[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 = 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);
}

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)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);
}

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) 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
	36	int reset_history = 0;
	37	int ignore_history = 0;
	38	int no_output = 0;
	39	int no_update = 0;
	40	int scan_interval = 0;
	41	int time_constant = 0;
	42	int dump_zeros = 0;
	43	unsigned long magic_number = 0;
	44	double W;
	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);
	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 SH	64
	65	struct rtacct_data
	66	{
	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);
	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) {
	124	nread(fd, (char)tbl, 25616);
	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) {
	137	sprintf(temp, "%uM", (unsigned)rint(rate/(1024*1024)));
	138	fprintf(fp, " %-10s", temp);
	139	} else if (rate > 1024) {
	140	sprintf(temp, "%uK", (unsigned)rint(rate/1024));
	141	fprintf(fp, " %-10s", temp);
	142	} else
	143	fprintf(fp, " %-10u", (unsigned)rate);
	144	}
	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,
	164	"%-10s "
	165	"%-10s "
	166	"%-10s "
	167	"%-10s "
	168	"%-10s "
	169	"\n"
ae665a52	170	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf SH	171	fprintf(fp,
	172	"%-10s "
	173	"%-10s "
	174	"%-10s "
	175	"%-10s "
	176	"%-10s "
	177	"\n"
ae665a52	178	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	179
	180	}
	181
	182	for (realm=0; realm<256; realm++) {
	183	int i;
	184	unsigned long long *val;
	185	double *rate;
	186
	187	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	188	continue;
	189
	190	val = &kern_db->val[realm*4];
	191	rate = &kern_db->rate[realm*4];
	192
	193	if (!dump_zeros &&
	194	!val[0] && !rate[0] &&
	195	!val[1] && !rate[1] &&
	196	!val[2] && !rate[2] &&
	197	!val[3] && !rate[3])
	198	continue;
	199
	200	if (hist_db) {
	201	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	202	}
	203
	204	if (no_output)
	205	continue;
	206
	207	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	208	for (i = 0; i < 4; i++)
ae665a52	209	format_count(fp, val[i]);
aba5acdf SH	210	fprintf(fp, "\n%-10s", "");
aba5acdf SH	211	for (i = 0; i < 4; i++)
ae665a52	212	format_rate(fp, rate[i]);
aba5acdf SH	213	fprintf(fp, "\n");
	214	}
	215	}
	216
	217
d1f28cf1	218	static void dump_incr_db(FILE *fp)
aba5acdf SH	219	{
	220	int k, realm;
	221	char b1[16];
	222
	223	if (!no_output) {
	224	fprintf(fp, "#%s\n", kern_db->signature);
	225	fprintf(fp,
	226	"%-10s "
	227	"%-10s "
	228	"%-10s "
	229	"%-10s "
	230	"%-10s "
	231	"\n"
ae665a52	232	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf SH	233	fprintf(fp,
	234	"%-10s "
	235	"%-10s "
	236	"%-10s "
	237	"%-10s "
	238	"%-10s "
	239	"\n"
ae665a52	240	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	241	}
	242
	243	for (realm=0; realm<256; realm++) {
	244	int ovfl = 0;
	245	int i;
	246	unsigned long long *val;
	247	double *rate;
	248	unsigned long long rval[4];
	249
	250	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	251	continue;
	252
	253	val = &kern_db->val[realm*4];
	254	rate = &kern_db->rate[realm*4];
	255
	256	for (k=0; k<4; k++) {
	257	rval[k] = val[k];
	258	if (rval[k] < hist_db->val[realm*4+k])
	259	ovfl = 1;
	260	else
	261	rval[k] -= hist_db->val[realm*4+k];
	262	}
	263	if (ovfl) {
	264	for (k=0; k<4; k++)
	265	rval[k] = val[k];
	266	}
	267	if (hist_db) {
	268	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	269	}
	270
	271	if (no_output)
	272	continue;
	273
	274	if (!dump_zeros &&
	275	!rval[0] && !rate[0] &&
	276	!rval[1] && !rate[1] &&
	277	!rval[2] && !rate[2] &&
	278	!rval[3] && !rate[3])
	279	continue;
	280
	281
	282	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	283	for (i = 0; i < 4; i++)
ae665a52	284	format_count(fp, rval[i]);
aba5acdf SH	285	fprintf(fp, "\n%-10s", "");
aba5acdf SH	286	for (i = 0; i < 4; i++)
ae665a52	287	format_rate(fp, rate[i]);
aba5acdf SH	288	fprintf(fp, "\n");
	289	}
	290	}
	291
	292
	293	static int children;
	294
d1f28cf1	295	static void sigchild(int signo)
aba5acdf SH	296	{
	297	}
	298
ae665a52	299	/* Server side only: read kernel data, update tables, calculate rates. */
