/**
* @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 "plugin_transport.h"
#include "transport.h"
-#define DEBUG_UDP GNUNET_NO
+#define DEBUG_UDP GNUNET_YES
-/**
+#define MAX_PROBES 20
+
+/*
* Transport cost to peer, always 1 for UDP (direct connection)
*/
#define UDP_DIRECT_DISTANCE 1
+/**
+ * Handle for request of hostname resolution, non-NULL if pending.
+ */
+static struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
+
/**
* 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
/**
- * Message-Packet header.
+ * UDP Message-Packet header.
*/
struct UDPMessage
{
/**
- * size of the message, in bytes, including this header.
+ * Message header.
*/
struct GNUNET_MessageHeader header;
};
-/**
- * Network format for IPv4 addresses.
- */
-struct IPv4UdpAddress
+/* Forward definition */
+struct Plugin;
+
+struct PrettyPrinterContext
+{
+ GNUNET_TRANSPORT_AddressStringCallback asc;
+ void *asc_cls;
+ uint16_t port;
+};
+
+struct MessageQueue
{
/**
- * IPv4 address, in network byte order.
+ * 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
*/
- uint32_t ipv4_addr;
+ size_t msgbuf_size;
/**
- * Port number, in network byte order.
+ * When to discard this message
*/
- uint16_t u_port;
+ 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;
+
+};
/**
- * Network format for IPv6 addresses.
+ * UDP NAT Probe message reply definition
*/
-struct IPv6UdpAddress
+struct UDP_NAT_ProbeMessageReply
{
/**
- * IPv6 address.
+ * Message header
*/
- struct in6_addr ipv6_addr;
+ struct GNUNET_MessageHeader header;
+
+};
+
+/**
+ * UDP NAT Probe message confirm definition
+ */
+struct UDP_NAT_ProbeMessageConfirmation
+{
/**
- * Port number, in network byte order.
+ * Message header
*/
- uint16_t u6_port;
+ struct GNUNET_MessageHeader header;
};
+
/**
- *
+ * UDP NAT "Session"
*/
-struct PrettyPrinterContext
+struct PeerSession
{
+
/**
- *
+ * Stored in a linked list.
*/
- GNUNET_TRANSPORT_AddressStringCallback asc;
+ struct PeerSession *next;
/**
- * Closure for 'asc'.
+ * Pointer to the global plugin struct.
*/
- void *asc_cls;
+ struct Plugin *plugin;
/**
- *
+ * To whom are we talking to (set to our identity
+ * if we are still waiting for the welcome message)
*/
- uint16_t port;
+ 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 sockaddr_in sock_addr;
+
+ /**
+ * The port to send this probe to, 0 to choose randomly
+ */
+ int port;
+
};
*/
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;
+
+ /*
* 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 task used to update our addresses when one expires.
+ * ID of select gnunet-nat-server stdout read task
*/
- GNUNET_SCHEDULER_TaskIdentifier address_update_task;
+ GNUNET_SCHEDULER_TaskIdentifier server_read_task;
/**
- * ID of select task
+ * Is this transport configured to be behind a NAT?
*/
- GNUNET_SCHEDULER_TaskIdentifier select_task;
+ int behind_nat;
/**
- * Port that we are actually listening on.
+ * The process id of the server process (if behind NAT)
*/
- uint16_t open_port;
+ pid_t server_pid;
/**
- * Port that the user said we would have visible to the
- * rest of the world.
+ * Probes in flight
*/
- uint16_t adv_port;
+ 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
+ * the socket that we transmit all data with
+ */
+static struct UDP_Sock_Info udp_sock;
+
+
+/**
+ * Forward declaration.
*/
-static struct GNUNET_NETWORK_Handle *udp_sock;
+void
+udp_probe_continuation (void *cls, const struct GNUNET_PeerIdentity *target, int result);
+
/**
- * Disconnect from a remote node.
+ * Disconnect from a remote node. Clean up session if we have one for this peer
*
- * @param cls closure ('struct Plugin'), unused
- * @param target peer do disconnect
+ * @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)
+udp_disconnect (void *cls, const struct GNUNET_PeerIdentity *target)
{
- /* nothing to do, UDP is stateless */
+ /** TODO: Implement! */
+ return;
}
/**
* Shutdown the server process (stop receiving inbound traffic). Maybe
* restarted later!
*
- * @param cls closure, the 'struct Plugin*'
+ * @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;
- GNUNET_assert (udp_sock != NULL);
+ 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;
}
- ret = GNUNET_NETWORK_socket_close (udp_sock);
- if (ret != GNUNET_SYSERR)
- udp_sock = NULL;
+
+ 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;
+}
+
+
/**
- * Function that can be used by the transport service to transmit
- * a message using the plugin.
+ * Actually send out the message, assume we've got the address and
+ * send_handle squared away!
