/*
control.c -- Control socket handling.
- Copyright (C) 2007 Guus Sliepen <guus@tinc-vpn.org>
+ Copyright (C) 2013 Guus Sliepen <guus@tinc-vpn.org>
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
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., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#include <sys/un.h>
-
#include "system.h"
+#include "crypto.h"
#include "conf.h"
#include "control.h"
#include "control_common.h"
#include "graph.h"
#include "logger.h"
+#include "meta.h"
+#include "names.h"
+#include "net.h"
+#include "netutl.h"
+#include "protocol.h"
+#include "route.h"
+#include "utils.h"
#include "xalloc.h"
-static int control_socket = -1;
-static struct event control_event;
-static splay_tree_t *control_socket_tree;
-extern char *controlsocketname;
-
-static void handle_control_data(struct bufferevent *event, void *data) {
- tinc_ctl_request_t req;
- tinc_ctl_request_t res;
- struct evbuffer *res_data = NULL;
- void *req_data;
-
- if(EVBUFFER_LENGTH(event->input) < sizeof req)
- return;
-
- /* Copy the structure to ensure alignment */
- memcpy(&req, EVBUFFER_DATA(event->input), sizeof req);
+char controlcookie[65];
- if(EVBUFFER_LENGTH(event->input) < req.length)
- return;
- req_data = EVBUFFER_DATA(event->input) + sizeof req;
+static bool control_return(connection_t *c, int type, int error) {
+ return send_request(c, "%d %d %d", CONTROL, type, error);
+}
- if(req.length < sizeof req)
- goto failure;
+static bool control_ok(connection_t *c, int type) {
+ return control_return(c, type, 0);
+}
- memset(&res, 0, sizeof res);
- res.type = req.type;
- res.id = req.id;
+bool control_h(connection_t *c, const char *request) {
+ int type;
- res_data = evbuffer_new();
- if(res_data == NULL) {
- res.res_errno = ENOMEM;
- goto respond;
+ if(!c->status.control || c->allow_request != CONTROL) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Unauthorized control request from %s (%s)", c->name, c->hostname);
+ return false;
}
- if(req.type == REQ_STOP) {
- logger(LOG_NOTICE, _("Got '%s' command"), "stop");
- event_loopexit(NULL);
- goto respond;
+ if(sscanf(request, "%*d %d", &type) != 1) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CONTROL", c->name, c->hostname);
+ return false;
}
- if(req.type == REQ_DUMP_NODES) {
- logger(LOG_NOTICE, _("Got '%s' command"), "dump nodes");
- res.res_errno = dump_nodes(res_data);
- goto respond;
- }
+ switch (type) {
+ case REQ_STOP:
+ event_exit();
+ return control_ok(c, REQ_STOP);
- if(req.type == REQ_DUMP_EDGES) {
- logger(LOG_NOTICE, _("Got '%s' command"), "dump edges");
- res.res_errno = dump_edges(res_data);
- goto respond;
- }
+ case REQ_DUMP_NODES:
+ return dump_nodes(c);
- if(req.type == REQ_DUMP_SUBNETS) {
- logger(LOG_NOTICE, _("Got '%s' command"), "dump subnets");
- res.res_errno = dump_subnets(res_data);
- goto respond;
- }
+ case REQ_DUMP_EDGES:
+ return dump_edges(c);
- if(req.type == REQ_DUMP_CONNECTIONS) {
- logger(LOG_NOTICE, _("Got '%s' command"), "dump connections");
- res.res_errno = dump_connections(res_data);
- goto respond;
- }
+ case REQ_DUMP_SUBNETS:
+ return dump_subnets(c);
- if(req.type == REQ_DUMP_GRAPH) {
- logger(LOG_NOTICE, _("Got '%s' command"), "dump graph");
- res.res_errno = dump_graph(res_data);
- goto respond;
- }
+ case REQ_DUMP_CONNECTIONS:
