/*
This file is part of GNUnet
- (C) 2010 Christian Grothoff (and other contributing authors)
+ (C) 2010, 2011 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
/**
* @file transport/plugin_transport_udp.c
- * @brief Implementation of the UDP NAT punching
- * transport service
+ * @brief Implementation of the UDP transport protocol
* @author Christian Grothoff
* @author Nathan Evans
- *
- * The idea with this transport is to connect gnunet peers to each other
- * when ONE is behind a NAT. This is based on pwnat (http://samy.pl/pwnat)
- * created by Samy Kamkar. When configured with the PWNAT options, this
- * transport will start a server daemon which sends dummy ICMP and UDP
- * messages out to a predefined address (typically 1.2.3.4).
- *
- * When a non-NAT'd peer (the client) learns of the NAT'd peer (the server)
- * address, it will send ICMP RESPONSES to the NAT'd peers external address.
- * The NAT box should forward these faked responses to the server, which
- * can then connect directly to the non-NAT'd peer.
+ * @author Matthias Wachs
*/
-
#include "platform.h"
+#include "plugin_transport_udp.h"
#include "gnunet_hello_lib.h"
-#include "gnunet_connection_lib.h"
-#include "gnunet_container_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_fragmentation_lib.h"
#include "gnunet_nat_lib.h"
-#include "gnunet_os_lib.h"
-#include "gnunet_peerinfo_service.h"
#include "gnunet_protocols.h"
#include "gnunet_resolver_service.h"
-#include "gnunet_server_lib.h"
#include "gnunet_signatures.h"
+#include "gnunet_constants.h"
#include "gnunet_statistics_service.h"
#include "gnunet_transport_service.h"
#include "gnunet_transport_plugin.h"
#include "transport.h"
-#define DEBUG_UDP GNUNET_NO
-
-#define MAX_PROBES 20
-
-/*
- * Transport cost to peer, always 1 for UDP (direct connection)
- */
-#define UDP_DIRECT_DISTANCE 1
-
-#define DEFAULT_NAT_PORT 0
+#define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
-/**
- * How long until we give up on transmitting the welcome message?
- */
-#define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
/**
- * Starting port for listening and sending, eventually a config value
+ * Number of messages we can defragment in parallel. We only really
+ * defragment 1 message at a time, but if messages get re-ordered, we
+ * may want to keep knowledge about the previous message to avoid
+ * discarding the current message in favor of a single fragment of a
+ * previous message. 3 should be good since we don't expect massive
+ * message reorderings with UDP.
*/
-#define UDP_NAT_DEFAULT_PORT 22086
+#define UDP_MAX_MESSAGES_IN_DEFRAG 3
/**
- * UDP Message-Packet header.
+ * We keep a defragmentation queue per sender address. How many
+ * sender addresses do we support at the same time? Memory consumption
+ * is roughly a factor of 32k * UDP_MAX_MESSAGES_IN_DEFRAG times this
+ * value. (So 128 corresponds to 12 MB and should suffice for
+ * connecting to roughly 128 peers via UDP).
*/
-struct UDPMessage
-{
- /**
- * Message header.
- */
- struct GNUNET_MessageHeader header;
+#define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
- /**
- * What is the identity of the sender (GNUNET_hash of public key)
- */
- struct GNUNET_PeerIdentity sender;
-};
/**
- * Network format for IPv4 addresses.
+ * Closure for 'append_port'.
*/
-struct IPv4UdpAddress
+struct PrettyPrinterContext
{
/**
- * IPv4 address, in network byte order.
+ * Function to call with the result.
*/
- uint32_t ipv4_addr GNUNET_PACKED;
-
- /**
- * Port number, in network byte order.
- */
- uint16_t u4_port GNUNET_PACKED;
-};
-
+ GNUNET_TRANSPORT_AddressStringCallback asc;
-/**
- * Network format for IPv6 addresses.
- */
-struct IPv6UdpAddress
-{
/**
- * IPv6 address.
+ * Clsoure for 'asc'.
*/
- struct in6_addr ipv6_addr GNUNET_PACKED;
+ void *asc_cls;
/**
- * Port number, in network byte order.
+ * Port to add after the IP address.
*/
- uint16_t u6_port GNUNET_PACKED;
-};
-
-/* Forward definition */
-struct Plugin;
-
-struct PrettyPrinterContext
-{
- GNUNET_TRANSPORT_AddressStringCallback asc;
- void *asc_cls;
uint16_t port;
};
-struct MessageQueue
+struct Session
{
/**
- * Linked List
+ * Which peer is this session for?
*/
- struct MessageQueue *next;
+ struct GNUNET_PeerIdentity target;
/**
- * Session this message belongs to
+ * Address of the other peer
*/
- struct PeerSession *session;
+ const struct sockaddr *sock_addr;
- /**
- * Actual message to be sent
- */
- char *msgbuf;
+ size_t addrlen;
/**
- * Size of message buffer to be sent
+ * Desired delay for next sending we send to other peer
*/
- size_t msgbuf_size;
+ struct GNUNET_TIME_Relative flow_delay_for_other_peer;
/**
- * When to discard this message
+ * Desired delay for next sending we received from other peer
*/
- struct GNUNET_TIME_Absolute timeout;
+ struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
/**
- * Continuation to call when this message goes out
+ * expected delay for ACKs
*/
- GNUNET_TRANSPORT_TransmitContinuation cont;
+ struct GNUNET_TIME_Relative last_expected_delay;
- /**
- * closure for continuation
- */
- void *cont_cls;
+ struct GNUNET_ATS_Information ats;
+
+ struct FragmentationContext * frag_ctx;
};
-/**
- * UDP NAT Probe message definition
- */
-struct UDP_NAT_ProbeMessage
-{
- /**
- * Message header
- */
- struct GNUNET_MessageHeader header;
+struct SessionCompareContext
+{
+ struct Session *res;
+ const struct GNUNET_HELLO_Address *addr;
};
+
/**
- * UDP NAT Probe message reply definition
+ * Closure for 'process_inbound_tokenized_messages'
*/
-struct UDP_NAT_ProbeMessageReply
+struct SourceInformation
{
/**
- * Message header
+ * Sender identity.
*/
- struct GNUNET_MessageHeader header;
-
-};
+ struct GNUNET_PeerIdentity sender;
+ /**
+ * Source address.
+ */
+ const void *arg;
-/**
- * UDP NAT Probe message confirm definition
- */
-struct UDP_NAT_ProbeMessageConfirmation
-{
/**
- * Message header
+ * Number of bytes in source address.
*/
- struct GNUNET_MessageHeader header;
+ size_t args;
+ struct Session *session;
};
/**
- * UDP NAT "Session"
+ * Closure for 'find_receive_context'.
*/
-struct PeerSession
+struct FindReceiveContext
{
-
- /**
- * Stored in a linked list.
- */
- struct PeerSession *next;
-
- /**
- * Pointer to the global plugin struct.
- */
- struct Plugin *plugin;
-
- /**
- * To whom are we talking to (set to our identity
- * if we are still waiting for the welcome message)
- */
- struct GNUNET_PeerIdentity target;
-
/**
- * Address of the other peer (either based on our 'connect'
- * call or on our 'accept' call).
+ * Where to store the result.
*/
- void *connect_addr;
+ struct DefragContext *rc;
/**
- * Length of connect_addr.
+ * Address to find.
*/
- size_t connect_alen;
+ const struct sockaddr *addr;
/**
- * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
+ * Number of bytes in 'addr'.
*/
- int expecting_welcome;
+ socklen_t addr_len;
- /**
- * From which socket do we need to send to this peer?
- */
- struct GNUNET_NETWORK_Handle *sock;
+ struct Session *session;
+};
- /*
- * Queue of messages for this peer, in the case that
- * we have to await a connection...
- */
- struct MessageQueue *messages;
-};
-struct UDP_NAT_Probes
+/**
+ * Data structure to track defragmentation contexts based
+ * on the source of the UDP traffic.
+ */
+struct DefragContext
{
/**
- * Linked list
+ * Defragmentation context.
*/
- struct UDP_NAT_Probes *next;
-
- /**
- * Timeout for this set of probes
- */
- struct GNUNET_TIME_Absolute timeout;
+ struct GNUNET_DEFRAGMENT_Context *defrag;
/**
- * Count of how many probes we've attempted
+ * Source address this receive context is for (allocated at the
+ * end of the struct).
*/
- int count;
+ const struct sockaddr *src_addr;
/**
- * The plugin this probe belongs to
+ * Reference to master plugin struct.
*/
struct Plugin *plugin;
/**
- * The task used to send these probes
+ * Node in the defrag heap.
*/
- GNUNET_SCHEDULER_TaskIdentifier task;
+ struct GNUNET_CONTAINER_HeapNode *hnode;
/**
- * Network address (always ipv4!)
+ * Length of 'src_addr'
*/
- struct IPv4UdpAddress addr;
-
+ size_t addr_len;
};
+
/**
- * Information we keep for each of our listen sockets.
+ * Closure for 'process_inbound_tokenized_messages'
*/
-struct UDP_Sock_Info
+struct FragmentationContext
{
+ struct FragmentationContext * next;
+ struct FragmentationContext * prev;
+
+ struct Plugin * plugin;
+ struct GNUNET_FRAGMENT_Context * frag;
+ struct Session * session;
+
+ struct GNUNET_TIME_Absolute timeout;
+
+
/**
- * The network handle
+ * Function to call upon completion of the transmission.
*/
- struct GNUNET_NETWORK_Handle *desc;
+ GNUNET_TRANSPORT_TransmitContinuation cont;
/**
- * The port we bound to
+ * Closure for 'cont'.
*/
- uint16_t port;
+ void *cont_cls;
+
+ size_t bytes_to_send;
};
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin
+struct UDPMessageWrapper
{
- /**
- * Our environment.
- */
- struct GNUNET_TRANSPORT_PluginEnvironment *env;
-
- /*
- * Session of peers with whom we are currently connected
- */
- struct PeerSession *sessions;
+ struct Session *session;
+ struct UDPMessageWrapper *prev;
+ struct UDPMessageWrapper *next;
+ char *udp;
+ size_t msg_size;
- /**
- * ID of select task
- */
- GNUNET_SCHEDULER_TaskIdentifier select_task;
+ struct GNUNET_TIME_Absolute timeout;
/**
- * Port to listen on.
+ * Function to call upon completion of the transmission.
*/
- uint16_t port;
+ GNUNET_TRANSPORT_TransmitContinuation cont;
/**
- * Address we were told to bind to exclusively (IPv4).
+ * Closure for 'cont'.
*/
- char *bind_address;
+ void *cont_cls;
- /**
- * Address we were told to bind to exclusively (IPv6).
- */
- char *bind6_address;
+ struct FragmentationContext *frag_ctx;
- /**
- * Handle to NAT traversal support.
- */
- struct GNUNET_NAT_Handle *nat;
+};
- /**
- * FD Read set
- */
- struct GNUNET_NETWORK_FDSet *rs;
+/**
+ * UDP ACK Message-Packet header (after defragmentation).
+ */
+struct UDP_ACK_Message
+{
/**
- * Probes in flight
+ * Message header.
*/
- struct UDP_NAT_Probes *probes;
+ struct GNUNET_MessageHeader header;
/**
- * socket that we transmit all IPv4 data with
+ * Desired delay for flow control
*/
- struct UDP_Sock_Info udp_sockv4;
+ uint32_t delay;
/**
- * socket that we transmit all IPv6 data with
+ * What is the identity of the sender
*/
- struct UDP_Sock_Info udp_sockv6;
+ struct GNUNET_PeerIdentity sender;
};
-
/**
- * Forward declaration.
+ * We have been notified that our readset has something to read. We don't
+ * know which socket needs to be read, so we have to check each one
+ * Then reschedule this function to be called again once more is available.
+ *
+ * @param cls the plugin handle
+ * @param tc the scheduling context (for rescheduling this function again)
*/
static void
-udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
-
+udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
/**
- * Disconnect from a remote node. Clean up session if we have one for this peer
+ * We have been notified that our readset has something to read. We don't
+ * know which socket needs to be read, so we have to check each one
+ * Then reschedule this function to be called again once more is available.
*
- * @param cls closure for this call (should be handle to Plugin)
- * @param target the peeridentity of the peer to disconnect
- * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
+ * @param cls the plugin handle
+ * @param tc the scheduling context (for rescheduling this function again)
*/
static void
-udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
+udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
+
+/**
+ * Function called for a quick conversion of the binary address to
+ * a numeric address. Note that the caller must not free the
+ * address and that the next call to this function is allowed
+ * to override the address again.
