compat/cmsg.h

   1 /*
   2  * Compatibility-layer for CMSG_
   3  */
   4 #ifndef SQUID_COMPAT_CMSG_H
   5 #define SQUID_COMPAT_CMSG_H
   6
   7 // cmsg.h is found through sys/socket.h
   8 #if HAVE_SYS_SOCKET_H
   9 #include <sys/socket.h>
  10 #endif
  11
  12 #ifndef CMSG_H_
  13 #define CMSG_H_
  14
  15 /* mostly windows-specific */
  16 #ifndef CMSG_SPACE
  17 struct cmsghdr {
  18     unsigned int    cmsg_len;
  19     int  cmsg_level;
  20     int     cmsg_type;
  21     unsigned char cmsg_data[16]; /* dummy */
  22     /* followed by UCHAR cmsg_data[]; */
  23 } ;
  24
  25 /* lifted off https://metacpan.org/source/SAMPO/Socket-PassAccessRights-0.03/passfd.c */
  26 #ifndef CMSG_DATA
  27 # define CMSG_DATA(cmsg) ((cmsg)->cmsg_data)
  28 #endif
  29
  30 #ifndef CMSG_NXTHDR
  31 # define CMSG_NXTHDR(mhdr, cmsg) __cmsg_nxthdr (mhdr, cmsg)
  32 #endif
  33
  34 #ifndef CMSG_FIRSTHDR
  35 # define CMSG_FIRSTHDR(mhdr) \
  36   ((size_t) (mhdr)->msg_controllen >= sizeof (struct cmsghdr)        \
  37    ? (struct cmsghdr *) (mhdr)->msg_control : (struct cmsghdr *) NULL)
  38 #endif
  39
  40 #ifndef CMSG_ALIGN
  41 # define CMSG_ALIGN(len) (((len) + sizeof (size_t) - 1) \
  42              & ~(sizeof (size_t) - 1))
  43 #endif
  44
  45 # define CMSG_SPACE(len) (CMSG_ALIGN (len) \
  46              + CMSG_ALIGN (sizeof (struct cmsghdr)))
  47 #undef HAVE_CONSTANT_CMSG_SPACE
  48 #define HAVE_CONSTANT_CMSG_SPACE 1
  49
  50 #ifndef CMSG_LEN
  51 # define CMSG_LEN(len)   (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
  52 #endif
  53
  54 struct msghdr {
  55     void *msg_name;             /* Address to send to/receive from.  */
  56     socklen_t msg_namelen;      /* Length of address data.  */
  57
  58     struct iovec *msg_iov;      /* Vector of data to send/receive into.  */
  59     size_t msg_iovlen;          /* Number of elements in the vector.  */
  60
  61     void *msg_control;          /* Ancillary data (eg BSD filedesc passing). */
  62     size_t msg_controllen;      /* Ancillary data buffer length.
  63                                    !! The type should be socklen_t but the
  64                                    definition of the kernel is incompatible
  65                                    with this.  */
  66
  67     int msg_flags;              /* Flags on received message.  */
  68 };
  69
  70 struct iovec {
  71     void *iov_base;
  72     size_t iov_len;
  73 };
  74 struct sockaddr_un {
  75     char sun_family;
  76     char sun_path[256];   /* pathname */
  77 };
  78 # define SUN_LEN(ptr) ((size_t) (((struct sockaddr_un *) 0)->sun_path)        \
  79         + strlen ((ptr)->sun_path))
  80
  81 #endif /* CMSG_SPACE */
  82
  83 #ifndef SCM_RIGHTS
  84 #define SCM_RIGHTS 1
  85 #endif
  86 #ifndef SCM_CREDENTIALS
  87 #define SCM_CREDENTIALS 2
  88 #endif
  89 #ifndef SCM_SECURITY
  90 #define SCM_SECURITY 3
  91 #endif
  92
  93 #ifndef AF_LOCAL
  94 #define AF_LOCAL 1
  95 #endif
  96
  97 #endif /* CMSG_H_ */
  98
  99 // CMSG_SPACE is not constant on some systems (in particular Max OS X),
 100 // provide a replacement that can be used at build time in that case
 101 // NP: this must go below our replacement definitions.
 102
 103 #if HAVE_CONSTANT_CMSG_SPACE
 104 #define SQUID_CMSG_SPACE CMSG_SPACE
 105 #else
 106 // add 16 bytes for header and data alignment
 107 #define SQUID_CMSG_SPACE(len) (sizeof(struct cmsghdr) + (len) + 16)
 108 #endif
 109
 110 #endif /* SQUID_COMPAT_CMSG_H */