2 This file is part of GNUnet.
3 (C) 2009-2013 Christian Grothoff (and other contributing authors)
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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22 * @file gnsrecord/gnsrecord_misc.c
23 * @brief MISC functions related to GNS records
24 * @author Martin Schanzenbach
25 * @author Matthias Wachs
26 * @author Christian Grothoff
29 #include "gnunet_util_lib.h"
30 #include "gnunet_constants.h"
31 #include "gnunet_signatures.h"
32 #include "gnunet_arm_service.h"
33 #include "gnunet_gnsrecord_lib.h"
34 #include "gnunet_dnsparser_lib.h"
35 #include "gnunet_tun_lib.h"
38 #define LOG(kind,...) GNUNET_log_from (kind, "gnsrecord",__VA_ARGS__)
41 * Convert a UTF-8 string to UTF-8 lowercase
42 * @param src source string
43 * @return converted result
46 GNUNET_GNSRECORD_string_to_lowercase (const char *src)
50 res = GNUNET_strdup (src);
51 GNUNET_STRINGS_utf8_tolower (src, res);
57 * Convert a zone key to a string (for printing debug messages).
58 * This is one of the very few calls in the entire API that is
61 * @param z the zone key
62 * @return string form; will be overwritten by next call to #GNUNET_GNSRECORD_z2s
65 GNUNET_GNSRECORD_z2s (const struct GNUNET_CRYPTO_EcdsaPublicKey *z)
67 static char buf[sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) * 8];
70 end = GNUNET_STRINGS_data_to_string ((const unsigned char *) z,
71 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
84 * Compares if two records are equal (ignoring flags such
85 * as authority, private and pending, but not relative vs.
86 * absolute expiration time).
90 * @return #GNUNET_YES if the records are equal or #GNUNET_NO if they are not
93 GNUNET_GNSRECORD_records_cmp (const struct GNUNET_GNSRECORD_Data *a,
94 const struct GNUNET_GNSRECORD_Data *b)
96 LOG (GNUNET_ERROR_TYPE_DEBUG,
97 "Comparing records\n");
98 if (a->record_type != b->record_type)
100 LOG (GNUNET_ERROR_TYPE_DEBUG,
101 "Record type %lu != %lu\n", a->record_type, b->record_type);
104 if ((a->expiration_time != b->expiration_time) &&
105 ((a->expiration_time != 0) && (b->expiration_time != 0)))
107 LOG (GNUNET_ERROR_TYPE_DEBUG,
108 "Expiration time %llu != %llu\n",
113 if ((a->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS)
114 != (b->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS))
116 LOG (GNUNET_ERROR_TYPE_DEBUG,
117 "Flags %lu (%lu) != %lu (%lu)\n", a->flags,
118 a->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS, b->flags,
119 b->flags & GNUNET_GNSRECORD_RF_RCMP_FLAGS);
122 if (a->data_size != b->data_size)
124 LOG (GNUNET_ERROR_TYPE_DEBUG,
125 "Data size %lu != %lu\n",
130 if (0 != memcmp (a->data, b->data, a->data_size))
132 LOG (GNUNET_ERROR_TYPE_DEBUG,
133 "Data contents do not match\n");
136 LOG (GNUNET_ERROR_TYPE_DEBUG,
137 "Records are equal\n");
143 * Returns the expiration time of the given block of records. The block
144 * expiration time is the expiration time of the record with smallest
147 * @param rd_count number of records given in @a rd
148 * @param rd array of records
149 * @return absolute expiration time
151 struct GNUNET_TIME_Absolute
152 GNUNET_GNSRECORD_record_get_expiration_time (unsigned int rd_count,
153 const struct GNUNET_GNSRECORD_Data *rd)
157 struct GNUNET_TIME_Absolute expire;
158 struct GNUNET_TIME_Absolute at;
159 struct GNUNET_TIME_Relative rt;
160 struct GNUNET_TIME_Absolute at_shadow;
161 struct GNUNET_TIME_Relative rt_shadow;
164 return GNUNET_TIME_UNIT_ZERO_ABS;
165 expire = GNUNET_TIME_UNIT_FOREVER_ABS;
166 for (c = 0; c < rd_count; c++)
168 if (0 != (rd[c].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
170 rt.rel_value_us = rd[c].expiration_time;
171 at = GNUNET_TIME_relative_to_absolute (rt);
175 at.abs_value_us = rd[c].expiration_time;
178 for (c2 = 0; c2 < rd_count; c2++)
180 /* Check for shadow record */
182 (rd[c].record_type != rd[c2].record_type) ||
183 (0 == (rd[c2].flags & GNUNET_GNSRECORD_RF_SHADOW_RECORD)))
185 /* We have a shadow record */
186 if (0 != (rd[c2].flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
188 rt_shadow.rel_value_us = rd[2].expiration_time;
189 at_shadow = GNUNET_TIME_relative_to_absolute (rt_shadow);
193 at_shadow.abs_value_us = rd[c2].expiration_time;
195 at = GNUNET_TIME_absolute_max (at, at_shadow);
197 expire = GNUNET_TIME_absolute_min (at, expire);
199 LOG (GNUNET_ERROR_TYPE_DEBUG,
200 "Determined expiration time for block with %u records to be %s\n",
202 GNUNET_STRINGS_absolute_time_to_string (expire));
208 * Test if a given record is expired.
210 * @return #GNUNET_YES if the record is expired,
214 GNUNET_GNSRECORD_is_expired (const struct GNUNET_GNSRECORD_Data *rd)
216 struct GNUNET_TIME_Absolute at;
218 if (0 != (rd->flags & GNUNET_GNSRECORD_RF_RELATIVE_EXPIRATION))
220 at.abs_value_us = rd->expiration_time;
221 return (0 == GNUNET_TIME_absolute_get_remaining (at).rel_value_us) ? GNUNET_YES : GNUNET_NO;
226 * Convert public key to the respective absolute domain name in the
228 * This is one of the very few calls in the entire API that is
231 * @param pkey a public key with a point on the eliptic curve
232 * @return string "X.zkey" where X is the public
233 * key in an encoding suitable for DNS labels.
236 GNUNET_GNSRECORD_pkey_to_zkey (const struct GNUNET_CRYPTO_EcdsaPublicKey *pkey)
238 static char ret[128];
241 pkeys = GNUNET_CRYPTO_ecdsa_public_key_to_string (pkey);
242 GNUNET_snprintf (ret,
252 * Convert an absolute domain name in the ".zkey" pTLD to the
253 * respective public key.
255 * @param zkey string "X.zkey" where X is the coordinates of the public
256 * key in an encoding suitable for DNS labels.
257 * @param pkey set to a public key on the eliptic curve
258 * @return #GNUNET_SYSERR if @a zkey has the wrong syntax
261 GNUNET_GNSRECORD_zkey_to_pkey (const char *zkey,
262 struct GNUNET_CRYPTO_EcdsaPublicKey *pkey)
268 cpy = GNUNET_strdup (zkey);
270 if (NULL == (dot = strchr (x, (int) '.')))
273 if (0 != strcasecmp (dot + 1,
278 GNUNET_CRYPTO_ecdsa_public_key_from_string (x,
286 return GNUNET_SYSERR;
290 /* end of gnsrecord_misc.c */