--- /dev/null
+/*
+ This file is part of GNUnet
+ Copyright (C) 2010-2017 GNUnet e.V.
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+ */
+
+/**
+ * @file transport/plugin_transport_xu.c
+ * @brief Implementation of the XU transport protocol
+ * @author Christian Grothoff
+ * @author Nathan Evans
+ * @author Matthias Wachs
+ */
+#include "platform.h"
+#include "plugin_transport_xu.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_fragmentation_lib.h"
+#include "gnunet_nat_service.h"
+#include "gnunet_protocols.h"
+#include "gnunet_resolver_service.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 LOG(kind,...) GNUNET_log_from (kind, "transport-xu", __VA_ARGS__)
+
+/**
+ * After how much inactivity should a XU session time out?
+ */
+#define XU_SESSION_TIME_OUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 60)
+
+
+/**
+ * XU Message-Packet header (after defragmentation).
+ */
+struct XUMessage
+{
+ /**
+ * Message header.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * Always zero for now.
+ */
+ uint32_t reserved;
+
+ /**
+ * What is the identity of the sender
+ */
+ struct GNUNET_PeerIdentity sender;
+
+};
+
+
+/**
+ * Closure for #append_port().
+ */
+struct PrettyPrinterContext
+{
+ /**
+ * DLL
+ */
+ struct PrettyPrinterContext *next;
+
+ /**
+ * DLL
+ */
+ struct PrettyPrinterContext *prev;
+
+ /**
+ * Our plugin.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * Resolver handle
+ */
+ struct GNUNET_RESOLVER_RequestHandle *resolver_handle;
+
+ /**
+ * Function to call with the result.
+ */
+ GNUNET_TRANSPORT_AddressStringCallback asc;
+
+ /**
+ * Clsoure for @e asc.
+ */
+ void *asc_cls;
+
+ /**
+ * Timeout task
+ */
+ struct GNUNET_SCHEDULER_Task *timeout_task;
+
+ /**
+ * Is this an IPv6 address?
+ */
+ int ipv6;
+
+ /**
+ * Options
+ */
+ uint32_t options;
+
+ /**
+ * Port to add after the IP address.
+ */
+ uint16_t port;
+
+};
+
+
+/**
+ * Session with another peer.
+ */
+struct GNUNET_ATS_Session
+{
+ /**
+ * Which peer is this session for?
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Tokenizer for inbound messages.
+ */
+ struct GNUNET_MessageStreamTokenizer *mst;
+
+ /**
+ * Plugin this session belongs to.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * Session timeout task
+ */
+ struct GNUNET_SCHEDULER_Task *timeout_task;
+
+ /**
+ * When does this session time out?
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * What time did we last transmit?
+ */
+ struct GNUNET_TIME_Absolute last_transmit_time;
+
+ /**
+ * expected delay for ACKs
+ */
+ struct GNUNET_TIME_Relative last_expected_ack_delay;
+
+ /**
+ * desired delay between XU messages
+ */
+ struct GNUNET_TIME_Relative last_expected_msg_delay;
+
+ /**
+ */
+ struct GNUNET_TIME_Relative flow_delay_for_other_peer;
+ struct GNUNET_TIME_Relative flow_delay_from_other_peer;
+
+ /**
+ * Our own address.
+ */
+ struct GNUNET_HELLO_Address *address;
+
+ /**
+ * Number of bytes waiting for transmission to this peer.
+ */
+ unsigned long long bytes_in_queue;
+
+ /**
+ * Number of messages waiting for transmission to this peer.
+ */
+ unsigned int msgs_in_queue;
+
+ /**
+ * Reference counter to indicate that this session is
+ * currently being used and must not be destroyed;
+ * setting @e in_destroy will destroy it as soon as
+ * possible.
+ */
+ unsigned int rc;
+
+ /**
+ * Network type of the address.
+ */
+ enum GNUNET_ATS_Network_Type scope;
+
+ /**
+ * Is this session about to be destroyed (sometimes we cannot
+ * destroy a session immediately as below us on the stack
+ * there might be code that still uses it; in this case,
+ * @e rc is non-zero).
+ */
+ int in_destroy;
+};
+
+
+
+/**
+ * If a session monitor is attached, notify it about the new
+ * session state.
+ *
+ * @param plugin our plugin
+ * @param session session that changed state
+ * @param state new state of the session
+ */
+static void
+notify_session_monitor (struct Plugin *plugin,
+ struct GNUNET_ATS_Session *session,
+ enum GNUNET_TRANSPORT_SessionState state)
+{
+ struct GNUNET_TRANSPORT_SessionInfo info;
+
+ if (NULL == plugin->sic)
+ return;
+ if (GNUNET_YES == session->in_destroy)
+ return; /* already destroyed, just RC>0 left-over actions */
+ memset (&info,
+ 0,
+ sizeof (info));
+ info.state = state;
+ info.is_inbound = GNUNET_SYSERR; /* hard to say */
+ info.num_msg_pending = session->msgs_in_queue;
+ info.num_bytes_pending = session->bytes_in_queue;
+ /* info.receive_delay remains zero as this is not supported by XU
+ (cannot selectively not receive from 'some' peer while continuing
+ to receive from others) */
+ info.session_timeout = session->timeout;
+ info.address = session->address;
+ plugin->sic (plugin->sic_cls,
+ session,
+ &info);
+}
+
+
+/**
+ * Return information about the given session to the monitor callback.
+ *
+ * @param cls the `struct Plugin` with the monitor callback (`sic`)
+ * @param peer peer we send information about
+ * @param value our `struct GNUNET_ATS_Session` to send information about
+ * @return #GNUNET_OK (continue to iterate)
+ */
+static int
+send_session_info_iter (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ void *value)
+{
+ struct Plugin *plugin = cls;
+ struct GNUNET_ATS_Session *session = value;
+
+ (void) peer;
+ notify_session_monitor (plugin,
+ session,
+ GNUNET_TRANSPORT_SS_INIT);
+ notify_session_monitor (plugin,
+ session,
+ GNUNET_TRANSPORT_SS_UP);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Begin monitoring sessions of a plugin. There can only
+ * be one active monitor per plugin (i.e. if there are
+ * multiple monitors, the transport service needs to
+ * multiplex the generated events over all of them).
+ *
+ * @param cls closure of the plugin
+ * @param sic callback to invoke, NULL to disable monitor;
+ * plugin will being by iterating over all active
+ * sessions immediately and then enter monitor mode
+ * @param sic_cls closure for @a sic
+ */
+static void
+xu_plugin_setup_monitor (void *cls,
+ GNUNET_TRANSPORT_SessionInfoCallback sic,
+ void *sic_cls)
+{
+ struct Plugin *plugin = cls;
+
+ plugin->sic = sic;
+ plugin->sic_cls = sic_cls;
+ if (NULL != sic)
+ {
+ GNUNET_CONTAINER_multipeermap_iterate (plugin->sessions,
+ &send_session_info_iter,
+ plugin);
+ /* signal end of first iteration */
+ sic (sic_cls,
+ NULL,
+ NULL);
+ }
+}
+
+
+/* ****************** Little Helpers ****************** */
+
+
+/**
+ * Function to free last resources associated with a session.
+ *
+ * @param s session to free
+ */
+static void
+free_session (struct GNUNET_ATS_Session *s)
+{
+ if (NULL != s->address)
+ {
+ GNUNET_HELLO_address_free (s->address);
+ s->address = NULL;
+ }
+ if (NULL != s->mst)
+ {
+ GNUNET_MST_destroy (s->mst);
+ s->mst = NULL;
+ }
+ GNUNET_free (s);
+}
+
+
+/**
+ * Function that is called to get the keepalive factor.
+ * #GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT is divided by this number to
+ * calculate the interval between keepalive packets.
+ *
+ * @param cls closure with the `struct Plugin`
+ * @return keepalive factor
+ */
+static unsigned int
+xu_query_keepalive_factor (void *cls)
+{
+ (void) cls;
+ return 15;
+}
+
+
+/**
+ * Function obtain the network type for a session
+ *
+ * @param cls closure (`struct Plugin *`)
+ * @param session the session
+ * @return the network type
+ */
+static enum GNUNET_ATS_Network_Type
+xu_plugin_get_network (void *cls,
+ struct GNUNET_ATS_Session *session)
+{
+ (void) cls;
+ return session->scope;
+}
+
+
+/**
+ * Function obtain the network type for an address.
