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[GNUnet-SVN] r30214 - gnunet/src/gnsrecord
From: |
gnunet |
Subject: |
[GNUnet-SVN] r30214 - gnunet/src/gnsrecord |
Date: |
Wed, 16 Oct 2013 13:58:42 +0200 |
Author: grothoff
Date: 2013-10-16 13:58:42 +0200 (Wed, 16 Oct 2013)
New Revision: 30214
Added:
gnunet/src/gnsrecord/plugin_gnsrecord_dns.c
Modified:
gnunet/src/gnsrecord/Makefile.am
Log:
-define gnsrecord plugin for DNS
Modified: gnunet/src/gnsrecord/Makefile.am
===================================================================
--- gnunet/src/gnsrecord/Makefile.am 2013-10-16 11:46:16 UTC (rev 30213)
+++ gnunet/src/gnsrecord/Makefile.am 2013-10-16 11:58:42 UTC (rev 30214)
@@ -34,6 +34,21 @@
$(GN_LIB_LDFLAGS) $(WINFLAGS) \
-version-info 0:0:0
+
+plugin_LTLIBRARIES = \
+ libgnunet_plugin_gnsrecord_dns.la
+
+
+libgnunet_plugin_gnsrecord_dns_la_SOURCES = \
+ plugin_gnsrecord_dns.c
+libgnunet_plugin_gnsrecord_dns_la_LIBADD = \
+ $(top_builddir)/src/dns/libgnunetdnsparser.la \
+ $(top_builddir)/src/util/libgnunetutil.la \
+ $(LTLIBINTL)
+libgnunet_plugin_gnsrecord_dns_la_LDFLAGS = \
+ $(GN_PLUGIN_LDFLAGS)
+
+
EXTRA_DIST = \
$(check_SCRIPTS)
Added: gnunet/src/gnsrecord/plugin_gnsrecord_dns.c
===================================================================
--- gnunet/src/gnsrecord/plugin_gnsrecord_dns.c (rev 0)
+++ gnunet/src/gnsrecord/plugin_gnsrecord_dns.c 2013-10-16 11:58:42 UTC (rev
30214)
@@ -0,0 +1,553 @@
+/*
+ This file is part of GNUnet
+ (C) 2013 Christian Grothoff (and other contributing authors)
+
+ 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 3, 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
+ General Public License for more details.
+
+ 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.
+*/
+
+/**
+ * @file gnsrecord/plugin_gnsrecord_dns.c
+ * @brief gnsrecord plugin to provide the API for basic DNS records
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_dnsparser_lib.h"
+#include "gnunet_gnsrecord_plugin.h"
+
+
+/**
+ * Convert the 'value' of a record to a string.
+ *
+ * @param cls closure, unused
+ * @param type type of the record
+ * @param data value in binary encoding
+ * @param data_size number of bytes in @a data
+ * @return NULL on error, otherwise human-readable representation of the value
+ */
+static char *
+dns_value_to_string (void *cls,
+ uint32_t type,
+ const void *data,
+ size_t data_size)
+{
+ const char *cdata;
+ char* result;
+ char tmp[INET6_ADDRSTRLEN];
+
+ switch (type)
+ {
+ case GNUNET_DNSPARSER_TYPE_A:
+ if (data_size != sizeof (struct in_addr))
+ return NULL;
+ if (NULL == inet_ntop (AF_INET, data, tmp, sizeof (tmp)))
+ return NULL;
+ return GNUNET_strdup (tmp);
+ case GNUNET_DNSPARSER_TYPE_NS:
+ {
+ char *ns;
+ size_t off;
+
+ off = 0;
+ ns = GNUNET_DNSPARSER_parse_name (data,
+ data_size,
+ &off);
+ if ( (NULL == ns) ||
+ (off != data_size) )
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ return ns;
+ }
