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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 | static int generic_proc_open(const char *env, const 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(p, O_RDONLY); | |
56 | } | |
57 | ||
58 | static int net_rtacct_open(void) | |
59 | { | |
60 | return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct"); | |
61 | } | |
62 | ||
63 | static __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]; | |
71 | char signature[128]; | |
72 | }; | |
73 | ||
74 | static struct rtacct_data kern_db_static; | |
75 | ||
76 | static struct rtacct_data *kern_db = &kern_db_static; | |
77 | static struct rtacct_data *hist_db; | |
78 | ||
79 | static 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 | static __u32 *read_kern_table(__u32 *tbl) | |
97 | { | |
98 | static __u32 *tbl_ptr; | |
99 | int fd; | |
100 | ||
101 | if (magic_number) { | |
102 | if (tbl_ptr != NULL) | |
103 | return tbl_ptr; | |
104 | ||
105 | fd = open("/dev/mem", O_RDONLY); | |
106 | if (fd < 0) { | |
107 | perror("magic open"); | |
108 | exit(-1); | |
109 | } | |
110 | tbl_ptr = mmap(NULL, 4096, | |
111 | PROT_READ, | |
112 | MAP_SHARED, | |
113 | fd, magic_number); | |
114 | if ((unsigned long)tbl_ptr == ~0UL) { | |
115 | perror("magic mmap"); | |
116 | exit(-1); | |
117 | } | |
118 | close(fd); | |
119 | return tbl_ptr; | |
120 | } | |
121 | ||
122 | fd = net_rtacct_open(); | |
123 | if (fd >= 0) { | |
124 | nread(fd, (char*)tbl, 256*16); | |
125 | close(fd); | |
126 | } else { | |
127 | memset(tbl, 0, 256*16); | |
128 | } | |
129 | return tbl; | |
130 | } | |
131 | ||
132 | static void format_rate(FILE *fp, double rate) | |
133 | { | |
134 | char temp[64]; | |
135 | ||
136 | if (rate > 1024*1024) { | |
137 | sprintf(temp, "%uM", (unsigned)rint(rate/(1024*1024))); | |
138 | fprintf(fp, " %-10s", temp); | |
139 | } else if (rate > 1024) { | |
140 | sprintf(temp, "%uK", (unsigned)rint(rate/1024)); | |
141 | fprintf(fp, " %-10s", temp); | |
142 | } else | |
143 | fprintf(fp, " %-10u", (unsigned)rate); | |
144 | } | |
145 | ||
146 | static void format_count(FILE *fp, unsigned long long val) | |
147 | { | |
148 | if (val > 1024*1024*1024) | |
149 | fprintf(fp, " %10lluM", val/(1024*1024)); | |
150 | else if (val > 1024*1024) | |
151 | fprintf(fp, " %10lluK", val/1024); | |
152 | else | |
153 | fprintf(fp, " %10llu", val); | |
154 | } | |
155 | ||
156 | static void dump_abs_db(FILE *fp) | |
157 | { | |
158 | int realm; | |
159 | char b1[16]; | |
160 | ||
161 | if (!no_output) { | |
162 | fprintf(fp, "#%s\n", kern_db->signature); | |
163 | fprintf(fp, | |
164 | "%-10s " | |
165 | "%-10s " | |
166 | "%-10s " | |
167 | "%-10s " | |
168 | "%-10s " | |
169 | "\n" | |
170 | , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); | |
171 | fprintf(fp, | |
172 | "%-10s " | |
173 | "%-10s " | |
174 | "%-10s " | |
175 | "%-10s " | |
176 | "%-10s " | |
177 | "\n" | |
178 | , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); | |
179 | ||
180 | } | |
181 | ||
182 | for (realm=0; realm<256; realm++) { | |
183 | int i; | |
184 | unsigned long long *val; | |
185 | double *rate; | |
186 | ||
