Network Block Device  @PACKAGE_VERSION@
cliserv.h
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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 void setmysockopt(int sock);
76 void err_nonfatal(const char *s);
77 
78 void err(const char *s) G_GNUC_NORETURN;
79 
80 void logging(const char* name);
81 
82 uint64_t ntohll(uint64_t a);
83 #define htonll ntohll
84 
85 #define NBD_DEFAULT_PORT "10809" /* Port on which named exports are
86  * served */
87 
88 /* Options that the client can select to the server */
89 #define NBD_OPT_EXPORT_NAME (1) /** Client wants to select a named export (is followed by name of export) */
90 #define NBD_OPT_ABORT (2) /** Client wishes to abort negotiation */
91 #define NBD_OPT_LIST (3) /** Client request list of supported exports (not followed by data) */
92 
93 /* Replies the server can send during negotiation */
94 #define NBD_REP_ACK (1) /** ACK a request. Data: option number to be acked */
95 #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 */
96 #define NBD_REP_FLAG_ERROR (1 << 31) /** If the high bit is set, the reply is an error */
97 #define NBD_REP_ERR_UNSUP (1 | NBD_REP_FLAG_ERROR) /** Client requested an option not understood by this version of the server */
98 #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) */
99 #define NBD_REP_ERR_INVALID (3 | NBD_REP_FLAG_ERROR) /** Client issued an invalid request */
100 #define NBD_REP_ERR_PLATFORM (4 | NBD_REP_FLAG_ERROR) /** Option not supported on this platform */
101 
102 /* Global flags */
103 #define NBD_FLAG_FIXED_NEWSTYLE (1 << 0) /* new-style export that actually supports extending */
104 #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 */
105 /* Flags from client to server. Only one such option currently. */
106 #define NBD_FLAG_C_FIXED_NEWSTYLE NBD_FLAG_FIXED_NEWSTYLE
107 #define NBD_FLAG_C_NO_ZEROES NBD_FLAG_NO_ZEROES
#define G_GNUC_NORETURN
Definition: cliserv.h:62
uint64_t ntohll(uint64_t a)
void setmysockopt(int sock)
Definition: cliserv.c:12
void err_nonfatal(const char *s)
Definition: cliserv.c:30
const u64 opts_magic
Definition: cliserv.c:9
const u64 cliserv_magic
Definition: cliserv.c:8
void err(const char *s) G_GNUC_NORETURN
Definition: cliserv.c:56
const u64 rep_magic
Definition: cliserv.c:10
void logging(const char *name)
Definition: cliserv.c:61