+ *
+ * @param cls closure
+ * @param addr binary address
+ * @param addrlen length of the address
+ * @return string representing the same address
+ */
+const char *
+udp_address_to_string (void *cls, const void *addr, size_t addrlen)
{
- /** TODO: Implement! */
- return;
+ static char rbuf[INET6_ADDRSTRLEN + 10];
+ char buf[INET6_ADDRSTRLEN];
+ const void *sb;
+ struct in_addr a4;
+ struct in6_addr a6;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ int af;
+ uint16_t port;
+
+ if (addrlen == sizeof (struct IPv6UdpAddress))
+ {
+ t6 = addr;
+ af = AF_INET6;
+ port = ntohs (t6->u6_port);
+ memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
+ sb = &a6;
+ }
+ else if (addrlen == sizeof (struct IPv4UdpAddress))
+ {
+ t4 = addr;
+ af = AF_INET;
+ port = ntohs (t4->u4_port);
+ memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
+ sb = &a4;
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
+ GNUNET_snprintf (rbuf, sizeof (rbuf), (af == AF_INET6) ? "[%s]:%u" : "%s:%u",
+ buf, port);
+ return rbuf;
}
-struct PeerSession *
-find_session (struct Plugin *plugin,
- const struct GNUNET_PeerIdentity *peer)
+/**
+ * Function called to convert a string address to
+ * a binary address.
+ *
+ * @param cls closure ('struct Plugin*')
+ * @param addr string address
+ * @param addrlen length of the address
+ * @param buf location to store the buffer
+ * @param added location to store the number of bytes in the buffer.
+ * If the function returns GNUNET_SYSERR, its contents are undefined.
+ * @return GNUNET_OK on success, GNUNET_SYSERR on failure
+ */
+int
+udp_string_to_address (void *cls, const char *addr, uint16_t addrlen,
+ void **buf, size_t *added)
{
- struct PeerSession *pos;
+ struct sockaddr_storage socket_address;
+ int ret = GNUNET_STRINGS_to_address_ip (addr, addrlen,
+ &socket_address);
- pos = plugin->sessions;
- while (pos != NULL)
- {
- if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
- return pos;
- pos = pos->next;
- }
+ if (ret != GNUNET_OK)
+ return GNUNET_SYSERR;
- return pos;
+ if (socket_address.ss_family == AF_INET)
+ {
+ struct IPv4UdpAddress *u4;
+ struct sockaddr_in *in4 = (struct sockaddr_in *) &socket_address;
+ u4 = GNUNET_malloc (sizeof (struct IPv4UdpAddress));
+ u4->ipv4_addr = in4->sin_addr.s_addr;
+ u4->u4_port = in4->sin_port;
+ *buf = u4;
+ *added = sizeof (struct IPv4UdpAddress);
+ }
+ else if (socket_address.ss_family == AF_INET6)
+ {
+ struct IPv6UdpAddress *u6;
+ struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &socket_address;
+ u6 = GNUNET_malloc (sizeof (struct IPv6UdpAddress));
+ u6->ipv6_addr = in6->sin6_addr;
+ u6->u6_port = in6->sin6_port;
+ *buf = u6;
+ *added = sizeof (struct IPv6UdpAddress);
+ }
+ return GNUNET_SYSERR;
}
/**
- * Actually send out the message, assume we've got the address and
- * send_handle squared away!
+ * Append our port and forward the result.
*
- * @param cls closure
- * @param send_handle which handle to send message on
- * @param target who should receive this message (ignored by UDP)
- * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
- * @param msgbuf_size the size of the msgbuf to send
- * @param priority how important is the message (ignored by UDP)
- * @param timeout when should we time out (give up) if we can not transmit?
- * @param addr the addr to send the message to, needs to be a sockaddr for us
- * @param addrlen the len of addr
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...)
- * @param cont_cls closure for cont
- * @return the number of bytes written
+ * @param cls a 'struct PrettyPrinterContext'
+ * @param hostname result from DNS resolver
*/
-static ssize_t
-udp_real_send (void *cls,
- struct GNUNET_NETWORK_Handle *send_handle,
- const struct GNUNET_PeerIdentity *target,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative timeout,
- const void *addr,
- size_t addrlen,
- GNUNET_TRANSPORT_TransmitContinuation cont,
- void *cont_cls)
+static void
+append_port (void *cls, const char *hostname)
{
- struct Plugin *plugin = cls;
- struct UDPMessage *message;
- int ssize;
- ssize_t sent;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4UdpAddress *t4;
- const struct IPv6UdpAddress *t6;
- const void *sb;
- size_t sbs;
+ struct PrettyPrinterContext *ppc = cls;
+ char *ret;
- if (send_handle == NULL)
- {
- /* failed to open send socket for AF */
- if (cont != NULL)
- cont (cont_cls, target, GNUNET_SYSERR);
- return 0;
- }
- if ((addr == NULL) || (addrlen == 0))
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "udp_real_send called without address, returning!\n");
-#endif
- if (cont != NULL)
- cont (cont_cls, target, GNUNET_SYSERR);
- return 0; /* Can never send if we don't have an address!! */
- }
+ if (hostname == NULL)
+ {
+ ppc->asc (ppc->asc_cls, NULL);
+ GNUNET_free (ppc);
+ return;
+ }
+ GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
+ ppc->asc (ppc->asc_cls, ret);
+ GNUNET_free (ret);
+}
- /* Build the message to be sent */
- message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
- ssize = sizeof (struct UDPMessage) + msgbuf_size;
- message->header.size = htons (ssize);
- message->header.type = htons (0);
- memcpy (&message->sender, plugin->env->my_identity,
- sizeof (struct GNUNET_PeerIdentity));
- memcpy (&message[1], msgbuf, msgbuf_size);
+/**
+ * Convert the transports address to a nice, human-readable
+ * format.
+ *
+ * @param cls closure
+ * @param type name of the transport that generated the address
+ * @param addr one of the addresses of the host, NULL for the last address
+ * the specific address format depends on the transport
+ * @param addrlen length of the address
+ * @param numeric should (IP) addresses be displayed in numeric form?
+ * @param timeout after how long should we give up?
+ * @param asc function to call on each string
+ * @param asc_cls closure for asc
+ */
+static void
+udp_plugin_address_pretty_printer (void *cls, const char *type,
+ const void *addr, size_t addrlen,
+ int numeric,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_TRANSPORT_AddressStringCallback asc,
+ void *asc_cls)
+{
+ struct PrettyPrinterContext *ppc;
+ const void *sb;
+ size_t sbs;
+ struct sockaddr_in a4;
+ struct sockaddr_in6 a6;
+ const struct IPv4UdpAddress *u4;
+ const struct IPv6UdpAddress *u6;
+ uint16_t port;
if (addrlen == sizeof (struct IPv6UdpAddress))
- {
- t6 = addr;
- memset (&a6, 0, sizeof (a6));
+ {
+ u6 = addr;
+ memset (&a6, 0, sizeof (a6));
+ a6.sin6_family = AF_INET6;
#if HAVE_SOCKADDR_IN_SIN_LEN
- a6.sin6_len = sizeof (a6);
+ a6.sin6_len = sizeof (a6);
#endif
- a6.sin6_family = AF_INET6;
- a6.sin6_port = t6->u6_port;
- memcpy (&a6.sin6_addr,
- &t6->ipv6_addr,
- sizeof (struct in6_addr));
- sb = &a6;
- sbs = sizeof (a6);
- }
+ a6.sin6_port = u6->u6_port;
+ memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof (struct in6_addr));
+ port = ntohs (u6->u6_port);
+ sb = &a6;
+ sbs = sizeof (a6);
+ }
else if (addrlen == sizeof (struct IPv4UdpAddress))
- {
- t4 = addr;
- memset (&a4, 0, sizeof (a4));
+ {
+ u4 = addr;
+ memset (&a4, 0, sizeof (a4));
+ a4.sin_family = AF_INET;
#if HAVE_SOCKADDR_IN_SIN_LEN
- a4.sin_len = sizeof (a4);
+ a4.sin_len = sizeof (a4);
#endif
- a4.sin_family = AF_INET;
- a4.sin_port = t4->u4_port;
- a4.sin_addr.s_addr = t4->ipv4_addr;
- sb = &a4;
- sbs = sizeof (a4);
- }
+ a4.sin_port = u4->u4_port;
+ a4.sin_addr.s_addr = u4->ipv4_addr;
+ port = ntohs (u4->u4_port);
+ sb = &a4;
+ sbs = sizeof (a4);
+ }
else
- {
- GNUNET_break_op (0);
- GNUNET_free (message);
- return -1;
- }
+ {
+ /* invalid address */
+ GNUNET_break_op (0);
+ asc (asc_cls, NULL);
+ return;
+ }
+ ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
+ ppc->asc = asc;
+ ppc->asc_cls = asc_cls;
+ ppc->port = port;
+ GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
+}
- /* Actually send the message */
- sent =
- GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
- sb,
- sbs);
- if (GNUNET_SYSERR == sent)
- GNUNET_log_strerror(GNUNET_ERROR_TYPE_DEBUG, "sendto");
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- "UDP transmit %u-byte message to %s (%d: %s)\n",
- (unsigned int) ssize,
- GNUNET_a2s (sb, sbs),
- (int) sent,
- (sent < 0) ? STRERROR (errno) : "ok");
- if (cont != NULL)
- {
- if (sent == GNUNET_SYSERR)
- cont (cont_cls, target, GNUNET_SYSERR);
- else
- {
- cont (cont_cls, target, GNUNET_OK);
- }
- }
- GNUNET_free (message);
- return sent;
+/**
+ * Check if the given port is plausible (must be either our listen
+ * port or our advertised port). If it is neither, we return
+ * GNUNET_SYSERR.
+ *
+ * @param plugin global variables
+ * @param in_port port number to check
+ * @return GNUNET_OK if port is either open_port or adv_port
+ */
+static int
+check_port (struct Plugin *plugin, uint16_t in_port)
+{
+ if ((in_port == plugin->port) || (in_port == plugin->aport))
+ return GNUNET_OK;
+ return GNUNET_SYSERR;
}
+
/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin.
+ * Function that will be called to check if a binary address for this
+ * plugin is well-formed and corresponds to an address for THIS peer
+ * (as per our configuration). Naturally, if absolutely necessary,
+ * plugins can be a bit conservative in their answer, but in general
+ * plugins should make sure that the address does not redirect
+ * traffic to a 3rd party that might try to man-in-the-middle our
+ * traffic.
*
- * @param cls closure
- * @param target who should receive this message (ignored by UDP)
- * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
- * @param msgbuf_size the size of the msgbuf to send
- * @param priority how important is the message (ignored by UDP)
- * @param timeout when should we time out (give up) if we can not transmit?
- * @param session identifier used for this session (can be NULL)
- * @param addr the addr to send the message to, needs to be a sockaddr for us
- * @param addrlen the len of addr
- * @param force_address not used, we had better have an address to send to
- * because we are stateless!!
- * @param cont continuation to call once the message has
- * been transmitted (or if the transport is ready
- * for the next transmission call; or if the
- * peer disconnected...)
- * @param cont_cls closure for cont
+ * @param cls closure, should be our handle to the Plugin
+ * @param addr pointer to the address
+ * @param addrlen length of addr
+ * @return GNUNET_OK if this is a plausible address for this peer
+ * and transport, GNUNET_SYSERR if not
*
- * @return the number of bytes written (may return 0 and the message can
- * still be transmitted later!)
*/
-static ssize_t
-udp_plugin_send (void *cls,
- const struct GNUNET_PeerIdentity *target,
- const char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative timeout,
- struct Session *session,
- const void *addr,
- size_t addrlen,
- int force_address,
- GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+static int
+udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
{
struct Plugin *plugin = cls;
- ssize_t sent;
- struct MessageQueue *temp_message;
- struct PeerSession *peer_session;
- int other_peer_natd;
- const struct IPv4UdpAddress *t4;
- struct sockaddr_in sin4;
+ struct IPv4UdpAddress *v4;
+ struct IPv6UdpAddress *v6;
- if (force_address == GNUNET_SYSERR)
+ if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
+ (addrlen != sizeof (struct IPv6UdpAddress)))
+ {
+ GNUNET_break_op (0);
return GNUNET_SYSERR;
- GNUNET_assert (NULL == session);
-
- other_peer_natd = GNUNET_NO;
- if (addrlen == sizeof(struct IPv4UdpAddress))
- {
- t4 = addr;
- if (ntohs(t4->u4_port) == 0)
- other_peer_natd = GNUNET_YES;
- }
- else if (addrlen != sizeof(struct IPv6UdpAddress))
+ }
+ if (addrlen == sizeof (struct IPv4UdpAddress))
+ {
+ v4 = (struct IPv4UdpAddress *) addr;
+ if (GNUNET_OK != check_port (plugin, ntohs (v4->u4_port)))
+ return GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ GNUNET_NAT_test_address (plugin->nat, &v4->ipv4_addr,
+ sizeof (struct in_addr)))
+ return GNUNET_SYSERR;
+ }
+ else
+ {
+ v6 = (struct IPv6UdpAddress *) addr;
+ if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
{
- GNUNET_break_op(0);
- return -1; /* Must have an address to send to */
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
}
+ if (GNUNET_OK != check_port (plugin, ntohs (v6->u6_port)))
+ return GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ GNUNET_NAT_test_address (plugin->nat, &v6->ipv6_addr,
+ sizeof (struct in6_addr)))
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Destroy a session, plugin is being unloaded.
