cliserv.h

00001 /* This header file is shared by client & server. They really have
00002  * something to share...
00003  * */
00004 
00005 /* Client/server protocol is as follows:
00006    Send INIT_PASSWD
00007    Send 64-bit cliserv_magic
00008    Send 64-bit size of exported device
00009    Send 128 bytes of zeros (reserved for future use)
00010  */
00011 
00012 #include <errno.h>
00013 #include <string.h>
00014 #include <netdb.h>
00015 #include <netinet/tcp.h>
00016 #include <stdlib.h>
00017 
00018 #if SIZEOF_UNSIGNED_SHORT_INT==4
00019 typedef unsigned short u32;
00020 #elif SIZEOF_UNSIGNED_INT==4
00021 typedef unsigned int u32;
00022 #elif SIZEOF_UNSIGNED_LONG_INT==4
00023 typedef unsigned long u32;
00024 #else
00025 #error I need at least some 32-bit type
00026 #endif
00027 
00028 #if SIZEOF_UNSIGNED_INT==8
00029 typedef unsigned int u64;
00030 #elif SIZEOF_UNSIGNED_LONG_INT==8
00031 typedef unsigned long u64;
00032 #elif SIZEOF_UNSIGNED_LONG_LONG_INT==8
00033 typedef unsigned long long u64;
00034 #else
00035 #error I need at least some 64-bit type
00036 #endif
00037 
00038 #ifdef NBD_H_LOCAL
00039 #include "nbd.h"
00040 #else
00041 #ifdef NBD_H_LINUX
00042 #include <linux/nbd.h>
00043 #endif // NBD_H_LINUX
00044 #endif // NBD_H_LOCAL
00045 
00046 #if NBD_LFS==1
00047 #define _LARGEFILE_SOURCE
00048 #define _FILE_OFFSET_BITS 64
00049 #endif
00050 
00051 u64 cliserv_magic = 0x00420281861253LL;
00052 #define INIT_PASSWD "NBDMAGIC"
00053 
00054 #define INFO(a) do { } while(0)
00055 
00056 void setmysockopt(int sock)
00057 {
00058         int size = 1;
00059 #if 0
00060         if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(int)) < 0)
00061                  INFO("(no sockopt/1: %m)");
00062 #endif
00063 #ifdef  IPPROTO_TCP
00064         size = 1;
00065         if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &size, sizeof(int)) < 0)
00066                  INFO("(no sockopt/2: %m)");
00067 #endif
00068 #if 0
00069         size = 1024;
00070         if (setsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &size, sizeof(int)) < 0)
00071                  INFO("(no sockopt/3: %m)");
00072 #endif
00073 }
00074 
00075 void err(const char *s)
00076 {
00077         const int maxlen = 150;
00078         char s1[maxlen], *s2;
00079 
00080         strncpy(s1, s, maxlen);
00081         if ((s2 = strstr(s, "%m"))) {
00082                 strcpy(s1 + (s2 - s), strerror(errno));
00083                 s2 += 2;
00084                 strcpy(s1 + strlen(s1), s2);
00085         }
00086 #ifndef sun
00087         /* Solaris doesn't have %h in syslog */
00088         else if ((s2 = strstr(s, "%h"))) {
00089                 strcpy(s1 + (s2 - s), hstrerror(h_errno));
00090                 s2 += 2;
00091                 strcpy(s1 + strlen(s1), s2);
00092         }
00093 #endif
00094 
00095         s1[maxlen-1] = '\0';
00096 #ifdef ISSERVER
00097         syslog(LOG_ERR, "%s", s1);
00098 #else
00099         fprintf(stderr, "Error: %s\n", s1);
00100 #endif
00101         exit(1);
00102 }
00103 
00104 void logging(void)
00105 {
00106 #ifdef ISSERVER
00107         openlog(MY_NAME, LOG_PID, LOG_DAEMON);
00108 #endif
00109         setvbuf(stdout, NULL, _IONBF, 0);
00110         setvbuf(stderr, NULL, _IONBF, 0);
00111 }
00112 
00113 #ifdef WORDS_BIGENDIAN
00114 u64 ntohll(u64 a)
00115 {
00116         return a;
00117 }
00118 #else
00119 u64 ntohll(u64 a)
00120 {
00121         u32 lo = a & 0xffffffff;
00122         u32 hi = a >> 32U;
00123         lo = ntohl(lo);
00124         hi = ntohl(hi);
00125         return ((u64) lo) << 32U | hi;
00126 }
00127 #endif
00128 #define htonll ntohll

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