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/* Copyright (C) 2002, 2003 Thorsten Kukuk
Author: Thorsten Kukuk <kukuk@suse.de>
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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pwd.h>
#include <shadow.h>
#include <ctype.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <nss.h>
#include <bits/libc-lock.h>
#define __libc_lock_t pthread_mutex_t
#include "read-files.h"
static enum { none, getent, getby }last_use;
#define ISCOLON(c) ((c) == ':')
#define STRING_FIELD(variable, terminator_p, swallow) \
{ \
variable = line; \
while (*line != '\0' && !terminator_p (*line)) \
++line; \
if (*line != '\0') \
{ \
*line = '\0'; \
do \
++line; \
while (swallow && terminator_p (*line)); \
} \
}
#define INT_FIELD(variable, terminator_p, swallow, base, convert) \
{ \
char *endp; \
variable = convert (strtoul (line, &endp, base)); \
if (endp == line) \
return 0; \
else if (terminator_p (*endp)) \
do \
++endp; \
while (swallow && terminator_p (*endp)); \
else if (*endp != '\0') \
return 0; \
line = endp; \
}
#define INT_FIELD_MAYBE_NULL(variable, terminator_p, swallow, base, convert, default) \
{ \
char *endp; \
if (*line == '\0') \
/* We expect some more input, so don't allow the string to end here. */ \
return 0; \
variable = convert (strtoul (line, &endp, base)); \
if (endp == line) \
variable = default; \
if (terminator_p (*endp)) \
do \
++endp; \
while (swallow && terminator_p (*endp)); \
else if (*endp != '\0') \
return 0; \
line = endp; \
}
static inline int
parse_pwent (char *line, struct passwd *result)
{
char *p = strpbrk (line, "\n");
if (p != NULL)
*p = '\0';
STRING_FIELD (result->pw_name, ISCOLON, 0);
if (line[0] == '\0'
&& (result->pw_name[0] == '+' || result->pw_name[0] == '-'))
{
/* This a special case. We allow lines containing only a `+' sign
since this is used for nss_compat. All other services will
reject this entry later. Initialize all other fields now. */
result->pw_passwd = NULL;
result->pw_uid = 0;
result->pw_gid = 0;
result->pw_gecos = NULL;
result->pw_dir = NULL;
result->pw_shell = NULL;
}
else
{
STRING_FIELD (result->pw_passwd, ISCOLON, 0);
if (result->pw_name[0] == '+' || result->pw_name[0] == '-')
{
INT_FIELD_MAYBE_NULL (result->pw_uid, ISCOLON, 0, 10, , 0)
INT_FIELD_MAYBE_NULL (result->pw_gid, ISCOLON, 0, 10, , 0)
}
else
{
INT_FIELD (result->pw_uid, ISCOLON, 0, 10,)
INT_FIELD (result->pw_gid, ISCOLON, 0, 10,)
}
STRING_FIELD (result->pw_gecos, ISCOLON, 0);
STRING_FIELD (result->pw_dir, ISCOLON, 0);
result->pw_shell = line;
}
return 1;
}
/* Predicate which always returns false, needed below. */
#undef FALSE
#define FALSE(arg) 0
static inline int
parse_spent (char *line, struct spwd *result)
{
char *p = strpbrk (line, "\n");
if (p != NULL)
*p = '\0';
result->sp_namp = line;
while (*line != '\0' && !ISCOLON (*line))
++line;
if (*line != '\0')
{
*line = '\0';
++line;
}
if (line[0] == '\0'
&& (result->sp_namp[0] == '+' || result->sp_namp[0] == '-'))
{
result->sp_pwdp = NULL;
result->sp_lstchg = 0;
result->sp_min = 0;
result->sp_max = 0;
result->sp_warn = -1l;
result->sp_inact = -1l;
result->sp_expire = -1l;
result->sp_flag = ~0ul;
}
else
{
result->sp_pwdp = line;
while (*line != '\0' && !ISCOLON (*line))
++line;
if (*line != '\0')
{
*line = '\0';
++line;
}
INT_FIELD_MAYBE_NULL (result->sp_lstchg, ISCOLON, 0, 10, (long int),
(long int) -1);
INT_FIELD_MAYBE_NULL (result->sp_min, ISCOLON, 0, 10, (long int),
(long int) -1);
INT_FIELD_MAYBE_NULL (result->sp_max, ISCOLON, 0, 10, (long int),
(long int) -1);
while (isspace (*line))
++line;
if (*line == '\0')
{
/* The old form. */
result->sp_warn = -1l;
result->sp_inact = -1l;
result->sp_expire = -1l;
result->sp_flag = ~0ul;
}
else
{
INT_FIELD_MAYBE_NULL (result->sp_warn, ISCOLON, 0, 10, (long int),
(long int) -1);
INT_FIELD_MAYBE_NULL (result->sp_inact, ISCOLON, 0, 10, (long int),
(long int) -1);
