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freebsd-skq/contrib/ipfilter/ipmon.c
Darren Reed 7d2bc5ce77 fix conflicts created by import
2001-07-28 12:08:15 +00:00

1283 lines
26 KiB
C
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/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*/
#ifndef SOLARIS
#define SOLARIS (defined(__SVR4) || defined(__svr4__)) && defined(sun)
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#if !defined(__SVR4) && !defined(__svr4__)
# if (__FreeBSD_version >= 300000)
# include <sys/dirent.h>
# else
# include <sys/dir.h>
# endif
#else
# include <sys/filio.h>
# include <sys/byteorder.h>
#endif
#if !defined(__SVR4) && !defined(__GNUC__)
# include <strings.h>
#endif
#include <signal.h>
#include <stdlib.h>
#include <stddef.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <net/if.h>
#include <netinet/ip.h>
#include <netinet/tcp_fsm.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <sys/uio.h>
#ifndef linux
# include <sys/protosw.h>
# include <netinet/ip_var.h>
#endif
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <ctype.h>
#include <syslog.h>
#include "netinet/ip_compat.h"
#include <netinet/tcpip.h>
#include "netinet/ip_fil.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_nat.h"
#include "netinet/ip_state.h"
#if !defined(lint)
static const char sccsid[] = "@(#)ipmon.c 1.21 6/5/96 (C)1993-2000 Darren Reed";
/* static const char rcsid[] = "@(#)$Id: ipmon.c,v 2.12.2.13 2001/07/19 12:24:59 darrenr Exp $"; */
static const char rcsid[] = "@(#)$FreeBSD$";
#endif
#if defined(sun) && !defined(SOLARIS2)
#define STRERROR(x) sys_errlist[x]
extern char *sys_errlist[];
#else
#define STRERROR(x) strerror(x)
#endif
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' },
{ TH_ECN, 'E' },
{ TH_CWR, 'C' },
{ 0, '\0' }
};
#if SOLARIS
static char *pidfile = "/etc/opt/ipf/ipmon.pid";
#else
# if BSD >= 199306
static char *pidfile = "/var/run/ipmon.pid";
# else
static char *pidfile = "/etc/ipmon.pid";
# endif
#endif
static char line[2048];
static int opts = 0;
static FILE *newlog = NULL;
static char *logfile = NULL;
static int donehup = 0;
static void usage __P((char *));
static void handlehup __P((int));
static void flushlogs __P((char *, FILE *));
static void print_log __P((int, FILE *, char *, int));
static void print_ipflog __P((FILE *, char *, int));
static void print_natlog __P((FILE *, char *, int));
static void print_statelog __P((FILE *, char *, int));
static void dumphex __P((FILE *, u_char *, int));
static int read_log __P((int, int *, char *, int));
static void write_pid __P((char *));
static char *icmpname __P((u_int, u_int));
char *hostname __P((int, int, u_32_t *));
char *portname __P((int, char *, u_int));
int main __P((int, char *[]));
static void logopts __P((int, char *));
static void init_tabs __P((void));
static char *getproto __P((u_int));
static char **protocols = NULL;
static char **udp_ports = NULL;
static char **tcp_ports = NULL;
static char *argv0 = "ipmon";
#define OPT_SYSLOG 0x001
#define OPT_RESOLVE 0x002
#define OPT_HEXBODY 0x004
#define OPT_VERBOSE 0x008
#define OPT_HEXHDR 0x010
#define OPT_TAIL 0x020
#define OPT_NAT 0x080
#define OPT_STATE 0x100
