/*
This file is part of GNUnet
- (C) 2001, 2002, 2003, 2004, 2005, 2008 Christian Grothoff (and other contributing authors)
+ (C) 2010 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 NAT punching
+ * transport service
* @author Christian Grothoff
+ * @author Nathan Evans
+ *
+ * The idea with this transport is to connect gnunet peers to each other
+ * when ONE is behind a NAT. This is based on pwnat (http://samy.pl/pwnat)
+ * created by Samy Kamkar. When configured with the PWNAT options, this
+ * transport will start a server daemon which sends dummy ICMP and UDP
+ * messages out to a predefined address (typically 1.2.3.4).
+ *
+ * When a non-NAT'd peer (the client) learns of the NAT'd peer (the server)
+ * address, it will send ICMP RESPONSES to the NAT'd peers external address.
+ * The NAT box should forward these faked responses to the server, which
+ * can then connect directly to the non-NAT'd peer.
+ */
+
+#include "platform.h"
+#include "gnunet_hello_lib.h"
+#include "gnunet_connection_lib.h"
+#include "gnunet_container_lib.h"
+#include "gnunet_os_lib.h"
+#include "gnunet_peerinfo_service.h"
+#include "gnunet_protocols.h"
+#include "gnunet_resolver_service.h"
+#include "gnunet_server_lib.h"
+#include "gnunet_service_lib.h"
+#include "gnunet_signatures.h"
+#include "gnunet_statistics_service.h"
+#include "gnunet_transport_service.h"
+#include "plugin_transport.h"
+#include "transport.h"
+
+#define DEBUG_UDP GNUNET_YES
+
+#define MAX_PROBES 20
+
+/*
+ * Transport cost to peer, always 1 for UDP (direct connection)
+ */
+#define UDP_DIRECT_DISTANCE 1
+
+#define DEFAULT_NAT_PORT 0
+
+/**
+ * How long until we give up on transmitting the welcome message?
+ */
+#define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
+
+/**
+ * Starting port for listening and sending, eventually a config value
+ */
+#define UDP_NAT_DEFAULT_PORT 22086
+
+/**
+ * UDP Message-Packet header.
+ */
+struct UDPMessage
+{
+ /**
+ * Message header.
+ */
+ struct GNUNET_MessageHeader header;
+
+ /**
+ * What is the identity of the sender (GNUNET_hash of public key)
+ */
+ struct GNUNET_PeerIdentity sender;
+
+};
+
+/**
+ * Network format for IPv4 addresses.
+ */
+struct IPv4UdpAddress
+{
+ /**
+ * IPv4 address, in network byte order.
+ */
+ uint32_t ipv4_addr GNUNET_PACKED;
+
+ /**
+ * Port number, in network byte order.
+ */
+ uint16_t u_port GNUNET_PACKED;
+};
+
+
+/**
+ * Network format for IPv6 addresses.
+ */
+struct IPv6UdpAddress
+{
+ /**
+ * IPv6 address.
+ */
+ struct in6_addr ipv6_addr GNUNET_PACKED;
+
+ /**
+ * Port number, in network byte order.
+ */
+ uint16_t u6_port GNUNET_PACKED;
+};
+
+/* Forward definition */
+struct Plugin;
+
+struct PrettyPrinterContext
+{
+ GNUNET_TRANSPORT_AddressStringCallback asc;
+ void *asc_cls;
+ uint16_t port;
+};
+
+struct MessageQueue
+{
+ /**
+ * Linked List
+ */
+ struct MessageQueue *next;
+
+ /**
+ * Session this message belongs to
+ */
+ struct PeerSession *session;
+
+ /**
+ * Actual message to be sent
+ */
+ char *msgbuf;
+
+ /**
+ * Size of message buffer to be sent
+ */
+ size_t msgbuf_size;
+
+ /**
+ * When to discard this message
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Continuation to call when this message goes out
+ */
+ GNUNET_TRANSPORT_TransmitContinuation cont;
+
+ /**
+ * closure for continuation
+ */
+ void *cont_cls;
+
+};
+
+/**
+ * UDP NAT Probe message definition
+ */
+struct UDP_NAT_ProbeMessage
+{
+ /**
+ * Message header
+ */
+ struct GNUNET_MessageHeader header;
+
+};
+
+/**
+ * UDP NAT Probe message reply definition
+ */
+struct UDP_NAT_ProbeMessageReply
+{
+ /**
+ * Message header
+ */
+ struct GNUNET_MessageHeader header;
+
+};
+
+
+/**
+ * UDP NAT Probe message confirm definition
+ */
+struct UDP_NAT_ProbeMessageConfirmation
+{
+ /**
+ * Message header
+ */
+ struct GNUNET_MessageHeader header;
+
+};
+
+
+/**
+ * Local network addresses (actual IP address follows this struct).
+ * PORT is NOT included!
+ */
+struct LocalAddrList
+{
+
+ /**
+ * This is a doubly linked list.
+ */
+ struct LocalAddrList *next;
+
+ /**
+ * This is a doubly linked list.
+ */
+ struct LocalAddrList *prev;
+
+ /**
+ * Number of bytes of the address that follow
+ */
+ size_t size;
+
+};
+
+
+/**
+ * UDP NAT "Session"
+ */
+struct PeerSession
+{
+
+ /**
+ * Stored in a linked list.
+ */
+ struct PeerSession *next;
+
+ /**
+ * Pointer to the global plugin struct.
+ */
+ struct Plugin *plugin;
+
+ /**
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
+ */
+ struct GNUNET_PeerIdentity target;
+
+ /**
+ * Address of the other peer (either based on our 'connect'
+ * call or on our 'accept' call).
+ */
+ void *connect_addr;
+
+ /**
+ * Length of connect_addr.
+ */
+ size_t connect_alen;
+
+ /**
+ * Are we still expecting the welcome message? (GNUNET_YES/GNUNET_NO)
+ */
+ int expecting_welcome;
+
+ /**
+ * From which socket do we need to send to this peer?
+ */
+ struct GNUNET_NETWORK_Handle *sock;
+
+ /*
+ * Queue of messages for this peer, in the case that
+ * we have to await a connection...
+ */
+ struct MessageQueue *messages;
+
+};
+
+struct UDP_NAT_Probes
+{
+
+ /**
+ * Linked list
+ */
+ struct UDP_NAT_Probes *next;
+
+ /**
+ * Address string that the server process returned to us
+ */
+ char *address_string;
+
+ /**
+ * Timeout for this set of probes
+ */
+ struct GNUNET_TIME_Absolute timeout;
+
+ /**
+ * Count of how many probes we've attempted
+ */
+ int count;
+
+ /**
+ * The plugin this probe belongs to
+ */
+ struct Plugin *plugin;
+
+ /**
+ * The task used to send these probes
+ */
+ GNUNET_SCHEDULER_TaskIdentifier task;
+
+ /**
+ * Network address (always ipv4!)
+ */
+ struct IPv4UdpAddress addr;
+
+};
+
+
+/**
+ * Encapsulation of all of the state of the plugin.
+ */
+struct Plugin
+{
+ /**
+ * Our environment.
+ */
+ struct GNUNET_TRANSPORT_PluginEnvironment *env;
+
+ /**
+ * Handle to the network service.
+ */
+ struct GNUNET_SERVICE_Context *service;
+
+ /*
+ * Session of peers with whom we are currently connected
+ */
+ struct PeerSession *sessions;
+
+ /**
+ * Handle for request of hostname resolution, non-NULL if pending.
+ */
+ struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
+
+ /**
+ * ID of task used to update our addresses when one expires.
+ */
+ GNUNET_SCHEDULER_TaskIdentifier address_update_task;
+
+ /**
+ * ID of select task
+ */
+ GNUNET_SCHEDULER_TaskIdentifier select_task;
+
+ /**
+ * Port to listen on.
+ */
+ uint16_t port;
+
+ /**
+ * The external address given to us by the user. Must be actual
+ * outside visible address for NAT punching to work.
+ */
+ char *external_address;
+
+ /**
+ * The internal address given to us by the user (or discovered).
+ */
+ char *internal_address;
+
+ /**
+ * List of our IP addresses.
+ */
+ struct LocalAddrList *lal_head;
+
+ /**
+ * Tail of our IP address list.
+ */
+ struct LocalAddrList *lal_tail;
+
+ /**
+ * FD Read set
+ */
+ struct GNUNET_NETWORK_FDSet *rs;
+
+ /**
+ * stdout pipe handle for the gnunet-nat-server process
+ */
+ struct GNUNET_DISK_PipeHandle *server_stdout;
+
+ /**
+ * stdout file handle (for reading) for the gnunet-nat-server process
+ */
+ const struct GNUNET_DISK_FileHandle *server_stdout_handle;
+
+ /**
+ * ID of select gnunet-nat-server stdout read task
+ */
+ GNUNET_SCHEDULER_TaskIdentifier server_read_task;
+
+ /**
+ * Is this transport configured to be behind a NAT?
+ */
+ int behind_nat;
+
+ /**
+ * Is this transport configured to allow connections to NAT'd peers?
+ */
+ int allow_nat;
+
+ /**
+ * Should this transport advertise only NAT addresses (port set to 0)?
+ * If not, all addresses will be duplicated for NAT punching and regular
+ * ports.
+ */
+ int only_nat_addresses;
+
+ /**
+ * The process id of the server process (if behind NAT)
+ */
+ pid_t server_pid;
+
+ /**
+ * Probes in flight
+ */
+ struct UDP_NAT_Probes *probes;
+
+};
+
+
+struct UDP_Sock_Info
+{
+ /* The network handle */
+ struct GNUNET_NETWORK_Handle *desc;
+
+ /* The port we bound to */
+ int port;
+};
+
+/* *********** globals ************* */
+
+/**
+ * the socket that we transmit all data with
+ */
+static struct UDP_Sock_Info udp_sock;
+
+
+/**
+ * Forward declaration.
