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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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