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/*
* (C)opyright 1993,1994,1995 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#include <stdio.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/syslog.h>
#include <sys/errno.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/uio.h>
#if !defined(__SVR4) && !defined(__svr4__)
#include <sys/dir.h>
#include <sys/mbuf.h>
#else
#include <sys/byteorder.h>
#endif
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/user.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include <netdb.h>
#include <arpa/inet.h>
#ifndef lint
static char sccsid[] = "@(#)ipmon.c 1.16 1/12/96 (C)1995 Darren Reed";
#endif
#include "ip_fil.h"
struct flags {
int value;
char flag;
};
struct flags tcpfl[] = {
{ TH_ACK, 'A' },
{ TH_RST, 'R' },
{ TH_SYN, 'S' },
{ TH_FIN, 'F' },
{ TH_URG, 'U' },
{ TH_PUSH,'P' },
{ 0, '\0' }
};
static char line[2048];
static void printpacket();
char *hostname(res, ip)
int res;
struct in_addr ip;
{
struct hostent *hp;
if (!res)
return inet_ntoa(ip);
hp = gethostbyaddr((char *)&ip, sizeof(ip), AF_INET);
if (!hp)
return inet_ntoa(ip);
return hp->h_name;
}
char *portname(res, proto, port)
int res;
char *proto;
u_short port;
{
static char pname[8];
struct servent *serv;
(void) sprintf(pname, "%hu", htons(port));
if (!res)
return pname;
serv = getservbyport((int)port, proto);
if (!serv)
return pname;
return serv->s_name;
}
static void printpacket(log, ip, lp, opts)
FILE *log;
struct ip *ip;
struct ipl_ci *lp;
int opts;
{
struct protoent *pr;
struct tcphdr *tp;
struct icmp *ic;
struct ip *ipc;
struct tm *tm;
char c[3], pname[8], *t, *proto;
u_short hl, p;
int i, lvl, res;
res = (opts & 2) ? 1 : 0;
t = line;
*t = '\0';
hl = (ip->ip_hl << 2);
p = (u_short)ip->ip_p;
tm = localtime((time_t *)&lp->sec);
if (!(opts & 1)) {
(void) sprintf(t, "%2d/%02d/%4d ",
tm->tm_mday, tm->tm_mon + 1, tm->tm_year + 1900);
t += strlen(t);
}
(void) sprintf(t, "%02d:%02d:%02d.%-.6ld %c%c%ld @%hd ",
tm->tm_hour, tm->tm_min, tm->tm_sec, lp->usec,
lp->ifname[0], lp->ifname[1], lp->unit, lp->rule);
pr = getprotobynumber((int)p);
if (!pr) {
proto = pname;
sprintf(proto, "%d", (u_int)p);
} else
proto = pr->p_name;
if (lp->flags & (FI_SHORT << 20)) {
c[0] = 'S';
lvl = LOG_ERR;
} else if (lp->flags & FR_PASS) {
if (lp->flags & FR_LOGP)
c[0] = 'p';
else
c[0] = 'P';
lvl = LOG_NOTICE;
} else if (lp->flags & FR_BLOCK) {
if (lp->flags & FR_LOGB)
c[0] = 'b';
else
c[0] = 'B';
lvl = LOG_WARNING;
} else if (lp->flags & FF_LOGNOMATCH) {
c[0] = 'n';
lvl = LOG_NOTICE;
} else {
c[0] = 'L';
lvl = LOG_INFO;
}
c[1] = ' ';
c[2] = '\0';
(void) strcat(line, c);
t = line + strlen(line);
#if SOLARIS
ip->ip_off = ntohs(ip->ip_off);
ip->ip_len = ntohs(ip->ip_len);
#endif
if ((p == IPPROTO_TCP || p == IPPROTO_UDP) && !(ip->ip_off & 0x1fff)) {
tp = (struct tcphdr *)((char *)ip + hl);
if (!(lp->flags & (FI_SHORT << 16))) {
(void) sprintf(t, "%s,%s -> ",
hostname(res, ip->ip_src),
portname(res, proto, tp->th_sport));
