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/* filter generator, Cisco IOS driver
*
* Copyright (c) 2002 Matthew Kirkwood
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* XXX - does this need skeleton rules? */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "filter.h"
#include "util.h"
static char *appip(char *r, const struct addr_spec *h) {
if (!h->addrstr)
return APPS(r, "any");
if (!h->maskstr)
return APPS2(r, "host ", h->addrstr);
return APPSS2(r, h->addrstr, h->maskstr);
}
static char *appport(char *r, const struct port_spec *p, int neg) {
if (!p->minstr)
return APPS(r, "any");
if (!p->maxstr)
return APPS2(r, neg ? "ne " : "eq ", p->minstr);
if (neg)
abort();
APPS(r, "range");
APPSS2(r, p->minstr, p->maxstr);
return r;
}
static int cb_cisco_rule(const struct filterent *ent,
struct fg_misc *misc __attribute__((unused))) {
char *rule = NULL, *rule_r = NULL;
int needret = 0, needports = 1;
APP(rule, "access-list ");
APP(rule_r, "access-list ");
/* access list name */
if (ent->iface) {
APP2(rule, ent->iface, "-");
APP2(rule_r, ent->iface, "-");
}
switch (ent->direction) {
case INPUT:
APP(rule, "IN");
APP(rule_r, "OUT");
break;
case OUTPUT:
APP(rule, "OUT");
APP(rule_r, "IN");
break;
default:
fprintf(stderr, "invalid direction: %d\n", ent->direction);
return -1;
}
/* target */
switch (ent->target) {
case T_ACCEPT:
APPS(rule, "permit");
APPS(rule_r, "permit");
break;
case DROP:
APPS(rule, "deny");
APPS(rule_r, "deny");
break;
case T_REJECT:
fprintf(stderr, "warning: Cisco IOS does not support REJECT\n");
APPS(rule, "deny");
APPS(rule_r, "deny");
break;
default:
fprintf(stderr, "invalid target: %d\n", ent->target);
return -1;
}
/* protocol */
if (ent->proto.name) {
APPS(rule, ent->proto.name);
APPS(rule_r, ent->proto.name);
switch (ent->proto.num) {
case IPPROTO_TCP:
case IPPROTO_UDP:
needret++;
break;
default:
needports = 0;
}
} else {
APPS(rule, "ip");
APPS(rule_r, "ip");
}
rule = appip(rule, &ent->srcaddr);
rule = appip(rule, &ent->dstaddr);
rule_r = appip(rule_r, &ent->dstaddr);
rule_r = appip(rule_r, &ent->srcaddr);
if (needports) {
rule = appport(rule, &ent->u.ports.src, NEG(SPORT));
rule = appport(rule, &ent->u.ports.dst, NEG(DPORT));
rule_r = appport(rule_r, &ent->u.ports.dst, NEG(DPORT));
rule_r = appport(rule_r, &ent->u.ports.src, NEG(SPORT));
}
if (ent->proto.num == IPPROTO_TCP)
APPS(rule_r, "established");
if (ESET(ent, LOG))
APPS(rule, "log");
if (ent->oneway)
needret = 0;
oputs(rule);
if (needret)
oputs(rule_r);
free(rule);
free(rule_r);
return 1 + !!needret;
}
int fg_cisco(struct filter *filter, int flags) {
struct fg_misc misc = {flags, NULL};
fg_callback cb_cisco = {.rule = cb_cisco_rule, NULL};
oputs("# Warning: This backend is not complete and "
"can generate broken rulesets.");
filter_nogroup(filter);
filter_unroll(&filter);
return filtergen_cprod(filter, &cb_cisco, &misc);
}
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