1 | /* |
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2 | * Copyright (c) 2016 Chris Johns <chrisj@rtems.org>. All rights reserved. |
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3 | * |
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4 | * Redistribution and use in source and binary forms, with or without |
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5 | * modification, are permitted provided that the following conditions |
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6 | * are met: |
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7 | * 1. Redistributions of source code must retain the above copyright |
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8 | * notice, this list of conditions and the following disclaimer. |
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9 | * 2. Redistributions in binary form must reproduce the above copyright |
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10 | * notice, this list of conditions and the following disclaimer in the |
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11 | * documentation and/or other materials provided with the distribution. |
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12 | * |
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13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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23 | * SUCH DAMAGE. |
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24 | */ |
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25 | |
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26 | /* |
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27 | * Telnet service. To use add to rc.conf: |
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28 | * |
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29 | * telnetd_enable="YES" |
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30 | * telnet_options="-p 21 -s 32768 -P 8 -L" |
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31 | * |
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32 | * The options defaults are show. The options are: |
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33 | * |
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34 | * -C conns : Maximum connections (ptys). |
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35 | * -P priority : Telnet thread priority (RTEMS Classis API). |
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36 | * -L : Login using /etc/passwd |
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37 | */ |
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38 | |
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39 | #include <errno.h> |
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40 | #include <stddef.h> |
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41 | #include <stdio.h> |
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42 | #include <stdlib.h> |
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43 | #include <unistd.h> |
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44 | |
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45 | #define __need_getopt_newlib |
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46 | #include <getopt.h> |
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47 | |
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48 | #include <rtems/telnetd.h> |
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49 | #include <machine/rtems-bsd-rc-conf-services.h> |
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50 | |
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51 | /* |
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52 | * Stack size. Use RTEMS_BSD_CONFIG_TELNETD_STACK_SIZE. |
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53 | */ |
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54 | extern int rtems_telnetd_stack_size; |
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55 | __weak_reference(_rtems_telnetd_stack_size, rtems_telnetd_stack_size); |
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56 | int _rtems_telnetd_stack_size; |
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57 | |
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58 | /* |
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59 | * Condefs always defines this variable. |
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60 | */ |
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61 | extern int rtems_telnetd_maximum_ptys; |
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62 | |
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63 | /* |
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64 | * By default no login. |
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65 | */ |
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66 | static bool telnet_login; |
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67 | |
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68 | static void |
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69 | hydra_telnetd_command(char* device, void* arg) |
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70 | { |
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71 | rtems_shell_login_check_t login = NULL; |
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72 | rtems_shell_env_t shell_env; |
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73 | |
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74 | if (telnet_login) |
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75 | login = rtems_shell_login_check; |
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76 | |
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77 | rtems_shell_dup_current_env(&shell_env); |
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78 | |
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79 | shell_env.devname = device; |
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80 | shell_env.taskname = "TELn"; |
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81 | shell_env.exit_shell = false; |
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82 | shell_env.forever = 0; |
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83 | shell_env.echo = 0; |
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84 | shell_env.input = NULL; |
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85 | shell_env.output = NULL; |
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86 | shell_env.output_append = 0; |
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87 | shell_env.wake_on_end = 0; |
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88 | shell_env.login_check = login; |
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89 | |
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90 | rtems_shell_main_loop (&shell_env); |
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91 | } |
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92 | |
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93 | static int |
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94 | telnetd_service(rtems_bsd_rc_conf* rc_conf) |
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95 | { |
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96 | rtems_telnetd_config_table config = { |
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97 | .priority = 100, /* Telnet task priority */ |
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98 | .stack_size = 32 * 1024, /* Stack size */ |
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99 | .command = hydra_telnetd_command, /* The telnetd command, runs the shell. */ |
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100 | }; |
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101 | rtems_bsd_rc_conf_argc_argv* aa; |
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102 | int conns = 0; |
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103 | int r; |
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104 | |
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105 | if (rtems_telnetd_stack_size != 0) |
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106 | config.stack_size = rtems_telnetd_stack_size; |
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107 | |
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108 | aa = rtems_bsd_rc_conf_argc_argv_create(); |
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109 | if (aa == NULL) |
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110 | return -1; |
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111 | |
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112 | r = rtems_bsd_rc_conf_find(rc_conf, "telnetd_enable", aa); |
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113 | if (r == 0) { |
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114 | rtems_status_code sc; |
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115 | bool verbose = false; |
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116 | if (aa->argc == 2 && strcasecmp("YES", aa->argv[1]) == 0) { |
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117 | r = rtems_bsd_rc_conf_find(rc_conf, "telnetd_options", aa); |
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118 | if (r == 0) { |
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119 | struct getopt_data data; |
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120 | char* end; |
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121 | |
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122 | memset(&data, 0, sizeof(data)); |
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123 | |
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124 | while (true) { |
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125 | int c; |
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126 | |
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127 | c = getopt_r(aa->argc, aa->argv, "C:P:Lv", &data); |
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128 | if (c == -1) |
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129 | break; |
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130 | |
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131 | switch (c) { |
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132 | case 'C': |
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133 | conns = strtoul(data.optarg, &end, 10); |
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134 | if (conns == 0 || *end != '\0') { |
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135 | fprintf(stderr, "error: telnet: invalid connections countt\n"); |
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136 | } |
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137 | else { |
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138 | rtems_telnetd_maximum_ptys = conns; |
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139 | } |
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140 | break; |
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141 | case 'P': |
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142 | config.priority = strtoul(data.optarg, &end, 10); |
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143 | if (config.priority == 0 || *end != '\0') { |
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144 | fprintf(stderr, "error: telnetd: invalid priority\n"); |
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145 | config.priority = 100; |
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146 | } |
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147 | break; |
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148 | case 'L': |
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149 | telnet_login = true; |
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150 | break; |
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151 | case 'v': |
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152 | verbose = true; |
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153 | break; |
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154 | case '?': |
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155 | default: |
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156 | fprintf(stderr, "error: telnetd: unknown option: %s\n", data.optarg); |
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157 | break; |
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158 | } |
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159 | } |
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160 | } |
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161 | if (verbose) { |
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162 | printf("telnetd: conns:%lu pri:%lu login:%s\n", |
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163 | rtems_telnetd_maximum_ptys, config.priority, |
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164 | telnet_login == NULL ? "no" : "yes"); |
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165 | } |
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166 | sc = rtems_telnetd_start(&config); |
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167 | if (sc != RTEMS_SUCCESSFUL) |
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168 | fprintf(stderr, "error: telnetd: %s\n", rtems_status_text(sc)); |
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169 | } |
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170 | } |
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171 | |
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172 | return 0; |
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173 | } |
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174 | |
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175 | void |
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176 | rc_conf_telnetd_init(void* arg) |
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177 | { |
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178 | int r; |
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179 | r = rtems_bsd_rc_conf_service_add("telnetd", |
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180 | "after:network;before:ftpd;", |
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181 | telnetd_service); |
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182 | if (r < 0) |
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183 | fprintf(stderr, "error: telnetd service add failed: %s\n", strerror(errno)); |
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184 | } |
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