/*
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
- by the Free Software Foundation; either version 2, or (at your
+ by the Free Software Foundation; either version 3, or (at your
option) any later version.
GNUnet is distributed in the hope that it will be useful, but
/**
* @file transport/plugin_transport_udp.c
- * @brief Implementation of the UDP transport service
+ * @brief Implementation of the UDP transport protocol
* @author Christian Grothoff
* @author Nathan Evans
+ * @author Matthias Wachs
*/
-
#include "platform.h"
+#include "plugin_transport_udp.h"
#include "gnunet_hello_lib.h"
-#include "gnunet_connection_lib.h"
-#include "gnunet_os_lib.h"
-#include "gnunet_peerinfo_service.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_fragmentation_lib.h"
+#include "gnunet_nat_lib.h"
#include "gnunet_protocols.h"
#include "gnunet_resolver_service.h"
-#include "gnunet_server_lib.h"
-#include "gnunet_service_lib.h"
#include "gnunet_signatures.h"
+#include "gnunet_constants.h"
#include "gnunet_statistics_service.h"
#include "gnunet_transport_service.h"
-#include "plugin_transport.h"
+#include "gnunet_transport_plugin.h"
#include "transport.h"
-#define DEBUG_UDP GNUNET_YES
+#define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
-/*
- * Transport cost to peer, always 1 for UDP (direct connection)
- */
-#define UDP_DIRECT_DISTANCE 1
/**
- * Handle for request of hostname resolution, non-NULL if pending.
+ * 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.
*/
-static struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
+#define UDP_MAX_MESSAGES_IN_DEFRAG 3
/**
- * How long until we give up on transmitting the welcome message?
+ * 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).
*/
-#define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+#define UDP_MAX_SENDER_ADDRESSES_WITH_DEFRAG 128
+
/**
- * Message-Packet header.
+ * Closure for 'append_port'.
*/
-struct UDPMessage
+struct PrettyPrinterContext
{
/**
- * size of the message, in bytes, including this header.
+ * Function to call with the result.
*/
- struct GNUNET_MessageHeader header;
+ GNUNET_TRANSPORT_AddressStringCallback asc;
/**
- * What is the identity of the sender (GNUNET_hash of public key)
+ * Clsoure for 'asc'.
*/
- struct GNUNET_PeerIdentity sender;
-
-};
-
-/* Forward definition */
-struct Plugin;
-
-struct PrettyPrinterContext
-{
- GNUNET_TRANSPORT_AddressStringCallback asc;
void *asc_cls;
+
+ /**
+ * Port to add after the IP address.
+ */
uint16_t port;
};
-/**
- * Encapsulation of all of the state of the plugin.
- */
-struct Plugin
+
+struct Session
{
/**
- * Our environment.
+ * Which peer is this session for?
*/
- struct GNUNET_TRANSPORT_PluginEnvironment *env;
+ struct GNUNET_PeerIdentity target;
+
+ struct FragmentationContext * frag_ctx;
/**
- * Handle for the statistics service.
+ * Address of the other peer
*/
- struct GNUNET_STATISTICS_Handle *statistics;
+ const struct sockaddr *sock_addr;
/**
- * Handle to the network service.
+ * Desired delay for next sending we send to other peer
*/
- struct GNUNET_SERVICE_Context *service;
+ struct GNUNET_TIME_Relative flow_delay_for_other_peer;
/**
- * Handle for request of hostname resolution, non-NULL if pending.
+ * Desired delay for next sending we received from other peer
*/
- struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
+ struct GNUNET_TIME_Absolute flow_delay_from_other_peer;
/**
- * ID of task used to update our addresses when one expires.
+ * Session timeout task
*/
- GNUNET_SCHEDULER_TaskIdentifier address_update_task;
+ GNUNET_SCHEDULER_TaskIdentifier timeout_task;
/**
- * ID of select task
+ * expected delay for ACKs
*/
- GNUNET_SCHEDULER_TaskIdentifier select_task;
+ struct GNUNET_TIME_Relative last_expected_delay;
+
+ struct GNUNET_ATS_Information ats;
+
+ size_t addrlen;
+
+
+ unsigned int rc;
+
+ int in_destroy;
+};
+
+
+struct SessionCompareContext
+{
+ struct Session *res;
+ const struct GNUNET_HELLO_Address *addr;
+};
+
+/**
+ * Closure for 'process_inbound_tokenized_messages'
+ */
+struct SourceInformation
+{
/**
- * Port that we are actually listening on.
+ * Sender identity.
*/
- uint16_t open_port;
+ struct GNUNET_PeerIdentity sender;
/**
- * Port that the user said we would have visible to the
- * rest of the world.
+ * Source address.
*/
- uint16_t adv_port;
+ const void *arg;
- /*
- * FD Read set
+ struct Session *session;
+ /**
+ * Number of bytes in source address.
*/
- struct GNUNET_NETWORK_FDSet *rs;
+ size_t args;
};
-/* *********** globals ************* */
-
-/**
- * the socket that we transmit all data with
- */
-static struct GNUNET_NETWORK_Handle *udp_sock;
/**
- * Disconnect from a remote node.
- *
- * @param tsession the session that is closed
- * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
+ * Closure for 'find_receive_context'.
*/
-void
-udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
+struct FindReceiveContext
{
- return;
-}
+ /**
+ * Where to store the result.
+ */
+ struct DefragContext *rc;
+
+ /**
+ * Address to find.
+ */
+ const struct sockaddr *addr;
+
+ struct Session *session;
+
+ /**
+ * Number of bytes in 'addr'.
+ */
+ socklen_t addr_len;
+
+};
-/**
- * Shutdown the server process (stop receiving inbound traffic). Maybe
- * restarted later!
- */
-static int
-udp_transport_server_stop (void *cls)
-{
- struct Plugin *plugin = cls;
- GNUNET_assert (udp_sock != NULL);
- if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
- {
- GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
- plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
- }
- GNUNET_NETWORK_socket_close (udp_sock);
- udp_sock = NULL;
- return GNUNET_OK;
-}
/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin.
