forked from curl/curl
/
telnet.c
1700 lines (1505 loc) · 45.8 KB
/
telnet.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2018, 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 https://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.
*
***************************************************************************/
#include "curl_setup.h"
#ifndef CURL_DISABLE_TELNET
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include "urldata.h"
#include <curl/curl.h>
#include "transfer.h"
#include "sendf.h"
#include "telnet.h"
#include "connect.h"
#include "progress.h"
#include "system_win32.h"
#define TELOPTS
#define TELCMDS
#include "arpa_telnet.h"
#include "select.h"
#include "strcase.h"
#include "warnless.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
#define SUBBUFSIZE 512
#define CURL_SB_CLEAR(x) x->subpointer = x->subbuffer
#define CURL_SB_TERM(x) \
do { \
x->subend = x->subpointer; \
CURL_SB_CLEAR(x); \
} WHILE_FALSE
#define CURL_SB_ACCUM(x,c) \
do { \
if(x->subpointer < (x->subbuffer + sizeof(x->subbuffer))) \
*x->subpointer++ = (c); \
} WHILE_FALSE
#define CURL_SB_GET(x) ((*x->subpointer++)&0xff)
#define CURL_SB_LEN(x) (x->subend - x->subpointer)
/* For posterity:
#define CURL_SB_PEEK(x) ((*x->subpointer)&0xff)
#define CURL_SB_EOF(x) (x->subpointer >= x->subend) */
#ifdef CURL_DISABLE_VERBOSE_STRINGS
#define printoption(a,b,c,d) Curl_nop_stmt
#endif
#ifdef USE_WINSOCK
typedef FARPROC WSOCK2_FUNC;
static CURLcode check_wsock2(struct Curl_easy *data);
#endif
static
CURLcode telrcv(struct connectdata *,
const unsigned char *inbuf, /* Data received from socket */
ssize_t count); /* Number of bytes received */
#ifndef CURL_DISABLE_VERBOSE_STRINGS
static void printoption(struct Curl_easy *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 Curl_easy *data,
int direction, unsigned char *pointer,
size_t length);
static void suboption(struct connectdata *);
static void sendsuboption(struct connectdata *conn, int option);
static CURLcode telnet_do(struct connectdata *conn, bool *done);
static CURLcode telnet_done(struct connectdata *conn,
CURLcode, bool premature);
static CURLcode send_telnet_data(struct connectdata *conn,
char *buffer, ssize_t nread);
/* 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];
int subnegotiation[256];
char subopt_ttype[32]; /* Set with suboption TTYPE */
char subopt_xdisploc[128]; /* Set with suboption XDISPLOC */
unsigned short subopt_wsx; /* Set with suboption NAWS */
unsigned short subopt_wsy; /* Set with suboption NAWS */
struct curl_slist *telnet_vars; /* Environment variables */
/* suboptions */
unsigned char subbuffer[SUBBUFSIZE];
unsigned char *subpointer, *subend; /* buffer for sub-options */
TelnetReceive telrcv_state;
};
/*
* TELNET protocol handler.
*/
const struct Curl_handler Curl_handler_telnet = {
"TELNET", /* scheme */
ZERO_NULL, /* setup_connection */
telnet_do, /* do_it */
telnet_done, /* done */
ZERO_NULL, /* do_more */
ZERO_NULL, /* connect_it */
ZERO_NULL, /* connecting */
ZERO_NULL, /* doing */
ZERO_NULL, /* proto_getsock */
ZERO_NULL, /* doing_getsock */
ZERO_NULL, /* domore_getsock */
ZERO_NULL, /* perform_getsock */
ZERO_NULL, /* disconnect */
ZERO_NULL, /* readwrite */
ZERO_NULL, /* connection_check */
PORT_TELNET, /* defport */
CURLPROTO_TELNET, /* protocol */
PROTOPT_NONE | PROTOPT_NOURLQUERY /* flags */
};
#ifdef USE_WINSOCK
static CURLcode
check_wsock2(struct Curl_easy *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 = calloc(1, sizeof(struct TELNET));
if(!tn)
return CURLE_OUT_OF_MEMORY;
conn->data->req.protop = 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_SGA] = CURL_YES;
tn->him_preferred[CURL_TELOPT_SGA] = CURL_YES;
/* To be compliant with previous releases of libcurl
we enable this option by default. This behaviour
can be changed thanks to the "BINARY" option in
CURLOPT_TELNETOPTIONS
*/
tn->us_preferred[CURL_TELOPT_BINARY] = CURL_YES;
tn->him_preferred[CURL_TELOPT_BINARY] = CURL_YES;
/* We must allow the server to echo what we sent
but it is not necessary to request the server
to do so (it might forces the server to close
the connection). Hence, we ignore ECHO in the
negotiate function
*/
tn->him_preferred[CURL_TELOPT_ECHO] = CURL_YES;
/* Set the subnegotiation fields to send information
just after negotiation passed (do/will)
Default values are (0,0) initialized by calloc.
