2 * rtacct.c Applet to display contents of /proc/net/rt_acct.
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
23 #include <sys/socket.h>
43 unsigned long magic_number;
46 static int generic_proc_open(const char *env, const char *name)
49 char *p = getenv(env);
52 p = getenv("PROC_ROOT") ? : "/proc";
53 snprintf(store, sizeof(store)-1, "%s/%s", p, name);
56 return open(p, O_RDONLY);
59 static int net_rtacct_open(void)
61 return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
64 static __u32 rmap[256/4];
69 unsigned long long val[256*4];
74 static struct rtacct_data kern_db_static;
76 static struct rtacct_data *kern_db = &kern_db_static;
77 static struct rtacct_data *hist_db;
79 static void nread(int fd, char *buf, int tot)
84 int n = read(fd, buf+count, tot-count);
97 static __u32 *read_kern_table(__u32 *tbl)
99 static __u32 *tbl_ptr;
106 fd = open("/dev/mem", O_RDONLY);
108 perror("magic open");
111 tbl_ptr = mmap(NULL, 4096,
115 if ((unsigned long)tbl_ptr == ~0UL) {
116 perror("magic mmap");
123 fd = net_rtacct_open();
125 nread(fd, (char *)tbl, 256*16);
128 memset(tbl, 0, 256*16);
133 static void format_rate(FILE *fp, double rate)
137 if (rate > 1024*1024) {
138 sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
139 fprintf(fp, " %-10s", temp);
140 } else if (rate > 1024) {
141 sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
142 fprintf(fp, " %-10s", temp);
144 fprintf(fp, " %-10u", (unsigned int)rate);
147 static void format_count(FILE *fp, unsigned long long val)
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);
154 fprintf(fp, " %10llu", val);
157 static void dump_abs_db(FILE *fp)
163 fprintf(fp, "#%s\n", kern_db->signature);
168 , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
173 , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
177 for (realm = 0; realm < 256; realm++) {
179 unsigned long long *val;
182 if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
185 val = &kern_db->val[realm*4];
186 rate = &kern_db->rate[realm*4];
189 !val[0] && !rate[0] &&
190 !val[1] && !rate[1] &&
191 !val[2] && !rate[2] &&
196 memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
202 fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
203 for (i = 0; i < 4; i++)
204 format_count(fp, val[i]);
205 fprintf(fp, "\n%-10s", "");
206 for (i = 0; i < 4; i++)
207 format_rate(fp, rate[i]);
213 static void dump_incr_db(FILE *fp)
219 fprintf(fp, "#%s\n", kern_db->signature);
224 , "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
229 , "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
232 for (realm = 0; realm < 256; realm++) {
235 unsigned long long *val;
237 unsigned long long rval[4];
239 if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
242 val = &kern_db->val[realm*4];
243 rate = &kern_db->rate[realm*4];
245 for (k = 0; k < 4; k++) {
247 if (rval[k] < hist_db->val[realm*4+k])
250 rval[k] -= hist_db->val[realm*4+k];
253 for (k = 0; k < 4; k++)
257 memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
264 !rval[0] && !rate[0] &&
265 !rval[1] && !rate[1] &&
266 !rval[2] && !rate[2] &&
267 !rval[3] && !rate[3])
271 fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
272 for (i = 0; i < 4; i++)
273 format_count(fp, rval[i]);
274 fprintf(fp, "\n%-10s", "");
275 for (i = 0; i < 4; i++)
276 format_rate(fp, rate[i]);
284 static void sigchild(int signo)
288 /* Server side only: read kernel data, update tables, calculate rates. */
290 static void update_db(int interval)
296 ival = read_kern_table(_ival);
298 for (i = 0; i < 256*4; i++) {
300 __u32 incr = ival[i] - kern_db->ival[i];
302 if (ival[i] == 0 && incr == 0 &&
303 kern_db->val[i] == 0 && kern_db->rate[i] == 0)
306 kern_db->val[i] += incr;
307 kern_db->ival[i] = ival[i];
308 sample = (double)(incr*1000)/interval;
309 if (interval >= scan_interval) {
310 kern_db->rate[i] += W*(sample-kern_db->rate[i]);
311 } else if (interval >= 1000) {
312 if (interval >= time_constant) {
313 kern_db->rate[i] = sample;
315 double w = W*(double)interval/scan_interval;
317 kern_db->rate[i] += w*(sample-kern_db->rate[i]);
323 static void send_db(int fd)
