[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 <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 "version.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-%s\n", version);
			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>
aba5acdf SH	21	#include <sys/file.h>
	22	#include <sys/socket.h>
	23	#include <sys/un.h>
	24	#include <sys/poll.h>
	25	#include <sys/wait.h>
	26	#include <sys/stat.h>
	27	#include <sys/mman.h>
	28	#include <signal.h>
	29	#include <math.h>
	30
	31	#include "rt_names.h"
	32
fbef6555	33	#include "version.h"
aba5acdf	34
acd1e437 SH	35	int reset_history;
	36	int ignore_history;
	37	int no_output;
	38	int no_update;
	39	int scan_interval;
	40	int time_constant;
	41	int dump_zeros;
	42	unsigned long magic_number;
aba5acdf SH	43	double W;
aba5acdf SH	44
4ffc44ca	45	static int generic_proc_open(const char env, const char name)
aba5acdf SH	46	{
	47	char store[1024];
	48	char *p = getenv(env);
acd1e437	49
aba5acdf SH	50	if (!p) {
	51	p = getenv("PROC_ROOT") ? : "/proc";
	52	snprintf(store, sizeof(store)-1, "%s/%s", p, name);
	53	p = store;
	54	}
4ffc44ca	55	return open(p, O_RDONLY);
aba5acdf SH	56	}
aba5acdf SH	57
d1f28cf1	58	static int net_rtacct_open(void)
aba5acdf SH	59	{
	60	return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
	61	}
	62
d1f28cf1	63	static __u32 rmap[256/4];
aba5acdf	64
acd1e437	65	struct rtacct_data {
aba5acdf SH	66	__u32 ival[256*4];
	67
	68	unsigned long long val[256*4];
	69	double rate[256*4];
737f15f6	70	char signature[128];
aba5acdf SH	71	};
aba5acdf SH	72
d1f28cf1	73	static struct rtacct_data kern_db_static;
aba5acdf	74
d1f28cf1 SH	75	static struct rtacct_data *kern_db = &kern_db_static;
d1f28cf1 SH	76	static struct rtacct_data *hist_db;
aba5acdf	77
d1f28cf1	78	static void nread(int fd, char *buf, int tot)
aba5acdf SH	79	{
	80	int count = 0;
	81
	82	while (count < tot) {
	83	int n = read(fd, buf+count, tot-count);
acd1e437	84
aba5acdf SH	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
d1f28cf1	96	static __u32 read_kern_table(__u32 tbl)
aba5acdf SH	97	{
	98	static __u32 *tbl_ptr;
	99	int fd;
	100
	101	if (magic_number) {
	102	if (tbl_ptr != NULL)
	103	return tbl_ptr;
	104
	105	fd = open("/dev/mem", O_RDONLY);
	106	if (fd < 0) {
	107	perror("magic open");
	108	exit(-1);
	109	}
	110	tbl_ptr = mmap(NULL, 4096,
	111	PROT_READ,
	112	MAP_SHARED,
	113	fd, magic_number);
	114	if ((unsigned long)tbl_ptr == ~0UL) {
	115	perror("magic mmap");
	116	exit(-1);
	117	}
	118	close(fd);
	119	return tbl_ptr;
	120	}
	121
	122	fd = net_rtacct_open();
	123	if (fd >= 0) {
acd1e437	124	nread(fd, (char )tbl, 25616);
aba5acdf SH	125	close(fd);
	126	} else {
	127	memset(tbl, 0, 256*16);
	128	}
	129	return tbl;
	130	}
	131
d1f28cf1	132	static void format_rate(FILE *fp, double rate)
aba5acdf SH	133	{
	134	char temp[64];
	135
	136	if (rate > 1024*1024) {
