[mirror_iproute2.git] / misc / nstat.c

/*
 * nstat.c	handy utility to read counters /proc/net/netstat and snmp
 *
 *		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 <signal.h>
#include <math.h>
#include <getopt.h>

#include <SNAPSHOT.h>

int dump_zeros = 0;
int reset_history = 0;
int ignore_history = 0;
int no_output = 0;
int json_output = 0;
int no_update = 0;
int scan_interval = 0;
int time_constant = 0;
double W;
char **patterns;
int npatterns;

char info_source[128];
int source_mismatch;

static int generic_proc_open(const char *env, char *name)
{
	char store[128];
	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_netstat_open(void)
{
	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
}

static int net_snmp_open(void)
{
	return generic_proc_open("PROC_NET_SNMP", "net/snmp");
}

static int net_snmp6_open(void)
{
	return generic_proc_open("PROC_NET_SNMP6", "net/snmp6");
}

struct nstat_ent
{
	struct nstat_ent *next;
	char		 *id;
	unsigned long long val;
	double		   rate;
};

struct nstat_ent *kern_db;
struct nstat_ent *hist_db;

static const char *useless_numbers[] = {
	"IpForwarding", "IpDefaultTTL",
	"TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax",
	"TcpMaxConn", "TcpCurrEstab"
};

static int useless_number(const char *id)
{
	int i;
	for (i=0; i<sizeof(useless_numbers)/sizeof(*useless_numbers); i++)
		if (strcmp(id, useless_numbers[i]) == 0)
			return 1;
	return 0;
}

static int match(const char *id)
{
	int i;

	if (npatterns == 0)
		return 1;

	for (i=0; i<npatterns; i++) {
		if (!fnmatch(patterns[i], id, 0))
			return 1;
	}
	return 0;
}

static void load_good_table(FILE *fp)
{
	char buf[4096];
	struct nstat_ent *db = NULL;
	struct nstat_ent *n;

	while (fgets(buf, sizeof(buf), fp) != NULL) {
		int nr;
		unsigned long long val;
		double rate;
		char idbuf[sizeof(buf)];
		if (buf[0] == '#') {
			buf[strlen(buf)-1] = 0;
			if (info_source[0] && strcmp(info_source, buf+1))
				source_mismatch = 1;
			info_source[0] = 0;
			strncat(info_source, buf+1, sizeof(info_source)-1);
			continue;
		}
		/* idbuf is as big as buf, so this is safe */
		nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
		if (nr < 2)
			abort();
		if (nr < 3)
			rate = 0;
		if (useless_number(idbuf))
			continue;
		if ((n = malloc(sizeof(*n))) == NULL)
			abort();
		n->id = strdup(idbuf);
		n->val = val;
		n->rate = rate;
		n->next = db;
		db = n;
	}

	while (db) {
		n = db;
		db = db->next;
		n->next = kern_db;
		kern_db = n;
	}
}

static int count_spaces(const char *line)
{
	int count = 0;
	char c;

	while ((c = *line++) != 0)
		count += c == ' ' || c == '\n';
	return count;
}

static void load_ugly_table(FILE *fp)
{
	char buf[4096];
	struct nstat_ent *db = NULL;
	struct nstat_ent *n;

	while (fgets(buf, sizeof(buf), fp) != NULL) {
		char idbuf[sizeof(buf)];
		int  off;
		char *p;
		int count1, count2, skip = 0;

		p = strchr(buf, ':');
		if (!p)
			abort();
		count1 = count_spaces(buf);
		*p = 0;
		idbuf[0] = 0;
		strncat(idbuf, buf, sizeof(idbuf) - 1);
		off = p - buf;
		p += 2;

		while (*p) {
			char *next;
			if ((next = strchr(p, ' ')) != NULL)
				*next++ = 0;
			else if ((next = strchr(p, '\n')) != NULL)
				*next++ = 0;
			if (off < sizeof(idbuf)) {
				idbuf[off] = 0;
				strncat(idbuf, p, sizeof(idbuf) - off - 1);
			}
			n = malloc(sizeof(*n));
			if (!n)
				abort();
			n->id = strdup(idbuf);
			n->rate = 0;
			n->next = db;
			db = n;
			p = next;
		}
		n = db;
		if (fgets(buf, sizeof(buf), fp) == NULL)
			abort();
		count2 = count_spaces(buf);
		if (count2 > count1)
			skip = count2 - count1;
		do {
			p = strrchr(buf, ' ');
			if (!p)
				abort();
			*p = 0;
			if (sscanf(p+1, "%llu", &n->val) != 1)
				abort();
			/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
			if (skip)
				skip--;
			else
				n = n->next;
		} while (p > buf + off + 2);
	}