*
- * @param cls closure, the 'struct Plugin*'
+ * @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 session which session must be used (always NULL for UDP)
* @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 GNUNET_YES if the plugin MUST use the given address,
- * GNUNET_NO means the plugin may use any other address and
- * GNUNET_SYSERR means that only reliable existing
- * bi-directional connections should be used (regardless
- * of address)
* @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, -1 on error (in this case, cont is not called)
+ * @return the number of bytes written
*/
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)
+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;
- const void *sb;
- size_t sbs;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4UdpAddress *t4;
- const struct IPv6UdpAddress *t6;
- GNUNET_assert (NULL == session);
- GNUNET_assert(udp_sock != NULL);
- if ( (addr == NULL) || (addrlen == 0) )
+ if ((addr == NULL) || (addrlen == 0))
{
-#if DEBUG_UDP
+#if DEBUG_UDP_NAT
GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
("udp_plugin_send called without address, returning!\n"));
#endif
- return -1; /* Can never send if we don't have an address!! */
- }
- if (force_address == GNUNET_SYSERR)
- return -1; /* never reliable */
-
- 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);
- return -1;
+ 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;
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
- "In udp_send, ssize is %d, sending message to `%s'\n",
- ssize,
- GNUNET_a2s(sb, sbs));
-#endif
message->header.size = htons (ssize);
message->header.type = htons (0);
memcpy (&message->sender, plugin->env->my_identity,
sizeof (struct GNUNET_PeerIdentity));
memcpy (&message[1], msgbuf, msgbuf_size);
+
+ /* Actually send the message */
sent =
- GNUNET_NETWORK_socket_sendto (udp_sock, message, ssize,
- sb, sbs);
- if ( (cont != NULL) &&
- (sent != -1) )
- cont (cont_cls, target, GNUNET_OK);
+ GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
+ addr,
+ addrlen);
+
+ 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 inet4[INET_ADDRSTRLEN];
+ char *address_as_string;
+ char *port_as_string;
+ pid_t pid;
+ const struct sockaddr *sa = (const struct sockaddr *)addr;
+
+ if (addrlen < sizeof (struct sockaddr))
+ return;
+ switch (sa->sa_family)
+ {
+ case AF_INET:
+ if (addrlen != sizeof (struct sockaddr_in))
+ return;
+ inet_ntop (AF_INET,
+ &((struct sockaddr_in *) sa)->sin_addr,
+ inet4, INET_ADDRSTRLEN);
+ address_as_string = GNUNET_strdup (inet4);
+ break;
+ case AF_INET6:
+ default:
+ return;
+ }
+
+ GNUNET_asprintf(&port_as_string, "%d", plugin->port);
+#if DEBUG_UDP_NAT
+ 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;
+ struct sockaddr_in *sockaddr = (struct sockaddr_in *)addr;
+ int other_peer_natd;
+
+ GNUNET_assert (NULL == session);
+ other_peer_natd = GNUNET_NO;
+ if ((sockaddr->sin_family == AF_INET) && (ntohs(sockaddr->sin_port) == 0))
+ {
+ other_peer_natd = GNUNET_YES;
+ }
+
+ sent = 0;
+
+ if (other_peer_natd == 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->next = NULL;
+ 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_NAT
+ 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 /* 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);
+ }
+
+ if (sent == GNUNET_SYSERR)
+ return 0;
+
+ return sent;
+}
+
/**
* Add the IP of our network interface to the list of
* our external IP addresses.
- *
- * @param cls closure (the 'struct Plugin*')
- * @param name name of the interface (can be NULL for unknown)
- * @param isDefault is this presumably the default interface
- * @param addr address of this interface (can be NULL for unknown or unassigned)
- * @param addrlen length of the address
- * @return GNUNET_OK to continue iterating
*/
static int
process_interfaces (void *cls,
{
struct Plugin *plugin = cls;
int af;
- struct IPv4UdpAddress t4;
- struct IPv6UdpAddress t6;
- void *arg;
- uint16_t args;
+ struct sockaddr_in *v4;
+ struct sockaddr_in6 *v6;
af = addr->sa_family;
if (af == AF_INET)
{
- t4.ipv4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
- t4.u_port = htons (plugin->adv_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));
- t6.u6_port = htons (plugin->adv_port);
- arg = &t6;
- args = sizeof (t6);
+ v4 = (struct sockaddr_in *) addr;
+ if (plugin->behind_nat == GNUNET_YES)
+ {
+ GNUNET_assert(inet_pton(AF_INET, plugin->external_address, &v4->sin_addr) == GNUNET_OK);
+ v4->sin_port = htons (0); /* Indicates to receiver we are behind NAT */
+ }
+ else
+ v4->sin_port = htons (plugin->port);
}
else
{
- GNUNET_break (0);
- return GNUNET_OK;
- }
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
- GNUNET_ERROR_TYPE_BULK,
- "udp",
- _("Found address `%s' (%s)\n"),
- GNUNET_a2s (addr, addrlen),
- name);
- plugin->env->notify_address (plugin->env->cls,
- "udp",
- arg, args, GNUNET_TIME_UNIT_FOREVER_REL);
+ GNUNET_assert (af == AF_INET6);
+ v6 = (struct sockaddr_in6 *) addr;
+ if (plugin->behind_nat == GNUNET_YES)
+ v6->sin6_port = htons (0);
+ else
+ v6->sin6_port = htons (plugin->port);
+ }
+
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
+ GNUNET_ERROR_TYPE_BULK,
+ "udp", _("Found address `%s' (%s)\n"),
+ GNUNET_a2s (addr, addrlen), name);
+ plugin->env->notify_address (plugin->env->cls,
+ "udp",
+ addr, addrlen, GNUNET_TIME_UNIT_FOREVER_REL);
+
return GNUNET_OK;
}
}
+/**
+ * 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 (probe->port != 0)
+ probe->sock_addr.sin_port = htons(probe->port);
+ else
+ probe->sock_addr.sin_port = htons(plugin->port);
+
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_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->sock_addr, sizeof(probe->sock_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_NAT
+ 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_NAT
+ 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 our writeset has something to read. Presumably
- * select has been called already, so we can go ahead and start reading from
- * the socket immediately. Then we check if there is more to be read by
- * calling select ourselves while there is stuff on the wire. Then reschedule
- * this function to be called again once more is available.
+ * 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;
+ bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
+
+ if (bytes < 1)
+ {
+#if DEBUG_UDP_NAT
+ 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);
+
+#if DEBUG_UDP_NAT
+ 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.
+ */
+ 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]);
+ temp_probe->sock_addr.sin_family = AF_INET;
+ GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
+ temp_probe->port = 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, struct sockaddr_storage *sender_addr, socklen_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;
+
+ if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
+ {
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Received a message from myself, dropping!!!\n"));
+#endif
+ return;
+ }
+
+ 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_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_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_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_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_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp",
+ _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
+#endif
+ /* FIXME: use nonce, then IPv6 replies could work I think... */
+ if (sender_addr->ss_family == AF_INET)
+ {
+ memset(&addr_buf, 0, sizeof(addr_buf));
+ inet_ntop(AF_INET, &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf, INET_ADDRSTRLEN);
+ outgoing_probe = find_probe(plugin, &addr_buf[0]);
+ if (outgoing_probe != NULL)
+ {
+#if DEBUG_UDP_NAT
+ 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_NAT
+ 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_NAT
+ 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_NAT
+ 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;
+ /* FIXME: There is no way to find this based on receiving port at the moment! */
+ peer_session->sock = sockinfo->desc; /* This may matter, not sure right now... */
+ ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
+#endif
+ if (peer_session->messages != NULL)
+ {
+#if DEBUG_UDP_NAT
+ 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_NAT
+ 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);
+ pending_message_temp = pending_message;
+ pending_message = pending_message->next;
+ GNUNET_free(pending_message_temp->msgbuf);
+ GNUNET_free(pending_message_temp);
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp",
+ _("finished sending queued message %d\n"), count);
+#endif
+ count++;
+ }
+ }
+
+ }
+ else
+ {
+#if DEBUG_UDP_NAT
+ 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:
+ plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
+ NULL, (char *)sender_addr, fromlen);
+ }
+
+}
+
+
+/*
+ * @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.
