Add support for Debian Packaging and systemd

1 files changed, 0 insertions, 410 deletions

diff --git a/main.c b/main.c
deleted file mode 100644
index f3df27b..0000000
--- a/main.c
+++ /dev/null
@@ -1,410 +0,0 @@
-/*
-******************************************************************
-udp-broadcast-relay
-	Relays UDP broadcasts to other networks, forging
-	the sender address.
-
-Copyright (c) 2003 Joachim Breitner <mail@joachim-breitner.de>
-
-Based upon:
-udp_broadcast_fw ; Forwards UDP broadcast packets to all local 
-	interfaces as though they originated from sender
-	
-Copyright (C) 2002  Nathan O'Sullivan
-
-This program is free software; you can redistribute it and/or
-modify it under the terms of the GNU General Public License
-as published by the Free Software Foundation; either version 2
-of the License, or (at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-******************************************************************
-
-Thanks:
-
-Arny <cs6171@scitsc.wlv.ac.uk> 
-- public domain UDP spoofing code
-http://www.netfor2.com/ip.htm
-- IP/UDP packet formatting info
-
-*/
-
-#define MAXIFS	256
-#define DPRINT  if (debug) printf
-#define IPHEADER_LEN 20
-#define UDPHEADER_LEN 8
-#define HEADER_LEN (IPHEADER_LEN + UDPHEADER_LEN)
-#define TTL_ID_OFFSET 64
- 
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in_systm.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-#include <errno.h>
-#include <string.h>
-#include <arpa/inet.h>
-#include <stdio.h>
-#include <linux/if.h>
-#include <sys/ioctl.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-/* list of addresses and interface numbers on local machine */
-static struct {
-	struct sockaddr_in dstaddr;
-	int ifindex, raw_socket;
-} ifs[MAXIFS];
-
-/* Where we forge our packets */
-static u_char gram[4096]=
-{
-	0x45,	0x00,	0x00,	0x26,
-	0x12,	0x34,	0x00,	0x00,
-	0xFF,	0x11,	0,	0,
-	0,	0,	0,	0,
-	0,	0,	0,	0,
-	0,	0,	0,	0,
-	0x00,	0x12,	0x00,	0x00,
-	'1','2','3','4','5','6','7','8','9','0'
-};
-
-int main(int argc,char **argv)
-{
-	/* Debugging, forking, other settings */
-	int debug, forking;
-	
-	u_int16_t port;
-	u_char id;
-	u_char ttl;
-
-	/* We use two sockets - one for receiving broadcast packets (type UDP), and
-	   one for spoofing them (type RAW) */
-	int fd,rcv;
-
-	/* Structure holds info on local interfaces */
-	struct ifreq reqbuf;
-	int maxifs;
-		
-	/* Address broadcast packet was sent from */
-	struct sockaddr_in rcv_addr;
-
-        /* Spoofing source address of outgoing packets */
-        in_addr_t spoof_addr = 0;
-	
-	/* Incoming message read via rcvsmsg */
-	struct msghdr rcv_msg;
-	struct iovec iov;
-	u_char pkt_infos[16384];
-
-	/* various variables */
-	int x=1, len;
-	
-	struct cmsghdr *cmsg;
-	int *ttlptr=NULL;
-	int rcv_ifindex = 0;
-
-	iov.iov_base = gram+ HEADER_LEN; 
-	iov.iov_len = 4006 - HEADER_LEN - 1;
-	
-	rcv_msg.msg_name = &rcv_addr;
-	rcv_msg.msg_namelen = sizeof(rcv_addr);
-	rcv_msg.msg_iov = &iov;
-	rcv_msg.msg_iovlen = 1;
-	rcv_msg.msg_control = pkt_infos;
-	rcv_msg.msg_controllen = sizeof(pkt_infos);
-	
-	/* parsing the args */
-	if(argc < 5)
-	{
-		fprintf(stderr,"usage: %s [-d] [-f] [-s IP] id udp-port dev1 dev2 ...\n\n",*argv);
-		fprintf(stderr,"This program listens for broadcast  packets  on the  specified UDP port\n"
-			"and then forwards them to each other given interface.  Packets are sent\n"
-			"such that they appear to have come from the original broadcaster, resp.\n"
-			"from the spoofing IP in case -s is used.  When using multiple instances\n"
-			"for the same port on the same network, they must have a different id.\n\n"
-			"    -d      enables debugging\n"
-			"    -f      forces forking to background\n"
-			"    -s IP   sets the source IP of forwarded packets; otherwise the\n"
