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cliserv.h

/* This header file is shared by client & server. They really have
 * something to share...
 * */

/* Client/server protocol is as follows:
   Send INIT_PASSWD
   Send 64-bit cliserv_magic
   Send 64-bit size of exported device
   Send 128 bytes of zeros (reserved for future use)
 */

#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <netinet/tcp.h>
#include <stdlib.h>

#if SIZEOF_UNSIGNED_SHORT_INT==4
typedef unsigned short u32;
#elif SIZEOF_UNSIGNED_INT==4
typedef unsigned int u32;
#elif SIZEOF_UNSIGNED_LONG_INT==4
typedef unsigned long u32;
#else
#error I need at least some 32-bit type
#endif

#if SIZEOF_UNSIGNED_INT==8
typedef unsigned int u64;
#elif SIZEOF_UNSIGNED_LONG_INT==8
typedef unsigned long u64;
#elif SIZEOF_UNSIGNED_LONG_LONG_INT==8
typedef unsigned long long u64;
#else
#error I need at least some 64-bit type
#endif

#ifdef NBD_H_LOCAL
/* 2.6.18 and above use __be* rather than u* */
#define __be32 u32
#define __be64 u64
#include "nbd.h"
#endif
#ifdef NBD_H_LINUX
#include <linux/types.h>
#include <linux/nbd.h>
#endif

#if NBD_LFS==1
#define _LARGEFILE_SOURCE
#define _FILE_OFFSET_BITS 64
#endif

u64 cliserv_magic = 0x00420281861253LL;
#define INIT_PASSWD "NBDMAGIC"

#define INFO(a) do { } while(0)

void setmysockopt(int sock) {
      int size = 1;
#if 0
      if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &size, sizeof(int)) < 0)
             INFO("(no sockopt/1: %m)");
#endif
#ifdef      IPPROTO_TCP
      size = 1;
      if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &size, sizeof(int)) < 0)
             INFO("(no sockopt/2: %m)");
#endif
#if 0
      size = 1024;
      if (setsockopt(sock, IPPROTO_TCP, TCP_MAXSEG, &size, sizeof(int)) < 0)
             INFO("(no sockopt/3: %m)");
#endif
}

#ifndef G_GNUC_NORETURN
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
#define G_GNUC_NORETURN __attribute__((__noreturn__))
#else
#define G_GNUC_NORETURN
#endif
#endif

void err(const char *s) G_GNUC_NORETURN;

void err(const char *s) {
      const int maxlen = 150;
      char s1[maxlen], *s2;

      strncpy(s1, s, maxlen);
      if ((s2 = strstr(s, "%m"))) {
            strcpy(s1 + (s2 - s), strerror(errno));
            s2 += 2;
            strcpy(s1 + strlen(s1), s2);
      }
#ifndef     sun
      /* Solaris doesn't have %h in syslog */
      else if ((s2 = strstr(s, "%h"))) {
            strcpy(s1 + (s2 - s), hstrerror(h_errno));
            s2 += 2;
            strcpy(s1 + strlen(s1), s2);
      }
#endif

      s1[maxlen-1] = '\0';
#ifdef ISSERVER
      syslog(LOG_ERR, "%s", s1);
#endif
      fprintf(stderr, "Error: %s\n", s1);
      exit(1);
}

void logging(void) {
#ifdef ISSERVER
      openlog(MY_NAME, LOG_PID, LOG_DAEMON);
#endif
      setvbuf(stdout, NULL, _IONBF, 0);
      setvbuf(stderr, NULL, _IONBF, 0);
}

#ifdef WORDS_BIGENDIAN
u64 ntohll(u64 a) {
      return a;
}
#else
u64 ntohll(u64 a) {
      u32 lo = a & 0xffffffff;
      u32 hi = a >> 32U;
      lo = ntohl(lo);
      hi = ntohl(hi);
      return ((u64) lo) << 32U | hi;
}
#endif
#define htonll ntohll

/* Flags used between the client and server */
#define NBD_FLAG_HAS_FLAGS    (1 << 0)    /* Flags are there */
#define NBD_FLAG_READ_ONLY    (1 << 1)    /* Device is read-only */

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