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quadrilateralcowboy/curl/lib/telnet.c
brendon 47a1010d23 Initial commit
2020-06-12 14:06:25 -07:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id: telnet.c,v 1.57 2004/03/11 13:13:35 bagder Exp $
***************************************************************************/
#include "setup.h"
#ifndef CURL_DISABLE_TELNET
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#if defined(WIN32)
#include <time.h>
#include <io.h>
#else
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <netinet/in.h>
#include <sys/time.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <netdb.h>
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#include <sys/ioctl.h>
#include <signal.h>
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#endif
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "telnet.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#define TELOPTS
#define TELCMDS
#include "arpa_telnet.h"
/* The last #include file should be: */
#ifdef CURLDEBUG
#include "memdebug.h"
#endif
#define SUBBUFSIZE 512
#define CURL_SB_CLEAR(x) x->subpointer = x->subbuffer;
#define CURL_SB_TERM(x) { x->subend = x->subpointer; CURL_SB_CLEAR(x); }
#define CURL_SB_ACCUM(x,c) \
if (x->subpointer < (x->subbuffer+sizeof x->subbuffer)) { \
*x->subpointer++ = (c); \
}
#define CURL_SB_GET(x) ((*x->subpointer++)&0xff)
#define CURL_SB_PEEK(x) ((*x->subpointer)&0xff)
#define CURL_SB_EOF(x) (x->subpointer >= x->subend)
#define CURL_SB_LEN(x) (x->subend - x->subpointer)
#ifdef WIN32
typedef FARPROC WSOCK2_FUNC;
static CURLcode check_wsock2 ( struct SessionHandle *data );
#endif
static
void telrcv(struct connectdata *,
unsigned char *inbuf, /* Data received from socket */
int count); /* Number of bytes received */
static void printoption(struct SessionHandle *data,
const char *direction,
int cmd, int option);
static void negotiate(struct connectdata *);
static void send_negotiation(struct connectdata *, int cmd, int option);
static void set_local_option(struct connectdata *, int cmd, int option);
static void set_remote_option(struct connectdata *, int cmd, int option);
static void printsub(struct SessionHandle *data,
int direction, unsigned char *pointer, int length);
static void suboption(struct connectdata *);
/* For negotiation compliant to RFC 1143 */
#define CURL_NO 0
#define CURL_YES 1
#define CURL_WANTYES 2
#define CURL_WANTNO 3
#define CURL_EMPTY 0
#define CURL_OPPOSITE 1
/*
* Telnet receiver states for fsm
*/
typedef enum
{
CURL_TS_DATA = 0,
CURL_TS_IAC,
CURL_TS_WILL,
CURL_TS_WONT,
CURL_TS_DO,
CURL_TS_DONT,
CURL_TS_CR,
CURL_TS_SB, /* sub-option collection */
CURL_TS_SE /* looking for sub-option end */
} TelnetReceive;
struct TELNET {
int please_negotiate;
int already_negotiated;
int us[256];
int usq[256];
int us_preferred[256];
int him[256];
int himq[256];
int him_preferred[256];
char subopt_ttype[32]; /* Set with suboption TTYPE */
char subopt_xdisploc[128]; /* Set with suboption XDISPLOC */
struct curl_slist *telnet_vars; /* Environment variables */
/* suboptions */
char subbuffer[SUBBUFSIZE];
char *subpointer, *subend; /* buffer for sub-options */
TelnetReceive telrcv_state;
};
#ifdef WIN32
static CURLcode
check_wsock2 ( struct SessionHandle *data )
{
int err;
WORD wVersionRequested;
WSADATA wsaData;
curlassert(data);
/* telnet requires at least WinSock 2.0 so ask for it. */
wVersionRequested = MAKEWORD(2, 0);
err = WSAStartup(wVersionRequested, &wsaData);
/* We must've called this once already, so this call */
/* should always succeed. But, just in case... */
if (err != 0) {
failf(data,"WSAStartup failed (%d)",err);
return CURLE_FAILED_INIT;
}
