1462 lines
38 KiB
C
1462 lines
38 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at http://curl.haxx.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* $Id: telnet.c,v 1.106 2008-10-23 11:49:19 bagder Exp $
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***************************************************************************/
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#include "setup.h"
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#ifndef CURL_DISABLE_TELNET
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/* -- WIN32 approved -- */
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <ctype.h>
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#if defined(WIN32)
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#include <time.h>
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#include <io.h>
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#else
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <netinet/in.h>
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <netdb.h>
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#include <sys/ioctl.h>
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#endif /* WIN32 */
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#include "urldata.h"
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#include <curl/curl.h>
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#include "transfer.h"
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#include "sendf.h"
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#include "telnet.h"
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#include "connect.h"
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#define _MPRINTF_REPLACE /* use our functions only */
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#include <curl/mprintf.h>
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#define TELOPTS
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#define TELCMDS
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#include "arpa_telnet.h"
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#include "memory.h"
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#include "select.h"
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#include "strequal.h"
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#include "rawstr.h"
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/* The last #include file should be: */
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#include "memdebug.h"
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#define SUBBUFSIZE 512
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#define CURL_SB_CLEAR(x) x->subpointer = x->subbuffer;
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#define CURL_SB_TERM(x) { x->subend = x->subpointer; CURL_SB_CLEAR(x); }
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#define CURL_SB_ACCUM(x,c) \
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if(x->subpointer < (x->subbuffer+sizeof x->subbuffer)) { \
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*x->subpointer++ = (c); \
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}
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#define CURL_SB_GET(x) ((*x->subpointer++)&0xff)
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#define CURL_SB_PEEK(x) ((*x->subpointer)&0xff)
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#define CURL_SB_EOF(x) (x->subpointer >= x->subend)
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#define CURL_SB_LEN(x) (x->subend - x->subpointer)
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#ifdef CURL_DISABLE_VERBOSE_STRINGS
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#define printoption(a,b,c,d) do { } while(0)
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#endif
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#ifdef USE_WINSOCK
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typedef FARPROC WSOCK2_FUNC;
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static CURLcode check_wsock2 ( struct SessionHandle *data );
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#endif
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static
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void telrcv(struct connectdata *,
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const unsigned char *inbuf, /* Data received from socket */
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ssize_t count); /* Number of bytes received */
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#ifndef CURL_DISABLE_VERBOSE_STRINGS
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static void printoption(struct SessionHandle *data,
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const char *direction,
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int cmd, int option);
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#endif
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static void negotiate(struct connectdata *);
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static void send_negotiation(struct connectdata *, int cmd, int option);
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static void set_local_option(struct connectdata *, int cmd, int option);
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static void set_remote_option(struct connectdata *, int cmd, int option);
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static void printsub(struct SessionHandle *data,
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int direction, unsigned char *pointer,
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size_t length);
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static void suboption(struct connectdata *);
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static CURLcode telnet_do(struct connectdata *conn, bool *done);
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static CURLcode telnet_done(struct connectdata *conn,
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CURLcode, bool premature);
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/* For negotiation compliant to RFC 1143 */
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#define CURL_NO 0
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#define CURL_YES 1
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#define CURL_WANTYES 2
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#define CURL_WANTNO 3
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#define CURL_EMPTY 0
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#define CURL_OPPOSITE 1
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/*
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* Telnet receiver states for fsm
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*/
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typedef enum
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{
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CURL_TS_DATA = 0,
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CURL_TS_IAC,
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CURL_TS_WILL,
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CURL_TS_WONT,
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CURL_TS_DO,
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CURL_TS_DONT,
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CURL_TS_CR,
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CURL_TS_SB, /* sub-option collection */
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CURL_TS_SE /* looking for sub-option end */
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} TelnetReceive;
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struct TELNET {
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int please_negotiate;
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int already_negotiated;
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int us[256];
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int usq[256];
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int us_preferred[256];
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int him[256];
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int himq[256];
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int him_preferred[256];
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char subopt_ttype[32]; /* Set with suboption TTYPE */
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char subopt_xdisploc[128]; /* Set with suboption XDISPLOC */
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struct curl_slist *telnet_vars; /* Environment variables */
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/* suboptions */
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unsigned char subbuffer[SUBBUFSIZE];
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unsigned char *subpointer, *subend; /* buffer for sub-options */
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TelnetReceive telrcv_state;
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};
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/*
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* TELNET protocol handler.
