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highlighter: do not rely on localized case comparisons

This commit is contained in:
Jason A. Donenfeld 2019-01-18 01:27:34 -05:00
parent 919c46af69
commit 6b5b8f3c27
1 changed files with 62 additions and 29 deletions
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91
WireGuard/WireGuard/UI/macOS/highlighter.c
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@ -3,12 +3,10 @@
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <string.h>
#include <strings.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include "highlighter.h"
@ -17,16 +15,56 @@ typedef struct {
size_t len;
} string_span_t;
static bool is_decimal(char c)
{
return c >= '0' && c <= '9';
}
static bool is_hexadecimal(char c)
{
return is_decimal(c) || ((c | 32) >= 'a' && (c | 32) <= 'f');
}
static bool is_alphabet(char c)
{
return (c | 32) >= 'a' && (c | 32) <= 'z';
}
static bool is_same(string_span_t s, const char *c)
{
size_t len = strlen(c);
if (len != s.len)
return false;
return !memcmp(s.s, c, len);
}
static bool is_caseless_same(string_span_t s, const char *c)
{
size_t len = strlen(c);
if (len != s.len)
return false;
for (size_t i = 0; i < len; ++i) {
char a = c[i], b = s.s[i];
if ((unsigned)a - 'a' < 26)
a &= 95;
if ((unsigned)b - 'a' < 26)
b &= 95;
if (a != b)
return false;
}
return true;
}
static bool is_valid_key(string_span_t s)
{
if (s.len != 44 || s.s[43] != '=')
return false;
for (size_t i = 0; i < 43; ++i) {
if (!((s.s[i] >= '/' && s.s[i] <= '9') ||
(s.s[i] >= 'A' && s.s[i] <= 'Z') ||
(s.s[i] >= 'a' && s.s[i] <= 'z') ||
s.s[i] == '+'))
if (!is_decimal(s.s[i]) && !is_alphabet(s.s[i]) &&
s.s[i] != '/' && s.s[i] != '+')
return false;
}
return true;
@ -44,7 +82,7 @@ static bool is_valid_hostname(string_span_t s)
return false;
for (size_t i = 0; i < s.len; ++i) {
if (isdigit(s.s[i])) {
if (is_decimal(s.s[i])) {
++num_digit;
continue;
}
@ -53,9 +91,7 @@ static bool is_valid_hostname(string_span_t s)
continue;
}
if (!((s.s[i] >= 'A' && s.s[i] <= 'Z') ||
(s.s[i] >= 'a' && s.s[i] <= 'z') ||
s.s[i] == '-'))
if (!is_alphabet(s.s[i]) && s.s[i] != '-')
return false;
if (i && s.s[i] == '.' && s.s[i - 1] == '.')
@ -69,7 +105,7 @@ static bool is_valid_ipv4(string_span_t s)
for (size_t j, i = 0, pos = 0; i < 4 && pos < s.len; ++i) {
uint32_t val = 0;
for (j = 0; j < 3 && pos + j < s.len && isdigit(s.s[pos + j]); ++j)
for (j = 0; j < 3 && pos + j < s.len && is_decimal(s.s[pos + j]); ++j)
val = 10 * val + s.s[pos + j] - '0';
if (j == 0 || (j > 1 && s.s[pos] == '0') || val > 255)
return false;
@ -103,7 +139,7 @@ static bool is_valid_ipv6(string_span_t s)
return false;
continue;
}
for (j = 0; j < 4 && pos + j < s.len && isxdigit(s.s[pos + j]); ++j);
for (j = 0; j < 4 && pos + j < s.len && is_hexadecimal(s.s[pos + j]); ++j);
if (j == 0)
return false;
if (pos + j == s.len && (seen_colon || i == 7))
@ -139,7 +175,7 @@ static bool is_valid_uint(string_span_t s, bool support_hex, uint64_t min, uint6
}
} else {
for (size_t i = 0; i < s.len; ++i) {
if (!isdigit(s.s[i]))
if (!is_decimal(s.s[i]))
return false;
val = 10 * val + s.s[i] - '0';
}
@ -159,7 +195,7 @@ static bool is_valid_mtu(string_span_t s)
static bool is_valid_persistentkeepalive(string_span_t s)
{
if (s.len == 3 && !memcmp(s.s, "off", 3))
if (is_same(s, "off"))
return true;
return is_valid_uint(s, false, 0, 65535);
}
@ -168,16 +204,16 @@ static bool is_valid_persistentkeepalive(string_span_t s)
static bool is_valid_fwmark(string_span_t s)
{
if (s.len == 3 && !memcmp(s.s, "off", 3))
if (is_same(s, "off"))
return true;
return is_valid_uint(s, true, 0, 4294967295);
}
static bool is_valid_table(string_span_t s)
{
if (s.len == 4 && !memcmp(s.s, "auto", 3))
if (is_same(s, "auto"))
return true;
if (s.len == 3 && !memcmp(s.s, "off", 3))
if (is_same(s, "off"))
return true;
/* This pretty much invalidates the other checks, but rt_names.c's
* fread_id_name does no validation aside from this. */
@ -188,8 +224,7 @@ static bool is_valid_table(string_span_t s)
static bool is_valid_saveconfig(string_span_t s)
{
return (s.len == 4 && !memcmp(s.s, "true", 4)) ||
(s.len == 5 && !memcmp(s.s, "false", 5));
return is_same(s, "true") || is_same(s, "false");
}
static bool is_valid_prepostupdown(string_span_t s)
@ -205,11 +240,9 @@ static bool is_valid_scope(string_span_t s)
if (s.len > 64 || !s.len)
return false;
for (size_t i = 0; i < s.len; ++i) {
if (!((s.s[i] >= 'A' && s.s[i] <= 'Z') ||
(s.s[i] >= 'a' && s.s[i] <= 'z') ||
isdigit(s.s[i]) || s.s[i] == '_' ||
s.s[i] == '=' || s.s[i] == '+' ||
s.s[i] == '.' || s.s[i] == '-'))
if (!is_alphabet(s.s[i]) && !is_decimal(s.s[i]) &&
s.s[i] != '_' && s.s[i] != '=' && s.s[i] != '+' &&
s.s[i] != '.' && s.s[i] != '-')
return false;
}
return true;
@ -269,7 +302,7 @@ static bool is_valid_network(string_span_t s)
return false;
for (size_t j = 0; j < cidr.len; ++j) {
if (!isdigit(cidr.s[j]))
if (!is_decimal(cidr.s[j]))
return false;
cidrval = 10 * cidrval + cidr.s[j] - '0';
}
@ -323,7 +356,7 @@ static enum field section_for_field(enum field t)
static enum field get_field(string_span_t s)
{
#define check_enum(t) do { if (s.len == strlen(#t) && !strncasecmp(#t, s.s, s.len)) return t; } while (0)
#define check_enum(t) do { if (is_caseless_same(s, #t)) return t; } while (0)
check_enum(PrivateKey);
check_enum(ListenPort);
check_enum(Address);
@ -349,9 +382,9 @@ static enum field get_field(string_span_t s)
static enum field get_sectiontype(string_span_t s)
{
if (s.len == 6 && !strncasecmp("[Peer]", s.s, 6))
if (is_caseless_same(s, "[Peer]"))
return PeerSection;
if (s.len == 11 && !strncasecmp("[Interface]", s.s, 11))
if (is_caseless_same(s, "[Interface]"))
return InterfaceSection;
return Invalid;
}