+ *
+ * @param cls closure (`struct Plugin *`)
+ * @param address the address
+ * @return the network type
+ */
+static enum GNUNET_ATS_Network_Type
+xu_plugin_get_network_for_address (void *cls,
+ const struct GNUNET_HELLO_Address *address)
+{
+ struct Plugin *plugin = cls;
+ size_t addrlen;
+ struct sockaddr_in a4;
+ struct sockaddr_in6 a6;
+ const struct IPv4XuAddress *u4;
+ const struct IPv6XuAddress *u6;
+ const void *sb;
+ size_t sbs;
+
+ addrlen = address->address_length;
+ if (addrlen == sizeof(struct IPv6XuAddress))
+ {
+ GNUNET_assert (NULL != address->address); /* make static analysis happy */
+ u6 = address->address;
+ memset (&a6, 0, sizeof(a6));
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ a6.sin6_len = sizeof (a6);
+#endif
+ a6.sin6_family = AF_INET6;
+ a6.sin6_port = u6->u6_port;
+ GNUNET_memcpy (&a6.sin6_addr, &u6->ipv6_addr, sizeof(struct in6_addr));
+ sb = &a6;
+ sbs = sizeof(a6);
+ }
+ else if (addrlen == sizeof(struct IPv4XuAddress))
+ {
+ GNUNET_assert (NULL != address->address); /* make static analysis happy */
+ u4 = address->address;
+ memset (&a4, 0, sizeof(a4));
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ a4.sin_len = sizeof (a4);
+#endif
+ a4.sin_family = AF_INET;
+ a4.sin_port = u4->u4_port;
+ a4.sin_addr.s_addr = u4->ipv4_addr;
+ sb = &a4;
+ sbs = sizeof(a4);
+ }
+ else
+ {
+ GNUNET_break (0);
+ return GNUNET_ATS_NET_UNSPECIFIED;
+ }
+ return plugin->env->get_address_type (plugin->env->cls,
+ sb,
+ sbs);
+}
+
+
+/* ******************* Event loop ******************** */
+
+/**
+ * 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
+ */
+static void
+xu_plugin_select_v4 (void *cls);
+
+
+/**
+ * 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
+ */
+static void
+xu_plugin_select_v6 (void *cls);
+
+
+/**
+ * (re)schedule IPv4-select tasks for this plugin.
+ *
+ * @param plugin plugin to reschedule
+ */
+static void
+schedule_select_v4 (struct Plugin *plugin)
+{
+ if ( (GNUNET_YES != plugin->enable_ipv4) ||
+ (NULL == plugin->sockv4) )
+ return;
+ if (NULL != plugin->select_task_v4)
+ GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
+ plugin->select_task_v4
+ = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->sockv4,
+ &xu_plugin_select_v4,
+ plugin);
+}
+
+
+/**
+ * (re)schedule IPv6-select tasks for this plugin.
+ *
+ * @param plugin plugin to reschedule
+ */
+static void
+schedule_select_v6 (struct Plugin *plugin)
+{
+ if ( (GNUNET_YES != plugin->enable_ipv6) ||
+ (NULL == plugin->sockv6) )
+ return;
+ if (NULL != plugin->select_task_v6)
+ GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
+ plugin->select_task_v6
+ = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->sockv6,
+ &xu_plugin_select_v6,
+ plugin);
+}
+
+
+/* ******************* Address to string and back ***************** */
+
+
+/**
+ * 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 (a `union XuAddress`)
+ * @param addrlen length of the @a addr
+ * @return string representing the same address
+ */
+const char *
+xu_address_to_string (void *cls,
+ const void *addr,
+ size_t addrlen)
+{
+ static char rbuf[INET6_ADDRSTRLEN + 10];
+ char buf[INET6_ADDRSTRLEN];
+ const void *sb;
+ struct in_addr a4;
+ struct in6_addr a6;
+ const struct IPv4XuAddress *t4;
+ const struct IPv6XuAddress *t6;
+ int af;
+ uint16_t port;
+ uint32_t options;
+
+ (void) cls;
+ if (NULL == addr)
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+
+ if (addrlen == sizeof(struct IPv6XuAddress))
+ {
+ t6 = addr;
+ af = AF_INET6;
+ options = ntohl (t6->options);
+ port = ntohs (t6->u6_port);
+ a6 = t6->ipv6_addr;
+ sb = &a6;
+ }
+ else if (addrlen == sizeof(struct IPv4XuAddress))
+ {
+ t4 = addr;
+ af = AF_INET;
+ options = ntohl (t4->options);
+ port = ntohs (t4->u4_port);
+ a4.s_addr = t4->ipv4_addr;
+ 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"
+ : "%s.%u.%s:%u",
+ PLUGIN_NAME,
+ options,
+ buf,
+ port);
+ return rbuf;
+}
+
+
+/**
+ * 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
+ */
+static int
+xu_string_to_address (void *cls,
+ const char *addr,
+ uint16_t addrlen,
+ void **buf,
+ size_t *added)
+{
+ struct sockaddr_storage socket_address;
+ char *address;
+ char *plugin;
+ char *optionstr;
+ uint32_t options;
+
+ (void) cls;
+ /* Format tcp.options.address:port */
+ address = NULL;
+ plugin = NULL;
+ optionstr = NULL;
+
+ if ((NULL == addr) || (0 == addrlen))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if ('\0' != addr[addrlen - 1])
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if (strlen (addr) + 1 != (size_t) addrlen)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ plugin = GNUNET_strdup (addr);
+ optionstr = strchr (plugin, '.');
+ if (NULL == optionstr)
+ {
+ GNUNET_break (0);
+ GNUNET_free (plugin);
+ return GNUNET_SYSERR;
+ }
+ optionstr[0] = '\0';
+ optionstr++;
+ options = atol (optionstr);
+ address = strchr (optionstr, '.');
+ if (NULL == address)
+ {
+ GNUNET_break (0);
+ GNUNET_free (plugin);
+ return GNUNET_SYSERR;
+ }
+ address[0] = '\0';
+ address++;
+
+ if (GNUNET_OK !=
+ GNUNET_STRINGS_to_address_ip (address,
+ strlen (address),
+ &socket_address))
+ {
+ GNUNET_break (0);
+ GNUNET_free (plugin);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_free(plugin);
+
+ switch (socket_address.ss_family)
+ {
+ case AF_INET:
+ {
+ struct IPv4XuAddress *u4;
+ const struct sockaddr_in *in4 = (const struct sockaddr_in *) &socket_address;
+
+ u4 = GNUNET_new (struct IPv4XuAddress);
+ u4->options = htonl (options);
+ u4->ipv4_addr = in4->sin_addr.s_addr;
+ u4->u4_port = in4->sin_port;
+ *buf = u4;
+ *added = sizeof (struct IPv4XuAddress);
+ return GNUNET_OK;
+ }
+ case AF_INET6:
+ {
+ struct IPv6XuAddress *u6;
+ const struct sockaddr_in6 *in6 = (const struct sockaddr_in6 *) &socket_address;
+
+ u6 = GNUNET_new (struct IPv6XuAddress);
+ u6->options = htonl (options);
+ u6->ipv6_addr = in6->sin6_addr;
+ u6->u6_port = in6->sin6_port;
+ *buf = u6;
+ *added = sizeof (struct IPv6XuAddress);
+ 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)
+{
+ struct PrettyPrinterContext *ppc = cls;
+ struct Plugin *plugin = ppc->plugin;
+ char *ret;
+
+ if (NULL == hostname)
+ {
+ /* Final call, done */
+ GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
+ plugin->ppc_dll_tail,
+ ppc);
+ ppc->resolver_handle = NULL;
+ ppc->asc (ppc->asc_cls,
+ NULL,
+ GNUNET_OK);
+ GNUNET_free (ppc);
+ return;
+ }
+ if (GNUNET_YES == ppc->ipv6)
+ GNUNET_asprintf (&ret,
+ "%s.%u.[%s]:%d",
+ PLUGIN_NAME,
+ ppc->options,
+ hostname,
+ ppc->port);
+ else
+ GNUNET_asprintf (&ret,
+ "%s.%u.%s:%d",
+ PLUGIN_NAME,
+ ppc->options,
+ hostname,
+ ppc->port);
+ ppc->asc (ppc->asc_cls,
+ ret,
+ GNUNET_OK);
+ GNUNET_free (ret);
+}
+
+
+/**
+ * Convert the transports address to a nice, human-readable format.
