From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/router/busybox/telnet.c | 669 ------------------------------------ 1 file changed, 669 deletions(-) delete mode 100644 release/src/router/busybox/telnet.c (limited to 'release/src/router/busybox/telnet.c') diff --git a/release/src/router/busybox/telnet.c b/release/src/router/busybox/telnet.c deleted file mode 100644 index b54b7c44..00000000 --- a/release/src/router/busybox/telnet.c +++ /dev/null @@ -1,669 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* - * telnet implementation for busybox - * - * Author: Tomi Ollila - * Copyright (C) 1994-2000 by Tomi Ollila - * - * 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 - * - * HISTORY - * Revision 3.1 1994/04/17 11:31:54 too - * initial revision - * Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen - * - * Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan - * - * - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "busybox.h" - - -#ifdef DOTRACE -#include /* for inet_ntoa()... */ -#define TRACE(x, y) do { if (x) printf y; } while (0) -#else -#define TRACE(x, y) -#endif - -#include - -#define DATABUFSIZE 128 -#define IACBUFSIZE 128 - -static const int CHM_TRY = 0; -static const int CHM_ON = 1; -static const int CHM_OFF = 2; - -static const int UF_ECHO = 0x01; -static const int UF_SGA = 0x02; - -enum { - TS_0 = 1, - TS_IAC = 2, - TS_OPT = 3, - TS_SUB1 = 4, - 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 */ - byte telstate; /* telnet negotiation state from network input */ - byte telwish; /* DO, DONT, WILL, WONT */ - byte charmode; - byte telflags; - byte gotsig; - /* 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) -#else -static struct Globalvars G; -#endif - -static inline void iacflush() -{ - write(G.netfd, G.iacbuf, G.iaclen); - G.iaclen = 0; -} - -/* Function prototypes */ -static int getport(char * p); -static struct in_addr getserver(char * p); -static int create_socket(); -static void setup_sockaddr_in(struct sockaddr_in * addr, int port); -static int remote_connect(struct in_addr addr, int port); -static void rawmode(); -static void cookmode(); -static void do_linemode(); -static void will_charmode(); -static void telopt(byte c); -static int subneg(byte c); - -/* Some globals */ -static int one = 1; - -#ifdef BB_FEATURE_TELNET_TTYPE -static char *ttype; -#endif - -static void doexit(int ev) -{ - cookmode(); - exit(ev); -} - -static void conescape() -{ - char b; - - if (G.gotsig) /* came from line mode... go raw */ - rawmode(); - - WriteCS(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); - - switch (b) - { - case 'l': - if (!G.gotsig) - { - do_linemode(); - goto rrturn; - } - break; - case 'c': - if (G.gotsig) - { - will_charmode(); - goto rrturn; - } - break; - case 'z': - cookmode(); - kill(0, SIGTSTP); - rawmode(); - break; - case 'e': - doexit(0); - } - - WriteCS(1, "continuing...\r\n"); - - if (G.gotsig) - cookmode(); - - rrturn: - G.gotsig = 0; - -} -static void handlenetoutput(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 */ - - int i; - byte * p = G.buf; - - for (i = len; i > 0; i--, p++) - { - if (*p == 0x1d) - { - conescape(); - return; - } - if (*p == 0xff) - *p = 0x7f; - } - write(G.netfd, G.buf, len); -} - - -static void handlenetinput(int len) -{ - int i; - int cstart = 0; - - for (i = 0; i < len; i++) - { - byte c = G.buf[i]; - - if (G.telstate == 0) /* most of the time state == 0 */ - { - if (c == IAC) - { - cstart = i; - G.telstate = TS_IAC; - } - } - 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) == TRUE) - G.telstate = TS_0; - break; - } - } - if (G.telstate) - { - if (G.iaclen) iacflush(); - if (G.telstate == TS_0) G.telstate = 0; - - len = cstart; - } - - if (len) - write(1, G.buf, len); -} - - -/* ******************************* */ - -static inline void putiac(int c) -{ - G.iacbuf[G.iaclen++] = c; -} - - -static void putiac2(byte wwdd, byte c) -{ - if (G.iaclen + 3 > IACBUFSIZE) - iacflush(); - - putiac(IAC); - putiac(wwdd); - putiac(c); -} - - -#ifdef BB_FEATURE_TELNET_TTYPE -static void putiac_subopt(byte c, char *str) -{ - int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 ) - - if (G.iaclen + len > IACBUFSIZE) - iacflush(); - - putiac(IAC); - putiac(SB); - putiac(c); - putiac(0); - - while(*str) - putiac(*str++); - - putiac(IAC); - putiac(SE); -} -#endif - -/* void putiacstring (subneg strings) */ - -/* ******************************* */ - -static char const escapecharis[] = "\r\nEscape character is "; - -static void setConMode() -{ - 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 - { - if (G.charmode != CHM_OFF) { - G.charmode = CHM_OFF; - printf("\r\nEntering line mode%s'^C'.