401 lines
11 KiB
C
401 lines
11 KiB
C
|
/**
|
||
|
|
* @file ipaddr6.h
|
||
|
|
* @author Ambroz Bizjak <ambrop7@gmail.com>
|
||
|
|
*
|
||
|
|
* @section LICENSE
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
* 3. Neither the name of the author nor the
|
||
|
|
* names of its contributors may be used to endorse or promote products
|
||
|
|
* derived from this software without specific prior written permission.
|
||
|
|
*
|
||
|
|
* 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 AUTHOR 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.
|
||
|
|
*
|
||
|
|
* @section DESCRIPTION
|
||
|
|
*
|
||
|
|
* IPv6 address parsing functions.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef BADVPN_MISC_IPADDR6_H
|
||
|
|
#define BADVPN_MISC_IPADDR6_H
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <limits.h>
|
||
|
|
|
||
|
|
#include <misc/debug.h>
|
||
|
|
#include <misc/byteorder.h>
|
||
|
|
#include <misc/parse_number.h>
|
||
|
|
#include <misc/find_char.h>
|
||
|
|
#include <misc/print_macros.h>
|
||
|
|
|
||
|
|
struct ipv6_addr {
|
||
|
|
uint8_t bytes[16];
|
||
|
|
};
|
||
|
|
|
||
|
|
struct ipv6_ifaddr {
|
||
|
|
struct ipv6_addr addr;
|
||
|
|
int prefix;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int ipaddr6_parse_ipv6_addr_bin (const char *name, size_t name_len, struct ipv6_addr *out_addr);
|
||
|
|
static int ipaddr6_parse_ipv6_addr (const char *name, struct ipv6_addr *out_addr);
|
||
|
|
static int ipaddr6_parse_ipv6_prefix_bin (const char *str, size_t str_len, int *out_num);
|
||
|
|
static int ipaddr6_parse_ipv6_prefix (const char *str, int *out_num);
|
||
|
|
static int ipaddr6_parse_ipv6_ifaddr_bin (const char *str, size_t str_len, struct ipv6_ifaddr *out);
|
||
|
|
static int ipaddr6_parse_ipv6_ifaddr (const char *str, struct ipv6_ifaddr *out);
|
||
|
|
static int ipaddr6_ipv6_ifaddr_from_addr_mask (struct ipv6_addr addr, struct ipv6_addr mask, struct ipv6_ifaddr *out);
|
||
|
|
static void ipaddr6_ipv6_mask_from_prefix (int prefix, struct ipv6_addr *out_mask);
|
||
|
|
static int ipaddr6_ipv6_prefix_from_mask (struct ipv6_addr mask, int *out_prefix);
|
||
|
|
static int ipaddr6_ipv6_addrs_in_network (struct ipv6_addr addr1, struct ipv6_addr addr2, int netprefix);
|
||
|
|
|
||
|
|
#define IPADDR6_PRINT_MAX 44
|
||
|
|
|
||
|
|
static void ipaddr6_print_addr (struct ipv6_addr addr, char *out_buf);
|
||
|
|
static void ipaddr6_print_ifaddr (struct ipv6_ifaddr addr, char *out_buf);
|
||
|
|
|
||
|
|
int ipaddr6_parse_ipv6_addr_bin (const char *name, size_t name_len, struct ipv6_addr *out_addr)
|
||
|
|
{
|
||
|
|
int num_blocks = 0;
|
||
|
|
int compress_pos = -1;
|
||
|
|
uint16_t block = 0;
|
||
|
|
int empty = 1;
|
||
|
|
|
||
|
|
size_t i = 0;
|
||
|
|
|
||
|
|
while (i < name_len) {
|
||
|
|
if (name[i] == '.') {
|
||
|
|
goto ipv4_ending;
|
||
|
|
} else if (name[i] == ':') {
|
||
|
|
int is_double = (i + 1 < name_len && name[i + 1] == ':');
|
||
|
|
|
||
|
|
if (i > 0) {
|
||
|
|
if (empty || num_blocks == 7) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
out_addr->bytes[2 * num_blocks + 0] = block >> 8;
|
||
|
|
out_addr->bytes[2 * num_blocks + 1] = block & 0xFF;
|
||
|
|
num_blocks++;
|
||
|
|
block = 0;
|
||
|
|
empty = 1;
|
||
|
|
}
|
||
|
|
else if (!is_double) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (is_double) {
|
||
|
|
if (compress_pos != -1) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
compress_pos = num_blocks;
|
||
|
|
}
|
||
|
|
|
||
|
|
i += 1 + is_double;
|
||
|
|
} else {
|
||
|
|
int digit = decode_hex_digit(name[i]);
|
||
|
|
if (digit < 0) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (block > UINT16_MAX / 16) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
block *= 16;
|
||
|
|
if (digit > UINT16_MAX - block) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
block += digit;
|
||
|
|
empty = 0;
|
||
|
|
i += 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!empty) {
|
||
|
|
