* Created: Thu Apr 7 13:29:41 1994 too
* Last modified: Fri Jun 9 14:34:24 2000 too
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* HISTORY
* Revision 3.1 1994/04/17 11:31:54 too
* Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen <andersen@codepoet.org>
* Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan
* <jam@ltsp.org>
+ * Modified 2004/02/11 to add ability to pass the USER variable to remote host
+ * by Fernando Silveira <swrh@gmx.net>
*
*/
-#include <termios.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <signal.h>
-#include <arpa/telnet.h>
-#include <sys/types.h>
-#include <sys/socket.h>
#include <netinet/in.h>
-#include "busybox.h"
-
-#if 0
-static const int DOTRACE = 1;
+#include "libbb.h"
+#ifdef __BIONIC__
+/* should be in arpa/telnet.h */
+#define IAC 255 /* interpret as command: */
+#define DONT 254 /* you are not to use option */
+#define DO 253 /* please, you use option */
+#define WONT 252 /* I won't use option */
+#define WILL 251 /* I will use option */
+#define SB 250 /* interpret as subnegotiation */
+#define SE 240 /* end sub negotiation */
+#define TELOPT_ECHO 1 /* echo */
+#define TELOPT_SGA 3 /* suppress go ahead */
+#define TELOPT_TTYPE 24 /* terminal type */
+#define TELOPT_NAWS 31 /* window size */
+#else
+#include <arpa/telnet.h>
#endif
#ifdef DOTRACE
-#include <arpa/inet.h> /* for inet_ntoa()... */
#define TRACE(x, y) do { if (x) printf y; } while (0)
#else
-#define TRACE(x, y)
-#endif
-
-#if 0
-#define USE_POLL
-#include <sys/poll.h>
-#else
-#include <sys/time.h>
+#define TRACE(x, y)
#endif
-#define DATABUFSIZE 128
-#define IACBUFSIZE 128
+enum {
+ DATABUFSIZE = 128,
+ IACBUFSIZE = 128,
-static const int CHM_TRY = 0;
-static const int CHM_ON = 1;
-static const int CHM_OFF = 2;
+ CHM_TRY = 0,
+ CHM_ON = 1,
+ CHM_OFF = 2,
-static const int UF_ECHO = 0x01;
-static const int UF_SGA = 0x02;
+ UF_ECHO = 0x01,
+ UF_SGA = 0x02,
-enum {
TS_0 = 1,
TS_IAC = 2,
TS_OPT = 3,
TS_SUB2 = 5,
};
-#define WriteCS(fd, str) write(fd, str, sizeof str -1)
-
typedef unsigned char byte;
-/* use globals to reduce size ??? */ /* test this hypothesis later */
-static struct Globalvars {
- int netfd; /* console fd:s are 0 and 1 (and 2) */
- /* same buffer used both for network and console read/write */
- char buf[DATABUFSIZE]; /* allocating so static size is smaller */
+enum { netfd = 3 };
+
+struct globals {
+ int iaclen; /* could even use byte, but it's a loss on x86 */
byte telstate; /* telnet negotiation state from network input */
byte telwish; /* DO, DONT, WILL, WONT */
byte charmode;
byte telflags;
- byte gotsig;
+ byte do_termios;
+#if ENABLE_FEATURE_TELNET_TTYPE
+ char *ttype;
+#endif
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+ const char *autologin;
+#endif
+#if ENABLE_FEATURE_AUTOWIDTH
+ unsigned win_width, win_height;
+#endif
+ /* same buffer used both for network and console read/write */
+ char buf[DATABUFSIZE];
/* buffer to handle telnet negotiations */
char iacbuf[IACBUFSIZE];
- short iaclen; /* could even use byte */
- struct termios termios_def;
- struct termios termios_raw;
-} G;
-
-#define xUSE_GLOBALVAR_PTR /* xUSE... -> don't use :D (makes smaller code) */
-
-#ifdef USE_GLOBALVAR_PTR
-struct Globalvars * Gptr;
-#define G (*Gptr)
-#endif
-
-static inline void iacflush(void)
-{
