+/* 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,
+ 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;
+}
projects / lisovros / iproute2_canprio.git / commitdiff