/*
meta.c -- handle the meta communication
- Copyright (C) 2000-2005 Guus Sliepen <guus@tinc-vpn.org>,
- 2000-2005 Ivo Timmermans <ivo@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 <openssl/err.h>
-#include <openssl/evp.h>
-
-#include "avl_tree.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)
-{
- int outlen;
- int result;
+bool send_meta_sptps(void *handle, uint8_t type, const void *buffer, size_t length) {
+ (void)type;
- cp();
+ assert(handle);
+ assert(buffer);
+ assert(length);
- ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
- c->name, c->hostname);
+ connection_t *c = handle;
+ meshlink_handle_t *mesh = c->mesh;
- if(!c->outbuflen)
- c->last_flushed_time = now;
+ buffer_add(&c->outbuf, (const char *)buffer, length);
+ io_set(&mesh->loop, &c->io, IO_READ | IO_WRITE);
- /* Find room in connection's buffer */
- if(length + c->outbuflen > c->outbufsize) {
- c->outbufsize = length + c->outbuflen;
- c->outbuf = xrealloc(c->outbuf, c->outbufsize);
- }
+ return true;
+}
- if(length + c->outbuflen + c->outbufstart > c->outbufsize) {
- memmove(c->outbuf, c->outbuf + c->outbufstart, c->outbuflen);
- c->outbufstart = 0;
- }
+bool send_meta(meshlink_handle_t *mesh, connection_t *c, const char *buffer, int length) {
+ assert(c);
+ assert(buffer);
+ assert(length);
- /* Add our data to buffer */
- if(c->status.encryptout) {
- result = EVP_EncryptUpdate(c->outctx, (unsigned char *)c->outbuf + c->outbufstart + c->outbuflen,
- &outlen, (unsigned char *)buffer, length);
- if(!result || outlen < length) {
- logger(LOG_ERR, _("Error while encrypting metadata to %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
- return false;
- } else if(outlen > length) {
- logger(LOG_EMERG, _("Encrypted data too long! Heap corrupted!"));
- abort();
- }
- c->outbuflen += outlen;
- } else {
- memcpy(c->outbuf + c->outbufstart + c->outbuflen, buffer, length);
- c->outbuflen += length;
+ logger(mesh, MESHLINK_DEBUG, "Sending %d bytes of metadata to %s", length, c->name);
+
+ if(c->allow_request == ID) {
+ buffer_add(&c->outbuf, buffer, length);
+ io_set(&mesh->loop, &c->io, IO_READ | IO_WRITE);
+ return true;
}
- return true;
+ return sptps_send_record(&c->sptps, 0, buffer, length);
}
-bool flush_meta(connection_t *c)
-{
- int result;
-
- ifdebug(META) logger(LOG_DEBUG, _("Flushing %d bytes to %s (%s)"),
- c->outbuflen, c->name, c->hostname);
-
- while(c->outbuflen) {
- result = send(c->socket, c->outbuf + c->outbufstart, c->outbuflen, 0);
- if(result <= 0) {
- if(!errno || errno == EPIPE) {
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
- c->name, c->hostname);
- } else if(errno == EINTR) {
- continue;
- } else if(errno == EWOULDBLOCK) {
- ifdebug(CONNECTIONS) logger(LOG_DEBUG, _("Flushing %d bytes to %s (%s) would block"),
- c->outbuflen, c->name, c->hostname);
- return true;
- } else {
- logger(LOG_ERR, _("Flushing meta data to %s (%s) failed: %s"), c->name,
- c->hostname, strerror(errno));
- }
+void broadcast_meta(meshlink_handle_t *mesh, connection_t *from, const char *buffer, int length) {
+ assert(buffer);
+ assert(length);
- return false;
+ for list_each(connection_t, c, mesh->connections)
+ if(c != from && c->status.active) {
+ send_meta(mesh, c, buffer, length);
}
+}
- c->outbufstart += result;
- c->outbuflen -= result;
- }
+void broadcast_submesh_meta(meshlink_handle_t *mesh, connection_t *from, submesh_t *s, const char *buffer, int length) {
+ assert(buffer);
+ assert(length);
- c->outbufstart = 0; /* avoid unnecessary memmoves */
- return true;
+ 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);
+ }
+ }
}
-void broadcast_meta(connection_t *from, const char *buffer, int length)
-{
- avl_node_t *node;
- connection_t *c;
+bool receive_meta_sptps(void *handle, uint8_t type, const void *data, uint16_t length) {
+ assert(handle);
+ assert(!length || data);
- cp();
+ connection_t *c = handle;
+ meshlink_handle_t *mesh = c->mesh;
+ char *request = (char *)data;
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
+ if(!c) {
+ logger(mesh, MESHLINK_ERROR, "receive_meta_sptps() called with NULL pointer!");
+ abort();
+ }
- if(c != from && c->status.active)
- send_meta(c, buffer, length);
+ if(type == SPTPS_HANDSHAKE) {
+ if(c->allow_request == ACK) {
+ return send_ack(mesh, c);
+ } else {
+ return true;
+ }
}
-}
-bool receive_meta(connection_t *c)
-{
- int oldlen, i, result;
- int lenin, lenout, reqlen;
- bool decrypted = false;
- char inbuf[MAXBUFSIZE];
+ if(!request) {
+ return true;
+ }
+
+ /* Are we receiving a TCPpacket? */
- cp();
+ 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);
+}
- /* 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.