- *
- * @param cls closure
- * @param target who should receive this message (ignored by UDP)
- * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
- * @param msgbufsize 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 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
- *
- * @return the number of bytes written
+ * Data structure to track defragmentation contexts based
+ * on the source of the UDP traffic.
*/
-
-static ssize_t
-udp_plugin_send (void *cls,
- const struct GNUNET_PeerIdentity *target,
- char *msgbuf,
- size_t msgbuf_size,
- unsigned int priority,
- struct GNUNET_TIME_Relative timeout,
- const void *addr,
- size_t addrlen,
- int force_address,
- GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+struct DefragContext
{
- struct Plugin *plugin = cls;
- struct UDPMessage *message;
- int ssize;
- ssize_t sent;
- GNUNET_assert(udp_sock != NULL);
+ /**
+ * Defragmentation context.
+ */
+ struct GNUNET_DEFRAGMENT_Context *defrag;
- if ((addr == NULL) || (addrlen == 0))
- {
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("udp_plugin_send called without address, returning!\n"));
-#endif
- cont (cont_cls, target, GNUNET_OK);
- return 0; /* Can never send if we don't have an address!! */
- }
+ /**
+ * Source address this receive context is for (allocated at the
+ * end of the struct).
+ */
+ const struct sockaddr *src_addr;
- /* Build the message to be sent */
- message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
- ssize = sizeof (struct UDPMessage) + msgbuf_size;
+ /**
+ * Reference to master plugin struct.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * Node in the defrag heap.
+ */
+ struct GNUNET_CONTAINER_HeapNode *hnode;
+
+ /**
+ * Length of 'src_addr'
+ */
+ size_t addr_len;
+};
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("In udp_send, ssize is %d, sending message to %s\n"), ssize, GNUNET_a2s((const struct sockaddr *)addr, addrlen));
-#endif
- 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);
-
- /* Actually send the message */
- sent =
- GNUNET_NETWORK_socket_sendto (udp_sock, message, ssize,
- addr,
- addrlen);
-
- if (cont != NULL)
- {
- if (sent == GNUNET_SYSERR)
- cont (cont_cls, target, GNUNET_SYSERR);
- else
- {
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("Sucessfully sent message, calling transmit continuation!\n"));
-#endif
- cont (cont_cls, target, GNUNET_OK);
- }
- }
- GNUNET_free (message);
- return sent;
-}
/**
- * Add the IP of our network interface to the list of
- * our external IP addresses.
+ * Closure for 'process_inbound_tokenized_messages'
*/
-static int
-process_interfaces (void *cls,
- const char *name,
- int isDefault,
- const struct sockaddr *addr, socklen_t addrlen)
+struct FragmentationContext
{
- struct Plugin *plugin = cls;
- int af;
- struct sockaddr_in *v4;
- struct sockaddr_in6 *v6;
+ struct FragmentationContext * next;
+ struct FragmentationContext * prev;
- af = addr->sa_family;
- if (af == AF_INET)
- {
- v4 = (struct sockaddr_in *) addr;
- v4->sin_port = htons (plugin->adv_port);
- }
- else
- {
- GNUNET_assert (af == AF_INET6);
- v6 = (struct sockaddr_in6 *) addr;
- v6->sin6_port = htons (plugin->adv_port);
- }
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
- GNUNET_ERROR_TYPE_BULK,
- "udp", _("Found address `%s' (%s)\n"),
- GNUNET_a2s (addr, addrlen), name);
- plugin->env->notify_address (plugin->env->cls,
- "udp",
- addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
+ struct Plugin * plugin;
+ struct GNUNET_FRAGMENT_Context * frag;
+ struct Session * session;
- return GNUNET_OK;
-}
+ /**
+ * Function to call upon completion of the transmission.
+ */
+ GNUNET_TRANSPORT_TransmitContinuation cont;
+ /**
+ * Closure for 'cont'.
+ */
+ void *cont_cls;
-/**
- * Function called by the resolver for each address obtained from DNS
- * for our own hostname. Add the addresses to the list of our
- * external IP addresses.
- *
- * @param cls closure
- * @param addr one of the addresses of the host, NULL for the last address
- * @param addrlen length of the address
- */
-static void
-process_hostname_ips (void *cls,
- const struct sockaddr *addr, socklen_t addrlen)
-{
- struct Plugin *plugin = cls;
+ struct GNUNET_TIME_Absolute timeout;
- if (addr == NULL)
- {
- plugin->hostname_dns = NULL;
- return;
- }
- process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
-}
+ size_t bytes_to_send;
+};
-/*
- * @param cls the plugin handle
- * @param tc the scheduling context (for rescheduling this function again)
- *
- * We have been notified that our writeset has something to read. Presumably
- * select has been called already, so we can go ahead and start reading from
- * the socket immediately. Then we check if there is more to be read by
- * calling select ourselves while there is stuff on the wire. Then reschedule
- * this function to be called again once more is available.
- *
- */
-static void
-udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+struct UDPMessageWrapper
{
- struct Plugin *plugin = cls;
- struct GNUNET_TIME_Relative timeout =
- GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500);
- char *buf;
- struct UDPMessage *msg;
- const struct GNUNET_MessageHeader *hdr;
- struct GNUNET_PeerIdentity *sender;
- unsigned int buflen;
- socklen_t fromlen;
- struct sockaddr_storage addr;
- ssize_t ret;
- int offset;
- int count;
- int tsize;
- char *msgbuf;
- const struct GNUNET_MessageHeader *currhdr;
-
- do
- {
- buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock);
+ struct Session *session;
+ struct UDPMessageWrapper *prev;
+ struct UDPMessageWrapper *next;
+ char *udp;
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("we expect to read %u bytes\n"), buflen);
-#endif
+ /**
+ * Function to call upon completion of the transmission.
+ */
+ GNUNET_TRANSPORT_TransmitContinuation cont;
- if (buflen == GNUNET_NO)
- return;
+ /**
+ * Closure for 'cont'.
