-lnstat - linux networking statistics
-(C) 2004 Harald Welte <laforge@gnumonks.org
-======================================================================
-
-This tool is a generalized and more feature-complete replacement for the old
-'rtstat' program.
-
-In addition to routing cache statistics, it supports any kind of statistics
-the linux kernel exports via a file in /proc/net/stat. In a stock 2.6.9
-kernel, this is
- per-protocol neighbour cache statistics
- (ipv4, ipv6, atm, decnet)
- routing cache statistics
- (ipv4)
- connection tracking statistics
- (ipv4)
-
-Please note that lnstat will adopt to any additional statistics that might be
-added to the kernel at some later point
-
-I personally always like examples more than any reference documentation, so I
-list the following examples. If somebody wants to do a manpage, feel free
-to send me a patch :)
-
-EXAMPLES:
-
-In order to get a list of supported statistics files, you can run
-
- lnstat -d
-
-It will display something like
-
-/proc/net/stat/arp_cache:
- 1: entries
- 2: allocs
- 3: destroys
-[...]
-/proc/net/stat/rt_cache:
- 1: entries
- 2: in_hit
- 3: in_slow_tot
-
-You can now select the files/keys you are interested by something like
-
- lnstat -k arp_cache:entries,rt_cache:in_hit,arp_cache:destroys
-
-arp_cach|rt_cache|arp_cach|
- entries| in_hit|destroys|
- 6| 6| 0|
- 6| 0| 0|
- 6| 2| 0|
-
-
-You can specify the interval (e.g. 10 seconds) by:
-
- lnstat -i 10
-
-You can specify to only use one particular statistics file:
-
- lnstat -f ip_conntrack
-
-You can specify individual field widths
-
- lnstat -k arp_cache:entries,rt_cache:entries -w 20,8
-
-You can specify not to print a header at all
-
- lnstat -s 0
-
-You can specify to print a header only at start of the program
-
- lnstat -s 1
-
-You can specify to print a header at start and every 20 lines:
-
- lnstat -s 20
-
-You can specify the number of samples you want to take (e.g. 5):
-
- lnstat -c 5
-
-/* lnstat - Unified linux network statistics
- *
- * Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
- *
- * Development of this code was funded by Astaro AG, http://www.astaro.com/
- *
- * Based on original concept and ideas from predecessor rtstat.c:
- *
- * Copyright 2001 by Robert Olsson <robert.olsson@its.uu.se>
- * Uppsala University, Sweden
- *
- * 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.
- *
- */
-
-/* Maximum number of fields that can be displayed */
-#define MAX_FIELDS 64
-
-/* Maximum number of header lines */
-#define HDR_LINES 10
-
-/* default field width if none specified */
-#define FIELD_WIDTH_DEFAULT 8
-#define FIELD_WIDTH_MAX 20
-
-#define DEFAULT_INTERVAL 2
-
-#define HDR_LINE_LENGTH (MAX_FIELDS*FIELD_WIDTH_MAX)
-
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <getopt.h>
-
-#include "lnstat.h"
-
-static struct option opts[] = {
- { "version", 0, NULL, 'V' },
- { "count", 1, NULL, 'c' },
- { "dump", 1, NULL, 'd' },
- { "file", 1, NULL, 'f' },
- { "help", 0, NULL, 'h' },
- { "interval", 1, NULL, 'i' },
- { "key", 1, NULL, 'k' },
- { "subject", 1, NULL, 's' },
- { "width", 1, NULL, 'w' },
-};
-
-static int usage(char *name, int exit_code)
-{
- fprintf(stderr, "%s Version %s\n", name, LNSTAT_VERSION);
- fprintf(stderr, "Copyright (C) 2004 by Harald Welte "
- "<laforge@gnumonks.org>\n");
- fprintf(stderr, "This program is free software licensed under GNU GPLv2"
- "\nwith ABSOLUTELY NO WARRANTY.\n\n");
- fprintf(stderr, "Parameters:\n");
- fprintf(stderr, "\t-V --version\t\tPrint Version of Program\n");
- fprintf(stderr, "\t-c --count <count>\t"
- "Print <count> number of intervals\n");
- fprintf(stderr, "\t-d --dumpt\t\t"
- "Dump list of available files/keys\n");