\r\n", escapecharis); - cookmode(); - } - } -} - -/* ******************************* */ - -static void will_charmode() -{ - G.charmode = CHM_TRY; - G.telflags |= (UF_ECHO | UF_SGA); - setConMode(); - - putiac2(DO, TELOPT_ECHO); - putiac2(DO, TELOPT_SGA); - iacflush(); -} - -static void do_linemode() -{ - G.charmode = CHM_TRY; - G.telflags &= ~(UF_ECHO | UF_SGA); - setConMode(); - - putiac2(DONT, TELOPT_ECHO); - putiac2(DONT, TELOPT_SGA); - iacflush(); -} - -/* ******************************* */ - -static inline void to_notsup(char c) -{ - if (G.telwish == WILL) putiac2(DONT, c); - else if (G.telwish == DO) putiac2(WONT, c); -} - -static inline void to_echo() -{ - /* 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; - } - else - if (G.telwish == WONT) - return; - - if (G.charmode != CHM_OFF) - G.telflags ^= UF_ECHO; - - if (G.telflags & UF_ECHO) - putiac2(DO, TELOPT_ECHO); - else - putiac2(DONT, TELOPT_ECHO); - - setConMode(); - WriteCS(1, "\r\n"); /* sudden modec */ -} - -static inline void to_sga() -{ - /* daemon always sends will/wont, client do/dont */ - - 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); - - return; -} - -#ifdef BB_FEATURE_TELNET_TTYPE -static inline void to_ttype() -{ - /* Tell server we will (or won't) do TTYPE */ - - if(ttype) - putiac2(WILL, TELOPT_TTYPE); - else - putiac2(WONT, TELOPT_TTYPE); - - return; -} -#endif - -static void telopt(byte c) -{ - switch (c) - { - case TELOPT_ECHO: to_echo(c); break; - case TELOPT_SGA: to_sga(c); break; -#ifdef BB_FEATURE_TELNET_TTYPE - case TELOPT_TTYPE: to_ttype(c); break; -#endif - default: to_notsup(c); break; - } -} - - -/* ******************************* */ - -/* subnegotiation -- ignore all (except TTYPE) */ - -static int subneg(byte c) -{ - switch (G.telstate) - { - case TS_SUB1: - if (c == IAC) - G.telstate = TS_SUB2; -#ifdef BB_FEATURE_TELNET_TTYPE - else - if (c == TELOPT_TTYPE) - putiac_subopt(TELOPT_TTYPE,ttype); -#endif - break; - case TS_SUB2: - if (c == SE) - return TRUE; - G.telstate = TS_SUB1; - /* break; */ - } - return FALSE; -} - -/* ******************************* */ - -static void fgotsig(int sig) -{ - G.gotsig = sig; -} - - -static void rawmode() -{ - tcsetattr(0, TCSADRAIN, &G.termios_raw); -} - -static void cookmode() -{ - tcsetattr(0, TCSADRAIN, &G.termios_def); -} - -extern int telnet_main(int argc, char** argv) -{ - struct in_addr host; - int port; - int len; -#ifdef USE_POLL - struct pollfd ufds[2]; -#else - fd_set readfds; - int maxfd; -#endif - -#ifdef BB_FEATURE_TELNET_TTYPE - ttype = getenv("TERM"); -#endif - - memset(&G, 0, sizeof G); - - if (tcgetattr(0, &G.termios_def) < 0) - exit(1); - - G.termios_raw = G.termios_def; - cfmakeraw(&G.termios_raw); - - if (argc < 2) show_usage(); - port = (argc > 2)? getport(argv[2]): 23; - - host = getserver(argv[1]); - - G.netfd = remote_connect(host, port); - - signal(SIGINT, fgotsig); - -#ifdef USE_POLL - ufds[0].fd = 0; ufds[1].fd = G.netfd; - ufds[0].events = ufds[1].events = POLLIN; -#else - FD_ZERO(&readfds); - FD_SET(0, &readfds); - FD_SET(G.netfd, &readfds); - maxfd = G.netfd + 1; -#endif - - while (1) - { -#ifndef USE_POLL - fd_set rfds = readfds; - - switch (select(maxfd, &rfds, NULL, NULL, NULL)) -#else - switch (poll(ufds, 2, -1)) -#endif - { - case 0: - /* timeout */ - case -1: - /* error, ignore and/or log something, bay go to loop */ - if (G.gotsig) - conescape(); - else - sleep(1); - break; - default: - -#ifdef USE_POLL - if (ufds[0].revents) /* well, should check POLLIN, but ... */ -#else - if (FD_ISSET(0, &rfds)) -#endif - { - len = read(0, G.buf, DATABUFSIZE); - - if (len <= 0) - doexit(0); - - TRACE(0, ("Read con: %d\n", len)); - - handlenetoutput(len); - } - -#ifdef USE_POLL - if (ufds[1].revents) /* well, should check POLLIN, but ... */ -#else - if (FD_ISSET(G.netfd, &rfds)) -#endif - { - len = read(G.netfd, G.buf, DATABUFSIZE); - - if (len <= 0) - { - WriteCS(1, "Connection closed by foreign host.\r\n"); - doexit(1); - } - TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len)); - - handlenetinput(len); - } - } - } -} - -static int getport(char * p) -{ - unsigned int port = atoi(p); - - if ((unsigned)(port - 1 ) > 65534) - { - error_msg_and_die("%s: bad port number", p); - } - return port; -} - -static struct in_addr getserver(char * host) -{ - struct in_addr addr; - - struct hostent * he; - he = xgethostbyname(host); - memcpy(&addr, he->h_addr, sizeof addr); - - TRACE(1, ("addr: %s\n", inet_ntoa(addr))); - - return addr; -} - -static int create_socket() -{ - return socket(AF_INET, SOCK_STREAM, 0); -} - -static void setup_sockaddr_in(struct sockaddr_in * addr, int port) -{ - memset(addr, 0, sizeof(struct sockaddr_in)); - addr->sin_family = AF_INET; - addr->sin_port = htons(port); -} - - -static int remote_connect(struct in_addr addr, int port) -{ - struct sockaddr_in s_addr; - int s = create_socket(); - - setup_sockaddr_in(&s_addr, port); - s_addr.sin_addr = addr; - - setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one); - - if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0) - { - perror_msg_and_die("Unable to connect to remote host"); - } - return s; -} - -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ - -- cgit v1.2.3-54-g00ecf