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 off_t ofs; 98 int error; 99 100 error = image_copyout_region(fd, 0, image_size); 101 if (error) 102 return (error); 103 104 ofs = lseek(fd, 0L, SEEK_CUR); 105 if (ofs == -1) 106 return (0); 107 error = (ftruncate(fd, ofs) == -1) ? errno : 0; 108 return (error); 109 } 110 111 int 112 image_copyout_region(int fd, lba_t blk, lba_t size) 113 { 114 char *buffer; 115 off_t ofs; 116 size_t sz; 117 ssize_t rdsz, wrsz; 118 int error; 119 120 ofs = lseek(fd, 0L, SEEK_CUR); 121 122 blk *= secsz; 123 if (lseek(image_fd, blk, SEEK_SET) != blk) 124 return (errno); 125 buffer = malloc(BUFFER_SIZE); 126 if (buffer == NULL) 127 return (errno); 128 error = 0; 129 size *= secsz; 130 while (size > 0) { 131 sz = (BUFFER_SIZE < size) ? BUFFER_SIZE : size; 132 rdsz = read(image_fd, buffer, sz); 133 if (rdsz <= 0) { 134 error = (rdsz < 0) ? errno : 0; 135 break; 136 } 137 wrsz = (ofs == -1) ? 138 write(fd, buffer, rdsz) : 139 sparse_write(fd, buffer, rdsz); 140 if (wrsz < 0) { 141 error = errno; 142 break; 143 } 144 assert(wrsz == rdsz); 145 size -= rdsz; 146 } 147 free(buffer); 148 return (error); 149 } 150 151 lba_t 152 image_get_size(void) 153 { 154 155 return (image_size); 156 } 157 158 int 159 image_set_size(lba_t blk) 160 { 161 162 image_size = blk; 163 if (ftruncate(image_fd, blk * secsz) == -1) 164 return (errno); 165 return (0); 166 } 167 168 int 169 image_write(lba_t blk, void *buf, ssize_t len) 170 { 171 172 blk *= secsz; 173 if (lseek(image_fd, blk, SEEK_SET) != blk) 174 return (errno); 175 len *= secsz; 176 if (sparse_write(image_fd, buf, len) != len) 177 return (errno); 178 return (0); 179 } 180 181 int 182 image_init(void) 183 { 184 const char *tmpdir; 185 186 if (atexit(cleanup) == -1) 187 return (errno); 188 if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0') 189 tmpdir = _PATH_TMP; 190 snprintf(image_tmpfile, sizeof(image_tmpfile), "%s/mkimg-XXXXXX", 191 tmpdir); 192 image_fd = mkstemp(image_tmpfile); 193 if (image_fd == -1) 194 return (errno); 195 return (0); 196 } 197