/*
This file is part of GNUnet
- (C) 2010-2013 Christian Grothoff (and other contributing authors)
+ Copyright (C) 2010-2014 GNUnet e.V.
GNUnet is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
*/
/**
* @file dns/dnsparser.c
- * @brief helper library to parse DNS packets.
+ * @brief helper library to parse DNS packets.
* @author Philipp Toelke
* @author Christian Grothoff
*/
{
char *output;
size_t slen;
-
+
if (NULL != strchr (label, '.'))
return GNUNET_SYSERR; /* not a label! Did you mean GNUNET_DNSPARSER_check_name? */
- if (IDNA_SUCCESS !=
+ if (IDNA_SUCCESS !=
idna_to_ascii_8z (label, &output, IDNA_ALLOW_UNASSIGNED))
return GNUNET_SYSERR;
slen = strlen (output);
char *output;
size_t slen;
char *tok;
-
+
ldup = GNUNET_strdup (name);
for (tok = strtok (ldup, "."); NULL != tok; tok = strtok (NULL, "."))
if (GNUNET_OK !=
return GNUNET_SYSERR;
}
GNUNET_free (ldup);
- if (IDNA_SUCCESS !=
+ if (IDNA_SUCCESS !=
idna_to_ascii_8z (name, &output, IDNA_ALLOW_UNASSIGNED))
return GNUNET_SYSERR;
slen = strlen (output);
return;
GNUNET_free_non_null (soa->mname);
GNUNET_free_non_null (soa->rname);
- GNUNET_free (soa);
+ GNUNET_free (soa);
+}
+
+
+/**
+ * Free CERT information record.
+ *
+ * @param cert record to free
+ */
+void
+GNUNET_DNSPARSER_free_cert (struct GNUNET_DNSPARSER_CertRecord *cert)
+{
+ if (NULL == cert)
+ return;
+ GNUNET_free_non_null (cert->certificate_data);
+ GNUNET_free (cert);
}
if (NULL == srv)
return;
GNUNET_free_non_null (srv->target);
- GNUNET_free_non_null (srv->domain_name);
- GNUNET_free_non_null (srv->proto);
- GNUNET_free_non_null (srv->service);
- GNUNET_free (srv);
+ GNUNET_free (srv);
}
if (NULL == mx)
return;
GNUNET_free_non_null (mx->mxhost);
- GNUNET_free (mx);
+ GNUNET_free (mx);
}
/**
* Free the given DNS record.
- *
+ *
* @param r record to free
*/
void
case GNUNET_DNSPARSER_TYPE_SRV:
GNUNET_DNSPARSER_free_srv (r->data.srv);
break;
+ case GNUNET_DNSPARSER_TYPE_CERT:
+ GNUNET_DNSPARSER_free_cert (r->data.cert);
+ break;
case GNUNET_DNSPARSER_TYPE_NS:
case GNUNET_DNSPARSER_TYPE_CNAME:
case GNUNET_DNSPARSER_TYPE_PTR:
size_t xoff;
char *utf8;
Idna_rc rc;
-
+
ret = GNUNET_strdup ("");
while (1)
{
GNUNET_free (xstr);
ret = tmp;
if (strlen (ret) > udp_payload_length)
- {
+ {
GNUNET_break_op (0);
goto error; /* we are looping (building an infinite string) */
}
*off += 2;
/* pointers always terminate names */
break;
- }
+ }
else
{
/* neither pointer nor inline string, not supported... */
if (0 < strlen(ret))
ret[strlen(ret)-1] = '\0'; /* eat tailing '.' */
return ret;
- error:
+ error:
GNUNET_break_op (0);
GNUNET_free (ret);
return NULL;
char *name;
struct GNUNET_TUN_DnsQueryLine ql;
- name = GNUNET_DNSPARSER_parse_name (udp_payload,
+ name = GNUNET_DNSPARSER_parse_name (udp_payload,
udp_payload_length,
off);
if (NULL == name)
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- memcpy (&ql, &udp_payload[*off], sizeof (ql));
+ GNUNET_memcpy (&ql, &udp_payload[*off], sizeof (ql));
*off += sizeof (ql);
q->type = ntohs (ql.type);
- q->class = ntohs (ql.class);
+ q->dns_traffic_class = ntohs (ql.dns_traffic_class);
return GNUNET_OK;
}
*off = old_off;
return NULL;
}
- memcpy (&soa_bin,
- &udp_payload[*off],
+ GNUNET_memcpy (&soa_bin,
+ &udp_payload[*off],
sizeof (struct GNUNET_TUN_DnsSoaRecord));
soa->serial = ntohl (soa_bin.serial);
soa->refresh = ntohl (soa_bin.refresh);
GNUNET_break_op (0);
return NULL;
}
- memcpy (&mxpref, &udp_payload[*off], sizeof (uint16_t));
+ GNUNET_memcpy (&mxpref, &udp_payload[*off], sizeof (uint16_t));
(*off) += sizeof (uint16_t);
mx = GNUNET_new (struct GNUNET_DNSPARSER_MxRecord);
mx->preference = ntohs (mxpref);
/**
* Parse a DNS SRV record.
