[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 <json_writer.h>
#include <SNAPSHOT.h>
#include "utils.h"

int dump_zeros;
int reset_history;
int ignore_history;
int no_output;
int json_output;
int no_update;
int scan_interval;
int time_constant;
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");
}

static int net_sctp_snmp_open(void)
{
	return generic_proc_open("PROC_NET_SCTP_SNMP", "net/sctp/snmp");
}

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 < ARRAY_SIZE(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 = NULL;
	size_t buflen = 0;
	ssize_t nread;
	struct nstat_ent *db = NULL;
	struct nstat_ent *n;

	while ((nread = getline(&buf, &buflen, fp)) != -1) {
		char idbuf[4096];
		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;
		nread = getline(&buf, &buflen, fp);
		if (nread == -1)
			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);
	}
	free(buf);

	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_sctp_snmp(void)
{
	FILE *fp = fdopen(net_sctp_snmp_open(), "r");

	if (fp) {
		load_good_table(fp);
		fclose(fp);
	}
}

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)
{
	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
	struct nstat_ent *n, *h;

	h = hist_db;
	if (jw) {
		jsonw_start_object(jw);
		jsonw_pretty(jw, pretty);
		jsonw_name(jw, info_source);
		jsonw_start_object(jw);
	} 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 (jw)
			jsonw_uint_field(jw, n->id, val);
		else
			fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
	}

	if (jw) {
		jsonw_end_object(jw);

		jsonw_end_object(jw);
		jsonw_destroy(&jw);
	}
}

static void dump_incr_db(FILE *fp)
{
	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
	struct nstat_ent *n, *h;

	h = hist_db;
	if (jw) {
		jsonw_start_object(jw);
		jsonw_pretty(jw, pretty);
		jsonw_name(jw, info_source);
		jsonw_start_object(jw);
	} 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 (jw)
			jsonw_uint_field(jw, n->id, val);
		else
			fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
				n->rate, ovfl?" (overflow)":"");
	}

	if (jw) {
		jsonw_end_object(jw);

		jsonw_end_object(jw);
		jsonw_destroy(&jw);
	}
}

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();
	load_sctp_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();
	load_sctp_snmp();

	for (;;) {
		int status;
		time_t 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, scan_interval - tdiff) > 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)
						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"
		"   -p, --pretty	pretty print\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' },
	{ "pretty", 0, 0, 'p' },
	{ "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:jp",
				 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 'p':
			pretty = 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");
				if (ftruncate(fileno(hist_fp), 0) < 0)
					perror("nstat: ftruncate");
			}
		}

		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");

