/*
This file is part of GNUnet
- (C) 2010, 2011, 2012 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
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
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
*/
#include "platform.h"
+#include <idna.h>
+#if WINDOWS
+#include <idn-free.h>
+#endif
#include "gnunet_util_lib.h"
#include "gnunet_dnsparser_lib.h"
+#include "gnunet_tun_lib.h"
-GNUNET_NETWORK_STRUCT_BEGIN
-
-/* FIXME: replace this one with the one from tcpip_tun.h!? */
/**
- * Head of a any DNS message.
+ * Check if a label in UTF-8 format can be coded into valid IDNA.
+ * This can fail if the ASCII-conversion becomes longer than 63 characters.
+ *
+ * @param label label to check (UTF-8 string)
+ * @return #GNUNET_OK if the label can be converted to IDNA,
+ * #GNUNET_SYSERR if the label is not valid for DNS names
*/
-struct GNUNET_TUN_DnsHeader
+int
+GNUNET_DNSPARSER_check_label (const char *label)
{
- /**
- * Request/response ID. (NBO)
- */
- uint16_t id GNUNET_PACKED;
-
- /**
- * Flags for the operation.
- */
- struct GNUNET_DNSPARSER_Flags flags;
-
- /**
- * number of questions (NBO)
- */
- uint16_t query_count GNUNET_PACKED;
-
- /**
- * number of answers (NBO)
- */
- uint16_t answer_rcount GNUNET_PACKED;
-
- /**
- * number of authority-records (NBO)
- */
- uint16_t authority_rcount GNUNET_PACKED;
-
- /**
- * number of additional records (NBO)
- */
- uint16_t additional_rcount GNUNET_PACKED;
-};
+ 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 !=
+ idna_to_ascii_8z (label, &output, IDNA_ALLOW_UNASSIGNED))
+ return GNUNET_SYSERR;
+ slen = strlen (output);
+#if WINDOWS
+ idn_free (output);
+#else
+ free (output);
+#endif
+ return (slen > 63) ? GNUNET_SYSERR : GNUNET_OK;
+}
/**
- * DNS query prefix.
+ * Check if a label in UTF-8 format can be coded into valid IDNA.
+ * This can fail if the ASCII-conversion becomes longer than 253 characters.
+ *
+ * @param name name to check (UTF-8 string)
+ * @return #GNUNET_OK if the label can be converted to IDNA,
+ * #GNUNET_SYSERR if the label is not valid for DNS names
*/
-struct query_line
+int
+GNUNET_DNSPARSER_check_name (const char *name)
{
- /**
- * Desired type (GNUNET_DNSPARSER_TYPE_XXX). (NBO)
- */
- uint16_t type GNUNET_PACKED;
+ char *ldup;
+ char *output;
+ size_t slen;
+ char *tok;
- /**
- * Desired class (usually GNUNET_DNSPARSER_CLASS_INTERNET). (NBO)
- */
- uint16_t class GNUNET_PACKED;
-};
+ ldup = GNUNET_strdup (name);
+ for (tok = strtok (ldup, "."); NULL != tok; tok = strtok (NULL, "."))
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_check_label (tok))
+ {
+ GNUNET_free (ldup);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_free (ldup);
+ if (IDNA_SUCCESS !=
+ idna_to_ascii_8z (name, &output, IDNA_ALLOW_UNASSIGNED))
+ return GNUNET_SYSERR;
+ slen = strlen (output);
+#if WINDOWS
+ idn_free (output);
+#else
+ free (output);
+#endif
+ return (slen > 253) ? GNUNET_SYSERR : GNUNET_OK;
+}
/**
- * General DNS record prefix.
+ * Free SOA information record.
+ *
+ * @param soa record to free
*/
-struct record_line
+void
+GNUNET_DNSPARSER_free_soa (struct GNUNET_DNSPARSER_SoaRecord *soa)
{
- /**
- * Record type (GNUNET_DNSPARSER_TYPE_XXX). (NBO)
- */
- uint16_t type GNUNET_PACKED;
-
- /**
- * Record class (usually GNUNET_DNSPARSER_CLASS_INTERNET). (NBO)
- */
- uint16_t class GNUNET_PACKED;
-
- /**
- * Expiration for the record (in seconds). (NBO)
- */
- uint32_t ttl GNUNET_PACKED;
-
- /**
- * Number of bytes of data that follow. (NBO)
- */
- uint16_t data_len GNUNET_PACKED;
-};
+ if (NULL == soa)
+ return;
+ GNUNET_free_non_null (soa->mname);
+ GNUNET_free_non_null (soa->rname);
+ GNUNET_free (soa);
+}
/**
- * Payload of DNS SOA record (header).
+ * Free CERT information record.
