[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * telnet implementation for busybox
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| 4 | *
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| 5 | * Author: Tomi Ollila <too@iki.fi>
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| 6 | * Copyright (C) 1994-2000 by Tomi Ollila
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| 7 | *
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| 8 | * Created: Thu Apr 7 13:29:41 1994 too
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| 9 | * Last modified: Fri Jun 9 14:34:24 2000 too
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| 10 | *
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| 11 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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| 12 | *
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| 13 | * HISTORY
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| 14 | * Revision 3.1 1994/04/17 11:31:54 too
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| 15 | * initial revision
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| 16 | * Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen <andersen@codepoet.org>
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| 17 | * Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan
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| 18 | * <jam@ltsp.org>
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| 19 | * Modified 2004/02/11 to add ability to pass the USER variable to remote host
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| 20 | * by Fernando Silveira <swrh@gmx.net>
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| 21 | *
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| 22 | */
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| 23 |
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| 24 | #include <termios.h>
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| 25 | #include <unistd.h>
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| 26 | #include <errno.h>
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| 27 | #include <stdlib.h>
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| 28 | #include <stdarg.h>
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| 29 | #include <string.h>
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| 30 | #include <signal.h>
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| 31 | #include <arpa/telnet.h>
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| 32 | #include <sys/types.h>
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| 33 | #include <sys/socket.h>
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| 34 | #include <netinet/in.h>
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| 35 | #include "busybox.h"
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| 36 |
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| 37 | #if 0
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| 38 | enum { DOTRACE = 1 };
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| 39 | #endif
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| 40 |
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| 41 | #ifdef DOTRACE
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| 42 | #include <arpa/inet.h> /* for inet_ntoa()... */
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| 43 | #define TRACE(x, y) do { if (x) printf y; } while (0)
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| 44 | #else
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| 45 | #define TRACE(x, y)
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| 46 | #endif
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| 47 |
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| 48 | #define DATABUFSIZE 128
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| 49 | #define IACBUFSIZE 128
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| 50 |
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| 51 | enum {
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| 52 | CHM_TRY = 0,
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| 53 | CHM_ON = 1,
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| 54 | CHM_OFF = 2,
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| 55 |
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| 56 | UF_ECHO = 0x01,
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| 57 | UF_SGA = 0x02,
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| 58 |
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| 59 | TS_0 = 1,
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| 60 | TS_IAC = 2,
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| 61 | TS_OPT = 3,
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| 62 | TS_SUB1 = 4,
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| 63 | TS_SUB2 = 5,
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| 64 | };
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| 65 |
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| 66 | #define WriteCS(fd, str) write(fd, str, sizeof str -1)
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| 67 |
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| 68 | typedef unsigned char byte;
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| 69 |
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| 70 | /* use globals to reduce size ??? */ /* test this hypothesis later */
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| 71 | static struct Globalvars {
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| 72 | int netfd; /* console fd:s are 0 and 1 (and 2) */
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| 73 | /* same buffer used both for network and console read/write */
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| 74 | char buf[DATABUFSIZE]; /* allocating so static size is smaller */
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| 75 | byte telstate; /* telnet negotiation state from network input */
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| 76 | byte telwish; /* DO, DONT, WILL, WONT */
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| 77 | byte charmode;
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| 78 | byte telflags;
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| 79 | byte gotsig;
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| 80 | byte do_termios;
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| 81 | /* buffer to handle telnet negotiations */
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| 82 | char iacbuf[IACBUFSIZE];
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| 83 | short iaclen; /* could even use byte */
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| 84 | struct termios termios_def;
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| 85 | struct termios termios_raw;
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| 86 | } G;
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| 87 |
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| 88 | #define xUSE_GLOBALVAR_PTR /* xUSE... -> don't use :D (makes smaller code) */
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| 89 |
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| 90 | #ifdef USE_GLOBALVAR_PTR
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| 91 | struct Globalvars * Gptr;
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| 92 | #define G (*Gptr)
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| 93 | #endif
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| 94 |
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| 95 | static inline void iacflush(void)
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| 96 | {
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| 97 | write(G.netfd, G.iacbuf, G.iaclen);
