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mod_inbounds.c
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/*
* Copyright (c) 1994-2004
* Ohio University. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the
* distribution, and (3) all advertising materials mentioning features
* or use of this software display the following acknowledgment:
* ``This product includes software developed by the Ohio University
* Internetworking Research Laboratory.'' Neither the name of the
* University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific
* prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Author: Shawn Ostermann
* School of Electrical Engineering and Computer Science
* Ohio University
* Athens, OH
*
* Manikantan Ramadas
*/
#ifdef LOAD_MODULE_INBOUNDS
#include "tcptrace.h"
#include <fcntl.h>
#include <limits.h>
#include "mod_inbounds.h"
static int inc_cnt=0;
static int dointer_cnt=0;
static int udp_delconn_cnt=0;
// info kept for tcp packets:
struct inbounds_tcp_conn_info
{
timeval first_time; // time of the connection's first packet
timeval first_data_time; // time of the connection's first data packet
timeval last_time; // time of the connection's last packet
timeval last_data_time; // time of the connection's last data packet
Bool had_data;
Bool closed; // has the connection been closed ?
Bool new; // is the connection new ?
tcp_pair_addrblock addr_pair;
tcp_pair *ptp;
u_long a_pkt; /* number of packets from a to b within
the time interval */
u_long b_pkt;
u_long a_byte; /* number of bytes from a to b within
the time interval */
u_long b_byte;
u_int qNum;
u_int aNum;
u_long qSum;
u_long aSum;
timeval q2aIdle;
timeval a2qIdle;
Bool dir; /* 0 - question, 1 - answer */
u_long burst_bytes;
/* for determining bursts */
tcb *tcb_lastdata;
struct inbounds_tcp_conn_info *prev; /* pointer to the next connection */
struct inbounds_tcp_conn_info *next; /* pointer to the next connection */
};
typedef struct inbounds_tcp_conn_info itcinfo;
/* structure for udp connections */
struct inbounds_udp_conn_info
{
timeval first_time; // time of the connection's first packet
timeval last_time; // time of the connection's last packet
Bool closed; // has the connection been closed ?
Bool new; // is the connection new ?
udp_pair_addrblock addr_pair;
udp_pair *pup;
u_long a_pkt; /* number of packets from a to b within
the time interval */
u_long b_pkt;
u_long a_byte; /* number of bytes from a to b within
the time interval */
u_long b_byte;
u_int qNum;
u_int aNum;
u_long qSum;
u_long aSum;
timeval q2aIdle;
timeval a2qIdle;
Bool dir; /* 0 - question, 1 - answer */
struct inbounds_udp_conn_info *prev; /* pointer to the next connection */
struct inbounds_udp_conn_info *next; /* pointer to the next connection */
};
typedef struct inbounds_udp_conn_info iucinfo;
struct inbounds_info
{
// times of the last network statistics as it should appear in ideally
// for TCP and UDP:
timeval last_tcp_scheduled_time;
timeval last_udp_scheduled_time;
// times when the last network stats actually happened for TCP and UDP:
timeval last_tcp_actual_time;
timeval last_udp_actual_time;
itcinfo *tcp_conn_head; /* head of the list of tcp connections */
itcinfo *tcp_conn_tail; /* tail of the list of tcp connections */
u_short tcp_new_conn; /* number of new connections within the
time interval */
u_short tcp_total_conn; // number of currect active connections
/* this info is for UDP conn */
iucinfo *udp_conn_head; /* head of the list of udp connections */
iucinfo *udp_conn_tail; /* tail of the list of udp connections */
