[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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| 8 | * WORK: fernando.ruiz@ctv.es |
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| 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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| 18 | * |
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| 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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| 26 | * This program is distributed in the hope that it will be useful, |
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| 27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 29 | * |
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| 30 | * $Id$ |
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[b2712e3] | 31 | */ |
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[b5bf8cd1] | 32 | |
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[bd520203] | 33 | #ifdef HAVE_CONFIG_H |
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| 34 | #include "config.h" |
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| 35 | #endif |
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[b2712e3] | 36 | |
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| 37 | #include <rtems.h> |
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| 38 | #include <rtems/error.h> |
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[bd520203] | 39 | #include <rtems/pty.h> |
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[b2712e3] | 40 | #include <rtems/shell.h> |
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| 41 | #include <rtems/telnetd.h> |
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[b5bf8cd1] | 42 | #include <rtems/bspIo.h> |
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[b2712e3] | 43 | #include <sys/socket.h> |
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| 44 | #include <netinet/in.h> |
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| 45 | #include <arpa/inet.h> |
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| 46 | #include <unistd.h> |
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| 47 | #include <stdlib.h> |
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| 48 | #include <stdio.h> |
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[b5bf8cd1] | 49 | #include <assert.h> |
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| 50 | #include <string.h> |
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| 51 | #include <syslog.h> |
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| 52 | |
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| 53 | #include <rtems/userenv.h> |
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| 54 | #include <rtems/error.h> |
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| 55 | #include <rtems/rtems_bsdnet.h> |
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| 56 | |
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| 57 | #define PARANOIA |
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| 58 | |
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| 59 | extern char *telnet_get_pty(int socket); |
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[c0cc985] | 60 | extern int telnet_pty_initialize(void); |
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[b5bf8cd1] | 61 | |
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| 62 | struct shell_args { |
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[edcb982] | 63 | char *devname; |
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| 64 | void *arg; |
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| 65 | char peername[16]; |
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| 66 | char delete_myself; |
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[b5bf8cd1] | 67 | }; |
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| 68 | |
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| 69 | typedef union uni_sa { |
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[edcb982] | 70 | struct sockaddr_in sin; |
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[8ad6681b] | 71 | struct sockaddr sa; |
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[b5bf8cd1] | 72 | } uni_sa; |
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| 73 | |
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| 74 | static int sockpeername(int sock, char *buf, int bufsz); |
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| 75 | |
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[c0cc985] | 76 | static int initialize_telnetd(void); |
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[edcb982] | 77 | static int telnetd_askForPassword; |
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[79061679] | 78 | |
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[edcb982] | 79 | void * telnetd_dflt_spawn( |
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| 80 | const char *name, |
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| 81 | unsigned priority, |
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| 82 | unsigned stackSize, |
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| 83 | void (*fn)(void*), |
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| 84 | void *fnarg |
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| 85 | ); |
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[79061679] | 86 | |
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[b2712e3] | 87 | /***********************************************************/ |
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[1fae7b43] | 88 | rtems_id telnetd_task_id = 0; |
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| 89 | uint32_t telnetd_stack_size = 32000; |
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| 90 | rtems_task_priority telnetd_task_priority = 0; |
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| 91 | bool telnetd_remain_on_caller_stdio = false; |
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| 92 | void (*telnetd_shell)(char *, void*) = 0; |
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| 93 | void *telnetd_shell_arg = NULL; |
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[edcb982] | 94 | void * (*telnetd_spawn_task)( |
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[1fae7b43] | 95 | const char *, |
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| 96 | unsigned, |
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| 97 | unsigned, |
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| 98 | void (*)(void*), |
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| 99 | void *) = telnetd_dflt_spawn; |
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| 100 | |
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| 101 | static char *grab_a_Connection( |