+ */
+ void *cont_cls;
- buf = GNUNET_malloc (buflen);
- fromlen = sizeof (addr);
+ struct FragmentationContext *frag_ctx;
- memset (&addr, 0, fromlen);
- ret =
- GNUNET_NETWORK_socket_recvfrom (udp_sock, buf, buflen,
- (struct sockaddr *) &addr, &fromlen);
+ size_t msg_size;
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("socket_recv returned %u, src_addr_len is %u\n"), ret,
- fromlen);
-#endif
+ struct GNUNET_TIME_Absolute timeout;
+};
- if (ret <= 0)
- {
- GNUNET_free (buf);
- return;
- }
- msg = (struct UDPMessage *) buf;
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("header reports message size of %d\n"),
- ntohs (msg->header.size));
+/**
+ * UDP ACK Message-Packet header (after defragmentation).
+ */
+struct UDP_ACK_Message
+{
+ /**
+ * Message header.
+ */
+ struct GNUNET_MessageHeader header;
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("header reports message type of %d\n"),
- ntohs (msg->header.type));
-#endif
- if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
- {
- GNUNET_free (buf);
- GNUNET_NETWORK_fdset_zero (plugin->rs);
- GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock);
- break;
- }
- hdr = (const struct GNUNET_MessageHeader *) &msg[1];
- msgbuf = (char *)&msg[1];
- sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
- memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
-
- offset = 0;
- count = 0;
- tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
- while (offset < tsize)
- {
- currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("processing msg %d: type %d, size %d at offset %d\n"),
- count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
-#endif
- plugin->env->receive (plugin->env->cls,
- sender, currhdr, UDP_DIRECT_DISTANCE, (char *)&addr, fromlen);
- offset += ntohs(currhdr->size);
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("offset now %d, tsize %d\n"),
- offset, tsize);
-#endif
- count++;
- }
+ /**
+ * Desired delay for flow control
+ */
+ uint32_t delay;
- GNUNET_free (sender);
- GNUNET_free (buf);
+ /**
+ * What is the identity of the sender
+ */
+ struct GNUNET_PeerIdentity sender;
- }
- while (GNUNET_NETWORK_socket_select (plugin->rs,
- NULL,
- NULL,
- timeout) > 0
- && GNUNET_NETWORK_fdset_isset (plugin->rs, udp_sock));
+};
- plugin->select_task =
- GNUNET_SCHEDULER_add_select (plugin->env->sched,
- GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
- NULL, &udp_plugin_select, plugin);
+/**
+ * Encapsulation of all of the state of the plugin.
+ */
+struct Plugin * plugin;
-}
/**
- * Create a UDP socket. If possible, use IPv6, otherwise
- * try IPv4.
+ * 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 struct GNUNET_NETWORK_Handle *
-udp_transport_server_start (void *cls)
-{
- struct Plugin *plugin = cls;
- struct GNUNET_NETWORK_Handle *desc;
- struct sockaddr_in serverAddrv4;
- struct sockaddr_in6 serverAddrv6;
- struct sockaddr *serverAddr;
- socklen_t addrlen;
+static void
+udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
- desc = NULL;
- if (GNUNET_YES !=
- GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
- "DISABLE-IPV6"))
- {
- desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
- if (desc != NULL)
- {
- 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;
- serverAddrv6.sin6_port = htons (plugin->open_port);
- addrlen = sizeof (serverAddrv6);
- serverAddr = (struct sockaddr *) &serverAddrv6;
- }
- }
- if (NULL == desc)
- {
- desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
- if (NULL == desc)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
- return NULL;
- }
- 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;
- serverAddrv4.sin_port = htons (plugin->open_port);
- addrlen = sizeof (serverAddrv4);
- serverAddr = (struct sockaddr *) &serverAddrv4;
- }
- }
- if (desc != NULL)
- {
- GNUNET_assert (GNUNET_NETWORK_socket_bind (desc, serverAddr, addrlen) ==
- GNUNET_OK);
- }
+/**
+ * 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_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
- plugin->rs = GNUNET_NETWORK_fdset_create ();
- GNUNET_NETWORK_fdset_zero (plugin->rs);
- GNUNET_NETWORK_fdset_set (plugin->rs, desc);
+/**
+ * Start session timeout
+ */
+static void
+start_session_timeout (struct Session *s);
- plugin->select_task =
- GNUNET_SCHEDULER_add_select (plugin->env->sched,
- GNUNET_SCHEDULER_PRIORITY_DEFAULT,
- GNUNET_SCHEDULER_NO_TASK,
- GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
- NULL, &udp_plugin_select, plugin);
+/**
+ * Increment session timeout due to activity
+ */
+static void
+reschedule_session_timeout (struct Session *s);
+
+/**
+ * Cancel timeout
+ */
+static void
+stop_session_timeout (struct Session *s);
- return desc;
-}
/**
- * Check if the given port is plausible (must be either
- * our listen port or our advertised port). If it is
- * neither, we return one of these two ports at random.
+ * 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.
*
- * @return either in_port or a more plausible port
+ * @param cls closure
+ * @param addr binary address
+ * @param addrlen length of the address
+ * @return string representing the same address
*/
-static uint16_t
-check_port (struct Plugin *plugin, uint16_t in_port)
+const char *
+udp_address_to_string (void *cls, const void *addr, size_t addrlen)
{
- if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
- return in_port;
- return (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- 2) == 0)
- ? plugin->open_port : plugin->adv_port;
+ 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;
}
/**
- * Another peer has suggested an address for this peer and transport
- * plugin. Check that this could be a valid address. This function
- * is not expected to 'validate' the address in the sense of trying to
- * connect to it but simply to see if the binary format is technically
- * legal for establishing a connection.
- *
- * @param addr pointer to the address, may be modified (slightly)
- * @param addrlen length of addr
- * @return GNUNET_OK if this is a plausible address for this peer
- * and transport, GNUNET_SYSERR if not
+ * Function called to convert a string address to
+ * a binary address.
