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/*
Copyright (C) 2001,2002,2009,2012 Bernhard R. Link <brlink@debian.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Please tell me, if you find errors or mistakes.
Based on parts of the GNU C Library:
Common code for file-based database parsers in nss_files module.
Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
*/
#define _GNU_SOURCE 1
#include <stdlib.h>
#include <stdio.h>
#include <nss.h>
#include <string.h>
#include <shadow.h>
#include <time.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include "s_config.h"
enum nss_status _nss_extrausers_getspent_r(struct spwd *, char *, size_t, int *);
enum nss_status _nss_extrausers_getspnam_r(const char *, struct spwd *, char *, size_t, int *);
enum nss_status _nss_extrausers_setspent(void);
enum nss_status _nss_extrausers_endspent(void);
static enum nss_status shadow_search(FILE *stream, const char *name, struct spwd *spw, char *buffer, size_t buflen, int *errnop);
enum nss_status _nss_extrausers_getspnam_r(const char *name, struct spwd *spw, char *buffer, size_t buflen, int *errnop) {
FILE *stream;
enum nss_status s;
if (spw == NULL || name == NULL)
{
*errnop = EPERM;
return NSS_STATUS_UNAVAIL;
}
stream = fopen(SHADOWFILE, "re");
if( stream == NULL ) {
*errnop = errno;
return *errnop == ENOMEM ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
}
flockfile(stream);
s = shadow_search(stream, name, spw, buffer, buflen, errnop);
funlockfile(stream);
fclose(stream);
return s;
}
static FILE *shadowfile = NULL;
enum nss_status _nss_extrausers_setspent(void) {
if (shadowfile != NULL) {
fclose(shadowfile);
shadowfile = NULL;
}
shadowfile = fopen(SHADOWFILE, "r");
if (shadowfile == NULL) {
return NSS_STATUS_UNAVAIL;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_extrausers_endspent(void) {
if (shadowfile != NULL) {
fclose(shadowfile);
shadowfile = NULL;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status _nss_extrausers_getspent_r(struct spwd *spw, char *buffer, size_t buflen, int *errnop) {
enum nss_status s;
if (spw == NULL) {
*errnop = EPERM;
return NSS_STATUS_UNAVAIL;
}
if (shadowfile == NULL) {
shadowfile = fopen(SHADOWFILE, "r");
if( shadowfile == NULL ) {
*errnop = errno;
return NSS_STATUS_UNAVAIL;
}
}
flockfile(shadowfile);
s = shadow_search(shadowfile, NULL, spw, buffer, buflen, errnop);
funlockfile(shadowfile);
return s;
}
static enum nss_status shadow_search(FILE *stream, const char *name, struct spwd *spw, char *buffer, size_t buflen, int *errnop) {
#define CHECKCOLON if(*p != ':' ) { \
*errnop = 0; \
return NSS_STATUS_UNAVAIL; \
} else { \
*(p++) = '\0'; \
}
#define TOCOLON(p, h) { while( *p && *p != ':' ) p++; CHECKCOLON }
char *p, *h;
char *t_namp, *t_pwdp;
long int t_lstchg, t_min, t_max, t_warn, t_inact, t_expire;
unsigned long int t_flag;
while( 1 ) {
buffer[buflen - 1] = '\xff';
p = fgets_unlocked(buffer, buflen, stream);
if( p == NULL ) {
if( feof_unlocked(stream) ) {
*errnop = ENOENT;
return NSS_STATUS_NOTFOUND;
} else {
*errnop = errno;
return NSS_STATUS_UNAVAIL;
}
}
h = index(p, '\n');
if( buffer[buflen - 1] != '\xff' || h == NULL ) {
/* buffer too small */
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
while (h >= p && isspace(*h)) {
*h = '\0';
h--;
}
/* Ignore comments */
if( *p == '#')
continue;
/* extract name */
while (isspace(*p))
++p;
/* Ignore empty lines */
if (*p == '\0')
continue;
t_namp = p;
TOCOLON(p, h);
if( name && strcmp(name, t_namp) != 0 )
continue;
/* passwd */
while (isspace(*p))
++p;
t_pwdp = p;
TOCOLON(p, h);
/* extract day of last changes */
#define PARSE_NUMBER(var) \
if (*p == ':') { \
var = -1; \
*(p++) = '\0'; \
} else { \
var = strtol(p, &h, 10); \
p = h; \
CHECKCOLON; \
}
PARSE_NUMBER(t_lstchg);
/* extract min */
PARSE_NUMBER(t_min);
/* extract max */
PARSE_NUMBER(t_max);
/* extract days of warning */
PARSE_NUMBER(t_warn);
/* extract days of inactivity */
PARSE_NUMBER(t_inact);
/* extract day of expire */
PARSE_NUMBER(t_expire);
#undef PARSE_NUMBER
/* extract reserved flags */
t_flag = strtoul(p, &h, 10);
if( *h != '\0' ) {
*errnop = 0;
return NSS_STATUS_UNAVAIL;
} else if (p == h)
t_flag = -1;
*errnop = 0;
spw->sp_namp = t_namp;
spw->sp_pwdp = t_pwdp;
spw->sp_lstchg = t_lstchg;
spw->sp_min = t_min;
spw->sp_max = t_max;
spw->sp_warn = t_warn;
spw->sp_inact = t_inact;
spw->sp_expire = t_expire;
spw->sp_flag = t_flag;
return NSS_STATUS_SUCCESS;
}
}
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