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/* Copyright (C) 2000-2006 Boris Wesslowski */
/* $Id: ipfw.l,v 1.7 2006/03/08 20:27:59 bw Exp $ */
%option prefix="ipfw"
%option outfile="ipfw.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 ipfw_parse_start(char *input);
void ipfw_parse_proto(char *input, unsigned char mode);
void ipfw_parse_ips(char *input, unsigned char mode);
%}
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}
PROTO "TCP"|"UDP"
%%
{MONTH}[ ]{1,2}{DIGIT}{1,2}[ ]{DIGIT}{2}:{DIGIT}{2}:{DIGIT}{2}[ ]{LOGHOST} ipfw_parse_start(ipfwtext);
" kernel: ipfw: "{NUMBER} { xstrncpy(opt.line->chainlabel, ipfwtext+15, SHORTLEN); opt.parser=opt.parser|IPFW_CHAIN; };
" ipfw: "{NUMBER} { xstrncpy(opt.line->chainlabel, ipfwtext+7, SHORTLEN); opt.parser=opt.parser|IPFW_CHAIN; };
"Deny" { xstrncpy(opt.line->branchname, ipfwtext, SHORTLEN); opt.parser=opt.parser|IPFW_BRANCH; };
"Count" { xstrncpy(opt.line->branchname, ipfwtext, SHORTLEN); opt.parser=opt.parser|IPFW_BRANCH; };
"Accept" { xstrncpy(opt.line->branchname, ipfwtext, SHORTLEN); opt.parser=opt.parser|IPFW_BRANCH; };
{PROTO} ipfw_parse_proto(ipfwtext, IPFW_OPT_NONE);
"ICMP:"{NUMBER}"."{NUMBER} ipfw_parse_proto(ipfwtext+5, IPFW_OPT_ICMP);
{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}[ ]{OCTET}"."{OCTET}"."{OCTET}"."{OCTET} ipfw_parse_ips(ipfwtext, IPFW_OPT_NONE);
{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}":"{PORT}[ ]{OCTET}"."{OCTET}"."{OCTET}"."{OCTET}":"{PORT} ipfw_parse_ips(ipfwtext, IPFW_OPT_PORTS);
"in via "{STRING} { xstrncpy(opt.line->interface, ipfwtext+7, SHORTLEN); opt.parser=opt.parser|IPFW_IF; }
[ ] /* ignore whitespace */
[\n] return 0;
{STRING} if(opt.verbose) fprintf(stderr, "Unrecognized token: %s\n", ipfwtext);
. if(opt.verbose) fprintf(stderr, "Unrecognized character: %s\n", ipfwtext);
%%
void ipfw_parse_start(char *input)
{
int retval, day, hour, minute, second;
char smonth[3];
retval = sscanf(input,
"%3s %2d %2d:%2d:%2d %32s",
smonth, &day, &hour, &minute, &second,
opt.line->hostname);
if (retval != 6) {
return;
}
build_time(smonth, day, hour, minute, second);
opt.parser=opt.parser|IPFW_DATE;
}
void ipfw_parse_proto(char *input, unsigned char mode)
{
int retval;
char *pnt;
if(mode == IPFW_OPT_NONE) {
if(strncmp(input, "TCP", 3) == 0) opt.line->protocol = 6;
if(strncmp(input, "UDP", 3) == 0) opt.line->protocol = 17;
} else if(mode == IPFW_OPT_ICMP) {
opt.line->protocol = 1;
pnt = strstr(input, ".");
*pnt = ' ';
retval = sscanf(input, "%2d %2d", &opt.line->sport, &opt.line->dport);
if (retval != 2) {
return;
}
opt.parser=opt.parser|IPFW_PORTS;
}
if(opt.line->protocol != 0) {
opt.parser=opt.parser|IPFW_PROTO;
}
}
void ipfw_parse_ips(char *input, unsigned char mode)
{
int retval;
char src[16], dst[16], *pnt;
if (mode == IPFW_OPT_PORTS) {
pnt = strstr(input, ":");
*pnt = ' ';
pnt = strstr(input, ":");
*pnt = ' ';
retval = sscanf(input, "%16s %5d %16s %5d",
src, &opt.line->sport, dst, &opt.line->dport);
if (retval != 4) {
return;
}
opt.parser=opt.parser|IPFW_PORTS;
} else if (mode == IPFW_OPT_NONE) {
retval = sscanf(input, "%16s %16s", src, dst);
if (retval != 2) {
return;
}
}
if(convert_ip(src, &opt.line->shost) == IN_ADDR_ERROR) return;
if(convert_ip(dst, &opt.line->dhost) == IN_ADDR_ERROR) return;
opt.parser=opt.parser|IPFW_IPS;
}
unsigned char flex_ipfw(char *input, int linenum)
{
opt.parser = 0;
init_line();
ipfw_scan_string(input);
ipfwlex();
ipfw_delete_buffer(YY_CURRENT_BUFFER);
opt.line->count = 1;
if (opt.parser == (IPFW_DATE|IPFW_CHAIN|IPFW_BRANCH|IPFW_PROTO|IPFW_IPS|IPFW_PORTS|IPFW_IF)) {
return PARSE_OK;
}
if(opt.verbose)
fprintf(stderr, "ipfw 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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