X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fmeta.c;h=e60c127a82ad6123542d73f636dde6099a08ce83;hp=77203f60c62f7209f7311ec30921b72aaec4265d;hb=4590ab63d93b1dd6e7df019b592f6dabc02a0f96;hpb=af95368c0f30955f0e13b587d5d6d4989fd5a83e diff --git a/src/meta.c b/src/meta.c index 77203f60..e60c127a 100644 --- a/src/meta.c +++ b/src/meta.c @@ -1,7 +1,8 @@ /* meta.c -- handle the meta communication - Copyright (C) 2000-2005 Guus Sliepen , - 2000-2005 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 @@ -13,11 +14,9 @@ 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. - - $Id$ + 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" @@ -34,14 +33,16 @@ #include "utils.h" #include "xalloc.h" -bool send_meta(connection_t *c, const char *buffer, int length) -{ +bool send_meta(connection_t *c, const char *buffer, int length) { int outlen; int result; - cp(); + if(!c) { + logger(LOG_ERR, "send_meta() called with NULL pointer!"); + abort(); + } - ifdebug(META) logger(LOG_DEBUG, _("Sending %d bytes of metadata to %s (%s)"), length, + ifdebug(META) logger(LOG_DEBUG, "Sending %d bytes of metadata to %s (%s)", length, c->name, c->hostname); if(!c->outbuflen) @@ -63,11 +64,11 @@ bool send_meta(connection_t *c, const char *buffer, int length) result = EVP_EncryptUpdate(c->outctx, (unsigned char *)c->outbuf + c->outbufstart + c->outbuflen, &outlen, (unsigned char *)buffer, length); if(!result || outlen < length) { - logger(LOG_ERR, _("Error while encrypting metadata to %s (%s): %s"), + logger(LOG_ERR, "Error while encrypting metadata to %s (%s): %s", c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL)); return false; } else if(outlen > length) { - logger(LOG_EMERG, _("Encrypted data too long! Heap corrupted!")); + logger(LOG_EMERG, "Encrypted data too long! Heap corrupted!"); abort(); } c->outbuflen += outlen; @@ -79,28 +80,27 @@ bool send_meta(connection_t *c, const char *buffer, int length) return true; } -bool flush_meta(connection_t *c) -{ +bool flush_meta(connection_t *c) { int result; - ifdebug(META) logger(LOG_DEBUG, _("Flushing %d bytes to %s (%s)"), + ifdebug(META) logger(LOG_DEBUG, "Flushing %d bytes to %s (%s)", c->outbuflen, c->name, c->hostname); while(c->outbuflen) { result = send(c->socket, c->outbuf + c->outbufstart, c->outbuflen, 0); if(result <= 0) { if(!errno || errno == EPIPE) { - ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"), + ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname); } else if(errno == EINTR) { continue; - } else if(errno == EWOULDBLOCK) { - ifdebug(CONNECTIONS) logger(LOG_DEBUG, _("Flushing %d bytes to %s (%s) would block"), + } else if(sockwouldblock(sockerrno)) { + ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Flushing %d bytes to %s (%s) would block", c->outbuflen, c->name, c->hostname); return true; } else { - logger(LOG_ERR, _("Flushing meta data to %s (%s) failed: %s"), c->name, - c->hostname, strerror(errno)); + logger(LOG_ERR, "Flushing meta data to %s (%s) failed: %s", c->name, + c->hostname, sockstrerror(sockerrno)); } return false; @@ -114,13 +114,10 @@ bool flush_meta(connection_t *c) return true; } -void broadcast_meta(connection_t *from, const char *buffer, int length) -{ +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; @@ -129,15 +126,12 @@ void broadcast_meta(connection_t *from, const char *buffer, int length) } } -bool receive_meta(connection_t *c) -{ +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. @@ -151,13 +145,13 @@ bool receive_meta(connection_t *c) if(lenin <= 0) { if(!lenin || !errno) { - ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection closed by %s (%s)"), + ifdebug(CONNECTIONS) logger(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(LOG_ERR, "Metadata socket read error for %s (%s): %s", + c->name, c->hostname, sockstrerror(sockerrno)); return false; } @@ -171,7 +165,7 @@ bool receive_meta(connection_t *c) if(c->status.decryptin && !decrypted) { result = EVP_DecryptUpdate(c->inctx, (unsigned char *)inbuf, &lenout, (unsigned char *)c->buffer + oldlen, lenin); if(!result || lenout != lenin) { - logger(LOG_ERR, _("Error while decrypting metadata from %s (%s): %s"), + logger(LOG_ERR, "Error while decrypting metadata from %s (%s): %s", c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL)); return false; } @@ -183,7 +177,45 @@ bool receive_meta(connection_t *c) if(c->tcplen) { if(c->tcplen <= c->buflen) { - receive_tcppacket(c, c->buffer, c->tcplen); + if(!c->node) { + if(proxytype == PROXY_SOCKS4 && c->allow_request == ID) { + if(c->buffer[0] == 0 && c->buffer[1] == 0x5a) { + logger(LOG_DEBUG, "Proxy request granted"); + } else { + logger(LOG_ERR, "Proxy request rejected"); + return false; + } + } else if(proxytype == PROXY_SOCKS5 && c->allow_request == ID) { + if(c->buffer[0] != 5) { + logger(LOG_ERR, "Invalid response from proxy server"); + return false; + } + if(c->buffer[1] == 0xff) { + logger(LOG_ERR, "Proxy request rejected: unsuitable authentication method"); + return false; + } + if(c->buffer[2] != 5) { + logger(LOG_ERR, "Invalid response from proxy server"); + return false; + } + if(c->buffer[3] == 0) { + logger(LOG_DEBUG, "Proxy request granted"); + } else { + logger(LOG_DEBUG, "Proxy request rejected"); + return false; + } + } else { + logger(LOG_ERR, "c->tcplen set but c->node is NULL!"); + abort(); + } + } else { + if(c->allow_request == ALL) { + receive_tcppacket(c, c->buffer, c->tcplen); + } else { + logger(LOG_ERR, "Got unauthorized TCP packet from %s (%s)", c->name, c->hostname); + return false; + } + } c->buflen -= c->tcplen; lenin -= c->tcplen - oldlen; @@ -224,12 +256,10 @@ bool receive_meta(connection_t *c) } if(c->buflen >= MAXBUFSIZE) { - logger(LOG_ERR, _("Metadata read buffer overflow for %s (%s)"), + logger(LOG_ERR, "Metadata read buffer overflow for %s (%s)", c->name, c->hostname); return false; } - c->last_ping_time = now; - return true; }