u_short udp_new_conn; /* number of new connections within the
time interval */
u_short udp_total_conn; /* number of currect udp active connections */
};
typedef struct inbounds_info iinfo;
struct protocol
{
u_char ip_p;
u_llong count;
struct protocol *next;
};
#define INBOUNDS_TCP_UPDATE_INTERVAL 60
#define INBOUNDS_UDP_UPDATE_INTERVAL 60
#define INBOUNDS_DEBUG 0 /* debug flag */
#define TCB_CACHE_A2B 0
#define TCB_CACHE_B2A 1
#define UDPHDR_LEN 8
#define UDP_A2B 0
#define UDP_B2A 1
/* global variables */
static iinfo *mod_info;
static u_llong tcp_packets = 0;
static u_llong udp_packets = 0;
static u_llong nontcpudp_packets = 0;
static struct protocol *plist = NULL;
/* local routines */
static void AllTCPInteractivity(void);
static void TCPInteractivity(itcinfo *conn);
static void AllUDPInteractivity(void);
static void UDPInteractivity(iucinfo *conn);
static void PrintUDPCMsg(iucinfo *);
static void ClosedUDPConn();
static Bool IsNewBurst(itcinfo *conn, tcb *ptcb, struct tcphdr *tcp, Bool dir);
static void ipCheck(struct ip *pip, void *plast);
static void tcpCheck(struct ip *pip, tcp_pair *ptcp, void *plast);
static void udpCheck(struct ip *pip, udp_pair *pup, void *plast);
static itcinfo *Makeitcinfo(void);
static iucinfo *Makeiucinfo(void);
static void Freeitcinfo(itcinfo *);
static void Freeiucinfo(iucinfo *);
/* declarations of memory management functions for the module */
static long itcinfo_pool = -1;
static long iucinfo_pool = -1;
/* tcp packet */
static itcinfo *
Makeitcinfo(
void)
{
itcinfo *ptr = NULL;
if (itcinfo_pool < 0) {
itcinfo_pool = MakeMemPool(sizeof(itcinfo), 0);
}
ptr = PoolMalloc(itcinfo_pool, sizeof(itcinfo));
return ptr;
}
/* udp packet */
static iucinfo *
Makeiucinfo(
void)
{
iucinfo *ptr = NULL;
if (iucinfo_pool < 0) {
iucinfo_pool = MakeMemPool(sizeof(iucinfo), 0);
}
ptr = PoolMalloc(iucinfo_pool, sizeof(iucinfo));
return ptr;
}
static void
Freeitcinfo(
itcinfo *ptr)
{
PoolFree(itcinfo_pool, ptr);
}
static void
Freeiucinfo(
iucinfo *ptr)
{
PoolFree(iucinfo_pool, ptr);
}
/* Usage message for using the INBOUNDS module */
void
inbounds_usage(void)
{
printf("Use -xinbounds to call INBOUNDS and add -u for UDP conn. analysis\
\n");
}
int
inbounds_init(
int argc,
char *argv[])
{
int i, fd;
int enable=0;
/* look for "-xinbounds" */
for (i=1; i < argc; ++i) {
if (!argv[i])
continue; /* argument already taken by another module... */
if (strncmp(argv[i],"-x",2) == 0) {
if (strncasecmp(argv[i]+2,"inbounds", 8) == 0) {
/* I want to be called */
enable = 1;
// We *are* running the program in real-time mode
run_continuously=TRUE;
if(INBOUNDS_DEBUG)
fprintf(stderr, "mod_inbounds: Capturing traffic\n");
argv[i] = NULL;
}
}
}
if (!enable)
return(0); /* don't call me again */
mod_info = (iinfo *)malloc(sizeof(iinfo));
mod_info->last_tcp_scheduled_time = current_time;
mod_info->last_tcp_actual_time = current_time;
mod_info->last_udp_scheduled_time = current_time;
mod_info->last_udp_actual_time = current_time;
mod_info->tcp_conn_head = NULL;
mod_info->tcp_conn_tail = NULL;
mod_info->tcp_new_conn = 0;
mod_info->tcp_total_conn = 0;
mod_info->udp_conn_head = NULL;
mod_info->udp_conn_tail = NULL;
mod_info->udp_new_conn = 0;
mod_info->udp_total_conn = 0;
resolve_ipaddresses = FALSE;
resolve_ports = FALSE;
return(1); /* TRUE means call other inbounds routines later */
}
void
inbounds_done(void)
{
struct protocol *pp;
// When we are simulating attack, i.e feed just the attack to this module
// un-domment the following section to wash out the attack at the end
// to produce 'U' and 'C' messages.
