1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 /* 28 * Simple commandline interpreter, toplevel and misc. 29 * 30 * XXX may be obsoleted by BootFORTH or some other, better, interpreter. 31 */ 32 33 #include <stand.h> 34 #include <string.h> 35 #include "bootstrap.h" 36 37 #ifdef LOADER_VERIEXEC 38 #include <verify_file.h> 39 #endif 40 41 #define MAXARGS 20 /* maximum number of arguments allowed */ 42 43 const char * volatile interp_identifier; 44 45 /* 46 * Interactive mode 47 */ 48 void 49 interact(void) 50 { 51 static char input[256]; /* big enough? */ 52 53 TSENTER(); 54 55 /* 56 * Because interp_identifier is volatile, it cannot be optimized out by 57 * the compiler as it's considered an externally observable event. This 58 * prevents the compiler from optimizing out our carefully placed 59 * $Interpreter:4th string that userboot may use to determine that 60 * we need to switch interpreters. 61 */ 62 interp_identifier = bootprog_interp; 63 interp_preinit(); 64 interp_init(); 65 66 printf("\n"); 67 68 /* 69 * Before interacting, we might want to autoboot. 70 */ 71 autoboot_maybe(); 72 73 /* 74 * Not autobooting, go manual 75 */ 76 printf("\nType '?' for a list of commands, 'help' for more detailed help.\n"); 77 if (getenv("prompt") == NULL) 78 setenv("prompt", "${interpret}", 1); 79 if (getenv("interpret") == NULL) 80 setenv("interpret", "OK", 1); 81 82 for (;;) { 83 input[0] = '\0'; 84 interp_emit_prompt(); 85 ngets(input, sizeof(input)); 86 #ifdef LOADER_VERIEXEC 87 /* some settings should be restritcted */ 88 ve_status_set(-1, VE_UNVERIFIED_OK); 89 #endif 90 interp_run(input); 91 } 92 } 93 94 /* 95 * Read commands from a file, then execute them. 96 * 97 * We store the commands in memory and close the source file so that the media 98 * holding it can safely go away while we are executing. 99 * 100 * Commands may be prefixed with '@' (so they aren't displayed) or '-' (so 101 * that the script won't stop if they fail). 102 */ 103 COMMAND_SET(include, "include", "read commands from a file", command_include); 104 105 static int 106 command_include(int argc, char *argv[]) 107 { 108 int i; 109 int res; 110 char **argvbuf; 111 112 /* 113 * Since argv is static, we need to save it here. 114 */ 115 argvbuf = (char**) calloc((u_int)argc, sizeof(char*)); 116 for (i = 0; i < argc; i++) 117 argvbuf[i] = strdup(argv[i]); 118 119 res=CMD_OK; 120 for (i = 1; (i < argc) && (res == CMD_OK); i++) 121 res = interp_include(argvbuf[i]); 122 123 for (i = 0; i < argc; i++) 124 free(argvbuf[i]); 125 free(argvbuf); 126 127 return(res); 128 } 129 130 /* 131 * Emit the current prompt; use the same syntax as the parser 132 * for embedding environment variables. Does not accept input. 133 */ 134 void 135 interp_emit_prompt(void) 136 { 137 char *pr, *p, *cp, *ev; 138 139 if ((cp = getenv("prompt")) == NULL) 140 cp = ">"; 141 pr = p = strdup(cp); 142 143 while (*p != 0) { 144 if ((*p == '$') && (*(p+1) == '{')) { 145 for (cp = p + 2; (*cp != 0) && (*cp != '}'); cp++) 146 ; 147 *cp = 0; 148 ev = getenv(p + 2); 149 150 if (ev != NULL) 151 printf("%s", ev); 152 p = cp + 1; 153 continue; 154 } 155 putchar(*p++); 156 } 157 putchar(' '); 158 free(pr); 159 } 160 161 static struct bootblk_command * 162 interp_lookup_cmd(const char *cmd) 163 { 164 struct bootblk_command **cmdp; 165 166 /* search the command set for the command */ 167 SET_FOREACH(cmdp, Xcommand_set) { 168 if (((*cmdp)->c_name != NULL) && !strcmp(cmd, (*cmdp)->c_name)) 169 return (*cmdp); 170 } 171 return (NULL); 172 } 173 174 /* 175 * Perform a builtin command 176 */ 177 int 178 interp_builtin_cmd(int argc, char *argv[]) 179 { 180 int result; 181 struct bootblk_command *cmd; 182 183 if (argc < 1) 184 return (CMD_OK); 185 186 /* set return defaults; a successful command will override these */ 187 command_errmsg = command_errbuf; 188 strcpy(command_errbuf, "no error message"); 189 result = CMD_ERROR; 190 191 cmd = interp_lookup_cmd(argv[0]); 192 if (cmd != NULL && cmd->c_fn) { 193 result = cmd->c_fn(argc, argv); 194 } else { 195 command_errmsg = "unknown command"; 196 } 197 return (result); 198 } 199 200 /* 201 * Return true if the builtin command exists 202 */ 203 bool 204 interp_has_builtin_cmd(const char *cmd) 205 { 206 return (interp_lookup_cmd(cmd) != NULL); 207 } 208