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#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <linux/limits.h>
#include <time.h>
#include <stdio.h>
#include <string.h>
static unsigned long long interface_tx_bytes(const char *interface)
{
char buf[PATH_MAX];
FILE *f;
unsigned long long ret;
snprintf(buf, PATH_MAX - 1, "/sys/class/net/%s/statistics/tx_bytes", interface);
f = fopen(buf, "r");
fscanf(f, "%llu", &ret);
fclose(f);
return ret;
}
int main(int argc, char *argv[])
{
char buf[1500] = { 0 };
unsigned long long before, after, i;
struct timespec begin, end;
double elapsed;
struct ifreq req;
int fd = socket(AF_INET, SOCK_DGRAM, 0);
struct sockaddr_in addr = {
.sin_family = AF_INET,
.sin_port = htons(7271),
.sin_addr = inet_addr(argv[3])
};
strcpy(req.ifr_name, argv[1]);
ioctl(fd, SIOCGIFMTU, &req);
connect(fd, (struct sockaddr *)&addr, sizeof(addr));
before = interface_tx_bytes(argv[2]);
clock_gettime(CLOCK_MONOTONIC, &begin);
for (i = 0; i < 10000000; ++i)
send(fd, buf, req.ifr_mtu - 28, 0);
clock_gettime(CLOCK_MONOTONIC, &end);
after = interface_tx_bytes(argv[2]);
elapsed = end.tv_sec - begin.tv_sec + (end.tv_nsec - begin.tv_nsec) / 1000000000.0;
printf("%.4f mbps\n", ((after - before) * 8) / elapsed / 1000000.0);
return 0;
}
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