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/* Copyright (C) 2000-2006 Boris Wesslowski */
/* $Id: cisco_ios.l,v 1.35 2006/03/08 19:36:02 bw Exp $ */
%option prefix="cisco_ios"
%option outfile="cisco_ios.c"
%option noyywrap
%{
#define YY_NO_UNPUT
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include "main.h"
#include "utils.h"
extern struct options opt;
void cisco_ios_parse_date(char *input, unsigned char mode);
void cisco_ios_parse_src(char *input, unsigned char mode);
void cisco_ios_parse_dst(char *input, unsigned char mode);
void cisco_ios_parse_if(char *input);
%}
MONTH "Jan"|"Feb"|"Mar"|"Apr"|"May"|"Jun"|"Jul"|"Aug"|"Sep"|"Oct"|"Nov"|"Dec"
STRING [a-zA-Z][a-zA-Z0-9._-]*
LOGHOST [0-9.a-zA-Z()_:-]*
DIGIT [0-9]
NUMBER {DIGIT}+
OCTET {DIGIT}{1,3}
PORT {DIGIT}{1,5}
CISCO "%SEC-6-IPACCESSLOG"("P"|"DP"|"RP"|"NP"|"S")":"
LIST [a-zA-Z0-9._>-]*
TARGET "denied"|"permitted"
PROTO "tcp"|"udp"|"icmp"|"igmp"|"gre"|"ospf"|"ipinip"|"pim"|{NUMBER}
%%
{MONTH}[ ]{1,2}{DIGIT}{1,2}[ ]{DIGIT}{2}:{DIGIT}{2}:{DIGIT}{2}[ ]{LOGHOST} cisco_ios_parse_date(cisco_iostext, CI_OPT_HOST);
{NUMBER}":" /* ignore */
{DIGIT}"y"{DIGIT}{1,2}"w:" /* ignore */
{DIGIT}{1,2}"w"{DIGIT}"d:" /* ignore */
{DIGIT}"d"{DIGIT}{2}"h:" /* ignore */
{MONTH}[ ]{1,2}{DIGIT}{1,2}[ ]{DIGIT}{2}:{DIGIT}{2}:{DIGIT}{2}"."{DIGIT}{3}":" cisco_ios_parse_date(cisco_iostext, CI_OPT_MSEC);
{MONTH}[ ]{1,2}{DIGIT}{1,2}[ ]{DIGIT}{2}:{DIGIT}{2}:{DIGIT}{2}":" cisco_ios_parse_date(cisco_iostext, CI_OPT_NONE);
{CISCO} /* ignore */
"list "{LIST}[ ]{TARGET}[ ]{PROTO}[ ]{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}"("{PORT}")" cisco_ios_parse_src(cisco_iostext, CI_OPT_PORT);
"list "{LIST}[ ]{TARGET}[ ]{PROTO}[ ]{OCTET}"."{OCTET}"."{OCTET}"."{OCTET} cisco_ios_parse_src(cisco_iostext, CI_OPT_NONE);
"list "{LIST}[ ]{TARGET}[ ]{OCTET}"."{OCTET}"."{OCTET}"."{OCTET} cisco_ios_parse_src(cisco_iostext, CI_OPT_MISSING);
"-> "{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}"("{PORT}")," cisco_ios_parse_dst(cisco_iostext, CI_OPT_PORT);
"-> "{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}" ("{NUMBER}"/"{NUMBER}")," cisco_ios_parse_dst(cisco_iostext, CI_OPT_TYPE);
"-> "{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}"," cisco_ios_parse_dst(cisco_iostext, CI_OPT_NONE);
{NUMBER}" packet"("s")? { opt.line->count = atoi(cisco_iostext); opt.parser=opt.parser|CISCO_IOS_COUNT; }
"("[A-Za-z0-9 /\._\*-]*")" cisco_ios_parse_if(cisco_iostext);
[ ]+ /* ignore whitespace */
[\n] /* ignore */
{STRING} if(opt.verbose) fprintf(stderr, "Unrecognized token: %s\n", cisco_iostext);
. if(opt.verbose) fprintf(stderr, "Unrecognized character: %s\n", cisco_iostext);
%%
void cisco_ios_parse_date(char *input, unsigned char mode)
{
int retval, day, hour, minute, second, msec;
char smonth[3];
#ifdef IRIX
char tmp[SHOSTLEN];
#endif
#ifdef LOGDOTS
char *remove_dot;
#endif
if (mode == CI_OPT_HOST) {
retval = sscanf(input, "%3s %2d %2d:%2d:%2d %32s",
smonth, &day, &hour, &minute, &second,
#ifndef IRIX
opt.line->hostname);
#else
tmp);
if(retval != 6) return;
if(tmp[2] == ':')
xstrncpy(opt.line->hostname, tmp+3, SHOSTLEN);
#endif
#ifdef LOGDOTS
remove_dot = strstr(opt.line->hostname, ".");
if(remove_dot != NULL)
*remove_dot = '\0';
#endif
} else if (mode == CI_OPT_MSEC) {
retval = sscanf(input, "%3s %2d %2d:%2d:%2d.%3d:",
