621 lines
16 KiB
C
621 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "highlighter.h"
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typedef struct {
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const char *s;
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size_t len;
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} string_span_t;
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static bool is_decimal(char c)
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{
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return c >= '0' && c <= '9';
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}
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static bool is_hexadecimal(char c)
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{
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return is_decimal(c) || ((c | 32) >= 'a' && (c | 32) <= 'f');
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}
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static bool is_alphabet(char c)
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{
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return (c | 32) >= 'a' && (c | 32) <= 'z';
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}
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static bool is_same(string_span_t s, const char *c)
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{
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size_t len = strlen(c);
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if (len != s.len)
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return false;
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return !memcmp(s.s, c, len);
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}
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static bool is_caseless_same(string_span_t s, const char *c)
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{
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size_t len = strlen(c);
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if (len != s.len)
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return false;
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for (size_t i = 0; i < len; ++i) {
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char a = c[i], b = s.s[i];
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if ((unsigned)a - 'a' < 26)
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a &= 95;
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if ((unsigned)b - 'a' < 26)
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b &= 95;
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if (a != b)
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return false;
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}
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return true;
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}
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static bool is_valid_key(string_span_t s)
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{
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if (s.len != 44 || s.s[43] != '=')
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return false;
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for (size_t i = 0; i < 43; ++i) {
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if (!is_decimal(s.s[i]) && !is_alphabet(s.s[i]) &&
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s.s[i] != '/' && s.s[i] != '+')
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return false;
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}
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return true;
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}
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static bool is_valid_hostname(string_span_t s)
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{
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size_t num_digit = 0, num_entity = s.len;
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if (s.len > 63 || !s.len)
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return false;
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if (s.s[0] == '-' || s.s[s.len - 1] == '-')
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return false;
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if (s.s[0] == '.' || s.s[s.len - 1] == '.')
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return false;
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for (size_t i = 0; i < s.len; ++i) {
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if (is_decimal(s.s[i])) {
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++num_digit;
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continue;
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}
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if (s.s[i] == '.') {
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--num_entity;
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continue;
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}
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if (!is_alphabet(s.s[i]) && s.s[i] != '-')
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return false;
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if (i && s.s[i] == '.' && s.s[i - 1] == '.')
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return false;
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}
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return num_digit != num_entity;
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}
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static bool is_valid_ipv4(string_span_t s)
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{
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for (size_t j, i = 0, pos = 0; i < 4 && pos < s.len; ++i) {
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uint32_t val = 0;
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for (j = 0; j < 3 && pos + j < s.len && is_decimal(s.s[pos + j]); ++j)
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val = 10 * val + s.s[pos + j] - '0';
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if (j == 0 || (j > 1 && s.s[pos] == '0') || val > 255)
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return false;
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if (pos + j == s.len && i == 3)
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return true;
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if (s.s[pos + j] != '.')
