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- /*
- This file is part of GNUnet.
- Copyright (C) 2009-2013 GNUnet e.V.
- GNUnet is free software: you can redistribute it and/or modify it
- under the terms of the GNU Affero General Public License as published
- by the Free Software Foundation, either version 3 of the License,
- or (at your option) any later version.
- GNUnet is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Affero General Public License for more details.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @file gnsrecord/gnsrecord_misc.c
- * @brief MISC functions related to GNS records
- * @author Martin Schanzenbach
- * @author Matthias Wachs
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_constants.h"
- #include "gnunet_signatures.h"
- #include "gnunet_arm_service.h"
- #include "gnunet_gnsrecord_lib.h"
- #include "gnunet_dnsparser_lib.h"
- #include "gnunet_tun_lib.h"
- #define LOG(kind, ...) GNUNET_log_from (kind, "gnsrecord", __VA_ARGS__)
- /**
- * Convert a UTF-8 string to UTF-8 lowercase
- * @param src source string
- * @return converted result
- */
- char *
- GNUNET_GNSRECORD_string_to_lowercase (const char *src)
- {
- char *res;
- res = GNUNET_strdup (src);
- GNUNET_STRINGS_utf8_tolower (src, res);
- return res;
- }
- /**
- * Convert a zone key to a string (for printing debug messages).
- * This is one of the very few calls in the entire API that is
- * NOT reentrant!
- *
- * @param z the zone key
- * @return string form; will be overwritten by next call to #GNUNET_GNSRECORD_z2s
- */
- const char *
- GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z)
- {
- static char buf[sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey) * 8];
- char *end;
- end = GNUNET_STRINGS_data_to_string ((const unsigned char *) z,
- sizeof(struct
- GNUNET_CRYPTO_EcdsaPublicKey),
- buf, sizeof(buf));
- if (NULL == end)
- {
- GNUNET_break (0);
- return NULL;
- }
- *end = '\0';
- return buf;
- }
- /**
- * Compares if two records are equal (ignoring flags such
- * as authority, private and pending, but not relative vs.
- * absolute expiration time).
- *
- * @param a record
- * @param b record
- * @return #GNUNET_YES if the records are equal or #GNUNET_NO if they are not
- */
- int
- GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
- const struct GNUNET_GNSRECORD_Data *b)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Comparing records\n");
- if (a->record_type != b->record_type)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Record type %lu != %lu\n", a->record_type, b->record_type);
- return GNUNET_NO;
- }
- if ((a->expiration_time != b->expiration_time) &&
- ((a->expiration_time != 0) && (b->expiration_time != 0)))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Expiration time %llu != %llu\n",
- a->expiration_time,
- b->expiration_time);
- return GNUNET_NO;
- }
- if ((a->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS)
- != (b->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Flags %lu (%lu) != %lu (%lu)\n", a->flags,
- a->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS, b->flags,
- b->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS);
- return GNUNET_NO;
- }
- if (a->data_size != b->data_size)
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Data size %lu != %lu\n",
- a->data_size,
- b->data_size);
- return GNUNET_NO;
- }
- if (0 != memcmp (a->data, b->data, a->data_size))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Data contents do not match\n");
- return GNUNET_NO;
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Records are equal\n");
- return GNUNET_YES;
- }
- /**
- * Returns the expiration time of the given block of records. The block
- * expiration time is the expiration time of the record with smallest
- * expiration time.
- *
- * @param rd_count number of records given in @a rd
- * @param rd array of records
- * @return absolute expiration time
- */
- struct GNUNET_TIME_Absolute
- GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
- const struct
- GNUNET_GNSRECORD_Data *rd)
- {
- struct GNUNET_TIME_Absolute expire;
- struct GNUNET_TIME_Absolute at;
- struct GNUNET_TIME_Relative rt;
- struct GNUNET_TIME_Absolute at_shadow;
- struct GNUNET_TIME_Relative rt_shadow;
- if (NULL == rd)
- return GNUNET_TIME_UNIT_ZERO_ABS;
- expire = GNUNET_TIME_UNIT_FOREVER_ABS;
- for (unsigned int c = 0; c < rd_count; c++)
- {
- if (0 != (rd[c].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
- {
- rt.rel_value_us = rd[c].expiration_time;
- at = GNUNET_TIME_relative_to_absolute (rt);
- }
- else
- {
- at.abs_value_us = rd[c].expiration_time;
- }
- for (unsigned int c2 = 0; c2 < rd_count; c2++)
- {
- /* Check for shadow record */
- if ((c == c2) ||
- (rd[c].record_type != rd[c2].record_type) ||
- (0 == (rd[c2].flags & GNUNET_GNSRECORD_RF_SHADOW_RECORD)))
- continue;
- /* We have a shadow record */
- if (0 != (rd[c2].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
- {
- rt_shadow.rel_value_us = rd[c2].expiration_time;
- at_shadow = GNUNET_TIME_relative_to_absolute (rt_shadow);
- }
- else
- {
- at_shadow.abs_value_us = rd[c2].expiration_time;
- }
- at = GNUNET_TIME_absolute_max (at,
- at_shadow);
- }
- expire = GNUNET_TIME_absolute_min (at,
- expire);
- }
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Determined expiration time for block with %u records to be %s\n",
- rd_count,
- GNUNET_STRINGS_absolute_time_to_string (expire));
- return expire;
- }
- /**
- * Test if a given record is expired.
- *
- * @return #GNUNET_YES if the record is expired,
- * #GNUNET_NO if not
- */
- int
- GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd)
- {
- struct GNUNET_TIME_Absolute at;
- if (0 != (rd->flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
- return GNUNET_NO;
- at.abs_value_us = rd->expiration_time;
- return (0 == GNUNET_TIME_absolute_get_remaining (at).rel_value_us) ?
- GNUNET_YES : GNUNET_NO;
- }
- /**
- * Convert public key to the respective absolute domain name in the
- * ".zkey" pTLD.
- * This is one of the very few calls in the entire API that is
- * NOT reentrant!
- *
- * @param pkey a public key with a point on the eliptic curve
- * @return string "X.zkey" where X is the public
- * key in an encoding suitable for DNS labels.
- */
- const char *
- GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey)
- {
- static char ret[128];
- char *pkeys;
- pkeys = GNUNET_CRYPTO_ecdsa_public_key_to_string (pkey);
- GNUNET_snprintf (ret,
- sizeof(ret),
- "%s",
- pkeys);
- GNUNET_free (pkeys);
- return ret;
- }
- /**
- * Convert an absolute domain name to the
- * respective public key.
- *
- * @param zkey string encoding the coordinates of the public
- * key in an encoding suitable for DNS labels.
- * @param pkey set to a public key on the eliptic curve
- * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
- */
- int
- GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
- struct GNUNET_CRYPTO_EcdsaPublicKey *pkey)
- {
- if (GNUNET_OK !=
- GNUNET_CRYPTO_ecdsa_public_key_from_string (zkey,
- strlen (zkey),
- pkey))
- return GNUNET_SYSERR;
- return GNUNET_OK;
- }
- /* end of gnsrecord_misc.c */
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