- write(G.netfd, G.iacbuf, G.iaclen);
- G.iaclen = 0;
-}
+ struct termios termios_def;
+ struct termios termios_raw;
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { \
+ struct G_sizecheck { \
+ char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
+ }; \
+} while (0)
/* Function prototypes */
static void rawmode(void);
static void telopt(byte c);
static int subneg(byte c);
-/* Some globals */
-static int one = 1;
-
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
-static char *ttype;
-#endif
+static void iac_flush(void)
+{
+ write(netfd, G.iacbuf, G.iaclen);
+ G.iaclen = 0;
+}
-#ifdef CONFIG_FEATURE_AUTOWIDTH
-static int win_width, win_height;
-#endif
+#define write_str(fd, str) write(fd, str, sizeof(str) - 1)
+static void doexit(int ev) NORETURN;
static void doexit(int ev)
{
cookmode();
exit(ev);
-}
+}
-static void conescape(void)
+static void con_escape(void)
{
char b;
- if (G.gotsig) /* came from line mode... go raw */
+ if (bb_got_signal) /* came from line mode... go raw */
rawmode();
- WriteCS(1, "\r\nConsole escape. Commands are:\r\n\n"
+ write_str(1, "\r\nConsole escape. Commands are:\r\n\n"
" l go to line mode\r\n"
" c go to character mode\r\n"
" z suspend telnet\r\n"
" e exit telnet\r\n");
- if (read(0, &b, 1) <= 0)
- doexit(1);
+ if (read(STDIN_FILENO, &b, 1) <= 0)
+ doexit(EXIT_FAILURE);
- switch (b)
- {
+ switch (b) {
case 'l':
- if (!G.gotsig)
- {
+ if (!bb_got_signal) {
do_linemode();
- goto rrturn;
+ goto ret;
}
break;
case 'c':
- if (G.gotsig)
- {
+ if (bb_got_signal) {
will_charmode();
- goto rrturn;
+ goto ret;
}
break;
case 'z':
rawmode();
break;
case 'e':
- doexit(0);
+ doexit(EXIT_SUCCESS);
}
- WriteCS(1, "continuing...\r\n");
+ write_str(1, "continuing...\r\n");
- if (G.gotsig)
+ if (bb_got_signal)
cookmode();
-
- rrturn:
- G.gotsig = 0;
-
+ ret:
+ bb_got_signal = 0;
+
}
-static void handlenetoutput(int len)
+
+static void handle_net_output(int len)
{
- /* here we could do smart tricks how to handle 0xFF:s in output
- * stream like writing twice every sequence of FF:s (thus doing
- * many write()s. But I think interactive telnet application does
- * not need to be 100% 8-bit clean, so changing every 0xff:s to
- * 0x7f:s
+ /* here we could do smart tricks how to handle 0xFF:s in output
+ * stream like writing twice every sequence of FF:s (thus doing
+ * many write()s. But I think interactive telnet application does
+ * not need to be 100% 8-bit clean, so changing every 0xff:s to
+ * 0x7f:s
*
- * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
- * I don't agree.
- * first - I cannot use programs like sz/rz
- * second - the 0x0D is sent as one character and if the next
- * char is 0x0A then it's eaten by a server side.
- * third - whay doy you have to make 'many write()s'?
- * I don't understand.
- * So I implemented it. It's realy useful for me. I hope that
- * others people will find it interesting to.
+ * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
+ * I don't agree.
+ * first - I cannot use programs like sz/rz
+ * second - the 0x0D is sent as one character and if the next
+ * char is 0x0A then it's eaten by a server side.
+ * third - why do you have to make 'many write()s'?
+ * I don't understand.
+ * So I implemented it. It's really useful for me. I hope that
+ * other people will find it interesting too.
