[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 "version.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, FNM_CASEFOLD))
			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;
			strlcpy(info_source, buf + 1, sizeof(info_source));
			continue;
		}
		/* idbuf is as big as buf, so this is safe */
		nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
		if (nr < 2) {
			fprintf(stderr, "%s:%d: error parsing history file\n",
				__FILE__, __LINE__);
			exit(-2);
		}
		if (nr < 3)
			rate = 0;
		if (useless_number(idbuf))
			continue;
		if ((n = malloc(sizeof(*n))) == NULL) {
			perror("nstat: malloc");
			exit(-1);
		}
		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) {
			fprintf(stderr, "%s:%d: error parsing history file\n",
				__FILE__, __LINE__);
			exit(-2);
		}
		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) {
				perror("nstat: malloc");
				exit(-1);
			}
			n->id = strdup(idbuf);
			n->rate = 0;
			n->next = db;
			db = n;
			p = next;
		}
		n = db;
		nread = getline(&buf, &buflen, fp);
		if (nread == -1) {
			fprintf(stderr, "%s:%d: error parsing history file\n",
				__FILE__, __LINE__);
			exit(-2);
		}
		count2 = count_spaces(buf);
		if (count2 > count1)
			skip = count2 - count1;
		do {
			p = strrchr(buf, ' ');
			if (!p) {
				fprintf(stderr, "%s:%d: error parsing history file\n",
					__FILE__, __LINE__);
				exit(-2);
			}
			*p = 0;
			if (sscanf(p+1, "%llu", &n->val) != 1) {
				fprintf(stderr, "%s:%d: error parsing history file\n",
					__FILE__, __LINE__);
				exit(-2);
			}
			/* 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-%s\n", version);
			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>
fbef6555	32	#include "version.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++) {
8f5a602f	117	if (!fnmatch(patterns[i], id, FNM_CASEFOLD))
aba5acdf SH	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;
c0149839	139	strlcpy(info_source, buf + 1, sizeof(info_source));
aba5acdf SH	140	continue;
aba5acdf SH	141	}
b482ffa6	142	/* idbuf is as big as buf, so this is safe */
aba5acdf	143	nr = sscanf(buf, "%s%llu%lg", idbuf, &val, &rate);
2c7056ac AC	144	if (nr < 2) {
	145	fprintf(stderr, "%s:%d: error parsing history file\n",
	146	__FILE__, __LINE__);
	147	exit(-2);
	148	}
aba5acdf SH	149	if (nr < 3)
	150	rate = 0;
	151	if (useless_number(idbuf))
	152	continue;
2c7056ac AC	153	if ((n = malloc(sizeof(*n))) == NULL) {
	154	perror("nstat: malloc");
	155	exit(-1);
	156	}
aba5acdf	157	n->id = strdup(idbuf);
aba5acdf SH	158	n->val = val;
	159	n->rate = rate;
	160	n->next = db;
	161	db = n;
	162	}
	163
	164	while (db) {
	165	n = db;
	166	db = db->next;
	167	n->next = kern_db;
	168	kern_db = n;
	169	}
	170	}
	171
d4717914 ED	172	static int count_spaces(const char *line)
	173	{
	174	int count = 0;
	175	char c;
	176
	177	while ((c = *line++) != 0)
	178	count += c == ' ' \|\| c == '\n';
	179	return count;
	180	}
aba5acdf	181
d1f28cf1	182	static void load_ugly_table(FILE *fp)
aba5acdf	183	{
72cdb77d ED	184	char *buf = NULL;
	185	size_t buflen = 0;
	186	ssize_t nread;
