1 | /* |
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2 | * |
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3 | * Instantatiate a new terminal shell. |
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4 | * |
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5 | * Author: |
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6 | * |
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7 | * WORK: fernando.ruiz@ctv.es |
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8 | * HOME: correo@fernando-ruiz.com |
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9 | * |
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10 | * Thanks at: |
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11 | * Chris John |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | #ifdef HAVE_CONFIG_H |
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16 | #include "config.h" |
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17 | #endif |
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18 | |
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19 | #include <stdio.h> |
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20 | |
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21 | #include <rtems.h> |
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22 | #include <rtems/error.h> |
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23 | #include <rtems/libio.h> |
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24 | #include <rtems/libio_.h> |
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25 | #include <rtems/system.h> |
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26 | #include <rtems/shell.h> |
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27 | |
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28 | #include <termios.h> |
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29 | #include <string.h> |
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30 | #include <stdlib.h> |
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31 | #include <ctype.h> |
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32 | #include <unistd.h> |
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33 | #include <errno.h> |
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34 | #include <pwd.h> |
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35 | |
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36 | /* ----------------------------------------------- * |
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37 | * This is a stupidity but is cute. |
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38 | * ----------------------------------------------- */ |
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39 | rtems_unsigned32 new_rtems_name(char * rtems_name) { |
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40 | static char b[5]; |
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41 | sprintf(b,"%-4.4s",rtems_name); |
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42 | return rtems_build_name(b[0],b[1],b[2],b[3]); |
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43 | } |
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44 | /* ************************************************************** |
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45 | * common linked list of shell commands. |
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46 | * Because the help report is very long |
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47 | * I have a topic for each command. |
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48 | * Help list the topics |
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49 | * help [topic] list the commands for the topic |
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50 | * help [command] help for the command |
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51 | * Can you see help rtems monitor report? |
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52 | * ************************************************************** */ |
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53 | |
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54 | struct shell_topic_tt; |
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55 | typedef struct shell_topic_tt shell_topic_t; |
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56 | |
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57 | struct shell_topic_tt { |
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58 | char * topic; |
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59 | shell_topic_t * next; |
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60 | }; |
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61 | |
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62 | |
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63 | static shell_cmd_t * shell_first_cmd; |
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64 | static shell_topic_t * shell_first_topic; |
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65 | /* ----------------------------------------------- * |
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66 | * Using Chain I can reuse the rtems code. |
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67 | * I am more comfortable with this, sorry. |
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68 | * ----------------------------------------------- */ |
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69 | shell_topic_t * shell_lookup_topic(char * topic) { |
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70 | shell_topic_t * shell_topic; |
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71 | shell_topic=shell_first_topic; |
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72 | while (shell_topic) { |
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73 | if (!strcmp(shell_topic->topic,topic)) return shell_topic; |
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74 | shell_topic=shell_topic->next; |
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75 | }; |
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76 | return (shell_topic_t *) NULL; |
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77 | } |
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78 | /* ----------------------------------------------- */ |
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79 | shell_topic_t * shell_add_topic(char * topic) { |
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80 | shell_topic_t * current,*aux; |
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81 | if (!shell_first_topic) { |
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82 | aux=malloc(sizeof(shell_topic_t)); |
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83 | aux->topic=topic; |
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84 | aux->next=(shell_topic_t*)NULL; |
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85 | return shell_first_topic=aux; |
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86 | } else { |
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87 | current=shell_first_topic; |
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88 | if (!strcmp(topic,current->topic)) return current; |
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89 | while (current->next) { |
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90 | if (!strcmp(topic,current->next->topic)) return current->next; |
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91 | current=current->next; |
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92 | }; |
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93 | aux=malloc(sizeof(shell_topic_t)); |
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94 | aux->topic=topic; |
