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sushi-remote.c

/*
 * Copyright (c) 2009 Michael Kuhn
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <glib.h>

#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>

static gchar* sushi_remote_print_bus_address (void)
{
      gchar* bus_address;
      gchar* path;

      path = g_build_filename(g_get_user_config_dir(), "sushi", "bus_address", NULL);

      if (!g_file_get_contents(path, &bus_address, NULL, NULL))
      {
            bus_address = NULL;
      }

      g_free(path);

      return bus_address;
}

static gchar* sushi_remote_get_bus_address (const gchar* userhost)
{
      gchar** command;
      gchar* bus_address = NULL;
      gsize cur;

      if (strcmp(userhost, "localhost") != 0)
      {
            command = g_new(gchar*, 5);
            command[0] = g_strdup("ssh");
            command[1] = g_strdup(userhost);
            cur = 2;
      }
      else
      {
            command = g_new(gchar*, 3);
            cur = 0;
      }

      command[cur++] = g_strdup("sushi-remote");
      command[cur++] = g_strdup("--print-bus-address");
      command[cur] = NULL;

      if (!g_spawn_sync(NULL, command, NULL, G_SPAWN_SEARCH_PATH | G_SPAWN_STDERR_TO_DEV_NULL, NULL, NULL, &bus_address, NULL, NULL, NULL))
      {
            bus_address = NULL;
      }

      if (bus_address != NULL)
      {
            g_strstrip(bus_address);

            if (strlen(bus_address) == 0)
            {
                  g_free(bus_address);
                  bus_address = NULL;
            }
      }

      g_strfreev(command);

      return bus_address;
}

static gboolean sushi_remote_setup_forwarding (const gchar* userhost, guint64 port)
{
      gboolean ret;
      gchar** command;

      if (strcmp(userhost, "localhost") == 0)
      {
            return TRUE;
      }

      /* FIXME check for existing forward */

      command = g_new(gchar*, 7);
      command[0] = g_strdup("ssh");
      command[1] = g_strdup("-N");
      command[2] = g_strdup("-f");
      command[3] = g_strdup("-L");
      command[4] = g_strdup_printf("localhost:%" G_GUINT64_FORMAT ":localhost:%" G_GUINT64_FORMAT, port, port);
      command[5] = g_strdup(userhost);
      command[6] = NULL;

      ret = g_spawn_sync(NULL, command, NULL, G_SPAWN_SEARCH_PATH | G_SPAWN_STDOUT_TO_DEV_NULL | G_SPAWN_STDERR_TO_DEV_NULL, NULL, NULL, NULL, NULL, NULL, NULL);

      g_strfreev(command);

      return ret;
}

static gboolean sushi_remote_execute_command (gint argc, gchar** argv)
{
      GPid pid;
      gboolean ret;
      gchar** command;
      gint cur;

      command = g_new(gchar*, argc - 1);

      for (cur = 2; cur < argc; cur++)
      {
            command[cur - 2] = g_strdup(argv[cur]);
      }

      command[argc - 2] = NULL;

      ret = g_spawn_async(NULL, command, NULL, G_SPAWN_SEARCH_PATH | G_SPAWN_DO_NOT_REAP_CHILD | G_SPAWN_CHILD_INHERITS_STDIN, NULL, NULL, &pid, NULL);
      waitpid(pid, NULL, 0);
      g_spawn_close_pid(pid);

      g_strfreev(command);

      return ret;
}

int main (int argc, char* argv[])
{
      GError* error = NULL;

      gboolean opt_print_bus_address = FALSE;
      GOptionContext* context;
      GOptionEntry entries[] =
      {
            { "print-bus-address", 0, 0, G_OPTION_ARG_NONE, &opt_print_bus_address, NULL, NULL },
            { NULL }
      };

      gchar* bus_address = NULL;

      /*
      setlocale(LC_ALL, "");
      bindtextdomain("maki", LOCALEDIR);
      textdomain("maki");
      */

      context = g_option_context_new("[user@]host command ...");
      g_option_context_add_main_entries(context, entries, NULL);

      if (!g_option_context_parse(context, &argc, &argv, &error))
      {
            if (error)
            {
                  g_printerr("%s\n", error->message);
                  g_error_free(error);
            }

            goto error;
      }

      if (opt_print_bus_address)
      {
            bus_address = sushi_remote_print_bus_address();

            if (bus_address != NULL)
            {
                  g_print("%s", bus_address);
                  goto end;
            }
            else
            {
                  g_printerr("Bus address could not be read.\n");
                  goto error;
            }
      }
      else if (argc < 3)
      {
            gchar* help;

            help = g_option_context_get_help(context, TRUE, NULL);
            g_print("%s", help);
            g_free(help);

            goto error;
      }
      else
      {
            const gchar* userhost = argv[1];
            gchar** bus_parts;
            gchar** p;
            guint64 port = 0;

            if ((bus_address = sushi_remote_get_bus_address(userhost)) == NULL)
            {
                  g_printerr("Bus address could not be determined.\n");

                  goto error;
            }

            if (!g_str_has_prefix(bus_address, "tcp:"))
            {
                  g_printerr("Bus address has wrong format.\n");

                  goto error;
            }

            bus_parts = g_strsplit(bus_address, ",", 0);

            for (p = bus_parts; *p != NULL; p++)
            {
                  if (g_str_has_prefix(*p, "port="))
                  {
                        port = g_ascii_strtoull(*p + 5, NULL, 10);
                        break;
                  }
            }

            g_strfreev(bus_parts);

            if (port == 0)
            {
                  g_printerr("Port could not be determined.\n");

                  goto error;
            }

            sushi_remote_setup_forwarding(userhost, port);

            if (!g_setenv("SUSHI_REMOTE_BUS_ADDRESS", bus_address, TRUE))
            {
                  g_printerr("Environment variable could not be set.\n");

                  goto error;
            }

            sushi_remote_execute_command(argc, argv);
      }

end:
      g_option_context_free(context);
      g_free(bus_address);

      return 0;

error:
      g_option_context_free(context);
      g_free(bus_address);

      return 1;
}

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