aba5acdf SH	187	struct nstat_ent *db = NULL;
	188	struct nstat_ent *n;
	189
72cdb77d	190	while ((nread = getline(&buf, &buflen, fp)) != -1) {
da8034a0	191	char idbuf[4096];
aba5acdf SH	192	int off;
aba5acdf SH	193	char *p;
d4717914	194	int count1, count2, skip = 0;
aba5acdf SH	195
aba5acdf SH	196	p = strchr(buf, ':');
2c7056ac AC	197	if (!p) {
	198	fprintf(stderr, "%s:%d: error parsing history file\n",
	199	__FILE__, __LINE__);
	200	exit(-2);
	201	}
d4717914	202	count1 = count_spaces(buf);
aba5acdf	203	*p = 0;
b482ffa6	204	idbuf[0] = 0;
	205	strncat(idbuf, buf, sizeof(idbuf) - 1);
	206	off = p - buf;
aba5acdf SH	207	p += 2;
	208
	209	while (*p) {
	210	char *next;
acd1e437	211
aba5acdf SH	212	if ((next = strchr(p, ' ')) != NULL)
	213	*next++ = 0;
	214	else if ((next = strchr(p, '\n')) != NULL)
	215	*next++ = 0;
b482ffa6	216	if (off < sizeof(idbuf)) {
	217	idbuf[off] = 0;
	218	strncat(idbuf, p, sizeof(idbuf) - off - 1);
	219	}
aba5acdf	220	n = malloc(sizeof(*n));
2c7056ac AC	221	if (!n) {
	222	perror("nstat: malloc");
	223	exit(-1);
	224	}
aba5acdf SH	225	n->id = strdup(idbuf);
	226	n->rate = 0;
	227	n->next = db;
	228	db = n;
	229	p = next;
	230	}
	231	n = db;
72cdb77d	232	nread = getline(&buf, &buflen, fp);
2c7056ac AC	233	if (nread == -1) {
	234	fprintf(stderr, "%s:%d: error parsing history file\n",
	235	__FILE__, __LINE__);
	236	exit(-2);
	237	}
d4717914 ED	238	count2 = count_spaces(buf);
	239	if (count2 > count1)
	240	skip = count2 - count1;
aba5acdf SH	241	do {
aba5acdf SH	242	p = strrchr(buf, ' ');
2c7056ac AC	243	if (!p) {
	244	fprintf(stderr, "%s:%d: error parsing history file\n",
	245	__FILE__, __LINE__);
	246	exit(-2);
	247	}
aba5acdf	248	*p = 0;
2c7056ac AC	249	if (sscanf(p+1, "%llu", &n->val) != 1) {
	250	fprintf(stderr, "%s:%d: error parsing history file\n",
	251	__FILE__, __LINE__);
	252	exit(-2);
	253	}
aba5acdf	254	/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
d4717914 ED	255	if (skip)
d4717914 ED	256	skip--;
aba5acdf SH	257	else
	258	n = n->next;
	259	} while (p > buf + off + 2);
	260	}
72cdb77d	261	free(buf);
aba5acdf SH	262
	263	while (db) {
	264	n = db;
	265	db = db->next;
	266	if (useless_number(n->id)) {
	267	free(n->id);
	268	free(n);
	269	} else {
	270	n->next = kern_db;
	271	kern_db = n;
	272	}
	273	}
	274	}
	275
45a0dc16 HL	276	static void load_sctp_snmp(void)
	277	{
	278	FILE *fp = fdopen(net_sctp_snmp_open(), "r");
	279
	280	if (fp) {
	281	load_good_table(fp);
	282	fclose(fp);
	283	}
	284	}
	285
d1f28cf1	286	static void load_snmp(void)
aba5acdf SH	287	{
aba5acdf SH	288	FILE *fp = fdopen(net_snmp_open(), "r");
acd1e437	289
aba5acdf SH	290	if (fp) {
	291	load_ugly_table(fp);
	292	fclose(fp);
	293	}
	294	}
	295
d1f28cf1	296	static void load_snmp6(void)
aba5acdf SH	297	{
aba5acdf SH	298	FILE *fp = fdopen(net_snmp6_open(), "r");
acd1e437	299
aba5acdf SH	300	if (fp) {
	301	load_good_table(fp);
	302	fclose(fp);
	303	}
	304	}
	305
d1f28cf1	306	static void load_netstat(void)
aba5acdf SH	307	{
aba5acdf SH	308	FILE *fp = fdopen(net_netstat_open(), "r");
acd1e437	309
aba5acdf SH	310	if (fp) {
