smbw.c

samba-3.0.22.tar.gz 编译smb服务器的源码

}

/***************************************************** 
a wrapper for pwrite()
*******************************************************/
ssize_t smbw_pwrite(int smbw_fd, void *buf, size_t count, SMBW_OFF_T ofs)
{
        int saved_errno;
        int client_fd;
	ssize_t ret;
        SMBW_OFF_T old_ofs;
        
        if (count == 0) {
                return 0;
        }

        client_fd = smbw_fd_map[smbw_fd];

        if ((old_ofs = smbc_lseek(client_fd, 0, SEEK_CUR)) < 0 ||
            smbc_lseek(client_fd, ofs, SEEK_SET) < 0) {
                return -1;
        }

        if ((ret = smbc_write(client_fd, buf, count)) < 0) {
                saved_errno = errno;
                (void) smbc_lseek(client_fd, old_ofs, SEEK_SET);
                errno = saved_errno;
                return -1;
        }

        return ret;
}

/***************************************************** 
a wrapper for close()
*******************************************************/
int smbw_close(int smbw_fd)
{
        int client_fd;

        client_fd = smbw_fd_map[smbw_fd];

        if (smbw_ref(client_fd, SMBW_RCT_Decrement) > 0) {
                return 0;
        }
        
        (* smbw_libc.close)(smbw_fd);
        smbw_fd_map[smbw_fd] = -1;
        return smbc_close(client_fd);
}


/***************************************************** 
a wrapper for fcntl()
*******************************************************/
int smbw_fcntl(int smbw_fd, int cmd, long arg)
{
	return 0;
}


/***************************************************** 
a wrapper for access()
*******************************************************/
int smbw_access(const char *name, int mode)
{
	struct SMBW_stat st;

        SMBW_INIT();

	if (smbw_stat(name, &st)) return -1;

	if (((mode & R_OK) && !(st.s_mode & S_IRUSR)) ||
	    ((mode & W_OK) && !(st.s_mode & S_IWUSR)) ||
	    ((mode & X_OK) && !(st.s_mode & S_IXUSR))) {
		errno = EACCES;
		return -1;
	}
	
	return 0;
}

/***************************************************** 
a wrapper for readlink() - needed for correct errno setting
*******************************************************/
int smbw_readlink(const char *fname, char *buf, size_t bufsize)
{
	struct SMBW_stat st;
	int ret;

        SMBW_INIT();

	ret = smbw_stat(fname, &st);
	if (ret != 0) {
		return -1;
	}
	
	/* it exists - say it isn't a link */
	errno = EINVAL;
	return -1;
}


/***************************************************** 
a wrapper for unlink()
*******************************************************/
int smbw_unlink(const char *fname)
{
        char path[PATH_MAX];
        
        SMBW_INIT();

        smbw_fix_path(fname, path);
        return smbc_unlink(path);
}


/***************************************************** 
a wrapper for rename()
*******************************************************/
int smbw_rename(const char *oldname, const char *newname)
{
        char path_old[PATH_MAX];
        char path_new[PATH_MAX];

        SMBW_INIT();

        smbw_fix_path(oldname, path_old);
        smbw_fix_path(newname, path_new);
        return smbc_rename(path_old, path_new);
}


/***************************************************** 
a wrapper for utimes
*******************************************************/
int smbw_utimes(const char *fname, void *buf)
{
        char path[PATH_MAX];

        smbw_fix_path(fname, path);
	return smbc_utimes(path, buf);
}


/***************************************************** 
a wrapper for utime 
*******************************************************/
int smbw_utime(const char *fname, void *buf)
{
        char path[PATH_MAX];

        smbw_fix_path(fname, path);
        return smbc_utime(path, buf);
}

/***************************************************** 
a wrapper for chown()
*******************************************************/
int smbw_chown(const char *fname, uid_t owner, gid_t group)
{
        /* always indiciate that this is not supported. */
        errno = ENOTSUP;
        return -1;
}

/***************************************************** 
a wrapper for chmod()
*******************************************************/
int smbw_chmod(const char *fname, mode_t newmode)
{
        char path[PATH_MAX];

        smbw_fix_path(fname, path);
        return smbc_chmod(path, newmode);
}


/***************************************************** 
a wrapper for lseek()
*******************************************************/
SMBW_OFF_T smbw_lseek(int smbw_fd,
                      SMBW_OFF_T offset,
                      int whence)
{
        int client_fd;
        SMBW_OFF_T ret;
        
        client_fd = smbw_fd_map[smbw_fd];

        ret = smbc_lseek(client_fd, offset, whence);
        if (smbw_debug)
        {
                printf("smbw_lseek(%d/%d, 0x%llx) returned 0x%llx\n",
                       smbw_fd, client_fd,
                       (unsigned long long) offset,
                       (unsigned long long) ret);
        }
        return ret;
}

/***************************************************** 
a wrapper for dup()
*******************************************************/
int smbw_dup(int smbw_fd)
{
	int fd2;

	fd2 = (smbw_libc.dup)(smbw_fd);
	if (fd2 == -1) {
                return -1;
	}

        smbw_fd_map[fd2] = smbw_fd_map[smbw_fd];
        smbw_ref(smbw_fd_map[smbw_fd], SMBW_RCT_Increment);
	return fd2;
}


