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/* $FreeBSD$ */
/*
* (C)opyright 1995-1998 Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
*/
#include <stdio.h>
#include <fcntl.h>
#include <signal.h>
#include <malloc.h>
#include <netdb.h>
#include <string.h>
#include <sys/dir.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#ifndef linux
#include <netinet/ip_var.h>
#include <netinet/tcpip.h>
#endif
#include "ip_compat.h"
#ifdef linux
#include <linux/sockios.h>
#include "tcpip.h"
#endif
#include "ipsd.h"
#ifndef lint
static const char sccsid[] = "@(#)ipsdr.c 1.3 12/3/95 (C)1995 Darren Reed";
static const char rcsid[] = "@(#)$Id: ipsdr.c,v 2.2 2001/06/09 17:09:25 darrenr Exp $";
#endif
extern char *optarg;
extern int optind;
#define NPORTS 21
u_short defports[NPORTS] = {
7, 9, 20, 21, 23, 25, 53, 69, 79, 111,
123, 161, 162, 512, 513, 513, 515, 520, 540, 6000, 0
};
u_short pweights[NPORTS] = {
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
};
ipsd_t *iphits[NPORTS];
int pkts;
int ipcmp(sh1, sh2)
sdhit_t *sh1, *sh2;
{
return sh1->sh_ip.s_addr - sh2->sh_ip.s_addr;
}
int ssipcmp(sh1, sh2)
ipss_t *sh1, *sh2;
{
return sh1->ss_ip.s_addr - sh2->ss_ip.s_addr;
}
int countpbits(num)
u_long num;
{
int i, j;
for (i = 1, j = 0; i; i <<= 1)
if (num & i)
j++;
return j;
}
/*
* Check to see if we've already received a packet from this host for this
* port.
*/
int findhit(ihp, src, dport)
ipsd_t *ihp;
struct in_addr src;
u_short dport;
{
int i, j, k;
sdhit_t *sh;
sh = NULL;
if (ihp->sd_sz == 4) {
for (i = 0, sh = ihp->sd_hit; i < ihp->sd_cnt; i++, sh++)
if (src.s_addr == sh->sh_ip.s_addr)
return 1;
} else {
for (i = ihp->sd_cnt / 2, j = (i / 2) - 1; j >= 0; j--) {
k = ihp->sd_hit[i].sh_ip.s_addr - src.s_addr;
if (!k)
return 1;
else if (k < 0)
i -= j;
else
i += j;
}
}
return 0;
}
/*
* Search for port number amongst the sorted array of targets we're
* interested in.
*/
int detect(srcip, dport, date)
struct in_addr srcip;
u_short dport;
time_t date;
{
ipsd_t *ihp;
sdhit_t *sh;
int i, j, k;
for (i = 10, j = 4; j >= 0; j--) {
k = dport - defports[i];
if (!k) {
ihp = iphits[i];
if (findhit(ihp, srcip, dport))
return 0;
sh = ihp->sd_hit + ihp->sd_cnt;
sh->sh_date = date;
sh->sh_ip = srcip;
if (++ihp->sd_cnt == ihp->sd_sz)
{
ihp->sd_sz += 8;
sh = realloc(sh, ihp->sd_sz * sizeof(*sh));
ihp->sd_hit = sh;
}
qsort(sh, ihp->sd_cnt, sizeof(*sh), ipcmp);
return 0;
}
if (k < 0)
i -= j;
else
i += j;
}
return -1;
}
/*
* Allocate initial storage for hosts
*/
setuphits()
{
int i;
for (i = 0; i < NPORTS; i++) {
if (iphits[i]) {
if (iphits[i]->sd_hit)
free(iphits[i]->sd_hit);
free(iphits[i]);
}
iphits[i] = (ipsd_t *)malloc(sizeof(ipsd_t));
iphits[i]->sd_port = defports[i];
iphits[i]->sd_cnt = 0;
iphits[i]->sd_sz = 4;
iphits[i]->sd_hit = (sdhit_t *)malloc(sizeof(sdhit_t) * 4);
}
}
/*
* Write statistics out to a file
*/
addfile(file)
char *file;
{
ipsd_t ipsd, *ips = &ipsd;
sdhit_t hit, *hp;
char fname[32];
int i, fd, sz;
if ((fd = open(file, O_RDONLY)) == -1) {
perror("open");
return;
}
printf("opened %s\n", file);
do {
if (read(fd, ips, sizeof(*ips)) != sizeof(*ips))
break;
sz = ips->sd_sz * sizeof(*hp);
hp = (sdhit_t *)malloc(sz);
if (read(fd, hp, sz) != sz)
break;
for (i = 0; i < ips->sd_cnt; i++)
detect(hp[i].sh_ip, ips->sd_port, hp[i].sh_date);
} while (1);
(void) close(fd);
}
readfiles(dir)
char *dir;
{
struct direct **d;
int i, j;
d = NULL;
i = scandir(dir, &d, NULL, NULL);
for (j = 0; j < i; j++) {
if (strncmp(d[j]->d_name, "ipsd-hits.", 10))
continue;
addfile(d[j]->d_name);
}
}
void printreport(ss, num)
ipss_t *ss;
int num;
{
struct in_addr ip;
ipss_t *sp;
int i, j, mask;
u_long ports;
printf("Hosts detected: %d\n", num);
if (!num)
return;
for (i = 0; i < num; i++)
printf("%s %d %d\n", inet_ntoa(ss[i].ss_ip), ss[i].ss_hits,
countpbits(ss[i].ss_ports));
printf("--------------------------\n");
for (mask = 0xfffffffe, j = 32; j; j--, mask <<= 1) {
ip.s_addr = ss[0].ss_ip.s_addr & mask;
ports = ss[0].ss_ports;
for (i = 1; i < num; i++) {
sp = ss + i;
if (ip.s_addr != (sp->ss_ip.s_addr & mask)) {
printf("Netmask: 0x%08x\n", mask);
printf("%s %d\n", inet_ntoa(ip),
countpbits(ports));
ip.s_addr = sp->ss_ip.s_addr & mask;
ports = 0;
}
ports |= sp->ss_ports;
}
if (ports) {
printf("Netmask: 0x%08x\n", mask);
printf("%s %d\n", inet_ntoa(ip), countpbits(ports));
}
}
}
collectips()
{
ipsd_t *ips;
ipss_t *ss;
int i, num, nip, in, j, k;
for (i = 0; i < NPORTS; i++)
nip += iphits[i]->sd_cnt;
ss = (ipss_t *)malloc(sizeof(ipss_t) * nip);
for (in = 0, i = 0, num = 0; i < NPORTS; i++) {
ips = iphits[i];
for (j = 0; j < ips->sd_cnt; j++) {
for (k = 0; k < num; k++)
if (!bcmp(&ss[k].ss_ip, &ips->sd_hit[j].sh_ip,
sizeof(struct in_addr))) {
ss[k].ss_hits += pweights[i];
ss[k].ss_ports |= (1 << i);
break;
}
if (k == num) {
ss[num].ss_ip = ips->sd_hit[j].sh_ip;
ss[num].ss_hits = pweights[i];
ss[k].ss_ports |= (1 << i);
num++;
}
}
}
qsort(ss, num, sizeof(*ss), ssipcmp);
printreport(ss, num);
}
main(argc, argv)
int argc;
char *argv[];
{
char c, *name = argv[0], *dir = NULL;
int fd;
setuphits();
dir = dir ? dir : ".";
readfiles(dir);
collectips();
}
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