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468dec75a5
The lnstat program was building a format string, then using it. This was safe, but simpler to just use format character * to get width.
385 lines
8.7 KiB
C
385 lines
8.7 KiB
C
/* lnstat - 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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/* Maximum number of fields that can be displayed */
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#define MAX_FIELDS 128
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/* Maximum number of header lines */
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#define HDR_LINES 10
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/* default field width if none specified */
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#define FIELD_WIDTH_DEFAULT 8
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#define FIELD_WIDTH_MAX 20
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#define DEFAULT_INTERVAL 2
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#define HDR_LINE_LENGTH (MAX_FIELDS*FIELD_WIDTH_MAX)
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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 <getopt.h>
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#include "lnstat.h"
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static struct option opts[] = {
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{ "version", 0, NULL, 'V' },
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{ "count", 1, NULL, 'c' },
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{ "dump", 0, NULL, 'd' },
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{ "json", 0, NULL, 'j' },
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{ "file", 1, NULL, 'f' },
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{ "help", 0, NULL, 'h' },
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{ "interval", 1, NULL, 'i' },
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{ "keys", 1, NULL, 'k' },
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{ "subject", 1, NULL, 's' },
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{ "width", 1, NULL, 'w' },
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};
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static int usage(char *name, int exit_code)
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{
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fprintf(stderr, "%s Version %s\n", name, LNSTAT_VERSION);
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fprintf(stderr, "Copyright (C) 2004 by Harald Welte "
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"<laforge@gnumonks.org>\n");
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fprintf(stderr, "This program is free software licensed under GNU GPLv2"
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"\nwith ABSOLUTELY NO WARRANTY.\n\n");
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fprintf(stderr, "Parameters:\n");
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fprintf(stderr, "\t-V --version\t\tPrint Version of Program\n");
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fprintf(stderr, "\t-c --count <count>\t"
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"Print <count> number of intervals\n");
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fprintf(stderr, "\t-d --dump\t\t"
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"Dump list of available files/keys\n");
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fprintf(stderr, "\t-j --json\t\t"
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"Display in JSON format\n");
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fprintf(stderr, "\t-f --file <file>\tStatistics file to use\n");
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fprintf(stderr, "\t-h --help\t\tThis help message\n");
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fprintf(stderr, "\t-i --interval <intv>\t"
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"Set interval to 'intv' seconds\n");
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fprintf(stderr, "\t-k --keys k,k,k,...\tDisplay only keys specified\n");
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fprintf(stderr, "\t-s --subject [0-2]\t?\n");
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fprintf(stderr, "\t-w --width n,n,n,...\tWidth for each field\n");
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fprintf(stderr, "\n");
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exit(exit_code);
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}
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struct field_param {
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const char *name;
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struct lnstat_field *lf;
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struct {
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unsigned int width;
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} print;
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};
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struct field_params {
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unsigned int num;
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struct field_param params[MAX_FIELDS];
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};
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static void print_line(FILE *of, const struct lnstat_file *lnstat_files,
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const struct field_params *fp)
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{
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int i;
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for (i = 0; i < fp->num; i++) {
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const struct lnstat_field *lf = fp->params[i].lf;
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fprintf(of, "%*lu|", fp->params[i].print.width, lf->result);
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}
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fputc('\n', of);
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}
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static void print_json(FILE *of, const struct lnstat_file *lnstat_files,
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const struct field_params *fp)
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{
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int i;
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const char *sep;
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const char *base = NULL;
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fputs("{\n", of);
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for (i = 0; i < fp->num; i++) {
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const struct lnstat_field *lf = fp->params[i].lf;
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if (!base || lf->file->basename != base) {
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if (base) fputs("},\n", of);
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base = lf->file->basename;
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sep = "\n\t";
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fprintf(of, " \"%s\":{", base);
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}
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fprintf(of, "%s\"%s\":%lu", sep,
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lf->name, lf->result);
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sep = ",\n\t";
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}
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fputs("}\n}\n", of);
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}
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/* find lnstat_field according to user specification */
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static int map_field_params(struct lnstat_file *lnstat_files,
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struct field_params *fps, int interval)
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{
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int i, j = 0;
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struct lnstat_file *lf;
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/* no field specification on commandline, need to build default */
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if (!fps->num) {
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for (lf = lnstat_files; lf; lf = lf->next) {
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for (i = 0; i < lf->num_fields; i++) {
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fps->params[j].lf = &lf->fields[i];
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fps->params[j].lf->file->interval.tv_sec =
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interval;
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if (!fps->params[j].print.width)
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fps->params[j].print.width =
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FIELD_WIDTH_DEFAULT;
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if (++j >= MAX_FIELDS - 1) {
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fprintf(stderr,
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"WARN: MAX_FIELDS (%d) reached,"
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" truncating number of keys\n",
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MAX_FIELDS);
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goto full;
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}
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}
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}
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full:
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fps->num = j;
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return 1;
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}
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for (i = 0; i < fps->num; i++) {
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fps->params[i].lf = lnstat_find_field(lnstat_files,
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fps->params[i].name);
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if (!fps->params[i].lf) {
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fprintf(stderr, "Field `%s' unknown\n",
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fps->params[i].name);
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return 0;
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}
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fps->params[i].lf->file->interval.tv_sec = interval;
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if (!fps->params[i].print.width)
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fps->params[i].print.width = FIELD_WIDTH_DEFAULT;
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}
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return 1;
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}
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struct table_hdr {
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int num_lines;
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char *hdr[HDR_LINES];
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};
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static struct table_hdr *build_hdr_string(struct lnstat_file *lnstat_files,
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struct field_params *fps,
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int linewidth)
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{
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int h,i;
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static struct table_hdr th;
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int ofs = 0;
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for (i = 0; i < HDR_LINES; i++) {
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th.hdr[i] = malloc(HDR_LINE_LENGTH);
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memset(th.hdr[i], 0, HDR_LINE_LENGTH);
