--- /dev/null
+/*
+ meta.c -- handle the meta communication
+ Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.warande.net>,
+ 2000-2002 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 2002/04/28 12:46:26 zarq Exp $
+*/
+
+#include "config.h"
+#include <utils.h>
+#include <avl_tree.h>
+
+#include <errno.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 "net.h"
+#include "connection.h"
+#include "interface.h"
+#include "system.h"
+#include "protocol.h"
+#include "logging.h"
+
+int send_meta(connection_t *c, char *buffer, int length)
+{
+ char *bufp;
+ int outlen;
+ char outbuf[MAXBUFSIZE];
+cp
+ log(DEBUG_META, TLOG_DEBUG,
+ _("Sending %d bytes of metadata to %s (%s)"),
+ length, c->name, c->hostname);
+
+ if(c->status.encryptout)
+ {
+ EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
+ bufp = outbuf;
+ length = outlen;
+ }
+ else
+ bufp = buffer;
+
+ if(write(c->socket, bufp, length) < 0)
+ {
+ syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name, c->hostname, strerror(errno));
+ return -1;
+ }
+cp
+ return 0;
+}
+
+void broadcast_meta(connection_t *from, char *buffer, int length)
+{
+ avl_node_t *node;
+ connection_t *c;
+cp
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ c = (connection_t *)node->data;
+ if(c != from && c->status.active)
+ send_meta(c, buffer, length);
+ }
+cp
+}
+
+int receive_meta(connection_t *c)
+{
+ int x, l = sizeof(x);
+ int oldlen, i;
+ int lenin, reqlen;
+ int decrypted = 0;
+ char inbuf[MAXBUFSIZE];
+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.
+ - 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.
+ */
+
+ lenin = read(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen);
+
+ 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;
+ }
+
+ 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;
+ }
+
+ /* 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;
+ }
+ }
+
+ if(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;
+cp
+ return 0;
+}