[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 <arpa/telnet.h>
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| 26 | #include <netinet/in.h>
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[1770] | 27 | #include "libbb.h"
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[821] | 28 |
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| 29 | #ifdef DOTRACE
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| 30 | #define TRACE(x, y) do { if (x) printf y; } while (0)
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| 31 | #else
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| 32 | #define TRACE(x, y)
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| 33 | #endif
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| 34 |
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[1770] | 35 | enum {
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| 36 | DATABUFSIZE = 128,
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| 37 | IACBUFSIZE = 128,
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[821] | 38 |
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| 39 | CHM_TRY = 0,
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| 40 | CHM_ON = 1,
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| 41 | CHM_OFF = 2,
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| 42 |
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| 43 | UF_ECHO = 0x01,
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| 44 | UF_SGA = 0x02,
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| 45 |
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| 46 | TS_0 = 1,
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| 47 | TS_IAC = 2,
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| 48 | TS_OPT = 3,
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| 49 | TS_SUB1 = 4,
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| 50 | TS_SUB2 = 5,
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| 51 | };
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| 52 |
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| 53 | typedef unsigned char byte;
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| 54 |
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[1770] | 55 | struct globals {
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| 56 | int netfd; /* console fd:s are 0 and 1 (and 2) */
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| 57 | short iaclen; /* could even use byte */
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[821] | 58 | byte telstate; /* telnet negotiation state from network input */
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| 59 | byte telwish; /* DO, DONT, WILL, WONT */
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| 60 | byte charmode;
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| 61 | byte telflags;
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| 62 | byte gotsig;
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| 63 | byte do_termios;
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[1770] | 64 | #if ENABLE_FEATURE_TELNET_TTYPE
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| 65 | char *ttype;
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| 66 | #endif
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| 67 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
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| 68 | const char *autologin;
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| 69 | #endif
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| 70 | #if ENABLE_FEATURE_AUTOWIDTH
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| 71 | int win_width, win_height;
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| 72 | #endif
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| 73 | /* same buffer used both for network and console read/write */
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| 74 | char buf[DATABUFSIZE];
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[821] | 75 | /* buffer to handle telnet negotiations */
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| 76 | char iacbuf[IACBUFSIZE];
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| 77 | struct termios termios_def;
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| 78 | struct termios termios_raw;
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[1770] | 79 | };
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| 80 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 81 | void BUG_telnet_globals_too_big(void);
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| 82 | #define INIT_G() do { \
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| 83 | if (sizeof(G) > COMMON_BUFSIZE) \
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| 84 | BUG_telnet_globals_too_big(); \
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| 85 | /* memset(&G, 0, sizeof G); - already is */ \
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| 86 | } while (0)
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[821] | 87 |
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| 88 | /* Function prototypes */
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| 89 | static void rawmode(void);
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| 90 | static void cookmode(void);
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| 91 | static void do_linemode(void);
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| 92 | static void will_charmode(void);
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| 93 | static void telopt(byte c);
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| 94 | static int subneg(byte c);
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| 95 |
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[1770] | 96 | static void iacflush(void)
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| 97 | {
