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