*
- * @param r_name name of the SRV record
* @param udp_payload reference to UDP packet
* @param udp_payload_length length of @a udp_payload
* @param off pointer to the offset of the query to parse in the SRV record (to be
* @return the parsed SRV record, NULL on error
*/
struct GNUNET_DNSPARSER_SrvRecord *
-GNUNET_DNSPARSER_parse_srv (const char *r_name,
- const char *udp_payload,
+GNUNET_DNSPARSER_parse_srv (const char *udp_payload,
size_t udp_payload_length,
size_t *off)
{
struct GNUNET_DNSPARSER_SrvRecord *srv;
struct GNUNET_TUN_DnsSrvRecord srv_bin;
size_t old_off;
- char *ndup;
- char *tok;
- if ('_' != *r_name)
- return NULL; /* all valid srv names must start with "_" */
- if (NULL == strstr (r_name, "._"))
- return NULL; /* necessary string from "._$PROTO" not present */
old_off = *off;
if (*off + sizeof (struct GNUNET_TUN_DnsSrvRecord) > udp_payload_length)
return NULL;
- memcpy (&srv_bin,
- &udp_payload[*off],
- sizeof (struct GNUNET_TUN_DnsSrvRecord));
+ GNUNET_memcpy (&srv_bin,
+ &udp_payload[*off],
+ sizeof (struct GNUNET_TUN_DnsSrvRecord));
(*off) += sizeof (struct GNUNET_TUN_DnsSrvRecord);
srv = GNUNET_new (struct GNUNET_DNSPARSER_SrvRecord);
srv->priority = ntohs (srv_bin.prio);
srv->weight = ntohs (srv_bin.weight);
srv->port = ntohs (srv_bin.port);
- /* parse 'data.hostname' into components, which are
- "_$SERVICE._$PROTO.$DOMAIN_NAME" */
- ndup = GNUNET_strdup (r_name);
- tok = strtok (ndup, ".");
- GNUNET_assert (NULL != tok);
- GNUNET_assert ('_' == *tok);
- srv->service = GNUNET_strdup (&tok[1]);
- tok = strtok (NULL, ".");
- if ( (NULL == tok) || ('_' != *tok) )
- {
- GNUNET_DNSPARSER_free_srv (srv);
- GNUNET_free (ndup);
- *off = old_off;
- return NULL;
- }
- srv->proto = GNUNET_strdup (&tok[1]);
- tok = strtok (NULL, ".");
- if (NULL == tok)
- {
- GNUNET_DNSPARSER_free_srv (srv);
- GNUNET_free (ndup);
- *off = old_off;
- return NULL;
- }
- srv->domain_name = GNUNET_strdup (tok);
- GNUNET_free (ndup);
srv->target = GNUNET_DNSPARSER_parse_name (udp_payload,
udp_payload_length,
off);
}
+/**
+ * Parse a DNS CERT record.
