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/* Sniffit Packet Generation File */
/* - Idea/development/code:Amlan Saha */
/* - Packet code/debugging: Brecht Claerhout */
#include "sn_config.h"
#ifdef INCLUDE_INTERFACE
#ifdef GENERATION
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "sn_curses.h"
#include "sn_defines.h"
#include "sn_structs.h"
#include "sn_generation.h"
extern volatile int screen_busy;
void exec_generate(struct generate_mask *generate)
{
WINDOW *Msg_dsp;
int count=0, count_ptr, fd;
char msg[80];
char dummy_data[]="This Packet was fired with Sniffit!";
#ifdef DEBUG
debug_msg("Gener: Start of execution");
#endif
count_ptr=(generate->pkt_no);
Msg_dsp=newwin(1,COLS,LINES-1,0);
wattrset(Msg_dsp,A_BOLD);
wattrset(Msg_dsp,COLOR_PAIR(WIN_COLOR_PKTCNT));
fd=open_sending();
while(count<count_ptr)
{
/* Packet firing routine here */
#ifdef DEBUG
debug_msg("Gener: Transmitting Packet");
#endif
transmit_UDP(fd, dummy_data,0 ,strlen(dummy_data),
generate->source_ip, generate->source_port,
generate->dest_ip, generate->dest_port);
#ifdef DEBUG
debug_msg("Gener: End");
#endif
if(count==count_ptr-1)
{
sprintf(msg,"DISPATCH COMPLETE-Press ENTER");
}
else {
sprintf(msg,"Packet No: %d dispatched.",count+1);
}
mvwaddstr(Msg_dsp,0,27,msg);
while(screen_busy!=0) {};
wnoutrefresh(Msg_dsp);
doupdate();
count++;
}
delwin(Msg_dsp);
close(fd);
input_field(msg,NULL,0);
forced_refresh();
}
/**************************************************************************/
/* Actual packet generation functions below */
/* code stolen from Spoofit (my own ;) */
/* */
/* int open_sending (void) */
/* Returns a filedescriptor to the sending socket. */
/* close it with close (int filedesc) */
/* */
/* void transmit_TCP (int sp_fd, char *sp_data, */
/* int sp_ipoptlen, int sp_tcpoptlen, int sp_datalen, */
/* char *sp_source, unsigned short sp_source_port, */
/* char *sp_dest,unsigned short sp_dest_port, */
/* _32_bit sp_seq, _32_bit sp_ack, */
/* unsigned short sp_flags) */
/* fire data away in a TCP packet */
/* sp_fd : raw socket filedesc. */
/* sp_data : IP options (you should do the padding) */
/* TCP options (you should do the padding) */
/* data to be transmitted */
/* (NULL is nothing) */
/* note that all is optional, and IP en TCP options are*/
/* not often used. */
/* All data is put after eachother in one buffer. */
/* sp_ipoptlen : length of IP options (in bytes) */
/* sp_tcpoptlen : length of TCP options (in bytes) */
/* sp_datalen : amount of data to be transmitted (bytes) */
/* sp_source : spoofed host that"sends packet" */
/* sp_source_port: spoofed port that "sends packet" */
/* sp_dest : host that should receive packet */
/* sp_dest_port : port that should receive packet */
/* sp_seq : sequence number of packet */
/* sp_ack : ACK of packet */
/* sp_flags : flags of packet (URG,ACK,PSH,RST,SYN,FIN) */
/* */
/* void transmit_UDP (int sp_fd, char *sp_data, */
/* int sp_ipoptlen, int sp_datalen, */
/* char *sp_source, unsigned short sp_source_port, */
/* char *sp_dest, unsigned short sp_dest_port) */
/* fire data away in an UDP packet */
/* sp_fd : raw socket filedesc. */
/* sp_data : IP options */
/* data to be transmitted */
/* (NULL if none) */
/* sp_ipoptlen : length of IP options (in bytes) */
/* sp_datalen : amount of data to be transmitted */
/* sp_source : spoofed host that"sends packet" */
/* sp_source_port: spoofed port that "sends packet" */
