blob: d918151282f5510f0ce45a14ff29a96fec8cbe77 [file] [log] [blame]
/* 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)
{
char buf[FGETS_BUF_SIZE];
int j, num_lines = 0;
for (j = 0; j < lf->num_fields; j++)
lf->fields[j].values[i] = 0;
rewind(lf->fp);
/* skip first line */
if (!lf->compat && !fgets(buf, sizeof(buf)-1, lf->fp))
return -1;
while (!feof(lf->fp) && fgets(buf, sizeof(buf)-1, lf->fp)) {
char *ptr = buf;
num_lines++;
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;
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;
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;
}
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);
if (!fgets(buf, sizeof(buf)-1, lf->fp))
return -1;
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) {
fprintf(stderr, "out of memory\n");
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) {
perror(lf->path);
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) {
closedir(dir);
return NULL;
}
/* fill in field structure */
if (lnstat_scan_fields(lf) < 0) {
closedir(dir);
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:
free(file);
return ret;
}