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| 98 | write(G.netfd, G.iacbuf, G.iaclen);
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| 99 | G.iaclen = 0;
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| 100 | }
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[821] | 101 |
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[1770] | 102 | #define write_str(fd, str) write(fd, str, sizeof(str) - 1)
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[821] | 103 |
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| 104 | static void doexit(int ev)
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| 105 | {
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| 106 | cookmode();
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| 107 | exit(ev);
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| 108 | }
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| 109 |
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| 110 | static void conescape(void)
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| 111 | {
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| 112 | char b;
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| 113 |
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| 114 | if (G.gotsig) /* came from line mode... go raw */
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| 115 | rawmode();
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| 116 |
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[1770] | 117 | write_str(1, "\r\nConsole escape. Commands are:\r\n\n"
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[821] | 118 | " l go to line mode\r\n"
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| 119 | " c go to character mode\r\n"
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| 120 | " z suspend telnet\r\n"
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| 121 | " e exit telnet\r\n");
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| 122 |
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| 123 | if (read(0, &b, 1) <= 0)
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| 124 | doexit(1);
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| 125 |
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[1770] | 126 | switch (b) {
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[821] | 127 | case 'l':
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[1770] | 128 | if (!G.gotsig) {
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[821] | 129 | do_linemode();
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| 130 | goto rrturn;
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| 131 | }
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| 132 | break;
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| 133 | case 'c':
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[1770] | 134 | if (G.gotsig) {
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[821] | 135 | will_charmode();
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| 136 | goto rrturn;
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| 137 | }
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| 138 | break;
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| 139 | case 'z':
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| 140 | cookmode();
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| 141 | kill(0, SIGTSTP);
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| 142 | rawmode();
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| 143 | break;
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| 144 | case 'e':
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| 145 | doexit(0);
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| 146 | }
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| 147 |
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[1770] | 148 | write_str(1, "continuing...\r\n");
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[821] | 149 |
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| 150 | if (G.gotsig)
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| 151 | cookmode();
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| 152 |
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| 153 | rrturn:
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| 154 | G.gotsig = 0;
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| 155 |
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| 156 | }
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[1770] | 157 |
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[821] | 158 | static void handlenetoutput(int len)
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| 159 | {
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| 160 | /* here we could do smart tricks how to handle 0xFF:s in output
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| 161 | * stream like writing twice every sequence of FF:s (thus doing
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| 162 | * many write()s. But I think interactive telnet application does
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| 163 | * not need to be 100% 8-bit clean, so changing every 0xff:s to
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| 164 | * 0x7f:s
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| 165 | *
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| 166 | * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
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| 167 | * I don't agree.
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| 168 | * first - I cannot use programs like sz/rz
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| 169 | * second - the 0x0D is sent as one character and if the next
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[1770] | 170 | * char is 0x0A then it's eaten by a server side.