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}
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for (i = 0; i < fps->num; i++) {
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char *cname, *fname = fps->params[i].lf->name;
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unsigned int width = fps->params[i].print.width;
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snprintf(th.hdr[0]+ofs, width+2, "%*.*s|", width, width,
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fps->params[i].lf->file->basename);
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cname = fname;
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for (h = 1; h < HDR_LINES; h++) {
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if (cname - fname >= strlen(fname))
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snprintf(th.hdr[h]+ofs, width+2,
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"%*.*s|", width, width, "");
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else {
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th.num_lines = h+1;
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snprintf(th.hdr[h]+ofs, width+2,
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"%*.*s|", width, width, cname);
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}
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cname += width;
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}
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ofs += width+1;
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}
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/* fill in spaces */
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for (h = 1; h <= th.num_lines; h++) {
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for (i = 0; i < ofs; i++) {
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if (th.hdr[h][i] == '\0')
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th.hdr[h][i] = ' ';
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}
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}
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return &th;
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}
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static int print_hdr(FILE *of, struct table_hdr *th)
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{
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int i;
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for (i = 0; i < th->num_lines; i++) {
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fputs(th->hdr[i], of);
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fputc('\n', of);
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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struct lnstat_file *lnstat_files;
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const char *basename;
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int i, c;
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int interval = DEFAULT_INTERVAL;
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int hdr = 2;
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enum {
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MODE_DUMP,
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MODE_JSON,
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MODE_NORMAL,
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} mode = MODE_NORMAL;
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unsigned long count = 1;
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struct table_hdr *header;
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static struct field_params fp;
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int num_req_files = 0;
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char *req_files[LNSTAT_MAX_FILES];
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/* backwards compatibility mode for old tools */
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basename = strrchr(argv[0], '/');
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if (basename)
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basename += 1; /* name after slash */
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else
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basename = argv[0]; /* no slash */
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if (!strcmp(basename, "rtstat")) {
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/* rtstat compatibility mode */
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req_files[0] = "rt_cache";
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num_req_files = 1;
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} else if (!strcmp(basename, "ctstat")) {
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/* ctstat compatibility mode */
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req_files[0] = "ip_conntrack";
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num_req_files = 1;
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}
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while ((c = getopt_long(argc, argv,"Vc:djf:h?i:k:s:w:",
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opts, NULL)) != -1) {
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int len = 0;
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char *tmp, *tok;
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switch (c) {
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case 'c':
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count = strtoul(optarg, NULL, 0);
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break;
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case 'd':
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mode = MODE_DUMP;
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break;
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case 'j':
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mode = MODE_JSON;
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break;
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case 'f':
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req_files[num_req_files++] = strdup(optarg);
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break;
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case '?':
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case 'h':
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usage(argv[0], 0);
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break;
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case 'i':
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sscanf(optarg, "%u", &interval);
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break;
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case 'k':
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tmp = strdup(optarg);
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if (!tmp)
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break;
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for (tok = strtok(tmp, ",");
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tok;
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tok = strtok(NULL, ",")) {
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if (fp.num >= MAX_FIELDS) {
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fprintf(stderr,
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"WARN: too many keys"
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" requested: (%d max)\n",
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MAX_FIELDS);
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break;
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}
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fp.params[fp.num++].name = tok;
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}
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break;
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case 's':
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sscanf(optarg, "%u", &hdr);
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break;
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case 'w':
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tmp = strdup(optarg);
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if (!tmp)
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break;
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i = 0;
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for (tok = strtok(tmp, ",");
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tok;
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tok = strtok(NULL, ",")) {
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len = strtoul(tok, NULL, 0);
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if (len > FIELD_WIDTH_MAX)
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len = FIELD_WIDTH_MAX;
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fp.params[i].print.width = len;
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i++;
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}
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if (i == 1) {
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for (i = 0; i < MAX_FIELDS; i++)
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fp.params[i].print.width = len;
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}
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break;
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default:
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usage(argv[0], 1);
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break;
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}
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}
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lnstat_files = lnstat_scan_dir(PROC_NET_STAT, num_req_files,
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(const char **) req_files);
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switch (mode) {
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case MODE_DUMP:
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lnstat_dump(stderr, lnstat_files);
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break;
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case MODE_NORMAL:
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case MODE_JSON:
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if (!map_field_params(lnstat_files, &fp, interval))
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exit(1);
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header = build_hdr_string(lnstat_files, &fp, 80);
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if (!header)
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exit(1);
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if (interval < 1 )
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interval = 1;
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for (i = 0; i < count; i++) {
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lnstat_update(lnstat_files);
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if (mode == MODE_JSON)
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print_json(stdout, lnstat_files, &fp);
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else {
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if ((hdr > 1 &&
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(! (i % 20))) || (hdr == 1 && i == 0))
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print_hdr(stdout, header);
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print_line(stdout, lnstat_files, &fp);
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}
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fflush(stdout);
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if (i < count - 1)
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sleep(interval);
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}
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break;
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}
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return 1;
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}
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