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/* $FreeBSD$ */
%{
/*
* Copyright (C) 1997-1998 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* $Id: iplang_l.l,v 2.8 2003/07/28 01:15:31 darrenr Exp $
*/
#include <stdio.h>
#include <string.h>
#include <sys/param.h>
#if defined(__SVR4) || defined(__sysv__)
#include <sys/stream.h>
#endif
#include <sys/types.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include "iplang_y.h"
#include "ipf.h"
#ifndef __P
# ifdef __STDC__
# define __P(x) x
# else
# define __P(x) ()
# endif
#endif
extern int opts;
int lineNum = 0, ipproto = 0, oldipproto = 0, next = -1, laststate = 0;
int *prstack = NULL, numpr = 0, state = 0, token = 0;
void yyerror __P((char *));
void push_proto __P((void));
void pop_proto __P((void));
int next_state __P((int, int));
int next_item __P((int));
int save_token __P((void));
void swallow __P((void));
int yylex __P((void));
struct lwordtab {
char *word;
int state;
int next;
};
struct lwordtab words[] = {
{ "interface", IL_INTERFACE, -1 },
{ "iface", IL_INTERFACE, -1 },
{ "name", IL_IFNAME, IL_TOKEN },
{ "ifname", IL_IFNAME, IL_TOKEN },
{ "router", IL_DEFROUTER, IL_TOKEN },
{ "mtu", IL_MTU, IL_NUMBER },
{ "eaddr", IL_EADDR, IL_TOKEN },
{ "v4addr", IL_V4ADDR, IL_TOKEN },
{ "ipv4", IL_IPV4, -1 },
{ "v", IL_V4V, IL_TOKEN },
{ "proto", IL_V4PROTO, IL_TOKEN },
{ "hl", IL_V4HL, IL_TOKEN },
{ "id", IL_V4ID, IL_TOKEN },
{ "ttl", IL_V4TTL, IL_TOKEN },
{ "tos", IL_V4TOS, IL_TOKEN },
{ "src", IL_V4SRC, IL_TOKEN },
{ "dst", IL_V4DST, IL_TOKEN },
{ "opt", IL_OPT, -1 },
{ "len", IL_LEN, IL_TOKEN },
{ "off", IL_OFF, IL_TOKEN },
{ "sum", IL_SUM, IL_TOKEN },
{ "tcp", IL_TCP, -1 },
{ "sport", IL_SPORT, IL_TOKEN },
{ "dport", IL_DPORT, IL_TOKEN },
{ "seq", IL_TCPSEQ, IL_TOKEN },
{ "ack", IL_TCPACK, IL_TOKEN },
{ "flags", IL_TCPFL, IL_TOKEN },
{ "urp", IL_TCPURP, IL_TOKEN },
{ "win", IL_TCPWIN, IL_TOKEN },
{ "udp", IL_UDP, -1 },
{ "send", IL_SEND, -1 },
{ "via", IL_VIA, IL_TOKEN },
{ "arp", IL_ARP, -1 },
{ "data", IL_DATA, -1 },
{ "value", IL_DVALUE, IL_TOKEN },
{ "file", IL_DFILE, IL_TOKEN },
{ "nop", IL_IPO_NOP, -1 },
{ "eol", IL_IPO_EOL, -1 },
{ "rr", IL_IPO_RR, -1 },
{ "zsu", IL_IPO_ZSU, -1 },
{ "mtup", IL_IPO_MTUP, -1 },
{ "mtur", IL_IPO_MTUR, -1 },
{ "encode", IL_IPO_ENCODE, -1 },
{ "ts", IL_IPO_TS, -1 },
{ "tr", IL_IPO_TR, -1 },
{ "sec", IL_IPO_SEC, -1 },
{ "secclass", IL_IPO_SECCLASS, IL_TOKEN },
{ "lsrr", IL_IPO_LSRR, -1 },
{ "esec", IL_IPO_ESEC, -1 },
{ "cipso", IL_IPO_CIPSO, -1 },
{ "satid", IL_IPO_SATID, -1 },
