1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2023 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 #ifndef COMMON_H 30 #define COMMON_H 31 32 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/types.h> 35 #include <stdint.h> 36 #include <stdio.h> 37 38 /* Define eloop queues here, as other apps share eloop.h */ 39 #define ELOOP_DHCPCD 1 /* default queue */ 40 #define ELOOP_DHCP 2 41 #define ELOOP_ARP 3 42 #define ELOOP_IPV4LL 4 43 #define ELOOP_IPV6 5 44 #define ELOOP_IPV6ND 6 45 #define ELOOP_IPV6RA_EXPIRE 7 46 #define ELOOP_DHCP6 8 47 #define ELOOP_IF 9 48 49 #ifndef HOSTNAME_MAX_LEN 50 #define HOSTNAME_MAX_LEN 250 /* 255 - 3 (FQDN) - 2 (DNS enc) */ 51 #endif 52 53 #ifndef MIN 54 #define MIN(a,b) ((/*CONSTCOND*/(a)<(b))?(a):(b)) 55 #define MAX(a,b) ((/*CONSTCOND*/(a)>(b))?(a):(b)) 56 #endif 57 58 #define UNCONST(a) ((void *)(unsigned long)(const void *)(a)) 59 #define STRINGIFY(a) #a 60 #define TOSTRING(a) STRINGIFY(a) 61 #define UNUSED(a) (void)(a) 62 63 #define ROUNDUP4(a) (1 + (((a) - 1) | 3)) 64 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 65 66 /* Some systems don't define timespec macros */ 67 #ifndef timespecclear 68 #define timespecclear(tsp) (tsp)->tv_sec = (time_t)((tsp)->tv_nsec = 0L) 69 #define timespecisset(tsp) ((tsp)->tv_sec || (tsp)->tv_nsec) 70 #endif 71 72 #if __GNUC__ > 2 || defined(__INTEL_COMPILER) 73 # ifndef __packed 74 # define __packed __attribute__((__packed__)) 75 # endif 76 # ifndef __unused 77 # define __unused __attribute__((__unused__)) 78 # endif 79 #else 80 # ifndef __packed 81 # define __packed 82 # endif 83 # ifndef __unused 84 # define __unused 85 # endif 86 #endif 87 88 /* Needed for rbtree(3) compat */ 89 #ifndef __RCSID 90 #define __RCSID(a) 91 #endif 92 #ifndef __predict_false 93 # if __GNUC__ > 2 94 # define __predict_true(exp) __builtin_expect((exp) != 0, 1) 95 # define __predict_false(exp) __builtin_expect((exp) != 0, 0) 96 #else 97 # define __predict_true(exp) (exp) 98 # define __predict_false(exp) (exp) 99 # endif 100 #endif 101 #ifndef __BEGIN_DECLS 102 # if defined(__cplusplus) 103 # define __BEGIN_DECLS extern "C" { 104 # define __END_DECLS }; 105 # else /* __BEGIN_DECLS */ 106 # define __BEGIN_DECLS 107 # define __END_DECLS 108 # endif /* __BEGIN_DECLS */ 109 #endif /* __BEGIN_DECLS */ 110 111 #ifndef __fallthrough 112 # if __GNUC__ >= 7 113 # define __fallthrough __attribute__((fallthrough)) 114 # else 115 # define __fallthrough 116 # endif 117 #endif 118 119 /* 120 * Compile Time Assertion. 121 */ 122 #ifndef __CTASSERT 123 # ifdef __COUNTER__ 124 # define __CTASSERT(x) __CTASSERT0(x, __ctassert, __COUNTER__) 125 # else 126 # define __CTASSERT(x) __CTASSERT99(x, __INCLUDE_LEVEL__, __LINE__) 127 # define __CTASSERT99(x, a, b) __CTASSERT0(x, __CONCAT(__ctassert,a), \ 128 __CONCAT(_,b)) 129 # endif 130 # define __CTASSERT0(x, y, z) __CTASSERT1(x, y, z) 131 # define __CTASSERT1(x, y, z) typedef char y ## z[/*CONSTCOND*/(x) ? 1 : -1] __unused 132 #endif 133 134 #ifndef __arraycount 135 # define __arraycount(__x) (sizeof(__x) / sizeof(__x[0])) 136 #endif 137 138 /* We don't really need this as our supported systems define __restrict 139 * automatically for us, but it is here for completeness. */ 140 #ifndef __restrict 141 # if defined(__lint__) 142 # define __restrict 143 # elif __STDC_VERSION__ >= 199901L 144 # define __restrict restrict 145 # elif !(2 < __GNUC__ || (2 == __GNU_C && 95 <= __GNUC_VERSION__)) 146 # define __restrict 147 # endif 148 #endif 149 150 const char *hwaddr_ntoa(const void *, size_t, char *, size_t); 151 size_t hwaddr_aton(uint8_t *, const char *); 152 ssize_t readfile(const char *, void *, size_t); 153 ssize_t writefile(const char *, mode_t, const void *, size_t); 154 int filemtime(const char *, time_t *); 155 char *get_line(char ** __restrict, ssize_t * __restrict); 156 int is_root_local(void); 157 #endif 158