*
*/
static void
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;
-
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("entered select...\n"));
-#endif
- buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock);
+ buf = NULL;
+ sender = NULL;
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("we expect to read %u bytes\n"), buflen);
-#endif
+ buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_sock.desc);
- if (buflen == GNUNET_NO)
- return;
+ if (buflen == GNUNET_NO)
+ return;
+
+ buf = GNUNET_malloc (buflen);
+ fromlen = sizeof (addr);
+ memset (&addr, 0, fromlen);
+ ret =
+ GNUNET_NETWORK_socket_recvfrom (udp_sock.desc, buf, buflen,
+ (struct sockaddr *) &addr, &fromlen);
- buf = GNUNET_malloc (buflen);
- fromlen = sizeof (addr);
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
+ ("socket_recv returned %u, src_addr_len is %u\n"), ret,
+ fromlen);
+#endif
- memset (&addr, 0, fromlen);
- ret =
- GNUNET_NETWORK_socket_recvfrom (udp_sock, buf, buflen,
- (struct sockaddr *) &addr, &fromlen);
+ if (ret <= 0)
+ {
+ GNUNET_free (buf);
+ return;
+ }
+ msg = (struct UDPMessage *) buf;
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("socket_recv returned %u, src_addr_len is %u\n"), ret,
- fromlen);
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
+ ("header reports message size of %d, type %d\n"),
+ ntohs (msg->header.size), ntohs (msg->header.type));
#endif
+ if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
+ {
+ GNUNET_free (buf);
+ return;
+ }
- if (ret <= 0)
- {
- GNUNET_free (buf);
- return;
- }
- msg = (struct UDPMessage *) buf;
+ msgbuf = (char *)&msg[1];
+ sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
+ memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("header reports message size of %d\n"),
- ntohs (msg->header.size));
+ offset = 0;
+ count = 0;
+ tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("header reports message type of %d\n"),
- ntohs (msg->header.type));
+ while (offset < tsize)
+ {
+ currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
+ ("processing msg %d: type %d, size %d at offset %d\n"),
+ count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
#endif
- if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
- {
- GNUNET_free (buf);
- GNUNET_NETWORK_fdset_zero (plugin->rs);
- GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock);
- return;
- }
- msgbuf = (char *)&msg[1];
- sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
- memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
-
- offset = 0;
- count = 0;
- tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "UDP", _
- ("offset is %d, tsize is %d (UDPMessage size is %d)\n"),
- offset, tsize, sizeof(struct UDPMessage));
+ udp_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_sock);
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
+ ("processing done msg %d: type %d, size %d at offset %d\n"),
+ count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
#endif
+ offset += ntohs(currhdr->size);
+ count++;
+ }
+ GNUNET_free_non_null (buf);
+ GNUNET_free_non_null (sender);
- if (fromlen == sizeof (struct sockaddr_in))
- {
- s4 = (const struct sockaddr_in*) &addr;
- t4.u_port = s4->sin_port;
- t4.ipv4_addr = s4->sin_addr.s_addr;
- ca = &t4;
- calen = sizeof (struct IPv4UdpAddress);
- }
- else if (fromlen == sizeof (struct sockaddr_in6))
- {
- 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 (struct IPv6UdpAddress);
- }
- else
- {
- GNUNET_break (0);
- ca = NULL;
- calen = 0;
- }
- while (offset < tsize)
- {
- currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("processing msg %d: type %d, size %d at offset %d\n"),
- count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
-#endif
- plugin->env->receive (plugin->env->cls,
- sender, currhdr, UDP_DIRECT_DISTANCE,
- NULL, ca, calen);
- offset += ntohs(currhdr->size);
-#if DEBUG_UDP
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("offset now %d, tsize %d\n"),
- offset, tsize);
-#endif
- count++;
- }
-
- GNUNET_free (sender);
- GNUNET_free (buf);
plugin->select_task =
GNUNET_SCHEDULER_add_select (plugin->env->sched,
}
/**
- * Create a UDP socket. If possible, use IPv6, otherwise
+ * Create a slew of UDP sockets. If possible, use IPv6, otherwise
* try IPv4.