aba5acdf	300
d1f28cf1	301	static void update_db(int interval)
aba5acdf SH	302	{
	303	int i;
	304	__u32 *ival;
	305	__u32 _ival[256*4];
	306
	307	ival = read_kern_table(_ival);
	308
	309	for (i=0; i<256*4; i++) {
	310	double sample;
	311	__u32 incr = ival[i] - kern_db->ival[i];
	312
	313	if (ival[i] == 0 && incr == 0 &&
	314	kern_db->val[i] == 0 && kern_db->rate[i] == 0)
	315	continue;
	316
	317	kern_db->val[i] += incr;
	318	kern_db->ival[i] = ival[i];
	319	sample = (double)(incr*1000)/interval;
	320	if (interval >= scan_interval) {
	321	kern_db->rate[i] += W*(sample-kern_db->rate[i]);
	322	} else if (interval >= 1000) {
	323	if (interval >= time_constant) {
	324	kern_db->rate[i] = sample;
	325	} else {
	326	double w = W*(double)interval/scan_interval;
	327	kern_db->rate[i] += w*(sample-kern_db->rate[i]);
	328	}
	329	}
	330	}
	331	}
	332
d1f28cf1	333	static void send_db(int fd)
aba5acdf SH	334	{
	335	int tot = 0;
	336
	337	while (tot < sizeof(*kern_db)) {
	338	int n = write(fd, ((char)kern_db) + tot, sizeof(kern_db)-tot);
	339	if (n < 0) {
	340	if (errno == EINTR)
	341	continue;
	342	return;
	343	}
	344	tot += n;
	345	}
	346	}
	347
	348
	349
	350	#define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
	351
	352
d1f28cf1	353	static void pad_kern_table(struct rtacct_data dat, __u32 ival)
aba5acdf SH	354	{
	355	int i;
	356	memset(dat->rate, 0, sizeof(dat->rate));
	357	if (dat->ival != ival)
	358	memcpy(dat->ival, ival, sizeof(dat->ival));
	359	for (i=0; i<256*4; i++)
	360	dat->val[i] = ival[i];
	361	}
	362
d1f28cf1	363	static void server_loop(int fd)
aba5acdf	364	{
737f15f6	365	struct timeval snaptime = { 0 };
aba5acdf SH	366	struct pollfd p;
	367	p.fd = fd;
	368	p.events = p.revents = POLLIN;
	369
ae665a52	370	sprintf(kern_db->signature,
737f15f6	371	"%u.%lu sampling_interval=%d time_const=%d",
ae665a52	372	(unsigned) getpid(), (unsigned long)random(),
737f15f6	373	scan_interval/1000, time_constant/1000);
aba5acdf SH	374
	375	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	376
	377	for (;;) {
	378	int status;
	379	int tdiff;
	380	struct timeval now;
	381	gettimeofday(&now, NULL);
	382	tdiff = T_DIFF(now, snaptime);
	383	if (tdiff >= scan_interval) {
	384	update_db(tdiff);
	385	snaptime = now;
	386	tdiff = 0;
	387	}
	388	if (poll(&p, 1, tdiff + scan_interval) > 0
	389	&& (p.revents&POLLIN)) {
	390	int clnt = accept(fd, NULL, NULL);
	391	if (clnt >= 0) {
	392	pid_t pid;
	393	if (children >= 5) {
	394	close(clnt);
	395	} else if ((pid = fork()) != 0) {
	396	if (pid>0)
	397	children++;
	398	close(clnt);
	399	} else {
	400	if (tdiff > 0)
	401	update_db(tdiff);
	402	send_db(clnt);
	403	exit(0);
	404	}
	405	}
	406	}
	407	while (children && waitpid(-1, &status, WNOHANG) > 0)
	408	children--;
	409	}
	410	}
	411
d1f28cf1	412	static int verify_forging(int fd)
aba5acdf SH	413	{
aba5acdf SH	414	struct ucred cred;
737f15f6 SH	415	socklen_t olen = sizeof(cred);
737f15f6 SH	416
aba5acdf SH	417	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) \|\|
	418	olen < sizeof(cred))
	419	return -1;
	420	if (cred.uid == getuid() \|\| cred.uid == 0)
	421	return 0;
	422	return -1;
	423	}
	424
	425	static void usage(void) __attribute__((noreturn));
	426
	427	static void usage(void)
	428	{
	429	fprintf(stderr,
	430	"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
	431	);
	432	exit(-1);
	433	}
	434
	435	int main(int argc, char *argv[])
	436	{
	437	char hist_name[128];
	438	struct sockaddr_un sun;
	439	int ch;
	440	int fd;
	441
	442	while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
	443	switch(ch) {
	444	case 'z':
	445	dump_zeros = 1;
	446	break;
	447	case 'r':
	448	reset_history = 1;
	449	break;
	450	case 'a':
	451	ignore_history = 1;
	452	break;
	453	case 's':
	454	no_update = 1;
	455	break;
	456	case 'n':
	457	no_output = 1;
	458	break;
	459	case 'd':
	460	scan_interval = 1000*atoi(optarg);
	461	break;
	462	case 't':
	463	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	464	time_constant <= 0) {
	465	fprintf(stderr, "rtacct: invalid time constant divisor\n");
	466	exit(-1);
	467	}
	468	break;
	469	case 'v':
	470	case 'V':
	471	printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT);
	472	exit(0);
	473	case 'M':
	474	/* Some secret undocumented option, nobody
	475	* is expected to ask about its sense. See?