+ *
+ * @param cls closure with the `struct Plugin *`
+ * @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;
+ * a `union XuAddress`
+ * @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 @a asc
+ */
+static void
+xu_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;
+ struct PrettyPrinterContext *ppc;
+ const struct sockaddr *sb;
+ size_t sbs;
+ struct sockaddr_in a4;
+ struct sockaddr_in6 a6;
+ const struct IPv4XuAddress *u4;
+ const struct IPv6XuAddress *u6;
+ uint16_t port;
+ uint32_t options;
+
+ (void) type;
+ if (addrlen == sizeof(struct IPv6XuAddress))
+ {
+ 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;
+ a6.sin6_addr = u6->ipv6_addr;
+ port = ntohs (u6->u6_port);
+ options = ntohl (u6->options);
+ sb = (const struct sockaddr *) &a6;
+ sbs = sizeof (a6);
+ }
+ else if (addrlen == sizeof (struct IPv4XuAddress))
+ {
+ 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);
+ options = ntohl (u4->options);
+ sb = (const struct sockaddr *) &a4;
+ sbs = sizeof(a4);
+ }
+ else
+ {
+ /* invalid address */
+ GNUNET_break_op (0);
+ asc (asc_cls,
+ NULL,
+ GNUNET_SYSERR);
+ asc (asc_cls,
+ NULL,
+ GNUNET_OK);
+ return;
+ }
+ ppc = GNUNET_new (struct PrettyPrinterContext);
+ ppc->plugin = plugin;
+ ppc->asc = asc;
+ ppc->asc_cls = asc_cls;
+ ppc->port = port;
+ ppc->options = options;
+ if (addrlen == sizeof (struct IPv6XuAddress))
+ ppc->ipv6 = GNUNET_YES;
+ else
+ ppc->ipv6 = GNUNET_NO;
+ GNUNET_CONTAINER_DLL_insert (plugin->ppc_dll_head,
+ plugin->ppc_dll_tail,
+ ppc);
+ ppc->resolver_handle
+ = GNUNET_RESOLVER_hostname_get (sb,
+ sbs,
+ ! numeric,
+ timeout,
+ &append_port,
+ ppc);
+}
+
+
+/**
+ * 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 our open or advertised port
+ */
+static int
+check_port (const struct Plugin *plugin,
+ uint16_t in_port)
+{
+ if ( (plugin->port == in_port) ||
+ (plugin->aport == in_port) )
+ 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 a `union XuAddress`
+ * @param addrlen length of @a addr
+ * @return #GNUNET_OK if this is a plausible address for this peer
+ * and transport, #GNUNET_SYSERR if not
+ */
+static int
+xu_plugin_check_address (void *cls,
+ const void *addr,
+ size_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ const struct IPv4XuAddress *v4;
+ const struct IPv6XuAddress *v6;
+
+ if (sizeof(struct IPv4XuAddress) == addrlen)
+ {
+ struct sockaddr_in s4;
+
+ v4 = (const struct IPv4XuAddress *) addr;
+ if (GNUNET_OK != check_port (plugin,
+ ntohs (v4->u4_port)))
+ return GNUNET_SYSERR;
+ memset (&s4, 0, sizeof (s4));
+ s4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ s4.sin_len = sizeof (s4);
+#endif
+ s4.sin_port = v4->u4_port;
+ s4.sin_addr.s_addr = v4->ipv4_addr;
+
+ if (GNUNET_OK !=
+ GNUNET_NAT_test_address (plugin->nat,
+ &s4,
+ sizeof (struct sockaddr_in)))
+ return GNUNET_SYSERR;
+ }
+ else if (sizeof(struct IPv6XuAddress) == addrlen)
+ {
+ struct sockaddr_in6 s6;
+
+ v6 = (const struct IPv6XuAddress *) addr;
+ if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
+ return GNUNET_OK; /* plausible, if unlikely... */
+ memset (&s6, 0, sizeof (s6));
+ s6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ s6.sin6_len = sizeof (s6);
+#endif
+ s6.sin6_port = v6->u6_port;
+ s6.sin6_addr = v6->ipv6_addr;
+
+ if (GNUNET_OK !=
+ GNUNET_NAT_test_address (plugin->nat,
+ &s6,
+ sizeof(struct sockaddr_in6)))
+ return GNUNET_SYSERR;
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ return GNUNET_SYSERR;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Our external IP address/port mapping has changed.
+ *
+ * @param cls closure, the `struct Plugin`
+ * @param add_remove #GNUNET_YES to mean the new public IP address,
+ * #GNUNET_NO to mean the previous (now invalid) one
+ * @param ac address class the address belongs to
+ * @param addr either the previous or the new public IP address
+ * @param addrlen actual length of the @a addr
+ */
+static void
+xu_nat_port_map_callback (void *cls,
+ int add_remove,
+ enum GNUNET_NAT_AddressClass ac,
+ const struct sockaddr *addr,
+ socklen_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ struct GNUNET_HELLO_Address *address;
+ struct IPv4XuAddress u4;
+ struct IPv6XuAddress u6;
+ void *arg;
+ size_t args;
+
+ if (GNUNET_NAT_AC_LOOPBACK == ac)
+ return;
+ if (GNUNET_NAT_AC_LAN == ac)
+ return;
+ if (GNUNET_NAT_AC_LAN_PRIVATE == ac)
+ return;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ (GNUNET_YES == add_remove)
+ ? "NAT notification to add address `%s'\n"
+ : "NAT notification to remove address `%s'\n",
+ GNUNET_a2s (addr,
+ addrlen));
+ /* convert 'address' to our internal format */
+ switch (addr->sa_family)
+ {
+ case AF_INET:
+ {
+ const struct sockaddr_in *i4;
+
+ GNUNET_assert (sizeof(struct sockaddr_in) == addrlen);
+ i4 = (const struct sockaddr_in *) addr;
+ if (0 == ntohs (i4->sin_port))
+ return; /* Port = 0 means unmapped, ignore these for XU. */
+ memset (&u4,
+ 0,
+ sizeof(u4));
+ u4.options = htonl (plugin->myoptions);
+ u4.ipv4_addr = i4->sin_addr.s_addr;
+ u4.u4_port = i4->sin_port;
+ arg = &u4;
+ args = sizeof (struct IPv4XuAddress);
+ break;
+ }
+ case AF_INET6:
+ {
+ const struct sockaddr_in6 *i6;
+
+ GNUNET_assert (sizeof(struct sockaddr_in6) == addrlen);
+ i6 = (const struct sockaddr_in6 *) addr;
+ if (0 == ntohs (i6->sin6_port))
+ return; /* Port = 0 means unmapped, ignore these for XU. */
+ memset (&u6,
+ 0,
+ sizeof(u6));
+ u6.options = htonl (plugin->myoptions);
+ u6.ipv6_addr = i6->sin6_addr;
+ u6.u6_port = i6->sin6_port;
+ arg = &u6;
+ args = sizeof (struct IPv6XuAddress);
+ break;
+ }
+ default:
+ GNUNET_break (0);
+ return;
+ }
+ /* modify our published address list */
+ /* TODO: use 'ac' here in the future... */
+ address = GNUNET_HELLO_address_allocate (plugin->env->my_identity,
+ PLUGIN_NAME,
+ arg,
+ args,
+ GNUNET_HELLO_ADDRESS_INFO_NONE);
+ plugin->env->notify_address (plugin->env->cls,
+ add_remove,
+ address);
+ GNUNET_HELLO_address_free (address);
+}
+
+
+/* ********************* Finding sessions ******************* */
+
+
+/**
+ * Closure for #session_cmp_it().
+ */
+struct GNUNET_ATS_SessionCompareContext
+{
+ /**
+ * Set to session matching the address.