	311	load_ugly_table(fp);
	312	fclose(fp);
	313	}
	314	}
	315
d48ed3f4	316
d1f28cf1	317	static void dump_kern_db(FILE *fp, int to_hist)
aba5acdf	318	{
fcc16c22	319	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
aba5acdf	320	struct nstat_ent n, h;
d48ed3f4	321
aba5acdf	322	h = hist_db;
fcc16c22	323	if (jw) {
d721a145	324	jsonw_start_object(jw);
fcc16c22 SH	325	jsonw_pretty(jw, pretty);
	326	jsonw_name(jw, info_source);
	327	jsonw_start_object(jw);
	328	} else
d48ed3f4	329	fprintf(fp, "#%s\n", info_source);
404582c8	330
acd1e437	331	for (n = kern_db; n; n = n->next) {
aba5acdf	332	unsigned long long val = n->val;
acd1e437	333
aba5acdf SH	334	if (!dump_zeros && !val && !n->rate)
	335	continue;
	336	if (!match(n->id)) {
	337	struct nstat_ent *h1;
acd1e437	338
aba5acdf SH	339	if (!to_hist)
	340	continue;
	341	for (h1 = h; h1; h1 = h1->next) {
	342	if (strcmp(h1->id, n->id) == 0) {
	343	val = h1->val;
	344	h = h1->next;
	345	break;
	346	}
	347	}
	348	}
d48ed3f4	349
fcc16c22 SH	350	if (jw)
	351	jsonw_uint_field(jw, n->id, val);
	352	else
d48ed3f4	353	fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
aba5acdf	354	}
fcc16c22 SH	355
fcc16c22 SH	356	if (jw) {
d721a145 AK	357	jsonw_end_object(jw);
d721a145 AK	358
fcc16c22 SH	359	jsonw_end_object(jw);
	360	jsonw_destroy(&jw);
	361	}
aba5acdf SH	362	}
aba5acdf SH	363
d1f28cf1	364	static void dump_incr_db(FILE *fp)
aba5acdf	365	{
fcc16c22	366	json_writer_t *jw = json_output ? jsonw_new(fp) : NULL;
aba5acdf	367	struct nstat_ent n, h;
d48ed3f4	368
aba5acdf	369	h = hist_db;
fcc16c22	370	if (jw) {
d721a145	371	jsonw_start_object(jw);
fcc16c22 SH	372	jsonw_pretty(jw, pretty);
	373	jsonw_name(jw, info_source);
	374	jsonw_start_object(jw);
	375	} else
d48ed3f4 SH	376	fprintf(fp, "#%s\n", info_source);
d48ed3f4 SH	377
acd1e437	378	for (n = kern_db; n; n = n->next) {
aba5acdf SH	379	int ovfl = 0;
	380	unsigned long long val = n->val;
	381	struct nstat_ent *h1;
acd1e437	382
aba5acdf SH	383	for (h1 = h; h1; h1 = h1->next) {
	384	if (strcmp(h1->id, n->id) == 0) {
	385	if (val < h1->val) {
	386	ovfl = 1;
	387	val = h1->val;
	388	}
	389	val -= h1->val;
	390	h = h1->next;
	391	break;
	392	}
	393	}
	394	if (!dump_zeros && !val && !n->rate)
	395	continue;
	396	if (!match(n->id))
	397	continue;
d48ed3f4	398
fcc16c22 SH	399	if (jw)
	400	jsonw_uint_field(jw, n->id, val);
	401	else
d48ed3f4 SH	402	fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
d48ed3f4 SH	403	n->rate, ovfl?" (overflow)":"");
aba5acdf	404	}
fcc16c22 SH	405
fcc16c22 SH	406	if (jw) {
d721a145 AK	407	jsonw_end_object(jw);
d721a145 AK	408
fcc16c22 SH	409	jsonw_end_object(jw);
	410	jsonw_destroy(&jw);
	411	}
aba5acdf SH	412	}
	413
	414	static int children;
	415
d1f28cf1	416	static void sigchild(int signo)
aba5acdf SH	417	{
	418	}
	419
d1f28cf1	420	static void update_db(int interval)
aba5acdf SH	421	{
	422	struct nstat_ent n, h;
	423
	424	n = kern_db;
	425	kern_db = NULL;
	426
	427	load_netstat();
	428	load_snmp6();
	429	load_snmp();
45a0dc16	430	load_sctp_snmp();
aba5acdf SH	431
	432	h = kern_db;
	433	kern_db = n;
	434