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| 102 | int des_socket, |
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| 103 | uni_sa *srv, |
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| 104 | char *peername, |
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| 105 | int sz |
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| 106 | ) |
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[b5bf8cd1] | 107 | { |
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[edcb982] | 108 | char *rval = 0; |
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[b5bf8cd1] | 109 | #if 0 |
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[edcb982] | 110 | socklen_t size_adr = sizeof(srv->sin); |
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[b5bf8cd1] | 111 | #else |
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[edcb982] | 112 | /* 4.6 doesn't have socklen_t */ |
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| 113 | uint32_t size_adr = sizeof(srv->sin); |
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[b5bf8cd1] | 114 | #endif |
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[edcb982] | 115 | int acp_sock; |
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[b5bf8cd1] | 116 | |
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[8ad6681b] | 117 | acp_sock = accept(des_socket,&srv->sa,&size_adr); |
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[b5bf8cd1] | 118 | |
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[8ad6681b] | 119 | if (acp_sock<0) { |
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| 120 | perror("telnetd:accept"); |
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| 121 | goto bailout; |
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| 122 | }; |
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[b5bf8cd1] | 123 | |
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[8ad6681b] | 124 | if ( !(rval=telnet_get_pty(acp_sock)) ) { |
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| 125 | syslog( LOG_DAEMON | LOG_ERR, "telnetd: unable to obtain PTY"); |
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| 126 | /* NOTE: failing 'do_get_pty()' closed the socket */ |
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| 127 | goto bailout; |
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| 128 | } |
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[b5bf8cd1] | 129 | |
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[8ad6681b] | 130 | if (sockpeername(acp_sock, peername, sz)) |
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| 131 | strncpy(peername, "<UNKNOWN>", sz); |
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[b5bf8cd1] | 132 | |
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| 133 | #ifdef PARANOIA |
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[8ad6681b] | 134 | syslog(LOG_DAEMON | LOG_INFO, |
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| 135 | "telnetd: accepted connection from %s on %s", |
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| 136 | peername, |
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| 137 | rval); |
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[b5bf8cd1] | 138 | #endif |
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| 139 | |
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| 140 | bailout: |
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| 141 | |
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[8ad6681b] | 142 | return rval; |
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[b5bf8cd1] | 143 | } |
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| 144 | |
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| 145 | |
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| 146 | static void release_a_Connection(char *devname, char *peername, FILE **pstd, int n) |
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| 147 | { |
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| 148 | |
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| 149 | #ifdef PARANOIA |
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[8ad6681b] | 150 | syslog( LOG_DAEMON | LOG_INFO, |
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| 151 | "telnetd: releasing connection from %s on %s", |
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| 152 | peername, |
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| 153 | devname ); |
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[b5bf8cd1] | 154 | #endif |
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| 155 | |
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[8ad6681b] | 156 | while (--n>=0) |
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| 157 | if (pstd[n]) fclose(pstd[n]); |
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[b5bf8cd1] | 158 | |
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| 159 | } |
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| 160 | |
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| 161 | static int sockpeername(int sock, char *buf, int bufsz) |
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| 162 | { |
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[edcb982] | 163 | uni_sa peer; |
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| 164 | int rval = sock < 0; |
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[b5bf8cd1] | 165 | #if 0 |
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[edcb982] | 166 | socklen_t len = sizeof(peer.sin); |
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[b5bf8cd1] | 167 | #else |
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[edcb982] | 168 | /* 4.6 doesn't have socklen_t */ |
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| 169 | uint32_t len = sizeof(peer.sin); |
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[b5bf8cd1] | 170 | #endif |
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| 171 | |
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[edcb982] | 172 | if ( !rval ) |
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[8ad6681b] | 173 | rval = getpeername(sock, &peer.sa, &len); |
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[b5bf8cd1] | 174 | |
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[8ad6681b] | 175 | if ( !rval ) |
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| 176 | rval = !inet_ntop( AF_INET, &peer.sin.sin_addr, buf, bufsz ); |
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[b5bf8cd1] | 177 | |
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[8ad6681b] | 178 | return rval; |
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[b5bf8cd1] | 179 | } |
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| 180 | |
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| 181 | #if 1 |
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| 182 | #define INSIDE_TELNETD |