#define OPT_FILTER 0x200
#define OPT_PORTNUM 0x400
#define OPT_LOGALL (OPT_NAT|OPT_STATE|OPT_FILTER)
#define OPT_LOGBODY 0x800
#define HOSTNAME_V4(a,b) hostname((a), 4, (u_32_t *)&(b))
#ifndef LOGFAC
#define LOGFAC LOG_LOCAL0
#endif
#define ICMPUNREACHNAMES 14
static char *icmpunreachnames[ICMPUNREACHNAMES] = {
"net",
"host",
"protocol",
"port",
"needfrag",
"srcfail",
"net_unknown",
"host_unknown",
"isolated",
"net_prohib",
"host_prohib",
"tosnet",
"toshost",
"admin_prohibit"
};
#define ICMPTYPES 19
static char *icmptypes[ICMPTYPES] = {
"echoreply",
NULL,
NULL,
"unreach",
"sourcequench",
"redirect",
NULL,
NULL,
"echo",
"routeradvert",
"routersolicit",
"timxceed",
"paramprob",
"timestamp",
"timestampreply",
"inforeq",
"inforeply",
"maskreq",
"maskreply"
};
static void handlehup(sig)
int sig;
{
FILE *fp;
signal(SIGHUP, handlehup);
if (logfile && (fp = fopen(logfile, "a")))
newlog = fp;
init_tabs();
donehup = 1;
}
static void init_tabs()
{
struct protoent *p;
struct servent *s;
char *name, **tab;
int port;
if (protocols != NULL) {
free(protocols);
protocols = NULL;
}
protocols = (char **)malloc(256 * sizeof(*protocols));
if (protocols != NULL) {
bzero((char *)protocols, 256 * sizeof(*protocols));
setprotoent(1);
while ((p = getprotoent()) != NULL)
if (p->p_proto >= 0 && p->p_proto <= 255 &&
p->p_name != NULL)
protocols[p->p_proto] = strdup(p->p_name);
endprotoent();
}
if (udp_ports != NULL) {
free(udp_ports);
udp_ports = NULL;
}
udp_ports = (char **)malloc(65536 * sizeof(*udp_ports));
if (udp_ports != NULL)
bzero((char *)udp_ports, 65536 * sizeof(*udp_ports));
if (tcp_ports != NULL) {
free(tcp_ports);
tcp_ports = NULL;
}
tcp_ports = (char **)malloc(65536 * sizeof(*tcp_ports));
if (tcp_ports != NULL)
bzero((char *)tcp_ports, 65536 * sizeof(*tcp_ports));
setservent(1);
while ((s = getservent()) != NULL) {
if (s->s_proto == NULL)
continue;
else if (!strcmp(s->s_proto, "tcp")) {
port = ntohs(s->s_port);
name = s->s_name;
tab = tcp_ports;
} else if (!strcmp(s->s_proto, "udp")) {
port = ntohs(s->s_port);
name = s->s_name;
tab = udp_ports;
} else
continue;
if ((port < 0 || port > 65535) || (name == NULL))
continue;
tab[port] = strdup(name);
}
endservent();
}
static char *getproto(p)
u_int p;
{
static char pnum[4];
char *s;
p &= 0xff;
s = protocols ? protocols[p] : NULL;
if (s == NULL) {
sprintf(pnum, "%u", p);
s = pnum;
}
return s;
}
static int read_log(fd, lenp, buf, bufsize)
int fd, bufsize, *lenp;
char *buf;
{
int nr;
nr = read(fd, buf, bufsize);
if (!nr)
return 2;
if ((nr < 0) && (errno != EINTR))
return -1;
*lenp = nr;
return 0;
}
char *hostname(res, v, ip)
int res, v;
u_32_t *ip;
{
# define MAX_INETA 16
static char hname[MAXHOSTNAMELEN + MAX_INETA + 3];
#ifdef USE_INET6
static char hostbuf[MAXHOSTNAMELEN+1];
#endif
struct hostent *hp;
struct in_addr ipa;
if (v == 4) {
ipa.s_addr = *ip;
if (!res)
return inet_ntoa(ipa);
hp = gethostbyaddr((char *)ip, sizeof(ip), AF_INET);
if (!hp)
return inet_ntoa(ipa);
sprintf(hname, "%.*s[%s]", MAXHOSTNAMELEN, hp->h_name, inet_ntoa(ipa));
return hname;
}
#ifdef USE_INET6
(void) inet_ntop(AF_INET6, ip, hostbuf, sizeof(hostbuf) - 1);
hostbuf[MAXHOSTNAMELEN] = '\0';
return hostbuf;