- fprintf(stderr, "\t-f --file <file>\tStatistics file to use\n");
- fprintf(stderr, "\t-h --help\t\tThis help message\n");
- fprintf(stderr, "\t-i --interval <intv>\t"
- "Set interval to 'intv' seconds\n");
- fprintf(stderr, "\t-k --keys k,k,k,...\tDisplay only keys specified\n");
- fprintf(stderr, "\t-s --subject [0-2]\t?\n");
- fprintf(stderr, "\t-w --width n,n,n,...\tWidth for each field\n");
- fprintf(stderr, "\n");
-
- exit(exit_code);
-}
-
-struct field_param {
- char *name;
- struct lnstat_field *lf;
- struct {
- unsigned int width;
- } print;
-};
-
-struct field_params {
- unsigned int num;
- struct field_param params[MAX_FIELDS];
-};
-
-static void print_line(FILE *of, struct lnstat_file *lnstat_files,
- struct field_params *fp)
-{
- int i;
-
- for (i = 0; i < fp->num; i++) {
- struct lnstat_field *lf = fp->params[i].lf;
- char formatbuf[255];
-
- snprintf(formatbuf, sizeof(formatbuf)-1, "%%%ulu|",
- fp->params[i].print.width);
- fprintf(of, formatbuf, lf->result);
- }
- fputc('\n', of);
-}
-
-/* find lnstat_field according to user specification */
-static int map_field_params(struct lnstat_file *lnstat_files,
- struct field_params *fps, int interval)
-{
- int i, j = 0;
- struct lnstat_file *lf;
-
- /* no field specification on commandline, need to build default */
- if (!fps->num) {
- for (lf = lnstat_files; lf; lf = lf->next) {
- for (i = 0; i < lf->num_fields; i++) {
- fps->params[j].lf = &lf->fields[i];
- fps->params[j].lf->file->interval.tv_sec =
- interval;
- if (!fps->params[j].print.width)
- fps->params[j].print.width =
- FIELD_WIDTH_DEFAULT;
- j++;
- }
- }
- fps->num = j;
- return 1;
- }
-
- for (i = 0; i < fps->num; i++) {
- fps->params[i].lf = lnstat_find_field(lnstat_files,
- fps->params[i].name);
- if (!fps->params[i].lf) {
- fprintf(stderr, "Field `%s' unknown\n",
- fps->params[i].name);
- return 0;
- }
- fps->params[i].lf->file->interval.tv_sec = interval;
- if (!fps->params[i].print.width)
- fps->params[i].print.width = FIELD_WIDTH_DEFAULT;
- }
- return 1;
-}
-
-struct table_hdr {
- int num_lines;
- char *hdr[HDR_LINES];
-};
-
-static struct table_hdr *build_hdr_string(struct lnstat_file *lnstat_files,
- struct field_params *fps,
- int linewidth)
-{
- int h,i;
- static struct table_hdr th;
- int ofs = 0;
-
- for (i = 0; i < HDR_LINES; i++) {
- th.hdr[i] = malloc(HDR_LINE_LENGTH);
- memset(th.hdr[i], 0, sizeof(th.hdr[i]));
- }
-
- for (i = 0; i < fps->num; i++) {
- char *cname, *fname = fps->params[i].lf->name;
- char fmt[12];
- unsigned int width = fps->params[i].print.width;
-
- snprintf(fmt, sizeof(fmt)-1, "%%%u.%us|", width, width);
-
- snprintf(th.hdr[0]+ofs, width+2, fmt,
- fps->params[i].lf->file->basename);
-
- cname = fname;
- for (h = 1; h < HDR_LINES; h++) {
- if (cname - fname >= strlen(fname))
- snprintf(th.hdr[h]+ofs, width+2, fmt, "");
- else {
- th.num_lines = h+1;
- snprintf(th.hdr[h]+ofs, width+2, fmt, cname);
- }
- cname += width;
- }
- ofs += width+1;
- }
- /* fill in spaces */
- for (h = 1; h <= th.num_lines; h++) {
- for (i = 0; i < ofs; i++) {
- if (th.hdr[h][i] == '\0')
- th.hdr[h][i] = ' ';
- }
- }
-
- return &th;
-}
-
-static int print_hdr(FILE *of, struct table_hdr *th)
-{
- int i;
-
- for (i = 0; i < th->num_lines; i++) {
- fputs(th->hdr[i], of);
- fputc('\n', of);
- }
- return 0;
-}
-
-
-int main(int argc, char **argv)
-{
- struct lnstat_file *lnstat_files;
- char *basename;
- int c;
-
- int interval = DEFAULT_INTERVAL;
- int hdr = 2;
-
- enum {
- MODE_DUMP,
- MODE_NORMAL,
- } mode;
- unsigned long count = 0;
- struct field_params fp;
- int num_req_files = 0;
- char *req_files[LNSTAT_MAX_FILES];
-
- memset(&fp, 0, sizeof(fp));
-
- mode = MODE_NORMAL;
-
