X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=misc%2Fnstat.c;h=9580ccf348036bd4e846d4ac4a0a8cad5ad649b5;hb=aba5acdfdb347d2c21fc67d613d83d4430ca3937;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hpb=86fdf0e47be697587efcf9602cd1f952a1d73170;p=mirror_iproute2.git

diff --git a/misc/nstat.c b/misc/nstat.c
index e69de29b..9580ccf3 100644
--- a/misc/nstat.c
+++ b/misc/nstat.c
@@ -0,0 +1,614 @@
+/*
+ * 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 <SNAPSHOT.h>
+
+int dump_zeros = 0;
+int reset_history = 0;
+int ignore_history = 0;
+int no_output = 0;
+int no_update = 0;
+int scan_interval = 0;
+int time_constant = 0;
+double W;
+char **patterns;
+int npatterns;
+
+char info_source[128];
+int source_mismatch;
+
+int generic_proc_open(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(store, O_RDONLY);
+}
+
+int net_netstat_open(void)
+{
+	return generic_proc_open("PROC_NET_NETSTAT", "net/netstat");
+}
+
+int net_snmp_open(void)
+{
+	return generic_proc_open("PROC_NET_SNMP", "net/snmp");
+}
+
+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;
+	unsigned long	   ival;
+	double		   rate;
+};
+
+struct nstat_ent *kern_db;
+struct nstat_ent *hist_db;
+
+char *useless_numbers[] = {
+"IpForwarding", "IpDefaultTTL",
+"TcpRtoAlgorithm", "TcpRtoMin", "TcpRtoMax",
+"TcpMaxConn", "TcpCurrEstab"
+};
+
+int useless_number(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;
+}
+
+int match(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;
+}
+
+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[256];
+		if (buf[0] == '#') {
+			buf[strlen(buf)-1] = 0;
+			if (info_source[0] && strcmp(info_source, buf+1))
+				source_mismatch = 1;
+			strncpy(info_source, buf+1, sizeof(info_source)-1);
+			continue;
+		}
+		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->ival = (unsigned long)val;
+		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;
+	}
+}
+
+
+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[256];
+		int  off;
+		char *p;
+
+		p = strchr(buf, ':');
+		if (!p)
+			abort();
+		*p = 0;
+		strcpy(idbuf, buf);
+		off = strlen(idbuf);
+		p += 2;
+
+		while (*p) {
+			char *next;
+			if ((next = strchr(p, ' ')) != NULL)
+				*next++ = 0;
+			else if ((next = strchr(p, '\n')) != NULL)
+				*next++ = 0;
+			strcpy(idbuf+off, p);
+			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();
+		do {
+			p = strrchr(buf, ' ');
+			if (!p)
+				abort();
+			*p = 0;
+			if (sscanf(p+1, "%lu", &n->ival) != 1)
+				abort();
+			n->val = n->ival;
+			/* Trick to skip "dummy" trailing ICMP MIB in 2.4 */
+			if (strcmp(idbuf, "IcmpOutAddrMaskReps") == 0)
+				idbuf[5] = 0;
+			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;
+		}
+	}
+}
+
+void load_snmp(void)
+{
+	FILE *fp = fdopen(net_snmp_open(), "r");
+	if (fp) {
+		load_ugly_table(fp);
+		fclose(fp);
+	}
+}
+
+void load_snmp6(void)
+{
+	FILE *fp = fdopen(net_snmp6_open(), "r");
+	if (fp) {
+		load_good_table(fp);
+		fclose(fp);
+	}
+}
+
+void load_netstat(void)
+{
+	FILE *fp = fdopen(net_netstat_open(), "r");
+	if (fp) {
+		load_ugly_table(fp);
+		fclose(fp);
+	}
+}
+
+void dump_kern_db(FILE *fp, int to_hist)
+{
+	struct nstat_ent *n, *h;
+	h = hist_db;
+	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;
+				}
+			}
+		}
+		fprintf(fp, "%-32s%-16llu%6.1f\n", n->id, val, n->rate);
+	}
+}
+
+void dump_incr_db(FILE *fp)
+{
+	struct nstat_ent *n, *h;
+	h = hist_db;
+	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;
+		fprintf(fp, "%-32s%-16llu%6.1f%s\n", n->id, val,
+			n->rate, ovfl?" (overflow)":"");
+	}
+}
+
+static int children;
+
+void sigchild(int signo)
+{
+}
+
+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 incr = h1->ival - n->ival;
+				n->val += incr;
+				n->ival = h1->ival;
+				sample = (double)(incr*1000)/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)
+
+
+void server_loop(int fd)
+{
+	struct timeval snaptime;
+	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--;
+	}
+}
+
+int verify_forging(int fd)
+{
+	struct ucred cred;
+	int 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 [ -h?vVzrnasd:t: ] [ PATTERN [ PATTERN ] ]\n"
+		);
+	exit(-1);
+}
+
+
+int main(int argc, char *argv[])
+{
+	char hist_name[128];
+	struct sockaddr_un sun;
+	FILE *hist_fp = NULL;
+	int ch;
+	int fd;
+
+	while ((ch = getopt(argc, argv, "h?vVzrnasd:t:")) != 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 '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 (fork())
+			exit(0);
+		chdir("/");
+		close(0); close(1); close(2); setsid();
+		signal(SIGPIPE, SIG_IGN);
+		signal(SIGCHLD, sigchild);
+		server_loop(fd);
+		exit(0);
+	}
+
+	patterns = argv;
+	npatterns = argc;
+
+	if (getenv("NSTAT_HISTORY"))
+		snprintf(hist_name, sizeof(hist_name), getenv("NSTAT_HISTORY"));
+	else
+		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;
+			if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
+				if (fscanf(tfp, "%ld", &uptime) != 1)
+					uptime = -1;
+				fclose(tfp);
+			}
+			if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
+				fprintf(stderr, "nstat: history is aged out, resetting\n");
+				ftruncate(fileno(hist_fp), 0);
+			}
+		}
+
+		load_good_table(hist_fp);
+
+		hist_db = kern_db;
+		kern_db = NULL;
+	}
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
+	    (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
+	     || (strcpy(sun.sun_path+1, "nstat0"),
+		 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
+	    && verify_forging(fd) == 0) {
+		FILE *sfp = fdopen(fd, "r");
+		load_good_table(sfp);
+		if (hist_db && source_mismatch) {
+			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
+			hist_db = NULL;
+		}
+		fclose(sfp);
+	} else {
+		if (fd >= 0)
+			close(fd);
+		if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
+			fprintf(stderr, "nstat: history is stale, ignoring it.\n");
+			hist_db = NULL;
+			info_source[0] = 0;
+		}
+		load_netstat();
+		load_snmp6();
+		load_snmp();
+		if (info_source[0] == 0)
+			strcpy(info_source, "kernel");
+	}
+
+	if (!no_output) {
+		if (ignore_history || hist_db == NULL)
+			dump_kern_db(stdout, 0);
+		else
+			dump_incr_db(stdout);
+	}
+	if (!no_update) {
+		ftruncate(fileno(hist_fp), 0);
+		rewind(hist_fp);
+		dump_kern_db(hist_fp, 1);
+		fflush(hist_fp);
+	}
+	exit(0);
+}