/*
meta.c -- handle the meta communication
- Copyright (C) 2000-2006 Guus Sliepen <guus@tinc-vpn.org>,
- 2000-2005 Ivo Timmermans
+ 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 "splay_tree.h"
-#include "cipher.h"
#include "connection.h"
#include "logger.h"
+#include "meshlink_internal.h"
#include "meta.h"
#include "net.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
-bool send_meta(connection_t *c, const char *buffer, int length) {
- cp();
+bool send_meta_sptps(void *handle, uint8_t type, const void *buffer, size_t length) {
+ (void)type;
- ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
- c->name, c->hostname);
+ assert(handle);
+ assert(buffer);
+ assert(length);
- /* Add our data to buffer */
- if(c->status.encryptout) {
- char outbuf[length];
- size_t outlen = length;
+ connection_t *c = handle;
+ meshlink_handle_t *mesh = c->mesh;
- if(!cipher_encrypt(&c->outcipher, buffer, length, outbuf, &outlen, false) || outlen != length) {
- logger(LOG_ERR, _("Error while encrypting metadata to %s (%s)"),
- c->name, c->hostname);
- return false;
- }
-
- ifdebug(META) logger(LOG_DEBUG, _("Encrypted write %p %p %p %d"), c, c->buffer, outbuf, length);
- bufferevent_write(c->buffer, (void *)outbuf, length);
- ifdebug(META) logger(LOG_DEBUG, _("Done."));
- } else {
- ifdebug(META) logger(LOG_DEBUG, _("Unencrypted write %p %p %p %d"), c, c->buffer, buffer, length);
- bufferevent_write(c->buffer, (void *)buffer, length);
- ifdebug(META) logger(LOG_DEBUG, _("Done."));
- }
+ buffer_add(&c->outbuf, (const char *)buffer, length);
+ io_set(&mesh->loop, &c->io, IO_READ | IO_WRITE);
return true;
}
-void broadcast_meta(connection_t *from, const char *buffer, int length) {
- splay_node_t *node;
- connection_t *c;
-
- cp();
+bool send_meta(meshlink_handle_t *mesh, connection_t *c, const char *buffer, int length) {
+ assert(c);
+ assert(buffer);
+ assert(length);
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
+ logger(mesh, MESHLINK_DEBUG, "Sending %d bytes of metadata to %s", length, c->name);
- if(c != from && c->status.active)
- send_meta(c, buffer, length);
+ if(c->allow_request == ID) {
+ buffer_add(&c->outbuf, buffer, length);
+ io_set(&mesh->loop, &c->io, IO_READ | IO_WRITE);
+ return true;
}
+
+ return sptps_send_record(&c->sptps, 0, buffer, length);
}
-bool receive_meta(connection_t *c) {
- size_t inlen;
- char inbuf[MAXBUFSIZE];
- char *bufp = inbuf, *endp;
+void broadcast_meta(meshlink_handle_t *mesh, connection_t *from, const char *buffer, int length) {
+ assert(buffer);
+ assert(length);
- cp();
+ for list_each(connection_t, c, mesh->connections)
+ if(c != from && c->status.active) {
+ send_meta(mesh, c, buffer, length);
+ }
+}
- /* Strategy:
- - Read as much as possible from the TCP socket in one go.
- - Decrypt it.
- - Check if a full request is in the input buffer.
- - If yes, process request and remove it from the buffer,
- then check again.
- - If not, keep stuff in buffer and exit.