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95 | aux->next=(shell_topic_t*)NULL; |
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96 | current->next=aux; |
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97 | return aux; |
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98 | }; |
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99 | } |
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100 | /* ----------------------------------------------- */ |
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101 | shell_cmd_t * shell_lookup_cmd(char * cmd) { |
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102 | shell_cmd_t * shell_cmd; |
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103 | shell_cmd=shell_first_cmd; |
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104 | while (shell_cmd) { |
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105 | if (!strcmp(shell_cmd->name,cmd)) return shell_cmd; |
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106 | shell_cmd=shell_cmd->next; |
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107 | }; |
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108 | return (shell_cmd_t *) NULL; |
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109 | } |
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110 | /* ----------------------------------------------- */ |
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111 | shell_cmd_t * shell_add_cmd(char * cmd, |
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112 | char * topic, |
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113 | char * usage, |
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114 | shell_command_t command) { |
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115 | int shell_help(int argc,char * argv[]); |
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116 | shell_cmd_t * shell_cmd,*shell_pvt; |
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117 | if (!shell_first_cmd) { |
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118 | shell_first_cmd=(shell_cmd_t *) malloc(sizeof(shell_cmd_t)); |
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119 | shell_first_cmd->name ="help"; |
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120 | shell_first_cmd->topic ="help"; |
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121 | shell_first_cmd->usage ="help [topic] # list of usage of commands"; |
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122 | shell_first_cmd->command=shell_help; |
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123 | shell_first_cmd->alias =(shell_cmd_t *) NULL; |
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124 | shell_first_cmd->next =(shell_cmd_t *) NULL; |
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125 | shell_add_topic(shell_first_cmd->topic); |
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126 | register_cmds(); |
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127 | }; |
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128 | if (!cmd) return (shell_cmd_t *) NULL; |
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129 | if (!command) return (shell_cmd_t *) NULL; |
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130 | shell_cmd=(shell_cmd_t *) malloc(sizeof(shell_cmd_t)); |
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131 | shell_cmd->name =cmd; |
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132 | shell_cmd->topic =topic; |
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133 | shell_cmd->usage =usage; |
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134 | shell_cmd->command=command; |
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135 | shell_cmd->alias =(shell_cmd_t *) NULL; |
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136 | shell_cmd->next =(shell_cmd_t *) NULL; |
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137 | shell_add_topic(shell_cmd->topic); |
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138 | shell_pvt=shell_first_cmd; |
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139 | while (shell_pvt->next) shell_pvt=shell_pvt->next; |
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140 | return shell_pvt->next=shell_cmd; |
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141 | } |
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142 | /* ----------------------------------------------- * |
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143 | * you can make an alias for every command. |
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144 | * ----------------------------------------------- */ |
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145 | shell_cmd_t * shell_alias_cmd(char * cmd, char * alias) { |
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146 | shell_cmd_t * shell_cmd,* shell_aux; |
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147 | shell_aux=(shell_cmd_t *) NULL; |
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148 | if (alias) { |
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149 | if ((shell_aux=shell_lookup_cmd(alias))!=NULL) { |
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150 | return NULL; |
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151 | }; |
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152 | if ((shell_cmd=shell_lookup_cmd(cmd))!=NULL) { |
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153 | shell_aux=shell_add_cmd(alias,shell_cmd->topic, |
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154 | shell_cmd->usage,shell_cmd->command); |
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155 | if (shell_aux) shell_aux->alias=shell_cmd; |
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156 | }; |
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157 | }; |
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158 | return shell_aux; |
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159 | } |
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160 | /* ----------------------------------------------- * |
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161 | * Poor but enough.. |
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162 | * TODO: Redirection capture. "" evaluate, ... C&S welcome. |
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163 | * ----------------------------------------------- */ |
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164 | int shell_make_args(char * cmd, |
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165 | int * pargc, |
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166 | char * argv[]) { |
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167 | int argc=0; |
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168 | while ((cmd=strtok(cmd," \t\r\n"))!=NULL) { |
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169 | argv[argc++]=cmd; |
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170 | cmd=(char*)NULL; |
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171 | }; |
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172 | argv[argc]=(char*)NULL; |
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173 | return *pargc=argc; |
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174 | } |
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175 | /* ----------------------------------------------- * |
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176 | * show the help for one command. |
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177 | * ----------------------------------------------- */ |
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178 | int shell_help_cmd(shell_cmd_t * shell_cmd) { |
