/*
protocol.c -- handle the meta-protocol, basic functions
- Copyright (C) 1999-2005 Ivo Timmermans <ivo@tinc-vpn.org>,
- 2000-2005 Guus Sliepen <guus@tinc-vpn.org>
+ Copyright (C) 2014-2017 Guus Sliepen <guus@meshlink.io>
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 "system.h"
#include "conf.h"
#include "connection.h"
#include "logger.h"
+#include "meshlink_internal.h"
#include "meta.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
-
-bool tunnelserver = false;
+#include "submesh.h"
/* Jumptable for the request handlers */
-static bool (*request_handlers[])(connection_t *) = {
- id_h, metakey_h, challenge_h, chal_reply_h, ack_h,
- status_h, error_h, termreq_h,
- ping_h, pong_h,
- add_subnet_h, del_subnet_h,
- add_edge_h, del_edge_h,
- key_changed_h, req_key_h, ans_key_h, tcppacket_h,
+static bool (*request_handlers[])(meshlink_handle_t *, connection_t *, const char *) = {
+ id_h, NULL, NULL, NULL /* metakey_h, challenge_h, chal_reply_h */, ack_h,
+ status_h, error_h, termreq_h,
+ ping_h, pong_h,
+ NULL, NULL, //add_subnet_h, del_subnet_h,
+ add_edge_h, del_edge_h,
+ key_changed_h, req_key_h, ans_key_h, tcppacket_h, NULL, //control_h,
};
/* Request names */
static char (*request_name[]) = {
- "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
- "STATUS", "ERROR", "TERMREQ",
- "PING", "PONG",
- "ADD_SUBNET", "DEL_SUBNET",
- "ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", "PACKET",
+ "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK",
+ "STATUS", "ERROR", "TERMREQ",
+ "PING", "PONG",
+ "ADD_SUBNET", "DEL_SUBNET",
+ "ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", "PACKET", "CONTROL",
};
-static avl_tree_t *past_request_tree;
+bool check_id(const char *id) {
+ if(!id || !*id) {
+ return false;
+ }
-bool check_id(const char *id)
-{
for(; *id; id++)
- if(!isalnum(*id) && *id != '_')
+ if(!isalnum(*id) && *id != '_' && *id != '-') {
return false;
+ }
return true;
}
/* Generic request routines - takes care of logging and error
detection as well */
-bool send_request(connection_t *c, const char *format, ...)
-{
- va_list args;
- char buffer[MAXBUFSIZE];
- int len, request;
+bool send_request(meshlink_handle_t *mesh, connection_t *c, submesh_t *s, const char *format, ...) {
+ assert(c);
+ assert(format);
+ assert(*format);
- cp();
+ va_list args;
+ char request[MAXBUFSIZE];
+ int len;
- /* Use vsnprintf instead of vasprintf: faster, no memory
+ /* Use vsnprintf instead of vxasprintf: faster, no memory
fragmentation, cleanup is automatic, and there is a limit on the
input buffer anyway */
va_start(args, format);
- len = vsnprintf(buffer, MAXBUFSIZE, format, args);
+ len = vsnprintf(request, MAXBUFSIZE, format, args);
va_end(args);
if(len < 0 || len > MAXBUFSIZE - 1) {
- logger(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"),
- c->name, c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Output buffer overflow while sending request to %s", c->name);
return false;
}
- ifdebug(PROTOCOL) {
- sscanf(buffer, "%d", &request);
- ifdebug(META)
- logger(LOG_DEBUG, _("Sending %s to %s (%s): %s"),
- request_name[request], c->name, c->hostname, buffer);
- else
- logger(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request],
- c->name, c->hostname);
- }
+ logger(mesh, MESHLINK_DEBUG, "Sending %s to %s: %s", request_name[atoi(request)], c->name, request);
+
+ request[len++] = '\n';
- buffer[len++] = '\n';
+ if(c == mesh->everyone) {
+
+ if(s) {
+ broadcast_submesh_meta(mesh, NULL, s, request, len);