+ */
+void
+udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
+
+
+/**
+ * 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
+ */
+void
+udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
+{
+ /** TODO: Implement! */
+ return;
+}
+
+/**
+ * Shutdown the server process (stop receiving inbound traffic). Maybe
+ * restarted later!
+ *
+ * @param cls Handle to the plugin for this transport
+ *
+ * @return returns the number of sockets successfully closed,
+ * should equal the number of sockets successfully opened
+ */
+static int
+udp_transport_server_stop (void *cls)
+{
+ struct Plugin *plugin = cls;
+ int ret;
+ int ok;
+
+ ret = 0;
+ if (plugin->select_task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel (plugin->env->sched, plugin->select_task);
+ plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
+ }
+
+ ok = GNUNET_NETWORK_socket_close (udp_sock.desc);
+ if (ok == GNUNET_OK)
+ udp_sock.desc = NULL;
+ ret += ok;
+
+ if (plugin->behind_nat == GNUNET_YES)
+ {
+ if (0 != PLIBC_KILL (plugin->server_pid, SIGTERM))
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "kill");
+ }
+ GNUNET_OS_process_wait (plugin->server_pid);
+ }
+
+ if (ret != GNUNET_OK)
+ return GNUNET_SYSERR;
+ return ret;
+}
+
+
+struct PeerSession *
+find_session (struct Plugin *plugin, const struct GNUNET_PeerIdentity *peer)
+{
+ struct PeerSession *pos;
+
+ pos = plugin->sessions;
+ while (pos != NULL)
+ {
+ if (memcmp(&pos->target, peer, sizeof(struct GNUNET_PeerIdentity)) == 0)
+ return pos;
+ pos = pos->next;
+ }
+
+ return pos;
+}
+
+
+/**
+ * Actually send out the message, assume we've got the address and
+ * send_handle squared away!
+ *
+ * @param cls closure
+ * @param send_handle which handle to send message on
+ * @param target who should receive this message (ignored by UDP)
+ * @param msgbuf one or more GNUNET_MessageHeader(s) strung together
+ * @param msgbuf_size the size of the msgbuf to send
+ * @param priority how important is the message (ignored by UDP)
+ * @param timeout when should we time out (give up) if we can not transmit?
+ * @param addr the addr to send the message to, needs to be a sockaddr for us
+ * @param addrlen the len of addr
+ * @param cont continuation to call once the message has
+ * been transmitted (or if the transport is ready
+ * for the next transmission call; or if the
+ * peer disconnected...)
+ * @param cont_cls closure for cont
+ * @return the number of bytes written
+ */
+static ssize_t
+udp_real_send (void *cls,
+ struct GNUNET_NETWORK_Handle *send_handle,
+ const struct GNUNET_PeerIdentity *target,
+ const char *msgbuf,
+ size_t msgbuf_size,
+ unsigned int priority,
+ struct GNUNET_TIME_Relative timeout,
+ const void *addr,
+ size_t addrlen,
+ GNUNET_TRANSPORT_TransmitContinuation cont,
+ void *cont_cls)
+{
+ struct Plugin *plugin = cls;
+ struct UDPMessage *message;
+ int ssize;
+ ssize_t sent;
+ struct sockaddr_in a4;
+ struct sockaddr_in6 a6;
+ const struct IPv4UdpAddress *t4;
+ const struct IPv6UdpAddress *t6;
+ const void *sb;
+ size_t sbs;
+
+ if ((addr == NULL) || (addrlen == 0))
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
+ ("udp_real_send called without address, returning!\n"));
+#endif
+ if (cont != NULL)
+ cont (cont_cls, target, GNUNET_SYSERR);
+ return 0; /* Can never send if we don't have an address!! */
+ }
+
+ /* Build the message to be sent */
+ message = GNUNET_malloc (sizeof (struct UDPMessage) + msgbuf_size);
+ ssize = sizeof (struct UDPMessage) + msgbuf_size;
+
+ message->header.size = htons (ssize);
+ message->header.type = htons (0);
+ memcpy (&message->sender, plugin->env->my_identity,
+ sizeof (struct GNUNET_PeerIdentity));
+ memcpy (&message[1], msgbuf, msgbuf_size);
+
+ if (addrlen == sizeof (struct IPv6UdpAddress))
+ {
+ t6 = addr;
+ 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 = t6->u6_port;
+ memcpy (&a6.sin6_addr,
+ &t6->ipv6_addr,
+ sizeof (struct in6_addr));
+ sb = &a6;
+ sbs = sizeof (a6);
+ }
+ else if (addrlen == sizeof (struct IPv4UdpAddress))
+ {
+ t4 = addr;
+ 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 = t4->u_port;
+ a4.sin_addr.s_addr = t4->ipv4_addr;
+ sb = &a4;
+ sbs = sizeof (a4);
+ }
+ else
+ {
+ GNUNET_break_op (0);
+ GNUNET_free (message);
+ return -1;
+ }
+
+ /* Actually send the message */
+ sent =
+ GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
+ sb,
+ sbs);
+
+ if (cont != NULL)
+ {
+ if (sent == GNUNET_SYSERR)
+ cont (cont_cls, target, GNUNET_SYSERR);
+ else
+ {
+ cont (cont_cls, target, GNUNET_OK);
+ }
+ }
+
+ GNUNET_free (message);
+ return sent;
+}
+
+/**
+ * We learned about a peer (possibly behind NAT) so run the
+ * gnunet-nat-client to send dummy ICMP responses
+ *
+ * @param plugin the plugin for this transport
+ * @param addr the address of the peer
+ * @param addrlen the length of the address
+ */
+void
+run_gnunet_nat_client (struct Plugin *plugin, const char *addr, size_t addrlen)
+{
+ char addr_buf[INET_ADDRSTRLEN];
+ char *address_as_string;
+ char *port_as_string;
+ pid_t pid;
+ const struct IPv4UdpAddress *t4;
+
+ GNUNET_assert(addrlen == sizeof(struct IPv4UdpAddress));
+ t4 = (struct IPv4UdpAddress *)addr;
+
+ if (NULL == inet_ntop (AF_INET,
+ &t4->u_port,
+ addr_buf, INET_ADDRSTRLEN))
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
+ return;
+ }
+ address_as_string = GNUNET_strdup (addr_buf);
+ GNUNET_asprintf(&port_as_string, "%d", plugin->port);
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Running gnunet-nat-client with arguments: %s %s %d\n"), plugin->external_address, address_as_string, plugin->port);
+#endif
+
+ /* Start the server process */
+ pid = GNUNET_OS_start_process(NULL, NULL, "gnunet-nat-client", "gnunet-nat-client", plugin->external_address, address_as_string, port_as_string, NULL);
+ GNUNET_free(address_as_string);
+ GNUNET_free(port_as_string);
+ GNUNET_OS_process_wait (pid);
+}
+
+/**
+ * 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 msgbuf_size the size of the msgbuf to send
+ * @param priority how important is the message (ignored by UDP)
+ * @param timeout when should we time out (give up) if we can not transmit?
+ * @param session identifier used for this session (can be NULL)
+ * @param addr the addr to send the message to, needs to be a sockaddr for us
+ * @param addrlen the len of addr
+ * @param force_address not used, we had better have an address to send to
+ * because we are stateless!!
+ * @param cont continuation to call once the message has
+ * been transmitted (or if the transport is ready
+ * for the next transmission call; or if the
+ * peer disconnected...)
+ * @param cont_cls closure for cont
+ *
+ * @return the number of bytes written (may return 0 and the message can
+ * still be transmitted later!)
+ */
+static ssize_t
+udp_plugin_send (void *cls,
+ const struct GNUNET_PeerIdentity *target,
+ const char *msgbuf,
+ size_t msgbuf_size,
+ unsigned int priority,
+ struct GNUNET_TIME_Relative timeout,
+ struct Session *session,
+ const void *addr,
+ size_t addrlen,
+ int force_address,
+ GNUNET_TRANSPORT_TransmitContinuation cont, void *cont_cls)
+{
+ struct Plugin *plugin = cls;
+ ssize_t sent;
+ struct MessageQueue *temp_message;
+ struct PeerSession *peer_session;
+ int other_peer_natd;
+ const struct IPv4UdpAddress *t4;
+
+ GNUNET_assert (NULL == session);
+
+ other_peer_natd = GNUNET_NO;
+ if (addrlen == sizeof(struct IPv4UdpAddress))
+ {
+ t4 = addr;
+ if (ntohs(t4->u_port) == 0)
+ other_peer_natd = GNUNET_YES;
+ }
+ else if (addrlen != sizeof(struct IPv6UdpAddress))
+ {
+ GNUNET_break_op(0);
+ return -1; /* Must have an address to send to */
+ }
+
+ sent = 0;
+
+ if ((other_peer_natd == GNUNET_YES) && (plugin->allow_nat == GNUNET_YES))
+ {
+ peer_session = find_session(plugin, target);
+ if (peer_session == NULL) /* We have a new peer to add */
+ {
+ /*
+ * The first time, we can assume we have no knowledge of a
+ * working port for this peer, call the ICMP/UDP message sender
+ * and wait...
