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331 lines
7.1 KiB
331 lines
7.1 KiB
/* lnstat.c: Unified linux network statistics
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*
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* Copyright (C) 2004 by Harald Welte <laforge@gnumonks.org>
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*
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* Development of this code was funded by Astaro AG, http://www.astaro.com/
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*
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* Based on original concept and ideas from predecessor rtstat.c:
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*
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* Copyright 2001 by Robert Olsson <robert.olsson@its.uu.se>
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* Uppsala University, Sweden
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <dirent.h>
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#include <limits.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include "lnstat.h"
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/* size of temp buffer used to read lines from procfiles */
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#define FGETS_BUF_SIZE 1024
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#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"
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/* Read (and summarize for SMP) the different stats vars. */
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static int scan_lines(struct lnstat_file *lf, int i)
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{
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char buf[FGETS_BUF_SIZE];
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int j, num_lines = 0;
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for (j = 0; j < lf->num_fields; j++)
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lf->fields[j].values[i] = 0;
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rewind(lf->fp);
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/* skip first line */
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if (!lf->compat && !fgets(buf, sizeof(buf)-1, lf->fp))
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return -1;
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while (!feof(lf->fp) && fgets(buf, sizeof(buf)-1, lf->fp)) {
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char *ptr = buf;
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num_lines++;
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gettimeofday(&lf->last_read, NULL);
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for (j = 0; j < lf->num_fields; j++) {
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unsigned long f = strtoul(ptr, &ptr, 16);
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if (j == 0)
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lf->fields[j].values[i] = f;
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else
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lf->fields[j].values[i] += f;
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}
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}
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return num_lines;
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}
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static int time_after(struct timeval *last,
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struct timeval *tout,
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struct timeval *now)
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{
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if (now->tv_sec > last->tv_sec + tout->tv_sec)
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return 1;
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if (now->tv_sec == last->tv_sec + tout->tv_sec) {
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if (now->tv_usec > last->tv_usec + tout->tv_usec)
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return 1;
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}
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return 0;
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}
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int lnstat_update(struct lnstat_file *lnstat_files)
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{
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struct lnstat_file *lf;
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struct timeval tv;
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gettimeofday(&tv, NULL);
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for (lf = lnstat_files; lf; lf = lf->next) {
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if (time_after(&lf->last_read, &lf->interval, &tv)) {
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int i;
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struct lnstat_field *lfi;
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scan_lines(lf, 1);
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for (i = 0, lfi = &lf->fields[i];
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i < lf->num_fields; i++, lfi = &lf->fields[i]) {
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if (i == 0)
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lfi->result = lfi->values[1];
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else
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lfi->result = (lfi->values[1]-lfi->values[0])
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/ lf->interval.tv_sec;
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}
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scan_lines(lf, 0);
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}
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}
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return 0;
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}
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/* scan first template line and fill in per-field data structures */
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static int __lnstat_scan_fields(struct lnstat_file *lf, char *buf)
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{
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char *tok;
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int i;
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tok = strtok(buf, " \t\n");
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for (i = 0; i < LNSTAT_MAX_FIELDS_PER_LINE; i++) {
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lf->fields[i].file = lf;
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strncpy(lf->fields[i].name, tok, LNSTAT_MAX_FIELD_NAME_LEN);
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/* has to be null-terminate since we initialize to zero
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* and field size is NAME_LEN + 1 */
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tok = strtok(NULL, " \t\n");
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if (!tok) {
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lf->num_fields = i+1;
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return 0;
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}
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}
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return 0;
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}
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static int lnstat_scan_fields(struct lnstat_file *lf)
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{
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char buf[FGETS_BUF_SIZE];
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rewind(lf->fp);
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if (!fgets(buf, sizeof(buf)-1, lf->fp))
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return -1;
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return __lnstat_scan_fields(lf, buf);
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}
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/* fake function emulating lnstat_scan_fields() for old kernels */
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static int lnstat_scan_compat_rtstat_fields(struct lnstat_file *lf)
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{
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char buf[FGETS_BUF_SIZE];
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strncpy(buf, RTSTAT_COMPAT_LINE, sizeof(buf) - 1);
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buf[sizeof(buf) - 1] = '\0';
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return __lnstat_scan_fields(lf, buf);
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}
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/* find out whether string 'name; is in given string array */
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static int name_in_array(const int num, const char **arr, const char *name)
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{
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int i;
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for (i = 0; i < num; i++) {
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if (!strcmp(arr[i], name))
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return 1;
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}
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return 0;
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}
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/* allocate lnstat_file and open given file */