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| 98 | G.iaclen = 0;
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| 99 | }
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| 100 |
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| 101 | /* Function prototypes */
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| 102 | static void rawmode(void);
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| 103 | static void cookmode(void);
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| 104 | static void do_linemode(void);
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| 105 | static void will_charmode(void);
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| 106 | static void telopt(byte c);
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| 107 | static int subneg(byte c);
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| 108 |
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| 109 | /* Some globals */
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| 110 | static int one = 1;
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| 111 |
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| 112 | #ifdef CONFIG_FEATURE_TELNET_TTYPE
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| 113 | static char *ttype;
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| 114 | #endif
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| 115 |
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| 116 | #ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
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| 117 | static const char *autologin;
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| 118 | #endif
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| 119 |
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| 120 | #ifdef CONFIG_FEATURE_AUTOWIDTH
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| 121 | static int win_width, win_height;
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| 122 | #endif
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| 123 |
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| 124 | static void doexit(int ev)
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| 125 | {
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| 126 | cookmode();
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| 127 | exit(ev);
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| 128 | }
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| 129 |
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| 130 | static void conescape(void)
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| 131 | {
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| 132 | char b;
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| 133 |
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| 134 | if (G.gotsig) /* came from line mode... go raw */
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| 135 | rawmode();
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| 136 |
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| 137 | WriteCS(1, "\r\nConsole escape. Commands are:\r\n\n"
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| 138 | " l go to line mode\r\n"
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| 139 | " c go to character mode\r\n"
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| 140 | " z suspend telnet\r\n"
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| 141 | " e exit telnet\r\n");
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| 142 |
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| 143 | if (read(0, &b, 1) <= 0)
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| 144 | doexit(1);
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| 145 |
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| 146 | switch (b)
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| 147 | {
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| 148 | case 'l':
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| 149 | if (!G.gotsig)
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| 150 | {
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| 151 | do_linemode();
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| 152 | goto rrturn;
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| 153 | }
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| 154 | break;
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| 155 | case 'c':
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| 156 | if (G.gotsig)
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| 157 | {
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| 158 | will_charmode();
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| 159 | goto rrturn;
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| 160 | }
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| 161 | break;
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| 162 | case 'z':
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| 163 | cookmode();
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| 164 | kill(0, SIGTSTP);
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| 165 | rawmode();
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| 166 | break;
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| 167 | case 'e':
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| 168 | doexit(0);
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| 169 | }
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| 170 |
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| 171 | WriteCS(1, "continuing...\r\n");
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| 172 |
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| 173 | if (G.gotsig)
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| 174 | cookmode();
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| 175 |
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| 176 | rrturn:
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| 177 | G.gotsig = 0;
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| 178 |
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| 179 | }
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| 180 | static void handlenetoutput(int len)
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| 181 | {
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| 182 | /* here we could do smart tricks how to handle 0xFF:s in output
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| 183 | * stream like writing twice every sequence of FF:s (thus doing
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| 184 | * many write()s. But I think interactive telnet application does
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| 185 | * not need to be 100% 8-bit clean, so changing every 0xff:s to
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| 186 | * 0x7f:s
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| 187 | *
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| 188 | * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
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| 189 | * I don't agree.
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| 190 | * first - I cannot use programs like sz/rz
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| 191 | * second - the 0x0D is sent as one character and if the next
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| 192 | * char is 0x0A then it's eaten by a server side.
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| 193 | * third - whay doy you have to make 'many write()s'?
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| 194 | * I don't understand.
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| 195 | * So I implemented it. It's realy useful for me. I hope that
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| 196 | * others people will find it interesting to.