		if (!sfp) {
			fprintf(stderr, "nstat: fdopen failed: %s\n",
				strerror(errno));
			close(fd);
		} else {
			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();
		load_sctp_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) {
		if (ftruncate(fileno(hist_fp), 0) < 0)
			perror("nstat: ftruncate");
		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	30
fcc16c22	31	#include <json_writer.h>
aba5acdf	32	#include <SNAPSHOT.h>
62000e51	33	#include "utils.h"
aba5acdf	34
acd1e437 SH	35	int dump_zeros;
	36	int reset_history;
	37	int ignore_history;
	38	int no_output;
	39	int json_output;
acd1e437 SH	40	int no_update;
	41	int scan_interval;
	42	int time_constant;
aba5acdf SH	43	double W;
	44	char **patterns;
	45	int npatterns;
	46
	47	char info_source[128];
	48	int source_mismatch;
	49
4ffc44ca	50	static int generic_proc_open(const char env, char name)
aba5acdf SH	51	{
	52	char store[128];
	53	char *p = getenv(env);
acd1e437	54
aba5acdf SH	55	if (!p) {
	56	p = getenv("PROC_ROOT") ? : "/proc";
	57	snprintf(store, sizeof(store)-1, "%s/%s", p, name);
	58	p = store;
	59	}
4ffc44ca	60	return open(p, O_RDONLY);
aba5acdf SH	61	}
aba5acdf SH	62
d1f28cf1	63	static int net_netstat_open(void)
aba5acdf SH	64	{
	65	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
	66	}
	67
d1f28cf1	68	static int net_snmp_open(void)
aba5acdf SH	69	{
	70	return generic_proc_open("PROC_NET_SNMP", "net/snmp");
	71	}
	72
d1f28cf1	73	static int net_snmp6_open(void)
aba5acdf SH	74	{
	75	return generic_proc_open("PROC_NET_SNMP6", "net/snmp6");
	76	}
	77
45a0dc16 HL	78	static int net_sctp_snmp_open(void)
	79	{
	80	return generic_proc_open("PROC_NET_SCTP_SNMP", "net/sctp/snmp");
	81	}
	82
acd1e437	83	struct nstat_ent {
aba5acdf SH	84	struct nstat_ent *next;
	85	char *id;
	86	unsigned long long val;
aba5acdf SH	87	double rate;
	88	};
	89
	90	struct nstat_ent *kern_db;
	91	struct nstat_ent *hist_db;
	92
d1f28cf1 SH	93	static const char *useless_numbers[] = {
	94	"IpForwarding", "IpDefaultTTL",
	95	"TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax",
	96	"TcpMaxConn", "TcpCurrEstab"
aba5acdf SH	97	};
aba5acdf SH	98
d1f28cf1	99	static int useless_number(const char *id)
aba5acdf SH	100	{
aba5acdf SH	101	int i;
acd1e437	102
62000e51	103	for (i = 0; i < ARRAY_SIZE(useless_numbers); i++)
aba5acdf SH	104	if (strcmp(id, useless_numbers[i]) == 0)
	105	return 1;
	106	return 0;
	107	}
	108
d1f28cf1	109	static int match(const char *id)
aba5acdf SH	110	{
	111	int i;
	112
	113	if (npatterns == 0)
	114	return 1;
	115
acd1e437	116	for (i = 0; i < npatterns; i++) {
aba5acdf SH	117	if (!fnmatch(patterns[i], id, 0))
	118	return 1;
	119	}
	120	return 0;
	121	}
	122
d1f28cf1	123	static void load_good_table(FILE *fp)
aba5acdf SH	124	{
	125	char buf[4096];
	126	struct nstat_ent *db = NULL;
	127	struct nstat_ent *n;
	128
	129	while (fgets(buf, sizeof(buf), fp) != NULL) {
	130	int nr;
	131	unsigned long long val;
	132	double rate;
b482ffa6	133	char idbuf[sizeof(buf)];
acd1e437	134
aba5acdf SH	135	if (buf[0] == '#') {
	136	buf[strlen(buf)-1] = 0;
	137	if (info_source[0] && strcmp(info_source, buf+1))
	138	source_mismatch = 1;
b482ffa6	139	info_source[0] = 0;
