[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);
}

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), "%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;
			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	}
	57
	58	int net_rtacct_open(void)
	59	{
	60	return generic_proc_open("PROC_NET_RTACCT", "net/rt_acct");
	61	}
	62
	63	__u32 rmap[256/4];
	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	};
	73
	74	struct rtacct_data kern_db_static;
	75
	76	struct rtacct_data *kern_db = &kern_db_static;
	77	struct rtacct_data *hist_db;
	78
	79	void nread(int fd, char *buf, int tot)
	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
	96
	97	__u32 read_kern_table(__u32 tbl)
	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) {
	125	nread(fd, (char)tbl, 25616);
	126	close(fd);
	127	} else {
	128	memset(tbl, 0, 256*16);
	129	}
	130	return tbl;
	131	}
	132
	133	void format_rate(FILE *fp, double rate)
	134	{
	135	char temp[64];
136
137	if (rate > 1024*1024) {
138	sprintf(temp, "%uM", (unsigned)rint(rate/(1024*1024)));
139	fprintf(fp, " %-10s", temp);
140	} else if (rate > 1024) {
141	sprintf(temp, "%uK", (unsigned)rint(rate/1024));
142	fprintf(fp, " %-10s", temp);
143	} else
144	fprintf(fp, " %-10u", (unsigned)rate);
145	}
146
147	void format_count(FILE *fp, unsigned long long val)
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
157	void dump_abs_db(FILE *fp)
158	{
159	int realm;
160	char b1[16];
161
162	if (!no_output) {
163	fprintf(fp, "#%s\n", kern_db->signature);
164	fprintf(fp,
165	"%-10s "
166	"%-10s "
167	"%-10s "
168	"%-10s "
169	"%-10s "
170	"\n"
ae665a52	171	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf SH	172	fprintf(fp,
	173	"%-10s "
	174	"%-10s "
	175	"%-10s "
	176	"%-10s "
	177	"%-10s "
	178	"\n"
ae665a52	179	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	180
	181	}
	182
	183	for (realm=0; realm<256; realm++) {
	184	int i;
	185	unsigned long long *val;
	186	double *rate;
	187
	188	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	189	continue;
	190
	191	val = &kern_db->val[realm*4];
	192	rate = &kern_db->rate[realm*4];
	193
	194	if (!dump_zeros &&
	195	!val[0] && !rate[0] &&
	196	!val[1] && !rate[1] &&
	197	!val[2] && !rate[2] &&
	198	!val[3] && !rate[3])
	199	continue;
	200
	201	if (hist_db) {
	202	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	203	}
	204
	205	if (no_output)
	206	continue;
	207
	208	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	209	for (i = 0; i < 4; i++)
ae665a52	210	format_count(fp, val[i]);
aba5acdf SH	211	fprintf(fp, "\n%-10s", "");
aba5acdf SH	212	for (i = 0; i < 4; i++)
ae665a52	213	format_rate(fp, rate[i]);
aba5acdf SH	214	fprintf(fp, "\n");
	215	}
	216	}
	217
	218
	219	void dump_incr_db(FILE *fp)
	220	{
	221	int k, realm;
	222	char b1[16];
	223
	224	if (!no_output) {
	225	fprintf(fp, "#%s\n", kern_db->signature);
	226	fprintf(fp,
	227	"%-10s "