*
- * TODO: perhaps make everything work with sockaddr_storage, it may
- * be a cleaner way to handle addresses in UDP
+ * @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
*/
static int
-udp_check_address (void *cls, void *addr, size_t addrlen)
+udp_string_to_address (void *cls, const char *addr, uint16_t addrlen,
+ void **buf, size_t *added)
{
- struct Plugin *plugin = cls;
- char buf[sizeof (struct sockaddr_in6)];
-
- struct sockaddr_in *v4;
- struct sockaddr_in6 *v6;
-
- if ((addrlen != sizeof (struct sockaddr_in)) &&
- (addrlen != sizeof (struct sockaddr_in6)))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- memcpy (buf, addr, sizeof (struct sockaddr_in6));
- if (addrlen == sizeof (struct sockaddr_in))
+ struct sockaddr_storage socket_address;
+
+ if ((NULL == addr) || (0 == addrlen))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ if ('\0' != addr[addrlen - 1])
+ {
+ return GNUNET_SYSERR;
+ }
+
+ if (strlen (addr) != addrlen - 1)
+ {
+ return GNUNET_SYSERR;
+ }
+
+ if (GNUNET_OK != GNUNET_STRINGS_to_address_ip (addr, strlen (addr),
+ &socket_address))
+ {
+ return GNUNET_SYSERR;
+ }
+
+ switch (socket_address.ss_family)
+ {
+ case AF_INET:
{
- v4 = (struct sockaddr_in *) buf;
- v4->sin_port = htons (check_port (plugin, ntohs (v4->sin_port)));
+ 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);
+ return GNUNET_OK;
}
- else
+ case AF_INET6:
{
- v6 = (struct sockaddr_in6 *) buf;
- v6->sin6_port = htons (check_port (plugin, ntohs (v6->sin6_port)));
+ 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_OK;
}
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
- "tcp",
- "Informing transport service about my address `%s'.\n",
- GNUNET_a2s (addr, addrlen));
-#endif
- return GNUNET_OK;
- return GNUNET_OK;
+ default:
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
}
/**
* Append our port and forward the result.
+ *
+ * @param cls a 'struct PrettyPrinterContext'
+ * @param hostname result from DNS resolver
*/
static void
append_port (void *cls, const char *hostname)
char *ret;
if (hostname == NULL)
- {
- ppc->asc (ppc->asc_cls, NULL);
- GNUNET_free (ppc);
- return;
- }
+ {
+ 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);
* @param asc_cls closure for asc
*/
static void
-udp_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
+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 Plugin *plugin = cls;
- const struct sockaddr_in *v4;
- const struct sockaddr_in6 *v6;
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 sockaddr_in)) &&
- (addrlen != sizeof (struct sockaddr_in6)))
- {
- /* invalid address */
- GNUNET_break_op (0);
- asc (asc_cls, NULL);
- return;
- }
+ if (addrlen == sizeof (struct IPv6UdpAddress))
+ {
+ u6 = addr;
+ memset (&a6, 0, sizeof (a6));
+ a6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ a6.sin6_len = sizeof (a6);
+#endif
+ 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))
+ {
+ u4 = addr;
+ memset (&a4, 0, sizeof (a4));
+ a4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ a4.sin_len = sizeof (a4);
+#endif
+ 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 if (0 == addrlen)
+ {
+ asc (asc_cls, "<inbound connection>");
+ asc (asc_cls, NULL);
+ return;
+ }
+ else
+ {
+ /* 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;
- if (addrlen == sizeof (struct sockaddr_in))
+ ppc->port = port;
+ GNUNET_RESOLVER_hostname_get (sb, sbs, !numeric, timeout, &append_port, ppc);
+}
+
+
+static void
+call_continuation (struct UDPMessageWrapper *udpw, int result)
+{
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling continuation for %u byte message to `%s' with result %s\n",
+ udpw->msg_size, GNUNET_i2s (&udpw->session->target),
+ (GNUNET_OK == result) ? "OK" : "SYSERR");
+ if (NULL != udpw->cont)
+ {
+ udpw->cont (udpw->cont_cls, &udpw->session->target,result);
+ }
+
+}
+
+
+/**
+ * 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 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, 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
+ *
+ */
+static int
+udp_plugin_check_address (void *cls, const void *addr, size_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ struct IPv4UdpAddress *v4;
+ struct IPv6UdpAddress *v6;
+
+ 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;
+}
+
+
+/**
+ * Task to free resources associated with a session.
+ *
+ * @param s session to free
+ */
+static void
+free_session (struct Session *s)
+{
+ if (s->frag_ctx != NULL)
+ {
+ GNUNET_FRAGMENT_context_destroy(s->frag_ctx->frag);
+ GNUNET_free (s->frag_ctx);
+ s->frag_ctx = NULL;
+ }
+ GNUNET_free (s);
+}
+
+
+/**
+ * Functions with this signature are called whenever we need
+ * to close a session due to a disconnect or failure to
+ * establish a connection.