+ return dump_connections(c);
- if(req.type == REQ_PURGE) {
- logger(LOG_NOTICE, _("Got '%s' command"), "purge");
- purge();
- goto respond;
- }
+ case REQ_PURGE:
+ purge();
+ return control_ok(c, REQ_PURGE);
- if(req.type == REQ_SET_DEBUG) {
- debug_t new_debug_level;
-
- logger(LOG_NOTICE, _("Got '%s' command"), "debug");
- if(req.length != sizeof req + sizeof debug_level)
- res.res_errno = EINVAL;
- else {
- memcpy(&new_debug_level, req_data, sizeof new_debug_level);
- logger(LOG_NOTICE, _("Changing debug level from %d to %d"),
- debug_level, new_debug_level);
- if(evbuffer_add_printf(res_data,
- _("Changing debug level from %d to %d\n"),
- debug_level, new_debug_level) == -1)
- res.res_errno = errno;
- debug_level = new_debug_level;
+ case REQ_SET_DEBUG: {
+ int new_level;
+ if(sscanf(request, "%*d %*d %d", &new_level) != 1)
+ return false;
+ send_request(c, "%d %d %d", CONTROL, REQ_SET_DEBUG, debug_level);
+ if(new_level >= 0)
+ debug_level = new_level;
+ return true;
}
- goto respond;
- }
- if(req.type == REQ_RETRY) {
- logger(LOG_NOTICE, _("Got '%s' command"), "retry");
- retry();
- goto respond;
- }
+ case REQ_RETRY:
+ retry();
+ return control_ok(c, REQ_RETRY);
- if(req.type == REQ_RELOAD) {
- logger(LOG_NOTICE, _("Got '%s' command"), "reload");
- res.res_errno = reload_configuration();
- goto respond;
- }
+ case REQ_RELOAD:
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got '%s' command", "reload");
+ int result = reload_configuration();
+ return control_return(c, REQ_RELOAD, result);
- logger(LOG_DEBUG, _("Malformed control command received"));
- res.res_errno = EINVAL;
-
-respond:
- res.length = (sizeof res)
- + ((res_data == NULL) ? 0 : EVBUFFER_LENGTH(res_data));
- evbuffer_drain(event->input, req.length);
- if(bufferevent_write(event, &res, sizeof res) == -1)
- goto failure;
- if(res_data != NULL) {
- if(bufferevent_write_buffer(event, res_data) == -1)
- goto failure;
- evbuffer_free(res_data);
- }
- return;
+ case REQ_DISCONNECT: {
+ char name[MAX_STRING_SIZE];
+ bool found = false;
-failure:
- logger(LOG_INFO, _("Closing control socket on error"));
- evbuffer_free(res_data);
- close(event->ev_read.ev_fd);
- splay_delete(control_socket_tree, event);
-}
+ if(sscanf(request, "%*d %*d " MAX_STRING, name) != 1)
+ return control_return(c, REQ_DISCONNECT, -1);
-static void handle_control_error(struct bufferevent *event, short what, void *data) {
- if(what & EVBUFFER_EOF)
- logger(LOG_DEBUG, _("Control socket connection closed by peer"));
- else
- logger(LOG_DEBUG, _("Error while reading from control socket: %s"), strerror(errno));
+ for list_each(connection_t, other, connection_list) {
+ if(strcmp(other->name, name))
+ continue;
+ terminate_connection(other, other->edge);
+ found = true;
+ }
- close(event->ev_read.ev_fd);
- splay_delete(control_socket_tree, event);
-}
+ return control_return(c, REQ_DISCONNECT, found ? 0 : -2);
+ }
-static void handle_new_control_socket(int fd, short events, void *data) {
- int newfd;
- struct bufferevent *ev;
- tinc_ctl_greeting_t greeting;
+ case REQ_DUMP_TRAFFIC:
+ return dump_traffic(c);
- newfd = accept(fd, NULL, NULL);
+ case REQ_PCAP:
+ sscanf(request, "%*d %*d %d", &c->outmaclength);
+ c->status.pcap = true;
+ pcap = true;
+ return true;
- if(newfd < 0) {