187 | if (!(rmap[realm>>5] & (1<<(realm&0x1f)))) | |
188 | continue; | |
189 | ||
190 | val = &kern_db->val[realm*4]; | |
191 | rate = &kern_db->rate[realm*4]; | |
192 | ||
193 | if (!dump_zeros && | |
194 | !val[0] && !rate[0] && | |
195 | !val[1] && !rate[1] && | |
196 | !val[2] && !rate[2] && | |
197 | !val[3] && !rate[3]) | |
198 | continue; | |
199 | ||
200 | if (hist_db) { | |
201 | memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4); | |
202 | } | |
203 | ||
204 | if (no_output) | |
205 | continue; | |
206 | ||
207 | fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1))); | |
208 | for (i = 0; i < 4; i++) | |
209 | format_count(fp, val[i]); | |
210 | fprintf(fp, "\n%-10s", ""); | |
211 | for (i = 0; i < 4; i++) | |
212 | format_rate(fp, rate[i]); | |
213 | fprintf(fp, "\n"); | |
214 | } | |
215 | } | |
216 | ||
217 | ||
218 | static void dump_incr_db(FILE *fp) | |
219 | { | |
220 | int k, realm; | |
221 | char b1[16]; | |
222 | ||
223 | if (!no_output) { | |
224 | fprintf(fp, "#%s\n", kern_db->signature); | |
225 | fprintf(fp, | |
226 | "%-10s " | |
227 | "%-10s " | |
228 | "%-10s " | |
229 | "%-10s " | |
230 | "%-10s " | |
231 | "\n" | |
232 | , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom"); | |
233 | fprintf(fp, | |
234 | "%-10s " | |
235 | "%-10s " | |
236 | "%-10s " | |
237 | "%-10s " | |
238 | "%-10s " | |
239 | "\n" | |
240 | , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom"); | |
241 | } | |
242 | ||
243 | for (realm=0; realm<256; realm++) { | |
244 | int ovfl = 0; | |
245 | int i; | |
246 | unsigned long long *val; | |
247 | double *rate; | |
248 | unsigned long long rval[4]; | |
249 | ||
250 | if (!(rmap[realm>>5] & (1<<(realm&0x1f)))) | |
251 | continue; | |
252 | ||
253 | val = &kern_db->val[realm*4]; | |
254 | rate = &kern_db->rate[realm*4]; | |
255 | ||
256 | for (k=0; k<4; k++) { | |
257 | rval[k] = val[k]; | |
258 | if (rval[k] < hist_db->val[realm*4+k]) | |
259 | ovfl = 1; | |
260 | else | |
261 | rval[k] -= hist_db->val[realm*4+k]; | |
262 | } | |
263 | if (ovfl) { | |
264 | for (k=0; k<4; k++) | |
265 | rval[k] = val[k]; | |
266 | } | |
267 | if (hist_db) { | |
268 | memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4); | |
269 | } | |
270 | ||
271 | if (no_output) | |
272 | continue; | |
273 | ||
274 | if (!dump_zeros && | |
275 | !rval[0] && !rate[0] && | |
276 | !rval[1] && !rate[1] && | |
277 | !rval[2] && !rate[2] && | |
278 | !rval[3] && !rate[3]) | |
279 | continue; | |
280 | ||
281 | ||
282 | fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1))); | |
283 | for (i = 0; i < 4; i++) | |
284 | format_count(fp, rval[i]); | |
285 | fprintf(fp, "\n%-10s", ""); | |
286 | for (i = 0; i < 4; i++) | |
287 | format_rate(fp, rate[i]); | |
288 | fprintf(fp, "\n"); | |
289 | } | |
290 | } | |
291 | ||
292 | ||
293 | static int children; | |
294 | ||
295 | static void sigchild(int signo) | |
296 | { | |
297 | } | |
298 | ||
299 | /* Server side only: read kernel data, update tables, calculate rates. */ | |
300 | ||
301 | static void update_db(int interval) | |
302 | { | |
303 | int i; | |
304 | __u32 *ival; | |
305 | __u32 _ival[256*4]; | |
306 | ||
307 | ival = read_kern_table(_ival); | |