+ *
+ * @param cert record to free
*/
-struct soa_data
+void
+GNUNET_DNSPARSER_free_cert (struct GNUNET_DNSPARSER_CertRecord *cert)
{
- /**
- * The version number of the original copy of the zone. (NBO)
- */
- uint32_t serial GNUNET_PACKED;
-
- /**
- * Time interval before the zone should be refreshed. (NBO)
- */
- uint32_t refresh GNUNET_PACKED;
-
- /**
- * Time interval that should elapse before a failed refresh should
- * be retried. (NBO)
- */
- uint32_t retry GNUNET_PACKED;
-
- /**
- * Time value that specifies the upper limit on the time interval
- * that can elapse before the zone is no longer authoritative. (NBO)
- */
- uint32_t expire GNUNET_PACKED;
-
- /**
- * The bit minimum TTL field that should be exported with any RR
- * from this zone. (NBO)
- */
- uint32_t minimum GNUNET_PACKED;
-};
+ if (NULL == cert)
+ return;
+ GNUNET_free_non_null (cert->certificate_data);
+ GNUNET_free (cert);
+}
/**
- * Payload of DNS SRV record (header).
+ * Free SRV information record.
+ *
+ * @param srv record to free
*/
-struct srv_data
+void
+GNUNET_DNSPARSER_free_srv (struct GNUNET_DNSPARSER_SrvRecord *srv)
{
+ if (NULL == srv)
+ return;
+ GNUNET_free_non_null (srv->target);
+ GNUNET_free (srv);
+}
- /**
- * Preference for this entry (lower value is higher preference). Clients
- * will contact hosts from the lowest-priority group first and fall back
- * to higher priorities if the low-priority entries are unavailable. (NBO)
- */
- uint16_t prio GNUNET_PACKED;
-
- /**
- * Relative weight for records with the same priority. Clients will use
- * the hosts of the same (lowest) priority with a probability proportional
- * to the weight given. (NBO)
- */
- uint16_t weight GNUNET_PACKED;
- /**
- * TCP or UDP port of the service. (NBO)
- */
- uint16_t port GNUNET_PACKED;
+/**
+ * Free MX information record.
+ *
+ * @param mx record to free
+ */
+void
+GNUNET_DNSPARSER_free_mx (struct GNUNET_DNSPARSER_MxRecord *mx)
+{
+ if (NULL == mx)
+ return;
+ GNUNET_free_non_null (mx->mxhost);
+ GNUNET_free (mx);
+}
- /* followed by 'target' name */
-};
-GNUNET_NETWORK_STRUCT_END
+/**
+ * Free the given DNS record.
+ *
+ * @param r record to free
+ */
+void
+GNUNET_DNSPARSER_free_record (struct GNUNET_DNSPARSER_Record *r)
+{
+ GNUNET_free_non_null (r->name);
+ switch (r->type)
+ {
+ case GNUNET_DNSPARSER_TYPE_MX:
+ GNUNET_DNSPARSER_free_mx (r->data.mx);
+ break;
+ case GNUNET_DNSPARSER_TYPE_SOA:
+ GNUNET_DNSPARSER_free_soa (r->data.soa);
+ break;
+ 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:
+ GNUNET_free_non_null (r->data.hostname);
+ break;
+ default:
+ GNUNET_free_non_null (r->data.raw.data);
+ break;
+ }
+}
/**
* Parse name inside of a DNS query or record.
*
* @param udp_payload entire UDP payload
- * @param udp_payload_length length of udp_payload
+ * @param udp_payload_length length of @a udp_payload
* @param off pointer to the offset of the name to parse in the udp_payload (to be
* incremented by the size of the name)
* @param depth current depth of our recursion (to prevent stack overflow)
char *xstr;
uint8_t len;
size_t xoff;
-
+ char *utf8;
+ Idna_rc rc;
+
ret = GNUNET_strdup ("");
while (1)
{
if (*off >= udp_payload_length)
+ {
+ GNUNET_break_op (0);
goto error;
+ }
len = input[*off];
if (0 == len)
{
if (len < 64)
{
if (*off + 1 + len > udp_payload_length)
+ {
+ GNUNET_break_op (0);
goto error;
+ }
GNUNET_asprintf (&tmp,
- "%s%.*s.",
- ret,
+ "%.*s",
(int) len,
&udp_payload[*off + 1]);
+ if (IDNA_SUCCESS !=
+ (rc = idna_to_unicode_8z8z (tmp, &utf8, IDNA_ALLOW_UNASSIGNED)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ _("Failed to convert DNS IDNA name `%s' to UTF-8: %s\n"),
+ tmp,
+ idna_strerror (rc));
+ GNUNET_free (tmp);
+ GNUNET_asprintf (&tmp,
+ "%s%.*s.",
+ ret,
+ (int) len,
+ &udp_payload[*off + 1]);
+ }
+ else
+ {
+ GNUNET_free (tmp);
+ GNUNET_asprintf (&tmp,
+ "%s%s.",
+ ret,
+ utf8);
+#if WINDOWS
+ idn_free (utf8);
+#else
+ free (utf8);
+#endif
+ }
GNUNET_free (ret);
ret = tmp;
*off += 1 + len;
else if ((64 | 128) == (len & (64 | 128)) )
{
if (depth > 32)
+ {
+ GNUNET_break_op (0);
goto error; /* hard bound on stack to prevent "infinite" recursion, disallow! */
+ }
/* pointer to string */
if (*off + 1 > udp_payload_length)
+ {
+ GNUNET_break_op (0);
goto error;
+ }
xoff = ((len - (64 | 128)) << 8) + input[*off+1];
xstr = parse_name (udp_payload,
udp_payload_length,
&xoff,
depth + 1);
if (NULL == xstr)
+ {
+ GNUNET_break_op (0);
goto error;
+ }
GNUNET_asprintf (&tmp,
"%s%s.",
ret,
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... */
+ GNUNET_break_op (0);
goto error;
}
}
if (0 < strlen(ret))
ret[strlen(ret)-1] = '\0'; /* eat tailing '.' */
return ret;
- error:
+ error:
+ GNUNET_break_op (0);
GNUNET_free (ret);
return NULL;
}
+/**
+ * Parse name inside of a DNS query or record.
