[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 pretty;
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[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_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;
	40	int pretty;
	41	int no_update;
	42	int scan_interval;
	43	int time_constant;
aba5acdf SH	44	double W;
	45	char **patterns;
	46	int npatterns;
	47
	48	char info_source[128];
	49	int source_mismatch;
	50
4ffc44ca	51	static int generic_proc_open(const char env, char name)
aba5acdf SH	52	{
	53	char store[128];
	54	char *p = getenv(env);
acd1e437	55
aba5acdf SH	56	if (!p) {
	57	p = getenv("PROC_ROOT") ? : "/proc";
	58	snprintf(store, sizeof(store)-1, "%s/%s", p, name);
	59	p = store;
	60	}
4ffc44ca	61	return open(p, O_RDONLY);
aba5acdf SH	62	}
aba5acdf SH	63
d1f28cf1	64	static int net_netstat_open(void)
aba5acdf SH	65	{
	66	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
	67	}
	68
d1f28cf1	69	static int net_snmp_open(void)
aba5acdf SH	70	{
	71	return generic_proc_open("PROC_NET_SNMP", "net/snmp");
	72	}
	73
d1f28cf1	74	static int net_snmp6_open(void)
aba5acdf SH	75	{
	76	return generic_proc_open("PROC_NET_SNMP6", "net/snmp6");
	77	}
	78
45a0dc16 HL	79	static int net_sctp_snmp_open(void)
	80	{
	81	return generic_proc_open("PROC_NET_SCTP_SNMP", "net/sctp/snmp");
	82	}
	83
acd1e437	84	struct nstat_ent {
aba5acdf SH	85	struct nstat_ent *next;
	86	char *id;
	87	unsigned long long val;
aba5acdf SH	88	double rate;
	89	};
	90
	91	struct nstat_ent *kern_db;
	92	struct nstat_ent *hist_db;
	93
d1f28cf1 SH	94	static const char *useless_numbers[] = {
	95	"IpForwarding", "IpDefaultTTL",
	96	"TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax",
	97	"TcpMaxConn", "TcpCurrEstab"
aba5acdf SH	98	};
aba5acdf SH	99
d1f28cf1	100	static int useless_number(const char *id)
aba5acdf SH	101	{
aba5acdf SH	102	int i;
acd1e437	103
62000e51	104	for (i = 0; i < ARRAY_SIZE(useless_numbers); i++)
aba5acdf SH	105	if (strcmp(id, useless_numbers[i]) == 0)
	106	return 1;
	107	return 0;
	108	}
	109
d1f28cf1	110	static int match(const char *id)
aba5acdf SH	111	{
	112	int i;
	113
	114	if (npatterns == 0)
	115	return 1;
	116
acd1e437	117	for (i = 0; i < npatterns; i++) {
aba5acdf SH	118	if (!fnmatch(patterns[i], id, 0))
	119	return 1;
	120	}
	121	return 0;
	122	}
	123
d1f28cf1	124	static void load_good_table(FILE *fp)
aba5acdf SH	125	{
	126	char buf[4096];
	127	struct nstat_ent *db = NULL;
	128	struct nstat_ent *n;
	129
	130	while (fgets(buf, sizeof(buf), fp) != NULL) {
	131	int nr;
	132	unsigned long long val;
	133	double rate;
b482ffa6	134	char idbuf[sizeof(buf)];
acd1e437	135
aba5acdf SH	136	if (buf[0] == '#') {
	137	buf[strlen(buf)-1] = 0;
	138	if (info_source[0] && strcmp(info_source, buf+1))
	139	source_mismatch = 1;
b482ffa6	140	info_source[0] = 0;
b482ffa6	141	strncat(info_source, buf+1, sizeof(info_source)-1);
aba5acdf SH	142	continue;
aba5acdf SH	143	}
b482ffa6	144	/* idbuf is as big as buf, so this is safe */
aba5acdf SH	145	nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
	146	if (nr < 2)
	147	abort();