308 | ||
309 | for (i=0; i<256*4; i++) { | |
310 | double sample; | |
311 | __u32 incr = ival[i] - kern_db->ival[i]; | |
312 | ||
313 | if (ival[i] == 0 && incr == 0 && | |
314 | kern_db->val[i] == 0 && kern_db->rate[i] == 0) | |
315 | continue; | |
316 | ||
317 | kern_db->val[i] += incr; | |
318 | kern_db->ival[i] = ival[i]; | |
319 | sample = (double)(incr*1000)/interval; | |
320 | if (interval >= scan_interval) { | |
321 | kern_db->rate[i] += W*(sample-kern_db->rate[i]); | |
322 | } else if (interval >= 1000) { | |
323 | if (interval >= time_constant) { | |
324 | kern_db->rate[i] = sample; | |
325 | } else { | |
326 | double w = W*(double)interval/scan_interval; | |
327 | kern_db->rate[i] += w*(sample-kern_db->rate[i]); | |
328 | } | |
329 | } | |
330 | } | |
331 | } | |
332 | ||
333 | static void send_db(int fd) | |
334 | { | |
335 | int tot = 0; | |
336 | ||
337 | while (tot < sizeof(*kern_db)) { | |
338 | int n = write(fd, ((char*)kern_db) + tot, sizeof(*kern_db)-tot); | |
339 | if (n < 0) { | |
340 | if (errno == EINTR) | |
341 | continue; | |
342 | return; | |
343 | } | |
344 | tot += n; | |
345 | } | |
346 | } | |
347 | ||
348 | ||
349 | ||
350 | #define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000) | |
351 | ||
352 | ||
353 | static void pad_kern_table(struct rtacct_data *dat, __u32 *ival) | |
354 | { | |
355 | int i; | |
356 | memset(dat->rate, 0, sizeof(dat->rate)); | |
357 | if (dat->ival != ival) | |
358 | memcpy(dat->ival, ival, sizeof(dat->ival)); | |
359 | for (i=0; i<256*4; i++) | |
360 | dat->val[i] = ival[i]; | |
361 | } | |
362 | ||
363 | static void server_loop(int fd) | |
364 | { | |
365 | struct timeval snaptime = { 0 }; | |
366 | struct pollfd p; | |
367 | p.fd = fd; | |
368 | p.events = p.revents = POLLIN; | |
369 | ||
370 | sprintf(kern_db->signature, | |
371 | "%u.%lu sampling_interval=%d time_const=%d", | |
372 | (unsigned) getpid(), (unsigned long)random(), | |
373 | scan_interval/1000, time_constant/1000); | |
374 | ||
375 | pad_kern_table(kern_db, read_kern_table(kern_db->ival)); | |
376 | ||
377 | for (;;) { | |
378 | int status; | |
379 | int tdiff; | |
380 | struct timeval now; | |
381 | gettimeofday(&now, NULL); | |
382 | tdiff = T_DIFF(now, snaptime); | |
383 | if (tdiff >= scan_interval) { | |
384 | update_db(tdiff); | |
385 | snaptime = now; | |
386 | tdiff = 0; | |
387 | } | |
388 | if (poll(&p, 1, tdiff + scan_interval) > 0 | |
389 | && (p.revents&POLLIN)) { | |
390 | int clnt = accept(fd, NULL, NULL); | |
391 | if (clnt >= 0) { | |
392 | pid_t pid; | |
393 | if (children >= 5) { | |
394 | close(clnt); | |
395 | } else if ((pid = fork()) != 0) { | |
396 | if (pid>0) | |
397 | children++; | |
398 | close(clnt); | |
399 | } else { | |
400 | if (tdiff > 0) | |
401 | update_db(tdiff); | |
402 | send_db(clnt); | |
403 | exit(0); | |
404 | } | |
405 | } | |
406 | } | |
407 | while (children && waitpid(-1, &status, WNOHANG) > 0) | |
408 | children--; | |
409 | } | |
410 | } | |
411 | ||
412 | static int verify_forging(int fd) | |
413 | { | |
414 | struct ucred cred; | |
415 | socklen_t olen = sizeof(cred); | |
416 | ||
