/* NetworkManagerDispatcher -- Dispatches messages from NetworkManager * * Dan Williams * * This program 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 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * (C) Copyright 2004 Red Hat, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define NM_DBUS_SERVICE "org.freedesktop.NetworkManager" #define NM_DBUS_PATH "/org/freedesktop/NetworkManager" #define NM_DBUS_INTERFACE "org.freedesktop.NetworkManager" enum NMDAction { NMD_DEVICE_DONT_KNOW, NMD_DEVICE_NOW_INACTIVE, NMD_DEVICE_NOW_ACTIVE, NMD_DEVICE_IP4_ADDRESS_CHANGE }; typedef enum NMDAction NMDAction; #define NIPQUAD(addr) ((unsigned char)(addr)), \ ((unsigned char)(addr>>8)), \ ((unsigned char)(addr>>16)), \ ((unsigned char)(addr>>24)) /* * nmd_execute_scripts * * Call scripts in /etc/NetworkManager.d when devices go down or up * */ void nmd_execute_scripts (NMDAction action, char *iface_name, guint32 new_ip4_address) { DIR *dir = opendir ("/etc/NetworkManager.d"); struct dirent *ent; if (!dir) { syslog (LOG_ERR, "nmd_execute_scripts(): opendir() could not open /etc/NetworkManager.d. errno = %d", errno); return; } do { errno = 0; if ((ent = readdir (dir)) != NULL) { struct stat s; char path[500]; snprintf (path, 499, "/etc/NetworkManager.d/%s", ent->d_name); if ((ent->d_name[0] != '.') && (stat (path, &s) == 0)) { /* FIXME * We should check the permissions and only execute files that * are 0700 or 0500. */ if (S_ISREG (s.st_mode) && !S_ISLNK (s.st_mode) && (s.st_uid == 0)) { char cmd[500]; if ((action == NMD_DEVICE_NOW_INACTIVE) || (action == NMD_DEVICE_NOW_ACTIVE)) { snprintf (cmd, 499, "%s %s %s", path, iface_name, (action == NMD_DEVICE_NOW_INACTIVE ? "down" : (action == NMD_DEVICE_NOW_ACTIVE ? "up" : "error"))); } else if (action == NMD_DEVICE_IP4_ADDRESS_CHANGE) { snprintf (cmd, 499, "%s %s %u.%u.%u.%u", path, iface_name, NIPQUAD (new_ip4_address)); } system (cmd); } } } } while (ent); closedir (dir); } /* * nmd_get_device_name * * Queries NetworkManager for the name of a device, specified by a device path */ char * nmd_get_device_name (DBusConnection *connection, char *path) { DBusMessage *message; DBusMessage *reply; DBusError error; char *dev_name = NULL; if (!(message = dbus_message_new_method_call (NM_DBUS_SERVICE, path, NM_DBUS_INTERFACE, "getName"))) { syslog (LOG_ERR, "Couldn't allocate the dbus message"); return (NULL); } dbus_error_init (&error); reply = dbus_connection_send_with_reply_and_block (connection, message, -1, &error); if (dbus_error_is_set (&error)) { syslog (LOG_ERR, "%s raised: %s", error.name, error.message); dbus_message_unref (message); return (NULL); } if (reply == NULL) { syslog( LOG_ERR, "dbus reply message was NULL" ); dbus_message_unref (message); return (NULL); } /* now analyze reply */ dbus_error_init (&error); if (!dbus_message_get_args (reply, &error, DBUS_TYPE_STRING, &dev_name, DBUS_TYPE_INVALID)) { syslog (LOG_ERR, "There was an error getting the device name from NetworkManager." ); dev_name = NULL; } dbus_message_unref (reply); dbus_message_unref (message); return (dev_name); } /* * nmd_get_device_ip4_address * * Queries NetworkManager for the IPv4 address of a device, specified by a device path */ guint32 nmd_get_device_ip4_address (DBusConnection *connection, char *path) { DBusMessage *message; DBusMessage *reply; DBusError error; guint32 address; if (!(message = dbus_message_new_method_call (NM_DBUS_SERVICE, path, NM_DBUS_INTERFACE, "getIP4Address"))) { syslog (LOG_ERR, "Couldn't allocate the dbus message"); return (0); } dbus_error_init (&error); reply = dbus_connection_send_with_reply_and_block (connection, message, -1, &error); if (dbus_error_is_set (&error)) { syslog (LOG_ERR, "%s raised: %s", error.name, error.message); dbus_message_unref (message); return (0); } if (reply == NULL) { syslog( LOG_ERR, "dbus reply message was NULL" ); dbus_message_unref (message); return (0); } /* now analyze reply */ dbus_error_init (&error); if (!dbus_message_get_args (reply, &error, DBUS_TYPE_UINT32, &address, DBUS_TYPE_INVALID)) { syslog (LOG_ERR, "There was an error getting the device's IPv4 address from NetworkManager." ); address = 0; } dbus_message_unref (reply); dbus_message_unref (message); return (address); } /* * nmd_dbus_filter * * Handles dbus