1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2020 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/statvfs.h> 30 31 #include <ctype.h> 32 #include <errno.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 36 #include "common.h" 37 #include "dhcpcd.h" 38 #include "if-options.h" 39 #include "logerr.h" 40 41 const char * 42 hwaddr_ntoa(const void *hwaddr, size_t hwlen, char *buf, size_t buflen) 43 { 44 const unsigned char *hp, *ep; 45 char *p; 46 47 if (buf == NULL) 48 return NULL; 49 50 if (hwlen * 3 > buflen) { 51 errno = ENOBUFS; 52 return NULL; 53 } 54 55 hp = hwaddr; 56 ep = hp + hwlen; 57 p = buf; 58 59 while (hp < ep) { 60 if (hp != hwaddr) 61 *p ++= ':'; 62 p += snprintf(p, 3, "%.2x", *hp++); 63 } 64 *p ++= '\0'; 65 return buf; 66 } 67 68 size_t 69 hwaddr_aton(uint8_t *buffer, const char *addr) 70 { 71 char c[3]; 72 const char *p = addr; 73 uint8_t *bp = buffer; 74 size_t len = 0; 75 76 c[2] = '\0'; 77 while (*p != '\0') { 78 /* Skip separators */ 79 c[0] = *p++; 80 switch (c[0]) { 81 case '\n': /* long duid split on lines */ 82 case ':': /* typical mac address */ 83 case '-': /* uuid */ 84 continue; 85 } 86 c[1] = *p++; 87 /* Ensure that digits are hex */ 88 if (isxdigit((unsigned char)c[0]) == 0 || 89 isxdigit((unsigned char)c[1]) == 0) 90 { 91 errno = EINVAL; 92 return 0; 93 } 94 /* We should have at least two entries 00:01 */ 95 if (len == 0 && *p == '\0') { 96 errno = EINVAL; 97 return 0; 98 } 99 if (bp) 100 *bp++ = (uint8_t)strtol(c, NULL, 16); 101 len++; 102 } 103 return len; 104 } 105 106 size_t 107 read_hwaddr_aton(uint8_t **data, const char *path) 108 { 109 FILE *fp; 110 char *buf; 111 size_t buf_len, len; 112 113 if ((fp = fopen(path, "r")) == NULL) 114 return 0; 115 116 buf = NULL; 117 buf_len = len = 0; 118 *data = NULL; 119 while (getline(&buf, &buf_len, fp) != -1) { 120 if ((len = hwaddr_aton(NULL, buf)) != 0) { 121 if (buf_len >= len) 122 *data = (uint8_t *)buf; 123 else { 124 if ((*data = malloc(len)) == NULL) 125 len = 0; 126 } 127 if (len != 0) 128 (void)hwaddr_aton(*data, buf); 129 if (buf_len < len) 130 free(buf); 131 break; 132 } 133 } 134 fclose(fp); 135 return len; 136 } 137 138 int 139 is_root_local(void) 140 { 141 #ifdef ST_LOCAL 142 struct statvfs vfs; 143 144 if (statvfs("/", &vfs) == -1) 145 return -1; 146 return vfs.f_flag & ST_LOCAL ? 1 : 0; 147 #else 148 errno = ENOTSUP; 149 return -1; 150 #endif 151 } 152