/* sp_dest : host that should receive packet */
/* sp_dest_port : port that should receive packet */
/* */
/**************************************************************************/
#define SP_IP_HEAD_BASE 20 /* using fixed lengths to send */
#define SP_TCP_HEAD_BASE 20 /* no options etc... */
#define SP_UDP_HEAD_BASE 8 /* Always fixed */
int open_sending (void)
{
struct protoent *sp_proto;
int sp_fd;
int dummy=1;
/* they don't come rawer */
if ((sp_fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW))==-1)
perror("Couldn't open Socket."), exit(1);
#ifdef DEBUG
printf("Raw socket ready\n");
#endif
return sp_fd;
}
void sp_send_packet (struct sp_data_exchange *sp, unsigned char proto)
{
int sp_status;
struct sockaddr_in sp_server;
struct hostent *sp_help;
int HEAD_BASE;
/* Construction of destination */
bzero((char *)&sp_server, sizeof(struct sockaddr));
sp_server.sin_family = AF_INET;
sp_server.sin_addr.s_addr = sp->dest;
/*
if (sp_server.sin_addr.s_addr == (unsigned int)-1)
{
if (!(sp_help=gethostbyname(sp->dest)))
fprintf(stderr,"unknown host %s\n", sp->dest), exit(1);
bcopy(sp_help->h_addr, (caddr_t)&sp_server.sin_addr, sp_help->h_length);
};
*/
switch(proto)
{
case 6: HEAD_BASE = SP_TCP_HEAD_BASE; break; /* TCP */
case 17: HEAD_BASE = SP_UDP_HEAD_BASE; break; /* UDP */
default: exit(1); break;
};
sp_status = sendto(sp->fd, (char *)(sp->buffer), sp->datalen+HEAD_BASE+SP_IP_HEAD_BASE+sp->IP_optlen, 0,
(struct sockaddr *)&sp_server,sizeof(struct sockaddr));
if (sp_status < 0 || sp_status != sp->datalen+HEAD_BASE+SP_IP_HEAD_BASE+sp->IP_optlen)
{
if (sp_status < 0)
perror("Sendto"), exit(1);
printf("hmm... Only transmitted %d of %d bytes.\n", sp_status,
sp->datalen+HEAD_BASE);
};
#ifdef DEBUG
printf("Packet transmitted...\n");
#endif
}
void sp_fix_IP_packet (struct sp_data_exchange *sp, unsigned char proto)
{
struct IP_header *sp_help_ip;
int HEAD_BASE;
switch(proto)
{
case 6: HEAD_BASE = SP_TCP_HEAD_BASE; break; /* TCP */
case 17: HEAD_BASE = SP_UDP_HEAD_BASE; break; /* UDP */
default: exit(1); break;
};
sp_help_ip = (struct IP_header *) (sp->buffer);
sp_help_ip->verlen = (IP_VERSION << 4) | ((SP_IP_HEAD_BASE+sp->IP_optlen)/4);
sp_help_ip->type = 0;
sp_help_ip->length = htons(SP_IP_HEAD_BASE+HEAD_BASE+sp->datalen+sp->IP_optlen+sp->TCP_optlen);
sp_help_ip->ID = htons(12545); /* TEST */
sp_help_ip->flag_offset = 0;
sp_help_ip->TTL = 69;
sp_help_ip->protocol = proto;
sp_help_ip->source = sp->source;
sp_help_ip->destination = sp->dest;
sp_help_ip->checksum=in_cksum((unsigned short *) (sp->buffer),
SP_IP_HEAD_BASE+sp->IP_optlen);
#ifdef DEBUG
printf("IP header fixed...\n");
#endif
}
void sp_fix_TCP_packet (struct sp_data_exchange *sp)
{
char sp_pseudo_ip_construct[MTU];
struct TCP_header *sp_help_tcp;
struct pseudo_IP_header *sp_help_pseudo;
int i;
for(i=0;i<MTU;i++)
{sp_pseudo_ip_construct[i]=0;}
sp_help_tcp = (struct TCP_header *) (sp->buffer+SP_IP_HEAD_BASE+sp->IP_optlen);
sp_help_pseudo = (struct pseudo_IP_header *) sp_pseudo_ip_construct;
sp_help_tcp->offset_flag = htons( (((SP_TCP_HEAD_BASE+sp->TCP_optlen)/4)<<12) | sp->flags);
sp_help_tcp->seq_nr = htonl(sp->seq);
sp_help_tcp->ACK_nr = htonl(sp->ack);
sp_help_tcp->source = htons(sp->source_port);
sp_help_tcp->destination = htons(sp->dest_port);
sp_help_tcp->window = htons(0x7c00); /* dummy for now 'wujx' */
sp_help_pseudo->source = sp->source;
sp_help_pseudo->destination = sp->dest;
sp_help_pseudo->zero_byte = 0;
