1 /* This header file is shared by client & server. They really have
2 * something to share...
5 /* Client/server protocol is as follows:
7 Send 64-bit cliserv_magic
8 Send 64-bit size of exported device
9 Send 128 bytes of zeros (reserved for future use)
16 #include <netinet/tcp.h>
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;
26 #error I need at least some 32-bit type
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;
36 #error I need at least some 64-bit type
39 #ifdef HAVE_LINUX_NBD_H
40 #include <linux/nbd.h>
42 /* get it from a kernel source somewhere, and dump it in this directory.
43 * Required for people trying to compile nbd-server on a non-linux
49 #define _LARGEFILE_SOURCE
50 #define _FILE_OFFSET_BITS 64
53 u64 cliserv_magic = 0x00420281861253LL;
54 #define INIT_PASSWD "NBDMAGIC"
56 #define INFO(a) do { } while(0)
58 void setmysockopt(int sock)
62 if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(int)) < 0)
63 INFO("(no sockopt/1: %m)");
67 if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &size, sizeof(int)) < 0)
68 INFO("(no sockopt/2: %m)");
72 if (setsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &size, sizeof(int)) < 0)
73 INFO("(no sockopt/3: %m)");
77 void err(const char *s)
79 const int maxlen = 150;
83 strncpy(s1, s, maxlen);
84 if (s2 = strstr(s, "%m")) {
85 strcpy(s1 + (s2 - s), strerror(errno));
87 strcpy(s1 + strlen(s1), s2);
90 /* Solaris doesn't have %h in syslog */
91 else if (s2 = strstr(s, "%h")) {
92 strcpy(s1 + (s2 - s), hstrerror(h_errno));
94 strcpy(s1 + strlen(s1), s2);
102 fprintf(stderr, "Error: %s\n", s1);
110 openlog(MY_NAME, LOG_PID, LOG_DAEMON);
112 setvbuf(stdout, NULL, _IONBF, 0);
113 setvbuf(stderr, NULL, _IONBF, 0);
116 #ifdef WORDS_BIGENDIAN
124 u32 lo = a & 0xffffffff;
128 return ((u64) lo) << 32U | hi;
131 #define htonll ntohll