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179 | char * pc; |
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180 | int col,line; |
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181 | printf("%-10.10s -",shell_cmd->name); |
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182 | col=12; |
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183 | line=1; |
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184 | if (shell_cmd->alias) { |
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185 | printf("is an <alias> for command '%s'",shell_cmd->alias->name); |
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186 | } else |
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187 | if (shell_cmd->usage) { |
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188 | pc=shell_cmd->usage; |
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189 | while (*pc) { |
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190 | switch(*pc) { |
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191 | case '\r':break; |
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192 | case '\n':putchar('\n'); |
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193 | col=0; |
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194 | break; |
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195 | default :putchar(*pc); |
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196 | col++; |
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197 | break; |
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198 | }; |
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199 | pc++; |
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200 | if(col>78) { /* What daring... 78?*/ |
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201 | if (*pc) { |
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202 | putchar('\n'); |
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203 | col=0; |
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204 | }; |
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205 | }; |
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206 | if (!col && *pc) { |
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207 | printf(" "); |
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208 | col=12;line++; |
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209 | }; |
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210 | }; |
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211 | }; |
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212 | puts(""); |
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213 | return line; |
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214 | } |
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215 | /* ----------------------------------------------- * |
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216 | * show the help. The first command implemented. |
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217 | * Can you see the header of routine? Known? |
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218 | * The same with all the commands.... |
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219 | * ----------------------------------------------- */ |
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220 | int shell_help(int argc,char * argv[]) { |
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221 | int col,line,arg; |
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222 | shell_topic_t *topic; |
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223 | shell_cmd_t * shell_cmd=shell_first_cmd; |
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224 | if (argc<2) { |
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225 | printf("help: TOPIC? The topics are\n"); |
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226 | topic=shell_first_topic; |
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227 | col=0; |
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228 | while (topic) { |
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229 | if (!col){ |
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230 | col=printf(" %s",topic->topic); |
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231 | } else { |
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232 | if ((col+strlen(topic->topic)+2)>78){ |
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233 | printf("\n"); |
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234 | col=printf(" %s",topic->topic); |
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235 | } else { |
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236 | col+=printf(", %s",topic->topic); |
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237 | }; |
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238 | }; |
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239 | topic=topic->next; |
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240 | }; |
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241 | printf("\n"); |
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242 | return 1; |
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243 | }; |
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244 | line=0; |
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245 | for (arg=1;arg<argc;arg++) { |
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246 | if (line>16) { |
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247 | printf("Press any key to continue...");getchar(); |
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248 | printf("\n"); |
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249 | line=0; |
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250 | }; |
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251 | topic=shell_lookup_topic(argv[arg]); |
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252 | if (!topic){ |
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253 | if ((shell_cmd=shell_lookup_cmd(argv[arg]))==NULL) { |
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254 | printf("help: topic or cmd '%s' not found. Try <help> alone for a list\n",argv[arg]); |
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255 | line++; |
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256 | } else { |
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257 | line+=shell_help_cmd(shell_cmd); |
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258 | } |
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259 | continue; |
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260 | }; |
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261 | printf("help: list for the topic '%s'\n",argv[arg]); |
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262 | line++; |
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263 | while (shell_cmd) { |
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264 | if (!strcmp(topic->topic,shell_cmd->topic)) |
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265 | line+=shell_help_cmd(shell_cmd); |
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266 | if (line>16) { |
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267 | printf("Press any key to continue...");getchar(); |
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268 | printf("\n"); |
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269 | line=0; |
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270 | }; |
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271 | shell_cmd=shell_cmd->next; |
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272 | }; |
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273 | }; |
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274 | puts(""); |
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275 | return 0; |
