 | return 0; | |
328 | } | |
329 | ||
330 | rc = inet_pton(AF_INET6, address, &ina6); | |
331 | if(rc > 0) { | |
332 | memcpy(addr_r, &ina6, 16); | |
333 | if(af_r) *af_r = AF_INET6; | |
334 | return 0; | |
335 | } | |
336 | ||
337 | return -1; | |
338 | } | |
339 | ||
340 | int | |
341 | parse_eui64(const char *eui, unsigned char *eui_r) | |
342 | { | |
343 | int n; | |
344 | n = sscanf(eui, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx", | |
345 | &eui_r[0], &eui_r[1], &eui_r[2], &eui_r[3], | |
346 | &eui_r[4], &eui_r[5], &eui_r[6], &eui_r[7]); | |
347 | if(n == 8) | |
348 | return 0; | |
349 | ||
350 | n = sscanf(eui, "%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx-%02hhx", | |
351 | &eui_r[0], &eui_r[1], &eui_r[2], &eui_r[3], | |
352 | &eui_r[4], &eui_r[5], &eui_r[6], &eui_r[7]); | |
353 | if(n == 8) | |
354 | return 0; | |
355 | ||
356 | n = sscanf(eui, "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx", | |
357 | &eui_r[0], &eui_r[1], &eui_r[2], | |
358 | &eui_r[5], &eui_r[6], &eui_r[7]); | |
359 | if(n == 6) { | |
360 | eui_r[3] = 0xFF; | |
361 | eui_r[4] = 0xFE; | |
362 | return 0; | |
363 | } | |
364 | return -1; | |
365 | } | |
366 | ||
367 | int | |
368 | wait_for_fd(int direction, int fd, int msecs) | |
369 | { | |
370 | fd_set fds; | |
371 | int rc; | |
372 | struct timeval tv; | |
373 | ||
374 | tv.tv_sec = msecs / 1000; | |
375 | tv.tv_usec = (msecs % 1000) * 1000; | |
376 | ||
377 | FD_ZERO(&fds); | |
378 | FD_SET(fd, &fds); | |
379 | if(direction) | |
380 | rc = select(fd + 1, NULL, &fds, NULL, &tv); | |
381 | else | |
382 | rc = select(fd + 1, &fds, NULL, NULL, &tv); | |
383 | ||
384 | return rc; | |
385 | } | |
386 | ||
387 | int | |
388 | martian_prefix(const unsigned char *prefix, int plen) | |
389 | { | |
390 | return | |
391 | (plen >= 8 && prefix[0] == 0xFF) || | |
392 | (plen >= 10 && prefix[0] == 0xFE && (prefix[1] & 0xC0) == 0x80) || | |
393 | (plen >= 128 && memcmp(prefix, zeroes, 15) == 0 && | |
394 | (prefix[15] == 0 || prefix[15] == 1)) || | |
395 | (plen >= 96 && v4mapped(prefix) && | |
396 | ((plen >= 104 && (prefix[12] == 127 || prefix[12] == 0)) || | |
397 | (plen >= 100 && (prefix[12] & 0xE0) == 0xE0))); | |
398 | } | |
399 | ||
400 | int | |
401 | linklocal(const unsigned char *address) | |
402 | { | |
403 | return memcmp(address, llprefix, 8) == 0; | |
404 | } | |
405 | ||
406 | int | |
407 | v4mapped(const unsigned char *address) | |
408 | { | |
409 | return memcmp(address, v4prefix, 12) == 0; | |
410 | } | |
411 | ||
412 | void | |
413 | v4tov6(unsigned char *dst, const unsigned char *src) | |
414 | { | |
415 | memcpy(dst, v4prefix, 12); | |
416 | memcpy(dst + 12, src, 4); | |
417 | } | |
418 | ||
419 | void | |
420 | inaddr_to_uchar(unsigned char *dest, const struct in_addr *src) | |
421 | { | |
422 | v4tov6(dest, (const unsigned char *)src); | |
423 | assert(v4mapped(dest)); | |
424 | } | |
425 | ||
426 | void | |
427 | uchar_to_inaddr(struct in_addr *dest, const unsigned char *src) | |
428 | { | |
429 | assert(v4mapped(src)); | |
430 | memcpy(dest, src + 12, 4); | |
431 | } | |
432 | ||
433 | void | |
434 | in6addr_to_uchar(unsigned char *dest, const struct in6_addr *src) | |
435 | { | |
436 | memcpy(dest, src, 16); | |
437 | } | |
438 | ||
439 | void | |
440 | uchar_to_in6addr(struct in6_addr *dest, const unsigned char *src) | |
441 | { | |
442 | memcpy(dest, src, 16); | |
443 | } | |
444 | ||
445 | int | |
4d762f26 | 446 | daemonise(void) |
ca10883e DS |
447 | { |
448 | int rc; | |
449 | ||
450 | fflush(stdout); | |
451 | fflush(stderr); | |
452 | ||
453 | rc = fork(); | |
454 | if(rc < 0) | |
455 | return -1; | |
456 | ||
457 | if(rc > 0) | |
458 | exit(0); | |
459 | ||
460 | rc = setsid(); | |
461 | if(rc < 0) | |
462 | return -1; | |
463 | ||
464 | return 1; | |
465 | } |