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[821] | 171 | * third - whay doy you have to make 'many write()s'?
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[1770] | 172 | * I don't understand.
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[821] | 173 | * So I implemented it. It's realy useful for me. I hope that
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| 174 | * others people will find it interesting to.
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| 175 | */
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| 176 |
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| 177 | int i, j;
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| 178 | byte * p = (byte*)G.buf;
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| 179 | byte outbuf[4*DATABUFSIZE];
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| 180 |
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| 181 | for (i = len, j = 0; i > 0; i--, p++)
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| 182 | {
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| 183 | if (*p == 0x1d)
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| 184 | {
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| 185 | conescape();
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| 186 | return;
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| 187 | }
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| 188 | outbuf[j++] = *p;
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| 189 | if (*p == 0xff)
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[1770] | 190 | outbuf[j++] = 0xff;
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[821] | 191 | else if (*p == 0x0d)
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[1770] | 192 | outbuf[j++] = 0x00;
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[821] | 193 | }
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[1770] | 194 | if (j > 0)
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| 195 | write(G.netfd, outbuf, j);
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[821] | 196 | }
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| 197 |
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| 198 | static void handlenetinput(int len)
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| 199 | {
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| 200 | int i;
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| 201 | int cstart = 0;
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| 202 |
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| 203 | for (i = 0; i < len; i++)
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| 204 | {
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| 205 | byte c = G.buf[i];
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| 206 |
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| 207 | if (G.telstate == 0) /* most of the time state == 0 */
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| 208 | {
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| 209 | if (c == IAC)
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| 210 | {
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| 211 | cstart = i;
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| 212 | G.telstate = TS_IAC;
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| 213 | }
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| 214 | }
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| 215 | else
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| 216 | switch (G.telstate)
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| 217 | {
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| 218 | case TS_0:
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| 219 | if (c == IAC)
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| 220 | G.telstate = TS_IAC;
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| 221 | else
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| 222 | G.buf[cstart++] = c;
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| 223 | break;
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| 224 |
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| 225 | case TS_IAC:
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| 226 | if (c == IAC) /* IAC IAC -> 0xFF */
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| 227 | {
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| 228 | G.buf[cstart++] = c;
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| 229 | G.telstate = TS_0;
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| 230 | break;
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| 231 | }
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| 232 | /* else */
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| 233 | switch (c)
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| 234 | {
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| 235 | case SB:
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| 236 | G.telstate = TS_SUB1;
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| 237 | break;
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| 238 | case DO:
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| 239 | case DONT:
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| 240 | case WILL:
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| 241 | case WONT:
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| 242 | G.telwish = c;
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| 243 | G.telstate = TS_OPT;
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| 244 | break;
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| 245 | default:
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| 246 | G.telstate = TS_0; /* DATA MARK must be added later */
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| 247 | }
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| 248 | break;
