[bd520203] | 1 | /***********************************************************/ |
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[b2712e3] | 2 | /* |
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[bd520203] | 3 | * |
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| 4 | * The telnet DAEMON |
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| 5 | * |
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| 6 | * Author: 17,may 2001 |
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| 7 | * |
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[8a775c27] | 8 | * WORK: fernando.ruiz@ctv.es |
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[bd520203] | 9 | * HOME: correo@fernando-ruiz.com |
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| 10 | * |
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| 11 | * After start the net you can start this daemon. |
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| 12 | * It uses the previously inited pseudo-terminales (pty.c) |
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| 13 | * getting a new terminal with getpty(). This function |
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| 14 | * gives a terminal name passing a opened socket like parameter. |
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| 15 | * |
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| 16 | * With register_telnetd() you add a new command in the shell to start |
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| 17 | * this daemon interactively. (Login in /dev/console of course) |
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[8a775c27] | 18 | * |
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[bd520203] | 19 | * Sorry but OOB is not still implemented. (This is the first version) |
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[b5bf8cd1] | 20 | * |
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| 21 | * Till Straumann <strauman@slac.stanford.edu> |
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| 22 | * - made the 'shell' interface more generic, i.e. it is now |
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| 23 | * possible to have 'telnetd' run an arbitrary 'shell' |
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| 24 | * program. |
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[081583c] | 25 | * |
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[cbd1e87] | 26 | * Copyright (c) 2009 embedded brains GmbH and others. |
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| 27 | * |
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[8a775c27] | 28 | * embedded brains GmbH |
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| 29 | * Obere Lagerstr. 30 |
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| 30 | * D-82178 Puchheim |
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| 31 | * Germany |
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| 32 | * <rtems@embedded-brains.de> |
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| 33 | * |
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| 34 | * The license and distribution terms for this file may be |
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| 35 | * found in the file LICENSE in this distribution or at |
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| 36 | * http://www.rtems.com/license/LICENSE. |
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| 37 | * |
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| 38 | * $Id$ |
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[b2712e3] | 39 | */ |
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[b5bf8cd1] | 40 | |
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[bd520203] | 41 | #ifdef HAVE_CONFIG_H |
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| 42 | #include "config.h" |
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| 43 | #endif |
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[b2712e3] | 44 | |
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| 45 | #include <rtems.h> |
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| 46 | #include <rtems/error.h> |
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[bd520203] | 47 | #include <rtems/pty.h> |
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[b2712e3] | 48 | #include <rtems/shell.h> |
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| 49 | #include <rtems/telnetd.h> |
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[b5bf8cd1] | 50 | #include <rtems/bspIo.h> |
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[b2712e3] | 51 | #include <sys/socket.h> |
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| 52 | #include <netinet/in.h> |
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| 53 | #include <arpa/inet.h> |
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| 54 | #include <unistd.h> |
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| 55 | #include <stdlib.h> |
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| 56 | #include <stdio.h> |
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[b5bf8cd1] | 57 | #include <assert.h> |
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| 58 | #include <string.h> |
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| 59 | #include <syslog.h> |
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| 60 | |
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| 61 | #include <rtems/userenv.h> |
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| 62 | #include <rtems/error.h> |
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| 63 | #include <rtems/rtems_bsdnet.h> |
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| 64 | |
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| 65 | #define PARANOIA |
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| 66 | |
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| 67 | extern char *telnet_get_pty(int socket); |
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[c0cc985] | 68 | extern int telnet_pty_initialize(void); |
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[b5bf8cd1] | 69 | |
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| 70 | struct shell_args { |
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[edcb982] | 71 | char *devname; |
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| 72 | void *arg; |
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| 73 | char peername[16]; |
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| 74 | char delete_myself; |
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[b5bf8cd1] | 75 | }; |
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| 76 | |
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| 77 | typedef union uni_sa { |
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[edcb982] | 78 | struct sockaddr_in sin; |
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[8ad6681b] | 79 | struct sockaddr sa; |
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[b5bf8cd1] | 80 | } uni_sa; |
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| 81 | |
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| 82 | static int sockpeername(int sock, char *buf, int bufsz); |
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| 83 | |
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[8a775c27] | 84 | void *telnetd_dflt_spawn( |
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[edcb982] | 85 | const char *name, |
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| 86 | unsigned priority, |