b482ffa6	140	strncat(info_source, buf+1, sizeof(info_source)-1);
aba5acdf SH	141	continue;
aba5acdf SH	142	}
b482ffa6	143	/* idbuf is as big as buf, so this is safe */
aba5acdf SH	144	nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
	145	if (nr < 2)
	146	abort();
	147	if (nr < 3)
	148	rate = 0;
	149	if (useless_number(idbuf))
	150	continue;
	151	if ((n = malloc(sizeof(*n))) == NULL)
	152	abort();
	153	n->id = strdup(idbuf);
aba5acdf SH	154	n->val = val;
	155	n->rate = rate;
	156	n->next = db;
	157	db = n;
	158	}
	159
	160	while (db) {
	161	n = db;
	162	db = db->next;
	163	n->next = kern_db;
	164	kern_db = n;
	165	}
	166	}
	167
d4717914 ED	168	static int count_spaces(const char *line)
	169	{
	170	int count = 0;
	171	char c;
	172
	173	while ((c = *line++) != 0)
	174	count += c == ' ' \|\| c == '\n';
	175	return count;
	176	}
aba5acdf	177
d1f28cf1	178	static void load_ugly_table(FILE *fp)
aba5acdf	179	{
72cdb77d ED	180	char *buf = NULL;
	181	size_t buflen = 0;
	182	ssize_t nread;
aba5acdf SH	183	struct nstat_ent *db = NULL;
	184	struct nstat_ent *n;
	185
72cdb77d	186	while ((nread = getline(&buf, &buflen, fp)) != -1) {
da8034a0	187	char idbuf[4096];
aba5acdf SH	188	int off;
aba5acdf SH	189	char *p;
d4717914	190	int count1, count2, skip = 0;
aba5acdf SH	191
	192	p = strchr(buf, ':');
	193	if (!p)
	194	abort();
d4717914	195	count1 = count_spaces(buf);
aba5acdf	196	*p = 0;
b482ffa6	197	idbuf[0] = 0;
	198	strncat(idbuf, buf, sizeof(idbuf) - 1);
	199	off = p - buf;
aba5acdf SH	200	p += 2;
	201
	202	while (*p) {
	203	char *next;
acd1e437	204
aba5acdf SH	205	if ((next = strchr(p, ' ')) != NULL)
	206	*next++ = 0;
	207	else if ((next = strchr(p, '\n')) != NULL)
	208	*next++ = 0;
b482ffa6	209	if (off < sizeof(idbuf)) {
	210	idbuf[off] = 0;
	211	strncat(idbuf, p, sizeof(idbuf) - off - 1);
	212	}
aba5acdf SH	213	n = malloc(sizeof(*n));
	214	if (!n)
	215	abort();
	216	n->id = strdup(idbuf);
	217	n->rate = 0;
	218	n->next = db;
	219	db = n;
	220	p = next;
	221	}
	222	n = db;
72cdb77d ED	223	nread = getline(&buf, &buflen, fp);
72cdb77d ED	224	if (nread == -1)
aba5acdf	225	abort();
d4717914 ED	226	count2 = count_spaces(buf);
	227	if (count2 > count1)
	228	skip = count2 - count1;
aba5acdf SH	229	do {
	230	p = strrchr(buf, ' ');
	231	if (!p)
	232	abort();
	233	*p = 0;
cdb2227e	234	if (sscanf(p+1, "%llu", &n->val) != 1)
aba5acdf	235	abort();
aba5acdf	236	/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
d4717914 ED	237	if (skip)
d4717914 ED	238	skip--;
aba5acdf SH	239	else
	240	n = n->next;
	241	} while (p > buf + off + 2);
	242	}
72cdb77d	243	free(buf);
aba5acdf SH	244
	245	while (db) {
	246	n = db;
	247	db = db->next;
	248	if (useless_number(n->id)) {
	249	free(n->id);
	250	free(n);
	251	} else {
	252	n->next = kern_db;
	253	kern_db = n;
	254	}
	255	}
	256	}
	257
45a0dc16 HL	258	static void load_sctp_snmp(void)
	259	{
	260	FILE *fp = fdopen(net_sctp_snmp_open(), "r");
	261
	262	if (fp) {
	263	load_good_table(fp);
	264	fclose(fp);
	265	}
	266	}
	267
d1f28cf1	268	static void load_snmp(void)
aba5acdf SH	269	{
aba5acdf SH	270	FILE *fp = fdopen(net_snmp_open(), "r");
acd1e437	271
aba5acdf SH	272	if (fp) {