+ *
+ * @param udp_payload entire UDP payload
+ * @param udp_payload_length length of @a udp_payload
+ * @param off pointer to the offset of the name to parse in the udp_payload (to be
+ * incremented by the size of the name)
+ * @return name as 0-terminated C string on success, NULL if the payload is malformed
+ */
+char *
+GNUNET_DNSPARSER_parse_name (const char *udp_payload,
+ size_t udp_payload_length,
+ size_t *off)
+{
+ return parse_name (udp_payload, udp_payload_length, off, 0);
+}
+
+
/**
* Parse a DNS query entry.
*
* @param udp_payload entire UDP payload
- * @param udp_payload_length length of udp_payload
+ * @param udp_payload_length length of @a udp_payload
* @param off pointer to the offset of the query to parse in the udp_payload (to be
* incremented by the size of the query)
* @param q where to write the query information
- * @return GNUNET_OK on success, GNUNET_SYSERR if the query is malformed
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if the query is malformed
*/
-static int
-parse_query (const char *udp_payload,
- size_t udp_payload_length,
- size_t *off,
- struct GNUNET_DNSPARSER_Query *q)
+int
+GNUNET_DNSPARSER_parse_query (const char *udp_payload,
+ size_t udp_payload_length,
+ size_t *off,
+ struct GNUNET_DNSPARSER_Query *q)
{
char *name;
- struct query_line ql;
+ struct GNUNET_TUN_DnsQueryLine ql;
- name = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
+ name = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
if (NULL == name)
+ {
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
+ }
q->name = name;
- if (*off + sizeof (struct query_line) > udp_payload_length)
+ if (*off + sizeof (struct GNUNET_TUN_DnsQueryLine) > udp_payload_length)
+ {
+ 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;
}
+/**
+ * Parse a DNS SOA 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 SOA record (to be
+ * incremented by the size of the record), unchanged on error
+ * @return the parsed SOA record, NULL on error
+ */
+struct GNUNET_DNSPARSER_SoaRecord *
+GNUNET_DNSPARSER_parse_soa (const char *udp_payload,
+ size_t udp_payload_length,
+ size_t *off)
+{
+ struct GNUNET_DNSPARSER_SoaRecord *soa;
+ struct GNUNET_TUN_DnsSoaRecord soa_bin;
+ size_t old_off;
+
+ old_off = *off;
+ soa = GNUNET_new (struct GNUNET_DNSPARSER_SoaRecord);
+ soa->mname = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
+ soa->rname = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
+ if ( (NULL == soa->mname) ||
+ (NULL == soa->rname) ||
+ (*off + sizeof (struct GNUNET_TUN_DnsSoaRecord) > udp_payload_length) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_DNSPARSER_free_soa (soa);
+ *off = old_off;
+ return NULL;
+ }
+ GNUNET_memcpy (&soa_bin,
+ &udp_payload[*off],
+ sizeof (struct GNUNET_TUN_DnsSoaRecord));
+ soa->serial = ntohl (soa_bin.serial);
+ soa->refresh = ntohl (soa_bin.refresh);
+ soa->retry = ntohl (soa_bin.retry);
+ soa->expire = ntohl (soa_bin.expire);
+ soa->minimum_ttl = ntohl (soa_bin.minimum);
+ (*off) += sizeof (struct GNUNET_TUN_DnsSoaRecord);
+ return soa;
+}
+
+
+/**
+ * Parse a DNS MX 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 MX record (to be
+ * incremented by the size of the record), unchanged on error
+ * @return the parsed MX record, NULL on error
+ */
+struct GNUNET_DNSPARSER_MxRecord *
+GNUNET_DNSPARSER_parse_mx (const char *udp_payload,
+ size_t udp_payload_length,
+ size_t *off)
+{
+ struct GNUNET_DNSPARSER_MxRecord *mx;
+ uint16_t mxpref;
+ size_t old_off;
+
+ old_off = *off;
+ if (*off + sizeof (uint16_t) > udp_payload_length)
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ GNUNET_memcpy (&mxpref, &udp_payload[*off], sizeof (uint16_t));
+ (*off) += sizeof (uint16_t);
+ mx = GNUNET_new (struct GNUNET_DNSPARSER_MxRecord);
+ mx->preference = ntohs (mxpref);
+ mx->mxhost = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
+ if (NULL == mx->mxhost)
+ {
+ GNUNET_break_op (0);
+ GNUNET_DNSPARSER_free_mx (mx);
+ *off = old_off;
+ return NULL;
+ }
+ return mx;
+}
+
+
+/**
+ * Parse a DNS 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
+ * incremented by the size of the record), unchanged on error
+ * @return the parsed SRV record, NULL on error
+ */
+struct GNUNET_DNSPARSER_SrvRecord *
+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;
+
+ old_off = *off;
+ if (*off + sizeof (struct GNUNET_TUN_DnsSrvRecord) > udp_payload_length)
+ return NULL;
+ 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);
+ srv->target = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
+ if (NULL == srv->target)
+ {
+ GNUNET_DNSPARSER_free_srv (srv);
+ *off = old_off;
+ return NULL;
+ }
+ return srv;
+}
+
+
+/**
+ * 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.
