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aba5acdf SH |
1 | /* |
2 | * rtacct.c Applet to display contents of /proc/net/rt_acct. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <unistd.h> | |
16 | #include <fcntl.h> | |
17 | #include <string.h> | |
18 | #include <errno.h> | |
19 | #include <time.h> | |
20 | #include <sys/time.h> | |
21 | #include <fnmatch.h> | |
22 | #include <sys/file.h> | |
23 | #include <sys/socket.h> | |
24 | #include <sys/un.h> | |
25 | #include <sys/poll.h> | |
26 | #include <sys/wait.h> | |
27 | #include <sys/stat.h> | |
28 | #include <sys/mman.h> | |
29 | #include <signal.h> | |
30 | #include <math.h> | |
31 | ||
32 | #include "rt_names.h" | |
33 | ||
34 | #include <SNAPSHOT.h> | |
35 | ||
36 | int reset_history = 0; | |
37 | int ignore_history = 0; | |
38 | int no_output = 0; | |
39 | int no_update = 0; | |
40 | int scan_interval = 0; | |
41 | int time_constant = 0; | |
42 | int dump_zeros = 0; | |
43 | unsigned long magic_number = 0; | |
44 | double W; | |
45 | ||
46 | int generic_proc_open(char *env, char *name) | |
47 | { | |
48 | char store[1024]; | |
49 | char *p = getenv(env); | |
50 | if (!p) { | |
51 | p = getenv("PROC_ROOT") ? : "/proc"; | |
52 | snprintf(store, sizeof(store)-1, "%s/%s", p, name); | |
53 | p = store; | |
54 | } | |
55 | return open(store, O_RDONLY); | |
56 | } | |
57 | ||
58 | int net_rtacct_open(void) | |
59 | { | |
60 | return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct"); | |
61 | } | |
62 | ||
63 | __u32 rmap[256/4]; | |
64 | ||
65 | struct rtacct_data | |
66 | { | |
67 | __u32 ival[256*4]; | |
68 | ||
69 | unsigned long long val[256*4]; | |
70 | double rate[256*4]; | |
737f15f6 | 71 | char signature[128]; |
aba5acdf SH |
72 | }; |
73 | ||
74 | struct rtacct_data kern_db_static; | |
75 | ||
76 | struct rtacct_data *kern_db = &kern_db_static; | |
77 | struct rtacct_data *hist_db; | |
78 | ||
79 | void nread(int fd, char *buf, int tot) | |
80 | { | |
81 | int count = 0; | |
82 | ||
83 | while (count < tot) { | |
84 | int n = read(fd, buf+count, tot-count); | |
85 | if (n < 0) { | |
86 | if (errno == EINTR) | |
87 | continue; | |
88 | exit(-1); | |
89 | } | |
90 | if (n == 0) | |
91 | exit(-1); | |
92 | count += n; | |
93 | } | |
94 | } | |
95 | ||
96 | ||
97 | __u32 *read_kern_table(__u32 *tbl) | |
98 | { | |
99 | static __u32 *tbl_ptr; | |
100 | int fd; | |
101 | ||
102 | if (magic_number) { | |
103 | if (tbl_ptr != NULL) | |
104 | return tbl_ptr; | |
105 | ||
106 | fd = open("/dev/mem", O_RDONLY); | |
107 | if (fd < 0) { | |
108 | perror("magic open"); | |
109 | exit(-1); | |
110 | } | |
111 | tbl_ptr = mmap(NULL, 4096, | |
112 | PROT_READ, | |
113 | MAP_SHARED, | |
114 | fd, magic_number); | |
115 | if ((unsigned long)tbl_ptr == ~0UL) { | |
116 | perror("magic mmap"); | |
117 | exit(-1); | |
118 | } | |
119 | close(fd); | |
120 | return tbl_ptr; | |
121 | } | |
122 | ||
123 | fd = net_rtacct_open(); | |
124 | if (fd >= 0) { | |
125 | nread(fd, (char*)tbl, 256*16); | |
126 | close(fd); | |
127 | } else { | |
128 | memset(tbl, 0, 256*16); | |
129 | } | |
130 | return tbl; | |
131 | } | |
132 | ||
133 | void format_rate(FILE *fp, double rate) | |
134 | { | |
135 | char temp[64]; | |
136 | ||
137 | if (rate > 1024*1024) { | |
138 | sprintf(temp, "%uM", (unsigned)rint(rate/(1024*1024))); | |
139 | fprintf(fp, " %-10s", temp); | |
140 | } else if (rate > 1024) { | |
141 | sprintf(temp, "%uK", (unsigned)rint(rate/1024)); | |