{ "ssrr", IL_IPO_SSRR, -1 },
{ "addext", IL_IPO_ADDEXT, -1 },
{ "visa", IL_IPO_VISA, -1 },
{ "imitd", IL_IPO_IMITD, -1 },
{ "eip", IL_IPO_EIP, -1 },
{ "finn", IL_IPO_FINN, -1 },
{ "mss", IL_TCPO_MSS, IL_TOKEN },
{ "wscale", IL_TCPO_WSCALE, IL_TOKEN },
{ "reserv-4", IL_IPS_RESERV4, -1 },
{ "topsecret", IL_IPS_TOPSECRET, -1 },
{ "secret", IL_IPS_SECRET, -1 },
{ "reserv-3", IL_IPS_RESERV3, -1 },
{ "confid", IL_IPS_CONFID, -1 },
{ "unclass", IL_IPS_UNCLASS, -1 },
{ "reserv-2", IL_IPS_RESERV2, -1 },
{ "reserv-1", IL_IPS_RESERV1, -1 },
{ "icmp", IL_ICMP, -1 },
{ "type", IL_ICMPTYPE, -1 },
{ "code", IL_ICMPCODE, -1 },
{ "echorep", IL_ICMP_ECHOREPLY, -1 },
{ "unreach", IL_ICMP_UNREACH, -1 },
{ "squench", IL_ICMP_SOURCEQUENCH, -1 },
{ "redir", IL_ICMP_REDIRECT, -1 },
{ "echo", IL_ICMP_ECHO, -1 },
{ "routerad", IL_ICMP_ROUTERADVERT, -1 },
{ "routersol", IL_ICMP_ROUTERSOLICIT, -1 },
{ "timex", IL_ICMP_TIMXCEED, -1 },
{ "paramprob", IL_ICMP_PARAMPROB, -1 },
{ "timest", IL_ICMP_TSTAMP, -1 },
{ "timestrep", IL_ICMP_TSTAMPREPLY, -1 },
{ "inforeq", IL_ICMP_IREQ, -1 },
{ "inforep", IL_ICMP_IREQREPLY, -1 },
{ "maskreq", IL_ICMP_MASKREQ, -1 },
{ "maskrep", IL_ICMP_MASKREPLY, -1 },
{ "net-unr", IL_ICMP_UNREACH_NET, -1 },
{ "host-unr", IL_ICMP_UNREACH_HOST, -1 },
{ "proto-unr", IL_ICMP_UNREACH_PROTOCOL, -1 },
{ "port-unr", IL_ICMP_UNREACH_PORT, -1 },
{ "needfrag", IL_ICMP_UNREACH_NEEDFRAG, -1 },
{ "srcfail", IL_ICMP_UNREACH_SRCFAIL, -1 },
{ "net-unk", IL_ICMP_UNREACH_NET_UNKNOWN, -1 },
{ "host-unk", IL_ICMP_UNREACH_HOST_UNKNOWN, -1 },
{ "isolate", IL_ICMP_UNREACH_ISOLATED, -1 },
{ "net-prohib", IL_ICMP_UNREACH_NET_PROHIB, -1 },
{ "host-prohib", IL_ICMP_UNREACH_HOST_PROHIB, -1 },
{ "net-tos", IL_ICMP_UNREACH_TOSNET, -1 },
{ "host-tos", IL_ICMP_UNREACH_TOSHOST, -1 },
{ "filter-prohib", IL_ICMP_UNREACH_FILTER_PROHIB, -1 },
{ "host-preced", IL_ICMP_UNREACH_HOST_PRECEDENCE, -1 },
{ "cutoff-preced", IL_ICMP_UNREACH_PRECEDENCE_CUTOFF, -1 },
{ "net-redir", IL_ICMP_REDIRECT_NET, -1 },
{ "host-redir", IL_ICMP_REDIRECT_HOST, -1 },
{ "tos-net-redir", IL_ICMP_REDIRECT_TOSNET, -1 },
{ "tos-host-redir", IL_ICMP_REDIRECT_TOSHOST, -1 },
{ "intrans", IL_ICMP_TIMXCEED_INTRANS, -1 },
{ "reass", IL_ICMP_TIMXCEED_REASS, -1 },
{ "optabsent", IL_ICMP_PARAMPROB_OPTABSENT, -1 },
{ "otime", IL_ICMP_OTIME, -1 },
{ "rtime", IL_ICMP_RTIME, -1 },
{ "ttime", IL_ICMP_TTIME, -1 },
{ "icmpseq", IL_ICMP_SEQ, -1 },
{ "icmpid", IL_ICMP_SEQ, -1 },
{ ".", IL_DOT, -1 },
{ NULL, 0, 0 }
};
%}
white [ \t\r]+
%%
{white} ;
\n { lineNum++; swallow(); }
