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 #ifdef LOADER_VERIEXEC 110 verify_pcr_export(); /* for measured boot */ 111 #ifdef LOADER_VERIEXEC_PASS_MANIFEST 112 pass_manifest_export_envs(); 113 #endif 114 #endif 115 116 /* Call the exec handler from the loader matching the kernel */ 117 file_formats[fp->f_loader]->l_exec(fp); 118 return(CMD_ERROR); 119 } 120 121 122 /* 123 * Autoboot after a delay 124 */ 125 126 COMMAND_SET(autoboot, "autoboot", "boot automatically after a delay", command_autoboot); 127 128 static int 129 command_autoboot(int argc, char *argv[]) 130 { 131 int howlong; 132 char *cp, *prompt; 133 134 prompt = NULL; 135 howlong = -1; 136 switch(argc) { 137 case 3: 138 prompt = argv[2]; 139 /* FALLTHROUGH */ 140 case 2: 141 howlong = strtol(argv[1], &cp, 0); 142 if (*cp != 0) { 143 snprintf(command_errbuf, sizeof(command_errbuf), 144 "bad delay '%s'", argv[1]); 145 return(CMD_ERROR); 146 } 147 /* FALLTHROUGH */ 148 case 1: 149 return(autoboot(howlong, prompt)); 150 } 151 152 command_errmsg = "too many arguments"; 153 return(CMD_ERROR); 154 } 155 156 /* 157 * Called before we go interactive. If we think we can autoboot, and 158 * we haven't tried already, try now. 159 */ 160 void 161 autoboot_maybe() 162 { 163 char *cp; 164 165 cp = getenv("autoboot_delay"); 166 if ((autoboot_tried == 0) && ((cp == NULL) || strcasecmp(cp, "NO"))) 167 autoboot(-1, NULL); /* try to boot automatically */ 168 } 169 170 static int 171 autoboot(int timeout, char *prompt) 172 { 173 time_t when, otime, ntime; 174 int c, yes; 175 char *argv[2], *cp, *ep; 176 char *kernelname; 177 #ifdef BOOT_PROMPT_123 178 const char *seq = "123", *p = seq; 179 #endif 180 181 autoboot_tried = 1; 182 183 if (timeout == -1) { 184 timeout = 10; 185 /* try to get a delay from the environment */ 186 if ((cp = getenv("autoboot_delay"))) { 187 timeout = strtol(cp, &ep, 0); 188 if (cp == ep) 189 timeout = 10; /* Unparseable? Set default! */ 190 } 191 } 192 193 kernelname = getenv("kernelname"); 194 if (kernelname == NULL) { 195 argv[0] = NULL; 196 loadakernel(0, 0, argv); 197 kernelname = getenv("kernelname"); 198 if (kernelname == NULL) { 199 command_errmsg = "no valid kernel found"; 200 return(CMD_ERROR); 201 } 202 } 203 204 if (timeout >= 0) { 205 otime = time(NULL); 206 when = otime + timeout; /* when to boot */ 207 208 yes = 0; 209 210 #ifdef BOOT_PROMPT_123 211 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or " 212 "1 2 3 sequence for command prompt." : prompt); 213 #else 214 printf("%s\n", (prompt == NULL) ? "Hit [Enter] to boot immediately, or any other key for command prompt." : prompt); 215 #endif 216 217 for (;;) { 218 if (ischar()) { 219 c = getchar(); 220 #ifdef BOOT_PROMPT_123 221 if ((c == '\r') || (c == '\n')) { 222 yes = 1; 223 break; 224 } else if (c != *p++) 225 p = seq; 226 if (*p == 0) 227 break; 228 #else 229 if ((c == '\r') || (c == '\n')) 230 yes = 1; 231 break; 232 #endif 233 } 234 ntime = time(NULL); 235 if (ntime >= when) { 236 yes = 1; 237 break; 238 } 239 240 if (ntime != otime) { 241 printf("\rBooting [%s] in %d second%s... ", 242 kernelname, (int)(when - ntime), 243 (when-ntime)==1?"":"s"); 244 otime = ntime; 245 } 246 } 247 } else { 248 yes = 1; 249 } 250 251 if (yes) 252 printf("\rBooting [%s]... ", kernelname); 253 putchar('\n'); 254 if (yes) { 255 argv[0] = "boot"; 256 argv[1] = NULL; 257 return(command_boot(1, argv)); 258 } 259 return(CMD_OK); 260 } 261 262 /* 263 * Scrounge for the name of the (try)'th file we will try to boot. 264 */ 265 static char * 266 getbootfile(int try) 267 { 268 static char *name = NULL; 269 const char *spec, *ep; 270 size_t len; 271 272 /* we use dynamic storage */ 273 if (name != NULL) { 274 free(name); 275 name = NULL; 276 } 277 278 /* 279 * Try $bootfile, then try our builtin default 280 */ 281 if ((spec = getenv("bootfile")) == NULL) 282 spec = default_bootfiles; 283 284 while ((try > 0) && (spec != NULL)) { 285 spec = strchr(spec, ';'); 286 if (spec) 287 spec++; /* skip over the leading ';' */ 288 try--; 289 } 290 if (spec != NULL) { 291 if ((ep = strchr(spec, ';')) != NULL) { 292 len = ep - spec; 293 } else { 294 len = strlen(spec); 295 } 296 name = malloc(len + 1); 297 strncpy(name, spec, len); 298 name[len] = 0; 299 } 300 if (name && name[0] == 0) { 301 free(name); 302 name = NULL; 303 } 304 return(name); 305 } 306 307 /* 308 * Try to find the /etc/fstab file on the filesystem (rootdev), 309 * which should be be the root filesystem, and parse it to find 310 * out what the kernel ought to think the root filesystem is. 311 * 312 * If we're successful, set vfs.root.mountfrom to <vfstype>:<path> 313 * so that the kernel can tell both which VFS and which node to use 314 * to mount the device. If this variable's already set, don't 315 * overwrite it. 316 */ 317 int 318 getrootmount(char *rootdev) 319 { 320 char lbuf[128], *cp, *ep, *dev, *fstyp, *options; 321 int fd, error; 322 323 if (getenv("vfs.root.mountfrom") != NULL) 324 return(0); 325 326 error = 1; 327 sprintf(lbuf, "%s/etc/fstab", rootdev); 328 if ((fd = open(lbuf, O_RDONLY)) < 0) 329 goto notfound; 330 331 /* loop reading lines from /etc/fstab What was that about sscanf again? */ 332 fstyp = NULL; 333 dev = NULL; 334 while (fgetstr(lbuf, sizeof(lbuf), fd) >= 0) { 335 if ((lbuf[0] == 0) || (lbuf[0] == '#')) 336 continue; 337 338 /* skip device name */ 339 for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++) 340 ; 341 if (*cp == 0) /* misformatted */ 342 continue; 343 /* delimit and save */ 344 *cp++ = 0; 345 free(dev); 346 dev = strdup(lbuf); 347 348 /* skip whitespace up to mountpoint */ 349 while ((*cp != 0) && isspace(*cp)) 350 cp++; 351 /* must have /<space> to be root */ 352 if ((*cp == 0) || (*cp != '/') || !isspace(*(cp + 1))) 353 continue; 354 /* skip whitespace up to fstype */ 355 cp += 2; 356 while ((*cp != 0) && isspace(*cp)) 357 cp++; 358 if (*cp == 0) /* misformatted */ 359 continue; 360 /* skip text to end of fstype and delimit */ 361 ep = cp; 362 while ((*cp != 0) && !isspace(*cp)) 363 cp++; 364 *cp = 0; 365 free(fstyp); 366 fstyp = strdup(ep); 367 368 /* skip whitespace up to mount options */ 369 cp += 1; 370 while ((*cp != 0) && isspace(*cp)) 371 cp++; 372 if (*cp == 0) /* misformatted */ 373 continue; 374 /* skip text to end of mount options and delimit */ 375 ep = cp; 376 while ((*cp != 0) && !isspace(*cp)) 377 cp++; 378 *cp = 0; 379 options = strdup(ep); 380 /* Build the <fstype>:<device> and save it in vfs.root.mountfrom */ 381 sprintf(lbuf, "%s:%s", fstyp, dev); 382 setenv("vfs.root.mountfrom", lbuf, 0); 383 384 /* Don't override vfs.root.mountfrom.options if it is already set */ 385 if (getenv("vfs.root.mountfrom.options") == NULL) { 386 /* save mount options */ 387 setenv("vfs.root.mountfrom.options", options, 0); 388 } 389 free(options); 390 error = 0; 391 break; 392 } 393 close(fd); 394 free(dev); 395 free(fstyp); 396 397 notfound: 398 if (error) { 399 const char *currdev; 400 401 currdev = getenv("currdev"); 402 if (currdev != NULL && strncmp("zfs:", currdev, 4) == 0) { 403 cp = strdup(currdev); 404 cp[strlen(cp) - 1] = '\0'; 405 setenv("vfs.root.mountfrom", cp, 0); 406 error = 0; 407 free(cp); 408 } 409 } 410 411 return(error); 412 } 413 414 static int 415 loadakernel(int try, int argc, char* argv[]) 416 { 417 char *cp; 418 419 for (try = 0; (cp = getbootfile(try)) != NULL; try++) 420 if (mod_loadkld(cp, argc - 1, argv + 1) != 0) 421 printf("can't load '%s'\n", cp); 422 else 423 return 1; 424 return 0; 425 } 426