freebsd-dev/sbin/pfctl/pfctl_radix.c
Kristof Provost 72a3cf0f41 pfctl: Use const where possible.
This adds const qualifiers where it is possible.

Submitted by:	Christian Mauderer <christian.mauderer@embedded-brains.de>
2016-08-02 20:32:02 +00:00

586 lines
12 KiB
C

/* $OpenBSD: pfctl_radix.c,v 1.27 2005/05/21 21:03:58 henning Exp $ */
/*
* Copyright (c) 2002 Cedric Berger
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/pfvar.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <err.h>
#include "pfctl.h"
#define BUF_SIZE 256
extern int dev;
static int pfr_next_token(char buf[], FILE *);
int
pfr_clr_tables(struct pfr_table *filter, int *ndel, int flags)
{
struct pfioc_table io;
bzero(&io, sizeof io);
io.pfrio_flags = flags;
if (filter != NULL)
io.pfrio_table = *filter;
if (ioctl(dev, DIOCRCLRTABLES, &io))
return (-1);
if (ndel != NULL)
*ndel = io.pfrio_ndel;
return (0);
}
int
pfr_add_tables(struct pfr_table *tbl, int size, int *nadd, int flags)
{
struct pfioc_table io;
if (size < 0 || (size && tbl == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_buffer = tbl;
io.pfrio_esize = sizeof(*tbl);
io.pfrio_size = size;
if (ioctl(dev, DIOCRADDTABLES, &io))
return (-1);
if (nadd != NULL)
*nadd = io.pfrio_nadd;
return (0);
}
int
pfr_del_tables(struct pfr_table *tbl, int size, int *ndel, int flags)
{
struct pfioc_table io;
if (size < 0 || (size && tbl == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_buffer = tbl;
io.pfrio_esize = sizeof(*tbl);
io.pfrio_size = size;
if (ioctl(dev, DIOCRDELTABLES, &io))
return (-1);
if (ndel != NULL)
*ndel = io.pfrio_ndel;
return (0);
}
int
pfr_get_tables(struct pfr_table *filter, struct pfr_table *tbl, int *size,
int flags)
{
struct pfioc_table io;
if (size == NULL || *size < 0 || (*size && tbl == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
if (filter != NULL)
io.pfrio_table = *filter;
io.pfrio_buffer = tbl;
io.pfrio_esize = sizeof(*tbl);
io.pfrio_size = *size;
if (ioctl(dev, DIOCRGETTABLES, &io))
return (-1);
*size = io.pfrio_size;
return (0);
}
int
pfr_get_tstats(struct pfr_table *filter, struct pfr_tstats *tbl, int *size,
int flags)
{
struct pfioc_table io;
if (size == NULL || *size < 0 || (*size && tbl == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
if (filter != NULL)
io.pfrio_table = *filter;
io.pfrio_buffer = tbl;
io.pfrio_esize = sizeof(*tbl);
io.pfrio_size = *size;
if (ioctl(dev, DIOCRGETTSTATS, &io))
return (-1);
*size = io.pfrio_size;
return (0);
}
int
pfr_clr_addrs(struct pfr_table *tbl, int *ndel, int flags)
{
struct pfioc_table io;
if (tbl == NULL) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
if (ioctl(dev, DIOCRCLRADDRS, &io))
return (-1);
if (ndel != NULL)
*ndel = io.pfrio_ndel;
return (0);
}
int
pfr_add_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
int *nadd, int flags)
{
struct pfioc_table io;
if (tbl == NULL || size < 0 || (size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = size;
if (ioctl(dev, DIOCRADDADDRS, &io))
return (-1);
if (nadd != NULL)
*nadd = io.pfrio_nadd;
return (0);
}
int
pfr_del_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
int *ndel, int flags)
{
struct pfioc_table io;
if (tbl == NULL || size < 0 || (size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = size;
