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)
17 #if SIZEOF_UNSIGNED_SHORT_INT==4
18 typedef unsigned short u32;
19 #elif SIZEOF_UNSIGNED_INT==4
20 typedef unsigned int u32;
21 #elif SIZEOF_UNSIGNED_LONG_INT==4
22 typedef unsigned long u32;
24 #error I need at least some 32-bit type
27 #if SIZEOF_UNSIGNED_INT==8
28 typedef unsigned int u64;
29 #elif SIZEOF_UNSIGNED_LONG_INT==8
30 typedef unsigned long u64;
31 #elif SIZEOF_UNSIGNED_LONG_LONG_INT==8
32 typedef unsigned long long u64;
34 #error I need at least some 64-bit type
37 #ifdef HAVE_LINUX_NBD_H
38 #include <linux/nbd.h>
40 /* get it from a kernel source somewhere, and dump it in this directory.
41 * Required for people trying to compile nbd-server on a non-linux
46 u64 cliserv_magic = 0x00420281861253LL;
47 #define INIT_PASSWD "NBDMAGIC"
49 #define INFO(a) do { } while(0)
51 void setmysockopt(int sock)
55 if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(int)) < 0)
56 INFO("(no sockopt/1: %m)");
60 if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &size, sizeof(int)) < 0)
61 INFO("(no sockopt/2: %m)");
65 if (setsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &size, sizeof(int)) < 0)
66 INFO("(no sockopt/3: %m)");
70 void err(const char *s)
72 const int maxlen = 150;
76 strncpy(s1, s, maxlen);
77 if (s2 = strstr(s, "%m")) {
78 strcpy(s1 + (s2 - s), strerror(errno));
80 strcpy(s1 + strlen(s1), s2);
83 /* Solaris doesn't have %h in syslog */
84 else if (s2 = strstr(s, "%h")) {
85 strcpy(s1 + (s2 - s), hstrerror(h_errno));
87 strcpy(s1 + strlen(s1), s2);
95 fprintf(stderr, "Error: %s\n", s1);
103 openlog(MY_NAME, LOG_PID, LOG_DAEMON);
105 setvbuf(stdout, NULL, _IONBF, 0);
106 setvbuf(stderr, NULL, _IONBF, 0);
109 #ifdef WORDS_BIGENDIAN
117 u32 lo = a & 0xffffffff;
121 return ((u64) lo) << 32U | hi;
124 #define htonll ntohll