1 /* 2 * dhcpcd - DHCP client daemon 3 * Copyright (c) 2006-2018 Roy Marples <roy@marples.name> 4 * All rights reserved 5 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef DHCPCOMMON_H 29 #define DHCPCOMMON_H 30 31 #include <arpa/inet.h> 32 #include <netinet/in.h> 33 34 #include <stdint.h> 35 36 #include "common.h" 37 #include "dhcpcd.h" 38 39 /* Max MTU - defines dhcp option length */ 40 #define IP_UDP_SIZE 28 41 #define MTU_MAX 1500 - IP_UDP_SIZE 42 #define MTU_MIN 576 + IP_UDP_SIZE 43 44 #define OT_REQUEST (1 << 0) 45 #define OT_UINT8 (1 << 1) 46 #define OT_INT8 (1 << 2) 47 #define OT_UINT16 (1 << 3) 48 #define OT_INT16 (1 << 4) 49 #define OT_UINT32 (1 << 5) 50 #define OT_INT32 (1 << 6) 51 #define OT_ADDRIPV4 (1 << 7) 52 #define OT_STRING (1 << 8) 53 #define OT_ARRAY (1 << 9) 54 #define OT_RFC3361 (1 << 10) 55 #define OT_RFC1035 (1 << 11) 56 #define OT_RFC3442 (1 << 12) 57 #define OT_OPTIONAL (1 << 13) 58 #define OT_ADDRIPV6 (1 << 14) 59 #define OT_BINHEX (1 << 15) 60 #define OT_FLAG (1 << 16) 61 #define OT_NOREQ (1 << 17) 62 #define OT_EMBED (1 << 18) 63 #define OT_ENCAP (1 << 19) 64 #define OT_INDEX (1 << 20) 65 #define OT_OPTION (1 << 21) 66 #define OT_DOMAIN (1 << 22) 67 #define OT_ASCII (1 << 23) 68 #define OT_RAW (1 << 24) 69 #define OT_ESCSTRING (1 << 25) 70 #define OT_ESCFILE (1 << 26) 71 #define OT_BITFLAG (1 << 27) 72 #define OT_RESERVED (1 << 28) 73 74 struct dhcp_opt { 75 uint32_t option; /* Also used for IANA Enterpise Number */ 76 int type; 77 size_t len; 78 char *var; 79 80 int index; /* Index counter for many instances of the same option */ 81 char bitflags[8]; 82 83 /* Embedded options. 84 * The option code is irrelevant here. */ 85 struct dhcp_opt *embopts; 86 size_t embopts_len; 87 88 /* Encapsulated options */ 89 struct dhcp_opt *encopts; 90 size_t encopts_len; 91 }; 92 93 const char *dhcp_get_hostname(char *, size_t, const struct if_options *); 94 struct dhcp_opt *vivso_find(uint32_t, const void *); 95 96 ssize_t dhcp_vendor(char *, size_t); 97 98 void dhcp_print_option_encoding(const struct dhcp_opt *opt, int cols); 99 #define add_option_mask(var, val) \ 100 ((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] | 1 << ((val) & 7))) 101 #define del_option_mask(var, val) \ 102 ((var)[(val) >> 3] = (uint8_t)((var)[(val) >> 3] & ~(1 << ((val) & 7)))) 103 #define has_option_mask(var, val) \ 104 ((var)[(val) >> 3] & (uint8_t)(1 << ((val) & 7))) 105 int make_option_mask(const struct dhcp_opt *, size_t, 106 const struct dhcp_opt *, size_t, 107 uint8_t *, const char *, int); 108 109 size_t encode_rfc1035(const char *src, uint8_t *dst); 110 ssize_t decode_rfc1035(char *, size_t, const uint8_t *, size_t); 111 ssize_t print_string(char *, size_t, int, const uint8_t *, size_t); 112 int dhcp_set_leasefile(char *, size_t, int, const struct interface *); 113 114 size_t dhcp_envoption(struct dhcpcd_ctx *, 115 char **, const char *, const char *, struct dhcp_opt *, 116 const uint8_t *(*dgetopt)(struct dhcpcd_ctx *, 117 size_t *, unsigned int *, size_t *, 118 const uint8_t *, size_t, struct dhcp_opt **), 119 const uint8_t *od, size_t ol); 120 void dhcp_zero_index(struct dhcp_opt *); 121 size_t dhcp_read_lease_fd(int, void **); 122 123 #endif 124