i3blocks/bandwidth2.c
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#define RED "#FF7373"
#define ORANGE "#FFA500"
typedef unsigned long long int ulli;
enum {
STATE_OK,
STATE_WARNING,
STATE_CRITICAL,
STATE_UNKNOWN,
};
void usage(char *argv[])
{
printf("Usage: %s [-b|B] [-t seconds] [-i interface] [-w Bytes:Bytes] [-c Bytes:Bytes] [-h]\n", argv[0]);
printf("\n");
printf("-b \t\tuse bits/s\n");
printf("-B \t\tuse Bytes/s (default)\n");
printf("-t seconds\trefresh time (default is 1)\n");
printf("-i interface\tnetwork interface to monitor. If not specified, check all interfaces.\n");
printf("-w Bytes:Bytes\tSet warning (color orange) for Rx:Tx bandwidth. (default: none)\n");
printf("-c Bytes:Bytes\tSet critical (color red) for Rx:Tx bandwidth. (default: none)\n");
printf("-h \t\tthis help\n");
printf("\n");
}
void get_values(char *const iface, time_t * const s, ulli * const received, ulli * const sent)
{
FILE *f;
f = fopen("/proc/net/dev", "r");
if (!f) {
fprintf(stderr, "Can't open /proc/net/dev\n");
exit(STATE_UNKNOWN);
}
ulli temp_r, temp_s;
char line[BUFSIZ];
char ifname[BUFSIZ];
*received = 0;
*sent = 0;
while (fgets(line, BUFSIZ - 1, f) != NULL) {
if (sscanf(line, "%s %llu %*u %*u %*u %*u %*u %*u %*u %llu", ifname, &temp_r, &temp_s) == 3) {
if (iface && strcmp(iface, ifname) != 0) {
continue;
}
if (strcmp(ifname, "lo:") == 0)
continue;
*received = *received + temp_r;
*sent = *sent + temp_s;
}
}
fclose(f);
*s = time(NULL);
if (!s) {
fprintf(stderr, "Can't get Epoch time\n");
exit(STATE_UNKNOWN);
}
}
void display(int const unit, double b, int const warning, int const critical)
{
if (critical != 0 && b > critical) {
printf("<span color='%s'>", RED);
} else if (warning != 0 && b > warning) {
printf("<span color='%s'>", ORANGE);
} else {
printf("<span>");
}
if (unit == 'b')
b = b * 8;
if (b < 1024) {
printf("%5.1lf %c/s", b, unit);
} else if (b < 1024 * 1024) {
printf("%5.1lf K%c/s", b / 1024, unit);
} else if (b < 1024 * 1024 * 1024) {
printf("%5.1lf M%c/s", b / (1024 * 1024), unit);
} else {
printf("%5.1lf G%c/s", b / (1024 * 1024 * 1024), unit);
}
printf("</span>");
}
int main(int argc, char *argv[])
{
int c, unit = 'B', t = 1;
char iface[BUFSIZ] = {0};
int warningrx = 0, warningtx = 0, criticalrx = 0, criticaltx = 0;
char *envvar = NULL;
char *label = "";
envvar = getenv("USE_BITS");
if (envvar && *envvar == '1')
unit = 'b';
envvar = getenv("USE_BYTES");
if (envvar && *envvar == '1')
unit = 'B';
envvar = getenv("REFRESH_TIME");
if (envvar)
t = atoi(envvar);
envvar = getenv("INTERFACE");
if (envvar)
snprintf(iface, BUFSIZ, "%s:", envvar);
envvar = getenv("WARN_RX");
if (envvar)
warningrx = atoi(envvar);
envvar = getenv("WARN_TX");
if (envvar)
warningtx = atoi(envvar);
envvar = getenv("CRIT_RX");
if (envvar)
criticalrx = atoi(envvar);
envvar = getenv("CRIT_TX");
if (envvar)
criticaltx = atoi(envvar);
envvar = getenv("LABEL");
if (envvar)
label = envvar;
while (c = getopt(argc, argv, "bBht:i:w:c:"), c != -1) {
switch (c) {
case 'b':
case 'B':
unit = c;
break;
case 't':
t = atoi(optarg);
break;
case 'i':
snprintf(iface, BUFSIZ, "%s:", optarg);
break;
case 'w':
sscanf(optarg, "%d:%d", &warningrx, &warningtx);
break;
case 'c':
sscanf(optarg, "%d:%d", &criticalrx, &criticaltx);
break;
case 'h':
usage(argv);
return STATE_UNKNOWN;
}
}
time_t s, s_old;
ulli received, sent, received_old, sent_old;
double rx, tx;
get_values(iface, &s_old, &received_old, &sent_old);
while (1) {
sleep(t);
get_values(iface[0] ? iface : NULL, &s, &received, &sent);
rx = (received - received_old) / (float)(s - s_old);
tx = (sent - sent_old) / (float)(s - s_old);
printf("%s", label);
display(unit, rx, warningrx, criticalrx);
printf(" ");
display(unit, tx, warningtx, criticaltx);
printf("\n");
fflush(stdout);
s_old = s;
received_old = received;
sent_old = sent;
}
return STATE_OK;
}