+ *
+ * @param s session to close down
+ */
+static void
+disconnect_session (struct Session *s)
+{
+ struct UDPMessageWrapper *udpw;
+ struct UDPMessageWrapper *next;
+
+ GNUNET_assert (GNUNET_YES != s->in_destroy);
+ 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));
+ stop_session_timeout (s);
+ next = plugin->ipv4_queue_head;
+ while (NULL != (udpw = next))
+ {
+ next = udpw->next;
+ if (udpw->session == s)
{
- v4 = (const struct sockaddr_in *) addr;
- ppc->port = ntohs (v4->sin_port);
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv4_queue_head, plugin->ipv4_queue_tail, udpw);
+ call_continuation(udpw, GNUNET_SYSERR);
+ GNUNET_free (udpw);
}
+ }
+ next = plugin->ipv6_queue_head;
+ while (NULL != (udpw = next))
+ {
+ next = udpw->next;
+ if (udpw->session == s)
+ {
+ GNUNET_CONTAINER_DLL_remove(plugin->ipv6_queue_head, plugin->ipv6_queue_tail, udpw);
+ call_continuation(udpw, GNUNET_SYSERR);
+ GNUNET_free (udpw);
+ }
+ udpw = next;
+ }
+ plugin->env->session_end (plugin->env->cls, &s->target, s);
+
+ if (NULL != s->frag_ctx)
+ {
+ if (NULL != s->frag_ctx->cont)
+ {
+ s->frag_ctx->cont (s->frag_ctx->cont_cls, &s->target, GNUNET_SYSERR);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling continuation for fragemented message to `%s' with result SYSERR\n",
+ GNUNET_i2s (&s->target));
+ }
+ }
+
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multihashmap_remove (plugin->sessions,
+ &s->target.hashPubKey,
+ s));
+ GNUNET_STATISTICS_set(plugin->env->stats,
+ "# UDP sessions active",
+ GNUNET_CONTAINER_multihashmap_size(plugin->sessions),
+ GNUNET_NO);
+ if (s->rc > 0)
+ s->in_destroy = GNUNET_YES;
else
+ free_session (s);
+}
+
+/**
+ * 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 struct GNUNET_HashCode * key, void *value)
+{
+ disconnect_session(value);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Disconnect from a remote node. Clean up session if we have one for this peer
+ *
+ * @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
+udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
+{
+ struct Plugin *plugin = cls;
+ GNUNET_assert (plugin != NULL);
+
+ GNUNET_assert (target != NULL);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Disconnecting from peer `%s'\n", GNUNET_i2s (target));
+ /* Clean up sessions */
+ GNUNET_CONTAINER_multihashmap_get_multiple (plugin->sessions, &target->hashPubKey, &disconnect_and_free_it, plugin);
+}
+
+
+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 Session *s;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ struct sockaddr_in *v4;
+ struct sockaddr_in6 *v6;
+ size_t len;
+
+ switch (addrlen)
+ {
+ case sizeof (struct IPv4UdpAddress):
+ if (NULL == plugin->sockv4)
{
- v6 = (const struct sockaddr_in6 *) addr;
- ppc->port = ntohs (v6->sin6_port);
+ return NULL;
+ }
+ 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->last_expected_delay = GNUNET_TIME_UNIT_SECONDS;
+ start_session_timeout(s);
+ return s;
+}
+
+static int
+session_cmp_it (void *cls,
+ const struct GNUNET_HashCode * key,
+ void *value)
+{
+ struct SessionCompareContext * cctx = cls;
+ const struct GNUNET_HELLO_Address *address = cctx->addr;
+ struct Session *s = value;
+
+ socklen_t s_addrlen = s->addrlen;
+
+ 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));
+ 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))
+ {
+ cctx->res = s;
+ return GNUNET_NO;
}
- GNUNET_RESOLVER_hostname_get (plugin->env->sched,
- plugin->env->cfg,
- addr,
- addrlen,
- !numeric, timeout, &append_port, ppc);
+ }
+ return GNUNET_YES;
+}
+
+
+/**
+ * Creates a new outbound session the transport service will use to send data to the
+ * peer
+ *
+ * @param cls the plugin
+ * @param address the address
+ * @return the session or NULL of max connections exceeded
+ */
+static struct Session *
+udp_plugin_get_session (void *cls,
+ const struct GNUNET_HELLO_Address *address)
+{
+ struct Session * s = NULL;
+ struct Plugin * plugin = cls;
+ struct IPv6UdpAddress * udp_a6;
+ struct IPv4UdpAddress * udp_a4;
+
+ GNUNET_assert (plugin != NULL);
+ GNUNET_assert (address != NULL);
+
+
+ if ((address->address == NULL) ||
+ ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
+ (address->address_length != sizeof (struct IPv6UdpAddress))))
+ {
+ GNUNET_break (0);
+ return 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 (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;
+ }
+
+ /* check if session already exists */
+ struct SessionCompareContext cctx;
+ cctx.addr = address;
+ cctx.res = NULL;
+ 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));
+ GNUNET_CONTAINER_multihashmap_get_multiple(plugin->sessions, &address->peer.hashPubKey, session_cmp_it, &cctx);
+ if (cctx.res != NULL)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Found existing session %p\n", cctx.res);
+ return cctx.res;
+ }
+
+ /* otherwise create new */
+ s = create_session (plugin,
+ &address->peer,
+ address->address,
+ address->address_length,
+ NULL, NULL);
+ 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));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multihashmap_put (plugin->sessions,
+ &s->target.hashPubKey,
+ s,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
+
+ GNUNET_STATISTICS_set(plugin->env->stats,
+ "# UDP sessions active",
+ GNUNET_CONTAINER_multihashmap_size(plugin->sessions),
+ GNUNET_NO);
+
+ return s;
+}
+
+
+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);
}
+
+/**
+ * Fragment message was transmitted via UDP, let fragmentation know
+ * to send the next fragment now.
+ *
+ * @param cls the 'struct UDPMessageWrapper' of the fragment
+ * @param target destination peer (ignored)
+ * @param result GNUNET_OK on success (ignored)
+ */
+static void
+send_next_fragment (void *cls,
+ const struct GNUNET_PeerIdentity *target,
+ int result)
+{
+ struct UDPMessageWrapper *udpw = cls;
+
+ GNUNET_FRAGMENT_context_transmission_done (udpw->frag_ctx->frag);
+}
+
+
/**
- * Set a quota for receiving data from the given peer; this is a
- * per-transport limit. This call has no meaning for UDP, as if
- * we don't receive data it still comes in. UDP has no friendliness
- * guarantees, and our buffers will fill at some level.