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| 249 | case TS_OPT: /* WILL, WONT, DO, DONT */
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| 250 | telopt(c);
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| 251 | G.telstate = TS_0;
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| 252 | break;
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| 253 | case TS_SUB1: /* Subnegotiation */
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| 254 | case TS_SUB2: /* Subnegotiation */
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| 255 | if (subneg(c))
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| 256 | G.telstate = TS_0;
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| 257 | break;
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| 258 | }
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| 259 | }
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| 260 | if (G.telstate)
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| 261 | {
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| 262 | if (G.iaclen) iacflush();
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| 263 | if (G.telstate == TS_0) G.telstate = 0;
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| 264 |
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| 265 | len = cstart;
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| 266 | }
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| 267 |
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| 268 | if (len)
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| 269 | write(1, G.buf, len);
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| 270 | }
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| 271 |
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[1770] | 272 | static void putiac(int c)
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[821] | 273 | {
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| 274 | G.iacbuf[G.iaclen++] = c;
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| 275 | }
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| 276 |
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| 277 | static void putiac2(byte wwdd, byte c)
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| 278 | {
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| 279 | if (G.iaclen + 3 > IACBUFSIZE)
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| 280 | iacflush();
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| 281 |
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| 282 | putiac(IAC);
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| 283 | putiac(wwdd);
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| 284 | putiac(c);
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| 285 | }
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| 286 |
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[1770] | 287 | #if ENABLE_FEATURE_TELNET_TTYPE
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[821] | 288 | static void putiac_subopt(byte c, char *str)
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| 289 | {
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| 290 | int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
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| 291 |
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| 292 | if (G.iaclen + len > IACBUFSIZE)
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| 293 | iacflush();
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| 294 |
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| 295 | putiac(IAC);
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| 296 | putiac(SB);
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| 297 | putiac(c);
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| 298 | putiac(0);
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| 299 |
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[1770] | 300 | while (*str)
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[821] | 301 | putiac(*str++);
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| 302 |
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| 303 | putiac(IAC);
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| 304 | putiac(SE);
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| 305 | }
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| 306 | #endif
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| 307 |
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[1770] | 308 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
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[821] | 309 | static void putiac_subopt_autologin(void)
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| 310 | {
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[1770] | 311 | int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
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| 312 | const char *user = "USER";
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[821] | 313 |
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| 314 | if (G.iaclen + len > IACBUFSIZE)
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| 315 | iacflush();
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| 316 |
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| 317 | putiac(IAC);
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| 318 | putiac(SB);
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| 319 | putiac(TELOPT_NEW_ENVIRON);
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| 320 | putiac(TELQUAL_IS);
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| 321 | putiac(NEW_ENV_VAR);
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| 322 |
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[1770] | 323 | while (*user)
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[821] | 324 | putiac(*user++);
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| 325 |
