1 /*- 2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> 3 * Copyright (c) 2006 Marcel Moolenaar 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD: head/sys/boot/efi/loader/devicename.c 294068 2016-01-15 02:33:47Z smh $"); 30 31 #include <stand.h> 32 #include <string.h> 33 #include <sys/disklabel.h> 34 #include <sys/param.h> 35 #include <bootstrap.h> 36 37 #include <efi.h> 38 #include <efilib.h> 39 40 #include "loader_efi.h" 41 42 static int efi_parsedev(struct efi_devdesc **, const char *, const char **); 43 44 /* 45 * Point (dev) at an allocated device specifier for the device matching the 46 * path in (devspec). If it contains an explicit device specification, 47 * use that. If not, use the default device. 48 */ 49 int 50 efi_getdev(void **vdev, const char *devspec, const char **path) 51 { 52 struct efi_devdesc **dev = (struct efi_devdesc **)vdev; 53 int rv; 54 55 /* 56 * If it looks like this is just a path and no device, then 57 * use the current device instead. 58 */ 59 if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) { 60 rv = efi_parsedev(dev, getenv("currdev"), NULL); 61 if (rv == 0 && path != NULL) 62 *path = devspec; 63 return (rv); 64 } 65 66 /* Parse the device name off the beginning of the devspec. */ 67 return (efi_parsedev(dev, devspec, path)); 68 } 69 70 /* 71 * Point (dev) at an allocated device specifier matching the string version 72 * at the beginning of (devspec). Return a pointer to the remaining 73 * text in (path). 74 * 75 * In all cases, the beginning of (devspec) is compared to the names 76 * of known devices in the device switch, and then any following text 77 * is parsed according to the rules applied to the device type. 78 * 79 * For disk-type devices, the syntax is: 80 * 81 * fs<unit>: 82 */ 83 static int 84 efi_parsedev(struct efi_devdesc **dev, const char *devspec, const char **path) 85 { 86 struct efi_devdesc *idev; 87 struct devsw *dv; 88 char *cp; 89 const char *np; 90 int i; 91 92 /* minimum length check */ 93 if (strlen(devspec) < 2) 94 return (EINVAL); 95 96 /* look for a device that matches */ 97 for (i = 0; devsw[i] != NULL; i++) { 98 dv = devsw[i]; 99 if (!strncmp(devspec, dv->dv_name, strlen(dv->dv_name))) 100 break; 101 } 102 if (devsw[i] == NULL) 103 return (ENOENT); 104 105 np = devspec + strlen(dv->dv_name); 106 107 { 108 idev = malloc(sizeof(struct efi_devdesc)); 109 if (idev == NULL) 110 return (ENOMEM); 111 112 idev->d_dev = dv; 113 idev->d_type = dv->dv_type; 114 idev->d_kind.efidisk.unit = -1; 115 if (*np != '\0' && *np != ':') { 116 idev->d_kind.efidisk.unit = strtol(np, &cp, 0); 117 if (cp == np) { 118 idev->d_kind.efidisk.unit = -1; 119 free(idev); 120 return (EUNIT); 121 } 122 } 123 } 124 125 if (*cp != '\0' && *cp != ':') { 126 free(idev); 127 return (EINVAL); 128 } 129 130 if (path != NULL) 131 *path = (*cp == 0) ? cp : cp + 1; 132 if (dev != NULL) 133 *dev = idev; 134 else 135 free(idev); 136 return (0); 137 } 138 139 char * 140 efi_fmtdev(void *vdev) 141 { 142 struct efi_devdesc *dev = (struct efi_devdesc *)vdev; 143 static char buf[SPECNAMELEN + 1]; 144 145 switch(dev->d_type) { 146 case DEVT_NONE: 147 strcpy(buf, "(no device)"); 148 break; 149 150 default: 151 sprintf(buf, "%s%d:", dev->d_dev->dv_name, 152 dev->d_kind.efidisk.unit); 153 break; 154 } 155 156 return (buf); 157 } 158 159 /* 160 * Set currdev to suit the value being supplied in (value) 161 */ 162 int 163 efi_setcurrdev(struct env_var *ev, int flags, const void *value) 164 { 165 struct efi_devdesc *ncurr; 166 int rv; 167 168 rv = efi_parsedev(&ncurr, value, NULL); 169 if (rv != 0) 170 return (rv); 171 172 free(ncurr); 173 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 174 return (0); 175 } 176