	while (db) {
		n = db;
		db = db->next;
		if (useless_number(n->id)) {
			free(n->id);
			free(n);
		} else {
			n->next = kern_db;
			kern_db = n;
		}
	}
}

static void load_snmp(void)
{
	FILE *fp = fdopen(net_snmp_open(), "r");
	if (fp) {
		load_ugly_table(fp);
		fclose(fp);
	}
}

static void load_snmp6(void)
{
	FILE *fp = fdopen(net_snmp6_open(), "r");
	if (fp) {
		load_good_table(fp);
		fclose(fp);
	}
}

static void load_netstat(void)
{
	FILE *fp = fdopen(net_netstat_open(), "r");
	if (fp) {
		load_ugly_table(fp);
		fclose(fp);
	}
}


static void dump_kern_db(FILE *fp, int to_hist)
{
	struct nstat_ent *n, *h;
	const char *eol = "\n";

	h = hist_db;
	if (json_output)
		fprintf(fp, "{ \"%s\":{", info_source);
	else
		fprintf(fp, "#%s\n", info_source);

	for (n=kern_db; n; n=n->next) {
		unsigned long long val = n->val;
		if (!dump_zeros && !val && !n->rate)
			continue;
		if (!match(n->id)) {
			struct nstat_ent *h1;
			if (!to_hist)
				continue;
			for (h1 = h; h1; h1 = h1->next) {
				if (strcmp(h1->id, n->id) == 0) {
					val = h1->val;
					h = h1->next;
					break;
				}
			}
		}

		if (json_output) {
			fprintf(fp, "%s    \"%s\":%llu",
				eol, n->id, val);
			eol = ",\n";
		} else
			fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
	}
	if (json_output)
		fprintf(fp, "\n} }\n");
}

static void dump_incr_db(FILE *fp)
{
	struct nstat_ent *n, *h;
	const char *eol = "\n";

	h = hist_db;
	if (json_output)
		fprintf(fp, "{ \"%s\":{", info_source);
	else
		fprintf(fp, "#%s\n", info_source);

	for (n=kern_db; n; n=n->next) {
		int ovfl = 0;
		unsigned long long val = n->val;
		struct nstat_ent *h1;
		for (h1 = h; h1; h1 = h1->next) {
			if (strcmp(h1->id, n->id) == 0) {
				if (val < h1->val) {
					ovfl = 1;
					val = h1->val;
				}
				val -= h1->val;
				h = h1->next;
				break;
			}
		}
		if (!dump_zeros && !val && !n->rate)
			continue;
		if (!match(n->id))
			continue;

		if (json_output) {
			fprintf(fp, "%s    \"%s\":%llu",
				eol, n->id, val);
			eol = ",\n";
		} else
			fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
				n->rate, ovfl?" (overflow)":"");
	}
	if (json_output)
		fprintf(fp, "\n} }\n");
}

static int children;

static void sigchild(int signo)
{
}

static void update_db(int interval)
{
	struct nstat_ent *n, *h;

	n = kern_db;
	kern_db = NULL;

	load_netstat();
	load_snmp6();
	load_snmp();

	h = kern_db;
	kern_db = n;

	for (n = kern_db; n; n = n->next) {
		struct nstat_ent *h1;
		for (h1 = h; h1; h1 = h1->next) {
			if (strcmp(h1->id, n->id) == 0) {
				double sample;
				unsigned long long incr = h1->val - n->val;

				n->val = h1->val;
				sample = (double)incr * 1000.0 / interval;
				if (interval >= scan_interval) {
					n->rate += W*(sample-n->rate);
				} else if (interval >= 1000) {
					if (interval >= time_constant) {
						n->rate = sample;
					} else {
						double w = W*(double)interval/scan_interval;
						n->rate += w*(sample-n->rate);
					}
				}

				while (h != h1) {
					struct nstat_ent *tmp = h;
					h = h->next;
					free(tmp->id);
					free(tmp);
				};
				h = h1->next;
				free(h1->id);
				free(h1);
				break;
			}
		}
	}
}

#define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)


static void server_loop(int fd)
{
	struct timeval snaptime = { 0 };
	struct pollfd p;
	p.fd = fd;
	p.events = p.revents = POLLIN;

	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
		getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);

	load_netstat();
	load_snmp6();
	load_snmp();

