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/* ulogd_LOGEMU.c, Version $Revision: 1.3 $
*
* ulogd output target for syslog logging emulation
*
* This target produces a file which looks the same like the syslog-entries
* of the LOG target.
*
* (C) 2000 by Harald Welte <laforge@gnumonks.org>
* This software is released under the terms of GNU GPL
*
* $Id: ulogd_LOGEMU.c,v 1.3 2001/02/04 13:39:31 laforge Exp $
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include "ulogd.h"
#include "conffile.h"
#ifndef ULOGD_LOGEMU_DEFAULT
#define ULOGD_LOGEMU_DEFAULT "/var/log/ulogd.syslogemu"
#endif
#define NIPQUAD(addr) \
((unsigned char *)&addr)[0], \
((unsigned char *)&addr)[1], \
((unsigned char *)&addr)[2], \
((unsigned char *)&addr)[3]
static FILE *of = NULL;
static char hostname[255];
struct intr_id {
char* name;
unsigned int id;
};
#define INTR_IDS 34
static struct intr_id intr_ids[INTR_IDS] = {
{ "oob.prefix", 0 },
{ "oob.in", 0 },
{ "oob.out", 0 },
{ "raw.mac", 0 },
{ "ip.saddr", 0 },
{ "ip.daddr", 0 },
{ "ip.totlen", 0 },
{ "ip.tos", 0 },
{ "ip.ttl", 0 },
{ "ip.id", 0 },
{ "ip.fragoff", 0 },
{ "ip.protocol", 0 },
{ "tcp.sport", 0 },
{ "tcp.dport", 0 },
{ "tcp.seq", 0 },
{ "tcp.ackseq", 0 },
{ "tcp.window", 0 },
{ "tcp.urg", 0 },
{ "tcp.ack", 0 },
{ "tcp.psh", 0 },
{ "tcp.rst", 0 },
{ "tcp.syn", 0 },
{ "tcp.fin", 0 },
{ "tcp.urgp", 0 },
{ "udp.sport", 0 },
{ "udp.dport", 0 },
{ "udp.len", 0 },
{ "icmp.type", 0 },
{ "icmp.code", 0 },
{ "icmp.echoid", 0 },
{ "icmp.echoseq", 0 },
{ "icmp.gateway", 0 },
{ "icmp.fragmtu", 0 },
{ "ahesp.spi", 0 },
};
#define GET_VALUE(x) ulogd_keyh[intr_ids[x].id].interp->result[ulogd_keyh[intr_ids[x].id].offset].value
int _output_logemu(ulog_iret_t *res)
{
char *timestr;
char *tmp;
time_t now;
/* get time */
time(&now);
timestr = ctime(&now) + 4;
/* truncate time */
if (tmp = strchr(timestr, '\n'))
*tmp = '\0';
/* truncate hostname */
if (tmp = strchr(hostname, '.'))
*tmp = '\0';
/* print time and hostname */
fprintf(of, "%.15s %s", timestr, hostname);
if (*(char *) GET_VALUE(0).ptr)
fprintf(of, " %s", (char *) GET_VALUE(0).ptr);
fprintf(of," IN=%s OUT=%s ",
(char *) GET_VALUE(1).ptr,
(char *) GET_VALUE(2).ptr);
/* FIXME: configurable */
fprintf(of, "MAC=%s ", (char *) GET_VALUE(3).ptr);
fprintf(of, "SRC=%s ", inet_ntoa(htonl(GET_VALUE(4).ui32)));
fprintf(of, "DST=%s ", inet_ntoa(htonl(GET_VALUE(5).ui32)));
fprintf(of, "LEN=%u TOS=%02X PREC=0x%02X TTL=%u ID=%u ",
GET_VALUE(6).ui16, GET_VALUE(7).ui8 & IPTOS_TOS_MASK,
GET_VALUE(7).ui8 & IPTOS_PREC_MASK, GET_VALUE(8).ui8,
GET_VALUE(9).ui16);
if (GET_VALUE(10).ui16 & IP_RF)
fprintf(of, "CE ");
if (GET_VALUE(10).ui16 & IP_DF)
fprintf(of, "DF ");
if (GET_VALUE(10).ui16 & IP_MF)
fprintf(of, "MF ");
if (GET_VALUE(10).ui16 & IP_OFFMASK)
