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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Simon Wunderlich
*
* License-Filename: LICENSES/preferred/GPL-2.0
*/
#include <netinet/ether.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <time.h>
#include <unistd.h>
#include "alfred.h"
int time_diff(struct timespec *tv1, struct timespec *tv2,
struct timespec *tvdiff) {
tvdiff->tv_sec = tv1->tv_sec - tv2->tv_sec;
if (tv1->tv_nsec < tv2->tv_nsec) {
tvdiff->tv_nsec = 1000000000 + tv1->tv_nsec - tv2->tv_nsec;
tvdiff->tv_sec -= 1;
} else {
tvdiff->tv_nsec = tv1->tv_nsec - tv2->tv_nsec;
}
return (tvdiff->tv_sec >= 0);
}
void time_random_seed(void)
{
struct timespec now;
uint8_t *c = (uint8_t *)&now;
size_t i;
unsigned int s = 0;
clock_gettime(CLOCK_REALTIME, &now);
for (i = 0; i < sizeof(now); i++) {
s *= 127u;
s += c[i];
}
srand(s);
}
uint16_t get_random_id(void)
{
return random();
}
bool is_valid_ether_addr(uint8_t addr[ETH_ALEN])
{
/* multicast address */
if (addr[0] & 0x01)
return false;
/* 00:00:00:00:00:00 */
if ((addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]) == 0)
return false;
return true;
}
bool is_iface_disabled(char *iface)
{
if (!iface)
return false;
if (strcmp(iface, "none") != 0)
return false;
return true;
}
static void ipv4_request_mac_resolve(const alfred_addr *addr)
{
const struct sockaddr *sockaddr;
struct sockaddr_in inet4;
size_t sockaddr_len;
int sock;
char t = 0;
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0)
return;
memset(&inet4, 0, sizeof(inet4));
inet4.sin_family = AF_INET;
inet4.sin_port = htons(9);
inet4.sin_addr.s_addr = addr->ipv4.s_addr;
sockaddr = (const struct sockaddr *)&inet4;
sockaddr_len = sizeof(inet4);
sendto(sock, &t, sizeof(t), 0, sockaddr, sockaddr_len);
close(sock);
}
int ipv4_arp_request(struct interface *interface, const alfred_addr *addr,
struct ether_addr *mac)
{
struct arpreq arpreq;
struct sockaddr_in *sin;
int retries = 1;
memset(&arpreq, 0, sizeof(arpreq));
memset(mac, 0, ETH_ALEN);
sin = (struct sockaddr_in *)&arpreq.arp_pa;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = addr->ipv4.s_addr;
strncpy(arpreq.arp_dev, interface->interface, sizeof(arpreq.arp_dev));
arpreq.arp_dev[sizeof(arpreq.arp_dev) - 1] = '\0';
while ((ioctl(interface->netsock, SIOCGARP, &arpreq) < 0) || !(arpreq.arp_flags & ATF_COM)) {
ipv4_request_mac_resolve(addr);
usleep(200000);
if (retries-- == 0)
break;
}
if (arpreq.arp_flags & ATF_COM) {
memcpy(mac, arpreq.arp_ha.sa_data, sizeof(*mac));
} else {
perror("arp: incomplete");
return -1;
}
return 0;
}
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