if(do_udp) {
// iucinfo *udp_conn;
ClosedUDPConn();
/* for (udp_conn=mod_info->udp_conn_head; udp_conn!=NULL;
udp_conn=udp_conn->next) {
if(!udp_conn->closed) {
// Assume that its been UDP_REMOVE_LIVE_CONN_INTERVAL
// since we had the last message on this connection
current_time.tv_sec=udp_conn->last_time.tv_sec+
UDP_REMOVE_LIVE_CONN_INTERVAL;
UDPInteractivity(udp_conn);
udp_conn->closed=TRUE;
PrintUDPCMsg(udp_conn);
}
}*/
}
#ifdef HAVE_LONG_LONG
fprintf(stderr, "\nINBOUNDS: TCP packets - %llu\n", tcp_packets);
fprintf(stderr, "INBOUNDS: UDP packets - %llu\n", udp_packets);
fprintf(stderr, "INBOUNDS: other packets - %llu\n", nontcpudp_packets);
#else
fprintf(stderr, "\nINBOUNDS: TCP packets - %lu\n", tcp_packets);
fprintf(stderr, "INBOUNDS: UDP packets - %lu\n", udp_packets);
fprintf(stderr, "INBOUNDS: other packets - %lu\n", nontcpudp_packets);
#endif
for (pp = plist; pp; pp = pp->next) {
#ifdef HAVE_LONG_LONG
fprintf(stderr, "\tprotocol: %3u, number: %llu\n", pp->ip_p, pp->count);
#else
fprintf(stderr, "\tprotocol: %3u, number: %lu\n", pp->ip_p, pp->count);
#endif
}
fprintf(stderr, "\n");
}
/* for a new TCP connection */
void *
inbounds_tcp_newconn(
tcp_pair *ptp)
{
itcinfo *newConn = Makeitcinfo();
if (mod_info->last_tcp_scheduled_time.tv_sec == 0) {
mod_info->last_tcp_scheduled_time = current_time;
mod_info->last_tcp_actual_time = current_time;
}
newConn->first_time = current_time;
newConn->first_data_time.tv_sec = 0;
newConn->first_data_time.tv_usec = 0;
newConn->last_time = current_time;
newConn->last_data_time.tv_sec = 0;
newConn->last_data_time.tv_usec = 0;
newConn->had_data = FALSE;
newConn->new = TRUE;
newConn->closed = FALSE;
newConn->addr_pair = ptp->addr_pair;
newConn->ptp = ptp;
newConn->a_pkt = 0;
newConn->b_pkt = 0;
newConn->a_byte = 0;
newConn->b_byte = 0;
newConn->next = NULL;
newConn->prev = NULL;
newConn->tcb_lastdata = &ptp->a2b;
newConn->qNum = 0;
newConn->aNum = 0;
newConn->qSum = 0;
newConn->aSum = 0;
newConn->q2aIdle.tv_sec = 0; newConn->q2aIdle.tv_usec = 0;
newConn->a2qIdle.tv_sec = 0; newConn->a2qIdle.tv_usec = 0;
newConn->dir = TCB_CACHE_A2B;
if (mod_info->tcp_conn_head != NULL) {
mod_info->tcp_conn_tail->next = newConn;
newConn->prev = mod_info->tcp_conn_tail;
mod_info->tcp_conn_tail = newConn;
}
else { /* the list is empty */
mod_info->tcp_conn_head = newConn;
mod_info->tcp_conn_tail = newConn;
}
mod_info->tcp_total_conn++;
return newConn;
}
/* delete TCP connection */
void
inbounds_tcp_deleteconn(
tcp_pair *ptp, /* info I have about this connection */
void *mod_data) /* module specific info for this conn*/
{
itcinfo *conn = mod_data;
Bool done = FALSE;
if (conn == mod_info->tcp_conn_head) {
mod_info->tcp_conn_head = mod_info->tcp_conn_head->next;
if (mod_info->tcp_conn_head) {
mod_info->tcp_conn_head->prev = NULL;
}
done = TRUE;
}
if (conn == mod_info->tcp_conn_tail) {
mod_info->tcp_conn_tail = mod_info->tcp_conn_tail->prev;
if (mod_info->tcp_conn_tail) {
mod_info->tcp_conn_tail->next = NULL;
}
done = TRUE;
}
if (!done) {
conn->prev->next = conn->next;
conn->next->prev = conn->prev;
}
Freeitcinfo(conn);
return;
}
/* For TCP packets
* If this packet opens a new connections then output the 'O' message.