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*/
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const struct Curl_handler Curl_handler_telnet = {
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"TELNET", /* scheme */
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ZERO_NULL, /* setup_connection */
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telnet_do, /* do_it */
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telnet_done, /* done */
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ZERO_NULL, /* do_more */
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ZERO_NULL, /* connect_it */
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ZERO_NULL, /* connecting */
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ZERO_NULL, /* doing */
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ZERO_NULL, /* proto_getsock */
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ZERO_NULL, /* doing_getsock */
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ZERO_NULL, /* disconnect */
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PORT_TELNET, /* defport */
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PROT_TELNET /* protocol */
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};
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#ifdef USE_WINSOCK
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static CURLcode
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check_wsock2 ( struct SessionHandle *data )
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{
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int err;
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WORD wVersionRequested;
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WSADATA wsaData;
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DEBUGASSERT(data);
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/* telnet requires at least WinSock 2.0 so ask for it. */
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wVersionRequested = MAKEWORD(2, 0);
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err = WSAStartup(wVersionRequested, &wsaData);
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/* We must've called this once already, so this call */
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/* should always succeed. But, just in case... */
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if(err != 0) {
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failf(data,"WSAStartup failed (%d)",err);
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return CURLE_FAILED_INIT;
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}
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/* We have to have a WSACleanup call for every successful */
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/* WSAStartup call. */
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WSACleanup();
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/* Check that our version is supported */
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if(LOBYTE(wsaData.wVersion) != LOBYTE(wVersionRequested) ||
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HIBYTE(wsaData.wVersion) != HIBYTE(wVersionRequested)) {
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/* Our version isn't supported */
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failf(data,"insufficient winsock version to support "
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"telnet");
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return CURLE_FAILED_INIT;
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}
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/* Our version is supported */
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return CURLE_OK;
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}
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#endif
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static
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CURLcode init_telnet(struct connectdata *conn)
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{
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struct TELNET *tn;
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tn = calloc(1, sizeof(struct TELNET));
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if(!tn)
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return CURLE_OUT_OF_MEMORY;
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conn->data->state.proto.telnet = (void *)tn; /* make us known */
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tn->telrcv_state = CURL_TS_DATA;
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/* Init suboptions */
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CURL_SB_CLEAR(tn);
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/* Set the options we want by default */
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tn->us_preferred[CURL_TELOPT_BINARY] = CURL_YES;
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tn->us_preferred[CURL_TELOPT_SGA] = CURL_YES;
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tn->him_preferred[CURL_TELOPT_BINARY] = CURL_YES;
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tn->him_preferred[CURL_TELOPT_SGA] = CURL_YES;
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return CURLE_OK;
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}
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static void negotiate(struct connectdata *conn)
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{
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int i;
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struct TELNET *tn = (struct TELNET *) conn->data->state.proto.telnet;
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for(i = 0;i < CURL_NTELOPTS;i++)
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{
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if(tn->us_preferred[i] == CURL_YES)
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set_local_option(conn, i, CURL_YES);
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if(tn->him_preferred[i] == CURL_YES)
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set_remote_option(conn, i, CURL_YES);
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}
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}
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#ifndef CURL_DISABLE_VERBOSE_STRINGS
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static void printoption(struct SessionHandle *data,
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const char *direction, int cmd, int option)
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{
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const char *fmt;
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const char *opt;
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if(data->set.verbose)
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{
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if(cmd == CURL_IAC)
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{
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if(CURL_TELCMD_OK(option))
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infof(data, "%s IAC %s\n", direction, CURL_TELCMD(option));
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else
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infof(data, "%s IAC %d\n", direction, option);
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}
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else
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{
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fmt = (cmd == CURL_WILL) ? "WILL" : (cmd == CURL_WONT) ? "WONT" :
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(cmd == CURL_DO) ? "DO" : (cmd == CURL_DONT) ? "DONT" : 0;
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if(fmt)
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{
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if(CURL_TELOPT_OK(option))
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opt = CURL_TELOPT(option);
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else if(option == CURL_TELOPT_EXOPL)
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opt = "EXOPL";
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else
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opt = NULL;
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if(opt)
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infof(data, "%s %s %s\n", direction, fmt, opt);
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else
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infof(data, "%s %s %d\n", direction, fmt, option);
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}
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else
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infof(data, "%s %d %d\n", direction, cmd, option);
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}
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}
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}
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#endif
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static void send_negotiation(struct connectdata *conn, int cmd, int option)
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{
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unsigned char buf[3];
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ssize_t bytes_written;
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int err;
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struct SessionHandle *data = conn->data;
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buf[0] = CURL_IAC;
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buf[1] = (unsigned char)cmd;
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buf[2] = (unsigned char)option;
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bytes_written = swrite(conn->sock[FIRSTSOCKET], buf, 3);
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if(bytes_written < 0) {
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err = SOCKERRNO;
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failf(data,"Sending data failed (%d)",err);
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}