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| 326 | putiac(NEW_ENV_VALUE);
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| 327 |
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[1770] | 328 | while (*G.autologin)
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| 329 | putiac(*G.autologin++);
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[821] | 330 |
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| 331 | putiac(IAC);
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| 332 | putiac(SE);
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| 333 | }
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| 334 | #endif
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| 335 |
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[1770] | 336 | #if ENABLE_FEATURE_AUTOWIDTH
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[821] | 337 | static void putiac_naws(byte c, int x, int y)
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| 338 | {
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| 339 | if (G.iaclen + 9 > IACBUFSIZE)
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| 340 | iacflush();
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| 341 |
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| 342 | putiac(IAC);
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| 343 | putiac(SB);
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| 344 | putiac(c);
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| 345 |
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| 346 | putiac((x >> 8) & 0xff);
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| 347 | putiac(x & 0xff);
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| 348 | putiac((y >> 8) & 0xff);
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| 349 | putiac(y & 0xff);
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| 350 |
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| 351 | putiac(IAC);
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| 352 | putiac(SE);
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| 353 | }
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| 354 | #endif
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| 355 |
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[1770] | 356 | static char const escapecharis[] ALIGN1 = "\r\nEscape character is ";
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[821] | 357 |
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| 358 | static void setConMode(void)
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| 359 | {
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[1770] | 360 | if (G.telflags & UF_ECHO) {
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[821] | 361 | if (G.charmode == CHM_TRY) {
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| 362 | G.charmode = CHM_ON;
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| 363 | printf("\r\nEntering character mode%s'^]'.\r\n", escapecharis);
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| 364 | rawmode();
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| 365 | }
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[1770] | 366 | } else {
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[821] | 367 | if (G.charmode != CHM_OFF) {
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| 368 | G.charmode = CHM_OFF;
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| 369 | printf("\r\nEntering line mode%s'^C'.\r\n", escapecharis);
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| 370 | cookmode();
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| 371 | }
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| 372 | }
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| 373 | }
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| 374 |
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| 375 | static void will_charmode(void)
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| 376 | {
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| 377 | G.charmode = CHM_TRY;
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| 378 | G.telflags |= (UF_ECHO | UF_SGA);
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| 379 | setConMode();
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| 380 |
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| 381 | putiac2(DO, TELOPT_ECHO);
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| 382 | putiac2(DO, TELOPT_SGA);
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| 383 | iacflush();
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| 384 | }
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| 385 |
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| 386 | static void do_linemode(void)
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| 387 | {
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| 388 | G.charmode = CHM_TRY;
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| 389 | G.telflags &= ~(UF_ECHO | UF_SGA);
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| 390 | setConMode();
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| 391 |
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| 392 | putiac2(DONT, TELOPT_ECHO);
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| 393 | putiac2(DONT, TELOPT_SGA);
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| 394 | iacflush();
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| 395 | }
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| 396 |
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[1770] | 397 | static void to_notsup(char c)
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[821] | 398 | {
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[1770] | 399 | if (G.telwish == WILL)
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| 400 | putiac2(DONT, c);
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| 401 | else if (G.telwish == DO)
