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/*
* parse_dev.c -- parse device name into hostname and export path
*
* Copyright (C) 2008 Oracle. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 0211-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "xcommon.h"
#include "nls.h"
#include "parse_dev.h"
#ifndef NFS_MAXHOSTNAME
#define NFS_MAXHOSTNAME (255)
#endif
#ifndef NFS_MAXPATHNAME
#define NFS_MAXPATHNAME (1024)
#endif
extern char *progname;
extern int verbose;
static int nfs_pdn_no_devname_err(void)
{
nfs_error(_("%s: no device name was provided"), progname);
return 0;
}
static int nfs_pdn_hostname_too_long_err(void)
{
nfs_error(_("%s: server hostname is too long"), progname);
return 0;
}
static int nfs_pdn_pathname_too_long_err(void)
{
nfs_error(_("%s: export pathname is too long"), progname);
return 0;
}
static int nfs_pdn_bad_format_err(void)
{
nfs_error(_("%s: remote share not in 'host:dir' format"), progname);
return 0;
}
static int nfs_pdn_nomem_err(void)
{
nfs_error(_("%s: no memory available to parse devname"), progname);
return 0;
}
static int nfs_pdn_missing_brace_err(void)
{
nfs_error(_("%s: closing bracket missing from server address"),
progname);
return 0;
}
/*
* Standard hostname:path format
*/
static int nfs_parse_simple_hostname(const char *dev,
char **hostname, char **pathname)
{
size_t host_len, path_len;
char *colon, *comma;
/* Must have a colon */
colon = strchr(dev, ':');
if (colon == NULL)
return nfs_pdn_bad_format_err();
*colon = '\0';
host_len = colon - dev;
if (host_len > NFS_MAXHOSTNAME)
return nfs_pdn_hostname_too_long_err();
/* If there's a comma before the colon, take only the
* first name in list */
comma = strchr(dev, ',');
if (comma != NULL) {
*comma = '\0';
host_len = comma - dev;
nfs_error(_("%s: warning: multiple hostnames not supported"),
progname);
} else
colon++;
path_len = strlen(colon);
if (path_len > NFS_MAXPATHNAME)
return nfs_pdn_pathname_too_long_err();
if (hostname) {
*hostname = strndup(dev, host_len);
if (*hostname == NULL)
return nfs_pdn_nomem_err();
}
if (pathname) {
*pathname = strndup(colon, path_len);
if (*pathname == NULL) {
free(*hostname);
return nfs_pdn_nomem_err();
}
}
return 1;
}
/*
* To handle raw IPv6 addresses (which contain colons), the
* server's address is enclosed in square brackets. Return
* what's between the brackets.
*
* There could be anything in between the brackets, but we'll
* let DNS resolution sort it out later.
*/
static int nfs_parse_square_bracket(const char *dev,
char **hostname, char **pathname)
{
size_t host_len, path_len;
char *cbrace;
dev++;
/* Must have a closing square bracket */
cbrace = strchr(dev, ']');
if (cbrace == NULL)
return nfs_pdn_missing_brace_err();
*cbrace = '\0';
host_len = cbrace - dev;
/* Must have a colon just after the closing bracket */
cbrace++;
if (*cbrace != ':')
return nfs_pdn_bad_format_err();
if (host_len > NFS_MAXHOSTNAME)
return nfs_pdn_hostname_too_long_err();
cbrace++;
path_len = strlen(cbrace);
if (path_len > NFS_MAXPATHNAME)
return nfs_pdn_pathname_too_long_err();
if (hostname) {
*hostname = strndup(dev, host_len);
if (*hostname == NULL)
return nfs_pdn_nomem_err();
}
if (pathname) {
*pathname = strndup(cbrace, path_len);
if (*pathname == NULL) {
free(*hostname);
return nfs_pdn_nomem_err();
}
}
return 1;
}
/*
* RFC 2224 says an NFS client must grok "public file handles" to
* support NFS URLs. Linux doesn't do that yet. Print a somewhat
* helpful error message in this case instead of pressing forward
* with the mount request and failing with a cryptic error message
* later.
*/
static int nfs_parse_nfs_url(__attribute__((unused)) const char *dev,
__attribute__((unused)) char **hostname,
__attribute__((unused)) char **pathname)
{
nfs_error(_("%s: NFS URLs are not supported"), progname);
return 0;
}
/**
* nfs_parse_devname - Determine the server's hostname by looking at "devname".
* @devname: pointer to mounted device name (first argument of mount command)
* @hostname: OUT: pointer to server's hostname
* @pathname: OUT: pointer to export path on server
*
* Returns 1 if succesful, or zero if some error occurred. On success,
* @hostname and @pathname point to dynamically allocated buffers containing
* the hostname of the server and the export pathname (both '\0'-terminated).
*
* @hostname or @pathname may be NULL if caller doesn't want a copy of those
* parts of @devname.
*
* Note that this will not work if @devname is a wide-character string.
*/
int nfs_parse_devname(const char *devname,
char **hostname, char **pathname)
{
char *dev;
int result;
if (devname == NULL)
return nfs_pdn_no_devname_err();
/* Parser is destructive, so operate on a copy of the device name. */
dev = strdup(devname);
if (dev == NULL)
return nfs_pdn_nomem_err();
if (*dev == '[')
result = nfs_parse_square_bracket(dev, hostname, pathname);
else if (strncmp(dev, "nfs://", 6) == 0)
result = nfs_parse_nfs_url(dev, hostname, pathname);
else
result = nfs_parse_simple_hostname(dev, hostname, pathname);
free(dev);
return result;
}
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