352 lines
10 KiB
C
352 lines
10 KiB
C
/****************************************************************************
|
|
* libs/libc/grp/lib_find_grpfile.c
|
|
*
|
|
* Copyright (C) 2019 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <grp.h>
|
|
#include <assert.h>
|
|
|
|
#include "grp/lib_grp.h"
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
typedef CODE int (grp_foreach_match_t)(FAR const struct group *entry,
|
|
uintptr_t arg);
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: grp_match_name
|
|
*
|
|
* Description:
|
|
* Called for each record in the group file. Returns "1" if the record
|
|
* matches the group name (passed as arg)
|
|
*
|
|
* Input Parameters:
|
|
* entry - The parsed group file record
|
|
* arg - A pointer to the group name to match
|
|
*
|
|
* Returned Value:
|
|
* < 0 : An error has occurred.
|
|
* = 0 : No entry name does not match.
|
|
* = 1 : The entry name matches
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int grp_match_name(FAR const struct group *entry, uintptr_t arg)
|
|
{
|
|
FAR const char *gname = (FAR const char *)arg;
|
|
return strcmp(entry->gr_name, gname) == 0 ? 1 : 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: grp_match_gid
|
|
*
|
|
* Description:
|
|
* Called for each record in the group file. Returns "1" if the record
|
|
* matches the group ID (passed as arg)
|
|
*
|
|
* Input Parameters:
|
|
* entry - The parsed group file record
|
|
* arg - The group ID to match
|
|
*
|
|
* Returned Value:
|
|
* < 0 : An error has occurred.
|
|
* = 0 : No entry name does not match.
|
|
* = 1 : The entry name matches
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int grp_match_gid(FAR const struct group *entry, uintptr_t arg)
|
|
{
|
|
int match_gid = (int)arg;
|
|
return match_gid == entry->gr_gid ? 1 : 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: grp_foreach
|
|
*
|
|
* Description:
|
|
* Visit each record in group file.
|
|
*
|
|
* Input Parameters:
|
|
* match - The match function to call on each record
|
|
* arg - Argument passed to the match function
|
|
* entry - Location to return the parsed group file entry
|
|
* buffer - I/O buffer used to access the group file
|
|
* buflen - The size of the I/O buffer in bytes
|
|
*
|
|
* Returned Value:
|
|
* < 0 : An error has occurred.
|
|
* = 0 : No entry with this name was found.
|
|
* = 1 : The entry with this name was found.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int grp_foreach(grp_foreach_match_t match, uintptr_t arg,
|
|
FAR struct group *entry, FAR char *buffer,
|
|
size_t buflen)
|
|
{
|
|
FAR FILE *stream;
|
|
FAR char *ptr;
|
|
FAR char *line;
|
|
FAR char *save;
|
|
size_t linelen;
|
|
unsigned int nmembers;
|
|
int ret;
|
|
|
|
stream = fopen(CONFIG_LIBC_GROUP_FILEPATH, "r");
|
|
if (stream == NULL)
|
|
{
|
|
int errcode = get_errno();
|
|
DEBUGASSERT(errcode > 0);
|
|
return -errcode;
|
|
}
|
|
|
|
/* Read the password file line by line until the record with the matching
|
|
* username is found, or until the end of the file is reached.
|
|
*
|
|
* The format of the password file is:
|
|
*
|
|
* user:x:uid:gid:home
|
|
*
|
|
* Where:
|
|
* user: User name
|
|
* x: Encrypted password
|
|
* uid: User ID
|
|
* gid: Group ID
|
|
* home: Login directory
|
|
*/
|
|
|
|
DEBUGASSERT(buflen > MEMBER_SIZE); /* Buffer must also be aligned */
|
|
line = buffer + MEMBER_SIZE;
|
|
linelen = buflen - MEMBER_SIZE;
|
|
|
|
while (fgets(line, linelen, stream) != NULL)
|
|
{
|
|
ptr = line;
|
|
entry->gr_name = ptr;
|
|
|
|
/* Skip to the end of the name and properly terminate it. The name
|
|
* must be terminated with the field delimiter ':'.
|
|
*/
|
|
|
|
for (; *ptr != '\n' && *ptr != '\0' && *ptr != ':'; ptr++)
|
|
{
|
|
}
|
|
|
|
if (*ptr == '\n' || *ptr == '\0')
|
|
{
|
|
/* Bad line format? */
|
|
|
|
continue;
|
|
}
|
|
|
|
*ptr++ = '\0';
|
|
entry->gr_passwd = ptr;
|
|
|
|
/* Skip to the end of the password and properly terminate it. The
|
|
* password must be terminated with the field delimiter ':'.