+ */
+ peer_session = GNUNET_malloc(sizeof(struct PeerSession));
+ peer_session->connect_addr = GNUNET_malloc(addrlen);
+ memcpy(peer_session->connect_addr, addr, addrlen);
+ peer_session->connect_alen = addrlen;
+ peer_session->plugin = plugin;
+ peer_session->sock = NULL;
+ memcpy(&peer_session->target, target, sizeof(struct GNUNET_PeerIdentity));
+ peer_session->expecting_welcome = GNUNET_YES;
+
+ peer_session->next = plugin->sessions;
+ plugin->sessions = peer_session;
+
+ peer_session->messages = GNUNET_malloc(sizeof(struct MessageQueue));
+ peer_session->messages->msgbuf = GNUNET_malloc(msgbuf_size);
+ memcpy(peer_session->messages->msgbuf, msgbuf, msgbuf_size);
+ peer_session->messages->msgbuf_size = msgbuf_size;
+ peer_session->messages->timeout = GNUNET_TIME_relative_to_absolute(timeout);
+ peer_session->messages->cont = cont;
+ peer_session->messages->cont_cls = cont_cls;
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Other peer is NAT'd, set up peer session for peer %s\n"), GNUNET_i2s(target));
+#endif
+ run_gnunet_nat_client(plugin, addr, addrlen);
+ }
+ else
+ {
+ if (peer_session->expecting_welcome == GNUNET_NO) /* We are "connected" */
+ {
+ sent = udp_real_send(cls, peer_session->sock, target, msgbuf, msgbuf_size, priority, timeout, peer_session->connect_addr, peer_session->connect_alen, cont, cont_cls);
+ }
+ else /* Haven't gotten a response from this peer, queue message */
+ {
+ temp_message = GNUNET_malloc(sizeof(struct MessageQueue));
+ temp_message->msgbuf = GNUNET_malloc(msgbuf_size);
+ memcpy(temp_message->msgbuf, msgbuf, msgbuf_size);
+ temp_message->msgbuf_size = msgbuf_size;
+ temp_message->timeout = GNUNET_TIME_relative_to_absolute(timeout);
+ temp_message->cont = cont;
+ temp_message->cont_cls = cont_cls;
+ temp_message->next = peer_session->messages;
+ peer_session->messages = temp_message;
+ }
+ }
+ }
+ else if (other_peer_natd == GNUNET_NO) /* Other peer not behind a NAT, so we can just send the message as is */
+ {
+ sent = udp_real_send(cls, udp_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
+ }
+ else /* Other peer is NAT'd, but we don't want to play with them (or can't!) */
+ return GNUNET_SYSERR;
+
+ /* When GNUNET_SYSERR is returned from udp_real_send, we will still call
+ * the callback so must not return GNUNET_SYSERR!
+ * If we do, then transport context get freed twice. */
+ if (sent == GNUNET_SYSERR)
+ return 0;
+
+ return sent;
+}
+
+
+static void
+add_to_address_list (struct Plugin *plugin,
+ const void *arg,
+ size_t arg_size)
+{
+ struct LocalAddrList *lal;
+
+ lal = plugin->lal_head;
+ while (NULL != lal)
+ {
+ if ( (lal->size == arg_size) &&
+ (0 == memcmp (&lal[1], arg, arg_size)) )
+ return;
+ lal = lal->next;
+ }
+ lal = GNUNET_malloc (sizeof (struct LocalAddrList) + arg_size);
+ lal->size = arg_size;
+ memcpy (&lal[1], arg, arg_size);
+ GNUNET_CONTAINER_DLL_insert (plugin->lal_head,
+ plugin->lal_tail,
+ lal);
+}
+
+
+static int
+check_local_addr (struct Plugin *plugin,
+ const void *arg,
+ size_t arg_size)
+{
+ struct LocalAddrList *lal;
+
+ lal = plugin->lal_head;
+ while (NULL != lal)
+ {
+ if ( (lal->size == arg_size) &&
+ (0 == memcmp (&lal[1], arg, arg_size)) )
+ return GNUNET_OK;
+ lal = lal->next;
+ }
+ return GNUNET_SYSERR;
+}
+
+
+/**
+ * Add the IP of our network interface to the list of
+ * our external IP addresses.
+ */
+static int
+process_interfaces (void *cls,
+ const char *name,
+ int isDefault,
+ const struct sockaddr *addr, socklen_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ int af;
+ struct IPv4UdpAddress t4;
+ struct IPv6UdpAddress t6;
+ void *arg;
+ uint16_t args;
+ void *addr_nat;
+
+ addr_nat = NULL;
+ af = addr->sa_family;
+ if (af == AF_INET)
+ {
+ t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
+ add_to_address_list (plugin, &t4.ipv4_addr, sizeof (uint32_t));
+ if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
+ {
+ t4.u_port = htons (DEFAULT_NAT_PORT);
+ }
+ else if (plugin->behind_nat == GNUNET_YES) /* We are behind NAT, but will advertise NAT and normal addresses */
+ {
+ addr_nat = GNUNET_malloc(sizeof(t4));
+ memcpy(addr_nat, &t4, sizeof(t4));
+ t4.u_port = plugin->port;
+ ((struct IPv4UdpAddress *)addr_nat)->u_port = htons(DEFAULT_NAT_PORT);
+ }
+ else
+ {
+ t4.u_port = htons(plugin->port);
+ }
+ arg = &t4;
+ args = sizeof (t4);
+ }
+ else if (af == AF_INET6)
+ {
+ if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
+ {
+ /* skip link local addresses */
+ return GNUNET_OK;
+ }
+ memcpy (&t6.ipv6_addr,
+ &((struct sockaddr_in6 *) addr)->sin6_addr,
+ sizeof (struct in6_addr));
+ add_to_address_list (plugin, &t6.ipv6_addr, sizeof (struct in6_addr));
+ if ((plugin->behind_nat == GNUNET_YES) && (plugin->only_nat_addresses == GNUNET_YES))
+ {
+ t6.u6_port = htons (0);
+ }
+ else if (plugin->behind_nat == GNUNET_YES)
+ {
+ addr_nat = GNUNET_malloc(sizeof(t6));
+ memcpy(addr_nat, &t6, sizeof(t6));
+ t6.u6_port = plugin->port;
+ ((struct IPv6UdpAddress *)addr_nat)->u6_port = htons(DEFAULT_NAT_PORT);
+ }
+ else
+ {
+ t6.u6_port = htons (plugin->port);
+ }
+
+ arg = &t6;
+ args = sizeof (t6);
+ }
+ else
+ {
+ GNUNET_break (0);
+ return GNUNET_OK;
+ }
+
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO |
+ GNUNET_ERROR_TYPE_BULK,
+ _("Found address `%s' (%s)\n"),
+ GNUNET_a2s (addr, addrlen), name);
+
+ if (addr_nat != NULL)
+ {
+ plugin->env->notify_address (plugin->env->cls,
+ "udp",
+ addr_nat, args, GNUNET_TIME_UNIT_FOREVER_REL);
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO |
+ GNUNET_ERROR_TYPE_BULK,
+ _("Found NAT address `%s' (%s)\n"),
+ GNUNET_a2s (addr_nat, args), name);
+ GNUNET_free(addr_nat);
+ }
+
+ plugin->env->notify_address (plugin->env->cls,
+ "udp",
+ arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
+ return GNUNET_OK;
+}
+
+
+/**
+ * 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;
+
+ if (addr == NULL)
+ {
+ plugin->hostname_dns = NULL;
+ return;
+ }
+ process_interfaces (plugin, "<hostname>", GNUNET_YES, addr, addrlen);
+}
+
+
+/**
+ * Send UDP probe messages or UDP keepalive messages, depending on the
+ * state of the connection.
+ *
+ * @param cls closure for this call (should be the main Plugin)
+ * @param tc task context for running this
+ */
+static void
+send_udp_probe_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct UDP_NAT_Probes *probe = cls;
+ struct UDP_NAT_ProbeMessage *message;
+ struct Plugin *plugin = probe->plugin;
+
+ message = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessage));
+ message->header.size = htons(sizeof(struct UDP_NAT_ProbeMessage));
+ message->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE);
+ /* If they gave us a port, use that. If not, try our port. */
+ if (ntohs(probe->addr.u_port) == 0)
+ probe->addr.u_port = htons(plugin->port);
+
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Sending a probe to port %d\n"), ntohs(probe->addr.u_port));
+#endif
+
+ probe->count++;
+
+ udp_real_send(plugin, udp_sock.desc, NULL,
+ (char *)message, ntohs(message->header.size), 0,
+ GNUNET_TIME_relative_get_unit(),
+ &probe->addr, sizeof(probe->addr),
+ &udp_probe_continuation, probe);
+
+ GNUNET_free(message);
+}
+
+
+/**
+ * Continuation for probe sends. If the last probe was sent
+ * "successfully", schedule sending of another one. If not,
+ *
+ */
+void
+udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result)
+{
+ struct UDP_NAT_Probes *probe = cls;
+ struct Plugin *plugin = probe->plugin;
+
+ if ((result == GNUNET_OK) && (probe->count < MAX_PROBES))
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Scheduling next probe for 10000 milliseconds\n"));
+#endif
+ probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 10000), &send_udp_probe_message, probe);
+ }
+ else /* Destroy the probe context. */
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Sending probe didn't go well...\n"));
+#endif
+ }
+}
+
+/**
+ * Find probe message by address
+ *
+ * @param plugin the plugin for this transport
+ * @param address_string the ip address as a string
+ */
+struct UDP_NAT_Probes *
+find_probe(struct Plugin *plugin, char * address_string)
+{
+ struct UDP_NAT_Probes *pos;
+
+ pos = plugin->probes;
+ while (pos != NULL)
+ if (strcmp(pos->address_string, address_string) == 0)
+ return pos;
+
+ return pos;
+}
+
+
+/*
+ * @param cls the plugin handle
+ * @param tc the scheduling context (for rescheduling this function again)
+ *
+ * We have been notified that gnunet-nat-server has written something to stdout.