acd1e437	137	sprintf(temp, "%uM", (unsigned int)rint(rate/(1024*1024)));
aba5acdf SH	138	fprintf(fp, " %-10s", temp);
aba5acdf SH	139	} else if (rate > 1024) {
acd1e437	140	sprintf(temp, "%uK", (unsigned int)rint(rate/1024));
aba5acdf SH	141	fprintf(fp, " %-10s", temp);
aba5acdf SH	142	} else
acd1e437	143	fprintf(fp, " %-10u", (unsigned int)rate);
aba5acdf SH	144	}
aba5acdf SH	145
d1f28cf1	146	static void format_count(FILE *fp, unsigned long long val)
aba5acdf SH	147	{
	148	if (val > 102410241024)
	149	fprintf(fp, " %10lluM", val/(1024*1024));
	150	else if (val > 1024*1024)
	151	fprintf(fp, " %10lluK", val/1024);
	152	else
	153	fprintf(fp, " %10llu", val);
	154	}
	155
d1f28cf1	156	static void dump_abs_db(FILE *fp)
aba5acdf SH	157	{
	158	int realm;
	159	char b1[16];
	160
	161	if (!no_output) {
	162	fprintf(fp, "#%s\n", kern_db->signature);
	163	fprintf(fp,
acd1e437 SH	164	"%-10s %-10s "
	165	"%-10s %-10s "
	166	"%-10s \n"
ae665a52	167	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf	168	fprintf(fp,
acd1e437 SH	169	"%-10s %-10s "
	170	"%-10s %-10s "
	171	"%-10s \n"
ae665a52	172	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	173
	174	}
	175
acd1e437	176	for (realm = 0; realm < 256; realm++) {
aba5acdf SH	177	int i;
	178	unsigned long long *val;
	179	double *rate;
	180
	181	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	182	continue;
	183
	184	val = &kern_db->val[realm*4];
	185	rate = &kern_db->rate[realm*4];
	186
	187	if (!dump_zeros &&
	188	!val[0] && !rate[0] &&
	189	!val[1] && !rate[1] &&
	190	!val[2] && !rate[2] &&
	191	!val[3] && !rate[3])
	192	continue;
	193
	194	if (hist_db) {
	195	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	196	}
	197
	198	if (no_output)
	199	continue;
	200
	201	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	202	for (i = 0; i < 4; i++)
ae665a52	203	format_count(fp, val[i]);
aba5acdf SH	204	fprintf(fp, "\n%-10s", "");
aba5acdf SH	205	for (i = 0; i < 4; i++)
ae665a52	206	format_rate(fp, rate[i]);
aba5acdf SH	207	fprintf(fp, "\n");
	208	}
	209	}
	210
	211
d1f28cf1	212	static void dump_incr_db(FILE *fp)
aba5acdf SH	213	{
	214	int k, realm;
	215	char b1[16];
	216
	217	if (!no_output) {
	218	fprintf(fp, "#%s\n", kern_db->signature);
	219	fprintf(fp,
acd1e437 SH	220	"%-10s %-10s "
	221	"%-10s %-10s "
	222	"%-10s \n"
ae665a52	223	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf	224	fprintf(fp,
acd1e437 SH	225	"%-10s %-10s "
	226	"%-10s %-10s "
	227	"%-10s \n"
ae665a52	228	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	229	}
aba5acdf SH	230
acd1e437	231	for (realm = 0; realm < 256; realm++) {
aba5acdf SH	232	int ovfl = 0;
	233	int i;
	234	unsigned long long *val;
	235	double *rate;
	236	unsigned long long rval[4];
	237
	238	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	239	continue;
	240
	241	val = &kern_db->val[realm*4];
	242	rate = &kern_db->rate[realm*4];