- */
+bool receive_meta(meshlink_handle_t *mesh, connection_t *c) {
+ int inlen;
+ char inbuf[MAXBUFSIZE];
- lenin = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 0);
+ inlen = recv(c->socket, inbuf, sizeof(inbuf), 0);
- if(lenin <= 0) {
- if(!lenin || !errno) {
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"),
- c->name, c->hostname);
- } else if(errno == EINTR)
+ if(inlen <= 0) {
+ if(!inlen || !errno) {
+ logger(mesh, MESHLINK_INFO, "Connection closed by %s", c->name);
+ } else if(sockwouldblock(sockerrno)) {
return true;
- else
- logger(LOG_ERR, _("Metadata socket read error for %s (%s): %s"),
- c->name, c->hostname, strerror(errno));
+ } else {
+ logger(mesh, MESHLINK_ERROR, "Metadata socket read error for %s: %s", c->name, sockstrerror(sockerrno));
+ }
return false;
}
- oldlen = c->buflen;
- c->buflen += lenin;
+ if(c->allow_request == ID) {
+ buffer_add(&c->inbuf, inbuf, inlen);
- while(lenin > 0) {
- /* Decrypt */
+ char *request = buffer_readline(&c->inbuf);
- if(c->status.decryptin && !decrypted) {
- result = EVP_DecryptUpdate(c->inctx, (unsigned char *)inbuf, &lenout, (unsigned char *)c->buffer + oldlen, lenin);
- if(!result || lenout != lenin) {
- logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"),
- c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ if(request) {
+ if(!receive_request(mesh, c, request) || c->allow_request == ID) {
return false;
}
- memcpy(c->buffer + oldlen, inbuf, lenin);
- decrypted = true;
- }
- /* Are we receiving a TCPpacket? */
+ int left = c->inbuf.len - c->inbuf.offset;
- if(c->tcplen) {
- if(c->tcplen <= c->buflen) {
- receive_tcppacket(c, c->buffer, c->tcplen);
-
- c->buflen -= c->tcplen;
- lenin -= c->tcplen - oldlen;
- memmove(c->buffer, c->buffer + c->tcplen, c->buflen);
- oldlen = 0;
- c->tcplen = 0;
- continue;
+ if(left > 0) {
+ return sptps_receive_data(&c->sptps, buffer_read(&c->inbuf, left), left);
} else {
- break;
- }
- }
-
- /* Otherwise we are waiting for a request */
-
- reqlen = 0;
-
- for(i = oldlen; i < c->buflen; i++) {
- if(c->buffer[i] == '\n') {
- c->buffer[i] = '\0'; /* replace end-of-line by end-of-string so we can use sscanf */
- reqlen = i + 1;
- break;
+ return true;
}
}
- if(reqlen) {
- c->reqlen = reqlen;
- if(!receive_request(c))
- return false;
-
- c->buflen -= reqlen;
- lenin -= reqlen - oldlen;
- memmove(c->buffer, c->buffer + reqlen, c->buflen);
- oldlen = 0;
- continue;
+ if(c->inbuf.len >= sizeof(inbuf)) {
+ logger(mesh, MESHLINK_ERROR, "Input buffer full for %s", c->name);
+ return false;
} else {
- break;
+ return true;
}
}
- if(c->buflen >= MAXBUFSIZE) {
- logger(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"),
- c->name, c->hostname);
- return false;
- }
-
- c->last_ping_time = now;
-
- return true;
+ return sptps_receive_data(&c->sptps, inbuf, inlen);
}
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