+ *
+ * @param udp_payload reference to UDP packet
+ * @param udp_payload_length length of @a udp_payload
+ * @param off pointer to the offset of the query to parse in the CERT record (to be
+ * incremented by the size of the record), unchanged on error
+ * @return the parsed CERT record, NULL on error
+ */
+struct GNUNET_DNSPARSER_CertRecord *
+GNUNET_DNSPARSER_parse_cert (const char *udp_payload,
+ size_t udp_payload_length,
+ size_t *off)
+{
+ struct GNUNET_DNSPARSER_CertRecord *cert;
+ struct GNUNET_TUN_DnsCertRecord dcert;
+
+ if (*off + sizeof (struct GNUNET_TUN_DnsCertRecord) >= udp_payload_length)
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ GNUNET_memcpy (&dcert, &udp_payload[*off], sizeof (struct GNUNET_TUN_DnsCertRecord));
+ (*off) += sizeof (struct GNUNET_TUN_DnsCertRecord);
+ cert = GNUNET_new (struct GNUNET_DNSPARSER_CertRecord);
+ cert->cert_type = ntohs (dcert.cert_type);
+ cert->cert_tag = ntohs (dcert.cert_tag);
+ cert->algorithm = dcert.algorithm;
+ cert->certificate_size = udp_payload_length - (*off);
+ cert->certificate_data = GNUNET_malloc (cert->certificate_size);
+ GNUNET_memcpy (cert->certificate_data,
+ &udp_payload[*off],
+ cert->certificate_size);
+ (*off) += cert->certificate_size;
+ return cert;
+}
+
+
/**
* Parse a DNS record entry.
*
size_t old_off;
uint16_t data_len;
- name = GNUNET_DNSPARSER_parse_name (udp_payload,
+ name = GNUNET_DNSPARSER_parse_name (udp_payload,
udp_payload_length,
off);
if (NULL == name)
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- memcpy (&rl, &udp_payload[*off], sizeof (rl));
+ GNUNET_memcpy (&rl, &udp_payload[*off], sizeof (rl));
(*off) += sizeof (rl);
r->type = ntohs (rl.type);
- r->class = ntohs (rl.class);
+ r->dns_traffic_class = ntohs (rl.dns_traffic_class);
r->expiration_time = GNUNET_TIME_relative_to_absolute (GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS,
ntohl (rl.ttl)));
data_len = ntohs (rl.data_len);
case GNUNET_DNSPARSER_TYPE_PTR:
r->data.hostname = GNUNET_DNSPARSER_parse_name (udp_payload,
udp_payload_length,
- off);
+ off);
if ( (NULL == r->data.hostname) ||
(old_off + data_len != *off) )
return GNUNET_SYSERR;
}
return GNUNET_OK;
case GNUNET_DNSPARSER_TYPE_SRV:
- r->data.srv = GNUNET_DNSPARSER_parse_srv (r->name,
- udp_payload,
+ r->data.srv = GNUNET_DNSPARSER_parse_srv (udp_payload,
udp_payload_length,
off);
if ( (NULL == r->data.srv) ||
default:
r->data.raw.data = GNUNET_malloc (data_len);
r->data.raw.data_len = data_len;
- memcpy (r->data.raw.data, &udp_payload[*off], data_len);
+ GNUNET_memcpy (r->data.raw.data, &udp_payload[*off], data_len);
break;
}
(*off) += data_len;
- return GNUNET_OK;
+ return GNUNET_OK;
}
* processing and manipulation.
