[mirror_iproute2.git] / misc / rtacct.c

/*
 * 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;
int ignore_history;
int no_output;
int no_update;
int scan_interval;
int time_constant;
int dump_zeros;
unsigned long magic_number;
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);
}

static int net_rtacct_open(void)
{
	return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
}

static __u32 rmap[256/4];

struct rtacct_data {
	__u32			ival[256*4];

	unsigned long long	val[256*4];
	double			rate[256*4];
	char			signature[128];
};

static struct rtacct_data kern_db_static;

static struct rtacct_data *kern_db = &kern_db_static;
static struct rtacct_data *hist_db;

static 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;
	}
}

static __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;
}

static void format_rate(FILE *fp, double rate)
{
	char temp[64];

	if (rate > 1024*1024) {
		sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
		fprintf(fp, " %-10s", temp);
	} else if (rate > 1024) {
		sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
		fprintf(fp, " %-10s", temp);
	} else
		fprintf(fp, " %-10u", (unsigned int)rate);
}

static 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);
}

static 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");
	}
}


static 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;

static void sigchild(int signo)
{
}

/* Server side only: read kernel data, update tables, calculate rates. */

static 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]);
			}
		}
	}
}

static 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)


static 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];
}

static 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 int) 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--;
	}
}

static 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), "%s", 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))
			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);
}
Commit	Line	Data
aba5acdf SH	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
acd1e437 SH	36	int reset_history;
	37	int ignore_history;
	38	int no_output;
	39	int no_update;
	40	int scan_interval;
	41	int time_constant;
	42	int dump_zeros;
	43	unsigned long magic_number;
aba5acdf SH	44	double W;
aba5acdf SH	45
4ffc44ca	46	static int generic_proc_open(const char env, const char name)
aba5acdf SH	47	{
	48	char store[1024];
	49	char *p = getenv(env);
acd1e437	50
aba5acdf SH	51	if (!p) {
	52	p = getenv("PROC_ROOT") ? : "/proc";
	53	snprintf(store, sizeof(store)-1, "%s/%s", p, name);
	54	p = store;
	55	}
4ffc44ca	56	return open(p, O_RDONLY);
aba5acdf SH	57	}
aba5acdf SH	58
d1f28cf1	59	static int net_rtacct_open(void)
aba5acdf SH	60	{
	61	return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
	62	}
	63
d1f28cf1	64	static __u32 rmap[256/4];
aba5acdf	65
acd1e437	66	struct rtacct_data {
aba5acdf SH	67	__u32 ival[256*4];
	68
	69	unsigned long long val[256*4];
	70	double rate[256*4];
737f15f6	71	char signature[128];
aba5acdf SH	72	};
aba5acdf SH	73
d1f28cf1	74	static struct rtacct_data kern_db_static;
aba5acdf	75
d1f28cf1 SH	76	static struct rtacct_data *kern_db = &kern_db_static;
d1f28cf1 SH	77	static struct rtacct_data *hist_db;
aba5acdf	78
d1f28cf1	79	static void nread(int fd, char *buf, int tot)
aba5acdf SH	80	{
	81	int count = 0;
	82
	83	while (count < tot) {
	84	int n = read(fd, buf+count, tot-count);
acd1e437	85
aba5acdf SH	86	if (n < 0) {
	87	if (errno == EINTR)
	88	continue;
	89	exit(-1);
	90	}
	91	if (n == 0)
	92	exit(-1);
	93	count += n;
	94	}
	95	}
	96
d1f28cf1	97	static __u32 read_kern_table(__u32 tbl)
aba5acdf SH	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) {
acd1e437	125	nread(fd, (char )tbl, 25616);
aba5acdf SH	126	close(fd);
	127	} else {
	128	memset(tbl, 0, 256*16);
	129	}
	130	return tbl;
	131	}
	132
d1f28cf1	133	static void format_rate(FILE *fp, double rate)
aba5acdf SH	134	{
	135	char temp[64];
	136
	137	if (rate > 1024*1024) {