- /* backwards compatibility mode for old tools */
- basename = strrchr(argv[0], '/') + 1;
- if (!strcmp(basename, "rtstat")) {
- /* rtstat compatibility mode */
- req_files[0] = "rt_cache";
- num_req_files = 1;
- } else if (!strcmp(basename, "ctstat")) {
- /* ctstat compatibility mode */
- req_files[0] = "ip_conntrack";
- num_req_files = 1;
- }
-
- while ((c = getopt_long(argc, argv,"Vc:df:h?i:k:s:w:",
- opts, NULL)) != -1) {
- switch (c) {
- int i, len;
- char *tmp, *tok;
- case 'c':
- count = strtoul(optarg, NULL, 0);
- break;
- case 'd':
- mode = MODE_DUMP;
- break;
- case 'f':
- req_files[num_req_files++] = strdup(optarg);
- break;
- case '?':
- case 'h':
- usage(argv[0], 0);
- break;
- case 'i':
- sscanf(optarg, "%u", &interval);
- break;
- case 'k':
- tmp = strdup(optarg);
- if (!tmp)
- break;
- for (tok = strtok(tmp, ",");
- tok;
- tok = strtok(NULL, ",")) {
- if (fp.num >= MAX_FIELDS)
- break;
- fp.params[fp.num++].name = tok;
- }
- break;
- case 's':
- sscanf(optarg, "%u", &hdr);
- break;
- case 'w':
- tmp = strdup(optarg);
- if (!tmp)
- break;
- i = 0;
- for (tok = strtok(tmp, ",");
- tok;
- tok = strtok(NULL, ",")) {
- len = strtoul(tok, NULL, 0);
- if (len > FIELD_WIDTH_MAX)
- len = FIELD_WIDTH_MAX;
- fp.params[i].print.width = len;
- i++;
- }
- if (i == 1) {
- for (i = 0; i < MAX_FIELDS; i++)
- fp.params[i].print.width = len;
- }
- break;
- default:
- usage(argv[0], 1);
- break;
- }
- }
-
- lnstat_files = lnstat_scan_dir(PROC_NET_STAT, num_req_files,
- (const char **) req_files);
-
- switch (mode) {
- int i;
- struct table_hdr *header;
- case MODE_DUMP:
- lnstat_dump(stderr, lnstat_files);
- break;
- case MODE_NORMAL:
-
- if (!map_field_params(lnstat_files, &fp, interval))
- exit(1);
-
- header = build_hdr_string(lnstat_files, &fp, 80);
- if (!header)
- exit(1);
-
- if (interval < 1 )
- interval=1;
-
- for (i = 0; i < count; i++) {
- if ((hdr > 1 && (! (i % 20))) || (hdr == 1 && i == 0))
- print_hdr(stdout, header);
- lnstat_update(lnstat_files);
- print_line(stdout, lnstat_files, &fp);
- sleep(interval);
- }
- }
-
- return 1;
-}
-
-#ifndef _LNSTAT_H
-#define _LNSTAT_H
-
-#include <limits.h>
-
-#define LNSTAT_VERSION "0.02 041002"
-
-#define PROC_NET_STAT "/proc/net/stat"
-
-#define LNSTAT_MAX_FILES 32
-#define LNSTAT_MAX_FIELDS_PER_LINE 32
-#define LNSTAT_MAX_FIELD_NAME_LEN 32
-
-struct lnstat_file;
-
-struct lnstat_field {
- struct lnstat_file *file;
- unsigned int num; /* field number in line */
- char name[LNSTAT_MAX_FIELD_NAME_LEN+1];
- unsigned long values[2]; /* two buffers for values */
- unsigned long result;
-};
-
-struct lnstat_file {
- struct lnstat_file *next;
- char path[PATH_MAX+1];
- char basename[NAME_MAX+1];
- struct timeval last_read; /* last time of read */
- struct timeval interval; /* interval */
- int compat; /* 1 == backwards compat mode */
- FILE *fp;
- unsigned int num_fields; /* number of fields */
- struct lnstat_field fields[LNSTAT_MAX_FIELDS_PER_LINE];
-};
-
-
-struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,
- const char **req_files);
-int lnstat_update(struct lnstat_file *lnstat_files);
-int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files);
-struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,
- char *name);
-#endif /* _LNSTAT_H */
-/* lnstat.c: Unified linux network statistics
- *
- * Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
- *
- * Development of this code was funded by Astaro AG, http://www.astaro.com/
- *
- * Based on original concept and ideas from predecessor rtstat.c:
- *
- * Copyright 2001 by Robert Olsson <robert.olsson@its.uu.se>
- * Uppsala University, Sweden
- *
- * 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.