+ *
+ * @param cls unused
+ * @param key hash of public key of target peer
+ * @param value a 'struct PeerSession*' to clean up
+ * @return GNUNET_OK (continue to iterate)
+ */
+static int
+disconnect_and_free_it (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct Plugin *plugin = cls;
+ struct Session *s = value;
+ struct UDPMessageWrapper *udpw;
+ struct UDPMessageWrapper *next;
- sent = 0;
- if ( (other_peer_natd == GNUNET_YES) &&
- (addrlen == sizeof(struct IPv4UdpAddress)) )
- {
- peer_session = find_session(plugin, target);
- if (peer_session == NULL) /* We have a new peer to add */
- {
- /*
- * The first time, we can assume we have no knowledge of a
- * working port for this peer, call the ICMP/UDP message sender
- * and wait...
- */
- peer_session = GNUNET_malloc(sizeof(struct PeerSession));
- peer_session->connect_addr = GNUNET_malloc(addrlen);
- memcpy(peer_session->connect_addr, addr, addrlen);
- peer_session->connect_alen = addrlen;
- peer_session->plugin = plugin;
- peer_session->sock = NULL;
- memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
- peer_session->expecting_welcome = GNUNET_YES;
-
- peer_session->next = plugin->sessions;
- plugin->sessions = peer_session;
-
- peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
- peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
- memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
- peer_session->messages->msgbuf_size = msgbuf_size;
- peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
- peer_session->messages->cont = cont;
- peer_session->messages->cont_cls = cont_cls;
#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
-#endif
- memset (&sin4, 0, sizeof (sin4));
- sin4.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
- sin4.sin_len = sizeof (sin4);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Session %p to peer `%s' address ended \n",
+ s,
+ GNUNET_i2s (&s->target),
+ GNUNET_a2s (s->sock_addr, s->addrlen));
#endif
- sin4.sin_port = t4->u4_port;
- sin4.sin_addr.s_addr = t4->ipv4_addr;
- GNUNET_NAT_run_client (plugin->nat, &sin4);
- }
- else
- {
- if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
- {
- sent = udp_real_send(cls,
- peer_session->sock,
- target,
- msgbuf, msgbuf_size,
- priority, timeout,
- peer_session->connect_addr, peer_session->connect_alen,
- cont, cont_cls);
- }
- else /* Haven't gotten a response from this peer, queue message */
- {
- temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
- temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
- memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
- temp_message->msgbuf_size = msgbuf_size;
- temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
- temp_message->cont = cont;
- temp_message->cont_cls = cont_cls;
- temp_message->next = peer_session->messages;
- peer_session->messages = temp_message;
- }
- }
- }
- else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
+
+ if (s->frag_ctx != NULL)
+ {
+ GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
+ GNUNET_free (s->frag_ctx);
+ s->frag_ctx = NULL;
+ }
+
+ udpw = plugin->ipv4_queue_head;
+ while (udpw != NULL)
+ {
+ next = udpw->next;
+ if (udpw->session == s)
{
- sent = udp_real_send(cls,
- (addrlen == sizeof (struct IPv4UdpAddress)) ? plugin->udp_sockv4.desc : plugin->udp_sockv6.desc,
- target,
- msgbuf, msgbuf_size,
- priority, timeout, addr, addrlen,
- cont, cont_cls);
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
+ GNUNET_free (udpw);
}
- else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
+ udpw = next;
+ }
+
+ udpw = plugin->ipv6_queue_head;
+ while (udpw != NULL)
+ {
+ next = udpw->next;
+ if (udpw->session == s)
{
- return GNUNET_SYSERR;
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
+
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &s->target, GNUNET_SYSERR);
+ GNUNET_free (udpw);
}
+ udpw = next;
+ }
- /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
- * the callback so must not return GNUNET_SYSERR!
- * If we did, then transport context would get freed twice. */
- if (sent == GNUNET_SYSERR)
- return 0;
- return sent;
+ plugin->env->session_end (plugin->env->cls, &s->target, s);
+
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
+ &s->target.hashPubKey,
+ s));
+
+
+ GNUNET_free (s);
+ return GNUNET_OK;
}
/**
- * Send UDP probe messages or UDP keepalive messages, depending on the
- * state of the connection.
+ * Disconnect from a remote node. Clean up session if we have one for this peer
*
- * @param cls closure for this call (should be the main Plugin)
- * @param tc task context for running this
+ * @param cls closure for this call (should be handle to Plugin)
+ * @param target the peeridentity of the peer to disconnect
+ * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
*/
static void
-send_udp_probe_message (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
{
- struct UDP_NAT_Probes *probe = cls;
- struct UDP_NAT_ProbeMessage message;
- struct Plugin *plugin = probe->plugin;
-
- memset (&message, 0, sizeof (message));
- message.header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
- message.header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
- /* If they gave us a port, use that. If not, try our port. */
- if (ntohs(probe->addr.u4_port) == 0)
- probe->addr.u4_port = htons(plugin->port);
+ struct Plugin *plugin = cls;
+ GNUNET_assert (plugin != NULL);
+ GNUNET_assert (target != NULL);
#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Sending a probe to port %d\n"), ntohs(probe->addr.u4_port));
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
#endif
- probe->count++;
- udp_real_send(plugin,
- plugin->udp_sockv4.desc,
- NULL,
- (char *)&message, ntohs(message.header.size), 0,
- GNUNET_TIME_relative_get_unit(),
- &probe->addr, sizeof(struct IPv4UdpAddress),
- &udp_probe_continuation, probe);
+ /* Clean up sessions */
+ GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
}
-
-/**
- * Continuation for probe sends. If the last probe was sent
- * "successfully", schedule sending of another one. If not,
- * FIXME...
- */
-static void
-udp_probe_continuation (void *cls,
- const struct GNUNET_PeerIdentity *target,
- int result)
+static struct Session *
+create_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *target,
+ const void *addr, size_t addrlen,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
{
- struct UDP_NAT_Probes *probe = cls;
- /*struct Plugin *plugin = probe->plugin;*/
+ struct Session *s;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ struct sockaddr_in *v4;
+ struct sockaddr_in6 *v6;
+ size_t len;
- if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
+ switch (addrlen)
+ {
+ case sizeof (struct IPv4UdpAddress):
+ if (NULL == plugin->sockv4)
{
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Scheduling next probe for 10000 milliseconds\n"));
-#endif
- probe->task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 10),
- &send_udp_probe_message, probe);
+ return NULL;
}
- else /* Destroy the probe context. */
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Sending probe didn't go well...\n"));
+ t4 = addr;
+ s = GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in));
+ len = sizeof (struct sockaddr_in);
+ v4 = (struct sockaddr_in *) &s[1];
+ v4->sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v4->sin_len = sizeof (struct sockaddr_in);
#endif
+ v4->sin_port = t4->u4_port;
+ v4->sin_addr.s_addr = t4->ipv4_addr;
+ s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v4, sizeof (struct sockaddr_in));
+ break;
+ case sizeof (struct IPv6UdpAddress):
+ if (NULL == plugin->sockv6)
+ {
+ return NULL;
}
-}
+ t6 = addr;
+ s =
+ GNUNET_malloc (sizeof (struct Session) + sizeof (struct sockaddr_in6));
+ len = sizeof (struct sockaddr_in6);
+ v6 = (struct sockaddr_in6 *) &s[1];
+ v6->sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v6->sin6_len = sizeof (struct sockaddr_in6);
+#endif
+ v6->sin6_port = t6->u6_port;
+ v6->sin6_addr = t6->ipv6_addr;
+ s->ats = plugin->env->get_address_type (plugin->env->cls, (const struct sockaddr *) v6, sizeof (struct sockaddr_in6));
+ break;
+ default:
+ /* Must have a valid address to send to */
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ s->addrlen = len;
+ s->target = *target;
+ s->sock_addr = (const struct sockaddr *) &s[1];
+ s->flow_delay_for_other_peer = GNUNET_TIME_relative_get_zero();
+ s->flow_delay_from_other_peer = GNUNET_TIME_absolute_get_zero();
+ s->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
-/**
- * FIXME.
- */
-static void
-udp_plugin_reversal_callback (void *cls,
- const struct sockaddr *addr,
- socklen_t addrlen)
+ return s;
+}
+
+static int session_cmp_it (void *cls,
+ const GNUNET_HashCode * key,
+ void *value)
{
- struct Plugin *plugin = cls;
- struct UDP_NAT_Probes *temp_probe;
- const struct sockaddr_in *inaddr;
+ struct SessionCompareContext * cctx = cls;
+ const struct GNUNET_HELLO_Address *address = cctx->addr;
+ struct Session *s = value;
- if (sizeof (struct sockaddr_in) != addrlen)
+ socklen_t s_addrlen = s->addrlen;
+
+#if VERBOSE_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Comparing address %s <-> %s\n",
+ udp_address_to_string (NULL, (void *) address->address, address->address_length),
+ GNUNET_a2s (s->sock_addr, s->addrlen));
+#endif
+
+ if ((address->address_length == sizeof (struct IPv4UdpAddress)) &&
+ (s_addrlen == sizeof (struct sockaddr_in)))
+ {
+ struct IPv4UdpAddress * u4 = NULL;
+ u4 = (struct IPv4UdpAddress *) address->address;
+ const struct sockaddr_in *s4 = (const struct sockaddr_in *) s->sock_addr;
+ if ((0 == memcmp ((const void *) &u4->ipv4_addr,(const void *) &s4->sin_addr, sizeof (struct in_addr))) &&
+ (u4->u4_port == s4->sin_port))
+ {
+ cctx->res = s;
+ return GNUNET_NO;
+ }
+
+ }
+ if ((address->address_length == sizeof (struct IPv6UdpAddress)) &&
+ (s_addrlen == sizeof (struct sockaddr_in6)))
+ {
+ struct IPv6UdpAddress * u6 = NULL;
+ u6 = (struct IPv6UdpAddress *) address->address;
+ const struct sockaddr_in6 *s6 = (const struct sockaddr_in6 *) s->sock_addr;
+ if ((0 == memcmp (&u6->ipv6_addr, &s6->sin6_addr, sizeof (struct in6_addr))) &&
+ (u6->u6_port == s6->sin6_port))
{
- GNUNET_break (0);
- return;
+ cctx->res = s;
+ return GNUNET_NO;
}
- inaddr = (const struct sockaddr_in *) addr;
- temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
- temp_probe->addr.ipv4_addr = inaddr->sin_addr.s_addr;
- temp_probe->addr.u4_port = inaddr->sin_port;
- temp_probe->next = plugin->probes;
- temp_probe->plugin = plugin;
- temp_probe->task = GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500),
- &send_udp_probe_message,
- temp_probe);
- plugin->probes = temp_probe;
+ }
+
+
+ return GNUNET_YES;
}
/**
- * Demultiplexer for UDP NAT messages
+ * Creates a new outbound session the transport service will use to send data to the
+ * peer
*
- * @param plugin the main plugin for this transport
- * @param sender from which peer the message was received
- * @param currhdr pointer to the header of the message
- * @param sender_addr the address from which the message was received
- * @param fromlen the length of the address
- * @param sockinfo which socket did we receive the message on
+ * @param cls the plugin
+ * @param address the address
+ * @return the session or NULL of max connections exceeded
*/
-static void
-udp_demultiplexer(struct Plugin *plugin,
- struct GNUNET_PeerIdentity *sender,
- const struct GNUNET_MessageHeader *currhdr,
- const void *sender_addr,
- size_t fromlen, struct UDP_Sock_Info *sockinfo)
+static struct Session *
+udp_plugin_get_session (void *cls,
+ const struct GNUNET_HELLO_Address *address)
{
- struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
- struct PeerSession *peer_session;
- struct MessageQueue *pending_message;
- struct MessageQueue *pending_message_temp;
- uint16_t incoming_port;
- struct GNUNET_TRANSPORT_ATS_Information distance[2];
- if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
- {
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
- _("Received a message from myself, dropping!!!\n"));
-#endif
- return;
- }
+ struct Session * s = NULL;
+ struct Plugin * plugin = cls;
+ struct IPv6UdpAddress * udp_a6;
+ struct IPv4UdpAddress * udp_a4;
- incoming_port = 0;
- GNUNET_assert(sender_addr != NULL); /* Can recvfrom have a NULL address? */
- if (fromlen == sizeof(struct IPv4UdpAddress))
- {
- incoming_port = ntohs(((struct IPv4UdpAddress *)sender_addr)->u4_port);