#else
return "IPv6";
#endif
}
char *portname(res, proto, port)
int res;
char *proto;
u_int port;
{
static char pname[8];
char *s;
port = ntohs(port);
port &= 0xffff;
(void) sprintf(pname, "%u", port);
if (!res || (opts & OPT_PORTNUM))
return pname;
s = NULL;
if (!strcmp(proto, "tcp"))
s = tcp_ports[port];
else if (!strcmp(proto, "udp"))
s = udp_ports[port];
if (s == NULL)
s = pname;
return s;
}
#define TYPECODE(x,y) (((x) << 8) | (y))
static char *icmpname(type, code)
u_int type;
u_int code;
{
static char name[80];
char codeval[8], *s;
u_int typecode;
sprintf(codeval, "%d", code);
s = NULL;
if (type < ICMPTYPES)
s = icmptypes[type];
if (s == NULL)
sprintf(name, "icmptype(%d)/", type);
else
sprintf(name, "%s/", s);
if (type == ICMP_UNREACH) {
if (code >= ICMPUNREACHNAMES)
sprintf(name + strlen(name), "%d", code);
else
strcat(name, icmpunreachnames[code]);
} else {
typecode = (type << 8) | code;
switch (typecode)
{
case TYPECODE(ICMP_REDIRECT, ICMP_REDIRECT_NET) :
strcat(name, "net");
break;
case TYPECODE(ICMP_REDIRECT, ICMP_REDIRECT_HOST) :
strcat(name, "host");
break;
case TYPECODE(ICMP_REDIRECT, ICMP_REDIRECT_TOSNET) :
strcat(name, "tosnet");
break;
case TYPECODE(ICMP_REDIRECT, ICMP_REDIRECT_TOSHOST) :
strcat(name, "toshost");
break;
case TYPECODE(ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS) :
strcat(name, "intrans");
break;
case TYPECODE(ICMP_TIMXCEED, ICMP_TIMXCEED_REASS) :
strcat(name, "reass");
break;
case TYPECODE(ICMP_PARAMPROB, ICMP_PARAMPROB_OPTABSENT) :
strcat(name, "optabsent");
break;
default:
strcat(name, codeval);
break;
}
}
return name;
}
static void dumphex(log, buf, len)
FILE *log;
u_char *buf;
int len;
{
char line[80];
int i, j, k;
u_char *s = buf, *t = (u_char *)line;
for (i = len, j = 0; i; i--, j++, s++) {
if (j && !(j & 0xf)) {
*t++ = '\n';
*t = '\0';
if (!(opts & OPT_SYSLOG))
fputs(line, log);
else
syslog(LOG_INFO, "%s", line);
t = (u_char *)line;
*t = '\0';
}
sprintf((char *)t, "%02x", *s & 0xff);
t += 2;
if (!((j + 1) & 0xf)) {
s -= 15;
sprintf((char *)t, " ");
t += 8;
for (k = 16; k; k--, s++)
*t++ = (isprint(*s) ? *s : '.');
s--;
}
if ((j + 1) & 0xf)
*t++ = ' ';;
}
if (j & 0xf) {
for (k = 16 - (j & 0xf); k; k--) {
*t++ = ' ';
*t++ = ' ';
*t++ = ' ';
}
sprintf((char *)t, " ");
t += 7;
s -= j & 0xf;
for (k = j & 0xf; k; k--, s++)
*t++ = (isprint(*s) ? *s : '.');
*t++ = '\n';
*t = '\0';
}
if (!(opts & OPT_SYSLOG)) {
fputs(line, log);
fflush(log);
} else
syslog(LOG_INFO, "%s", line);
}
static void print_natlog(log, buf, blen)
FILE *log;
char *buf;
int blen;
{
struct natlog *nl;
iplog_t *ipl = (iplog_t *)buf;
char *t = line;
struct tm *tm;
int res, i, len;
char *proto;
nl = (struct natlog *)((char *)ipl + sizeof(*ipl));
res = (opts & OPT_RESOLVE) ? 1 : 0;
tm = localtime((time_t *)&ipl->ipl_sec);
len = sizeof(line);
if (!(opts & OPT_SYSLOG)) {
(void) strftime(t, len, "%d/%m/%Y ", tm);
i = strlen(t);
len -= i;
t += i;
}
(void) strftime(t, len, "%T", tm);
t += strlen(t);
(void) sprintf(t, ".%-.6ld @%hd ", ipl->ipl_usec, nl->nl_rule + 1);
t += strlen(t);
if (nl->nl_type == NL_NEWMAP)
strcpy(t, "NAT:MAP ");
else if (nl->nl_type == NL_NEWRDR)
strcpy(t, "NAT:RDR ");
else if (nl->nl_type == NL_EXPIRE)