- * @param cls closure, the 'struct Plugin*'
+ *
+ * @param cls closure for server start, should be a struct Plugin *
+ *
+ * @return number of sockets created or GNUNET_SYSERR on error
*/
-static struct GNUNET_NETWORK_Handle *
+static int
udp_transport_server_start (void *cls)
{
struct Plugin *plugin = cls;
- struct GNUNET_NETWORK_Handle *desc;
struct sockaddr_in serverAddrv4;
struct sockaddr_in6 serverAddrv6;
struct sockaddr *serverAddr;
socklen_t addrlen;
+ int sockets_created;
+
+ /* Pipe to read from started processes stdout (on read end) */
+ plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
+
+ sockets_created = 0;
+ if (plugin->server_stdout == NULL)
+ return sockets_created;
+
+ if (plugin->behind_nat == GNUNET_YES)
+ {
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Starting gnunet-nat-server process\n");
+#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_NAT
+ 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);
+ }
+
+ udp_sock.desc = NULL;
- desc = NULL;
- if (GNUNET_YES !=
+
+ 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_NAT
+ 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_NAT
+ 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"))
+ "DISABLE-IPV6")))
{
- desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
- if (desc != NULL)
+ 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
#endif
serverAddrv6.sin6_family = AF_INET6;
serverAddrv6.sin6_addr = in6addr_any;
- serverAddrv6.sin6_port = htons (plugin->open_port);
+ serverAddrv6.sin6_port = htons (plugin->port);
addrlen = sizeof (serverAddrv6);
serverAddr = (struct sockaddr *) &serverAddrv6;
+ sockets_created++;
}
}
- if (NULL == desc)
- {
- desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
- if (NULL == desc)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp", "socket");
- return NULL;
- }
- else
- {
- memset (&serverAddrv4, 0, sizeof (serverAddrv4));
-#if HAVE_SOCKADDR_IN_SIN_LEN
- serverAddrv4.sin_len = sizeof (serverAddrv4);
-#endif
- serverAddrv4.sin_family = AF_INET;
- serverAddrv4.sin_addr.s_addr = INADDR_ANY;
- serverAddrv4.sin_port = htons (plugin->open_port);
- addrlen = sizeof (serverAddrv4);
- serverAddr = (struct sockaddr *) &serverAddrv4;
- }
- }
-
- if (desc != NULL)
- {
- GNUNET_assert (GNUNET_NETWORK_socket_bind (desc, serverAddr, addrlen) ==
- GNUNET_OK);
- }
plugin->rs = GNUNET_NETWORK_fdset_create ();
GNUNET_NETWORK_fdset_zero (plugin->rs);
- GNUNET_NETWORK_fdset_set (plugin->rs, desc);
+
+
+ GNUNET_NETWORK_fdset_set (plugin->rs, udp_sock.desc);
plugin->select_task =
GNUNET_SCHEDULER_add_select (plugin->env->sched,
GNUNET_TIME_UNIT_FOREVER_REL, plugin->rs,
NULL, &udp_plugin_select, plugin);
- return desc;
+ return sockets_created;
}
static uint16_t
check_port (struct Plugin *plugin, uint16_t in_port)
{
- if ((in_port == plugin->adv_port) || (in_port == plugin->open_port))
- return in_port;
- return (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- 2) == 0)
- ? plugin->open_port : plugin->adv_port;
+
+ /* FIXME: remember what ports we are using to better respond to this */
+ return in_port;
+ /*
+ for (i = plugin->starting_port; i < plugin->num_ports + plugin->starting_port; i++)
+ {
+ if (in_port == i)
+ return in_port;
+ }
+
+ return GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
+ plugin->num_ports) + plugin->starting_port;
+ */
}
* connect to it but simply to see if the binary format is technically
* legal for establishing a connection.
*
- * @param cls handle to Plugin
- * @param addr address to check
+ * @param cls closure, should be our handle to the Plugin
+ * @param addr pointer to the address, may be modified (slightly)
* @param addrlen length of addr
* @return GNUNET_OK if this is a plausible address for this peer
* and transport, GNUNET_SYSERR if not
+ *
*/
static int
udp_check_address (void *cls, void *addr, size_t addrlen)
{
struct Plugin *plugin = cls;
- struct IPv4UdpAddress *v4;
- struct IPv6UdpAddress *v6;
+ char buf[sizeof (struct sockaddr_in6)];
- if ((addrlen != sizeof (struct IPv4UdpAddress)) &&
- (addrlen != sizeof (struct IPv6UdpAddress)))
+ struct sockaddr_in *v4;
+ struct sockaddr_in6 *v6;
+
+ if ((addrlen != sizeof (struct sockaddr_in)) &&
+ (addrlen != sizeof (struct sockaddr_in6)))
{
GNUNET_break_op (0);
return GNUNET_SYSERR;
}
- if (addrlen == sizeof (struct IPv4UdpAddress))
+ memcpy (buf, addr, sizeof (struct sockaddr_in6));
+ if (addrlen == sizeof (struct sockaddr_in))
{
- v4 = (struct IPv4UdpAddress *) addr;
- v4->u_port = htons (check_port (plugin, ntohs (v4->u_port)));
+ v4 = (struct sockaddr_in *) buf;
+ v4->sin_port = htons (check_port (plugin, ntohs (v4->sin_port)));
}
else
{
- v6 = (struct IPv6UdpAddress *) addr;
- if (IN6_IS_ADDR_LINKLOCAL (&v6->ipv6_addr))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- v6->u6_port = htons (check_port (plugin, ntohs (v6->u6_port)));
+ v6 = (struct sockaddr_in6 *) buf;
+ v6->sin6_port = htons (check_port (plugin, ntohs (v6->sin6_port)));
}
+
+#if DEBUG_UDP_NAT
+ GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
+ "udp",
+ "Informing transport service about my address `%s'.\n",
+ GNUNET_a2s (addr, addrlen));
+#endif
return GNUNET_OK;
}
void *asc_cls)
{
struct Plugin *plugin = cls;
+ const struct sockaddr_in *v4;
+ const struct sockaddr_in6 *v6;
struct PrettyPrinterContext *ppc;
- const void *sb;
- struct sockaddr_in a4;
- struct sockaddr_in6 a6;
- const struct IPv4UdpAddress *t4;
- const struct IPv6UdpAddress *t6;
- size_t sbs;
- uint16_t port;
- if (addrlen == sizeof (struct IPv6UdpAddress))
- {
- t6 = addr;
- memset (&a6, 0, sizeof (a6));
- a6.sin6_family = AF_INET6;
- a6.sin6_port = t6->u6_port;
- port = ntohs (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));
- a4.sin_family = AF_INET;
- a4.sin_port = t4->u_port;
- a4.sin_addr.s_addr = t4->ipv4_addr;
- port = ntohs (t4->u_port);
- sb = &a4;
- sbs = sizeof (a4);
- }
- else
+ if ((addrlen != sizeof (struct sockaddr_in)) &&
+ (addrlen != sizeof (struct sockaddr_in6)))
{
/* invalid address */
GNUNET_break_op (0);
ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
ppc->asc = asc;
ppc->asc_cls = asc_cls;
- ppc->port = port;
- GNUNET_RESOLVER_hostname_get (plugin->env->sched,
- plugin->env->cfg,
- sb,
- sbs,
- !numeric, timeout, &append_port, ppc);
-}
-
-
-
-/**
- * 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 const char*
-udp_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 IPv4UdpAddress *t4;
- const struct IPv6UdpAddress *t6;
- int af;
- uint16_t port;
-
- if (addrlen == sizeof (struct IPv6UdpAddress))
+ if (addrlen == sizeof (struct sockaddr_in))
{
- t6 = addr;
- af = AF_INET6;
- port = ntohs (t6->u6_port);
- memcpy (&a6, &t6->ipv6_addr, sizeof (a6));
- sb = &a6;
+ v4 = (const struct sockaddr_in *) addr;
+ ppc->port = ntohs (v4->sin_port);
}
- else if (addrlen == sizeof (struct IPv4UdpAddress))
+ else
{
- t4 = addr;
- af = AF_INET;
- port = ntohs (t4->u_port);
- memcpy (&a4, &t4->ipv4_addr, sizeof (a4));
- sb = &a4;
+ v6 = (const struct sockaddr_in6 *) addr;
+ ppc->port = ntohs (v6->sin6_port);
+
}
- else
- return NULL;
- inet_ntop (af, sb, buf, INET6_ADDRSTRLEN);
- GNUNET_snprintf (rbuf,
- sizeof (rbuf),
- "%s:%u",
- buf,
- port);
- return rbuf;
+ GNUNET_RESOLVER_hostname_get (plugin->env->sched,
+ plugin->env->cfg,
+ addr,
+ addrlen,
+ !numeric, timeout, &append_port, ppc);
}
/**
* The exported method. Makes the core api available via a global and
* returns the udp transport API.