	476	*/
	477	sscanf(optarg, "%lx", &magic_number);
	478	break;
	479	case 'h':
	480	case '?':
481	default:
482	usage();
483	}
484	}
485
486	argc -= optind;
487	argv += optind;
488
489	if (argc) {
490	while (argc > 0) {
491	__u32 realm;
492	if (rtnl_rtrealm_a2n(&realm, argv[0])) {
493	fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
494	exit(-1);
495	}
496	rmap[realm>>5] \|= (1<<(realm&0x1f));
497	argc--; argv++;
498	}
499	} else {
500	memset(rmap, ~0, sizeof(rmap));
501	/* Always suppress zeros. */
502	dump_zeros = 0;
503	}
504
505	sun.sun_family = AF_UNIX;
506	sun.sun_path[0] = 0;
507	sprintf(sun.sun_path+1, "rtacct%d", getuid());
508
509	if (scan_interval > 0) {
510	if (time_constant == 0)
511	time_constant = 60;
512	time_constant *= 1000;
513	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
514	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
515	perror("rtacct: socket");
516	exit(-1);
517	}
518	if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
519	perror("rtacct: bind");
520	exit(-1);
521	}
522	if (listen(fd, 5) < 0) {
523	perror("rtacct: listen");
524	exit(-1);
525	}
a7a9ddbb MF	526	if (daemon(0, 0)) {
	527	perror("rtacct: daemon");
	528	exit(-1);
	529	}
aba5acdf SH	530	signal(SIGPIPE, SIG_IGN);
	531	signal(SIGCHLD, sigchild);
	532	server_loop(fd);
	533	exit(0);
	534	}
	535
	536	if (getenv("RTACCT_HISTORY"))
8988b02e	537	snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
aba5acdf SH	538	else
	539	sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
	540
	541	if (reset_history)
	542	unlink(hist_name);
	543
	544	if (!ignore_history \|\| !no_update) {
	545	struct stat stb;
	546
	547	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	548	if (fd < 0) {
	549	perror("rtacct: open history file");
	550	exit(-1);
	551	}
	552	if (flock(fd, LOCK_EX)) {
	553	perror("rtacct: flock history file");
	554	exit(-1);
	555	}
	556	if (fstat(fd, &stb) != 0) {
	557	perror("rtacct: fstat history file");
	558	exit(-1);
	559	}
	560	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	561	fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
	562	exit(-1);
	563	}
	564	if (stb.st_size != sizeof(*hist_db))
8988b02e SH	565	if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
	566	perror("rtacct: write history file");
	567	exit(-1);
	568	}
aba5acdf SH	569
	570	hist_db = mmap(NULL, sizeof(*hist_db),
	571	PROT_READ\|PROT_WRITE,
	572	no_update ? MAP_PRIVATE : MAP_SHARED,
	573	fd, 0);
	574
	575	if ((unsigned long)hist_db == ~0UL) {
	576	perror("mmap");
	577	exit(-1);
	578	}
	579
	580	if (!ignore_history) {
	581	FILE *tfp;
9a230771	582	long uptime = -1;
aba5acdf SH	583	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	584	if (fscanf(tfp, "%ld", &uptime) != 1)
	585	uptime = -1;
	586	fclose(tfp);
	587	}
	588
	589	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	590	fprintf(stderr, "rtacct: history is aged out, resetting\n");
	591	memset(hist_db, 0, sizeof(*hist_db));
	592	}
	593	}
	594
	595	close(fd);
	596	}
	597
	598	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
	599	(connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
	600	\|\| (strcpy(sun.sun_path+1, "rtacct0"),
	601	connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
	602	&& verify_forging(fd) == 0) {
	603	nread(fd, (char)kern_db, sizeof(kern_db));
	604	if (hist_db && hist_db->signature[0] &&
	605	strcmp(kern_db->signature, hist_db->signature)) {
	606	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	607	hist_db = NULL;
	608	}
	609	close(fd);
	610	} else {
	611	if (fd >= 0)
	612	close(fd);
	613
	614	if (hist_db && hist_db->signature[0] &&
	615	strcmp(hist_db->signature, "kernel")) {
	616	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	617	hist_db = NULL;
	618	}
	619
	620	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	621	strcpy(kern_db->signature, "kernel");
	622	}
	623
	624	if (ignore_history \|\| hist_db == NULL)
	625	dump_abs_db(stdout);
	626	else
	627	dump_incr_db(stdout);
	628
	629	exit(0);
	630	}