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return false;
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pos += j + 1;
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}
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return false;
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}
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static bool is_valid_ipv6(string_span_t s)
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{
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size_t pos = 0;
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bool seen_colon = false;
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if (s.len < 2)
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return false;
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if (s.s[pos] == ':' && s.s[++pos] != ':')
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return false;
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if (s.s[s.len - 1] == ':' && s.s[s.len - 2] != ':')
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return false;
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for (size_t j, i = 0; pos < s.len; ++i) {
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if (s.s[pos] == ':' && !seen_colon) {
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seen_colon = true;
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if (++pos == s.len)
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break;
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if (i == 7)
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return false;
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continue;
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}
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for (j = 0; j < 4 && pos + j < s.len && is_hexadecimal(s.s[pos + j]); ++j);
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if (j == 0)
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return false;
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if (pos + j == s.len && (seen_colon || i == 7))
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break;
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if (i == 7)
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return false;
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if (s.s[pos + j] != ':') {
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if (s.s[pos + j] != '.' || (i < 6 && !seen_colon))
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return false;
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return is_valid_ipv4((string_span_t){ s.s + pos, s.len - pos });
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}
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pos += j + 1;
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}
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return true;
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}
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static bool is_valid_uint(string_span_t s, bool support_hex, uint64_t min, uint64_t max)
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{
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uint64_t val = 0;
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/* Bound this around 32 bits, so that we don't have to write overflow logic. */
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if (s.len > 10 || !s.len)
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return false;
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if (support_hex && s.len > 2 && s.s[0] == '0' && s.s[1] == 'x') {
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for (size_t i = 2; i < s.len; ++i) {
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if ((unsigned)s.s[i] - '0' < 10)
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val = 16 * val + (s.s[i] - '0');
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else if (((unsigned)s.s[i] | 32) - 'a' < 6)
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val = 16 * val + (s.s[i] | 32) - 'a' + 10;
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else
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return false;
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}
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} else {
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for (size_t i = 0; i < s.len; ++i) {
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if (!is_decimal(s.s[i]))
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return false;
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val = 10 * val + s.s[i] - '0';
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}
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}
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return val <= max && val >= min;
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}
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static bool is_valid_port(string_span_t s)
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{
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return is_valid_uint(s, false, 0, 65535);
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}
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static bool is_valid_mtu(string_span_t s)
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{
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return is_valid_uint(s, false, 576, 65535);
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}
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static bool is_valid_persistentkeepalive(string_span_t s)
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{
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if (is_same(s, "off"))
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return true;
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return is_valid_uint(s, false, 0, 65535);
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}
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#ifndef MOBILE_WGQUICK_SUBSET
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static bool is_valid_fwmark(string_span_t s)
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{
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if (is_same(s, "off"))
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return true;
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return is_valid_uint(s, true, 0, 4294967295);
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}
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static bool is_valid_table(string_span_t s)
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{
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if (is_same(s, "auto"))
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return true;
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if (is_same(s, "off"))
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return true;
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/* This pretty much invalidates the other checks, but rt_names.c's
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* fread_id_name does no validation aside from this. */
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if (s.len < 512)
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return true;
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return is_valid_uint(s, false, 0, 4294967295);
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}
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static bool is_valid_saveconfig(string_span_t s)
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{
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return is_same(s, "true") || is_same(s, "false");
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}
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static bool is_valid_prepostupdown(string_span_t s)
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{
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/* It's probably not worthwhile to try to validate a bash expression.
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* So instead we just demand non-zero length. */
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return s.len;
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}
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#endif
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static bool is_valid_scope(string_span_t s)
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{
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if (s.len > 64 || !s.len)
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return false;
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for (size_t i = 0; i < s.len; ++i) {
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if (!is_alphabet(s.s[i]) && !is_decimal(s.s[i]) &&
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s.s[i] != '_' && s.s[i] != '=' && s.s[i] != '+' &&
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s.s[i] != '.' && s.s[i] != '-')
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return false;
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}
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return true;
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}
