629 lines
13 KiB
C
629 lines
13 KiB
C
/*
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* rtacct.c Applet to display contents of /proc/net/rt_acct.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/time.h>
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#include <fnmatch.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/poll.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <signal.h>
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#include <math.h>
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#include "rt_names.h"
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#include <SNAPSHOT.h>
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int reset_history;
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int ignore_history;
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int no_output;
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int no_update;
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int scan_interval;
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int time_constant;
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int dump_zeros;
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unsigned long magic_number;
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double W;
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static int generic_proc_open(const char *env, const char *name)
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{
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char store[1024];
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char *p = getenv(env);
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if (!p) {
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p = getenv("PROC_ROOT") ? : "/proc";
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snprintf(store, sizeof(store)-1, "%s/%s", p, name);
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p = store;
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}
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return open(p, O_RDONLY);
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}
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static int net_rtacct_open(void)
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{
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return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
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}
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static __u32 rmap[256/4];
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struct rtacct_data {
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__u32 ival[256*4];
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unsigned long long val[256*4];
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double rate[256*4];
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char signature[128];
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};
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static struct rtacct_data kern_db_static;
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static struct rtacct_data *kern_db = &kern_db_static;
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static struct rtacct_data *hist_db;
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static void nread(int fd, char *buf, int tot)
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{
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int count = 0;
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while (count < tot) {
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int n = read(fd, buf+count, tot-count);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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exit(-1);
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}
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if (n == 0)
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exit(-1);
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count += n;
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}
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}
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static __u32 *read_kern_table(__u32 *tbl)
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{
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static __u32 *tbl_ptr;
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int fd;
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if (magic_number) {
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if (tbl_ptr != NULL)
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return tbl_ptr;
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fd = open("/dev/mem", O_RDONLY);
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if (fd < 0) {
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perror("magic open");
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exit(-1);
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}
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tbl_ptr = mmap(NULL, 4096,
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PROT_READ,
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MAP_SHARED,
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fd, magic_number);
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if ((unsigned long)tbl_ptr == ~0UL) {
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perror("magic mmap");
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exit(-1);
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}
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close(fd);
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return tbl_ptr;
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}
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fd = net_rtacct_open();
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if (fd >= 0) {
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nread(fd, (char *)tbl, 256*16);
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close(fd);
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} else {
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memset(tbl, 0, 256*16);
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}
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return tbl;
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}
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static void format_rate(FILE *fp, double rate)
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{
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char temp[64];
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if (rate > 1024*1024) {
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sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
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fprintf(fp, " %-10s", temp);
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} else if (rate > 1024) {
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sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
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fprintf(fp, " %-10s", temp);
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} else
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fprintf(fp, " %-10u", (unsigned int)rate);
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}
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static void format_count(FILE *fp, unsigned long long val)
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{
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if (val > 1024*1024*1024)
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fprintf(fp, " %10lluM", val/(1024*1024));
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else if (val > 1024*1024)
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fprintf(fp, " %10lluK", val/1024);
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else
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fprintf(fp, " %10llu", val);
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}
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static void dump_abs_db(FILE *fp)
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{
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int realm;
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char b1[16];
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if (!no_output) {
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fprintf(fp, "#%s\n", kern_db->signature);
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fprintf(fp,
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"%-10s %-10s "
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"%-10s %-10s "
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"%-10s \n"
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, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
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fprintf(fp,
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"%-10s %-10s "
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"%-10s %-10s "
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"%-10s \n"
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, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
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}
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for (realm = 0; realm < 256; realm++) {
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int i;
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unsigned long long *val;
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double *rate;
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if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
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continue;
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val = &kern_db->val[realm*4];
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rate = &kern_db->rate[realm*4];
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if (!dump_zeros &&
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!val[0] && !rate[0] &&
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!val[1] && !rate[1] &&
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!val[2] && !rate[2] &&
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!val[3] && !rate[3])
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continue;
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if (hist_db) {
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memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
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}
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if (no_output)
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continue;
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fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
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for (i = 0; i < 4; i++)
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format_count(fp, val[i]);
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fprintf(fp, "\n%-10s", "");
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for (i = 0; i < 4; i++)
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format_rate(fp, rate[i]);
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fprintf(fp, "\n");
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}
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}
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static void dump_incr_db(FILE *fp)
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{
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int k, realm;
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char b1[16];
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if (!no_output) {
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fprintf(fp, "#%s\n", kern_db->signature);
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fprintf(fp,
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"%-10s %-10s "
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"%-10s %-10s "
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"%-10s \n"
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, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
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fprintf(fp,
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"%-10s %-10s "
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"%-10s %-10s "
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"%-10s \n"
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, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
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}
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for (realm = 0; realm < 256; realm++) {
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int ovfl = 0;
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int i;
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unsigned long long *val;
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double *rate;
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unsigned long long rval[4];
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if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
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continue;
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val = &kern_db->val[realm*4];
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rate = &kern_db->rate[realm*4];
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for (k = 0; k < 4; k++) {
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rval[k] = val[k];