- }
- else if (fromlen == sizeof(struct IPv6UdpAddress))
- {
- incoming_port = ntohs(((struct IPv6UdpAddress *)sender_addr)->u6_port);
- }
+ GNUNET_assert (plugin != NULL);
+ GNUNET_assert (address != NULL);
- switch (ntohs(currhdr->type))
- {
- case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
- /* Send probe reply */
- outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
- outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
- outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received a probe on listen port %d, sent_from port %d\n"),
- sockinfo->port, incoming_port);
-#endif
+ if ((address->address == NULL) ||
+ ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
+ (address->address_length != sizeof (struct IPv6UdpAddress))))
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
- udp_real_send(plugin, sockinfo->desc, NULL,
- (char *)outgoing_probe_reply,
- ntohs(outgoing_probe_reply->header.size), 0,
- GNUNET_TIME_relative_get_unit(),
- sender_addr, fromlen,
- NULL, NULL);
+ if (address->address_length == sizeof (struct IPv4UdpAddress))
+ {
+ if (plugin->sockv4 == NULL)
+ return NULL;
+ udp_a4 = (struct IPv4UdpAddress *) address->address;
+ if (udp_a4->u4_port == 0)
+ return NULL;
+ }
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Sent PROBE REPLY to port %d on outgoing port %d\n"),
- incoming_port, sockinfo->port);
-#endif
- GNUNET_free(outgoing_probe_reply);
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
- /* Check for existing probe, check ports returned, send confirmation if all is well */
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received PROBE REPLY from port %d on incoming port %d\n"), incoming_port, sockinfo->port);
-#endif
- if (fromlen == sizeof(struct IPv4UdpAddress))
- {
- /* FIXME! */
-#if 0
- struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
- struct UDP_NAT_Probes *outgoing_probe;
- outgoing_probe = find_probe(plugin, &addr_buf[0]);
- if (outgoing_probe != NULL)
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Sending confirmation that we were reached!\n"));
-#endif
- outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
- outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
- outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
- udp_real_send(plugin, sockinfo->desc, NULL,
- (char *)outgoing_probe_confirmation,
- ntohs(outgoing_probe_confirmation->header.size), 0,
- GNUNET_TIME_relative_get_unit(),
- sender_addr, fromlen, NULL, NULL);
-
- if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel(outgoing_probe->task);
- outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
- /* Schedule task to timeout and remove probe if confirmation not received */
- }
- GNUNET_free(outgoing_probe_confirmation);
- }
- else
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received a probe reply, but have no record of a sent probe!\n"));
-#endif
- }
-#endif
- }
- else
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received a probe reply, but sender address size is WRONG (should be %d, is %d)!\n"), sizeof(struct IPv4UdpAddress), fromlen);
-#endif
- }
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
- peer_session = find_session(plugin, sender);
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
-#endif
- if (peer_session == NULL) /* Shouldn't this NOT happen? */
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
-#endif
- peer_session = GNUNET_malloc(sizeof(struct PeerSession));
- peer_session->connect_addr = GNUNET_malloc(fromlen);
- memcpy(peer_session->connect_addr, sender_addr, fromlen);
- peer_session->connect_alen = fromlen;
- peer_session->plugin = plugin;
- peer_session->sock = sockinfo->desc;
- memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
- peer_session->expecting_welcome = GNUNET_NO;
-
- peer_session->next = plugin->sessions;
- plugin->sessions = peer_session;
-
- peer_session->messages = NULL;
- }
- else if (peer_session->expecting_welcome == GNUNET_YES)
- {
- peer_session->expecting_welcome = GNUNET_NO;
- peer_session->sock = sockinfo->desc;
- if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
- {
- ((struct IPv4UdpAddress *)peer_session->connect_addr)->u4_port = htons(incoming_port);
- }
- else if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
- {
- ((struct IPv6UdpAddress *)peer_session->connect_addr)->u6_port = htons(incoming_port);
- }
+ if (address->address_length == sizeof (struct IPv6UdpAddress))
+ {
+ if (plugin->sockv6 == NULL)
+ return NULL;
+ udp_a6 = (struct IPv6UdpAddress *) address->address;
+ if (udp_a6->u6_port == 0)
+ return NULL;
+ }
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received a probe confirmation, will send to peer on port %d\n"), incoming_port);
-#endif
- if (peer_session->messages != NULL)
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received a probe confirmation, sending queued messages.\n"));
-#endif
- pending_message = peer_session->messages;
- int count = 0;
- while (pending_message != NULL)
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("sending queued message %d\n"), count);
-#endif
- udp_real_send(plugin,
- peer_session->sock,
- &peer_session->target,
- pending_message->msgbuf,
- pending_message->msgbuf_size, 0,
- GNUNET_TIME_relative_get_unit(),
- peer_session->connect_addr,
- peer_session->connect_alen,
- pending_message->cont,
- pending_message->cont_cls);
-
- pending_message_temp = pending_message;
- pending_message = pending_message->next;
- GNUNET_free(pending_message_temp->msgbuf);
- GNUNET_free(pending_message_temp);
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("finished sending queued message %d\n"), count);
+ /* check if session already exists */
+ struct SessionCompareContext cctx;
+ cctx.addr = address;
+ cctx.res = NULL;
+#if VERBOSE_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Looking for existing session for peer `%s' `%s' \n", GNUNET_i2s (&address->peer), udp_address_to_string(NULL, address->address, address->address_length));
#endif
- count++;
- }
- }
-
- }
- else
- {
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- _("Received probe confirmation for already confirmed peer!\n"));
+ GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
+ if (cctx.res != NULL)
+ {
+#if VERBOSE_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
#endif
- }
- /* Received confirmation, add peer with address/port specified */
- break;
- case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
- /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
- /* If we receive these just ignore! */
- break;
- default:
+ return cctx.res;
+ }
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Sending message type %d to transport!\n",
- ntohs(currhdr->type));
+ /* otherwise create new */
+ s = create_session (plugin,
+ &address->peer,
+ address->address,
+ address->address_length,
+ NULL, NULL);
+#if VERBOSE
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating new session %p for peer `%s' address `%s'\n",
+ s,
+ GNUNET_i2s(&address->peer),
+ udp_address_to_string(NULL,address->address,address->address_length));
#endif
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
+ &s->target.hashPubKey,
+ s,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
- distance[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
- distance[0].value = htonl (UDP_DIRECT_DISTANCE);
- distance[1].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
- distance[1].value = htonl (0);
+ return s;
+}
- plugin->env->receive (plugin->env->cls, sender, currhdr,
- (const struct GNUNET_TRANSPORT_ATS_Information *) &distance, 2,
- NULL, sender_addr, fromlen);
- }
+static void enqueue (struct Plugin *plugin, struct UDPMessageWrapper * udpw)
+{
+ if (udpw->session->addrlen == sizeof (struct sockaddr_in))
+ GNUNET_CONTAINER_DLL_insert(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+ if (udpw->session->addrlen == sizeof (struct sockaddr_in6))
+ GNUNET_CONTAINER_DLL_insert(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
}
-
-/*
- * We have been notified that our writeset has something to read. We don't
- * know which socket needs to be read, so we have to check each one
- * Then reschedule this function to be called again once more is available.
+/**
+ * Function that is called with messages created by the fragmentation
+ * module. In the case of the 'proc' callback of the
+ * GNUNET_FRAGMENT_context_create function, this function must
+ * eventually call 'GNUNET_FRAGMENT_context_transmission_done'.
*
- * @param cls the plugin handle
- * @param tc the scheduling context (for rescheduling this function again)
+ * @param cls closure, the 'struct FragmentationContext'
+ * @param msg the message that was created
*/
static void
-udp_plugin_select (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
+enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
{
- struct Plugin *plugin = cls;
- char buf[65536];
- struct UDPMessage *msg;
- struct GNUNET_PeerIdentity sender;
- socklen_t fromlen;
- char addr[32];
- ssize_t ret;
- int offset;
- int tsize;
- char *msgbuf;
- const struct GNUNET_MessageHeader *currhdr;
- struct IPv4UdpAddress t4;
- struct IPv6UdpAddress t6;
- const struct sockaddr_in *s4;
- const struct sockaddr_in6 *s6;
- const void *ca;
- size_t calen;
- struct UDP_Sock_Info *udp_sock;
- uint16_t csize;
+ struct FragmentationContext *frag_ctx = cls;
+ struct Plugin *plugin = frag_ctx->plugin;
+ struct UDPMessageWrapper * udpw;
+ struct Session *s;
- plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
- if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
- return;
- udp_sock = NULL;
- if (GNUNET_NETWORK_fdset_isset (tc->read_ready,
- plugin->udp_sockv4.desc))
- udp_sock = &plugin->udp_sockv4;
- else if (GNUNET_NETWORK_fdset_isset (tc->read_ready,
- plugin->udp_sockv6.desc))
- udp_sock = &plugin->udp_sockv6;
- if (NULL == udp_sock)
- {
- GNUNET_break (0);
- return;
- }
- fromlen = sizeof (addr);
- memset (&addr, 0, sizeof(addr));
- ret =
- GNUNET_NETWORK_socket_recvfrom (udp_sock->desc, buf, sizeof (buf),
- (struct sockaddr *)&addr, &fromlen);
+ size_t msg_len = ntohs (msg->size);
- if (AF_INET == ((struct sockaddr *)addr)->sa_family)
- {
- s4 = (const struct sockaddr_in*) &addr;
- t4.u4_port = s4->sin_port;
- t4.ipv4_addr = s4->sin_addr.s_addr;
- ca = &t4;
- calen = sizeof (t4);
- }
- else if (AF_INET6 == ((struct sockaddr *)addr)->sa_family)
+#if VERBOSE_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
+#endif
+
+ udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msg_len);
+ udpw->session = frag_ctx->session;
+ s = udpw->session;
+ udpw->udp = (char *) &udpw[1];
+
+ udpw->msg_size = msg_len;
+ udpw->cont = frag_ctx->cont;
+ udpw->cont_cls = frag_ctx->cont_cls;
+ udpw->timeout = frag_ctx->timeout;
+ udpw->frag_ctx = frag_ctx;
+ memcpy (udpw->udp, msg, msg_len);
+
+ enqueue (plugin, udpw);
+
+
+ if (s->addrlen == sizeof (struct sockaddr_in))
+ {
+ if (plugin->with_v4_ws == GNUNET_NO)
{
- s6 = (const struct sockaddr_in6*) &addr;
- t6.u6_port = s6->sin6_port;
- memcpy (&t6.ipv6_addr,
- &s6->sin6_addr,
- sizeof (struct in6_addr));
- ca = &t6;
- calen = sizeof (t6);
+ if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel(plugin->select_task);
+
+ plugin->select_task =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v4,
+ plugin->ws_v4,
+ &udp_plugin_select, plugin);
+ plugin->with_v4_ws = GNUNET_YES;
}
- else
+ }
+
+ else if (s->addrlen == sizeof (struct sockaddr_in6))
+ {
+ if (plugin->with_v6_ws == GNUNET_NO)
{
- GNUNET_break (0);
- ca = NULL;
- calen = 0;
+ if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
+
+ plugin->select_task_v6 =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v6,
+ plugin->ws_v6,
+ &udp_plugin_select_v6, plugin);
+ plugin->with_v6_ws = GNUNET_YES;
}
- if (ret < sizeof (struct UDPMessage))
- {
- GNUNET_break_op (0);
- plugin->select_task =
- GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
- NULL, &udp_plugin_select, plugin);
- return;
- }
- msg = (struct UDPMessage *) buf;
- csize = ntohs (msg->header.size);
- if ( (csize < sizeof (struct UDPMessage)) ||
- (csize > ret) )
+ }
+
+}
+
+
+
+
+/**
+ * Function that can be used by the transport service to transmit
+ * a message using the plugin. Note that in the case of a
+ * peer disconnecting, the continuation MUST be called
+ * prior to the disconnect notification itself. This function
+ * will be called with this peer's HELLO message to initiate
+ * a fresh connection to another peer.