+ case GNUNET_DNSPARSER_TYPE_CNAME:
+ {
+ char *cname;
+ size_t off;
+
+ off = 0;
+ cname = GNUNET_DNSPARSER_parse_name (data,
+ data_size,
+ &off);
+ if ( (NULL == cname) ||
+ (off != data_size) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_free_non_null (cname);
+ return NULL;
+ }
+ return cname;
+ }
+ case GNUNET_DNSPARSER_TYPE_SOA:
+ {
+ struct GNUNET_DNSPARSER_SoaRecord *soa;
+ size_t off;
+
+ off = 0;
+ soa = GNUNET_DNSPARSER_parse_soa (data,
+ data_size,
+ &off);
+ if ( (NULL == soa) ||
+ (off != data_size) )
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ GNUNET_asprintf (&result,
+ "rname=%s mname=%s %lu,%lu,%lu,%lu,%lu",
+ soa->rname,
+ soa->mname,
+ soa->serial,
+ soa->refresh,
+ soa->retry,
+ soa->expire,
+ soa->minimum_ttl);
+ GNUNET_DNSPARSER_free_soa (soa);
+ return result;
+ }
+ case GNUNET_DNSPARSER_TYPE_PTR:
+ {
+ char *ptr;
+ size_t off;
+
+ off = 0;
+ ptr = GNUNET_DNSPARSER_parse_name (data,
+ data_size,
+ &off);
+ if ( (NULL == ptr) ||
+ (off != data_size) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_free_non_null (ptr);
+ return NULL;
+ }
+ return ptr;
+ }
+ case GNUNET_DNSPARSER_TYPE_MX:
+ {
+ struct GNUNET_DNSPARSER_MxRecord *mx;
+ size_t off;
+
+ off = 0;
+ mx = GNUNET_DNSPARSER_parse_mx (data,
+ data_size,
+ &off);
+ if ( (NULL == mx) ||
+ (off != data_size) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_free_non_null (mx);
+ return NULL;
+ }
+ GNUNET_asprintf (&result,
+ "%hu,%s",
+ mx->preference,
+ mx->mxhost);
+ GNUNET_DNSPARSER_free_mx (mx);
+ return result;
+ }
+ case GNUNET_DNSPARSER_TYPE_TXT:
+ return GNUNET_strndup (data, data_size);
+ case GNUNET_DNSPARSER_TYPE_AAAA:
+ if (data_size != sizeof (struct in6_addr))
+ return NULL;
+ if (NULL == inet_ntop (AF_INET6, data, tmp, sizeof (tmp)))
+ return NULL;
+ return GNUNET_strdup (tmp);
+ case GNUNET_DNSPARSER_TYPE_SRV:
+ {
+ struct GNUNET_DNSPARSER_SrvRecord *srv;
+ size_t off;
+
+ off = 0;
+ srv = GNUNET_DNSPARSER_parse_srv ("+", /* FIXME: is this OK? */
+ data,
+ data_size,
+ &off);
+ if ( (NULL == srv) ||
+ (off != data_size) )
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ GNUNET_asprintf (&result,
+ "%d %d %d _%s._%s.%s",
+ srv->priority,
+ srv->weight,
+ srv->port,
+ srv->service,
+ srv->proto,
+ srv->domain_name);
+ GNUNET_DNSPARSER_free_srv (srv);
+ return result;
+ }
+ case GNUNET_DNSPARSER_TYPE_TLSA:
+ {
+ const struct GNUNET_TUN_DnsTlsaRecord *tlsa;
+ char* tlsa_str;
+
+ cdata = data;
+ if ( (data_size <= sizeof (struct GNUNET_TUN_DnsTlsaRecord)) ||
+ ('\0' != cdata[data_size - 1]) )
+ return NULL; /* malformed */
+ tlsa = data;
+ if (0 == GNUNET_asprintf (&tlsa_str,
+ "%c %c %c %s",
+ tlsa->usage,
+ tlsa->selector,
+ tlsa->matching_type,
+ (const char *) &tlsa[1]))
+ {
+ GNUNET_free (tlsa_str);
+ return NULL;
+ }
+ return tlsa_str;
+ }
+ default:
+ return NULL;
+ }
+}
+
+
+/**
+ * Convert human-readable version of a 'value' of a record to the binary
+ * representation.