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printoption(conn->data, "SENT", cmd, option);
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}
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static
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void set_remote_option(struct connectdata *conn, int option, int newstate)
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{
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struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
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if(newstate == CURL_YES)
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{
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switch(tn->him[option])
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{
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case CURL_NO:
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tn->him[option] = CURL_WANTYES;
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send_negotiation(conn, CURL_DO, option);
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break;
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case CURL_YES:
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/* Already enabled */
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break;
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case CURL_WANTNO:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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/* Already negotiating for CURL_YES, queue the request */
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tn->himq[option] = CURL_OPPOSITE;
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break;
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case CURL_OPPOSITE:
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/* Error: already queued an enable request */
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break;
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}
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break;
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case CURL_WANTYES:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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/* Error: already negotiating for enable */
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break;
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case CURL_OPPOSITE:
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tn->himq[option] = CURL_EMPTY;
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break;
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}
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break;
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}
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}
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else /* NO */
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{
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switch(tn->him[option])
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{
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case CURL_NO:
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/* Already disabled */
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break;
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case CURL_YES:
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tn->him[option] = CURL_WANTNO;
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send_negotiation(conn, CURL_DONT, option);
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break;
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case CURL_WANTNO:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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/* Already negotiating for NO */
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break;
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case CURL_OPPOSITE:
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tn->himq[option] = CURL_EMPTY;
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break;
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}
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break;
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case CURL_WANTYES:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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tn->himq[option] = CURL_OPPOSITE;
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break;
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case CURL_OPPOSITE:
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break;
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}
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break;
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}
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}
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}
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static
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void rec_will(struct connectdata *conn, int option)
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{
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struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
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switch(tn->him[option])
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{
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case CURL_NO:
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if(tn->him_preferred[option] == CURL_YES)
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{
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tn->him[option] = CURL_YES;
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send_negotiation(conn, CURL_DO, option);
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}
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else
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{
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send_negotiation(conn, CURL_DONT, option);
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}
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break;
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case CURL_YES:
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/* Already enabled */
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break;
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case CURL_WANTNO:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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/* Error: DONT answered by WILL */
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tn->him[option] = CURL_NO;
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break;
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case CURL_OPPOSITE:
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/* Error: DONT answered by WILL */
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tn->him[option] = CURL_YES;
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tn->himq[option] = CURL_EMPTY;
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break;
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}
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break;
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case CURL_WANTYES:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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tn->him[option] = CURL_YES;
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break;
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case CURL_OPPOSITE:
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tn->him[option] = CURL_WANTNO;
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tn->himq[option] = CURL_EMPTY;
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send_negotiation(conn, CURL_DONT, option);
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break;
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}
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break;
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}
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}
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static
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void rec_wont(struct connectdata *conn, int option)
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{
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struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
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switch(tn->him[option])
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{
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case CURL_NO:
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/* Already disabled */
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break;
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case CURL_YES:
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tn->him[option] = CURL_NO;
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send_negotiation(conn, CURL_DONT, option);
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break;
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case CURL_WANTNO:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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tn->him[option] = CURL_NO;
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break;
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case CURL_OPPOSITE:
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tn->him[option] = CURL_WANTYES;
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tn->himq[option] = CURL_EMPTY;
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send_negotiation(conn, CURL_DO, option);
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break;
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}
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break;
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case CURL_WANTYES:
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switch(tn->himq[option])
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{
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case CURL_EMPTY:
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tn->him[option] = CURL_NO;
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break;
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case CURL_OPPOSITE:
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tn->him[option] = CURL_NO;
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tn->himq[option] = CURL_EMPTY;