417 | if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) || | |
418 | olen < sizeof(cred)) | |
419 | return -1; | |
420 | if (cred.uid == getuid() || cred.uid == 0) | |
421 | return 0; | |
422 | return -1; | |
423 | } | |
424 | ||
425 | static void usage(void) __attribute__((noreturn)); | |
426 | ||
427 | static void usage(void) | |
428 | { | |
429 | fprintf(stderr, | |
430 | "Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n" | |
431 | ); | |
432 | exit(-1); | |
433 | } | |
434 | ||
435 | int main(int argc, char *argv[]) | |
436 | { | |
437 | char hist_name[128]; | |
438 | struct sockaddr_un sun; | |
439 | int ch; | |
440 | int fd; | |
441 | ||
442 | while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) { | |
443 | switch(ch) { | |
444 | case 'z': | |
445 | dump_zeros = 1; | |
446 | break; | |
447 | case 'r': | |
448 | reset_history = 1; | |
449 | break; | |
450 | case 'a': | |
451 | ignore_history = 1; | |
452 | break; | |
453 | case 's': | |
454 | no_update = 1; | |
455 | break; | |
456 | case 'n': | |
457 | no_output = 1; | |
458 | break; | |
459 | case 'd': | |
460 | scan_interval = 1000*atoi(optarg); | |
461 | break; | |
462 | case 't': | |
463 | if (sscanf(optarg, "%d", &time_constant) != 1 || | |
464 | time_constant <= 0) { | |
465 | fprintf(stderr, "rtacct: invalid time constant divisor\n"); | |
466 | exit(-1); | |
467 | } | |
468 | break; | |
469 | case 'v': | |
470 | case 'V': | |
471 | printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT); | |
472 | exit(0); | |
473 | case 'M': | |
474 | /* Some secret undocumented option, nobody | |
475 | * is expected to ask about its sense. See? | |
476 | */ | |
477 | sscanf(optarg, "%lx", &magic_number); | |
478 | break; | |
479 | case 'h': | |
480 | case '?': | |
481 | default: | |
482 | usage(); | |
483 | } | |
484 | } | |
485 | ||
486 | argc -= optind; | |
487 | argv += optind; | |
488 | ||
489 | if (argc) { | |
490 | while (argc > 0) { | |
491 | __u32 realm; | |
492 | if (rtnl_rtrealm_a2n(&realm, argv[0])) { | |
493 | fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]); | |
494 | exit(-1); | |
495 | } | |
496 | rmap[realm>>5] |= (1<<(realm&0x1f)); | |
497 | argc--; argv++; | |
498 | } | |
499 | } else { | |
500 | memset(rmap, ~0, sizeof(rmap)); | |
501 | /* Always suppress zeros. */ | |
502 | dump_zeros = 0; | |
503 | } | |
504 | ||
505 | sun.sun_family = AF_UNIX; | |
506 | sun.sun_path[0] = 0; | |
507 | sprintf(sun.sun_path+1, "rtacct%d", getuid()); | |
508 | ||
509 | if (scan_interval > 0) { | |
510 | if (time_constant == 0) | |
511 | time_constant = 60; | |
512 | time_constant *= 1000; | |
513 | W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant); | |
514 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) { | |
515 | perror("rtacct: socket"); | |
516 | exit(-1); | |
517 | } | |
518 | if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) { | |
519 | perror("rtacct: bind"); | |
520 | exit(-1); | |
521 | } | |
522 | if (listen(fd, 5) < 0) { | |
523 | perror("rtacct: listen"); | |
524 | exit(-1); | |
525 | } | |
526 | if (daemon(0, 0)) { | |
527 | perror("rtacct: daemon"); | |
528 | exit(-1); | |
529 | } | |
530 | signal(SIGPIPE, SIG_IGN); | |