-			"            original sender's address is used\n\n");
-		exit(1);
-	};
-	
-	if ((debug = (strcmp(argv[1],"-d") == 0)))
-	{
-		argc--;
-		argv++;
-		DPRINT ("Debugging Mode enabled\n");
-	};
-	
-	if ((forking = (strcmp(argv[1],"-f") == 0)))
-	{
-		argc--;
-		argv++;
-		DPRINT ("Forking Mode enabled (while debuggin? useless..)\n");
-	};
-
-	if (strcmp(argv[1],"-s") == 0)
-	{
-		/* INADDR_NONE is a valid IP address (-1 = 255.255.255.255),
-		 * so inet_pton() would be a better choice. But in this case it
-		 * does not matter. */
-		spoof_addr = inet_addr(argv[2]);
-		if (spoof_addr == INADDR_NONE) {
-			fprintf (stderr,"invalid IP address: %s\n", argv[2]);
-			exit(1);
-		}
-		DPRINT ("Outgoing source IP set to %s\n", argv[2]);
-		argc-=2;
-		argv+=2;
-	};
-
-	if ((id = atoi(argv[1])) == 0)
-	{
-		fprintf (stderr,"ID argument not valid\n");
-		exit(1);
-	}
-	argc--;
-	argv++;
-
-	if (id < 1 || id > 99)
-	{
-		fprintf (stderr,"ID argument %i not between 1 and 99\n",id);
-		exit(1);
-	}
-	ttl = id+TTL_ID_OFFSET;
-	gram[8] = ttl;
-	/* The id is used to detect packets we just sent, and is stored in the "ttl" field,
-	 * which is not used with broadcast packets. Beware when using this with
-	 * non-broadcast-packets */
-	
-	if ((port = atoi(argv[1])) == 0)
-	{
-		fprintf (stderr,"Port argument not valid\n");
-		exit(1);
-	}
-	argc--;
-	argv++;
-	
-	DPRINT ("ID: %i (ttl: %i), Port %i\n",id,ttl,port);
-
-
-	/* We need to find out what IP's are bound to this host - set up a temporary socket to do so */
- 	if((fd=socket(AF_INET,SOCK_RAW,IPPROTO_RAW)) < 0)
-	{
-  		perror("socket");
-		fprintf(stderr,"You must be root to create a raw socket\n");
-  		exit(1);
-  	};
-
-	/* For each interface on the command line */
-	for (maxifs=0;argc>1;argc--,argv++)
-	{
-		int ioctl_request; 
-
-		strncpy(reqbuf.ifr_name,argv[1],IFNAMSIZ);
-
-		/* Request index for this interface */
-		if (ioctl(fd,SIOCGIFINDEX, &reqbuf) < 0) {
-			perror("ioctl(SIOCGIFINDEX)");
-			exit(1);
-		}
-		
-		/* Save the index for later use */	
-		ifs[maxifs].ifindex = reqbuf.ifr_ifindex;
-		
-		/* Request flags for this interface */
-		if (ioctl(fd,SIOCGIFFLAGS, &reqbuf) < 0) {
-			perror("ioctl(SIOCGIFFLAGS)");
-			exit(1);
-		}
-
-		/* if the interface is not up or a loopback, ignore it */
-		if ((reqbuf.ifr_flags & IFF_UP) == 0 ||
-      		    (reqbuf.ifr_flags & IFF_LOOPBACK) )
-			continue;
-
-		/* find the address type we need */
-		if (reqbuf.ifr_flags & IFF_BROADCAST)
-			ioctl_request = SIOCGIFBRDADDR;
-		else 
-			ioctl_request = SIOCGIFDSTADDR;
-				
-
-		/* Request the broadcast/destination address for this interface */
-  		if (ioctl(fd,ioctl_request, &reqbuf) < 0) {
-      			perror("ioctl(SIOCGIFBRDADDR)");
-      			exit(1);
-    		}
-
-		/* Save the address for later use */
-		bcopy(	(struct sockaddr_in *)&reqbuf.ifr_addr,
-			&ifs[maxifs].dstaddr,
-			sizeof(struct sockaddr_in) );
-
-		DPRINT("%s: %i / %s\n",
-			reqbuf.ifr_name,
-			ifs[maxifs].ifindex,
-			inet_ntoa(ifs[maxifs].dstaddr.sin_addr) );
-
-		/* Set up a one raw socket per interface for sending our packets through */
-		if((ifs[maxifs].raw_socket = socket(AF_INET,SOCK_RAW,IPPROTO_RAW)) < 0)
-		{
-			perror("socket");
-			exit(1);
-		};
-		x=1;
-		if (setsockopt(ifs[maxifs].raw_socket,SOL_SOCKET,SO_BROADCAST,(char*)&x,sizeof(x))<0)
-		{
-			perror("setsockopt SO_BROADCAST");
-			exit(1);
-		};
-		/* bind socket to dedicated NIC (override routing table) */
-		if (setsockopt(ifs[maxifs].raw_socket,SOL_SOCKET,SO_BINDTODEVICE,argv[1],strlen(argv[1])+1)<0)
-		{
-			perror("setsockopt IP_HDRINCL");
-			exit(1);
-		};
-		/* Enable IP header stuff on the raw socket */
-		#ifdef IP_HDRINCL
-		x=1;
-		if (setsockopt(ifs[maxifs].raw_socket,IPPROTO_IP,IP_HDRINCL,(char*)&x,sizeof(x))<0)
