mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-08 22:30:07 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
431 lines
12 KiB
C
431 lines
12 KiB
C
/* Copyright (C) 1996-2022 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.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <assert.h>
|
|
#include <atomic.h>
|
|
#include <errno.h>
|
|
#include <stdbool.h>
|
|
#include "nsswitch.h"
|
|
#include "sysdep.h"
|
|
#ifdef USE_NSCD
|
|
# include <nscd/nscd_proto.h>
|
|
#endif
|
|
#ifdef NEED__RES
|
|
# include <resolv/resolv_context.h>
|
|
#endif
|
|
/*******************************************************************\
|
|
|* Here we assume several symbols to be defined: *|
|
|
|* *|
|
|
|* LOOKUP_TYPE - the return type of the function *|
|
|
|* *|
|
|
|* FUNCTION_NAME - name of the non-reentrant function *|
|
|
|* *|
|
|
|* DATABASE_NAME - name of the database the function accesses *|
|
|
|* (e.g., host, services, ...) *|
|
|
|* *|
|
|
|* ADD_PARAMS - additional parameters, can vary in number *|
|
|
|* *|
|
|
|* ADD_VARIABLES - names of additional parameters *|
|
|
|* *|
|
|
|* Optionally the following vars can be defined: *|
|
|
|* *|
|
|
|* EXTRA_PARAMS - optional parameters, can vary in number *|
|
|
|* *|
|
|
|* EXTRA_VARIABLES - names of optional parameter *|
|
|
|* *|
|
|
|* FUNCTION2_NAME - alternative name of the non-reentrant function *|
|
|
|* *|
|
|
|* NEED_H_ERRNO - an extra parameter will be passed to point to *|
|
|
|* the global `h_errno' variable. *|
|
|
|* *|
|
|
|* NEED__RES - obtain a struct resolv_context resolver context *|
|
|
|* *|
|
|
|* PREPROCESS - code run before anything else *|
|
|
|* *|
|
|
|* POSTPROCESS - code run after the lookup *|
|
|
|* *|
|
|
\*******************************************************************/
|
|
|
|
/* To make the real sources a bit prettier. */
|
|
#define REENTRANT_NAME APPEND_R (FUNCTION_NAME)
|
|
#ifdef FUNCTION2_NAME
|
|
# define REENTRANT2_NAME APPEND_R (FUNCTION2_NAME)
|
|
#else
|
|
# define REENTRANT2_NAME NULL
|
|
#endif
|
|
#define APPEND_R(name) APPEND_R1 (name)
|
|
#define APPEND_R1(name) name##_r
|
|
#define INTERNAL(name) INTERNAL1 (name)
|
|
#define INTERNAL1(name) __##name
|
|
#define NEW(name) NEW1 (name)
|
|
#define NEW1(name) __new_##name
|
|
|
|
#ifdef USE_NSCD
|
|
# define NSCD_NAME ADD_NSCD (REENTRANT_NAME)
|
|
# define ADD_NSCD(name) ADD_NSCD1 (name)
|
|
# define ADD_NSCD1(name) __nscd_##name
|
|
# define NOT_USENSCD_NAME ADD_NOT_NSCDUSE (DATABASE_NAME)
|
|
# define ADD_NOT_NSCDUSE(name) ADD_NOT_NSCDUSE1 (name)
|
|
# define ADD_NOT_NSCDUSE1(name) __nss_not_use_nscd_##name
|
|
# define CONCAT2(arg1, arg2) CONCAT2_2 (arg1, arg2)
|
|
# define CONCAT2_2(arg1, arg2) arg1##arg2
|
|
#endif
|
|
|
|