+ * 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 closure, the 'struct FragmentationContext'
+ * @param msg the message that was created
+ */
+static void
+enqueue_fragment (void *cls, const struct GNUNET_MessageHeader *msg)
+{
+ struct FragmentationContext *frag_ctx = cls;
+ struct Plugin *plugin = frag_ctx->plugin;
+ struct UDPMessageWrapper * udpw;
+ struct Session *s;
+ size_t msg_len = ntohs (msg->size);
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Enqueuing fragment with %u bytes %u\n", msg_len , sizeof (struct UDPMessageWrapper));
+ 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 = &send_next_fragment;
+ udpw->cont_cls = udpw;
+ 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)
+ {
+ 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_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v4,
+ plugin->ws_v4,
+ &udp_plugin_select, plugin);
+ plugin->with_v4_ws = GNUNET_YES;
+ }
+ }
+ else if (s->addrlen == sizeof (struct sockaddr_in6))
+ {
+ if (plugin->with_v6_ws == GNUNET_NO)
+ {
+ 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_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v6,
+ plugin->ws_v6,
+ &udp_plugin_select_v6, plugin);
+ plugin->with_v6_ws = GNUNET_YES;
+ }
+ }
+}
+
+
+/**
+ * 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 target the peer for whom the quota is given
- * @param quota_in quota for receiving/sending data in bytes per ms
+ * @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",
+ mlen,
+ 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;
+
+ reschedule_session_timeout(s);
+ 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)
+ {
+ 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_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v4,
+ plugin->ws_v4,
+ &udp_plugin_select, plugin);
+ plugin->with_v4_ws = GNUNET_YES;
+ }
+ }
+ else if (s->addrlen == sizeof (struct sockaddr_in6))
+ {
+ if (plugin->with_v6_ws == GNUNET_NO)
+ {
+ 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_TIME_UNIT_FOREVER_REL,
+ plugin->rs_v6,
+ plugin->ws_v6,
+ &udp_plugin_select_v6, plugin);
+ plugin->with_v6_ws = GNUNET_YES;
+ }
+ }
+
+ return mlen;
+}
+
+
+/**
+ * Our external IP address/port mapping has changed.
+ *
+ * @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 void
-udp_plugin_set_receive_quota (void *cls,
- const struct GNUNET_PeerIdentity *target,
- uint32_t quota_in)
+udp_nat_port_map_callback (void *cls, int add_remove,
+ const struct sockaddr *addr, socklen_t addrlen)
{
- return; /* Do nothing */
+ 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);
}
+
+
+/**
+ * Message tokenizer has broken up an incomming message. Pass it on
+ * to the service.
+ *
+ * @param cls the 'struct Plugin'
+ * @param client the 'struct SourceInformation'
+ * @param hdr the actual message
+ */
+static int
+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);
+ if (GNUNET_YES == si->session->in_destroy)
+ return GNUNET_OK;
+ /* 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,
+ si->session,
+ si->arg,
+ si->args);
+ si->session->flow_delay_for_other_peer = delay;
+ reschedule_session_timeout(si->session);
+ return GNUNET_OK;
+}
+
+
+/**
+ * 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;
+ 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;
+ }
+ 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));
+
+ 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;
+ s->rc++;
+ GNUNET_SERVER_mst_receive (plugin->mst, &si, (const char *) &msg[1],
+ ntohs (msg->header.size) -
+ sizeof (struct UDPMessage), GNUNET_YES, GNUNET_NO);
+ s->rc--;
+ if ( (0 == s->rc) && (GNUNET_YES == s->in_destroy))
+ free_session (s);
+}
+
+
+/**
+ * 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
+find_receive_context (void *cls, struct GNUNET_CONTAINER_HeapNode *node,
+ void *element, GNUNET_CONTAINER_HeapCostType cost)
+{
+ struct FindReceiveContext *frc = cls;
+ struct DefragContext *e = element;
+
+ 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;
+}
+
+
+/**
+ * Process a defragmented message.
+ *
+ * @param cls the 'struct ReceiveContext'
+ * @param msg the message
+ */
+static void
+fragment_msg_proc (void *cls, const struct GNUNET_MessageHeader *msg)
+{
+ struct DefragContext *rc = cls;
+
+ 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;
+
+ struct Session *res;
+
+ size_t addrlen;
+};
+
+
+static int
+lookup_session_by_addr_it (void *cls, const struct 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;
+}
+
+
+/**
+ * Transmit an acknowledgement.
+ *
+ * @param cls the 'struct ReceiveContext'
+ * @param id message ID (unused)
+ * @param msg ack to transmit
+ */
+static void
+ack_proc (void *cls, uint32_t id, const struct GNUNET_MessageHeader *msg)
+{
+ 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 (s->flow_delay_for_other_peer.rel_value <= UINT32_MAX)
+ delay = s->flow_delay_for_other_peer.rel_value;
+
+ 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);
+ udpw = GNUNET_malloc (sizeof (struct UDPMessageWrapper) + msize);
+ udpw->msg_size = msize;
+ udpw->session = s;
+ udpw->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
+ 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,
+ const 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);
+}
+
+
+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;
+ 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))
+ {
+ 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));
+ return;
+ }
+
+ 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));
+ s->last_expected_delay = GNUNET_FRAGMENT_context_destroy (s->frag_ctx->frag);
+
+ struct UDPMessageWrapper * udpw;
+ struct UDPMessageWrapper * tmp;
+ if (s->addrlen == sizeof (struct sockaddr_in6))
+ {
+ udpw = plugin->ipv6_queue_head;
+ while (NULL != udpw)
+ {
+ tmp = udpw->next;
+ 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 = tmp;
+ }
+ }
+ if (s->addrlen == sizeof (struct sockaddr_in))
+ {
+ udpw = plugin->ipv4_queue_head;
+ while (udpw!= NULL)
+ {
+ tmp = udpw->next;
+ 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 = tmp;
+ }
+ }
+
+ if (s->frag_ctx->cont != NULL)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Calling continuation for fragmented message to `%s' with result %s\n",
+ GNUNET_i2s (&s->target), "OK");
+ s->frag_ctx->cont (s->frag_ctx->cont_cls, &udp_ack->sender, GNUNET_OK);
+ }
+
+ GNUNET_free (s->frag_ctx);
+ s->frag_ctx = NULL;
+}
+
+
+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;
+
+ 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));
+ /* 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);
+ 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));
+ }
+ else
+ {
+ 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));
+ }
+
+ 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] GNUNET_ALIGN;
+ 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 MINGW
+ /* On SOCK_DGRAM UDP sockets recvfrom might fail with a
+ * WSAECONNRESET error to indicate that previous sendto() (???)