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| 87 | unsigned stackSize, |
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| 88 | void (*fn)(void*), |
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| 89 | void *fnarg |
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| 90 | ); |
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[79061679] | 91 | |
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[b2712e3] | 92 | /***********************************************************/ |
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[8a775c27] | 93 | static rtems_id telnetd_task_id = RTEMS_ID_NONE; |
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| 94 | |
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| 95 | void *(*telnetd_spawn_task)( |
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[1fae7b43] | 96 | const char *, |
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| 97 | unsigned, |
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| 98 | unsigned, |
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| 99 | void (*)(void*), |
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[8a775c27] | 100 | void * |
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| 101 | ) = telnetd_dflt_spawn; |
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[1fae7b43] | 102 | |
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| 103 | static char *grab_a_Connection( |
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| 104 | int des_socket, |
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| 105 | uni_sa *srv, |
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| 106 | char *peername, |
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| 107 | int sz |
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| 108 | ) |
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[b5bf8cd1] | 109 | { |
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[edcb982] | 110 | char *rval = 0; |
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[b5bf8cd1] | 111 | #if 0 |
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[edcb982] | 112 | socklen_t size_adr = sizeof(srv->sin); |
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[b5bf8cd1] | 113 | #else |
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[edcb982] | 114 | /* 4.6 doesn't have socklen_t */ |
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| 115 | uint32_t size_adr = sizeof(srv->sin); |
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[b5bf8cd1] | 116 | #endif |
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[edcb982] | 117 | int acp_sock; |
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[b5bf8cd1] | 118 | |
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[8ad6681b] | 119 | acp_sock = accept(des_socket,&srv->sa,&size_adr); |
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[b5bf8cd1] | 120 | |
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[8ad6681b] | 121 | if (acp_sock<0) { |
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| 122 | perror("telnetd:accept"); |
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| 123 | goto bailout; |
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| 124 | }; |
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[b5bf8cd1] | 125 | |
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[8ad6681b] | 126 | if ( !(rval=telnet_get_pty(acp_sock)) ) { |
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| 127 | syslog( LOG_DAEMON | LOG_ERR, "telnetd: unable to obtain PTY"); |
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| 128 | /* NOTE: failing 'do_get_pty()' closed the socket */ |
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| 129 | goto bailout; |
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| 130 | } |
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[b5bf8cd1] | 131 | |
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[8ad6681b] | 132 | if (sockpeername(acp_sock, peername, sz)) |
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| 133 | strncpy(peername, "<UNKNOWN>", sz); |
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[b5bf8cd1] | 134 | |
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| 135 | #ifdef PARANOIA |
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[8ad6681b] | 136 | syslog(LOG_DAEMON | LOG_INFO, |
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| 137 | "telnetd: accepted connection from %s on %s", |
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| 138 | peername, |
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| 139 | rval); |
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[b5bf8cd1] | 140 | #endif |
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| 141 | |
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| 142 | bailout: |
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| 143 | |
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[8ad6681b] | 144 | return rval; |
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[b5bf8cd1] | 145 | } |
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| 146 | |
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| 147 | |
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| 148 | static void release_a_Connection(char *devname, char *peername, FILE **pstd, int n) |
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| 149 | { |
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| 150 | |
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| 151 | #ifdef PARANOIA |
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[8ad6681b] | 152 | syslog( LOG_DAEMON | LOG_INFO, |
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| 153 | "telnetd: releasing connection from %s on %s", |
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| 154 | peername, |
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| 155 | devname ); |
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[b5bf8cd1] | 156 | #endif |
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| 157 | |
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[8ad6681b] | 158 | while (--n>=0) |
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| 159 | if (pstd[n]) fclose(pstd[n]); |
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[b5bf8cd1] | 160 | |
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| 161 | } |
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| 162 | |
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| 163 | static int sockpeername(int sock, char *buf, int bufsz) |
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| 164 | { |
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[edcb982] | 165 | uni_sa peer; |
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| 166 | int rval = sock < 0; |
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[b5bf8cd1] | 167 | #if 0 |
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[edcb982] | 168 | socklen_t len = sizeof(peer.sin); |
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[b5bf8cd1] | 169 | #else |
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[edcb982] | 170 | /* 4.6 doesn't have socklen_t */ |
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| 171 | uint32_t len = sizeof(peer.sin); |
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[b5bf8cd1] | 172 | #endif |
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| 173 | |
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[edcb982] | 174 | if ( !rval ) |
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[8ad6681b] | 175 | rval = getpeername(sock, &peer.sa, &len); |