+ */
+ struct GNUNET_ATS_Session *res;
+
+ /**
+ * Address we are looking for.
+ */
+ const struct GNUNET_HELLO_Address *address;
+};
+
+
+/**
+ * Find a session with a matching address.
+ *
+ * @param cls the `struct GNUNET_ATS_SessionCompareContext *`
+ * @param key peer identity (unused)
+ * @param value the `struct GNUNET_ATS_Session *`
+ * @return #GNUNET_NO if we found the session, #GNUNET_OK if not
+ */
+static int
+session_cmp_it (void *cls,
+ const struct GNUNET_PeerIdentity *key,
+ void *value)
+{
+ struct GNUNET_ATS_SessionCompareContext *cctx = cls;
+ struct GNUNET_ATS_Session *s = value;
+
+ (void) key;
+ if (0 == GNUNET_HELLO_address_cmp (s->address,
+ cctx->address))
+ {
+ GNUNET_assert (GNUNET_NO == s->in_destroy);
+ cctx->res = s;
+ return GNUNET_NO;
+ }
+ return GNUNET_OK;
+}
+
+
+/**
+ * Locate an existing session the transport service is using to
+ * send data to another peer. Performs some basic sanity checks
+ * on the address and then tries to locate a matching session.
+ *
+ * @param cls the plugin
+ * @param address the address we should locate the session by
+ * @return the session if it exists, or NULL if it is not found
+ */
+static struct GNUNET_ATS_Session *
+xu_plugin_lookup_session (void *cls,
+ const struct GNUNET_HELLO_Address *address)
+{
+ struct Plugin *plugin = cls;
+ const struct IPv6XuAddress *xu_a6;
+ const struct IPv4XuAddress *xu_a4;
+ struct GNUNET_ATS_SessionCompareContext cctx;
+
+ if (NULL == address->address)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ if (sizeof(struct IPv4XuAddress) == address->address_length)
+ {
+ if (NULL == plugin->sockv4)
+ return NULL;
+ xu_a4 = (const struct IPv4XuAddress *) address->address;
+ if (0 == xu_a4->u4_port)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ }
+ else if (sizeof(struct IPv6XuAddress) == address->address_length)
+ {
+ if (NULL == plugin->sockv6)
+ return NULL;
+ xu_a6 = (const struct IPv6XuAddress *) address->address;
+ if (0 == xu_a6->u6_port)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ }
+ else
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+
+ /* check if session already exists */
+ cctx.address = address;
+ cctx.res = NULL;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Looking for existing session for peer `%s' with address `%s'\n",
+ GNUNET_i2s (&address->peer),
+ xu_address_to_string (plugin,
+ address->address,
+ address->address_length));
+ GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
+ &address->peer,
+ &session_cmp_it,
+ &cctx);
+ if (NULL == cctx.res)
+ return NULL;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Found existing session %p\n",
+ cctx.res);
+ return cctx.res;
+}
+
+
+/* ********************** Timeout ****************** */
+
+
+/**
+ * Increment session timeout due to activity.
+ *
+ * @param s session to reschedule timeout activity for
+ */
+static void
+reschedule_session_timeout (struct GNUNET_ATS_Session *s)
+{
+ if (GNUNET_YES == s->in_destroy)
+ return;
+ GNUNET_assert (NULL != s->timeout_task);
+ s->timeout = GNUNET_TIME_relative_to_absolute (XU_SESSION_TIME_OUT);
+}
+
+
+
+/**
+ * Function that will be called whenever the transport service wants to
+ * notify the plugin that a session is still active and in use and
+ * therefore the session timeout for this session has to be updated
+ *
+ * @param cls closure with the `struct Plugin`
+ * @param peer which peer was the session for
+ * @param session which session is being updated
+ */
+static void
+xu_plugin_update_session_timeout (void *cls,
+ const struct GNUNET_PeerIdentity *peer,
+ struct GNUNET_ATS_Session *session)
+{
+ struct Plugin *plugin = cls;
+
+ if (GNUNET_YES !=
+ GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
+ peer,
+ session))
+ {
+ GNUNET_break (0);
+ return;
+ }
+ /* Reschedule session timeout */
+ reschedule_session_timeout (session);
+}
+
+
+/* ************************* Sending ************************ */
+
+
+/**
+ * We failed to transmit a message via XU. Generate
+ * a descriptive error message.
+ *
+ * @param plugin our plugin
+ * @param sa target address we were trying to reach
+ * @param slen number of bytes in @a sa
+ * @param error the errno value returned from the sendto() call
+ */
+static void
+analyze_send_error (struct Plugin *plugin,
+ const struct sockaddr *sa,
+ socklen_t slen,
+ int error)
+{
+ enum GNUNET_ATS_Network_Type type;
+
+ type = plugin->env->get_address_type (plugin->env->cls,
+ sa,
+ slen);
+ if ( ( (GNUNET_ATS_NET_LAN == type) ||
+ (GNUNET_ATS_NET_WAN == type) ) &&
+ ( (ENETUNREACH == errno) ||
+ (ENETDOWN == errno) ) )
+ {
+ if (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,
+ _("XU could not transmit message to `%s': "
+ "Network seems down, please check your network configuration\n"),
+ GNUNET_a2s (sa,
+ slen));
+ }
+ if (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,
+ _("XU could not transmit IPv6 message! "
+ "Please check your network configuration and disable IPv6 if your "
+ "connection does not have a global IPv6 address\n"));
+ }
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "XU could not transmit message to `%s': `%s'\n",
+ GNUNET_a2s (sa,
+ slen),
+ STRERROR (error));
+ }
+}
+
+
+
+
+/**
+ * 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 @a 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 @a 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
+xu_plugin_send (void *cls,
+ struct GNUNET_ATS_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 xumlen = msgbuf_size + sizeof(struct XUMessage);
+ struct XUMessage *xu;
+ char mbuf[xumlen] GNUNET_ALIGN;
+ ssize_t sent;
+ socklen_t slen;
+ const struct sockaddr *a;
+ const struct IPv4XuAddress *u4;
+ struct sockaddr_in a4;
+ const struct IPv6XuAddress *u6;
+ struct sockaddr_in6 a6;
+ struct GNUNET_NETWORK_Handle *sock;
+
+ (void) priority;
+ (void) to;
+ if ( (sizeof(struct IPv6XuAddress) == s->address->address_length) &&
+ (NULL == plugin->sockv6) )
+ return GNUNET_SYSERR;
+ if ( (sizeof(struct IPv4XuAddress) == s->address->address_length) &&
+ (NULL == plugin->sockv4) )
+ return GNUNET_SYSERR;
+ if (xumlen >= GNUNET_MAX_MESSAGE_SIZE)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ if (GNUNET_YES !=
+ GNUNET_CONTAINER_multipeermap_contains_value (plugin->sessions,
+ &s->target,
+ s))
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "XU transmits %u-byte message to `%s' using address `%s'\n",
+ xumlen,
+ GNUNET_i2s (&s->target),
+ xu_address_to_string (plugin,
+ s->address->address,
+ s->address->address_length));
+ xu = (struct XUMessage *) mbuf;
+ xu->header.size = htons (xumlen);
+ xu->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_XU_MESSAGE);
+ xu->reserved = htonl (0);
+ xu->sender = *plugin->env->my_identity;
+ GNUNET_memcpy (&xu[1],
+ msgbuf,
+ msgbuf_size);
+
+ if (sizeof (struct IPv4XuAddress) == s->address->address_length)
+ {
+ u4 = s->address->address;
+ 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;
+ a = (const struct sockaddr *) &a4;
+ slen = sizeof (a4);
+ sock = plugin->sockv4;
+ }
+ else if (sizeof (struct IPv6XuAddress) == s->address->address_length)
+ {
+ u6 = s->address->address;
+ 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;
+ a6.sin6_addr = u6->ipv6_addr;
+ a = (const struct sockaddr *) &a6;
+ slen = sizeof (a6);
+ sock = plugin->sockv6;
+ }
+ else
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+
+ sent = GNUNET_NETWORK_socket_sendto (sock,
+ mbuf,
+ xumlen,
+ a,
+ slen);
+ s->last_transmit_time
+ = GNUNET_TIME_absolute_max (GNUNET_TIME_absolute_get (),
+ s->last_transmit_time);
+
+ if (GNUNET_SYSERR == sent)
+ {
+ /* Failure */
+ analyze_send_error (plugin,
+ a,
+ slen,
+ errno);
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# XU, total, bytes, sent, failure",
+ sent,
+ GNUNET_NO);
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# XU, total, messages, sent, failure",
+ 1,
+ GNUNET_NO);
+ return GNUNET_SYSERR;
+ }
+ /* Success */
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "XU transmitted %u-byte message to `%s' `%s' (%d: %s)\n",
+ (unsigned int) (msgbuf_size),
+ GNUNET_i2s (&s->target),
+ GNUNET_a2s (a,
+ slen),
+ (int ) sent,
+ (sent < 0) ? STRERROR (errno) : "ok");
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# XU, total, bytes, sent, success",
+ sent,
+ GNUNET_NO);
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# XU, total, messages, sent, success",
+ 1,
+ GNUNET_NO);
+ cont (cont_cls,
+ &s->target,
+ GNUNET_OK,
+ msgbuf_size,
+ xumlen);
+ notify_session_monitor (s->plugin,
+ s,
+ GNUNET_TRANSPORT_SS_UPDATE);
+ return xumlen;
+}
+
+
+/* ********************** Receiving ********************** */
+
+
+/**
+ * Functions with this signature are called whenever we need to close
+ * a session due to a disconnect or failure to establish a connection.