+ * on this socket has failed.
+ */
+ if ( (-1 == size) && (ECONNRESET == errno) )
+ return;
+#endif
+ if ( (-1 == size) || (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;
+ }
+}
+
+
+static 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 UDPMessageWrapper *udpw = NULL;
+ static int network_down_error;
+
+ 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)
+ {
+ /* Message timed out */
+ call_continuation(udpw, GNUNET_SYSERR);
+ if (udpw->frag_ctx != NULL)
+ {
+ 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);
+ udpw->session->last_expected_delay = GNUNET_FRAGMENT_context_destroy(udpw->frag_ctx->frag);
+ GNUNET_free (udpw->frag_ctx);
+ udpw->session->frag_ctx = NULL;
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Message for peer `%s' with size %u timed out\n",
+ GNUNET_i2s(&udpw->session->target), udpw->msg_size);
+ }
+
+ 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;
+ }
+ }
+ 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 */
+ 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 */
+ 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)
+ {
+ const struct GNUNET_ATS_Information type = plugin->env->get_address_type
+ (plugin->env->cls,sa, slen);
+
+ if (((GNUNET_ATS_NET_LAN == ntohl(type.value)) || (GNUNET_ATS_NET_WAN == ntohl(type.value))) &&
+ ((ENETUNREACH == errno) || (ENETDOWN == errno)))
+ {
+ if ((network_down_error == GNUNET_NO) && (slen == sizeof (struct sockaddr_in)))
+ {
+ /* IPv4: "Network unreachable" or "Network down"
+ *
+ * This indicates we do not have connectivity
+ */
+ LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
+ _("UDP could not transmit message to `%s': "
+ "Network seems down, please check your network configuration\n"),
+ GNUNET_a2s (sa, slen));
+ }
+ if ((network_down_error == GNUNET_NO) && (slen == sizeof (struct sockaddr_in6)))
+ {
+ /* IPv6: "Network unreachable" or "Network down"
+ *
+ * This indicates that this system is IPv6 enabled, but does not
+ * have a valid global IPv6 address assigned or we do not have
+ * connectivity
+ */
+
+ LOG (GNUNET_ERROR_TYPE_WARNING | GNUNET_ERROR_TYPE_BULK,
+ _("UDP could not transmit message to `%s': "
+ "Please check your network configuration and disable IPv6 if your "
+ "connection does not have a global IPv6 address\n"),
+ GNUNET_a2s (sa, slen));
+ }
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "UDP could not transmit %u-byte message to `%s': `%s'\n",
+ (unsigned int) (udpw->msg_size), GNUNET_a2s (sa, slen),
+ STRERROR (errno));
+ }
+ call_continuation(udpw, 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");
+ call_continuation(udpw, GNUNET_OK);
+ network_down_error = GNUNET_NO;
+ }
+
+ 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;
+}
+
+
+/**
+ * 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_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin *plugin = cls;
+
+ 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_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
+ plugin->with_v4_ws = GNUNET_NO;
+}
+
+
+/**
+ * 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_plugin_select_v6 (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin *plugin = cls;
+
+ 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_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)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING, "Disabling IPv6 since it is not supported on this system!\n");
+ plugin->enable_ipv6 = GNUNET_NO;
+ }
+ 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;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv6 port %d\n",
+ ntohs (serverAddrv6->sin6_port));
+ 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 */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv6 Binding failed, trying new port %d\n",
+ ntohs (serverAddrv6->sin6_port));
+ tries++;
+ if (tries > 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv6);
+ plugin->sockv6 = NULL;
+ break;
+ }
+ }
+ if (plugin->sockv6 != NULL)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv6 socket created on port %d\n",
+ ntohs (serverAddrv6->sin6_port));
+ 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;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Binding to IPv4 port %d\n",
+ ntohs (serverAddrv4->sin_port));
+ 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 */
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "IPv4 Binding failed, trying new port %d\n",
+ ntohs (serverAddrv4->sin_port));
+ 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)
+ LOG (GNUNET_ERROR_TYPE_WARNING, _("Failed to open UDP sockets\n"));
+
+ plugin->select_task =
+ GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
+ 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_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;
+}
+
+/**
+ * Session was idle, so disconnect it
+ */
+static void
+session_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ GNUNET_assert (NULL != cls);
+ struct Session *s = cls;
+
+ s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Session %p was idle for %llu ms, disconnecting\n",
+ s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
+ /* call session destroy function */
+ disconnect_session(s);
+}
+
+
+/**
+ * Start session timeout
+ */
+static void
+start_session_timeout (struct Session *s)
+{
+ GNUNET_assert (NULL != s);
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == s->timeout_task);
+ s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ &session_timeout,
+ s);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Timeout for session %p set to %llu ms\n",
+ s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
+}
+
+
+/**
+ * Increment session timeout due to activity
+ */
+static void
+reschedule_session_timeout (struct Session *s)
+{
+ GNUNET_assert (NULL != s);
+ GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != s->timeout_task);
+
+ GNUNET_SCHEDULER_cancel (s->timeout_task);
+ s->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT,
+ &session_timeout,
+ s);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Timeout rescheduled for session %p set to %llu ms\n",
+ s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
+}
+
+
+/**
+ * Cancel timeout
+ */