strcpy(t, "NAT:EXPIRE ");
else if (nl->nl_type == NL_FLUSH)
strcpy(t, "NAT:FLUSH ");
else if (nl->nl_type == NL_NEWBIMAP)
strcpy(t, "NAT:BIMAP ");
else if (nl->nl_type == NL_NEWBLOCK)
strcpy(t, "NAT:MAPBLOCK ");
else
sprintf(t, "Type: %d ", nl->nl_type);
t += strlen(t);
proto = getproto(nl->nl_p);
(void) sprintf(t, "%s,%s <- -> ", HOSTNAME_V4(res, nl->nl_inip),
portname(res, proto, (u_int)nl->nl_inport));
t += strlen(t);
(void) sprintf(t, "%s,%s ", HOSTNAME_V4(res, nl->nl_outip),
portname(res, proto, (u_int)nl->nl_outport));
t += strlen(t);
(void) sprintf(t, "[%s,%s]", HOSTNAME_V4(res, nl->nl_origip),
portname(res, proto, (u_int)nl->nl_origport));
t += strlen(t);
if (nl->nl_type == NL_EXPIRE) {
#ifdef USE_QUAD_T
(void) sprintf(t, " Pkts %qd Bytes %qd",
(long long)nl->nl_pkts,
(long long)nl->nl_bytes);
#else
(void) sprintf(t, " Pkts %ld Bytes %ld",
nl->nl_pkts, nl->nl_bytes);
#endif
t += strlen(t);
}
*t++ = '\n';
*t++ = '\0';
if (opts & OPT_SYSLOG)
syslog(LOG_INFO, "%s", line);
else
(void) fprintf(log, "%s", line);
}
static void print_statelog(log, buf, blen)
FILE *log;
char *buf;
int blen;
{
struct ipslog *sl;
iplog_t *ipl = (iplog_t *)buf;
char *t = line, *proto;
struct tm *tm;
int res, i, len;
sl = (struct ipslog *)((char *)ipl + sizeof(*ipl));
res = (opts & OPT_RESOLVE) ? 1 : 0;
tm = localtime((time_t *)&ipl->ipl_sec);
len = sizeof(line);
if (!(opts & OPT_SYSLOG)) {
(void) strftime(t, len, "%d/%m/%Y ", tm);
i = strlen(t);
len -= i;
t += i;
}
(void) strftime(t, len, "%T", tm);
t += strlen(t);
(void) sprintf(t, ".%-.6ld ", ipl->ipl_usec);
t += strlen(t);
if (sl->isl_type == ISL_NEW)
strcpy(t, "STATE:NEW ");
else if (sl->isl_type == ISL_EXPIRE) {
if ((sl->isl_p == IPPROTO_TCP) &&
(sl->isl_state[0] > TCPS_ESTABLISHED ||
sl->isl_state[1] > TCPS_ESTABLISHED))
strcpy(t, "STATE:CLOSE ");
else
strcpy(t, "STATE:EXPIRE ");
} else if (sl->isl_type == ISL_FLUSH)
strcpy(t, "STATE:FLUSH ");
else if (sl->isl_type == ISL_REMOVE)
strcpy(t, "STATE:REMOVE ");
else
sprintf(t, "Type: %d ", sl->isl_type);
t += strlen(t);
proto = getproto(sl->isl_p);
if (sl->isl_p == IPPROTO_TCP || sl->isl_p == IPPROTO_UDP) {
(void) sprintf(t, "%s,%s -> ",
hostname(res, sl->isl_v, (u_32_t *)&sl->isl_src),
portname(res, proto, (u_int)sl->isl_sport));
t += strlen(t);
(void) sprintf(t, "%s,%s PR %s",
hostname(res, sl->isl_v, (u_32_t *)&sl->isl_dst),
portname(res, proto, (u_int)sl->isl_dport), proto);
} else if (sl->isl_p == IPPROTO_ICMP) {
(void) sprintf(t, "%s -> ", hostname(res, sl->isl_v,
(u_32_t *)&sl->isl_src));
t += strlen(t);
(void) sprintf(t, "%s PR icmp %d",
hostname(res, sl->isl_v, (u_32_t *)&sl->isl_dst),
sl->isl_itype);
}
t += strlen(t);
if (sl->isl_type != ISL_NEW) {
#ifdef USE_QUAD_T
(void) sprintf(t, " Pkts %qd Bytes %qd",
(long long)sl->isl_pkts,
(long long)sl->isl_bytes);
#else
(void) sprintf(t, " Pkts %ld Bytes %ld",
sl->isl_pkts, sl->isl_bytes);
#endif
t += strlen(t);
}
*t++ = '\n';
*t++ = '\0';
if (opts & OPT_SYSLOG)
syslog(LOG_INFO, "%s", line);
else
(void) fprintf(log, "%s", line);
}
static void print_log(logtype, log, buf, blen)
FILE *log;
char *buf;
int logtype, blen;
{
iplog_t *ipl;
char *bp = NULL, *bpo = NULL;