+ * Handle the output, then reschedule this function to be called again once
+ * more is available.
+ *
+ */
+static void
+udp_plugin_server_read (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ struct Plugin *plugin = cls;
+ char mybuf[40];
+ ssize_t bytes;
+ memset(&mybuf, 0, sizeof(mybuf));
+ int i;
+ struct UDP_NAT_Probes *temp_probe;
+ int port;
+ char *port_start;
+ struct IPv4UdpAddress a4;
+
+ if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
+ return;
+
+ bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
+
+ if (bytes < 1)
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Finished reading from server stdout with code: %d\n"), bytes);
+#endif
+ return;
+ }
+
+ port = 0;
+ port_start = NULL;
+ for (i = 0; i < sizeof(mybuf); i++)
+ {
+ if (mybuf[i] == '\n')
+ mybuf[i] = '\0';
+
+ if ((mybuf[i] == ':') && (i + 1 < sizeof(mybuf)))
+ {
+ mybuf[i] = '\0';
+ port_start = &mybuf[i + 1];
+ }
+ }
+
+ if (port_start != NULL)
+ port = atoi(port_start);
+ else
+ {
+ plugin->server_read_task =
+ GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
+ return;
+ }
+
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("nat-server-read read: %s port %d\n"), &mybuf, port);
+#endif
+
+ /**
+ * We have received an ICMP response, ostensibly from a non-NAT'd peer
+ * that wants to connect to us! Send a message to establish a connection.
+ */
+ if (inet_pton(AF_INET, &mybuf[0], &a4.ipv4_addr) != 1)
+ {
+
+ GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp",
+ _("nat-server-read malformed address\n"), &mybuf, port);
+
+ plugin->server_read_task =
+ GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
+ return;
+ }
+
+ temp_probe = find_probe(plugin, &mybuf[0]);
+
+ if (temp_probe == NULL)
+ {
+ temp_probe = GNUNET_malloc(sizeof(struct UDP_NAT_Probes));
+ temp_probe->address_string = strdup(&mybuf[0]);
+ GNUNET_assert (1 == inet_pton(AF_INET, &mybuf[0], &temp_probe->addr.ipv4_addr));
+ temp_probe->addr.u_port = htons(port);
+ temp_probe->next = plugin->probes;
+ temp_probe->plugin = plugin;
+ temp_probe->task = GNUNET_SCHEDULER_add_delayed(plugin->env->sched, GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500), &send_udp_probe_message, temp_probe);
+ plugin->probes = temp_probe;
+ }
+
+ plugin->server_read_task =
+ GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
+
+}
+
+
+/**
+ * Demultiplexer for UDP NAT messages
+ *
+ * @param plugin the main plugin for this transport
+ * @param sender from which peer the message was received
+ * @param currhdr pointer to the header of the message
+ * @param sender_addr the address from which the message was received
+ * @param fromlen the length of the address
+ * @param sockinfo which socket did we receive the message on
*/
+static void
+udp_demultiplexer(struct Plugin *plugin, struct GNUNET_PeerIdentity *sender,
+ const struct GNUNET_MessageHeader *currhdr,
+ const void *sender_addr,
+ size_t fromlen, struct UDP_Sock_Info *sockinfo)
+{
+ struct UDP_NAT_ProbeMessageReply *outgoing_probe_reply;
+ struct UDP_NAT_ProbeMessageConfirmation *outgoing_probe_confirmation;
+
+ char addr_buf[INET_ADDRSTRLEN];
+ struct UDP_NAT_Probes *outgoing_probe;
+ struct PeerSession *peer_session;
+ struct MessageQueue *pending_message;
+ struct MessageQueue *pending_message_temp;
+ uint16_t incoming_port;
+
+ if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Received a message from myself, dropping!!!\n"));
+#endif
+ return;
+ }
+
+ incoming_port = 0;
+ GNUNET_assert(sender_addr != NULL); /* Can recvfrom have a NULL address? */
+ if (fromlen == sizeof(struct IPv4UdpAddress))
+ {
+ incoming_port = ntohs(((struct IPv4UdpAddress *)sender_addr)->u_port);
+ }
+ else if (fromlen == sizeof(struct IPv6UdpAddress))
+ {
+ incoming_port = ntohs(((struct IPv6UdpAddress *)sender_addr)->u6_port);
+ }
+
+ switch (ntohs(currhdr->type))
+ {
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE:
+ /* Send probe reply */
+ outgoing_probe_reply = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageReply));
+ outgoing_probe_reply->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageReply));
+ outgoing_probe_reply->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY);
+
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, incoming_port);
+#endif
+
+ udp_real_send(plugin, sockinfo->desc, NULL,
+ (char *)outgoing_probe_reply,
+ ntohs(outgoing_probe_reply->header.size), 0,
+ GNUNET_TIME_relative_get_unit(),
+ sender_addr, fromlen,
+ NULL, NULL);
+
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Sent PROBE REPLY to port %d on outgoing port %d\n"), incoming_port, sockinfo->port);
+#endif
+ GNUNET_free(outgoing_probe_reply);
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_REPLY:
+ /* Check for existing probe, check ports returned, send confirmation if all is well */
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Received PROBE REPLY from port %d on incoming port %d\n"), incoming_port, sockinfo->port);
+#endif
+ if (sizeof(sender_addr) == sizeof(struct IPv4UdpAddress))
+ {
+ memset(&addr_buf, 0, sizeof(addr_buf));
+ if (NULL == inet_ntop (AF_INET,
+ &((struct IPv4UdpAddress *) sender_addr)->ipv4_addr, addr_buf,
+ INET_ADDRSTRLEN))
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "inet_ntop");
+ return;
+ }
+ outgoing_probe = find_probe(plugin, &addr_buf[0]);
+ if (outgoing_probe != NULL)
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Sending confirmation that we were reached!\n"));
+#endif
+ outgoing_probe_confirmation = GNUNET_malloc(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
+ outgoing_probe_confirmation->header.size = htons(sizeof(struct UDP_NAT_ProbeMessageConfirmation));
+ outgoing_probe_confirmation->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM);
+
+ udp_real_send(plugin, sockinfo->desc, NULL, (char *)outgoing_probe_confirmation, ntohs(outgoing_probe_confirmation->header.size), 0, GNUNET_TIME_relative_get_unit(), sender_addr, fromlen, NULL, NULL);
+
+ if (outgoing_probe->task != GNUNET_SCHEDULER_NO_TASK)
+ {
+ GNUNET_SCHEDULER_cancel(plugin->env->sched, outgoing_probe->task);
+ outgoing_probe->task = GNUNET_SCHEDULER_NO_TASK;
+ /* Schedule task to timeout and remove probe if confirmation not received */
+ }
+ GNUNET_free(outgoing_probe_confirmation);
+ }
+ else
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("Received a probe reply, but have no record of a sent probe!\n"));
+#endif
+ }
+ }
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_CONFIRM:
+ peer_session = find_session(plugin, sender);
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
+#endif
+ if (peer_session == NULL) /* Shouldn't this NOT happen? */
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Peer not in list, adding (THIS MAY BE A MISTAKE) %s\n"), GNUNET_i2s(sender));
+#endif
+ peer_session = GNUNET_malloc(sizeof(struct PeerSession));
+ peer_session->connect_addr = GNUNET_malloc(fromlen);
+ memcpy(peer_session->connect_addr, sender_addr, fromlen);
+ peer_session->connect_alen = fromlen;
+ peer_session->plugin = plugin;
+ peer_session->sock = sockinfo->desc;
+ memcpy(&peer_session->target, sender, sizeof(struct GNUNET_PeerIdentity));
+ peer_session->expecting_welcome = GNUNET_NO;
+
+ peer_session->next = plugin->sessions;
+ plugin->sessions = peer_session;
+
+ peer_session->messages = NULL;
+ }
+ else if (peer_session->expecting_welcome == GNUNET_YES)
+ {
+ peer_session->expecting_welcome = GNUNET_NO;
+ peer_session->sock = sockinfo->desc;
+ if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
+ {
+ ((struct IPv4UdpAddress *)peer_session->connect_addr)->u_port = htons(incoming_port);
+ }
+ else if (peer_session->connect_alen == sizeof(struct IPv4UdpAddress))
+ {
+ ((struct IPv6UdpAddress *)peer_session->connect_addr)->u6_port = htons(incoming_port);
+ }
+
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("Received a probe confirmation, will send to peer on port %d\n"), incoming_port);
+#endif
+ if (peer_session->messages != NULL)
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("Received a probe confirmation, sending queued messages.\n"));
+#endif
+ pending_message = peer_session->messages;
+ int count = 0;
+ while (pending_message != NULL)
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("sending queued message %d\n"), count);
+#endif
+ udp_real_send(plugin,
+ peer_session->sock,
+ &peer_session->target,
+ pending_message->msgbuf,
+ pending_message->msgbuf_size, 0,
+ GNUNET_TIME_relative_get_unit(),
+ peer_session->connect_addr,
+ peer_session->connect_alen,
+ pending_message->cont,
+ pending_message->cont_cls);
-#include "platform.h"
-#include "gnunet_util.h"
-#include "gnunet_protocols.h"
-#include "gnunet_transport.h"
-#include "gnunet_stats_service.h"
-#include "gnunet_upnp_service.h"
-#include "ip.h"
+ pending_message_temp = pending_message;
+ pending_message = pending_message->next;
+ GNUNET_free(pending_message_temp->msgbuf);
+ GNUNET_free(pending_message_temp);
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("finished sending queued message %d\n"), count);
+#endif
+ count++;
+ }
+ }
-#define DEBUG_UDP GNUNET_YES
+ }
+ else
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("Received probe confirmation for already confirmed peer!\n"));
+#endif
+ }
+ /* Received confirmation, add peer with address/port specified */
+ break;
+ case GNUNET_MESSAGE_TYPE_TRANSPORT_UDP_NAT_PROBE_KEEPALIVE:
+ /* Once we've sent NAT_PROBE_CONFIRM change to sending keepalives */
+ /* If we receive these just ignore! */
+ break;
+ default:
+#if DEBUG_UDP
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ _("Sending message type %d to transport!\n"), ntohs(currhdr->type));
+#endif
+ plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
+ NULL, sender_addr, fromlen);
+ }
-/**
- * The default maximum size of each outbound UDP message,
- * optimal value for Ethernet (10 or 100 MBit).