+ *
+ * @param cls closure
+ * @param s which session must be used
+ * @param msgbuf the message to transmit
+ * @param msgbuf_size number of bytes in 'msgbuf'
+ * @param priority how important is the message (most plugins will
+ * ignore message priority and just FIFO)
+ * @param to how long to wait at most for the transmission (does not
+ * require plugins to discard the message after the timeout,
+ * just advisory for the desired delay; most plugins will ignore
+ * this as well)
+ * @param cont continuation to call once the message has
+ * been transmitted (or if the transport is ready
+ * for the next transmission call; or if the
+ * peer disconnected...); can be NULL
+ * @param cont_cls closure for cont
+ * @return number of bytes used (on the physical network, with overheads);
+ * -1 on hard errors (i.e. address invalid); 0 is a legal value
+ * and does NOT mean that the message was not transmitted (DV)
+ */
+static ssize_t
+udp_plugin_send (void *cls,
+ struct Session *s,
+ const char *msgbuf, size_t msgbuf_size,
+ unsigned int priority,
+ struct GNUNET_TIME_Relative to,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+{
+ struct Plugin *plugin = cls;
+ size_t mlen = msgbuf_size + sizeof (struct UDPMessage);
+
+ struct UDPMessageWrapper * udpw;
+ struct UDPMessage *udp;
+ char mbuf[mlen];
+ GNUNET_assert (plugin != NULL);
+ GNUNET_assert (s != NULL);
+
+ if ((s->addrlen == sizeof (struct sockaddr_in6)) && (plugin->sockv6 == NULL))
+ return GNUNET_SYSERR;
+
+ if ((s->addrlen == sizeof (struct sockaddr_in)) && (plugin->sockv4 == NULL))
+ return GNUNET_SYSERR;
+
+
+ if (mlen >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_contains_value(plugin->sessions, &s->target.hashPubKey, s))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP transmits %u-byte message to `%s' using address `%s'\n",
+ msgbuf_size,
+ GNUNET_i2s (&s->target),
+ GNUNET_a2s(s->sock_addr, s->addrlen));
+
+ /* Message */
+ udp = (struct UDPMessage *) mbuf;
+ udp->header.size = htons (mlen);
+ udp->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE);
+ udp->reserved = htonl (0);
+ udp->sender = *plugin->env->my_identity;
+
+ if (mlen <= UDP_MTU)
+ {
+ udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + mlen);
+ udpw->session = s;
+ udpw->udp = (char *) &udpw[1];
+ udpw->msg_size = mlen;
+ udpw->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
+ udpw->cont = cont;
+ udpw->cont_cls = cont_cls;
+ udpw->frag_ctx = NULL;
+
+ memcpy (udpw->udp, udp, sizeof (struct UDPMessage));
+ memcpy (&udpw->udp[sizeof (struct UDPMessage)], msgbuf, msgbuf_size);
+
+ enqueue (plugin, udpw);
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP has to fragment message \n");
+ if (s->frag_ctx != NULL)
+ return GNUNET_SYSERR;
+ memcpy (&udp[1], msgbuf, msgbuf_size);
+ struct FragmentationContext * frag_ctx = GNUNET_malloc(sizeof (struct FragmentationContext));
+
+ frag_ctx->plugin = plugin;
+ frag_ctx->session = s;
+ frag_ctx->cont = cont;
+ frag_ctx->cont_cls = cont_cls;
+ frag_ctx->timeout = GNUNET_TIME_absolute_add(GNUNET_TIME_absolute_get(), to);
+ frag_ctx->bytes_to_send = mlen;
+ frag_ctx->frag = GNUNET_FRAGMENT_context_create (plugin->env->stats,
+ UDP_MTU,
+ &plugin->tracker,
+ s->last_expected_delay,
+ &udp->header,
+ &enqueue_fragment,
+ frag_ctx);
+
+ s->frag_ctx = frag_ctx;
+
+ }
+
+ if (s->addrlen == sizeof (struct sockaddr_in))
+ {
+ if (plugin->with_v4_ws == GNUNET_NO)
{
- GNUNET_break_op (0);
+ if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel(plugin->select_task);
+
plugin->select_task =
- GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
- NULL, &udp_plugin_select, plugin);
- return;
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v4,
+ plugin->ws_v4,
+ &udp_plugin_select, plugin);
+ plugin->with_v4_ws = GNUNET_YES;
}
- msgbuf = (char *)&msg[1];
- memcpy (&sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
- offset = 0;
- tsize = csize - sizeof (struct UDPMessage);
- while (offset + sizeof (struct GNUNET_MessageHeader) <= tsize)
+ }
+
+ else if (s->addrlen == sizeof (struct sockaddr_in6))
+ {
+ if (plugin->with_v6_ws == GNUNET_NO)
{
- currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
- csize = ntohs (currhdr->size);
- if ( (csize < sizeof (struct GNUNET_MessageHeader)) ||
- (csize > tsize - offset) )
- {
- GNUNET_break_op (0);
- break;
- }
- udp_demultiplexer(plugin, &sender, currhdr,
- ca, calen, udp_sock);
- offset += csize;
+ if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel(plugin->select_task_v6);
+
+ plugin->select_task_v6 =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v6,
+ plugin->ws_v6,
+ &udp_plugin_select_v6, plugin);
+ plugin->with_v6_ws = GNUNET_YES;
}
- plugin->select_task =
- GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
- NULL, &udp_plugin_select, plugin);
+ }
+ return mlen;
}
/**
- * Check if the given port is plausible (must be either
- * our listen port or our advertised port). If it is
- * neither, we return GNUNET_SYSERR.
+ * Our external IP address/port mapping has changed.
*
- * @param plugin global variables
- * @param in_port port number to check
- * @return GNUNET_OK if port is either open_port or adv_port
+ * @param cls closure, the 'struct LocalAddrList'
+ * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
+ * the previous (now invalid) one
+ * @param addr either the previous or the new public IP address
+ * @param addrlen actual lenght of the address
*/
-static int
-check_port (struct Plugin *plugin, uint16_t in_port)
+static void
+udp_nat_port_map_callback (void *cls, int add_remove,
+ const struct sockaddr *addr, socklen_t addrlen)
{
- if (in_port == 0)
- return GNUNET_OK;
- if (in_port == plugin->port)
- return GNUNET_OK;
- return GNUNET_SYSERR;
+ struct Plugin *plugin = cls;
+ struct IPv4UdpAddress u4;
+ struct IPv6UdpAddress u6;
+ void *arg;
+ size_t args;
+
+ /* convert 'addr' to our internal format */
+ switch (addr->sa_family)
+ {
+ case AF_INET:
+ GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
+ u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
+ u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
+ arg = &u4;
+ args = sizeof (u4);
+ break;
+ case AF_INET6:
+ GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
+ memcpy (&u6.ipv6_addr, &((struct sockaddr_in6 *) addr)->sin6_addr,
+ sizeof (struct in6_addr));
+ u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
+ arg = &u6;
+ args = sizeof (u6);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+ /* modify our published address list */
+ plugin->env->notify_address (plugin->env->cls, add_remove, arg, args);
}
+
/**
- * Function that will be called to check if a binary address for this
- * plugin is well-formed and corresponds to an address for THIS peer
- * (as per our configuration). Naturally, if absolutely necessary,
- * plugins can be a bit conservative in their answer, but in general
- * plugins should make sure that the address does not redirect
- * traffic to a 3rd party that might try to man-in-the-middle our
- * traffic.
+ * Message tokenizer has broken up an incomming message. Pass it on
+ * to the service.
*
- * @param cls closure, should be our handle to the Plugin
- * @param addr pointer to the address
- * @param addrlen length of addr
- * @return GNUNET_OK if this is a plausible address for this peer
- * and transport, GNUNET_SYSERR if not
+ * @param cls the 'struct Plugin'
+ * @param client the 'struct SourceInformation'
+ * @param hdr the actual message
+ */
+static void
+process_inbound_tokenized_messages (void *cls, void *client,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct Plugin *plugin = cls;
+ struct SourceInformation *si = client;
+ struct GNUNET_ATS_Information ats[2];
+ struct GNUNET_TIME_Relative delay;
+
+ GNUNET_assert (si->session != NULL);
+ /* setup ATS */
+ ats[0].type = htonl (GNUNET_ATS_QUALITY_NET_DISTANCE);
+ ats[0].value = htonl (1);
+ ats[1] = si->session->ats;
+ GNUNET_break (ntohl(ats[1].value) != GNUNET_ATS_NET_UNSPECIFIED);
+
+ delay = plugin->env->receive (plugin->env->cls,
+ &si->sender,
+ hdr,
+ (const struct GNUNET_ATS_Information *) &ats, 2,
+ NULL,
+ si->arg,
+ si->args);
+ si->session->flow_delay_for_other_peer = delay;
+}
+
+
+/**
+ * We've received a UDP Message. Process it (pass contents to main service).
+ *
+ * @param plugin plugin context
+ * @param msg the message
+ * @param sender_addr sender address
+ * @param sender_addr_len number of bytes in sender_addr
+ */
+static void
+process_udp_message (struct Plugin *plugin, const struct UDPMessage *msg,
+ const struct sockaddr *sender_addr,
+ socklen_t sender_addr_len)
+{
+ struct SourceInformation si;
+ struct Session * s = NULL;
+ struct IPv4UdpAddress u4;
+ struct IPv6UdpAddress u6;
+ const void *arg;
+ size_t args;
+
+ if (0 != ntohl (msg->reserved))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ if (ntohs (msg->header.size) <
+ sizeof (struct GNUNET_MessageHeader) + sizeof (struct UDPMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ /* convert address */
+ switch (sender_addr->sa_family)
+ {
+ case AF_INET:
+ GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in));
+ u4.ipv4_addr = ((struct sockaddr_in *) sender_addr)->sin_addr.s_addr;
+ u4.u4_port = ((struct sockaddr_in *) sender_addr)->sin_port;
+ arg = &u4;
+ args = sizeof (u4);
+ break;
+ case AF_INET6:
+ GNUNET_assert (sender_addr_len == sizeof (struct sockaddr_in6));
+ u6.ipv6_addr = ((struct sockaddr_in6 *) sender_addr)->sin6_addr;
+ u6.u6_port = ((struct sockaddr_in6 *) sender_addr)->sin6_port;
+ arg = &u6;
+ args = sizeof (u6);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Received message with %u bytes from peer `%s' at `%s'\n",
+ (unsigned int) ntohs (msg->header.size), GNUNET_i2s (&msg->sender),
+ GNUNET_a2s (sender_addr, sender_addr_len));
+#endif
+
+ struct GNUNET_HELLO_Address * address = GNUNET_HELLO_address_allocate(&msg->sender, "udp", arg, args);
+ s = udp_plugin_get_session(plugin, address);
+ GNUNET_free (address);
+
+ /* iterate over all embedded messages */
+ si.session = s;
+ si.sender = msg->sender;
+ si.arg = arg;
+ si.args = args;
+
+ GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
+ ntohs (msg->header.size) -
+ sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
+}
+
+
+/**
+ * Scan the heap for a receive context with the given address.
*
+ * @param cls the 'struct FindReceiveContext'
+ * @param node internal node of the heap
+ * @param element value stored at the node (a 'struct ReceiveContext')
+ * @param cost cost associated with the node
+ * @return GNUNET_YES if we should continue to iterate,
+ * GNUNET_NO if not.
*/
static int
-udp_plugin_check_address (void *cls,
- const void *addr,
- size_t addrlen)
+find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
+ void *element, GNUNET_CONTAINER_HeapCostType cost)
{
- struct Plugin *plugin = cls;
- struct IPv4UdpAddress *v4;
- struct IPv6UdpAddress *v6;
+ struct FindReceiveContext *frc = cls;
+ struct DefragContext *e = element;
- if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
- (addrlen != sizeof (struct IPv6UdpAddress)))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (addrlen == sizeof (struct IPv4UdpAddress))
- {
- v4 = (struct IPv4UdpAddress *) addr;
- if (GNUNET_OK !=
- check_port (plugin, ntohs (v4->u4_port)))
- return GNUNET_SYSERR;
- if (GNUNET_OK !=
- GNUNET_NAT_test_address (plugin->nat,
- &v4->ipv4_addr, sizeof (struct in_addr)))
- return GNUNET_SYSERR;
- }
- else
- {
- v6 = (struct IPv6UdpAddress *) addr;
- if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- if (GNUNET_OK !=
- check_port (plugin, ntohs (v6->u6_port)))
- return GNUNET_SYSERR;
- if (GNUNET_OK !=
- GNUNET_NAT_test_address (plugin->nat,
- &v6->ipv6_addr, sizeof (struct in6_addr)))
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
+ if ((frc->addr_len == e->addr_len) &&
+ (0 == memcmp (frc->addr, e->src_addr, frc->addr_len)))
+ {
+ frc->rc = e;
+ return GNUNET_NO;
+ }
+ return GNUNET_YES;
}
/**
- * Append our port and forward the result.
+ * Process a defragmented message.
+ *
+ * @param cls the 'struct ReceiveContext'
+ * @param msg the message
*/
static void
-append_port (void *cls, const char *hostname)
+fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
{
- struct PrettyPrinterContext *ppc = cls;
- char *ret;
+ struct DefragContext *rc = cls;
- if (hostname == NULL)
- {
- ppc->asc (ppc->asc_cls, NULL);
- GNUNET_free (ppc);
- return;
- }
- GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
- ppc->asc (ppc->asc_cls, ret);
- GNUNET_free (ret);
+ if (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE)
+ {
+ GNUNET_break (0);
+ return;
+ }
+ if (ntohs (msg->size) < sizeof (struct UDPMessage))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ process_udp_message (rc->plugin, (const struct UDPMessage *) msg,
+ rc->src_addr, rc->addr_len);
}
+struct LookupContext
+{
+ const struct sockaddr * addr;
+ size_t addrlen;
+
+ struct Session *res;
+};
+
+static int
+lookup_session_by_addr_it (void *cls, const GNUNET_HashCode * key, void *value)
+{
+ struct LookupContext *l_ctx = cls;
+ struct Session * s = value;
+
+ if ((s->addrlen == l_ctx->addrlen) &&
+ (0 == memcmp (s->sock_addr, l_ctx->addr, s->addrlen)))
+ {
+ l_ctx->res = s;
+ return GNUNET_NO;
+ }
+ return GNUNET_YES;
+}
/**
- * Convert the transports address to a nice, human-readable
- * format.
+ * Transmit an acknowledgement.
*
- * @param cls closure
- * @param type name of the transport that generated the address
- * @param addr one of the addresses of the host, NULL for the last address
- * the specific address format depends on the transport
- * @param addrlen length of the address
- * @param numeric should (IP) addresses be displayed in numeric form?
- * @param timeout after how long should we give up?