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| 197 | */
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| 198 |
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| 199 | int i, j;
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| 200 | byte * p = (byte*)G.buf;
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| 201 | byte outbuf[4*DATABUFSIZE];
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| 202 |
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| 203 | for (i = len, j = 0; i > 0; i--, p++)
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| 204 | {
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| 205 | if (*p == 0x1d)
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| 206 | {
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| 207 | conescape();
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| 208 | return;
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| 209 | }
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| 210 | outbuf[j++] = *p;
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| 211 | if (*p == 0xff)
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| 212 | outbuf[j++] = 0xff;
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| 213 | else if (*p == 0x0d)
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| 214 | outbuf[j++] = 0x00;
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| 215 | }
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| 216 | if (j > 0 )
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| 217 | write(G.netfd, outbuf, j);
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| 218 | }
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| 219 |
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| 220 |
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| 221 | static void handlenetinput(int len)
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| 222 | {
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| 223 | int i;
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| 224 | int cstart = 0;
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| 225 |
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| 226 | for (i = 0; i < len; i++)
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| 227 | {
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| 228 | byte c = G.buf[i];
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| 229 |
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| 230 | if (G.telstate == 0) /* most of the time state == 0 */
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| 231 | {
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| 232 | if (c == IAC)
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| 233 | {
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| 234 | cstart = i;
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| 235 | G.telstate = TS_IAC;
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| 236 | }
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| 237 | }
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| 238 | else
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| 239 | switch (G.telstate)
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| 240 | {
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| 241 | case TS_0:
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| 242 | if (c == IAC)
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| 243 | G.telstate = TS_IAC;
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| 244 | else
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| 245 | G.buf[cstart++] = c;
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| 246 | break;
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| 247 |
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| 248 | case TS_IAC:
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| 249 | if (c == IAC) /* IAC IAC -> 0xFF */
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| 250 | {
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| 251 | G.buf[cstart++] = c;
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| 252 | G.telstate = TS_0;
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| 253 | break;
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| 254 | }
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| 255 | /* else */
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| 256 | switch (c)
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| 257 | {
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| 258 | case SB:
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| 259 | G.telstate = TS_SUB1;
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| 260 | break;
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| 261 | case DO:
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| 262 | case DONT:
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| 263 | case WILL:
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| 264 | case WONT:
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| 265 | G.telwish = c;
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| 266 | G.telstate = TS_OPT;
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| 267 | break;
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| 268 | default:
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| 269 | G.telstate = TS_0; /* DATA MARK must be added later */
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| 270 | }
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| 271 | break;
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| 272 | case TS_OPT: /* WILL, WONT, DO, DONT */
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| 273 | telopt(c);
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| 274 | G.telstate = TS_0;
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| 275 | break;
