File: mod.c

package info (click to toggle)
fragroute 1.2-7
  • links: PTS
  • area: main
  • in suites: sarge
  • size: 692 kB
  • ctags: 520
  • sloc: ansic: 4,331; sh: 2,842; makefile: 74
file content (160 lines) | stat: -rw-r--r-- 2,983 bytes parent folder | download | duplicates (2)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/*
 * 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);
	}
}