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break;
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}
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break;
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}
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}
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static void
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set_local_option(struct connectdata *conn, int option, int newstate)
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{
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struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
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if(newstate == CURL_YES)
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{
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switch(tn->us[option])
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{
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case CURL_NO:
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tn->us[option] = CURL_WANTYES;
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send_negotiation(conn, CURL_WILL, option);
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break;
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case CURL_YES:
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/* Already enabled */
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break;
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case CURL_WANTNO:
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switch(tn->usq[option])
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{
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case CURL_EMPTY:
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/* Already negotiating for CURL_YES, queue the request */
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tn->usq[option] = CURL_OPPOSITE;
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break;
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case CURL_OPPOSITE:
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/* Error: already queued an enable request */
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break;
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}
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break;
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case CURL_WANTYES:
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switch(tn->usq[option])
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{
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case CURL_EMPTY:
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/* Error: already negotiating for enable */
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break;
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case CURL_OPPOSITE:
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tn->usq[option] = CURL_EMPTY;
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break;
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}
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break;
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}
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}
|
|
else /* NO */
|
|
{
|
|
switch(tn->us[option])
|
|
{
|
|
case CURL_NO:
|
|
/* Already disabled */
|
|
break;
|
|
|
|
case CURL_YES:
|
|
tn->us[option] = CURL_WANTNO;
|
|
send_negotiation(conn, CURL_WONT, option);
|
|
break;
|
|
|
|
case CURL_WANTNO:
|
|
switch(tn->usq[option])
|
|
{
|
|
case CURL_EMPTY:
|
|
/* Already negotiating for NO */
|
|
break;
|
|
case CURL_OPPOSITE:
|
|
tn->usq[option] = CURL_EMPTY;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CURL_WANTYES:
|
|
switch(tn->usq[option])
|
|
{
|
|
case CURL_EMPTY:
|
|
tn->usq[option] = CURL_OPPOSITE;
|
|
break;
|
|
case CURL_OPPOSITE:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static
|
|
void rec_do(struct connectdata *conn, int option)
|
|
{
|
|
struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
|
|
switch(tn->us[option])
|
|
{
|
|
case CURL_NO:
|
|
if(tn->us_preferred[option] == CURL_YES)
|
|
{
|
|
tn->us[option] = CURL_YES;
|
|
send_negotiation(conn, CURL_WILL, option);
|
|
}
|
|
else
|
|
{
|
|
send_negotiation(conn, CURL_WONT, option);
|
|
}
|
|
break;
|
|
|
|
case CURL_YES:
|
|
/* Already enabled */
|
|
break;
|
|
|
|
case CURL_WANTNO:
|
|
switch(tn->usq[option])
|
|
{
|
|
case CURL_EMPTY:
|
|
/* Error: DONT answered by WILL */
|
|
tn->us[option] = CURL_NO;
|
|
break;
|
|
case CURL_OPPOSITE:
|
|
/* Error: DONT answered by WILL */
|
|
tn->us[option] = CURL_YES;
|
|
tn->usq[option] = CURL_EMPTY;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CURL_WANTYES:
|
|
switch(tn->usq[option])
|
|
{
|
|
case CURL_EMPTY:
|
|
tn->us[option] = CURL_YES;
|
|
break;
|
|
case CURL_OPPOSITE:
|
|
tn->us[option] = CURL_WANTNO;
|
|
tn->himq[option] = CURL_EMPTY;
|
|
send_negotiation(conn, CURL_WONT, option);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
static
|
|
void rec_dont(struct connectdata *conn, int option)
|
|
{
|
|
struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
|
|
switch(tn->us[option])
|
|
{
|
|
case CURL_NO:
|
|
/* Already disabled */
|
|
break;
|
|
|
|
case CURL_YES:
|
|
tn->us[option] = CURL_NO;
|
|
send_negotiation(conn, CURL_WONT, option);
|
|
break;
|
|
|
|
case CURL_WANTNO:
|
|
switch(tn->usq[option])
|
|
{
|
|
case CURL_EMPTY:
|
|
tn->us[option] = CURL_NO;
|
|
break;
|
|
|
|
case CURL_OPPOSITE:
|
|
tn->us[option] = CURL_WANTYES;
|
|
tn->usq[option] = CURL_EMPTY;
|
|
send_negotiation(conn, CURL_WILL, option);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CURL_WANTYES:
|
|
switch(tn->usq[option])
|
|
{
|
|
case CURL_EMPTY:
|
|
tn->us[option] = CURL_NO;
|
|
break;
|
|
case CURL_OPPOSITE:
|
|
tn->us[option] = CURL_NO;
|
|
tn->usq[option] = CURL_EMPTY;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
static void printsub(struct SessionHandle *data,
|
|
int direction, /* '<' or '>' */
|
|
unsigned char *pointer, /* where suboption data is */
|
|
size_t length) /* length of suboption data */
|
|
{
|
|
unsigned int i = 0;
|
|
|
|
if(data->set.verbose)
|
|
{
|
|
if(direction)
|
|
{
|
|
infof(data, "%s IAC SB ", (direction == '<')? "RCVD":"SENT");
|
|
if(length >= 3)
|
|
{
|
|
int j;
|
|
|
|
i = pointer[length-2];
|
|
j = pointer[length-1];
|
|
|
|
if(i != CURL_IAC || j != CURL_SE)
|
|
{
|
|
infof(data, "(terminated by ");
|
|
if(CURL_TELOPT_OK(i))
|
|
infof(data, "%s ", CURL_TELOPT(i));
|
|
else if(CURL_TELCMD_OK(i))
|
|
infof(data, "%s ", CURL_TELCMD(i));
|
|
else
|
|
infof(data, "%d ", i);
|
|
if(CURL_TELOPT_OK(j))
|
|
infof(data, "%s", CURL_TELOPT(j));
|
|
else if(CURL_TELCMD_OK(j))
|
|
infof(data, "%s", CURL_TELCMD(j));
|
|
else
|
|
infof(data, "%d", j);
|
|
infof(data, ", not IAC SE!) ");
|
|
}
|
|
}
|
|
length -= 2;
|
|
}
|
|
if(length < 1)
|
|
{
|
|
infof(data, "(Empty suboption?)");
|
|
return;
|
|
}
|
|
|
|
if(CURL_TELOPT_OK(pointer[0])) {
|
|
switch(pointer[0]) {
|
|
case CURL_TELOPT_TTYPE:
|
|
case CURL_TELOPT_XDISPLOC:
|
|
case CURL_TELOPT_NEW_ENVIRON:
|
|
infof(data, "%s", CURL_TELOPT(pointer[0]));
|
|
break;
|
|
default:
|
|
infof(data, "%s (unsupported)", CURL_TELOPT(pointer[0]));
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
infof(data, "%d (unknown)", pointer[i]);
|
|
|
|
switch(pointer[1]) {
|
|
case CURL_TELQUAL_IS:
|
|
infof(data, " IS");
|
|
break;
|
|
case CURL_TELQUAL_SEND:
|
|
infof(data, " SEND");
|
|
break;
|
|
case CURL_TELQUAL_INFO:
|
|
infof(data, " INFO/REPLY");
|
|
break;
|
|
case CURL_TELQUAL_NAME:
|
|
infof(data, " NAME");
|
|
break;
|
|
}
|
|
|
|
switch(pointer[0]) {
|
|
case CURL_TELOPT_TTYPE:
|
|
case CURL_TELOPT_XDISPLOC:
|
|
pointer[length] = 0;
|
|
infof(data, " \"%s\"", &pointer[2]);
|
|
break;
|
|
case CURL_TELOPT_NEW_ENVIRON:
|
|
if(pointer[1] == CURL_TELQUAL_IS) {
|
|
infof(data, " ");
|
|
for(i = 3;i < length;i++) {
|
|
switch(pointer[i]) {
|
|
case CURL_NEW_ENV_VAR:
|
|
infof(data, ", ");
|
|
break;
|
|
case CURL_NEW_ENV_VALUE:
|
|
infof(data, " = ");
|
|
break;
|
|
default:
|
|
infof(data, "%c", pointer[i]);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
default:
|
|
for (i = 2; i < length; i++)
|
|
infof(data, " %.2x", pointer[i]);
|
|
break;
|
|
}
|
|
|
|
if(direction)
|
|
{
|
|
infof(data, "\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
static CURLcode check_telnet_options(struct connectdata *conn)
|
|
{
|
|
struct curl_slist *head;
|
|
char option_keyword[128];
|
|
char option_arg[256];
|
|
char *buf;
|
|
struct SessionHandle *data = conn->data;
|
|
struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
|
|
|
|
/* Add the user name as an environment variable if it
|
|
was given on the command line */
|
|
if(conn->bits.user_passwd)
|
|
{
|
|
snprintf(option_arg, sizeof(option_arg), "USER,%s", conn->user);
|
|
tn->telnet_vars = curl_slist_append(tn->telnet_vars, option_arg);
|
|
|
|
tn->us_preferred[CURL_TELOPT_NEW_ENVIRON] = CURL_YES;
|
|
}
|
|
|
|
for(head = data->set.telnet_options; head; head=head->next) {
|
|
if(sscanf(head->data, "%127[^= ]%*[ =]%255s",
|
|
option_keyword, option_arg) == 2) {
|
|
|
|
/* Terminal type */
|
|
if(Curl_raw_equal(option_keyword, "TTYPE")) {
|
|
strncpy(tn->subopt_ttype, option_arg, 31);
|
|
tn->subopt_ttype[31] = 0; /* String termination */
|
|
tn->us_preferred[CURL_TELOPT_TTYPE] = CURL_YES;
|
|
continue;
|
|
}
|
|
|
|
/* Display variable */
|
|
if(Curl_raw_equal(option_keyword, "XDISPLOC")) {
|
|
strncpy(tn->subopt_xdisploc, option_arg, 127);
|
|
tn->subopt_xdisploc[127] = 0; /* String termination */
|
|
tn->us_preferred[CURL_TELOPT_XDISPLOC] = CURL_YES;
|
|
continue;
|
|
}
|
|
|
|
/* Environment variable */
|
|
if(Curl_raw_equal(option_keyword, "NEW_ENV")) {
|
|
buf = strdup(option_arg);
|
|
if(!buf)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
tn->telnet_vars = curl_slist_append(tn->telnet_vars, buf);
|
|
tn->us_preferred[CURL_TELOPT_NEW_ENVIRON] = CURL_YES;
|
|
continue;
|
|
}
|
|
|
|
failf(data, "Unknown telnet option %s", head->data);
|
|
return CURLE_UNKNOWN_TELNET_OPTION;
|
|
} else {
|
|
failf(data, "Syntax error in telnet option: %s", head->data);
|
|
return CURLE_TELNET_OPTION_SYNTAX;
|
|
}
|
|
}
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/*
|
|
* suboption()
|
|
*
|
|
* Look at the sub-option buffer, and try to be helpful to the other
|
|
* side.
