#include "gnunet_os_lib.h"
#include "gnunet-service-dns-p.h"
#include "gnunet_protocols.h"
+#include "gnunet_applications.h"
#include "gnunet-vpn-packet.h"
#include "gnunet_container_lib.h"
#include "gnunet-dns-parser.h"
#include "gnunet_block_lib.h"
#include "block_dns.h"
#include "gnunet_crypto_lib.h"
+#include "gnunet_mesh_service.h"
#include "gnunet_signatures.h"
+struct GNUNET_MESH_Handle *mesh_handle;
+
/**
* The UDP-Socket through which DNS-Resolves will be sent if they are not to be
* sent through gnunet. The port of this socket will not be hijacked.
return len;
}
+struct tunnel_cls {
+ struct GNUNET_MESH_Tunnel *tunnel;
+ struct GNUNET_MessageHeader hdr;
+ struct dns_pkt dns;
+};
+
+struct tunnel_cls *remote_pending[UINT16_MAX];
+
+
+static size_t
+mesh_send (void *cls, size_t size, void *buf)
+{
+ struct tunnel_cls *cls_ = (struct tunnel_cls *) cls;
+
+ GNUNET_assert(cls_->hdr.size <= size);
+
+ size = cls_->hdr.size;
+ cls_->hdr.size = htons(cls_->hdr.size);
+
+ memcpy(buf, &cls_->hdr, size);
+ return size;
+}
+
+
+void mesh_connect (void* cls, const struct GNUNET_PeerIdentity* peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi) {
+ GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Connected to peer %x\n", *((unsigned long*)peer));
+ struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
+
+ GNUNET_MESH_notify_transmit_ready(cls_->tunnel,
+ GNUNET_YES,
+ 42,
+ GNUNET_TIME_UNIT_MINUTES,
+ NULL,
+ cls_->hdr.size,
+ mesh_send,
+ cls);
+}
+
+
+static void
+send_mesh_query (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
+ struct tunnel_cls *cls_ = (struct tunnel_cls*)cls;
+
+ cls_->tunnel = GNUNET_MESH_peer_request_connect_by_type(mesh_handle,
+ GNUNET_TIME_UNIT_HOURS,
+ GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
+ mesh_connect,
+ NULL,
+ cls_);
+
+ remote_pending[cls_->dns.s.id] = cls_;
+}
+
+static int
+receive_mesh_query (void *cls,
+ struct GNUNET_MESH_Tunnel *tunnel,
+ void **ctx,
+ const struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+{
+ return GNUNET_SYSERR;
+}
+
+static int
+receive_mesh_answer (void *cls,
+ struct GNUNET_MESH_Tunnel *tunnel,
+ void **ctx,
+ const struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_MessageHeader *message,
+ const struct GNUNET_TRANSPORT_ATS_Information *atsi)
+{
+ /* TODo: size check */
+ struct dns_pkt *dns = (struct dns_pkt *) (message + 1);
+
+ /* They sent us a packet we were not waiting for */
+ if (remote_pending[dns->s.id] == NULL
+ || remote_pending[dns->s.id]->tunnel != tunnel)
+ return GNUNET_SYSERR;
+ if (query_states[dns->s.id].valid != GNUNET_YES)
+ return GNUNET_SYSERR;
+ query_states[dns->s.id].valid = GNUNET_NO;
+
+ size_t len = sizeof (struct answer_packet) - 1 + sizeof (struct dns_static) + query_states[dns->s.id].namelen + sizeof (struct dns_query_line) + 2 /* To hold the pointer (as defined in RFC1035) to the name */
+ + sizeof (struct dns_record_line) - 1 + 16; /* To hold the IPv6-Address */
+
+ struct answer_packet_list *answer =
+ GNUNET_malloc (len + 2 * sizeof (struct answer_packet_list *));
+ memset (answer, 0, len + 2 * sizeof (struct answer_packet_list *));
+
+ answer->pkt.hdr.type = htons (GNUNET_MESSAGE_TYPE_LOCAL_RESPONSE_DNS);
+ answer->pkt.hdr.size = htons (len);
+ answer->pkt.subtype = GNUNET_DNS_ANSWER_TYPE_REMOTE;
+
+ struct dns_pkt_parsed* pdns = parse_dns_packet(dns);
+
+ if (ntohs(pdns->s.ancount) < 1)
+ {
+ free_parsed_dns_packet(pdns);
+ return GNUNET_OK;
+ }
+
+ answer->pkt.addrsize = pdns->answers[0]->data_len;
+ memcpy(answer->pkt.addr, pdns->answers[0]->data, ntohs(pdns->answers[0]->data_len));
+
+ answer->pkt.from = query_states[dns->s.id].remote_ip;
+
+ answer->pkt.to = query_states[dns->s.id].local_ip;
+ answer->pkt.dst_port = query_states[dns->s.id].local_port;
+
+ struct dns_pkt *dpkt = (struct dns_pkt *) answer->pkt.data;
+
+ dpkt->s.id = dns->s.id;
+ dpkt->s.aa = 1;
+ dpkt->s.qr = 1;
+ dpkt->s.ra = 1;
+ dpkt->s.qdcount = htons (1);
+ dpkt->s.ancount = htons (1);
+
+ memcpy (dpkt->data, query_states[dns->s.id].name,
+ query_states[dns->s.id].namelen);
+ GNUNET_free (query_states[dns->s.id].name);
+
+ struct dns_query_line *dque =
+ (struct dns_query_line *) (dpkt->data +
+ (query_states[dns->s.id].namelen));
+ dque->type = htons (28); /* AAAA */
+ dque->class = htons (1); /* IN */
+
+ char *anname =
+ (char *) (dpkt->data + (query_states[dns->s.id].namelen) +