- *
- * @param cls closure, the 'struct GNUNET_TRANSPORT_PluginEnvironment*'
- * @return the 'struct GNUNET_TRANSPORT_PluginFunctions*' or NULL on error
*/
void *
libgnunet_plugin_transport_udp_init (void *cls)
{
struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
+ unsigned long long mtu;
+ unsigned long long port;
struct GNUNET_TRANSPORT_PluginFunctions *api;
struct Plugin *plugin;
struct GNUNET_SERVICE_Context *service;
- unsigned long long aport;
- unsigned long long bport;
- unsigned long long mtu;
+ int sockets_created;
+ int behind_nat;
+ char *internal_address;
+ char *external_address;
service = GNUNET_SERVICE_start ("transport-udp", env->sched, env->cfg);
if (service == NULL)
"udp");
return NULL;
}
- aport = 0;
- if ((GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-udp",
- "PORT",
- &bport)) ||
- (bport > 65535) ||
- ((GNUNET_OK ==
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-udp",
- "ADVERTISED-PORT",
- &aport)) && (aport > 65535)))
+
+ if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
+ "transport-udp",
+ "BEHIND_NAT"))
+ behind_nat = GNUNET_YES; /* We are behind nat (according to the user) */
+ else
+ behind_nat = GNUNET_NO; /* We are not behind nat! */
+
+ external_address = NULL;
+ if ((GNUNET_YES == behind_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 valid port number for service `%s' in configuration!\n"),
+ ("Require EXTERNAL_ADDRESS for service `%s' in configuration!\n"),
"transport-udp");
GNUNET_SERVICE_stop (service);
return NULL;
}
- if (aport == 0)
- aport = bport;
+
+ internal_address = NULL;
+ if ((GNUNET_YES == behind_nat) && (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_string (env->cfg,
+ "transport-udp",
+ "INTERNAL_ADDRESS",
+ &internal_address)))
+ {
+ 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 (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_number (env->cfg,
+ "transport-udp",
+ "PORT",
+ &port))
+ port = UDP_NAT_DEFAULT_PORT;
+ else if (port > 65535)
+ {
+ 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;
+ }
mtu = 1240;
if (mtu < 1200)
"UDP");
plugin = GNUNET_malloc (sizeof (struct Plugin));
- plugin->open_port = bport;
- plugin->adv_port = aport;
+ plugin->external_address = external_address;
+ plugin->internal_address = internal_address;
+ plugin->port = port;
+ plugin->behind_nat = behind_nat;
plugin->env = env;
+
api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
api->cls = plugin;
api->disconnect = &udp_disconnect;
api->address_pretty_printer = &udp_plugin_address_pretty_printer;
api->check_address = &udp_check_address;
- api->address_to_string = &udp_address_to_string;
+
plugin->service = service;
- /* FIXME: do the two calls below periodically again and
- not just once (since the info we get might change...) */
GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
env->cfg,
&process_hostname_ips,
plugin);
- udp_sock = udp_transport_server_start (plugin);
+ sockets_created = udp_transport_server_start (plugin);
- GNUNET_assert (udp_sock != NULL);
+ GNUNET_assert (sockets_created == 1);
return api;
}
+
void *
libgnunet_plugin_transport_udp_done (void *cls)
{
struct Plugin *plugin = api->cls;
udp_transport_server_stop (plugin);
- if (NULL != plugin->hostname_dns)
+ if (NULL != hostname_dns)
{
- GNUNET_RESOLVER_request_cancel (plugin->hostname_dns);
- plugin->hostname_dns = NULL;
+ GNUNET_RESOLVER_request_cancel (hostname_dns);
+ hostname_dns = NULL;
}
GNUNET_SERVICE_stop (plugin->service);
+++ /dev/null
-/*
- This file is part of GNUnet
- (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
- 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
-*/
-
-/**
- * @file transport/plugin_transport_udp.c
- * @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_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_NAT GNUNET_YES
-
-#define MAX_PROBES 20
-
-/*
- * Transport cost to peer, always 1 for UDP (direct connection)
- */
-#define UDP_DIRECT_DISTANCE 1
-
-/**
- * Handle for request of hostname resolution, non-NULL if pending.