* Grab the information required to generate the update messages.
*/
void
inbounds_tcp_read(
struct ip *pip, /* the packet */
tcp_pair *ptp, /* info I have about this connection */
void *plast, /* past byte in the packet */
void *mod_data) /* module specific info for this
connection */
{
char *tmp;
struct tcphdr *tcp;/* TCP header information */
int data_len = 0; /* length of the data cargo in the packet */
itcinfo *conn = mod_data;
timeval delta;
tcb *ptcb;
int dir;
int status = 0;
double dtime = 0;
++tcp_packets;
#ifdef _MONITOR
ipCheck(pip, plast);
tcpCheck(pip, ptp, plast);
#endif
/* first, discard any connections that we aren't interested in. */
/* That means that pmodstruct is NULL */
if (conn == NULL) {
return;
}
if (0) {
printf("hash %i\t\tclosed %i, a2bfin %i, b2afin %i\n",
ptp->addr_pair.hash, conn->closed,
ptp->a2b.fin_count, ptp->b2a.fin_count);
fflush(stdout);
}
if (conn->new) {
if (ptp->a2b.syn_count > 0) {
status = 0;
} else if (ptp->b2a.syn_count > 0) {
status = 0;
conn->dir = TCB_CACHE_B2A;
} else {
status = 1;
if (conn->addr_pair.a_port < conn->addr_pair.b_port) {
conn->dir = TCB_CACHE_B2A;
}
}
dtime = current_time.tv_sec + (current_time.tv_usec / 1000000.0);
if ((tmp=(char*)calloc(MAX_LINE_LEN,sizeof(char)))==NULL) {
fprintf(stderr,"mod_inbounds: calloc() failed\n");
exit(-1);
}
sprintf(tmp, "O %.6f TCP %s %s %i\n",
dtime, ptp->a_endpoint, ptp->b_endpoint, status);
if (fwrite(tmp, strlen(tmp), 1, stdout) <= 0) {
fprintf(stderr, "Couldn't write to stdout\n");
exit(1);
}
fflush(stdout);
free(tmp);
conn->new = FALSE;
}
/* Setting a pointer to the beginning of the TCP header */
#ifdef IP_IPVHL
tcp = (struct tcphdr *) ((char *)pip + (4 * (pip->ip_vhl & 0x0f)));
#else
tcp = (struct tcphdr *) ((char *)pip + (4 * pip->ip_hl));
#endif
/* calculate the amount of user data */
data_len = ntohs(pip->ip_len) - /* size of entire IP packet (and IP header) */
#ifdef IP_IPVHL
(4 * (pip->ip_vhl & 0x0f)) - /* less the IP header */
#else
(4 * pip->ip_hl) - /* less the IP header */
#endif
#ifdef TCP_THXOFF
(4 * (tcp->th_xoff >> 4)); /* less the TCP header */
#else
(4 * tcp->th_off); /* less the TCP header */
#endif
/* see which of the 2 TCB's this goes with */
if (ptp->addr_pair.a_port == ntohs(tcp->th_sport)) {
ptcb = &ptp->a2b;
dir = TCB_CACHE_A2B;
} else {
ptcb = &ptp->b2a;
dir = TCB_CACHE_B2A;
}
if (0)
printf("INBOUNDS: %s <-> %s; dir = %i ",
ptp->a_endpoint, ptp->b_endpoint, dir);
if (debug > 2) {
printf("conn %s<->%s, my dir=%i, packet's dir=%i; IsNewBurst=",
ptp->a_endpoint, ptp->b_endpoint, conn->dir, dir);
}
if (data_len > 0) {
if (tv_lt(conn->first_data_time, conn->first_time)) {
conn->first_data_time = current_time;
conn->had_data = TRUE;
}
}
/* see if it's a new burst */
if (!conn->closed) {
if (((data_len > 0) && (IsNewBurst(conn, ptcb, tcp, dir))) ||
((FIN_SET(tcp)) && (FinCount(ptp) == 1)) ||
(RESET_SET(tcp))) {
delta = current_time;