142 | fprintf(fp, " %-10s", temp); | |
143 | } else | |
144 | fprintf(fp, " %-10u", (unsigned)rate); | |
145 | } | |
146 | ||
147 | void format_count(FILE *fp, unsigned long long val) | |
148 | { | |
149 | if (val > 1024*1024*1024) | |
150 | fprintf(fp, " %10lluM", val/(1024*1024)); | |
151 | else if (val > 1024*1024) | |
152 | fprintf(fp, " %10lluK", val/1024); | |
153 | else | |
154 | fprintf(fp, " %10llu", val); | |
155 | } | |
156 | ||
157 | void dump_abs_db(FILE *fp) | |
158 | { | |
159 | int realm; | |
160 | char b1[16]; | |
161 | ||
162 | if (!no_output) { | |
163 | fprintf(fp, "#%s\n", kern_db->signature); | |
164 | fprintf(fp, | |
165 | "%-10s " | |
166 | "%-10s " | |
167 | "%-10s " | |
168 | "%-10s " | |
169 | "%-10s " | |
170 | "\n" | |
171 | , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); | |
172 | fprintf(fp, | |
173 | "%-10s " | |
174 | "%-10s " | |
175 | "%-10s " | |
176 | "%-10s " | |
177 | "%-10s " | |
178 | "\n" | |
179 | , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); | |
180 | ||
181 | } | |
182 | ||
183 | for (realm=0; realm<256; realm++) { | |
184 | int i; | |
185 | unsigned long long *val; | |
186 | double *rate; | |
187 | ||
188 | if (!(rmap[realm>>5] & (1<<(realm&0x1f)))) | |
189 | continue; | |
190 | ||
191 | val = &kern_db->val[realm*4]; | |
192 | rate = &kern_db->rate[realm*4]; | |
193 | ||
194 | if (!dump_zeros && | |
195 | !val[0] && !rate[0] && | |
196 | !val[1] && !rate[1] && | |
197 | !val[2] && !rate[2] && | |
198 | !val[3] && !rate[3]) | |
199 | continue; | |
200 | ||
201 | if (hist_db) { | |
202 | memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4); | |
203 | } | |
204 | ||
205 | if (no_output) | |
206 | continue; | |
207 | ||
208 | fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1))); | |
209 | for (i = 0; i < 4; i++) | |
210 | format_count(fp, val[i]); | |
211 | fprintf(fp, "\n%-10s", ""); | |
212 | for (i = 0; i < 4; i++) | |
213 | format_rate(fp, rate[i]); | |
214 | fprintf(fp, "\n"); | |
215 | } | |
216 | } | |
217 | ||
218 | ||
219 | void dump_incr_db(FILE *fp) | |
220 | { | |
221 | int k, realm; | |
222 | char b1[16]; | |
223 | ||
224 | if (!no_output) { | |
225 | fprintf(fp, "#%s\n", kern_db->signature); | |
226 | fprintf(fp, | |
227 | "%-10s " | |
228 | "%-10s " | |
229 | "%-10s " | |
230 | "%-10s " | |
231 | "%-10s " | |
232 | "\n" | |
233 | , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); | |
234 | fprintf(fp, | |
235 | "%-10s " | |
236 | "%-10s " | |
237 | "%-10s " | |
238 | "%-10s " | |
239 | "%-10s " | |
240 | "\n" | |
241 | , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); | |
242 | } | |
243 | ||
244 | for (realm=0; realm<256; realm++) { | |
245 | int ovfl = 0; | |
246 | int i; | |
247 | unsigned long long *val; | |
248 | double *rate; | |
249 | unsigned long long rval[4]; | |
250 | ||
251 | if (!(rmap[realm>>5] & (1<<(realm&0x1f)))) | |
252 | continue; | |
253 | ||
254 | val = &kern_db->val[realm*4]; | |
255 | rate = &kern_db->rate[realm*4]; | |
256 | ||
257 | for (k=0; k<4; k++) { | |
258 | rval[k] = val[k]; | |
259 | if (rval[k] < hist_db->val[realm*4+k]) | |
260 | ovfl = 1; | |
261 | else | |
262 | rval[k] -= hist_db->val[realm*4+k]; | |
263 | } | |
264 | if (ovfl) { | |
265 | for (k=0; k<4; k++) | |
266 | rval[k] = val[k]; | |
267 | } | |
268 | if (hist_db) { | |
269 | memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4); | |
270 | } | |
271 | ||
272 | if (no_output) | |
