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/*
* mod.c
*
* Copyright (c) 2001 Dug Song <dugsong@monkey.org>
*
* $Id: mod.c,v 1.19 2002/04/07 22:55:20 dugsong Exp $
*/
#include "config.h"
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "argv.h"
#include "mod.h"
#define MAX_ARGS 128 /* XXX */
struct rule {
struct mod *mod;
void *data;
TAILQ_ENTRY(rule) next;
};
/*
* XXX - new modules must be registered here.
*/
extern struct mod mod_delay;
extern struct mod mod_drop;
extern struct mod mod_dup;
extern struct mod mod_echo;
extern struct mod mod_ip_chaff;
extern struct mod mod_ip_frag;
extern struct mod mod_ip_opt;
extern struct mod mod_ip_ttl;
extern struct mod mod_ip_tos;
extern struct mod mod_order;
extern struct mod mod_print;
extern struct mod mod_tcp_chaff;
extern struct mod mod_tcp_opt;
extern struct mod mod_tcp_seg;
static struct mod *mods[] = {
&mod_delay,
&mod_drop,
&mod_dup,
&mod_echo,
&mod_ip_chaff,
&mod_ip_frag,
&mod_ip_opt,
&mod_ip_ttl,
&mod_ip_tos,
&mod_order,
&mod_print,
&mod_tcp_chaff,
&mod_tcp_opt,
&mod_tcp_seg,
NULL
};
static TAILQ_HEAD(head, rule) rules;
void
mod_usage(void)
{
struct mod **m;
for (m = mods; *m != NULL; m++) {
fprintf(stderr, " %s\n", (*m)->usage);
}
}
int
mod_open(const char *script)
{
FILE *fp;
struct mod **m;
struct rule *rule;
char *argv[MAX_ARGS], buf[BUFSIZ];
int i, argc, ret = 0;
TAILQ_INIT(&rules);
if ((fp = fopen(script, "r")) == NULL) {
warnx("couldn't open %s", script);
return (-1);
}
for (i = 1; fgets(buf, sizeof(buf), fp) != NULL; i++) {
if (*buf == '#' || *buf == '\r' || *buf == '\n')
continue;
if ((argc = argv_create(buf, MAX_ARGS, argv)) < 1) {
warnx("couldn't parse arguments (line %d)", i);
ret = -1;
break;
}
for (m = mods; *m != NULL; m++) {
if (strcasecmp((*m)->name, argv[0]) == 0)
break;
}
if (*m == NULL) {
warnx("unknown directive '%s' (line %d)", argv[0], i);
ret = -1;
break;
}
if ((rule = calloc(1, sizeof(*rule))) == NULL) {
warn("calloc");
ret = -1;
break;
}
rule->mod = *m;
if (rule->mod->open != NULL &&
(rule->data = rule->mod->open(argc, argv)) == NULL) {
warnx("invalid argument to directive '%s' (line %d)",
rule->mod->name, i);
ret = -1;
break;
}
TAILQ_INSERT_TAIL(&rules, rule, next);
}
fclose(fp);
if (ret == 0) {
buf[0] = '\0';
TAILQ_FOREACH(rule, &rules, next) {
strlcat(buf, rule->mod->name, sizeof(buf));
strlcat(buf, " -> ", sizeof(buf));
}
buf[strlen(buf) - 4] = '\0';
warnx("%s", buf);
}
return (ret);
}
void
mod_apply(struct pktq *pktq)
{
struct rule *rule;
TAILQ_FOREACH(rule, &rules, next) {
rule->mod->apply(rule->data, pktq);
}
}
void
mod_close(void)
{
struct rule *rule;
TAILQ_FOREACH_REVERSE(rule, &rules, next, head) {
if (rule->mod->close != NULL)
rule->data = rule->mod->close(rule->data);
TAILQ_REMOVE(&rules, rule, next);
free(rule);
}
}
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