-		{
-			perror("setsockopt IP_HDRINCL");
-			exit(1);
-		};
-		#else
-		#error IP_HDRINCL support is required
-		#endif
-
-		/* ... and count it */
-		maxifs++;
-	}
-	/* well, we want the max index, actually */
-	maxifs--;
-	DPRINT("found %i interfaces total\n",maxifs+1);
-	
-	/* Free our allocated buffer and close the socket */
-	close(fd);
-
-	/* Create our broadcast receiving socket */
-	if((rcv=socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)) < 0)
-  	{
-  		perror("socket");
-  		exit(1);
-  	};
-
-	x = 1;
-	if(setsockopt(rcv, SOL_SOCKET, SO_BROADCAST, (char*) &x, sizeof(int))<0){
-		perror("SO_BROADCAST on rcv");
-		exit(1);
-	};
-	if(setsockopt(rcv, SOL_IP, IP_RECVTTL, (char*) &x, sizeof(int))<0){
-		perror("IP_RECVTTL on rcv");
-		exit(1);
-	};
-	if(setsockopt(rcv, SOL_IP, IP_PKTINFO, (char*) &x, sizeof(int))<0){
-		perror("IP_PKTINFO on rcv");
-		exit(1);
-	};
-
-	/* We bind it to broadcast addr on the given port */
-	rcv_addr.sin_family = AF_INET;
-	rcv_addr.sin_port = htons(port);
-	rcv_addr.sin_addr.s_addr = INADDR_ANY;
-
-	if ( bind (rcv, (struct sockaddr *)&rcv_addr, sizeof(struct sockaddr_in) ) < 0 )
-	{
-		perror("bind");
-		fprintf(stderr,"A program is already bound to the broadcast address for the given port\n");
-		exit(1);
-	}
-
-	/* Set dest port to that was provided on command line */
-	*(u_short*)(gram+22)=(u_short)htons(port);
-
- 	/* Fork to background */
-  if (! debug) {
-    if (forking && fork())
-      exit(0);
-
-    fclose(stdin);
-    fclose(stdout);
-    fclose(stderr);
-  }
-
-  DPRINT("Done Initializing\n\n");
-
-	for (;;) /* endless loop */
-	{
-		/* Receive a broadcast packet */
-		len = recvmsg(rcv,&rcv_msg,0);
-		if (len <= 0) continue;	/* ignore broken packets */
-
-		/* Find the ttl and the receiving interface */
-		ttlptr=NULL;
-		if (rcv_msg.msg_controllen>0)
-		  for (cmsg=CMSG_FIRSTHDR(&rcv_msg);cmsg;cmsg=CMSG_NXTHDR(&rcv_msg,cmsg)) {
-		    if (cmsg->cmsg_type==IP_TTL) {
-		      ttlptr = (int *)CMSG_DATA(cmsg);
-		    }
-		    if (cmsg->cmsg_type==IP_PKTINFO) {
-		      rcv_ifindex=((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_ifindex;
-		    }
-		  }
-
-		if (ttlptr == NULL) {
-			perror("TTL not found on incoming packet\n");
-			exit(1);
-		}
-		if (*ttlptr == ttl) {
-			DPRINT ("Got local package (TTL %i) on interface %i\n",*ttlptr,rcv_ifindex);
-			continue;
-		}
-		
-
-		gram[HEADER_LEN + len] =0;
-		DPRINT("Got remote package:\n");
-		// DPRINT("Content:\t%s\n",gram+HEADER_LEN);
-		DPRINT("TTL:\t\t%i\n",*ttlptr);
-		DPRINT("Interface:\t%i\n",rcv_ifindex);
-		DPRINT("From:\t\t%s:%d\n",inet_ntoa(rcv_addr.sin_addr),rcv_addr.sin_port);
-	
-		/* copy sender's details into our datagram as the source addr */	
-		if (spoof_addr)
-			rcv_addr.sin_addr.s_addr = spoof_addr;
-		bcopy(&(rcv_addr.sin_addr.s_addr),(gram+12),4);
-	  	*(u_short*)(gram+20)=(u_short)rcv_addr.sin_port;
-
-		/* set the length of the packet */
-		*(u_short*)(gram+24)=htons(8 + len);
-		*(u_short*)(gram+2)=htons(28+len);
-
-		/* Iterate through our interfaces and send packet to each one */
-		for (x=0;x<=maxifs;x++)
-		{
-			if (ifs[x].ifindex == rcv_ifindex) continue; /* no bounces, please */
-
-			/* Set destination addr ip - port is set already */
-			bcopy(&(ifs[x].dstaddr.sin_addr.s_addr),(gram+16),4);	
-
-			DPRINT ("Sent to %s:%d on interface %i\n",
-				inet_ntoa(ifs[x].dstaddr.sin_addr), /* dst ip */
-				ntohs(*(u_short*)(gram+22)), /* dst port */
-				ifs[x].ifindex); /* interface number */
-				
-			/* Send the packet */
-			if (sendto(ifs[x].raw_socket,
-					&gram,
-					28+len,0,
-					(struct sockaddr*)&ifs[x].dstaddr,sizeof(struct sockaddr)
-				) < 0)
-				perror("sendto");
-		}
-		DPRINT ("\n");
-	}
-}