sp_help_pseudo->protocol = 6;
sp_help_pseudo->TCP_UDP_len = htons(sp->datalen+SP_TCP_HEAD_BASE+sp->TCP_optlen);
memcpy(sp_pseudo_ip_construct+12, sp_help_tcp, sp->TCP_optlen+sp->datalen+SP_TCP_HEAD_BASE);
sp_help_tcp->checksum=in_cksum((unsigned short *) sp_pseudo_ip_construct,
sp->datalen+12+SP_TCP_HEAD_BASE+sp->TCP_optlen);
#ifdef DEBUG
printf("TCP header fixed...\n");
#endif
}
void transmit_TCP (int sp_fd, char *sp_data,
int sp_ipoptlen, int sp_tcpoptlen, int sp_datalen,
_32_bit sp_source, unsigned short sp_source_port,
_32_bit sp_dest, unsigned short sp_dest_port,
_32_bit sp_seq, _32_bit sp_ack,
unsigned short sp_flags)
{
char sp_buffer[1500];
struct sp_data_exchange sp_struct;
bzero(sp_buffer,1500);
if (sp_ipoptlen!=0)
memcpy(sp_buffer+SP_IP_HEAD_BASE,sp_data,sp_ipoptlen);
if (sp_tcpoptlen!=0)
memcpy(sp_buffer+SP_IP_HEAD_BASE+SP_TCP_HEAD_BASE+sp_ipoptlen,
sp_data+sp_ipoptlen,sp_tcpoptlen);
if (sp_datalen!=0)
memcpy(sp_buffer+SP_IP_HEAD_BASE+SP_TCP_HEAD_BASE+sp_ipoptlen+sp_tcpoptlen,
sp_data+sp_ipoptlen+sp_tcpoptlen,sp_datalen);
sp_struct.fd = sp_fd;
sp_struct.data = sp_data;
sp_struct.datalen = sp_datalen;
sp_struct.source = sp_source;
sp_struct.source_port = sp_source_port;
sp_struct.dest = sp_dest;
sp_struct.dest_port = sp_dest_port;
sp_struct.seq = sp_seq;
sp_struct.ack = sp_ack;
sp_struct.flags = sp_flags;
sp_struct.buffer = sp_buffer;
sp_struct.IP_optlen = sp_ipoptlen;
sp_struct.TCP_optlen = sp_tcpoptlen;
sp_fix_TCP_packet(&sp_struct);
sp_fix_IP_packet(&sp_struct, 6);
sp_send_packet(&sp_struct, 6);
}
void sp_fix_UDP_packet (struct sp_data_exchange *sp)
{
char sp_pseudo_ip_construct[MTU];
struct UDP_header *sp_help_udp;
struct pseudo_IP_header *sp_help_pseudo;
int i;
for(i=0;i<MTU;i++)
{sp_pseudo_ip_construct[i]=0;}
sp_help_udp = (struct UDP_header *) (sp->buffer+SP_IP_HEAD_BASE+sp->IP_optlen);
sp_help_pseudo = (struct pseudo_IP_header *) sp_pseudo_ip_construct;
sp_help_udp->source = htons(sp->source_port);
sp_help_udp->destination = htons(sp->dest_port);
sp_help_udp->length = htons(sp->datalen+SP_UDP_HEAD_BASE);
sp_help_pseudo->source = sp->source;
sp_help_pseudo->destination = sp->dest;
sp_help_pseudo->zero_byte = 0;
sp_help_pseudo->protocol = 17;
sp_help_pseudo->TCP_UDP_len = htons(sp->datalen+SP_UDP_HEAD_BASE);
memcpy(sp_pseudo_ip_construct+12, sp_help_udp, sp->datalen+SP_UDP_HEAD_BASE);
sp_help_udp->checksum=in_cksum((unsigned short *) sp_pseudo_ip_construct,
sp->datalen+12+SP_UDP_HEAD_BASE);
#ifdef DEBUG
printf("UDP header fixed...\n");
#endif
}
void transmit_UDP (int sp_fd, char *sp_data,
int sp_ipoptlen, int sp_datalen,
_32_bit sp_source, unsigned short sp_source_port,
_32_bit sp_dest, unsigned short sp_dest_port)
{
char sp_buffer[1500];
struct sp_data_exchange sp_struct;
bzero(sp_buffer,1500);
if (sp_ipoptlen!=0)
memcpy(sp_buffer+SP_IP_HEAD_BASE,sp_data,sp_ipoptlen);
if (sp_data!=NULL)
memcpy(sp_buffer+SP_IP_HEAD_BASE+SP_UDP_HEAD_BASE+sp_ipoptlen,
sp_data+sp_ipoptlen,sp_datalen);
sp_struct.fd = sp_fd;
sp_struct.data = sp_data;
sp_struct.datalen = sp_datalen;
sp_struct.source = sp_source;
sp_struct.source_port = sp_source_port;
sp_struct.dest = sp_dest;
sp_struct.dest_port = sp_dest_port;
sp_struct.buffer = sp_buffer;
sp_struct.IP_optlen = sp_ipoptlen;
sp_struct.TCP_optlen = 0;
sp_fix_UDP_packet(&sp_struct);
sp_fix_IP_packet(&sp_struct, 17);
sp_send_packet(&sp_struct, 17);
}
#endif
#endif
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