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[b5bf8cd1] | 176 | |
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[8ad6681b] | 177 | if ( !rval ) |
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| 178 | rval = !inet_ntop( AF_INET, &peer.sin.sin_addr, buf, bufsz ); |
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[b5bf8cd1] | 179 | |
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[8ad6681b] | 180 | return rval; |
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[b5bf8cd1] | 181 | } |
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| 182 | |
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| 183 | static void |
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| 184 | spawned_shell(void *arg); |
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| 185 | |
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[b2712e3] | 186 | /***********************************************************/ |
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[b5bf8cd1] | 187 | static void |
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| 188 | rtems_task_telnetd(void *task_argument) |
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| 189 | { |
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[edcb982] | 190 | int des_socket; |
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| 191 | uni_sa srv; |
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| 192 | char *devname; |
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| 193 | char peername[16]; |
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| 194 | int i=1; |
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| 195 | int size_adr; |
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[1fae7b43] | 196 | struct shell_args *arg = NULL; |
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[b5bf8cd1] | 197 | |
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[8ad6681b] | 198 | if ((des_socket=socket(PF_INET,SOCK_STREAM,0))<0) { |
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| 199 | perror("telnetd:socket"); |
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[8a775c27] | 200 | telnetd_task_id = RTEMS_ID_NONE; |
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[8ad6681b] | 201 | rtems_task_delete(RTEMS_SELF); |
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| 202 | }; |
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| 203 | setsockopt(des_socket,SOL_SOCKET,SO_KEEPALIVE,&i,sizeof(i)); |
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| 204 | |
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| 205 | memset(&srv,0,sizeof(srv)); |
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| 206 | srv.sin.sin_family=AF_INET; |
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| 207 | srv.sin.sin_port=htons(23); |
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| 208 | size_adr=sizeof(srv.sin); |
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| 209 | if ((bind(des_socket,&srv.sa,size_adr))<0) { |
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| 210 | perror("telnetd:bind"); |
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[1fae7b43] | 211 | close(des_socket); |
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[8a775c27] | 212 | telnetd_task_id = RTEMS_ID_NONE; |
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[8ad6681b] | 213 | rtems_task_delete(RTEMS_SELF); |
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| 214 | }; |
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| 215 | if ((listen(des_socket,5))<0) { |
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| 216 | perror("telnetd:listen"); |
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| 217 | close(des_socket); |
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[8a775c27] | 218 | telnetd_task_id = RTEMS_ID_NONE; |
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[8ad6681b] | 219 | rtems_task_delete(RTEMS_SELF); |
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| 220 | }; |
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| 221 | |
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| 222 | /* we don't redirect stdio as this probably |
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| 223 | * was started from the console anyways.. |
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| 224 | */ |
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| 225 | do { |
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[8a775c27] | 226 | if (rtems_telnetd_config.keep_stdio) { |
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| 227 | bool start = true; |
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| 228 | char device_name [32]; |
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| 229 | |
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| 230 | ttyname_r( 1, device_name, sizeof( device_name)); |
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| 231 | if (rtems_telnetd_config.login_check != NULL) { |
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| 232 | start = rtems_shell_login_prompt( |
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| 233 | stdin, |
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| 234 | stderr, |
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| 235 | device_name, |
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| 236 | rtems_telnetd_config.login_check |
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| 237 | ); |
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| 238 | } |
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| 239 | if (start) { |
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| 240 | rtems_telnetd_config.command( device_name, arg->arg); |
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| 241 | } else { |
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| 242 | syslog( |
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| 243 | LOG_AUTHPRIV | LOG_WARNING, |
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| 244 | "telnetd: to many wrong passwords entered from %s", |
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| 245 | device_name |
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| 246 | ); |
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| 247 | } |
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[8ad6681b] | 248 | } else { |
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[1fae7b43] | 249 | devname = grab_a_Connection(des_socket, &srv, peername, sizeof(peername)); |
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| 250 | |
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| 251 | if ( !devname ) { |
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[8a775c27] | 252 | /* if something went wrong, sleep for some time */ |
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| 253 | sleep(10); |
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| 254 | continue; |
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[1fae7b43] | 255 | } |
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| 256 | |
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[edcb982] | 257 | arg = malloc( sizeof(*arg) ); |
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[8ad6681b] | 258 | |
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[edcb982] | 259 | arg->devname = devname; |
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[8a775c27] | 260 | arg->arg = rtems_telnetd_config.arg; |