|
|
*/
|
|
|
|
static void suboption(struct connectdata *conn)
|
|
{
|
|
struct curl_slist *v;
|
|
unsigned char temp[2048];
|
|
ssize_t bytes_written;
|
|
size_t len;
|
|
size_t tmplen;
|
|
int err;
|
|
char varname[128];
|
|
char varval[128];
|
|
struct SessionHandle *data = conn->data;
|
|
struct TELNET *tn = (struct TELNET *)data->state.proto.telnet;
|
|
|
|
printsub(data, '<', (unsigned char *)tn->subbuffer, CURL_SB_LEN(tn)+2);
|
|
switch (CURL_SB_GET(tn)) {
|
|
case CURL_TELOPT_TTYPE:
|
|
len = strlen(tn->subopt_ttype) + 4 + 2;
|
|
snprintf((char *)temp, sizeof(temp),
|
|
"%c%c%c%c%s%c%c", CURL_IAC, CURL_SB, CURL_TELOPT_TTYPE,
|
|
CURL_TELQUAL_IS, tn->subopt_ttype, CURL_IAC, CURL_SE);
|
|
bytes_written = swrite(conn->sock[FIRSTSOCKET], temp, len);
|
|
if(bytes_written < 0) {
|
|
err = SOCKERRNO;
|
|
failf(data,"Sending data failed (%d)",err);
|
|
}
|
|
printsub(data, '>', &temp[2], len-2);
|
|
break;
|
|
case CURL_TELOPT_XDISPLOC:
|
|
len = strlen(tn->subopt_xdisploc) + 4 + 2;
|
|
snprintf((char *)temp, sizeof(temp),
|
|
"%c%c%c%c%s%c%c", CURL_IAC, CURL_SB, CURL_TELOPT_XDISPLOC,
|
|
CURL_TELQUAL_IS, tn->subopt_xdisploc, CURL_IAC, CURL_SE);
|
|
bytes_written = swrite(conn->sock[FIRSTSOCKET], temp, len);
|
|
if(bytes_written < 0) {
|
|
err = SOCKERRNO;
|
|
failf(data,"Sending data failed (%d)",err);
|
|
}
|
|
printsub(data, '>', &temp[2], len-2);
|
|
break;
|
|
case CURL_TELOPT_NEW_ENVIRON:
|
|
snprintf((char *)temp, sizeof(temp),
|
|
"%c%c%c%c", CURL_IAC, CURL_SB, CURL_TELOPT_NEW_ENVIRON,
|
|
CURL_TELQUAL_IS);
|
|
len = 4;
|
|
|
|
for(v = tn->telnet_vars;v;v = v->next) {
|
|
tmplen = (strlen(v->data) + 1);
|
|
/* Add the variable only if it fits */
|
|
if(len + tmplen < (int)sizeof(temp)-6) {
|
|
sscanf(v->data, "%127[^,],%127s", varname, varval);
|
|
snprintf((char *)&temp[len], sizeof(temp) - len,
|
|
"%c%s%c%s", CURL_NEW_ENV_VAR, varname,
|
|
CURL_NEW_ENV_VALUE, varval);
|
|
len += tmplen;
|
|
}
|
|
}
|
|
snprintf((char *)&temp[len], sizeof(temp) - len,
|
|
"%c%c", CURL_IAC, CURL_SE);
|
|
len += 2;
|
|
bytes_written = swrite(conn->sock[FIRSTSOCKET], temp, len);
|
|
if(bytes_written < 0) {
|
|
err = SOCKERRNO;
|
|
failf(data,"Sending data failed (%d)",err);
|
|
}
|
|
printsub(data, '>', &temp[2], len-2);
|
|
break;
|
|
}
|
|
return;
|
|
}
|
|
|
|
static
|
|
void telrcv(struct connectdata *conn,
|
|
const unsigned char *inbuf, /* Data received from socket */
|
|
ssize_t count) /* Number of bytes received */
|
|
{
|
|
unsigned char c;
|
|
int in = 0;
|
|
int startwrite=-1;
|
|
struct SessionHandle *data = conn->data;
|
|
struct TELNET *tn = (struct TELNET *)data->state.proto.telnet;
|
|
|
|
#define startskipping() \
|
|
if(startwrite >= 0) \
|
|
Curl_client_write(conn, CLIENTWRITE_BODY, (char *)&inbuf[startwrite], in-startwrite); \
|
|
startwrite = -1
|
|
|
|
#define writebyte() \
|
|
if(startwrite < 0) \
|
|
startwrite = in
|
|
|
|
#define bufferflush() startskipping()
|
|
|
|
while(count--)
|
|
{
|
|
c = inbuf[in];
|
|
|
|
/*infof(data,"In rcv state %d char %d\n", tn->telrcv_state, c);*/
|
|
switch (tn->telrcv_state)
|
|
{
|
|
case CURL_TS_CR:
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
if(c == '\0')
|
|
{
|
|
startskipping();
|
|
break; /* Ignore \0 after CR */
|
|
}
|
|
writebyte();
|
|
break;
|
|
|
|
case CURL_TS_DATA:
|
|
if(c == CURL_IAC)
|
|
{
|
|
tn->telrcv_state = CURL_TS_IAC;
|
|
startskipping();
|
|
break;
|
|
}
|
|
else if(c == '\r')
|
|
{
|
|
tn->telrcv_state = CURL_TS_CR;
|
|
}
|
|
writebyte();
|
|
break;
|
|
|
|
