*/
#include "system.h"
+#include "crypto.h"
#include "conf.h"
#include "control.h"
#include "control_common.h"
#include "graph.h"
#include "logger.h"
+#include "protocol.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;
+char controlcookie[65];
+extern char *controlcookiename;
-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);
-
- 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, 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(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(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_loopexit(NULL);
+ 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);
+
+ case REQ_DUMP_EDGES:
+ return dump_edges(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_SUBNETS:
+ return dump_subnets(c);
- if(req.type == REQ_DUMP_CONNECTIONS) {
- logger(LOG_NOTICE, "Got '%s' command", "dump connections");
- res.res_errno = dump_connections(res_data);
- goto respond;
- }
-
- 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;
- }
-
- if(req.type == REQ_RELOAD) {
- logger(LOG_NOTICE, "Got '%s' command", "reload");
- res.res_errno = reload_configuration();
- goto respond;
- }
-
- 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;
-
-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);
-}
-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));
+ case REQ_RETRY:
+ retry();
+ return control_ok(c, REQ_RETRY);
- close(event->ev_read.ev_fd);
- splay_delete(control_socket_tree, event);
-}
-
-static void handle_new_control_socket(int fd, short events, void *data) {
- int newfd;
- struct bufferevent *ev;
- tinc_ctl_greeting_t greeting;
-
- newfd = accept(fd, NULL, NULL);
-
- if(newfd < 0) {
- logger(LOG_ERR, "Accepting a new connection failed: %s", strerror(errno));
- event_del(&control_event);
- return;
- }
-
- 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;
- }
+ case REQ_RELOAD:
+ logger(LOG_NOTICE, "Got '%s' command", "reload");
+ int result = reload_configuration();
+ return control_return(c, REQ_RELOAD, result);
- 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;
+ default:
+ return send_request(c, "%d %d", CONTROL, REQ_INVALID);
}
-
- bufferevent_enable(ev, EV_READ);
- splay_insert(control_socket_tree, ev);
-
- logger(LOG_DEBUG, "Control socket connection accepted");
-}
-
-static int control_compare(const struct event *a, const struct event *b) {
- return a < b ? -1 : a > b ? 1 : 0;
}
bool init_control() {
- int result;
+ randomize(controlcookie, sizeof controlcookie / 2);
+ bin2hex(controlcookie, controlcookie, sizeof controlcookie / 2);
+ controlcookie[sizeof controlcookie - 1] = 0;
-#ifdef HAVE_MINGW
- struct sockaddr_in addr;
- memset(&addr, 0, sizeof addr);
- addr.sin_family = AF_INET;
- addr.sin_addr.s_addr = htonl(0x7f000001);
- addr.sin_port = htons(55555);
- int option = 1;
-
- control_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
- if(control_socket < 0) {
- logger(LOG_ERR, "Creating control socket failed: %s", sockstrerror(sockerrno));
- goto bail;
+ FILE *f = fopen(controlcookiename, "w");
+ if(!f) {
+ logger(LOG_ERR, "Cannot write control socket cookie file %s: %s", controlcookiename, strerror(errno));
+ return false;
}
- setsockopt(control_socket, SOL_SOCKET, SO_REUSEADDR, &option, sizeof option);
+#ifdef HAVE_FCHMOD
+ fchmod(f, 0600);
#else
- struct sockaddr_un addr;
- char *lastslash;
-
- if(strlen(controlsocketname) >= sizeof addr.sun_path) {
- logger(LOG_ERR, "Control socket filename too long!");
- goto bail;
- }
-
- memset(&addr, 0, sizeof addr);
- addr.sun_family = AF_UNIX;
- strncpy(addr.sun_path, controlsocketname, sizeof addr.sun_path - 1);
-
- control_socket = socket(PF_UNIX, SOCK_STREAM, 0);
-
- if(control_socket < 0) {
- logger(LOG_ERR, "Creating UNIX socket failed: %s", strerror(errno));
- goto bail;
- }
-
- /*
- * 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);
-
- if(result < 0) {
- logger(LOG_ERR, "Examining control socket directory failed: %s", strerror(errno));
- goto bail;
- }
-
- 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;
- }
+ chmod(controlcookiename, 0600);
#endif
- result = bind(control_socket, (struct sockaddr *)&addr, sizeof addr);
-
- if(result < 0 && sockinuse(sockerrno)) {
-#ifndef HAVE_MINGW
- 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
-#endif
- {
- 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;
- }
- }
+ fprintf(f, "%s %s %d\n", controlcookie, myport, getpid());
+ fclose(f);
- if(result < 0) {
- logger(LOG_ERR, "Can't bind to %s: %s", controlsocketname, strerror(errno));
- goto bail;
- }
-
- if(listen(control_socket, 3) < 0) {
- logger(LOG_ERR, "Can't listen on %s: %s", controlsocketname, strerror(errno));
- goto bail;
- }
-
- control_socket_tree = splay_alloc_tree((splay_compare_t)control_compare, (splay_action_t)bufferevent_free);
-
- 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) {
- closesocket(control_socket);
- control_socket = -1;
- }
- return false;
}
void exit_control() {
- event_del(&control_event);
- closesocket(control_socket);
- unlink(controlsocketname);
+ unlink(controlcookiename);
}
projects / meshlink / blobdiff