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[edcb982] | 261 | strncpy(arg->peername, peername, sizeof(arg->peername)); |
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[8ad6681b] | 262 | |
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[8a775c27] | 263 | telnetd_task_id = (rtems_id) telnetd_spawn_task( |
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| 264 | devname, |
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| 265 | rtems_telnetd_config.priority, |
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| 266 | rtems_telnetd_config.stack_size, |
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| 267 | spawned_shell, |
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| 268 | arg |
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| 269 | ); |
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| 270 | if (telnetd_task_id == RTEMS_ID_NONE) { |
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[edcb982] | 271 | FILE *dummy; |
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[8ad6681b] | 272 | |
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[edcb982] | 273 | if ( telnetd_spawn_task != telnetd_dflt_spawn ) { |
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| 274 | fprintf(stderr,"Telnetd: Unable to spawn child task\n"); |
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| 275 | } |
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[8ad6681b] | 276 | |
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[edcb982] | 277 | /* hmm - the pty driver slot can only be |
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| 278 | * released by opening and subsequently |
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| 279 | * closing the PTY - this also closes |
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| 280 | * the underlying socket. So we mock up |
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| 281 | * a stream... |
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| 282 | */ |
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[8ad6681b] | 283 | |
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[edcb982] | 284 | if ( !(dummy=fopen(devname,"r+")) ) |
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| 285 | perror("Unable to dummy open the pty, losing a slot :-("); |
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| 286 | release_a_Connection(devname, peername, &dummy, 1); |
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| 287 | free(arg); |
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| 288 | sleep(2); /* don't accept connections too fast */ |
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| 289 | } |
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[8ad6681b] | 290 | } |
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| 291 | } while(1); |
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[edcb982] | 292 | |
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[8a775c27] | 293 | /* TODO: how to free the connection semaphore? But then - |
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[8ad6681b] | 294 | * stopping the daemon is probably only needed during |
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| 295 | * development/debugging. |
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| 296 | * Finalizer code should collect all the connection semaphore |
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| 297 | * counts and eventually clean up... |
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| 298 | */ |
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| 299 | close(des_socket); |
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[8a775c27] | 300 | telnetd_task_id = RTEMS_ID_NONE; |
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[b2712e3] | 301 | } |
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[b5bf8cd1] | 302 | |
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[8a775c27] | 303 | rtems_status_code rtems_telnetd_initialize( void) |
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[b5bf8cd1] | 304 | { |
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[8a775c27] | 305 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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[8ad6681b] | 306 | |
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[8a775c27] | 307 | if (telnetd_task_id != RTEMS_ID_NONE) { |
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| 308 | fprintf(stderr, "telnetd already started\n"); |
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| 309 | return RTEMS_RESOURCE_IN_USE; |
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[8ad6681b] | 310 | } |
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| 311 | |
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[8a775c27] | 312 | if (rtems_telnetd_config.command == NULL) { |
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| 313 | fprintf(stderr, "telnetd setup with invalid command\n"); |
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| 314 | return RTEMS_IO_ERROR; |
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| 315 | } |
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[8ad6681b] | 316 | |
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| 317 | if ( !telnet_pty_initialize() ) { |
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[8a775c27] | 318 | fprintf(stderr, "telnetd cannot initialize PTY driver\n"); |
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| 319 | return RTEMS_IO_ERROR; |
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[8ad6681b] | 320 | } |
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| 321 | |
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[8a775c27] | 322 | /* Check priority */ |
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| 323 | if (rtems_telnetd_config.priority <= 0) { |
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| 324 | rtems_telnetd_config.priority = rtems_bsdnet_config.network_task_priority; |
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| 325 | } |
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| 326 | if (rtems_telnetd_config.priority < 2) { |
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| 327 | rtems_telnetd_config.priority = 100; |
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| 328 | } |
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[edcb982] | 329 | |
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[8a775c27] | 330 | /* Check stack size */ |
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| 331 | if (rtems_telnetd_config.stack_size <= 0) { |
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| 332 | rtems_telnetd_config.stack_size = 32 * 1024; |
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[8ad6681b] | 333 | } |
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[8a775c27] | 334 | |
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| 335 | /* Spawn task */ |
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| 336 | telnetd_task_id = (rtems_id) telnetd_spawn_task( |
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| 337 | "TNTD", |
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| 338 | rtems_telnetd_config.priority, |
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| 339 | RTEMS_MINIMUM_STACK_SIZE, |
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| 340 | rtems_task_telnetd, |
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| 341 | 0 |
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| 342 | ); |