case CURL_TS_IAC:
|
|
process_iac:
|
|
DEBUGASSERT(startwrite < 0);
|
|
switch (c)
|
|
{
|
|
case CURL_WILL:
|
|
tn->telrcv_state = CURL_TS_WILL;
|
|
break;
|
|
case CURL_WONT:
|
|
tn->telrcv_state = CURL_TS_WONT;
|
|
break;
|
|
case CURL_DO:
|
|
tn->telrcv_state = CURL_TS_DO;
|
|
break;
|
|
case CURL_DONT:
|
|
tn->telrcv_state = CURL_TS_DONT;
|
|
break;
|
|
case CURL_SB:
|
|
CURL_SB_CLEAR(tn);
|
|
tn->telrcv_state = CURL_TS_SB;
|
|
break;
|
|
case CURL_IAC:
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
writebyte();
|
|
break;
|
|
case CURL_DM:
|
|
case CURL_NOP:
|
|
case CURL_GA:
|
|
default:
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
printoption(data, "RCVD", CURL_IAC, c);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case CURL_TS_WILL:
|
|
printoption(data, "RCVD", CURL_WILL, c);
|
|
tn->please_negotiate = 1;
|
|
rec_will(conn, c);
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
break;
|
|
|
|
case CURL_TS_WONT:
|
|
printoption(data, "RCVD", CURL_WONT, c);
|
|
tn->please_negotiate = 1;
|
|
rec_wont(conn, c);
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
break;
|
|
|
|
case CURL_TS_DO:
|
|
printoption(data, "RCVD", CURL_DO, c);
|
|
tn->please_negotiate = 1;
|
|
rec_do(conn, c);
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
break;
|
|
|
|
case CURL_TS_DONT:
|
|
printoption(data, "RCVD", CURL_DONT, c);
|
|
tn->please_negotiate = 1;
|
|
rec_dont(conn, c);
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
break;
|
|
|
|
case CURL_TS_SB:
|
|
if(c == CURL_IAC)
|
|
{
|
|
tn->telrcv_state = CURL_TS_SE;
|
|
}
|
|
else
|
|
{
|
|
CURL_SB_ACCUM(tn,c);
|
|
}
|
|
break;
|
|
|
|
case CURL_TS_SE:
|
|
if(c != CURL_SE)
|
|
{
|
|
if(c != CURL_IAC)
|
|
{
|
|
/*
|
|
* This is an error. We only expect to get "IAC IAC" or "IAC SE".
|
|
* Several things may have happend. An IAC was not doubled, the
|
|
* IAC SE was left off, or another option got inserted into the
|
|
* suboption are all possibilities. If we assume that the IAC was
|
|
* not doubled, and really the IAC SE was left off, we could get
|
|
* into an infinate loop here. So, instead, we terminate the
|
|
* suboption, and process the partial suboption if we can.
|
|
*/
|
|
CURL_SB_ACCUM(tn, CURL_IAC);
|
|
CURL_SB_ACCUM(tn, c);
|
|
tn->subpointer -= 2;
|
|
CURL_SB_TERM(tn);
|
|
|
|
printoption(data, "In SUBOPTION processing, RCVD", CURL_IAC, c);
|
|
suboption(conn); /* handle sub-option */
|
|
tn->telrcv_state = CURL_TS_IAC;
|
|
goto process_iac;
|
|
}
|
|
CURL_SB_ACCUM(tn,c);
|
|
tn->telrcv_state = CURL_TS_SB;
|
|
}
|
|
else
|
|
{
|
|
CURL_SB_ACCUM(tn, CURL_IAC);
|
|
CURL_SB_ACCUM(tn, CURL_SE);
|
|
tn->subpointer -= 2;
|
|
CURL_SB_TERM(tn);
|
|
suboption(conn); /* handle sub-option */
|
|
tn->telrcv_state = CURL_TS_DATA;
|
|
}
|
|
break;
|
|
}
|
|
++in;
|
|
}
|
|
bufferflush();
|
|
}
|
|
|
|
/* Escape and send a telnet data block */
|
|
/* TODO: write large chunks of data instead of one byte at a time */
|
|
static CURLcode send_telnet_data(struct connectdata *conn,
|
|
char *buffer, ssize_t nread)
|
|
{
|
|
unsigned char outbuf[2];
|
|
ssize_t bytes_written, total_written;
|
|
int out_count;
|
|
CURLcode rc = CURLE_OK;
|
|
|
|
while(rc == CURLE_OK && nread--) {
|
|
outbuf[0] = *buffer++;
|
|
out_count = 1;
|
|
if(outbuf[0] == CURL_IAC)
|
|
outbuf[out_count++] = CURL_IAC;
|
|
|
|
total_written = 0;
|
|
do {
|
|
/* Make sure socket is writable to avoid EWOULDBLOCK condition */
|
|
struct pollfd pfd[1];
|
|
pfd[0].fd = conn->sock[FIRSTSOCKET];
|
|
pfd[0].events = POLLOUT;
