/* $Id: bwbar.c,v 1.7 2006/08/26 16:31:26 hpa Exp $ */
/* ----------------------------------------------------------------------- *
*
* Copyright 1999-2006 H. Peter Anvin - All Rights Reserved
*
* 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, Inc., 675 Mass Ave, Cambridge MA 02139,
* USA; either version 2 of the License, or (at your option) any later
* version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* bwbar.c
*
* Bandwidth monitor using /proc/net/dev which produces output which can
* be displayed on a web page.
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <alloca.h>
#include <getopt.h>
#include <png.h>
void skipline(FILE *f)
{
int ch;
do {
ch = getc(f);
} while ( ch != '\n' && ch != EOF );
}
int write_bar_graph(FILE *f, double perc, int width, int height, int border, int spacers)
{
static png_color palette[4] =
{
{ 0, 0, 0}, /* RGB color for border */
{255, 255, 255}, /* RGB color for separators */
{214, 136, 131}, /* RGB color for unfilled part of graph */
{204, 204, 227}, /* RGB color for filled part of graph */
};
int bwidth, bheight; /* Width and height including border */
double frac;
int spacer, fspacer;
int x, y;
int color;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
png_byte *border_row;
png_byte *bar_row;
png_byte *bp;
int status = 1; /* Assume failure */
bwidth = width + border*2;
bheight = height + border*2;
border_row = alloca(sizeof(png_byte) * bwidth);
bar_row = alloca(sizeof(png_byte) * bwidth);
if ( !border_row || !bar_row )
goto barf;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL);
if ( !png_ptr )
goto barf;
info_ptr = png_create_info_struct(png_ptr);
if ( !info_ptr )
goto barf;
if ( setjmp(png_ptr->jmpbuf) ) {
status = 1;
goto barf; /* libpng abort */
}
png_init_io(png_ptr, f);
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
png_set_IHDR(png_ptr, info_ptr, bwidth, bheight,
2, PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_set_PLTE(png_ptr, info_ptr, palette, 4);
png_write_info(png_ptr, info_ptr);
png_set_packing(png_ptr);
/* Now we actually produce the data */
/* Generate the border row */
memset(border_row, 0, bwidth);
/* Generate the bar row */
bp = bar_row;
for ( x = 0 ; x < border ; x++ )
*bp++ = 0; /* Border color */
spacer = 0;
for ( x = 1 ; x <= width ; x++ ) {
frac = (double)x/(double)width;
fspacer = (int)(spacers*frac);
if ( x < width && spacer < fspacer ) {
color = 1; /* Spacer color */
} else if ( perc < frac ) {
color = 3; /* Bar color */
} else {
color = 2; /* Background color */
}
*bp++ = color;
spacer = fspacer;
}
for ( x = 0 ; x < border ; x++ )
*bp++ = 0; /* Border color */
/* Write output */
for ( y = 0 ; y < border ; y++ )
png_write_row(png_ptr, border_row);
for ( y = 0 ; y < height ; y++ )
png_write_row(png_ptr, bar_row);
for ( y = 0 ; y < border ; y++ )
png_write_row(png_ptr, border_row);
/* Done writing */
png_write_end(png_ptr, info_ptr);
status = 0; /* Success! */
barf: /* Jump here on fatal error */
png_destroy_write_struct(&png_ptr, &info_ptr);
return status;
}
const struct option longopts[] = {
{ "input", 0, 0, 'i' },
{ "output", 0, 0, 'o' },
{ "text-file", 1, 0, 'f' },
{ "png-file", 1, 0, 'p' },
{ "interval", 1, 0, 't' },
{ "width", 1, 0, 'x' },
{ "height", 1, 0, 'y' },
{ "border", 1, 0, 'b' },
{ "kbps", 0, 0, 'k' },
{ "Mbps", 0, 0, 'M' },
{ "Gbps", 0, 0, 'G' },
{ "help", 0, 0, 'h' },
{ 0, 0, 0, 0 }
};
const char *program;
void usage(int err)
{
fprintf(stderr,
"Usage: %s [options] interface max_mbps\n"
"Options: (defaults in parenthesis)\n"
" --input -i Measure input bandwidth\n"
" --output -o Measure output bandwidth (default)\n"
" --text-file <file> -f The name of the text output file (ubar.txt)\n"
" --png-file <file> -p The name of the graphical bar file (ubar.png)\n"
" --interval <seconds> -t The poll interval in seconds (15)\n"
" --width <pixels> -x Width of the graphical bar (600)\n"
