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/* Copyright (c) 2001 Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2019, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file nickname.c
* \brief Check and manipulate relay nicknames.
*/
#include "core/or/or.h"
#include "feature/nodelist/nickname.h"
/** Return true iff <b>s</b> is a valid server nickname. (That is, a string
* containing between 1 and MAX_NICKNAME_LEN characters from
* LEGAL_NICKNAME_CHARACTERS.) */
int
is_legal_nickname(const char *s)
{
size_t len;
tor_assert(s);
len = strlen(s);
return len > 0 && len <= MAX_NICKNAME_LEN &&
strspn(s,LEGAL_NICKNAME_CHARACTERS) == len;
}
/** Return true iff <b>s</b> is a valid server nickname or
* hex-encoded identity-key digest. */
int
is_legal_nickname_or_hexdigest(const char *s)
{
if (*s!='$')
return is_legal_nickname(s);
else
return is_legal_hexdigest(s);
}
/** Return true iff <b>s</b> is a valid hex-encoded identity-key
* digest. (That is, an optional $, followed by 40 hex characters,
* followed by either nothing, or = or ~ followed by a nickname, or
* a character other than =, ~, or a hex character.)
*/
int
is_legal_hexdigest(const char *s)
{
size_t len;
tor_assert(s);
if (s[0] == '$') s++;
len = strlen(s);
if (len > HEX_DIGEST_LEN) {
if (s[HEX_DIGEST_LEN] == '=' ||
s[HEX_DIGEST_LEN] == '~') {
if (!is_legal_nickname(s+HEX_DIGEST_LEN+1))
return 0;
} else {
return 0;
}
}
return (len >= HEX_DIGEST_LEN &&
strspn(s,HEX_CHARACTERS)==HEX_DIGEST_LEN);
}
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