1 /*- 2 * Copyright (c) 2014 Juniper Networks, Inc. 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 #include <sys/types.h> 31 #include <assert.h> 32 #include <errno.h> 33 #include <limits.h> 34 #include <paths.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 39 #include "image.h" 40 #include "mkimg.h" 41 42 #define BUFFER_SIZE (1024*1024) 43 44 static char image_tmpfile[PATH_MAX]; 45 static int image_fd = -1; 46 static lba_t image_size; 47 48 static void 49 cleanup(void) 50 { 51 52 if (image_fd != -1) 53 close(image_fd); 54 unlink(image_tmpfile); 55 } 56 57 int 58 image_copyin(lba_t blk, int fd, uint64_t *sizep) 59 { 60 char *buffer; 61 uint64_t bytesize; 62 ssize_t bcnt, rdsz; 63 int error, partial; 64 65 assert(BUFFER_SIZE % secsz == 0); 66 67 buffer = malloc(BUFFER_SIZE); 68 if (buffer == NULL) 69 return (ENOMEM); 70 bytesize = 0; 71 partial = 0; 72 while (1) { 73 rdsz = read(fd, buffer, BUFFER_SIZE); 74 if (rdsz <= 0) { 75 error = (rdsz < 0) ? errno : 0; 76 break; 77 } 78 if (partial) 79 abort(); 80 bytesize += rdsz; 81 bcnt = (rdsz + secsz - 1) / secsz; 82 error = image_write(blk, buffer, bcnt); 83 if (error) 84 break; 85 blk += bcnt; 86 partial = ((ssize_t)(bcnt * secsz) != rdsz) ? 1 : 0; 87 } 88 free(buffer); 89 if (sizep != NULL) 90 *sizep = bytesize; 91 return (error); 92 } 93 94 int 95 image_copyout(int fd) 96 { 97 int error; 98 99 error = image_copyout_region(fd, 0, image_size); 100 if (!error) 101 error = image_copyout_done(fd); 102 return (error); 103 } 104 105 int 106 image_copyout_done(int fd) 107 { 108 off_t ofs; 109 int error; 110 111 ofs = lseek(fd, 0L, SEEK_CUR); 112 if (ofs == -1) 113 return (0); 114 error = (ftruncate(fd, ofs) == -1) ? errno : 0; 115 return (error); 116 } 117 118 int 119 image_copyout_region(int fd, lba_t blk, lba_t size) 120 { 121 char *buffer; 122 off_t ofs; 123 size_t sz; 124 ssize_t rdsz, wrsz; 125 int error; 126 127 ofs = lseek(fd, 0L, SEEK_CUR); 128 129 blk *= secsz; 130 if (lseek(image_fd, blk, SEEK_SET) != blk) 131 return (errno); 132 buffer = malloc(BUFFER_SIZE); 133 if (buffer == NULL) 134 return (errno); 135 error = 0; 136 size *= secsz; 137 while (size > 0) { 138 sz = (BUFFER_SIZE < size) ? BUFFER_SIZE : size; 139 rdsz = read(image_fd, buffer, sz); 140 if (rdsz <= 0) { 141 error = (rdsz < 0) ? errno : 0; 142 break; 143 } 144 wrsz = (ofs == -1) ? 145 write(fd, buffer, rdsz) : 146 sparse_write(fd, buffer, rdsz); 147 if (wrsz < 0) { 148 error = errno; 149 break; 150 } 151 assert(wrsz == rdsz); 152 size -= rdsz; 153 } 154 free(buffer); 155 return (error); 156 } 157 158 int 159 image_data(lba_t blk, lba_t size) 160 { 161 char *buffer, *p; 162 163 blk *= secsz; 164 if (lseek(image_fd, blk, SEEK_SET) != blk) 165 return (1); 166 167 size *= secsz; 168 buffer = malloc(size); 169 if (buffer == NULL) 170 return (1); 171 172 if (read(image_fd, buffer, size) != (ssize_t)size) { 173 free(buffer); 174 return (1); 175 } 176 177 p = buffer; 178 while (size > 0 && *p == '\0') 179 size--, p++; 180 181 free(buffer); 182 return ((size == 0) ? 0 : 1); 183 } 184 185 lba_t 186 image_get_size(void) 187 { 188 189 return (image_size); 190 } 191 192 int 193 image_set_size(lba_t blk) 194 { 195 196 image_size = blk; 197 if (ftruncate(image_fd, blk * secsz) == -1) 198 return (errno); 199 return (0); 200 } 201 202 int 203 image_write(lba_t blk, void *buf, ssize_t len) 204 { 205 206 blk *= secsz; 207 if (lseek(image_fd, blk, SEEK_SET) != blk) 208 return (errno); 209 len *= secsz; 210 if (sparse_write(image_fd, buf, len) != len) 211 return (errno); 212 return (0); 213 } 214 215 int 216 image_init(void) 217 { 218 const char *tmpdir; 219 220 if (atexit(cleanup) == -1) 221 return (errno); 222 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 223 tmpdir = _PATH_TMP; 224 snprintf(image_tmpfile, sizeof(image_tmpfile), "%s/mkimg-XXXXXX", 225 tmpdir); 226 image_fd = mkstemp(image_tmpfile); 227 if (image_fd == -1) 228 return (errno); 229 return (0); 230 } 231