1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*
*
* This is free software. You can redistribute it and/or modify under
* the terms of the GNU General Public License version 2.
*
* Copyright (C) 1998 by kra
*
*/
#include "hunt.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
/*
* reset tcp connection
*/
void user_rst(struct user_conn_info *uci, int count, int mode)
{
struct conn_info *ci;
unsigned int key;
if (!(ci = conn_get(uci)))
printf("connection isn't available\n");
else {
switch (mode) {
case MODE_BOTH:
rst(ci, count, 0);
rst(ci, count, 1);
break;
case MODE_SRC:
rst(ci, count, 0);
break;
case MODE_DST:
rst(ci, count, 1);
break;
}
/*
* well we don't receive RST packet, because we are the one
* who is sending it so we have to remove it by hand
*/
key = uci_generate_key(uci);
hash_remove(&conn_table, key, uci);
conn_free(ci);
}
}
void rst(struct conn_info *ci, int count, int rstdst)
{
struct tcp_spec ts;
int i;
if (rstdst) {
ts.saddr = ci->src_addr;
ts.daddr = ci->dst_addr;
ts.sport = ci->src_port;
ts.dport = ci->dst_port;
ts.src_mac = ci->dst.dst_mac;
ts.dst_mac = ci->dst.src_mac;
ts.window = ci->src.window ? ci->src.window : htons(242);
ts.id = ci->src.id;
} else {
ts.saddr = ci->dst_addr;
ts.daddr = ci->src_addr;
ts.sport = ci->dst_port;
ts.dport = ci->src_port;
ts.src_mac = ci->src.dst_mac;
ts.dst_mac = ci->src.src_mac;
ts.window = ci->dst.window ? ci->dst.window : htons(242);
ts.id = ci->dst.id;
}
ts.ack = 1;
ts.rst = 1;
ts.psh = 0;
ts.data = NULL;
ts.data_len = 0;
for (i = 0; i < count; i++) {
if (rstdst) {
ts.seq = htonl(ntohl(ci->dst.next_d_seq) + i);
ts.ack_seq = htonl(ntohl(ci->dst.next_seq) + i);
} else {
ts.seq = htonl(ntohl(ci->src.next_d_seq) + i);
ts.ack_seq = htonl(ntohl(ci->src.next_seq) + i);
}
send_tcp_packet(&ts);
}
}
|