	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 {
					FILE *fp = fdopen(clnt, "w");
					if (fp) {
						if (tdiff > 0)
							update_db(tdiff);
						dump_kern_db(fp, 0);
					}
					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: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
"   -h, --help		this message\n"
"   -a, --ignore	ignore history\n"
"   -d, --scan=SECS	sample every statistics every SECS\n"
"   -j, --json          format output in JSON\n"
"   -n, --nooutput	do history only\n"
"   -r, --reset		reset history\n"
"   -s, --noupdate	don\'t update history\n"
"   -t, --interval=SECS	report average over the last SECS\n"
"   -V, --version	output version information\n"
"   -z, --zeros		show entries with zero activity\n");
	exit(-1);
}

static const struct option longopts[] = {
	{ "help", 0, 0, 'h' },
	{ "ignore",  0,  0, 'a' },
	{ "scan", 1, 0, 'd'},
	{ "nooutput", 0, 0, 'n' },
	{ "json", 0, 0, 'j' },
	{ "reset", 0, 0, 'r' },
	{ "noupdate", 0, 0, 's' },
	{ "interval", 1, 0, 't' },
	{ "version", 0, 0, 'V' },
	{ "zeros", 0, 0, 'z' },
	{ 0 }
};

int main(int argc, char *argv[])
{
	char *hist_name;
	struct sockaddr_un sun;
	FILE *hist_fp = NULL;
	int ch;
	int fd;

	while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:j",
				 longopts, NULL)) != 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, "nstat: invalid time constant divisor\n");
				exit(-1);
			}
			break;
		case 'j':
			json_output = 1;
			break;
		case 'v':
		case 'V':
			printf("nstat utility, iproute2-ss%s\n", SNAPSHOT);
			exit(0);
		case 'h':
		case '?':
		default:
			usage();
		}
	}

	argc -= optind;
	argv += optind;

	sun.sun_family = AF_UNIX;
	sun.sun_path[0] = 0;
	sprintf(sun.sun_path+1, "nstat%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("nstat: socket");
			exit(-1);
		}
		if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
			perror("nstat: bind");
			exit(-1);
		}
		if (listen(fd, 5) < 0) {
			perror("nstat: listen");
			exit(-1);
		}
		if (daemon(0, 0)) {
			perror("nstat: daemon");
			exit(-1);
		}
		signal(SIGPIPE, SIG_IGN);
		signal(SIGCHLD, sigchild);
		server_loop(fd);
		exit(0);
	}

	patterns = argv;
	npatterns = argc;

	if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) {
		hist_name = malloc(128);
		sprintf(hist_name, "/tmp/.nstat.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("nstat: open history file");
			exit(-1);
		}
		if ((hist_fp = fdopen(fd, "r+")) == NULL) {
			perror("nstat: fdopen history file");
			exit(-1);
		}
		if (flock(fileno(hist_fp), LOCK_EX)) {
			perror("nstat: flock history file");
			exit(-1);
		}
		if (fstat(fileno(hist_fp), &stb) != 0) {
			perror("nstat: fstat history file");
			exit(-1);
		}
		if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
			fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n");
			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, "nstat: history is aged out, resetting\n");
				ftruncate(fileno(hist_fp), 0);
			}
		}

		load_good_table(hist_fp);

		hist_db = kern_db;
		kern_db = NULL;
	}

	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, "nstat0"),
		 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
	    && verify_forging(fd) == 0) {
		FILE *sfp = fdopen(fd, "r");
		load_good_table(sfp);
		if (hist_db && source_mismatch) {
			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
			hist_db = NULL;
		}
		fclose(sfp);
	} else {
		if (fd >= 0)
			close(fd);
		if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
			hist_db = NULL;
			info_source[0] = 0;
		}
		load_netstat();
		load_snmp6();
		load_snmp();
		if (info_source[0] == 0)
			strcpy(info_source, "kernel");
	}

	if (!no_output) {
		if (ignore_history || hist_db == NULL)
			dump_kern_db(stdout, 0);
		else
			dump_incr_db(stdout);
	}
	if (!no_update) {
		ftruncate(fileno(hist_fp), 0);
		rewind(hist_fp);

