/*
meta.c -- handle the meta communication
- Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.eu.org>,
- 2000-2002 Ivo Timmermans <ivo@o2w.nl>
+ Copyright (C) 2000-2006 Guus Sliepen <guus@tinc-vpn.org>,
+ 2000-2005 Ivo Timmermans
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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: meta.c,v 1.1.2.33 2003/03/19 11:45:05 guus Exp $
+ $Id$
*/
-#include "config.h"
-#include <utils.h>
-#include <avl_tree.h>
-
-#include <errno.h>
-#include <syslog.h>
-#include <unistd.h>
-#include <string.h>
-/* This line must be below the rest for FreeBSD */
-#include <sys/types.h>
-#include <sys/socket.h>
-
-#include <openssl/evp.h>
+#include "system.h"
-#include "net.h"
+#include "splay_tree.h"
+#include "cipher.h"
#include "connection.h"
-#include "system.h"
+#include "logger.h"
+#include "meta.h"
+#include "net.h"
#include "protocol.h"
+#include "utils.h"
+#include "xalloc.h"
-int send_meta(connection_t *c, char *buffer, int length)
-{
- char *bufp;
- int outlen;
- char outbuf[MAXBUFSIZE];
- int result;
-
+bool send_meta(connection_t *c, const char *buffer, int length) {
cp();
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
+ ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
c->name, c->hostname);
+ /* Add our data to buffer */
if(c->status.encryptout) {
- EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
- bufp = outbuf;
- length = outlen;
- } else
- bufp = buffer;
-
- while(length) {
- result = write(c->socket, bufp, length);
- if(result <= 0) {
- if(errno == EINTR)
- continue;
- syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name,
- c->hostname, strerror(errno));
- return -1;
+ char outbuf[length];
+ size_t outlen = length;
+
+ 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;
}
- bufp += result;
- length -= result;
+
+ 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."));
}
-
- return 0;
+
+ return true;
}
-void broadcast_meta(connection_t *from, char *buffer, int length)
-{
- avl_node_t *node;
+void broadcast_meta(connection_t *from, const char *buffer, int length) {
+ splay_node_t *node;
connection_t *c;
cp();
for(node = connection_tree->head; node; node = node->next) {
- c = (connection_t *) node->data;
+ c = node->data;
if(c != from && c->status.active)
send_meta(c, buffer, length);
}
}
-int receive_meta(connection_t *c)
-{
- int x;
- socklen_t l = sizeof(x);
- int oldlen, i;
- int lenin, reqlen;
- int decrypted = 0;
+bool receive_meta(connection_t *c) {
+ size_t inlen;
char inbuf[MAXBUFSIZE];
+ char *bufp = inbuf, *endp;
cp();
- if(getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) {
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%s %s (%s)"), __FILE__,
- __LINE__, c->socket, strerror(errno), c->name, c->hostname);
- return -1;
- }
-
- if(x) {
- syslog(LOG_ERR, _("Metadata socket error for %s (%s): %s"),
- c->name, c->hostname, strerror(x));
- return -1;
- }
-
/* Strategy:
- Read as much as possible from the TCP socket in one go.
- Decrypt it.
- If not, keep stuff in buffer and exit.
*/
- lenin = read(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen);
+ inlen = recv(c->socket, inbuf, sizeof inbuf, 0);
- if(lenin <= 0) {
- if(lenin == 0) {
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Connection closed by %s (%s)"),
- c->name, c->hostname);
- } else if(errno == EINTR)
- return 0;
- else
- syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %s"),
- c->name, c->hostname, strerror(errno));
-
- return -1;
+ 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;
}
- oldlen = c->buflen;
- c->buflen += lenin;
-
- while(lenin) {
- /* Decrypt */
-
- if(c->status.decryptin && !decrypted) {
- EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin);
- memcpy(c->buffer + oldlen, inbuf, lenin);
- decrypted = 1;
- }
+ do {
+ if(!c->status.decryptin) {
+ endp = memchr(bufp, '\n', inlen);
+ if(endp)
+ endp++;
+ else
+ endp = bufp + inlen;
- /* Are we receiving a TCPpacket? */
+ evbuffer_add(c->buffer->input, bufp, endp - bufp);
- if(c->tcplen) {
- if(c->tcplen <= c->buflen) {
- receive_tcppacket(c, c->buffer, c->tcplen);
+ inlen -= endp - bufp;
+ bufp = endp;
+ } 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);
- c->buflen -= c->tcplen;
- lenin -= c->tcplen;
- memmove(c->buffer, c->buffer + c->tcplen, c->buflen);
- oldlen = 0;
- c->tcplen = 0;
- continue;
- } else {
- break;
+ 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;
+
+ inlen = 0;
}
- /* Otherwise we are waiting for a request */
+ 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;
+ }
+ }
- reqlen = 0;
+ /* Otherwise we are waiting for a request */
- 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;
+ char *request = evbuffer_readline(c->buffer->input);
+ if(request) {
+ bool result = receive_request(c, request);
+ free(request);
+ if(!result)
+ return false;
+ continue;
+ } else {
break;
}
}
+ } while(inlen);
- if(reqlen) {
- c->reqlen = reqlen;
- if(receive_request(c))
- return -1;
-
- c->buflen -= reqlen;
- lenin -= reqlen;
- memmove(c->buffer, c->buffer + reqlen, c->buflen);
- oldlen = 0;
- continue;
- } else {
- break;
- }
- }
-
- if(c->buflen >= MAXBUFSIZE) {
- syslog(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"),
- c->name, c->hostname);
- return -1;
- }
-
- c->last_ping_time = now;
+ c->last_ping_time = time(NULL);
- return 0;
+ return true;
}
projects / tinc / blobdiff