	435	for (n = kern_db; n; n = n->next) {
	436	struct nstat_ent *h1;
acd1e437	437
aba5acdf SH	438	for (h1 = h; h1; h1 = h1->next) {
	439	if (strcmp(h1->id, n->id) == 0) {
	440	double sample;
cdb2227e ED	441	unsigned long long incr = h1->val - n->val;
	442
	443	n->val = h1->val;
	444	sample = (double)incr * 1000.0 / interval;
aba5acdf SH	445	if (interval >= scan_interval) {
	446	n->rate += W*(sample-n->rate);
	447	} else if (interval >= 1000) {
	448	if (interval >= time_constant) {
	449	n->rate = sample;
	450	} else {
	451	double w = W*(double)interval/scan_interval;
acd1e437	452
aba5acdf SH	453	n->rate += w*(sample-n->rate);
	454	}
	455	}
	456
	457	while (h != h1) {
	458	struct nstat_ent *tmp = h;
acd1e437	459
aba5acdf SH	460	h = h->next;
	461	free(tmp->id);
	462	free(tmp);
	463	};
	464	h = h1->next;
	465	free(h1->id);
	466	free(h1);
	467	break;
	468	}
	469	}
	470	}
	471	}
	472
acd1e437	473	#define T_DIFF(a, b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
aba5acdf SH	474
aba5acdf SH	475
d1f28cf1	476	static void server_loop(int fd)
aba5acdf	477	{
737f15f6	478	struct timeval snaptime = { 0 };
aba5acdf	479	struct pollfd p;
acd1e437	480
aba5acdf SH	481	p.fd = fd;
aba5acdf SH	482	p.events = p.revents = POLLIN;
ae665a52	483
aba5acdf SH	484	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
	485	getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
	486
	487	load_netstat();
	488	load_snmp6();
	489	load_snmp();
45a0dc16	490	load_sctp_snmp();
aba5acdf SH	491
	492	for (;;) {
	493	int status;
dd81ee04	494	time_t tdiff;
aba5acdf	495	struct timeval now;
acd1e437	496
aba5acdf SH	497	gettimeofday(&now, NULL);
	498	tdiff = T_DIFF(now, snaptime);
	499	if (tdiff >= scan_interval) {
	500	update_db(tdiff);
	501	snaptime = now;
	502	tdiff = 0;
	503	}
dd81ee04	504	if (poll(&p, 1, scan_interval - tdiff) > 0
aba5acdf SH	505	&& (p.revents&POLLIN)) {
aba5acdf SH	506	int clnt = accept(fd, NULL, NULL);
acd1e437	507
aba5acdf SH	508	if (clnt >= 0) {
aba5acdf SH	509	pid_t pid;
acd1e437	510
aba5acdf SH	511	if (children >= 5) {
	512	close(clnt);
	513	} else if ((pid = fork()) != 0) {
acd1e437	514	if (pid > 0)
aba5acdf SH	515	children++;
	516	close(clnt);
	517	} else {
	518	FILE *fp = fdopen(clnt, "w");
acd1e437	519
dd81ee04	520	if (fp)
aba5acdf	521	dump_kern_db(fp, 0);
aba5acdf SH	522	exit(0);
	523	}
	524	}
	525	}
	526	while (children && waitpid(-1, &status, WNOHANG) > 0)
	527	children--;
	528	}
	529	}
	530
d1f28cf1	531	static int verify_forging(int fd)
aba5acdf SH	532	{
aba5acdf SH	533	struct ucred cred;
737f15f6 SH	534	socklen_t olen = sizeof(cred);
737f15f6 SH	535
acd1e437	536	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void *)&cred, &olen) \|\|
aba5acdf SH	537	olen < sizeof(cred))
	538	return -1;
	539	if (cred.uid == getuid() \|\| cred.uid == 0)
	540	return 0;
	541	return -1;
	542	}
	543
	544	static void usage(void) __attribute__((noreturn));
	545
	546	static void usage(void)
	547	{
	548	fprintf(stderr,
8589eb4e MC	549	"Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
	550	" -h, --help this message\n"
	551	" -a, --ignore ignore history\n"