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276 | } |
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277 | /* ----------------------------------------------- * |
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278 | * TODO:Change to bash readline() better. |
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279 | * ----------------------------------------------- */ |
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280 | int shell_scanline(char * line,int size,FILE * in,FILE * out) { |
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281 | int c,col; |
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282 | col=0; |
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283 | tcdrain(fileno(out)); |
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284 | for (;;) { |
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285 | line[col]=0; |
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286 | c=fgetc(in); |
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287 | switch (c) { |
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288 | case 0x04:/*Control-d*/ |
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289 | if (col) break; |
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290 | case EOF :return 0; |
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291 | case '\n':break; |
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292 | case '\f':if (out) fputc('\f',out); |
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293 | case 0x03:/*Control-C*/ |
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294 | line[0]=0; |
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295 | case '\r':if (out) fputc('\n',out); |
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296 | return 1; |
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297 | case 127: |
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298 | case '\b':if (col) { |
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299 | if (out) { |
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300 | fputc('\b',out); |
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301 | fputc(' ',out); |
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302 | fputc('\b',out); |
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303 | }; |
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304 | col--; |
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305 | } else { |
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306 | if (out) fputc('\a',out); |
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307 | }; |
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308 | break; |
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309 | default :if (!iscntrl(c)) { |
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310 | if (col<size-1) { |
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311 | line[col++]=c; |
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312 | if (out) fputc(c,out); |
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313 | } else { |
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314 | if (out) fputc('\a',out); |
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315 | }; |
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316 | } else { |
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317 | if (out) |
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318 | if (c=='\a') fputc('\a',out); |
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319 | }; |
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320 | break; |
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321 | }; |
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322 | }; |
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323 | } |
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324 | /* ----------------------------------------------- * |
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325 | * - The shell TASK |
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326 | * Poor but enough.. |
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327 | * TODO: Redirection. Tty Signals. ENVVARs. Shell language. |
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328 | * ----------------------------------------------- */ |
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329 | shell_env_t global_shell_env , |
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330 | * current_shell_env=&global_shell_env; |
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331 | |
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332 | extern char **environ; |
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333 | |
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334 | void cat_file(FILE * out,char * name) { |
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335 | FILE * fd; |
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336 | int c; |
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337 | if (out) { |
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338 | fd=fopen(name,"r"); |
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339 | if (fd) { |
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340 | while ((c=fgetc(fd))!=EOF) fputc(c,out); |
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341 | fclose(fd); |
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342 | }; |
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343 | }; |
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344 | } |
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345 | |
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346 | int shell_login(FILE * in,FILE * out) { |
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347 | FILE * fd; |
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348 | int c; |
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349 | time_t t; |
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350 | int times; |
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351 | char name[128]; |
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352 | char pass[128]; |
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353 | struct passwd * passwd; |
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354 | setuid(0); |
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355 | setgid(0); |
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356 | rtems_current_user_env->euid= |
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357 | rtems_current_user_env->egid=0; |
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358 | if (out) { |
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359 | if((current_shell_env->devname[5]!='p')|| |
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360 | (current_shell_env->devname[6]!='t')|| |
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361 | (current_shell_env->devname[7]!='y')) { |
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362 | cat_file(out,"/etc/issue"); |
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363 | } else { |
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364 | fd=fopen("/etc/issue.net","r"); |
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365 | if (fd) { |
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366 | while ((c=fgetc(fd))!=EOF) { |
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367 | if (c=='%') { |
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368 | switch(c=fgetc(fd)) { |
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369 | case 't':fprintf(out,"%s",current_shell_env->devname); |
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370 | break; |
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371 | case 'h':fprintf(out,"0"); |