	148	if (nr < 3)
	149	rate = 0;
	150	if (useless_number(idbuf))
	151	continue;
	152	if ((n = malloc(sizeof(*n))) == NULL)
	153	abort();
	154	n->id = strdup(idbuf);
aba5acdf SH	155	n->val = val;
	156	n->rate = rate;
	157	n->next = db;
	158	db = n;
	159	}
	160
	161	while (db) {
	162	n = db;
	163	db = db->next;
	164	n->next = kern_db;
	165	kern_db = n;
	166	}
	167	}
	168
d4717914 ED	169	static int count_spaces(const char *line)
	170	{
	171	int count = 0;
	172	char c;
	173
	174	while ((c = *line++) != 0)
	175	count += c == ' ' \|\| c == '\n';
	176	return count;
	177	}
aba5acdf	178
d1f28cf1	179	static void load_ugly_table(FILE *fp)
aba5acdf SH	180	{
	181	char buf[4096];
	182	struct nstat_ent *db = NULL;
	183	struct nstat_ent *n;
	184
	185	while (fgets(buf, sizeof(buf), fp) != NULL) {
b482ffa6	186	char idbuf[sizeof(buf)];
aba5acdf SH	187	int off;
aba5acdf SH	188	char *p;
d4717914	189	int count1, count2, skip = 0;
aba5acdf SH	190
	191	p = strchr(buf, ':');
	192	if (!p)
	193	abort();
d4717914	194	count1 = count_spaces(buf);
aba5acdf	195	*p = 0;
b482ffa6	196	idbuf[0] = 0;
	197	strncat(idbuf, buf, sizeof(idbuf) - 1);
	198	off = p - buf;
aba5acdf SH	199	p += 2;
	200
	201	while (*p) {
	202	char *next;
acd1e437	203
aba5acdf SH	204	if ((next = strchr(p, ' ')) != NULL)
	205	*next++ = 0;
	206	else if ((next = strchr(p, '\n')) != NULL)
	207	*next++ = 0;
b482ffa6	208	if (off < sizeof(idbuf)) {
	209	idbuf[off] = 0;
	210	strncat(idbuf, p, sizeof(idbuf) - off - 1);
	211	}
aba5acdf SH	212	n = malloc(sizeof(*n));
	213	if (!n)
	214	abort();
	215	n->id = strdup(idbuf);
	216	n->rate = 0;
	217	n->next = db;
	218	db = n;
	219	p = next;
	220	}
	221	n = db;
	222	if (fgets(buf, sizeof(buf), fp) == NULL)
	223	abort();
d4717914 ED	224	count2 = count_spaces(buf);
	225	if (count2 > count1)
	226	skip = count2 - count1;
aba5acdf SH	227	do {
	228	p = strrchr(buf, ' ');
	229	if (!p)
	230	abort();
	231	*p = 0;
cdb2227e	232	if (sscanf(p+1, "%llu", &n->val) != 1)
aba5acdf	233	abort();
aba5acdf	234	/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
d4717914 ED	235	if (skip)
d4717914 ED	236	skip--;
aba5acdf SH	237	else
	238	n = n->next;
	239	} while (p > buf + off + 2);
	240	}
	241
	242	while (db) {
	243	n = db;
	244	db = db->next;
	245	if (useless_number(n->id)) {
	246	free(n->id);
	247	free(n);
	248	} else {
	249	n->next = kern_db;
	250	kern_db = n;
	251	}
	252	}
	253	}
	254
45a0dc16 HL	255	static void load_sctp_snmp(void)
	256	{
	257	FILE *fp = fdopen(net_sctp_snmp_open(), "r");
	258
	259	if (fp) {
	260	load_good_table(fp);
	261	fclose(fp);
	262	}
	263	}
	264
d1f28cf1	265	static void load_snmp(void)
aba5acdf SH	266	{
aba5acdf SH	267	FILE *fp = fdopen(net_snmp_open(), "r");
acd1e437	268
aba5acdf SH	269	if (fp) {
	270	load_ugly_table(fp);
	271	fclose(fp);
	272	}
	273	}
	274
d1f28cf1	275	static void load_snmp6(void)
aba5acdf SH	276	{
aba5acdf SH	277	FILE *fp = fdopen(net_snmp6_open(), "r");
acd1e437	278
aba5acdf SH	279	if (fp) {
	280	load_good_table(fp);
	281	fclose(fp);
	282	}
	283	}
	284
d1f28cf1	285	static void load_netstat(void)
aba5acdf SH	286	{