- logger(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno));
- event_del(&control_event);
- return;
- }
+ case REQ_LOG:
+ sscanf(request, "%*d %*d %d", &c->outcompression);
+ c->status.log = true;
+ logcontrol = true;
+ return true;
- ev = bufferevent_new(newfd, handle_control_data, NULL, handle_control_error, NULL);
- if(!ev) {
- logger(LOG_ERR, _("Could not create bufferevent for new control connection: %s"), strerror(errno));
- close(newfd);
- return;
+ default:
+ return send_request(c, "%d %d", CONTROL, REQ_INVALID);
}
+}
+
+bool init_control(void) {
+ randomize(controlcookie, sizeof controlcookie / 2);
+ bin2hex(controlcookie, controlcookie, sizeof controlcookie / 2);
- memset(&greeting, 0, sizeof greeting);
- greeting.version = TINC_CTL_VERSION_CURRENT;
- greeting.pid = getpid();
- if(bufferevent_write(ev, &greeting, sizeof greeting) == -1) {
- logger(LOG_ERR,
- _("Cannot send greeting for new control connection: %s"),
- strerror(errno));
- bufferevent_free(ev);
- close(newfd);
- return;
+ mode_t mask = umask(0);
+ umask(mask | 077);
+ FILE *f = fopen(pidfilename, "w");
+ umask(mask);
+
+ if(!f) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Cannot write control socket cookie file %s: %s", pidfilename, strerror(errno));
+ return false;
}
- bufferevent_enable(ev, EV_READ);
- splay_insert(control_socket_tree, ev);
+ // Get the address and port of the first listening socket
- logger(LOG_DEBUG, _("Control socket connection accepted"));
-}
+ char *localhost = NULL;
+ sockaddr_t sa;
+ socklen_t len = sizeof sa;
-static int control_compare(const struct event *a, const struct event *b) {
- return a < b ? -1 : a > b ? 1 : 0;
-}
+ // Make sure we have a valid address, and map 0.0.0.0 and :: to 127.0.0.1 and ::1.
-bool init_control() {
- int result;
- struct sockaddr_un addr;
- char *lastslash;
+ if(getsockname(listen_socket[0].tcp.fd, (struct sockaddr *)&sa, &len)) {
+ xasprintf(&localhost, "127.0.0.1 port %s", myport);
+ } else {
+ if(sa.sa.sa_family == AF_INET) {
+ if(sa.in.sin_addr.s_addr == 0)
+ sa.in.sin_addr.s_addr = htonl(0x7f000001);
+ } else if(sa.sa.sa_family == AF_INET6) {
+ static const uint8_t zero[16] = {0};
+ if(!memcmp(sa.in6.sin6_addr.s6_addr, zero, sizeof zero))
+ sa.in6.sin6_addr.s6_addr[15] = 1;
+ }
- if(strlen(controlsocketname) >= sizeof addr.sun_path) {
- logger(LOG_ERR, _("Control socket filename too long!"));
- goto bail;
+ localhost = sockaddr2hostname(&sa);
}
- memset(&addr, 0, sizeof addr);
- addr.sun_family = AF_UNIX;
- strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
+ fprintf(f, "%d %s %s\n", (int)getpid(), controlcookie, localhost);
- control_socket = socket(PF_UNIX, SOCK_STREAM, 0);
+ free(localhost);
+ fclose(f);
- if(control_socket < 0) {
- logger(LOG_ERR, _("Creating UNIX socket failed: %s"), strerror(errno));
- goto bail;
+#ifndef HAVE_MINGW
+ int unix_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if(unix_fd < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not create UNIX socket: %s", sockstrerror(sockerrno));
+ return false;
}
- /*
- * Restrict connections to our control socket by ensuring the parent
- * directory can be traversed only by root. Note this is not totally
- * race-free unless all ancestors are writable only by trusted users,
- * which we don't verify.
