cliserv.h

   1 /* This header file is shared by client & server. They really have
   2  * something to share...
   3  * */
   4
   5 /* Client/server protocol is as follows:
   6    Send INIT_PASSWD
   7    Send 64-bit cliserv_magic
   8    Send 64-bit size of exported device
   9    Send 128 bytes of zeros (reserved for future use)
  10  */
  11
  12 #include <errno.h>
  13 #include <string.h>
  14 #include <netdb.h>
  15 #include <netinet/tcp.h>
  16 #include <netinet/in.h>
  17 #include <stdlib.h>
  18
  19 #if SIZEOF_UNSIGNED_SHORT_INT==4
  20 typedef unsigned short u32;
  21 #elif SIZEOF_UNSIGNED_INT==4
  22 typedef unsigned int u32;
  23 #elif SIZEOF_UNSIGNED_LONG_INT==4
  24 typedef unsigned long u32;
  25 #else
  26 #error I need at least some 32-bit type
  27 #endif
  28
  29 #if SIZEOF_UNSIGNED_INT==8
  30 typedef unsigned int u64;
  31 #elif SIZEOF_UNSIGNED_LONG_INT==8
  32 typedef unsigned long u64;
  33 #elif SIZEOF_UNSIGNED_LONG_LONG_INT==8
  34 typedef unsigned long long u64;
  35 #else
  36 #error I need at least some 64-bit type
  37 #endif
  38
  39 #define __be32 u32
  40 #define __be64 u64
  41 #include "nbd.h"
  42
  43 #ifndef HAVE_FDATASYNC
  44 #define fdatasync(arg) fsync(arg)
  45 #endif
  46
  47 #if NBD_LFS==1
  48 /* /usr/include/features.h (included from /usr/include/sys/types.h)
  49    defines this when _GNU_SOURCE is defined
  50  */
  51 #ifndef _LARGEFILE_SOURCE
  52 #define _LARGEFILE_SOURCE
  53 #endif
  54 #define _FILE_OFFSET_BITS 64
  55 #endif
  56
  57 #ifndef G_GNUC_NORETURN
  58 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
  59 #define G_GNUC_NORETURN __attribute__((__noreturn__))
  60 #define G_GNUC_UNUSED __attribute__((unused))
  61 #else
  62 #define G_GNUC_NORETURN
  63 #define G_GNUC_UNUSED
  64 #endif
  65 #endif
  66
  67 extern const u64 cliserv_magic;
  68 extern const u64 opts_magic;
  69 extern const u64 rep_magic;
  70
  71 #define INIT_PASSWD "NBDMAGIC"
  72
  73 #define INFO(a) do { } while(0)
  74
  75 int set_nonblocking(int fd, int nb);
  76 void setmysockopt(int sock);
  77 void err_nonfatal(const char *s);
  78
  79 void err(const char *s) G_GNUC_NORETURN;
  80
  81 void logging(const char* name);
  82
  83 #ifndef ntohll
  84 uint64_t ntohll(uint64_t a);
  85 #endif
  86 #ifndef htonll
  87 #define htonll ntohll
  88 #endif
  89
  90 int readit(int f, void *buf, size_t len);
  91 int writeit(int f, void *buf, size_t len);
  92
  93 #define NBD_DEFAULT_PORT        "10809" /* Port on which named exports are
  94                                          * served */
  95
  96 /* Options that the client can select to the server */
  97 #define NBD_OPT_EXPORT_NAME     (1)     /**< Client wants to select a named export (is followed by name of export) */
  98 #define NBD_OPT_ABORT           (2)     /**< Client wishes to abort negotiation */
  99 #define NBD_OPT_LIST            (3)     /**< Client request list of supported exports (not followed by data) */
 100 #define NBD_OPT_STARTTLS        (5)     /**< Client wishes to initiate TLS */
 101 #define NBD_OPT_INFO            (6)     /**< Client wants information about the given export */
 102 #define NBD_OPT_GO              (7)     /**< Client wants to select the given and move to the transmission phase */
 103
 104 /* Replies the server can send during negotiation */
 105 #define NBD_REP_ACK             (1)     /**< ACK a request. Data: option number to be acked */
 106 #define NBD_REP_SERVER          (2)     /**< Reply to NBD_OPT_LIST (one of these per server; must be followed by NBD_REP_ACK to signal the end of the list */
 107 #define NBD_REP_INFO            (3)     /**< Reply to NBD_OPT_INFO */
 108 #define NBD_REP_FLAG_ERROR      (1 << 31)       /** If the high bit is set, the reply is an error */
 109 #define NBD_REP_ERR_UNSUP       (1 | NBD_REP_FLAG_ERROR)        /**< Client requested an option not understood by this version of the server */
 110 #define NBD_REP_ERR_POLICY      (2 | NBD_REP_FLAG_ERROR)        /**< Client requested an option not allowed by server configuration. (e.g., the option was disabled) */
 111 #define NBD_REP_ERR_INVALID     (3 | NBD_REP_FLAG_ERROR)        /**< Client issued an invalid request */
 112 #define NBD_REP_ERR_PLATFORM    (4 | NBD_REP_FLAG_ERROR)        /**< Option not supported on this platform */
 113 #define NBD_REP_ERR_TLS_REQD    (5 | NBD_REP_FLAG_ERROR)        /**< TLS required */
 114 #define NBD_REP_ERR_UNKNOWN     (6 | NBD_REP_FLAG_ERROR)        /**< NBD_OPT_INFO or ..._GO requested on unknown export */
 115 #define NBD_REP_ERR_BLOCK_SIZE_REQD (8 | NBD_REP_FLAG_ERROR)    /**< Server is not willing to serve the export without the block size being negotiated */
 116
 117 /* Global flags */
 118 #define NBD_FLAG_FIXED_NEWSTYLE (1 << 0)        /**< new-style export that actually supports extending */
 119 #define NBD_FLAG_NO_ZEROES      (1 << 1)        /**< we won't send the 128 bits of zeroes if the client sends NBD_FLAG_C_NO_ZEROES */
 120 /* Flags from client to server. */
 121 #define NBD_FLAG_C_FIXED_NEWSTYLE NBD_FLAG_FIXED_NEWSTYLE
 122 #define NBD_FLAG_C_NO_ZEROES    NBD_FLAG_NO_ZEROES
 123
 124 /* Info types */
 125 #define NBD_INFO_EXPORT         (0)
 126 #define NBD_INFO_NAME           (1)
 127 #define NBD_INFO_DESCRIPTION    (2)
 128 #define NBD_INFO_BLOCK_SIZE     (3)