*
* @param udp_payload entire UDP payload
- * @param udp_payload_length length of udp_payload
+ * @param udp_payload_length length of @a udp_payload
* @param off pointer to the offset of the record to parse in the udp_payload (to be
* incremented by the size of the record)
* @param r where to write the record information
- * @return GNUNET_OK on success, GNUNET_SYSERR if the record is malformed
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR if the record is malformed
*/
-static int
-parse_record (const char *udp_payload,
- size_t udp_payload_length,
- size_t *off,
- struct GNUNET_DNSPARSER_Record *r)
+int
+GNUNET_DNSPARSER_parse_record (const char *udp_payload,
+ size_t udp_payload_length,
+ size_t *off,
+ struct GNUNET_DNSPARSER_Record *r)
{
char *name;
- struct record_line rl;
+ struct GNUNET_TUN_DnsRecordLine rl;
size_t old_off;
- struct soa_data soa;
- uint16_t mxpref;
uint16_t data_len;
- struct srv_data srv;
- char *ndup;
- char *tok;
- name = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
+ name = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
if (NULL == name)
+ {
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
+ }
r->name = name;
- if (*off + sizeof (struct record_line) > udp_payload_length)
+ if (*off + sizeof (struct GNUNET_TUN_DnsRecordLine) > udp_payload_length)
+ {
+ 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);
if (*off + data_len > udp_payload_length)
+ {
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
+ }
+ old_off = *off;
switch (r->type)
{
case GNUNET_DNSPARSER_TYPE_NS:
case GNUNET_DNSPARSER_TYPE_CNAME:
case GNUNET_DNSPARSER_TYPE_PTR:
- old_off = *off;
- r->data.hostname = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
+ r->data.hostname = GNUNET_DNSPARSER_parse_name (udp_payload,
+ udp_payload_length,
+ off);
if ( (NULL == r->data.hostname) ||
(old_off + data_len != *off) )
return GNUNET_SYSERR;
return GNUNET_OK;
case GNUNET_DNSPARSER_TYPE_SOA:
- old_off = *off;
- r->data.soa = GNUNET_malloc (sizeof (struct GNUNET_DNSPARSER_SoaRecord));
- r->data.soa->mname = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
- r->data.soa->rname = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
- if ( (NULL == r->data.soa->mname) ||
- (NULL == r->data.soa->rname) ||
- (*off + sizeof (struct soa_data) > udp_payload_length) )
- return GNUNET_SYSERR;
- memcpy (&soa, &udp_payload[*off], sizeof (struct soa_data));
- r->data.soa->serial = ntohl (soa.serial);
- r->data.soa->refresh = ntohl (soa.refresh);
- r->data.soa->retry = ntohl (soa.retry);
- r->data.soa->expire = ntohl (soa.expire);
- r->data.soa->minimum_ttl = ntohl (soa.minimum);
- (*off) += sizeof (struct soa_data);
- if (old_off + data_len != *off)
+ r->data.soa = GNUNET_DNSPARSER_parse_soa (udp_payload,
+ udp_payload_length,
+ off);
+ if ( (NULL == r->data.soa) ||
+ (old_off + data_len != *off) )
+ {
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
+ }
return GNUNET_OK;
case GNUNET_DNSPARSER_TYPE_MX:
- old_off = *off;
- if (*off + sizeof (uint16_t) > udp_payload_length)
- return GNUNET_SYSERR;
- memcpy (&mxpref, &udp_payload[*off], sizeof (uint16_t));
- (*off) += sizeof (uint16_t);
- r->data.mx = GNUNET_malloc (sizeof (struct GNUNET_DNSPARSER_MxRecord));
- r->data.mx->preference = ntohs (mxpref);
- r->data.mx->mxhost = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
- if (old_off + data_len != *off)
- return GNUNET_SYSERR;
- return GNUNET_OK;
- case GNUNET_DNSPARSER_TYPE_SRV:
- if ('_' != *r->name)
- return GNUNET_SYSERR; /* all valid srv names must start with "_" */
- if (NULL == strstr (r->name, "._"))