- */
-
- struct stat statbuf;
- lastslash = strrchr(controlsocketname, '/');
- if(lastslash != NULL) {
- *lastslash = 0; /* temporarily change controlsocketname to be dir */
- if(mkdir(controlsocketname, 0700) < 0 && errno != EEXIST) {
- logger(LOG_ERR, _("Unable to create control socket directory %s: %s"), controlsocketname, strerror(errno));
- *lastslash = '/';
- goto bail;
- }
-
- result = stat(controlsocketname, &statbuf);
- *lastslash = '/';
- } else
- result = stat(".", &statbuf);
+ struct sockaddr_un sa_un;
+ sa_un.sun_family = AF_UNIX;
+ strncpy(sa_un.sun_path, unixsocketname, sizeof sa_un.sun_path);
- if(result < 0) {
- logger(LOG_ERR, _("Examining control socket directory failed: %s"), strerror(errno));
- goto bail;
+ if(connect(unix_fd, (struct sockaddr *)&sa_un, sizeof sa_un) >= 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "UNIX socket %s is still in use!", unixsocketname);
+ return false;
}
- if(statbuf.st_uid != 0 || (statbuf.st_mode & S_IXOTH) != 0 || (statbuf.st_gid != 0 && (statbuf.st_mode & S_IXGRP)) != 0) {
- logger(LOG_ERR, _("Control socket directory ownership/permissions insecure."));
- goto bail;
- }
+ unlink(unixsocketname);
- result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
-
- if(result < 0 && errno == EADDRINUSE) {
- result = connect(control_socket, (struct sockaddr *)&addr, sizeof addr);
- if(result < 0) {
- logger(LOG_WARNING, _("Removing old control socket."));
- unlink(controlsocketname);
- result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
- } else {
- if(netname)
- logger(LOG_ERR, _("Another tincd is already running for net `%s'."), netname);
- else
- logger(LOG_ERR, _("Another tincd is already running."));
- goto bail;
- }
- }
+ umask(mask | 077);
+ int result = bind(unix_fd, (struct sockaddr *)&sa_un, sizeof sa_un);
+ umask(mask);
if(result < 0) {
- logger(LOG_ERR, _("Can't bind to %s: %s"), controlsocketname, strerror(errno));
- goto bail;
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not bind UNIX socket to %s: %s", unixsocketname, sockstrerror(sockerrno));
+ return false;
}
- if(listen(control_socket, 3) < 0) {
- logger(LOG_ERR, _("Can't listen on %s: %s"), controlsocketname, strerror(errno));
- goto bail;
+ if(listen(unix_fd, 3) < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Could not listen on UNIX socket %s: %s", unixsocketname, sockstrerror(sockerrno));
+ return false;
}
- control_socket_tree = splay_alloc_tree((splay_compare_t)control_compare, (splay_action_t)bufferevent_free);
+ io_add(&unix_socket, handle_new_unix_connection, &unix_socket, unix_fd, IO_READ);
+#endif
- event_set(&control_event, control_socket, EV_READ | EV_PERSIST, handle_new_control_socket, NULL);
- event_add(&control_event, NULL);
return true;
-
-bail:
- if(control_socket != -1) {
- close(control_socket);
- control_socket = -1;
- }
- return false;
}
-void exit_control() {
- event_del(&control_event);
- close(control_socket);
- unlink(controlsocketname);
+void exit_control(void) {
+#ifndef HAVE_MINGW
+ unlink(unixsocketname);
+ io_del(&unix_socket);
+ close(unix_socket.fd);
+#endif
+
+ unlink(pidfilename);
}
projects / tinc / blobdiff