	228	"%-10s "
	229	"%-10s "
	230	"%-10s "
	231	"%-10s "
	232	"\n"
ae665a52	233	, "Realm", "BytesTo", "PktsTo", "BytesFrom", "PktsFrom");
aba5acdf SH	234	fprintf(fp,
	235	"%-10s "
	236	"%-10s "
	237	"%-10s "
	238	"%-10s "
	239	"%-10s "
	240	"\n"
ae665a52	241	, "", "BPSTo", "PPSTo", "BPSFrom", "PPSFrom");
aba5acdf SH	242	}
	243
	244	for (realm=0; realm<256; realm++) {
	245	int ovfl = 0;
	246	int i;
	247	unsigned long long *val;
	248	double *rate;
	249	unsigned long long rval[4];
	250
	251	if (!(rmap[realm>>5] & (1<<(realm&0x1f))))
	252	continue;
	253
	254	val = &kern_db->val[realm*4];
	255	rate = &kern_db->rate[realm*4];
	256
	257	for (k=0; k<4; k++) {
	258	rval[k] = val[k];
	259	if (rval[k] < hist_db->val[realm*4+k])
	260	ovfl = 1;
	261	else
	262	rval[k] -= hist_db->val[realm*4+k];
	263	}
	264	if (ovfl) {
	265	for (k=0; k<4; k++)
	266	rval[k] = val[k];
	267	}
	268	if (hist_db) {
	269	memcpy(&hist_db->val[realm4], val, sizeof(val)*4);
	270	}
	271
	272	if (no_output)
	273	continue;
	274
	275	if (!dump_zeros &&
	276	!rval[0] && !rate[0] &&
	277	!rval[1] && !rate[1] &&
	278	!rval[2] && !rate[2] &&
	279	!rval[3] && !rate[3])
	280	continue;
	281
	282
	283	fprintf(fp, "%-10s", rtnl_rtrealm_n2a(realm, b1, sizeof(b1)));
	284	for (i = 0; i < 4; i++)
ae665a52	285	format_count(fp, rval[i]);
aba5acdf SH	286	fprintf(fp, "\n%-10s", "");
aba5acdf SH	287	for (i = 0; i < 4; i++)
ae665a52	288	format_rate(fp, rate[i]);
aba5acdf SH	289	fprintf(fp, "\n");
	290	}
	291	}
	292
	293
	294	static int children;
	295
	296	void sigchild(int signo)
	297	{
	298	}
	299
ae665a52	300	/* Server side only: read kernel data, update tables, calculate rates. */
aba5acdf SH	301
	302	void update_db(int interval)
	303	{
	304	int i;
	305	__u32 *ival;
	306	__u32 _ival[256*4];
	307
	308	ival = read_kern_table(_ival);
	309
	310	for (i=0; i<256*4; i++) {
	311	double sample;
	312	__u32 incr = ival[i] - kern_db->ival[i];
	313
	314	if (ival[i] == 0 && incr == 0 &&
	315	kern_db->val[i] == 0 && kern_db->rate[i] == 0)
	316	continue;
	317
	318	kern_db->val[i] += incr;
	319	kern_db->ival[i] = ival[i];
	320	sample = (double)(incr*1000)/interval;
	321	if (interval >= scan_interval) {
	322	kern_db->rate[i] += W*(sample-kern_db->rate[i]);
	323	} else if (interval >= 1000) {
	324	if (interval >= time_constant) {
	325	kern_db->rate[i] = sample;
	326	} else {
	327	double w = W*(double)interval/scan_interval;
	328	kern_db->rate[i] += w*(sample-kern_db->rate[i]);
	329	}
	330	}
	331	}
	332	}
	333
	334	void send_db(int fd)
	335	{
	336	int tot = 0;
	337
	338	while (tot < sizeof(*kern_db)) {
	339	int n = write(fd, ((char)kern_db) + tot, sizeof(kern_db)-tot);
	340	if (n < 0) {
	341	if (errno == EINTR)
	342	continue;
	343	return;
	344	}
	345	tot += n;
	346	}
	347	}
	348
	349
	350
	351	#define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
	352
	353
	354	void pad_kern_table(struct rtacct_data dat, __u32 ival)
	355	{
