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/* An adaptation of Eric Dumazet's udpflood tool. */
#include <stdio.h>
#include <stddef.h>
#include <malloc.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define _GNU_SOURCE
#include <getopt.h>
static int debug = 0;
typedef union sa_u {
struct sockaddr_in a4;
struct sockaddr_in6 a6;
} sa_u;
static int usage(void)
{
printf("usage: udpflood [ -l count ] [ -m message_size ] [ -c num_ip_addrs ] IP_ADDRESS\n");
return -1;
}
static uint32_t get_last32h(const sa_u *sa)
{
if (sa->a4.sin_family == PF_INET)
return ntohl(sa->a4.sin_addr.s_addr);
else
return ntohl(sa->a6.sin6_addr.s6_addr32[3]);
}
static void set_last32h(sa_u *sa, uint32_t last32h)
{
if (sa->a4.sin_family == PF_INET)
sa->a4.sin_addr.s_addr = htonl(last32h);
else
sa->a6.sin6_addr.s6_addr32[3] = htonl(last32h);
}
static void print_sa(const sa_u *sa, const char *msg)
{
char buf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx")];
if (!debug)
return;
switch (sa->a4.sin_family) {
case PF_INET:
inet_ntop(PF_INET, &(sa->a4.sin_addr.s_addr), buf,
sizeof(buf));
break;
case PF_INET6:
inet_ntop(PF_INET6, sa->a6.sin6_addr.s6_addr, buf, sizeof(buf));
break;
}
printf("%s: %s\n", msg, buf);
}
static long get_diff_ms(const struct timeval *now,
const struct timeval *start)
{
long start_ms, now_ms;
start_ms = start->tv_sec * 1000 + (start->tv_usec / 1000);
now_ms = now->tv_sec * 1000 + (now->tv_usec / 1000);
return now_ms - start_ms;
}
static int send_packets(const sa_u *start_sa, size_t num_addrs, int count,
int msg_sz)
{
char *msg = malloc(msg_sz);
sa_u cur_sa;
uint32_t start_addr32h, end_addr32h, cur_addr32h;
int fd, i, err;
struct timeval last, now;
if (!msg)
return -ENOMEM;
memset(msg, 0, msg_sz);
memcpy(&cur_sa, start_sa, sizeof(cur_sa));
cur_addr32h = start_addr32h = get_last32h(&cur_sa);
end_addr32h = start_addr32h + num_addrs;
fd = socket(cur_sa.a4.sin_family, SOCK_DGRAM, IPPROTO_IP);
if (fd < 0) {
perror("socket");
err = fd;
goto out_nofd;
}
err = connect(fd, (struct sockaddr *) &cur_sa, sizeof(cur_sa));
if (err < 0) {
perror("connect");
goto out;
}
print_sa(start_sa, "start_addr");
gettimeofday(&last, NULL);
for (i = 0; i < count; i++) {
print_sa(&cur_sa, "sendto");
err = sendto(fd, msg, msg_sz, 0,
(struct sockaddr *) &cur_sa, sizeof(cur_sa));
if (err < 0) {
perror("sendto");
goto out;
}
if (++cur_addr32h >= end_addr32h)
cur_addr32h = start_addr32h;
set_last32h(&cur_sa, cur_addr32h);
/*
* print timing info for every 65536 fib inserts to
* observe the gc effect (mostly for IPv6 fib).
*/
if (i && (i & 0xFFFF) == 0) {
long diff_ms;
gettimeofday(&now, NULL);
diff_ms = get_diff_ms(&now, &last);
printf("%d %ld.%ld\n", i >> 16,
diff_ms / 1000, diff_ms % 1000);
memcpy(&last, &now, sizeof(last));
}
}
err = 0;
out:
close(fd);
out_nofd:
free(msg);
return err;
}
int main(int argc, char **argv, char **envp)
{
int port, msg_sz, count, num_addrs, ret;
sa_u start_sa;
port = 6000;
msg_sz = 32;
count = 10000000;
num_addrs = 1;
while ((ret = getopt(argc, argv, "dl:s:p:c:")) >= 0) {
switch (ret) {
case 'l':
sscanf(optarg, "%d", &count);
break;
case 's':
sscanf(optarg, "%d", &msg_sz);
break;
case 'p':
sscanf(optarg, "%d", &port);
break;
case 'c':
sscanf(optarg, "%d", &num_addrs);
break;
case 'd':
debug = 1;
break;
case '?':
return usage();
}
}
if (num_addrs < 1 || count < 1)
return usage();
if (!argv[optind])
return usage();
memset(&start_sa, 0, sizeof(start_sa));
start_sa.a4.sin_port = htons(port);
if (inet_pton(PF_INET, argv[optind], &start_sa.a4.sin_addr))
start_sa.a4.sin_family = PF_INET;
else if (inet_pton(PF_INET6, argv[optind],
start_sa.a6.sin6_addr.s6_addr))
start_sa.a6.sin6_family = PF_INET6;
else
return usage();
return send_packets(&start_sa, num_addrs, count, msg_sz);
}
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