1 /*- 2 * Copyright (c) 2017-2018, Juniper Networks, Inc. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 14 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 15 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 16 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 17 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 19 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 #include <sys/cdefs.h> 26 #include <libsecureboot.h> 27 28 unsigned char * 29 read_fd(int fd, size_t len) 30 { 31 int m, n, x; 32 unsigned char *buf; 33 34 buf = malloc(len + 1); 35 if (buf != NULL) { 36 for (x = 0, m = len; m > 0; ) { 37 n = read(fd, &buf[x], m); 38 if (n < 0) 39 break; 40 if (n > 0) { 41 m -= n; 42 x += n; 43 } 44 } 45 if (m == 0) { 46 buf[len] = '\0'; 47 return (buf); 48 } 49 free(buf); 50 } 51 return (NULL); 52 } 53 54 unsigned char * 55 read_file(const char *path, size_t *len) 56 { 57 struct stat st; 58 unsigned char *ucp; 59 int fd; 60 61 if (len) 62 *len = 0; 63 if ((fd = open(path, O_RDONLY)) < 0) 64 return (NULL); 65 fstat(fd, &st); 66 ucp = read_fd(fd, st.st_size); 67 close(fd); 68 if (ucp != NULL) { 69 if (len != NULL) 70 *len = st.st_size; 71 } 72 #ifdef _STANDALONE 73 else 74 printf("%s: out of memory! %lu\n", __func__, 75 (unsigned long)len); 76 #endif 77 78 return (ucp); 79 } 80 81