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