out_addr->bytes[2 * num_blocks + 0] = block >> 8;
|
||
|
|
out_addr->bytes[2 * num_blocks + 1] = block & 0xFF;
|
||
|
|
num_blocks++;
|
||
|
|
}
|
||
|
|
else if (num_blocks != compress_pos) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
ipv4_done:
|
||
|
|
if (compress_pos == -1) {
|
||
|
|
if (num_blocks != 8) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
compress_pos = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int num_rear = num_blocks - compress_pos;
|
||
|
|
memmove(out_addr->bytes + 2 * (8 - num_rear), out_addr->bytes + 2 * compress_pos, 2 * num_rear);
|
||
|
|
memset(out_addr->bytes + 2 * compress_pos, 0, 2 * (8 - num_rear - compress_pos));
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
|
||
|
|
ipv4_ending:
|
||
|
|
if (empty || (num_blocks == 0 && compress_pos == -1)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (name[i - 1] != ':') {
|
||
|
|
i--;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t bytes[4];
|
||
|
|
int cur_byte = 0;
|
||
|
|
uint8_t byte = 0;
|
||
|
|
empty = 1;
|
||
|
|
|
||
|
|
while (i < name_len) {
|
||
|
|
if (name[i] == '.') {
|
||
|
|
if (empty || cur_byte == 3) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
bytes[cur_byte] = byte;
|
||
|
|
cur_byte++;
|
||
|
|
byte = 0;
|
||
|
|
empty = 1;
|
||
|
|
} else {
|
||
|
|
if (!empty && byte == 0) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
int digit = decode_decimal_digit(name[i]);
|
||
|
|
if (digit < 0) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (byte > UINT8_MAX / 10) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
byte *= 10;
|
||
|
|
if (digit > UINT8_MAX - byte) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
byte += digit;
|
||
|
|
empty = 0;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (cur_byte != 3 || empty) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
bytes[cur_byte] = byte;
|
||
|
|
|
||
|
|
if (8 - num_blocks < 2) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
memcpy(out_addr->bytes + 2 * num_blocks, bytes, 4);
|
||
|
|
num_blocks += 2;
|
||
|
|
|
||
|
|
goto ipv4_done;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_parse_ipv6_addr (const char *name, struct ipv6_addr *out_addr)
|
||
|
|
{
|
||
|
|
return ipaddr6_parse_ipv6_addr_bin(name, strlen(name), out_addr);
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_parse_ipv6_prefix_bin (const char *str, size_t str_len, int *out_num)
|
||
|
|
{
|
||
|
|
uintmax_t d;
|
||
|
|
if (!parse_unsigned_integer_bin(str, str_len, &d)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (d > 128) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
*out_num = d;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_parse_ipv6_prefix (const char *str, int *out_num)
|
||
|
|
{
|
||
|
|
return ipaddr6_parse_ipv6_prefix_bin(str, strlen(str), out_num);
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_parse_ipv6_ifaddr_bin (const char *str, size_t str_len, struct ipv6_ifaddr *out)
|
||
|
|
{
|
||
|
|
size_t slash_pos;
|
||
|
|
if (!b_find_char_bin(str, str_len, '/', &slash_pos)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return (ipaddr6_parse_ipv6_addr_bin(str, slash_pos, &out->addr) &&
|
||
|
|
ipaddr6_parse_ipv6_prefix_bin(str + slash_pos + 1, str_len - slash_pos - 1, &out->prefix));
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_parse_ipv6_ifaddr (const char *str, struct ipv6_ifaddr *out)
|
||
|
|
{
|
||
|
|
return ipaddr6_parse_ipv6_ifaddr_bin(str, strlen(str), out);
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_ipv6_ifaddr_from_addr_mask (struct ipv6_addr addr, struct ipv6_addr mask, struct ipv6_ifaddr *out)
|
||
|
|
{
|
||
|
|
int prefix;
|
||
|
|
if (!ipaddr6_ipv6_prefix_from_mask(mask, &prefix)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
out->addr = addr;
|
||
|
|
out->prefix = prefix;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
void ipaddr6_ipv6_mask_from_prefix (int prefix, struct ipv6_addr *out_mask)
|
||
|
|
{
|