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| 276 | case TS_SUB1: /* Subnegotiation */
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| 277 | case TS_SUB2: /* Subnegotiation */
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| 278 | if (subneg(c))
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| 279 | G.telstate = TS_0;
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| 280 | break;
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| 281 | }
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| 282 | }
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| 283 | if (G.telstate)
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| 284 | {
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| 285 | if (G.iaclen) iacflush();
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| 286 | if (G.telstate == TS_0) G.telstate = 0;
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| 287 |
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| 288 | len = cstart;
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| 289 | }
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| 290 |
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| 291 | if (len)
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| 292 | write(1, G.buf, len);
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| 293 | }
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| 294 |
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| 295 |
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| 296 | /* ******************************* */
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| 297 |
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| 298 | static inline void putiac(int c)
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| 299 | {
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| 300 | G.iacbuf[G.iaclen++] = c;
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| 301 | }
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| 302 |
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| 303 |
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| 304 | static void putiac2(byte wwdd, byte c)
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| 305 | {
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| 306 | if (G.iaclen + 3 > IACBUFSIZE)
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| 307 | iacflush();
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| 308 |
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| 309 | putiac(IAC);
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| 310 | putiac(wwdd);
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| 311 | putiac(c);
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| 312 | }
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| 313 |
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| 314 | #if 0
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| 315 | static void putiac1(byte c)
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| 316 | {
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| 317 | if (G.iaclen + 2 > IACBUFSIZE)
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| 318 | iacflush();
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| 319 |
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| 320 | putiac(IAC);
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| 321 | putiac(c);
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| 322 | }
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| 323 | #endif
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| 324 |
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| 325 | #ifdef CONFIG_FEATURE_TELNET_TTYPE
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| 326 | static void putiac_subopt(byte c, char *str)
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| 327 | {
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| 328 | int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
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| 329 |
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| 330 | if (G.iaclen + len > IACBUFSIZE)
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| 331 | iacflush();
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| 332 |
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| 333 | putiac(IAC);
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| 334 | putiac(SB);
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| 335 | putiac(c);
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| 336 | putiac(0);
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| 337 |
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| 338 | while(*str)
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| 339 | putiac(*str++);
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| 340 |
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| 341 | putiac(IAC);
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| 342 | putiac(SE);
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| 343 | }
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| 344 | #endif
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| 345 |
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| 346 | #ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
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| 347 | static void putiac_subopt_autologin(void)
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| 348 | {
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| 349 | int len = strlen(autologin) + 6; // (2 + 1 + 1 + strlen + 2)
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| 350 | char *user = "USER";
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| 351 |
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| 352 | if (G.iaclen + len > IACBUFSIZE)
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| 353 | iacflush();
