mDNSPosix/mDNSUNP.h

   1 /* -*- Mode: C; tab-width: 4 -*-
   2  *
   3  * Copyright (c) 2002-2018 Apple Inc. All rights reserved.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  */
  17
  18 #ifndef __mDNSUNP_h
  19 #define __mDNSUNP_h
  20
  21 #include <sys/types.h>
  22 #include <sys/socket.h>
  23 #include <net/if.h>
  24 #include <netinet/in.h>
  25
  26 #ifdef HAVE_LINUX
  27 #include <linux/socket.h>
  28 #define IPV6_2292_PKTINFO  IPV6_2292PKTINFO
  29 #define IPV6_2292_HOPLIMIT IPV6_2292HOPLIMIT
  30 #else
  31 // The following are the supported non-linux posix OSes -
  32 // netbsd, freebsd and openbsd.
  33 #if HAVE_IPV6
  34 #define IPV6_2292_PKTINFO  19
  35 #define IPV6_2292_HOPLIMIT 20
  36 #endif
  37 #endif
  38
  39 #ifdef  __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 #ifdef NOT_HAVE_SOCKLEN_T
  44 typedef unsigned int socklen_t;
  45 #endif
  46
  47 #if !defined(_SS_MAXSIZE)
  48 #if HAVE_IPV6
  49 #define sockaddr_storage sockaddr_in6
  50 #else
  51 #define sockaddr_storage sockaddr
  52 #endif // HAVE_IPV6
  53 #endif // !defined(_SS_MAXSIZE)
  54
  55 #ifndef NOT_HAVE_SA_LEN
  56 #define GET_SA_LEN(X) (sizeof(struct sockaddr) > ((struct sockaddr*)&(X))->sa_len ? \
  57                        sizeof(struct sockaddr) : ((struct sockaddr*)&(X))->sa_len   )
  58 #elif HAVE_IPV6
  59 #define GET_SA_LEN(X) (((struct sockaddr*)&(X))->sa_family == AF_INET  ? sizeof(struct sockaddr_in) : \
  60                        ((struct sockaddr*)&(X))->sa_family == AF_INET6 ? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr))
  61 #else
  62 #define GET_SA_LEN(X) (((struct sockaddr*)&(X))->sa_family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr))
  63 #endif
  64
  65 #define IFI_NAME    IFNAMSIZ    /* same as IFNAMSIZ in <net/if.h> */
  66 #define IFI_HADDR   8           /* allow for 64-bit EUI-64 in future */
  67
  68 // Renamed from my_in_pktinfo because in_pktinfo is used by Linux.
  69
  70 struct my_in_pktinfo {
  71     struct sockaddr_storage ipi_addr;
  72     int ipi_ifindex;                                /* received interface index */
  73     char ipi_ifname[IFI_NAME];                      /* received interface name  */
  74 };
  75
  76 /* From the text (Stevens, section 20.2): */
  77 /* 'As an example of recvmsg we will write a function named recvfrom_flags that */
  78 /* is similar to recvfrom but also returns: */
  79 /*      1. the returned msg_flags value, */
  80 /*      2. the destination addres of the received datagram (from the IP_RECVDSTADDR socket option, and */
  81 /*      3. the index of the interface on which the datagram was received (the IP_RECVIF socket option).' */
  82 extern ssize_t recvfrom_flags(int fd, void *ptr, size_t nbytes, int *flagsp,
  83                               struct sockaddr *sa, socklen_t *salenptr, struct my_in_pktinfo *pktp, u_char *ttl);
  84
  85 struct ifi_info {
  86     char ifi_name[IFI_NAME];    /* interface name, null terminated */
  87     u_char ifi_haddr[IFI_HADDR]; /* hardware address */
  88     u_short ifi_hlen;           /* #bytes in hardware address: 0, 6, 8 */
  89     short ifi_flags;            /* IFF_xxx constants from <net/if.h> */
  90     short ifi_myflags;          /* our own IFI_xxx flags */
  91     int ifi_index;              /* interface index */
  92     struct sockaddr  *ifi_addr; /* primary address */
  93     struct sockaddr  *ifi_netmask;
  94     struct sockaddr  *ifi_brdaddr; /* broadcast address */
  95     struct sockaddr  *ifi_dstaddr; /* destination address */
  96     struct ifi_info  *ifi_next; /* next of these structures */
  97 };
  98
  99 #if defined(AF_INET6) && HAVE_IPV6 && HAVE_LINUX
 100 #define PROC_IFINET6_PATH "/proc/net/if_inet6"
 101 extern struct ifi_info  *get_ifi_info_linuxv6(int doaliases);
 102 #endif
 103
 104 #if defined(AF_INET6) && HAVE_IPV6
 105 #define INET6_ADDRSTRLEN 46 /*Maximum length of IPv6 address */
 106 #endif
 107
 108
 109
 110 #define IFI_ALIAS   1           /* ifi_addr is an alias */
 111
 112 /* From the text (Stevens, section 16.6): */
 113 /* 'Since many programs need to know all the interfaces on a system, we will develop a */
 114 /* function of our own named get_ifi_info that returns a linked list of structures, one */
 115 /* for each interface that is currently "up."' */
 116 extern struct ifi_info  *get_ifi_info(int family, int doaliases);
 117
 118 /* 'The free_ifi_info function, which takes a pointer that was */
 119 /* returned by get_ifi_info and frees all the dynamic memory.' */
 120 extern void             free_ifi_info(struct ifi_info *);
 121
 122 #ifdef NOT_HAVE_DAEMON
 123 extern int daemon(int nochdir, int noclose);
 124 #endif
 125
 126 #ifdef  __cplusplus
 127 }
 128 #endif
 129
 130 #endif