- * @param asc function to call on each string
- * @param asc_cls closure for asc
+ * @param cls the 'struct ReceiveContext'
+ * @param id message ID (unused)
+ * @param msg ack to transmit
*/
static void
-udp_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressStringCallback asc,
- void *asc_cls)
+ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
{
- struct PrettyPrinterContext *ppc;
- const void *sb;
- size_t sbs;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4UdpAddress *u4;
- const struct IPv6UdpAddress *u6;
- uint16_t port;
+ struct DefragContext *rc = cls;
+
+ size_t msize = sizeof (struct UDP_ACK_Message) + ntohs (msg->size);
+ struct UDP_ACK_Message *udp_ack;
+ uint32_t delay = 0;
+ struct UDPMessageWrapper *udpw;
+ struct Session *s;
+
+ struct LookupContext l_ctx;
+ l_ctx.addr = rc->src_addr;
+ l_ctx.addrlen = rc->addr_len;
+ l_ctx.res = NULL;
+ GNUNET_CONTAINER_multihashmap_iterate (rc->plugin->sessions,
+ &lookup_session_by_addr_it,
+ &l_ctx);
+ s = l_ctx.res;
+
+ if (NULL == s)
+ return;
- if (addrlen == sizeof (struct IPv6UdpAddress))
+ if (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
+ delay = s->flow_delay_for_other_peer.rel_value;
+
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Sending ACK to `%s' including delay of %u ms\n",
+ GNUNET_a2s (rc->src_addr,
+ (rc->src_addr->sa_family ==
+ AF_INET) ? sizeof (struct sockaddr_in) : sizeof (struct
+ sockaddr_in6)),
+ delay);
+#endif
+ udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
+ udpw->cont = NULL;
+ udpw->cont_cls = NULL;
+ udpw->frag_ctx = NULL;
+ udpw->msg_size = msize;
+ udpw->session = s;
+ udpw->timeout = GNUNET_TIME_absolute_get_forever();
+ udpw->udp = (char *)&udpw[1];
+
+ udp_ack = (struct UDP_ACK_Message *) udpw->udp;
+ udp_ack->header.size = htons ((uint16_t) msize);
+ udp_ack->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK);
+ udp_ack->delay = htonl (delay);
+ udp_ack->sender = *rc->plugin->env->my_identity;
+ memcpy (&udp_ack[1], msg, ntohs (msg->size));
+
+ enqueue (rc->plugin, udpw);
+}
+
+
+static void read_process_msg (struct Plugin *plugin,
+ const struct GNUNET_MessageHeader *msg,
+ char *addr,
+ socklen_t fromlen)
+{
+ if (ntohs (msg->size) < sizeof (struct UDPMessage))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ process_udp_message (plugin, (const struct UDPMessage *) msg,
+ (const struct sockaddr *) addr, fromlen);
+ return;
+}
+
+static void read_process_ack (struct Plugin *plugin,
+ const struct GNUNET_MessageHeader *msg,
+ char *addr,
+ socklen_t fromlen)
+{
+ const struct GNUNET_MessageHeader *ack;
+ const struct UDP_ACK_Message *udp_ack;
+ struct LookupContext l_ctx;
+ struct Session *s = NULL;
+ struct GNUNET_TIME_Relative flow_delay;
+
+ if (ntohs (msg->size) <
+ sizeof (struct UDP_ACK_Message) + sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ udp_ack = (const struct UDP_ACK_Message *) msg;
+
+ l_ctx.addr = (const struct sockaddr *) addr;
+ l_ctx.addrlen = fromlen;
+ l_ctx.res = NULL;
+ GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions,
+ &lookup_session_by_addr_it,
+ &l_ctx);
+ s = l_ctx.res;
+
+ if ((s == NULL) || (s->frag_ctx == NULL))
+ return;
+
+ flow_delay.rel_value = (uint64_t) ntohl (udp_ack->delay);
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "We received a sending delay of %llu\n",
+ flow_delay.rel_value);
+ s->flow_delay_from_other_peer =
+ GNUNET_TIME_relative_to_absolute (flow_delay);
+
+ ack = (const struct GNUNET_MessageHeader *) &udp_ack[1];
+ if (ntohs (ack->size) !=
+ ntohs (msg->size) - sizeof (struct UDP_ACK_Message))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ if (GNUNET_OK != GNUNET_FRAGMENT_process_ack (s->frag_ctx->frag, ack))
+ {
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP processes %u-byte acknowledgement from `%s' at `%s'\n",
+ (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+#endif
+ return;
+ }
+
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "FULL MESSAGE ACKed\n",
+ (unsigned int) ntohs (msg->size), GNUNET_i2s (&udp_ack->sender),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+#endif
+ s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
+
+ struct UDPMessageWrapper * udpw = NULL;
+ if (s->addrlen == sizeof (struct sockaddr_in6))
+ {
+ udpw = plugin->ipv6_queue_head;
+ while (udpw!= NULL)
{
- u6 = addr;
- memset (&a6, 0, sizeof (a6));
- a6.sin6_family = AF_INET6;
- a6.sin6_port = u6->u6_port;
- memcpy (&a6.sin6_addr,
- &u6->ipv6_addr,
- sizeof (struct in6_addr));
- port = ntohs (u6->u6_port);
- sb = &a6;
- sbs = sizeof (a6);
+ if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
+ {
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
+ GNUNET_free (udpw);
+ }
+ udpw = udpw->next;
}
- else if (addrlen == sizeof (struct IPv4UdpAddress))
+ }
+ if (s->addrlen == sizeof (struct sockaddr_in))
+ {
+ udpw = plugin->ipv4_queue_head;
+ while (udpw!= NULL)
{
- u4 = addr;
- memset (&a4, 0, sizeof (a4));
- a4.sin_family = AF_INET;
- a4.sin_port = u4->u4_port;
- a4.sin_addr.s_addr = u4->ipv4_addr;
- port = ntohs (u4->u4_port);
- sb = &a4;
- sbs = sizeof (a4);
+ if ((udpw->frag_ctx != NULL) && (udpw->frag_ctx == s->frag_ctx))
+ {
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+ GNUNET_free (udpw);
+ }
+ udpw = udpw->next;
}
+ }
+
+ if (s->frag_ctx->cont != NULL)
+ s->frag_ctx->cont
+ (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
+ GNUNET_free (s->frag_ctx);
+ s->frag_ctx = NULL;
+ return;
+}
+
+static void read_process_fragment (struct Plugin *plugin,
+ const struct GNUNET_MessageHeader *msg,
+ char *addr,
+ socklen_t fromlen)
+{
+ struct DefragContext *d_ctx;
+ struct GNUNET_TIME_Absolute now;
+ struct FindReceiveContext frc;
+
+
+ frc.rc = NULL;
+ frc.addr = (const struct sockaddr *) addr;
+ frc.addr_len = fromlen;
+
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "UDP processes %u-byte fragment from `%s'\n",
+ (unsigned int) ntohs (msg->size),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+#endif
+
+ /* Lookup existing receive context for this address */
+ GNUNET_CONTAINER_heap_iterate (plugin->defrag_ctxs,
+ &find_receive_context,
+ &frc);
+ now = GNUNET_TIME_absolute_get ();
+ d_ctx = frc.rc;
+
+ if (d_ctx == NULL)
+ {
+ /* Create a new defragmentation context */
+ d_ctx = GNUNET_malloc (sizeof (struct DefragContext) + fromlen);
+ memcpy (&d_ctx[1], addr, fromlen);
+ d_ctx->src_addr = (const struct sockaddr *) &d_ctx[1];
+ d_ctx->addr_len = fromlen;
+ d_ctx->plugin = plugin;
+ d_ctx->defrag =
+ GNUNET_DEFRAGMENT_context_create (plugin->env->stats, UDP_MTU,
+ UDP_MAX_MESSAGES_IN_DEFRAG, d_ctx,
+ &fragment_msg_proc, &ack_proc);
+ d_ctx->hnode =
+ GNUNET_CONTAINER_heap_insert (plugin->defrag_ctxs, d_ctx,
+ (GNUNET_CONTAINER_HeapCostType)
+ now.abs_value);
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Created new defragmentation context for %u-byte fragment from `%s'\n",
+ (unsigned int) ntohs (msg->size),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+#endif
+ }
else
+ {
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing defragmentation context for %u-byte fragment from `%s'\n",
+ (unsigned int) ntohs (msg->size),
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen));
+#endif
+ }
+
+ if (GNUNET_OK == GNUNET_DEFRAGMENT_process_fragment (d_ctx->defrag, msg))
+ {
+ /* keep this 'rc' from expiring */
+ GNUNET_CONTAINER_heap_update_cost (plugin->defrag_ctxs, d_ctx->hnode,
+ (GNUNET_CONTAINER_HeapCostType)
+ now.abs_value);
+ }
+ if (GNUNET_CONTAINER_heap_get_size (plugin->defrag_ctxs) >
+ UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG)
+ {
+ /* remove 'rc' that was inactive the longest */
+ d_ctx = GNUNET_CONTAINER_heap_remove_root (plugin->defrag_ctxs);
+ GNUNET_assert (NULL != d_ctx);
+ GNUNET_DEFRAGMENT_context_destroy (d_ctx->defrag);
+ GNUNET_free (d_ctx);
+ }
+}
+
+/**
+ * Read and process a message from the given socket.
+ *
+ * @param plugin the overall plugin
+ * @param rsock socket to read from
+ */
+static void
+udp_select_read (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *rsock)
+{
+ socklen_t fromlen;
+ char addr[32];
+ char buf[65536];
+ ssize_t size;
+ const struct GNUNET_MessageHeader *msg;
+
+ fromlen = sizeof (addr);
+ memset (&addr, 0, sizeof (addr));
+ size = GNUNET_NETWORK_socket_recvfrom (rsock, buf, sizeof (buf),
+ (struct sockaddr *) &addr, &fromlen);
+
+ if (size < sizeof (struct GNUNET_MessageHeader))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+ msg = (const struct GNUNET_MessageHeader *) buf;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP received %u-byte message from `%s' type %i\n", (unsigned int) size,
+ GNUNET_a2s ((const struct sockaddr *) addr, fromlen), ntohs (msg->type));
+
+ if (size != ntohs (msg->size))
+ {
+ GNUNET_break_op (0);
+ return;
+ }
+
+ switch (ntohs (msg->type))
+ {
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_BROADCAST_BEACON:
+ udp_broadcast_receive (plugin, &buf, size, addr, fromlen);
+ return;
+
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_MESSAGE:
+ read_process_msg (plugin, msg, addr, fromlen);
+ return;
+
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_ACK:
+ read_process_ack (plugin, msg, addr, fromlen);;
+ return;
+
+ case GNUNET_MESSAGE_TYPE_FRAGMENT:
+ read_process_fragment (plugin, msg, addr, fromlen);
+ return;
+
+ default:
+ GNUNET_break_op (0);
+ return;
+ }
+}
+
+size_t
+udp_select_send (struct Plugin *plugin, struct GNUNET_NETWORK_Handle *sock)
+{
+ ssize_t sent;
+ size_t slen;
+ struct GNUNET_TIME_Absolute max;
+ struct GNUNET_TIME_Absolute ;
+
+ struct UDPMessageWrapper *udpw = NULL;
+
+ if (sock == plugin->sockv4)
+ {
+ udpw = plugin->ipv4_queue_head;
+ }
+ else if (sock == plugin->sockv6)
+ {
+ udpw = plugin->ipv6_queue_head;
+ }
+ else
+ {
+ GNUNET_break (0);
+ return 0;
+ }
+
+ const struct sockaddr * sa = udpw->session->sock_addr;
+ slen = udpw->session->addrlen;
+
+ max = GNUNET_TIME_absolute_max(udpw->timeout, GNUNET_TIME_absolute_get());
+
+ while (udpw != NULL)
+ {
+ if (max.abs_value != udpw->timeout.abs_value)
{
- /* invalid address */
- GNUNET_break_op (0);
- asc (asc_cls, NULL);
- return;
+ /* Message timed out */
+
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
+ if (udpw->frag_ctx != NULL)
+ {
+#if DEBUG_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Fragmented message for peer `%s' with size %u timed out\n",
+ GNUNET_i2s(&udpw->session->target), udpw->frag_ctx->bytes_to_send);
+#endif
+ udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
+ GNUNET_free (udpw->frag_ctx);
+ udpw->session->frag_ctx = NULL;
+ }
+ else
+ {
+#if DEBUG_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' with size %u timed out\n",
+ GNUNET_i2s(&udpw->session->target), udpw->msg_size);
+#endif
+ }
+
+ if (sock == plugin->sockv4)
+ {
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+ GNUNET_free (udpw);
+ udpw = plugin->ipv4_queue_head;
+ }
+ else if (sock == plugin->sockv6)
+ {
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
+ GNUNET_free (udpw);
+ udpw = plugin->ipv6_queue_head;
+ }
}
- ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
- ppc->asc = asc;
- ppc->asc_cls = asc_cls;
- ppc->port = port;
- GNUNET_RESOLVER_hostname_get (sb,
- sbs,
- !numeric, timeout, &append_port, ppc);
-}
+ else
+ {
+ struct GNUNET_TIME_Relative delta = GNUNET_TIME_absolute_get_remaining (udpw->session->flow_delay_from_other_peer);
+ if (delta.rel_value == 0)
+ {
+ /* this message is not delayed */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is not delayed \n",
+ GNUNET_i2s(&udpw->session->target), udpw->msg_size);
+ break;
+ }
+ else
+ {
+ /* this message is delayed, try next */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Message for peer `%s' (%u bytes) is delayed for %llu \n",
+ GNUNET_i2s(&udpw->session->target), udpw->msg_size,
+ delta);
+ udpw = udpw->next;
+ }
+ }
+ }
+
+ if (udpw == NULL)
+ {
+ /* No message left */
+ return 0;
+ }
+
+ sent = GNUNET_NETWORK_socket_sendto (sock, udpw->udp, udpw->msg_size, sa, slen);
+
+ if (GNUNET_SYSERR == sent)
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ "UDP could not transmit %u-byte message to `%s': `%s'\n",
+ (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen),
+ STRERROR (errno));
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "UDP transmitted %u-byte message to `%s' (%d: %s)\n",
+ (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen), (int) sent,
+ (sent < 0) ? STRERROR (errno) : "ok");
+ }
+ /* This was just a message fragment */
+ if (udpw->frag_ctx != NULL)
+ {
+ GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
+ }
+ /* This was a complete message*/
+ else
+ {
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_OK);
+ }
+
+ if (sock == plugin->sockv4)
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+ else if (sock == plugin->sockv6)
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
+ GNUNET_free (udpw);
+ udpw = NULL;
+ return sent;
+}
/**
- * Function called for a quick conversion of the binary address to
- * a numeric address. Note that the caller must not free the
- * address and that the next call to this function is allowed
- * to override the address again.