INT_FIELD_MAYBE_NULL (result->sp_expire, ISCOLON, 0, 10, (long int),
(long int) -1);
if (*line != '\0')
INT_FIELD_MAYBE_NULL (result->sp_flag, FALSE, 0, 10,
(unsigned long int), ~0ul)
else
result->sp_flag = ~0ul;
}
}
return 1;
}
static enum nss_status
internal_setent (FILE **stream, const char *file)
{
enum nss_status status = NSS_STATUS_SUCCESS;
if (*stream == NULL)
{
char *filename = alloca (strlen (files_etc_dir) + 8);
strcpy (filename, files_etc_dir);
strcat (filename, file);
*stream = fopen (filename, "r");
if (*stream == NULL)
status = errno == EAGAIN ? NSS_STATUS_TRYAGAIN : NSS_STATUS_UNAVAIL;
else
{
int result, flags;
result = flags = fcntl (fileno (*stream), F_GETFD, 0);
if (result >= 0)
{
flags |= 1;
result = fcntl (fileno (*stream), F_SETFD, flags);
}
if (result < 0)
{
fclose (*stream);
stream = NULL;
status = NSS_STATUS_UNAVAIL;
}
}
}
else
rewind (*stream);
return status;
}
static void
internal_endent (FILE **stream)
{
if (*stream != NULL)
{
fclose (*stream);
stream = NULL;
}
}
static enum nss_status
internal_getspent (FILE *stream, struct spwd *result,
char *buffer, size_t buflen, int *errnop)
{
char *p;
char *data = (void *) buffer;
int linebuflen = buffer + buflen - data;
int parse_result;
if (buflen < sizeof *data + 2)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
do {
((unsigned char *) data)[linebuflen - 1] = '\xff';
p = fgets (data, linebuflen, stream);
if (p == NULL)
{
*errnop = ENOENT;
return NSS_STATUS_NOTFOUND;
}
else if (((unsigned char *) data)[linebuflen - 1] != 0xff)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
/* Skip leading blanks. */
while (isspace (*p))
++p;
}
while (*p == '\0' || *p == '#'
|| !(parse_result = parse_spent (p, result)));
return parse_result == -1 ? NSS_STATUS_TRYAGAIN : NSS_STATUS_SUCCESS;
}
static enum nss_status
internal_getpwent (FILE *stream, struct passwd *result,
char *buffer, size_t buflen, int *errnop)
{
char *p;
char *data = (void *) buffer;
int linebuflen = buffer + buflen - data;
int parse_result;
if (buflen < sizeof *data + 2)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
do {
((unsigned char *) data)[linebuflen - 1] = '\xff';
p = fgets (data, linebuflen, stream);
if (p == NULL)
{
*errnop = ENOENT;
return NSS_STATUS_NOTFOUND;
}
else if (((unsigned char *) data)[linebuflen - 1] != 0xff)
{
*errnop = ERANGE;
return NSS_STATUS_TRYAGAIN;
}
/* Skip leading blanks. */
while (isspace (*p))
++p;
}
while (*p == '\0' || *p == '#'
|| !(parse_result = parse_pwent (p, result)));
return parse_result == -1 ? NSS_STATUS_TRYAGAIN : NSS_STATUS_SUCCESS;
}
enum nss_status
files_getspnam_r (const char *name, struct spwd *result,
char *buffer, size_t buflen, int *errnop)
{
/* Locks the static variables in this file. */
__libc_lock_define_initialized (static, lock)
enum nss_status status;
FILE *stream = NULL;
__libc_lock_lock (lock);
status = internal_setent (&stream, "/shadow");
if (status == NSS_STATUS_SUCCESS)
{
last_use = getby;
while ((status = internal_getspent (stream, result, buffer, buflen,
errnop)) == NSS_STATUS_SUCCESS)
{
if (name[0] != '+' && name[0] != '-'
&& ! strcmp (name, result->sp_namp))
break;
}
internal_endent (&stream);
}
__libc_lock_unlock (lock);
return status;
}
enum nss_status
files_getpwnam_r (const char *name, struct passwd *result,
char *buffer, size_t buflen, int *errnop)
{
/* Locks the static variables in this file. */
__libc_lock_define_initialized (static, lock)
enum nss_status status;
FILE *stream = NULL;
__libc_lock_lock (lock);
status = internal_setent (&stream, "/passwd");
if (status == NSS_STATUS_SUCCESS)
{
last_use = getby;
while ((status = internal_getpwent (stream, result, buffer, buflen,
errnop)) == NSS_STATUS_SUCCESS)
{
if (name[0] != '+' && name[0] != '-'
&& ! strcmp (name, result->pw_name))
break;
}
internal_endent (&stream);
}
__libc_lock_unlock (lock);
return status;
}
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