+/*
+ meta.c -- handle the meta communication
+ Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
+ 2000 Ivo Timmermans <itimmermans@bigfoot.com>
+
+ 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
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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: meta.c,v 1.1.2.1 2000/09/26 14:06:03 guus Exp $
+*/
+
+#include "config.h"
+
+int send_meta(conn_list_t *cl, const char *buffer, int length)
+{
+ char outbuf[MAXBUFSIZE];
+ char *bufp;
+cp
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s): %s"), int length,
+ cl->name, cl->hostname, buffer);
+
+ if(cl->status.encryptout)
+ {
+ if(EVP_EncryptUpdate(cl->cipher_outctx, cl->buffer + cl->buflen, NULL, inbuf, length) != 1)
+ {
+ syslog(LOG_ERR, _("Error during encryption of outgoing metadata to %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
+ bufp = outbuf;
+ }
+ else
+ bufp = buffer;
+
+ if(write(cl->meta_socket, bufp, length) < 0)
+ {
+ syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %m"), cl->name, cl->hostname);
+ return -1;
+ }
+cp
+ return 0;
+}
+
+int broadcast_meta(conn_list_t *cl, const char *buffer, int length)
+{
+ conn_list_t *p;
+cp
+ for(p = conn_list; p != NULL; p = p->next)
+ if(p != cl && p->status.meta && p->status.active)
+ send_meta(p, buffer, length);
+cp
+ return 0;
+}
+
+int receive_meta(conn_list_t *cl)
+{
+ int x, l = sizeof(x);
+ int oldlen, i;
+ int lenin = 0;
+ char inbuf[MAXBUFSIZE];
+ char *bufp;
+cp
+ if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
+ {
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, cl->meta_socket,
+ cl->name, cl->hostname);
+ return -1;
+ }
+ if(x)
+ {
+ syslog(LOG_ERR, _("Metadata socket error for %s (%s): %s"),
+ cl->name, cl->hostname, strerror(x));
+ return -1;
+ }
+
+ if(cl->status.encryptin)
+ bufp = inbuf;
+ else
+ bufp = cl->buffer + cl->buflen;
+
+ lenin = read(cl->meta_socket, bufp, MAXBUFSIZE - cl->buflen);
+
+ if(lenin<=0)
+ {
+ if(errno==EINTR)
+ return 0;
+ if(errno==0)
+ {
+ if(debug_lvl>DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Connection closed by %s (%s)"),
+ cl->name, cl->hostname);
+ }
+ else
+ syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %m"),
+ cl->name, cl->hostname);
+ return -1;
+ }
+
+ if(cl->status.decryptin)
+ {
+ if(EVP_DecryptUpdate(cl->cipher_inctx, cl->buffer + cl->buflen, NULL, inbuf, lenin) != 1)
+ {
+ syslog(LOG_ERR, _("Error during decryption of incoming metadata from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
+ }
+
+ oldlen = cl->buflen;
+ cl->buflen += lenin;
+
+ for(;;)
+ {
+ cl->reqlen = 0;
+
+ for(i = oldlen; i < cl->buflen; i++)
+ {
+ if(cl->buffer[i] == '\n')
+ {
+ cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */
+ cl->reqlen = i + 1;
+ break;
+ }
+ }
+
+ if(cl->reqlen)
+ {
+ if(debug_lvl > DEBUG_META)
+ syslog(LOG_DEBUG, _("Got request from %s (%s): %s"),
+ cl->name, cl->hostname, cl->buffer);
+
+ if(receive_request(cl))
+ return -1;
+
+ cl->buflen -= cl->reqlen;
+ memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
+ oldlen = 0;
+ }
+ else
+ {
+ break;
+ }
+ }
+
+ if(cl->buflen >= MAXBUFSIZE)
+ {
+ syslog(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
+ }
+
+ cl->last_ping_time = time(NULL);
+ cl->want_ping = 0;
+cp
+ return 0;
+}
projects / tinc / commitdiff