*/
int i, j;
- byte * p = G.buf;
+ byte *p = (byte*)G.buf;
byte outbuf[4*DATABUFSIZE];
- for (i = len, j = 0; i > 0; i--, p++)
- {
- if (*p == 0x1d)
- {
- conescape();
+ for (i = len, j = 0; i > 0; i--, p++) {
+ if (*p == 0x1d) {
+ con_escape();
return;
}
outbuf[j++] = *p;
if (*p == 0xff)
- outbuf[j++] = 0xff;
+ outbuf[j++] = 0xff;
else if (*p == 0x0d)
- outbuf[j++] = 0x00;
+ outbuf[j++] = 0x00;
}
- if (j > 0 )
- write(G.netfd, outbuf, j);
+ if (j > 0)
+ write(netfd, outbuf, j);
}
-
-static void handlenetinput(int len)
+static void handle_net_input(int len)
{
int i;
int cstart = 0;
- for (i = 0; i < len; i++)
- {
+ for (i = 0; i < len; i++) {
byte c = G.buf[i];
- if (G.telstate == 0) /* most of the time state == 0 */
- {
- if (c == IAC)
- {
+ if (G.telstate == 0) { /* most of the time state == 0 */
+ if (c == IAC) {
cstart = i;
G.telstate = TS_IAC;
}
+ continue;
}
- else
- switch (G.telstate)
- {
- case TS_0:
- if (c == IAC)
- G.telstate = TS_IAC;
- else
- G.buf[cstart++] = c;
- break;
-
- case TS_IAC:
- if (c == IAC) /* IAC IAC -> 0xFF */
- {
- G.buf[cstart++] = c;
- G.telstate = TS_0;
- break;
- }
- /* else */
- switch (c)
- {
- case SB:
- G.telstate = TS_SUB1;
- break;
- case DO:
- case DONT:
- case WILL:
- case WONT:
- G.telwish = c;
- G.telstate = TS_OPT;
- break;
- default:
- G.telstate = TS_0; /* DATA MARK must be added later */
- }
- break;
- case TS_OPT: /* WILL, WONT, DO, DONT */
- telopt(c);
- G.telstate = TS_0;
- break;
- case TS_SUB1: /* Subnegotiation */
- case TS_SUB2: /* Subnegotiation */
- if (subneg(c))
- G.telstate = TS_0;
- break;
- }
- }
- if (G.telstate)
- {
- if (G.iaclen) iacflush();
- if (G.telstate == TS_0) G.telstate = 0;
+ switch (G.telstate) {
+ case TS_0:
+ if (c == IAC)
+ G.telstate = TS_IAC;
+ else
+ G.buf[cstart++] = c;
+ break;
+ case TS_IAC:
+ if (c == IAC) { /* IAC IAC -> 0xFF */
+ G.buf[cstart++] = c;
+ G.telstate = TS_0;
+ break;
+ }
+ /* else */
+ switch (c) {
+ case SB:
+ G.telstate = TS_SUB1;
+ break;
+ case DO:
+ case DONT:
+ case WILL:
+ case WONT:
+ G.telwish = c;
+ G.telstate = TS_OPT;
+ break;
+ default:
+ G.telstate = TS_0; /* DATA MARK must be added later */
+ }
+ break;
+ case TS_OPT: /* WILL, WONT, DO, DONT */
+ telopt(c);
+ G.telstate = TS_0;
+ break;
+ case TS_SUB1: /* Subnegotiation */
+ case TS_SUB2: /* Subnegotiation */
+ if (subneg(c))
+ G.telstate = TS_0;
+ break;
+ }
+ }
+ if (G.telstate) {
+ if (G.iaclen)
+ iac_flush();
+ if (G.telstate == TS_0)
+ G.telstate = 0;
len = cstart;
}
if (len)
- write(1, G.buf, len);
+ write(STDOUT_FILENO, G.buf, len);
}
-
-/* ******************************* */
-
-static inline void putiac(int c)
+static void put_iac(int c)
{
G.iacbuf[G.iaclen++] = c;
}
-
-static void putiac2(byte wwdd, byte c)
+static void put_iac2(byte wwdd, byte c)
{
if (G.iaclen + 3 > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(wwdd);
- putiac(c);
+ put_iac(IAC);
+ put_iac(wwdd);
+ put_iac(c);
}
-#if 0
-static void putiac1(byte c)
+#if ENABLE_FEATURE_TELNET_TTYPE
+static void put_iac_subopt(byte c, char *str)
{
- if (G.iaclen + 2 > IACBUFSIZE)
- iacflush();
+ int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
- putiac(IAC);
- putiac(c);
+ if (G.iaclen + len > IACBUFSIZE)
+ iac_flush();
+
+ put_iac(IAC);
+ put_iac(SB);
+ put_iac(c);
+ put_iac(0);
+
+ while (*str)
+ put_iac(*str++);
+
+ put_iac(IAC);
+ put_iac(SE);
}
#endif
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
-static void putiac_subopt(byte c, char *str)