smonth, &day, &hour, &minute, &second, &msec);
if(retval != 6) return;
} else if (mode == CI_OPT_NONE) {
retval = sscanf(input, "%3s %2d %2d:%2d:%2d:",
smonth, &day, &hour, &minute, &second);
if(retval != 5) return;
}
build_time(smonth, day, hour, minute, second);
opt.parser=opt.parser|CISCO_IOS_DATE;
}
void cisco_ios_parse_src(char *input, unsigned char mode)
{
char proto[8], ip[IPLEN];
int shost1, shost2, shost3, shost4;
int retval;
if (mode == CI_OPT_PORT) {
retval = sscanf(input, "list %" SHORTLEN_S "s %" SHORTLEN_S "s %5s %3d.%3d.%3d.%3d(%5d)",
opt.line->chainlabel,
opt.line->branchname,
proto,
&shost1, &shost2, &shost3, &shost4, &opt.line->sport);
if(retval != 8) return;
} else if (mode == CI_OPT_NONE) {
retval = sscanf(input, "list %" SHORTLEN_S "s %" SHORTLEN_S "s %8s %3d.%3d.%3d.%3d",
opt.line->chainlabel,
opt.line->branchname,
proto,
&shost1, &shost2, &shost3, &shost4);
if(retval != 7) return;
} else if (mode == CI_OPT_MISSING) {
return;
}
snprintf(ip, IPLEN, "%d.%d.%d.%d", shost1, shost2, shost3, shost4);
if(convert_ip(ip, &opt.line->shost) == IN_ADDR_ERROR) return;
opt.parser=opt.parser|CISCO_IOS_SRC;
if(strncmp(proto, "tcp", 3) == 0) opt.line->protocol = 6;
else if(strncmp(proto, "udp", 3) == 0) opt.line->protocol = 17;
else if(strncmp(proto, "icmp", 4) == 0) opt.line->protocol = 1;
else if(strncmp(proto, "igmp", 4) == 0) opt.line->protocol = 2;
else if(strncmp(proto, "gre", 3) == 0) opt.line->protocol = 47; /* RFC1701/1702 */
else if(strncmp(proto, "ospf", 4) == 0) opt.line->protocol = 89;
else if(strncmp(proto, "ipinip", 6) == 0) opt.line->protocol = 4;
else if(strncmp(proto, "pim", 3) == 0) opt.line->protocol = 103;
else if(isdigit((int)proto[0])) opt.line->protocol = atoi(proto);
if (opt.line->protocol != 0)
opt.parser=opt.parser|CISCO_IOS_PROTO;
}
void cisco_ios_parse_dst(char *input, unsigned char mode)
{
char ip[IPLEN];
int dhost1, dhost2, dhost3, dhost4;
int retval;
if (mode == CI_OPT_PORT) {
retval = sscanf(input, "-> %3d.%3d.%3d.%3d(%5d),",
&dhost1, &dhost2, &dhost3, &dhost4, &opt.line->dport);
if(retval != 5) return;
} else if (mode == CI_OPT_TYPE) {
retval = sscanf(input, "-> %3d.%3d.%3d.%3d (%2d/%2d),",
&dhost1, &dhost2, &dhost3, &dhost4,
&opt.line->sport, &opt.line->dport);
if(retval != 6) return;
} else if (mode == CI_OPT_NONE) {
retval = sscanf(input, "-> %3d.%3d.%3d.%3d,",
&dhost1, &dhost2, &dhost3, &dhost4);
if(retval != 4) return;
} else {
return;
}
snprintf(ip, IPLEN, "%d.%d.%d.%d", dhost1, dhost2, dhost3, dhost4);
if(convert_ip(ip, &opt.line->dhost) == IN_ADDR_ERROR) return;
opt.parser=opt.parser|CISCO_IOS_DST;
}
void cisco_ios_parse_if(char *input)
{
#ifndef SHORT_NAMES
xstrncpy(opt.line->interface, input, SHORTLEN);
#else
xstrncpy(opt.line->interface, "-", SHORTLEN);
#endif
}
unsigned char flex_cisco_ios(char *input, int linenum)
{
opt.parser = 0;
init_line();
cisco_ios_scan_string(input);
cisco_ioslex();
cisco_ios_delete_buffer(YY_CURRENT_BUFFER);
if (opt.parser == (CISCO_IOS_DATE|CISCO_IOS_SRC|CISCO_IOS_PROTO|CISCO_IOS_DST|CISCO_IOS_COUNT)) {
return PARSE_OK;
} else {
if(opt.verbose)
fprintf(stderr, "cisco_ios parse error in line %d, ignoring.\n", linenum);
if(opt.verbose == 2)
fprintf(stderr, "input was: \"%s\"\n", input);
return PARSE_WRONG_FORMAT;
}
}
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