[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>

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

char info_source[128];
int source_mismatch;

static int generic_proc_open(const char *env, char *name)
{
	char store[128];
	char *p = getenv(env);
	if (!p) {
		p = getenv("PROC_ROOT") ? : "/proc";
		snprintf(store, sizeof(store)-1, "%s/%s", p, name);
		p = store;
	}
	return open(p, O_RDONLY);
}

static int net_netstat_open(void)
{
	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
}

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

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

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

struct nstat_ent *kern_db;
struct nstat_ent *hist_db;

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

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

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

	if (npatterns == 0)
		return 1;

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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

	h = hist_db;
	if (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_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_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_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();

	h = kern_db;
	kern_db = n;

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

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

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

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


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

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

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

	for (;;) {
		int status;
		int tdiff;
		struct timeval now;
		gettimeofday(&now, NULL);
		tdiff = T_DIFF(now, snaptime);
		if (tdiff >= scan_interval) {
			update_db(tdiff);
			snaptime = now;
			tdiff = 0;
		}
		if (poll(&p, 1, tdiff + scan_interval) > 0
		    && (p.revents&POLLIN)) {
			int clnt = accept(fd, NULL, NULL);
			if (clnt >= 0) {
				pid_t pid;
				if (children >= 5) {
					close(clnt);
				} else if ((pid = fork()) != 0) {
					if (pid>0)
						children++;
					close(clnt);
				} else {
					FILE *fp = fdopen(clnt, "w");
					if (fp) {
						if (tdiff > 0)
							update_db(tdiff);
						dump_kern_db(fp, 0);
					}
					exit(0);
				}
			}
		}
		while (children && waitpid(-1, &status, WNOHANG) > 0)
			children--;
	}
}

static int verify_forging(int fd)
{
	struct ucred cred;
	socklen_t olen = sizeof(cred);

	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) ||
	    olen < sizeof(cred))
		return -1;
	if (cred.uid == getuid() || cred.uid == 0)
		return 0;
	return -1;
}

static void usage(void) __attribute__((noreturn));

static void usage(void)
{
	fprintf(stderr,
"Usage: nstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
"   -h, --help		this message\n"
"   -a, --ignore	ignore history\n"
"   -d, --scan=SECS	sample every statistics every SECS\n"
"   -j, --json          format output in JSON\n"
"   -n, --nooutput	do history only\n"
"   -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");
		load_good_table(sfp);
		if (hist_db && source_mismatch) {
			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
			hist_db = NULL;
		}
		fclose(sfp);
	} else {
		if (fd >= 0)
			close(fd);
		if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
			hist_db = NULL;
			info_source[0] = 0;
		}
		load_netstat();
		load_snmp6();
		load_snmp();
		if (info_source[0] == 0)
			strcpy(info_source, "kernel");
	}

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