if (ioctl(dev, DIOCRDELADDRS, &io))
return (-1);
if (ndel != NULL)
*ndel = io.pfrio_ndel;
return (0);
}
int
pfr_set_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
int *size2, int *nadd, int *ndel, int *nchange, int flags)
{
struct pfioc_table io;
if (tbl == NULL || size < 0 || (size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = size;
io.pfrio_size2 = (size2 != NULL) ? *size2 : 0;
if (ioctl(dev, DIOCRSETADDRS, &io))
return (-1);
if (nadd != NULL)
*nadd = io.pfrio_nadd;
if (ndel != NULL)
*ndel = io.pfrio_ndel;
if (nchange != NULL)
*nchange = io.pfrio_nchange;
if (size2 != NULL)
*size2 = io.pfrio_size2;
return (0);
}
int
pfr_get_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int *size,
int flags)
{
struct pfioc_table io;
if (tbl == NULL || size == NULL || *size < 0 ||
(*size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = *size;
if (ioctl(dev, DIOCRGETADDRS, &io))
return (-1);
*size = io.pfrio_size;
return (0);
}
int
pfr_get_astats(struct pfr_table *tbl, struct pfr_astats *addr, int *size,
int flags)
{
struct pfioc_table io;
if (tbl == NULL || size == NULL || *size < 0 ||
(*size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = *size;
if (ioctl(dev, DIOCRGETASTATS, &io))
return (-1);
*size = io.pfrio_size;
return (0);
}
int
pfr_clr_tstats(struct pfr_table *tbl, int size, int *nzero, int flags)
{
struct pfioc_table io;
if (size < 0 || (size && !tbl)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_buffer = tbl;
io.pfrio_esize = sizeof(*tbl);
io.pfrio_size = size;
if (ioctl(dev, DIOCRCLRTSTATS, &io))
return (-1);
if (nzero)
*nzero = io.pfrio_nzero;
return (0);
}
int
pfr_tst_addrs(struct pfr_table *tbl, struct pfr_addr *addr, int size,
int *nmatch, int flags)
{
struct pfioc_table io;
if (tbl == NULL || size < 0 || (size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = size;
if (ioctl(dev, DIOCRTSTADDRS, &io))
return (-1);
if (nmatch)
*nmatch = io.pfrio_nmatch;
return (0);
}
int
pfr_ina_define(struct pfr_table *tbl, struct pfr_addr *addr, int size,
int *nadd, int *naddr, int ticket, int flags)
{
struct pfioc_table io;
if (tbl == NULL || size < 0 || (size && addr == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
io.pfrio_flags = flags;
io.pfrio_table = *tbl;
io.pfrio_buffer = addr;
io.pfrio_esize = sizeof(*addr);
io.pfrio_size = size;
io.pfrio_ticket = ticket;
if (ioctl(dev, DIOCRINADEFINE, &io))
return (-1);
if (nadd != NULL)
*nadd = io.pfrio_nadd;
if (naddr != NULL)
*naddr = io.pfrio_naddr;
return (0);
}
/* interface management code */
int
pfi_get_ifaces(const char *filter, struct pfi_kif *buf, int *size)
{
struct pfioc_iface io;
if (size == NULL || *size < 0 || (*size && buf == NULL)) {
errno = EINVAL;
return (-1);
}
bzero(&io, sizeof io);
if (filter != NULL)
if (strlcpy(io.pfiio_name, filter, sizeof(io.pfiio_name)) >=
sizeof(io.pfiio_name)) {
errno = EINVAL;
return (-1);
}
io.pfiio_buffer = buf;
io.pfiio_esize = sizeof(*buf);
io.pfiio_size = *size;
if (ioctl(dev, DIOCIGETIFACES, &io))
return (-1);
*size = io.pfiio_size;
return (0);
}
/* buffer management code */
const size_t buf_esize[PFRB_MAX] = { 0,
sizeof(struct pfr_table), sizeof(struct pfr_tstats),
sizeof(struct pfr_addr), sizeof(struct pfr_astats),