+ sizeof (struct dns_query_line));
+ memcpy (anname, "\xc0\x0c", 2);
+
+ struct dns_record_line *drec_data =
+ (struct dns_record_line *) (dpkt->data +
+ (query_states[dns->s.id].namelen) +
+ sizeof (struct dns_query_line) + 2);
+ drec_data->type = htons (28); /* AAAA */
+ drec_data->class = htons (1); /* IN */
+
+ drec_data->ttl = pdns->answers[0]->ttl;
+ drec_data->data_len = htons (16);
+
+ /* Calculate at which offset in the packet the IPv6-Address belongs, it is
+ * filled in by the daemon-vpn */
+ answer->pkt.addroffset =
+ htons ((unsigned short) ((unsigned long) (&drec_data->data) -
+ (unsigned long) (&answer->pkt)));
+
+ GNUNET_CONTAINER_DLL_insert_after (head, tail, tail, answer);
+
+ GNUNET_SERVER_notify_transmit_ready (query_states[dns->s.id].client,
+ len,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ &send_answer,
+ query_states[dns->s.id].client);
+
+ free_parsed_dns_packet(pdns);
+ return GNUNET_OK;
+}
+
+
static void
send_rev_query(void * cls, const struct GNUNET_SCHEDULER_TaskContext *tc) {
+ if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
+ return;
+
struct dns_pkt_parsed* pdns = (struct dns_pkt_parsed*) cls;
unsigned short id = pdns->s.id;
}
GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Query for '%s'; namelen=%d\n", pdns->queries[0]->name, pdns->queries[0]->namelen);
- /* The query is for a PTR of a previosly resolved virtual IP */
+
+ /* This is a PTR-Query. Check if it is for "our" network */
if (htons(pdns->queries[0]->qtype) == 12 &&
74 == pdns->queries[0]->namelen)
{
}
}
+ char* virt_dns;
+ int virt_dns_bytes;
+ if (GNUNET_SYSERR ==
+ GNUNET_CONFIGURATION_get_value_string (cfg, "vpn", "VIRTDNS",
+ &virt_dns))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "No entry 'VIRTDNS' in configuration!\n");
+ exit (1);
+ }
+
+ if (1 != inet_pton (AF_INET, virt_dns, &virt_dns_bytes))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ "Error parsing 'VIRTDNS': %s; %m!\n", virt_dns);
+ exit(1);
+ }
+
+ GNUNET_free(virt_dns);
+
+ if (virt_dns_bytes == pkt->orig_to)
+ {
+ /* This is a packet that was sent directly to the virtual dns-server
+ *
+ * This means we have to send this query over gnunet
+ */
+
+ size_t size = sizeof(struct GNUNET_MESH_Tunnel*) + sizeof(struct GNUNET_MessageHeader) + (ntohs(message->size) - sizeof(struct query_packet) + 1);
+ struct tunnel_cls *cls_ = GNUNET_malloc(size);
+ cls_->hdr.size = size - sizeof(struct GNUNET_MESH_Tunnel*);
+
+ cls_->hdr.type = ntohs(GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS);
+
+ memcpy(&cls_->dns, dns, cls_->hdr.size);
+ GNUNET_SCHEDULER_add_now(send_mesh_query, cls_);
+
+ goto out;
+ }
+
+
/* The query should be sent to the network */
struct sockaddr_in dest;
const struct GNUNET_CONFIGURATION_Handle *cfg_)
{
static const struct GNUNET_SERVER_MessageHandler handlers[] = {
- /* callback, cls, type, size */
- {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
- {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK, sizeof(struct GNUNET_MessageHeader)},
- {NULL, NULL, 0, 0}
+ /* callback, cls, type, size */
+ {&receive_query, NULL, GNUNET_MESSAGE_TYPE_LOCAL_QUERY_DNS, 0},
+ {&rehijack, NULL, GNUNET_MESSAGE_TYPE_REHIJACK,
+ sizeof (struct GNUNET_MessageHeader)},
+ {NULL, NULL, 0, 0}
};
+ static struct GNUNET_MESH_MessageHandler *mesh_handlers;
+
+ if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno(cfg_, "dns", "PROVIDE_EXIT"))
+ mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
+ {receive_mesh_query, GNUNET_MESSAGE_TYPE_REMOTE_QUERY_DNS, 0},
+ {NULL, 0, 0}
+ };
+ else
+ mesh_handlers = (struct GNUNET_MESH_MessageHandler[]) {
+ {receive_mesh_answer, GNUNET_MESSAGE_TYPE_REMOTE_ANSWER_DNS, 0},
+ {NULL, 0, 0}
+ };
+
+ const static GNUNET_MESH_ApplicationType apptypes[] =
+ { GNUNET_APPLICATION_TYPE_INTERNET_RESOLVER,
+ GNUNET_APPLICATION_TYPE_END
+ };
+
+ mesh_handle = GNUNET_MESH_connect (cfg_, NULL, NULL, mesh_handlers, apptypes);
+
cfg = cfg_;
unsigned int i;
- for (i = 0; i < 65536; i++) {
+ for (i = 0; i < 65536; i++)
+ {
query_states[i].valid = GNUNET_NO;
- }
+ }
- dht = GNUNET_DHT_connect(cfg, 1024);
+ dht = GNUNET_DHT_connect (cfg, 1024);
- open_port();
+ open_port ();
GNUNET_SCHEDULER_add_now (publish_names, NULL);
GNUNET_SERVER_add_handlers (server, handlers);
GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
- &cleanup_task,
- cls);
+ &cleanup_task, cls);
}
/**
projects / oweals / gnunet.git / blobdiff