+static void
+stop_session_timeout (struct Session *s)
+{
+ GNUNET_assert (NULL != s);
+
+ if (GNUNET_SCHEDULER_NO_TASK != s->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (s->timeout_task);
+ s->timeout_task = GNUNET_SCHEDULER_NO_TASK;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Timeout stopped for session %p canceled\n",
+ s, (unsigned long long) GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.rel_value);
+ }
+}
+
+
+
/**
* 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)
{
- unsigned long long mtu;
-
struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
struct GNUNET_TRANSPORT_PluginFunctions *api;
- struct Plugin *plugin;
- struct GNUNET_SERVICE_Context *service;
+ struct Plugin *p;
+ unsigned long long port;
unsigned long long aport;
- unsigned long long bport;
-
- service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
- if (service == NULL)
+ unsigned long long broadcast;
+ unsigned long long udp_max_bps;
+ unsigned long long enable_v6;
+ char * bind4_address;
+ char * bind6_address;
+ char * fancy_interval;
+ struct GNUNET_TIME_Relative interval;
+ struct sockaddr_in serverAddrv4;
+ struct sockaddr_in6 serverAddrv6;
+ 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;
+ }
+
+ GNUNET_assert( NULL != env->stats);
+
+ /* 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",
+ "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_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
- ("Failed to start service for `%s' transport plugin.\n"),
- "udp");
+ GNUNET_free (bind4_address);
return NULL;
}
- aport = 0;
- if ((GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-udp",
- "PORT",
- &bport)) ||
- (bport > 65535) ||
- ((GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-udp",
- "ADVERTISED-PORT",
- &aport)) && (aport > 65535)))
+ }
+
+ 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_from (GNUNET_ERROR_TYPE_ERROR,
- "udp",
- _
- ("Require valid port number for service `%s' in configuration!\n"),
- "transport-udp");
- GNUNET_SERVICE_stop (service);
+ LOG (GNUNET_ERROR_TYPE_ERROR, _("Invalid IPv6 address: `%s'\n"),
+ bind6_address);
+ GNUNET_free_non_null (bind4_address);
+ GNUNET_free (bind6_address);
return NULL;
}
- if (aport == 0)
- aport = bport;
-
- mtu = 1240;
- if (mtu < 1200)
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
- "udp",
- _("MTU %llu for `%s' is probably too low!\n"), mtu,
- "UDP");
-
- plugin = GNUNET_malloc (sizeof (struct Plugin));
- plugin->open_port = bport;
- plugin->adv_port = aport;
- plugin->env = env;
- plugin->statistics = 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_string (env->cfg, "transport-udp",
+ "BROADCAST_INTERVAL", &fancy_interval))
+ {
+ interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 10);
+ }
+ else
+ {
+ if (GNUNET_SYSERR == GNUNET_STRINGS_fancy_time_to_relative(fancy_interval, &interval))
+ {
+ interval = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30);
+ }
+ GNUNET_free (fancy_interval);
+ }
+
+ /* 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 */
+ }
+
+ p = GNUNET_malloc (sizeof (struct Plugin));
api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
- api->cls = plugin;
- api->send = &udp_plugin_send;
+ GNUNET_BANDWIDTH_tracker_init (&p->tracker,
+ GNUNET_BANDWIDTH_value_init ((uint32_t)udp_max_bps), 30);
+ p->sessions = GNUNET_CONTAINER_multihashmap_create (10);
+ p->defrag_ctxs = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
+ p->mst = GNUNET_SERVER_mst_create (&process_inbound_tokenized_messages, p);
+ p->port = port;
+ p->aport = aport;
+ p->broadcast_interval = interval;
+ p->enable_ipv6 = enable_v6;
+ p->env = env;
+
+ plugin = p;
+
+ api->cls = p;
+ api->send = NULL;
api->disconnect = &udp_disconnect;
api->address_pretty_printer = &udp_plugin_address_pretty_printer;
- api->set_receive_quota = &udp_plugin_set_receive_quota;
- api->check_address = &udp_check_address;
+ 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;
- plugin->service = service;
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Setting up sockets\n");
+ res = setup_sockets (p, &serverAddrv6, &serverAddrv4);
+ if ((res == 0) || ((p->sockv4 == NULL) && (p->sockv6 == NULL)))
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR, "Failed to create network sockets, plugin failed\n");
+ GNUNET_free (p);
+ GNUNET_free (api);
+ return NULL;
+ }
+
+ if (broadcast == GNUNET_YES)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting broadcasting\n");
+ setup_broadcast (p, &serverAddrv6, &serverAddrv4);
+ }
+
+ GNUNET_free_non_null (bind4_address);
+ GNUNET_free_non_null (bind6_address);
+ return api;
+}
- /* FIXME: do the two calls below periodically again and
- not just once (since the info we get might change...) */
- GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
- plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
- env->cfg,
- AF_UNSPEC,
- HOSTNAME_RESOLVE_TIMEOUT,
- &process_hostname_ips,
- plugin);
- udp_sock = udp_transport_server_start (plugin);
+static int
+heap_cleanup_iterator (void *cls,
+ struct GNUNET_CONTAINER_HeapNode *
+ node, void *element,
+ GNUNET_CONTAINER_HeapCostType
+ cost)
+{
+ struct DefragContext * d_ctx = element;
- GNUNET_assert (udp_sock != NULL);
+ GNUNET_CONTAINER_heap_remove_node (node);
+ GNUNET_DEFRAGMENT_context_destroy(d_ctx->defrag);
+ GNUNET_free (d_ctx);
- return api;
+ 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;
- udp_transport_server_stop (plugin);
- if (NULL != hostname_dns)
- {
- GNUNET_RESOLVER_request_cancel (hostname_dns);
- hostname_dns = NULL;
- }
- GNUNET_SERVICE_stop (plugin->service);
+ if (NULL == plugin)
+ {
+ GNUNET_free (api);
+ return NULL;
+ }
- GNUNET_NETWORK_fdset_destroy (plugin->rs);
+ 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->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);
+ call_continuation(udpw, 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);
+ call_continuation(udpw, GNUNET_SYSERR);
+ GNUNET_free (udpw);
+ udpw = tmp;
+ }
+
+ /* Clean up sessions */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Cleaning up sessions\n");
+ 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 */
projects / oweals / gnunet.git / blobdiff