- *
- */
-
-#include <unistd.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <dirent.h>
-#include <limits.h>
-#include <time.h>
-
-#include <sys/time.h>
-#include <sys/types.h>
-
-#include "lnstat.h"
-
-/* size of temp buffer used to read lines from procfiles */
-#define FGETS_BUF_SIZE 1024
-
-
-#define RTSTAT_COMPAT_LINE "entries in_hit in_slow_tot in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"
-
-/* Read (and summarize for SMP) the different stats vars. */
-static int scan_lines(struct lnstat_file *lf, int i)
-{
- int j, num_lines = 0;
-
- for (j = 0; j < lf->num_fields; j++)
- lf->fields[j].values[i] = 0;
-
- while(!feof(lf->fp)) {
- char buf[FGETS_BUF_SIZE];
- char *ptr = buf;
-
- num_lines++;
-
- fgets(buf, sizeof(buf)-1, lf->fp);
- gettimeofday(&lf->last_read, NULL);
-
- for (j = 0; j < lf->num_fields; j++)
- lf->fields[j].values[i] = strtoul(ptr, &ptr, 16);
- }
- return num_lines;
-}
-
-static int time_after(struct timeval *last,
- struct timeval *tout,
- struct timeval *now)
-{
- if (now->tv_sec > last->tv_sec + tout->tv_sec)
- return 1;
-
- if (now->tv_sec == last->tv_sec + tout->tv_sec) {
- if (now->tv_usec > last->tv_usec + tout->tv_usec)
- return 1;
- }
-
- return 0;
-}
-
-int lnstat_update(struct lnstat_file *lnstat_files)
-{
- struct lnstat_file *lf;
- char buf[FGETS_BUF_SIZE];
- struct timeval tv;
-
- gettimeofday(&tv, NULL);
-
- for (lf = lnstat_files; lf; lf = lf->next) {
- if (time_after(&lf->last_read, &lf->interval, &tv)) {
- int i;
- struct lnstat_field *lfi;
-
- rewind(lf->fp);
- if (!lf->compat) {
- /* skip first line */
- fgets(buf, sizeof(buf)-1, lf->fp);
- }
- scan_lines(lf, 1);
-
- for (i = 0, lfi = &lf->fields[i];
- i < lf->num_fields; i++, lfi = &lf->fields[i]) {
- if (i == 0)
- lfi->result = lfi->values[1];
- else
- lfi->result = (lfi->values[1]-lfi->values[0])
- / lf->interval.tv_sec;
- }
-
- rewind(lf->fp);
- fgets(buf, sizeof(buf)-1, lf->fp);
- scan_lines(lf, 0);
- }
- }
-
- return 0;
-}
-
-/* scan first template line and fill in per-field data structures */
-static int __lnstat_scan_fields(struct lnstat_file *lf, char *buf)
-{
- char *tok;
- int i;
-
- tok = strtok(buf, " \t\n");
- for (i = 0; i < LNSTAT_MAX_FIELDS_PER_LINE; i++) {
- lf->fields[i].file = lf;
- strncpy(lf->fields[i].name, tok, LNSTAT_MAX_FIELD_NAME_LEN);
- /* has to be null-terminate since we initialize to zero
- * and field size is NAME_LEN + 1 */
- tok = strtok(NULL, " \t\n");
- if (!tok) {
- lf->num_fields = i+1;
- return 0;
- }
- }
- return 0;
-}
-
-static int lnstat_scan_fields(struct lnstat_file *lf)
-{
- char buf[FGETS_BUF_SIZE];
-
- rewind(lf->fp);
- fgets(buf, sizeof(buf)-1, lf->fp);
-
- return __lnstat_scan_fields(lf, buf);
-}
-
-/* fake function emulating lnstat_scan_fields() for old kernels */
-static int lnstat_scan_compat_rtstat_fields(struct lnstat_file *lf)
-{
- char buf[FGETS_BUF_SIZE];
-
- strncpy(buf, RTSTAT_COMPAT_LINE, sizeof(buf)-1);
-
- return __lnstat_scan_fields(lf, buf);
-}
-
-/* find out whether string 'name; is in given string array */
-static int name_in_array(const int num, const char **arr, const char *name)
-{
- int i;
- for (i = 0; i < num; i++) {
- if (!strcmp(arr[i], name))
- return 1;
- }
- return 0;
-}
-