		json_output = 0;
		dump_kern_db(hist_fp, 1);
		fclose(hist_fp);
	}
	exit(0);
}
Commit	Line	Data
aba5acdf SH	1	/*
	2	* nstat.c handy utility to read counters /proc/net/netstat and snmp
	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	#include <stdio.h>
	13	#include <stdlib.h>
	14	#include <unistd.h>
	15	#include <fcntl.h>
	16	#include <string.h>
	17	#include <errno.h>
	18	#include <time.h>
	19	#include <sys/time.h>
	20	#include <fnmatch.h>
	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 <signal.h>
	28	#include <math.h>
404582c8	29	#include <getopt.h>
aba5acdf SH	30
	31	#include <SNAPSHOT.h>
	32
	33	int dump_zeros = 0;
	34	int reset_history = 0;
	35	int ignore_history = 0;
	36	int no_output = 0;
d48ed3f4	37	int json_output = 0;
aba5acdf SH	38	int no_update = 0;
	39	int scan_interval = 0;
	40	int time_constant = 0;
	41	double W;
	42	char **patterns;
	43	int npatterns;
	44
	45	char info_source[128];
	46	int source_mismatch;
	47
4ffc44ca	48	static int generic_proc_open(const char env, char name)
aba5acdf SH	49	{
	50	char store[128];
	51	char *p = getenv(env);
	52	if (!p) {
	53	p = getenv("PROC_ROOT") ? : "/proc";
	54	snprintf(store, sizeof(store)-1, "%s/%s", p, name);
	55	p = store;
	56	}
4ffc44ca	57	return open(p, O_RDONLY);
aba5acdf SH	58	}
aba5acdf SH	59
d1f28cf1	60	static int net_netstat_open(void)
aba5acdf SH	61	{
	62	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
	63	}
	64
d1f28cf1	65	static int net_snmp_open(void)
aba5acdf SH	66	{
	67	return generic_proc_open("PROC_NET_SNMP", "net/snmp");
	68	}
	69
d1f28cf1	70	static int net_snmp6_open(void)
aba5acdf SH	71	{
	72	return generic_proc_open("PROC_NET_SNMP6", "net/snmp6");
	73	}
	74
	75	struct nstat_ent
	76	{
	77	struct nstat_ent *next;
	78	char *id;
	79	unsigned long long val;
aba5acdf SH	80	double rate;
	81	};
	82
	83	struct nstat_ent *kern_db;
	84	struct nstat_ent *hist_db;
	85
d1f28cf1 SH	86	static const char *useless_numbers[] = {
	87	"IpForwarding", "IpDefaultTTL",
	88	"TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax",
	89	"TcpMaxConn", "TcpCurrEstab"
aba5acdf SH	90	};
aba5acdf SH	91
d1f28cf1	92	static int useless_number(const char *id)
aba5acdf SH	93	{
	94	int i;
	95	for (i=0; i<sizeof(useless_numbers)/sizeof(*useless_numbers); i++)
	96	if (strcmp(id, useless_numbers[i]) == 0)
	97	return 1;
	98	return 0;
	99	}
	100
d1f28cf1	101	static int match(const char *id)
aba5acdf SH	102	{
	103	int i;
	104
	105	if (npatterns == 0)
	106	return 1;
	107
	108	for (i=0; i<npatterns; i++) {
	109	if (!fnmatch(patterns[i], id, 0))
	110	return 1;
	111	}
	112	return 0;
	113	}
	114
d1f28cf1	115	static void load_good_table(FILE *fp)
aba5acdf SH	116	{
	117	char buf[4096];
	118	struct nstat_ent *db = NULL;
	119	struct nstat_ent *n;
	120
	121	while (fgets(buf, sizeof(buf), fp) != NULL) {
	122	int nr;
	123	unsigned long long val;
	124	double rate;
b482ffa6	125	char idbuf[sizeof(buf)];
aba5acdf SH	126	if (buf[0] == '#') {
	127	buf[strlen(buf)-1] = 0;
	128	if (info_source[0] && strcmp(info_source, buf+1))
	129	source_mismatch = 1;
b482ffa6	130	info_source[0] = 0;
b482ffa6	131	strncat(info_source, buf+1, sizeof(info_source)-1);
aba5acdf SH	132	continue;
aba5acdf SH	133	}
b482ffa6	134	/* idbuf is as big as buf, so this is safe */
aba5acdf SH	135	nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
	136	if (nr < 2)
	137	abort();
	138	if (nr < 3)
	139	rate = 0;
	140	if (useless_number(idbuf))