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| 183 | #include "check_passwd.c" |
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| 184 | #else |
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| 185 | #define check_passwd(arg) 0 |
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| 186 | #endif |
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| 187 | |
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| 188 | |
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| 189 | static void |
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| 190 | spawned_shell(void *arg); |
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| 191 | |
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[b2712e3] | 192 | /***********************************************************/ |
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[b5bf8cd1] | 193 | static void |
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| 194 | rtems_task_telnetd(void *task_argument) |
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| 195 | { |
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[edcb982] | 196 | int des_socket; |
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| 197 | uni_sa srv; |
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| 198 | char *devname; |
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| 199 | char peername[16]; |
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| 200 | int i=1; |
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| 201 | int size_adr; |
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[1fae7b43] | 202 | struct shell_args *arg = NULL; |
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[b5bf8cd1] | 203 | |
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[8ad6681b] | 204 | if ((des_socket=socket(PF_INET,SOCK_STREAM,0))<0) { |
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| 205 | perror("telnetd:socket"); |
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| 206 | telnetd_task_id=0; |
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| 207 | rtems_task_delete(RTEMS_SELF); |
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| 208 | }; |
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| 209 | setsockopt(des_socket,SOL_SOCKET,SO_KEEPALIVE,&i,sizeof(i)); |
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| 210 | |
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| 211 | memset(&srv,0,sizeof(srv)); |
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| 212 | srv.sin.sin_family=AF_INET; |
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| 213 | srv.sin.sin_port=htons(23); |
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| 214 | size_adr=sizeof(srv.sin); |
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| 215 | if ((bind(des_socket,&srv.sa,size_adr))<0) { |
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| 216 | perror("telnetd:bind"); |
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[1fae7b43] | 217 | close(des_socket); |
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[8ad6681b] | 218 | telnetd_task_id=0; |
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| 219 | rtems_task_delete(RTEMS_SELF); |
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| 220 | }; |
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| 221 | if ((listen(des_socket,5))<0) { |
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| 222 | perror("telnetd:listen"); |
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| 223 | close(des_socket); |
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| 224 | telnetd_task_id=0; |
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| 225 | rtems_task_delete(RTEMS_SELF); |
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| 226 | }; |
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| 227 | |
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| 228 | /* we don't redirect stdio as this probably |
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| 229 | * was started from the console anyways.. |
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| 230 | */ |
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| 231 | do { |
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[1fae7b43] | 232 | if ( telnetd_remain_on_caller_stdio ) { |
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| 233 | char device_name[32]; |
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| 234 | ttyname_r( 1, device_name, sizeof(device_name) ); |
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| 235 | if ( !telnetd_askForPassword || (0 == check_passwd(arg->peername)) ) |
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| 236 | telnetd_shell(device_name, telnetd_shell_arg); |
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[8ad6681b] | 237 | } else { |
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[1fae7b43] | 238 | devname = grab_a_Connection(des_socket, &srv, peername, sizeof(peername)); |
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| 239 | |
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| 240 | if ( !devname ) { |
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| 241 | /* if something went wrong, sleep for some time */ |
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| 242 | sleep(10); |
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| 243 | continue; |
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| 244 | } |
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| 245 | |
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[edcb982] | 246 | arg = malloc( sizeof(*arg) ); |
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[8ad6681b] | 247 | |
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[edcb982] | 248 | arg->devname = devname; |
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| 249 | arg->arg = telnetd_shell_arg; |
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| 250 | strncpy(arg->peername, peername, sizeof(arg->peername)); |
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[8ad6681b] | 251 | |
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[edcb982] | 252 | if ( !telnetd_spawn_task( &devname[5], telnetd_task_priority, |
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| 253 | telnetd_stack_size, spawned_shell, arg) ) { |
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| 254 | FILE *dummy; |
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[8ad6681b] | 255 | |
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[edcb982] | 256 | if ( telnetd_spawn_task != telnetd_dflt_spawn ) { |
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| 257 | fprintf(stderr,"Telnetd: Unable to spawn child task\n"); |
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| 258 | } |
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[8ad6681b] | 259 | |