	273	load_ugly_table(fp);
	274	fclose(fp);
	275	}
	276	}
	277
d1f28cf1	278	static void load_snmp6(void)
aba5acdf SH	279	{
aba5acdf SH	280	FILE *fp = fdopen(net_snmp6_open(), "r");
acd1e437	281
aba5acdf SH	282	if (fp) {
	283	load_good_table(fp);
	284	fclose(fp);
	285	}
	286	}
	287
d1f28cf1	288	static void load_netstat(void)
aba5acdf SH	289	{
aba5acdf SH	290	FILE *fp = fdopen(net_netstat_open(), "r");
acd1e437	291
aba5acdf SH	292	if (fp) {
	293	load_ugly_table(fp);
	294	fclose(fp);
	295	}
	296	}
	297
d48ed3f4	298
d1f28cf1	299	static void dump_kern_db(FILE *fp, int to_hist)
aba5acdf	300	{
fcc16c22	301	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
aba5acdf	302	struct nstat_ent n, h;
d48ed3f4	303
aba5acdf	304	h = hist_db;
fcc16c22	305	if (jw) {
d721a145	306	jsonw_start_object(jw);
fcc16c22 SH	307	jsonw_pretty(jw, pretty);
	308	jsonw_name(jw, info_source);
	309	jsonw_start_object(jw);
	310	} else
d48ed3f4	311	fprintf(fp, "#%s\n", info_source);
404582c8	312
acd1e437	313	for (n = kern_db; n; n = n->next) {
aba5acdf	314	unsigned long long val = n->val;
acd1e437	315
aba5acdf SH	316	if (!dump_zeros && !val && !n->rate)
	317	continue;
	318	if (!match(n->id)) {
	319	struct nstat_ent *h1;
acd1e437	320
aba5acdf SH	321	if (!to_hist)
	322	continue;
	323	for (h1 = h; h1; h1 = h1->next) {
	324	if (strcmp(h1->id, n->id) == 0) {
	325	val = h1->val;
	326	h = h1->next;
	327	break;
	328	}
	329	}
	330	}
d48ed3f4	331
fcc16c22 SH	332	if (jw)
	333	jsonw_uint_field(jw, n->id, val);
	334	else
d48ed3f4	335	fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
aba5acdf	336	}
fcc16c22 SH	337
fcc16c22 SH	338	if (jw) {
d721a145 AK	339	jsonw_end_object(jw);
d721a145 AK	340
fcc16c22 SH	341	jsonw_end_object(jw);
	342	jsonw_destroy(&jw);
	343	}
aba5acdf SH	344	}
aba5acdf SH	345
d1f28cf1	346	static void dump_incr_db(FILE *fp)
aba5acdf	347	{
fcc16c22	348	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
aba5acdf	349	struct nstat_ent n, h;
d48ed3f4	350
aba5acdf	351	h = hist_db;
fcc16c22	352	if (jw) {
d721a145	353	jsonw_start_object(jw);
fcc16c22 SH	354	jsonw_pretty(jw, pretty);
	355	jsonw_name(jw, info_source);
	356	jsonw_start_object(jw);
	357	} else
d48ed3f4 SH	358	fprintf(fp, "#%s\n", info_source);
d48ed3f4 SH	359
acd1e437	360	for (n = kern_db; n; n = n->next) {
aba5acdf SH	361	int ovfl = 0;
	362	unsigned long long val = n->val;
	363	struct nstat_ent *h1;
acd1e437	364
aba5acdf SH	365	for (h1 = h; h1; h1 = h1->next) {
	366	if (strcmp(h1->id, n->id) == 0) {
	367	if (val < h1->val) {
	368	ovfl = 1;
	369	val = h1->val;
	370	}
	371	val -= h1->val;
	372	h = h1->next;
	373	break;
	374	}
	375	}
	376	if (!dump_zeros && !val && !n->rate)
	377	continue;
	378	if (!match(n->id))
	379	continue;
d48ed3f4	380
fcc16c22 SH	381	if (jw)
	382	jsonw_uint_field(jw, n->id, val);
	383	else
d48ed3f4 SH	384	fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
d48ed3f4 SH	385	n->rate, ovfl?" (overflow)":"");
aba5acdf	386	}
fcc16c22 SH	387
fcc16c22 SH	388	if (jw) {
d721a145 AK	389	jsonw_end_object(jw);
d721a145 AK	390
fcc16c22 SH	391	jsonw_end_object(jw);
	392	jsonw_destroy(&jw);
	393	}
aba5acdf SH	394	}
	395
	396	static int children;