+ *
+ * @param cls closure with the `struct Plugin`
+ * @param s session to close down
+ * @return #GNUNET_OK on success
+ */
+static int
+xu_disconnect_session (void *cls,
+ struct GNUNET_ATS_Session *s)
+{
+ struct Plugin *plugin = cls;
+
+ GNUNET_assert (GNUNET_YES != s->in_destroy);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Session %p to peer `%s' at address %s ended\n",
+ s,
+ GNUNET_i2s (&s->target),
+ xu_address_to_string (plugin,
+ s->address->address,
+ s->address->address_length));
+ if (NULL != s->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (s->timeout_task);
+ s->timeout_task = NULL;
+ }
+ GNUNET_assert (GNUNET_YES ==
+ GNUNET_CONTAINER_multipeermap_remove (plugin->sessions,
+ &s->target,
+ s));
+ s->in_destroy = GNUNET_YES;
+ notify_session_monitor (s->plugin,
+ s,
+ GNUNET_TRANSPORT_SS_DONE);
+ plugin->env->session_end (plugin->env->cls,
+ s->address,
+ s);
+ GNUNET_STATISTICS_set (plugin->env->stats,
+ "# XU sessions active",
+ GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
+ GNUNET_NO);
+ if (0 == s->rc)
+ free_session (s);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Message tokenizer has broken up an incomming message. Pass it on
+ * to the service.
+ *
+ * @param cls the `struct GNUNET_ATS_Session *`
+ * @param hdr the actual message
+ * @return #GNUNET_OK (always)
+ */
+static int
+process_inbound_tokenized_messages (void *cls,
+ const struct GNUNET_MessageHeader *hdr)
+{
+ struct GNUNET_ATS_Session *session = cls;
+ struct Plugin *plugin = session->plugin;
+
+ if (GNUNET_YES == session->in_destroy)
+ return GNUNET_OK;
+ reschedule_session_timeout (session);
+ session->flow_delay_for_other_peer
+ = plugin->env->receive (plugin->env->cls,
+ session->address,
+ session,
+ hdr);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Destroy a session, plugin is being unloaded.
+ *
+ * @param cls the `struct Plugin`
+ * @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_PeerIdentity *key,
+ void *value)
+{
+ struct Plugin *plugin = cls;
+
+ (void) key;
+ xu_disconnect_session (plugin,
+ 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
+xu_disconnect (void *cls,
+ const struct GNUNET_PeerIdentity *target)
+{
+ struct Plugin *plugin = cls;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Disconnecting from peer `%s'\n",
+ GNUNET_i2s (target));
+ GNUNET_CONTAINER_multipeermap_get_multiple (plugin->sessions,
+ target,
+ &disconnect_and_free_it,
+ plugin);
+}
+
+
+/**
+ * Session was idle, so disconnect it.
+ *
+ * @param cls the `struct GNUNET_ATS_Session` to time out
+ */
+static void
+session_timeout (void *cls)
+{
+ struct GNUNET_ATS_Session *s = cls;
+ struct Plugin *plugin = s->plugin;
+ struct GNUNET_TIME_Relative left;
+
+ s->timeout_task = NULL;
+ left = GNUNET_TIME_absolute_get_remaining (s->timeout);
+ if (left.rel_value_us > 0)
+ {
+ /* not actually our turn yet, but let's at least update
+ the monitor, it may think we're about to die ... */
+ notify_session_monitor (s->plugin,
+ s,
+ GNUNET_TRANSPORT_SS_UPDATE);
+ s->timeout_task = GNUNET_SCHEDULER_add_delayed (left,
+ &session_timeout,
+ s);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Session %p was idle for %s, disconnecting\n",
+ s,
+ GNUNET_STRINGS_relative_time_to_string (XU_SESSION_TIME_OUT,
+ GNUNET_YES));
+ /* call session destroy function */
+ xu_disconnect_session (plugin,
+ s);
+}
+
+
+/**
+ * Allocate a new session for the given endpoint address.
+ * Note that this function does not inform the service
+ * of the new session, this is the responsibility of the
+ * caller (if needed).
+ *
+ * @param cls the `struct Plugin`
+ * @param address address of the other peer to use
+ * @param network_type network type the address belongs to
+ * @return NULL on error, otherwise session handle
+ */
+static struct GNUNET_ATS_Session *
+xu_plugin_create_session (void *cls,
+ const struct GNUNET_HELLO_Address *address,
+ enum GNUNET_ATS_Network_Type network_type)
+{
+ struct Plugin *plugin = cls;
+ struct GNUNET_ATS_Session *s;
+
+ s = GNUNET_new (struct GNUNET_ATS_Session);
+ s->mst = GNUNET_MST_create (&process_inbound_tokenized_messages,
+ s);
+ s->plugin = plugin;
+ s->address = GNUNET_HELLO_address_copy (address);
+ s->target = address->peer;
+ s->last_transmit_time = GNUNET_TIME_absolute_get ();
+ s->last_expected_ack_delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
+ 250);
+ s->last_expected_msg_delay = GNUNET_TIME_UNIT_MILLISECONDS;
+ s->flow_delay_from_other_peer = GNUNET_TIME_UNIT_ZERO;
+ s->flow_delay_for_other_peer = GNUNET_TIME_UNIT_ZERO;
+ s->timeout = GNUNET_TIME_relative_to_absolute (XU_SESSION_TIME_OUT);
+ s->timeout_task = GNUNET_SCHEDULER_add_delayed (XU_SESSION_TIME_OUT,
+ &session_timeout,
+ s);
+ s->scope = network_type;
+
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Creating new session %p for peer `%s' address `%s'\n",
+ s,
+ GNUNET_i2s (&address->peer),
+ xu_address_to_string (plugin,
+ address->address,
+ address->address_length));
+ GNUNET_assert (GNUNET_OK ==
+ GNUNET_CONTAINER_multipeermap_put (plugin->sessions,
+ &s->target,
+ s,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
+ GNUNET_STATISTICS_set (plugin->env->stats,
+ "# XU sessions active",
+ GNUNET_CONTAINER_multipeermap_size (plugin->sessions),
+ GNUNET_NO);
+ notify_session_monitor (plugin,
+ s,
+ GNUNET_TRANSPORT_SS_INIT);
+ return s;
+}
+
+
+/**
+ * Creates a new outbound session the transport service will use to
+ * send data to the peer.