- return GNUNET_SYSERR; /* necessary string from "._$PROTO" not present */
- old_off = *off;
- if (*off + sizeof (struct srv_data) > udp_payload_length)
- return GNUNET_SYSERR;
- memcpy (&srv, &udp_payload[*off], sizeof (struct srv_data));
- (*off) += sizeof (struct srv_data);
- r->data.srv = GNUNET_malloc (sizeof (struct GNUNET_DNSPARSER_SrvRecord));
- r->data.srv->priority = ntohs (srv.prio);
- r->data.srv->weight = ntohs (srv.weight);
- r->data.srv->port = ntohs (srv.port);
- /* parse 'data.hostname' into components, which are
- "_$SERVICE._$PROTO.$DOMAIN_NAME" */
- ndup = GNUNET_strdup (r->name);
- tok = strtok (ndup, ".");
- GNUNET_assert ('_' == *tok);
- r->data.srv->service = GNUNET_strdup (&tok[1]);
- tok = strtok (NULL, ".");
- if ('_' != *tok)
+ r->data.mx = GNUNET_DNSPARSER_parse_mx (udp_payload,
+ udp_payload_length,
+ off);
+ if ( (NULL == r->data.mx) ||
+ (old_off + data_len != *off) )
{
- GNUNET_free (r->data.srv);
- GNUNET_free (ndup);
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- r->data.srv->proto = GNUNET_strdup (&tok[1]);
- tok = strtok (NULL, ".");
- if (NULL == tok)
+ return GNUNET_OK;
+ case GNUNET_DNSPARSER_TYPE_SRV:
+ r->data.srv = GNUNET_DNSPARSER_parse_srv (udp_payload,
+ udp_payload_length,
+ off);
+ if ( (NULL == r->data.srv) ||
+ (old_off + data_len != *off) )
{
- GNUNET_free (r->data.srv);
- GNUNET_free (ndup);
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- r->data.srv->domain_name = GNUNET_strdup (tok);
- GNUNET_free (ndup);
- r->data.srv->target = parse_name (udp_payload,
- udp_payload_length,
- off, 0);
- if (old_off + data_len != *off)
- return GNUNET_SYSERR;
return GNUNET_OK;
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 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))
return NULL;
dns = (const struct GNUNET_TUN_DnsHeader *) udp_payload;
off = sizeof (struct GNUNET_TUN_DnsHeader);
- p = GNUNET_malloc (sizeof (struct GNUNET_DNSPARSER_Packet));
+ p = GNUNET_new (struct GNUNET_DNSPARSER_Packet);
p->flags = dns->flags;
p->id = dns->id;
n = ntohs (dns->query_count);
p->num_queries = n;
for (i=0;i<n;i++)
if (GNUNET_OK !=
- parse_query (udp_payload,
- udp_payload_length,
- &off,
- &p->queries[i]))
+ GNUNET_DNSPARSER_parse_query (udp_payload,
+ udp_payload_length,
+ &off,
+ &p->queries[i]))
goto error;
}
n = ntohs (dns->answer_rcount);
p->num_answers = n;
for (i=0;i<n;i++)
if (GNUNET_OK !=
- parse_record (udp_payload,
- udp_payload_length,
- &off,
- &p->answers[i]))
+ GNUNET_DNSPARSER_parse_record (udp_payload,
+ udp_payload_length,
+ &off,
+ &p->answers[i]))
goto error;
}
n = ntohs (dns->authority_rcount);
p->num_authority_records = n;
for (i=0;i<n;i++)
if (GNUNET_OK !=
- parse_record (udp_payload,
- udp_payload_length,
- &off,
- &p->authority_records[i]))
- goto error;
+ GNUNET_DNSPARSER_parse_record (udp_payload,
+ udp_payload_length,
+ &off,
+ &p->authority_records[i]))
+ goto error;
}
n = ntohs (dns->additional_rcount);
if (n > 0)
p->num_additional_records = n;
for (i=0;i<n;i++)
if (GNUNET_OK !=
- parse_record (udp_payload,
- udp_payload_length,
- &off,
- &p->additional_records[i]))
- goto error;
+ GNUNET_DNSPARSER_parse_record (udp_payload,
+ udp_payload_length,
+ &off,
+ &p->additional_records[i]))
+ goto error;
}
return p;
error:
+ GNUNET_break_op (0);
GNUNET_DNSPARSER_free_packet (p);
return NULL;
}
-/**
- * Free SOA information record.
- *
- * @param soa record to free
- */
-static void
-free_soa (struct GNUNET_DNSPARSER_SoaRecord *soa)
-{
- if (NULL == soa)
- return;
- GNUNET_free_non_null (soa->mname);
- GNUNET_free_non_null (soa->rname);
- GNUNET_free (soa);
-}
-
-
-/**
- * Free SRV information record.