\{ { push_proto(); return next_item('{'); }
\} { pop_proto(); return next_item('}'); }
; { return next_item(';'); }
[0-9]+ { return next_item(IL_NUMBER); }
[0-9a-fA-F] { return next_item(IL_HEXDIGIT); }
: { return next_item(IL_COLON); }
#[^\n]* { return next_item(IL_COMMENT); }
[^ \{\}\n\t;:{}]* { return next_item(IL_TOKEN); }
\"[^\"]*\" { return next_item(IL_TOKEN); }
%%
void yyerror(msg)
char *msg;
{
fprintf(stderr, "%s error at \"%s\", line %d\n", msg, yytext,
lineNum + 1);
exit(1);
}
void push_proto()
{
numpr++;
if (!prstack)
prstack = (int *)malloc(sizeof(int));
else
prstack = (int *)realloc((char *)prstack, numpr * sizeof(int));
prstack[numpr - 1] = oldipproto;
}
void pop_proto()
{
numpr--;
ipproto = prstack[numpr];
if (!numpr) {
free(prstack);
prstack = NULL;
return;
}
prstack = (int *)realloc((char *)prstack, numpr * sizeof(int));
}
int save_token()
{
yylval.str = strdup((char *)yytext);
return IL_TOKEN;
}
int next_item(nstate)
int nstate;
{
struct lwordtab *wt;
if (opts & OPT_DEBUG)
printf("text=[%s] id=%d next=%d\n", yytext, nstate, next);
if (next == IL_TOKEN) {
next = -1;
return save_token();
}
token++;
for (wt = words; wt->word; wt++)
if (!strcasecmp(wt->word, (char *)yytext))
return next_state(wt->state, wt->next);
if (opts & OPT_DEBUG)
printf("unknown keyword=[%s]\n", yytext);
next = -1;
if (nstate == IL_NUMBER)
yylval.num = atoi((char *)yytext);
token++;
return nstate;
}
int next_state(nstate, fornext)
int nstate, fornext;
{
next = fornext;
switch (nstate)
{
case IL_IPV4 :
case IL_TCP :
case IL_UDP :
case IL_ICMP :
case IL_DATA :
case IL_INTERFACE :
case IL_ARP :
oldipproto = ipproto;
ipproto = nstate;
break;
case IL_SUM :
if (ipproto == IL_IPV4)
nstate = IL_V4SUM;
else if (ipproto == IL_TCP)
nstate = IL_TCPSUM;
else if (ipproto == IL_UDP)
nstate = IL_UDPSUM;
break;
case IL_OPT :
if (ipproto == IL_IPV4)
nstate = IL_V4OPT;
else if (ipproto == IL_TCP)
nstate = IL_TCPOPT;
break;
case IL_IPO_NOP :
if (ipproto == IL_TCP)
nstate = IL_TCPO_NOP;
break;
case IL_IPO_EOL :
if (ipproto == IL_TCP)
nstate = IL_TCPO_EOL;
break;
case IL_IPO_TS :
if (ipproto == IL_TCP)
nstate = IL_TCPO_TS;
break;
case IL_OFF :
if (ipproto == IL_IPV4)
nstate = IL_V4OFF;
else if (ipproto == IL_TCP)
nstate = IL_TCPOFF;
break;
case IL_LEN :
if (ipproto == IL_IPV4)
nstate = IL_V4LEN;
else if (ipproto == IL_UDP)
nstate = IL_UDPLEN;
break;
}
return nstate;
}
void swallow()
{
int c;
c = input();
if (c == '#') {
while ((c != '\n') && (c != EOF))
c = input();
}
if (c != EOF)
unput(c);
}
|