+ * We have been notified that our readset has something to read. We don't
+ * know which socket needs to be read, so we have to check each one
+ * Then reschedule this function to be called again once more is available.
*
- * @param cls closure
- * @param addr binary address
- * @param addrlen length of the address
- * @return string representing the same address
+ * @param cls the plugin handle
+ * @param tc the scheduling context (for rescheduling this function again)
*/
-static const char*
-udp_address_to_string (void *cls,
- const void *addr,
- size_t addrlen)
+static void
+udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- static char rbuf[INET6_ADDRSTRLEN + 10];
- char buf[INET6_ADDRSTRLEN];
- const void *sb;
- struct in_addr a4;
- struct in6_addr a6;
- const struct IPv4UdpAddress *t4;
- const struct IPv6UdpAddress *t6;
- int af;
- uint16_t port;
+ struct Plugin *plugin = cls;
- if (addrlen == sizeof (struct IPv6UdpAddress))
- {
- t6 = addr;
- af = AF_INET6;
- port = ntohs (t6->u6_port);
- memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
- sb = &a6;
- }
- else if (addrlen == sizeof (struct IPv4UdpAddress))
- {
- t4 = addr;
- af = AF_INET;
- port = ntohs (t4->u4_port);
- memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
- sb = &a4;
- }
+ plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
+ plugin->with_v4_ws = GNUNET_NO;
+
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
+ {
+ if ((NULL != plugin->sockv4) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv4)))
+ udp_select_read (plugin, plugin->sockv4);
+
+ }
+
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
+ {
+ if ((NULL != plugin->sockv4) && (plugin->ipv4_queue_head != NULL) &&
+ (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv4)))
+ {
+ udp_select_send (plugin, plugin->sockv4);
+ }
+ }
+
+ if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (plugin->select_task);
+ plugin->select_task = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v4,
+ (plugin->ipv4_queue_head != NULL) ? plugin->ws_v4 : NULL,
+ &udp_plugin_select, plugin);
+ if (plugin->ipv4_queue_head != NULL)
+ plugin->with_v4_ws = GNUNET_YES;
else
- return NULL;
- inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
- GNUNET_snprintf (rbuf,
- sizeof (rbuf),
- "%s:%u",
- buf,
- port);
- return rbuf;
+ plugin->with_v4_ws = GNUNET_NO;
}
/**
- * Our external IP address/port mapping has changed.
+ * We have been notified that our readset has something to read. We don't
+ * know which socket needs to be read, so we have to check each one
+ * Then reschedule this function to be called again once more is available.
*
- * @param cls closure, the 'struct LocalAddrList'
- * @param add_remove GNUNET_YES to mean the new public IP address, GNUNET_NO to mean
- * the previous (now invalid) one
- * @param addr either the previous or the new public IP address
- * @param addrlen actual lenght of the address
+ * @param cls the plugin handle
+ * @param tc the scheduling context (for rescheduling this function again)
*/
static void
-udp_nat_port_map_callback (void *cls,
- int add_remove,
- const struct sockaddr *addr,
- socklen_t addrlen)
+udp_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
struct Plugin *plugin = cls;
- struct IPv4UdpAddress u4;
- struct IPv6UdpAddress u6;
- void *arg;
- size_t args;
- /* convert 'addr' to our internal format */
- switch (addr->sa_family)
+ plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
+ return;
+
+ plugin->with_v6_ws = GNUNET_NO;
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_READ_READY) != 0)
+ {
+ if ((NULL != plugin->sockv6) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready, plugin->sockv6)))
+ udp_select_read (plugin, plugin->sockv6);
+ }
+
+ if ((tc->reason & GNUNET_SCHEDULER_REASON_WRITE_READY) != 0)
+ {
+ if ((NULL != plugin->sockv6) && (plugin->ipv6_queue_head != NULL) &&
+ (GNUNET_NETWORK_fdset_isset (tc->write_ready, plugin->sockv6)))
+ {
+ udp_select_send (plugin, plugin->sockv6);
+ }
+ }
+ if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
+ GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
+ plugin->select_task_v6 = GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v6,
+ (plugin->ipv6_queue_head != NULL) ? plugin->ws_v6 : NULL,
+ &udp_plugin_select_v6, plugin);
+ if (plugin->ipv6_queue_head != NULL)
+ plugin->with_v6_ws = GNUNET_YES;
+ else
+ plugin->with_v6_ws = GNUNET_NO;
+}
+
+
+static int
+setup_sockets (struct Plugin *plugin, struct sockaddr_in6 *serverAddrv6, struct sockaddr_in *serverAddrv4)
+{
+ int tries;
+ int sockets_created = 0;
+ struct sockaddr *serverAddr;
+ struct sockaddr *addrs[2];
+ socklen_t addrlens[2];
+ socklen_t addrlen;
+
+ /* Create IPv6 socket */
+ if (plugin->enable_ipv6 == GNUNET_YES)
+ {
+ plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
+ if (NULL == plugin->sockv6)
{
- case AF_INET:
- GNUNET_assert (addrlen == sizeof (struct sockaddr_in));
- u4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
- u4.u4_port = ((struct sockaddr_in *) addr)->sin_port;
- arg = &u4;
- args = sizeof (u4);
- break;
- case AF_INET6:
- GNUNET_assert (addrlen == sizeof (struct sockaddr_in6));
- memcpy (&u6.ipv6_addr,
- &((struct sockaddr_in6 *) addr)->sin6_addr,
- sizeof (struct in6_addr));
- u6.u6_port = ((struct sockaddr_in6 *) addr)->sin6_port;
- arg = &u6;
- args = sizeof (u6);
- break;
- default:
- GNUNET_break (0);
- return;
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
+ plugin->enable_ipv6 = GNUNET_NO;
}
- /* modify our published address list */
- plugin->env->notify_address (plugin->env->cls,
- add_remove,
- arg, args);
+ else
+ {
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ serverAddrv6->sin6_len = sizeof (serverAddrv6);
+#endif
+ serverAddrv6->sin6_family = AF_INET6;
+ serverAddrv6->sin6_addr = in6addr_any;
+ serverAddrv6->sin6_port = htons (plugin->port);
+ addrlen = sizeof (struct sockaddr_in6);
+ serverAddr = (struct sockaddr *) serverAddrv6;
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
+ ntohs (serverAddrv6->sin6_port));
+#endif
+ tries = 0;
+ while (GNUNET_NETWORK_socket_bind (plugin->sockv6, serverAddr, addrlen) !=
+ GNUNET_OK)
+ {
+ serverAddrv6->sin6_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv6 Binding failed, trying new port %d\n",
+ ntohs (serverAddrv6->sin6_port));
+#endif
+ tries++;
+ if (tries > 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv6);
+ plugin->sockv6 = NULL;
+ break;
+ }
+ }
+ if (plugin->sockv6 != NULL)
+ {
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv6 socket created on port %d\n",
+ ntohs (serverAddrv6->sin6_port));
+#endif
+ addrs[sockets_created] = (struct sockaddr *) serverAddrv6;
+ addrlens[sockets_created] = sizeof (struct sockaddr_in6);
+ sockets_created++;
+ }
+ }
+ }
+
+ /* Create IPv4 socket */
+ plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
+ if (NULL == plugin->sockv4)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "socket");
+ }
+ else
+ {
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ serverAddrv4->sin_len = sizeof (serverAddrv4);
+#endif
+ serverAddrv4->sin_family = AF_INET;
+ serverAddrv4->sin_addr.s_addr = INADDR_ANY;
+ serverAddrv4->sin_port = htons (plugin->port);
+ addrlen = sizeof (struct sockaddr_in);
+ serverAddr = (struct sockaddr *) serverAddrv4;
+
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
+ ntohs (serverAddrv4->sin_port));
+#endif
+ tries = 0;
+ while (GNUNET_NETWORK_socket_bind (plugin->sockv4, serverAddr, addrlen) !=
+ GNUNET_OK)
+ {
+ serverAddrv4->sin_port = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
+ ntohs (serverAddrv4->sin_port));
+#endif
+ tries++;
+ if (tries > 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv4);
+ plugin->sockv4 = NULL;
+ break;
+ }
+ }
+ if (plugin->sockv4 != NULL)
+ {
+ addrs[sockets_created] = (struct sockaddr *) serverAddrv4;
+ addrlens[sockets_created] = sizeof (struct sockaddr_in);
+ sockets_created++;
+ }
+ }
+
+ /* Create file descriptors */
+ plugin->rs_v4 = GNUNET_NETWORK_fdset_create ();
+ plugin->ws_v4 = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_zero (plugin->rs_v4);
+ GNUNET_NETWORK_fdset_zero (plugin->ws_v4);
+ if (NULL != plugin->sockv4)
+ {
+ GNUNET_NETWORK_fdset_set (plugin->rs_v4, plugin->sockv4);
+ GNUNET_NETWORK_fdset_set (plugin->ws_v4, plugin->sockv4);
+ }
+
+ if (sockets_created == 0)
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
+
+ plugin->select_task =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v4,
+ NULL,
+ &udp_plugin_select, plugin);
+ plugin->with_v4_ws = GNUNET_NO;
+
+ if (plugin->enable_ipv6 == GNUNET_YES)
+ {
+ plugin->rs_v6 = GNUNET_NETWORK_fdset_create ();
+ plugin->ws_v6 = GNUNET_NETWORK_fdset_create ();
+ GNUNET_NETWORK_fdset_zero (plugin->rs_v6);
+ GNUNET_NETWORK_fdset_zero (plugin->ws_v6);
+ if (NULL != plugin->sockv6)
+ {
+ GNUNET_NETWORK_fdset_set (plugin->rs_v6, plugin->sockv6);
+ GNUNET_NETWORK_fdset_set (plugin->ws_v6, plugin->sockv6);
+ }
+
+ plugin->select_task_v6 =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ GNUNET_SCHEDULER_NO_TASK,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v6,
+ NULL,
+ &udp_plugin_select_v6, plugin);
+ plugin->with_v6_ws = GNUNET_NO;
+ }
+
+ plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
+ GNUNET_NO, plugin->port,
+ sockets_created,
+ (const struct sockaddr **) addrs, addrlens,
+ &udp_nat_port_map_callback, NULL, plugin);
+
+ return sockets_created;
}
/**
* The exported method. Makes the core api available via a global and
* returns the udp transport API.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
+ * @return our 'struct GNUNET_TRANSPORT_PluginFunctions'
*/
void *
libgnunet_plugin_transport_udp_init (void *cls)
{
struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
- unsigned long long mtu;
- unsigned long long port;
struct GNUNET_TRANSPORT_PluginFunctions *api;
struct Plugin *plugin;
- int sockets_created;
+
+ unsigned long long port;
+ unsigned long long aport;
+ unsigned long long broadcast;
+ unsigned long long udp_max_bps;
+ unsigned long long enable_v6;
+ char * bind4_address;
+ char * bind6_address;
+ struct GNUNET_TIME_Relative interval;
+
struct sockaddr_in serverAddrv4;
struct sockaddr_in6 serverAddrv6;
- struct sockaddr *serverAddr;
- struct sockaddr *addrs[2];
- socklen_t addrlens[2];
- socklen_t addrlen;
- unsigned int tries;
+ int res;
+
+ if (NULL == env->receive)
+ {
+ /* run in 'stub' mode (i.e. as part of gnunet-peerinfo), don't fully
+ initialze the plugin or the API */
+ api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
+ api->cls = NULL;
+ api->address_pretty_printer = &udp_plugin_address_pretty_printer;
+ api->address_to_string = &udp_address_to_string;
+ api->string_to_address = &udp_string_to_address;
+ return api;
+ }
+
+ /* Get port number */
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp", "PORT",
+ &port))
+ port = 2086;
if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-udp",
- "PORT",
- &port))
- port = UDP_NAT_DEFAULT_PORT;
+ GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
+ "ADVERTISED_PORT", &aport))
+ aport = port;
if (port > 65535)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Given `%s' option is out of range: %llu > %u\n"), "PORT", port,
+ 65535);
+ return NULL;
+ }
+
+ /* Protocols */