	552	" -d, --scan=SECS sample every statistics every SECS\n"
	553	" -j, --json format output in JSON\n"
	554	" -n, --nooutput do history only\n"
	555	" -p, --pretty pretty print\n"
	556	" -r, --reset reset history\n"
	557	" -s, --noupdate don't update history\n"
	558	" -t, --interval=SECS report average over the last SECS\n"
	559	" -V, --version output version information\n"
	560	" -z, --zeros show entries with zero activity\n");
aba5acdf SH	561	exit(-1);
	562	}
	563
404582c8 SH	564	static const struct option longopts[] = {
	565	{ "help", 0, 0, 'h' },
	566	{ "ignore", 0, 0, 'a' },
	567	{ "scan", 1, 0, 'd'},
	568	{ "nooutput", 0, 0, 'n' },
	569	{ "json", 0, 0, 'j' },
	570	{ "reset", 0, 0, 'r' },
	571	{ "noupdate", 0, 0, 's' },
fcc16c22	572	{ "pretty", 0, 0, 'p' },
404582c8 SH	573	{ "interval", 1, 0, 't' },
	574	{ "version", 0, 0, 'V' },
	575	{ "zeros", 0, 0, 'z' },
	576	{ 0 }
	577	};
aba5acdf SH	578
	579	int main(int argc, char *argv[])
	580	{
896ebd6c	581	char *hist_name;
aba5acdf SH	582	struct sockaddr_un sun;
	583	FILE *hist_fp = NULL;
	584	int ch;
	585	int fd;
	586
fcc16c22	587	while ((ch = getopt_long(argc, argv, "h?vVzrnasd:t:jp",
404582c8	588	longopts, NULL)) != EOF) {
acd1e437	589	switch (ch) {
aba5acdf SH	590	case 'z':
	591	dump_zeros = 1;
	592	break;
	593	case 'r':
	594	reset_history = 1;
	595	break;
	596	case 'a':
	597	ignore_history = 1;
	598	break;
	599	case 's':
	600	no_update = 1;
	601	break;
	602	case 'n':
	603	no_output = 1;
	604	break;
	605	case 'd':
	606	scan_interval = 1000*atoi(optarg);
	607	break;
	608	case 't':
	609	if (sscanf(optarg, "%d", &time_constant) != 1 \|\|
	610	time_constant <= 0) {
	611	fprintf(stderr, "nstat: invalid time constant divisor\n");
	612	exit(-1);
	613	}
	614	break;
d48ed3f4 SH	615	case 'j':
	616	json_output = 1;
	617	break;
fcc16c22 SH	618	case 'p':
	619	pretty = 1;
	620	break;
aba5acdf SH	621	case 'v':
aba5acdf SH	622	case 'V':
fbef6555	623	printf("nstat utility, iproute2-%s\n", version);
aba5acdf SH	624	exit(0);
	625	case 'h':
	626	case '?':
	627	default:
	628	usage();
	629	}
	630	}
	631
	632	argc -= optind;
	633	argv += optind;
	634
	635	sun.sun_family = AF_UNIX;
	636	sun.sun_path[0] = 0;
	637	sprintf(sun.sun_path+1, "nstat%d", getuid());
	638
	639	if (scan_interval > 0) {
	640	if (time_constant == 0)
	641	time_constant = 60;
	642	time_constant *= 1000;
	643	W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
	644	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
	645	perror("nstat: socket");
	646	exit(-1);
	647	}
acd1e437	648	if (bind(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
aba5acdf SH	649	perror("nstat: bind");
	650	exit(-1);
	651	}
	652	if (listen(fd, 5) < 0) {
	653	perror("nstat: listen");
	654	exit(-1);
	655	}
a7a9ddbb MF	656	if (daemon(0, 0)) {
	657	perror("nstat: daemon");
	658	exit(-1);
	659	}
aba5acdf SH	660	signal(SIGPIPE, SIG_IGN);
	661	signal(SIGCHLD, sigchild);
	662	server_loop(fd);
	663	exit(0);
	664	}
	665
	666	patterns = argv;
	667	npatterns = argc;
	668
896ebd6c SH	669	if ((hist_name = getenv("NSTAT_HISTORY")) == NULL) {
