busybox/libpwdgrp/pwd_grp_internal.c

/*  Copyright (C) 2003     Manuel Novoa III
 *
 *  Licensed under GPL v2, or later.  See file LICENSE in this tarball.
 */

/*  Nov 6, 2003  Initial version.
 *
 *  NOTE: This implementation is quite strict about requiring all
 *    field seperators.  It also does not allow leading whitespace
 *    except when processing the numeric fields.  glibc is more
 *    lenient.  See the various glibc difference comments below.
 *
 *  TODO:
 *    Move to dynamic allocation of (currently statically allocated)
 *      buffers; especially for the group-related functions since
 *      large group member lists will cause error returns.
 *
 */

#include <features.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <stddef.h>
#include <errno.h>
#include <assert.h>
#include <ctype.h>

#include "pwd_.h"
#include "grp_.h"
#include "shadow_.h"
#include "libbb.h"

#ifndef _PATH_SHADOW
#define	_PATH_SHADOW	"/etc/shadow"
#endif
#ifndef _PATH_PASSWD
#define	_PATH_PASSWD	"/etc/passwd"
#endif
#ifndef _PATH_GROUP
#define	_PATH_GROUP	"/etc/group"
#endif

/**********************************************************************/
/* Sizes for statically allocated buffers. */

/* If you change these values, also change _SC_GETPW_R_SIZE_MAX and
 * _SC_GETGR_R_SIZE_MAX in libc/unistd/sysconf.c to match */
#define PWD_BUFFER_SIZE 256
#define GRP_BUFFER_SIZE 256

/**********************************************************************/
/* Prototypes for internal functions. */

extern int __parsepwent(void *pw, char *line);
extern int __parsegrent(void *gr, char *line);
extern int __parsespent(void *sp, char *line);

extern int __pgsreader(int (*__parserfunc)(void *d, char *line), void *data,
					   char *__restrict line_buff, size_t buflen, FILE *f);


#ifndef GETXXKEY_R_FUNC
#error GETXXKEY_R_FUNC is not defined!
#endif
/**********************************************************************/
#ifdef GETXXKEY_R_FUNC

int GETXXKEY_R_FUNC(DO_GETXXKEY_R_KEYTYPE key,
					GETXXKEY_R_ENTTYPE *__restrict resultbuf,
					char *__restrict buffer, size_t buflen,
					GETXXKEY_R_ENTTYPE **__restrict result)
{
	FILE *stream;
	int rv;

	*result = NULL;

	if (!(stream = fopen(DO_GETXXKEY_R_PATHNAME, "r"))) {
		rv = errno;
	} else {
		do {
			if (!(rv = __pgsreader(GETXXKEY_R_PARSER, resultbuf,
								   buffer, buflen, stream))
				) {
				if (GETXXKEY_R_TEST(resultbuf)) { /* Found key? */
					*result = resultbuf;
					break;
				}
			} else {
				if (rv == ENOENT) {	/* end-of-file encountered. */
					rv = 0;
				}
				break;
			}
		} while (1);
		fclose(stream);
	}

	return rv;
}

#endif
/**********************************************************************/
#undef GETXXKEY_R_FUNC
#undef GETXXKEY_R_PARSER
#undef GETXXKEY_R_ENTTYPE
#undef GETXXKEY_R_TEST
#undef DO_GETXXKEY_R_KEYTYPE
#undef DO_GETXXKEY_R_PATHNAME