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