	141	continue;
	142	if ((n = malloc(sizeof(*n))) == NULL)
	143	abort();
	144	n->id = strdup(idbuf);
aba5acdf SH	145	n->val = val;
	146	n->rate = rate;
	147	n->next = db;
	148	db = n;
	149	}
	150
	151	while (db) {
	152	n = db;
	153	db = db->next;
	154	n->next = kern_db;
	155	kern_db = n;
	156	}
	157	}
	158
d4717914 ED	159	static int count_spaces(const char *line)
	160	{
	161	int count = 0;
	162	char c;
	163
	164	while ((c = *line++) != 0)
	165	count += c == ' ' \|\| c == '\n';
	166	return count;
	167	}
aba5acdf	168
d1f28cf1	169	static void load_ugly_table(FILE *fp)
aba5acdf SH	170	{
	171	char buf[4096];
	172	struct nstat_ent *db = NULL;
	173	struct nstat_ent *n;
	174
	175	while (fgets(buf, sizeof(buf), fp) != NULL) {
b482ffa6	176	char idbuf[sizeof(buf)];
aba5acdf SH	177	int off;
aba5acdf SH	178	char *p;
d4717914	179	int count1, count2, skip = 0;
aba5acdf SH	180
	181	p = strchr(buf, ':');
	182	if (!p)
	183	abort();
d4717914	184	count1 = count_spaces(buf);
aba5acdf	185	*p = 0;
b482ffa6	186	idbuf[0] = 0;
	187	strncat(idbuf, buf, sizeof(idbuf) - 1);
	188	off = p - buf;
aba5acdf SH	189	p += 2;
	190
	191	while (*p) {
	192	char *next;
	193	if ((next = strchr(p, ' ')) != NULL)
	194	*next++ = 0;
	195	else if ((next = strchr(p, '\n')) != NULL)
	196	*next++ = 0;
b482ffa6	197	if (off < sizeof(idbuf)) {
	198	idbuf[off] = 0;
	199	strncat(idbuf, p, sizeof(idbuf) - off - 1);
	200	}
aba5acdf SH	201	n = malloc(sizeof(*n));
	202	if (!n)
	203	abort();
	204	n->id = strdup(idbuf);
	205	n->rate = 0;
	206	n->next = db;
	207	db = n;
	208	p = next;
	209	}
	210	n = db;
	211	if (fgets(buf, sizeof(buf), fp) == NULL)
	212	abort();
d4717914 ED	213	count2 = count_spaces(buf);
	214	if (count2 > count1)
	215	skip = count2 - count1;
aba5acdf SH	216	do {
	217	p = strrchr(buf, ' ');
	218	if (!p)
	219	abort();
	220	*p = 0;
cdb2227e	221	if (sscanf(p+1, "%llu", &n->val) != 1)
aba5acdf	222	abort();
aba5acdf	223	/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
d4717914 ED	224	if (skip)
d4717914 ED	225	skip--;
aba5acdf SH	226	else
	227	n = n->next;
	228	} while (p > buf + off + 2);
	229	}
	230
	231	while (db) {
	232	n = db;
	233	db = db->next;
	234	if (useless_number(n->id)) {
	235	free(n->id);
	236	free(n);
	237	} else {
	238	n->next = kern_db;
	239	kern_db = n;
	240	}
	241	}
	242	}
	243
d1f28cf1	244	static void load_snmp(void)
aba5acdf SH	245	{
	246	FILE *fp = fdopen(net_snmp_open(), "r");
	247	if (fp) {
	248	load_ugly_table(fp);
	249	fclose(fp);
	250	}
	251	}
	252
d1f28cf1	253	static void load_snmp6(void)
aba5acdf SH	254	{
	255	FILE *fp = fdopen(net_snmp6_open(), "r");
	256	if (fp) {
	257	load_good_table(fp);
	258	fclose(fp);
	259	}
	260	}
	261
d1f28cf1	262	static void load_netstat(void)
aba5acdf SH	263	{
	264	FILE *fp = fdopen(net_netstat_open(), "r");
	265	if (fp) {
	266	load_ugly_table(fp);
	267	fclose(fp);
	268	}
	269	}
	270
d48ed3f4	271
d1f28cf1	272	static void dump_kern_db(FILE *fp, int to_hist)
aba5acdf SH	273	{
aba5acdf SH	274	struct nstat_ent n, h;
d48ed3f4 SH	275	const char *eol = "\n";
d48ed3f4 SH	276
aba5acdf	277	h = hist_db;
d48ed3f4	278	if (json_output)
404582c8	279	fprintf(fp, "{ \"%s\":{", info_source);
d48ed3f4 SH	280	else
d48ed3f4 SH	281	fprintf(fp, "#%s\n", info_source);
404582c8	282
aba5acdf SH	283	for (n=kern_db; n; n=n->next) {
	284	unsigned long long val = n->val;
	285	if (!dump_zeros && !val && !n->rate)
	286	continue;
	287	if (!match(n->id)) {
	288	struct nstat_ent *h1;
