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nuttx-apps/examples/uid/uid_main.c

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/****************************************************************************
* examples/uid/uid_main.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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pwd.h>
#include <grp.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
#define IOBUFFER_SIZE (196)
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* show_usage
****************************************************************************/
static void show_usage(FAR const char *progname, FAR FILE *stream,
int exit_code)
{
fprintf(stream, "USAGE:\n");
fprintf(stream, "\t%s -uid <uid> - Show user info by ID\n", progname);
fprintf(stream, "\t%s -uname <name> - Show user info by name\n", progname);
fprintf(stream, "\t%s -gid <gid> - Show group info by ID\n", progname);
fprintf(stream, "\t%s -gname <name> - Show group info by name\n", progname);
fprintf(stream, "\t%s -h - Show this help info\n", progname);
exit(exit_code);
}
/****************************************************************************
* show_pwd
****************************************************************************/
static void show_pwd(FAR struct passwd *pwd)
{
printf("Name: %s\n", pwd->pw_name);
printf("UID: %d\n", pwd->pw_uid);
printf("GID: %d\n", pwd->pw_gid);
printf("Home: %s\n", pwd->pw_dir);
printf("Shell: %s\n", pwd->pw_shell);
}
/****************************************************************************
* show_grp
****************************************************************************/
static void show_grp(FAR struct group *grp)
{
printf("Name: %s\n", grp->gr_name);
printf("Passwd: %s\n", grp->gr_passwd);
printf("GID: %d\n", grp->gr_gid);
printf("Members: ");
if (grp->gr_mem != NULL)
{
bool first = true;
int i;
for (i = 0; grp->gr_mem[i] != NULL; i++)
{
if (first)
{
printf("%s", grp->gr_mem[i]);
first = false;
}
else
{
printf(", %s", grp->gr_mem[i]);
}
}
putchar('\n');
}
}
/****************************************************************************
* show_user_by_id
****************************************************************************/
static void show_user_by_id(uid_t uid)
{
FAR struct passwd *result;
struct passwd pwd;
char buffer[IOBUFFER_SIZE];
int ret;
ret = getpwuid_r(uid, &pwd, buffer, IOBUFFER_SIZE, &result);
if (ret != 0)
{
fprintf(stderr, "ERPOR: getpwuid_r failed: %d\n", ret);
}
else if (result == NULL)
{
fprintf(stderr, "No such user ID: %d\n", uid);
}
else
{
show_pwd(&pwd);
}
}
/****************************************************************************
* show_user_by_name
****************************************************************************/
static void show_user_by_name(FAR const char *uname)
{
FAR struct passwd *result;
struct passwd pwd;
char buffer[IOBUFFER_SIZE];
int ret;
ret = getpwnam_r(uname, &pwd, buffer, IOBUFFER_SIZE, &result);
if (ret != 0)
{
fprintf(stderr, "ERPOR: getpwnam_r failed: %d\n", ret);
}
else if (result == NULL)
{
fprintf(stderr, "No such user name: %s\n", uname);
}
else
{
show_pwd(&pwd);
}
}
/****************************************************************************
* show_group_by_id
****************************************************************************/
static void show_group_by_id(gid_t gid)
{
FAR struct group *result;
struct group grp;
char buffer[IOBUFFER_SIZE];
int ret;
ret = getgrgid_r(gid, &grp, buffer, IOBUFFER_SIZE, &result);
if (ret != 0)
{
fprintf(stderr, "ERPOR: getgrgid_r failed: %d\n", ret);
}
else if (result == NULL)
{
fprintf(stderr, "No such group ID: %d\n", gid);
}
else
{
show_grp(&grp);
}
}
/****************************************************************************
* show_group_by_name
****************************************************************************/
static void show_group_by_name(FAR const char *gname)
{
FAR struct group *result;
struct group grp;
char buffer[IOBUFFER_SIZE];
int ret;
ret = getgrnam_r(gname, &grp, buffer, IOBUFFER_SIZE, &result);
if (ret != 0)
{
fprintf(stderr, "ERPOR: getgrnam_r failed: %d\n", ret);
}
else if (result == NULL)
{
fprintf(stderr, "No such group name: %s\n", gname);
}
else
{
show_grp(&grp);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* uid_main
****************************************************************************/
int main(int argc, FAR char *argv[])
{
if (argc < 2)
{
fprintf(stderr, "ERROR: Missing options\n");
show_usage(argv[0], stderr, EXIT_FAILURE);
}
/* Check for help */
if (strcmp(argv[1], "-h") == 0)
{
if (argc != 2)
{
fprintf(stderr,
"ERROR: Invalid number of arguments for help: %d\n",
argc - 1);
show_usage(argv[0], stderr, EXIT_FAILURE);
}
show_usage(argv[0], stdout, EXIT_SUCCESS);
}
if (argc != 3)
{
fprintf(stderr, "ERROR: Invalid number of arguments: %d\n",
argc - 1);
show_usage(argv[0], stderr, EXIT_FAILURE);
}
if (strcmp(argv[1], "-uid") == 0)
{
int uid = atoi(argv[2]);
show_user_by_id((uid_t)uid);
}
else if (strcmp(argv[1], "-uname") == 0)
{
show_user_by_name(argv[2]);
}
else if (strcmp(argv[1], "-gid") == 0)
{
int gid = atoi(argv[2]);
show_group_by_id((gid_t)gid);
}
else if (strcmp(argv[1], "-gname") == 0)
{
show_group_by_name(argv[2]);
}
else
{
fprintf(stderr, "ERROR: Unrecognized option: %s\n", argv[1]);
show_usage(argv[0], stderr, EXIT_FAILURE);
}
return EXIT_SUCCESS;
}
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