*
* @param udp_payload wire-format of the DNS packet
- * @param udp_payload_length number of bytes in @a udp_payload
+ * @param udp_payload_length number of bytes in @a udp_payload
* @return NULL on error, otherwise the parsed packet
*/
struct GNUNET_DNSPARSER_Packet *
struct GNUNET_DNSPARSER_Packet *p;
const struct GNUNET_TUN_DnsHeader *dns;
size_t off;
- unsigned int n;
+ unsigned int n;
unsigned int i;
if (udp_payload_length < sizeof (struct GNUNET_TUN_DnsHeader))
udp_payload_length,
&off,
&p->authority_records[i]))
- goto error;
+ goto error;
}
n = ntohs (dns->additional_rcount);
if (n > 0)
udp_payload_length,
&off,
&p->additional_records[i]))
- goto error;
+ goto error;
}
return p;
error:
if (NULL == name)
return GNUNET_SYSERR;
- if (IDNA_SUCCESS !=
+ if (IDNA_SUCCESS !=
(rc = idna_to_ascii_8z (name, &idna_start, IDNA_ALLOW_UNASSIGNED)))
{
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Failed to convert UTF-8 name `%s' to DNS IDNA format: %s\n"),
name,
idna_strerror (rc));
else
len = dot - idna_name;
if ( (len >= 64) || (0 == len) )
- goto fail; /* segment too long or empty */
+ {
+ GNUNET_break (0);
+ goto fail; /* segment too long or empty */
+ }
dst[pos++] = (char) (uint8_t) len;
- memcpy (&dst[pos], idna_name, len);
+ GNUNET_memcpy (&dst[pos], idna_name, len);
pos += len;
idna_name += len + 1; /* also skip dot */
}
#else
free (idna_start);
#endif
- return GNUNET_NO;
+ return GNUNET_NO;
}
if (ret != GNUNET_OK)
return ret;
ql.type = htons (query->type);
- ql.class = htons (query->class);
- memcpy (&dst[*off], &ql, sizeof (ql));
+ ql.dns_traffic_class = htons (query->dns_traffic_class);
+ GNUNET_memcpy (&dst[*off], &ql, sizeof (ql));
(*off) += sizeof (ql);
return GNUNET_OK;
}
if (*off + sizeof (uint16_t) > dst_len)
return GNUNET_NO;
mxpref = htons (mx->preference);
- memcpy (&dst[*off], &mxpref, sizeof (mxpref));
+ GNUNET_memcpy (&dst[*off], &mxpref, sizeof (mxpref));
(*off) += sizeof (mxpref);
return GNUNET_DNSPARSER_builder_add_name (dst, dst_len, off, mx->mxhost);
}
+/**
+ * Add a CERT record to the UDP packet at the given location.
+ *
+ * @param dst where to write the CERT record
+ * @param dst_len number of bytes in @a dst
+ * @param off pointer to offset where to write the CERT information (increment by bytes used);
+ * can also change if there was an error
+ * @param cert CERT information to write
+ * @return #GNUNET_SYSERR if @a cert is invalid
+ * #GNUNET_NO if @a cert did not fit
+ * #GNUNET_OK if @a cert was added to @a dst
+ */
+int
+GNUNET_DNSPARSER_builder_add_cert (char *dst,
+ size_t dst_len,
+ size_t *off,
+ const struct GNUNET_DNSPARSER_CertRecord *cert)
+{
+ struct GNUNET_TUN_DnsCertRecord dcert;
+
+ if ( (cert->cert_type > UINT16_MAX) ||
+ (cert->cert_tag > UINT16_MAX) ||
+ (cert->algorithm > UINT8_MAX) )
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if (*off + sizeof (struct GNUNET_TUN_DnsCertRecord) + cert->certificate_size > dst_len)
+ return GNUNET_NO;
+ dcert.cert_type = htons ((uint16_t) cert->cert_type);
+ dcert.cert_tag = htons ((uint16_t) cert->cert_tag);
+ dcert.algorithm = (uint8_t) cert->algorithm;
+ GNUNET_memcpy (&dst[*off], &dcert, sizeof (dcert));
+ (*off) += sizeof (dcert);
+ GNUNET_memcpy (&dst[*off], cert->certificate_data, cert->certificate_size);
+ (*off) += cert->certificate_size;
+ return GNUNET_OK;
+}
+
+
/**
* Add an SOA record to the UDP packet at the given location.
