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 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 /* 31 * Loading modules, booting the system 32 */ 33 34 #include <stand.h> 35 #include <sys/reboot.h> 36 #include <sys/boot.h> 37 #include <string.h> 38 39 #include "bootstrap.h" 40 41 static int autoboot(int timeout, char *prompt); 42 static char *getbootfile(int try); 43 static int loadakernel(int try, int argc, char* argv[]); 44 45 /* List of kernel names to try (may be overwritten by boot.config) XXX should move from here? */ 46 static const char *default_bootfiles = "kernel"; 47 48 static int autoboot_tried; 49 50 /* 51 * The user wants us to boot. 52 */ 53 COMMAND_SET(boot, "boot", "boot a file or loaded kernel", command_boot); 54 55 static int 56 command_boot(int argc, char *argv[]) 57 { 58 struct preloaded_file *fp; 59 60 /* 61 * See if the user has specified an explicit kernel to boot. 62 */ 63 if ((argc > 1) && (argv[1][0] != '-')) { 64 65 /* XXX maybe we should discard everything and start again? */ 66 if (file_findfile(NULL, NULL) != NULL) { 67 snprintf(command_errbuf, sizeof(command_errbuf), 68 "can't boot '%s', kernel module already loaded", argv[1]); 69 return(CMD_ERROR); 70 } 71 72 /* find/load the kernel module */ 73 if (mod_loadkld(argv[1], argc - 2, argv + 2) != 0) 74 return(CMD_ERROR); 75 /* we have consumed all arguments */ 76 argc = 1; 77 } 78 79 /* 80 * See if there is a kernel module already loaded 81 */ 82 if (file_findfile(NULL, NULL) == NULL) 83 if (loadakernel(0, argc - 1, argv + 1)) 84 /* we have consumed all arguments */ 85 argc = 1; 86 87 /* 88 * Loaded anything yet? 89 */ 90 if ((fp = file_findfile(NULL, NULL)) == NULL) { 91 command_errmsg = "no bootable kernel"; 92 return(CMD_ERROR); 93 } 94 95 /* 96 * If we were given arguments, discard any previous. 97 * XXX should we merge arguments? Hard to DWIM. 98 */ 99 if (argc > 1) { 100 if (fp->f_args != NULL) 101 free(fp->f_args); 102 fp->f_args = unargv(argc - 1, argv + 1); 103 } 104 105 /* Hook for platform-specific autoloading of modules */ 106 if (archsw.arch_autoload() != 0) 107 return(CMD_ERROR); 108 109 /* Call the exec handler from the loader matching the kernel */ 110 file_formats[fp->f_loader]->l_exec(fp); 111 return(CMD_ERROR); 112 } 113 114 115 /* 116 * Autoboot after a delay 117 */ 118 119 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot); 120 121 static int 122 command_autoboot(int argc, char *argv[]) 123 { 124 int howlong; 125 char *cp, *prompt; 126 127 prompt = NULL; 128 howlong = -1; 129 switch(argc) { 130 case 3: 131 prompt = argv[2]; 132 /* FALLTHROUGH */ 133 case 2: 134 howlong = strtol(argv[1], &cp, 0); 135 if (*cp != 0) { 136 snprintf(command_errbuf, sizeof(command_errbuf), 137 "bad delay '%s'", argv[1]); 138 return(CMD_ERROR); 139 } 140 /* FALLTHROUGH */ 141 case 1: 142 return(autoboot(howlong, prompt)); 143 } 144 145 command_errmsg = "too many arguments"; 146 return(CMD_ERROR); 147 } 148 149 /* 150 * Called before we go interactive. If we think we can autoboot, and 151 * we haven't tried already, try now. 152 */ 153 void 154 autoboot_maybe() 155 { 156 char *cp; 157 158 cp = getenv("autoboot_delay"); 159 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO"))) 160 autoboot(-1, NULL); /* try