According to the RFC1013 it is valid:
A value equal to zero is acceptable for the width (or height),
and means that no character width (or height) is being sent.
In this case, the width (or height) that will be assumed by the
Telnet server is operating system specific (it will probably be
based upon the terminal type information that may have been sent
using the TERMINAL TYPE Telnet option). */
tn->subnegotiation[CURL_TELOPT_NAWS] = CURL_YES;
return CURLE_OK;
}
static void negotiate(struct connectdata *conn)
{
int i;
struct TELNET *tn = (struct TELNET *) conn->data->req.protop;
for(i = 0; i < CURL_NTELOPTS; i++) {
if(i == CURL_TELOPT_ECHO)
continue;
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 Curl_easy *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 Curl_easy *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->req.protop;
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->req.protop;
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->req.protop;
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->req.protop;
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->req.protop;
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);
if(tn->subnegotiation[option] == CURL_YES)
/* transmission of data option */
sendsuboption(conn, option);
}
else if(tn->subnegotiation[option] == CURL_YES) {
/* send information to achieve this option*/
tn->us[option] = CURL_YES;
send_negotiation(conn, CURL_WILL, option);
sendsuboption(conn, 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;
if(tn->subnegotiation[option] == CURL_YES) {
/* transmission of data option */
sendsuboption(conn, option);
}
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->req.protop;
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 Curl_easy *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, "%u ", 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:
case CURL_TELOPT_NAWS:
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[0]) {
case CURL_TELOPT_NAWS:
if(length > 4)
infof(data, "Width: %d ; Height: %d", (pointer[1]<<8) | pointer[2],
(pointer[3]<<8) | pointer[4]);
break;
default:
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;
struct curl_slist *beg;
char option_keyword[128] = "";
char option_arg[256] = "";
struct Curl_easy *data = conn->data;
struct TELNET *tn = (struct TELNET *)conn->data->req.protop;
CURLcode result = CURLE_OK;
int binary_option;
/* 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);
beg = curl_slist_append(tn->telnet_vars, option_arg);
if(!beg) {
curl_slist_free_all(tn->telnet_vars);
tn->telnet_vars = NULL;
return CURLE_OUT_OF_MEMORY;
}
tn->telnet_vars = beg;
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(strcasecompare(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(strcasecompare(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(strcasecompare(option_keyword, "NEW_ENV")) {
beg = curl_slist_append(tn->telnet_vars, option_arg);
if(!beg) {
result = CURLE_OUT_OF_MEMORY;
break;
}
tn->telnet_vars = beg;
tn->us_preferred[CURL_TELOPT_NEW_ENVIRON] = CURL_YES;
continue;
}
/* Window Size */
if(strcasecompare(option_keyword, "WS")) {
if(sscanf(option_arg, "%hu%*[xX]%hu",
&tn->subopt_wsx, &tn->subopt_wsy) == 2)
tn->us_preferred[CURL_TELOPT_NAWS] = CURL_YES;
else {
failf(data, "Syntax error in telnet option: %s", head->data);
result = CURLE_TELNET_OPTION_SYNTAX;
break;
}
continue;
}
/* To take care or not of the 8th bit in data exchange */
if(strcasecompare(option_keyword, "BINARY")) {
binary_option = atoi(option_arg);
if(binary_option != 1) {
tn->us_preferred[CURL_TELOPT_BINARY] = CURL_NO;
tn->him_preferred[CURL_TELOPT_BINARY] = CURL_NO;
}
continue;
}
failf(data, "Unknown telnet option %s", head->data);
result = CURLE_UNKNOWN_OPTION;
break;
}
failf(data, "Syntax error in telnet option: %s", head->data);
result = CURLE_TELNET_OPTION_SYNTAX;
break;
}
if(result) {
curl_slist_free_all(tn->telnet_vars);
tn->telnet_vars = NULL;
}
return result;
}
/*
* 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 Curl_easy *data = conn->data;
struct TELNET *tn = (struct TELNET *)data->req.protop;
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) {
if(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;
}
/*
* sendsuboption()
*
* Send suboption information to the server side.