mirror of
https://github.com/curl/curl.git
synced 2024-12-03 06:20:31 +08:00
45fdb48189
unfolded telwrite() instead of being a separate single function
892 lines
17 KiB
C
892 lines
17 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) 2000, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* In order to be useful for every potential user, curl and libcurl are
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* dual-licensed under the MPL and the MIT/X-derivate licenses.
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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 MPL or the MIT/X-derivate
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* licenses. You may pick one of these licenses.
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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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* $Id$
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*****************************************************************************/
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#include "setup.h"
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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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#if defined(WIN32) && !defined(__GNUC__) || defined(__MINGW32__)
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#include <winsock.h>
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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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#include <sys/time.h>
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#include <sys/resource.h>
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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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#include <signal.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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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#endif
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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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#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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#define SUBBUFSIZE 512
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#define SB_CLEAR() subpointer = subbuffer;
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#define SB_TERM() { subend = subpointer; SB_CLEAR(); }
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#define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \
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*subpointer++ = (c); \
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}
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#define SB_GET() ((*subpointer++)&0xff)
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#define SB_PEEK() ((*subpointer)&0xff)
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#define SB_EOF() (subpointer >= subend)
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#define SB_LEN() (subend - subpointer)
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static
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void telrcv(struct UrlData *data,
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unsigned char *inbuf, /* Data received from socket */
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int count); /* Number of bytes received */
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static void printoption(struct UrlData *data,
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const char *direction,
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int cmd, int option);
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static void negotiate(struct UrlData *data);
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static void send_negotiation(struct UrlData *data, int cmd, int option);
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static void set_local_option(struct UrlData *data, int cmd, int option);
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static void set_remote_option(struct UrlData *data, int cmd, int option);
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static void printsub(struct UrlData *data,
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int direction, unsigned char *pointer, int length);
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static void suboption(struct UrlData *data);
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/* suboptions */
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static char subbuffer[SUBBUFSIZE];
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static char *subpointer, *subend; /* buffer for sub-options */
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/*
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* Telnet receiver states for fsm
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*/
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static enum
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{
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TS_DATA = 0,
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TS_IAC,
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TS_WILL,
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TS_WONT,
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TS_DO,
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TS_DONT,
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TS_CR,
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TS_SB, /* sub-option collection */
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TS_SE /* looking for sub-option end */
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} telrcv_state;
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/* For negotiation compliant to RFC 1143 */
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#define NO 0
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#define YES 1
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#define WANTYES 2
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#define WANTNO 3
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#define EMPTY 0
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#define OPPOSITE 1
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static int us[256];
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static int usq[256];
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static int us_preferred[256];
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static int him[256];
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static int himq[256];
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static int him_preferred[256];
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static
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void init_telnet(struct UrlData *data)
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{
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telrcv_state = TS_DATA;
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/* Init suboptions */
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SB_CLEAR();
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/* Set all options to NO */
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memset(us, NO, 256);
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memset(usq, NO, 256);
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memset(us_preferred, NO, 256);
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memset(him, NO, 256);
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memset(himq, NO, 256);
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memset(him_preferred, NO, 256);
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/* Set the options we want */
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us_preferred[TELOPT_BINARY] = YES;
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us_preferred[TELOPT_SGA] = YES;
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him_preferred[TELOPT_BINARY] = YES;
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him_preferred[TELOPT_SGA] = YES;
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/* Start negotiating */
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negotiate(data);
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}
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static void negotiate(struct UrlData *data)
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{
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int i;
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for(i = 0;i < NTELOPTS;i++)
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{
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if(us_preferred[i] == YES)
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set_local_option(data, i, YES);
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if(him_preferred[i] == YES)
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set_remote_option(data, i, YES);
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}
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}
