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Date:      Thu, 25 Jan 2001 00:24:04 -0800 (PST)
From:      John <youzkz@yahoo.com>
To:        freebsd-net@FreeBSD.ORG
Subject:   problems compiling raw socket program
Message-ID:  <20010125082404.9311.qmail@web3004.mail.yahoo.com>
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--0-197227092-980411044=:7396
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Hi

Can anyone enlighten me on why I can't compile?

I use gcc -o rawsocket rawsocket.c

and I get:

bash-2.03$ gcc -o rawsocket  rawsocket.c
In file included from rawsocket.c:7:
/usr/include/netinet/ip.h:152: parse error before
`n_long'
/usr/include/netinet/ip.h:152: warning: no semicolon
at end of struct or union
/usr/include/netinet/ip.h:152: warning: no semicolon
at end of struct or union
/usr/include/netinet/ip.h:155: parse error before
`n_long'
/usr/include/netinet/ip.h:155: warning: no semicolon
at end of struct or union
/usr/include/netinet/ip.h:156: warning: data
definition has no type or storage class
/usr/include/netinet/ip.h:157: parse error before `}'
/usr/include/netinet/ip.h:157: warning: data
definition has no type or storage class
/usr/include/netinet/ip.h:158: parse error before `}'
bash-2.03$ 


thanks

john

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--0-197227092-980411044=:7396
Content-Type: text/plain; name="rawsocket.c"
Content-Description: rawsocket.c
Content-Disposition: inline; filename="rawsocket.c"

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <netdb.h>
#include <stdio.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdlib.h>


#define PORTNUMBER 80

int main(void)
{
	int n, s;
	char buf[4096];
	char hostname[64];
	//struct hostent *hp;
	struct sockaddr_in name;
	struct ip *iph = (struct ip *) buf;
	struct tcphdr *tcph = (struct tcphdr *) buf + sizeof (struct ip);
	
	memset (buf, 0, 4096);	/* zero out the buffer */
	
	/* we'll now fill in the ip/tcp header values, see above for explanations */
  	iph->ip_hl = 5;
  	iph->ip_v = 4;
  	iph->ip_tos = 0;
  	iph->ip_len = sizeof (struct ip) + sizeof (struct tcphdr);	/* no payload */
  	iph->ip_id = htonl (54321);	/* the value doesn't matter here */
  	iph->ip_off = 0;
  	iph->ip_ttl = 255;
  	iph->ip_p = 6;
  	iph->ip_sum = 0;		/* set it to 0 before computing the actual checksum later */
  	iph->ip_src.s_addr = inet_addr ("1.2.3.4");/* SYN's can be blindly spoofed */
  	iph->ip_dst.s_addr = name.sin_addr.s_addr;
  	tcph->th_sport = htons (1234);	/* arbitrary port */
  	tcph->th_dport = htons (PORTNUMBER);
  	tcph->th_seq = random ();/* in a SYN packet, the sequence is a random */
  	tcph->th_ack = 0;/* number, and the ack sequence is 0 in the 1st packet */
  	tcph->th_x2 = 0;
  	tcph->th_off = 0;		/* first and only tcp segment */
  	tcph->th_flags = TH_SYN;	/* initial connection request */
  	tcph->th_win = htonl (65535);	/* maximum allowed window size */
  	tcph->th_sum = 0;/* if you set a checksum to zero, your kernel's IP stack
		      should fill in the correct checksum during transmission */
  	tcph->th_urp = 0;

  	iph->ip_sum = csum ((unsigned short *) buf, iph->ip_len >> 1);

	if ((s = socket(AF_INET, SOCK_RAW, IPPROTO_UDP)) < 0) {
		perror("socket");
		exit(1);
	}

/* finally, it is very advisable to do a IP_HDRINCL call, to make sure
   that the kernel knows the header is included in the data, and doesn't
   insert its own header into the packet before our data */

  {				/* lets do it the ugly way.. */
    int one = 1;
    const int *val = &one;
    if (setsockopt (s, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0)
      printf ("Warning: Cannot set HDRINCL!\n");
  }
	
	//create the address of the server, also local
	memset(&name, 0, sizeof(struct sockaddr_in));
	
	name.sin_family = AF_INET;
	name.sin_port = htons(PORTNUMBER);
	name.sin_addr.s_addr = inet_addr ("127.0.0.1");
	
      if (sendto (s,		/* our socket */
		  buf,	/* the buffer containing headers and data */
		  iph->ip_len,	/* total length of our datagram */
		  0,		/* routing flags, normally always 0 */
		  (struct sockaddr *) &name,	/* socket addr, just like in */
		  sizeof (name)) < 0)		/* a normal send() */
	printf ("error\n");
      else
	printf (".");
	
	close(s);
	exit(0);
}
	
--0-197227092-980411044=:7396--


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