sizeof(struct pfi_kif), sizeof(struct pfioc_trans_e)
};
/*
* add one element to the buffer
*/
int
pfr_buf_add(struct pfr_buffer *b, const void *e)
{
size_t bs;
if (b == NULL || b->pfrb_type <= 0 || b->pfrb_type >= PFRB_MAX ||
e == NULL) {
errno = EINVAL;
return (-1);
}
bs = buf_esize[b->pfrb_type];
if (b->pfrb_size == b->pfrb_msize)
if (pfr_buf_grow(b, 0))
return (-1);
memcpy(((caddr_t)b->pfrb_caddr) + bs * b->pfrb_size, e, bs);
b->pfrb_size++;
return (0);
}
/*
* return next element of the buffer (or first one if prev is NULL)
* see PFRB_FOREACH macro
*/
void *
pfr_buf_next(struct pfr_buffer *b, const void *prev)
{
size_t bs;
if (b == NULL || b->pfrb_type <= 0 || b->pfrb_type >= PFRB_MAX)
return (NULL);
if (b->pfrb_size == 0)
return (NULL);
if (prev == NULL)
return (b->pfrb_caddr);
bs = buf_esize[b->pfrb_type];
if ((((caddr_t)prev)-((caddr_t)b->pfrb_caddr)) / bs >= b->pfrb_size-1)
return (NULL);
return (((caddr_t)prev) + bs);
}
/*
* minsize:
* 0: make the buffer somewhat bigger
* n: make room for "n" entries in the buffer
*/
int
pfr_buf_grow(struct pfr_buffer *b, int minsize)
{
caddr_t p;
size_t bs;
if (b == NULL || b->pfrb_type <= 0 || b->pfrb_type >= PFRB_MAX) {
errno = EINVAL;
return (-1);
}
if (minsize != 0 && minsize <= b->pfrb_msize)
return (0);
bs = buf_esize[b->pfrb_type];
if (!b->pfrb_msize) {
if (minsize < 64)
minsize = 64;
b->pfrb_caddr = calloc(bs, minsize);
if (b->pfrb_caddr == NULL)
return (-1);
b->pfrb_msize = minsize;
} else {
if (minsize == 0)
minsize = b->pfrb_msize * 2;
if (minsize < 0 || minsize >= SIZE_T_MAX / bs) {
/* msize overflow */
errno = ENOMEM;
return (-1);
}
p = realloc(b->pfrb_caddr, minsize * bs);
if (p == NULL)
return (-1);
bzero(p + b->pfrb_msize * bs, (minsize - b->pfrb_msize) * bs);
b->pfrb_caddr = p;
b->pfrb_msize = minsize;
}
return (0);
}
/*
* reset buffer and free memory.
*/
void
pfr_buf_clear(struct pfr_buffer *b)
{
if (b == NULL)
return;
if (b->pfrb_caddr != NULL)
free(b->pfrb_caddr);
b->pfrb_caddr = NULL;
b->pfrb_size = b->pfrb_msize = 0;
}
int
pfr_buf_load(struct pfr_buffer *b, char *file, int nonetwork,
int (*append_addr)(struct pfr_buffer *, char *, int))
{
FILE *fp;
char buf[BUF_SIZE];
int rv;
if (file == NULL)
return (0);
if (!strcmp(file, "-"))
fp = stdin;
else {
fp = pfctl_fopen(file, "r");
if (fp == NULL)
return (-1);
}
while ((rv = pfr_next_token(buf, fp)) == 1)
if (append_addr(b, buf, nonetwork)) {
rv = -1;
break;
}
if (fp != stdin)
fclose(fp);
return (rv);
}
int
pfr_next_token(char buf[BUF_SIZE], FILE *fp)
{
static char next_ch = ' ';
int i = 0;
for (;;) {
/* skip spaces */
while (isspace(next_ch) && !feof(fp))
next_ch = fgetc(fp);
/* remove from '#' until end of line */
if (next_ch == '#')
while (!feof(fp)) {
next_ch = fgetc(fp);
if (next_ch == '\n')
break;
}
else
break;
}
if (feof(fp)) {
next_ch = ' ';
return (0);
}
do {
if (i < BUF_SIZE)
buf[i++] = next_ch;
next_ch = fgetc(fp);
} while (!feof(fp) && !isspace(next_ch));
if (i >= BUF_SIZE) {
errno = EINVAL;
return (-1);
}
buf[i] = '\0';
return (1);
}
char *
pfr_strerror(int errnum)
{
switch (errnum) {
case ESRCH:
return "Table does not exist";
case ENOENT:
return "Anchor or Ruleset does not exist";
default:
return strerror(errnum);
}
}