X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fmeta.c;h=260cb005051ff9cf6ab33473fe22d1e5a5308552;hb=d4410d0cce40929db9a0ce7042ef962f1867234d;hp=73ffa69b42baae542b751e1f8478fbcad2224c14;hpb=f0aa9641e82fb6e09c1e485366d14dddaa7f7c36;p=tinc diff --git a/src/meta.c b/src/meta.c index 73ffa69b..260cb005 100644 --- a/src/meta.c +++ b/src/meta.c @@ -1,7 +1,8 @@ /* meta.c -- handle the meta communication - Copyright (C) 2000-2002 Guus Sliepen , - 2000-2002 Ivo Timmermans + Copyright (C) 2000-2014 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 @@ -13,198 +14,288 @@ 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 1.1.2.22 2002/02/10 21:57:54 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 "config.h" -#include -#include - -#include -#include -#include -#include -#include -/* This line must be below the rest for FreeBSD */ -#include - -#include +#include "system.h" -#include "net.h" +#include "cipher.h" #include "connection.h" -#include "system.h" +#include "logger.h" +#include "meta.h" +#include "net.h" #include "protocol.h" +#include "utils.h" +#include "xalloc.h" + +#ifndef MIN +#define MIN(x, y) (((x)<(y))?(x):(y)) +#endif -int send_meta(connection_t *c, char *buffer, int length) -{ - char *bufp; - int outlen; - char outbuf[MAXBUFSIZE]; -cp - if(debug_lvl >= DEBUG_META) - syslog(LOG_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: %m"), c->name, c->hostname); - return -1; - } -cp - return 0; +bool send_meta_sptps(void *handle, uint8_t type, const void *buffer, size_t length) { + connection_t *c = handle; + + if(!c) { + logger(DEBUG_ALWAYS, LOG_ERR, "send_meta_sptps() called with NULL pointer!"); + abort(); + } + + buffer_add(&c->outbuf, buffer, length); + io_set(&c->io, IO_READ | IO_WRITE); + + return true; } -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 +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(); + } + + 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) { +#ifdef DISABLE_LEGACY + return false; +#else + 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; + } +#endif + } else { + buffer_add(&c->outbuf, buffer, length); + } + + io_set(&c->io, IO_READ | IO_WRITE); + + return true; +} + +void send_meta_raw(connection_t *c, const char *buffer, int length) { + if(!c) { + logger(DEBUG_ALWAYS, LOG_ERR, "send_meta() called with NULL pointer!"); + abort(); + } + + logger(DEBUG_META, LOG_DEBUG, "Sending %d bytes of raw metadata to %s (%s)", length, + c->name, c->hostname); + + buffer_add(&c->outbuf, buffer, length); + + io_set(&c->io, IO_READ | IO_WRITE); +} + +void broadcast_meta(connection_t *from, const char *buffer, int length) { + for list_each(connection_t, c, connection_list) + if(c != from && c->edge) + send_meta(c, buffer, length); +} + +bool receive_meta_sptps(void *handle, uint8_t type, const void *vdata, uint16_t length) { + const char *data = vdata; + connection_t *c = handle; + + if(!c) { + logger(DEBUG_ALWAYS, LOG_ERR, "receive_meta_sptps() called with NULL pointer!"); + abort(); + } + + if(type == SPTPS_HANDSHAKE) { + if(c->allow_request == ACK) + return send_ack(c); + else + return true; + } + + 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; + } + + /* Change newline to null byte, just like non-SPTPS requests */ + + if(data[length - 1] == '\n') + ((char *)data)[length - 1] = 0; + + /* Otherwise we are waiting for a request */ + + return receive_request(c, data); } -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:%m %s (%s)"), __FILE__, __LINE__, c->socket, - 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): %m"), - c->name, c->hostname); - - 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; - } - - /* 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; - 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) - { - 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 = time(NULL); -cp - return 0; +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. + - 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. + */ + + 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(inlen <= 0) { + if(!inlen || !sockerrno) { + logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", + c->name, c->hostname); + } else if(sockwouldblock(sockerrno)) + return true; + else + logger(DEBUG_ALWAYS, LOG_ERR, "Metadata socket read error for %s (%s): %s", + c->name, c->hostname, sockstrerror(sockerrno)); + return false; + } + + do { + /* Are we receiving a SPTPS packet? */ + + if(c->sptpslen) { + int len = MIN(inlen, c->sptpslen - c->inbuf.len); + buffer_add(&c->inbuf, bufp, len); + + char *sptpspacket = buffer_read(&c->inbuf, c->sptpslen); + if(!sptpspacket) + return true; + + if(!receive_tcppacket_sptps(c, sptpspacket, c->sptpslen)) + return false; + c->sptpslen = 0; + + bufp += len; + inlen -= len; + continue; + } + + if(c->protocol_minor >= 2) { + int len = sptps_receive_data(&c->sptps, bufp, inlen); + if(!len) + return false; + bufp += len; + inlen -= len; + continue; + } + + if(!c->status.decryptin) { + endp = memchr(bufp, '\n', inlen); + if(endp) + endp++; + else + endp = bufp + inlen; + + buffer_add(&c->inbuf, bufp, endp - bufp); + + inlen -= endp - bufp; + bufp = endp; + } else { +#ifdef DISABLE_LEGACY + return false; +#else + size_t outlen = inlen; + + 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; +#endif + } + + while(c->inbuf.len) { + /* Are we receiving a TCPpacket? */ + + if(c->tcplen) { + char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen); + if(!tcpbuffer) + break; + + if(!c->node) { + if(c->outgoing && 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 if(c->outgoing && proxytype == PROXY_SOCKS5 && c->allow_request == ID) { + if(tcpbuffer[0] != 5) { + logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server"); + return false; + } + if(tcpbuffer[1] == (char)0xff) { + logger(DEBUG_CONNECTIONS, LOG_ERR, "Proxy request rejected: unsuitable authentication method"); + return false; + } + if(tcpbuffer[2] != 5) { + logger(DEBUG_CONNECTIONS, LOG_ERR, "Invalid response from proxy server"); + return false; + } + if(tcpbuffer[3] == 0) { + logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request granted"); + } else { + logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Proxy request rejected"); + return false; + } + } else { + logger(DEBUG_CONNECTIONS, LOG_ERR, "c->tcplen set but c->node is NULL!"); + abort(); + } + } else { + if(c->allow_request == ALL) { + receive_tcppacket(c, tcpbuffer, c->tcplen); + } else { + logger(DEBUG_CONNECTIONS, LOG_ERR, "Got unauthorized TCP packet from %s (%s)", c->name, c->hostname); + return false; + } + } + + c->tcplen = 0; + } + + /* Otherwise we are waiting for a request */ + + char *request = buffer_readline(&c->inbuf); + if(request) { + bool result = receive_request(c, request); + if(!result) + return false; + continue; + } else { + break; + } + } + } while(inlen); + + return true; }