273 | continue; | |
274 | ||
275 | if (!dump_zeros && | |
276 | !rval[0] && !rate[0] && | |
277 | !rval[1] && !rate[1] && | |
278 | !rval[2] && !rate[2] && | |
279 | !rval[3] && !rate[3]) | |
280 | continue; | |
281 | ||
282 | ||
283 | fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1))); | |
284 | for (i = 0; i < 4; i++) | |
285 | format_count(fp, rval[i]); | |
286 | fprintf(fp, "\n%-10s", ""); | |
287 | for (i = 0; i < 4; i++) | |
288 | format_rate(fp, rate[i]); | |
289 | fprintf(fp, "\n"); | |
290 | } | |
291 | } | |
292 | ||
293 | ||
294 | static int children; | |
295 | ||
296 | void sigchild(int signo) | |
297 | { | |
298 | } | |
299 | ||
300 | /* Server side only: read kernel data, update tables, calculate rates. */ | |
301 | ||
302 | void update_db(int interval) | |
303 | { | |
304 | int i; | |
305 | __u32 *ival; | |
306 | __u32 _ival[256*4]; | |
307 | ||
308 | ival = read_kern_table(_ival); | |
309 | ||
310 | for (i=0; i<256*4; i++) { | |
311 | double sample; | |
312 | __u32 incr = ival[i] - kern_db->ival[i]; | |
313 | ||
314 | if (ival[i] == 0 && incr == 0 && | |
315 | kern_db->val[i] == 0 && kern_db->rate[i] == 0) | |
316 | continue; | |
317 | ||
318 | kern_db->val[i] += incr; | |
319 | kern_db->ival[i] = ival[i]; | |
320 | sample = (double)(incr*1000)/interval; | |
321 | if (interval >= scan_interval) { | |
322 | kern_db->rate[i] += W*(sample-kern_db->rate[i]); | |
323 | } else if (interval >= 1000) { | |
324 | if (interval >= time_constant) { | |
325 | kern_db->rate[i] = sample; | |
326 | } else { | |
327 | double w = W*(double)interval/scan_interval; | |
328 | kern_db->rate[i] += w*(sample-kern_db->rate[i]); | |
329 | } | |
330 | } | |
331 | } | |
332 | } | |
333 | ||
334 | void send_db(int fd) | |
335 | { | |
336 | int tot = 0; | |
337 | ||
338 | while (tot < sizeof(*kern_db)) { | |
339 | int n = write(fd, ((char*)kern_db) + tot, sizeof(*kern_db)-tot); | |
340 | if (n < 0) { | |
341 | if (errno == EINTR) | |
342 | continue; | |
343 | return; | |
344 | } | |
345 | tot += n; | |
346 | } | |
347 | } | |
348 | ||
349 | ||
350 | ||
351 | #define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000) | |
352 | ||
353 | ||
354 | void pad_kern_table(struct rtacct_data *dat, __u32 *ival) | |
355 | { | |
356 | int i; | |
357 | memset(dat->rate, 0, sizeof(dat->rate)); | |
358 | if (dat->ival != ival) | |
359 | memcpy(dat->ival, ival, sizeof(dat->ival)); | |
360 | for (i=0; i<256*4; i++) | |
361 | dat->val[i] = ival[i]; | |
362 | } | |
363 | ||
364 | void server_loop(int fd) | |
365 | { | |
737f15f6 | 366 | struct timeval snaptime = { 0 }; |
aba5acdf SH |
367 | struct pollfd p; |
368 | p.fd = fd; | |
369 | p.events = p.revents = POLLIN; | |
370 | ||
737f15f6 SH |
371 | sprintf(kern_db->signature, |
372 | "%u.%lu sampling_interval=%d time_const=%d", | |
373 | (unsigned) getpid(), (unsigned long)random(), | |
374 | scan_interval/1000, time_constant/1000); | |
aba5acdf SH |
375 | |
376 | pad_kern_table(kern_db, read_kern_table(kern_db->ival)); | |
377 | ||
378 | for (;;) { | |
379 | int status; | |
380 | int tdiff; | |
381 | struct timeval now; | |
382 | gettimeofday(&now, NULL); | |
383 | tdiff = T_DIFF(now, snaptime); | |
384 | if (tdiff >= scan_interval) { | |
385 | update_db(tdiff); | |
386 | snaptime = now; | |
387 | tdiff = 0; | |
388 | } | |
389 | if (poll(&p, 1, tdiff + scan_interval) > 0 | |
390 | && (p.revents&POLLIN)) { | |
391 | int clnt = accept(fd, NULL, NULL); | |