||
|
|
ASSERT(prefix >= 0)
|
||
|
|
ASSERT(prefix <= 128)
|
||
|
|
|
||
|
|
int quot = prefix / 8;
|
||
|
|
int rem = prefix % 8;
|
||
|
|
|
||
|
|
if (quot > 0) {
|
||
|
|
memset(out_mask->bytes, UINT8_MAX, quot);
|
||
|
|
}
|
||
|
|
if (16 - quot > 0) {
|
||
|
|
memset(out_mask->bytes + quot, 0, 16 - quot);
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int i = 0; i < rem; i++) {
|
||
|
|
out_mask->bytes[quot] |= (uint8_t)1 << (8 - i - 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_ipv6_prefix_from_mask (struct ipv6_addr mask, int *out_prefix)
|
||
|
|
{
|
||
|
|
int prefix = 0;
|
||
|
|
int i = 0;
|
||
|
|
|
||
|
|
while (i < 16 && mask.bytes[i] == UINT8_MAX) {
|
||
|
|
prefix += 8;
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (i < 16) {
|
||
|
|
uint8_t t = 0;
|
||
|
|
int j;
|
||
|
|
for (j = 0; j <= 8; j++) {
|
||
|
|
if (mask.bytes[i] == t) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (j < 8) {
|
||
|
|
t |= ((uint8_t)1 << (8 - j - 1));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!(j <= 8)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
prefix += j;
|
||
|
|
i++;
|
||
|
|
|
||
|
|
while (i < 16) {
|
||
|
|
if (mask.bytes[i] != 0) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
i++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
*out_prefix = prefix;
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int ipaddr6_ipv6_addrs_in_network (struct ipv6_addr addr1, struct ipv6_addr addr2, int netprefix)
|
||
|
|
{
|
||
|
|
ASSERT(netprefix >= 0)
|
||
|
|
ASSERT(netprefix <= 128)
|
||
|
|
|
||
|
|
int quot = netprefix / 8;
|
||
|
|
int rem = netprefix % 8;
|
||
|
|
|
||
|
|
if (memcmp(addr1.bytes, addr2.bytes, quot)) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (rem == 0) {
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint8_t t = 0;
|
||
|
|
for (int i = 0; i < rem; i++) {
|
||
|
|
t |= (uint8_t)1 << (8 - i - 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
return ((addr1.bytes[quot] & t) == (addr2.bytes[quot] & t));
|
||
|
|
}
|
||
|
|
|
||
|
|
void ipaddr6_print_addr (struct ipv6_addr addr, char *out_buf)
|
||
|
|
{
|
||
|
|
int largest_start = 0;
|
||
|
|
int largest_len = 0;
|
||
|
|
int current_start = 0;
|
||
|
|
int current_len = 0;
|
||
|
|
|
||
|
|
for (int i = 0; i < 8; i++) {
|
||
|
|
if (addr.bytes[2 * i] == 0 && addr.bytes[2 * i + 1] == 0) {
|
||
|
|
current_len++;
|
||
|
|
if (current_len > largest_len) {
|
||
|
|
largest_start = current_start;
|
||
|
|
largest_len = current_len;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
current_start = i + 1;
|
||
|
|
current_len = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (largest_len > 1) {
|
||
|
|
for (int i = 0; i < largest_start; i++) {
|
||
|
|
uint16_t block = ((uint16_t)addr.bytes[2 * i] << 8) | addr.bytes[2 * i + 1];
|
||
|
|
out_buf += sprintf(out_buf, "%"PRIx16":", block);
|
||
|
|
}
|
||
|
|
if (largest_start == 0) {
|
||
|
|
out_buf += sprintf(out_buf, ":");
|
||
|
|
}
|
||
|
|
|
||
|
|
for (int i = largest_start + largest_len; i < 8; i++) {
|
||
|
|
uint16_t block = ((uint16_t)addr.bytes[2 * i] << 8) | addr.bytes[2 * i + 1];
|
||
|
|
out_buf += sprintf(out_buf, ":%"PRIx16, block);
|
||
|
|
}
|
||
|
|
if (largest_start + largest_len == 8) {
|
||
|
|
out_buf += sprintf(out_buf, ":");
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
const char *prefix = "";
|
||
|
|
for (int i = 0; i < 8; i++) {
|
||
|
|
uint16_t block = ((uint16_t)addr.bytes[2 * i] << 8) | addr.bytes[2 * i + 1];
|
||
|
|
out_buf += sprintf(out_buf, "%s%"PRIx16, prefix, block);
|
||
|
|
prefix = ":";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void ipaddr6_print_ifaddr (struct ipv6_ifaddr addr, char *out_buf)
|
||
|
|
{
|
||
|
|
ASSERT(addr.prefix >= 0)
|
||
|
|
ASSERT(addr.prefix <= 128)
|
||
|
|
|
||
|
|
ipaddr6_print_addr(addr.addr, out_buf);
|
||
|
|
sprintf(out_buf + strlen(out_buf), "/%d", addr.prefix);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|