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+static void put_iac_subopt_autologin(void)
{
- int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
+ int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
+ const char *user = "USER";
if (G.iaclen + len > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(SB);
- putiac(c);
- putiac(0);
+ put_iac(IAC);
+ put_iac(SB);
+ put_iac(TELOPT_NEW_ENVIRON);
+ put_iac(TELQUAL_IS);
+ put_iac(NEW_ENV_VAR);
- while(*str)
- putiac(*str++);
+ while (*user)
+ put_iac(*user++);
- putiac(IAC);
- putiac(SE);
+ put_iac(NEW_ENV_VALUE);
+
+ while (*G.autologin)
+ put_iac(*G.autologin++);
+
+ put_iac(IAC);
+ put_iac(SE);
}
#endif
-#ifdef CONFIG_FEATURE_AUTOWIDTH
-static void putiac_naws(byte c, int x, int y)
+#if ENABLE_FEATURE_AUTOWIDTH
+static void put_iac_naws(byte c, int x, int y)
{
if (G.iaclen + 9 > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(SB);
- putiac(c);
+ put_iac(IAC);
+ put_iac(SB);
+ put_iac(c);
- putiac((x >> 8) & 0xff);
- putiac(x & 0xff);
- putiac((y >> 8) & 0xff);
- putiac(y & 0xff);
+ put_iac((x >> 8) & 0xff);
+ put_iac(x & 0xff);
+ put_iac((y >> 8) & 0xff);
+ put_iac(y & 0xff);
- putiac(IAC);
- putiac(SE);
+ put_iac(IAC);
+ put_iac(SE);
}
#endif
-/* void putiacstring (subneg strings) */
-
-/* ******************************* */
-
-static char const escapecharis[] = "\r\nEscape character is ";
+static char const escapecharis[] ALIGN1 = "\r\nEscape character is ";
static void setConMode(void)
{
- if (G.telflags & UF_ECHO)
- {
+ if (G.telflags & UF_ECHO) {
if (G.charmode == CHM_TRY) {
G.charmode = CHM_ON;
printf("\r\nEntering character mode%s'^]'.\r\n", escapecharis);
rawmode();
}
- }
- else
- {
+ } else {
if (G.charmode != CHM_OFF) {
G.charmode = CHM_OFF;
printf("\r\nEntering line mode%s'^C'.\r\n", escapecharis);
}
}
-/* ******************************* */
-
static void will_charmode(void)
{
G.charmode = CHM_TRY;
G.telflags |= (UF_ECHO | UF_SGA);
setConMode();
-
- putiac2(DO, TELOPT_ECHO);
- putiac2(DO, TELOPT_SGA);
- iacflush();
+
+ put_iac2(DO, TELOPT_ECHO);
+ put_iac2(DO, TELOPT_SGA);
+ iac_flush();
}
static void do_linemode(void)
G.telflags &= ~(UF_ECHO | UF_SGA);
setConMode();
- putiac2(DONT, TELOPT_ECHO);
- putiac2(DONT, TELOPT_SGA);
- iacflush();
+ put_iac2(DONT, TELOPT_ECHO);
+ put_iac2(DONT, TELOPT_SGA);
+ iac_flush();
}
-/* ******************************* */
-
-static inline void to_notsup(char c)
+static void to_notsup(char c)
{
- if (G.telwish == WILL) putiac2(DONT, c);
- else if (G.telwish == DO) putiac2(WONT, c);
+ if (G.telwish == WILL)
+ put_iac2(DONT, c);
+ else if (G.telwish == DO)
+ put_iac2(WONT, c);
}
-static inline void to_echo(void)
+static void to_echo(void)
{
/* if server requests ECHO, don't agree */
- if (G.telwish == DO) { putiac2(WONT, TELOPT_ECHO); return; }
- else if (G.telwish == DONT) return;
-
- if (G.telflags & UF_ECHO)
- {
- if (G.telwish == WILL)
- return;
+ if (G.telwish == DO) {
+ put_iac2(WONT, TELOPT_ECHO);
+ return;
}
- else
- if (G.telwish == WONT)
+ if (G.telwish == DONT)
+ return;
+
+ if (G.telflags & UF_ECHO) {
+ if (G.telwish == WILL)
return;
+ } else if (G.telwish == WONT)
+ return;
if (G.charmode != CHM_OFF)
G.telflags ^= UF_ECHO;
if (G.telflags & UF_ECHO)
- putiac2(DO, TELOPT_ECHO);
+ put_iac2(DO, TELOPT_ECHO);
else
- putiac2(DONT, TELOPT_ECHO);
+ put_iac2(DONT, TELOPT_ECHO);
setConMode();
- WriteCS(1, "\r\n"); /* sudden modec */
+ write_str(1, "\r\n"); /* sudden modec */
}