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if (rval[k] < hist_db->val[realm*4+k])
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ovfl = 1;
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else
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rval[k] -= hist_db->val[realm*4+k];
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}
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if (ovfl) {
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for (k = 0; k < 4; k++)
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rval[k] = val[k];
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}
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if (hist_db) {
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memcpy(&hist_db->val[realm*4], val, sizeof(*val)*4);
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}
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if (no_output)
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continue;
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if (!dump_zeros &&
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!rval[0] && !rate[0] &&
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!rval[1] && !rate[1] &&
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!rval[2] && !rate[2] &&
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!rval[3] && !rate[3])
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continue;
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fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
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for (i = 0; i < 4; i++)
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format_count(fp, rval[i]);
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fprintf(fp, "\n%-10s", "");
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for (i = 0; i < 4; i++)
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format_rate(fp, rate[i]);
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fprintf(fp, "\n");
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}
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}
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static int children;
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static void sigchild(int signo)
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{
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}
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/* Server side only: read kernel data, update tables, calculate rates. */
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static void update_db(int interval)
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{
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int i;
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__u32 *ival;
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__u32 _ival[256*4];
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ival = read_kern_table(_ival);
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for (i = 0; i < 256*4; i++) {
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double sample;
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__u32 incr = ival[i] - kern_db->ival[i];
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if (ival[i] == 0 && incr == 0 &&
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kern_db->val[i] == 0 && kern_db->rate[i] == 0)
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continue;
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kern_db->val[i] += incr;
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kern_db->ival[i] = ival[i];
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sample = (double)(incr*1000)/interval;
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if (interval >= scan_interval) {
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kern_db->rate[i] += W*(sample-kern_db->rate[i]);
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} else if (interval >= 1000) {
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if (interval >= time_constant) {
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kern_db->rate[i] = sample;
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} else {
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double w = W*(double)interval/scan_interval;
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kern_db->rate[i] += w*(sample-kern_db->rate[i]);
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}
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}
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}
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}
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static void send_db(int fd)
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{
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int tot = 0;
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while (tot < sizeof(*kern_db)) {
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int n = write(fd, ((char *)kern_db) + tot, sizeof(*kern_db)-tot);
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if (n < 0) {
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if (errno == EINTR)
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continue;
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return;
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}
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tot += n;
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}
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}
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#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
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static void pad_kern_table(struct rtacct_data *dat, __u32 *ival)
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{
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int i;
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memset(dat->rate, 0, sizeof(dat->rate));
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if (dat->ival != ival)
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memcpy(dat->ival, ival, sizeof(dat->ival));
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for (i = 0; i < 256*4; i++)
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dat->val[i] = ival[i];
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}
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static void server_loop(int fd)
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{
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struct timeval snaptime = { 0 };
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struct pollfd p;
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p.fd = fd;
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p.events = p.revents = POLLIN;
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sprintf(kern_db->signature,
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"%u.%lu sampling_interval=%d time_const=%d",
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(unsigned int) getpid(), (unsigned long)random(),
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scan_interval/1000, time_constant/1000);
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pad_kern_table(kern_db, read_kern_table(kern_db->ival));
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for (;;) {
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int status;
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int tdiff;
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struct timeval now;
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gettimeofday(&now, NULL);
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tdiff = T_DIFF(now, snaptime);
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if (tdiff >= scan_interval) {
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update_db(tdiff);
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snaptime = now;
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tdiff = 0;
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}
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if (poll(&p, 1, tdiff + scan_interval) > 0
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&& (p.revents&POLLIN)) {
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int clnt = accept(fd, NULL, NULL);
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if (clnt >= 0) {
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pid_t pid;
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if (children >= 5) {
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close(clnt);
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} else if ((pid = fork()) != 0) {
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if (pid > 0)
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children++;
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close(clnt);
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} else {
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if (tdiff > 0)
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update_db(tdiff);
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send_db(clnt);
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exit(0);
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}
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}
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}
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while (children && waitpid(-1, &status, WNOHANG) > 0)
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children--;
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}
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}
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static int verify_forging(int fd)
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{
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struct ucred cred;
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socklen_t olen = sizeof(cred);
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if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) ||
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olen < sizeof(cred))
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return -1;
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if (cred.uid == getuid() || cred.uid == 0)
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return 0;
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return -1;
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}
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
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);
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exit(-1);
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}
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int main(int argc, char *argv[])
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{
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char hist_name[128];
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struct sockaddr_un sun;
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int ch;
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int fd;
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while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
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switch (ch) {
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case 'z':
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dump_zeros = 1;
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break;
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case 'r':
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reset_history = 1;
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break;
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case 'a':
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ignore_history = 1;
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break;
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case 's':
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no_update = 1;
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break;
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case 'n':
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no_output = 1;
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break;
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case 'd':
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scan_interval = 1000*atoi(optarg);
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break;
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case 't':
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if (sscanf(optarg, "%d", &time_constant) != 1 ||
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time_constant <= 0) {
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fprintf(stderr, "rtacct: invalid time constant divisor\n");
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exit(-1);
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}
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break;
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case 'v':
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case 'V':
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printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT);
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exit(0);
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case 'M':
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/* Some secret undocumented option, nobody
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* is expected to ask about its sense. See?
