+/*
+ * 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);
+}
projects / mirror_iproute2.git / blobdiff