531 | signal(SIGCHLD, sigchild); | |
532 | server_loop(fd); | |
533 | exit(0); | |
534 | } | |
535 | ||
536 | if (getenv("RTACCT_HISTORY")) | |
537 | snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY")); | |
538 | else | |
539 | sprintf(hist_name, "/tmp/.rtacct.u%d", getuid()); | |
540 | ||
541 | if (reset_history) | |
542 | unlink(hist_name); | |
543 | ||
544 | if (!ignore_history || !no_update) { | |
545 | struct stat stb; | |
546 | ||
547 | fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600); | |
548 | if (fd < 0) { | |
549 | perror("rtacct: open history file"); | |
550 | exit(-1); | |
551 | } | |
552 | if (flock(fd, LOCK_EX)) { | |
553 | perror("rtacct: flock history file"); | |
554 | exit(-1); | |
555 | } | |
556 | if (fstat(fd, &stb) != 0) { | |
557 | perror("rtacct: fstat history file"); | |
558 | exit(-1); | |
559 | } | |
560 | if (stb.st_nlink != 1 || stb.st_uid != getuid()) { | |
561 | fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n"); | |
562 | exit(-1); | |
563 | } | |
564 | if (stb.st_size != sizeof(*hist_db)) | |
565 | if (write(fd, kern_db, sizeof(*hist_db)) < 0) { | |
566 | perror("rtacct: write history file"); | |
567 | exit(-1); | |
568 | } | |
569 | ||
570 | hist_db = mmap(NULL, sizeof(*hist_db), | |
571 | PROT_READ|PROT_WRITE, | |
572 | no_update ? MAP_PRIVATE : MAP_SHARED, | |
573 | fd, 0); | |
574 | ||
575 | if ((unsigned long)hist_db == ~0UL) { | |
576 | perror("mmap"); | |
577 | exit(-1); | |
578 | } | |
579 | ||
580 | if (!ignore_history) { | |
581 | FILE *tfp; | |
582 | long uptime = -1; | |
583 | if ((tfp = fopen("/proc/uptime", "r")) != NULL) { | |
584 | if (fscanf(tfp, "%ld", &uptime) != 1) | |
585 | uptime = -1; | |
586 | fclose(tfp); | |
587 | } | |
588 | ||
589 | if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) { | |
590 | fprintf(stderr, "rtacct: history is aged out, resetting\n"); | |
591 | memset(hist_db, 0, sizeof(*hist_db)); | |
592 | } | |
593 | } | |
594 | ||
595 | close(fd); | |
596 | } | |
597 | ||
598 | if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 && | |
599 | (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0 | |
600 | || (strcpy(sun.sun_path+1, "rtacct0"), | |
601 | connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0)) | |
602 | && verify_forging(fd) == 0) { | |
603 | nread(fd, (char*)kern_db, sizeof(*kern_db)); | |
604 | if (hist_db && hist_db->signature[0] && | |
605 | strcmp(kern_db->signature, hist_db->signature)) { | |
606 | fprintf(stderr, "rtacct: history is stale, ignoring it.\n"); | |
607 | hist_db = NULL; | |
608 | } | |
609 | close(fd); | |
610 | } else { | |
611 | if (fd >= 0) | |
612 | close(fd); | |
613 | ||
614 | if (hist_db && hist_db->signature[0] && | |
615 | strcmp(hist_db->signature, "kernel")) { | |
616 | fprintf(stderr, "rtacct: history is stale, ignoring it.\n"); | |
617 | hist_db = NULL; | |
618 | } | |
619 | ||
620 | pad_kern_table(kern_db, read_kern_table(kern_db->ival)); | |
621 | strcpy(kern_db->signature, "kernel"); | |
622 | } | |
623 | ||
624 | if (ignore_history || hist_db == NULL) | |
625 | dump_abs_db(stdout); | |
626 | else | |
627 | dump_incr_db(stdout); | |
628 | ||
629 | exit(0); | |
630 | } |