/* meta.c -- handle the meta communication Copyright (C) 2000-2003 Guus Sliepen , 2000-2003 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 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 1.1.2.50 2003/11/17 15:30:17 guus Exp $ */ #include "system.h" #include #include #include "avl_tree.h" #include "connection.h" #include "logger.h" #include "meta.h" #include "net.h" #include "protocol.h" #include "system.h" #include "utils.h" bool send_meta(connection_t *c, const char *buffer, int length) { const char *bufp; int outlen; char outbuf[MAXBUFSIZE]; int result; cp(); ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length, c->name, c->hostname); if(c->status.encryptout) { result = EVP_EncryptUpdate(c->outctx, outbuf, &outlen, 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; } bufp = outbuf; length = outlen; } else bufp = buffer; while(length) { result = send(c->socket, bufp, length, 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 logger(LOG_ERR, _("Sending meta data to %s (%s) failed: %s"), c->name, c->hostname, strerror(errno)); return false; } bufp += result; length -= result; } return true; } void broadcast_meta(connection_t *from, const char *buffer, int length) { avl_node_t *node; connection_t *c; cp(); for(node = connection_tree->head; node; node = node->next) { c = node->data; if(c != from && c->status.active) send_meta(c, buffer, length); } } bool receive_meta(connection_t *c) { int oldlen, i, result; int lenin, lenout, reqlen; bool decrypted = false; char inbuf[MAXBUFSIZE]; cp(); /* 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 = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 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) return true; else logger(LOG_ERR, _("Metadata socket read error for %s (%s): %s"), c->name, c->hostname, strerror(errno)); return false; } oldlen = c->buflen; c->buflen += lenin; while(lenin > 0) { /* Decrypt */ if(c->status.decryptin && !decrypted) { result = EVP_DecryptUpdate(c->inctx, inbuf, &lenout, 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)); return false; } memcpy(c->buffer + oldlen, inbuf, lenin); decrypted = true; } /* Are we receiving a TCPpacket? */ 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; } 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; } } 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; } else { break; } } 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; }