/* We have to have a WSACleanup call for every successful */
/* WSAStartup call. */
WSACleanup();
/* Check that our version is supported */
if (LOBYTE(wsaData.wVersion) != LOBYTE(wVersionRequested) ||
HIBYTE(wsaData.wVersion) != HIBYTE(wVersionRequested)) {
/* Our version isn't supported */
failf(data,"insufficient winsock version to support "
"telnet");
return CURLE_FAILED_INIT;
}
/* Our version is supported */
return CURLE_OK;
}
#endif
static
CURLcode init_telnet(struct connectdata *conn)
{
struct TELNET *tn;
tn = (struct TELNET *)malloc(sizeof(struct TELNET));
if(!tn)
return CURLE_OUT_OF_MEMORY;
conn->proto.telnet = (void *)tn; /* make us known */
memset(tn, 0, sizeof(struct TELNET));
tn->telrcv_state = CURL_TS_DATA;
/* Init suboptions */
CURL_SB_CLEAR(tn);
/* Set all options to NO */
#if 0
/* NO is zero => default fill pattern */
memset(tn->us, CURL_NO, 256);
memset(tn->usq, CURL_NO, 256);
memset(tn->us_preferred, CURL_NO, 256);
memset(tn->him, CURL_NO, 256);
memset(tn->himq, CURL_NO, 256);
memset(tn->him_preferred, CURL_NO, 256);
#endif
/* Set the options we want by default */
tn->us_preferred[CURL_TELOPT_BINARY] = CURL_YES;
tn->us_preferred[CURL_TELOPT_SGA] = CURL_YES;
tn->him_preferred[CURL_TELOPT_BINARY] = CURL_YES;
tn->him_preferred[CURL_TELOPT_SGA] = CURL_YES;
return CURLE_OK;
}
static void negotiate(struct connectdata *conn)
{
int i;
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
for(i = 0;i < CURL_NTELOPTS;i++)
{
if(tn->us_preferred[i] == CURL_YES)
set_local_option(conn, i, CURL_YES);
if(tn->him_preferred[i] == CURL_YES)
set_remote_option(conn, i, CURL_YES);
}
}
static void printoption(struct SessionHandle *data,
const char *direction, int cmd, int option)
{
const char *fmt;
const char *opt;
if (data->set.verbose)
{
if (cmd == CURL_IAC)
{
if (CURL_TELCMD_OK(option))
Curl_infof(data, "%s IAC %s\n", direction, CURL_TELCMD(option));
else
Curl_infof(data, "%s IAC %d\n", direction, option);
}
else
{
fmt = (cmd == CURL_WILL) ? "WILL" : (cmd == CURL_WONT) ? "WONT" :
(cmd == CURL_DO) ? "DO" : (cmd == CURL_DONT) ? "DONT" : 0;
if (fmt)
{
if (CURL_TELOPT_OK(option))
opt = CURL_TELOPT(option);
else if (option == CURL_TELOPT_EXOPL)
opt = "EXOPL";
else
opt = NULL;
if(opt)
Curl_infof(data, "%s %s %s\n", direction, fmt, opt);
else
Curl_infof(data, "%s %s %d\n", direction, fmt, option);
}
else
Curl_infof(data, "%s %d %d\n", direction, cmd, option);
}
}
}
static void send_negotiation(struct connectdata *conn, int cmd, int option)
{
unsigned char buf[3];
buf[0] = CURL_IAC;
buf[1] = cmd;
buf[2] = option;
(void)swrite(conn->sock[FIRSTSOCKET], buf, 3);
printoption(conn->data, "SENT", cmd, option);
}
static
void set_remote_option(struct connectdata *conn, int option, int newstate)
{
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
if(newstate == CURL_YES)
{
switch(tn->him[option])
{
case CURL_NO:
tn->him[option] = CURL_WANTYES;
send_negotiation(conn, CURL_DO, option);
break;
case CURL_YES:
/* Already enabled */
break;
case CURL_WANTNO:
switch(tn->himq[option])
{
case CURL_EMPTY:
/* Already negotiating for CURL_YES, queue the request */
tn->himq[option] = CURL_OPPOSITE;
break;
case CURL_OPPOSITE:
/* Error: already queued an enable request */
break;
}
break;
case CURL_WANTYES:
switch(tn->himq[option])
{
case CURL_EMPTY:
/* Error: already negotiating for enable */
break;
case CURL_OPPOSITE:
tn->himq[option] = CURL_EMPTY;
break;
}
break;
}
}
else /* NO */
{
switch(tn->him[option])
{
case CURL_NO:
/* Already disabled */
break;
case CURL_YES:
tn->him[option] = CURL_WANTNO;
send_negotiation(conn, CURL_DONT, option);
break;
case CURL_WANTNO:
switch(tn->himq[option])
{
case CURL_EMPTY:
/* Already negotiating for NO */