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| 402 | putiac2(WONT, c);
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[821] | 403 | }
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| 404 |
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[1770] | 405 | static void to_echo(void)
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[821] | 406 | {
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| 407 | /* if server requests ECHO, don't agree */
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[1770] | 408 | if (G.telwish == DO) {
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| 409 | putiac2(WONT, TELOPT_ECHO);
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| 410 | return;
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| 411 | }
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| 412 | if (G.telwish == DONT)
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| 413 | return;
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[821] | 414 |
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[1770] | 415 | if (G.telflags & UF_ECHO) {
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[821] | 416 | if (G.telwish == WILL)
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| 417 | return;
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[1770] | 418 | } else if (G.telwish == WONT)
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| 419 | return;
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[821] | 420 |
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| 421 | if (G.charmode != CHM_OFF)
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| 422 | G.telflags ^= UF_ECHO;
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| 423 |
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| 424 | if (G.telflags & UF_ECHO)
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| 425 | putiac2(DO, TELOPT_ECHO);
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| 426 | else
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| 427 | putiac2(DONT, TELOPT_ECHO);
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| 428 |
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| 429 | setConMode();
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[1770] | 430 | write_str(1, "\r\n"); /* sudden modec */
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[821] | 431 | }
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| 432 |
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[1770] | 433 | static void to_sga(void)
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[821] | 434 | {
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| 435 | /* daemon always sends will/wont, client do/dont */
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| 436 |
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[1770] | 437 | if (G.telflags & UF_SGA) {
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[821] | 438 | if (G.telwish == WILL)
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| 439 | return;
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[1770] | 440 | } else if (G.telwish == WONT)
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| 441 | return;
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[821] | 442 |
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| 443 | if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
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| 444 | putiac2(DO, TELOPT_SGA);
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| 445 | else
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| 446 | putiac2(DONT, TELOPT_SGA);
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| 447 | }
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| 448 |
|
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[1770] | 449 | #if ENABLE_FEATURE_TELNET_TTYPE
|
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| 450 | static void to_ttype(void)
|
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[821] | 451 | {
|
---|
| 452 | /* Tell server we will (or won't) do TTYPE */
|
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| 453 |
|
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[1770] | 454 | if (G.ttype)
|
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[821] | 455 | putiac2(WILL, TELOPT_TTYPE);
|
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| 456 | else
|
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| 457 | putiac2(WONT, TELOPT_TTYPE);
|
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| 458 | }
|
---|
| 459 | #endif
|
---|
| 460 |
|
---|
[1770] | 461 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
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| 462 | static void to_new_environ(void)
|
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[821] | 463 | {
|
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| 464 | /* Tell server we will (or will not) do AUTOLOGIN */
|
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| 465 |
|
---|
[1770] | 466 | if (G.autologin)
|
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[821] | 467 | putiac2(WILL, TELOPT_NEW_ENVIRON);
|
---|
| 468 | else
|
---|
| 469 | putiac2(WONT, TELOPT_NEW_ENVIRON);
|
---|
| 470 | }
|
---|
| 471 | #endif
|
---|
| 472 |
|
---|
[1770] | 473 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
| 474 | static void to_naws(void)
|
---|
[821] | 475 | {
|
---|
| 476 | /* Tell server we will do NAWS */
|
---|
| 477 | putiac2(WILL, TELOPT_NAWS);
|
---|
| 478 | }
|
---|
| 479 | #endif
|
---|
| 480 |
|
---|
| 481 | static void telopt(byte c)
|
---|
| 482 | {
|
---|
[1770] | 483 | switch (c) {
|
---|
| 484 | case TELOPT_ECHO:
|
---|
| 485 | to_echo(); break;
|
---|
| 486 | case TELOPT_SGA:
|
---|
| 487 | to_sga(); break;
|
---|
| 488 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
| 489 | case TELOPT_TTYPE:
|
---|
| 490 | to_ttype(); break;
|
---|