+ *
+ * @param cls the `struct Plugin *`
+ * @param address the address
+ * @return the session or NULL of max connections exceeded
+ */
+static struct GNUNET_ATS_Session *
+xu_plugin_get_session (void *cls,
+ const struct GNUNET_HELLO_Address *address)
+{
+ struct Plugin *plugin = cls;
+ struct GNUNET_ATS_Session *s;
+ enum GNUNET_ATS_Network_Type network_type = GNUNET_ATS_NET_UNSPECIFIED;
+ const struct IPv4XuAddress *xu_v4;
+ const struct IPv6XuAddress *xu_v6;
+
+ if (NULL == address)
+ {
+ GNUNET_break (0);
+ return NULL;
+ }
+ if ( (address->address_length != sizeof(struct IPv4XuAddress)) &&
+ (address->address_length != sizeof(struct IPv6XuAddress)) )
+ {
+ GNUNET_break_op (0);
+ return NULL;
+ }
+ if (NULL != (s = xu_plugin_lookup_session (cls,
+ address)))
+ return s;
+
+ /* need to create new session */
+ if (sizeof (struct IPv4XuAddress) == address->address_length)
+ {
+ struct sockaddr_in v4;
+
+ xu_v4 = (const struct IPv4XuAddress *) address->address;
+ memset (&v4, '\0', sizeof (v4));
+ v4.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v4.sin_len = sizeof (struct sockaddr_in);
+#endif
+ v4.sin_port = xu_v4->u4_port;
+ v4.sin_addr.s_addr = xu_v4->ipv4_addr;
+ network_type = plugin->env->get_address_type (plugin->env->cls,
+ (const struct sockaddr *) &v4,
+ sizeof (v4));
+ }
+ if (sizeof (struct IPv6XuAddress) == address->address_length)
+ {
+ struct sockaddr_in6 v6;
+
+ xu_v6 = (const struct IPv6XuAddress *) address->address;
+ memset (&v6, '\0', sizeof (v6));
+ v6.sin6_family = AF_INET6;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v6.sin6_len = sizeof (struct sockaddr_in6);
+#endif
+ v6.sin6_port = xu_v6->u6_port;
+ v6.sin6_addr = xu_v6->ipv6_addr;
+ network_type = plugin->env->get_address_type (plugin->env->cls,
+ (const struct sockaddr *) &v6,
+ sizeof (v6));
+ }
+ GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
+ return xu_plugin_create_session (cls,
+ address,
+ network_type);
+}
+
+
+/**
+ * We've received a XU Message. Process it (pass contents to main service).
+ *
+ * @param plugin plugin context
+ * @param msg the message
+ * @param xu_addr sender address
+ * @param xu_addr_len number of bytes in @a xu_addr
+ * @param network_type network type the address belongs to
+ */
+static void
+process_xu_message (struct Plugin *plugin,
+ const struct XUMessage *msg,
+ const union XuAddress *xu_addr,
+ size_t xu_addr_len,
+ enum GNUNET_ATS_Network_Type network_type)
+{
+ struct GNUNET_ATS_Session *s;
+ struct GNUNET_HELLO_Address *address;
+
+ GNUNET_break (GNUNET_ATS_NET_UNSPECIFIED != network_type);
+ if (0 != ntohl (msg->reserved))
+ {
+ GNUNET_break_op(0);
+ return;
+ }
+ if (ntohs (msg->header.size)
+ < sizeof(struct GNUNET_MessageHeader) + sizeof(struct XUMessage))
+ {
+ GNUNET_break_op(0);
+ return;
+ }
+
+ address = GNUNET_HELLO_address_allocate (&msg->sender,
+ PLUGIN_NAME,
+ xu_addr,
+ xu_addr_len,
+ GNUNET_HELLO_ADDRESS_INFO_NONE);
+ if (NULL ==
+ (s = xu_plugin_lookup_session (plugin,
+ address)))
+ {
+ s = xu_plugin_create_session (plugin,
+ address,
+ network_type);
+ plugin->env->session_start (plugin->env->cls,
+ address,
+ s,
+ s->scope);
+ notify_session_monitor (plugin,
+ s,
+ GNUNET_TRANSPORT_SS_UP);
+ }
+ GNUNET_free (address);
+
+ s->rc++;
+ GNUNET_MST_from_buffer (s->mst,
+ (const char *) &msg[1],
+ ntohs (msg->header.size) - sizeof(struct XUMessage),
+ GNUNET_YES,
+ GNUNET_NO);
+ s->rc--;
+ if ( (0 == s->rc) &&
+ (GNUNET_YES == s->in_destroy) )
+ free_session (s);
+}
+
+
+/**
+ * Read and process a message from the given socket.
+ *
+ * @param plugin the overall plugin
+ * @param rsock socket to read from
+ */
+static void
+xu_select_read (struct Plugin *plugin,
+ struct GNUNET_NETWORK_Handle *rsock)
+{
+ socklen_t fromlen;
+ struct sockaddr_storage addr;
+ char buf[65536] GNUNET_ALIGN;
+ ssize_t size;
+ const struct GNUNET_MessageHeader *msg;
+ struct IPv4XuAddress v4;
+ struct IPv6XuAddress v6;
+ const struct sockaddr *sa;
+ const struct sockaddr_in *sa4;
+ const struct sockaddr_in6 *sa6;
+ const union XuAddress *int_addr;
+ size_t int_addr_len;
+ enum GNUNET_ATS_Network_Type network_type;
+
+ fromlen = sizeof (addr);
+ memset (&addr,
+ 0,
+ sizeof(addr));
+ size = GNUNET_NETWORK_socket_recvfrom (rsock,
+ buf,
+ sizeof (buf),
+ (struct sockaddr *) &addr,
+ &fromlen);
+ sa = (const struct sockaddr *) &addr;
+#if MINGW
+ /* On SOCK_DGRAM XU sockets recvfrom might fail with a
+ * WSAECONNRESET error to indicate that previous sendto() (yes, sendto!)
+ * on this socket has failed.
+ * Quote from MSDN:
+ * WSAECONNRESET - The virtual circuit was reset by the remote side
+ * executing a hard or abortive close. The application should close
+ * the socket; it is no longer usable. On a XU-datagram socket this
+ * error indicates a previous send operation resulted in an ICMP Port
+ * Unreachable message.
+ */
+ if ( (-1 == size) &&
+ (ECONNRESET == errno) )
+ return;
+#endif
+ if (-1 == size)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "XU failed to receive data: %s\n",
+ STRERROR (errno));
+ /* Connection failure or something. Not a protocol violation. */
+ return;
+ }
+
+ /* Check if this is a STUN packet */
+ if (GNUNET_NO !=
+ GNUNET_NAT_stun_handle_packet (plugin->nat,
+ (const struct sockaddr *) &addr,
+ fromlen,
+ buf,
+ size))
+ return; /* was STUN, do not process further */
+
+ if (((size_t) size) < sizeof(struct GNUNET_MessageHeader))
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "XU got %u bytes from %s, which is not enough for a GNUnet message header\n",
+ (unsigned int ) size,
+ GNUNET_a2s (sa,
+ fromlen));
+ /* _MAY_ be a connection failure (got partial message) */
+ /* But it _MAY_ also be that the other side uses non-GNUnet protocol. */
+ GNUNET_break_op (0);
+ return;
+ }
+
+ msg = (const struct GNUNET_MessageHeader *) buf;
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "XU received %u-byte message from `%s' type %u\n",
+ (unsigned int) size,
+ GNUNET_a2s (sa,
+ fromlen),
+ ntohs (msg->type));
+ if (size != ntohs (msg->size))
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "XU malformed message (size %u) header from %s\n",
+ (unsigned int) size,
+ GNUNET_a2s (sa,
+ fromlen));
+ GNUNET_break_op (0);
+ return;
+ }
+ GNUNET_STATISTICS_update (plugin->env->stats,
+ "# XU, total bytes received",
+ size,
+ GNUNET_NO);
+ network_type = plugin->env->get_address_type (plugin->env->cls,
+ sa,
+ fromlen);
+ switch (sa->sa_family)
+ {
+ case AF_INET:
+ sa4 = (const struct sockaddr_in *) &addr;
+ v4.options = 0;
+ v4.ipv4_addr = sa4->sin_addr.s_addr;
+ v4.u4_port = sa4->sin_port;
+ int_addr = (union XuAddress *) &v4;
+ int_addr_len = sizeof (v4);
+ break;
+ case AF_INET6:
+ sa6 = (const struct sockaddr_in6 *) &addr;
+ v6.options = 0;
+ v6.ipv6_addr = sa6->sin6_addr;
+ v6.u6_port = sa6->sin6_port;
+ int_addr = (union XuAddress *) &v6;
+ int_addr_len = sizeof (v6);
+ break;
+ default:
+ GNUNET_break (0);
+ return;
+ }
+
+ switch (ntohs (msg->type))
+ {
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_XU_MESSAGE:
+ if (ntohs (msg->size) < sizeof(struct XUMessage))
+ {
+ GNUNET_break_op(0);
+ return;
+ }
+ process_xu_message (plugin,
+ (const struct XUMessage *) msg,
+ int_addr,
+ int_addr_len,
+ network_type);
+ return;
+ default:
+ GNUNET_break_op(0);
+ return;
+ }
+}
+
+
+/* ***************** Event loop (part 2) *************** */
+
+
+/**
+ * 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
+ */
+static void
+xu_plugin_select_v4 (void *cls)
+{
+ struct Plugin *plugin = cls;
+ const struct GNUNET_SCHEDULER_TaskContext *tc;
+
+ plugin->select_task_v4 = NULL;
+ if (NULL == plugin->sockv4)
+ return;
+ tc = GNUNET_SCHEDULER_get_task_context ();
+ if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready,
+ plugin->sockv4)) )
+ xu_select_read (plugin,
+ plugin->sockv4);
+ schedule_select_v4 (plugin);
+}
+
+
+/**
+ * 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
+ */
+static void
+xu_plugin_select_v6 (void *cls)
+{
+ struct Plugin *plugin = cls;
+ const struct GNUNET_SCHEDULER_TaskContext *tc;
+
+ plugin->select_task_v6 = NULL;
+ if (NULL == plugin->sockv6)
+ return;
+ tc = GNUNET_SCHEDULER_get_task_context ();
+ if ( (0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready,
+ plugin->sockv6)) )
+ xu_select_read (plugin,
+ plugin->sockv6);
+ schedule_select_v6 (plugin);
+}
+
+
+/* ******************* Initialization *************** */
+
+
+/**
+ * Setup the XU sockets (for IPv4 and IPv6) for the plugin.
