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