-/* allocate lnstat_file and open given file */
-static struct lnstat_file *alloc_and_open(const char *path, const char *file)
-{
- struct lnstat_file *lf;
-
- /* allocate */
- lf = malloc(sizeof(*lf));
- if (!lf)
- return NULL;
-
- /* initialize */
- memset(lf, 0, sizeof(*lf));
-
- /* de->d_name is guaranteed to be <= NAME_MAX */
- strcpy(lf->basename, file);
- strcpy(lf->path, path);
- strcat(lf->path, "/");
- strcat(lf->path, lf->basename);
-
- /* initialize to default */
- lf->interval.tv_sec = 1;
-
- /* open */
- lf->fp = fopen(lf->path, "r");
- if (!lf->fp) {
- free(lf);
- return NULL;
- }
-
- return lf;
-}
-
-
-/* lnstat_scan_dir - find and parse all available statistics files/fields */
-struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,
- const char **req_files)
-{
- DIR *dir;
- struct lnstat_file *lnstat_files = NULL;
- struct dirent *de;
-
- if (!path)
- path = PROC_NET_STAT;
-
- dir = opendir(path);
- if (!dir) {
- struct lnstat_file *lf;
- /* Old kernel, before /proc/net/stat was introduced */
- fprintf(stderr, "Your kernel doesn't have lnstat support. ");
-
- /* we only support rtstat, not multiple files */
- if (num_req_files >= 2) {
- fputc('\n', stderr);
- return NULL;
- }
-
- /* we really only accept rt_cache */
- if (num_req_files && !name_in_array(num_req_files,
- req_files, "rt_cache")) {
- fputc('\n', stderr);
- return NULL;
- }
-
- fprintf(stderr, "Fallback to old rtstat-only operation\n");
-
- lf = alloc_and_open("/proc/net", "rt_cache_stat");
- if (!lf)
- return NULL;
- lf->compat = 1;
- strncpy(lf->basename, "rt_cache", sizeof(lf->basename));
-
- /* FIXME: support for old files */
- if (lnstat_scan_compat_rtstat_fields(lf) < 0)
- return NULL;
-
- lf->next = lnstat_files;
- lnstat_files = lf;
- return lnstat_files;
- }
-
- while ((de = readdir(dir))) {
- struct lnstat_file *lf;
-
- if (de->d_type != DT_REG)
- continue;
-
- if (num_req_files && !name_in_array(num_req_files,
- req_files, de->d_name))
- continue;
-
- lf = alloc_and_open(path, de->d_name);
- if (!lf)
- return NULL;
-
- /* fill in field structure */
- if (lnstat_scan_fields(lf) < 0)
- return NULL;
-
- /* prepend to global list */
- lf->next = lnstat_files;
- lnstat_files = lf;
- }
- closedir(dir);
-
- return lnstat_files;
-}
-
-int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files)
-{
- struct lnstat_file *lf;
-
- for (lf = lnstat_files; lf; lf = lf->next) {
- int i;
-
- fprintf(outfd, "%s:\n", lf->path);
-
- for (i = 0; i < lf->num_fields; i++)
- fprintf(outfd, "\t%2u: %s\n", i+1, lf->fields[i].name);
-
- }
- return 0;
-}
-
-struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,
- char *name)
-{
- struct lnstat_file *lf;
- struct lnstat_field *ret = NULL;
- char *colon = strchr(name, ':');
- char *file, *field;
-
- if (colon) {
- file = strndup(name, colon-name);
- field = colon+1;
- } else {
- file = NULL;
- field = name;
- }
-
- for (lf = lnstat_files; lf; lf = lf->next) {
- int i;
-
- if (file && strcmp(file, lf->basename))
- continue;
-
- for (i = 0; i < lf->num_fields; i++) {
- if (!strcmp(field, lf->fields[i].name)) {
- ret = &lf->fields[i];
- goto out;
- }
- }
- }
-out:
- if (file)
- free(file);
-
- return ret;
-}
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