to boot automatically */ 161 } 162 163 int 164 bootenv_flags() 165 { 166 int i, howto; 167 char *val; 168 169 for (howto = 0, i = 0; howto_names[i].ev != NULL; i++) { 170 val = getenv(howto_names[i].ev); 171 if (val != NULL && strcasecmp(val, "no") != 0) 172 howto |= howto_names[i].mask; 173 } 174 return (howto); 175 } 176 177 void 178 bootenv_set(int howto) 179 { 180 int i; 181 182 for (i = 0; howto_names[i].ev != NULL; i++) 183 if (howto & howto_names[i].mask) 184 setenv(howto_names[i].ev, "YES", 1); 185 } 186 187 static int 188 autoboot(int timeout, char *prompt) 189 { 190 time_t when, otime, ntime; 191 int c, yes; 192 char *argv[2], *cp, *ep; 193 char *kernelname; 194 #ifdef BOOT_PROMPT_123 195 const char *seq = "123", *p = seq; 196 #endif 197 198 autoboot_tried = 1; 199 200 if (timeout == -1) { 201 timeout = 10; 202 /* try to get a delay from the environment */ 203 if ((cp = getenv("autoboot_delay"))) { 204 timeout = strtol(cp, &ep, 0); 205 if (cp == ep) 206 timeout = 10; /* Unparseable? Set default! */ 207 } 208 } 209 210 kernelname = getenv("kernelname"); 211 if (kernelname == NULL) { 212 argv[0] = NULL; 213 loadakernel(0, 0, argv); 214 kernelname = getenv("kernelname"); 215 if (kernelname == NULL) { 216 command_errmsg = "no valid kernel found"; 217 return(CMD_ERROR); 218 } 219 } 220 221 if (timeout >= 0) { 222 otime = time(NULL); 223 when = otime + timeout; /* when to boot */ 224 225 yes = 0; 226 227 #ifdef BOOT_PROMPT_123 228 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or " 229 "1 2 3 sequence for command prompt." : prompt); 230 #else 231 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt); 232 #endif 233 234 for (;;) { 235 if (ischar()) { 236 c = getchar(); 237 #ifdef BOOT_PROMPT_123 238 if ((c == '\r') || (c == '\n')) { 239 yes = 1; 240 break; 241 } else if (c != *p++) 242 p = seq; 243 if (*p == 0) 244 break; 245 #else 246 if ((c == '\r') || (c == '\n')) 247 yes = 1; 248 break; 249 #endif 250 } 251 ntime = time(NULL); 252 if (ntime >= when) { 253 yes = 1; 254 break; 255 } 256 257 if (ntime != otime) { 258 printf("\rBooting [%s] in %d second%s... ", 259 kernelname, (int)(when - ntime), 260 (when-ntime)==1?"":"s"); 261 otime = ntime; 262 } 263 } 264 } else { 265 yes = 1; 266 } 267 268 if (yes) 269 printf("\rBooting [%s]... ", kernelname); 270 putchar('\n'); 271 if (yes) { 272 argv[0] = "boot"; 273 argv[1] = NULL; 274 return(command_boot(1, argv)); 275 } 276 return(CMD_OK); 277 } 278 279 /* 280 * Scrounge for the name of the (try)'th file we will try to boot. 281 */ 282 static char * 283 getbootfile(int try) 284 { 285 static char *name = NULL; 286 const char *spec, *ep; 287 size_t len; 288 289 /* we use dynamic storage */ 290 if (name != NULL) { 291 free(name); 292 name = NULL; 293 } 294 295 /* 296 * Try $bootfile, then try our builtin default 297 */ 298 if ((spec = getenv("bootfile")) == NULL) 299 spec = default_bootfiles; 300 301 while ((try > 0) && (spec != NULL)) { 302 spec = strchr(spec, ';'); 303 if (spec) 304 spec++; /* skip over the leading ';' */ 305 try--; 306 } 307 if (spec != NULL) { 308 if ((ep = strchr(spec, ';')) != NULL) { 309 len = ep - spec; 310 } else { 311 len = strlen(spec); 312 } 313 name = malloc(len + 1); 314 strncpy(name, spec, len); 315 