#include "platform.h"
#include "gnunet_common.h"
+/**
+ * Maximum length of a label in DNS.
+ */
+#define GNUNET_DNSPARSER_MAX_LABEL_LENGTH 63
+
+/**
+ * Maximum length of a name in DNS.
+ */
+#define GNUNET_DNSPARSER_MAX_NAME_LENGTH 253
+
+
/**
* A few common DNS types.
*/
#define GNUNET_DNSPARSER_TYPE_TXT 16
#define GNUNET_DNSPARSER_TYPE_AAAA 28
#define GNUNET_DNSPARSER_TYPE_SRV 33
+#define GNUNET_DNSPARSER_TYPE_TLSA 52
/**
* A few common DNS classes (ok, only one is common, but I list a
*/
struct GNUNET_DNSPARSER_Flags
{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
/**
* Set to 1 if recursion is desired (client -> server)
*/
* Set to 1 if recursion is available (server -> client)
*/
unsigned int recursion_available : 1 GNUNET_PACKED;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+
+ /**
+ * query:0, response:1
+ */
+ unsigned int query_or_response : 1 GNUNET_PACKED;
+
+ /**
+ * See GNUNET_DNSPARSER_OPCODE_ defines.
+ */
+ unsigned int opcode : 4 GNUNET_PACKED;
+
+ /**
+ * Set to 1 if this is an authoritative answer
+ */
+ unsigned int authoritative_answer : 1 GNUNET_PACKED;
+
+ /**
+ * Set to 1 if message is truncated
+ */
+ unsigned int message_truncated : 1 GNUNET_PACKED;
+
+ /**
+ * Set to 1 if recursion is desired (client -> server)
+ */
+ unsigned int recursion_desired : 1 GNUNET_PACKED;
+
+
+ /**
+ * Set to 1 if recursion is available (server -> client)
+ */
+ unsigned int recursion_available : 1 GNUNET_PACKED;
+
+ /**
+ * Always zero.
+ */
+ unsigned int zero : 1 GNUNET_PACKED;
+
+ /**
+ * Response has been cryptographically verified, RFC 4035.
+ */
+ unsigned int authenticated_data : 1 GNUNET_PACKED;
+
+ /**
+ * See RFC 4035.
+ */
+ unsigned int checking_disabled : 1 GNUNET_PACKED;
+
+ /**
+ * See GNUNET_DNSPARSER_RETURN_CODE_ defines.
+ */
+ unsigned int return_code : 4 GNUNET_PACKED;
+#else
+ #error byteorder undefined
+#endif
} GNUNET_GCC_STRUCT_LAYOUT;
/**
* Name of the record that the query is for (0-terminated).
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *name;
/**
* Name of the mail server.
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *mxhost;
/**
* Service name without the underscore (!). Note that RFC 6335 clarifies the
* set of legal characters for service names.
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *service;
/**
* Domain name for which the record is valid
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *domain_name;
/**
* Hostname offering the service.
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *target;
/**
*The domainname of the name server that was the
* original or primary source of data for this zone.
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *mname;
/**
* A domainname which specifies the mailbox of the
* person responsible for this zone.
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *rname;
/**
* Name of the record that the query is for (0-terminated).
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *name;
/**
* For NS, CNAME and PTR records, this is the uncompressed 0-terminated hostname.
+ * In UTF-8 format. The library will convert from and to DNS-IDNA
+ * as necessary. Use 'GNUNET_DNSPARSER_check_label' to test if an
+ * individual label is well-formed. If a given name is not well-formed,
+ * creating the DNS packet will fail.
*/
char *hostname;
};
+/**
+ * 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
+ */
+int
+GNUNET_DNSPARSER_check_label (const char *label);
+
+
/**
* Parse a UDP payload of a DNS packet in to a nice struct for further
* processing and manipulation.
projects / oweals / gnunet.git / blobdiff