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
generic_proc_open(const char * env,const char * name)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
net_rtacct_open(void)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];
71 char signature[128];
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
nread(int fd,char * buf,int tot)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
read_kern_table(__u32 * tbl)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
format_rate(FILE * fp,double rate)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
format_count(FILE * fp,unsigned long long val)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
dump_abs_db(FILE * fp)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
dump_incr_db(FILE * fp)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
sigchild(int signo)296 void sigchild(int signo)
297 {
298 }
299
300 /* Server side only: read kernel data, update tables, calculate rates. */
301
update_db(int interval)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
send_db(int fd)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
pad_kern_table(struct rtacct_data * dat,__u32 * ival)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
server_loop(int fd)364 void server_loop(int fd)
365 {
366 struct timeval snaptime = { 0 };
367 struct pollfd p;
368 p.fd = fd;
369 p.events = p.revents = POLLIN;
370
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);
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
verify_forging(int fd)413 int verify_forging(int fd)
414 {
415 struct ucred cred;
416 socklen_t olen = sizeof(cred);
417
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
usage(void)428 static void usage(void)
429 {
430 fprintf(stderr,
431 "Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
432 );
433 exit(-1);
434 }
435
main(int argc,char * argv[])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 (daemon(0, 0)) {
528 perror("rtacct: daemon");
529 exit(-1);
530 }
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), "%s", 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 if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
567 perror("rtacct: write history file");
568 exit(-1);
569 }
570
571 hist_db = mmap(NULL, sizeof(*hist_db),
572 PROT_READ|PROT_WRITE,
573 no_update ? MAP_PRIVATE : MAP_SHARED,
574 fd, 0);
575
576 if ((unsigned long)hist_db == ~0UL) {
577 perror("mmap");
578 exit(-1);
579 }
580
581 if (!ignore_history) {
582 FILE *tfp;
583 long uptime = -1;
584 if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
585 if (fscanf(tfp, "%ld", &uptime) != 1)
586 uptime = -1;
587 fclose(tfp);
588 }
589
590 if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
591 fprintf(stderr, "rtacct: history is aged out, resetting\n");
592 memset(hist_db, 0, sizeof(*hist_db));
593 }
594 }
595
596 close(fd);
597 }
598
599 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
600 (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
601 || (strcpy(sun.sun_path+1, "rtacct0"),
602 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
603 && verify_forging(fd) == 0) {
604 nread(fd, (char*)kern_db, sizeof(*kern_db));
605 if (hist_db && hist_db->signature[0] &&
606 strcmp(kern_db->signature, hist_db->signature)) {
607 fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
608 hist_db = NULL;
609 }
610 close(fd);
611 } else {
612 if (fd >= 0)
613 close(fd);
614
615 if (hist_db && hist_db->signature[0] &&
616 strcmp(hist_db->signature, "kernel")) {
617 fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
618 hist_db = NULL;
619 }
620
621 pad_kern_table(kern_db, read_kern_table(kern_db->ival));
622 strcpy(kern_db->signature, "kernel");
623 }
624
625 if (ignore_history || hist_db == NULL)
626 dump_abs_db(stdout);
627 else
628 dump_incr_db(stdout);
629
630 exit(0);
631 }
632