lib/common/ports.c

/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: ports.c,v 1.9.4.1 2004/12/09 19:41:22 darrenr Exp $
 */

#include <ctype.h>

#include "ipf.h"


/*
 * check for possible presence of the port fields in the line
 */
int ports(seg, proto, pp, cp, tp, linenum)
char    ***seg;
char    *proto;
u_short *pp;
int *cp;
u_short *tp;
int     linenum;
{
    int comp = -1;

    if (!*seg || !**seg || !***seg)
        return 0;
    if (!strcasecmp(**seg, "port") && *(*seg + 1) && *(*seg + 2)) {
        (*seg)++;
        if (ISALNUM(***seg) && *(*seg + 2)) {
            if (portnum(**seg, proto, pp, linenum) == 0)
                return -1;
            (*seg)++;
            if (!strcmp(**seg, "<>"))
                comp = FR_OUTRANGE;
            else if (!strcmp(**seg, "><"))
                comp = FR_INRANGE;
            else {
                fprintf(stderr,
                    "%d: unknown range operator (%s)\n",
                    linenum, **seg);
                return -1;
            }
            (*seg)++;
            if (**seg == NULL) {
                fprintf(stderr, "%d: missing 2nd port value\n",
                    linenum);
                return -1;
            }
            if (portnum(**seg, proto, tp, linenum) == 0)
                return -1;
        } else if (!strcmp(**seg, "=") || !strcasecmp(**seg, "eq"))
            comp = FR_EQUAL;
        else if (!strcmp(**seg, "!=") || !strcasecmp(**seg, "ne"))
            comp = FR_NEQUAL;
        else if (!strcmp(**seg, "<") || !strcasecmp(**seg, "lt"))
            comp = FR_LESST;
        else if (!strcmp(**seg, ">") || !strcasecmp(**seg, "gt"))
            comp = FR_GREATERT;
        else if (!strcmp(**seg, "<=") || !strcasecmp(**seg, "le"))
            comp = FR_LESSTE;
        else if (!strcmp(**seg, ">=") || !strcasecmp(**seg, "ge"))
            comp = FR_GREATERTE;
        else {
            fprintf(stderr, "%d: unknown comparator (%s)\n",
                    linenum, **seg);
            return -1;
        }
        if (comp != FR_OUTRANGE && comp != FR_INRANGE) {
            (*seg)++;
            if (portnum(**seg, proto, pp, linenum) == 0)
                return -1;
        }
        *cp = comp;
        (*seg)++;
    }
    return 0;
}