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| 354 |
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| 355 | putiac(IAC);
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| 356 | putiac(SB);
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| 357 | putiac(TELOPT_NEW_ENVIRON);
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| 358 | putiac(TELQUAL_IS);
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| 359 | putiac(NEW_ENV_VAR);
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| 360 |
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| 361 | while(*user)
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| 362 | putiac(*user++);
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| 363 |
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| 364 | putiac(NEW_ENV_VALUE);
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| 365 |
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| 366 | while(*autologin)
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| 367 | putiac(*autologin++);
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| 368 |
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| 369 | putiac(IAC);
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| 370 | putiac(SE);
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| 371 | }
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| 372 | #endif
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| 373 |
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| 374 | #ifdef CONFIG_FEATURE_AUTOWIDTH
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| 375 | static void putiac_naws(byte c, int x, int y)
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| 376 | {
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| 377 | if (G.iaclen + 9 > IACBUFSIZE)
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| 378 | iacflush();
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| 379 |
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| 380 | putiac(IAC);
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| 381 | putiac(SB);
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| 382 | putiac(c);
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| 383 |
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| 384 | putiac((x >> 8) & 0xff);
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| 385 | putiac(x & 0xff);
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| 386 | putiac((y >> 8) & 0xff);
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| 387 | putiac(y & 0xff);
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| 388 |
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| 389 | putiac(IAC);
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| 390 | putiac(SE);
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| 391 | }
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| 392 | #endif
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| 393 |
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| 394 | /* void putiacstring (subneg strings) */
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| 395 |
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| 396 | /* ******************************* */
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| 397 |
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| 398 | static char const escapecharis[] = "\r\nEscape character is ";
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| 399 |
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| 400 | static void setConMode(void)
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| 401 | {
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| 402 | if (G.telflags & UF_ECHO)
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| 403 | {
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| 404 | if (G.charmode == CHM_TRY) {
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| 405 | G.charmode = CHM_ON;
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| 406 | printf("\r\nEntering character mode%s'^]'.\r\n", escapecharis);
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| 407 | rawmode();
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| 408 | }
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| 409 | }
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| 410 | else
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| 411 | {
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| 412 | if (G.charmode != CHM_OFF) {
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| 413 | G.charmode = CHM_OFF;
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| 414 | printf("\r\nEntering line mode%s'^C'.\r\n", escapecharis);
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| 415 | cookmode();
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| 416 | }
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| 417 | }
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| 418 | }
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| 419 |
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| 420 | /* ******************************* */
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| 421 |
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| 422 | static void will_charmode(void)
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| 423 | {
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| 424 | G.charmode = CHM_TRY;
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| 425 | G.telflags |= (UF_ECHO | UF_SGA);
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| 426 | setConMode();
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| 427 |
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| 428 | putiac2(DO, TELOPT_ECHO);
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| 429 | putiac2(DO, TELOPT_SGA);