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[edcb982] | 260 | /* hmm - the pty driver slot can only be |
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| 261 | * released by opening and subsequently |
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| 262 | * closing the PTY - this also closes |
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| 263 | * the underlying socket. So we mock up |
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| 264 | * a stream... |
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| 265 | */ |
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[8ad6681b] | 266 | |
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[edcb982] | 267 | if ( !(dummy=fopen(devname,"r+")) ) |
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| 268 | perror("Unable to dummy open the pty, losing a slot :-("); |
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| 269 | release_a_Connection(devname, peername, &dummy, 1); |
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| 270 | free(arg); |
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| 271 | sleep(2); /* don't accept connections too fast */ |
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| 272 | } |
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[8ad6681b] | 273 | } |
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| 274 | } while(1); |
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[edcb982] | 275 | |
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[8ad6681b] | 276 | /* TODO: how to free the connection semaphore? But then - |
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| 277 | * stopping the daemon is probably only needed during |
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| 278 | * development/debugging. |
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| 279 | * Finalizer code should collect all the connection semaphore |
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| 280 | * counts and eventually clean up... |
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| 281 | */ |
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| 282 | close(des_socket); |
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| 283 | telnetd_task_id=0; |
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[b2712e3] | 284 | } |
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[edcb982] | 285 | |
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[b2712e3] | 286 | /***********************************************************/ |
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[b5bf8cd1] | 287 | static int initialize_telnetd(void) { |
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[8ad6681b] | 288 | |
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| 289 | if (telnetd_task_id ) return RTEMS_RESOURCE_IN_USE; |
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| 290 | if (telnetd_stack_size<=0 ) telnetd_stack_size =32000; |
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| 291 | |
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[edcb982] | 292 | if ( !telnetd_spawn_task("TNTD", telnetd_task_priority, |
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| 293 | RTEMS_MINIMUM_STACK_SIZE, rtems_task_telnetd, 0) ) { |
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| 294 | return -1; |
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[8ad6681b] | 295 | } |
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| 296 | return 0; |
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[b2712e3] | 297 | } |
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[b5bf8cd1] | 298 | |
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[b2712e3] | 299 | /***********************************************************/ |
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[8ad6681b] | 300 | int rtems_telnetd_initialize( |
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| 301 | void (*cmd)(char *, void *), |
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| 302 | void *arg, |
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[1fae7b43] | 303 | bool remainOnCallerSTDIO, |
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[8ad6681b] | 304 | size_t stack, |
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[edcb982] | 305 | rtems_task_priority priority, |
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[1fae7b43] | 306 | bool askForPassword |
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[8ad6681b] | 307 | ) |
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[b5bf8cd1] | 308 | { |
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[edcb982] | 309 | rtems_status_code sc; |
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[8ad6681b] | 310 | |
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| 311 | #if 0 |
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| 312 | printf("This is rtems-telnetd (modified by Till Straumann)\n"); |
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| 313 | printf("$Id$\n"); |
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| 314 | printf("Release $Name$\n"); |
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| 315 | #endif |
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| 316 | |
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| 317 | if ( !telnetd_shell && !cmd ) { |
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| 318 | fprintf(stderr,"startTelnetd(): setup error - NO SHELL; bailing out\n"); |
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| 319 | return 1; |
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| 320 | } |
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| 321 | |
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| 322 | if (telnetd_task_id) { |
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| 323 | fprintf(stderr,"ERROR:telnetd already started\n"); |
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| 324 | return 1; |
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| 325 | }; |
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| 326 | |
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| 327 | if ( !telnet_pty_initialize() ) { |
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| 328 | fprintf(stderr,"PTY driver probably not properly registered\n"); |
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| 329 | return 1; |
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| 330 | } |
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| 331 | |
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[edcb982] | 332 | telnetd_askForPassword = askForPassword; |
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| 333 | |
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[8ad6681b] | 334 | if (cmd) |
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| 335 | telnetd_shell = cmd; |