- *
- * @param srv record to free
- */
-static void
-free_srv (struct GNUNET_DNSPARSER_SrvRecord *srv)
-{
- 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);
-}
-
-
-/**
- * Free MX information record.
- *
- * @param mx record to free
- */
-static void
-free_mx (struct GNUNET_DNSPARSER_MxRecord *mx)
-{
- if (NULL == mx)
- return;
- GNUNET_free_non_null (mx->mxhost);
- GNUNET_free (mx);
-}
-
-
-static void
-free_record (struct GNUNET_DNSPARSER_Record *r)
-{
- GNUNET_free_non_null (r->name);
- switch (r->type)
- {
- case GNUNET_DNSPARSER_TYPE_MX:
- free_mx (r->data.mx);
- break;
- case GNUNET_DNSPARSER_TYPE_SOA:
- free_soa (r->data.soa);
- break;
- case GNUNET_DNSPARSER_TYPE_SRV:
- free_srv (r->data.srv);
- break;
- case GNUNET_DNSPARSER_TYPE_NS:
- case GNUNET_DNSPARSER_TYPE_CNAME:
- case GNUNET_DNSPARSER_TYPE_PTR:
- GNUNET_free_non_null (r->data.hostname);
- break;
- default:
- GNUNET_free_non_null (r->data.raw.data);
- break;
- }
-}
-
-
/**
* Free memory taken by a packet.
*
GNUNET_free_non_null (p->queries[i].name);
GNUNET_free_non_null (p->queries);
for (i=0;i<p->num_answers;i++)
- free_record (&p->answers[i]);
+ GNUNET_DNSPARSER_free_record (&p->answers[i]);
GNUNET_free_non_null (p->answers);
for (i=0;i<p->num_authority_records;i++)
- free_record (&p->authority_records[i]);
+ GNUNET_DNSPARSER_free_record (&p->authority_records[i]);
GNUNET_free_non_null (p->authority_records);
for (i=0;i<p->num_additional_records;i++)
- free_record (&p->additional_records[i]);
+ GNUNET_DNSPARSER_free_record (&p->additional_records[i]);
GNUNET_free_non_null (p->additional_records);
GNUNET_free (p);
}
/**
- * Add a DNS name to the UDP packet at the given location.
+ * Add a DNS name to the UDP packet at the given location, converting
+ * the name to IDNA notation as necessary.
*
- * @param dst where to write the name
- * @param dst_len number of bytes in dst
+ * @param dst where to write the name (UDP packet)
+ * @param dst_len number of bytes in @a dst
* @param off pointer to offset where to write the name (increment by bytes used)
* must not be changed if there is an error
* @param name name to write
- * @return GNUNET_SYSERR if 'name' is invalid
- * GNUNET_NO if 'name' did not fit
- * GNUNET_OK if 'name' was added to 'dst'
+ * @return #GNUNET_SYSERR if @a name is invalid
+ * #GNUNET_NO if @a name did not fit
+ * #GNUNET_OK if @a name was added to @a dst
*/
-static int
-add_name (char *dst,
- size_t dst_len,
- size_t *off,
- const char *name)
+int
+GNUNET_DNSPARSER_builder_add_name (char *dst,
+ size_t dst_len,
+ size_t *off,
+ const char *name)
{
const char *dot;
+ const char *idna_name;
+ char *idna_start;
size_t start;
size_t pos;
size_t len;
+ Idna_rc rc;
if (NULL == name)
return GNUNET_SYSERR;
- start = *off;
- if (start + strlen (name) + 2 > dst_len)
+
+ if (IDNA_SUCCESS !=
+ (rc = idna_to_ascii_8z (name, &idna_start, IDNA_ALLOW_UNASSIGNED)))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to convert UTF-8 name `%s' to DNS IDNA format: %s\n"),
+ name,
+ idna_strerror (rc));
return GNUNET_NO;
+ }
+ idna_name = idna_start;
+ start = *off;
+ if (start + strlen (idna_name) + 2 > dst_len)
+ goto fail;
pos = start;
do
{
- dot = strchr (name, '.');
+ dot = strchr (idna_name, '.');
if (NULL == dot)
- len = strlen (name);
+ len = strlen (idna_name);
else
- len = dot - name;
- if ( (len >= 64) || (len == 0) )
- return GNUNET_NO; /* segment too long or empty */
+ len = dot - idna_name;
+ if ( (len >= 64) || (0 == len) )
+ {
+ GNUNET_break (0);
+ goto fail; /* segment too long or empty */
+ }
dst[pos++] = (char) (uint8_t) len;
- memcpy (&dst[pos], name, len);
+ GNUNET_memcpy (&dst[pos], idna_name, len);
pos += len;
- name += len + 1; /* also skip dot */
+ idna_name += len + 1; /* also skip dot */
}
while (NULL != dot);
dst[pos++] = '\0'; /* terminator */
*off = pos;
+#if WINDOWS
+ idn_free (idna_start);
+#else
+ free (idna_start);
+#endif
return GNUNET_OK;
+ fail:
+#if WINDOWS
+ idn_free (idna_start);
+#else
+ free (idna_start);
+#endif
+ return GNUNET_NO;
}
* Add a DNS query to the UDP packet at the given location.