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static struct lnstat_file *alloc_and_open(const char *path, const char *file)
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{
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struct lnstat_file *lf;
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/* allocate */
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lf = calloc(1, sizeof(*lf));
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if (!lf) {
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fprintf(stderr, "out of memory\n");
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return NULL;
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}
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/* initialize */
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snprintf(lf->basename, sizeof(lf->basename), "%s", file);
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snprintf(lf->path, sizeof(lf->path), "%s/%s", path, file);
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/* initialize to default */
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lf->interval.tv_sec = 1;
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/* open */
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lf->fp = fopen(lf->path, "r");
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if (!lf->fp) {
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perror(lf->path);
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free(lf);
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return NULL;
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}
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return lf;
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}
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/* lnstat_scan_dir - find and parse all available statistics files/fields */
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struct lnstat_file *lnstat_scan_dir(const char *path, const int num_req_files,
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const char **req_files)
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{
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DIR *dir;
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struct lnstat_file *lnstat_files = NULL;
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struct dirent *de;
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if (!path)
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path = PROC_NET_STAT;
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dir = opendir(path);
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if (!dir) {
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struct lnstat_file *lf;
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/* Old kernel, before /proc/net/stat was introduced */
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fprintf(stderr, "Your kernel doesn't have lnstat support. ");
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/* we only support rtstat, not multiple files */
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if (num_req_files >= 2) {
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fputc('\n', stderr);
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return NULL;
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}
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/* we really only accept rt_cache */
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if (num_req_files && !name_in_array(num_req_files,
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req_files, "rt_cache")) {
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fputc('\n', stderr);
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return NULL;
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}
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fprintf(stderr, "Fallback to old rtstat-only operation\n");
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lf = alloc_and_open("/proc/net", "rt_cache_stat");
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if (!lf)
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return NULL;
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lf->compat = 1;
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strncpy(lf->basename, "rt_cache", sizeof(lf->basename));
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/* FIXME: support for old files */
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if (lnstat_scan_compat_rtstat_fields(lf) < 0)
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return NULL;
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lf->next = lnstat_files;
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lnstat_files = lf;
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return lnstat_files;
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}
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while ((de = readdir(dir))) {
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struct lnstat_file *lf;
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if (de->d_type != DT_REG)
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continue;
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if (num_req_files && !name_in_array(num_req_files,
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req_files, de->d_name))
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continue;
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lf = alloc_and_open(path, de->d_name);
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if (!lf) {
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closedir(dir);
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return NULL;
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}
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/* fill in field structure */
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if (lnstat_scan_fields(lf) < 0) {
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closedir(dir);
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return NULL;
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}
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/* prepend to global list */
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lf->next = lnstat_files;
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lnstat_files = lf;
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}
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closedir(dir);
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return lnstat_files;
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}
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int lnstat_dump(FILE *outfd, struct lnstat_file *lnstat_files)
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{
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struct lnstat_file *lf;
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for (lf = lnstat_files; lf; lf = lf->next) {
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int i;
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fprintf(outfd, "%s:\n", lf->path);
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for (i = 0; i < lf->num_fields; i++)
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fprintf(outfd, "\t%2u: %s\n", i+1, lf->fields[i].name);
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}
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return 0;
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}
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struct lnstat_field *lnstat_find_field(struct lnstat_file *lnstat_files,
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const char *name)
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{
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struct lnstat_file *lf;
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struct lnstat_field *ret = NULL;
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const char *colon = strchr(name, ':');
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char *file;
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const char *field;
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if (colon) {
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file = strndup(name, colon-name);
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field = colon+1;
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} else {
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file = NULL;
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field = name;
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}
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for (lf = lnstat_files; lf; lf = lf->next) {
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int i;
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if (file && strcmp(file, lf->basename))
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continue;
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for (i = 0; i < lf->num_fields; i++) {
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if (!strcmp(field, lf->fields[i].name)) {
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ret = &lf->fields[i];
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goto out;
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}
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}
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}
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out:
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free(file);
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return ret;
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}
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