-static inline void to_sga(void)
+static void to_sga(void)
{
/* daemon always sends will/wont, client do/dont */
- if (G.telflags & UF_SGA)
- {
+ if (G.telflags & UF_SGA) {
if (G.telwish == WILL)
return;
- }
- else
- if (G.telwish == WONT)
- return;
-
- if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
- putiac2(DO, TELOPT_SGA);
- else
- putiac2(DONT, TELOPT_SGA);
+ } else if (G.telwish == WONT)
+ return;
- return;
+ G.telflags ^= UF_SGA; /* toggle */
+ if (G.telflags & UF_SGA)
+ put_iac2(DO, TELOPT_SGA);
+ else
+ put_iac2(DONT, TELOPT_SGA);
}
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
-static inline void to_ttype(void)
+#if ENABLE_FEATURE_TELNET_TTYPE
+static void to_ttype(void)
{
/* Tell server we will (or won't) do TTYPE */
- if(ttype)
- putiac2(WILL, TELOPT_TTYPE);
+ if (G.ttype)
+ put_iac2(WILL, TELOPT_TTYPE);
else
- putiac2(WONT, TELOPT_TTYPE);
+ put_iac2(WONT, TELOPT_TTYPE);
+}
+#endif
+
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+static void to_new_environ(void)
+{
+ /* Tell server we will (or will not) do AUTOLOGIN */
- return;
+ if (G.autologin)
+ put_iac2(WILL, TELOPT_NEW_ENVIRON);
+ else
+ put_iac2(WONT, TELOPT_NEW_ENVIRON);
}
#endif
-#ifdef CONFIG_FEATURE_AUTOWIDTH
-static inline void to_naws(void)
-{
+#if ENABLE_FEATURE_AUTOWIDTH
+static void to_naws(void)
+{
/* Tell server we will do NAWS */
- putiac2(WILL, TELOPT_NAWS);
- return;
-}
+ put_iac2(WILL, TELOPT_NAWS);
+}
#endif
static void telopt(byte c)
{
- switch (c)
- {
- case TELOPT_ECHO: to_echo(); break;
- case TELOPT_SGA: to_sga(); break;
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
- case TELOPT_TTYPE: to_ttype();break;
+ switch (c) {
+ case TELOPT_ECHO:
+ to_echo(); break;
+ case TELOPT_SGA:
+ to_sga(); break;
+#if ENABLE_FEATURE_TELNET_TTYPE
+ case TELOPT_TTYPE:
+ to_ttype(); break;
#endif
-#ifdef CONFIG_FEATURE_AUTOWIDTH
- case TELOPT_NAWS: to_naws();
- putiac_naws(c, win_width, win_height);
- break;
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+ case TELOPT_NEW_ENVIRON:
+ to_new_environ(); break;
+#endif
+#if ENABLE_FEATURE_AUTOWIDTH
+ case TELOPT_NAWS:
+ to_naws();
+ put_iac_naws(c, G.win_width, G.win_height);
+ break;
#endif
- default: to_notsup(c);
- break;
+ default:
+ to_notsup(c);
+ break;
}
}
-
-/* ******************************* */
-
/* subnegotiation -- ignore all (except TTYPE,NAWS) */
-
static int subneg(byte c)
{
- switch (G.telstate)
- {
+ switch (G.telstate) {
case TS_SUB1:
if (c == IAC)
G.telstate = TS_SUB2;
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
+#if ENABLE_FEATURE_TELNET_TTYPE
else
if (c == TELOPT_TTYPE)
- putiac_subopt(TELOPT_TTYPE,ttype);
+ put_iac_subopt(TELOPT_TTYPE, G.ttype);
+#endif
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+ else
+ if (c == TELOPT_NEW_ENVIRON)
+ put_iac_subopt_autologin();
#endif
break;
case TS_SUB2:
return FALSE;
}
-/* ******************************* */
-
-static void fgotsig(int sig)
-{
- G.gotsig = sig;
-}
-
-
static void rawmode(void)
{
- tcsetattr(0, TCSADRAIN, &G.termios_raw);
-}
+ if (G.do_termios)
+ tcsetattr(0, TCSADRAIN, &G.termios_raw);
+}
static void cookmode(void)
{
- tcsetattr(0, TCSADRAIN, &G.termios_def);
+ if (G.do_termios)
+ tcsetattr(0, TCSADRAIN, &G.termios_def);
}
-extern int telnet_main(int argc, char** argv)
+/* poll gives smaller (-70 bytes) code */
+#define USE_POLL 1
+
+int telnet_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int telnet_main(int argc UNUSED_PARAM, char **argv)
{