*
* @param dst where to write the query
- * @param dst_len number of bytes in dst
+ * @param dst_len number of bytes in @a dst
* @param off pointer to offset where to write the query (increment by bytes used)
* must not be changed if there is an error
* @param query query to write
- * @return GNUNET_SYSERR if 'query' is invalid
- * GNUNET_NO if 'query' did not fit
- * GNUNET_OK if 'query' was added to 'dst'
+ * @return #GNUNET_SYSERR if @a query is invalid
+ * #GNUNET_NO if @a query did not fit
+ * #GNUNET_OK if @a query was added to @a dst
*/
-static int
-add_query (char *dst,
- size_t dst_len,
- size_t *off,
- const struct GNUNET_DNSPARSER_Query *query)
+int
+GNUNET_DNSPARSER_builder_add_query (char *dst,
+ size_t dst_len,
+ size_t *off,
+ const struct GNUNET_DNSPARSER_Query *query)
{
int ret;
- struct query_line ql;
+ struct GNUNET_TUN_DnsQueryLine ql;
- ret = add_name (dst, dst_len - sizeof (struct query_line), off, query->name);
+ ret = GNUNET_DNSPARSER_builder_add_name (dst, dst_len - sizeof (struct GNUNET_TUN_DnsQueryLine), off, query->name);
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;
}
* Add an MX record to the UDP packet at the given location.
*
* @param dst where to write the mx record
- * @param dst_len number of bytes in dst
+ * @param dst_len number of bytes in @a dst
* @param off pointer to offset where to write the mx information (increment by bytes used);
* can also change if there was an error
* @param mx mx information to write
- * @return GNUNET_SYSERR if 'mx' is invalid
- * GNUNET_NO if 'mx' did not fit
- * GNUNET_OK if 'mx' was added to 'dst'
+ * @return #GNUNET_SYSERR if @a mx is invalid
+ * #GNUNET_NO if @a mx did not fit
+ * #GNUNET_OK if @a mx was added to @a dst
*/
-static int
-add_mx (char *dst,
- size_t dst_len,
- size_t *off,
- const struct GNUNET_DNSPARSER_MxRecord *mx)
+int
+GNUNET_DNSPARSER_builder_add_mx (char *dst,
+ size_t dst_len,
+ size_t *off,
+ const struct GNUNET_DNSPARSER_MxRecord *mx)
{
uint16_t mxpref;
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 add_name (dst, dst_len, off, mx->mxhost);
+ 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.
*
* @param dst where to write the SOA record
- * @param dst_len number of bytes in dst
+ * @param dst_len number of bytes in @a dst
* @param off pointer to offset where to write the SOA information (increment by bytes used)
* can also change if there was an error
* @param soa SOA information to write
- * @return GNUNET_SYSERR if 'soa' is invalid
- * GNUNET_NO if 'soa' did not fit
- * GNUNET_OK if 'soa' was added to 'dst'
+ * @return #GNUNET_SYSERR if @a soa is invalid
+ * #GNUNET_NO if @a soa did not fit
+ * #GNUNET_OK if @a soa was added to @a dst
*/
-static int
-add_soa (char *dst,
- size_t dst_len,
- size_t *off,
- const struct GNUNET_DNSPARSER_SoaRecord *soa)
+int
+GNUNET_DNSPARSER_builder_add_soa (char *dst,
+ size_t dst_len,
+ size_t *off,
+ const struct GNUNET_DNSPARSER_SoaRecord *soa)
{
- struct soa_data sd;
+ struct GNUNET_TUN_DnsSoaRecord sd;
int ret;
- if ( (GNUNET_OK != (ret = add_name (dst,
- dst_len,
- off,
- soa->mname))) ||
- (GNUNET_OK != (ret = add_name (dst,
- dst_len,
- off,
- soa->rname)) ) )
+ if ( (GNUNET_OK != (ret = GNUNET_DNSPARSER_builder_add_name (dst,
+ dst_len,
+ off,
+ soa->mname))) ||
+ (GNUNET_OK != (ret = GNUNET_DNSPARSER_builder_add_name (dst,
+ dst_len,
+ off,
+ soa->rname)) ) )
return ret;
- if (*off + sizeof (struct soa_data) > dst_len)
+ if (*off + sizeof (struct GNUNET_TUN_DnsSoaRecord) > dst_len)
return GNUNET_NO;
sd.serial = htonl (soa->serial);
sd.refresh = htonl (soa->refresh);
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;
}
* Add an SRV record to the UDP packet at the given location.