aba5acdf SH	287	FILE *fp = fdopen(net_netstat_open(), "r");
acd1e437	288
aba5acdf SH	289	if (fp) {
	290	load_ugly_table(fp);
	291	fclose(fp);
	292	}
	293	}
	294
d48ed3f4	295
d1f28cf1	296	static void dump_kern_db(FILE *fp, int to_hist)
aba5acdf	297	{
fcc16c22	298	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
aba5acdf	299	struct nstat_ent n, h;
d48ed3f4	300
aba5acdf	301	h = hist_db;
fcc16c22	302	if (jw) {
d721a145	303	jsonw_start_object(jw);
fcc16c22 SH	304	jsonw_pretty(jw, pretty);
	305	jsonw_name(jw, info_source);
	306	jsonw_start_object(jw);
	307	} else
d48ed3f4	308	fprintf(fp, "#%s\n", info_source);
404582c8	309
acd1e437	310	for (n = kern_db; n; n = n->next) {
aba5acdf	311	unsigned long long val = n->val;
acd1e437	312
aba5acdf SH	313	if (!dump_zeros && !val && !n->rate)
	314	continue;
	315	if (!match(n->id)) {
	316	struct nstat_ent *h1;
acd1e437	317
aba5acdf SH	318	if (!to_hist)
	319	continue;
	320	for (h1 = h; h1; h1 = h1->next) {
	321	if (strcmp(h1->id, n->id) == 0) {
	322	val = h1->val;
	323	h = h1->next;
	324	break;
	325	}
	326	}
	327	}
d48ed3f4	328
fcc16c22 SH	329	if (jw)
	330	jsonw_uint_field(jw, n->id, val);
	331	else
d48ed3f4	332	fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
aba5acdf	333	}
fcc16c22 SH	334
fcc16c22 SH	335	if (jw) {
d721a145 AK	336	jsonw_end_object(jw);
d721a145 AK	337
fcc16c22 SH	338	jsonw_end_object(jw);
	339	jsonw_destroy(&jw);
	340	}
aba5acdf SH	341	}
aba5acdf SH	342
d1f28cf1	343	static void dump_incr_db(FILE *fp)
aba5acdf	344	{
fcc16c22	345	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
aba5acdf	346	struct nstat_ent n, h;
d48ed3f4	347
aba5acdf	348	h = hist_db;
fcc16c22	349	if (jw) {
d721a145	350	jsonw_start_object(jw);
fcc16c22 SH	351	jsonw_pretty(jw, pretty);
	352	jsonw_name(jw, info_source);
	353	jsonw_start_object(jw);
	354	} else
d48ed3f4 SH	355	fprintf(fp, "#%s\n", info_source);
d48ed3f4 SH	356
acd1e437	357	for (n = kern_db; n; n = n->next) {
aba5acdf SH	358	int ovfl = 0;
	359	unsigned long long val = n->val;
	360	struct nstat_ent *h1;
acd1e437	361
aba5acdf SH	362	for (h1 = h; h1; h1 = h1->next) {
	363	if (strcmp(h1->id, n->id) == 0) {
	364	if (val < h1->val) {
	365	ovfl = 1;
	366	val = h1->val;
	367	}
	368	val -= h1->val;
	369	h = h1->next;
	370	break;
	371	}
	372	}
	373	if (!dump_zeros && !val && !n->rate)
	374	continue;
	375	if (!match(n->id))
	376	continue;
d48ed3f4	377
fcc16c22 SH	378	if (jw)
	379	jsonw_uint_field(jw, n->id, val);
	380	else
d48ed3f4 SH	381	fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
d48ed3f4 SH	382	n->rate, ovfl?" (overflow)":"");
aba5acdf	383	}
fcc16c22 SH	384
fcc16c22 SH	385	if (jw) {
d721a145 AK	386	jsonw_end_object(jw);
d721a145 AK	387
fcc16c22 SH	388	jsonw_end_object(jw);
	389	jsonw_destroy(&jw);
	390	}
aba5acdf SH	391	}
	392
	393	static int children;
	394
d1f28cf1	395	static void sigchild(int signo)
aba5acdf SH	396	{
	397	}
	398
d1f28cf1	399	static void update_db(int interval)
aba5acdf SH	400	{
	401	struct nstat_ent n, h;
	402
	403	n = kern_db;
	404	kern_db = NULL;
	405
	406	load_netstat();
	407	load_snmp6();