|
|
switch (Curl_poll(pfd, 1, -1)) {
|
|
case -1: /* error, abort writing */
|
|
case 0: /* timeout (will never happen) */
|
|
rc = CURLE_SEND_ERROR;
|
|
break;
|
|
default: /* write! */
|
|
bytes_written = 0;
|
|
rc = Curl_write(conn, conn->sock[FIRSTSOCKET], outbuf+total_written,
|
|
out_count-total_written, &bytes_written);
|
|
total_written += bytes_written;
|
|
break;
|
|
}
|
|
/* handle partial write */
|
|
} while (rc == CURLE_OK && total_written < out_count);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static CURLcode telnet_done(struct connectdata *conn,
|
|
CURLcode status, bool premature)
|
|
{
|
|
struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet;
|
|
(void)status; /* unused */
|
|
(void)premature; /* not used */
|
|
|
|
curl_slist_free_all(tn->telnet_vars);
|
|
|
|
free(conn->data->state.proto.telnet);
|
|
conn->data->state.proto.telnet = NULL;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
static CURLcode telnet_do(struct connectdata *conn, bool *done)
|
|
{
|
|
CURLcode code;
|
|
struct SessionHandle *data = conn->data;
|
|
curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
|
|
#ifdef USE_WINSOCK
|
|
HMODULE wsock2;
|
|
WSOCK2_FUNC close_event_func;
|
|
WSOCK2_FUNC create_event_func;
|
|
WSOCK2_FUNC event_select_func;
|
|
WSOCK2_FUNC enum_netevents_func;
|
|
WSAEVENT event_handle;
|
|
WSANETWORKEVENTS events;
|
|
HANDLE stdin_handle;
|
|
HANDLE objs[2];
|
|
DWORD obj_count;
|
|
DWORD wait_timeout;
|
|
DWORD waitret;
|
|
DWORD readfile_read;
|
|
#else
|
|
int interval_ms;
|
|
struct pollfd pfd[2];
|
|
#endif
|
|
ssize_t nread;
|
|
bool keepon = TRUE;
|
|
char *buf = data->state.buffer;
|
|
struct TELNET *tn;
|
|
|
|
*done = TRUE; /* unconditionally */
|
|
|
|
code = init_telnet(conn);
|
|
if(code)
|
|
return code;
|
|
|
|
tn = (struct TELNET *)data->state.proto.telnet;
|
|
|
|
code = check_telnet_options(conn);
|
|
if(code)
|
|
return code;
|
|
|
|
#ifdef USE_WINSOCK
|
|
/*
|
|
** This functionality only works with WinSock >= 2.0. So,
|
|
** make sure have it.
|
|
*/
|
|
code = check_wsock2(data);
|
|
if(code)
|
|
return code;
|
|
|
|
/* OK, so we have WinSock 2.0. We need to dynamically */
|
|
/* load ws2_32.dll and get the function pointers we need. */
|
|
wsock2 = LoadLibrary("WS2_32.DLL");
|
|
if(wsock2 == NULL) {
|
|
failf(data,"failed to load WS2_32.DLL (%d)", ERRNO);
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
/* Grab a pointer to WSACreateEvent */
|
|
create_event_func = GetProcAddress(wsock2,"WSACreateEvent");
|
|
if(create_event_func == NULL) {
|
|
failf(data,"failed to find WSACreateEvent function (%d)",
|
|
ERRNO);
|
|
FreeLibrary(wsock2);
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
/* And WSACloseEvent */
|
|
close_event_func = GetProcAddress(wsock2,"WSACloseEvent");
|
|
if(close_event_func == NULL) {
|
|
failf(data,"failed to find WSACloseEvent function (%d)",
|
|
ERRNO);
|
|
FreeLibrary(wsock2);
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
/* And WSAEventSelect */
|
|
event_select_func = GetProcAddress(wsock2,"WSAEventSelect");
|
|
if(event_select_func == NULL) {
|
|
failf(data,"failed to find WSAEventSelect function (%d)",
|
|
ERRNO);
|
|
FreeLibrary(wsock2);
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
/* And WSAEnumNetworkEvents */
|
|
enum_netevents_func = GetProcAddress(wsock2,"WSAEnumNetworkEvents");
|
|
if(enum_netevents_func == NULL) {
|
|
failf(data,"failed to find WSAEnumNetworkEvents function (%d)",
|
|
ERRNO);
|
|
FreeLibrary(wsock2);
