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