int psize;
while (blen > 0) {
ipl = (iplog_t *)buf;
if ((u_long)ipl & (sizeof(long)-1)) {
if (bp)
bpo = bp;
bp = (char *)malloc(blen);
bcopy((char *)ipl, bp, blen);
if (bpo) {
free(bpo);
bpo = NULL;
}
buf = bp;
continue;
}
if (ipl->ipl_magic != IPL_MAGIC) {
/* invalid data or out of sync */
break;
}
psize = ipl->ipl_dsize;
switch (logtype)
{
case IPL_LOGIPF :
print_ipflog(log, buf, psize);
break;
case IPL_LOGNAT :
print_natlog(log, buf, psize);
break;
case IPL_LOGSTATE :
print_statelog(log, buf, psize);
break;
}
blen -= psize;
buf += psize;
}
if (bp)
free(bp);
return;
}
static void print_ipflog(log, buf, blen)
FILE *log;
char *buf;
int blen;
{
tcphdr_t *tp;
struct icmp *ic;
struct icmp *icmp;
struct tm *tm;
char *t, *proto;
int i, v, lvl, res, len, off, plen, ipoff;
ip_t *ipc, *ip;
u_short hl, p;
ipflog_t *ipf;
iplog_t *ipl;
u_32_t *s, *d;
#ifdef USE_INET6
ip6_t *ip6;
#endif
ipl = (iplog_t *)buf;
ipf = (ipflog_t *)((char *)buf + sizeof(*ipl));
ip = (ip_t *)((char *)ipf + sizeof(*ipf));
v = ip->ip_v;
res = (opts & OPT_RESOLVE) ? 1 : 0;
t = line;
*t = '\0';
tm = localtime((time_t *)&ipl->ipl_sec);
#ifdef linux
if (v == 4)
ip->ip_len = ntohs(ip->ip_len);
#endif
len = sizeof(line);
if (!(opts & OPT_SYSLOG)) {
(void) strftime(t, len, "%d/%m/%Y ", tm);
i = strlen(t);
len -= i;
t += i;
}
(void) strftime(t, len, "%T", tm);
t += strlen(t);
(void) sprintf(t, ".%-.6ld ", ipl->ipl_usec);
t += strlen(t);
if (ipl->ipl_count > 1) {
(void) sprintf(t, "%dx ", ipl->ipl_count);
t += strlen(t);
}
#if (SOLARIS || \
(defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
(defined(OpenBSD) && (OpenBSD >= 199603))) || defined(linux)
len = (int)sizeof(ipf->fl_ifname);
(void) sprintf(t, "%*.*s", len, len, ipf->fl_ifname);
t += strlen(t);
# if SOLARIS
if (isalpha(*(t - 1)))
*t++ = '0' + ipf->fl_unit;
# endif
#else
for (len = 0; len < 3; len++)
if (ipf->fl_ifname[len] == '\0')
break;
if (ipf->fl_ifname[len])
len++;
(void) sprintf(t, "%*.*s%u", len, len, ipf->fl_ifname, ipf->fl_unit);
t += strlen(t);
#endif
(void) sprintf(t, " @%hu:%hu ", ipf->fl_group, ipf->fl_rule + 1);
t += strlen(t);
if (ipf->fl_flags & FF_SHORT) {
*t++ = 'S';
lvl = LOG_ERR;
} else if (ipf->fl_flags & FR_PASS) {
if (ipf->fl_flags & FR_LOGP)
*t++ = 'p';
else
*t++ = 'P';
lvl = LOG_NOTICE;
} else if (ipf->fl_flags & FR_BLOCK) {
if (ipf->fl_flags & FR_LOGB)
*t++ = 'b';
else
*t++ = 'B';
lvl = LOG_WARNING;
} else if (ipf->fl_flags & FF_LOGNOMATCH) {
*t++ = 'n';
lvl = LOG_NOTICE;
} else {
*t++ = 'L';
lvl = LOG_INFO;
}
if (ipf->fl_loglevel != 0xffff)
lvl = ipf->fl_loglevel;
*t++ = ' ';
*t = '\0';
if (v == 6) {
#ifdef USE_INET6
off = 0;
ipoff = 0;
hl = sizeof(ip6_t);
ip6 = (ip6_t *)ip;
p = (u_short)ip6->ip6_nxt;
s = (u_32_t *)&ip6->ip6_src;
d = (u_32_t *)&ip6->ip6_dst;
plen = ntohs(ip6->ip6_plen);
#else
sprintf(t, "ipv6");
goto printipflog;
#endif
} else if (v == 4) {
hl = (ip->ip_hl << 2);
ipoff = ip->ip_off;
off = ipoff & IP_OFFMASK;
p = (u_short)ip->ip_p;
s = (u_32_t *)&ip->ip_src;
d = (u_32_t *)&ip->ip_dst;
plen = ip->ip_len;
} else {
goto printipflog;
}
proto = getproto(p);
if ((p == IPPROTO_TCP || p == IPPROTO_UDP) && !off) {
tp = (tcphdr_t *)((char *)ip + hl);
