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check a length when validating an email

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An email address has two parts:
 - the local part (before the "@") = max 64 characters
 - the domain part (after the "@") = max 255 characters
So maximum length is 64 + @ + 255 = 320 characters

https://www.rfc-editor.org/rfc/rfc5321.html#section-4.5.3.1
This commit is contained in:
Tomasz Sowa
2024-09-08 02:05:43 +02:00
parent 8634716aa7
commit a6ca71b131
1 changed files with 20 additions and 10 deletions
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30
winixd/core/misc.cpp
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@@ -5,7 +5,7 @@
*/ */
/* /*
* Copyright (c) 2008-2023, Tomasz Sowa * Copyright (c) 2008-2024, Tomasz Sowa
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
@@ -820,25 +820,35 @@ return correct;
bool ValidateEmail(const wchar_t * email) bool ValidateEmail(const wchar_t * email)
{ {
int at = 0; // how many '@' int at = 0; // how many '@'
int dots_after_at = 0; // how many dots in the domain part int dots_after_at = 0; // how many dots in the domain part
const size_t address_max_length = 64; // the max length before a '@'
const size_t domain_max_length = 255; // the max length after a '@'
size_t address_length = 0;
size_t domain_length = 0;
for(size_t i=0 ; email[i] != 0 ; ++i) for(size_t i=0 ; email[i] != 0 ; ++i)
{ {
if( !IsEmailCorrectChar(email[i]) ) if( !IsEmailCorrectChar(email[i]) )
return false; return false;
if( email[i] == '@' ) if( email[i] == '@' )
{
++at; ++at;
}
else
{
if( at == 0 )
address_length += 1;
else
domain_length += 1;
if( email[i] == '.' && at > 0 ) if( email[i] == '.' && at > 0 )
++dots_after_at; ++dots_after_at;
}
} }
if( at != 1 || dots_after_at == 0 ) return at == 1 && dots_after_at > 0 && address_length <= address_max_length && domain_length <= domain_max_length;
return false;
return true;
} }