	397
d1f28cf1	398	static void sigchild(int signo)
aba5acdf SH	399	{
	400	}
	401
d1f28cf1	402	static void update_db(int interval)
aba5acdf SH	403	{
	404	struct nstat_ent n, h;
	405
	406	n = kern_db;
	407	kern_db = NULL;
	408
	409	load_netstat();
	410	load_snmp6();
	411	load_snmp();
45a0dc16	412	load_sctp_snmp();
aba5acdf SH	413
	414	h = kern_db;
	415	kern_db = n;
	416
	417	for (n = kern_db; n; n = n->next) {
	418	struct nstat_ent *h1;
acd1e437	419
aba5acdf SH	420	for (h1 = h; h1; h1 = h1->next) {
	421	if (strcmp(h1->id, n->id) == 0) {
	422	double sample;
cdb2227e ED	423	unsigned long long incr = h1->val - n->val;
	424
	425	n->val = h1->val;
	426	sample = (double)incr * 1000.0 / interval;
aba5acdf SH	427	if (interval >= scan_interval) {
	428	n->rate += W*(sample-n->rate);
	429	} else if (interval >= 1000) {
	430	if (interval >= time_constant) {
	431	n->rate = sample;
	432	} else {
	433	double w = W*(double)interval/scan_interval;
acd1e437	434
aba5acdf SH	435	n->rate += w*(sample-n->rate);
	436	}
	437	}
	438
	439	while (h != h1) {
	440	struct nstat_ent *tmp = h;
acd1e437	441
aba5acdf SH	442	h = h->next;
	443	free(tmp->id);
	444	free(tmp);
	445	};
	446	h = h1->next;
	447	free(h1->id);
	448	free(h1);
	449	break;
	450	}
	451	}
	452	}
	453	}
	454
acd1e437	455	#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
aba5acdf SH	456
aba5acdf SH	457
d1f28cf1	458	static void server_loop(int fd)
aba5acdf	459	{
737f15f6	460	struct timeval snaptime = { 0 };
aba5acdf	461	struct pollfd p;
acd1e437	462
aba5acdf SH	463	p.fd = fd;
aba5acdf SH	464	p.events = p.revents = POLLIN;
ae665a52	465
aba5acdf SH	466	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
	467	getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
	468
	469	load_netstat();
	470	load_snmp6();
	471	load_snmp();
45a0dc16	472	load_sctp_snmp();
aba5acdf SH	473
	474	for (;;) {
	475	int status;
dd81ee04	476	time_t tdiff;
aba5acdf	477	struct timeval now;
acd1e437	478
aba5acdf SH	479	gettimeofday(&now, NULL);
	480	tdiff = T_DIFF(now, snaptime);
	481	if (tdiff >= scan_interval) {
	482	update_db(tdiff);
	483	snaptime = now;
	484	tdiff = 0;
	485	}
dd81ee04	486	if (poll(&p, 1, scan_interval - tdiff) > 0
aba5acdf SH	487	&& (p.revents&POLLIN)) {
aba5acdf SH	488	int clnt = accept(fd, NULL, NULL);
acd1e437	489
aba5acdf SH	490	if (clnt >= 0) {
aba5acdf SH	491	pid_t pid;
acd1e437	492
aba5acdf SH	493	if (children >= 5) {
	494	close(clnt);
	495	} else if ((pid = fork()) != 0) {
acd1e437	496	if (pid > 0)
aba5acdf SH	497	children++;
	498	close(clnt);
	499	} else {
	500	FILE *fp = fdopen(clnt, "w");
acd1e437	501
dd81ee04	502	if (fp)
aba5acdf	503	dump_kern_db(fp, 0);
aba5acdf SH	504	exit(0);
	505	}
	506	}
	507	}
	508	while (children && waitpid(-1, &status, WNOHANG) > 0)
	509	children--;
	510	}
	511	}
	512
d1f28cf1	513	static int verify_forging(int fd)
aba5acdf SH	514	{
aba5acdf SH	515	struct ucred cred;
737f15f6 SH	516	socklen_t olen = sizeof(cred);
737f15f6 SH	517
acd1e437	518	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) \|\|
aba5acdf SH	519	olen < sizeof(cred))
	520	return -1;
	521	if (cred.uid == getuid() \|\| cred.uid == 0)
	522	return 0;
	523	return -1;
