+++ /dev/null
-/* 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++) {
- unsigned long f = strtoul(ptr, &ptr, 16);
- if (j == 0)
- lf->fields[j].values[i] = f;
- else
- lf->fields[j].values[i] += f;
- }
- }
- 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,
- const char *name)
-{
- struct lnstat_file *lf;
- struct lnstat_field *ret = NULL;
- const char *colon = strchr(name, ':');
- char *file;
- const char *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;
-}
git://git.onelab.eu / iproute2.git / blobdiff