break;
case CURL_OPPOSITE:
tn->himq[option] = CURL_EMPTY;
break;
}
break;
case CURL_WANTYES:
switch(tn->himq[option])
{
case CURL_EMPTY:
tn->himq[option] = CURL_OPPOSITE;
break;
case CURL_OPPOSITE:
break;
}
break;
}
}
}
static
void rec_will(struct connectdata *conn, int option)
{
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
switch(tn->him[option])
{
case CURL_NO:
if(tn->him_preferred[option] == CURL_YES)
{
tn->him[option] = CURL_YES;
send_negotiation(conn, CURL_DO, option);
}
else
{
send_negotiation(conn, CURL_DONT, option);
}
break;
case CURL_YES:
/* Already enabled */
break;
case CURL_WANTNO:
switch(tn->himq[option])
{
case CURL_EMPTY:
/* Error: DONT answered by WILL */
tn->him[option] = CURL_NO;
break;
case CURL_OPPOSITE:
/* Error: DONT answered by WILL */
tn->him[option] = CURL_YES;
tn->himq[option] = CURL_EMPTY;
break;
}
break;
case CURL_WANTYES:
switch(tn->himq[option])
{
case CURL_EMPTY:
tn->him[option] = CURL_YES;
break;
case CURL_OPPOSITE:
tn->him[option] = CURL_WANTNO;
tn->himq[option] = CURL_EMPTY;
send_negotiation(conn, CURL_DONT, option);
break;
}
break;
}
}
static
void rec_wont(struct connectdata *conn, int option)
{
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
switch(tn->him[option])
{
case CURL_NO:
/* Already disabled */
break;
case CURL_YES:
tn->him[option] = CURL_NO;
send_negotiation(conn, CURL_DONT, option);
break;
case CURL_WANTNO:
switch(tn->himq[option])
{
case CURL_EMPTY:
tn->him[option] = CURL_NO;
break;
case CURL_OPPOSITE:
tn->him[option] = CURL_WANTYES;
tn->himq[option] = CURL_EMPTY;
send_negotiation(conn, CURL_DO, option);
break;
}
break;
case CURL_WANTYES:
switch(tn->himq[option])
{
case CURL_EMPTY:
tn->him[option] = CURL_NO;
break;
case CURL_OPPOSITE:
tn->him[option] = CURL_NO;
tn->himq[option] = CURL_EMPTY;
break;
}
break;
}
}
static void
set_local_option(struct connectdata *conn, int option, int newstate)
{
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
if(newstate == CURL_YES)
{
switch(tn->us[option])
{
case CURL_NO:
tn->us[option] = CURL_WANTYES;
send_negotiation(conn, CURL_WILL, option);
break;
case CURL_YES:
/* Already enabled */
break;
case CURL_WANTNO:
switch(tn->usq[option])
{
case CURL_EMPTY:
/* Already negotiating for CURL_YES, queue the request */
tn->usq[option] = CURL_OPPOSITE;
break;
case CURL_OPPOSITE:
/* Error: already queued an enable request */
break;
}
break;
case CURL_WANTYES:
switch(tn->usq[option])
{
case CURL_EMPTY:
/* Error: already negotiating for enable */
break;
case CURL_OPPOSITE:
tn->usq[option] = CURL_EMPTY;
break;
}
break;
}
}
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->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->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 */
int length) /* length of suboption data */
{
int i = 0;
if (data->set.verbose)
{
if (direction)
{
Curl_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)
{
Curl_infof(data, "(terminated by ");
if (CURL_TELOPT_OK(i))
Curl_infof(data, "%s ", CURL_TELOPT(i));
else if (CURL_TELCMD_OK(i))
Curl_infof(data, "%s ", CURL_TELCMD(i));
else
Curl_infof(data, "%d ", i);
if (CURL_TELOPT_OK(j))
Curl_infof(data, "%s", CURL_TELOPT(j));
else if (CURL_TELCMD_OK(j))
Curl_infof(data, "%s", CURL_TELCMD(j));
else
Curl_infof(data, "%d", j);
Curl_infof(data, ", not IAC SE!) ");
}
}
length -= 2;
}
if (length < 1)
{
Curl_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:
Curl_infof(data, "%s", CURL_TELOPT(pointer[0]));
break;
default:
Curl_infof(data, "%s (unsupported)", CURL_TELOPT(pointer[0]));
break;
}
}
else
Curl_infof(data, "%d (unknown)", pointer[i]);
switch(pointer[1]) {
case CURL_TELQUAL_IS:
Curl_infof(data, " IS");
break;