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static bool is_valid_endpoint(string_span_t s)
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{
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if (!s.len)
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return false;
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if (s.s[0] == '[') {
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bool seen_scope = false;
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string_span_t hostspan = { s.s + 1, 0 };
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for (size_t i = 1; i < s.len; ++i) {
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if (s.s[i] == '%') {
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if (seen_scope)
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return false;
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seen_scope = true;
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if (!is_valid_ipv6(hostspan))
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return false;
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hostspan = (string_span_t){ s.s + i + 1, 0 };
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} else if (s.s[i] == ']') {
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if (seen_scope) {
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if (!is_valid_scope(hostspan))
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return false;
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} else if (!is_valid_ipv6(hostspan)) {
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return false;
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}
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if (i == s.len - 1 || s.s[i + 1] != ':')
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return false;
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return is_valid_port((string_span_t){ s.s + i + 2, s.len - i - 2 });
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} else {
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++hostspan.len;
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}
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}
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return false;
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}
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for (size_t i = 0; i < s.len; ++i) {
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if (s.s[i] == ':') {
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string_span_t host = { s.s, i }, port = { s.s + i + 1, s.len - i - 1};
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return is_valid_port(port) && (is_valid_ipv4(host) || is_valid_hostname(host));
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}
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}
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return false;
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}
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static bool is_valid_network(string_span_t s)
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{
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for (size_t i = 0; i < s.len; ++i) {
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if (s.s[i] == '/') {
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string_span_t ip = { s.s, i }, cidr = { s.s + i + 1, s.len - i - 1};
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uint16_t cidrval = 0;
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if (cidr.len > 3 || !cidr.len)
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return false;
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for (size_t j = 0; j < cidr.len; ++j) {
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if (!is_decimal(cidr.s[j]))
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return false;
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cidrval = 10 * cidrval + cidr.s[j] - '0';
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}
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if (is_valid_ipv4(ip))
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return cidrval <= 32;
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else if (is_valid_ipv6(ip))
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return cidrval <= 128;
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return false;
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}
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}
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return is_valid_ipv4(s) || is_valid_ipv6(s);
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}
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static bool is_valid_dns(string_span_t s)
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{
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return is_valid_ipv4(s) || is_valid_ipv6(s);
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}
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enum field {
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InterfaceSection,
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PrivateKey,
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ListenPort,
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Address,
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DNS,
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MTU,
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#ifndef MOBILE_WGQUICK_SUBSET
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FwMark,
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Table,
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PreUp, PostUp, PreDown, PostDown,
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SaveConfig,
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#endif
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PeerSection,
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PublicKey,
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PresharedKey,
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AllowedIPs,
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Endpoint,
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PersistentKeepalive,
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Invalid
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};
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static enum field section_for_field(enum field t)
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{
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if (t > InterfaceSection && t < PeerSection)
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return InterfaceSection;
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if (t > PeerSection && t < Invalid)
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return PeerSection;
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return Invalid;
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}
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static enum field get_field(string_span_t s)
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{
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#define check_enum(t) do { if (is_caseless_same(s, #t)) return t; } while (0)
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check_enum(PrivateKey);
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check_enum(ListenPort);
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check_enum(Address);
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check_enum(DNS);
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check_enum(MTU);
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check_enum(PublicKey);
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check_enum(PresharedKey);
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check_enum(AllowedIPs);
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check_enum(Endpoint);
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check_enum(PersistentKeepalive);
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#ifndef MOBILE_WGQUICK_SUBSET
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check_enum(FwMark);
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check_enum(Table);
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check_enum(PreUp);
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check_enum(PostUp);
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check_enum(PreDown);
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check_enum(PostDown);
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check_enum(SaveConfig);
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#endif
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return Invalid;
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#undef check_enum
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}
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static enum field get_sectiontype(string_span_t s)
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{
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if (is_caseless_same(s, "[Peer]"))
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return PeerSection;