acd1e437	138	sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
aba5acdf SH	139	fprintf(fp, " %-10s", temp);
aba5acdf SH	140	} else if (rate > 1024) {
acd1e437	141	sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
aba5acdf SH	142	fprintf(fp, " %-10s", temp);
aba5acdf SH	143	} else
acd1e437	144	fprintf(fp, " %-10u", (unsigned int)rate);
aba5acdf SH	145	}
aba5acdf SH	146
d1f28cf1	147	static void format_count(FILE *fp, unsigned long long val)
aba5acdf SH	148	{
	149	if (val > 102410241024)
	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
d1f28cf1	157	static void dump_abs_db(FILE *fp)
aba5acdf SH	158	{
	159	int realm;
	160	char b1[16];
	161
	162	if (!no_output) {
	163	fprintf(fp, "#%s\n", kern_db->signature);
	164	fprintf(fp,
acd1e437 SH	165	"%-10s %-10s "
	166	"%-10s %-10s "
	167	"%-10s \n"
ae665a52	168	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf	169	fprintf(fp,
acd1e437 SH	170	"%-10s %-10s "
	171	"%-10s %-10s "
	172	"%-10s \n"
ae665a52	173	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	174
	175	}
	176
acd1e437	177	for (realm = 0; realm < 256; realm++) {
aba5acdf SH	178	int i;
	179	unsigned long long *val;
	180	double *rate;
	181
	182	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	183	continue;
	184
	185	val = &kern_db->val[realm*4];
	186	rate = &kern_db->rate[realm*4];
	187
	188	if (!dump_zeros &&
	189	!val[0] && !rate[0] &&
	190	!val[1] && !rate[1] &&
	191	!val[2] && !rate[2] &&
	192	!val[3] && !rate[3])
	193	continue;
	194
	195	if (hist_db) {
	196	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	197	}
	198
	199	if (no_output)
	200	continue;
	201
	202	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	203	for (i = 0; i < 4; i++)
ae665a52	204	format_count(fp, val[i]);
aba5acdf SH	205	fprintf(fp, "\n%-10s", "");
aba5acdf SH	206	for (i = 0; i < 4; i++)
ae665a52	207	format_rate(fp, rate[i]);
aba5acdf SH	208	fprintf(fp, "\n");
	209	}
	210	}
	211
	212
d1f28cf1	213	static void dump_incr_db(FILE *fp)
aba5acdf SH	214	{
	215	int k, realm;
	216	char b1[16];
	217
	218	if (!no_output) {
	219	fprintf(fp, "#%s\n", kern_db->signature);
	220	fprintf(fp,
acd1e437 SH	221	"%-10s %-10s "
	222	"%-10s %-10s "
	223	"%-10s \n"
ae665a52	224	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf	225	fprintf(fp,
acd1e437 SH	226	"%-10s %-10s "
	227	"%-10s %-10s "
	228	"%-10s \n"
ae665a52	229	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	230	}
aba5acdf SH	231
acd1e437	232	for (realm = 0; realm < 256; realm++) {
aba5acdf SH	233	int ovfl = 0;
	234	int i;
	235	unsigned long long *val;
	236	double *rate;
	237	unsigned long long rval[4];
	238
	239	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	240	continue;
	241
	242	val = &kern_db->val[realm*4];
	243	rate = &kern_db->rate[realm*4];
	244
acd1e437	245	for (k = 0; k < 4; k++) {
aba5acdf SH	246	rval[k] = val[k];
	247	if (rval[k] < hist_db->val[realm*4+k])
	248	ovfl = 1;
	249	else
	250	rval[k] -= hist_db->val[realm*4+k];
	251	}
	252	if (ovfl) {
acd1e437	253	for (k = 0; k < 4; k++)
aba5acdf SH	254	rval[k] = val[k];
	255	}
	256	if (hist_db) {
	257	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	258	}
	259
	260	if (no_output)
	261	continue;
	262
	263	if (!dump_zeros &&
	264	!rval[0] && !rate[0] &&
	265	!rval[1] && !rate[1] &&
	266	!rval[2] && !rate[2] &&
	267	!rval[3] && !rate[3])
	268	continue;
	269
	270
	271	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	272	for (i = 0; i < 4; i++)
ae665a52	273	format_count(fp, rval[i]);
aba5acdf SH	274	fprintf(fp, "\n%-10s", "");
aba5acdf SH	275	for (i = 0; i < 4; i++)
ae665a52	276	format_rate(fp, rate[i]);
aba5acdf SH	277	fprintf(fp, "\n");
	278	}
	279	}
	280
	281
	282	static int children;
	283
d1f28cf1	284	static void sigchild(int signo)
aba5acdf SH	285	{
	286	}
	287
ae665a52	288	/* Server side only: read kernel data, update tables, calculate rates. */
aba5acdf	289
d1f28cf1	290	static void update_db(int interval)
aba5acdf SH	291	{
	292	int i;
	293	__u32 *ival;
	294	__u32 _ival[256*4];