- */
-static struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
-
-/**
- * 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;
-
-};
-
-
-/* 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;
-
-};
-
-
-
-/**
- * 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 sockaddr_in sock_addr;
-
- /**
- * The port to send this probe to, 0 to choose randomly
- */
- int port;
-
-};
-
-
-/**
- * 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;
-
- /*
- * 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;
-
- /**
- * 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_nat_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_nat_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_nat_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_nat_sock.desc);
- if (ok == GNUNET_OK)
- udp_nat_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_nat_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;
-
- if ((addr == NULL) || (addrlen == 0))
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("udp_nat_plugin_send called without address, returning!\n"));
-#endif
- 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);
-
- /* Actually send the message */
- sent =
- GNUNET_NETWORK_socket_sendto (send_handle, message, ssize,
- addr,
- addrlen);
-
- 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 inet4[INET_ADDRSTRLEN];
- char *address_as_string;
- char *port_as_string;
- pid_t pid;
- const struct sockaddr *sa = (const struct sockaddr *)addr;
-
- if (addrlen < sizeof (struct sockaddr))
- return;
- switch (sa->sa_family)
- {
- case AF_INET:
- if (addrlen != sizeof (struct sockaddr_in))
- return;
- inet_ntop (AF_INET,
- &((struct sockaddr_in *) sa)->sin_addr,
- inet4, INET_ADDRSTRLEN);
- address_as_string = GNUNET_strdup (inet4);
- break;
- case AF_INET6:
- default:
- return;
- }
-
- GNUNET_asprintf(&port_as_string, "%d", plugin->port);
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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_nat_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;
- struct sockaddr_in *sockaddr = (struct sockaddr_in *)addr;
- int other_peer_natd;
-
- GNUNET_assert (NULL == session);
- other_peer_natd = GNUNET_NO;
- if ((sockaddr->sin_family == AF_INET) && (ntohs(sockaddr->sin_port) == 0))
- {
- other_peer_natd = GNUNET_YES;
- }
-
- sent = 0;
-
- if (other_peer_natd == 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->next = NULL;
- 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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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_nat_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 /* Other peer not behind a NAT, so we can just send the message as is */
- {
- sent = udp_nat_real_send(cls, udp_nat_sock.desc, target, msgbuf, msgbuf_size, priority, timeout, addr, addrlen, cont, cont_cls);
- }
-
- if (sent == GNUNET_SYSERR)
- return 0;
-
- return sent;
-}
-
-
-/**
- * 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 sockaddr_in *v4;
- struct sockaddr_in6 *v6;
-
- af = addr->sa_family;
- if (af == AF_INET)
- {
- v4 = (struct sockaddr_in *) addr;
- if (plugin->behind_nat == GNUNET_YES)
- {
- GNUNET_assert(inet_pton(AF_INET, plugin->external_address, &v4->sin_addr) == GNUNET_OK);
- v4->sin_port = htons (0); /* Indicates to receiver we are behind NAT */
- }
- else
- v4->sin_port = htons (plugin->port);
- }
- else
- {
- GNUNET_assert (af == AF_INET6);
- v6 = (struct sockaddr_in6 *) addr;
- if (plugin->behind_nat == GNUNET_YES)
- v6->sin6_port = htons (0);
- else
- v6->sin6_port = htons (plugin->port);
- }
-
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO |
- GNUNET_ERROR_TYPE_BULK,
- "udp-nat", _("Found address `%s' (%s)\n"),
- GNUNET_a2s (addr, addrlen), name);
- plugin->env->notify_address (plugin->env->cls,
- "udp_nat",
- addr, addrlen, 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 (probe->port != 0)
- probe->sock_addr.sin_port = htons(probe->port);
- else
- probe->sock_addr.sin_port = htons(plugin->port);
-
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("Sending a probe to port %d\n"), ntohs(probe->sock_addr.sin_port));
-#endif
-
- probe->count++;
-
- udp_nat_real_send(plugin, udp_nat_sock.desc, NULL,
- (char *)message, ntohs(message->header.size), 0,
- GNUNET_TIME_relative_get_unit(),
- &probe->sock_addr, sizeof(probe->sock_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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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_nat_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;
- bytes = GNUNET_DISK_file_read(plugin->server_stdout_handle, &mybuf, sizeof(mybuf));
-
- if (bytes < 1)
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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);
-
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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.
- */
- 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]);
- temp_probe->sock_addr.sin_family = AF_INET;
- GNUNET_assert(inet_pton(AF_INET, &mybuf[0], &temp_probe->sock_addr.sin_addr) == 1);
- temp_probe->port = 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_nat_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_nat_demultiplexer(struct Plugin *plugin, struct GNUNET_PeerIdentity *sender, const struct GNUNET_MessageHeader *currhdr, struct sockaddr_storage *sender_addr, socklen_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;
-
- if (memcmp(sender, plugin->env->my_identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("Received a message from myself, dropping!!!\n"));
-#endif
- return;
- }
-
- 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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("Received a probe on listen port %d, sent_from port %d\n"), sockinfo->port, ntohs(((struct sockaddr_in *)sender_addr)->sin_port));
-#endif
-
- udp_nat_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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("Sent PROBE REPLY to port %d on outgoing port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("Received PROBE REPLY from port %d on incoming port %d\n"), ntohs(((struct sockaddr_in *)sender_addr)->sin_port), sockinfo->port);
-#endif
- /* FIXME: use nonce, then IPv6 replies could work I think... */
- if (sender_addr->ss_family == AF_INET)
- {
- memset(&addr_buf, 0, sizeof(addr_buf));
- inet_ntop(AF_INET, &((struct sockaddr_in *) sender_addr)->sin_addr, addr_buf, INET_ADDRSTRLEN);
- outgoing_probe = find_probe(plugin, &addr_buf[0]);
- if (outgoing_probe != NULL)
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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_nat_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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat",
- _("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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("Looking up peer session for peer %s\n"), GNUNET_i2s(sender));
-#endif
- if (peer_session == NULL) /* Shouldn't this NOT happen? */
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat",
- _("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;
- /* FIXME: There is no way to find this based on receiving port at the moment! */
- peer_session->sock = sockinfo->desc; /* This may matter, not sure right now... */
- ((struct sockaddr_in *)peer_session->connect_addr)->sin_port = ((struct sockaddr_in *) sender_addr)->sin_port;
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat",
- _("Received a probe confirmation, will send to peer on port %d\n"), ntohs(((struct sockaddr_in *)peer_session->connect_addr)->sin_port));
-#endif
- if (peer_session->messages != NULL)
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat",
- _("Received a probe confirmation, sending queued messages.\n"));
-#endif
- pending_message = peer_session->messages;
- int count = 0;
- while (pending_message != NULL)
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat",
- _("sending queued message %d\n"), count);
-#endif
- udp_nat_real_send(plugin, peer_session->sock, &peer_session->target, pending_message->msgbuf, pending_message->msgbuf_size, 0, GNUNET_TIME_relative_get_unit(), peer_session->connect_addr, peer_session->connect_alen, pending_message->cont, pending_message->cont_cls);
- pending_message_temp = pending_message;
- pending_message = pending_message->next;
- GNUNET_free(pending_message_temp->msgbuf);
- GNUNET_free(pending_message_temp);
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat",
- _("finished sending queued message %d\n"), count);
-#endif
- count++;
- }
- }
-
- }
- else
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat",
- _("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:
- plugin->env->receive (plugin->env->cls, sender, currhdr, UDP_DIRECT_DISTANCE,
- NULL, (char *)sender_addr, fromlen);
- }
-
-}
-
-
-/*
- * @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.