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if (is_caseless_same(s, "[Interface]"))
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return InterfaceSection;
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return Invalid;
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}
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struct highlight_span_array {
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size_t len, capacity;
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struct highlight_span *spans;
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};
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/* A useful OpenBSD-ism. */
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static void *realloc_array(void *optr, size_t nmemb, size_t size)
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{
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if ((nmemb >= (size_t)1 << (sizeof(size_t) * 4) ||
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size >= (size_t)1 << (sizeof(size_t) * 4)) &&
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nmemb > 0 && SIZE_MAX / nmemb < size) {
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errno = ENOMEM;
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return NULL;
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}
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return realloc(optr, size * nmemb);
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}
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static bool append_highlight_span(struct highlight_span_array *a, const char *o, string_span_t s, enum highlight_type t)
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{
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if (!s.len)
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return true;
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if (a->len >= a->capacity) {
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struct highlight_span *resized;
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a->capacity = a->capacity ? a->capacity * 2 : 64;
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resized = realloc_array(a->spans, a->capacity, sizeof(*resized));
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if (!resized) {
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free(a->spans);
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memset(a, 0, sizeof(*a));
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return false;
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}
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a->spans = resized;
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}
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a->spans[a->len++] = (struct highlight_span){ t, s.s - o, s.len };
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return true;
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}
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static void highlight_multivalue_value(struct highlight_span_array *ret, const string_span_t parent, const string_span_t s, enum field section)
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{
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switch (section) {
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case DNS:
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append_highlight_span(ret, parent.s, s, is_valid_dns(s) ? HighlightIP : HighlightError);
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break;
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case Address:
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case AllowedIPs: {
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size_t slash;
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if (!is_valid_network(s)) {
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append_highlight_span(ret, parent.s, s, HighlightError);
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break;
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}
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for (slash = 0; slash < s.len; ++slash) {
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if (s.s[slash] == '/')
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break;
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}
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if (slash == s.len) {
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append_highlight_span(ret, parent.s, s, HighlightIP);
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} else {
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append_highlight_span(ret, parent.s, (string_span_t){ s.s, slash }, HighlightIP);
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append_highlight_span(ret, parent.s, (string_span_t){ s.s + slash, 1 }, HighlightDelimiter);
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append_highlight_span(ret, parent.s, (string_span_t){ s.s + slash + 1, s.len - slash - 1 }, HighlightCidr);
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}
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break;
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}
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default:
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append_highlight_span(ret, parent.s, s, HighlightError);
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}
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}
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static void highlight_multivalue(struct highlight_span_array *ret, const string_span_t parent, const string_span_t s, enum field section)
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{
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string_span_t current_span = { s.s, 0 };
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size_t len_at_last_space = 0;
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for (size_t i = 0; i < s.len; ++i) {
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if (s.s[i] == ',') {
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current_span.len = len_at_last_space;
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highlight_multivalue_value(ret, parent, current_span, section);
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append_highlight_span(ret, parent.s, (string_span_t){ s.s + i, 1 }, HighlightDelimiter);
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len_at_last_space = 0;
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current_span = (string_span_t){ s.s + i + 1, 0 };
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} else if (s.s[i] == ' ' || s.s[i] == '\t') {
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if (&s.s[i] == current_span.s && !current_span.len)
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++current_span.s;
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else
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++current_span.len;
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} else {
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len_at_last_space = ++current_span.len;
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}
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}
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current_span.len = len_at_last_space;
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if (current_span.len)
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highlight_multivalue_value(ret, parent, current_span, section);
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else if (ret->spans[ret->len - 1].type == HighlightDelimiter)
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ret->spans[ret->len - 1].type = HighlightError;
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}
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static void highlight_value(struct highlight_span_array *ret, const string_span_t parent, const string_span_t s, enum field section)
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{
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switch (section) {
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case PrivateKey:
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append_highlight_span(ret, parent.s, s, is_valid_key(s) ? HighlightPrivateKey : HighlightError);
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break;
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case PublicKey:
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append_highlight_span(ret, parent.s, s, is_valid_key(s) ? HighlightPublicKey : HighlightError);
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break;
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case PresharedKey:
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append_highlight_span(ret, parent.s, s, is_valid_key(s) ? HighlightPresharedKey : HighlightError);
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break;
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case MTU:
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append_highlight_span(ret, parent.s, s, is_valid_mtu(s) ? HighlightMTU : HighlightError);
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break;
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#ifndef MOBILE_WGQUICK_SUBSET