	295
	296	ival = read_kern_table(_ival);
	297
acd1e437	298	for (i = 0; i < 256*4; i++) {
aba5acdf SH	299	double sample;
	300	__u32 incr = ival[i] - kern_db->ival[i];
	301
	302	if (ival[i] == 0 && incr == 0 &&
	303	kern_db->val[i] == 0 && kern_db->rate[i] == 0)
	304	continue;
	305
	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;
	314	} else {
	315	double w = W*(double)interval/scan_interval;
acd1e437	316
aba5acdf SH	317	kern_db->rate[i] += w*(sample-kern_db->rate[i]);
	318	}
	319	}
	320	}
	321	}
	322
d1f28cf1	323	static void send_db(int fd)
aba5acdf SH	324	{
	325	int tot = 0;
	326
	327	while (tot < sizeof(*kern_db)) {
acd1e437 SH	328	int n = write(fd, ((char )kern_db) + tot, sizeof(kern_db)-tot);
acd1e437 SH	329
aba5acdf SH	330	if (n < 0) {
	331	if (errno == EINTR)
	332	continue;
	333	return;
	334	}
	335	tot += n;
	336	}
	337	}
	338
	339
	340
acd1e437	341	#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
aba5acdf SH	342
aba5acdf SH	343
d1f28cf1	344	static void pad_kern_table(struct rtacct_data dat, __u32 ival)
aba5acdf SH	345	{
aba5acdf SH	346	int i;
acd1e437	347
aba5acdf SH	348	memset(dat->rate, 0, sizeof(dat->rate));
	349	if (dat->ival != ival)
	350	memcpy(dat->ival, ival, sizeof(dat->ival));
acd1e437	351	for (i = 0; i < 256*4; i++)
aba5acdf SH	352	dat->val[i] = ival[i];
	353	}
	354
d1f28cf1	355	static void server_loop(int fd)
aba5acdf	356	{
737f15f6	357	struct timeval snaptime = { 0 };
aba5acdf	358	struct pollfd p;
acd1e437	359
aba5acdf SH	360	p.fd = fd;
	361	p.events = p.revents = POLLIN;
	362
ae665a52	363	sprintf(kern_db->signature,
737f15f6	364	"%u.%lu sampling_interval=%d time_const=%d",
acd1e437	365	(unsigned int) getpid(), (unsigned long)random(),
737f15f6	366	scan_interval/1000, time_constant/1000);
aba5acdf SH	367
	368	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	369
	370	for (;;) {
	371	int status;
	372	int tdiff;
	373	struct timeval now;
acd1e437	374
aba5acdf SH	375	gettimeofday(&now, NULL);
	376	tdiff = T_DIFF(now, snaptime);
	377	if (tdiff >= scan_interval) {
	378	update_db(tdiff);
	379	snaptime = now;
	380	tdiff = 0;
	381	}
	382	if (poll(&p, 1, tdiff + scan_interval) > 0
	383	&& (p.revents&POLLIN)) {
	384	int clnt = accept(fd, NULL, NULL);
acd1e437	385
aba5acdf SH	386	if (clnt >= 0) {
aba5acdf SH	387	pid_t pid;
acd1e437	388
aba5acdf SH	389	if (children >= 5) {
	390	close(clnt);
	391	} else if ((pid = fork()) != 0) {
acd1e437	392	if (pid > 0)
aba5acdf SH	393	children++;
	394	close(clnt);
	395	} else {
	396	if (tdiff > 0)
	397	update_db(tdiff);
	398	send_db(clnt);
	399	exit(0);
	400	}
	401	}
	402	}
	403	while (children && waitpid(-1, &status, WNOHANG) > 0)
	404	children--;
	405	}
	406	}
	407
d1f28cf1	408	static int verify_forging(int fd)
aba5acdf SH	409	{
aba5acdf SH	410	struct ucred cred;
737f15f6 SH	411	socklen_t olen = sizeof(cred);
737f15f6 SH	412
acd1e437	413	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) \|\|
aba5acdf SH	414	olen < sizeof(cred))
	415	return -1;
	416	if (cred.uid == getuid() \|\| cred.uid == 0)
	417	return 0;
	418	return -1;
	419	}
	420
	421	static void usage(void) __attribute__((noreturn));
	422
	423	static void usage(void)
	424	{
	425	fprintf(stderr,
	426	"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
	427	);
	428	exit(-1);
	429	}
	430
	431	int main(int argc, char *argv[])
	432	{
	433	char hist_name[128];
	434	struct sockaddr_un sun;
	435	int ch;
	436	int fd;
	437
	438	while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
acd1e437	439	switch (ch) {
aba5acdf SH	440	case 'z':
	441	dump_zeros = 1;
	442	break;
	443	case 'r':
	444	reset_history = 1;
	445	break;
	446	case 'a':
	447	ignore_history = 1;
	448	break;
	449	case 's':
	450	no_update = 1;
	451	break;
	452	case 'n':
	453	no_output = 1;
	454	break;
	455	case 'd':
	456	scan_interval = 1000*atoi(optarg);
	457	break;
	458	case 't':
	459	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	460	time_constant <= 0) {
	461	fprintf(stderr, "rtacct: invalid time constant divisor\n");
