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_LOCAL_NBD_H
42 #ifdef HAVE_LINUX_NBD_H
43 #include <linux/nbd.h>
45 #error I need an nbd.h somewhere. Either install it in <linux/nbd.h> or put it in the current directory.
50 #define _LARGEFILE_SOURCE
51 #define _FILE_OFFSET_BITS 64
54 u64 cliserv_magic = 0x00420281861253LL;
55 #define INIT_PASSWD "NBDMAGIC"
57 #define INFO(a) do { } while(0)
59 void setmysockopt(int sock)
63 if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(int)) < 0)
64 INFO("(no sockopt/1: %m)");
68 if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &size, sizeof(int)) < 0)
69 INFO("(no sockopt/2: %m)");
73 if (setsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &size, sizeof(int)) < 0)
74 INFO("(no sockopt/3: %m)");
78 void err(const char *s)
80 const int maxlen = 150;
84 strncpy(s1, s, maxlen);
85 if (s2 = strstr(s, "%m")) {
86 strcpy(s1 + (s2 - s), strerror(errno));
88 strcpy(s1 + strlen(s1), s2);
91 /* Solaris doesn't have %h in syslog */
92 else if (s2 = strstr(s, "%h")) {
93 strcpy(s1 + (s2 - s), hstrerror(h_errno));
95 strcpy(s1 + strlen(s1), s2);
103 fprintf(stderr, "Error: %s\n", s1);
111 openlog(MY_NAME, LOG_PID, LOG_DAEMON);
113 setvbuf(stdout, NULL, _IONBF, 0);
114 setvbuf(stderr, NULL, _IONBF, 0);
117 #ifdef WORDS_BIGENDIAN
125 u32 lo = a & 0xffffffff;
129 return ((u64) lo) << 32U | hi;
132 #define htonll ntohll