- */
-#define MESSAGE_SIZE 1472
+}
-/**
- * Message-Packet header.
+
+/*
+ * @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. 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.
+ *
*/
-typedef struct
+static void
+udp_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
- /**
- * size of the message, in bytes, including this header.
- */
- GNUNET_MessageHeader header;
+ struct Plugin *plugin = cls;
+ char *buf;
+ struct UDPMessage *msg;
+ struct GNUNET_PeerIdentity *sender;
+ unsigned int buflen;
+ socklen_t fromlen;
+ char addr[32];
+ ssize_t ret;
+ int offset;
+ int count;
+ int tsize;
+ char *msgbuf;
+ const struct GNUNET_MessageHeader *currhdr;
+ struct IPv4UdpAddress t4;
+ struct IPv6UdpAddress t6;
+ const struct sockaddr_in *s4;
+ const struct sockaddr_in6 *s6;
+ const void *ca;
+ size_t calen;
- /**
- * What is the identity of the sender (GNUNET_hash of public key)
- */
- GNUNET_PeerIdentity sender;
-} UDPMessage;
+ plugin->select_task = GNUNET_SCHEDULER_NO_TASK;
-#define MY_TRANSPORT_NAME "UDP"
-#include "common.c"
+ if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
+ return;
-/* *********** globals ************* */
+ buf = NULL;
+ sender = NULL;
+
+ buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
+
+ if (buflen == GNUNET_NO)
+ return;
+
+ buf = GNUNET_malloc (buflen);
+ fromlen = sizeof (addr);
+ memset (&addr, 0, sizeof(addr));
+ ret =
+ GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
+ (struct sockaddr *)&addr, &fromlen);
+
+ if (AF_INET == ((struct sockaddr *)addr)->sa_family)
+ {
+ s4 = (const struct sockaddr_in*) &addr;
+ t4.u_port = s4->sin_port;
+ t4.ipv4_addr = s4->sin_addr.s_addr;
+ ca = &t4;
+ calen = sizeof (t4);
+ }
+ else if (AF_INET6 == ((struct sockaddr *)addr)->sa_family)
+ {
+ s6 = (const struct sockaddr_in6*) &addr;
+ t6.u6_port = s6->sin6_port;
+ memcpy (&t6.ipv6_addr,
+ &s6->sin6_addr,
+ sizeof (struct in6_addr));
+ ca = &t6;
+ calen = sizeof (t6);
+ }
+ else
+ {
+ GNUNET_break (0);
+ ca = NULL;
+ calen = 0;
+ }
-static int stat_bytesReceived;
+ if (ret <= 0)
+ {
+ GNUNET_free (buf);
+ return;
+ }
+ msg = (struct UDPMessage *) buf;
-static int stat_bytesSent;
+ if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
+ {
+ GNUNET_free (buf);
+ return;
+ }
-static int stat_bytesDropped;
+ msgbuf = (char *)&msg[1];
+ sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
+ memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
-static int stat_udpConnected;
+ offset = 0;
+ count = 0;
+ tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
-/**
- * thread that listens for inbound messages
- */
-static struct GNUNET_SelectHandle *selector;
+ while (offset < tsize)
+ {
+ currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
+ udp_demultiplexer(plugin, sender, currhdr, ca, calen, &udp_sock);
+ offset += ntohs(currhdr->size);
+ count++;
+ }
+ GNUNET_free_non_null (buf);
+ GNUNET_free_non_null (sender);
-/**
- * the socket that we transmit all data with
- */
-static struct GNUNET_SocketHandle *udp_sock;
-static struct GNUNET_LoadMonitor *load_monitor;
+ 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);
+}
/**
- * The socket of session has data waiting, process!
+ * Create a slew of UDP sockets. If possible, use IPv6, otherwise
+ * try IPv4.
*
- * This function may only be called if the tcplock is
- * already held by the caller.
+ * @param cls closure for server start, should be a struct Plugin *
+ *
+ * @return number of sockets created or GNUNET_SYSERR on error
*/
static int
-select_message_handler (void *mh_cls,
- struct GNUNET_SelectHandle *sh,
- struct GNUNET_SocketHandle *sock,
- void *sock_ctx, const GNUNET_MessageHeader * msg)
+udp_transport_server_start (void *cls)
{
- unsigned int len;
- GNUNET_TransportPacket *mp;
- const UDPMessage *um;
+ struct Plugin *plugin = cls;
+ struct sockaddr_in serverAddrv4;
+ struct sockaddr_in6 serverAddrv6;
+ struct sockaddr *serverAddr;
+ socklen_t addrlen;
+ int sockets_created;
+
+ sockets_created = 0;
- len = ntohs (msg->size);
- if (len <= sizeof (UDPMessage))
+ if (plugin->behind_nat == GNUNET_YES)
{
- GNUNET_GE_LOG (coreAPI->ectx,
- GNUNET_GE_WARNING | GNUNET_GE_USER | GNUNET_GE_BULK,
- _("Received malformed message via %s. Ignored.\n"),
- "UDP");
- return GNUNET_SYSERR;
+ /* Pipe to read from started processes stdout (on read end) */
+ plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
+ if (plugin->server_stdout == NULL)
+ return sockets_created;
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Starting gnunet-nat-server process cmd: %s %s\n", "gnunet-nat-server", plugin->internal_address);
+#endif
+ /* Start the server process */
+ plugin->server_pid = GNUNET_OS_start_process(NULL, plugin->server_stdout, "gnunet-nat-server", "gnunet-nat-server", plugin->internal_address, NULL);
+ if (plugin->server_pid == GNUNET_SYSERR)
+ {
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Failed to start gnunet-nat-server process\n");
+#endif
+ return GNUNET_SYSERR;
+ }
+ /* Close the write end of the read pipe */
+ GNUNET_DISK_pipe_close_end(plugin->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
+
+ plugin->server_stdout_handle = GNUNET_DISK_pipe_handle(plugin->server_stdout, GNUNET_DISK_PIPE_END_READ);
+ plugin->server_read_task =
+ GNUNET_SCHEDULER_add_read_file (plugin->env->sched,
+ GNUNET_TIME_UNIT_FOREVER_REL,
+ plugin->server_stdout_handle, &udp_plugin_server_read, plugin);
}
- um = (const UDPMessage *) msg;
- mp = GNUNET_malloc (sizeof (GNUNET_TransportPacket));
- mp->msg = GNUNET_malloc (len - sizeof (UDPMessage));
- memcpy (mp->msg, &um[1], len - sizeof (UDPMessage));
- mp->sender = um->sender;
- mp->size = len - sizeof (UDPMessage);
- mp->tsession = NULL;
- coreAPI->receive (mp);
- if (stats != NULL)
- stats->change (stat_bytesReceived, len);
- return GNUNET_OK;
-}
-static void *
-select_accept_handler (void *ah_cls,
- struct GNUNET_SelectHandle *sh,
- struct GNUNET_SocketHandle *sock,
- const void *addr, unsigned int addr_len)
-{
- static int nonnullpointer;
+ udp_sock.desc = NULL;
- if (GNUNET_NO != is_rejected_tester (addr, addr_len))
- return NULL;
- return &nonnullpointer;
+
+ udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
+ if (NULL == udp_sock.desc)
+ {
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
+ return sockets_created;
+ }
+ 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->port);
+ addrlen = sizeof (serverAddrv4);
+ serverAddr = (struct sockaddr *) &serverAddrv4;
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
+#endif
+ while (GNUNET_NETWORK_socket_bind (udp_sock.desc, serverAddr, addrlen) !=
+ GNUNET_OK)
+ {
+ serverAddrv4.sin_port = htons (GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_STRONG, 33537) + 32000); /* Find a good, non-root port */
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Binding failed, trying new port %d\n",
+ ntohs(serverAddrv4.sin_port));
+#endif
+ }
+ udp_sock.port = ntohs(serverAddrv4.sin_port);
+ sockets_created++;
+ }
+
+
+ if ((udp_sock.desc == NULL) && (GNUNET_YES !=
+ GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
+ "DISABLE-IPV6")))
+ {
+ udp_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
+ if (udp_sock.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->port);
+ addrlen = sizeof (serverAddrv6);
+ serverAddr = (struct sockaddr *) &serverAddrv6;
+ sockets_created++;
+ }
+ }
+
+ plugin->rs = GNUNET_NETWORK_fdset_create ();
+
+ GNUNET_NETWORK_fdset_zero (plugin->rs);
+
+
+ GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
+
+ 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);
+
+ return sockets_created;
}
+
+
/**
- * Select has been forced to close a connection.
- * Free the associated context.
