1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2019 Gleb Smirnoff <glebius@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/param.h>
29#include <sys/ioctl.h>
30#include <net/if.h>
31#include <net/pfil.h>
32
33#include <err.h>
34#include <fcntl.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <unistd.h>
39
40static int dev;
41
42static const char * const typenames[] = {
43	[PFIL_TYPE_IP4] = "IPv4",
44	[PFIL_TYPE_IP6] = "IPv6",
45	[PFIL_TYPE_ETHERNET] = "Ethernet",
46};
47
48static void listheads(int argc, char *argv[]);
49static void listhooks(int argc, char *argv[]);
50static void hook(int argc, char *argv[]);
51static void help(void);
52
53static const struct cmd {
54	const char	*cmd_name;
55	void		(*cmd_func)(int argc, char *argv[]);
56} cmds[] = {
57	{ "heads",	listheads },
58	{ "hooks",	listhooks },
59	{ "link",	hook },
60	{ "unlink",	hook },
61	{ NULL,		NULL },
62};
63
64int
65main(int argc __unused, char *argv[] __unused)
66{
67	int cmd = -1;
68
69	if (--argc == 0)
70		help();
71	argv++;
72
73	for (int i = 0; cmds[i].cmd_name != NULL; i++)
74		if (!strncmp(argv[0], cmds[i].cmd_name, strlen(argv[0]))) {
75			if (cmd != -1)
76				errx(1, "ambiguous command: %s", argv[0]);
77			cmd = i;
78		}
79	if (cmd == -1)
80		errx(1, "unknown command: %s", argv[0]);
81
82	dev = open("/dev/" PFILDEV, O_RDWR);
83	if (dev == -1)
84		err(1, "open(%s)", "/dev/" PFILDEV);
85
86	(*cmds[cmd].cmd_func)(argc, argv);
87
88	return (0);
89}
90
91static void
92help(void)
93{
94
95	fprintf(stderr, "usage: %s (heads|hooks|link|unlink)\n", getprogname());
96	exit(0);
97}
98
99static void
100listheads(int argc __unused, char *argv[] __unused)
101{
102	struct pfilioc_list plh;
103	u_int nheads, nhooks, i;
104	int j, h;
105
106	plh.pio_nheads = 0;
107	plh.pio_nhooks = 0;
108	if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0)
109		err(1, "ioctl(PFILIOC_LISTHEADS)");
110
111retry:
112	plh.pio_heads = calloc(plh.pio_nheads, sizeof(struct pfilioc_head));
113	if (plh.pio_heads == NULL)
114		err(1, "malloc");
115	plh.pio_hooks = calloc(plh.pio_nhooks, sizeof(struct pfilioc_hook));
116	if (plh.pio_hooks == NULL)
117		err(1, "malloc");
118
119	nheads = plh.pio_nheads;
120	nhooks = plh.pio_nhooks;
121
122	if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0)
123		err(1, "ioctl(PFILIOC_LISTHEADS)");
124
125	if (plh.pio_nheads > nheads || plh.pio_nhooks > nhooks) {
126		free(plh.pio_heads);
127		free(plh.pio_hooks);
128		goto retry;
129	}
130
131#define	FMTHD	"%16s %8s\n"
132#define	FMTHK	"%29s %16s:%s\n"
133	printf("%16s %8s %3s %16s\n", "Intercept point", "Type", "Dir", "Hook");
134	for (i = 0, h = 0; i < plh.pio_nheads; i++) {
135		printf(FMTHD, plh.pio_heads[i].pio_name,
136		    typenames[plh.pio_heads[i].pio_type]);
137		for (j = 0; j < plh.pio_heads[i].pio_nhooksin; j++, h++)
138			printf(FMTHK, "In", plh.pio_hooks[h].pio_module,
139			    plh.pio_hooks[h].pio_ruleset);
140		for (j = 0; j < plh.pio_heads[i].pio_nhooksout; j++, h++)
141			printf(FMTHK, "Out", plh.pio_hooks[h].pio_module,
142			    plh.pio_hooks[h].pio_ruleset);
143	}
144}
145
146static void
147listhooks(int argc __unused, char *argv[] __unused)
148{
149	struct pfilioc_list plh;
150	u_int nhooks, i;
151
152	plh.pio_nhooks = 0;
153	if (ioctl(dev, PFILIOC_LISTHOOKS, &plh) != 0)
154		err(1, "ioctl(PFILIOC_LISTHOOKS)");
155retry:
156	plh.pio_hooks = calloc(plh.pio_nhooks, sizeof(struct pfilioc_hook));
157	if (plh.pio_hooks == NULL)
158		err(1, "malloc");
159
160	nhooks = plh.pio_nhooks;
161
162	if (ioctl(dev, PFILIOC_LISTHOOKS, &plh) != 0)
163		err(1, "ioctl(PFILIOC_LISTHOOKS)");
164
165	if (plh.pio_nhooks > nhooks) {
166		free(plh.pio_hooks);
167		goto retry;
168	}
169
170	printf("%16s %16s %8s\n", "Hook", "", "Type");
171	for (i = 0; i < plh.pio_nhooks; i++) {
172		printf("%16s:%-16s %8s\n", plh.pio_hooks[i].pio_module,
173		    plh.pio_hooks[i].pio_ruleset,
174		    typenames[plh.pio_hooks[i].pio_type]);
175	}
176}
177
178static void
179hook(int argc, char *argv[])
180{
181	struct pfilioc_link req;
182	int c;
183	char *ruleset;
184
185	if (argv[0][0] == 'u')
186		req.pio_flags = PFIL_UNLINK;
187	else
188		req.pio_flags = 0;
189
190	while ((c = getopt(argc, argv, "ioa")) != -1)
191		switch (c) {
192		case 'i':
193			req.pio_flags |= PFIL_IN;
194			break;
195		case 'o':
196			req.pio_flags |= PFIL_OUT;
197			break;
198		case 'a':
199			req.pio_flags |= PFIL_APPEND;
200			break;
201		default:
202			help();
203		}
204
205	if (!PFIL_DIR(req.pio_flags))
206		help();
207
208	argc -= optind;
209	argv += optind;
210
211	if (argc != 2)
212		help();
213
214	/* link mod:ruleset head */
215	if ((ruleset = strchr(argv[0], ':')) == NULL)
216		help();
217	*ruleset = '\0';
218	ruleset++;
219
220	strlcpy(req.pio_name, argv[1], sizeof(req.pio_name));
221	strlcpy(req.pio_module, argv[0], sizeof(req.pio_module));
222	strlcpy(req.pio_ruleset, ruleset, sizeof(req.pio_ruleset));
223
224	if (ioctl(dev, PFILIOC_LINK, &req) != 0)
225		err(1, "ioctl(PFILIOC_LINK)");
226}
227