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case SaveConfig:
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append_highlight_span(ret, parent.s, s, is_valid_saveconfig(s) ? HighlightSaveConfig : HighlightError);
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break;
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case FwMark:
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append_highlight_span(ret, parent.s, s, is_valid_fwmark(s) ? HighlightFwMark : HighlightError);
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break;
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case Table:
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append_highlight_span(ret, parent.s, s, is_valid_table(s) ? HighlightTable : HighlightError);
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break;
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case PreUp:
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case PostUp:
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case PreDown:
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case PostDown:
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append_highlight_span(ret, parent.s, s, is_valid_prepostupdown(s) ? HighlightCmd : HighlightError);
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break;
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#endif
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case ListenPort:
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append_highlight_span(ret, parent.s, s, is_valid_port(s) ? HighlightPort : HighlightError);
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break;
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case PersistentKeepalive:
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append_highlight_span(ret, parent.s, s, is_valid_persistentkeepalive(s) ? HighlightKeepalive : HighlightError);
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break;
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case Endpoint: {
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size_t colon;
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if (!is_valid_endpoint(s)) {
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append_highlight_span(ret, parent.s, s, HighlightError);
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break;
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}
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for (colon = s.len; colon --> 0;) {
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if (s.s[colon] == ':')
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break;
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}
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append_highlight_span(ret, parent.s, (string_span_t){ s.s, colon }, HighlightHost);
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append_highlight_span(ret, parent.s, (string_span_t){ s.s + colon, 1 }, HighlightDelimiter);
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append_highlight_span(ret, parent.s, (string_span_t){ s.s + colon + 1, s.len - colon - 1 }, HighlightPort);
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break;
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}
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case Address:
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case DNS:
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case AllowedIPs:
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highlight_multivalue(ret, parent, s, section);
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break;
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default:
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append_highlight_span(ret, parent.s, s, HighlightError);
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}
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}
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struct highlight_span *highlight_config(const char *config)
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{
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struct highlight_span_array ret = { 0 };
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const string_span_t s = { config, strlen(config) };
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string_span_t current_span = { s.s, 0 };
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enum field current_section = Invalid, current_field = Invalid;
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enum { OnNone, OnKey, OnValue, OnComment, OnSection } state = OnNone;
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size_t len_at_last_space = 0, equals_location = 0;
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for (size_t i = 0; i <= s.len; ++i) {
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if (i == s.len || s.s[i] == '\n' || (state != OnComment && s.s[i] == '#')) {
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if (state == OnKey) {
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current_span.len = len_at_last_space;
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append_highlight_span(&ret, s.s, current_span, HighlightError);
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} else if (state == OnValue) {
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if (current_span.len) {
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append_highlight_span(&ret, s.s, (string_span_t){ s.s + equals_location, 1 }, HighlightDelimiter);
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current_span.len = len_at_last_space;
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highlight_value(&ret, s, current_span, current_field);
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} else {
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append_highlight_span(&ret, s.s, (string_span_t){ s.s + equals_location, 1 }, HighlightError);
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}
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} else if (state == OnSection) {
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current_span.len = len_at_last_space;
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current_section = get_sectiontype(current_span);
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append_highlight_span(&ret, s.s, current_span, current_section == Invalid ? HighlightError : HighlightSection);
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} else if (state == OnComment) {
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append_highlight_span(&ret, s.s, current_span, HighlightComment);
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}
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if (i == s.len)
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break;
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|
len_at_last_space = 0;
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current_field = Invalid;
|
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if (s.s[i] == '#') {
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current_span = (string_span_t){ s.s + i, 1 };
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state = OnComment;
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} else {
|
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current_span = (string_span_t){ s.s + i + 1, 0 };
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state = OnNone;
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}
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} else if (state == OnComment) {
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++current_span.len;
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} else if (s.s[i] == ' ' || s.s[i] == '\t') {
|
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if (&s.s[i] == current_span.s && !current_span.len)
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++current_span.s;
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else
|
|
++current_span.len;
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} else if (s.s[i] == '=' && state == OnKey) {
|
|
current_span.len = len_at_last_space;
|
|
current_field = get_field(current_span);
|
|
enum field section = section_for_field(current_field);
|
|
if (section == Invalid || current_field == Invalid || section != current_section)
|
|
append_highlight_span(&ret, s.s, current_span, HighlightError);
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else
|
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append_highlight_span(&ret, s.s, current_span, HighlightField);
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equals_location = i;
|
|
current_span = (string_span_t){ s.s + i + 1, 0 };
|
|
state = OnValue;
|
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} else {
|
|
if (state == OnNone)
|
|
state = s.s[i] == '[' ? OnSection : OnKey;
|
|
len_at_last_space = ++current_span.len;
|
|
}
|
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}
|
|
|
|
append_highlight_span(&ret, s.s, (string_span_t){ s.s, -1 }, HighlightEnd);
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return ret.spans;
|
|
}
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