327 while (tot < sizeof(*kern_db)) {
328 int n = write(fd, ((char *)kern_db) + tot, sizeof(*kern_db)-tot);
341 #define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
344 static void pad_kern_table(struct rtacct_data *dat, __u32 *ival)
348 memset(dat->rate, 0, sizeof(dat->rate));
349 if (dat->ival != ival)
350 memcpy(dat->ival, ival, sizeof(dat->ival));
351 for (i = 0; i < 256*4; i++)
352 dat->val[i] = ival[i];
355 static void server_loop(int fd)
357 struct timeval snaptime = { 0 };
361 p.events = p.revents = POLLIN;
363 sprintf(kern_db->signature,
364 "%u.%lu sampling_interval=%d time_const=%d",
365 (unsigned int) getpid(), (unsigned long)random(),
366 scan_interval/1000, time_constant/1000);
368 pad_kern_table(kern_db, read_kern_table(kern_db->ival));
375 gettimeofday(&now, NULL);
376 tdiff = T_DIFF(now, snaptime);
377 if (tdiff >= scan_interval) {
382 if (poll(&p, 1, tdiff + scan_interval) > 0
383 && (p.revents&POLLIN)) {
384 int clnt = accept(fd, NULL, NULL);
391 } else if ((pid = fork()) != 0) {
403 while (children && waitpid(-1, &status, WNOHANG) > 0)
408 static int verify_forging(int fd)
411 socklen_t olen = sizeof(cred);
413 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
416 if (cred.uid == getuid() || cred.uid == 0)
421 static void usage(void) __attribute__((noreturn));
423 static void usage(void)
426 "Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
431 int main(int argc, char *argv[])
434 struct sockaddr_un sun;
438 while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
456 scan_interval = 1000*atoi(optarg);
459 if (sscanf(optarg, "%d", &time_constant) != 1 ||
460 time_constant <= 0) {
461 fprintf(stderr, "rtacct: invalid time constant divisor\n");
467 printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT);
470 /* Some secret undocumented option, nobody
471 * is expected to ask about its sense. See?
473 sscanf(optarg, "%lx", &magic_number);
489 if (rtnl_rtrealm_a2n(&realm, argv[0])) {
490 fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
493 rmap[realm>>5] |= (1<<(realm&0x1f));
497 memset(rmap, ~0, sizeof(rmap));
498 /* Always suppress zeros. */
502 sun.sun_family = AF_UNIX;
504 sprintf(sun.sun_path+1, "rtacct%d", getuid());
506 if (scan_interval > 0) {
507 if (time_constant == 0)
509 time_constant *= 1000;
510 W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
511 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
512 perror("rtacct: socket");
515 if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
516 perror("rtacct: bind");
519 if (listen(fd, 5) < 0) {
520 perror("rtacct: listen");
524 perror("rtacct: daemon");
527 signal(SIGPIPE, SIG_IGN);
528 signal(SIGCHLD, sigchild);
533 if (getenv("RTACCT_HISTORY"))
534 snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
536 sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
541 if (!ignore_history || !no_update) {
544 fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
546 perror("rtacct: open history file");
549 if (flock(fd, LOCK_EX)) {
550 perror("rtacct: flock history file");
553 if (fstat(fd, &stb) != 0) {
554 perror("rtacct: fstat history file");
557 if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
558 fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
561 if (stb.st_size != sizeof(*hist_db))
562 if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
563 perror("rtacct: write history file");
567 hist_db = mmap(NULL, sizeof(*hist_db),
568 PROT_READ|PROT_WRITE,
569 no_update ? MAP_PRIVATE : MAP_SHARED,
572 if ((unsigned long)hist_db == ~0UL) {
577 if (!ignore_history) {
581 if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
582 if (fscanf(tfp, "%ld", &uptime) != 1)
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));
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");
612 if (hist_db && hist_db->signature[0] &&
613 strcmp(hist_db->signature, "kernel")) {
614 fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
618 pad_kern_table(kern_db, read_kern_table(kern_db->ival));
619 strcpy(kern_db->signature, "kernel");
622 if (ignore_history || hist_db == NULL)
625 dump_incr_db(stdout);