#define FUNCTION_NAME_STRING STRINGIZE (FUNCTION_NAME)
|
|
#define REENTRANT_NAME_STRING STRINGIZE (REENTRANT_NAME)
|
|
#ifdef FUNCTION2_NAME
|
|
# define REENTRANT2_NAME_STRING STRINGIZE (REENTRANT2_NAME)
|
|
#else
|
|
# define REENTRANT2_NAME_STRING NULL
|
|
#endif
|
|
#define DATABASE_NAME_STRING STRINGIZE (DATABASE_NAME)
|
|
#define STRINGIZE(name) STRINGIZE1 (name)
|
|
#define STRINGIZE1(name) #name
|
|
|
|
#ifndef DB_LOOKUP_FCT
|
|
# define DB_LOOKUP_FCT CONCAT3_1 (__nss_, DATABASE_NAME, _lookup2)
|
|
# define CONCAT3_1(Pre, Name, Post) CONCAT3_2 (Pre, Name, Post)
|
|
# define CONCAT3_2(Pre, Name, Post) Pre##Name##Post
|
|
#endif
|
|
|
|
/* Sometimes we need to store error codes in the `h_errno' variable. */
|
|
#ifdef NEED_H_ERRNO
|
|
# define H_ERRNO_PARM , int *h_errnop
|
|
# define H_ERRNO_VAR , h_errnop
|
|
# define H_ERRNO_VAR_P h_errnop
|
|
#else
|
|
# define H_ERRNO_PARM
|
|
# define H_ERRNO_VAR
|
|
# define H_ERRNO_VAR_P NULL
|
|
#endif
|
|
|
|
#ifndef EXTRA_PARAMS
|
|
# define EXTRA_PARAMS
|
|
#endif
|
|
#ifndef EXTRA_VARIABLES
|
|
# define EXTRA_VARIABLES
|
|
#endif
|
|
|
|
#ifdef HAVE_AF
|
|
# define AF_VAL af
|
|
#else
|
|
# define AF_VAL AF_INET
|
|
#endif
|
|
|
|
|
|
/* Set defaults for merge functions that haven't been defined. */
|
|
#ifndef DEEPCOPY_FN
|
|
static inline int
|
|
__copy_einval (LOOKUP_TYPE a,
|
|
const size_t b,
|
|
LOOKUP_TYPE *c,
|
|
char *d,
|
|
char **e)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
# define DEEPCOPY_FN __copy_einval
|
|
#endif
|
|
|
|
#ifndef MERGE_FN
|
|
static inline int
|
|
__merge_einval (LOOKUP_TYPE *a,
|
|
char *b,
|
|
char *c,
|
|
size_t d,
|
|
LOOKUP_TYPE *e,
|
|
char *f)
|
|
{
|
|
return EINVAL;
|
|
}
|
|
# define MERGE_FN __merge_einval
|
|
#endif
|
|
|
|
#define CHECK_MERGE(err, status) \
|
|
({ \
|
|
do \
|
|
{ \
|
|
if (err) \
|
|
{ \
|
|
__set_errno (err); \
|
|
if (err == ERANGE) \
|
|
status = NSS_STATUS_TRYAGAIN; \
|
|
else \
|
|
status = NSS_STATUS_UNAVAIL; \
|
|
break; \
|
|
} \
|
|
} \
|
|
while (0); \
|
|
})
|
|
|
|
/* Type of the lookup function we need here. */
|
|
typedef enum nss_status (*lookup_function) (ADD_PARAMS, LOOKUP_TYPE *, char *,
|
|
size_t, int * H_ERRNO_PARM
|
|
EXTRA_PARAMS);
|
|
|
|
/* The lookup function for the first entry of this service. */
|
|
extern int DB_LOOKUP_FCT (nss_action_list *nip, const char *name,
|
|
const char *name2, void **fctp);
|
|
libc_hidden_proto (DB_LOOKUP_FCT)
|
|
|
|
|
|
int
|
|
INTERNAL (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer,
|
|
size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM
|
|
EXTRA_PARAMS)
|
|
{
|
|
nss_action_list nip;
|
|
int do_merge = 0;
|
|
LOOKUP_TYPE mergegrp;
|
|
char *mergebuf = NULL;
|
|
char *endptr = NULL;
|
|
union
|