	243
acd1e437	244	for (k = 0; k < 4; k++) {
aba5acdf SH	245	rval[k] = val[k];
	246	if (rval[k] < hist_db->val[realm*4+k])
	247	ovfl = 1;
	248	else
	249	rval[k] -= hist_db->val[realm*4+k];
	250	}
	251	if (ovfl) {
acd1e437	252	for (k = 0; k < 4; k++)
aba5acdf SH	253	rval[k] = val[k];
	254	}
	255	if (hist_db) {
	256	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	257	}
	258
	259	if (no_output)
	260	continue;
	261
	262	if (!dump_zeros &&
	263	!rval[0] && !rate[0] &&
	264	!rval[1] && !rate[1] &&
	265	!rval[2] && !rate[2] &&
	266	!rval[3] && !rate[3])
	267	continue;
	268
	269
	270	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	271	for (i = 0; i < 4; i++)
ae665a52	272	format_count(fp, rval[i]);
aba5acdf SH	273	fprintf(fp, "\n%-10s", "");
aba5acdf SH	274	for (i = 0; i < 4; i++)
ae665a52	275	format_rate(fp, rate[i]);
aba5acdf SH	276	fprintf(fp, "\n");
	277	}
	278	}
	279
	280
	281	static int children;
	282
d1f28cf1	283	static void sigchild(int signo)
aba5acdf SH	284	{
	285	}
	286
ae665a52	287	/* Server side only: read kernel data, update tables, calculate rates. */
aba5acdf	288
d1f28cf1	289	static void update_db(int interval)
aba5acdf SH	290	{
	291	int i;
	292	__u32 *ival;
	293	__u32 _ival[256*4];
	294
	295	ival = read_kern_table(_ival);
	296
acd1e437	297	for (i = 0; i < 256*4; i++) {
aba5acdf SH	298	double sample;
	299	__u32 incr = ival[i] - kern_db->ival[i];
	300
	301	if (ival[i] == 0 && incr == 0 &&
	302	kern_db->val[i] == 0 && kern_db->rate[i] == 0)
	303	continue;
	304
	305	kern_db->val[i] += incr;
	306	kern_db->ival[i] = ival[i];
	307	sample = (double)(incr*1000)/interval;
	308	if (interval >= scan_interval) {
	309	kern_db->rate[i] += W*(sample-kern_db->rate[i]);
	310	} else if (interval >= 1000) {
	311	if (interval >= time_constant) {
	312	kern_db->rate[i] = sample;
	313	} else {
	314	double w = W*(double)interval/scan_interval;
acd1e437	315
aba5acdf SH	316	kern_db->rate[i] += w*(sample-kern_db->rate[i]);
	317	}
	318	}
	319	}
	320	}
	321
d1f28cf1	322	static void send_db(int fd)
aba5acdf SH	323	{
	324	int tot = 0;
	325
	326	while (tot < sizeof(*kern_db)) {
acd1e437 SH	327	int n = write(fd, ((char )kern_db) + tot, sizeof(kern_db)-tot);
acd1e437 SH	328
aba5acdf SH	329	if (n < 0) {
	330	if (errno == EINTR)
	331	continue;
	332	return;
	333	}
	334	tot += n;
	335	}
	336	}
	337
	338
	339
acd1e437	340	#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
aba5acdf SH	341
aba5acdf SH	342
d1f28cf1	343	static void pad_kern_table(struct rtacct_data dat, __u32 ival)
aba5acdf SH	344	{
aba5acdf SH	345	int i;
acd1e437	346
aba5acdf SH	347	memset(dat->rate, 0, sizeof(dat->rate));
	348	if (dat->ival != ival)
	349	memcpy(dat->ival, ival, sizeof(dat->ival));
acd1e437	350	for (i = 0; i < 256*4; i++)
aba5acdf SH	351	dat->val[i] = ival[i];
	352	}
	353
d1f28cf1	354	static void server_loop(int fd)
aba5acdf	355	{