if (!(ipf->fl_flags & (FI_SHORT << 16))) {
(void) sprintf(t, "%s,%s -> ", hostname(res, v, s),
portname(res, proto, (u_int)tp->th_sport));
t += strlen(t);
(void) sprintf(t, "%s,%s PR %s len %hu %hu ",
hostname(res, v, d),
portname(res, proto, (u_int)tp->th_dport),
proto, hl, plen);
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;
if (opts & OPT_VERBOSE) {
(void) sprintf(t, " %lu %lu %hu",
(u_long)(ntohl(tp->th_seq)),
(u_long)(ntohl(tp->th_ack)),
ntohs(tp->th_win));
t += strlen(t);
}
}
*t = '\0';
} else {
(void) sprintf(t, "%s -> ", hostname(res, v, s));
t += strlen(t);
(void) sprintf(t, "%s PR %s len %hu %hu",
hostname(res, v, d), proto, hl, plen);
}
} else if ((p == IPPROTO_ICMP) && !off && (v == 4)) {
ic = (struct icmp *)((char *)ip + hl);
(void) sprintf(t, "%s -> ", hostname(res, v, s));
t += strlen(t);
(void) sprintf(t, "%s PR icmp len %hu %hu icmp %s",
hostname(res, v, d), hl, plen,
icmpname((u_int) ic->icmp_type, (u_int) 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;
i = ntohs(ipc->ip_len);
ipoff = ntohs(ipc->ip_off);
proto = getproto(ipc->ip_p);
if (!(ipoff & IP_OFFMASK) &&
((ipc->ip_p == IPPROTO_TCP) ||
(ipc->ip_p == IPPROTO_UDP))) {
tp = (tcphdr_t *)((char *)ipc + hl);
t += strlen(t);
(void) sprintf(t, " for %s,%s -",
HOSTNAME_V4(res, ipc->ip_src),
portname(res, proto,
(u_int)tp->th_sport));
t += strlen(t);
(void) sprintf(t, " %s,%s PR %s len %hu %hu",
HOSTNAME_V4(res, ipc->ip_dst),
portname(res, proto,
(u_int)tp->th_dport),
proto, ipc->ip_hl << 2, i);
} else if (!(ipoff & IP_OFFMASK) &&
(ipc->ip_p == IPPROTO_ICMP)) {
icmp = (icmphdr_t *)((char *)ipc + hl);
t += strlen(t);
(void) sprintf(t, " for %s -",
HOSTNAME_V4(res, ipc->ip_src));
t += strlen(t);
(void) sprintf(t,
" %s PR icmp len %hu %hu icmp %d/%d",
HOSTNAME_V4(res, ipc->ip_dst),
ipc->ip_hl << 2, i,
icmp->icmp_type, icmp->icmp_code);
} else {
t += strlen(t);
(void) sprintf(t, " for %s -",
HOSTNAME_V4(res, ipc->ip_src));
t += strlen(t);
(void) sprintf(t, " %s PR %s len %hu (%hu)",
HOSTNAME_V4(res, ipc->ip_dst), proto,
ipc->ip_hl << 2, i);
t += strlen(t);
if (ipoff & IP_OFFMASK) {
(void) sprintf(t, " frag %s%s%hu@%hu",
ipoff & IP_MF ? "+" : "",
ipoff & IP_DF ? "-" : "",
i - (ipc->ip_hl<<2),
(ipoff & IP_OFFMASK) << 3);
}
}
}
} else {
(void) sprintf(t, "%s -> ", hostname(res, v, s));
t += strlen(t);
(void) sprintf(t, "%s PR %s len %hu (%hu)",
hostname(res, v, d), proto, hl, plen);
t += strlen(t);
if (off & IP_OFFMASK)
(void) sprintf(t, " frag %s%s%hu@%hu",
ipoff & IP_MF ? "+" : "",
ipoff & IP_DF ? "-" : "",
plen - hl, (off & IP_OFFMASK) << 3);
}
t += strlen(t);
if (ipf->fl_flags & FR_KEEPSTATE) {
(void) strcpy(t, " K-S");
t += strlen(t);
}
if (ipf->fl_flags & FR_KEEPFRAG) {
(void) strcpy(t, " K-F");
t += strlen(t);
}
if (ipf->fl_flags & FR_INQUE)
strcpy(t, " IN");
else if (ipf->fl_flags & FR_OUTQUE)
strcpy(t, " OUT");
t += strlen(t);
printipflog:
*t++ = '\n';
*t++ = '\0';
if (opts & OPT_SYSLOG)
syslog(lvl, "%s", line);
else
(void) fprintf(log, "%s", line);
if (opts & OPT_HEXHDR)
dumphex(log, (u_char *)buf, sizeof(iplog_t) + sizeof(*ipf));
if (opts & OPT_HEXBODY)
dumphex(log, (u_char *)ip, ipf->fl_plen + ipf->fl_hlen);
