X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fmeta.c;h=260cb005051ff9cf6ab33473fe22d1e5a5308552;hp=e286aea96a577dc12bfc6ba61d9e34459d93dc5f;hb=d4410d0cce40929db9a0ce7042ef962f1867234d;hpb=1d9dacb1f26971e19463b5501c2410c57f780ecb diff --git a/src/meta.c b/src/meta.c index e286aea9..260cb005 100644 --- a/src/meta.c +++ b/src/meta.c @@ -1,6 +1,6 @@ /* meta.c -- handle the meta communication - Copyright (C) 2000-2009 Guus Sliepen , + Copyright (C) 2000-2014 Guus Sliepen , 2000-2005 Ivo Timmermans 2006 Scott Lamb @@ -21,7 +21,6 @@ #include "system.h" -#include "splay_tree.h" #include "cipher.h" #include "connection.h" #include "logger.h" @@ -31,7 +30,11 @@ #include "utils.h" #include "xalloc.h" -bool send_meta_sptps(void *handle, const char *buffer, size_t length) { +#ifndef MIN +#define MIN(x, y) (((x)<(y))?(x):(y)) +#endif + +bool send_meta_sptps(void *handle, uint8_t type, const void *buffer, size_t length) { connection_t *c = handle; if(!c) { @@ -39,10 +42,8 @@ bool send_meta_sptps(void *handle, const char *buffer, size_t length) { abort(); } - logger(DEBUG_ALWAYS, LOG_DEBUG, "send_meta_sptps(%s, %p, %zu)", c->name, buffer, length); - buffer_add(&c->outbuf, buffer, length); - event_add(&c->outevent, NULL); + io_set(&c->io, IO_READ | IO_WRITE); return true; } @@ -61,36 +62,48 @@ bool send_meta(connection_t *c, const char *buffer, int 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) { + 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); } - event_add(&c->outevent, NULL); + io_set(&c->io, IO_READ | IO_WRITE); return true; } -void broadcast_meta(connection_t *from, const char *buffer, int length) { - splay_node_t *node; - connection_t *c; +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); - for(node = connection_tree->head; node; node = node->next) { - c = node->data; + io_set(&c->io, IO_READ | IO_WRITE); +} - if(c != from && c->status.active) +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 char *data, uint16_t 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) { @@ -98,8 +111,6 @@ bool receive_meta_sptps(void *handle, uint8_t type, const char *data, uint16_t l abort(); } - logger(DEBUG_ALWAYS, LOG_DEBUG, "receive_meta_sptps(%s, %d, %p, %hu)", c->name, type, data, length); - if(type == SPTPS_HANDSHAKE) { if(c->allow_request == ACK) return send_ack(c); @@ -120,6 +131,11 @@ bool receive_meta_sptps(void *handle, uint8_t type, const char *data, uint16_t l 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); @@ -149,7 +165,7 @@ bool receive_meta(connection_t *c) { inlen = recv(c->socket, inbuf, sizeof inbuf - c->inbuf.len, 0); if(inlen <= 0) { - if(!inlen || !errno) { + if(!inlen || !sockerrno) { logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection closed by %s (%s)", c->name, c->hostname); } else if(sockwouldblock(sockerrno)) @@ -161,9 +177,32 @@ bool receive_meta(connection_t *c) { } 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) { - logger(DEBUG_ALWAYS, LOG_DEBUG, "Receiving %d bytes of SPTPS data", inlen); - return sptps_receive_data(&c->sptps, bufp, inlen); + int len = sptps_receive_data(&c->sptps, bufp, inlen); + if(!len) + return false; + bufp += len; + inlen -= len; + continue; } if(!c->status.decryptin) { @@ -178,16 +217,19 @@ bool receive_meta(connection_t *c) { inlen -= endp - bufp; bufp = endp; } else { +#ifdef DISABLE_LEGACY + return false; +#else size_t outlen = inlen; - logger(DEBUG_META, LOG_DEBUG, "Received encrypted %d bytes", inlen); - if(!cipher_decrypt(&c->incipher, bufp, inlen, buffer_prepare(&c->inbuf, inlen), &outlen, false) || inlen != outlen) { + 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) { @@ -195,13 +237,50 @@ bool receive_meta(connection_t *c) { if(c->tcplen) { char *tcpbuffer = buffer_read(&c->inbuf, c->tcplen); - if(tcpbuffer) { - receive_tcppacket(c, tcpbuffer, c->tcplen); - c->tcplen = 0; - continue; - } else { + 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 */