/*
* Copyright (c) 2011 Jiri Zarevucky
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup libposix
* @{
*/
/** @file Password handling.
*/
#include <stdbool.h>
#include <pwd.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
static bool entry_read = false;
/* dummy user account */
static const struct passwd dummy_pwd = {
.pw_name = (char *) "user",
.pw_uid = 0,
.pw_gid = 0,
.pw_dir = (char *) "/",
.pw_shell = (char *) "/app/bdsh"
};
/**
* Retrieve next broken-down entry from the user database.
*
* Since HelenOS doesn't have user accounts, this always returns
* the same made-up entry.
*
* @return Next user database entry or NULL if not possible. Since HelenOS
* doesn't have user accounts, this always returns the same made-up entry.
*/
struct passwd *getpwent(void)
{
if (entry_read) {
return NULL;
}
entry_read = true;
return (struct passwd *) &dummy_pwd;
}
/**
* Rewind the user list.
*/
void setpwent(void)
{
entry_read = false;
}
/**
* Ends enumerating and releases all resources. (Noop)
*/
void endpwent(void)
{
/* noop */
}
/**
* Find an entry by name.
*
* @param name Name of the entry.
* @return Either found entry or NULL if no such entry exists.
*/
struct passwd *getpwnam(const char *name)
{
assert(name != NULL);
if (strcmp(name, "user") != 0) {
return NULL;
}
return (struct passwd *) &dummy_pwd;
}
/**
* Find an entry by name, thread safely.
*
* @param name Name of the entry.
* @param pwd Original structure.
* @param buffer Buffer for the strings referenced from the result structure.
* @param bufsize Length of the buffer.
* @param result Where to store updated structure.
* @return Zero on success (either found or not found, but without an error),
* non-zero error number if error occured.
*/
int getpwnam_r(const char *name, struct passwd *pwd,
char *buffer, size_t bufsize, struct passwd **result)
{
assert(name != NULL);
assert(pwd != NULL);
assert(buffer != NULL);
assert(result != NULL);
if (strcmp(name, "user") != 0) {
*result = NULL;
return 0;
}
return getpwuid_r(0, pwd, buffer, bufsize, result);
}
/**
* Find an entry by UID.
*
* @param uid UID of the entry.
* @return Either found entry or NULL if no such entry exists.
*/
struct passwd *getpwuid(uid_t uid)
{
if (uid != 0) {
return NULL;
}
return (struct passwd *) &dummy_pwd;
}
/**
* Find an entry by UID, thread safely.
*
* @param uid UID of the entry.
* @param pwd Original structure.
* @param buffer Buffer for the strings referenced from the result structure.
* @param bufsize Length of the buffer.
* @param result Where to store updated structure.
* @return Zero on success (either found or not found, but without an error),
* non-zero error number if error occured.
*/
int getpwuid_r(uid_t uid, struct passwd *pwd,
char *buffer, size_t bufsize, struct passwd **result)
{
assert(pwd != NULL);
assert(buffer != NULL);
assert(result != NULL);
static const char bf[] = { 'u', 's', 'e', 'r', '\0',
'/', '\0', 'b', 'd', 's', 'h', '\0' };
if (uid != 0) {
*result = NULL;
return 0;
}
if (bufsize < sizeof(bf)) {
*result = NULL;
return ERANGE;
}
memcpy(buffer, bf, sizeof(bf));
pwd->pw_name = (char *) bf;
pwd->pw_uid = 0;
pwd->pw_gid = 0;
pwd->pw_dir = (char *) bf + 5;
pwd->pw_shell = (char *) bf + 7;
*result = (struct passwd *) pwd;
return 0;
}
/** @}
*/