+ *
+ * @param plugin the plugin to initialize
+ * @param bind_v6 IPv6 address to bind to (can be NULL, for 'any')
+ * @param bind_v4 IPv4 address to bind to (can be NULL, for 'any')
+ * @return number of sockets that were successfully bound
+ */
+static unsigned int
+setup_sockets (struct Plugin *plugin,
+ const struct sockaddr_in6 *bind_v6,
+ const struct sockaddr_in *bind_v4)
+{
+ int tries;
+ unsigned int sockets_created = 0;
+ struct sockaddr_in6 server_addrv6;
+ struct sockaddr_in server_addrv4;
+ const struct sockaddr *server_addr;
+ const struct sockaddr *addrs[2];
+ socklen_t addrlens[2];
+ socklen_t addrlen;
+ int eno;
+
+ /* Create IPv6 socket */
+ eno = EINVAL;
+ if (GNUNET_YES == plugin->enable_ipv6)
+ {
+ plugin->sockv6 = GNUNET_NETWORK_socket_create (PF_INET6,
+ SOCK_DGRAM,
+ 0);
+ if (NULL == plugin->sockv6)
+ {
+ LOG (GNUNET_ERROR_TYPE_INFO,
+ _("Disabling IPv6 since it is not supported on this system!\n"));
+ plugin->enable_ipv6 = GNUNET_NO;
+ }
+ else
+ {
+ memset (&server_addrv6,
+ 0,
+ sizeof(struct sockaddr_in6));
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ server_addrv6.sin6_len = sizeof (struct sockaddr_in6);
+#endif
+ server_addrv6.sin6_family = AF_INET6;
+ if (NULL != bind_v6)
+ server_addrv6.sin6_addr = bind_v6->sin6_addr;
+ else
+ server_addrv6.sin6_addr = in6addr_any;
+
+ if (0 == plugin->port) /* autodetect */
+ server_addrv6.sin6_port
+ = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
+ 33537)
+ + 32000);
+ else
+ server_addrv6.sin6_port = htons (plugin->port);
+ addrlen = sizeof (struct sockaddr_in6);
+ server_addr = (const struct sockaddr *) &server_addrv6;
+
+ tries = 0;
+ while (tries < 10)
+ {
+ LOG(GNUNET_ERROR_TYPE_DEBUG,
+ "Binding to IPv6 `%s'\n",
+ GNUNET_a2s (server_addr,
+ addrlen));
+ /* binding */
+ if (GNUNET_OK ==
+ GNUNET_NETWORK_socket_bind (plugin->sockv6,
+ server_addr,
+ addrlen))
+ break;
+ eno = errno;
+ if (0 != plugin->port)
+ {
+ tries = 10; /* fail immediately */
+ break; /* bind failed on specific port */
+ }
+ /* autodetect */
+ server_addrv6.sin6_port
+ = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
+ 33537)
+ + 32000);
+ tries++;
+ }
+ if (tries >= 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv6);
+ plugin->enable_ipv6 = GNUNET_NO;
+ plugin->sockv6 = NULL;
+ }
+ else
+ {
+ plugin->port = ntohs (server_addrv6.sin6_port);
+ }
+ if (NULL != plugin->sockv6)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv6 XU socket created listinging at %s\n",
+ GNUNET_a2s (server_addr,
+ addrlen));
+ addrs[sockets_created] = server_addr;
+ addrlens[sockets_created] = addrlen;
+ sockets_created++;
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to bind XU socket to %s: %s\n"),
+ GNUNET_a2s (server_addr,
+ addrlen),
+ STRERROR (eno));
+ }
+ }
+ }
+
+ /* Create IPv4 socket */
+ eno = EINVAL;
+ plugin->sockv4 = GNUNET_NETWORK_socket_create (PF_INET,
+ SOCK_DGRAM,
+ 0);
+ if (NULL == plugin->sockv4)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING,
+ "socket");
+ LOG (GNUNET_ERROR_TYPE_INFO,
+ _("Disabling IPv4 since it is not supported on this system!\n"));
+ plugin->enable_ipv4 = GNUNET_NO;
+ }
+ else
+ {
+ memset (&server_addrv4,
+ 0,
+ sizeof(struct sockaddr_in));
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ server_addrv4.sin_len = sizeof (struct sockaddr_in);
+#endif
+ server_addrv4.sin_family = AF_INET;
+ if (NULL != bind_v4)
+ server_addrv4.sin_addr = bind_v4->sin_addr;
+ else
+ server_addrv4.sin_addr.s_addr = INADDR_ANY;
+
+ if (0 == plugin->port)
+ /* autodetect */
+ server_addrv4.sin_port
+ = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
+ 33537)
+ + 32000);
+ else
+ server_addrv4.sin_port = htons (plugin->port);
+
+ addrlen = sizeof (struct sockaddr_in);
+ server_addr = (const struct sockaddr *) &server_addrv4;
+
+ tries = 0;
+ while (tries < 10)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding to IPv4 `%s'\n",
+ GNUNET_a2s (server_addr,
+ addrlen));
+
+ /* binding */
+ if (GNUNET_OK ==
+ GNUNET_NETWORK_socket_bind (plugin->sockv4,
+ server_addr,
+ addrlen))
+ break;
+ eno = errno;
+ if (0 != plugin->port)
+ {
+ tries = 10; /* fail */
+ break; /* bind failed on specific port */
+ }
+
+ /* autodetect */
+ server_addrv4.sin_port
+ = htons (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG,
+ 33537)
+ + 32000);
+ tries++;
+ }
+ if (tries >= 10)
+ {
+ GNUNET_NETWORK_socket_close (plugin->sockv4);
+ plugin->enable_ipv4 = GNUNET_NO;
+ plugin->sockv4 = NULL;
+ }
+ else
+ {
+ plugin->port = ntohs (server_addrv4.sin_port);
+ }
+
+ if (NULL != plugin->sockv4)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "IPv4 socket created on port %s\n",
+ GNUNET_a2s (server_addr,
+ addrlen));
+ addrs[sockets_created] = server_addr;
+ addrlens[sockets_created] = addrlen;
+ sockets_created++;
+ }
+ else
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to bind XU socket to %s: %s\n"),
+ GNUNET_a2s (server_addr,
+ addrlen),
+ STRERROR (eno));
+ }
+ }
+
+ if (0 == sockets_created)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ _("Failed to open XU sockets\n"));
+ return 0; /* No sockets created, return */
+ }
+ schedule_select_v4 (plugin);
+ schedule_select_v6 (plugin);
+ plugin->nat = GNUNET_NAT_register (plugin->env->cfg,
+ "transport-xu",
+ IPPROTO_UDP,
+ sockets_created,
+ addrs,
+ addrlens,
+ &xu_nat_port_map_callback,
+ NULL,
+ plugin);
+ return sockets_created;
+}
+
+
+/**
+ * The exported method. Makes the core api available via a global and
+ * returns the xu transport API.