messages from NetworkManager, dispatches device active/not-active messages */ static DBusHandlerResult nmd_dbus_filter (DBusConnection *connection, DBusMessage *message, void *user_data) { const char *object_path; DBusError error; char *dev_object_path = NULL; gboolean handled = FALSE; NMDAction action = NMD_DEVICE_DONT_KNOW; dbus_error_init (&error); object_path = dbus_message_get_path (message); if (dbus_message_is_signal (message, NM_DBUS_INTERFACE, "DeviceIP4AddressChange")) action = NMD_DEVICE_IP4_ADDRESS_CHANGE; else if (dbus_message_is_signal (message, NM_DBUS_INTERFACE, "DeviceNoLongerActive")) action = NMD_DEVICE_NOW_INACTIVE; else if (dbus_message_is_signal (message, NM_DBUS_INTERFACE, "DeviceNowActive")) action = NMD_DEVICE_NOW_ACTIVE; if (action != NMD_DEVICE_DONT_KNOW) { if (dbus_message_get_args (message, &error, DBUS_TYPE_STRING, &dev_object_path, DBUS_TYPE_INVALID)) { char *dev_iface_name = nmd_get_device_name (connection, dev_object_path); guint32 dev_ip4_address = nmd_get_device_ip4_address (connection, dev_object_path); if (action == NMD_DEVICE_NOW_ACTIVE || action == NMD_DEVICE_NOW_INACTIVE) { syslog (LOG_NOTICE, "Device %s (%s) is now %s.", dev_object_path, dev_iface_name, (action == NMD_DEVICE_NOW_INACTIVE ? "down" : (action == NMD_DEVICE_NOW_ACTIVE ? "up" : "error"))); } else if (action == NMD_DEVICE_IP4_ADDRESS_CHANGE) { syslog (LOG_NOTICE, "Device %s (%s) now has address %u.%u.%u.%u", dev_object_path, dev_iface_name, NIPQUAD(dev_ip4_address)); } nmd_execute_scripts (action, dev_iface_name, dev_ip4_address); dbus_free (dev_iface_name); dbus_free (dev_object_path); handled = TRUE; } } return (handled ? DBUS_HANDLER_RESULT_HANDLED : DBUS_HANDLER_RESULT_NOT_YET_HANDLED); } /* * nmd_dbus_init * * Initialize a connection to NetworkManager */ static DBusConnection *nmd_dbus_init (void) { DBusConnection *connection = NULL; DBusError error; /* connect to NetworkManager service on the system bus */ dbus_error_init (&error); connection = dbus_bus_get (DBUS_BUS_SYSTEM, &error); if (connection == NULL) { syslog (LOG_ERR, "nmd_dbus_init(): could not connect to the message bus. dbus says: '%s'", error.message); dbus_error_free (&error); return (NULL); } dbus_connection_setup_with_g_main (connection, NULL); if (!dbus_connection_add_filter (connection, nmd_dbus_filter, NULL, NULL)) return (NULL); dbus_bus_add_match (connection, "type='signal'," "interface='" NM_DBUS_INTERFACE "'," "sender='" NM_DBUS_SERVICE "'," "path='" NM_DBUS_PATH "'", &error); if (dbus_error_is_set (&error)) return (NULL); return (connection); } /* * nmd_print_usage * * Prints program usage. * */ static void nmd_print_usage (void) { fprintf (stderr, "\n" "usage : NetworkManagerDispatcher [--daemon=yes|no] [--help]\n"); fprintf (stderr, "\n" " --daemon=yes|no Become a daemon\n" " --help Show this information and exit\n" "\n" "NetworkManagerDispatcher listens for device messages from NetworkManager\n" "and runs scripts in /etc/networkmanager.\n" "\n"); } /* * main * */ int main( int argc, char *argv[] ) { gboolean become_daemon = TRUE; GMainLoop *loop = NULL; DBusConnection *connection = NULL; /* Parse options */ while (1) { int c; int option_index = 0; const char *opt; static struct option options[] = { {"daemon", 1, NULL, 0}, {"help", 0, NULL, 0}, {NULL, 0, NULL, 0} }; c = getopt_long (argc, argv, "", options, &option_index); if (c == -1) break; switch (c) { case 0: opt = options[option_index].name; if (strcmp (opt, "help") == 0) { nmd_print_usage (); return 0; } else if (strcmp (opt, "daemon") == 0) { if (strcmp ("yes", optarg) == 0) become_daemon = TRUE; else if (strcmp ("no", optarg) == 0) become_daemon = FALSE; else { nmd_print_usage (); return 1; } } break; default: nmd_print_usage (); return 1; break; } } openlog("NetworkManagerDispatcher", (become_daemon) ? LOG_CONS : LOG_CONS | LOG_PERROR, (become_daemon) ? LOG_DAEMON : LOG_USER); if (become_daemon && daemon (FALSE, FALSE) < 0) { syslog( LOG_ERR, "NetworkManagerDispatcher could not daemonize. errno = %d", errno ); exit (1); } g_type_init (); if (!g_thread_supported ()) g_thread_init (NULL); /* Connect to the NetworkManager dbus service and run the main loop */ if ((connection = nmd_dbus_init ())) { loop = g_main_loop_new (NULL, FALSE); g_main_loop_run (loop); } return 0; }