case CURL_TELQUAL_SEND:
Curl_infof(data, " SEND");
break;
case CURL_TELQUAL_INFO:
Curl_infof(data, " INFO/REPLY");
break;
case CURL_TELQUAL_NAME:
Curl_infof(data, " NAME");
break;
}
switch(pointer[0]) {
case CURL_TELOPT_TTYPE:
case CURL_TELOPT_XDISPLOC:
pointer[length] = 0;
Curl_infof(data, " \"%s\"", &pointer[2]);
break;
case CURL_TELOPT_NEW_ENVIRON:
if(pointer[1] == CURL_TELQUAL_IS) {
Curl_infof(data, " ");
for(i = 3;i < length;i++) {
switch(pointer[i]) {
case CURL_NEW_ENV_VAR:
Curl_infof(data, ", ");
break;
case CURL_NEW_ENV_VALUE:
Curl_infof(data, " = ");
break;
default:
Curl_infof(data, "%c", pointer[i]);
break;
}
}
}
break;
default:
for (i = 2; i < length; i++)
Curl_infof(data, " %.2x", pointer[i]);
break;
}
if (direction)
{
Curl_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->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_strequal(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_strequal(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_strequal(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];
int len;
int tmplen;
char varname[128];
char varval[128];
struct SessionHandle *data = conn->data;
struct TELNET *tn = (struct TELNET *)conn->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);
(void)swrite(conn->sock[FIRSTSOCKET], temp, len);
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);
(void)swrite(conn->sock[FIRSTSOCKET], temp, len);
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[^,],%s", 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;
(void)swrite(conn->sock[FIRSTSOCKET], temp, len);
printsub(data, '>', &temp[2], len-2);
break;
}
return;
}
static
void telrcv(struct connectdata *conn,
unsigned char *inbuf, /* Data received from socket */
int count) /* Number of bytes received */
{
unsigned char c;
int in = 0;
struct SessionHandle *data = conn->data;
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
while(count--)
{
c = inbuf[in++];
switch (tn->telrcv_state)
{
case CURL_TS_CR:
tn->telrcv_state = CURL_TS_DATA;
if (c == '\0')
{
break; /* Ignore \0 after CR */
}
Curl_client_write(data, CLIENTWRITE_BODY, (char *)&c, 1);
continue;
case CURL_TS_DATA:
if (c == CURL_IAC)
{
tn->telrcv_state = CURL_TS_IAC;
break;
}
else if(c == '\r')
{
tn->telrcv_state = CURL_TS_CR;
}
Curl_client_write(data, CLIENTWRITE_BODY, (char *)&c, 1);
continue;
case CURL_TS_IAC:
process_iac:
switch (c)
{
case CURL_WILL:
tn->telrcv_state = CURL_TS_WILL;
continue;
case CURL_WONT:
tn->telrcv_state = CURL_TS_WONT;
continue;
case CURL_DO:
tn->telrcv_state = CURL_TS_DO;
continue;
case CURL_DONT:
tn->telrcv_state = CURL_TS_DONT;
continue;
case CURL_SB:
CURL_SB_CLEAR(tn);
tn->telrcv_state = CURL_TS_SB;
continue;
case CURL_IAC:
Curl_client_write(data, CLIENTWRITE_BODY, (char *)&c, 1);
break;
case CURL_DM:
case CURL_NOP:
case CURL_GA:
default:
printoption(data, "RCVD", CURL_IAC, c);
break;
}
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_WILL:
printoption(data, "RCVD", CURL_WILL, c);
tn->please_negotiate = 1;
rec_will(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_WONT:
printoption(data, "RCVD", CURL_WONT, c);
tn->please_negotiate = 1;
rec_wont(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_DO:
printoption(data, "RCVD", CURL_DO, c);
tn->please_negotiate = 1;
rec_do(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_DONT:
printoption(data, "RCVD", CURL_DONT, c);
tn->please_negotiate = 1;
rec_dont(conn, c);
tn->telrcv_state = CURL_TS_DATA;
continue;
case CURL_TS_SB:
if (c == CURL_IAC)
{
tn->telrcv_state = CURL_TS_SE;
}
else
{
CURL_SB_ACCUM(tn,c);
}
continue;
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, (unsigned char)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, (unsigned char)CURL_IAC);