737f15f6	356	struct timeval snaptime = { 0 };
aba5acdf	357	struct pollfd p;
acd1e437	358
aba5acdf SH	359	p.fd = fd;
	360	p.events = p.revents = POLLIN;
	361
ae665a52	362	sprintf(kern_db->signature,
737f15f6	363	"%u.%lu sampling_interval=%d time_const=%d",
acd1e437	364	(unsigned int) getpid(), (unsigned long)random(),
737f15f6	365	scan_interval/1000, time_constant/1000);
aba5acdf SH	366
	367	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	368
	369	for (;;) {
	370	int status;
	371	int tdiff;
	372	struct timeval now;
acd1e437	373
aba5acdf SH	374	gettimeofday(&now, NULL);
	375	tdiff = T_DIFF(now, snaptime);
	376	if (tdiff >= scan_interval) {
	377	update_db(tdiff);
	378	snaptime = now;
	379	tdiff = 0;
	380	}
	381	if (poll(&p, 1, tdiff + scan_interval) > 0
	382	&& (p.revents&POLLIN)) {
	383	int clnt = accept(fd, NULL, NULL);
acd1e437	384
aba5acdf SH	385	if (clnt >= 0) {
aba5acdf SH	386	pid_t pid;
acd1e437	387
aba5acdf SH	388	if (children >= 5) {
	389	close(clnt);
	390	} else if ((pid = fork()) != 0) {
acd1e437	391	if (pid > 0)
aba5acdf SH	392	children++;
	393	close(clnt);
	394	} else {
	395	if (tdiff > 0)
	396	update_db(tdiff);
	397	send_db(clnt);
	398	exit(0);
	399	}
	400	}
	401	}
	402	while (children && waitpid(-1, &status, WNOHANG) > 0)
	403	children--;
	404	}
	405	}
	406
d1f28cf1	407	static int verify_forging(int fd)
aba5acdf SH	408	{
aba5acdf SH	409	struct ucred cred;
737f15f6 SH	410	socklen_t olen = sizeof(cred);
737f15f6 SH	411
acd1e437	412	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) \|\|
aba5acdf SH	413	olen < sizeof(cred))
	414	return -1;
	415	if (cred.uid == getuid() \|\| cred.uid == 0)
	416	return 0;
	417	return -1;
	418	}
	419
	420	static void usage(void) __attribute__((noreturn));
	421
	422	static void usage(void)
	423	{
	424	fprintf(stderr,
	425	"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
	426	);
	427	exit(-1);
	428	}
	429
	430	int main(int argc, char *argv[])
	431	{
	432	char hist_name[128];
	433	struct sockaddr_un sun;
	434	int ch;
	435	int fd;
	436
	437	while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
acd1e437	438	switch (ch) {
aba5acdf SH	439	case 'z':
	440	dump_zeros = 1;
	441	break;
	442	case 'r':
	443	reset_history = 1;
	444	break;
	445	case 'a':
	446	ignore_history = 1;
	447	break;
	448	case 's':
	449	no_update = 1;
	450	break;
	451	case 'n':
	452	no_output = 1;
	453	break;
	454	case 'd':
	455	scan_interval = 1000*atoi(optarg);
	456	break;
	457	case 't':
	458	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	459	time_constant <= 0) {
	460	fprintf(stderr, "rtacct: invalid time constant divisor\n");
	461	exit(-1);
	462	}
	463	break;
	464	case 'v':
	465	case 'V':
fbef6555	466	printf("rtacct utility, iproute2-%s\n", version);
aba5acdf SH	467	exit(0);
	468	case 'M':
	469	/* Some secret undocumented option, nobody
	470	* is expected to ask about its sense. See?