	356	int i;
	357	memset(dat->rate, 0, sizeof(dat->rate));
	358	if (dat->ival != ival)
	359	memcpy(dat->ival, ival, sizeof(dat->ival));
	360	for (i=0; i<256*4; i++)
	361	dat->val[i] = ival[i];
	362	}
	363
	364	void server_loop(int fd)
365	{
737f15f6	366	struct timeval snaptime = { 0 };
aba5acdf SH	367	struct pollfd p;
	368	p.fd = fd;
	369	p.events = p.revents = POLLIN;
	370
ae665a52	371	sprintf(kern_db->signature,
737f15f6	372	"%u.%lu sampling_interval=%d time_const=%d",
ae665a52	373	(unsigned) getpid(), (unsigned long)random(),
737f15f6	374	scan_interval/1000, time_constant/1000);
aba5acdf SH	375
	376	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	377
	378	for (;;) {
	379	int status;
	380	int tdiff;
	381	struct timeval now;
	382	gettimeofday(&now, NULL);
	383	tdiff = T_DIFF(now, snaptime);
	384	if (tdiff >= scan_interval) {
	385	update_db(tdiff);
	386	snaptime = now;
	387	tdiff = 0;
	388	}
	389	if (poll(&p, 1, tdiff + scan_interval) > 0
	390	&& (p.revents&POLLIN)) {
	391	int clnt = accept(fd, NULL, NULL);
	392	if (clnt >= 0) {
	393	pid_t pid;
	394	if (children >= 5) {
	395	close(clnt);
	396	} else if ((pid = fork()) != 0) {
	397	if (pid>0)
	398	children++;
	399	close(clnt);
	400	} else {
	401	if (tdiff > 0)
	402	update_db(tdiff);
	403	send_db(clnt);
	404	exit(0);
	405	}
	406	}
	407	}
	408	while (children && waitpid(-1, &status, WNOHANG) > 0)
	409	children--;
	410	}
	411	}
	412
	413	int verify_forging(int fd)
	414	{
	415	struct ucred cred;
737f15f6 SH	416	socklen_t olen = sizeof(cred);
737f15f6 SH	417
aba5acdf SH	418	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) \|\|
	419	olen < sizeof(cred))
	420	return -1;
	421	if (cred.uid == getuid() \|\| cred.uid == 0)
	422	return 0;
	423	return -1;
	424	}
	425
	426	static void usage(void) __attribute__((noreturn));
	427
	428	static void usage(void)
	429	{
	430	fprintf(stderr,
	431	"Usage: rtacct [ -h?vVzrnasd:t: ] [ ListOfRealms ]\n"
	432	);
	433	exit(-1);
	434	}
	435
	436	int main(int argc, char *argv[])
	437	{
	438	char hist_name[128];
	439	struct sockaddr_un sun;
	440	int ch;
	441	int fd;
	442
	443	while ((ch = getopt(argc, argv, "h?vVzrM:nasd:t:")) != EOF) {
	444	switch(ch) {
	445	case 'z':
	446	dump_zeros = 1;
	447	break;
	448	case 'r':
	449	reset_history = 1;
	450	break;
	451	case 'a':
	452	ignore_history = 1;
	453	break;
	454	case 's':
	455	no_update = 1;
	456	break;
	457	case 'n':
	458	no_output = 1;
	459	break;
	460	case 'd':
	461	scan_interval = 1000*atoi(optarg);
	462	break;
	463	case 't':
	464	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	465	time_constant <= 0) {
	466	fprintf(stderr, "rtacct: invalid time constant divisor\n");
	467	exit(-1);
	468	}
	469	break;
	470	case 'v':
	471	case 'V':
	472	printf("rtacct utility, iproute2-ss%s\n", SNAPSHOT);
	473	exit(0);
	474	case 'M':
	475	/* Some secret undocumented option, nobody
	476	* is expected to ask about its sense. See?