[821] | 491 | #endif
|
---|
[1770] | 492 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
| 493 | case TELOPT_NEW_ENVIRON:
|
---|
| 494 | to_new_environ(); break;
|
---|
[821] | 495 | #endif
|
---|
[1770] | 496 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
| 497 | case TELOPT_NAWS:
|
---|
| 498 | to_naws();
|
---|
| 499 | putiac_naws(c, G.win_width, G.win_height);
|
---|
| 500 | break;
|
---|
[821] | 501 | #endif
|
---|
[1770] | 502 | default:
|
---|
| 503 | to_notsup(c);
|
---|
| 504 | break;
|
---|
[821] | 505 | }
|
---|
| 506 | }
|
---|
| 507 |
|
---|
| 508 | /* subnegotiation -- ignore all (except TTYPE,NAWS) */
|
---|
| 509 | static int subneg(byte c)
|
---|
| 510 | {
|
---|
[1770] | 511 | switch (G.telstate) {
|
---|
[821] | 512 | case TS_SUB1:
|
---|
| 513 | if (c == IAC)
|
---|
| 514 | G.telstate = TS_SUB2;
|
---|
[1770] | 515 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
[821] | 516 | else
|
---|
| 517 | if (c == TELOPT_TTYPE)
|
---|
[1770] | 518 | putiac_subopt(TELOPT_TTYPE, G.ttype);
|
---|
[821] | 519 | #endif
|
---|
[1770] | 520 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
[821] | 521 | else
|
---|
| 522 | if (c == TELOPT_NEW_ENVIRON)
|
---|
| 523 | putiac_subopt_autologin();
|
---|
| 524 | #endif
|
---|
| 525 | break;
|
---|
| 526 | case TS_SUB2:
|
---|
| 527 | if (c == SE)
|
---|
| 528 | return TRUE;
|
---|
| 529 | G.telstate = TS_SUB1;
|
---|
| 530 | /* break; */
|
---|
| 531 | }
|
---|
| 532 | return FALSE;
|
---|
| 533 | }
|
---|
| 534 |
|
---|
| 535 | static void fgotsig(int sig)
|
---|
| 536 | {
|
---|
| 537 | G.gotsig = sig;
|
---|
| 538 | }
|
---|
| 539 |
|
---|
| 540 |
|
---|
| 541 | static void rawmode(void)
|
---|
| 542 | {
|
---|
[1770] | 543 | if (G.do_termios)
|
---|
| 544 | tcsetattr(0, TCSADRAIN, &G.termios_raw);
|
---|
[821] | 545 | }
|
---|
| 546 |
|
---|
| 547 | static void cookmode(void)
|
---|
| 548 | {
|
---|
[1770] | 549 | if (G.do_termios)
|
---|
| 550 | tcsetattr(0, TCSADRAIN, &G.termios_def);
|
---|
[821] | 551 | }
|
---|
| 552 |
|
---|
[1770] | 553 | int telnet_main(int argc, char** argv);
|
---|
[821] | 554 | int telnet_main(int argc, char** argv)
|
---|
| 555 | {
|
---|
[1770] | 556 | char *host;
|
---|
| 557 | int port;
|
---|
[821] | 558 | int len;
|
---|
| 559 | #ifdef USE_POLL
|
---|
| 560 | struct pollfd ufds[2];
|
---|
| 561 | #else
|
---|
| 562 | fd_set readfds;
|
---|
| 563 | int maxfd;
|
---|
| 564 | #endif
|
---|
| 565 |
|
---|
[1770] | 566 | INIT_G();
|
---|
| 567 |
|
---|
| 568 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
| 569 | get_terminal_width_height(0, &G.win_width, &G.win_height);
|
---|
[821] | 570 | #endif
|
---|
| 571 |
|
---|
[1770] | 572 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
| 573 | G.ttype = getenv("TERM");
|
---|
[821] | 574 | #endif
|
---|
| 575 |
|
---|
| 576 | if (tcgetattr(0, &G.termios_def) >= 0) {
|
---|
| 577 | G.do_termios = 1;
|
---|
| 578 | G.termios_raw = G.termios_def;
|
---|
| 579 | cfmakeraw(&G.termios_raw);
|
---|
| 580 | }
|
---|
| 581 |
|
---|
| 582 | if (argc < 2)
|
---|
| 583 | bb_show_usage();
|
---|
| 584 |
|
---|
[1770] | 585 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
| 586 | if (1 & getopt32(argv, "al:", &G.autologin))
|
---|
| 587 | G.autologin = getenv("USER");
|
---|
| 588 | argv += optind;
|
---|
[821] | 589 | #else
|
---|
[1770] | 590 | argv++;
|
---|
[821] | 591 | #endif
|
---|
[1770] | 592 | if (!*argv)
|
---|
| 593 | bb_show_usage();
|
---|
| 594 | host = *argv++;
|
---|
| 595 | port = bb_lookup_port(*argv ? *argv++ : "telnet", "tcp", 23);
|
---|
| 596 | if (*argv) /* extra params?? */
|
---|
| 597 | bb_show_usage();
|
---|
[821] | 598 |
|
---|
[1770] | 599 | G.netfd = create_and_connect_stream_or_die(host, port);
|
---|
[821] | 600 |
|
---|
[1770] | 601 | setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
|
---|
[821] | 602 |
|
---|
| 603 | signal(SIGINT, fgotsig);
|
---|
| 604 |
|
---|
| 605 | #ifdef USE_POLL
|
---|
| 606 | ufds[0].fd = 0; ufds[1].fd = G.netfd;
|
---|
| 607 | ufds[0].events = ufds[1].events = POLLIN;
|
---|
| 608 | #else
|
---|
| 609 | FD_ZERO(&readfds);
|
---|
| 610 | FD_SET(0, &readfds);
|
---|
| 611 | FD_SET(G.netfd, &readfds);
|
---|
| 612 | maxfd = G.netfd + 1;
|
---|
| 613 | #endif
|
---|
| 614 |
|
---|
[1770] | 615 | while (1) {
|
---|
[821] | 616 | #ifndef USE_POLL
|
---|
| 617 | fd_set rfds = readfds;
|
---|
| 618 |
|
---|
| 619 | switch (select(maxfd, &rfds, NULL, NULL, NULL))
|
---|
| 620 | #else
|
---|
| 621 | switch (poll(ufds, 2, -1))
|
---|
| 622 | #endif
|
---|
| 623 | {
|
---|
| 624 | case 0:
|
---|
| 625 | /* timeout */
|
---|
| 626 | case -1:
|
---|
| 627 | /* error, ignore and/or log something, bay go to loop */
|
---|
| 628 | if (G.gotsig)
|
---|
| 629 | conescape();
|
---|
| 630 | else
|
---|
| 631 | sleep(1);
|
---|
| 632 | break;
|
---|
| 633 | default:
|
---|
| 634 |
|
---|
| 635 | #ifdef USE_POLL
|
---|
| 636 | if (ufds[0].revents) /* well, should check POLLIN, but ... */
|
---|
| 637 | #else
|
---|
| 638 | if (FD_ISSET(0, &rfds))
|
---|
| 639 | #endif
|
---|
| 640 | {
|
---|
| 641 | len = read(0, G.buf, DATABUFSIZE);
|
---|
| 642 | if (len <= 0)
|
---|
| 643 | doexit(0);
|
---|
| 644 | TRACE(0, ("Read con: %d\n", len));
|
---|
| 645 | handlenetoutput(len);
|
---|
| 646 | }
|
---|
| 647 |
|
---|
| 648 | #ifdef USE_POLL
|
---|
| 649 | if (ufds[1].revents) /* well, should check POLLIN, but ... */
|
---|
| 650 | #else
|
---|
| 651 | if (FD_ISSET(G.netfd, &rfds))
|
---|
| 652 | #endif
|
---|
| 653 | {
|
---|
| 654 | len = read(G.netfd, G.buf, DATABUFSIZE);
|
---|
[1770] | 655 | if (len <= 0) {
|
---|
| 656 | write_str(1, "Connection closed by foreign host\r\n");
|
---|
[821] | 657 | doexit(1);
|
---|
| 658 | }
|
---|
| 659 | TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
|
---|
| 660 | handlenetinput(len);
|
---|
| 661 | }
|
---|
| 662 | }
|
---|
| 663 | }
|
---|
| 664 | }
|
---|