	462	exit(-1);
	463	}
	464	break;
	465	case 'v':
	466	case 'V':
	467	printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT);
	468	exit(0);
	469	case 'M':
	470	/* Some secret undocumented option, nobody
	471	* is expected to ask about its sense. See?
	472	*/
	473	sscanf(optarg, "%lx", &magic_number);
	474	break;
	475	case 'h':
	476	case '?':
	477	default:
	478	usage();
	479	}
	480	}
	481
	482	argc -= optind;
	483	argv += optind;
	484
	485	if (argc) {
	486	while (argc > 0) {
	487	__u32 realm;
acd1e437	488
aba5acdf SH	489	if (rtnl_rtrealm_a2n(&realm, argv[0])) {
	490	fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
	491	exit(-1);
	492	}
	493	rmap[realm>>5] \|= (1<<(realm&0x1f));
	494	argc--; argv++;
	495	}
	496	} else {
	497	memset(rmap, ~0, sizeof(rmap));
	498	/* Always suppress zeros. */
	499	dump_zeros = 0;
	500	}
	501
	502	sun.sun_family = AF_UNIX;
	503	sun.sun_path[0] = 0;
	504	sprintf(sun.sun_path+1, "rtacct%d", getuid());
	505
	506	if (scan_interval > 0) {
	507	if (time_constant == 0)
	508	time_constant = 60;
	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");
	513	exit(-1);
	514	}
acd1e437	515	if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
aba5acdf SH	516	perror("rtacct: bind");
	517	exit(-1);
	518	}
	519	if (listen(fd, 5) < 0) {
	520	perror("rtacct: listen");
	521	exit(-1);
	522	}
a7a9ddbb MF	523	if (daemon(0, 0)) {
	524	perror("rtacct: daemon");
	525	exit(-1);
	526	}
aba5acdf SH	527	signal(SIGPIPE, SIG_IGN);
	528	signal(SIGCHLD, sigchild);
	529	server_loop(fd);
	530	exit(0);
	531	}
	532
	533	if (getenv("RTACCT_HISTORY"))
8988b02e	534	snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
aba5acdf SH	535	else
	536	sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
	537
	538	if (reset_history)
	539	unlink(hist_name);
	540
	541	if (!ignore_history \|\| !no_update) {
	542	struct stat stb;
	543
	544	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	545	if (fd < 0) {
	546	perror("rtacct: open history file");
	547	exit(-1);
	548	}
	549	if (flock(fd, LOCK_EX)) {
	550	perror("rtacct: flock history file");
	551	exit(-1);
	552	}
	553	if (fstat(fd, &stb) != 0) {
	554	perror("rtacct: fstat history file");
	555	exit(-1);
	556	}
	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");
	559	exit(-1);
	560	}
	561	if (stb.st_size != sizeof(*hist_db))
8988b02e SH	562	if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
	563	perror("rtacct: write history file");
	564	exit(-1);
	565	}
aba5acdf SH	566
	567	hist_db = mmap(NULL, sizeof(*hist_db),
	568	PROT_READ\|PROT_WRITE,
	569	no_update ? MAP_PRIVATE : MAP_SHARED,
	570	fd, 0);
	571
	572	if ((unsigned long)hist_db == ~0UL) {
	573	perror("mmap");
	574	exit(-1);
	575	}
	576
	577	if (!ignore_history) {
	578	FILE *tfp;
9a230771	579	long uptime = -1;
acd1e437	580
aba5acdf SH	581	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	582	if (fscanf(tfp, "%ld", &uptime) != 1)
	583	uptime = -1;
	584	fclose(tfp);
	585	}
	586
	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));
	590	}
	591	}
	592
	593	close(fd);
	594	}
	595
	596	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
acd1e437	597	(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
aba5acdf	598	\|\| (strcpy(sun.sun_path+1, "rtacct0"),
acd1e437	599	connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
aba5acdf	600	&& verify_forging(fd) == 0) {
acd1e437	601	nread(fd, (char )kern_db, sizeof(kern_db));
aba5acdf SH	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");
	605	hist_db = NULL;
	606	}
	607	close(fd);
	608	} else {
	609	if (fd >= 0)
	610	close(fd);
	611
	612	if (hist_db && hist_db->signature[0] &&
	613	strcmp(hist_db->signature, "kernel")) {
	614	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	615	hist_db = NULL;
	616	}
	617
	618	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	619	strcpy(kern_db->signature, "kernel");
	620	}
	621
	622	if (ignore_history \|\| hist_db == NULL)
	623	dump_abs_db(stdout);
	624	else
	625	dump_incr_db(stdout);
	626
	627	exit(0);
	628	}