	524	}
	525
	526	static void usage(void) __attribute__((noreturn));
	527
	528	static void usage(void)
	529	{
	530	fprintf(stderr,
8589eb4e MC	531	"Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
	532	" -h, --help this message\n"
	533	" -a, --ignore ignore history\n"
	534	" -d, --scan=SECS sample every statistics every SECS\n"
	535	" -j, --json format output in JSON\n"
	536	" -n, --nooutput do history only\n"
	537	" -p, --pretty pretty print\n"
	538	" -r, --reset reset history\n"
	539	" -s, --noupdate don't update history\n"
	540	" -t, --interval=SECS report average over the last SECS\n"
	541	" -V, --version output version information\n"
	542	" -z, --zeros show entries with zero activity\n");
aba5acdf SH	543	exit(-1);
	544	}
	545
404582c8 SH	546	static const struct option longopts[] = {
	547	{ "help", 0, 0, 'h' },
	548	{ "ignore", 0, 0, 'a' },
	549	{ "scan", 1, 0, 'd'},
	550	{ "nooutput", 0, 0, 'n' },
	551	{ "json", 0, 0, 'j' },
	552	{ "reset", 0, 0, 'r' },
	553	{ "noupdate", 0, 0, 's' },
fcc16c22	554	{ "pretty", 0, 0, 'p' },
404582c8 SH	555	{ "interval", 1, 0, 't' },
	556	{ "version", 0, 0, 'V' },
	557	{ "zeros", 0, 0, 'z' },
	558	{ 0 }
	559	};
aba5acdf SH	560
	561	int main(int argc, char *argv[])
	562	{
896ebd6c	563	char *hist_name;
aba5acdf SH	564	struct sockaddr_un sun;
	565	FILE *hist_fp = NULL;
	566	int ch;
	567	int fd;
	568
fcc16c22	569	while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:jp",
404582c8	570	longopts, NULL)) != EOF) {
acd1e437	571	switch (ch) {
aba5acdf SH	572	case 'z':
	573	dump_zeros = 1;
	574	break;
	575	case 'r':
	576	reset_history = 1;
	577	break;
	578	case 'a':
	579	ignore_history = 1;
	580	break;
	581	case 's':
	582	no_update = 1;
	583	break;
	584	case 'n':
	585	no_output = 1;
	586	break;
	587	case 'd':
	588	scan_interval = 1000*atoi(optarg);
	589	break;
	590	case 't':
	591	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	592	time_constant <= 0) {
	593	fprintf(stderr, "nstat: invalid time constant divisor\n");
	594	exit(-1);
	595	}
	596	break;
d48ed3f4 SH	597	case 'j':
	598	json_output = 1;
	599	break;
fcc16c22 SH	600	case 'p':
	601	pretty = 1;
	602	break;
aba5acdf SH	603	case 'v':
	604	case 'V':
	605	printf("nstat utility, iproute2-ss%s\n", SNAPSHOT);
	606	exit(0);
	607	case 'h':
	608	case '?':
	609	default:
	610	usage();
	611	}
	612	}
	613
	614	argc -= optind;
	615	argv += optind;
	616
	617	sun.sun_family = AF_UNIX;
	618	sun.sun_path[0] = 0;
	619	sprintf(sun.sun_path+1, "nstat%d", getuid());
	620
	621	if (scan_interval > 0) {
	622	if (time_constant == 0)
	623	time_constant = 60;
	624	time_constant *= 1000;
	625	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
	626	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	627	perror("nstat: socket");
	628	exit(-1);
	629	}
acd1e437	630	if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
aba5acdf SH	631	perror("nstat: bind");
	632	exit(-1);
	633	}
	634	if (listen(fd, 5) < 0) {
	635	perror("nstat: listen");
	636	exit(-1);
	637	}
a7a9ddbb MF	638	if (daemon(0, 0)) {
	639	perror("nstat: daemon");
	640	exit(-1);
	641	}
aba5acdf SH	642	signal(SIGPIPE, SIG_IGN);
	643	signal(SIGCHLD, sigchild);
	644	server_loop(fd);
