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