" --height <pixels> -y Height of the graphical bar (4)\n"
" --border <pixels> -b Border width of the graphical bar (1)\n"
" --kbps -k Bandwidth is measured in kbit/s\n"
" --Mbps -M Bandwidth is measured in Mbit/s (default)\n"
" --Gbps -G Bandwidth is measured in Gbit/s\n"
" --help -h Display this text\n",
program);
exit(err);
}
int main(int argc, char *argv[])
{
FILE *pnd;
char *interface;
struct ifinfo {
char name[8];
unsigned int r_bytes, r_pkt, r_err, r_drop, r_fifo, r_frame;
unsigned int r_compr, r_mcast;
unsigned int x_bytes, x_pkt, x_err, x_drop, x_fifo, x_coll;
unsigned int x_carrier, x_compr;
} ifc;
unsigned long long bin, bout, lbin, lbout;
int first;
struct timeval t_now, t_last;
double maxbandwidth;
double bwin, bwout, bwmeasure, timedelta;
int opt;
char *t_tmp, *g_tmp;
/* Options */
int measure_input = 0; /* Input instead of output */
char *text_file = "ubar.txt"; /* Text filename */
char *graphics_file = "ubar.png"; /* Graphics filename */
char *unit_name = "Mbit/s"; /* Unit name */
double unit = 1.0e+6; /* Unit multiplier */
int interval = 15; /* Interval between measurements (s) */
int width = 600; /* Bar width */
int height = 4; /* Bar height */
int border = 1; /* Bar border */
program = argv[0];
while ( (opt = getopt_long(argc, argv, "iof:p:t:x:y:b:kMGh", longopts, NULL)) != -1 ) {
switch ( opt ) {
case 'i':
measure_input = 1;
break;
case 'o':
measure_input = 0;
break;
case 'f':
text_file = optarg;
break;
case 'p':
graphics_file = optarg;
break;
case 't':
interval = atoi(optarg);
break;
case 'x':
width = atoi(optarg);
break;
case 'y':
height = atoi(optarg);
break;
case 'b':
border = atoi(optarg);
break;
case 'k':
unit = 1.0e+3;
unit_name = "kbit/s";
break;
case 'M':
unit = 1.0e+6;
unit_name = "Mbit/s";
break;
case 'G':
unit = 1.0e+9;
unit_name = "Gbit/s";
break;
case 'h':
usage(0);
break;
default:
usage(1);
break;
}
}
if ( argc-optind != 2 )
usage(1);
t_tmp = malloc(strlen(text_file) + 5);
g_tmp = malloc(strlen(graphics_file) + 5);
if ( !t_tmp || !g_tmp ) {
perror(program);
exit(1);
}
sprintf(t_tmp, "%s.tmp", text_file);
sprintf(g_tmp, "%s.tmp", graphics_file);
interface = argv[optind];
maxbandwidth = atof(argv[optind+1]) * unit;
first = 1;
lbin = 0; lbout = 0;
gettimeofday(&t_last, NULL);
while ( 1 ) {
/**** Begin code that obtains bandwidth data ****/
gettimeofday(&t_now, NULL);
pnd = fopen("/proc/net/dev", "r");
if ( !pnd ) {
fprintf(stderr, "%s: /proc/net/dev: %s", argv[0], strerror(errno));
exit(1);
}
/* Skip header */
skipline(pnd);
skipline(pnd);
/* Get interface info */
do {
if ( fscanf(pnd, " %6[^:]:%u %u %u %u %u %u %u %u %u %u %u %u %u %u %u %u",
ifc.name,
&ifc.r_bytes, &ifc.r_pkt, &ifc.r_err, &ifc.r_drop,
&ifc.r_fifo, &ifc.r_frame, &ifc.r_compr, &ifc.r_mcast,
&ifc.x_bytes, &ifc.x_pkt, &ifc.x_err, &ifc.x_drop,
&ifc.x_fifo, &ifc.x_coll, &ifc.x_carrier, &ifc.x_compr)
!= 17 ) {
exit(200);
}
skipline(pnd);
} while ( strcmp(ifc.name, interface) );
bin = ifc.r_bytes + (lbin & ~0xffffffffULL);
bout = ifc.x_bytes + (lbout & ~0xffffffffULL);
if ( bin < lbin )
bin += (1ULL << 32);
if ( bout < lbout )
bout += (1ULL << 32);
/**** Begin code that generates output ****/
if ( !first ) {
FILE *ubar, *pngmaker;
timedelta = (double)(t_now.tv_sec - t_last.tv_sec) +
(t_now.tv_usec - t_last.tv_usec)/1.0e+6;
bwin = (bin-lbin)*8/timedelta;
bwout = (bout-lbout)*8/timedelta;
bwmeasure = measure_input ? bwin : bwout;
ubar = fopen(t_tmp, "w");
pngmaker = fopen(g_tmp, "w");
if ( ubar ) {
fprintf(ubar, "Current bandwidth utilization %6.2f %s\n", bwmeasure/unit, unit_name);
fclose(ubar);
rename(t_tmp, text_file);
}
if ( pngmaker ) {
write_bar_graph(pngmaker, bwmeasure/maxbandwidth, width, height, border, 5);
fclose(pngmaker);
rename(g_tmp, graphics_file);
}
} else {
first = 0;
}
lbin = bin; lbout = bout; t_last = t_now;
fclose(pnd);
sleep(interval);
}
}