	477	*/
	478	sscanf(optarg, "%lx", &magic_number);
	479	break;
	480	case 'h':
	481	case '?':
482	default:
483	usage();
484	}
485	}
486
487	argc -= optind;
488	argv += optind;
489
490	if (argc) {
491	while (argc > 0) {
492	__u32 realm;
493	if (rtnl_rtrealm_a2n(&realm, argv[0])) {
494	fprintf(stderr, "Warning: realm \"%s\" does not exist.\n", argv[0]);
495	exit(-1);
496	}
497	rmap[realm>>5] \|= (1<<(realm&0x1f));
498	argc--; argv++;
499	}
500	} else {
501	memset(rmap, ~0, sizeof(rmap));
502	/* Always suppress zeros. */
503	dump_zeros = 0;
504	}
505
506	sun.sun_family = AF_UNIX;
507	sun.sun_path[0] = 0;
508	sprintf(sun.sun_path+1, "rtacct%d", getuid());
509
510	if (scan_interval > 0) {
511	if (time_constant == 0)
512	time_constant = 60;
513	time_constant *= 1000;
514	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
515	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
516	perror("rtacct: socket");
517	exit(-1);
518	}
519	if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
520	perror("rtacct: bind");
521	exit(-1);
522	}
523	if (listen(fd, 5) < 0) {
524	perror("rtacct: listen");
525	exit(-1);
526	}
a7a9ddbb MF	527	if (daemon(0, 0)) {
	528	perror("rtacct: daemon");
	529	exit(-1);
	530	}
aba5acdf SH	531	signal(SIGPIPE, SIG_IGN);
	532	signal(SIGCHLD, sigchild);
	533	server_loop(fd);
	534	exit(0);
	535	}
	536
	537	if (getenv("RTACCT_HISTORY"))
8988b02e	538	snprintf(hist_name, sizeof(hist_name), "%s", getenv("RTACCT_HISTORY"));
aba5acdf SH	539	else
	540	sprintf(hist_name, "/tmp/.rtacct.u%d", getuid());
	541
	542	if (reset_history)
	543	unlink(hist_name);
	544
	545	if (!ignore_history \|\| !no_update) {
	546	struct stat stb;
	547
	548	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	549	if (fd < 0) {
	550	perror("rtacct: open history file");
	551	exit(-1);
	552	}
	553	if (flock(fd, LOCK_EX)) {
	554	perror("rtacct: flock history file");
	555	exit(-1);
	556	}
	557	if (fstat(fd, &stb) != 0) {
	558	perror("rtacct: fstat history file");
	559	exit(-1);
	560	}
	561	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	562	fprintf(stderr, "rtacct: something is so wrong with history file, that I prefer not to proceed.\n");
	563	exit(-1);
	564	}
	565	if (stb.st_size != sizeof(*hist_db))
8988b02e SH	566	if (write(fd, kern_db, sizeof(*hist_db)) < 0) {
	567	perror("rtacct: write history file");
	568	exit(-1);
	569	}
aba5acdf SH	570
	571	hist_db = mmap(NULL, sizeof(*hist_db),
	572	PROT_READ\|PROT_WRITE,
	573	no_update ? MAP_PRIVATE : MAP_SHARED,
	574	fd, 0);
	575
	576	if ((unsigned long)hist_db == ~0UL) {
	577	perror("mmap");
	578	exit(-1);
	579	}
	580
	581	if (!ignore_history) {
	582	FILE *tfp;
	583	long uptime;
	584	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	585	if (fscanf(tfp, "%ld", &uptime) != 1)
	586	uptime = -1;
	587	fclose(tfp);
	588	}
	589
	590	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	591	fprintf(stderr, "rtacct: history is aged out, resetting\n");
	592	memset(hist_db, 0, sizeof(*hist_db));
	593	}
	594	}
	595
	596	close(fd);
	597	}
	598
	599	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
	600	(connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
	601	\|\| (strcpy(sun.sun_path+1, "rtacct0"),
	602	connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
	603	&& verify_forging(fd) == 0) {
	604	nread(fd, (char)kern_db, sizeof(kern_db));
	605	if (hist_db && hist_db->signature[0] &&
	606	strcmp(kern_db->signature, hist_db->signature)) {
	607	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	608	hist_db = NULL;
	609	}
	610	close(fd);
	611	} else {
	612	if (fd >= 0)
	613	close(fd);
	614
	615	if (hist_db && hist_db->signature[0] &&
	616	strcmp(hist_db->signature, "kernel")) {
	617	fprintf(stderr, "rtacct: history is stale, ignoring it.\n");
	618	hist_db = NULL;
	619	}
	620
	621	pad_kern_table(kern_db, read_kern_table(kern_db->ival));
	622	strcpy(kern_db->signature, "kernel");
	623	}
	624
	625	if (ignore_history \|\| hist_db == NULL)
	626	dump_abs_db(stdout);
	627	else
	628	dump_incr_db(stdout);
	629
	630	exit(0);
	631	}