896ebd6c SH	670	hist_name = malloc(128);
aba5acdf	671	sprintf(hist_name, "/tmp/.nstat.u%d", getuid());
896ebd6c	672	}
aba5acdf SH	673
	674	if (reset_history)
	675	unlink(hist_name);
	676
	677	if (!ignore_history \|\| !no_update) {
	678	struct stat stb;
	679
	680	fd = open(hist_name, O_RDWR\|O_CREAT\|O_NOFOLLOW, 0600);
	681	if (fd < 0) {
	682	perror("nstat: open history file");
	683	exit(-1);
	684	}
	685	if ((hist_fp = fdopen(fd, "r+")) == NULL) {
	686	perror("nstat: fdopen history file");
	687	exit(-1);
	688	}
	689	if (flock(fileno(hist_fp), LOCK_EX)) {
	690	perror("nstat: flock history file");
	691	exit(-1);
	692	}
	693	if (fstat(fileno(hist_fp), &stb) != 0) {
	694	perror("nstat: fstat history file");
	695	exit(-1);
	696	}
	697	if (stb.st_nlink != 1 \|\| stb.st_uid != getuid()) {
	698	fprintf(stderr, "nstat: something is so wrong with history file, that I prefer not to proceed.\n");
	699	exit(-1);
	700	}
	701	if (!ignore_history) {
	702	FILE *tfp;
9a230771	703	long uptime = -1;
acd1e437	704
aba5acdf SH	705	if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
	706	if (fscanf(tfp, "%ld", &uptime) != 1)
	707	uptime = -1;
	708	fclose(tfp);
	709	}
	710	if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
	711	fprintf(stderr, "nstat: history is aged out, resetting\n");
d572ed4d PS	712	if (ftruncate(fileno(hist_fp), 0) < 0)
d572ed4d PS	713	perror("nstat: ftruncate");
aba5acdf SH	714	}
	715	}
	716
	717	load_good_table(hist_fp);
	718
	719	hist_db = kern_db;
	720	kern_db = NULL;
	721	}
	722
	723	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
acd1e437	724	(connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0
aba5acdf	725	\|\| (strcpy(sun.sun_path+1, "nstat0"),
acd1e437	726	connect(fd, (struct sockaddr *)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
aba5acdf SH	727	&& verify_forging(fd) == 0) {
aba5acdf SH	728	FILE *sfp = fdopen(fd, "r");
acd1e437	729
6d02518f PS	730	if (!sfp) {
	731	fprintf(stderr, "nstat: fdopen failed: %s\n",
	732	strerror(errno));
	733	close(fd);
	734	} else {
	735	load_good_table(sfp);
	736	if (hist_db && source_mismatch) {
	737	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	738	hist_db = NULL;
	739	}
	740	fclose(sfp);
aba5acdf	741	}
aba5acdf SH	742	} else {
	743	if (fd >= 0)
	744	close(fd);
	745	if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
	746	fprintf(stderr, "nstat: history is stale, ignoring it.\n");
	747	hist_db = NULL;
	748	info_source[0] = 0;
	749	}
	750	load_netstat();
	751	load_snmp6();
	752	load_snmp();
45a0dc16	753	load_sctp_snmp();
aba5acdf SH	754	if (info_source[0] == 0)
	755	strcpy(info_source, "kernel");
	756	}
	757
	758	if (!no_output) {
	759	if (ignore_history \|\| hist_db == NULL)
	760	dump_kern_db(stdout, 0);
	761	else
	762	dump_incr_db(stdout);
	763	}
	764	if (!no_update) {
d572ed4d PS	765	if (ftruncate(fileno(hist_fp), 0) < 0)
d572ed4d PS	766	perror("nstat: ftruncate");
aba5acdf	767	rewind(hist_fp);
404582c8 SH	768
404582c8 SH	769	json_output = 0;
aba5acdf	770	dump_kern_db(hist_fp, 1);
404582c8	771	fclose(hist_fp);
aba5acdf SH	772	}
	773	exit(0);
	774	}