1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2019 Roy Marples <roy@marples.name> 5 * All rights reserved 6 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #ifdef __sun 32 #include <sys/sysmacros.h> 33 #endif 34 35 #include <assert.h> 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <limits.h> 41 #ifdef BSD 42 # include <paths.h> 43 #endif 44 #include <stdarg.h> 45 #include <stdint.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <time.h> 50 #include <unistd.h> 51 52 #include "common.h" 53 #include "dhcpcd.h" 54 #include "if-options.h" 55 #include "logerr.h" 56 57 /* Most route(4) messages are less than 256 bytes. */ 58 #define IOVEC_BUFSIZ 256 59 60 const char * 61 hwaddr_ntoa(const void *hwaddr, size_t hwlen, char *buf, size_t buflen) 62 { 63 const unsigned char *hp, *ep; 64 char *p; 65 66 if (buf == NULL) 67 return NULL; 68 69 if (hwlen * 3 > buflen) { 70 errno = ENOBUFS; 71 return NULL; 72 } 73 74 hp = hwaddr; 75 ep = hp + hwlen; 76 p = buf; 77 78 while (hp < ep) { 79 if (hp != hwaddr) 80 *p ++= ':'; 81 p += snprintf(p, 3, "%.2x", *hp++); 82 } 83 *p ++= '\0'; 84 return buf; 85 } 86 87 size_t 88 hwaddr_aton(uint8_t *buffer, const char *addr) 89 { 90 char c[3]; 91 const char *p = addr; 92 uint8_t *bp = buffer; 93 size_t len = 0; 94 95 c[2] = '\0'; 96 while (*p != '\0') { 97 /* Skip separators */ 98 c[0] = *p++; 99 switch (c[0]) { 100 case '\n': /* long duid split on lines */ 101 case ':': /* typical mac address */ 102 case '-': /* uuid */ 103 continue; 104 } 105 c[1] = *p++; 106 /* Ensure that digits are hex */ 107 if (isxdigit((unsigned char)c[0]) == 0 || 108 isxdigit((unsigned char)c[1]) == 0) 109 { 110 errno = EINVAL; 111 return 0; 112 } 113 /* We should have at least two entries 00:01 */ 114 if (len == 0 && *p == '\0') { 115 errno = EINVAL; 116 return 0; 117 } 118 if (bp) 119 *bp++ = (uint8_t)strtol(c, NULL, 16); 120 len++; 121 } 122 return len; 123 } 124 125 size_t 126 read_hwaddr_aton(uint8_t **data, const char *path) 127 { 128 FILE *fp; 129 char *buf; 130 size_t buf_len, len; 131 132 if ((fp = fopen(path, "r")) == NULL) 133 return 0; 134 135 buf = NULL; 136 buf_len = len = 0; 137 *data = NULL; 138 while (getline(&buf, &buf_len, fp) != -1) { 139 if ((len = hwaddr_aton(NULL, buf)) != 0) { 140 if (buf_len >= len) 141 *data = (uint8_t *)buf; 142 else { 143 if ((*data = malloc(len)) == NULL) 144 len = 0; 145 } 146 if (len != 0) 147 (void)hwaddr_aton(*data, buf); 148 if (buf_len < len) 149 free(buf); 150 break; 151 } 152 } 153 fclose(fp); 154 return len; 155 } 156