--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2009, 2010, 2011, 2016 GNUnet e.V.
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file nat/gnunet-service-nat_helper.c
+ * @brief runs the gnunet-helper-nat-server
+ * @author Milan Bouchet-Valat
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet-service-nat_helper.h"
+
+#define LOG(kind,...) GNUNET_log_from (kind, "nat", __VA_ARGS__)
+
+/**
+ * Information we keep per NAT helper process.
+ */
+struct HelperContext
+{
+
+ /**
+ * IP address we pass to the NAT helper.
+ */
+ const char *internal_address;
+
+ /**
+ * Function to call if we receive a reversal request.
+ */
+ GN_ReversalCallback cb;
+
+ /**
+ * Closure for @e cb.
+ */
+ void *cb_cls;
+
+ /**
+ * How long do we wait for restarting a crashed gnunet-helper-nat-server?
+ */
+ struct GNUNET_TIME_Relative server_retry_delay;
+
+ /**
+ * ID of select gnunet-helper-nat-server stdout read task
+ */
+ struct GNUNET_SCHEDULER_Task *server_read_task;
+
+ /**
+ * The process id of the server process (if behind NAT)
+ */
+ struct GNUNET_OS_Process *server_proc;
+
+ /**
+ * stdout pipe handle for the gnunet-helper-nat-server process
+ */
+ struct GNUNET_DISK_PipeHandle *server_stdout;
+
+ /**
+ * stdout file handle (for reading) for the gnunet-helper-nat-server process
+ */
+ const struct GNUNET_DISK_FileHandle *server_stdout_handle;
+};
+
+
+/**
+ * Task that restarts the gnunet-helper-nat-server process after a crash
+ * after a certain delay.
+ *
+ * @param cls a `struct HelperContext`
+ */
+static void
+restart_nat_server (void *cls);
+
+
+/**
+ * Try again starting the helper later
+ *
+ * @param h context of the helper
+ */
+static void
+try_again (struct HelperContext *h)
+{
+ GNUNET_assert (NULL == h->server_read_task);
+ h->server_retry_delay
+ = GNUNET_TIME_STD_BACKOFF (h->server_retry_delay);
+ h->server_read_task
+ = GNUNET_SCHEDULER_add_delayed (h->server_retry_delay,
+ &restart_nat_server,
+ h);
+}
+
+
+/**
+ * We have been notified that gnunet-helper-nat-server has written
+ * something to stdout. Handle the output, then reschedule this
+ * function to be called again once more is available.
+ *
+ * @param cls the `struct HelperContext`
+ */
+static void
+nat_server_read (void *cls)
+{
+ struct HelperContext *h = cls;
+ char mybuf[40];
+ ssize_t bytes;
+ int port;
+ const char *port_start;
+ struct sockaddr_in sin_addr;
+
+ h->server_read_task = NULL;
+ memset (mybuf,
+ 0,
+ sizeof (mybuf));
+ bytes
+ = GNUNET_DISK_file_read (h->server_stdout_handle,
+ mybuf,
+ sizeof (mybuf));
+ if (bytes < 1)
+ {
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Finished reading from server stdout with code: %d\n",
+ bytes);
+ if (0 != GNUNET_OS_process_kill (h->server_proc,
+- GNUNET_TERM_SIG))
+ GNUNET_log_from_strerror (GNUNET_ERROR_TYPE_WARNING,
+ "nat",
+ "kill");
+ GNUNET_OS_process_wait (h->server_proc);
+ GNUNET_OS_process_destroy (h->server_proc);
+ h->server_proc = NULL;
+ GNUNET_DISK_pipe_close (h->server_stdout);
+ h->server_stdout = NULL;
+ h->server_stdout_handle = NULL;
+ try_again (h);
+ return;
+ }
+
+ port_start = NULL;
+ for (size_t i = 0; i < sizeof (mybuf); i++)
+ {
+ if (mybuf[i] == '\n')
+ {
+ mybuf[i] = '\0';
+ break;
+ }
+ if ((mybuf[i] == ':') && (i + 1 < sizeof (mybuf)))
+ {
+ mybuf[i] = '\0';
+ port_start = &mybuf[i + 1];
+ }
+ }
+
+ /* construct socket address of sender */
+ memset (&sin_addr,
+ 0,
+ sizeof (sin_addr));
+ sin_addr.sin_family = AF_INET;
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ sin_addr.sin_len = sizeof (sin_addr);
+#endif
+ if ( (NULL == port_start) ||
+ (1 != SSCANF (port_start,
+ "%d",
+ &port)) ||
+ (-1 == inet_pton (AF_INET,
+ mybuf,
+ &sin_addr.sin_addr)))
+ {
+ /* should we restart gnunet-helper-nat-server? */
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "nat",
+ _("gnunet-helper-nat-server generated malformed address `%s'\n"),
+ mybuf);
+ h->server_read_task
+ = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+ h->server_stdout_handle,
+ &nat_server_read,
+ h);
+ return;
+ }
+ sin_addr.sin_port = htons ((uint16_t) port);
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "gnunet-helper-nat-server read: %s:%d\n",
+ mybuf,
+ port);
+ h->cb (h->cb_cls,
+ &sin_addr);
+ h->server_read_task
+ = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+ h->server_stdout_handle,
+ &nat_server_read,
+ h);
+}
+
+
+/**
+ * Task that restarts the gnunet-helper-nat-server process after a crash
+ * after a certain delay.
