freebsd-dev/sbin/pfilctl/pfilctl.c
Warner Losh 4d846d260e spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with:		pfg
MFC After:		3 days
Sponsored by:		Netflix
2023-05-12 10:44:03 -06:00

230 lines
5.7 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Gleb Smirnoff <glebius@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/pfil.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static int dev;
static const char * const typenames[] = {
[PFIL_TYPE_IP4] = "IPv4",
[PFIL_TYPE_IP6] = "IPv6",
[PFIL_TYPE_ETHERNET] = "Ethernet",
};
static void listheads(int argc, char *argv[]);
static void listhooks(int argc, char *argv[]);
static void hook(int argc, char *argv[]);
static void help(void);
static const struct cmd {
const char *cmd_name;
void (*cmd_func)(int argc, char *argv[]);
} cmds[] = {
{ "heads", listheads },
{ "hooks", listhooks },
{ "link", hook },
{ "unlink", hook },
{ NULL, NULL },
};
int
main(int argc __unused, char *argv[] __unused)
{
int cmd = -1;
if (--argc == 0)
help();
argv++;
for (int i = 0; cmds[i].cmd_name != NULL; i++)
if (!strncmp(argv[0], cmds[i].cmd_name, strlen(argv[0]))) {
if (cmd != -1)
errx(1, "ambiguous command: %s", argv[0]);
cmd = i;
}
if (cmd == -1)
errx(1, "unknown command: %s", argv[0]);
dev = open("/dev/" PFILDEV, O_RDWR);
if (dev == -1)
err(1, "open(%s)", "/dev/" PFILDEV);
(*cmds[cmd].cmd_func)(argc, argv);
return (0);
}
static void
help(void)
{
fprintf(stderr, "usage: %s (heads|hooks|link|unlink)\n", getprogname());
exit(0);
}
static void
listheads(int argc __unused, char *argv[] __unused)
{
struct pfilioc_list plh;
u_int nheads, nhooks, i;
int j, h;
plh.pio_nheads = 0;
plh.pio_nhooks = 0;
if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0)
err(1, "ioctl(PFILIOC_LISTHEADS)");
retry:
plh.pio_heads = calloc(plh.pio_nheads, sizeof(struct pfilioc_head));
if (plh.pio_heads == NULL)
err(1, "malloc");
plh.pio_hooks = calloc(plh.pio_nhooks, sizeof(struct pfilioc_hook));
if (plh.pio_hooks == NULL)
err(1, "malloc");
nheads = plh.pio_nheads;
nhooks = plh.pio_nhooks;
if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0)
err(1, "ioctl(PFILIOC_LISTHEADS)");
if (plh.pio_nheads > nheads || plh.pio_nhooks > nhooks) {
free(plh.pio_heads);
free(plh.pio_hooks);
goto retry;
}
#define FMTHD "%16s %8s\n"
#define FMTHK "%29s %16s:%s\n"
printf("%16s %8s %3s %16s\n", "Intercept point", "Type", "Dir", "Hook");
for (i = 0, h = 0; i < plh.pio_nheads; i++) {
printf(FMTHD, plh.pio_heads[i].pio_name,
typenames[plh.pio_heads[i].pio_type]);
for (j = 0; j < plh.pio_heads[i].pio_nhooksin; j++, h++)
printf(FMTHK, "In", plh.pio_hooks[h].pio_module,
plh.pio_hooks[h].pio_ruleset);
for (j = 0; j < plh.pio_heads[i].pio_nhooksout; j++, h++)
printf(FMTHK, "Out", plh.pio_hooks[h].pio_module,
plh.pio_hooks[h].pio_ruleset);
}
}
static void
listhooks(int argc __unused, char *argv[] __unused)
{
struct pfilioc_list plh;
u_int nhooks, i;
plh.pio_nhooks = 0;
if (ioctl(dev, PFILIOC_LISTHEADS, &plh) != 0)
err(1, "ioctl(PFILIOC_LISTHEADS)");
retry:
plh.pio_hooks = calloc(plh.pio_nhooks, sizeof(struct pfilioc_hook));
if (plh.pio_hooks == NULL)
err(1, "malloc");
nhooks = plh.pio_nhooks;
if (ioctl(dev, PFILIOC_LISTHOOKS, &plh) != 0)
err(1, "ioctl(PFILIOC_LISTHOOKS)");
if (plh.pio_nhooks > nhooks) {
free(plh.pio_hooks);
goto retry;
}
printf("%16s %16s %8s\n", "Hook", "", "Type");
for (i = 0; i < plh.pio_nhooks; i++) {
printf("%16s:%-16s %8s\n", plh.pio_hooks[i].pio_module,
plh.pio_hooks[i].pio_ruleset,
typenames[plh.pio_hooks[i].pio_type]);
}
}
static void
hook(int argc, char *argv[])
{
struct pfilioc_link req;
int c;
char *ruleset;
if (argv[0][0] == 'u')
req.pio_flags = PFIL_UNLINK;
else
req.pio_flags = 0;
while ((c = getopt(argc, argv, "ioa")) != -1)
switch (c) {
case 'i':
req.pio_flags |= PFIL_IN;
break;
case 'o':
req.pio_flags |= PFIL_OUT;
break;
case 'a':
req.pio_flags |= PFIL_APPEND;
break;
default:
help();
}
if (!PFIL_DIR(req.pio_flags))
help();
argc -= optind;
argv += optind;
if (argc != 2)
help();
/* link mod:ruleset head */
if ((ruleset = strchr(argv[0], ':')) == NULL)
help();
*ruleset = '\0';
ruleset++;
strlcpy(req.pio_name, argv[1], sizeof(req.pio_name));
strlcpy(req.pio_module, argv[0], sizeof(req.pio_module));
strlcpy(req.pio_ruleset, ruleset, sizeof(req.pio_ruleset));
if (ioctl(dev, PFILIOC_LINK, &req) != 0)
err(1, "ioctl(PFILIOC_LINK)");
}