- *
- */
-static void
-udp_nat_plugin_select (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
-{
- struct Plugin *plugin = cls;
- char *buf;
- struct UDPMessage *msg;
- struct GNUNET_PeerIdentity *sender;
- unsigned int buflen;
- socklen_t fromlen;
- struct sockaddr_storage addr;
- ssize_t ret;
- int offset;
- int count;
- int tsize;
-
- char *msgbuf;
- const struct GNUNET_MessageHeader *currhdr;
-
- buf = NULL;
- sender = NULL;
-
- buflen = GNUNET_NETWORK_socket_recvfrom_amount (udp_nat_sock.desc);
-
- if (buflen == GNUNET_NO)
- return;
-
- buf = GNUNET_malloc (buflen);
- fromlen = sizeof (addr);
- memset (&addr, 0, fromlen);
- ret =
- GNUNET_NETWORK_socket_recvfrom (udp_nat_sock.desc, buf, buflen,
- (struct sockaddr *) &addr, &fromlen);
-
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp-nat", _
- ("socket_recv returned %u, src_addr_len is %u\n"), ret,
- fromlen);
-#endif
-
- if (ret <= 0)
- {
- GNUNET_free (buf);
- return;
- }
- msg = (struct UDPMessage *) buf;
-
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("header reports message size of %d, type %d\n"),
- ntohs (msg->header.size), ntohs (msg->header.type));
-#endif
- if (ntohs (msg->header.size) < sizeof (struct UDPMessage))
- {
- GNUNET_free (buf);
- return;
- }
-
- msgbuf = (char *)&msg[1];
- sender = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
- memcpy (sender, &msg->sender, sizeof (struct GNUNET_PeerIdentity));
-
- offset = 0;
- count = 0;
- tsize = ntohs (msg->header.size) - sizeof(struct UDPMessage);
-
- while (offset < tsize)
- {
- currhdr = (struct GNUNET_MessageHeader *)&msgbuf[offset];
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("processing msg %d: type %d, size %d at offset %d\n"),
- count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
-#endif
- udp_nat_demultiplexer(plugin, sender, currhdr, &addr, fromlen, &udp_nat_sock);
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO, "udp", _
- ("processing done msg %d: type %d, size %d at offset %d\n"),
- count, ntohs(currhdr->type), ntohs(currhdr->size), offset);
-#endif
- offset += ntohs(currhdr->size);
- count++;
- }
- GNUNET_free_non_null (buf);
- GNUNET_free_non_null (sender);
-
-
- 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_nat_plugin_select, plugin);
-
-}
-
-/**
- * Create a slew of UDP sockets. If possible, use IPv6, otherwise
- * try IPv4.
- *
- * @param cls closure for server start, should be a struct Plugin *
- *
- * @return number of sockets created or GNUNET_SYSERR on error
- */
-static int
-udp_nat_transport_server_start (void *cls)
-{
- struct Plugin *plugin = cls;
- struct sockaddr_in serverAddrv4;
- struct sockaddr_in6 serverAddrv6;
- struct sockaddr *serverAddr;
- socklen_t addrlen;
- int sockets_created;
-
- /* Pipe to read from started processes stdout (on read end) */
- plugin->server_stdout = GNUNET_DISK_pipe(GNUNET_YES);
-
- sockets_created = 0;
- if (plugin->server_stdout == NULL)
- return sockets_created;
-
- if (plugin->behind_nat == GNUNET_YES)
- {
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
- "udp_nat",
- "Starting gnunet-nat-server process\n");
-#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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
- "udp_nat",
- "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_nat_plugin_server_read, plugin);
- }
-
- udp_nat_sock.desc = NULL;
-
-
- udp_nat_sock.desc = GNUNET_NETWORK_socket_create (PF_INET, SOCK_DGRAM, 17);
- if (NULL == udp_nat_sock.desc)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "udp-nat", "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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
- "udp_nat",
- "Binding to port %d\n", ntohs(serverAddrv4.sin_port));
-#endif
- while (GNUNET_NETWORK_socket_bind (udp_nat_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_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
- "udp_nat",
- "Binding failed, trying new port %d\n", ntohs(serverAddrv4.sin_port));
-#endif
- }
- udp_nat_sock.port = ntohs(serverAddrv4.sin_port);
- sockets_created++;
- }
-
-
- if ((udp_nat_sock.desc == NULL) && (GNUNET_YES !=
- GNUNET_CONFIGURATION_get_value_yesno (plugin->env->cfg, "GNUNETD",
- "DISABLE-IPV6")))
- {
- udp_nat_sock.desc = GNUNET_NETWORK_socket_create (PF_INET6, SOCK_DGRAM, 17);
- if (udp_nat_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_nat_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_nat_plugin_select, plugin);
-
- return sockets_created;
-}
-
-
-/**
- * Check if the given port is plausible (must be either
- * our listen port or our advertised port). If it is
- * neither, we return one of these two ports at random.
- *
- * @return either in_port or a more plausible port
- */
-static uint16_t
-check_port (struct Plugin *plugin, uint16_t in_port)
-{
-
- /* FIXME: remember what ports we are using to better respond to this */
- return in_port;
- /*
- for (i = plugin->starting_port; i < plugin->num_ports + plugin->starting_port; i++)
- {
- if (in_port == i)
- return in_port;
- }
-
- return GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- plugin->num_ports) + plugin->starting_port;
- */
-}
-
-
-/**
- * Another peer has suggested an address for this peer and transport
- * plugin. Check that this could be a valid address. This function
- * is not expected to 'validate' the address in the sense of trying to
- * connect to it but simply to see if the binary format is technically
- * legal for establishing a connection.