+ * 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 void
-select_close_handler (void *ch_cls,
- struct GNUNET_SelectHandle *sh,
- struct GNUNET_SocketHandle *sock, void *sock_ctx)
+static int
+check_port (struct Plugin *plugin, uint16_t in_port)
{
- /* do nothing */
+ if ( (plugin->behind_nat == GNUNET_YES) && (in_port == 0) )
+ return GNUNET_OK;
+ if ( (plugin->only_nat_addresses == GNUNET_YES) &&
+ (plugin->behind_nat == GNUNET_YES) )
+ return GNUNET_SYSERR; /* odd case... */
+ if (in_port == plugin->port)
+ return GNUNET_OK;
+ return GNUNET_SYSERR;
}
+
/**
- * Establish a connection to a remote node.
+ * 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
*
- * @param hello the hello-Message for the target node
- * @param tsessionPtr the session handle that is to be set
- * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
*/
static int
-udp_connect (const GNUNET_MessageHello * hello,
- GNUNET_TSession ** tsessionPtr, int may_reuse)
-{
- GNUNET_TSession *tsession;
-
- tsession = GNUNET_malloc (sizeof (GNUNET_TSession));
- memset (tsession, 0, sizeof (GNUNET_TSession));
- tsession->internal = GNUNET_malloc (GNUNET_sizeof_hello (hello));
- memcpy (tsession->internal, hello, GNUNET_sizeof_hello (hello));
- tsession->ttype = myAPI.protocol_number;
- tsession->peer = hello->senderIdentity;
- *tsessionPtr = tsession;
- if (stats != NULL)
- stats->change (stat_udpConnected, 1);
+udp_check_address (void *cls,
+ const void *addr,
+ size_t addrlen)
+{
+ struct Plugin *plugin = cls;
+ char buf[INET6_ADDRSTRLEN];
+ const void *sb;
+ struct in_addr a4;
+ struct in6_addr a6;
+ int af;
+ uint16_t port;
+ 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->u_port)))
+ return GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ check_local_addr (plugin, &v4->ipv4_addr, sizeof (uint32_t)))
+ return GNUNET_SYSERR;
+
+ af = AF_INET;
+ port = ntohs (v4->u_port);
+ memcpy (&a4, &v4->ipv4_addr, sizeof (a4));
+ sb = &a4;
+ }
+ 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 !=
+ check_local_addr (plugin, &v6->ipv6_addr, sizeof (struct in6_addr)))
+ return GNUNET_SYSERR;
+
+ af = AF_INET6;
+ port = ntohs (v6->u6_port);
+ memcpy (&a6, &v6->ipv6_addr, sizeof (a6));
+ sb = &a6;
+ }
+
+ inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
+
+#if DEBUG_UDP
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Informing transport service about my address `%s:%u'\n",
+ buf,
+ port);
+#endif
return GNUNET_OK;
}
+
/**
- * A (core) Session is to be associated with a transport session. The
- * transport service may want to know in order to call back on the
- * core if the connection is being closed.
- *
- * @param tsession the session handle passed along
- * from the call to receive that was made by the transport
- * layer
- * @return GNUNET_OK if the session could be associated,
- * GNUNET_SYSERR if not.
+ * Append our port and forward the result.
*/
-int
-udp_associate (GNUNET_TSession * tsession)
+static void
+append_port (void *cls, const char *hostname)
{
- return GNUNET_SYSERR; /* UDP connections can never be associated */
+ struct PrettyPrinterContext *ppc = cls;
+ char *ret;
+
+ if (hostname == NULL)
+ {
+ ppc->asc (ppc->asc_cls, NULL);
+ GNUNET_free (ppc);
+ return;
+ }
+ GNUNET_asprintf (&ret, "%s:%d", hostname, ppc->port);
+ ppc->asc (ppc->asc_cls, ret);
+ GNUNET_free (ret);
}
+
/**
- * Disconnect from a remote node.
+ * Convert the transports address to a nice, human-readable
+ * format.
*
- * @param tsession the session that is closed
- * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
+ * @param cls closure
+ * @param type name of the transport that generated the address
+ * @param addr one of the addresses of the host, NULL for the last address
+ * the specific address format depends on the transport
+ * @param addrlen length of the address
+ * @param numeric should (IP) addresses be displayed in numeric form?
+ * @param timeout after how long should we give up?
+ * @param asc function to call on each string
+ * @param asc_cls closure for asc
*/
-static int
-udp_disconnect (GNUNET_TSession * tsession)
+static void
+udp_plugin_address_pretty_printer (void *cls,
+ const char *type,
+ const void *addr,
+ size_t addrlen,
+ int numeric,
+ struct GNUNET_TIME_Relative timeout,
+ GNUNET_TRANSPORT_AddressStringCallback asc,
+ void *asc_cls)
{
- if (tsession != NULL)
+ struct Plugin *plugin = cls;
+ const struct sockaddr_in *v4;
+ const struct sockaddr_in6 *v6;
+ struct PrettyPrinterContext *ppc;
+
+ if ((addrlen != sizeof (struct sockaddr_in)) &&
+ (addrlen != sizeof (struct sockaddr_in6)))
{
- if (tsession->internal != NULL)
- GNUNET_free (tsession->internal);
- GNUNET_free (tsession);
- if (stats != NULL)
- stats->change (stat_udpConnected, -1);
+ /* invalid address */
+ GNUNET_break_op (0);
+ asc (asc_cls, NULL);
+ return;
}
- return GNUNET_OK;
+ ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
+ ppc->asc = asc;
+ ppc->asc_cls = asc_cls;
+ if (addrlen == sizeof (struct sockaddr_in))
+ {
+ v4 = (const struct sockaddr_in *) addr;
+ ppc->port = ntohs (v4->sin_port);
+ }
+ else
+ {
+ v6 = (const struct sockaddr_in6 *) addr;
+ ppc->port = ntohs (v6->sin6_port);
+
+ }
+ GNUNET_RESOLVER_hostname_get (plugin->env->sched,
+ plugin->env->cfg,
+ addr,
+ addrlen,
+ !numeric, timeout, &append_port, ppc);
}
/**
- * Shutdown the server process (stop receiving inbound traffic). Maybe
- * restarted later!
+ * Return the actual path to a file found in the current
+ * PATH environment variable.
+ *
+ * @param binary the name of the file to find
*/
-static int
-udp_transport_server_stop ()
+static char *
+get_path_from_PATH (char *binary)
{
- GNUNET_GE_ASSERT (coreAPI->ectx, udp_sock != NULL);
- if (selector != NULL)
+ char *path;
+ char *pos;
+ char *end;
+ char *buf;
+ const char *p;
+
+ p = getenv ("PATH");
+ if (p == NULL)
+ return NULL;
+ path = GNUNET_strdup (p); /* because we write on it */
+ buf = GNUNET_malloc (strlen (path) + 20);
+ pos = path;
+
+ while (NULL != (end = strchr (pos, ':')))
+ {
+ *end = '\0';
+ sprintf (buf, "%s/%s", pos, binary);
+ if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
+ {
+ GNUNET_free (path);
+ return buf;
+ }
+ pos = end + 1;
+ }
+ sprintf (buf, "%s/%s", pos, binary);
+ if (GNUNET_DISK_file_test (buf) == GNUNET_YES)
{
- GNUNET_select_destroy (selector);
- selector = NULL;
+ GNUNET_free (path);
+ return buf;
}
- GNUNET_socket_destroy (udp_sock);
- udp_sock = NULL;
- return GNUNET_OK;
+ GNUNET_free (buf);
+ GNUNET_free (path);
+ return NULL;
}
/**
- * Test if the transport would even try to send
- * a message of the given size and importance
- * for the given session.<br>
- * This function is used to check if the core should
- * even bother to construct (and encrypt) this kind
- * of message.
+ * Check whether the suid bit is set on a file.
+ * Attempts to find the file using the current
+ * PATH environment variable as a search path.
*
- * @return GNUNET_YES if the transport would try (i.e. queue
- * the message or call the OS to send),
- * GNUNET_NO if the transport would just drop the message,
- * GNUNET_SYSERR if the size/session is invalid
+ * @param binary the name of the file to check
*/
static int
-udp_test_would_try (GNUNET_TSession * tsession, unsigned int size,
- int important)
+check_gnunet_nat_binary(char *binary)
{
- const GNUNET_MessageHello *hello;
+ struct stat statbuf;
+ char *p;
- if (udp_sock == NULL)
- return GNUNET_SYSERR;
- if (size == 0)
- {
- GNUNET_GE_BREAK (coreAPI->ectx, 0);
- return GNUNET_SYSERR;
- }
- if (size > myAPI.mtu)
+ p = get_path_from_PATH (binary);
+ if (p == NULL)
+ return GNUNET_NO;
+ if (0 != STAT (p, &statbuf))
{
- GNUNET_GE_BREAK (coreAPI->ectx, 0);
+ GNUNET_free (p);
return GNUNET_SYSERR;
}
- hello = (const GNUNET_MessageHello *) tsession->internal;
- if (hello == NULL)
- return GNUNET_SYSERR;
- return GNUNET_YES;
+ GNUNET_free (p);
+ if ( (0 != (statbuf.st_mode & S_ISUID)) &&
+ (statbuf.st_uid == 0) )
+ return GNUNET_YES;
+ return GNUNET_NO;
}
/**
- * Create a UDP socket. If possible, use IPv6, otherwise
- * try IPv4. Update available_protocols accordingly.
+ * Function called for a quick conversion of the binary address to
+ * a numeric address. Note that the caller must not free the
+ * address and that the next call to this function is allowed
+ * to override the address again.