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372 | break; |
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373 | case 'D':fprintf(out," "); |
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374 | break; |
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375 | case 'd':time(&t); |
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376 | fprintf(out,"%s",ctime(&t)); |
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377 | break; |
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378 | case 's':fprintf(out,"RTEMS"); |
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379 | break; |
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380 | case 'm':fprintf(out,"(" CPU_NAME "/" CPU_MODEL_NAME ")"); |
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381 | break; |
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382 | case 'r':fprintf(out,_RTEMS_version); |
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383 | break; |
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384 | case 'v':fprintf(out,"%s\n%s",_RTEMS_version,_Copyright_Notice); |
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385 | break; |
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386 | case '%':fprintf(out,"%%"); |
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387 | break; |
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388 | default :fprintf(out,"%%%c",c); |
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389 | break; |
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390 | }; |
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391 | } else { |
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392 | fputc(c,out); |
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393 | }; |
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394 | }; |
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395 | fclose(fd); |
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396 | } |
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397 | }; |
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398 | }; |
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399 | times=0; |
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400 | for (;;) { |
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401 | times++; |
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402 | if (times>3) break; |
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403 | if (out) fprintf(out,"\nlogin: "); |
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404 | if (!shell_scanline(name,sizeof(name),in,out )) break; |
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405 | if (out) fprintf(out,"Password: "); |
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406 | if (!shell_scanline(pass,sizeof(pass),in,NULL)) break; |
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407 | if (out) fprintf(out,"\n"); |
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408 | if ((passwd=getpwnam(name))) { |
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409 | setuid(passwd->pw_uid); |
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410 | setgid(passwd->pw_gid); |
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411 | rtems_current_user_env->euid= |
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412 | rtems_current_user_env->egid=0; |
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413 | chown(current_shell_env->devname,passwd->pw_uid,0); |
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414 | rtems_current_user_env->euid=passwd->pw_uid; |
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415 | rtems_current_user_env->egid=passwd->pw_gid; |
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416 | if (!strcmp(passwd->pw_passwd,"*")) { |
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417 | /* /etc/shadow */ |
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418 | return 0; |
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419 | } else { |
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420 | /* crypt() */ |
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421 | return 0; |
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422 | }; |
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423 | }; |
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424 | if (out) fprintf(out,"Login incorrect\n"); |
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425 | }; |
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426 | return -1; |
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427 | } |
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428 | |
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429 | rtems_task shell_shell(rtems_task_argument task_argument) { |
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430 | |
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431 | shell_env_t * shell_env =(shell_env_t*) task_argument; |
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432 | shell_cmd_t * shell_cmd; |
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433 | |
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434 | rtems_status_code sc; |
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435 | |
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436 | struct termios term; |
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437 | char * devname; |
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438 | |
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439 | char curdir[256]; |
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440 | char cmd[256]; |
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441 | char last_cmd[256]; /* to repeat 'r' */ |
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442 | int argc; |
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443 | char * argv[128]; |
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444 | |
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445 | sc=rtems_task_variable_add(RTEMS_SELF,(void*)¤t_shell_env,free); |
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446 | if (sc!=RTEMS_SUCCESSFUL) { |
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447 | rtems_error(sc,"rtems_task_variable_add(current_shell_env):"); |
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448 | rtems_task_delete(RTEMS_SELF); |
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449 | }; |
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450 | |
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451 | current_shell_env=shell_env; |
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452 | |
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453 | sc=rtems_libio_set_private_env(); |
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454 | if (sc!=RTEMS_SUCCESSFUL) { |
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455 | rtems_error(sc,"rtems_libio_set_private_env():"); |
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456 | rtems_task_delete(RTEMS_SELF); |
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457 | }; |
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458 | |
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459 | |
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460 | devname=shell_env->devname; |
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461 | setuid(0); |
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462 | setgid(0); |
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463 | rtems_current_user_env->euid= |
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464 | rtems_current_user_env->egid=0; |
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465 | |
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466 | stdin =fopen(devname,"r+"); |