t += strlen(t);
(void) sprintf(t, "%s,%s PR %s len %hu %hu ",
hostname(res, ip->ip_dst),
portname(res, proto, tp->th_dport),
proto, hl, ip->ip_len);
t += strlen(t);
if (p == IPPROTO_TCP) {
*t++ = '-';
for (i = 0; tcpfl[i].value; i++)
if (tp->th_flags & tcpfl[i].value)
*t++ = tcpfl[i].flag;
}
*t = '\0';
} else {
(void) sprintf(t, "%s -> ", hostname(res, ip->ip_src));
t += strlen(t);
(void) sprintf(t, "%s PR %s len %hu %hu",
hostname(res, ip->ip_dst), proto,
hl, ip->ip_len);
}
} else if (p == IPPROTO_ICMP) {
ic = (struct icmp *)((char *)ip + hl);
(void) sprintf(t, "%s -> ", hostname(res, ip->ip_src));
t += strlen(t);
(void) sprintf(t, "%s PR icmp len %hu (%hu) icmp %d/%d",
hostname(res, ip->ip_dst), hl,
ip->ip_len, ic->icmp_type, ic->icmp_code);
if (ic->icmp_type == ICMP_UNREACH ||
ic->icmp_type == ICMP_SOURCEQUENCH ||
ic->icmp_type == ICMP_PARAMPROB ||
ic->icmp_type == ICMP_REDIRECT ||
ic->icmp_type == ICMP_TIMXCEED) {
ipc = &ic->icmp_ip;
tp = (struct tcphdr *)((char *)ipc + hl);
p = (u_short)ipc->ip_p;
pr = getprotobynumber((int)p);
if (!pr) {
proto = pname;
(void) sprintf(proto, "%d", (int)p);
} else
proto = pr->p_name;
t += strlen(t);
(void) sprintf(t, " for %s,%s -",
hostname(res, ipc->ip_src),
portname(res, proto, tp->th_sport));
t += strlen(t);
(void) sprintf(t, " %s,%s PR %s len %hu %hu",
hostname(res, ipc->ip_dst),
portname(res, proto, tp->th_dport),
proto, ipc->ip_hl << 2, ipc->ip_len);
}
} else {
(void) sprintf(t, "%s -> ", hostname(res, ip->ip_src));
t += strlen(t);
(void) sprintf(t, "%s PR %s len %hu (%hu)",
hostname(res, ip->ip_dst), proto, hl, ip->ip_len);
t += strlen(t);
if (ip->ip_off & 0x1fff)
(void) sprintf(t, " frag %s%s%hu@%hu",
ip->ip_off & IP_MF ? "+" : "",
ip->ip_off & IP_DF ? "-" : "",
ip->ip_len - hl, (ip->ip_off & 0x1fff) << 3);
}
t += strlen(t);
*t++ = '\n';
*t++ = '\0';
if (opts & 1)
syslog(lvl, "%s", line);
else
(void) fprintf(log, "%s", line);
fflush(log);
}
main(argc, argv)
int argc;
char *argv[];
{
FILE *log;
int fd, flushed = 0, opts = 0;
char buf[512], c;
struct ipl_ci iplci;
extern int optind;
if ((fd = open(IPL_NAME, O_RDONLY)) == -1) {
(void) fprintf(stderr, "%s: ", IPL_NAME);
perror("open");
exit(-1);
}
while ((c = getopt(argc, argv, "Nfs")) != -1)
switch (c)
{
case 'f' :
if (ioctl(fd, SIOCIPFFB, &flushed) == 0) {
printf("%d bytes flushed from log buffer\n",
flushed);
fflush(stdout);
}
break;
case 'N' :
opts |= 2;
break;
case 's' :
openlog(argv[0], LOG_NDELAY|LOG_PID, LOGFAC);
opts |= 1;
break;
}
log = argv[optind] ? fopen(argv[1], "a") : stdout;
setvbuf(log, NULL, _IONBF, 0);
if (flushed)
fprintf(log, "%d bytes flushed from log\n", flushed);
while (1) {
assert(read(fd, &iplci, sizeof(struct ipl_ci)) ==
sizeof(struct ipl_ci));
assert(iplci.hlen > 0 && iplci.hlen <= 92);
assert((u_char)iplci.plen <= 128);
assert(read(fd, buf, iplci.hlen + iplci.plen) ==
(iplci.hlen + iplci.plen));
printpacket(log, buf, &iplci, opts);
}
return 0;
}
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