+ } else {
+ broadcast_meta(mesh, NULL, request, len);
+ }
- if(c == broadcast) {
- broadcast_meta(NULL, buffer, len);
return true;
- } else
- return send_meta(c, buffer, len);
+ } else {
+ return send_meta(mesh, c, request, len);
+ }
}
-void forward_request(connection_t *from)
-{
- int request;
-
- cp();
-
- ifdebug(PROTOCOL) {
- sscanf(from->buffer, "%d", &request);
- ifdebug(META)
- logger(LOG_DEBUG, _("Forwarding %s from %s (%s): %s"),
- request_name[request], from->name, from->hostname,
- from->buffer);
- else
- logger(LOG_DEBUG, _("Forwarding %s from %s (%s)"),
- request_name[request], from->name, from->hostname);
- }
+void forward_request(meshlink_handle_t *mesh, connection_t *from, submesh_t *s, const char *request) {
+ assert(from);
+ assert(request);
+ assert(*request);
- from->buffer[from->reqlen - 1] = '\n';
+ logger(mesh, MESHLINK_DEBUG, "Forwarding %s from %s: %s", request_name[atoi(request)], from->name, request);
- broadcast_meta(from, from->buffer, from->reqlen);
+ // Create a temporary newline-terminated copy of the request
+ int len = strlen(request);
+ char tmp[len + 1];
+
+ memcpy(tmp, request, len);
+ tmp[len] = '\n';
+
+ if(s) {
+ broadcast_submesh_meta(mesh, from, s, tmp, sizeof(tmp));
+ } else {
+ broadcast_meta(mesh, from, tmp, sizeof(tmp));
+ }
}
-bool receive_request(connection_t *c)
-{
- int request;
+bool receive_request(meshlink_handle_t *mesh, connection_t *c, const char *request) {
+ assert(request);
- cp();
+ if(c->outgoing && mesh->proxytype == PROXY_HTTP && c->allow_request == ID) {
+ if(!request[0] || request[0] == '\r') {
+ return true;
+ }
- if(sscanf(c->buffer, "%d", &request) == 1) {
- if((request < 0) || (request >= LAST) || !request_handlers[request]) {
- ifdebug(META)
- logger(LOG_DEBUG, _("Unknown request from %s (%s): %s"),
- c->name, c->hostname, c->buffer);
- else
- logger(LOG_ERR, _("Unknown request from %s (%s)"),
- c->name, c->hostname);
+ if(!strncasecmp(request, "HTTP/1.1 ", 9)) {
+ if(!strncmp(request + 9, "200", 3)) {
+ logger(mesh, MESHLINK_DEBUG, "Proxy request granted");
+ return true;
+ } else {
+ logger(mesh, MESHLINK_DEBUG, "Proxy request rejected: %s", request + 9);
+ return false;
+ }
+ }
+ }
+ int reqno = atoi(request);
+
+ if(reqno || *request == '0') {
+ if((reqno < 0) || (reqno >= LAST) || !request_handlers[reqno]) {
+ logger(mesh, MESHLINK_DEBUG, "Unknown request from %s: %s", c->name, request);
return false;
} else {
- ifdebug(PROTOCOL) {
- ifdebug(META)
- logger(LOG_DEBUG, _("Got %s from %s (%s): %s"),
- request_name[request], c->name, c->hostname,
- c->buffer);
- else
- logger(LOG_DEBUG, _("Got %s from %s (%s)"),
- request_name[request], c->name, c->hostname);
- }
+ logger(mesh, MESHLINK_DEBUG, "Got %s from %s: %s", request_name[reqno], c->name, request);
}
- if((c->allow_request != ALL) && (c->allow_request != request)) {
- logger(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name,
- c->hostname);
+ if((c->allow_request != ALL) && (c->allow_request != reqno)) {
+ logger(mesh, MESHLINK_ERROR, "Unauthorized request from %s", c->name);
return false;
}
- if(!request_handlers[request](c)) {
+ if(!request_handlers[reqno](mesh, c, request)) {
/* Something went wrong. Probably scriptkiddies. Terminate. */
- logger(LOG_ERR, _("Error while processing %s from %s (%s)"),
- request_name[request], c->name, c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Error while processing %s from %s", request_name[reqno], c->name);