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*/
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sscanf(optarg, "%lx", &magic_number);
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break;
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case 'h':
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case '?':
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default:
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usage();
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}
|
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}
|
|
|
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argc -= optind;
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argv += optind;
|
|
|
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if (argc) {
|
|
while (argc > 0) {
|
|
__u32 realm;
|
|
|
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if (rtnl_rtrealm_a2n(&realm, argv[0])) {
|
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fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
|
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exit(-1);
|
|
}
|
|
rmap[realm>>5] |= (1<<(realm&0x1f));
|
|
argc--; argv++;
|
|
}
|
|
} else {
|
|
memset(rmap, ~0, sizeof(rmap));
|
|
/* Always suppress zeros. */
|
|
dump_zeros = 0;
|
|
}
|
|
|
|
sun.sun_family = AF_UNIX;
|
|
sun.sun_path[0] = 0;
|
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sprintf(sun.sun_path+1, "rtacct%d", getuid());
|
|
|
|
if (scan_interval > 0) {
|
|
if (time_constant == 0)
|
|
time_constant = 60;
|
|
time_constant *= 1000;
|
|
W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
|
|
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
|
|
perror("rtacct: socket");
|
|
exit(-1);
|
|
}
|
|
if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
|
|
perror("rtacct: bind");
|
|
exit(-1);
|
|
}
|
|
if (listen(fd, 5) < 0) {
|
|
perror("rtacct: listen");
|
|
exit(-1);
|
|
}
|
|
if (daemon(0, 0)) {
|
|
perror("rtacct: daemon");
|
|
exit(-1);
|
|
}
|
|
signal(SIGPIPE, SIG_IGN);
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signal(SIGCHLD, sigchild);
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server_loop(fd);
|
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exit(0);
|
|
}
|
|
|
|
if (getenv("RTACCT_HISTORY"))
|
|
snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
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|
else
|
|
sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
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|
|
|
if (reset_history)
|
|
unlink(hist_name);
|
|
|
|
if (!ignore_history || !no_update) {
|
|
struct stat stb;
|
|
|
|
fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
|
|
if (fd < 0) {
|
|
perror("rtacct: open history file");
|
|
exit(-1);
|
|
}
|
|
if (flock(fd, LOCK_EX)) {
|
|
perror("rtacct: flock history file");
|
|
exit(-1);
|
|
}
|
|
if (fstat(fd, &stb) != 0) {
|
|
perror("rtacct: fstat history file");
|
|
exit(-1);
|
|
}
|
|
if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
|
|
fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
|
|
exit(-1);
|
|
}
|
|
if (stb.st_size != sizeof(*hist_db))
|
|
if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
|
|
perror("rtacct: write history file");
|
|
exit(-1);
|
|
}
|
|
|
|
hist_db = mmap(NULL, sizeof(*hist_db),
|
|
PROT_READ|PROT_WRITE,
|
|
no_update ? MAP_PRIVATE : MAP_SHARED,
|
|
fd, 0);
|
|
|
|
if ((unsigned long)hist_db == ~0UL) {
|
|
perror("mmap");
|
|
exit(-1);
|
|
}
|
|
|
|
if (!ignore_history) {
|
|
FILE *tfp;
|
|
long uptime = -1;
|
|
|
|
if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
|
|
if (fscanf(tfp, "%ld", &uptime) != 1)
|
|
uptime = -1;
|
|
fclose(tfp);
|
|
}
|
|
|
|
if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
|
|
fprintf(stderr, "rtacct: history is aged out, resetting\n");
|
|
memset(hist_db, 0, sizeof(*hist_db));
|
|
}
|
|
}
|
|
|
|
close(fd);
|
|
}
|
|
|
|
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
|
|
(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
|
|
|| (strcpy(sun.sun_path+1, "rtacct0"),
|
|
connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
|
|
&& verify_forging(fd) == 0) {
|
|
nread(fd, (char *)kern_db, sizeof(*kern_db));
|
|
if (hist_db && hist_db->signature[0] &&
|
|
strcmp(kern_db->signature, hist_db->signature)) {
|
|
fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
|
|
hist_db = NULL;
|
|
}
|
|
close(fd);
|
|
} else {
|
|
if (fd >= 0)
|
|
close(fd);
|
|
|
|
if (hist_db && hist_db->signature[0] &&
|
|
strcmp(hist_db->signature, "kernel")) {
|
|
fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
|
|
hist_db = NULL;
|
|
}
|
|
|
|
pad_kern_table(kern_db, read_kern_table(kern_db->ival));
|
|
strcpy(kern_db->signature, "kernel");
|
|
}
|
|
|
|
if (ignore_history || hist_db == NULL)
|
|
dump_abs_db(stdout);
|
|
else
|
|
dump_incr_db(stdout);
|
|
|
|
exit(0);
|
|
}
|