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https://code.semirocket.science/wrapsix
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Ethernet stuff moved to separated header file
Reworked IP addresses translation functions Centralized initializing of random number generator
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34
src/ethernet.h
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34
src/ethernet.h
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@ -0,0 +1,34 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2011 Michal Zima <xhire@mujmalysvet.cz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ETHERNET_H
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#define ETHERNET_H
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/* MAC address structure */
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struct s_mac_addr {
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unsigned char addr[6];
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} __attribute__ ((__packed__));
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/* Ethernet header structure */
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struct s_ethernet {
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struct s_mac_addr dest; /* 48 b; destination host (MAC) address */
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struct s_mac_addr src; /* 48 b; source host (MAC) address */
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unsigned short type; /* 16 b; IP/ARP/RARP/... */
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} __attribute__ ((__packed__));
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#endif /* ETHERNET_H */
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@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2010 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2011 Michal Zima <xhire@mujmalysvet.cz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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@ -19,6 +19,8 @@
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#ifndef IPV6_H
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#define IPV6_H
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#include "ethernet.h" /* s_ethernet */
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/* IPv6 address structure */
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struct s_ipv6_addr {
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unsigned char addr[16];
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@ -36,6 +38,6 @@ struct s_ipv6 {
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struct s_ipv6_addr ip_dest; /* 128 b; destination address */
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} __attribute__ ((__packed__));
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int ipv6(struct s_ethernet *eth, char *payload);
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int ipv6(struct s_ethernet *eth, char *packet);
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#endif /* IPV6_H */
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@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2010 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2011 Michal Zima <xhire@mujmalysvet.cz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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@ -89,7 +89,6 @@ struct s_nat *nat_out(radixtree_t *nat_proto6, radixtree_t *nat_proto4,
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result->last_packet = time(NULL);
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/* generate some outgoing port */
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srand((unsigned int) time(NULL));
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do {
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/* return port from range 1024 - 65535 */
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connection->ipv4_port_src = (rand() % 64511) + 1024;
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@ -1,6 +1,6 @@
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/*
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* WrapSix
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* Copyright (C) 2008-2010 Michal Zima <xhire@mujmalysvet.cz>
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* Copyright (C) 2008-2011 Michal Zima <xhire@mujmalysvet.cz>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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@ -23,10 +23,13 @@
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#include <netinet/in.h> /* htons */
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#include <net/ethernet.h> /* ETHERTYPE_* */
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#include <stdio.h>
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#include <stdlib.h> /* srand */
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#include <string.h> /* strncpy */
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#include <sys/ioctl.h> /* ioctl, SIOCGIFINDEX */
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#include <time.h> /* time */
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#include <unistd.h> /* close */
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#include "ethernet.h"
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#include "ipv4.h"
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#include "ipv6.h"
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#include "nat.h"
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@ -85,6 +88,9 @@ int main(int argc, char **argv)
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/* initiate NAT tables */
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nat_init();
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/* initiate random numbers generator */
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srand((unsigned int) time(NULL));
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/* sniff! :c) */
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for (;;) {
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addr_size = sizeof(addr);
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@ -138,21 +144,13 @@ int process(char *packet)
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}
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}
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struct s_ipv4_addr ipv6_to_ipv4(struct s_ipv6_addr *ipv6_addr)
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void ipv6_to_ipv4(struct s_ipv6_addr *ipv6_addr, struct s_ipv4_addr *ipv4_addr)
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{
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struct s_ipv4_addr ipv4_addr;
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memcpy(&ipv4_addr, &ipv6_addr + 12, 4);
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return ipv4_addr;
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memcpy(ipv4_addr, &ipv6_addr + 12, 4);
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}
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struct s_ipv6_addr ipv4_to_ipv6(struct s_ipv4_addr *ipv4_addr)
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void ipv4_to_ipv6(struct s_ipv4_addr *ipv4_addr, struct s_ipv6_addr *ipv6_addr)
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{
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struct s_ipv6_addr ipv6_addr;
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ipv6_addr = wrapsix_ipv6_prefix;
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memcpy(&ipv6_addr + 12, &ipv4_addr, 4);
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return ipv6_addr;
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*ipv6_addr = wrapsix_ipv6_prefix;
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memcpy(ipv6_addr + 12, &ipv4_addr, 4);
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}
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@ -19,27 +19,13 @@
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#ifndef WRAPPER_H
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#define WRAPPER_H
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/* MAC address structure */
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struct s_mac_addr {
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unsigned char a;
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unsigned char b;
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unsigned char c;
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unsigned char d;
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unsigned char e;
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unsigned char f;
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} __attribute__ ((__packed__));
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/* Ethernet header structure */
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struct s_ethernet {
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struct s_mac_addr dest; /* 48 b; destination host (MAC) address */
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struct s_mac_addr src; /* 48 b; source host (MAC) address */
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unsigned short type; /* 16 b; IP/ARP/RARP/... */
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} __attribute__ ((__packed__));
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#include "ipv4.h"
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#include "ipv6.h"
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extern struct s_ipv6_addr ndp_multicast_addr;
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extern struct s_ipv6_addr wrapsix_ipv6_prefix;
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struct s_ipv4_addr ipv6_to_ipv4(struct s_ipv6_addr *ipv6_addr);
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struct s_ipv6_addr ipv4_to_ipv6(struct s_ipv4_addr *ipv4_addr);
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void ipv6_to_ipv4(struct s_ipv6_addr *ipv6_addr, struct s_ipv4_addr *ipv4_addr);
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void ipv4_to_ipv6(struct s_ipv4_addr *ipv4_addr, struct s_ipv6_addr *ipv6_addr);
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#endif /* WRAPPER_H */
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