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75ee4d9090
Add NSH commands for switching effective credentials and inspecting session identity. Update login and prompt to reflect effective user. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
131 lines
4.3 KiB
C
131 lines
4.3 KiB
C
/****************************************************************************
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* apps/nshlib/nsh_prompt.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#ifdef CONFIG_SCHED_USER_IDENTITY
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# include <unistd.h>
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#endif
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#include "nsh.h"
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/****************************************************************************
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* Preprocessor Macros
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****************************************************************************/
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#define NSH_PROMPT_SIZE (CONFIG_NSH_PROMPT_MAX + 1 - \
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sizeof(CONFIG_NSH_PROMPT_SUFFIX))
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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static char g_nshprompt[CONFIG_NSH_PROMPT_MAX] = CONFIG_NSH_PROMPT_STRING;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nsh_update_prompt
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*
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* Description:
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* This updates g_nshprompt from multiple sources, in the following order:
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*
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* - non-empty NSH_PROMPT_ENV variable and suffix
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* - non-empty NSH_PROMPT_STRING
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* - non-empty HOSTNAME and suffix
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*
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* When SCHED_USER_IDENTITY is enabled and NSH_PROMPT_STRING_ROOT or
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* NSH_PROMPT_STRING_USER are non-empty, the prompt for the current
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* effective UID replaces the value from the sources above.
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*
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* Note that suffix has higher priority when used to help clearly separate
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* prompts from command line inputs.
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*
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* Results:
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* - updated g_nsh_prompt value.
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*
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****************************************************************************/
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void nsh_update_prompt(void)
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{
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static_assert(CONFIG_NSH_PROMPT_MAX > sizeof(CONFIG_NSH_PROMPT_STRING),
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"NSH_PROMPT_STRING too long!");
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static_assert(CONFIG_NSH_PROMPT_MAX > sizeof(CONFIG_NSH_PROMPT_SUFFIX),
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"NSH_PROMPT_SUFFIX too long!");
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#ifndef CONFIG_DISABLE_ENVIRON
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if (getenv(CONFIG_NSH_PROMPT_ENV))
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{
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strlcpy(g_nshprompt, getenv(CONFIG_NSH_PROMPT_ENV), NSH_PROMPT_SIZE);
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strcat(g_nshprompt, CONFIG_NSH_PROMPT_SUFFIX);
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}
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else
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#endif
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if (CONFIG_NSH_PROMPT_STRING[0])
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{
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strcpy(g_nshprompt, CONFIG_NSH_PROMPT_STRING);
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}
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else
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{
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gethostname(g_nshprompt, NSH_PROMPT_SIZE);
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strcat(g_nshprompt, CONFIG_NSH_PROMPT_SUFFIX);
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}
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#ifdef CONFIG_SCHED_USER_IDENTITY
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if (geteuid() == 0)
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{
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if (CONFIG_NSH_PROMPT_STRING_ROOT[0] != '\0')
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{
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strlcpy(g_nshprompt, CONFIG_NSH_PROMPT_STRING_ROOT,
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CONFIG_NSH_PROMPT_MAX);
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}
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}
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else if (CONFIG_NSH_PROMPT_STRING_USER[0] != '\0')
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{
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strlcpy(g_nshprompt, CONFIG_NSH_PROMPT_STRING_USER,
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CONFIG_NSH_PROMPT_MAX);
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}
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#endif
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}
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/****************************************************************************
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* Name: nsh_prompt
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*
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* Description:
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* This function returns latest prompt string.
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* It is needed as g_nshprompt is no longer public.
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*
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****************************************************************************/
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FAR const char *nsh_prompt(void)
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{
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return g_nshprompt;
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}
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