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
/* We want to wait for both stdin and the socket. Since
|
|
** the select() function in winsock only works on sockets
|
|
** we have to use the WaitForMultipleObjects() call.
|
|
*/
|
|
|
|
/* First, create a sockets event object */
|
|
event_handle = (WSAEVENT)create_event_func();
|
|
if(event_handle == WSA_INVALID_EVENT) {
|
|
failf(data,"WSACreateEvent failed (%d)", SOCKERRNO);
|
|
FreeLibrary(wsock2);
|
|
return CURLE_FAILED_INIT;
|
|
}
|
|
|
|
/* The get the Windows file handle for stdin */
|
|
stdin_handle = GetStdHandle(STD_INPUT_HANDLE);
|
|
|
|
/* Create the list of objects to wait for */
|
|
objs[0] = event_handle;
|
|
objs[1] = stdin_handle;
|
|
|
|
/* Tell winsock what events we want to listen to */
|
|
if(event_select_func(sockfd, event_handle, FD_READ|FD_CLOSE) == SOCKET_ERROR) {
|
|
close_event_func(event_handle);
|
|
FreeLibrary(wsock2);
|
|
return CURLE_OK;
|
|
}
|
|
|
|
/* If stdin_handle is a pipe, use PeekNamedPipe() method to check it,
|
|
else use the old WaitForMultipleObjects() way */
|
|
if(GetFileType(stdin_handle) == FILE_TYPE_PIPE) {
|
|
/* Don't wait for stdin_handle, just wait for event_handle */
|
|
obj_count = 1;
|
|
/* Check stdin_handle per 100 milliseconds */
|
|
wait_timeout = 100;
|
|
} else {
|
|
obj_count = 2;
|
|
wait_timeout = INFINITE;
|
|
}
|
|
|
|
/* Keep on listening and act on events */
|
|
while(keepon) {
|
|
waitret = WaitForMultipleObjects(obj_count, objs, FALSE, wait_timeout);
|
|
switch(waitret) {
|
|
case WAIT_TIMEOUT:
|
|
{
|
|
while(1) {
|
|
if(!PeekNamedPipe(stdin_handle, NULL, 0, NULL, &readfile_read, NULL)) {
|
|
keepon = FALSE;
|
|
code = CURLE_READ_ERROR;
|
|
break;
|
|
}
|
|
|
|
if(!readfile_read)
|
|
break;
|
|
|
|
if(!ReadFile(stdin_handle, buf, sizeof(data->state.buffer),
|
|
&readfile_read, NULL)) {
|
|
keepon = FALSE;
|
|
code = CURLE_READ_ERROR;
|
|
break;
|
|
}
|
|
|
|
code = send_telnet_data(conn, buf, readfile_read);
|
|
if(code) {
|
|
keepon = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
|
|
case WAIT_OBJECT_0 + 1:
|
|
{
|
|
if(!ReadFile(stdin_handle, buf, sizeof(data->state.buffer),
|
|
&readfile_read, NULL)) {
|
|
keepon = FALSE;
|
|
code = CURLE_READ_ERROR;
|
|
break;
|
|
}
|
|
|
|
code = send_telnet_data(conn, buf, readfile_read);
|
|
if(code) {
|
|
keepon = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case WAIT_OBJECT_0:
|
|
if(enum_netevents_func(sockfd, event_handle, &events)
|
|
!= SOCKET_ERROR) {
|
|
if(events.lNetworkEvents & FD_READ) {
|
|
/* This reallu OUGHT to check its return code. */
|
|
(void)Curl_read(conn, sockfd, buf, BUFSIZE - 1, &nread);
|
|
|
|
telrcv(conn, (unsigned char *)buf, nread);
|
|
|
|
fflush(stdout);
|
|
|
|
/* Negotiate if the peer has started negotiating,
|
|
otherwise don't. We don't want to speak telnet with
|
|
non-telnet servers, like POP or SMTP. */
|
|
if(tn->please_negotiate && !tn->already_negotiated) {
|
|
negotiate(conn);
|
|
tn->already_negotiated = 1;
|
|
}
|
|
}
|
|
|
|
if(events.lNetworkEvents & FD_CLOSE) {
|
|
keepon = FALSE;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* We called WSACreateEvent, so call WSACloseEvent */
|
|
if(close_event_func(event_handle) == FALSE) {
|
|
infof(data,"WSACloseEvent failed (%d)", SOCKERRNO);
|
|
}
|
|
|
|
/* "Forget" pointers into the library we're about to free */
|
|
create_event_func = NULL;
|
|
close_event_func = NULL;
|
|
event_select_func = NULL;
|
|
enum_netevents_func = NULL;
|
|
|
|
/* We called LoadLibrary, so call FreeLibrary */
|
|
if(!FreeLibrary(wsock2))
|
|
infof(data,"FreeLibrary(wsock2) failed (%d)", ERRNO);
|
|
#else
|
|
pfd[0].fd = sockfd;
|
|
pfd[0].events = POLLIN;
|
|
pfd[1].fd = 0;
|
|
pfd[1].events = POLLIN;
|
|
interval_ms = 1 * 1000;
|
|
|
|
while(keepon) {
|
|
switch (Curl_poll(pfd, 2, interval_ms)) {
|
|
case -1: /* error, stop reading */
|
|
keepon = FALSE;
|
|
continue;
|
|
case 0: /* timeout */
|
|
break;
|
|
default: /* read! */
|
|
if(pfd[1].revents & POLLIN) { /* read from stdin */
|
|
nread = read(0, buf, 255);
|
|
code = send_telnet_data(conn, buf, nread);
|
|
if(code) {
|
|
keepon = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(pfd[0].revents & POLLIN) {
|
|
/* This OUGHT to check the return code... */
|
|
(void)Curl_read(conn, sockfd, buf, BUFSIZE - 1, &nread);
|
|
|
|
/* if we receive 0 or less here, the server closed the connection and
|
|
we bail out from this! */
|
|
if(nread <= 0) {
|
|
keepon = FALSE;
|
|
break;
|
|
}
|
|
|
|
telrcv(conn, (unsigned char *)buf, nread);
|
|
|
|
/* Negotiate if the peer has started negotiating,
|
|
otherwise don't. We don't want to speak telnet with
|
|
non-telnet servers, like POP or SMTP. */
|
|
if(tn->please_negotiate && !tn->already_negotiated) {
|
|
negotiate(conn);
|
|
tn->already_negotiated = 1;
|
|
}
|
|
}
|
|
}
|
|
if(data->set.timeout) {
|
|
struct timeval now; /* current time */
|
|
now = Curl_tvnow();
|
|
if(Curl_tvdiff(now, conn->created) >= data->set.timeout) {
|
|
failf(data, "Time-out");
|
|
code = CURLE_OPERATION_TIMEDOUT;
|
|
keepon = FALSE;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
/* mark this as "no further transfer wanted" */
|
|
Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
|
|
|
|
return code;
|
|
}
|
|
#endif
|