*
int ret;
if ( (GNUNET_OK != (ret = GNUNET_DNSPARSER_builder_add_name (dst,
- dst_len,
- off,
- soa->mname))) ||
+ dst_len,
+ off,
+ soa->mname))) ||
(GNUNET_OK != (ret = GNUNET_DNSPARSER_builder_add_name (dst,
- dst_len,
- off,
- soa->rname)) ) )
+ dst_len,
+ off,
+ soa->rname)) ) )
return ret;
if (*off + sizeof (struct GNUNET_TUN_DnsSoaRecord) > dst_len)
return GNUNET_NO;
sd.retry = htonl (soa->retry);
sd.expire = htonl (soa->expire);
sd.minimum = htonl (soa->minimum_ttl);
- memcpy (&dst[*off], &sd, sizeof (sd));
+ GNUNET_memcpy (&dst[*off], &sd, sizeof (sd));
(*off) += sizeof (sd);
return GNUNET_OK;
}
sd.prio = htons (srv->priority);
sd.weight = htons (srv->weight);
sd.port = htons (srv->port);
- memcpy (&dst[*off], &sd, sizeof (sd));
+ GNUNET_memcpy (&dst[*off], &sd, sizeof (sd));
(*off) += sizeof (sd);
if (GNUNET_OK != (ret = GNUNET_DNSPARSER_builder_add_name (dst,
dst_len,
size_t start;
size_t pos;
struct GNUNET_TUN_DnsRecordLine rl;
- char *name;
-
+
start = *off;
- /* for SRV records, we can create the name from the details
- of the record if needed */
- name = record->name;
- if ( (GNUNET_DNSPARSER_TYPE_SRV == record->type) &&
- (NULL == name) )
- GNUNET_asprintf (&name,
- "_%s._%s.%s",
- record->data.srv->service,
- record->data.srv->proto,
- record->data.srv->domain_name);
- ret = GNUNET_DNSPARSER_builder_add_name (dst, dst_len - sizeof (struct GNUNET_TUN_DnsRecordLine), off, name);
- if (name != record->name)
- GNUNET_free (name);
+ ret = GNUNET_DNSPARSER_builder_add_name (dst,
+ dst_len - sizeof (struct GNUNET_TUN_DnsRecordLine),
+ off,
+ record->name);
if (GNUNET_OK != ret)
return ret;
/* '*off' is now the position where we will need to write the record line */
pos = *off + sizeof (struct GNUNET_TUN_DnsRecordLine);
switch (record->type)
- {
+ {
case GNUNET_DNSPARSER_TYPE_MX:
- ret = GNUNET_DNSPARSER_builder_add_mx (dst, dst_len, &pos, record->data.mx);
+ ret = GNUNET_DNSPARSER_builder_add_mx (dst, dst_len, &pos, record->data.mx);
+ break;
+ case GNUNET_DNSPARSER_TYPE_CERT:
+ ret = GNUNET_DNSPARSER_builder_add_cert (dst, dst_len, &pos, record->data.cert);
break;
case GNUNET_DNSPARSER_TYPE_SOA:
ret = GNUNET_DNSPARSER_builder_add_soa (dst, dst_len, &pos, record->data.soa);
ret = GNUNET_NO;
break;
}
- memcpy (&dst[pos], record->data.raw.data, record->data.raw.data_len);
+ GNUNET_memcpy (&dst[pos], record->data.raw.data, record->data.raw.data_len);
pos += record->data.raw.data_len;
ret = GNUNET_OK;
break;
return GNUNET_NO;
}
rl.type = htons (record->type);
- rl.class = htons (record->class);
+ rl.dns_traffic_class = htons (record->dns_traffic_class);
rl.ttl = htonl (GNUNET_TIME_absolute_get_remaining (record->expiration_time).rel_value_us / 1000LL / 1000LL); /* in seconds */
rl.data_len = htons ((uint16_t) (pos - (*off + sizeof (struct GNUNET_TUN_DnsRecordLine))));
- memcpy (&dst[*off], &rl, sizeof (struct GNUNET_TUN_DnsRecordLine));
+ GNUNET_memcpy (&dst[*off], &rl, sizeof (struct GNUNET_TUN_DnsRecordLine));
*off = pos;
- return GNUNET_OK;
+ return GNUNET_OK;
}
/**
* Given a DNS packet @a p, generate the corresponding UDP payload.
* Note that we do not attempt to pack the strings with pointers
- * as this would complicate the code and this is about being
+ * as this would complicate the code and this is about being
* simple and secure, not fast, fancy and broken like bind.