|
{
|
|
lookup_function l;
|
|
void *ptr;
|
|
} fct;
|
|
int no_more, err;
|
|
enum nss_status status = NSS_STATUS_UNAVAIL;
|
|
#ifdef USE_NSCD
|
|
int nscd_status;
|
|
#endif
|
|
#ifdef NEED_H_ERRNO
|
|
bool any_service = false;
|
|
#endif
|
|
|
|
#ifdef NEED__RES
|
|
/* The HANDLE_DIGITS_DOTS case below already needs the resolver
|
|
configuration, so this has to happen early. */
|
|
struct resolv_context *res_ctx = __resolv_context_get ();
|
|
if (res_ctx == NULL)
|
|
{
|
|
*h_errnop = NETDB_INTERNAL;
|
|
*result = NULL;
|
|
return errno;
|
|
}
|
|
#endif /* NEED__RES */
|
|
|
|
#ifdef PREPROCESS
|
|
PREPROCESS;
|
|
#endif
|
|
|
|
|
|
#ifdef HANDLE_DIGITS_DOTS
|
|
switch (__nss_hostname_digits_dots (name, resbuf, &buffer, NULL,
|
|
buflen, result, &status, AF_VAL,
|
|
H_ERRNO_VAR_P))
|
|
{
|
|
case -1:
|
|
# ifdef NEED__RES
|
|
__resolv_context_put (res_ctx);
|
|
# endif
|
|
return errno;
|
|
case 1:
|
|
#ifdef NEED_H_ERRNO
|
|
any_service = true;
|
|
#endif
|
|
goto done;
|
|
}
|
|
#endif
|
|
|
|
#ifdef USE_NSCD
|
|
if (NOT_USENSCD_NAME > 0 && ++NOT_USENSCD_NAME > NSS_NSCD_RETRY)
|
|
NOT_USENSCD_NAME = 0;
|
|
|
|
if (!NOT_USENSCD_NAME
|
|
&& !__nss_database_custom[CONCAT2 (NSS_DBSIDX_, DATABASE_NAME)])
|
|
{
|
|
nscd_status = NSCD_NAME (ADD_VARIABLES, resbuf, buffer, buflen, result
|
|
H_ERRNO_VAR);
|
|
if (nscd_status >= 0)
|
|
{
|
|
# ifdef NEED__RES
|
|
__resolv_context_put (res_ctx);
|
|
# endif
|
|
return nscd_status;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
no_more = DB_LOOKUP_FCT (&nip, REENTRANT_NAME_STRING,
|
|
REENTRANT2_NAME_STRING, &fct.ptr);
|
|
|
|
while (no_more == 0)
|
|
{
|
|
#ifdef NEED_H_ERRNO
|
|
any_service = true;
|
|
#endif
|
|
|
|
status = DL_CALL_FCT (fct.l, (ADD_VARIABLES, resbuf, buffer, buflen,
|
|
&errno H_ERRNO_VAR EXTRA_VARIABLES));
|
|
|
|
/* The status is NSS_STATUS_TRYAGAIN and errno is ERANGE the
|
|
provided buffer is too small. In this case we should give
|
|
the user the possibility to enlarge the buffer and we should
|
|
not simply go on with the next service (even if the TRYAGAIN
|
|
action tells us so). */
|
|
if (status == NSS_STATUS_TRYAGAIN
|
|
#ifdef NEED_H_ERRNO
|
|
&& *h_errnop == NETDB_INTERNAL
|
|
#endif
|
|
&& errno == ERANGE)
|
|
break;
|
|
|
|
if (do_merge)
|
|
{
|
|
|
|
if (status == NSS_STATUS_SUCCESS)
|
|
{
|
|
/* The previous loop saved a buffer for merging.
|
|
Perform the merge now. */
|
|
err = MERGE_FN (&mergegrp, mergebuf, endptr, buflen, resbuf,
|
|
buffer);
|
|
CHECK_MERGE (err,status);
|
|
do_merge = 0;
|
|
}
|
|
else
|
|
{
|
|
/* If the result wasn't SUCCESS, copy the saved buffer back
|
|
into the result buffer and set the status back to
|
|
NSS_STATUS_SUCCESS to match the previous pass through the
|
|
loop.
