/*
meta.c -- handle the meta communication
- Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
- 2000 Ivo Timmermans <itimmermans@bigfoot.com>
+ Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.eu.org>,
+ 2000-2002 Ivo Timmermans <ivo@o2w.nl>
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 1.1.2.12 2000/11/20 19:12:12 guus Exp $
+ $Id: meta.c,v 1.1.2.27 2002/09/04 16:26:44 guus Exp $
*/
#include "config.h"
#include <utils.h>
+#include <avl_tree.h>
#include <errno.h>
#include <syslog.h>
-#include <sys/signal.h>
#include <unistd.h>
#include <string.h>
/* This line must be below the rest for FreeBSD */
+#include <sys/types.h>
#include <sys/socket.h>
-#ifdef HAVE_OPENSSL_EVP_H
-# include <openssl/evp.h>
-#else
-# include <evp.h>
-#endif
+#include <openssl/evp.h>
#include "net.h"
#include "connection.h"
#include "system.h"
#include "protocol.h"
-int send_meta(connection_t *cl, char *buffer, int length)
+int send_meta(connection_t *c, char *buffer, int length)
{
- char outbuf[MAXBUFSIZE];
char *bufp;
int outlen;
+ char outbuf[MAXBUFSIZE];
cp
if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s): %s"), length,
- cl->name, cl->hostname, buffer);
-
- buffer[length-1]='\n';
+ syslog(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length,
+ c->name, c->hostname);
- if(cl->status.encryptout)
+ if(c->status.encryptout)
{
- EVP_EncryptUpdate(cl->cipher_outctx, outbuf, &outlen, buffer, length);
+ EVP_EncryptUpdate(c->outctx, outbuf, &outlen, buffer, length);
bufp = outbuf;
length = outlen;
}
else
bufp = buffer;
- if(write(cl->meta_socket, bufp, length) < 0)
+ if(write(c->socket, bufp, length) < 0)
{
- syslog(LOG_ERR, _("Sending meta data to %s (%s) failed: %m"), cl->name, cl->hostname);
+ 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 *cl, char *buffer, int length)
+void broadcast_meta(connection_t *from, char *buffer, int length)
{
- rbl_t *rbl;
- connection_t *p;
+ avl_node_t *node;
+ connection_t *c;
cp
- RBL_FOREACH(connection_tree, rbl)
+ for(node = connection_tree->head; node; node = node->next)
{
- p = (connection_t *)rbl->data;
- if(p != cl && p->status.meta && p->status.active)
- send_meta(p, buffer, length);
+ c = (connection_t *)node->data;
+ if(c != from && c->status.active)
+ send_meta(c, buffer, length);
}
cp
}
-int receive_meta(connection_t *cl)
+int receive_meta(connection_t *c)
{
int x, l = sizeof(x);
int oldlen, i;
- int lenin = 0;
+ int lenin, reqlen;
+ int decrypted = 0;
char inbuf[MAXBUFSIZE];
- char *bufp;
cp
- if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
+ if(getsockopt(c->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);
+ 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"),
- cl->name, cl->hostname, strerror(x));
+ c->name, c->hostname, strerror(x));
return -1;
}
- if(cl->status.decryptin)
- bufp = inbuf;
- else
- bufp = cl->buffer + cl->buflen;
+ /* 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(cl->meta_socket, bufp, MAXBUFSIZE - cl->buflen);
+ lenin = read(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen);
if(lenin<=0)
{
- if(errno==EINTR)
- return 0;
- if(errno==0)
+ if(lenin==0)
{
if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Connection closed by %s (%s)"),
- cl->name, cl->hostname);
+ c->name, c->hostname);
}
else
- syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %m"),
- cl->name, cl->hostname);
+ 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(cl->status.decryptin)
+ oldlen = c->buflen;
+ c->buflen += lenin;
+
+ while(lenin)
{
- EVP_DecryptUpdate(cl->cipher_inctx, cl->buffer + cl->buflen, &lenin, inbuf, lenin);
- }
+ /* Decrypt */
- oldlen = cl->buflen;
- cl->buflen += lenin;
+ if(c->status.decryptin && !decrypted)
+ {
+ EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin);
+ memcpy(c->buffer + oldlen, inbuf, lenin);
+ decrypted = 1;
+ }
- for(;;)
- {
- cl->reqlen = 0;
+ /* Are we receiving a TCPpacket? */
- for(i = oldlen; i < cl->buflen; i++)
+ if(c->tcplen)
{
- if(cl->buffer[i] == '\n')
+ if(c->tcplen <= c->buflen)
+ {
+ receive_tcppacket(c, c->buffer, c->tcplen);
+
+ c->buflen -= c->tcplen;
+ lenin -= c->tcplen;
+ memmove(c->buffer, c->buffer + c->tcplen, c->buflen);
+ oldlen = 0;
+ c->tcplen = 0;
+ continue;
+ }
+ else
{
- 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)
+ /* Otherwise we are waiting for a request */
+
+ reqlen = 0;
+
+ for(i = oldlen; i < c->buflen; i++)
{
- if(debug_lvl >= DEBUG_META)
- syslog(LOG_DEBUG, _("Got request from %s (%s): %s"),
- cl->name, cl->hostname, cl->buffer);
+ 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(receive_request(cl))
+ if(reqlen)
+ {
+ c->reqlen = reqlen;
+ if(receive_request(c))
return -1;
- cl->buflen -= cl->reqlen;
- memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
+ c->buflen -= reqlen;
+ lenin -= reqlen;
+ memmove(c->buffer, c->buffer + reqlen, c->buflen);
oldlen = 0;
+ continue;
}
else
{
}
}
- if(cl->buflen >= MAXBUFSIZE)
+ if(c->buflen >= MAXBUFSIZE)
{
syslog(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"),
- cl->name, cl->hostname);
+ c->name, c->hostname);
return -1;
}
- cl->last_ping_time = time(NULL);
+ c->last_ping_time = now;
cp
return 0;
}
projects / tinc / blobdiff