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| 430 | iacflush();
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| 431 | }
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| 432 |
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| 433 | static void do_linemode(void)
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| 434 | {
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| 435 | G.charmode = CHM_TRY;
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| 436 | G.telflags &= ~(UF_ECHO | UF_SGA);
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| 437 | setConMode();
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| 438 |
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| 439 | putiac2(DONT, TELOPT_ECHO);
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| 440 | putiac2(DONT, TELOPT_SGA);
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| 441 | iacflush();
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| 442 | }
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| 443 |
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| 444 | /* ******************************* */
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| 445 |
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| 446 | static inline void to_notsup(char c)
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| 447 | {
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| 448 | if (G.telwish == WILL) putiac2(DONT, c);
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| 449 | else if (G.telwish == DO) putiac2(WONT, c);
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| 450 | }
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| 451 |
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| 452 | static inline void to_echo(void)
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| 453 | {
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| 454 | /* if server requests ECHO, don't agree */
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| 455 | if (G.telwish == DO) { putiac2(WONT, TELOPT_ECHO); return; }
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| 456 | else if (G.telwish == DONT) return;
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| 457 |
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| 458 | if (G.telflags & UF_ECHO)
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| 459 | {
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| 460 | if (G.telwish == WILL)
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| 461 | return;
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| 462 | }
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| 463 | else
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| 464 | if (G.telwish == WONT)
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| 465 | return;
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| 466 |
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| 467 | if (G.charmode != CHM_OFF)
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| 468 | G.telflags ^= UF_ECHO;
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| 469 |
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| 470 | if (G.telflags & UF_ECHO)
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| 471 | putiac2(DO, TELOPT_ECHO);
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| 472 | else
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| 473 | putiac2(DONT, TELOPT_ECHO);
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| 474 |
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| 475 | setConMode();
|
---|
| 476 | WriteCS(1, "\r\n"); /* sudden modec */
|
---|
| 477 | }
|
---|
| 478 |
|
---|
| 479 | static inline void to_sga(void)
|
---|
| 480 | {
|
---|
| 481 | /* daemon always sends will/wont, client do/dont */
|
---|
| 482 |
|
---|
| 483 | if (G.telflags & UF_SGA)
|
---|
| 484 | {
|
---|
| 485 | if (G.telwish == WILL)
|
---|
| 486 | return;
|
---|
| 487 | }
|
---|
| 488 | else
|
---|
| 489 | if (G.telwish == WONT)
|
---|
| 490 | return;
|
---|
| 491 |
|
---|
| 492 | if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
|
---|
| 493 | putiac2(DO, TELOPT_SGA);
|
---|
| 494 | else
|
---|
| 495 | putiac2(DONT, TELOPT_SGA);
|
---|
| 496 |
|
---|
| 497 | return;
|
---|
| 498 | }
|
---|
| 499 |
|
---|
| 500 | #ifdef CONFIG_FEATURE_TELNET_TTYPE
|
---|
| 501 | static inline void to_ttype(void)
|
---|
| 502 | {
|
---|
| 503 | /* Tell server we will (or won't) do TTYPE */
|
---|
| 504 |
|
---|
| 505 | if(ttype)
|
---|
| 506 | putiac2(WILL, TELOPT_TTYPE);
|
---|
| 507 | else
|
---|
| 508 | putiac2(WONT, TELOPT_TTYPE);
|
---|
| 509 |
|
---|
| 510 | return;
|
---|
| 511 | }
|
---|
| 512 | #endif
|
---|
| 513 |
|
---|
| 514 | #ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
---|
| 515 | static inline void to_new_environ(void)
|
---|
| 516 | {
|
---|
| 517 | /* Tell server we will (or will not) do AUTOLOGIN */
|
---|
| 518 |
|
---|
| 519 | if (autologin)
|
---|
| 520 | putiac2(WILL, TELOPT_NEW_ENVIRON);
|
---|
| 521 | else
|
---|
| 522 | putiac2(WONT, TELOPT_NEW_ENVIRON);
|
---|
| 523 |
|
---|
| 524 | return;
|
---|
| 525 | }
|
---|
| 526 | #endif
|
---|
| 527 |
|
---|
| 528 | #ifdef CONFIG_FEATURE_AUTOWIDTH
|
---|
| 529 | static inline void to_naws(void)
|
---|
| 530 | {
|
---|
| 531 | /* Tell server we will do NAWS */
|
---|
| 532 | putiac2(WILL, TELOPT_NAWS);
|
---|
| 533 | return;
|
---|
| 534 | }
|
---|
| 535 | #endif
|
---|
| 536 |
|
---|
| 537 | static void telopt(byte c)
|
---|
| 538 | {
|
---|
| 539 | switch (c)
|
---|
| 540 | {
|
---|
| 541 | case TELOPT_ECHO: to_echo(); break;
|
---|
| 542 | case TELOPT_SGA: to_sga(); break;
|
---|
| 543 | #ifdef CONFIG_FEATURE_TELNET_TTYPE
|
---|
| 544 | case TELOPT_TTYPE: to_ttype();break;
|
---|
| 545 | #endif
|
---|
| 546 | #ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
---|