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467 | |
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468 | if (!stdin) { |
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469 | fprintf(stderr,"shell:unable to open stdin.%s:%s\n",devname,strerror(errno)); |
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470 | rtems_task_delete(RTEMS_SELF); |
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471 | }; |
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472 | setvbuf(stdin,NULL,_IONBF,0); /* Not buffered*/ |
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473 | /* make a raw terminal,Linux MANuals */ |
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474 | if (tcgetattr (fileno(stdin), &term)>=0) { |
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475 | term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON); |
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476 | term.c_oflag &= ~OPOST; |
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477 | term.c_oflag |= (OPOST|ONLCR); /* But with cr+nl on output */ |
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478 | term.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); |
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479 | term.c_cflag = CLOCAL | CREAD |(shell_env->tcflag); |
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480 | term.c_cc[VMIN] = 1; |
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481 | term.c_cc[VTIME] = 0; |
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482 | if (tcsetattr (fileno(stdin), TCSADRAIN, &term) < 0) { |
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483 | fprintf(stderr,"shell:cannot set terminal attributes(%s)\n",devname); |
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484 | }; |
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485 | stdout=fopen(devname,"r+"); |
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486 | if (!stdout) { |
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487 | fprintf(stderr,"shell:unable to open stdout.%s:%s\n",devname,strerror(errno)); |
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488 | }; |
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489 | stderr=fopen(devname,"r+"); |
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490 | if (!stderr) { |
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491 | printf("shell:unable to open stderr.%s:%s\n",devname,strerror(errno)); |
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492 | }; |
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493 | /* when the future user environment runs ok |
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494 | * a freopen() reopens the terminals. Now this don't work |
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495 | * (sorry but you can't use because FILENO_STDIN!=0. Better fileno(stdin)) |
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496 | */ |
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497 | }; |
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498 | shell_add_cmd(NULL,NULL,NULL,NULL); /* init the chain list*/ |
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499 | do { |
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500 | if (!shell_login(stdin,stdout)) { |
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501 | cat_file(stdout,"/etc/motd"); |
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502 | strcpy(last_cmd,""); |
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503 | strcpy(cmd,""); |
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504 | printf("\n" |
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505 | "RTEMS SHELL (Version 1.0-FRC):%s. "__DATE__". 'help' to list commands.\n",devname); |
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506 | chdir("/"); |
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507 | shell_env->exit_shell=FALSE; |
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508 | for (;;) { |
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509 | /* Prompt section */ |
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510 | /* XXX: show_prompt user adjustable */ |
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511 | getcwd(curdir,sizeof(curdir)); |
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512 | printf("%s [%s] %c ",shell_env->taskname,curdir,geteuid()?'$':'#'); |
---|
513 | /* getcmd section */ |
---|
514 | if (!shell_scanline(cmd,sizeof(cmd),stdin,stdout)) break; /*EOF*/ |
---|
515 | /* evaluate cmd section */ |
---|
516 | if (!strcmp(cmd,"r")) { /* repeat last command, forced, not automatic */ |
---|
517 | strcpy(cmd,last_cmd); |
---|
518 | } else |
---|
519 | if (strcmp(cmd,"")) { /* only for get a new prompt */ |
---|
520 | strcpy(last_cmd,cmd); |
---|
521 | }; |
---|
522 | /* exec cmd section */ |
---|
523 | /* TODO: |
---|
524 | * To avoid user crash catch the signals. |
---|
525 | * Open a new stdio files with posibility of redirection * |
---|
526 | * Run in a new shell task background. (unix &) |
---|
527 | * Resuming. A little bash. |
---|
528 | */ |
---|
529 | if (shell_make_args(cmd,&argc,argv)) { |
---|
530 | if ((shell_cmd=shell_lookup_cmd(argv[0]))!=NULL) { |
---|
531 | shell_env->errorlevel=shell_cmd->command(argc,argv); |
---|
532 | } else { |
---|
533 | printf("shell:%s command not found\n",argv[0]); |
---|
534 | shell_env->errorlevel=-1; |
---|
535 | }; |
---|
536 | }; |
---|
537 | /* end exec cmd section */ |
---|
538 | if (shell_env->exit_shell) break; |
---|
539 | }; |
---|
540 | printf("\nGoodbye from RTEMS SHELL :-(\n"); |
---|
541 | }; |
---|
542 | } while (shell_env->forever); |
---|
543 | fclose(stdin ); |
---|
544 | fclose(stdout); |
---|
545 | fclose(stderr); |
---|
546 | rtems_task_delete(RTEMS_SELF); |
---|
547 | } |
---|
548 | /* ----------------------------------------------- */ |
---|
549 | rtems_status_code shell_init (char * task_name, |
---|
550 | rtems_unsigned32 task_stacksize, |
---|
551 | rtems_task_priority task_priority, |
---|
552 | char * devname, |
---|
553 | tcflag_t tcflag, |
---|
554 | int forever) { |
---|
555 | rtems_id task_id; |
---|
556 | rtems_status_code sc; |
---|
557 | shell_env_t * shell_env; |
---|
558 | sc=rtems_task_create(new_rtems_name(task_name), |
---|
559 | task_priority, |
---|
560 | task_stacksize?task_stacksize:RTEMS_MINIMUM_STACK_SIZE, |
---|
561 | RTEMS_DEFAULT_MODES, |
---|
562 | RTEMS_DEFAULT_ATTRIBUTES, |
---|
563 | &task_id); |
---|
564 | if (sc!=RTEMS_SUCCESSFUL) { |
---|
565 | rtems_error(sc,"creating task %s in shell_init()",task_name); |
---|
566 | return sc; |
---|
567 | }; |
---|
568 | shell_env=malloc(sizeof(shell_env_t)); |
---|
569 | if (!shell_env) { |
---|
570 | rtems_task_delete(task_id); |
---|
571 | sc=RTEMS_NO_MEMORY; |
---|
572 | rtems_error(sc,"allocating shell_env %s in shell_init()",task_name); |
---|
573 | return sc; |
---|
574 | }; |
---|
575 | if (global_shell_env.magic!=new_rtems_name("SENV")) { |
---|
576 | global_shell_env.magic =new_rtems_name("SENV"); |
---|
577 | global_shell_env.devname ="/dev/console"; |
---|
578 | global_shell_env.taskname ="GLOBAL"; |
---|
579 | global_shell_env.tcflag =0; |
---|
580 | global_shell_env.exit_shell=0; |
---|
581 | global_shell_env.forever =TRUE; |
---|
582 | }; |
---|
583 | shell_env->magic =global_shell_env.magic; |
---|
584 | shell_env->devname =devname; |
---|
585 | shell_env->taskname =task_name; |
---|
586 | shell_env->tcflag =tcflag; |
---|
587 | shell_env->exit_shell=FALSE; |
---|
588 | shell_env->forever =forever; |
---|
589 | return rtems_task_start(task_id,shell_shell,(rtems_task_argument) shell_env); |
---|
590 | } |
---|
591 | /* ----------------------------------------------- */ |
---|