	289	if (!to_hist)
	290	continue;
	291	for (h1 = h; h1; h1 = h1->next) {
	292	if (strcmp(h1->id, n->id) == 0) {
	293	val = h1->val;
	294	h = h1->next;
	295	break;
	296	}
	297	}
	298	}
d48ed3f4 SH	299
d48ed3f4 SH	300	if (json_output) {
404582c8 SH	301	fprintf(fp, "%s \"%s\":%llu",
404582c8 SH	302	eol, n->id, val);
d48ed3f4 SH	303	eol = ",\n";
	304	} else
	305	fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
aba5acdf	306	}
d48ed3f4	307	if (json_output)
404582c8	308	fprintf(fp, "\n} }\n");
aba5acdf SH	309	}
aba5acdf SH	310
d1f28cf1	311	static void dump_incr_db(FILE *fp)
aba5acdf SH	312	{
aba5acdf SH	313	struct nstat_ent n, h;
d48ed3f4 SH	314	const char *eol = "\n";
d48ed3f4 SH	315
aba5acdf	316	h = hist_db;
d48ed3f4	317	if (json_output)
404582c8	318	fprintf(fp, "{ \"%s\":{", info_source);
d48ed3f4 SH	319	else
	320	fprintf(fp, "#%s\n", info_source);
	321
aba5acdf SH	322	for (n=kern_db; n; n=n->next) {
	323	int ovfl = 0;
	324	unsigned long long val = n->val;
	325	struct nstat_ent *h1;
	326	for (h1 = h; h1; h1 = h1->next) {
	327	if (strcmp(h1->id, n->id) == 0) {
	328	if (val < h1->val) {
	329	ovfl = 1;
	330	val = h1->val;
	331	}
	332	val -= h1->val;
	333	h = h1->next;
	334	break;
	335	}
	336	}
	337	if (!dump_zeros && !val && !n->rate)
	338	continue;
	339	if (!match(n->id))
	340	continue;
d48ed3f4 SH	341
d48ed3f4 SH	342	if (json_output) {
404582c8 SH	343	fprintf(fp, "%s \"%s\":%llu",
404582c8 SH	344	eol, n->id, val);
d48ed3f4 SH	345	eol = ",\n";
	346	} else
	347	fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
	348	n->rate, ovfl?" (overflow)":"");
aba5acdf	349	}
d48ed3f4	350	if (json_output)
404582c8	351	fprintf(fp, "\n} }\n");
aba5acdf SH	352	}
	353
	354	static int children;
	355
d1f28cf1	356	static void sigchild(int signo)
aba5acdf SH	357	{
	358	}
	359
d1f28cf1	360	static void update_db(int interval)
aba5acdf SH	361	{
	362	struct nstat_ent n, h;
	363
	364	n = kern_db;
	365	kern_db = NULL;
	366
	367	load_netstat();
	368	load_snmp6();
	369	load_snmp();
	370
	371	h = kern_db;
	372	kern_db = n;
	373
	374	for (n = kern_db; n; n = n->next) {
	375	struct nstat_ent *h1;
	376	for (h1 = h; h1; h1 = h1->next) {
	377	if (strcmp(h1->id, n->id) == 0) {
	378	double sample;
cdb2227e ED	379	unsigned long long incr = h1->val - n->val;
	380
	381	n->val = h1->val;
	382	sample = (double)incr * 1000.0 / interval;
aba5acdf SH	383	if (interval >= scan_interval) {
	384	n->rate += W*(sample-n->rate);
	385	} else if (interval >= 1000) {
	386	if (interval >= time_constant) {
	387	n->rate = sample;
	388	} else {
	389	double w = W*(double)interval/scan_interval;
	390	n->rate += w*(sample-n->rate);
	391	}
	392	}
	393
	394	while (h != h1) {
	395	struct nstat_ent *tmp = h;
	396	h = h->next;
	397	free(tmp->id);
	398	free(tmp);
	399	};
	400	h = h1->next;
	401	free(h1->id);
	402	free(h1);
	403	break;
	404	}
	405	}
	406	}
	407	}
	408
	409	#define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
	410
	411
d1f28cf1	412	static void server_loop(int fd)
aba5acdf	413	{
737f15f6	414	struct timeval snaptime = { 0 };
aba5acdf SH	415	struct pollfd p;
	416	p.fd = fd;
	417	p.events = p.revents = POLLIN;
ae665a52	418
aba5acdf SH	419	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
	420	getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
	421
	422	load_netstat();
	423	load_snmp6();
	424	load_snmp();
	425
	426	for (;;) {
	427	int status;
	428	int tdiff;
	429	struct timeval now;