+ *
+ * @param cls closure
+ * @param addr binary address
+ * @param addrlen length of the address
+ * @return string representing the same address
*/
-static struct GNUNET_NETWORK_Handle *
-udp_create_socket ()
+static const char*
+udp_address_to_string (void *cls,
+ const void *addr,
+ size_t addrlen)
{
- struct GNUNET_NETWORK_Handle *desc;
+ 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;
- available_protocols = VERSION_AVAILABLE_NONE;
- desc = NULL;
- if (GNUNET_YES !=
- GNUNET_GC_get_configuration_value_yesno (cfg, "GNUNETD", "DISABLE-IPV6",
- GNUNET_YES))
+ if (addrlen == sizeof (struct IPv6UdpAddress))
{
- desc = GNUNET_net_socket (PF_INET6, SOCK_DGRAM, 17);
+ t6 = addr;
+ af = AF_INET6;
+ port = ntohs (t6->u6_port);
+ memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
+ sb = &a6;
}
- if (NULL == desc)
+ else if (addrlen == sizeof (struct IPv4UdpAddress))
{
- desc = GNUNET_net_socket (PF_INET, SOCK_DGRAM, 17);
- if (NULL == desc)
- {
- GNUNET_GE_LOG_STRERROR (coreAPI->ectx,
- GNUNET_GE_ERROR | GNUNET_GE_ADMIN |
- GNUNET_GE_BULK, "socket");
- return GNUNET_SYSERR;
- }
- available_protocols = VERSION_AVAILABLE_IPV4;
+ t4 = addr;
+ af = AF_INET;
+ port = ntohs (t4->u_port);
+ memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
+ sb = &a4;
}
else
- {
- available_protocols = VERSION_AVAILABLE_IPV6 | VERSION_AVAILABLE_IPV4;
- }
- return desc;
+ return NULL;
+ inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
+ GNUNET_snprintf (rbuf,
+ sizeof (rbuf),
+ "%s:%u",
+ buf,
+ port);
+ return rbuf;
}
/**
- * Send a message to the specified remote node.
- *
- * @param tsession the GNUNET_MessageHello identifying the remote node
- * @param message what to send
- * @param size the size of the message
- * @return GNUNET_SYSERR on error, GNUNET_OK on success
+ * The exported method. Makes the core api available via a global and
+ * returns the udp transport API.
*/
-static int
-udp_send (GNUNET_TSession * tsession,
- const void *message, const unsigned int size, int important)
+void *
+libgnunet_plugin_transport_udp_init (void *cls)
{
- const GNUNET_MessageHello *hello;
- const HostAddress *haddr;
- UDPMessage *mp;
- struct sockaddr_in serverAddrv4;
- struct sockaddr_in6 serverAddrv6;
- struct sockaddr *serverAddr;
- socklen_t addrlen;
- unsigned short available;
- int ok;
- int ssize;
- size_t sent;
+ struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
+ unsigned long long mtu;
+ unsigned long long port;
+ struct GNUNET_TRANSPORT_PluginFunctions *api;
+ struct Plugin *plugin;
+ struct GNUNET_SERVICE_Context *service;
+ int sockets_created;
+ int behind_nat;
+ int allow_nat;
+ int only_nat_addresses;
+ char *internal_address;
+ char *external_address;
+ struct IPv4UdpAddress v4_address;
- GNUNET_GE_ASSERT (NULL, tsession != NULL);
- if (udp_sock == NULL)
- return GNUNET_SYSERR;
- if (size == 0)
+ service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
+ if (service == NULL)
{
- GNUNET_GE_BREAK (coreAPI->ectx, 0);
- return GNUNET_SYSERR;
+ GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", _
+ ("Failed to start service for `%s' transport plugin.\n"),
+ "udp");
+ return NULL;
}
- if (size > myAPI.mtu)
+
+ if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
+ "transport-udp",
+ "BEHIND_NAT"))
{
- GNUNET_GE_BREAK (coreAPI->ectx, 0);
- return GNUNET_SYSERR;
+ /* We are behind nat (according to the user) */
+ if (check_gnunet_nat_binary("gnunet-nat-server") == GNUNET_YES)
+ behind_nat = GNUNET_YES;
+ else
+ {
+ behind_nat = GNUNET_NO;
+ GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", "Configuration specified you are behind a NAT, but gnunet-nat-server is not installed properly (suid bit not set)!\n");
+ }
}
- hello = (const GNUNET_MessageHello *) tsession->internal;
- if (hello == NULL)
- return GNUNET_SYSERR;
+ else
+ behind_nat = GNUNET_NO; /* We are not behind nat! */
- haddr = (const HostAddress *) &hello[1];
- available = ntohs (haddr->availability) & available_protocols;
- if (available == VERSION_AVAILABLE_NONE)
- return GNUNET_SYSERR;
- if (available == (VERSION_AVAILABLE_IPV4 | VERSION_AVAILABLE_IPV6))
+ if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
+ "transport-udp",
+ "ALLOW_NAT"))
{
- if (GNUNET_random_u32 (GNUNET_RANDOM_QUALITY_WEAK, 2) == 0)
- available = VERSION_AVAILABLE_IPV4;
+ if (check_gnunet_nat_binary("gnunet-nat-client") == GNUNET_YES)
+ allow_nat = GNUNET_YES; /* We will try to connect to NAT'd peers */
else
- available = VERSION_AVAILABLE_IPV6;
+ {
+ allow_nat = GNUNET_NO;
+ GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp", "Configuration specified you want to connect to NAT'd peers, but gnunet-nat-client is not installed properly (suid bit not set)!\n");
+ }
+
+ }
+ else
+ allow_nat = GNUNET_NO; /* We don't want to try to help NAT'd peers */
+
+ if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
+ "transport-udp",
+ "ONLY_NAT_ADDRESSES"))
+ only_nat_addresses = GNUNET_YES; /* We will only report our addresses as NAT'd */
+ else
+ only_nat_addresses = GNUNET_NO; /* We will report our addresses as NAT'd and non-NAT'd */
+
+ external_address = NULL;
+ if (((GNUNET_YES == behind_nat) || (GNUNET_YES == allow_nat)) && (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (env->cfg,
+ "transport-udp",
+ "EXTERNAL_ADDRESS",
+ &external_address)))
+ {
+ GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
+ "udp",
+ _
+ ("Require EXTERNAL_ADDRESS for service `%s' in configuration (either BEHIND_NAT or ALLOW_NAT set to YES)!\n"),
+ "transport-udp");
+ GNUNET_SERVICE_stop (service);
+ return NULL;
}
- ssize = size + sizeof (UDPMessage);
- mp = GNUNET_malloc (ssize);
- mp->header.size = htons (ssize);
- mp->header.type = 0;
- mp->sender = *(coreAPI->my_identity);
- memcpy (&mp[1], message, size);
- ok = GNUNET_SYSERR;
- if ((available & VERSION_AVAILABLE_IPV4) > 0)
+ if ((external_address != NULL) && (inet_pton(AF_INET, external_address, &v4_address.ipv4_addr) != 1))
{
- memset (&serverAddrv4, 0, sizeof (serverAddrv4));
- serverAddrv4.sin_family = AF_INET;
- serverAddrv4.sin_port = haddr->port;
- memcpy (&serverAddrv4.sin_addr, &haddr->ipv4, sizeof (struct in_addr));
- addrlen = sizeof (serverAddrv4);
- serverAddr = (struct sockaddr *) &serverAddrv4;
+ GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed EXTERNAL_ADDRESS %s given in configuration!\n", external_address);
}
- else
+
+ internal_address = NULL;
+ if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (env->cfg,
+ "transport-udp",
+ "INTERNAL_ADDRESS",
+ &internal_address)))
{
- memset (&serverAddrv6, 0, sizeof (serverAddrv6));
- serverAddrv6.sin6_family = AF_INET;
- serverAddrv6.sin6_port = haddr->port;
- memcpy (&serverAddrv6.sin6_addr, &haddr->ipv6,
- sizeof (struct in6_addr));
- addrlen = sizeof (serverAddrv6);
- serverAddr = (struct sockaddr *) &serverAddrv6;
- }
-#ifndef MINGW
- if (GNUNET_YES == GNUNET_socket_send_to (udp_sock,
- GNUNET_NC_NONBLOCKING,
- mp,
- ssize, &sent,
- (const char *) serverAddr,
- addrlen))
-#else
- sent =
- win_ols_sendto (udp_sock, mp, ssize, (const char *) serverAddr, addrlen);
- if (sent != SOCKET_ERROR)
-#endif
+ GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
+ "udp",
+ _
+ ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
+ "transport-udp");
+ GNUNET_SERVICE_stop (service);
+ GNUNET_free_non_null(external_address);
+ return NULL;
+ }
+
+ if ((internal_address != NULL) && (inet_pton(AF_INET, internal_address, &v4_address.ipv4_addr) != 1))
{
- ok = GNUNET_OK;
- if (stats != NULL)
- stats->change (stat_bytesSent, sent);
+ GNUNET_log_from(GNUNET_ERROR_TYPE_WARNING, "udp", "Malformed INTERNAL_ADDRESS %s given in configuration!\n", internal_address);
}
- else
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg,
+ "transport-udp",
+ "PORT",
+ &port))
+ port = UDP_NAT_DEFAULT_PORT;
+ else if (port > 65535)
{
- if (stats != NULL)
- stats->change (stat_bytesDropped, ssize);
+ GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
+ "udp",
+ _("Given `%s' option is out of range: %llu > %u\n"),
+ "PORT",
+ port,
+ 65535);
+ GNUNET_SERVICE_stop (service);
+ GNUNET_free_non_null(external_address);
+ GNUNET_free_non_null(internal_address);
+ return NULL;
}
- GNUNET_free (mp);
- return ok;
-}
-/**
- * Start the server process to receive inbound traffic.