| 547 | case TELOPT_NEW_ENVIRON: to_new_environ(); break;
|
---|
| 548 | #endif
|
---|
| 549 | #ifdef CONFIG_FEATURE_AUTOWIDTH
|
---|
| 550 | case TELOPT_NAWS: to_naws();
|
---|
| 551 | putiac_naws(c, win_width, win_height);
|
---|
| 552 | break;
|
---|
| 553 | #endif
|
---|
| 554 | default: to_notsup(c);
|
---|
| 555 | break;
|
---|
| 556 | }
|
---|
| 557 | }
|
---|
| 558 |
|
---|
| 559 |
|
---|
| 560 | /* ******************************* */
|
---|
| 561 |
|
---|
| 562 | /* subnegotiation -- ignore all (except TTYPE,NAWS) */
|
---|
| 563 |
|
---|
| 564 | static int subneg(byte c)
|
---|
| 565 | {
|
---|
| 566 | switch (G.telstate)
|
---|
| 567 | {
|
---|
| 568 | case TS_SUB1:
|
---|
| 569 | if (c == IAC)
|
---|
| 570 | G.telstate = TS_SUB2;
|
---|
| 571 | #ifdef CONFIG_FEATURE_TELNET_TTYPE
|
---|
| 572 | else
|
---|
| 573 | if (c == TELOPT_TTYPE)
|
---|
| 574 | putiac_subopt(TELOPT_TTYPE,ttype);
|
---|
| 575 | #endif
|
---|
| 576 | #ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
---|
| 577 | else
|
---|
| 578 | if (c == TELOPT_NEW_ENVIRON)
|
---|
| 579 | putiac_subopt_autologin();
|
---|
| 580 | #endif
|
---|
| 581 | break;
|
---|
| 582 | case TS_SUB2:
|
---|
| 583 | if (c == SE)
|
---|
| 584 | return TRUE;
|
---|
| 585 | G.telstate = TS_SUB1;
|
---|
| 586 | /* break; */
|
---|
| 587 | }
|
---|
| 588 | return FALSE;
|
---|
| 589 | }
|
---|
| 590 |
|
---|
| 591 | /* ******************************* */
|
---|
| 592 |
|
---|
| 593 | static void fgotsig(int sig)
|
---|
| 594 | {
|
---|
| 595 | G.gotsig = sig;
|
---|
| 596 | }
|
---|
| 597 |
|
---|
| 598 |
|
---|
| 599 | static void rawmode(void)
|
---|
| 600 | {
|
---|
| 601 | if (G.do_termios) tcsetattr(0, TCSADRAIN, &G.termios_raw);
|
---|
| 602 | }
|
---|
| 603 |
|
---|
| 604 | static void cookmode(void)
|
---|
| 605 | {
|
---|
| 606 | if (G.do_termios) tcsetattr(0, TCSADRAIN, &G.termios_def);
|
---|
| 607 | }
|
---|
| 608 |
|
---|
| 609 | int telnet_main(int argc, char** argv)
|
---|
| 610 | {
|
---|
| 611 | int len;
|
---|
| 612 | struct sockaddr_in s_in;
|
---|
| 613 | #ifdef USE_POLL
|
---|
| 614 | struct pollfd ufds[2];
|
---|
| 615 | #else
|
---|
| 616 | fd_set readfds;
|
---|
| 617 | int maxfd;
|
---|
| 618 | #endif
|
---|
| 619 |
|
---|
| 620 | #ifdef CONFIG_FEATURE_AUTOWIDTH
|
---|
| 621 | get_terminal_width_height(0, &win_width, &win_height);
|
---|
| 622 | #endif
|
---|
| 623 |
|
---|
| 624 | #ifdef CONFIG_FEATURE_TELNET_TTYPE
|
---|
| 625 | ttype = getenv("TERM");
|
---|
| 626 | #endif
|
---|
| 627 |
|
---|
| 628 | memset(&G, 0, sizeof G);
|
---|
| 629 |
|
---|
| 630 | if (tcgetattr(0, &G.termios_def) >= 0) {
|
---|
| 631 | G.do_termios = 1;
|
---|
| 632 |
|
---|
| 633 | G.termios_raw = G.termios_def;
|
---|
| 634 | cfmakeraw(&G.termios_raw);
|
---|
| 635 | }
|
---|
| 636 |
|
---|
| 637 | if (argc < 2)
|
---|
| 638 | bb_show_usage();
|
---|
| 639 |
|
---|
| 640 | #ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
---|
| 641 | if (1 & bb_getopt_ulflags(argc, argv, "al:", &autologin))
|
---|
| 642 | autologin = getenv("USER");
|
---|
| 643 |
|
---|
| 644 | if (optind < argc) {
|
---|
| 645 | bb_lookup_host(&s_in, argv[optind++]);
|
---|
| 646 | s_in.sin_port = bb_lookup_port((optind < argc) ? argv[optind++] :
|
---|
| 647 | "telnet", "tcp", 23);
|
---|
| 648 | if (optind < argc)
|
---|
| 649 | bb_show_usage();
|
---|
| 650 | } else
|
---|
| 651 | bb_show_usage();
|
---|
| 652 | #else
|
---|
| 653 | bb_lookup_host(&s_in, argv[1]);
|
---|
| 654 | s_in.sin_port = bb_lookup_port((argc == 3) ? argv[2] : "telnet", "tcp", 23);
|
---|
| 655 | #endif
|
---|
| 656 |
|
---|
| 657 | G.netfd = xconnect(&s_in);
|
---|
| 658 |
|
---|
| 659 | setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one);
|
---|
| 660 |
|
---|
| 661 | signal(SIGINT, fgotsig);
|
---|
| 662 |
|
---|
| 663 | #ifdef USE_POLL
|
---|
| 664 | ufds[0].fd = 0; ufds[1].fd = G.netfd;
|
---|
| 665 | ufds[0].events = ufds[1].events = POLLIN;
|
---|
| 666 | #else
|
---|
| 667 | FD_ZERO(&readfds);
|
---|
| 668 | FD_SET(0, &readfds);
|
---|
| 669 | FD_SET(G.netfd, &readfds);
|
---|
| 670 | maxfd = G.netfd + 1;
|
---|
| 671 | #endif
|
---|
| 672 |
|
---|
| 673 | while (1)
|
---|
| 674 | {
|
---|
| 675 | #ifndef USE_POLL
|
---|
| 676 | fd_set rfds = readfds;
|
---|
| 677 |
|
---|
| 678 | switch (select(maxfd, &rfds, NULL, NULL, NULL))
|
---|
| 679 | #else
|
---|
| 680 | switch (poll(ufds, 2, -1))
|
---|
| 681 | #endif
|
---|
| 682 | {
|
---|
| 683 | case 0:
|
---|
| 684 | /* timeout */
|
---|
| 685 | case -1:
|
---|
| 686 | /* error, ignore and/or log something, bay go to loop */
|
---|
| 687 | if (G.gotsig)
|
---|
| 688 | conescape();
|
---|
| 689 | else
|
---|
| 690 | sleep(1);
|
---|
| 691 | break;
|
---|
| 692 | default:
|
---|
| 693 |
|
---|
| 694 | #ifdef USE_POLL
|
---|
| 695 | if (ufds[0].revents) /* well, should check POLLIN, but ... */
|
---|
| 696 | #else
|
---|
| 697 | if (FD_ISSET(0, &rfds))
|
---|
| 698 | #endif
|
---|
| 699 | {
|
---|
| 700 | len = read(0, G.buf, DATABUFSIZE);
|
---|
| 701 |
|
---|
| 702 | if (len <= 0)
|
---|
| 703 | doexit(0);
|
---|
| 704 |
|
---|
| 705 | TRACE(0, ("Read con: %d\n", len));
|
---|
| 706 |
|
---|
| 707 | handlenetoutput(len);
|
---|
| 708 | }
|
---|
| 709 |
|
---|
| 710 | #ifdef USE_POLL
|
---|
| 711 | if (ufds[1].revents) /* well, should check POLLIN, but ... */
|
---|
| 712 | #else
|
---|
| 713 | if (FD_ISSET(G.netfd, &rfds))
|
---|
| 714 | #endif
|
---|
| 715 | {
|
---|
| 716 | len = read(G.netfd, G.buf, DATABUFSIZE);
|
---|
| 717 |
|
---|
| 718 | if (len <= 0)
|
---|
| 719 | {
|
---|
| 720 | WriteCS(1, "Connection closed by foreign host.\r\n");
|
---|
| 721 | doexit(1);
|
---|
| 722 | }
|
---|
| 723 | TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
|
---|
| 724 |
|
---|
| 725 | handlenetinput(len);
|
---|
| 726 | }
|
---|
| 727 | }
|
---|
| 728 | }
|
---|
| 729 | }
|
---|