tv_sub(&delta, conn->last_data_time);
if (FIN_SET(tcp) || RESET_SET(tcp)) {
if (conn->had_data) {
if (conn->dir == 0) { /* we had a question before */
conn->dir = 1;
conn->qNum++;
conn->qSum += conn->burst_bytes;
tv_add(&conn->q2aIdle, delta);
}
else { /* we had an answer before */
conn->dir = 0; /* we have question */
conn->aNum++; /* number of complete answers */
conn->aSum += conn->burst_bytes;
tv_add(&conn->a2qIdle, delta);
}
}
}
else {
if (dir == TCB_CACHE_A2B) {
conn->dir = 0; /* we have question */
conn->aNum++; /* number of complete answers */
conn->aSum += conn->burst_bytes;
tv_add(&conn->a2qIdle, delta);
}
else {
conn->dir = 1;
conn->qNum++;
conn->qSum += conn->burst_bytes;
tv_add(&conn->q2aIdle, delta);
}
}
conn->burst_bytes = 0;
if (0) {
fprintf(stderr, "%.6f switching direction from %s to %s, idle time is %.6f\n",
current_time.tv_sec + (current_time.tv_usec / 1000000.0),
(conn->dir == 0) ? "answer" : "question",
(conn->dir == 0) ? "question" : "answer",
delta.tv_sec + (delta.tv_usec / 100000.0));
}
if (debug > 2)
printf("true ");
}
}
if (data_len > 0) {
conn->last_data_time = current_time;
conn->burst_bytes += data_len;
}
conn->last_time = current_time;
status = 0;
if (!conn->closed) {
if ((FinCount(ptp) >= 1) || (ConnReset(ptp))) {
if (0) {
fprintf(stderr, "number of questions: %i, number of answers: %i\n",
conn->qNum, conn->aNum);
}
TCPInteractivity(conn);
if (dtime == 0) {
dtime = current_time.tv_sec + (current_time.tv_usec / 1000000.0);
}
if ((ptp->a2b.reset_count >=1) || (ptp->b2a.reset_count >= 1)) {
status = 1;
}
if ((tmp=(char*)calloc(MAX_LINE_LEN,sizeof(char)))==NULL) {
fprintf(stderr,"mod_inbounds: calloc() failed\n");
exit(-1);
}
sprintf(tmp, "C %.6f TCP %s %s %i\n",
dtime, ptp->a_endpoint, ptp->b_endpoint, status);
if (fwrite(tmp, strlen(tmp), 1, stdout) <= 0) {
fprintf(stderr, "mod_inbounds: couldn't write to stdout\n"
);
exit(1);
}
fflush(stdout);
free(tmp);
conn->closed = TRUE;
}
}
if ((elapsed(mod_info->last_tcp_scheduled_time, current_time) / 1000000.0)
>= INBOUNDS_TCP_UPDATE_INTERVAL) {
AllTCPInteractivity();
}
}
/* for new UDP connections */
void *
inbounds_udp_newconn(
udp_pair *pup)
{
iucinfo *newConn = Makeiucinfo();
inc_cnt++;
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_newconn() \n");
if (mod_info->last_udp_scheduled_time.tv_sec == 0) {
mod_info->last_udp_scheduled_time = current_time;
mod_info->last_udp_actual_time = current_time;
}
newConn->first_time = current_time;
newConn->last_time = current_time;
newConn->new = TRUE;
newConn->closed = FALSE;
newConn->addr_pair = pup->addr_pair;
newConn->pup = pup;
newConn->a_pkt = 0;
newConn->b_pkt = 0;
newConn->a_byte = 0;
newConn->b_byte = 0;
newConn->next = NULL;
newConn->prev = NULL;
newConn->qNum = 0;
newConn->aNum = 0;
newConn->qSum = 0;
newConn->aSum = 0;
// If this field remains -1, it means
// q2aIdle could not be calculated for
// INBOUNDS_UDP_UPDATE_INTERVAL.