	645	exit(0);
	646	}
	647
	648	patterns = argv;
	649	npatterns = argc;
	650
896ebd6c SH	651	if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) {
896ebd6c SH	652	hist_name = malloc(128);
aba5acdf	653	sprintf(hist_name, "/tmp/.nstat.u%d", getuid());
896ebd6c	654	}
aba5acdf SH	655
	656	if (reset_history)
	657	unlink(hist_name);
	658
	659	if (!ignore_history \|\| !no_update) {
	660	struct stat stb;
	661
	662	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	663	if (fd < 0) {
	664	perror("nstat: open history file");
	665	exit(-1);
	666	}
	667	if ((hist_fp = fdopen(fd, "r+")) == NULL) {
	668	perror("nstat: fdopen history file");
	669	exit(-1);
	670	}
	671	if (flock(fileno(hist_fp), LOCK_EX)) {
	672	perror("nstat: flock history file");
	673	exit(-1);
	674	}
	675	if (fstat(fileno(hist_fp), &stb) != 0) {
	676	perror("nstat: fstat history file");
	677	exit(-1);
	678	}
	679	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	680	fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n");
	681	exit(-1);
	682	}
	683	if (!ignore_history) {
	684	FILE *tfp;
9a230771	685	long uptime = -1;
acd1e437	686
aba5acdf SH	687	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	688	if (fscanf(tfp, "%ld", &uptime) != 1)
	689	uptime = -1;
	690	fclose(tfp);
	691	}
	692	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	693	fprintf(stderr, "nstat: history is aged out, resetting\n");
d572ed4d PS	694	if (ftruncate(fileno(hist_fp), 0) < 0)
d572ed4d PS	695	perror("nstat: ftruncate");
aba5acdf SH	696	}
	697	}
	698
	699	load_good_table(hist_fp);
	700
	701	hist_db = kern_db;
	702	kern_db = NULL;
	703	}
	704
	705	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
acd1e437	706	(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
aba5acdf	707	\|\| (strcpy(sun.sun_path+1, "nstat0"),
acd1e437	708	connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
aba5acdf SH	709	&& verify_forging(fd) == 0) {
aba5acdf SH	710	FILE *sfp = fdopen(fd, "r");
acd1e437	711
6d02518f PS	712	if (!sfp) {
	713	fprintf(stderr, "nstat: fdopen failed: %s\n",
	714	strerror(errno));
	715	close(fd);
	716	} else {
	717	load_good_table(sfp);
	718	if (hist_db && source_mismatch) {
	719	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	720	hist_db = NULL;
	721	}
	722	fclose(sfp);
aba5acdf	723	}
aba5acdf SH	724	} else {
	725	if (fd >= 0)
	726	close(fd);
	727	if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
	728	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	729	hist_db = NULL;
	730	info_source[0] = 0;
	731	}
	732	load_netstat();
	733	load_snmp6();
	734	load_snmp();
45a0dc16	735	load_sctp_snmp();
aba5acdf SH	736	if (info_source[0] == 0)
	737	strcpy(info_source, "kernel");
	738	}
	739
	740	if (!no_output) {
	741	if (ignore_history \|\| hist_db == NULL)
	742	dump_kern_db(stdout, 0);
	743	else
	744	dump_incr_db(stdout);
	745	}
	746	if (!no_update) {
d572ed4d PS	747	if (ftruncate(fileno(hist_fp), 0) < 0)
d572ed4d PS	748	perror("nstat: ftruncate");
aba5acdf	749	rewind(hist_fp);
404582c8 SH	750
404582c8 SH	751	json_output = 0;
aba5acdf	752	dump_kern_db(hist_fp, 1);
404582c8	753	fclose(hist_fp);
aba5acdf SH	754	}
	755	exit(0);
	756	}