	471	*/
	472	sscanf(optarg, "%lx", &magic_number);
	473	break;
	474	case 'h':
	475	case '?':
	476	default:
	477	usage();
	478	}
	479	}
	480
	481	argc -= optind;
	482	argv += optind;
	483
	484	if (argc) {
	485	while (argc > 0) {
	486	__u32 realm;
acd1e437	487
aba5acdf SH	488	if (rtnl_rtrealm_a2n(&realm, argv[0])) {
	489	fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
	490	exit(-1);
	491	}
	492	rmap[realm>>5] \|= (1<<(realm&0x1f));
	493	argc--; argv++;
	494	}
	495	} else {
	496	memset(rmap, ~0, sizeof(rmap));
	497	/* Always suppress zeros. */
	498	dump_zeros = 0;
	499	}
	500
	501	sun.sun_family = AF_UNIX;
	502	sun.sun_path[0] = 0;
	503	sprintf(sun.sun_path+1, "rtacct%d", getuid());
	504
	505	if (scan_interval > 0) {
	506	if (time_constant == 0)
	507	time_constant = 60;
	508	time_constant *= 1000;
	509	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
	510	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	511	perror("rtacct: socket");
	512	exit(-1);
	513	}
acd1e437	514	if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
aba5acdf SH	515	perror("rtacct: bind");
	516	exit(-1);
	517	}
	518	if (listen(fd, 5) < 0) {
	519	perror("rtacct: listen");
	520	exit(-1);
	521	}
a7a9ddbb MF	522	if (daemon(0, 0)) {
	523	perror("rtacct: daemon");
	524	exit(-1);
	525	}
aba5acdf SH	526	signal(SIGPIPE, SIG_IGN);
	527	signal(SIGCHLD, sigchild);
	528	server_loop(fd);
	529	exit(0);
	530	}
	531
	532	if (getenv("RTACCT_HISTORY"))
8988b02e	533	snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
aba5acdf SH	534	else
	535	sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
	536
	537	if (reset_history)
	538	unlink(hist_name);
	539
	540	if (!ignore_history \|\| !no_update) {
	541	struct stat stb;
	542
	543	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	544	if (fd < 0) {
	545	perror("rtacct: open history file");
	546	exit(-1);
	547	}
	548	if (flock(fd, LOCK_EX)) {
	549	perror("rtacct: flock history file");
	550	exit(-1);
	551	}
	552	if (fstat(fd, &stb) != 0) {
	553	perror("rtacct: fstat history file");
	554	exit(-1);
	555	}
	556	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	557	fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
	558	exit(-1);
	559	}
	560	if (stb.st_size != sizeof(*hist_db))
8988b02e SH	561	if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
	562	perror("rtacct: write history file");
	563	exit(-1);
	564	}
aba5acdf SH	565
	566	hist_db = mmap(NULL, sizeof(*hist_db),
	567	PROT_READ\|PROT_WRITE,
	568	no_update ? MAP_PRIVATE : MAP_SHARED,
	569	fd, 0);
	570
	571	if ((unsigned long)hist_db == ~0UL) {
	572	perror("mmap");
	573	exit(-1);
	574	}
	575
	576	if (!ignore_history) {
	577	FILE *tfp;
9a230771	578	long uptime = -1;
acd1e437	579
aba5acdf SH	580	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	581	if (fscanf(tfp, "%ld", &uptime) != 1)
	582	uptime = -1;
	583	fclose(tfp);
	584	}
	585
	586	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	587	fprintf(stderr, "rtacct: history is aged out, resetting\n");
	588	memset(hist_db, 0, sizeof(*hist_db));
	589	}
	590	}
	591
	592	close(fd);
	593	}
	594
	595	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
acd1e437	596	(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
aba5acdf	597	\|\| (strcpy(sun.sun_path+1, "rtacct0"),
acd1e437	598	connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
aba5acdf	599	&& verify_forging(fd) == 0) {
acd1e437	600	nread(fd, (char )kern_db, sizeof(kern_db));
aba5acdf SH	601	if (hist_db && hist_db->signature[0] &&
	602	strcmp(kern_db->signature, hist_db->signature)) {
	603	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	604	hist_db = NULL;
	605	}
	606	close(fd);
	607	} else {
	608	if (fd >= 0)
	609	close(fd);
	610
	611	if (hist_db && hist_db->signature[0] &&
	612	strcmp(hist_db->signature, "kernel")) {
	613	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	614	hist_db = NULL;
	615	}
	616
	617	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	618	strcpy(kern_db->signature, "kernel");
	619	}
	620
	621	if (ignore_history \|\| hist_db == NULL)
	622	dump_abs_db(stdout);
	623	else
	624	dump_incr_db(stdout);
	625
	626	exit(0);
	627	}