- *
- * @return GNUNET_OK on success, GNUNET_SYSERR if the operation failed
- */
-static int
-udp_transport_server_start ()
-{
- struct sockaddr_in serverAddrv4;
- struct sockaddr_in6 serverAddrv6;
- struct sockaddr *serverAddr;
- socklen_t addrlen;
- GNUNET_NETWORK_Handle *desc;
- const int on = 1;
- unsigned short port;
-
- GNUNET_GE_ASSERT (coreAPI->ectx, selector == NULL);
- /* initialize UDP network */
- port = get_port ();
- if (port != 0)
- {
- desc = udp_create_socket ();
- if (NULL == desc)
- return GNUNET_SYSERR;
- if (GNUNET_net_setsockopt (desc, SOL_SOCKET, SO_REUSEADDR, &on, sizeof (on)) < 0)
- {
- GNUNET_GE_DIE_STRERROR (coreAPI->ectx,
- GNUNET_GE_FATAL | GNUNET_GE_ADMIN |
- GNUNET_GE_IMMEDIATE, "setsockopt");
- return GNUNET_SYSERR;
- }
- if (available_protocols == VERSION_AVAILABLE_IPV4)
- {
- memset (&serverAddrv4, 0, sizeof (serverAddrv4));
- serverAddrv4.sin_family = AF_INET;
- serverAddrv4.sin_addr.s_addr = INADDR_ANY;
- serverAddrv4.sin_port = htons (port);
- addrlen = sizeof (serverAddrv4);
- serverAddr = (struct sockaddr *) &serverAddrv4;
- }
- else
- {
- memset (&serverAddrv6, 0, sizeof (serverAddrv6));
- serverAddrv6.sin6_family = AF_INET6;
- serverAddrv6.sin6_addr = in6addr_any;
- serverAddrv6.sin6_port = htons (port);
- addrlen = sizeof (serverAddrv6);
- serverAddr = (struct sockaddr *) &serverAddrv6;
- }
- if (GNUNET_net_bind (desc, serverAddr, addrlen) < 0)
- {
- GNUNET_GE_LOG_STRERROR (coreAPI->ectx,
- GNUNET_GE_FATAL | GNUNET_GE_ADMIN |
- GNUNET_GE_IMMEDIATE, "bind");
- GNUNET_GE_LOG (coreAPI->ectx,
- GNUNET_GE_FATAL | GNUNET_GE_ADMIN |
- GNUNET_GE_IMMEDIATE,
- _("Failed to bind to %s port %d.\n"),
- MY_TRANSPORT_NAME, port);
- if (0 != GNUNET_net_close (&desc))
- GNUNET_GE_LOG_STRERROR (coreAPI->ectx,
- GNUNET_GE_ERROR | GNUNET_GE_USER |
- GNUNET_GE_ADMIN | GNUNET_GE_BULK,
- "close");
- return GNUNET_SYSERR;
- }
- selector = GNUNET_select_create ("udp", GNUNET_YES, coreAPI->ectx, load_monitor, desc, addrlen, 0, /* timeout */
- &select_message_handler,
- NULL,
- &select_accept_handler,
- NULL,
- &select_close_handler,
- NULL, 64 * 1024,
- 16 /* max sockets */ );
- if (selector == NULL)
- return GNUNET_SYSERR;
- }
- desc = udp_create_socket ();
- if (NULL == desc)
- {
- GNUNET_GE_LOG_STRERROR (coreAPI->ectx,
- GNUNET_GE_ERROR | GNUNET_GE_ADMIN |
- GNUNET_GE_BULK, "socket");
- GNUNET_select_destroy (selector);
- selector = NULL;
- return GNUNET_SYSERR;
+ 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->external_address = external_address;
+ plugin->internal_address = internal_address;
+ plugin->port = port;
+ plugin->behind_nat = behind_nat;
+ plugin->allow_nat = allow_nat;
+ plugin->only_nat_addresses = only_nat_addresses;
+ plugin->env = env;
+
+ api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
+ api->cls = plugin;
+
+ api->send = &udp_plugin_send;
+ api->disconnect = &udp_disconnect;
+ api->address_pretty_printer = &udp_plugin_address_pretty_printer;
+ api->address_to_string = &udp_address_to_string;
+ api->check_address = &udp_check_address;
+
+ plugin->service = service;
+
+ if (plugin->behind_nat == GNUNET_NO)
+ {
+ GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
}
- udp_sock = GNUNET_socket_create (coreAPI->ectx, load_monitor, desc);
- GNUNET_GE_ASSERT (coreAPI->ectx, udp_sock != NULL);
- return GNUNET_OK;
-}
-/**
- * The exported method. Makes the core api available via a global and
- * returns the udp transport API.
- */
-GNUNET_TransportAPI *
-inittransport_udp (GNUNET_CoreAPIForTransport * core)
-{
- unsigned long long mtu;
+ plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
+ env->cfg,
+ AF_UNSPEC,
+ HOSTNAME_RESOLVE_TIMEOUT,
+ &process_hostname_ips,
+ plugin);
- cfg = core->cfg;
- load_monitor = core->load_monitor;
- GNUNET_GE_ASSERT (coreAPI->ectx, sizeof (UDPMessage) == 68);
- GNUNET_GE_ASSERT (coreAPI->ectx, sizeof (HostAddress) == 24);
- coreAPI = core;
- if (-1 == GNUNET_GC_get_configuration_value_number (cfg,
- "UDP",
- "MTU",
- sizeof (UDPMessage)
- +
- GNUNET_P2P_MESSAGE_OVERHEAD
- +
- sizeof
- (GNUNET_MessageHeader) +
- 32, 65500,
- MESSAGE_SIZE, &mtu))
+ if ((plugin->behind_nat == GNUNET_YES) && (inet_pton(AF_INET, plugin->external_address, &v4_address.ipv4_addr) == 1))
{
- return NULL;
+ v4_address.u_port = htons(0);
+ plugin->env->notify_address (plugin->env->cls,
+ "udp",
+ &v4_address, sizeof(v4_address), GNUNET_TIME_UNIT_FOREVER_REL);
}
- if (mtu < 1200)
- GNUNET_GE_LOG (coreAPI->ectx,
- GNUNET_GE_ERROR | GNUNET_GE_USER | GNUNET_GE_IMMEDIATE,
- _("MTU %llu for `%s' is probably too low!\n"), mtu, "UDP");
- lock = GNUNET_mutex_create (GNUNET_NO);
- if (0 !=
- GNUNET_GC_attach_change_listener (cfg, &reload_configuration, NULL))
- {
- GNUNET_mutex_destroy (lock);
- lock = NULL;
- return NULL;
+ else if ((plugin->external_address != NULL) && (inet_pton(AF_INET, plugin->external_address, &v4_address.ipv4_addr) == 1))
+ {
+ v4_address.u_port = htons(plugin->port);
+ plugin->env->notify_address (plugin->env->cls,
+ "udp",
+ &v4_address, sizeof(v4_address), GNUNET_TIME_UNIT_FOREVER_REL);
}
- if (GNUNET_GC_get_configuration_value_yesno (cfg, "UDP", "UPNP", GNUNET_YES)
- == GNUNET_YES)
- {
- upnp = coreAPI->service_request ("upnp");
- if (upnp == NULL)
- GNUNET_GE_LOG (coreAPI->ectx,
- GNUNET_GE_ERROR | GNUNET_GE_USER | GNUNET_GE_IMMEDIATE,
- "The UPnP service could not be loaded. To disable UPnP, set the "
- "configuration option \"UPNP\" in section \"%s\" to \"NO\"\n",
- "UDP");
- }
- stats = coreAPI->service_request ("stats");
- if (stats != NULL)
- {
- stat_bytesReceived
- = stats->create (gettext_noop ("# bytes received via UDP"));
- stat_bytesSent = stats->create (gettext_noop ("# bytes sent via UDP"));
- stat_bytesDropped
- = stats->create (gettext_noop ("# bytes dropped by UDP (outgoing)"));
- stat_udpConnected
- = stats->create (gettext_noop ("# UDP connections (right now)"));
- }
- myAPI.protocol_number = GNUNET_TRANSPORT_PROTOCOL_NUMBER_UDP;
- myAPI.mtu = mtu - sizeof (UDPMessage);
- myAPI.cost = 20000;
- myAPI.hello_verify = &verify_hello;
- myAPI.hello_create = &create_hello;
- myAPI.connect = &udp_connect;
- myAPI.send = &udp_send;
- myAPI.associate = &udp_associate;
- myAPI.disconnect = &udp_disconnect;
- myAPI.server_start = &udp_transport_server_start;
- myAPI.server_stop = &udp_transport_server_stop;
- myAPI.hello_to_address = &hello_to_address;
- myAPI.send_now_test = &udp_test_would_try;
-
- return &myAPI;
+
+ sockets_created = udp_transport_server_start (plugin);
+
+ GNUNET_assert (sockets_created == 1);
+
+ return api;
}
-void
-donetransport_udp ()
+void *
+libgnunet_plugin_transport_udp_done (void *cls)
{
- do_shutdown ();
+ struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
+ struct Plugin *plugin = api->cls;
+ struct LocalAddrList *lal;
+
+ udp_transport_server_stop (plugin);
+ if (NULL != plugin->hostname_dns)
+ {
+ GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
+ plugin->hostname_dns = NULL;
+ }
+
+ GNUNET_SERVICE_stop (plugin->service);
+
+ GNUNET_NETWORK_fdset_destroy (plugin->rs);
+ while (NULL != (lal = plugin->lal_head))
+ {
+ GNUNET_CONTAINER_DLL_remove (plugin->lal_head,
+ plugin->lal_tail,
+ lal);
+ GNUNET_free (lal);
+ }
+ GNUNET_free (plugin);
+ GNUNET_free (api);
+ return NULL;
}
-/* end of udp.c */
+/* end of plugin_transport_udp.c */
projects / oweals / gnunet.git / blobdiff