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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#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);
}