+ *
+ * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
+ * @return our `struct GNUNET_TRANSPORT_PluginFunctions`
+ */
+void *
+libgnunet_plugin_transport_xu_init (void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
+ struct GNUNET_TRANSPORT_PluginFunctions *api;
+ struct Plugin *p;
+ unsigned long long port;
+ unsigned long long aport;
+ int enable_v6;
+ char *bind4_address;
+ char *bind6_address;
+ struct sockaddr_in server_addrv4;
+ struct sockaddr_in6 server_addrv6;
+ unsigned int res;
+ int have_bind4;
+ int have_bind6;
+
+ 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_new (struct GNUNET_TRANSPORT_PluginFunctions);
+ api->cls = NULL;
+ api->address_pretty_printer = &xu_plugin_address_pretty_printer;
+ api->address_to_string = &xu_address_to_string;
+ api->string_to_address = &xu_string_to_address;
+ return api;
+ }
+
+ /* Get port number: port == 0 : autodetect a port,
+ * > 0 : use this port, not given : 2086 default */
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg,
+ "transport-xu",
+ "PORT",
+ &port))
+ port = 2086;
+ if (port > 65535)
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "transport-xu",
+ "PORT",
+ _("must be in [0,65535]"));
+ return NULL;
+ }
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg,
+ "transport-xu",
+ "ADVERTISED_PORT",
+ &aport))
+ aport = port;
+ if (aport > 65535)
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "transport-xu",
+ "ADVERTISED_PORT",
+ _("must be in [0,65535]"));
+ return NULL;
+ }
+
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
+ "nat",
+ "DISABLEV6"))
+ enable_v6 = GNUNET_NO;
+ else
+ enable_v6 = GNUNET_YES;
+
+ have_bind4 = GNUNET_NO;
+ memset (&server_addrv4,
+ 0,
+ sizeof (server_addrv4));
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_string (env->cfg,
+ "transport-xu",
+ "BINDTO",
+ &bind4_address))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding XU plugin to specific address: `%s'\n",
+ bind4_address);
+ if (1 != inet_pton (AF_INET,
+ bind4_address,
+ &server_addrv4.sin_addr))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "transport-xu",
+ "BINDTO",
+ _("must be valid IPv4 address"));
+ GNUNET_free (bind4_address);
+ return NULL;
+ }
+ have_bind4 = GNUNET_YES;
+ }
+ GNUNET_free_non_null (bind4_address);
+ have_bind6 = GNUNET_NO;
+ memset (&server_addrv6,
+ 0,
+ sizeof (server_addrv6));
+ if (GNUNET_YES ==
+ GNUNET_CONFIGURATION_get_value_string (env->cfg,
+ "transport-xu",
+ "BINDTO6",
+ &bind6_address))
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Binding xu plugin to specific address: `%s'\n",
+ bind6_address);
+ if (1 != inet_pton (AF_INET6,
+ bind6_address,
+ &server_addrv6.sin6_addr))
+ {
+ GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
+ "transport-xu",
+ "BINDTO6",
+ _("must be valid IPv6 address"));
+ GNUNET_free (bind6_address);
+ return NULL;
+ }
+ have_bind6 = GNUNET_YES;
+ }
+ GNUNET_free_non_null (bind6_address);
+
+ p = GNUNET_new (struct Plugin);
+ p->port = port;
+ p->aport = aport;
+ p->enable_ipv6 = enable_v6;
+ p->enable_ipv4 = GNUNET_YES; /* default */
+ p->env = env;
+ p->sessions = GNUNET_CONTAINER_multipeermap_create (16,
+ GNUNET_NO);
+ res = setup_sockets (p,
+ (GNUNET_YES == have_bind6) ? &server_addrv6 : NULL,
+ (GNUNET_YES == have_bind4) ? &server_addrv4 : NULL);
+ if ( (0 == res) ||
+ ( (NULL == p->sockv4) &&
+ (NULL == p->sockv6) ) )
+ {
+ LOG (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to create XU network sockets\n"));
+ GNUNET_CONTAINER_multipeermap_destroy (p->sessions);
+ if (NULL != p->nat)
+ GNUNET_NAT_unregister (p->nat);
+ GNUNET_free (p);
+ return NULL;
+ }
+
+ api = GNUNET_new (struct GNUNET_TRANSPORT_PluginFunctions);
+ api->cls = p;
+ api->disconnect_session = &xu_disconnect_session;
+ api->query_keepalive_factor = &xu_query_keepalive_factor;
+ api->disconnect_peer = &xu_disconnect;
+ api->address_pretty_printer = &xu_plugin_address_pretty_printer;
+ api->address_to_string = &xu_address_to_string;
+ api->string_to_address = &xu_string_to_address;
+ api->check_address = &xu_plugin_check_address;
+ api->get_session = &xu_plugin_get_session;
+ api->send = &xu_plugin_send;
+ api->get_network = &xu_plugin_get_network;
+ api->get_network_for_address = &xu_plugin_get_network_for_address;
+ api->update_session_timeout = &xu_plugin_update_session_timeout;
+ api->setup_monitor = &xu_plugin_setup_monitor;
+ return api;
+}
+
+
+/**
+ * The exported method. Makes the core api available via a global and
+ * returns the xu transport API.
+ *
+ * @param cls our `struct GNUNET_TRANSPORT_PluginEnvironment`
+ * @return NULL
+ */
+void *
+libgnunet_plugin_transport_xu_done (void *cls)
+{
+ struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+ struct Plugin *plugin = api->cls;
+ struct PrettyPrinterContext *cur;
+
+ if (NULL == plugin)
+ {
+ GNUNET_free (api);
+ return NULL;
+ }
+ if (NULL != plugin->select_task_v4)
+ {
+ GNUNET_SCHEDULER_cancel (plugin->select_task_v4);
+ plugin->select_task_v4 = NULL;
+ }
+ if (NULL != plugin->select_task_v6)
+ {
+ GNUNET_SCHEDULER_cancel (plugin->select_task_v6);
+ plugin->select_task_v6 = NULL;
+ }
+ if (NULL != plugin->sockv4)
+ {
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (plugin->sockv4));
+ plugin->sockv4 = NULL;
+ }
+ if (NULL != plugin->sockv6)
+ {
+ GNUNET_break (GNUNET_OK ==
+ GNUNET_NETWORK_socket_close (plugin->sockv6));
+ plugin->sockv6 = NULL;
+ }
+ if (NULL != plugin->nat)
+ {
+ GNUNET_NAT_unregister (plugin->nat);
+ plugin->nat = NULL;
+ }
+ GNUNET_CONTAINER_multipeermap_destroy (plugin->sessions);
+
+ while (NULL != (cur = plugin->ppc_dll_head))
+ {
+ GNUNET_break (0);
+ GNUNET_CONTAINER_DLL_remove (plugin->ppc_dll_head,
+ plugin->ppc_dll_tail,
+ cur);
+ GNUNET_RESOLVER_request_cancel (cur->resolver_handle);
+ if (NULL != cur->timeout_task)
+ {
+ GNUNET_SCHEDULER_cancel (cur->timeout_task);
+ cur->timeout_task = NULL;
+ }
+ GNUNET_free (cur);
+ }
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
+}
+
+/* end of plugin_transport_xu.c */
projects / oweals / gnunet.git / commitdiff