392 | if (clnt >= 0) { | |
393 | pid_t pid; | |
394 | if (children >= 5) { | |
395 | close(clnt); | |
396 | } else if ((pid = fork()) != 0) { | |
397 | if (pid>0) | |
398 | children++; | |
399 | close(clnt); | |
400 | } else { | |
401 | if (tdiff > 0) | |
402 | update_db(tdiff); | |
403 | send_db(clnt); | |
404 | exit(0); | |
405 | } | |
406 | } | |
407 | } | |
408 | while (children && waitpid(-1, &status, WNOHANG) > 0) | |
409 | children--; | |
410 | } | |
411 | } | |
412 | ||
413 | int verify_forging(int fd) | |
414 | { | |
415 | struct ucred cred; | |
737f15f6 SH |
416 | socklen_t olen = sizeof(cred); |
417 | ||
aba5acdf SH |
418 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) || |
419 | olen < sizeof(cred)) | |
420 | return -1; | |
421 | if (cred.uid == getuid() || cred.uid == 0) | |
422 | return 0; | |
423 | return -1; | |
424 | } | |
425 | ||
426 | static void usage(void) __attribute__((noreturn)); | |
427 | ||
428 | static void usage(void) | |
429 | { | |
430 | fprintf(stderr, | |
431 | "Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n" | |
432 | ); | |
433 | exit(-1); | |
434 | } | |
435 | ||
436 | int main(int argc, char *argv[]) | |
437 | { | |
438 | char hist_name[128]; | |
439 | struct sockaddr_un sun; | |
440 | int ch; | |
441 | int fd; | |
442 | ||
443 | while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) { | |
444 | switch(ch) { | |
445 | case 'z': | |
446 | dump_zeros = 1; | |
447 | break; | |
448 | case 'r': | |
449 | reset_history = 1; | |
450 | break; | |
451 | case 'a': | |
452 | ignore_history = 1; | |
453 | break; | |
454 | case 's': | |
455 | no_update = 1; | |
456 | break; | |
457 | case 'n': | |
458 | no_output = 1; | |
459 | break; | |
460 | case 'd': | |
461 | scan_interval = 1000*atoi(optarg); | |
462 | break; | |
463 | case 't': | |
464 | if (sscanf(optarg, "%d", &time_constant) != 1 || | |
465 | time_constant <= 0) { | |
466 | fprintf(stderr, "rtacct: invalid time constant divisor\n"); | |
467 | exit(-1); | |
468 | } | |
469 | break; | |
470 | case 'v': | |
471 | case 'V': | |
472 | printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT); | |
473 | exit(0); | |
474 | case 'M': | |
475 | /* Some secret undocumented option, nobody | |
476 | * is expected to ask about its sense. See? | |
477 | */ | |
478 | sscanf(optarg, "%lx", &magic_number); | |
479 | break; | |
480 | case 'h': | |
481 | case '?': | |
482 | default: | |
483 | usage(); | |
484 | } | |
485 | } | |
486 | ||
487 | argc -= optind; | |
488 | argv += optind; | |
489 | ||
490 | if (argc) { | |
491 | while (argc > 0) { | |
492 | __u32 realm; | |
493 | if (rtnl_rtrealm_a2n(&realm, argv[0])) { | |
494 | fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]); | |
495 | exit(-1); | |
496 | } | |
497 | rmap[realm>>5] |= (1<<(realm&0x1f)); | |
498 | argc--; argv++; | |
499 | } | |
500 | } else { | |
501 | memset(rmap, ~0, sizeof(rmap)); | |
502 | /* Always suppress zeros. */ | |
503 | dump_zeros = 0; | |
504 | } | |
505 | ||
506 | sun.sun_family = AF_UNIX; | |
507 | sun.sun_path[0] = 0; | |
508 | sprintf(sun.sun_path+1, "rtacct%d", getuid()); | |
509 | ||
510 | if (scan_interval > 0) { | |
511 | if (time_constant == 0) | |
512 | time_constant = 60; | |
513 | time_constant *= 1000; | |
514 | W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant); | |
515 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
516 | perror("rtacct: socket"); | |
517 | exit(-1); | |
518 | } | |