CURL_SB_ACCUM(tn, (unsigned char)CURL_SE);
tn->subpointer -= 2;
CURL_SB_TERM(tn);
suboption(conn); /* handle sub-option */
tn->telrcv_state = CURL_TS_DATA;
}
break;
}
}
}
CURLcode Curl_telnet_done(struct connectdata *conn)
{
struct TELNET *tn = (struct TELNET *)conn->proto.telnet;
curl_slist_free_all(tn->telnet_vars);
free(conn->proto.telnet);
conn->proto.telnet = NULL;
return CURLE_OK;
}
CURLcode Curl_telnet(struct connectdata *conn)
{
CURLcode code;
struct SessionHandle *data = conn->data;
curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
#ifdef WIN32
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 waitret;
DWORD readfile_read;
#else
fd_set readfd;
fd_set keepfd;
#endif
ssize_t nread;
bool keepon = TRUE;
char *buf = data->state.buffer;
struct TELNET *tn;
code = init_telnet(conn);
if(code)
return code;
tn = (struct TELNET *)conn->proto.telnet;
code = check_telnet_options(conn);
if(code)
return code;
#ifdef WIN32
/*
** 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)",GetLastError());
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)",
GetLastError());
FreeLibrary(wsock2);
return CURLE_FAILED_INIT;
}
/* And WSACloseEvent */
close_event_func = GetProcAddress(wsock2,"WSACloseEvent");
if (create_event_func == NULL) {
failf(data,"failed to find WSACloseEvent function (%d)",
GetLastError());
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)",
GetLastError());
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)",
GetLastError());
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)",WSAGetLastError());
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] = stdin_handle;
objs[1] = event_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 0;
}
/* Keep on listening and act on events */
while(keepon) {
waitret = WaitForMultipleObjects(2, objs, FALSE, INFINITE);
switch(waitret - WAIT_OBJECT_0) {
case 0:
{
unsigned char outbuf[2];
int out_count = 0;
ssize_t bytes_written;
char *buffer = buf;
if(!ReadFile(stdin_handle, buf, sizeof(data->state.buffer),
&readfile_read, NULL)) {
keepon = FALSE;
break;
}
nread = readfile_read;
while(nread--) {
outbuf[0] = *buffer++;
out_count = 1;
if(outbuf[0] == CURL_IAC)
outbuf[out_count++] = CURL_IAC;
Curl_write(conn, conn->sock[FIRSTSOCKET], outbuf,
out_count, &bytes_written);
}
}
break;
case 1:
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)",WSAGetLastError());
}
/* "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)",GetLastError());
#else
FD_ZERO (&readfd); /* clear it */
FD_SET (sockfd, &readfd);
FD_SET (0, &readfd);
keepfd = readfd;
while (keepon) {
struct timeval interval;
readfd = keepfd; /* set this every lap in the loop */
interval.tv_sec = 1;
interval.tv_usec = 0;
switch (select (sockfd + 1, &readfd, NULL, NULL, &interval)) {
case -1: /* error, stop reading */
keepon = FALSE;
continue;
case 0: /* timeout */
break;
default: /* read! */
if(FD_ISSET(0, &readfd)) { /* read from stdin */
unsigned char outbuf[2];
int out_count = 0;
ssize_t bytes_written;
char *buffer = buf;
nread = read(0, buf, 255);
while(nread--) {
outbuf[0] = *buffer++;
out_count = 1;
if(outbuf[0] == CURL_IAC)
outbuf[out_count++] = CURL_IAC;
Curl_write(conn, conn->sock[FIRSTSOCKET], outbuf,
out_count, &bytes_written);
}
}
if(FD_ISSET(sockfd, &readfd)) {
/* 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)/1000 >= data->set.timeout) {
failf(data, "Time-out");
code = CURLE_OPERATION_TIMEOUTED;
keepon = FALSE;
}
}
}
#endif
/* mark this as "no further transfer wanted" */
Curl_Transfer(conn, -1, -1, FALSE, NULL, -1, NULL);
return code;
}
#endif
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