// In that case, we shall print out
// q2aIdle as = INBOUNDS_UDP_UPDATE_INTERVAL, i.e. q2a duration is max.
newConn->q2aIdle.tv_sec = -1;
newConn->q2aIdle.tv_usec = 0;
newConn->a2qIdle.tv_sec = -1;
newConn->a2qIdle.tv_usec = 0;
newConn->dir = UDP_A2B;
if (mod_info->udp_conn_head != NULL) {
mod_info->udp_conn_tail->next = newConn;
newConn->prev = mod_info->udp_conn_tail;
mod_info->udp_conn_tail = newConn;
}
else {
mod_info->udp_conn_head = newConn;
mod_info->udp_conn_tail = newConn;
}
mod_info->udp_total_conn++;
return newConn;
}
/* This function is not invoked by tcptrace currently and is here mostly
* for the sake of completeness. You may need to fix the module definition
* in modules.h and fix tcptrace.c/trace.c to make sure this function gets
* invoked (if you need this functionality, of course) - Mani, 4 Mar 2004.
*/
/* delete timedout UDP connections */
void
inbounds_udp_deleteconn(
udp_pair *pup, // info I have about this conn.
void *mod_data)// module specific info for this
//conn.
{
iucinfo *conn = mod_data;
Bool done = FALSE;
udp_delconn_cnt++;
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_deleteconn() \n");
if (conn == mod_info->udp_conn_head) {
mod_info->udp_conn_head = mod_info->udp_conn_head->next;
if (mod_info->udp_conn_head) {
mod_info->udp_conn_head->prev = NULL;
}
done = TRUE;
}
if (conn == mod_info->udp_conn_tail) {
mod_info->udp_conn_tail = mod_info->udp_conn_tail->prev;
if (mod_info->udp_conn_tail) {
mod_info->udp_conn_tail->next = NULL;
}
done = TRUE;
}
if (!done) {
conn->prev->next = conn->next;
conn->next->prev = conn->prev;
}
if(!conn->closed) {
UDPInteractivity(conn);
PrintUDPCMsg(conn);
}
Freeiucinfo(conn);
return;
}
/* For UDP packets
* If this packet opens a new connections then output the 'O' message.
* Grab the information required to generate the update messages
*/
void
inbounds_udp_read(
struct ip *pip,
udp_pair *pup,
void *plast,
void *mod_data)
{
char *tmp;
struct udphdr *udp; /* UDP header information */
int data_len = 0; /* length of the data cargo in the packet */
iucinfo *conn = mod_data;
timeval delta;
int dir;
int status = 0;
double dtime = 0;
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_read() \n");
++udp_packets;
#ifdef _MONITOR
ipCheck(pip, plast);
udpCheck(pip, pup, plast);
#endif
/* first, discard any connections that we aren't interested in. */
/* That means that pmodstruct is NULL */
if (conn == NULL || pup == NULL) {
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_read() conn is NULL or pup \n");
return;
}
if (conn->new) {
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_read() This is new connection\n");
dtime = current_time.tv_sec + (current_time.tv_usec / 1000000.0);
if(INBOUNDS_DEBUG) {
printf("dtime: %.6f \n",dtime);
printf("pup->a_endpoint: %s \n",pup->a_endpoint);
printf("pup->b_endpoint: %s \n",pup->b_endpoint);
}
if ((tmp=(char*)calloc(MAX_LINE_LEN,sizeof(char)))==NULL) {
fprintf(stderr,"mod_inbounds: calloc() failed\n");
exit(-1);
}
sprintf(tmp, "O %.6f UDP %s %s %i\n",
dtime, pup->a_endpoint, pup->b_endpoint, status);
if (fwrite(tmp, strlen(tmp), 1, stdout) <= 0) {
fprintf(stderr, "mod_inbounds: couldn't write to stdout\n");
exit(1);
}
fflush(stdout);
free(tmp);
conn->new = FALSE;
}
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_read() datalen is being calculated \n");
/* Setting a pointer to the beginning of the TCP header */
#ifdef IP_IPVHL
udp = (struct udphdr *) ((char *)pip + (4 * (pip->ip_vhl & 0x0f)));
#else
udp = (struct udphdr *) ((char *)pip + (4 * pip->ip_hl));