|
|
*/
|
|
|
|
for (; *ptr != '\n' && *ptr != '\0' && *ptr != ':'; ptr++)
|
|
{
|
|
}
|
|
|
|
if (*ptr == '\n' || *ptr == '\0')
|
|
{
|
|
/* Bad line format? */
|
|
|
|
continue;
|
|
}
|
|
|
|
*ptr++ = '\0';
|
|
save = ptr;
|
|
|
|
/* Skip to the end of the group ID and properly terminate it. The
|
|
* group ID must be terminated with the field delimiter ':'.
|
|
*/
|
|
|
|
for (; *ptr != '\n' && *ptr != '\0' && *ptr != ':'; ptr++)
|
|
{
|
|
}
|
|
|
|
if (*ptr == '\n' || *ptr == '\0')
|
|
{
|
|
/* Bad line format? */
|
|
|
|
continue;
|
|
}
|
|
|
|
*ptr++ = '\0';
|
|
entry->gr_gid = (gid_t)atoi(save);
|
|
|
|
/* This is followed by a variable number of user names. The ':'
|
|
* delimited will be followed by '\n' or '\0' if there are no users
|
|
* in the group
|
|
*/
|
|
|
|
nmembers = 0;
|
|
entry->gr_mem = (FAR char **)buffer;
|
|
|
|
if (*ptr != '\n' && *ptr != '\0')
|
|
{
|
|
for (; ; )
|
|
{
|
|
/* Add the next user name */
|
|
|
|
entry->gr_mem[nmembers] = ptr;
|
|
nmembers++;
|
|
if (nmembers >= CONFIG_LIBC_GROUP_NUSERS)
|
|
{
|
|
break;
|
|
}
|
|
|
|
/* Skip to the end of the user name and properly terminate it.
|
|
* The user name must be terminated with either (1) ','
|
|
* meaning that another user name is present, or (2) '\n' or
|
|
* '\0' meaning that we have reached the end of the line and
|
|
* there are no further user names.
|
|
*/
|
|
|
|
for (; *ptr != '\n' && *ptr != '\0' && *ptr != ','; ptr++)
|
|
{
|
|
}
|
|
|
|
if (*ptr == '\n' || *ptr == '\0')
|
|
{
|
|
*ptr = '\0';
|
|
break;
|
|
}
|
|
|
|
*ptr++ = '\0';
|
|
}
|
|
}
|
|
|
|
/* The list terminates with a NULL pointer */
|
|
|
|
entry->gr_mem[nmembers] = NULL;
|
|
|
|
/* Check for a match */
|
|
|
|
ret = match(entry, arg);
|
|
if (ret != 0)
|
|
{
|
|
/* We either have the match or an error occurred. */
|
|
|
|
fclose(stream);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
fclose(stream);
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: grp_findby_name
|
|
*
|
|
* Description:
|
|
* Find group file entry using the group name.
|
|
*
|
|
* Input Parameters:
|
|
* gname - The group name
|
|
* entry - Location to return the parsed group file entry
|
|
* buffer - I/O buffer used to access the group file
|
|
* buflen - The size of the I/O buffer in bytes
|
|
*
|
|
* Returned Value:
|
|
* < 0 : An error has occurred.
|
|
* = 0 : No entry with this name was found.
|
|
* = 1 : The entry with this name was found.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int grp_findby_name(FAR const char *gname, FAR struct group *entry,
|
|
FAR char *buffer, size_t buflen)
|
|
{
|
|
return grp_foreach(grp_match_name, (uintptr_t)gname, entry, buffer, buflen);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: grp_findby_gid
|
|
*
|
|
* Description:
|
|
* Find group file entry using the group ID.
|
|
*
|
|
* Input Parameters:
|
|
* gid - The group ID
|
|
* entry - Location to return the parsed group file entry
|
|
* buffer - I/O buffer used to access the group file
|
|
* buflen - The size of the I/O buffer in bytes
|
|
*
|
|
* Returned Value:
|
|
* < 0 : An error has occurred.
|
|
* = 0 : No entry with this name was found.
|
|
* = 1 : The entry with this name was found.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int grp_findby_gid(gid_t gid, FAR struct group *entry, FAR char *buffer,
|
|
size_t buflen)
|
|
{
|
|
/* Verify that the GID is in the valid range of 0 through INT16_MAX.
|
|
* OpenGroup.org does not specify a GID_MAX or GID_MIN. Instead we use a
|
|
* priori knowledge that gid_t is type int16_t.
|
|
*/
|
|
|
|
if ((uint16_t)gid > INT16_MAX)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
return grp_foreach(grp_match_gid, (uintptr_t)gid, entry, buffer, buflen);
|
|
}
|