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| 336 | telnetd_shell_arg = arg; |
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| 337 | telnetd_stack_size = stack; |
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| 338 | if ( !priority ) { |
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| 339 | priority = rtems_bsdnet_config.network_task_priority; |
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| 340 | } |
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| 341 | if ( priority < 2 ) |
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[edcb982] | 342 | priority = 100; |
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[1fae7b43] | 343 | telnetd_task_priority = priority; |
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| 344 | telnetd_remain_on_caller_stdio = remainOnCallerSTDIO; |
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[8ad6681b] | 345 | |
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[edcb982] | 346 | sc = initialize_telnetd(); |
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| 347 | if (sc != RTEMS_SUCCESSFUL) return sc; |
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| 348 | |
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[1fae7b43] | 349 | if ( !telnetd_remain_on_caller_stdio ) |
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| 350 | fprintf(stderr, "rtems_telnetd() started with stacksize=%u,priority=%d\n", |
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| 351 | (unsigned)telnetd_stack_size,(int)telnetd_task_priority); |
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[8ad6681b] | 352 | return 0; |
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[b2712e3] | 353 | } |
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[b5bf8cd1] | 354 | |
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| 355 | /* utility wrapper */ |
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| 356 | static void |
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| 357 | spawned_shell(void *targ) |
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| 358 | { |
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[edcb982] | 359 | rtems_status_code sc; |
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| 360 | FILE *nstd[3]={0}; |
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| 361 | FILE *ostd[3]={ stdin, stdout, stderr }; |
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| 362 | int i=0; |
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| 363 | struct shell_args *arg = targ; |
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[b5bf8cd1] | 364 | |
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[8ad6681b] | 365 | sc=rtems_libio_set_private_env(); |
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[b5bf8cd1] | 366 | |
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[8ad6681b] | 367 | /* newlib hack/workaround. Before we change stdin/out/err we must make |
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[b5bf8cd1] | 368 | * sure the internal data are initialized (fileno(stdout) has this sideeffect). |
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[8ad6681b] | 369 | * This should probably be done from RTEMS' libc support layer... |
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| 370 | * (T.S., newlibc-1.13; 2005/10) |
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[b5bf8cd1] | 371 | */ |
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| 372 | |
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[8ad6681b] | 373 | fileno(stdout); |
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[b5bf8cd1] | 374 | |
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[8ad6681b] | 375 | if (RTEMS_SUCCESSFUL != sc) { |
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| 376 | rtems_error(sc,"rtems_libio_set_private_env"); |
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| 377 | goto cleanup; |
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| 378 | } |
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[b5bf8cd1] | 379 | |
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[8ad6681b] | 380 | /* redirect stdio */ |
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| 381 | for (i=0; i<3; i++) { |
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| 382 | if ( !(nstd[i]=fopen(arg->devname,"r+")) ) { |
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| 383 | perror("unable to open stdio"); |
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| 384 | goto cleanup; |
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| 385 | } |
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| 386 | } |
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[b5bf8cd1] | 387 | |
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[8ad6681b] | 388 | stdin = nstd[0]; |
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| 389 | stdout = nstd[1]; |
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| 390 | stderr = nstd[2]; |
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[b5bf8cd1] | 391 | |
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[edcb982] | 392 | #if 0 |
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| 393 | printk("STDOUT is now %x (%x) (FD %i/%i)\n", |
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| 394 | stdout,nstd[1],fileno(stdout),fileno(nstd[1])); |
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| 395 | printf("hello\n"); |
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| 396 | write(fileno(stdout),"hellofd\n",8); |
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| 397 | #endif |
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[b5bf8cd1] | 398 | |
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[8ad6681b] | 399 | /* call their routine */ |
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[edcb982] | 400 | if ( !telnetd_askForPassword || (0 == check_passwd(arg->peername)) ) |
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[8ad6681b] | 401 | telnetd_shell(arg->devname, arg->arg); |
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[b5bf8cd1] | 402 | |
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[8ad6681b] | 403 | stdin = ostd[0]; |
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| 404 | stdout = ostd[1]; |
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| 405 | stderr = ostd[2]; |
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[b5bf8cd1] | 406 | |
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| 407 | cleanup: |
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[8ad6681b] | 408 | release_a_Connection(arg->devname, arg->peername, nstd, i); |
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| 409 | free(arg); |
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[b2712e3] | 410 | } |
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[b5bf8cd1] | 411 | |