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static void printoption(struct UrlData *data,
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const char *direction, int cmd, int option)
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{
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char *fmt;
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char *opt;
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if (data->bits.verbose)
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{
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if (cmd == IAC)
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{
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if (TELCMD_OK(option))
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printf("%s IAC %s\n", direction, TELCMD(option));
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else
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printf("%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 == WILL) ? "WILL" : (cmd == WONT) ? "WONT" :
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(cmd == DO) ? "DO" : (cmd == DONT) ? "DONT" : 0;
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if (fmt)
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{
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if (TELOPT_OK(option))
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opt = TELOPT(option);
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else if (option == 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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printf("%s %s %s\n", direction, fmt, opt);
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else
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printf("%s %s %d\n", direction, fmt, option);
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}
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else
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printf("%s %d %d\n", direction, cmd, option);
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}
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}
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}
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static void send_negotiation(struct UrlData *data, int cmd, int option)
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{
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unsigned char buf[3];
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buf[0] = IAC;
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buf[1] = cmd;
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buf[2] = option;
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swrite(data->firstsocket, buf, 3);
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printoption(data, "SENT", cmd, option);
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}
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static
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void set_remote_option(struct UrlData *data, int option, int newstate)
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{
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if(newstate == YES)
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{
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switch(him[option])
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{
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case NO:
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him[option] = WANTYES;
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send_negotiation(data, DO, option);
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break;
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case YES:
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/* Already enabled */
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break;
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case WANTNO:
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switch(himq[option])
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{
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case EMPTY:
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/* Already negotiating for YES, queue the request */
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himq[option] = OPPOSITE;
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break;
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case 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 WANTYES:
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switch(himq[option])
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{
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case EMPTY:
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/* Error: already negotiating for enable */
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break;
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case OPPOSITE:
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himq[option] = 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(him[option])
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{
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case NO:
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/* Already disabled */
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break;
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case YES:
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him[option] = WANTNO;
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send_negotiation(data, DONT, option);
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break;
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case WANTNO:
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switch(himq[option])
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{
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case EMPTY:
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/* Already negotiating for NO */
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break;
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case OPPOSITE:
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himq[option] = EMPTY;
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break;
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}
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break;
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case WANTYES:
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switch(himq[option])
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{
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case EMPTY:
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himq[option] = OPPOSITE;
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break;
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case 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 UrlData *data, int option)
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{
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switch(him[option])
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{
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case NO:
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if(him_preferred[option] == YES)
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{
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him[option] = YES;
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send_negotiation(data, DO, option);
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}
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else
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{
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send_negotiation(data, DONT, option);
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}
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break;
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case YES:
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/* Already enabled */
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break;
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case WANTNO:
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switch(himq[option])
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{
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case EMPTY:
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/* Error: DONT answered by WILL */
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him[option] = NO;
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break;
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case OPPOSITE:
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/* Error: DONT answered by WILL */
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him[option] = YES;
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himq[option] = EMPTY;
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break;
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}
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break;
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case WANTYES:
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switch(himq[option])
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{
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case EMPTY:
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him[option] = YES;
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break;
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case OPPOSITE:
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him[option] = WANTNO;
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himq[option] = EMPTY;
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send_negotiation(data, 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 UrlData *data, int option)
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{
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switch(him[option])
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{
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case NO:
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/* Already disabled */
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break;
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case YES:
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him[option] = NO;
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send_negotiation(data, DONT, option);
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break;
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case WANTNO:
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switch(himq[option])
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{
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case EMPTY:
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him[option] = NO;
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break;
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case OPPOSITE:
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him[option] = WANTYES;
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himq[option] = EMPTY;
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send_negotiation(data, DO, option);
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break;
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}
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break;
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case WANTYES:
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switch(himq[option])
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{
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case EMPTY:
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him[option] = NO;
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break;
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case OPPOSITE:
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him[option] = NO;
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himq[option] = 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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void set_local_option(struct UrlData *data, int option, int newstate)
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{
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if(newstate == YES)
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{
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switch(us[option])
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{
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case NO:
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us[option] = WANTYES;
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send_negotiation(data, WILL, option);
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break;
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case YES:
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/* Already enabled */
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break;
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case WANTNO:
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switch(usq[option])
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{
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case EMPTY:
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/* Already negotiating for YES, queue the request */
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usq[option] = OPPOSITE;
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break;
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case 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 WANTYES:
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switch(usq[option])
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{
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case EMPTY:
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/* Error: already negotiating for enable */
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break;
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case OPPOSITE:
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usq[option] = 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(us[option])
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{
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case NO:
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/* Already disabled */
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break;
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case YES:
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us[option] = WANTNO;
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send_negotiation(data, WONT, option);
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break;
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case WANTNO:
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switch(usq[option])
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{
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case EMPTY:
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/* Already negotiating for NO */
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break;
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case OPPOSITE:
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usq[option] = EMPTY;
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break;
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}
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break;
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case WANTYES:
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switch(usq[option])
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{
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case EMPTY:
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usq[option] = OPPOSITE;
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break;
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case 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_do(struct UrlData *data, int option)
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{
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switch(us[option])
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{
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case NO:
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if(us_preferred[option] == YES)
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{
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us[option] = YES;
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send_negotiation(data, WILL, option);
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}
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else
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{
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send_negotiation(data, WONT, option);
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}
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break;
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case YES:
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/* Already enabled */
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break;
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case WANTNO:
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switch(usq[option])
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{
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case EMPTY:
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/* Error: DONT answered by WILL */
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us[option] = NO;
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break;
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case OPPOSITE:
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/* Error: DONT answered by WILL */
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us[option] = YES;
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usq[option] = EMPTY;
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break;
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}
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break;
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case WANTYES:
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switch(usq[option])
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{
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case EMPTY:
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us[option] = YES;
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break;
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case OPPOSITE:
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us[option] = WANTNO;
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himq[option] = EMPTY;
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send_negotiation(data, WONT, 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_dont(struct UrlData *data, int option)
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{
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switch(us[option])
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{
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case NO:
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/* Already disabled */
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break;
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case YES:
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us[option] = NO;
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send_negotiation(data, WONT, option);
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break;
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case WANTNO:
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switch(usq[option])
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{
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case EMPTY:
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us[option] = NO;
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break;
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case OPPOSITE:
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us[option] = WANTYES;
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usq[option] = EMPTY;
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send_negotiation(data, WILL, option);
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break;
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}
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break;
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case WANTYES:
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switch(usq[option])
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{
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case EMPTY:
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us[option] = NO;
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break;
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case OPPOSITE:
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us[option] = NO;
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usq[option] = 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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|
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static void printsub(struct UrlData *data,
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int direction, /* '<' or '>' */
|
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unsigned char *pointer, /* where suboption data is */
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int length) /* length of suboption data */
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|
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{
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int i = 0;
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if (data->bits.verbose)
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{
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if (direction)
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{
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printf("%s IAC SB ", (direction == '<')? "RCVD":"SENT");
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if (length >= 3)
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{
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int j;
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i = pointer[length-2];
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j = pointer[length-1];
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if (i != IAC || j != SE)
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{
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printf("(terminated by ");
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if (TELOPT_OK(i))
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printf("%s ", TELOPT(i));
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else if (TELCMD_OK(i))
|
|
printf("%s ", TELCMD(i));
|
|
else
|
|
printf("%d ", i);
|
|
if (TELOPT_OK(j))
|
|
printf("%s", TELOPT(j));
|
|
else if (TELCMD_OK(j))
|
|
printf("%s", TELCMD(j));
|
|
else
|
|
printf("%d", j);
|
|
printf(", not IAC SE!) ");
|
|
}
|
|
}
|
|
length -= 2;
|
|
}
|
|
if (length < 1)
|
|
{
|
|
printf("(Empty suboption?)");
|
|
return;
|
|
}
|
|
|
|
if (TELOPT_OK(pointer[0]))
|
|
printf("%s (unknown)", TELOPT(pointer[0]));
|
|
else
|
|
printf("%d (unknown)", pointer[i]);
|
|
for (i = 1; i < length; i++)
|
|
printf(" %d", pointer[i]);
|
|
|
|
if (direction)
|
|
{
|
|
printf("\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* suboption()
|
|
*
|
|
* Look at the sub-option buffer, and try to be helpful to the other
|
|
* side.
|
|
* No suboptions are supported yet.
|
|
*/
|
|
|
|
static void suboption(struct UrlData *data)
|
|
{
|
|
printsub(data, '<', (unsigned char *)subbuffer, SB_LEN()+2);
|
|
return;
|
|
}
|
|
|
|
static
|
|
void telrcv(struct UrlData *data,
|
|
unsigned char *inbuf, /* Data received from socket */
|
|
int count) /* Number of bytes received */
|
|
{
|
|
unsigned char c;
|
|
int index = 0;
|
|
|
|
while(count--)
|
|
{
|
|
c = inbuf[index++];
|
|
|
|
switch (telrcv_state)
|
|
{
|
|
case TS_CR:
|
|
telrcv_state = TS_DATA;
|
|
if (c == '\0')
|
|
{
|
|
break; /* Ignore \0 after CR */
|
|
}
|
|
|
|
Curl_client_write(data, CLIENTWRITE_BODY, (char *)&c, 1);
|
|
continue;
|
|
|
|
case TS_DATA:
|
|
if (c == IAC)
|
|
{
|
|
telrcv_state = TS_IAC;
|
|
break;
|
|
}
|
|
else if(c == '\r')
|
|
{
|
|
telrcv_state = TS_CR;
|
|
}
|
|
|
|
Curl_client_write(data, CLIENTWRITE_BODY, (char *)&c, 1);
|
|
continue;
|
|
|
|
case TS_IAC:
|
|
process_iac:
|
|
switch (c)
|
|
{
|
|
case WILL:
|
|
telrcv_state = TS_WILL;
|
|
continue;
|
|
case WONT:
|
|
telrcv_state = TS_WONT;
|
|
continue;
|
|
case DO:
|
|
telrcv_state = TS_DO;
|
|
continue;
|
|
case DONT:
|
|
telrcv_state = TS_DONT;
|
|
continue;
|
|
case SB:
|
|
SB_CLEAR();
|
|
telrcv_state = TS_SB;
|
|
continue;
|
|
case IAC:
|
|
Curl_client_write(data, CLIENTWRITE_BODY, (char *)&c, 1);
|
|
break;
|
|
case DM:
|
|
case NOP:
|
|
case GA:
|
|
default:
|
|
printoption(data, "RCVD", IAC, c);
|
|
break;
|
|
}
|
|
telrcv_state = TS_DATA;
|
|
continue;
|
|
|
|
case TS_WILL:
|
|
printoption(data, "RCVD", WILL, c);
|
|
rec_will(data, c);
|
|
telrcv_state = TS_DATA;
|
|
continue;
|
|
|
|
case TS_WONT:
|
|
printoption(data, "RCVD", WONT, c);
|
|
rec_wont(data, c);
|
|
telrcv_state = TS_DATA;
|
|
continue;
|
|
|
|
case TS_DO:
|
|
printoption(data, "RCVD", DO, c);
|
|
rec_do(data, c);
|
|
telrcv_state = TS_DATA;
|
|
continue;
|
|
|
|
case TS_DONT:
|
|
printoption(data, "RCVD", DONT, c);
|
|
rec_dont(data, c);
|
|
telrcv_state = TS_DATA;
|
|
continue;
|
|
|
|
case TS_SB:
|
|
if (c == IAC)
|
|
{
|
|
telrcv_state = TS_SE;
|
|
}
|
|
else
|
|
{
|
|
SB_ACCUM(c);
|
|
}
|
|
continue;
|
|
|
|
case TS_SE:
|
|
if (c != SE)
|
|
{
|
|
if (c != 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.
|
|
*/
|
|
SB_ACCUM((unsigned char)IAC);
|
|
SB_ACCUM(c);
|
|
subpointer -= 2;
|
|
SB_TERM();
|
|
|
|
printoption(data, "In SUBOPTION processing, RCVD", IAC, c);
|
|
suboption(data); /* handle sub-option */
|
|
telrcv_state = TS_IAC;
|
|
goto process_iac;
|
|
}
|
|
SB_ACCUM(c);
|
|
telrcv_state = TS_SB;
|
|
}
|
|
else
|
|
{
|
|
SB_ACCUM((unsigned char)IAC);
|
|
SB_ACCUM((unsigned char)SE);
|
|
subpointer -= 2;
|
|
SB_TERM();
|
|
suboption(data); /* handle sub-option */
|
|
telrcv_state = TS_DATA;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
CURLcode Curl_telnet_done(struct connectdata *conn)
|
|
{
|
|
return CURLE_OK;
|
|
}
|
|
|
|
CURLcode Curl_telnet(struct connectdata *conn)
|
|
{
|
|
struct UrlData *data = conn->data;
|
|
int sockfd = data->firstsocket;
|
|
fd_set readfd;
|
|
fd_set keepfd;
|
|
|
|
bool keepon = TRUE;
|
|
char *buf = data->buffer;
|
|
size_t nread;
|
|
|
|
init_telnet(data);
|
|
|
|
FD_ZERO (&readfd); /* clear it */
|
|
FD_SET (sockfd, &readfd);
|
|
FD_SET (1, &readfd);
|
|
|
|
keepfd = readfd;
|
|
|
|
while (keepon) {
|
|
readfd = keepfd; /* set this every lap in the loop */
|
|
|
|
switch (select (sockfd + 1, &readfd, NULL, NULL, NULL)) {
|
|
case -1: /* error, stop reading */
|
|
keepon = FALSE;
|
|
continue;
|
|
case 0: /* timeout */
|
|
break;
|
|
default: /* read! */
|
|
if(FD_ISSET(1, &readfd)) { /* read from stdin */
|
|
unsigned char outbuf[2];
|
|
int out_count = 0;
|
|
size_t bytes_written;
|
|
char *buffer = buf;
|
|
|
|
nread = read(1, buf, 255);
|
|
|
|
while(nread--) {
|
|
outbuf[0] = *buffer++;
|
|
out_count = 1;
|
|
if(outbuf[0] == IAC)
|
|
outbuf[out_count++] = IAC;
|
|
|
|
Curl_write(conn, data->firstsocket, outbuf,
|
|
out_count, &bytes_written);
|
|
}
|
|
}
|
|
|
|
if(FD_ISSET(sockfd, &readfd))
|
|
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(data, (unsigned char *)buf, nread);
|
|
}
|
|
}
|
|
return CURLE_OK;
|
|
}
|
|
|
|
|