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hping2

    1: /* 
    2:  * $smu-mark$ 
    3:  * $name: sendip_handler.c$ 
    4:  * $author: Salvatore Sanfilippo <antirez@invece.org>$ 
    5:  * $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$ 
    6:  * $license: This software is under GPL version 2 of license$ 
    7:  * $date: Fri Nov  5 11:55:49 MET 1999$ 
    8:  * $rev: 3$ 
    9:  */ 
   10: 
   11: #include <stdio.h>
   12: 
   13: #include "hping2.h"
   14: #include "globals.h"
   15: 
   16: void send_ip_handler(char *packet, unsigned int size)
   17: {
   18: 	ip_optlen = ip_opt_build(ip_opt);
   19: 
   20: 	if (!opt_fragment && (size+ip_optlen+20 >= h_if_mtu))
   21: 	{
   22: 		/* auto-activate fragmentation */
   23: 		virtual_mtu = h_if_mtu-20;
   24: 		virtual_mtu = virtual_mtu - (virtual_mtu % 8);
   25: 		opt_fragment = TRUE;
   26: 		opt_mf = opt_df = FALSE; /* deactivate incompatible options */
   27: 		if (opt_verbose || opt_debug)
   28: 			printf("auto-activate fragmentation, fragments size: %d\n", virtual_mtu);
   29: 	}
   30: 
   31: 	if (!opt_fragment)
   32: 	{
   33: 		unsigned short fragment_flag = 0;
   34: 
   35: 		if (opt_mf) fragment_flag |= MF; /* more fragments */
   36: 		if (opt_df) fragment_flag |= DF; /* dont fragment */
   37: 		send_ip((char*)&local.sin_addr,
   38: 			(char*)&remote.sin_addr,
   39: 			packet, size, fragment_flag, ip_frag_offset,
   40: 			ip_opt, ip_optlen);
   41: 	}
   42: 	else
   43: 	{
   44: 		unsigned int remainder = size;
   45: 		int frag_offset = 0;
   46: 
   47: 		while(1) {
   48: 			if (remainder <= virtual_mtu)
   49: 				break;
   50: 
   51: 			send_ip((char*)&local.sin_addr,
   52: 				(char*)&remote.sin_addr,
   53: 				packet+frag_offset,
   54: 				virtual_mtu, MF, frag_offset,
   55: 				ip_opt, ip_optlen);
   56: 
   57: 			remainder-=virtual_mtu;
   58: 			frag_offset+=virtual_mtu;
   59: 		}
   60: 
   61: 		send_ip((char*)&local.sin_addr,
   62: 			(char*)&remote.sin_addr,
   63: 			packet+frag_offset,
   64: 			remainder, NF, frag_offset,
   65: 			ip_opt, ip_optlen);
   66: 	}
   67: }