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/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 /* Most route(4) messages are less than 256 bytes. */ 42 #define IOVEC_BUFSIZ 256 43 44 const char * 45 hwaddr_ntoa(const void *hwaddr, size_t hwlen, char *buf, size_t buflen) 46 { 47 const unsigned char *hp, *ep; 48 char *p; 49 50 if (buf == NULL) 51 return NULL; 52 53 if (hwlen * 3 > buflen) { 54 errno = ENOBUFS; 55 return NULL; 56 } 57 58 hp = hwaddr; 59 ep = hp + hwlen; 60 p = buf; 61 62 while (hp < ep) { 63 if (hp != hwaddr) 64 *p ++= ':'; 65 p += snprintf(p, 3, "%.2x", *hp++); 66 } 67 *p ++= '\0'; 68 return buf; 69 } 70 71 size_t 72 hwaddr_aton(uint8_t *buffer, const char *addr) 73 { 74 char c[3]; 75 const char *p = addr; 76 uint8_t *bp = buffer; 77 size_t len = 0; 78 79 c[2] = '\0'; 80 while (*p != '\0') { 81 /* Skip separators */ 82 c[0] = *p++; 83 switch (c[0]) { 84 case '\n': /* long duid split on lines */ 85 case ':': /* typical mac address */ 86 case '-': /* uuid */ 87 continue; 88 } 89 c[1] = *p++; 90 /* Ensure that digits are hex */ 91 if (isxdigit((unsigned char)c[0]) == 0 || 92 isxdigit((unsigned char)c[1]) == 0) 93 { 94 errno = EINVAL; 95 return 0; 96 } 97 /* We should have at least two entries 00:01 */ 98 if (len == 0 && *p == '\0') { 99 errno = EINVAL; 100 return 0; 101 } 102 if (bp) 103 *bp++ = (uint8_t)strtol(c, NULL, 16); 104 len++; 105 } 106 return len; 107 } 108 109 size_t 110 read_hwaddr_aton(uint8_t **data, const char *path) 111 { 112 FILE *fp; 113 char *buf; 114 size_t buf_len, len; 115 116 if ((fp = fopen(path, "r")) == NULL) 117 return 0; 118 119 buf = NULL; 120 buf_len = len = 0; 121 *data = NULL; 122 while (getline(&buf, &buf_len, fp) != -1) { 123 if ((len = hwaddr_aton(NULL, buf)) != 0) { 124 if (buf_len >= len) 125 *data = (uint8_t *)buf; 126 else { 127 if ((*data = malloc(len)) == NULL) 128 len = 0; 129 } 130 if (len != 0) 131 (void)hwaddr_aton(*data, buf); 132 if (buf_len < len) 133 free(buf); 134 break; 135 } 136 } 137 fclose(fp); 138 return len; 139 } 140 141 int 142 is_root_local(void) 143 { 144 #ifdef ST_LOCAL 145 struct statvfs vfs; 146 147 if (statvfs("/", &vfs) == -1) 148 return -1; 149 return vfs.f_flag & ST_LOCAL ? 1 : 0; 150 #else 151 errno = ENOTSUP; 152 return -1; 153 #endif 154 } 155