	430	gettimeofday(&now, NULL);
	431	tdiff = T_DIFF(now, snaptime);
	432	if (tdiff >= scan_interval) {
	433	update_db(tdiff);
	434	snaptime = now;
	435	tdiff = 0;
	436	}
	437	if (poll(&p, 1, tdiff + scan_interval) > 0
	438	&& (p.revents&POLLIN)) {
	439	int clnt = accept(fd, NULL, NULL);
	440	if (clnt >= 0) {
	441	pid_t pid;
	442	if (children >= 5) {
	443	close(clnt);
	444	} else if ((pid = fork()) != 0) {
	445	if (pid>0)
	446	children++;
	447	close(clnt);
	448	} else {
	449	FILE *fp = fdopen(clnt, "w");
	450	if (fp) {
	451	if (tdiff > 0)
	452	update_db(tdiff);
	453	dump_kern_db(fp, 0);
	454	}
	455	exit(0);
	456	}
	457	}
	458	}
	459	while (children && waitpid(-1, &status, WNOHANG) > 0)
	460	children--;
	461	}
	462	}
	463
d1f28cf1	464	static int verify_forging(int fd)
aba5acdf SH	465	{
aba5acdf SH	466	struct ucred cred;
737f15f6 SH	467	socklen_t olen = sizeof(cred);
737f15f6 SH	468
aba5acdf SH	469	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) \|\|
	470	olen < sizeof(cred))
	471	return -1;
	472	if (cred.uid == getuid() \|\| cred.uid == 0)
	473	return 0;
	474	return -1;
	475	}
	476
	477	static void usage(void) __attribute__((noreturn));
	478
	479	static void usage(void)
	480	{
	481	fprintf(stderr,
404582c8 SH	482	"Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
	483	" -h, --help this message\n"
	484	" -a, --ignore ignore history\n"
	485	" -d, --scan=SECS sample every statistics every SECS\n"
	486	" -j, --json format output in JSON\n"
	487	" -n, --nooutput do history only\n"
	488	" -r, --reset reset history\n"
	489	" -s, --noupdate don\'t update history\n"
	490	" -t, --interval=SECS report average over the last SECS\n"
	491	" -V, --version output version information\n"
	492	" -z, --zeros show entries with zero activity\n");
aba5acdf SH	493	exit(-1);
	494	}
	495
404582c8 SH	496	static const struct option longopts[] = {
	497	{ "help", 0, 0, 'h' },
	498	{ "ignore", 0, 0, 'a' },
	499	{ "scan", 1, 0, 'd'},
	500	{ "nooutput", 0, 0, 'n' },
	501	{ "json", 0, 0, 'j' },
	502	{ "reset", 0, 0, 'r' },
	503	{ "noupdate", 0, 0, 's' },
	504	{ "interval", 1, 0, 't' },
	505	{ "version", 0, 0, 'V' },
	506	{ "zeros", 0, 0, 'z' },
	507	{ 0 }
	508	};
aba5acdf SH	509
	510	int main(int argc, char *argv[])
	511	{
896ebd6c	512	char *hist_name;
aba5acdf SH	513	struct sockaddr_un sun;
	514	FILE *hist_fp = NULL;
	515	int ch;
	516	int fd;
	517
404582c8 SH	518	while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:j",
404582c8 SH	519	longopts, NULL)) != EOF) {
aba5acdf SH	520	switch(ch) {
	521	case 'z':
	522	dump_zeros = 1;
	523	break;
	524	case 'r':
	525	reset_history = 1;
	526	break;
	527	case 'a':
	528	ignore_history = 1;
	529	break;
	530	case 's':
	531	no_update = 1;
	532	break;
	533	case 'n':
	534	no_output = 1;
	535	break;
	536	case 'd':
	537	scan_interval = 1000*atoi(optarg);
	538	break;
	539	case 't':
	540	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	541	time_constant <= 0) {
	542	fprintf(stderr, "nstat: invalid time constant divisor\n");
	543	exit(-1);
	544	}
	545	break;
d48ed3f4 SH	546	case 'j':
	547	json_output = 1;
	548	break;
aba5acdf SH	549	case 'v':
	550	case 'V':
	551	printf("nstat utility, iproute2-ss%s\n", SNAPSHOT);
	552	exit(0);
	553	case 'h':
	554	case '?':
	555	default:
	556	usage();
	557	}
	558	}
	559
	560	argc -= optind;
	561	argv += optind;
	562
	563	sun.sun_family = AF_UNIX;
	564	sun.sun_path[0] = 0;
	565	sprintf(sun.sun_path+1, "nstat%d", getuid());