+ *
+ * @param cls closure, unused
+ * @param type type of the record
+ * @param s human-readable string
+ * @param data set to value in binary encoding (will be allocated)
+ * @param data_size set to number of bytes in @a data
+ * @return #GNUNET_OK on success
+ */
+static int
+dns_string_to_value (void *cls,
+ uint32_t type,
+ const char *s,
+ void **data,
+ size_t *data_size)
+{
+ struct in_addr value_a;
+ struct in6_addr value_aaaa;
+ struct GNUNET_TUN_DnsTlsaRecord *tlsa;
+
+ if (NULL == s)
+ return GNUNET_SYSERR;
+ switch (type)
+ {
+ case GNUNET_DNSPARSER_TYPE_A:
+ if (1 != inet_pton (AF_INET, s, &value_a))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Unable to parse IPv4 address `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ *data = GNUNET_malloc (sizeof (struct in_addr));
+ memcpy (*data, &value_a, sizeof (value_a));
+ *data_size = sizeof (value_a);
+ return GNUNET_OK;
+ case GNUNET_DNSPARSER_TYPE_NS:
+ {
+ char nsbuf[256];
+ size_t off;
+
+ off = 0;
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_builder_add_name (nsbuf,
+ sizeof (nsbuf),
+ &off,
+ s))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to serialize NS record with value `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ *data_size = off;
+ *data = GNUNET_malloc (off);
+ memcpy (*data, nsbuf, off);
+ return GNUNET_OK;
+ }
+ case GNUNET_DNSPARSER_TYPE_CNAME:
+ {
+ char cnamebuf[256];
+ size_t off;
+
+ off = 0;
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_builder_add_name (cnamebuf,
+ sizeof (cnamebuf),
+ &off,
+ s))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to serialize CNAME record with value `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ *data_size = off;
+ *data = GNUNET_malloc (off);
+ memcpy (*data, cnamebuf, off);
+ return GNUNET_OK;
+ }
+ case GNUNET_DNSPARSER_TYPE_SOA:
+ {
+ struct GNUNET_DNSPARSER_SoaRecord soa;
+ char soabuf[540];
+ char soa_rname[253 + 1];
+ char soa_mname[253 + 1];
+ unsigned int soa_serial;
+ unsigned int soa_refresh;
+ unsigned int soa_retry;
+ unsigned int soa_expire;
+ unsigned int soa_min;
+ size_t off;
+
+ if (7 != SSCANF (s,
+ "rname=%253s mname=%253s %u,%u,%u,%u,%u",
+ soa_rname, soa_mname,
+ &soa_serial, &soa_refresh, &soa_retry, &soa_expire,
&soa_min))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Unable to parse SOA record `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ soa.mname = soa_mname;
+ soa.rname = soa_rname;
+ soa.serial = (uint32_t) soa_serial;
+ soa.refresh =(uint32_t) soa_refresh;
+ soa.retry = (uint32_t) soa_retry;
+ soa.expire = (uint32_t) soa_expire;
+ soa.minimum_ttl = (uint32_t) soa_min;
+ off = 0;
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_builder_add_soa (soabuf,
+ sizeof (soabuf),
+ &off,
+ &soa))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to serialize SOA record with mname `%s' and rname
`%s'\n"),
+ soa_mname,
+ soa_rname);
+ return GNUNET_SYSERR;
+ }
+ *data_size = off;
+ *data = GNUNET_malloc (off);
+ memcpy (*data, soabuf, off);
+ return GNUNET_OK;
+ }
+ case GNUNET_DNSPARSER_TYPE_PTR:
+ {
+ char ptrbuf[256];
+ size_t off;
+
+ off = 0;
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_builder_add_name (ptrbuf,
+ sizeof (ptrbuf),
+ &off,
+ s))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to serialize PTR record with value `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ *data_size = off;
+ *data = GNUNET_malloc (off);
+ memcpy (*data, ptrbuf, off);
+ return GNUNET_OK;
+ }
+ case GNUNET_DNSPARSER_TYPE_MX:
+ {
+ struct GNUNET_DNSPARSER_MxRecord mx;
+ char mxbuf[258];
+ char mxhost[253 + 1];
+ uint16_t mx_pref;
+ size_t off;
+
+ if (2 != SSCANF(s, "%hu,%253s", &mx_pref, mxhost))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Unable to parse MX record `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ mx.preference = mx_pref;
+ mx.mxhost = mxhost;
+ off = 0;
+
+ if (GNUNET_OK !=
+ GNUNET_DNSPARSER_builder_add_mx (mxbuf,
+ sizeof (mxbuf),
+ &off,
+ &mx))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to serialize MX record with hostname `%s'\n"),
+ mxhost);
+ return GNUNET_SYSERR;
+ }
+ *data_size = off;
+ *data = GNUNET_malloc (off);
+ memcpy (*data, mxbuf, off);
+ return GNUNET_OK;
+ }
+ case GNUNET_DNSPARSER_TYPE_SRV:
+ GNUNET_break (0); // FIXME: not implemented!