	408	load_snmp();
45a0dc16	409	load_sctp_snmp();
aba5acdf SH	410
	411	h = kern_db;
	412	kern_db = n;
	413
	414	for (n = kern_db; n; n = n->next) {
	415	struct nstat_ent *h1;
acd1e437	416
aba5acdf SH	417	for (h1 = h; h1; h1 = h1->next) {
	418	if (strcmp(h1->id, n->id) == 0) {
	419	double sample;
cdb2227e ED	420	unsigned long long incr = h1->val - n->val;
	421
	422	n->val = h1->val;
	423	sample = (double)incr * 1000.0 / interval;
aba5acdf SH	424	if (interval >= scan_interval) {
	425	n->rate += W*(sample-n->rate);
	426	} else if (interval >= 1000) {
	427	if (interval >= time_constant) {
	428	n->rate = sample;
	429	} else {
	430	double w = W*(double)interval/scan_interval;
acd1e437	431
aba5acdf SH	432	n->rate += w*(sample-n->rate);
	433	}
	434	}
	435
	436	while (h != h1) {
	437	struct nstat_ent *tmp = h;
acd1e437	438
aba5acdf SH	439	h = h->next;
	440	free(tmp->id);
	441	free(tmp);
	442	};
	443	h = h1->next;
	444	free(h1->id);
	445	free(h1);
	446	break;
	447	}
	448	}
	449	}
	450	}
	451
acd1e437	452	#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
aba5acdf SH	453
aba5acdf SH	454
d1f28cf1	455	static void server_loop(int fd)
aba5acdf	456	{
737f15f6	457	struct timeval snaptime = { 0 };
aba5acdf	458	struct pollfd p;
acd1e437	459
aba5acdf SH	460	p.fd = fd;
aba5acdf SH	461	p.events = p.revents = POLLIN;
ae665a52	462
aba5acdf SH	463	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
	464	getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
	465
	466	load_netstat();
	467	load_snmp6();
	468	load_snmp();
45a0dc16	469	load_sctp_snmp();
aba5acdf SH	470
	471	for (;;) {
	472	int status;
dd81ee04	473	time_t tdiff;
aba5acdf	474	struct timeval now;
acd1e437	475
aba5acdf SH	476	gettimeofday(&now, NULL);
	477	tdiff = T_DIFF(now, snaptime);
	478	if (tdiff >= scan_interval) {
	479	update_db(tdiff);
	480	snaptime = now;
	481	tdiff = 0;
	482	}
dd81ee04	483	if (poll(&p, 1, scan_interval - tdiff) > 0
aba5acdf SH	484	&& (p.revents&POLLIN)) {
aba5acdf SH	485	int clnt = accept(fd, NULL, NULL);
acd1e437	486
aba5acdf SH	487	if (clnt >= 0) {
aba5acdf SH	488	pid_t pid;
acd1e437	489
aba5acdf SH	490	if (children >= 5) {
	491	close(clnt);
	492	} else if ((pid = fork()) != 0) {
acd1e437	493	if (pid > 0)
aba5acdf SH	494	children++;
	495	close(clnt);
	496	} else {
	497	FILE *fp = fdopen(clnt, "w");
acd1e437	498
dd81ee04	499	if (fp)
aba5acdf	500	dump_kern_db(fp, 0);
aba5acdf SH	501	exit(0);
	502	}
	503	}
	504	}
	505	while (children && waitpid(-1, &status, WNOHANG) > 0)
	506	children--;
	507	}
	508	}
	509
d1f28cf1	510	static int verify_forging(int fd)
aba5acdf SH	511	{
aba5acdf SH	512	struct ucred cred;
737f15f6 SH	513	socklen_t olen = sizeof(cred);
737f15f6 SH	514
acd1e437	515	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) \|\|
aba5acdf SH	516	olen < sizeof(cred))
	517	return -1;
	518	if (cred.uid == getuid() \|\| cred.uid == 0)
	519	return 0;
	520	return -1;
	521	}
	522
	523	static void usage(void) __attribute__((noreturn));
	524
	525	static void usage(void)
	526	{
	527	fprintf(stderr,
404582c8	528	"Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