return false;
}
} else {
- logger(LOG_ERR, _("Bogus data received from %s (%s)"),
- c->name, c->hostname);
+ logger(mesh, MESHLINK_ERROR, "Bogus data received from %s", c->name);
return false;
}
return true;
}
-static int past_request_compare(const past_request_t *a, const past_request_t *b)
-{
+static int past_request_compare(const past_request_t *a, const past_request_t *b) {
return strcmp(a->request, b->request);
}
-static void free_past_request(past_request_t *r)
-{
- cp();
-
- if(r->request)
- free(r->request);
+static void free_past_request(past_request_t *r) {
+ if(r->request) {
+ free((void *)r->request);
+ }
free(r);
}
-void init_requests(void)
-{
- cp();
+static const int request_timeout = 60;
- past_request_tree = avl_alloc_tree((avl_compare_t) past_request_compare, (avl_action_t) free_past_request);
-}
+static void age_past_requests(event_loop_t *loop, void *data) {
+ (void)data;
+ meshlink_handle_t *mesh = loop->data;
+ int left = 0, deleted = 0;
-void exit_requests(void)
-{
- cp();
+ for splay_each(past_request_t, p, mesh->past_request_tree) {
+ if(p->firstseen + request_timeout <= mesh->loop.now.tv_sec) {
+ splay_delete_node(mesh->past_request_tree, node), deleted++;
+ } else {
+ left++;
+ }
+ }
- avl_delete_tree(past_request_tree);
-}
+ if(left || deleted) {
+ logger(mesh, MESHLINK_DEBUG, "Aging past requests: deleted %d, left %d", deleted, left);
+ }
-bool seen_request(char *request)
-{
- past_request_t *new, p = {0};
+ if(left) {
+ timeout_set(&mesh->loop, &mesh->past_request_timeout, &(struct timespec) {
+ 10, prng(mesh, TIMER_FUDGE)
+ });
+ }
+}
- cp();
+bool seen_request(meshlink_handle_t *mesh, const char *request) {
+ assert(request);
+ assert(*request);
- p.request = request;
+ past_request_t *new, p = {.request = request};
- if(avl_search(past_request_tree, &p)) {
- ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Already seen request"));
+ if(splay_search(mesh->past_request_tree, &p)) {
+ logger(mesh, MESHLINK_DEBUG, "Already seen request");
return true;
} else {
new = xmalloc(sizeof(*new));
new->request = xstrdup(request);
- new->firstseen = now;
- avl_insert(past_request_tree, new);
+ new->firstseen = mesh->loop.now.tv_sec;
+
+ if(!mesh->past_request_tree->head) {
+ timeout_set(&mesh->loop, &mesh->past_request_timeout, &(struct timespec) {
+ 10, prng(mesh, TIMER_FUDGE)
+ });
+ }
+
+ splay_insert(mesh->past_request_tree, new);
return false;
}
}
-void age_past_requests(void)
-{
- avl_node_t *node, *next;
- past_request_t *p;
- int left = 0, deleted = 0;
-
- cp();
+void init_requests(meshlink_handle_t *mesh) {
+ assert(!mesh->past_request_tree);
- for(node = past_request_tree->head; node; node = next) {
- next = node->next;
- p = node->data;
+ mesh->past_request_tree = splay_alloc_tree((splay_compare_t) past_request_compare, (splay_action_t) free_past_request);
+ timeout_add(&mesh->loop, &mesh->past_request_timeout, age_past_requests, NULL, &(struct timespec) {
+ 0, 0
+ });
+}
- if(p->firstseen + pingtimeout < now)
- avl_delete_node(past_request_tree, node), deleted++;
- else
- left++;
+void exit_requests(meshlink_handle_t *mesh) {
+ if(mesh->past_request_tree) {
+ splay_delete_tree(mesh->past_request_tree);
}
- if(left || deleted)
- ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Aging past requests: deleted %d, left %d"),
- deleted, left);
+ mesh->past_request_tree = NULL;
+
+ timeout_del(&mesh->loop, &mesh->past_request_timeout);
}
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