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curl/lib/telnet.c
Dan Fandrich 9f44a95522 Renamed several libcurl error codes and options to make them more general 
and allow reuse by multiple protocols. Several unused error codes were
removed.  In all cases, macros were added to preserve source (and binary)
compatibility with the old names.  These macros are subject to removal at
a future date, but probably not before 2009.  An application can be
tested to see if it is using any obsolete code by compiling it with the
CURL_NO_OLDIES macro defined.

Documented some newer error codes in libcurl-error(3)
2007-08-30 20:34:57 +00:00

1405 lines
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, 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.
*
* $Id$
***************************************************************************/
#include "setup.h"
#ifndef CURL_DISABLE_TELNET
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.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>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#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
#endif /* WIN32 */
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "telnet.h"
#include "connect.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#define TELOPTS
#define TELCMDS
#include "arpa_telnet.h"
#include "memory.h"
#include "select.h"
/* The last #include file should be: */
#include "memdebug.h"
#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 CURL_DISABLE_VERBOSE_STRINGS
#define printoption(a,b,c,d) do { } while (0)
#endif
#ifdef USE_WINSOCK
typedef FARPROC WSOCK2_FUNC;
static CURLcode check_wsock2 ( struct SessionHandle *data );
#endif
static
void telrcv(struct connectdata *,
unsigned char *inbuf, /* Data received from socket */
ssize_t count); /* Number of bytes received */
#ifndef CURL_DISABLE_VERBOSE_STRINGS
static void printoption(struct SessionHandle *data,
const char *direction,
int cmd, int option);
#endif
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,
size_t 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 */
unsigned char subbuffer[SUBBUFSIZE];
unsigned char *subpointer, *subend; /* buffer for sub-options */
TelnetReceive telrcv_state;
};
#ifdef USE_WINSOCK
static CURLcode
check_wsock2 ( struct SessionHandle *data )
{
int err;
WORD wVersionRequested;
WSADATA wsaData;
DEBUGASSERT(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 *)calloc(1, sizeof(struct TELNET));
if(!tn)
return CURLE_OUT_OF_MEMORY;
conn->data->reqdata.proto.telnet = (void *)tn; /* make us known */
tn->telrcv_state = CURL_TS_DATA;
/* Init suboptions */
CURL_SB_CLEAR(tn);
/* 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->data->reqdata.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);
}
}
#ifndef CURL_DISABLE_VERBOSE_STRINGS
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))
infof(data, "%s IAC %s\n", direction, CURL_TELCMD(option));
else
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)
infof(data, "%s %s %s\n", direction, fmt, opt);
else
infof(data, "%s %s %d\n", direction, fmt, option);
}
else
infof(data, "%s %d %d\n", direction, cmd, option);
}
}
}
#endif
static void send_negotiation(struct connectdata *conn, int cmd, int option)
{
unsigned char buf[3];
ssize_t bytes_written;
int err;
struct SessionHandle *data = conn->data;
buf[0] = CURL_IAC;
buf[1] = (unsigned char)cmd;
buf[2] = (unsigned char)option;
bytes_written = swrite(conn->sock[FIRSTSOCKET], buf, 3);
if(bytes_written < 0) {
err = SOCKERRNO;
failf(data,"Sending data failed (%d)",err);
}
printoption(conn->data, "SENT", cmd, option);
}
static
void set_remote_option(struct connectdata *conn, int option, int newstate)
{
struct TELNET *tn = (struct TELNET *)conn->data->reqdata.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->data->reqdata.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->data->reqdata.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->data->reqdata.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->data->reqdata.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->reqdata.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->reqdata.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];
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->reqdata.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,
unsigned char *inbuf, /* Data received from socket */
ssize_t count) /* Number of bytes received */
{
unsigned char c;
int in = 0;
struct SessionHandle *data = conn->data;
struct TELNET *tn = (struct TELNET *)data->reqdata.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(conn, 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(conn, 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(conn, 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, 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;
}
}
}
CURLcode Curl_telnet_done(struct connectdata *conn, CURLcode status, bool premature)
{
struct TELNET *tn = (struct TELNET *)conn->data->reqdata.proto.telnet;
(void)status; /* unused */
(void)premature; /* not used */
curl_slist_free_all(tn->telnet_vars);
free(conn->data->reqdata.proto.telnet);
conn->data->reqdata.proto.telnet = NULL;
return CURLE_OK;
}
CURLcode Curl_telnet(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; /* uncontionally */
code = init_telnet(conn);
if(code)
return code;
tn = (struct TELNET *)data->reqdata.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 0;
}
/* 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:
{
unsigned char outbuf[2];
int out_count = 0;
ssize_t bytes_written;
char *buffer = buf;
while(1) {
if(!PeekNamedPipe(stdin_handle, NULL, 0, NULL, &readfile_read, NULL)) {
keepon = FALSE;
break;
}
nread = readfile_read;
if(!nread)
break;
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 WAIT_OBJECT_0 + 1:
{
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 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 */
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(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
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