1 /* $OpenBSD: boot.c,v 1.43 2014/02/19 22:02:15 miod Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Dale Rahn 5 * Copyright (c) 1997,1998 Michael Shalayeff 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31 #include <sys/param.h> 32 #include <sys/reboot.h> 33 #include <sys/stat.h> 34 #include <libsa.h> 35 #include <lib/libsa/loadfile.h> 36 #include <lib/libkern/funcs.h> 37 38 #include <stand/boot/bootarg.h> 39 40 #include "cmd.h" 41 42 #ifndef KERNEL 43 #define KERNEL "/bsd" 44 #endif 45 46 char prog_ident[40]; 47 char *progname = "BOOT"; 48 49 extern const char version[]; 50 struct cmd_state cmd; 51 52 /* bootprompt can be set by MD code to avoid prompt first time round */ 53 int bootprompt = 1; 54 char *kernelfile = KERNEL; /* can be changed by MD code */ 55 int boottimeout = 5; /* can be changed by MD code */ 56 57 char rnddata[BOOTRANDOM_MAX]; 58 59 void 60 boot(dev_t bootdev) 61 { 62 int fd; 63 int try = 0, st; 64 u_long marks[MARK_MAX]; 65 66 machdep(); 67 68 snprintf(prog_ident, sizeof(prog_ident), 69 ">> OpenBSD/" MACHINE " %s %s", progname, version); 70 printf("%s\n", prog_ident); 71 72 devboot(bootdev, cmd.bootdev); 73 strlcpy(cmd.image, kernelfile, sizeof(cmd.image)); 74 cmd.boothowto = 0; 75 cmd.conf = "/etc/boot.conf"; 76 cmd.addr = (void *)DEFAULT_KERNEL_ADDRESS; 77 cmd.timeout = boottimeout; 78 79 st = read_conf(); 80 if (!bootprompt) 81 snprintf(cmd.path, sizeof cmd.path, "%s:%s", 82 cmd.bootdev, cmd.image); 83 84 while (1) { 85 /* no boot.conf, or no boot cmd in there */ 86 if (bootprompt && st <= 0) { 87 do { 88 printf("boot> "); 89 } while(!getcmd()); 90 } 91 92 loadrandom(BOOTRANDOM, rnddata, sizeof(rnddata)); 93 #ifdef MDRANDOM 94 mdrandom(rnddata, sizeof(rnddata)); 95 #endif 96 97 st = 0; 98 bootprompt = 1; /* allow reselect should we fail */ 99 100 printf("booting %s: ", cmd.path); 101 marks[MARK_START] = (u_long)cmd.addr; 102 if ((fd = loadfile(cmd.path, marks, LOAD_ALL)) != -1) { 103 close(fd); 104 break; 105 } 106 107 kernelfile = KERNEL; 108 try++; 109 strlcpy(cmd.image, kernelfile, sizeof(cmd.image)); 110 printf(" failed(%d). will try %s\n", errno, kernelfile); 111 112 if (try < 2) { 113 if (cmd.timeout > 0) 114 cmd.timeout++; 115 } else { 116 if (cmd.timeout) 117 printf("Turning timeout off.\n"); 118 cmd.timeout = 0; 119 } 120 } 121 122 /* exec */ 123 run_loadfile(marks, cmd.boothowto); 124 } 125 126 void 127 loadrandom(char *name, char *buf, size_t buflen) 128 { 129 char path[MAXPATHLEN]; 130 struct stat sb; 131 int fd, i; 132 133 #define O_RDONLY 0 134 135 /* Extract the device name from the kernel we are loading. */ 136 for (i = 0; i < sizeof(cmd.path); i++) { 137 if (cmd.path[i] == ':') { 138 strlcpy(path, cmd.path, i + 1); 139 snprintf(path + i, sizeof(path) - i, ":%s", name); 140 break; 141 } else if (cmd.path[i] == '\0') { 142 snprintf(path, sizeof path, "%s:%s", 143 cmd.bootdev, name); 144 break; 145 } 146 } 147 148 fd = open(path, O_RDONLY); 149 if (fd == -1) { 150 if (errno != EPERM) 151 printf("cannot open %s: %s\n", path, strerror(errno)); 152 return; 153 } 154 if (fstat(fd, &sb) == -1 || 155 sb.st_uid != 0 || 156 (sb.st_mode & (S_IWOTH|S_IROTH))) 157 goto fail; 158 (void) read(fd, buf, buflen); 159 fail: 160 close(fd); 161 } 162