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