/***************************************************** 
a wrapper for dup2()
*******************************************************/
int smbw_dup2(int smbw_fd, int fd2)
{
	if ((* smbw_libc.dup2)(smbw_fd, fd2) != fd2) {
                return -1;
	}

        smbw_fd_map[fd2] = smbw_fd_map[smbw_fd];
        smbw_ref(smbw_fd_map[smbw_fd], SMBW_RCT_Increment);
	return fd2;
}


/***************************************************** 
when we fork we have to close all connections and files
in the child
*******************************************************/
int smbw_fork(void)
{
        int i;
	pid_t child_pid;
	int p[2];
	char c = 0;

        SMBW_INIT();

	if (pipe(p)) return (* smbw_libc.fork)();

	child_pid = (* smbw_libc.fork)();

	if (child_pid) {
		/* block the parent for a moment until the sockets are
                   closed */
		(* smbw_libc.close)(p[1]);
		(* smbw_libc.read)(p[0], &c, 1);
		(* smbw_libc.close)(p[0]);
		return child_pid;
        }

	(* smbw_libc.close)(p[0]);

        /* close all server connections and locally-opened files */
        for (i = 0; i < __FD_SETSIZE; i++) {
                if (smbw_fd_map[i] > 0 &&
                    smbw_ref(smbw_fd_map[i], SMBW_RCT_Get) > 0) {
                        
                        smbc_close(smbw_fd_map[i]);
                        smbw_ref(smbw_fd_map[i], SMBW_RCT_Set, 0);
                        (* smbw_libc.close)(i);
                }

                smbw_fd_map[i] = -1;
        }

	/* unblock the parent */
	write(p[1], &c, 1);
	(* smbw_libc.close)(p[1]);

        /* specify directory to start in, if it's simulated smb */
        if (*smbw_cwd != '\0') {
                setenv("SMBW_DIR", smbw_cwd, 1);
        } else {
                unsetenv("SMBW_DIR");
        }

        /* Re-initialize this library for the child */
        do_init(StartupType_Fake);

	/* and continue in the child */
	return 0;
}

int smbw_setxattr(const char *fname,
                  const char *name,
                  const void *value,
                  size_t size,
                  int flags)
{
        char path[PATH_MAX];

        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        smbw_fix_path(fname, path);
        return smbc_setxattr(path, name, value, size, flags);
}

int smbw_lsetxattr(const char *fname,
                   const char *name,
                   const void *value,
                   size_t size,
                   int flags)
{
        char path[PATH_MAX];

        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        smbw_fix_path(fname, path);
        return smbc_lsetxattr(path, name, value, size, flags);
}

int smbw_fsetxattr(int smbw_fd,
                   const char *name,
                   const void *value,
                   size_t size,
                   int flags)
{
        int client_fd;
        
        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        client_fd = smbw_fd_map[smbw_fd];
        return smbc_fsetxattr(client_fd, name, value, size, flags);
}

int smbw_getxattr(const char *fname,
                  const char *name,
                  const void *value,
                  size_t size)
{
        char path[PATH_MAX];

        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        smbw_fix_path(fname, path);

        return smbc_getxattr(path, name, value, size);
}

int smbw_lgetxattr(const char *fname,
                   const char *name,
                   const void *value,
                   size_t size)
{
        char path[PATH_MAX];

        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        smbw_fix_path(fname, path);
        return smbc_lgetxattr(path, name, value, size);
}

int smbw_fgetxattr(int smbw_fd,
                   const char *name,
                   const void *value,
                   size_t size)
{
        int client_fd;
        
        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        client_fd = smbw_fd_map[smbw_fd];
        return smbc_fgetxattr(client_fd, name, value, size);
}

int smbw_removexattr(const char *fname,
                     const char *name)
{
        char path[PATH_MAX];

        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        smbw_fix_path(fname, path);
        return smbc_removexattr(path, name);
}

int smbw_lremovexattr(const char *fname,
                      const char *name)
{
        char path[PATH_MAX];

        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        smbw_fix_path(fname, path);
        return smbc_lremovexattr(path, name);
}

int smbw_fremovexattr(int smbw_fd,
                      const char *name)
{
        int client_fd;
        
        if (strcmp(name, "system.posix_acl_access") == 0)
        {
                name = "system.*";
        }

        client_fd = smbw_fd_map[smbw_fd];
        return smbc_fremovexattr(client_fd, name);
}

int smbw_listxattr(const char *fname,
                   char *list,
                   size_t size)
{
        char path[PATH_MAX];

        smbw_fix_path(fname, path);
        return smbc_listxattr(path, list, size);
}

int smbw_llistxattr(const char *fname,
                    char *list,
                    size_t size)
{
        char path[PATH_MAX];

        smbw_fix_path(fname, path);
        return smbc_llistxattr(path, list, size);
}

int smbw_flistxattr(int smbw_fd,
                    char *list,
                    size_t size)
{
        int client_fd;
        
        client_fd = smbw_fd_map[smbw_fd];
        return smbc_flistxattr(client_fd, list, size);
}