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#include <getopt.h>
#include <signal.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <unistd.h>
#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#define PROC_NET_DEV "/proc/net/dev"
struct iface {
char interface[IFNAMSIZ];
struct timeval timestamp;
unsigned long long rx_bytes;
unsigned long long tx_bytes;
};
volatile bool q = false;
bool use_bits = false;
struct iface *interfaces = NULL;
size_t no_iface = 0;
void endHandler(int signum) {
q = true;
}
void print_bps(double bytesPerSecond) {
const char* prefixes[] = { "", "k", "M", "G", "T", "P", "E", "Z", "Y" };
// Calculate the value
double value;
const char* unit;
if(use_bits) {
value = bytesPerSecond * 8;
unit = "b/s";
}
else {
value = bytesPerSecond;
unit = "B/s";
}
// Choose the prefix
unsigned prefix = 0;
while (prefix < (sizeof(prefixes) / sizeof(const char*)) && value > 1000.) {
value /= 1000.;
++prefix;
}
// Format the string
printf("%.2f %s%s", value, prefixes[prefix], unit);
}
void print_stats() {
// Open /proc/net/dev
FILE *dev = fopen(PROC_NET_DEV, "r");
if (!dev) {
fprintf(stderr, "cannot open %s - %s\n", PROC_NET_DEV, strerror(errno));
exit(EXIT_FAILURE);
}
// Read /proc/dev/net
while (!feof(dev)) {
char buf[512];
char *name, *statistics_string;
long long unsigned rx_bytes, tx_bytes;
struct timezone unused_timezone;
struct timeval timestamp;
// Read a line
fgets(buf, sizeof(buf), dev);
// get timestamp
gettimeofday(×tamp, &unused_timezone);
// Find the colon separating the name from the statistics
statistics_string = strchr(buf, ':');
if (!statistics_string) continue;
// Get a pointer to the statistics
*statistics_string = 0;
++statistics_string;
// Remove leading whitespace from the name
name = buf;
ptrdiff_t len = 0;
while (*name == ' ' || *name == '\t') {
++name;
}
len = name - buf;
// Parse the statistics, alls well, then get this shit going, otherwise f it.
if (sscanf(statistics_string, "%Lu %*Lu %*Lu %*Lu %*Lu %*Lu %*Lu %*Lu %Lu",
&rx_bytes, &tx_bytes) == 2) {
size_t i = 0;
bool found = false;
if(interfaces == NULL) {
goto skip;
}
for(i = 0; i < no_iface; i++) {
// if it exists in our interfaces, great. reuse the iface struct
if(strncmp(name, interfaces[i].interface, len) == 0) {
found = true;
break;
}
}
skip:
if(found) {
double timeDelta, rx_speed, tx_speed = 0;
// print our new speeds
timeDelta = (timestamp.tv_sec - interfaces[i].timestamp.tv_sec) * 1.0 +
(timestamp.tv_usec - interfaces[i].timestamp.tv_usec) * .000001;
rx_speed = (rx_bytes - interfaces[i].rx_bytes) / timeDelta;
tx_speed = (tx_bytes - interfaces[i].tx_bytes) / timeDelta;
printf("%s (", interfaces[i].interface);
print_bps(rx_speed);
printf(", ");
print_bps(tx_speed);
printf(")\t");
// update our interface
strcpy(interfaces[i].interface, name);
interfaces[i].rx_bytes = rx_bytes;
interfaces[i].timestamp = timestamp;
interfaces[i].tx_bytes = tx_bytes;
}
else {
interfaces = realloc(interfaces, sizeof(struct iface) * (no_iface + 1));
if(interfaces == NULL) {
fprintf(stderr, "Error: %s\n", strerror(errno));
exit(1);
}
strcpy(interfaces[no_iface].interface, name);
interfaces[no_iface].rx_bytes = rx_bytes;
interfaces[no_iface].tx_bytes = tx_bytes;
no_iface++;
}
}
}
// Close the file
fclose(dev);
}
int main(int argc, char **argv) {
// parse the command line
int c;
int interval = 10 * 100000;
while ((c = getopt (argc, argv, "bi:hv")) != -1)
switch (c)
{
case 'b':
use_bits = true;
break;
case 'i':
// Magic numbers? fuck it that's not a magic number, that's a 'real' number.
interval = atoi(optarg) * 100000;
break;
case 'h':
printf("USAGE: fsbm, -b specifies bits, -i sets interval in 10ths of seconds, 1 sec default\n");
exit(EXIT_SUCCESS);
break;
case 'v':
printf("Version 1\n");
exit(EXIT_SUCCESS);
break;
case '?':
fprintf(stderr,"bad flag\n");
break;
default:
exit(EXIT_FAILURE);
}
// Catch SIGINT
signal(SIGINT, endHandler);
// populate first.
print_stats();
while (!q) {
print_stats();
printf("\n");
usleep(interval);
}
return EXIT_SUCCESS;
}
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