+ *
+ * @param cls a `struct HelperContext`
+ */
+static void
+restart_nat_server (void *cls)
+{
+ struct HelperContext *h = cls;
+ char *binary;
+
+ h->server_read_task = NULL;
+ h->server_stdout
+ = GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES,
+ GNUNET_NO, GNUNET_YES);
+ if (NULL == h->server_stdout)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR,
+ "pipe");
+ try_again (h);
+ return;
+ }
+ LOG (GNUNET_ERROR_TYPE_DEBUG,
+ "Starting `%s' at `%s'\n",
+ "gnunet-helper-nat-server",
+ h->internal_address);
+ /* Start the server process */
+ binary
+ = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-server");
+ h->server_proc
+ = GNUNET_OS_start_process (GNUNET_NO,
+ 0,
+ NULL,
+ h->server_stdout,
+ NULL,
+ binary,
+ "gnunet-helper-nat-server",
+ h->internal_address,
+ NULL);
+ GNUNET_free (binary);
+ if (NULL == h->server_proc)
+ {
+ LOG (GNUNET_ERROR_TYPE_WARNING,
+ "nat",
+ _("Failed to start %s\n"),
+ "gnunet-helper-nat-server");
+ GNUNET_DISK_pipe_close (h->server_stdout);
+ h->server_stdout = NULL;
+ try_again (h);
+ return;
+ }
+ /* Close the write end of the read pipe */
+ GNUNET_DISK_pipe_close_end (h->server_stdout,
+ GNUNET_DISK_PIPE_END_WRITE);
+ h->server_stdout_handle
+ = GNUNET_DISK_pipe_handle (h->server_stdout,
+ GNUNET_DISK_PIPE_END_READ);
+ h->server_read_task
+ = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
+ h->server_stdout_handle,
+ &nat_server_read,
+ h);
+}
+
+
+/**
+ * Start the gnunet-helper-nat-server and process incoming
+ * requests.
+ *
+ * @param internal_address
+ * @param cb function to call if we receive a request
+ * @param cb_cls closure for @a cb
+ * @return NULL on error
+ */
+struct HelperContext *
+GN_start_gnunet_nat_server_ (const char *internal_address,
+ GN_ReversalCallback cb,
+ void *cb_cls)
+{
+ struct HelperContext *h;
+
+ h = GNUNET_new (struct HelperContext);
+ h->cb = cb;
+ h->cb_cls = cb_cls;
+ h->internal_address
+ = internal_address;
+ if (NULL == h->server_stdout)
+ {
+ GN_stop_gnunet_nat_server_ (h);
+ return NULL;
+ }
+ return h;
+}
+
+
+/**
+ * Start the gnunet-helper-nat-server and process incoming
+ * requests.
+ *
+ * @param h helper context to stop
+ */
+void
+GN_stop_gnunet_nat_server_ (struct HelperContext *h)
+{
+ if (NULL != h->server_read_task)
+ {
+ GNUNET_SCHEDULER_cancel (h->server_read_task);
+ h->server_read_task = NULL;
+ }
+ if (NULL != h->server_proc)
+ {
+ if (0 != GNUNET_OS_process_kill (h->server_proc,
+ GNUNET_TERM_SIG))
+ GNUNET_log_from_strerror (GNUNET_ERROR_TYPE_WARNING,
+ "nat",
+ "kill");
+ GNUNET_OS_process_wait (h->server_proc);
+ GNUNET_OS_process_destroy (h->server_proc);
+ h->server_proc = NULL;
+ GNUNET_DISK_pipe_close (h->server_stdout);
+ h->server_stdout = NULL;
+ h->server_stdout_handle = NULL;
+ }
+ if (NULL != h->server_stdout)
+ {
+ GNUNET_DISK_pipe_close (h->server_stdout);
+ h->server_stdout = NULL;
+ h->server_stdout_handle = NULL;
+ }
+ GNUNET_free (h);
+}
+
+/* end of gnunet-service-nat_helper.c */
--- /dev/null
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2009, 2010, 2011, 2016 GNUnet e.V.
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, or (at your
+ option) any later version.
+
+ GNUnet is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file nat/gnunet-service-nat_helper.h
+ * @brief runs the gnunet-helper-nat-server
+ * @author Milan Bouchet-Valat
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "gnunet_util_lib.h"
+
+
+/**
+ * Information we keep per NAT helper process.
+ */
+struct HelperContext;
+
+
+/**
+ * Function called whenever we get a connection reversal
+ * request from another peer.
+ *
+ * @param cls closure
+ * @param ra IP address of the peer who wants us to connect to it
+ */
+typedef void
+(*GN_ReversalCallback) (void *cls,
+ const struct sockaddr_in *ra);
+
+
+/**
+ * Start the gnunet-helper-nat-server and process incoming
+ * requests.
+ *
+ * @param internal_address
+ * @param cb function to call if we receive a request
+ * @param cb_cls closure for @a cb
+ * @return NULL on error
+ */
+struct HelperContext *
+GN_start_gnunet_nat_server_ (const char *internal_address,
+ GN_ReversalCallback cb,
+ void *cb_cls);
+
+
+/**
+ * Start the gnunet-helper-nat-server and process incoming
+ * requests.
+ *
+ * @param h helper context to stop
+ */
+void
+GN_stop_gnunet_nat_server_ (struct HelperContext *h);
+
+
+/* end of gnunet-service-nat_helper.h */
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