+ if ((GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "nat",
+ "DISABLEV6")))
+ {
+ enable_v6 = GNUNET_NO;
+ }
+ else
+ enable_v6 = GNUNET_YES;
+
+
+ /* Addresses */
+ memset (&serverAddrv6, 0, sizeof (serverAddrv6));
+ memset (&serverAddrv4, 0, sizeof (serverAddrv4));
+
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
+ "BINDTO", &bind4_address))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding udp plugin to specific address: `%s'\n",
+ bind4_address);
+ if (1 != inet_pton (AF_INET, bind4_address, &serverAddrv4.sin_addr))
+ {
+ GNUNET_free (bind4_address);
+ return NULL;
+ }
+ }
+
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_string (env->cfg, "transport-udp",
+ "BINDTO6", &bind6_address))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding udp plugin to specific address: `%s'\n",
+ bind6_address);
+ if (1 !=
+ inet_pton (AF_INET6, bind6_address, &serverAddrv6.sin6_addr))
{
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Given `%s' option is out of range: %llu > %u\n"),
- "PORT",
- port,
- 65535);
+ LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
+ bind6_address);
+ GNUNET_free_non_null (bind4_address);
+ GNUNET_free (bind6_address);
return NULL;
}
+ }
+
+
+ /* Enable neighbour discovery */
+ broadcast = GNUNET_CONFIGURATION_get_value_yesno (env->cfg, "transport-udp",
+ "BROADCAST");
+ if (broadcast == GNUNET_SYSERR)
+ broadcast = GNUNET_NO;
+
+ if (GNUNET_SYSERR == GNUNET_CONFIGURATION_get_value_time (env->cfg, "transport-udp",
+ "BROADCAST_INTERVAL", &interval))
+ {
+ interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
+ }
+
+ /* Maximum datarate */
+ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (env->cfg, "transport-udp",
+ "MAX_BPS", &udp_max_bps))
+ {
+ udp_max_bps = 1024 * 1024 * 50; /* 50 MB/s == infinity for practical purposes */
+ }
- mtu = 1240;
- if (mtu < 1200)
- GNUNET_log (GNUNET_ERROR_TYPE_INFO,
- _("MTU %llu for `%s' is probably too low!\n"), mtu,
- "UDP");
plugin = GNUNET_malloc (sizeof (struct Plugin));
+ api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
+
+ GNUNET_BANDWIDTH_tracker_init (&plugin->tracker,
+ GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
+
+
+ plugin->sessions = GNUNET_CONTAINER_multihashmap_create (10);
+ plugin->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ plugin->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, plugin);
plugin->port = port;
+ plugin->aport = aport;
+ plugin->broadcast_interval = interval;
+ plugin->enable_ipv6 = enable_v6;
plugin->env = env;
- api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
- api->cls = plugin;
- api->send = &udp_plugin_send;
+ api->cls = plugin;
+ api->send = NULL;
api->disconnect = &udp_disconnect;
api->address_pretty_printer = &udp_plugin_address_pretty_printer;
api->address_to_string = &udp_address_to_string;
+ api->string_to_address = &udp_string_to_address;
api->check_address = &udp_plugin_check_address;
+ api->get_session = &udp_plugin_get_session;
+ api->send = &udp_plugin_send;
- if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string(env->cfg,
- "transport-udp",
- "BINDTO",
- &plugin->bind_address))
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "Binding udp plugin to specific address: `%s'\n",
- plugin->bind_address);
- if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_string(env->cfg,
- "transport-udp",
- "BINDTO6",
- &plugin->bind6_address))
- GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
- "Binding udp plugin to specific address: `%s'\n",
- plugin->bind6_address);
-
- sockets_created = 0;
- if ( (GNUNET_YES !=
- GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg,
- "gnunetd",
- "DISABLEV6")))
- {
- plugin->udp_sockv6.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 0);
- if (NULL == plugin->udp_sockv6.desc)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
- }
- else
- {
- memset (&serverAddrv6, 0, sizeof (serverAddrv6));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- serverAddrv6.sin6_len = sizeof (serverAddrv6);
-#endif
-
- serverAddrv6.sin6_family = AF_INET6;
- serverAddrv6.sin6_addr = in6addr_any;
- if (plugin->bind6_address != NULL)
- {
- if (1 != inet_pton(AF_INET6, plugin->bind6_address, &serverAddrv6.sin6_addr))
- return 0;
- }
- serverAddrv6.sin6_port = htons (plugin->port);
- addrlen = sizeof (serverAddrv6);
- serverAddr = (struct sockaddr *) &serverAddrv6;
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Binding to IPv6 port %d\n",
- ntohs(serverAddrv6.sin6_port));
-#endif
- tries = 0;
- while (GNUNET_NETWORK_socket_bind (plugin->udp_sockv6.desc, serverAddr, addrlen) !=
- GNUNET_OK)
- {
- serverAddrv6.sin6_port
- = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "IPv6 Binding failed, trying new port %d\n",
- ntohs(serverAddrv6.sin6_port));
-#endif
- tries++;
- if (tries > 10)
- {
- GNUNET_NETWORK_socket_close (plugin->udp_sockv6.desc);
- plugin->udp_sockv6.desc = NULL;
- break;
- }
- }
- if (plugin->udp_sockv6.desc != NULL)
- {
- plugin->udp_sockv6.port = ntohs(serverAddrv6.sin6_port);
- addrs[sockets_created] = (struct sockaddr*) &serverAddrv6;
- addrlens[sockets_created] = sizeof (serverAddrv6);
- sockets_created++;
- }
- }
- }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
+ res = setup_sockets (plugin, &serverAddrv6, &serverAddrv4);
+ if ((res == 0) || ((plugin->sockv4 == NULL) && (plugin->sockv6 == NULL)))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+ }
- plugin->udp_sockv4.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 0);
- if (NULL == plugin->udp_sockv4.desc)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "socket");
- }
- else
- {
- memset (&serverAddrv4, 0, sizeof (serverAddrv4));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- serverAddrv4.sin_len = sizeof (serverAddrv4);
-#endif
- serverAddrv4.sin_family = AF_INET;
- serverAddrv4.sin_addr.s_addr = INADDR_ANY;
- if (plugin->bind_address != NULL)
- {
- if (1 != inet_pton(AF_INET, plugin->bind_address, &serverAddrv4.sin_addr))
- return 0;
- }
- serverAddrv4.sin_port = htons (plugin->port);
- addrlen = sizeof (serverAddrv4);
- serverAddr = (struct sockaddr *) &serverAddrv4;
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Binding to IPv4 port %d\n",
- ntohs(serverAddrv4.sin_port));
-#endif
- tries = 0;
- while (GNUNET_NETWORK_socket_bind (plugin->udp_sockv4.desc, serverAddr, addrlen) !=
- GNUNET_OK)
- {
- serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
-#if DEBUG_UDP
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "IPv4 Binding failed, trying new port %d\n",
- ntohs(serverAddrv4.sin_port));
-#endif
- tries++;
- if (tries > 10)
- {
- GNUNET_NETWORK_socket_close (plugin->udp_sockv4.desc);
- plugin->udp_sockv4.desc = NULL;
- break;
- }
- }
- if (plugin->udp_sockv4.desc != NULL)
- {
- plugin->udp_sockv4.port = ntohs(serverAddrv4.sin_port);
- addrs[sockets_created] = (struct sockaddr*) &serverAddrv4;
- addrlens[sockets_created] = sizeof (serverAddrv4);
- sockets_created++;
- }
- }
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
+ if (broadcast == GNUNET_YES)
+ setup_broadcast (plugin, &serverAddrv6, &serverAddrv4);
- plugin->rs = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_zero (plugin->rs);
- if (NULL != plugin->udp_sockv4.desc)
- GNUNET_NETWORK_fdset_set (plugin->rs,
- plugin->udp_sockv4.desc);
- if (NULL != plugin->udp_sockv6.desc)
- GNUNET_NETWORK_fdset_set (plugin->rs,
- plugin->udp_sockv6.desc);
- plugin->select_task =
- GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
- NULL, &udp_plugin_select, plugin);
- if (sockets_created == 0)
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Failed to open UDP sockets\n"));
- plugin->nat = GNUNET_NAT_register (env->cfg,
- GNUNET_NO,
- port,
- sockets_created,
- (const struct sockaddr**) addrs, addrlens,
- &udp_nat_port_map_callback,
- &udp_plugin_reversal_callback,
- plugin);
+ GNUNET_free_non_null (bind4_address);
+ GNUNET_free_non_null (bind6_address);
return api;
}
+static int
+heap_cleanup_iterator (void *cls,
+ struct GNUNET_CONTAINER_HeapNode *
+ node, void *element,
+ GNUNET_CONTAINER_HeapCostType
+ cost)
+{
+ struct DefragContext * d_ctx = element;
+
+ GNUNET_CONTAINER_heap_remove_node (node);
+ GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
+ GNUNET_free (d_ctx);
+
+ return GNUNET_YES;
+}
+
+
+/**
+ * The exported method. Makes the core api available via a global and
+ * returns the udp transport API.
+ *
+ * @param cls our 'struct GNUNET_TRANSPORT_PluginEnvironment'
+ * @return NULL
+ */
void *
libgnunet_plugin_transport_udp_done (void *cls)
{
struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
struct Plugin *plugin = api->cls;
+ if (NULL == plugin)
+ {
+ GNUNET_free (api);
+ return NULL;
+ }
+
+ stop_broadcast (plugin);
+
if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (plugin->select_task);
- plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (plugin->udp_sockv4.desc != NULL)
- {
- GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->udp_sockv4.desc));
- plugin->udp_sockv4.desc = NULL;
- }
- if (plugin->udp_sockv6.desc != NULL)
- {
- GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->udp_sockv6.desc));
- plugin->udp_sockv6.desc = NULL;
- }
- GNUNET_NETWORK_fdset_destroy (plugin->rs);
+ {
+ GNUNET_SCHEDULER_cancel (plugin->select_task);
+ plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+ if (plugin->select_task_v6 != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
+ plugin->select_task_v6 = GNUNET_SCHEDULER_NO_TASK;
+ }
+
+ /* Closing sockets */
+ if (plugin->sockv4 != NULL)
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv4));
+ plugin->sockv4 = NULL;
+ }
+ GNUNET_NETWORK_fdset_destroy (plugin->rs_v4);
+ GNUNET_NETWORK_fdset_destroy (plugin->ws_v4);
+
+ if (plugin->sockv6 != NULL)
+ {
+ GNUNET_break (GNUNET_OK == GNUNET_NETWORK_socket_close (plugin->sockv6));
+ plugin->sockv6 = NULL;
+
+ GNUNET_NETWORK_fdset_destroy (plugin->rs_v6);
+ GNUNET_NETWORK_fdset_destroy (plugin->ws_v6);
+ }
+
GNUNET_NAT_unregister (plugin->nat);
+
+ if (plugin->defrag_ctxs != NULL)
+ {
+ GNUNET_CONTAINER_heap_iterate(plugin->defrag_ctxs,
+ heap_cleanup_iterator, NULL);
+ GNUNET_CONTAINER_heap_destroy(plugin->defrag_ctxs);
+ plugin->defrag_ctxs = NULL;
+ }
+ if (plugin->mst != NULL)
+ {
+ GNUNET_SERVER_mst_destroy(plugin->mst);
+ plugin->mst = NULL;
+ }
+
+ /* Clean up leftover messages */
+ struct UDPMessageWrapper * udpw;
+ udpw = plugin->ipv4_queue_head;
+ while (udpw != NULL)
+ {
+ struct UDPMessageWrapper *tmp = udpw->next;
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
+ GNUNET_free (udpw);
+ udpw = tmp;
+ }
+ udpw = plugin->ipv6_queue_head;
+ while (udpw != NULL)
+ {
+ struct UDPMessageWrapper *tmp = udpw->next;
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
+ if (udpw->cont != NULL)
+ udpw->cont (udpw->cont_cls, &udpw->session->target, GNUNET_SYSERR);
+ GNUNET_free (udpw);
+ udpw = tmp;
+ }
+
+ /* Clean up sessions */
+#if DEBUG_UDP
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Cleaning up sessions\n");
+#endif
+ GNUNET_CONTAINER_multihashmap_iterate (plugin->sessions, &disconnect_and_free_it, plugin);
+ GNUNET_CONTAINER_multihashmap_destroy (plugin->sessions);
+
plugin->nat = NULL;
GNUNET_free (plugin);
GNUNET_free (api);
return NULL;
}
+
/* end of plugin_transport_udp.c */