char *host;
- char *port;
+ int port;
int len;
- struct sockaddr_in s_in;
#ifdef USE_POLL
struct pollfd ufds[2];
-#else
+#else
fd_set readfds;
int maxfd;
-#endif
+#endif
+
+ INIT_G();
-#ifdef CONFIG_FEATURE_AUTOWIDTH
- get_terminal_width_height(0, &win_width, &win_height);
+#if ENABLE_FEATURE_AUTOWIDTH
+ get_terminal_width_height(0, &G.win_width, &G.win_height);
#endif
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
- ttype = getenv("TERM");
+#if ENABLE_FEATURE_TELNET_TTYPE
+ G.ttype = getenv("TERM");
#endif
- memset(&G, 0, sizeof G);
+ if (tcgetattr(0, &G.termios_def) >= 0) {
+ G.do_termios = 1;
+ G.termios_raw = G.termios_def;
+ cfmakeraw(&G.termios_raw);
+ }
+
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+ if (1 & getopt32(argv, "al:", &G.autologin))
+ G.autologin = getenv("USER");
+ argv += optind;
+#else
+ argv++;
+#endif
+ if (!*argv)
+ bb_show_usage();
+ host = *argv++;
+ port = bb_lookup_port(*argv ? *argv++ : "telnet", "tcp", 23);
+ if (*argv) /* extra params?? */
+ bb_show_usage();
- if (tcgetattr(0, &G.termios_def) < 0)
- exit(1);
-
- G.termios_raw = G.termios_def;
- cfmakeraw(&G.termios_raw);
-
- if (argc < 2) bb_show_usage();
- port = (argc > 2)? argv[2] : "23";
-
- host = argv[1];
-
- bb_lookup_host(&s_in, host, port);
- G.netfd = xconnect(&s_in);
+ xmove_fd(create_and_connect_stream_or_die(host, port), netfd);
- setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one);
+ setsockopt(netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
- signal(SIGINT, fgotsig);
+ signal(SIGINT, record_signo);
#ifdef USE_POLL
- ufds[0].fd = 0; ufds[1].fd = G.netfd;
+ ufds[0].fd = 0; ufds[1].fd = netfd;
ufds[0].events = ufds[1].events = POLLIN;
-#else
+#else
FD_ZERO(&readfds);
- FD_SET(0, &readfds);
- FD_SET(G.netfd, &readfds);
- maxfd = G.netfd + 1;
+ FD_SET(STDIN_FILENO, &readfds);
+ FD_SET(netfd, &readfds);
+ maxfd = netfd + 1;
#endif
-
- while (1)
- {
+
+ while (1) {
#ifndef USE_POLL
fd_set rfds = readfds;
-
+
switch (select(maxfd, &rfds, NULL, NULL, NULL))
#else
switch (poll(ufds, 2, -1))
-#endif
+#endif
{
case 0:
/* timeout */
case -1:
/* error, ignore and/or log something, bay go to loop */
- if (G.gotsig)
- conescape();
+ if (bb_got_signal)
+ con_escape();
else
sleep(1);
break;
default:
#ifdef USE_POLL
- if (ufds[0].revents) /* well, should check POLLIN, but ... */
-#else
- if (FD_ISSET(0, &rfds))
-#endif
+ if (ufds[0].revents)
+#else
+ if (FD_ISSET(STDIN_FILENO, &rfds))
+#endif
{
- len = read(0, G.buf, DATABUFSIZE);
-
+ len = safe_read(STDIN_FILENO, G.buf, DATABUFSIZE);
if (len <= 0)
- doexit(0);
-
+ doexit(EXIT_SUCCESS);
TRACE(0, ("Read con: %d\n", len));
-
- handlenetoutput(len);
+ handle_net_output(len);
}
#ifdef USE_POLL
- if (ufds[1].revents) /* well, should check POLLIN, but ... */
-#else
- if (FD_ISSET(G.netfd, &rfds))
-#endif
+ if (ufds[1].revents)
+#else
+ if (FD_ISSET(netfd, &rfds))
+#endif
{
- len = read(G.netfd, G.buf, DATABUFSIZE);
-
- if (len <= 0)
- {
- WriteCS(1, "Connection closed by foreign host.\r\n");
- doexit(1);
+ len = safe_read(netfd, G.buf, DATABUFSIZE);
+ if (len <= 0) {
+ write_str(1, "Connection closed by foreign host\r\n");
+ doexit(EXIT_FAILURE);
}
- TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
-
- handlenetinput(len);
+ TRACE(0, ("Read netfd (%d): %d\n", netfd, len));
+ handle_net_input(len);
}
}
- }
+ } /* while (1) */
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
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