else if ((opts & OPT_LOGBODY) && (ipf->fl_flags & FR_LOGBODY))
dumphex(log, (u_char *)ip + ipf->fl_hlen, ipf->fl_plen);
}
static void usage(prog)
char *prog;
{
fprintf(stderr, "%s: [-NFhstvxX] [-f <logfile>]\n", prog);
exit(1);
}
static void write_pid(file)
char *file;
{
FILE *fp = NULL;
int fd;
if ((fd = open(file, O_CREAT|O_TRUNC|O_WRONLY, 0644)) >= 0)
fp = fdopen(fd, "w");
if (!fp) {
close(fd);
fprintf(stderr, "unable to open/create pid file: %s\n", file);
return;
}
fprintf(fp, "%d", getpid());
fclose(fp);
close(fd);
}
static void flushlogs(file, log)
char *file;
FILE *log;
{
int fd, flushed = 0;
if ((fd = open(file, O_RDWR)) == -1) {
(void) fprintf(stderr, "%s: open: %s\n", file,STRERROR(errno));
exit(1);
}
if (ioctl(fd, SIOCIPFFB, &flushed) == 0) {
printf("%d bytes flushed from log buffer\n",
flushed);
fflush(stdout);
} else
perror("SIOCIPFFB");
(void) close(fd);
if (flushed) {
if (opts & OPT_SYSLOG)
syslog(LOG_INFO, "%d bytes flushed from log\n",
flushed);
else if (log != stdout)
fprintf(log, "%d bytes flushed from log\n", flushed);
}
}
static void logopts(turnon, options)
int turnon;
char *options;
{
int flags = 0;
char *s;
for (s = options; *s; s++)
{
switch (*s)
{
case 'N' :
flags |= OPT_NAT;
break;
case 'S' :
flags |= OPT_STATE;
break;
case 'I' :
flags |= OPT_FILTER;
break;
default :
fprintf(stderr, "Unknown log option %c\n", *s);
exit(1);
}
}
if (turnon)
opts |= flags;
else
opts &= ~(flags);
}
int main(argc, argv)
int argc;
char *argv[];
{
struct stat sb;
FILE *log = stdout;
int fd[3], doread, n, i;
int tr, nr, regular[3], c;
int fdt[3], devices = 0, make_daemon = 0;
char buf[512], *iplfile[3];
extern int optind;
extern char *optarg;
fd[0] = fd[1] = fd[2] = -1;
fdt[0] = fdt[1] = fdt[2] = -1;
iplfile[0] = IPL_NAME;
iplfile[1] = IPNAT_NAME;
iplfile[2] = IPSTATE_NAME;
argv0 = strrchr(argv[0], '/');
if (argv0 == NULL)
argv0 = argv[0];
else
argv0++;
while ((c = getopt(argc, argv, "?abDf:FhnN:o:O:pP:sS:tvxX")) != -1)
switch (c)
{
case 'a' :
opts |= OPT_LOGALL;
fdt[0] = IPL_LOGIPF;
fdt[1] = IPL_LOGNAT;
fdt[2] = IPL_LOGSTATE;
break;
case 'b' :
opts |= OPT_LOGBODY;
break;
case 'D' :
make_daemon = 1;
break;
case 'f' : case 'I' :
opts |= OPT_FILTER;
fdt[0] = IPL_LOGIPF;
iplfile[0] = optarg;
break;
case 'F' :
flushlogs(iplfile[0], log);
flushlogs(iplfile[1], log);
flushlogs(iplfile[2], log);
break;
case 'n' :
opts |= OPT_RESOLVE;
break;
case 'N' :
opts |= OPT_NAT;
fdt[1] = IPL_LOGNAT;
iplfile[1] = optarg;
break;
case 'o' : case 'O' :
logopts(c == 'o', optarg);
fdt[0] = fdt[1] = fdt[2] = -1;
if (opts & OPT_FILTER)
fdt[0] = IPL_LOGIPF;
if (opts & OPT_NAT)
fdt[1] = IPL_LOGNAT;
if (opts & OPT_STATE)
fdt[2] = IPL_LOGSTATE;
break;
case 'p' :
opts |= OPT_PORTNUM;
break;
case 'P' :
pidfile = optarg;
break;
case 's' :
openlog(argv0, LOG_NDELAY|LOG_PID, LOGFAC);
opts |= OPT_SYSLOG;
log = NULL;
break;
case 'S' :
opts |= OPT_STATE;
fdt[2] = IPL_LOGSTATE;
iplfile[2] = optarg;
break;
case 't' :
opts |= OPT_TAIL;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
case 'x' :
opts |= OPT_HEXBODY;
break;
case 'X' :
opts |= OPT_HEXHDR;
break;
default :
case 'h' :
case '?' :
usage(argv0);
}
init_tabs();
/*
* Default action is to only open the filter log file.
