security-and-privacy/gnupg
security-and-privacy/gnupg
1
0
Fork 0
mirror of git://git.gnupg.org/gnupg.git synced 2025-07-03 22:56:33 +02:00
Code Activity

common: New function to validate domain names.

Browse source 
* common/mbox-util.c (is_valid_domain_name): New.
* common/t-mbox-util.c (run_dns_test): New test.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2018-07-27 11:56:06 +02:00
parent 967d3649d2
commit ddee9f9409
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
3 changed files with 93 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

39
common/mbox-util.c
View file

@ -241,3 +241,42 @@ is_valid_user_id (const char *uid)
return 1;
}
/* Returns true if STRING is a valid domain name according to the LDH
* rule. */
int
is_valid_domain_name (const char *string)
{
static char const ldh_chars[] =
"01234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-";
const char *s;
/* Note that we do not check the length limit of a label or the
* entire name */
for (s=string; *s; s++)
if (*s == '.')
{
if (string == s)
return 0; /* Dot at the start of the string. */
/* (may also be at the end like in ".") */
if (s[1] == '.')
return 0; /* No - double dot. */
}
else if (!strchr (ldh_chars, *s))
return 0;
else if (*s == '-')
{
if (string == s)
return 0; /* Leading hyphen. */
if (s[-1] == '.')
return 0; /* Hyphen at begin of a label. */
if (s[1] == '.')
return 0; /* Hyphen at start of a label. */
if (!s[1])
return 0; /* Trailing hyphen. */
}
return !!*string;
}