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| 343 | if (telnetd_task_id == RTEMS_ID_NONE) { |
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| 344 | return RTEMS_IO_ERROR; |
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| 345 | } |
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| 346 | |
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| 347 | /* Print status */ |
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| 348 | if (!rtems_telnetd_config.keep_stdio) { |
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| 349 | fprintf( |
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| 350 | stderr, |
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| 351 | "telnetd started with stacksize = %u and priority = %d\n", |
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| 352 | (unsigned) rtems_telnetd_config.stack_size, |
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| 353 | (unsigned) rtems_telnetd_config.priority |
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| 354 | ); |
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| 355 | } |
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| 356 | |
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| 357 | return RTEMS_SUCCESSFUL; |
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[b2712e3] | 358 | } |
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[b5bf8cd1] | 359 | |
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| 360 | /* utility wrapper */ |
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| 361 | static void |
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| 362 | spawned_shell(void *targ) |
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| 363 | { |
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[edcb982] | 364 | rtems_status_code sc; |
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| 365 | FILE *nstd[3]={0}; |
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| 366 | FILE *ostd[3]={ stdin, stdout, stderr }; |
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| 367 | int i=0; |
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| 368 | struct shell_args *arg = targ; |
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[8a775c27] | 369 | bool login_failed = false; |
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| 370 | bool start = true; |
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[b5bf8cd1] | 371 | |
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[8ad6681b] | 372 | sc=rtems_libio_set_private_env(); |
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[b5bf8cd1] | 373 | |
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[8ad6681b] | 374 | /* newlib hack/workaround. Before we change stdin/out/err we must make |
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[b5bf8cd1] | 375 | * sure the internal data are initialized (fileno(stdout) has this sideeffect). |
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[8ad6681b] | 376 | * This should probably be done from RTEMS' libc support layer... |
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| 377 | * (T.S., newlibc-1.13; 2005/10) |
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[b5bf8cd1] | 378 | */ |
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| 379 | |
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[8ad6681b] | 380 | fileno(stdout); |
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[b5bf8cd1] | 381 | |
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[8ad6681b] | 382 | if (RTEMS_SUCCESSFUL != sc) { |
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| 383 | rtems_error(sc,"rtems_libio_set_private_env"); |
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| 384 | goto cleanup; |
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| 385 | } |
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[b5bf8cd1] | 386 | |
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[8ad6681b] | 387 | /* redirect stdio */ |
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| 388 | for (i=0; i<3; i++) { |
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| 389 | if ( !(nstd[i]=fopen(arg->devname,"r+")) ) { |
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| 390 | perror("unable to open stdio"); |
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| 391 | goto cleanup; |
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| 392 | } |
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| 393 | } |
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[b5bf8cd1] | 394 | |
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[8ad6681b] | 395 | stdin = nstd[0]; |
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| 396 | stdout = nstd[1]; |
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| 397 | stderr = nstd[2]; |
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[b5bf8cd1] | 398 | |
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[edcb982] | 399 | #if 0 |
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| 400 | printk("STDOUT is now %x (%x) (FD %i/%i)\n", |
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| 401 | stdout,nstd[1],fileno(stdout),fileno(nstd[1])); |
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| 402 | printf("hello\n"); |
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| 403 | write(fileno(stdout),"hellofd\n",8); |
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| 404 | #endif |
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[b5bf8cd1] | 405 | |
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[8ad6681b] | 406 | /* call their routine */ |
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[8a775c27] | 407 | if (rtems_telnetd_config.login_check != NULL) { |
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| 408 | start = rtems_shell_login_prompt( |
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| 409 | stdin, |
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| 410 | stderr, |
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| 411 | arg->devname, |
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| 412 | rtems_telnetd_config.login_check |
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| 413 | ); |
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| 414 | login_failed = !start; |
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| 415 | } |
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| 416 | if (start) { |
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| 417 | rtems_telnetd_config.command( arg->devname, arg->arg); |
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| 418 | } |
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[b5bf8cd1] | 419 | |
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[8ad6681b] | 420 | stdin = ostd[0]; |
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| 421 | stdout = ostd[1]; |
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| 422 | stderr = ostd[2]; |
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[b5bf8cd1] | 423 | |
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[8a775c27] | 424 | if (login_failed) { |
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| 425 | syslog( |
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| 426 | LOG_AUTHPRIV | LOG_WARNING, |
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| 427 | "telnetd: to many wrong passwords entered from %s", |
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| 428 | arg->peername |
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| 429 | ); |
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| 430 | } |