fprintf(of, "FRAG:%u ", GET_VALUE(10).ui16 & IP_OFFMASK);
switch (GET_VALUE(11).ui8) {
case IPPROTO_TCP:
fprintf(of, "PROTO=TCP ");
fprintf(of, "SPT=%u DPT=%u ", GET_VALUE(12).ui16,
GET_VALUE(13).ui16);
/* FIXME: config */
fprintf(of, "SEQ=%u ACK=%u ", GET_VALUE(14).ui32,
GET_VALUE(15).ui32);
fprintf(of, "WINDOW=%u ", GET_VALUE(16).ui16);
// fprintf(of, "RES=0x%02x ",
if (GET_VALUE(17).b)
fprintf(of, "URG ");
if (GET_VALUE(18).b)
fprintf(of, "ACK ");
if (GET_VALUE(19).b)
fprintf(of, "PSH ");
if (GET_VALUE(20).b)
fprintf(of, "RST ");
if (GET_VALUE(21).b)
fprintf(of, "SYN ");
if (GET_VALUE(22).b)
fprintf(of, "FIN ");
fprintf(of, "URGP=%u ", GET_VALUE(23).ui16);
break;
case IPPROTO_UDP:
fprintf(of, "PROTO=UDP ");
fprintf(of, "SPT=%u DPT=%u LEN=%u ",
GET_VALUE(24).ui16, GET_VALUE(25).ui16,
GET_VALUE(26).ui16);
break;
case IPPROTO_ICMP:
fprintf(of, "PROTO=ICMP ");
fprintf(of, "TYPE=%u CODE=%u ", GET_VALUE(27).ui8,
GET_VALUE(28).ui8);
switch (GET_VALUE(27).ui8) {
case ICMP_ECHO:
case ICMP_ECHOREPLY:
fprintf(of, "ID=%u SEQ=%u ",
GET_VALUE(29).ui16,
GET_VALUE(30).ui16);
break;
case ICMP_PARAMETERPROB:
fprintf(of, "PARAMETER=%u ",
GET_VALUE(31).ui32 >> 24);
break;
case ICMP_REDIRECT:
fprintf(of, "GATEWAY=%s ", inet_ntoa(htonl(GET_VALUE(31).ui32)));
break;
case ICMP_DEST_UNREACH:
if (GET_VALUE(28).ui8 == ICMP_FRAG_NEEDED)
fprintf(of, "MTU=%u ",
GET_VALUE(32).ui16);
break;
}
break;
}
fprintf(of,"\n");
return 0;
}
/* get all key id's for the keys we are intrested in */
static int get_ids(void)
{
int i;
struct intr_id *cur_id;
for (i = 0; i < INTR_IDS; i++) {
cur_id = &intr_ids[i];
cur_id->id = keyh_getid(cur_id->name);
if (!cur_id->id) {
ulogd_log(ULOGD_ERROR,
"Cannot resolve keyhash id for %s\n",
cur_id->name);
return 1;
}
}
return 0;
}
static ulog_output_t logemu_op[] = {
{ NULL, "syslogemu", &_output_logemu },
{ NULL, "", NULL },
};
/* register output plugin with ulogd */
static void _logemu_reg_op(void)
{
ulog_output_t *op = logemu_op;
ulog_output_t *p;
for (p = op; p->output; p++)
register_output(p);
}
static config_entry_t syslogf_ce = { NULL, "syslogfile", CONFIG_TYPE_STRING,
CONFIG_OPT_NONE, 0,
{ string: ULOGD_LOGEMU_DEFAULT } };
void _init(void)
{
/* FIXME: error handling */
config_register_key(&syslogf_ce);
config_parse_file(0);
if (gethostname(hostname, sizeof(hostname)) < 0) {
ulogd_log(ULOGD_FATAL, "can't gethostname(): %s\n",
strerror(errno));
exit(2);
}
#ifdef DEBUG_LOGEMU
of = stdout;
#else
of = fopen(syslogf_ce.u.string, "a");
if (!of) {
ulogd_log(ULOGD_FATAL, "can't open syslogemu: %s\n",
strerror(errno));
exit(2);
}
#endif
if (get_ids()) {
ulogd_log(ULOGD_ERROR, "can't resolve all keyhash id's\n");
}
_logemu_reg_op();
}
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