glibc/nis/nis_subr.c

352 lines
7.2 KiB
C

/* Copyright (c) 1997-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
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.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <string.h>
#include <rpcsvc/nis.h>
nis_name
nis_leaf_of (const_nis_name name)
{
static char result[NIS_MAXNAMELEN + 1];
return nis_leaf_of_r (name, result, NIS_MAXNAMELEN);
}
nis_name
nis_leaf_of_r (const_nis_name name, char *buffer, size_t buflen)
{
size_t i = 0;
buffer[0] = '\0';
while (name[i] != '.' && name[i] != '\0')
i++;
if (__glibc_unlikely (i >= buflen))
{
__set_errno (ERANGE);
return NULL;
}
*((char *) __mempcpy (buffer, name, i)) = '\0';
return buffer;
}
libnsl_hidden_def (nis_leaf_of_r)
nis_name
nis_name_of (const_nis_name name)
{
static char result[NIS_MAXNAMELEN + 1];
return nis_name_of_r (name, result, NIS_MAXNAMELEN);
}
nis_name
nis_name_of_r (const_nis_name name, char *buffer, size_t buflen)
{
char *local_domain;
int diff;
local_domain = nis_local_directory ();
diff = strlen (name) - strlen (local_domain);
if (diff <= 0)
return NULL;
if (strcmp (&name[diff], local_domain) != 0)
return NULL;
if ((size_t) diff >= buflen)
{
__set_errno (ERANGE);
return NULL;
}
*((char *) __mempcpy (buffer, name, diff - 1)) = '\0';
if (diff - 1 == 0)
return NULL;
return buffer;
}
libnsl_hidden_def (nis_name_of_r)
static int __always_inline
count_dots (const_nis_name str)
{
int count = 0;
for (size_t i = 0; str[i] != '\0'; ++i)
if (str[i] == '.')
++count;
return count;
}
/* If we run out of memory, we don't give already allocated memory
free. The overhead for bringing getnames back in a safe state to
free it is to big. */
nis_name *
nis_getnames (const_nis_name name)
{
const char *local_domain = nis_local_directory ();
size_t local_domain_len = strlen (local_domain);
size_t name_len = strlen (name);
char *path;
int pos = 0;
char *saveptr = NULL;
int have_point;
const char *cp;
const char *cp2;
int count = 2;
nis_name *getnames = malloc ((count + 1) * sizeof (char *));
if (__glibc_unlikely (getnames == NULL))
return NULL;
/* Do we have a fully qualified NIS+ name ? If yes, give it back */
if (name[name_len - 1] == '.')
{
if ((getnames[0] = strdup (name)) == NULL)
{
free_null:
while (pos-- > 0)
free (getnames[pos]);
free (getnames);
return NULL;
}
getnames[1] = NULL;
return getnames;
}
/* If the passed NAME is shared a suffix (the latter of course with
a final dot) with each other we pass back NAME with a final
dot. */
if (local_domain_len > 2)
{
have_point = 0;
cp = &local_domain[local_domain_len - 2];
cp2 = &name[name_len - 1];
while (*cp == *cp2)
{
if (*cp == '.')
have_point = 1;
--cp;
--cp2;
if (cp < local_domain)
{
have_point = cp2 < name || *cp2 == '.';
break;
}
if (cp2 < name)
{
have_point = *cp == '.';
break;
}
}
if (have_point)
{
getnames[0] = malloc (name_len + 2);
if (getnames[0] == NULL)
goto free_null;
strcpy (stpcpy (getnames[0], name), ".");
++pos;
}
}
/* Get the search path, where we have to search "name" */
path = getenv ("NIS_PATH");
if (path == NULL)
path = strdupa ("$");
else
path = strdupa (path);
have_point = strchr (name, '.') != NULL;
cp = __strtok_r (path, ":", &saveptr);
while (cp)
{
if (strcmp (cp, "$") == 0)
{
const char *cptr = local_domain;
char *tmp;
while (*cptr != '\0' && count_dots (cptr) >= 2)
{
if (pos >= count)
{
count += 5;
nis_name *newp = realloc (getnames,
(count + 1) * sizeof (char *));
if (__glibc_unlikely (newp == NULL))
goto free_null;
getnames = newp;
}
tmp = malloc (strlen (cptr) + local_domain_len + name_len + 2);
if (__glibc_unlikely (tmp == NULL))
goto free_null;
getnames[pos] = tmp;
tmp = stpcpy (tmp, name);
*tmp++ = '.';
if (cptr[1] != '\0')
stpcpy (tmp, cptr);
else
++cptr;
++pos;
while (*cptr != '.' && *cptr != '\0')
++cptr;
if (cptr[0] != '\0' && cptr[1] != '\0')
/* If we have only ".", don't remove the "." */
++cptr;
}
}
else
{
char *tmp;
size_t cplen = strlen (cp);
if (cp[cplen - 1] == '$')
{
char *p;
tmp = malloc (cplen + local_domain_len + name_len + 2);
if (__glibc_unlikely (tmp == NULL))
goto free_null;
p = __stpcpy (tmp, name);
*p++ = '.';
p = __mempcpy (p, cp, cplen);
--p;
if (p[-1] != '.')
*p++ = '.';
__stpcpy (p, local_domain);
}
else
{
char *p;
tmp = malloc (cplen + name_len + 3);
if (__glibc_unlikely (tmp == NULL))
goto free_null;
p = __mempcpy (tmp, name, name_len);
*p++ = '.';
p = __mempcpy (p, cp, cplen);
if (p[-1] != '.')
*p++ = '.';
*p = '\0';
}
if (pos >= count)
{
count += 5;
nis_name *newp = realloc (getnames,
(count + 1) * sizeof (char *));
if (__glibc_unlikely (newp == NULL))
goto free_null;
getnames = newp;
}
getnames[pos] = tmp;
++pos;
}
cp = __strtok_r (NULL, ":", &saveptr);
}
if (pos == 0
&& __asprintf (&getnames[pos++], "%s%s%s%s",
name, name[name_len - 1] == '.' ? "" : ".",
local_domain,
local_domain[local_domain_len - 1] == '.' ? "" : ".") < 0)
goto free_null;
getnames[pos] = NULL;
return getnames;
}
libnsl_hidden_def (nis_getnames)
void
nis_freenames (nis_name *names)
{
int i = 0;
while (names[i] != NULL)
{
free (names[i]);
++i;
}
free (names);
}
libnsl_hidden_def (nis_freenames)
name_pos
nis_dir_cmp (const_nis_name n1, const_nis_name n2)
{
int len1, len2;
len1 = strlen (n1);
len2 = strlen (n2);
if (len1 == len2)
{
if (strcmp (n1, n2) == 0)
return SAME_NAME;
else
return NOT_SEQUENTIAL;
}
if (len1 < len2)
{
if (n2[len2 - len1 - 1] != '.')
return NOT_SEQUENTIAL;
else if (strcmp (&n2[len2 - len1], n1) == 0)
return HIGHER_NAME;
else
return NOT_SEQUENTIAL;
}
else
{
if (n1[len1 - len2 - 1] != '.')
return NOT_SEQUENTIAL;
else if (strcmp (&n1[len1 - len2], n2) == 0)
return LOWER_NAME;
else
return NOT_SEQUENTIAL;
}
}
libnsl_hidden_def (nis_dir_cmp)
void
nis_destroy_object (nis_object *obj)
{
nis_free_object (obj);
}
libnsl_hidden_def (nis_destroy_object)