eca7a742 MF	529	" -h, --help this message\n"
	530	" -a, --ignore ignore history\n"
	531	" -d, --scan=SECS sample every statistics every SECS\n"
	532	" -j, --json format output in JSON\n"
	533	" -n, --nooutput do history only\n"
	534	" -p, --pretty pretty print\n"
	535	" -r, --reset reset history\n"
	536	" -s, --noupdate don't update history\n"
	537	" -t, --interval=SECS report average over the last SECS\n"
	538	" -V, --version output version information\n"
	539	" -z, --zeros show entries with zero activity\n");
aba5acdf SH	540	exit(-1);
	541	}
	542
404582c8 SH	543	static const struct option longopts[] = {
	544	{ "help", 0, 0, 'h' },
	545	{ "ignore", 0, 0, 'a' },
	546	{ "scan", 1, 0, 'd'},
	547	{ "nooutput", 0, 0, 'n' },
	548	{ "json", 0, 0, 'j' },
	549	{ "reset", 0, 0, 'r' },
	550	{ "noupdate", 0, 0, 's' },
fcc16c22	551	{ "pretty", 0, 0, 'p' },
404582c8 SH	552	{ "interval", 1, 0, 't' },
	553	{ "version", 0, 0, 'V' },
	554	{ "zeros", 0, 0, 'z' },
	555	{ 0 }
	556	};
aba5acdf SH	557
	558	int main(int argc, char *argv[])
	559	{
896ebd6c	560	char *hist_name;
aba5acdf SH	561	struct sockaddr_un sun;
	562	FILE *hist_fp = NULL;
	563	int ch;
	564	int fd;
	565
fcc16c22	566	while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:jp",
404582c8	567	longopts, NULL)) != EOF) {
acd1e437	568	switch (ch) {
aba5acdf SH	569	case 'z':
	570	dump_zeros = 1;
	571	break;
	572	case 'r':
	573	reset_history = 1;
	574	break;
	575	case 'a':
	576	ignore_history = 1;
	577	break;
	578	case 's':
	579	no_update = 1;
	580	break;
	581	case 'n':
	582	no_output = 1;
	583	break;
	584	case 'd':
	585	scan_interval = 1000*atoi(optarg);
	586	break;
	587	case 't':
	588	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	589	time_constant <= 0) {
	590	fprintf(stderr, "nstat: invalid time constant divisor\n");
	591	exit(-1);
	592	}
	593	break;
d48ed3f4 SH	594	case 'j':
	595	json_output = 1;
	596	break;
fcc16c22 SH	597	case 'p':
	598	pretty = 1;
	599	break;
aba5acdf SH	600	case 'v':
	601	case 'V':
	602	printf("nstat utility, iproute2-ss%s\n", SNAPSHOT);
	603	exit(0);
	604	case 'h':
	605	case '?':
	606	default:
	607	usage();
	608	}
	609	}
	610
	611	argc -= optind;
	612	argv += optind;
	613
	614	sun.sun_family = AF_UNIX;
	615	sun.sun_path[0] = 0;
	616	sprintf(sun.sun_path+1, "nstat%d", getuid());
	617
	618	if (scan_interval > 0) {
	619	if (time_constant == 0)
	620	time_constant = 60;
	621	time_constant *= 1000;
	622	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
	623	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	624	perror("nstat: socket");
	625	exit(-1);
	626	}
acd1e437	627	if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
aba5acdf SH	628	perror("nstat: bind");
	629	exit(-1);
	630	}
	631	if (listen(fd, 5) < 0) {
	632	perror("nstat: listen");
	633	exit(-1);
	634	}
a7a9ddbb MF	635	if (daemon(0, 0)) {
	636	perror("nstat: daemon");
	637	exit(-1);
	638	}
aba5acdf SH	639	signal(SIGPIPE, SIG_IGN);
	640	signal(SIGCHLD, sigchild);
	641	server_loop(fd);
	642	exit(0);
	643	}
	644
	645	patterns = argv;
	646	npatterns = argc;
	647