- */
+void broadcast_submesh_meta(meshlink_handle_t *mesh, connection_t *from, submesh_t *s, const char *buffer, int length) {
+ assert(buffer);
+ assert(length);
- inlen = recv(c->socket, inbuf, sizeof inbuf, 0);
+ for list_each(connection_t, c, mesh->connections)
+ if(c != from && c->status.active) {
+ if(c->node && submesh_allows_node(s, c->node)) {
+ send_meta(mesh, c, buffer, length);
+ }
+ }
+}
- if(inlen <= 0) {
- logger(LOG_ERR, _("Receive callback called for %s (%s) but no data to receive: %s"), c->name, c->hostname, strerror(errno));
- return false;
- }
+bool receive_meta_sptps(void *handle, uint8_t type, const void *data, uint16_t length) {
+ assert(handle);
+ assert(!length || data);
- do {
- if(!c->status.decryptin) {
- endp = memchr(bufp, '\n', inlen);
- if(endp)
- endp++;
- else
- endp = bufp + inlen;
+ connection_t *c = handle;
+ meshlink_handle_t *mesh = c->mesh;
+ char *request = (char *)data;
- evbuffer_add(c->buffer->input, bufp, endp - bufp);
+ if(!c) {
+ logger(mesh, MESHLINK_ERROR, "receive_meta_sptps() called with NULL pointer!");
+ abort();
+ }
- inlen -= endp - bufp;
- bufp = endp;
+ if(type == SPTPS_HANDSHAKE) {
+ if(c->allow_request == ACK) {
+ return send_ack(mesh, c);
} else {
- size_t outlen = inlen;
- ifdebug(META) logger(LOG_DEBUG, _("Received encrypted %zu bytes"), inlen);
- evbuffer_expand(c->buffer->input, c->buffer->input->off + inlen);
+ return true;
+ }
+ }
- if(!cipher_decrypt(&c->incipher, bufp, inlen, c->buffer->input->buffer + c->buffer->input->off, &outlen, false) || inlen != outlen) {
- logger(LOG_ERR, _("Error while decrypting metadata from %s (%s)"),
- c->name, c->hostname);
- return false;
- }
- c->buffer->input->off += inlen;
+ if(!request) {
+ return true;
+ }
+
+ /* Are we receiving a TCPpacket? */
+
+ if(c->tcplen) {
+ abort(); // TODO: get rid of tcplen altogether
+ }
+
+ /* Change newline to null byte, just like non-SPTPS requests */
+
+ if(request[length - 1] == '\n') {
+ request[length - 1] = 0;
+ }
+
+ /* Otherwise we are waiting for a request */
+
+ return receive_request(mesh, c, request);
+}
+
+bool receive_meta(meshlink_handle_t *mesh, connection_t *c) {
+ int inlen;
+ char inbuf[MAXBUFSIZE];
- inlen = 0;
+ inlen = recv(c->socket, inbuf, sizeof(inbuf), 0);
+
+ if(inlen <= 0) {
+ if(!inlen || !errno) {
+ logger(mesh, MESHLINK_INFO, "Connection closed by %s", c->name);
+ } else if(sockwouldblock(sockerrno)) {
+ return true;
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Metadata socket read error for %s: %s", c->name, sockstrerror(sockerrno));
}
- while(c->buffer->input->off) {
- /* Are we receiving a TCPpacket? */
-
- if(c->tcplen) {
- if(c->tcplen <= c->buffer->input->off) {
- receive_tcppacket(c, (char *)c->buffer->input->buffer, c->tcplen);
- evbuffer_drain(c->buffer->input, c->tcplen);
- c->tcplen = 0;
- continue;
- } else {
- break;
- }
+ return false;
+ }
+
+ if(c->allow_request == ID) {
+ buffer_add(&c->inbuf, inbuf, inlen);
+
+ char *request = buffer_readline(&c->inbuf);
+
+ if(request) {
+ if(!receive_request(mesh, c, request) || c->allow_request == ID) {
+ return false;
}
- /* Otherwise we are waiting for a request */
+ int left = c->inbuf.len - c->inbuf.offset;
- char *request = evbuffer_readline(c->buffer->input);
- if(request) {
- bool result = receive_request(c, request);
- free(request);
- if(!result)
- return false;
- continue;
+ if(left > 0) {
+ return sptps_receive_data(&c->sptps, buffer_read(&c->inbuf, left), left);
} else {
- break;
+ return true;
}
}
- } while(inlen);
- c->last_ping_time = time(NULL);
+ if(c->inbuf.len >= sizeof(inbuf)) {
+ logger(mesh, MESHLINK_ERROR, "Input buffer full for %s", c->name);
+ return false;
+ } else {
+ return true;
+ }
+ }
- return true;
+ return sptps_receive_data(&c->sptps, inbuf, inlen);
}
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