*/
if ((fdt[0] == -1) && (fdt[1] == -1) && (fdt[2] == -1))
fdt[0] = IPL_LOGIPF;
for (i = 0; i < 3; i++) {
if (fdt[i] == -1)
continue;
if (!strcmp(iplfile[i], "-"))
fd[i] = 0;
else {
if ((fd[i] = open(iplfile[i], O_RDONLY)) == -1) {
(void) fprintf(stderr,
"%s: open: %s\n", iplfile[i],
STRERROR(errno));
exit(1);
/* NOTREACHED */
}
if (fstat(fd[i], &sb) == -1) {
(void) fprintf(stderr, "%d: fstat: %s\n",fd[i],
STRERROR(errno));
exit(1);
/* NOTREACHED */
}
if (!(regular[i] = !S_ISCHR(sb.st_mode)))
devices++;
}
}
if (!(opts & OPT_SYSLOG)) {
logfile = argv[optind];
log = logfile ? fopen(logfile, "a") : stdout;
if (log == NULL) {
(void) fprintf(stderr, "%s: fopen: %s\n", argv[optind],
STRERROR(errno));
exit(1);
/* NOTREACHED */
}
setvbuf(log, NULL, _IONBF, 0);
} else
log = NULL;
if (make_daemon && ((log != stdout) || (opts & OPT_SYSLOG))) {
#if BSD
daemon(0, !(opts & OPT_SYSLOG));
#else
int pid;
if ((pid = fork()) > 0)
exit(0);
if (pid < 0) {
(void) fprintf(stderr, "%s: fork() failed: %s\n", argv0,
STRERROR(errno));
exit(1);
/* NOTREACHED */
}
setsid();
if ((opts & OPT_SYSLOG))
close(2);
#endif /* !BSD */
close(0);
close(1);
}
write_pid(pidfile);
signal(SIGHUP, handlehup);
for (doread = 1; doread; ) {
nr = 0;
for (i = 0; i < 3; i++) {
tr = 0;
if (fdt[i] == -1)
continue;
if (!regular[i]) {
if (ioctl(fd[i], FIONREAD, &tr) == -1) {
if (opts & OPT_SYSLOG)
syslog(LOG_CRIT, "ioctl(FIONREAD): %m");
else
perror("ioctl(FIONREAD)");
exit(1);
/* NOTREACHED */
}
} else {
tr = (lseek(fd[i], 0, SEEK_CUR) < sb.st_size);
if (!tr && !(opts & OPT_TAIL))
doread = 0;
}
if (!tr)
continue;
nr += tr;
tr = read_log(fd[i], &n, buf, sizeof(buf));
if (donehup) {
donehup = 0;
if (newlog) {
fclose(log);
log = newlog;
newlog = NULL;
}
}
switch (tr)
{
case -1 :
if (opts & OPT_SYSLOG)
syslog(LOG_CRIT, "read: %m\n");
else
perror("read");
doread = 0;
break;
case 1 :
if (opts & OPT_SYSLOG)
syslog(LOG_CRIT, "aborting logging\n");
else
fprintf(log, "aborting logging\n");
doread = 0;
break;
case 2 :
break;
case 0 :
if (n > 0) {
print_log(fdt[i], log, buf, n);
if (!(opts & OPT_SYSLOG))
fflush(log);
}
break;
}
}
if (!nr && ((opts & OPT_TAIL) || devices))
sleep(1);
}
exit(0);
/* NOTREACHED */
}
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