*
* @param p packet to pack
uint16_t max,
char **buf,
size_t *buf_length)
-{
+{
struct GNUNET_TUN_DnsHeader dns;
size_t off;
char tmp[max];
unsigned int i;
int ret;
int trc;
-
+
if ( (p->num_queries > UINT16_MAX) ||
(p->num_answers > UINT16_MAX) ||
(p->num_authority_records > UINT16_MAX) ||
trc = GNUNET_NO;
for (i=0;i<p->num_queries;i++)
{
- ret = GNUNET_DNSPARSER_builder_add_query (tmp, sizeof (tmp), &off, &p->queries[i]);
+ ret = GNUNET_DNSPARSER_builder_add_query (tmp,
+ sizeof (tmp),
+ &off,
+ &p->queries[i]);
if (GNUNET_SYSERR == ret)
return GNUNET_SYSERR;
if (GNUNET_NO == ret)
{
dns.query_count = htons ((uint16_t) (i-1));
- trc = GNUNET_YES;
+ trc = GNUNET_YES;
break;
}
}
for (i=0;i<p->num_answers;i++)
{
- ret = add_record (tmp, sizeof (tmp), &off, &p->answers[i]);
+ ret = add_record (tmp,
+ sizeof (tmp),
+ &off,
+ &p->answers[i]);
if (GNUNET_SYSERR == ret)
return GNUNET_SYSERR;
if (GNUNET_NO == ret)
{
dns.answer_rcount = htons ((uint16_t) (i-1));
- trc = GNUNET_YES;
+ trc = GNUNET_YES;
break;
}
}
for (i=0;i<p->num_authority_records;i++)
{
- ret = add_record (tmp, sizeof (tmp), &off, &p->authority_records[i]);
+ ret = add_record (tmp,
+ sizeof (tmp),
+ &off,
+ &p->authority_records[i]);
if (GNUNET_SYSERR == ret)
return GNUNET_SYSERR;
if (GNUNET_NO == ret)
{
dns.authority_rcount = htons ((uint16_t) (i-1));
- trc = GNUNET_YES;
+ trc = GNUNET_YES;
break;
}
}
for (i=0;i<p->num_additional_records;i++)
{
- ret = add_record (tmp, sizeof (tmp), &off, &p->additional_records[i]);
+ ret = add_record (tmp,
+ sizeof (tmp),
+ &off,
+ &p->additional_records[i]);
if (GNUNET_SYSERR == ret)
return GNUNET_SYSERR;
if (GNUNET_NO == ret)
{
dns.additional_rcount = htons (i-1);
- trc = GNUNET_YES;
+ trc = GNUNET_YES;
break;
}
}
if (GNUNET_YES == trc)
- dns.flags.message_truncated = 1;
- memcpy (tmp, &dns, sizeof (struct GNUNET_TUN_DnsHeader));
+ dns.flags.message_truncated = 1;
+ GNUNET_memcpy (tmp,
+ &dns,
+ sizeof (struct GNUNET_TUN_DnsHeader));
*buf = GNUNET_malloc (off);
*buf_length = off;
- memcpy (*buf, tmp, off);
+ GNUNET_memcpy (*buf,
+ tmp,
+ off);
if (GNUNET_YES == trc)
return GNUNET_NO;
return GNUNET_OK;
}
+
+/**
+ * Convert a block of binary data to HEX.
+ *
+ * @param data binary data to convert
+ * @param data_size number of bytes in @a data
+ * @return HEX string (lower case)
+ */
+char *
+GNUNET_DNSPARSER_bin_to_hex (const void *data,
+ size_t data_size)
+{
+ char *ret;
+ size_t off;
+ const uint8_t *idata;
+
+ idata = data;
+ ret = GNUNET_malloc (data_size * 2 + 1);
+ for (off = 0; off < data_size; off++)
+ sprintf (&ret[off * 2],
+ "%02x",
+ idata[off]);
+ return ret;
+}
+
+
+/**
+ * Convert a HEX string to block of binary data.
+ *
+ * @param hex HEX string to convert (may contain mixed case)
+ * @param data where to write result, must be
+ * at least `strlen(hex)/2` bytes long
+ * @return number of bytes written to data
+ */
+size_t
+GNUNET_DNSPARSER_hex_to_bin (const char *hex,
+ void *data)
+{
+ size_t data_size;
+ size_t off;
+ uint8_t *idata;
+ unsigned int h;
+ char in[3];
+
+ data_size = strlen (hex) / 2;
+ idata = data;
+ in[2] = '\0';
+ for (off = 0; off < data_size; off++)
+ {
+ in[0] = tolower ((unsigned char) hex[off * 2]);
+ in[1] = tolower ((unsigned char) hex[off * 2 + 1]);
+ if (1 != sscanf (in, "%x", &h))
+ return off;
+ idata[off] = (uint8_t) h;
+ }
+ return off;
+}
+
+
/* end of dnsparser.c */
projects / oweals / gnunet.git / blobdiff