X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fmeta.c;h=7562792e2f4aa83da535ac2277f97976eec97248;hp=c2fbd7edaa921830c9941eef7674c16149081f78;hb=ff306f0cdaedb50de1472e7c1fb55de922a6ca60;hpb=9bde92ce97d5503ff2d31dcc6f0648902580ec14 diff --git a/src/meta.c b/src/meta.c index c2fbd7ed..7562792e 100644 --- a/src/meta.c +++ b/src/meta.c @@ -1,7 +1,8 @@ /* meta.c -- handle the meta communication - Copyright (C) 2000-2003 Guus Sliepen , - 2000-2003 Ivo Timmermans + Copyright (C) 2000-2009 Guus Sliepen , + 2000-2005 Ivo Timmermans + 2006 Scott Lamb 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 @@ -13,102 +14,115 @@ 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 1.1.2.40 2003/08/08 22:11:54 guus Exp $ + 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., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "system.h" -#include - -#include "avl_tree.h" +#include "cipher.h" #include "connection.h" #include "logger.h" +#include "meta.h" #include "net.h" #include "protocol.h" -#include "system.h" #include "utils.h" +#include "xalloc.h" + +bool send_meta_sptps(void *handle, uint8_t type, const char *buffer, size_t length) { + connection_t *c = handle; -bool send_meta(connection_t *c, char *buffer, int length) -{ - char *bufp; - int outlen; - char outbuf[MAXBUFSIZE]; - int result; + if(!c) { + logger(DEBUG_ALWAYS, LOG_ERR, "send_meta_sptps() called with NULL pointer!"); + abort(); + } + + buffer_add(&c->outbuf, buffer, length); + event_add(&c->outevent, NULL); + + return true; +} - cp(); +bool send_meta(connection_t *c, const char *buffer, int length) { + if(!c) { + logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!"); + abort(); + } - ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length, + logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length, c->name, c->hostname); + if(c->protocol_minor >= 2) + return sptps_send_record(&c->sptps, 0, buffer, length); + + /* 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 = 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)); + size_t outlen = length; + + if(!cipher_encrypt(&c->outcipher, buffer, length, buffer_prepare(&c->outbuf, length), &outlen, false) || outlen != length) { + logger(DEBUG_ALWAYS, LOG_ERR, "Error while encrypting metadata to %s (%s)", + c->name, c->hostname); return false; } - bufp += result; - length -= result; + + } else { + buffer_add(&c->outbuf, buffer, length); } - - return true; -} -void broadcast_meta(connection_t *from, char *buffer, int length) -{ - avl_node_t *node; - connection_t *c; + event_add(&c->outevent, NULL); - cp(); + return true; +} - for(node = connection_tree->head; node; node = node->next) { - c = (connection_t *) node->data; +void broadcast_meta(connection_t *from, const char *buffer, int length) { + for(list_node_t *node = connection_list->head, *next; node; node = next) { + next = node->next; + connection_t *c = node->data; if(c != from && c->status.active) send_meta(c, buffer, length); } } -bool receive_meta(connection_t *c) -{ - int x; - socklen_t l = sizeof(x); - int oldlen, i; - int lenin, reqlen; - bool decrypted = false; - char inbuf[MAXBUFSIZE]; +bool receive_meta_sptps(void *handle, uint8_t type, const char *data, uint16_t length) { + connection_t *c = handle; - cp(); + if(!c) { + logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!"); + abort(); + } - if(getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0) { - logger(LOG_ERR, _("This is a bug: %s:%d: %d:%s %s (%s)"), __FILE__, - __LINE__, c->socket, strerror(errno), c->name, c->hostname); - return false; + if(type == SPTPS_HANDSHAKE) { + if(c->allow_request == ACK) + return send_ack(c); + else + return true; } - if(x) { - logger(LOG_ERR, _("Metadata socket error for %s (%s): %s"), - c->name, c->hostname, strerror(x)); - return false; + if(!data) + return true; + + /* Are we receiving a TCPpacket? */ + + if(c->tcplen) { + if(length != c->tcplen) + return false; + receive_tcppacket(c, data, length); + c->tcplen = 0; + return true; } + /* Otherwise we are waiting for a request */ + + return receive_request(c, data); +} + +bool receive_meta(connection_t *c) { + int inlen; + char inbuf[MAXBUFSIZE]; + char *bufp = inbuf, *endp; + /* Strategy: - Read as much as possible from the TCP socket in one go. - Decrypt it. @@ -118,84 +132,89 @@ bool receive_meta(connection_t *c) - If not, keep stuff in buffer and exit. */ - lenin = recv(c->socket, c->buffer + c->buflen, MAXBUFSIZE - c->buflen, 0); + buffer_compact(&c->inbuf, MAXBUFSIZE); + + if(sizeof inbuf <= c->inbuf.len) { + logger(DEBUG_ALWAYS, LOG_ERR, "Input buffer full for %s (%s)", c->name, c->hostname); + return false; + } + + inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0); - if(lenin <= 0) { - if(!lenin || !errno) { - ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"), + if(inlen <= 0) { + if(!inlen || !errno) { + logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname); - } else if(errno == EINTR) + } else if(sockwouldblock(sockerrno)) return true; else - logger(LOG_ERR, _("Metadata socket read error for %s (%s): %s"), - c->name, c->hostname, strerror(errno)); - + logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s", + c->name, c->hostname, sockstrerror(sockerrno)); return false; } - oldlen = c->buflen; - c->buflen += lenin; - - while(lenin) { - /* Decrypt */ + do { + if(c->protocol_minor >= 2) + return sptps_receive_data(&c->sptps, bufp, inlen); - if(c->status.decryptin && !decrypted) { - EVP_DecryptUpdate(c->inctx, inbuf, &lenin, c->buffer + oldlen, lenin); - memcpy(c->buffer + oldlen, inbuf, lenin); - decrypted = true; - } + if(!c->status.decryptin) { + endp = memchr(bufp, '\n', inlen); + if(endp) + endp++; + else + endp = bufp + inlen; - /* Are we receiving a TCPpacket? */ + buffer_add(&c->inbuf, 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; - 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, buffer_prepare(&c->inbuf, inlen), &outlen, false) || inlen != outlen) { + logger(DEBUG_ALWAYS, LOG_ERR, "Error while decrypting metadata from %s (%s)", + c->name, c->hostname); + return false; } + + inlen = 0; } - /* Otherwise we are waiting for a request */ + while(c->inbuf.len) { + /* Are we receiving a TCPpacket? */ + + if(c->tcplen) { + char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen); + if(tcpbuffer) { + if(proxytype == PROXY_SOCKS4 && c->allow_request == ID) { + if(tcpbuffer[0] == 0 && tcpbuffer[1] == 0x5a) { + logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted"); + } else { + logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected"); + return false; + } + } else + receive_tcppacket(c, tcpbuffer, 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 = buffer_readline(&c->inbuf); + if(request) { + bool result = receive_request(c, request); + if(!result) + return false; + continue; + } else { break; } } - - if(reqlen) { - c->reqlen = reqlen; - if(!receive_request(c)) - return false; - - c->buflen -= reqlen; - lenin -= reqlen; - 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; + } while(inlen); return true; }