896ebd6c SH	648	if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) {
896ebd6c SH	649	hist_name = malloc(128);
aba5acdf	650	sprintf(hist_name, "/tmp/.nstat.u%d", getuid());
896ebd6c	651	}
aba5acdf SH	652
	653	if (reset_history)
	654	unlink(hist_name);
	655
	656	if (!ignore_history \|\| !no_update) {
	657	struct stat stb;
	658
	659	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	660	if (fd < 0) {
	661	perror("nstat: open history file");
	662	exit(-1);
	663	}
	664	if ((hist_fp = fdopen(fd, "r+")) == NULL) {
	665	perror("nstat: fdopen history file");
	666	exit(-1);
	667	}
	668	if (flock(fileno(hist_fp), LOCK_EX)) {
	669	perror("nstat: flock history file");
	670	exit(-1);
	671	}
	672	if (fstat(fileno(hist_fp), &stb) != 0) {
	673	perror("nstat: fstat history file");
	674	exit(-1);
	675	}
	676	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	677	fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n");
	678	exit(-1);
	679	}
	680	if (!ignore_history) {
	681	FILE *tfp;
9a230771	682	long uptime = -1;
acd1e437	683
aba5acdf SH	684	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	685	if (fscanf(tfp, "%ld", &uptime) != 1)
	686	uptime = -1;
	687	fclose(tfp);
	688	}
	689	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	690	fprintf(stderr, "nstat: history is aged out, resetting\n");
d572ed4d PS	691	if (ftruncate(fileno(hist_fp), 0) < 0)
d572ed4d PS	692	perror("nstat: ftruncate");
aba5acdf SH	693	}
	694	}
	695
	696	load_good_table(hist_fp);
	697
	698	hist_db = kern_db;
	699	kern_db = NULL;
	700	}
	701
	702	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
acd1e437	703	(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
aba5acdf	704	\|\| (strcpy(sun.sun_path+1, "nstat0"),
acd1e437	705	connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
aba5acdf SH	706	&& verify_forging(fd) == 0) {
aba5acdf SH	707	FILE *sfp = fdopen(fd, "r");
acd1e437	708
6d02518f PS	709	if (!sfp) {
	710	fprintf(stderr, "nstat: fdopen failed: %s\n",
	711	strerror(errno));
	712	close(fd);
	713	} else {
	714	load_good_table(sfp);
	715	if (hist_db && source_mismatch) {
	716	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	717	hist_db = NULL;
	718	}
	719	fclose(sfp);
aba5acdf	720	}
aba5acdf SH	721	} else {
	722	if (fd >= 0)
	723	close(fd);
	724	if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
	725	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	726	hist_db = NULL;
	727	info_source[0] = 0;
	728	}
	729	load_netstat();
	730	load_snmp6();
	731	load_snmp();
45a0dc16	732	load_sctp_snmp();
aba5acdf SH	733	if (info_source[0] == 0)
	734	strcpy(info_source, "kernel");
	735	}
	736
	737	if (!no_output) {
	738	if (ignore_history \|\| hist_db == NULL)
	739	dump_kern_db(stdout, 0);
	740	else
	741	dump_incr_db(stdout);
	742	}
	743	if (!no_update) {
d572ed4d PS	744	if (ftruncate(fileno(hist_fp), 0) < 0)
d572ed4d PS	745	perror("nstat: ftruncate");
aba5acdf	746	rewind(hist_fp);
404582c8 SH	747
404582c8 SH	748	json_output = 0;
aba5acdf	749	dump_kern_db(hist_fp, 1);
404582c8	750	fclose(hist_fp);
aba5acdf SH	751	}
	752	exit(0);
	753	}