*
* @param dst where to write the SRV record
- * @param dst_len number of bytes in dst
+ * @param dst_len number of bytes in @a dst
* @param off pointer to offset where to write the SRV information (increment by bytes used)
* can also change if there was an error
* @param srv SRV information to write
- * @return GNUNET_SYSERR if 'srv' is invalid
- * GNUNET_NO if 'srv' did not fit
- * GNUNET_OK if 'srv' was added to 'dst'
+ * @return #GNUNET_SYSERR if @a srv is invalid
+ * #GNUNET_NO if @a srv did not fit
+ * #GNUNET_OK if @a srv was added to @a dst
*/
-static int
-add_srv (char *dst,
- size_t dst_len,
- size_t *off,
- const struct GNUNET_DNSPARSER_SrvRecord *srv)
+int
+GNUNET_DNSPARSER_builder_add_srv (char *dst,
+ size_t dst_len,
+ size_t *off,
+ const struct GNUNET_DNSPARSER_SrvRecord *srv)
{
- struct srv_data sd;
+ struct GNUNET_TUN_DnsSrvRecord sd;
int ret;
- if (*off + sizeof (struct srv_data) > dst_len)
+ if (*off + sizeof (struct GNUNET_TUN_DnsSrvRecord) > dst_len)
return GNUNET_NO;
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 = add_name (dst,
+ if (GNUNET_OK != (ret = GNUNET_DNSPARSER_builder_add_name (dst,
dst_len,
off,
srv->target)))
* Add a DNS record to the UDP packet at the given location.
*
* @param dst where to write the query
- * @param dst_len number of bytes in dst
+ * @param dst_len number of bytes in @a dst
* @param off pointer to offset where to write the query (increment by bytes used)
* must not be changed if there is an error
* @param record record to write
- * @return GNUNET_SYSERR if 'record' is invalid
- * GNUNET_NO if 'record' did not fit
- * GNUNET_OK if 'record' was added to 'dst'
+ * @return #GNUNET_SYSERR if @a record is invalid
+ * #GNUNET_NO if @a record did not fit
+ * #GNUNET_OK if @a record was added to @a dst
*/
static int
add_record (char *dst,
int ret;
size_t start;
size_t pos;
- struct record_line rl;
- char *name;
-
+ struct GNUNET_TUN_DnsRecordLine rl;
+
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 = add_name (dst, dst_len - sizeof (struct record_line), 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 record_line);
+ pos = *off + sizeof (struct GNUNET_TUN_DnsRecordLine);
switch (record->type)
- {
+ {
case GNUNET_DNSPARSER_TYPE_MX:
- ret = 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 = add_soa (dst, dst_len, &pos, record->data.soa);
+ ret = GNUNET_DNSPARSER_builder_add_soa (dst, dst_len, &pos, record->data.soa);
break;
case GNUNET_DNSPARSER_TYPE_NS:
case GNUNET_DNSPARSER_TYPE_CNAME:
case GNUNET_DNSPARSER_TYPE_PTR:
- ret = add_name (dst, dst_len, &pos, record->data.hostname);
+ ret = GNUNET_DNSPARSER_builder_add_name (dst, dst_len, &pos, record->data.hostname);
break;
case GNUNET_DNSPARSER_TYPE_SRV:
- ret = add_srv (dst, dst_len, &pos, record->data.srv);
+ ret = GNUNET_DNSPARSER_builder_add_srv (dst, dst_len, &pos, record->data.srv);
break;
default:
if (pos + record->data.raw.data_len > dst_len)
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;
}
- if (pos - (*off + sizeof (struct record_line)) > UINT16_MAX)
+ if (pos - (*off + sizeof (struct GNUNET_TUN_DnsRecordLine)) > UINT16_MAX)
{
/* record data too long */
*off = start;
return GNUNET_NO;
}
rl.type = htons (record->type);
- rl.class = htons (record->class);
- rl.ttl = htonl (GNUNET_TIME_absolute_get_remaining (record->expiration_time).rel_value / 1000); /* in seconds */
- rl.data_len = htons ((uint16_t) (pos - (*off + sizeof (struct record_line))));
- memcpy (&dst[*off], &rl, sizeof (struct record_line));
+ 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))));
+ GNUNET_memcpy (&dst[*off], &rl, sizeof (struct GNUNET_TUN_DnsRecordLine));
*off = pos;
- return GNUNET_OK;
+ return GNUNET_OK;
}
/**
- * Given a DNS packet, generate the corresponding UDP payload.
+ * 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
* @param max maximum allowed size for the resulting UDP payload
* @param buf set to a buffer with the packed message
- * @param buf_length set to the length of buf
- * @return GNUNET_SYSERR if 'p' is invalid
- * GNUNET_NO if 'p' was truncated (but there is still a result in 'buf')
- * GNUNET_OK if 'p' was packed completely into '*buf'
+ * @param buf_length set to the length of @a buf
+ * @return #GNUNET_SYSERR if @a p is invalid
+ * #GNUNET_NO if @a p was truncated (but there is still a result in @a buf)
+ * #GNUNET_OK if @a p was packed completely into @a buf
*/
int
GNUNET_DNSPARSER_pack (const struct GNUNET_DNSPARSER_Packet *p,
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 = 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