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