	566
	567	if (scan_interval > 0) {
	568	if (time_constant == 0)
	569	time_constant = 60;
	570	time_constant *= 1000;
	571	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
	572	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	573	perror("nstat: socket");
	574	exit(-1);
	575	}
	576	if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
	577	perror("nstat: bind");
	578	exit(-1);
	579	}
	580	if (listen(fd, 5) < 0) {
	581	perror("nstat: listen");
	582	exit(-1);
	583	}
a7a9ddbb MF	584	if (daemon(0, 0)) {
	585	perror("nstat: daemon");
	586	exit(-1);
	587	}
aba5acdf SH	588	signal(SIGPIPE, SIG_IGN);
	589	signal(SIGCHLD, sigchild);
	590	server_loop(fd);
	591	exit(0);
	592	}
	593
	594	patterns = argv;
	595	npatterns = argc;
	596
896ebd6c SH	597	if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) {
896ebd6c SH	598	hist_name = malloc(128);
aba5acdf	599	sprintf(hist_name, "/tmp/.nstat.u%d", getuid());
896ebd6c	600	}
aba5acdf SH	601
	602	if (reset_history)
	603	unlink(hist_name);
	604
	605	if (!ignore_history \|\| !no_update) {
	606	struct stat stb;
	607
	608	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	609	if (fd < 0) {
	610	perror("nstat: open history file");
	611	exit(-1);
	612	}
	613	if ((hist_fp = fdopen(fd, "r+")) == NULL) {
	614	perror("nstat: fdopen history file");
	615	exit(-1);
	616	}
	617	if (flock(fileno(hist_fp), LOCK_EX)) {
	618	perror("nstat: flock history file");
	619	exit(-1);
	620	}
	621	if (fstat(fileno(hist_fp), &stb) != 0) {
	622	perror("nstat: fstat history file");
	623	exit(-1);
	624	}
	625	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	626	fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n");
	627	exit(-1);
	628	}
	629	if (!ignore_history) {
	630	FILE *tfp;
9a230771	631	long uptime = -1;
aba5acdf SH	632	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	633	if (fscanf(tfp, "%ld", &uptime) != 1)
	634	uptime = -1;
	635	fclose(tfp);
	636	}
	637	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	638	fprintf(stderr, "nstat: history is aged out, resetting\n");
	639	ftruncate(fileno(hist_fp), 0);
	640	}
	641	}
	642
	643	load_good_table(hist_fp);
	644
	645	hist_db = kern_db;
	646	kern_db = NULL;
	647	}
	648
	649	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
	650	(connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
	651	\|\| (strcpy(sun.sun_path+1, "nstat0"),
	652	connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
	653	&& verify_forging(fd) == 0) {
	654	FILE *sfp = fdopen(fd, "r");
	655	load_good_table(sfp);
	656	if (hist_db && source_mismatch) {
	657	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	658	hist_db = NULL;
	659	}
	660	fclose(sfp);
	661	} else {
	662	if (fd >= 0)
	663	close(fd);
	664	if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
	665	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	666	hist_db = NULL;
	667	info_source[0] = 0;
	668	}
	669	load_netstat();
	670	load_snmp6();
	671	load_snmp();
	672	if (info_source[0] == 0)
	673	strcpy(info_source, "kernel");
	674	}
	675
	676	if (!no_output) {
	677	if (ignore_history \|\| hist_db == NULL)
	678	dump_kern_db(stdout, 0);
	679	else
	680	dump_incr_db(stdout);
	681	}
	682	if (!no_update) {
	683	ftruncate(fileno(hist_fp), 0);
	684	rewind(hist_fp);
404582c8 SH	685
404582c8 SH	686	json_output = 0;
aba5acdf	687	dump_kern_db(hist_fp, 1);
404582c8	688	fclose(hist_fp);
aba5acdf SH	689	}
	690	exit(0);
	691	}