name[len] = 0; 316 } 317 if (name && name[0] == 0) { 318 free(name); 319 name = NULL; 320 } 321 return(name); 322 } 323 324 /* 325 * Try to find the /etc/fstab file on the filesystem (rootdev), 326 * which should be be the root filesystem, and parse it to find 327 * out what the kernel ought to think the root filesystem is. 328 * 329 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path> 330 * so that the kernel can tell both which VFS and which node to use 331 * to mount the device. If this variable's already set, don't 332 * overwrite it. 333 */ 334 int 335 getrootmount(char *rootdev) 336 { 337 char lbuf[128], *cp, *ep, *dev, *fstyp, *options; 338 int fd, error; 339 340 if (getenv("vfs.root.mountfrom") != NULL) 341 return(0); 342 343 error = 1; 344 sprintf(lbuf, "%s/etc/fstab", rootdev); 345 if ((fd = open(lbuf, O_RDONLY)) < 0) 346 goto notfound; 347 348 /* loop reading lines from /etc/fstab What was that about sscanf again? */ 349 fstyp = NULL; 350 dev = NULL; 351 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) { 352 if ((lbuf[0] == 0) || (lbuf[0] == '#')) 353 continue; 354 355 /* skip device name */ 356 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++) 357 ; 358 if (*cp == 0) /* misformatted */ 359 continue; 360 /* delimit and save */ 361 *cp++ = 0; 362 free(dev); 363 dev = strdup(lbuf); 364 365 /* skip whitespace up to mountpoint */ 366 while ((*cp != 0) && isspace(*cp)) 367 cp++; 368 /* must have /<space> to be root */ 369 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1))) 370 continue; 371 /* skip whitespace up to fstype */ 372 cp += 2; 373 while ((*cp != 0) && isspace(*cp)) 374 cp++; 375 if (*cp == 0) /* misformatted */ 376 continue; 377 /* skip text to end of fstype and delimit */ 378 ep = cp; 379 while ((*cp != 0) && !isspace(*cp)) 380 cp++; 381 *cp = 0; 382 free(fstyp); 383 fstyp = strdup(ep); 384 385 /* skip whitespace up to mount options */ 386 cp += 1; 387 while ((*cp != 0) && isspace(*cp)) 388 cp++; 389 if (*cp == 0) /* misformatted */ 390 continue; 391 /* skip text to end of mount options and delimit */ 392 ep = cp; 393 while ((*cp != 0) && !isspace(*cp)) 394 cp++; 395 *cp = 0; 396 options = strdup(ep); 397 /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */ 398 sprintf(lbuf, "%s:%s", fstyp, dev); 399 setenv("vfs.root.mountfrom", lbuf, 0); 400 401 /* Don't override vfs.root.mountfrom.options if it is already set */ 402 if (getenv("vfs.root.mountfrom.options") == NULL) { 403 /* save mount options */ 404 setenv("vfs.root.mountfrom.options", options, 0); 405 } 406 free(options); 407 error = 0; 408 break; 409 } 410 close(fd); 411 free(dev); 412 free(fstyp); 413 414 notfound: 415 if (error) { 416 const char *currdev; 417 418 currdev = getenv("currdev"); 419 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) { 420 cp = strdup(currdev); 421 cp[strlen(cp) - 1] = '\0'; 422 setenv("vfs.root.mountfrom", cp, 0); 423 error = 0; 424 free(cp); 425 } 426 } 427 428 return(error); 429 } 430 431 static int 432 loadakernel(int try, int argc, char* argv[]) 433 { 434 char *cp; 435 436 for (try = 0; (cp = getbootfile(try)) != NULL; try++) 437 if (mod_loadkld(cp, argc - 1, argv + 1) != 0) 438 printf("can't load '%s'\n", cp); 439 else 440 return 1; 441 return 0; 442 } 443