+ return GNUNET_SYSERR;
+ case GNUNET_DNSPARSER_TYPE_TXT:
+ *data = GNUNET_strdup (s);
+ *data_size = strlen (s);
+ return GNUNET_OK;
+ case GNUNET_DNSPARSER_TYPE_AAAA:
+ if (1 != inet_pton (AF_INET6, s, &value_aaaa))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Unable to parse IPv6 address `%s'\n"),
+ s);
+ return GNUNET_SYSERR;
+ }
+ *data = GNUNET_malloc (sizeof (struct in6_addr));
+ *data_size = sizeof (struct in6_addr);
+ memcpy (*data, &value_aaaa, sizeof (value_aaaa));
+ return GNUNET_OK;
+ case GNUNET_DNSPARSER_TYPE_TLSA:
+ *data_size = sizeof (struct GNUNET_TUN_DnsTlsaRecord) + strlen (s) - 6;
+ *data = tlsa = GNUNET_malloc (*data_size);
+ if (4 != SSCANF (s, "%c %c %c %s",
+ &tlsa->usage,
+ &tlsa->selector,
+ &tlsa->matching_type,
+ (char*)&tlsa[1]))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Unable to parse TLSA record string `%s'\n"),
+ s);
+ *data_size = 0;
+ GNUNET_free (tlsa);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+ default:
+ return GNUNET_SYSERR;
+ }
+}
+
+
+/**
+ * Mapping of record type numbers to human-readable
+ * record type names.
+ */
+static struct {
+ const char *name;
+ uint32_t number;
+} name_map[] = {
+ { "A", GNUNET_DNSPARSER_TYPE_A },
+ { "NS", GNUNET_DNSPARSER_TYPE_NS },
+ { "CNAME", GNUNET_DNSPARSER_TYPE_CNAME },
+ { "SOA", GNUNET_DNSPARSER_TYPE_SOA },
+ { "PTR", GNUNET_DNSPARSER_TYPE_PTR },
+ { "MX", GNUNET_DNSPARSER_TYPE_MX },
+ { "TXT", GNUNET_DNSPARSER_TYPE_TXT },
+ { "AAAA", GNUNET_DNSPARSER_TYPE_AAAA },
+ { "TLSA", GNUNET_DNSPARSER_TYPE_TLSA },
+ { NULL, UINT32_MAX }
+};
+
+
+/**
+ * Convert a type name (i.e. "AAAA") to the corresponding number.
+ *
+ * @param cls closure, unused
+ * @param dns_typename name to convert
+ * @return corresponding number, UINT32_MAX on error
+ */
+static uint32_t
+dns_typename_to_number (void *cls,
+ const char *dns_typename)
+{
+ unsigned int i;
+
+ i=0;
+ while ( (name_map[i].name != NULL) &&
+ (0 != strcasecmp (dns_typename, name_map[i].name)) )
+ i++;
+ return name_map[i].number;
+}
+
+
+/**
+ * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
+ *
+ * @param cls closure, unused
+ * @param type number of a type to convert
+ * @return corresponding typestring, NULL on error
+ */
+static const char *
+dns_number_to_typename (void *cls,
+ uint32_t type)
+{
+ unsigned int i;
+
+ i=0;
+ while ( (name_map[i].name != NULL) &&
+ (type != name_map[i].number) )
+ i++;
+ return name_map[i].name;
+}
+
+
+/**
+ * Entry point for the plugin.
+ *
+ * @param cls NULL
+ * @return the exported block API
+ */
+void *
+libgnunet_plugin_gnsrecord_dns_init (void *cls)
+{
+ struct GNUNET_GNSRECORD_PluginFunctions *api;
+
+ api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
+ api->value_to_string = &dns_value_to_string;
+ api->string_to_value = &dns_string_to_value;
+ api->typename_to_number = &dns_typename_to_number;
+ api->number_to_typename = &dns_number_to_typename;
+ return api;
+}
+
+
+/**
+ * Exit point from the plugin.
+ *
+ * @param cls the return value from #libgnunet_plugin_block_test_init
+ * @return NULL
+ */
+void *
+libgnunet_plugin_gnsrecord_dns_done (void *cls)
+{
+ struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
+
+ GNUNET_free (api);
+ return NULL;
+}
+
+/* end of plugin_gnsrecord_dns.c */
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