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| 431 | |
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[b5bf8cd1] | 432 | cleanup: |
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[8ad6681b] | 433 | release_a_Connection(arg->devname, arg->peername, nstd, i); |
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| 434 | free(arg); |
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[b2712e3] | 435 | } |
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[b5bf8cd1] | 436 | |
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| 437 | struct wrap_delete_args { |
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[8ad6681b] | 438 | void (*t)(void *); |
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| 439 | void *a; |
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[b5bf8cd1] | 440 | }; |
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| 441 | |
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| 442 | static rtems_task |
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| 443 | wrap_delete(rtems_task_argument arg) |
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| 444 | { |
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[edcb982] | 445 | struct wrap_delete_args *pwa = (struct wrap_delete_args *)arg; |
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| 446 | register void (*t)(void *) = pwa->t; |
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| 447 | register void *a = pwa->a; |
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[b5bf8cd1] | 448 | |
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[8ad6681b] | 449 | /* free argument before calling function (which may never return if |
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| 450 | * they choose to delete themselves) |
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| 451 | */ |
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| 452 | free(pwa); |
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| 453 | t(a); |
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| 454 | rtems_task_delete(RTEMS_SELF); |
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[b5bf8cd1] | 455 | } |
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| 456 | |
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| 457 | void * |
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| 458 | telnetd_dflt_spawn(const char *name, unsigned int priority, unsigned int stackSize, void (*fn)(void *), void* fnarg) |
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| 459 | { |
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[edcb982] | 460 | rtems_status_code sc; |
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[8a775c27] | 461 | rtems_id task_id = RTEMS_ID_NONE; |
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[edcb982] | 462 | char nm[4] = {'X','X','X','X' }; |
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| 463 | struct wrap_delete_args *pwa = malloc(sizeof(*pwa)); |
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[b5bf8cd1] | 464 | |
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[edcb982] | 465 | strncpy(nm, name, 4); |
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[8ad6681b] | 466 | |
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[edcb982] | 467 | if ( !pwa ) { |
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| 468 | perror("Telnetd: no memory\n"); |
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[8a775c27] | 469 | return (void *) RTEMS_ID_NONE; |
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[edcb982] | 470 | } |
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[8ad6681b] | 471 | |
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[edcb982] | 472 | pwa->t = fn; |
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| 473 | pwa->a = fnarg; |
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| 474 | |
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| 475 | if ((sc=rtems_task_create( |
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| 476 | rtems_build_name(nm[0], nm[1], nm[2], nm[3]), |
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| 477 | (rtems_task_priority)priority, |
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| 478 | stackSize, |
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| 479 | RTEMS_DEFAULT_MODES, |
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| 480 | RTEMS_DEFAULT_ATTRIBUTES | RTEMS_FLOATING_POINT, |
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| 481 | &task_id)) || |
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| 482 | (sc=rtems_task_start( |
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| 483 | task_id, |
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| 484 | wrap_delete, |
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| 485 | (rtems_task_argument)pwa))) { |
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| 486 | free(pwa); |
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| 487 | rtems_error(sc,"Telnetd: spawning task failed"); |
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[8a775c27] | 488 | return (void *) RTEMS_ID_NONE; |
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[edcb982] | 489 | } |
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[8a775c27] | 490 | return (void *) task_id; |
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[b5bf8cd1] | 491 | } |
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| 492 | |
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| 493 | /* convenience routines for CEXP (retrieve stdio descriptors |
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| 494 | * from reent structure) |
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| 495 | */ |
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| 496 | #ifdef stdin |
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| 497 | static __inline__ FILE * |
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| 498 | _stdin(void) { return stdin; } |
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| 499 | #undef stdin |
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| 500 | FILE *stdin(void) { return _stdin(); } |
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| 501 | #endif |
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| 502 | #ifdef stdout |
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| 503 | static __inline__ FILE * |
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| 504 | _stdout(void) { return stdout; } |
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| 505 | #undef stdout |
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| 506 | FILE *stdout(void) { return _stdout(); } |
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| 507 | #endif |
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| 508 | #ifdef stderr |
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| 509 | static __inline__ FILE * |
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| 510 | _stderr(void) { return stderr; } |
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| 511 | #undef stderr |
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| 512 | FILE *stderr(void) { return _stderr(); } |
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| 513 | #endif |
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| 514 | |
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| 515 | /* MUST NOT USE stdin & friends below here !!!!!!!!!!!!! */ |
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