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| 412 | struct wrap_delete_args { |
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[8ad6681b] | 413 | void (*t)(void *); |
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| 414 | void *a; |
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[b5bf8cd1] | 415 | }; |
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| 416 | |
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| 417 | static rtems_task |
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| 418 | wrap_delete(rtems_task_argument arg) |
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| 419 | { |
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[edcb982] | 420 | struct wrap_delete_args *pwa = (struct wrap_delete_args *)arg; |
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| 421 | register void (*t)(void *) = pwa->t; |
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| 422 | register void *a = pwa->a; |
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[b5bf8cd1] | 423 | |
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[8ad6681b] | 424 | /* free argument before calling function (which may never return if |
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| 425 | * they choose to delete themselves) |
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| 426 | */ |
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| 427 | free(pwa); |
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| 428 | t(a); |
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| 429 | rtems_task_delete(RTEMS_SELF); |
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[b5bf8cd1] | 430 | } |
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| 431 | |
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| 432 | void * |
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| 433 | telnetd_dflt_spawn(const char *name, unsigned int priority, unsigned int stackSize, void (*fn)(void *), void* fnarg) |
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| 434 | { |
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[edcb982] | 435 | rtems_status_code sc; |
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| 436 | rtems_id task_id; |
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| 437 | char nm[4] = {'X','X','X','X' }; |
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| 438 | struct wrap_delete_args *pwa = malloc(sizeof(*pwa)); |
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[b5bf8cd1] | 439 | |
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[edcb982] | 440 | strncpy(nm, name, 4); |
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[8ad6681b] | 441 | |
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[edcb982] | 442 | if ( !pwa ) { |
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| 443 | perror("Telnetd: no memory\n"); |
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| 444 | return 0; |
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| 445 | } |
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[8ad6681b] | 446 | |
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[edcb982] | 447 | pwa->t = fn; |
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| 448 | pwa->a = fnarg; |
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| 449 | |
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| 450 | if ((sc=rtems_task_create( |
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| 451 | rtems_build_name(nm[0], nm[1], nm[2], nm[3]), |
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| 452 | (rtems_task_priority)priority, |
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| 453 | stackSize, |
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| 454 | RTEMS_DEFAULT_MODES, |
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| 455 | RTEMS_DEFAULT_ATTRIBUTES | RTEMS_FLOATING_POINT, |
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| 456 | &task_id)) || |
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| 457 | (sc=rtems_task_start( |
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| 458 | task_id, |
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| 459 | wrap_delete, |
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| 460 | (rtems_task_argument)pwa))) { |
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| 461 | free(pwa); |
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| 462 | rtems_error(sc,"Telnetd: spawning task failed"); |
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| 463 | return 0; |
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| 464 | } |
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[8ad6681b] | 465 | return (void*)task_id; |
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[b5bf8cd1] | 466 | } |
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| 467 | |
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| 468 | /* convenience routines for CEXP (retrieve stdio descriptors |
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| 469 | * from reent structure) |
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| 470 | */ |
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| 471 | #ifdef stdin |
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| 472 | static __inline__ FILE * |
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| 473 | _stdin(void) { return stdin; } |
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| 474 | #undef stdin |
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| 475 | FILE *stdin(void) { return _stdin(); } |
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| 476 | #endif |
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| 477 | #ifdef stdout |
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| 478 | static __inline__ FILE * |
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| 479 | _stdout(void) { return stdout; } |
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| 480 | #undef stdout |
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| 481 | FILE *stdout(void) { return _stdout(); } |
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| 482 | #endif |
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| 483 | #ifdef stderr |
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| 484 | static __inline__ FILE * |
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| 485 | _stderr(void) { return stderr; } |
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| 486 | #undef stderr |
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| 487 | FILE *stderr(void) { return _stderr(); } |
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| 488 | #endif |
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| 489 | |
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| 490 | /* MUST NOT USE stdin & friends below here !!!!!!!!!!!!! */ |
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