- *
- * @param cls closure, should be our handle to the Plugin
- * @param addr pointer to the address, may be modified (slightly)
- * @param addrlen length of addr
- * @return GNUNET_OK if this is a plausible address for this peer
- * and transport, GNUNET_SYSERR if not
- *
- */
-static int
-udp_nat_check_address (void *cls, void *addr, size_t addrlen)
-{
- struct Plugin *plugin = cls;
- char buf[sizeof (struct sockaddr_in6)];
-
- struct sockaddr_in *v4;
- struct sockaddr_in6 *v6;
-
- if ((addrlen != sizeof (struct sockaddr_in)) &&
- (addrlen != sizeof (struct sockaddr_in6)))
- {
- GNUNET_break_op (0);
- return GNUNET_SYSERR;
- }
- memcpy (buf, addr, sizeof (struct sockaddr_in6));
- if (addrlen == sizeof (struct sockaddr_in))
- {
- v4 = (struct sockaddr_in *) buf;
- v4->sin_port = htons (check_port (plugin, ntohs (v4->sin_port)));
- }
- else
- {
- v6 = (struct sockaddr_in6 *) buf;
- v6->sin6_port = htons (check_port (plugin, ntohs (v6->sin6_port)));
- }
-
-#if DEBUG_UDP_NAT
- GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG,
- "udp_nat",
- "Informing transport service about my address `%s'.\n",
- GNUNET_a2s (addr, addrlen));
-#endif
- return GNUNET_OK;
-}
-
-
-/**
- * Append our port and forward the result.
- */
-static void
-append_port (void *cls, const char *hostname)
-{
- 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);
-}
-
-
-/**
- * Convert the transports address to a nice, human-readable
- * format.
- *
- * @param cls closure
- * @param type name of the transport that generated the address
- * @param addr one of the addresses of the host, NULL for the last address
- * the specific address format depends on the transport
- * @param addrlen length of the address
- * @param numeric should (IP) addresses be displayed in numeric form?
- * @param timeout after how long should we give up?
- * @param asc function to call on each string
- * @param asc_cls closure for asc
- */
-static void
-udp_nat_plugin_address_pretty_printer (void *cls,
- const char *type,
- const void *addr,
- size_t addrlen,
- int numeric,
- struct GNUNET_TIME_Relative timeout,
- GNUNET_TRANSPORT_AddressStringCallback asc,
- void *asc_cls)
-{
- struct Plugin *plugin = cls;
- const struct sockaddr_in *v4;
- const struct sockaddr_in6 *v6;
- struct PrettyPrinterContext *ppc;
-
- if ((addrlen != sizeof (struct sockaddr_in)) &&
- (addrlen != sizeof (struct sockaddr_in6)))
- {
- /* invalid address */
- GNUNET_break_op (0);
- asc (asc_cls, NULL);
- return;
- }
- ppc = GNUNET_malloc (sizeof (struct PrettyPrinterContext));
- ppc->asc = asc;
- ppc->asc_cls = asc_cls;
- if (addrlen == sizeof (struct sockaddr_in))
- {
- 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);
-}
-
-
-/**
- * The exported method. Makes the core api available via a global and
- * returns the udp transport API.
- */
-void *
-libgnunet_plugin_transport_udp_nat_init (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginEnvironment *env = cls;
- unsigned long long mtu;
- unsigned long long port;
- struct GNUNET_TRANSPORT_PluginFunctions *api;
- struct Plugin *plugin;
- struct GNUNET_SERVICE_Context *service;
- int sockets_created;
- int behind_nat;
- char *internal_address;
- char *external_address;
-
- service = GNUNET_SERVICE_start ("transport-udp-nat", env->sched, env->cfg);
- if (service == NULL)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING, "udp_nat", _
- ("Failed to start service for `%s' transport plugin.\n"),
- "udp-nat");
- return NULL;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_string (env->cfg,
- "transport-udp-nat",
- "EXTERNAL_ADDRESS",
- &external_address))
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
- "udp_nat",
- _
- ("Require EXTERNAL_ADDRESS for service `%s' in configuration!\n"),
- "transport-udp");
- GNUNET_SERVICE_stop (service);
- return NULL;
- }
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_string (env->cfg,
- "transport-udp-nat",
- "INTERNAL_ADDRESS",
- &internal_address))
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_ERROR,
- "udp_nat",
- _
- ("Require INTERNAL_ADDRESS for service `%s' in configuration!\n"),
- "transport-udp");
- GNUNET_SERVICE_stop (service);
- GNUNET_free_non_null(external_address);
- return NULL;
- }
-
- if (GNUNET_YES == GNUNET_CONFIGURATION_get_value_yesno (env->cfg,
- "transport-udp-nat",
- "BEHIND_NAT"))
- behind_nat = GNUNET_YES; /* We are behind nat (according to the user) */
- else
- behind_nat = GNUNET_NO; /* We are not behind nat! */
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_number (env->cfg,
- "transport-udp-nat",
- "PORT",
- &port))
- port = UDP_NAT_DEFAULT_PORT;
- else if (port > 65535)
- {
- GNUNET_log_from (GNUNET_ERROR_TYPE_WARNING,
- "udp_nat",
- _("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;
- }
-
- mtu = 1240;
- if (mtu < 1200)
- GNUNET_log_from (GNUNET_ERROR_TYPE_INFO,
- "udp_nat",
- _("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->env = env;
-
- api = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_PluginFunctions));
- api->cls = plugin;
-
- api->send = &udp_nat_plugin_send;
- api->disconnect = &udp_nat_disconnect;
- api->address_pretty_printer = &udp_nat_plugin_address_pretty_printer;
- api->check_address = &udp_nat_check_address;
-
- plugin->service = service;
-
- GNUNET_OS_network_interfaces_list (&process_interfaces, plugin);
- plugin->hostname_dns = GNUNET_RESOLVER_hostname_resolve (env->sched,
- env->cfg,
- AF_UNSPEC,
- HOSTNAME_RESOLVE_TIMEOUT,
- &process_hostname_ips,
- plugin);
-
- sockets_created = udp_nat_transport_server_start (plugin);
-
- GNUNET_assert (sockets_created == 1);
-
- return api;
-}
-
-
-void *
-libgnunet_plugin_transport_udp_nat_done (void *cls)
-{
- struct GNUNET_TRANSPORT_PluginFunctions *api = cls;
- struct Plugin *plugin = api->cls;
-
- udp_nat_transport_server_stop (plugin);
- if (NULL != hostname_dns)
- {
- GNUNET_RESOLVER_request_cancel (hostname_dns);
- hostname_dns = NULL;
- }
- GNUNET_SERVICE_stop (plugin->service);
-
- GNUNET_NETWORK_fdset_destroy (plugin->rs);
- GNUNET_free (plugin);
- GNUNET_free (api);
- return NULL;
-}
-
-/* end of plugin_transport_udp.c */
projects / oweals / gnunet.git / commitdiff