#endif
/* calculate the amount of user data */
data_len = ntohs(pip->ip_len) -
/* size of entire IP packet (and IP header) */
#ifdef IP_IPVHL
(4 * (pip->ip_vhl & 0x0f)) - /* less the IP header */
#else
(4 * pip->ip_hl) - /* less the IP header */
#endif
UDPHDR_LEN;
if(INBOUNDS_DEBUG)
printf("mod_inbounds: udp_read() datalen:%d \n",data_len);
/* see in which direction this goes with */
if (INBOUNDS_DEBUG) {
printf("INBOUNDS: %d \n",
pup->addr_pair.a_port);
printf("INBOUNDS: %d \n",
ntohs(udp->uh_sport));
}
// Do anything at all if only we captured the headers fully
if(data_len >= 0) {
if (pup->addr_pair.a_port == ntohs(udp->uh_sport))
dir = UDP_A2B;
else
dir = UDP_B2A;
/* if (data_len > 0) { // this packet has data in it
*
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_read() this packet has data in it\n");
if (tv_lt(conn->first_data_time, conn->first_time)) {
conn->first_data_time = current_time;
conn->had_data = TRUE;
}
*/
delta=current_time;
tv_sub(&delta,conn->last_time);
conn->last_time = current_time;
if(dir == UDP_A2B) {// this is a question
// If what we had before was an answer, we can calculate AQIT
if(conn->dir==UDP_B2A) {
if(conn->a2qIdle.tv_sec==-1) {// First sample in the last
// INBOUNDS_UPDATE_INTERVAL
conn->a2qIdle.tv_sec=0.0;
conn->a2qIdle.tv_usec=0.0;
tv_add(&conn->a2qIdle,delta);
}
else {
tv_add(&conn->a2qIdle,delta);
}
}
conn->dir = UDP_A2B;
conn->qNum++;
conn->qSum += data_len;
}
else {// this is an answer
// If what we had before was a question, we can calculate QAIT
Bool done = FALSE;
if(conn->dir==UDP_A2B) {
if(conn->q2aIdle.tv_sec==-1) {// First sample in the last
// INBOUNDS_UPDATE_INTERVAL
conn->q2aIdle.tv_sec=0.0;
conn->q2aIdle.tv_usec=0.0;
tv_add(&conn->q2aIdle,delta);
}
else {
tv_add(&conn->q2aIdle,delta);
}
}
conn->dir = UDP_B2A;
conn->aNum++;
conn->aSum += data_len;
}
} // END: if data_len >= 0
/* Do the interactivity - it has to be done for both TCP and UDP */
if ((elapsed(mod_info->last_udp_scheduled_time, current_time) / 1000000.0)
>= INBOUNDS_UDP_UPDATE_INTERVAL) {
AllUDPInteractivity();
}
if(INBOUNDS_DEBUG)
printf("mod_inbounds:udp_read() exiting udp_read \n");
}
/* call the respective TCP and UDP routines to print the update messages */
static void
AllTCPInteractivity(void)
{
itcinfo *tcp_conn;
if(INBOUNDS_DEBUG)
printf("mod_inbounds: in AllTCPInteractivity() \n");
for (tcp_conn = mod_info->tcp_conn_head; tcp_conn != NULL;
tcp_conn = tcp_conn->next) {
if (!tcp_conn->closed) {
TCPInteractivity(tcp_conn);
}
}
mod_info->last_tcp_scheduled_time.tv_sec += INBOUNDS_TCP_UPDATE_INTERVAL;
mod_info->last_tcp_actual_time = current_time;
}
/* calculate and print out interactivity statistics for TCP connections */
static void
TCPInteractivity(
itcinfo *conn)
{
char *tmp;
double qAvg;
double aAvg;
double q2aIdle;
double a2qIdle;
double dtime;
double update_interval;
timeval first_time;
if ((tmp=(char*)calloc(MAX_LINE_LEN,sizeof(char)))==NULL) {
fprintf(stderr,"itcptrace : calloc() failed\n");
exit(-1);
}
if (conn->had_data) {
first_time = conn->first_data_time;
}
else {
first_time = conn->first_time;
}
if (tv_lt(mod_info->last_tcp_actual_time, first_time)) {
update_interval = elapsed(conn->first_data_time, current_time) /
1000000.0;
/* if this is the first packet belonging to the connection,
we don't need to print statistics */
if (update_interval == 0)
return;
}
else {
update_interval = elapsed(mod_info->last_tcp_actual_time,
current_time) / 1000000.0;
}
if (update_interval < 1.0) {
update_interval = 1.0;
}
if (conn->qNum != 0) {