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/*
* ZMap Copyright 2013 Regents of the University of Michigan
*
* XMap Copyright 2021 Xiang Li from Network and Information Security Lab
* Tsinghua University
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*/
#ifndef XMAP_SEND_LINUX_H
#define XMAP_SEND_LINUX_H
#include <netpacket/packet.h>
#include <sys/ioctl.h>
#include "../lib/includes.h"
#include "../lib/util.h"
#ifdef XMAP_SEND_BSD_H
#error "Don't include both send-bsd.h and send-linux.h"
#endif
// Dummy sockaddr for sendto in link level
static struct sockaddr_ll sockaddr;
int send_run_init(sock_t s) {
// Get the actual socket
int sock = s.sock;
// get source interface index
struct ifreq if_idx;
memset(&if_idx, 0, sizeof(struct ifreq));
if (strlen(xconf.iface) >= IFNAMSIZ) {
log_error("send", "device interface name (%s) too long\n", xconf.iface);
return EXIT_FAILURE;
}
strncpy(if_idx.ifr_name, xconf.iface, IFNAMSIZ - 1);
if (ioctl(sock, SIOCGIFINDEX, &if_idx) < 0) {
perror("SIOCGIFINDEX");
return EXIT_FAILURE;
}
int ifindex = if_idx.ifr_ifindex;
// destination address for the socket
memset((void *) &sockaddr, 0, sizeof(struct sockaddr_ll));
sockaddr.sll_ifindex = ifindex;
sockaddr.sll_halen = ETH_ALEN;
if (xconf.send_ip_pkts) {
switch (xconf.ipv46_flag) {
case IPV6_FLAG:
sockaddr.sll_protocol = htons(ETHERTYPE_IPV6);
break;
case IPV4_FLAG:
sockaddr.sll_protocol = htons(ETHERTYPE_IP);
break;
default:
log_fatal("socket", "iplayer for linux not supported on IPv%d",
xconf.ipv46_flag);
}
}
memcpy(sockaddr.sll_addr, xconf.gw_mac, ETH_ALEN);
return EXIT_SUCCESS;
}
int send_packet(sock_t sock, void *buf, int len, UNUSED uint32_t idx) {
return sendto(sock.sock, buf, len, 0, (struct sockaddr *) &sockaddr,
sizeof(struct sockaddr_ll));
}
#endif // XMAP_SEND_LINUX_H
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