519 | if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) { | |
520 | perror("rtacct: bind"); | |
521 | exit(-1); | |
522 | } | |
523 | if (listen(fd, 5) < 0) { | |
524 | perror("rtacct: listen"); | |
525 | exit(-1); | |
526 | } | |
527 | if (fork()) | |
528 | exit(0); | |
529 | chdir("/"); | |
530 | close(0); close(1); close(2); setsid(); | |
531 | signal(SIGPIPE, SIG_IGN); | |
532 | signal(SIGCHLD, sigchild); | |
533 | server_loop(fd); | |
534 | exit(0); | |
535 | } | |
536 | ||
537 | if (getenv("RTACCT_HISTORY")) | |
538 | snprintf(hist_name, sizeof(hist_name), getenv("RTACCT_HISTORY")); | |
539 | else | |
540 | sprintf(hist_name, "/tmp/.rtacct.u%d", getuid()); | |
541 | ||
542 | if (reset_history) | |
543 | unlink(hist_name); | |
544 | ||
545 | if (!ignore_history || !no_update) { | |
546 | struct stat stb; | |
547 | ||
548 | fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600); | |
549 | if (fd < 0) { | |
550 | perror("rtacct: open history file"); | |
551 | exit(-1); | |
552 | } | |
553 | if (flock(fd, LOCK_EX)) { | |
554 | perror("rtacct: flock history file"); | |
555 | exit(-1); | |
556 | } | |
557 | if (fstat(fd, &stb) != 0) { | |
558 | perror("rtacct: fstat history file"); | |
559 | exit(-1); | |
560 | } | |
561 | if (stb.st_nlink != 1 || stb.st_uid != getuid()) { | |
562 | fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n"); | |
563 | exit(-1); | |
564 | } | |
565 | if (stb.st_size != sizeof(*hist_db)) | |
566 | write(fd, kern_db, sizeof(*hist_db)); | |
567 | ||
568 | hist_db = mmap(NULL, sizeof(*hist_db), | |
569 | PROT_READ|PROT_WRITE, | |
570 | no_update ? MAP_PRIVATE : MAP_SHARED, | |
571 | fd, 0); | |
572 | ||
573 | if ((unsigned long)hist_db == ~0UL) { | |
574 | perror("mmap"); | |
575 | exit(-1); | |
576 | } | |
577 | ||
578 | if (!ignore_history) { | |
579 | FILE *tfp; | |
580 | long uptime; | |
581 | if ((tfp = fopen("/proc/uptime", "r")) != NULL) { | |
582 | if (fscanf(tfp, "%ld", &uptime) != 1) | |
583 | uptime = -1; | |
584 | fclose(tfp); | |
585 | } | |
586 | ||
587 | if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) { | |
588 | fprintf(stderr, "rtacct: history is aged out, resetting\n"); | |
589 | memset(hist_db, 0, sizeof(*hist_db)); | |
590 | } | |
591 | } | |
592 | ||
593 | close(fd); | |
594 | } | |
595 | ||
596 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 && | |
597 | (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0 | |
598 | || (strcpy(sun.sun_path+1, "rtacct0"), | |
599 | connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0)) | |
600 | && verify_forging(fd) == 0) { | |
601 | nread(fd, (char*)kern_db, sizeof(*kern_db)); | |
602 | if (hist_db && hist_db->signature[0] && | |
603 | strcmp(kern_db->signature, hist_db->signature)) { | |
604 | fprintf(stderr, "rtacct: history is stale, ignoring it.\n"); | |
605 | hist_db = NULL; | |
606 | } | |
607 | close(fd); | |
608 | } else { | |
609 | if (fd >= 0) | |
610 | close(fd); | |
611 | ||
612 | if (hist_db && hist_db->signature[0] && | |
613 | strcmp(hist_db->signature, "kernel")) { | |
614 | fprintf(stderr, "rtacct: history is stale, ignoring it.\n"); | |
615 | hist_db = NULL; | |
616 | } | |
617 | ||
618 | pad_kern_table(kern_db, read_kern_table(kern_db->ival)); | |
619 | strcpy(kern_db->signature, "kernel"); | |
620 | } | |
621 | ||
622 | if (ignore_history || hist_db == NULL) | |
623 | dump_abs_db(stdout); | |
624 | else | |
625 | dump_incr_db(stdout); | |
626 | ||
627 | exit(0); | |
628 | } |