|
|
* If the next action is CONTINUE, it will overwrite the value
|
|
currently in the buffer and return the new value.
|
|
* If the next action is RETURN, we'll return the previously-
|
|
acquired values.
|
|
* If the next action is MERGE, then it will be added to the
|
|
buffer saved from the previous source. */
|
|
err = DEEPCOPY_FN (mergegrp, buflen, resbuf, buffer, NULL);
|
|
CHECK_MERGE (err, status);
|
|
status = NSS_STATUS_SUCCESS;
|
|
}
|
|
}
|
|
|
|
/* If we were are configured to merge this value with the next one,
|
|
save the current value of the group struct. */
|
|
if (nss_next_action (nip, status) == NSS_ACTION_MERGE
|
|
&& status == NSS_STATUS_SUCCESS)
|
|
{
|
|
/* Copy the current values into a buffer to be merged with the next
|
|
set of retrieved values. */
|
|
if (mergebuf == NULL)
|
|
{
|
|
/* Only allocate once and reuse it for as many merges as we need
|
|
to perform. */
|
|
mergebuf = malloc (buflen);
|
|
if (mergebuf == NULL)
|
|
{
|
|
__set_errno (ENOMEM);
|
|
status = NSS_STATUS_UNAVAIL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
err = DEEPCOPY_FN (*resbuf, buflen, &mergegrp, mergebuf, &endptr);
|
|
CHECK_MERGE (err, status);
|
|
do_merge = 1;
|
|
}
|
|
|
|
no_more = __nss_next2 (&nip, REENTRANT_NAME_STRING,
|
|
REENTRANT2_NAME_STRING, &fct.ptr, status, 0);
|
|
}
|
|
free (mergebuf);
|
|
mergebuf = NULL;
|
|
|
|
#ifdef HANDLE_DIGITS_DOTS
|
|
done:
|
|
#endif
|
|
*result = status == NSS_STATUS_SUCCESS ? resbuf : NULL;
|
|
#ifdef NEED_H_ERRNO
|
|
if (status == NSS_STATUS_UNAVAIL && !any_service && errno != ENOENT)
|
|
/* This happens when we weren't able to use a service for reasons other
|
|
than the module not being found. In such a case, we'd want to tell the
|
|
caller that errno has the real reason for failure. */
|
|
*h_errnop = NETDB_INTERNAL;
|
|
else if (status != NSS_STATUS_SUCCESS && !any_service)
|
|
/* We were not able to use any service. */
|
|
*h_errnop = NO_RECOVERY;
|
|
#endif
|
|
#ifdef POSTPROCESS
|
|
POSTPROCESS;
|
|
#endif
|
|
|
|
#ifdef NEED__RES
|
|
/* This has to happen late because the POSTPROCESS stage above might
|
|
need the resolver context. */
|
|
__resolv_context_put (res_ctx);
|
|
#endif /* NEED__RES */
|
|
|
|
int res;
|
|
if (status == NSS_STATUS_SUCCESS || status == NSS_STATUS_NOTFOUND)
|
|
res = 0;
|
|
/* Don't pass back ERANGE if this is not for a too-small buffer. */
|
|
else if (errno == ERANGE && status != NSS_STATUS_TRYAGAIN)
|
|
res = EINVAL;
|
|
#ifdef NEED_H_ERRNO
|
|
/* These functions only set errno if h_errno is NETDB_INTERNAL. */
|
|
else if (status == NSS_STATUS_TRYAGAIN && *h_errnop != NETDB_INTERNAL)
|
|
res = EAGAIN;
|
|
#endif
|
|
else
|
|
return errno;
|
|
|
|
__set_errno (res);
|
|
return res;
|
|
}
|
|
|
|
|
|
#ifdef NO_COMPAT_NEEDED
|
|
strong_alias (INTERNAL (REENTRANT_NAME), REENTRANT_NAME);
|
|
#elif !defined FUNCTION2_NAME
|
|
# include <shlib-compat.h>
|
|
# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1_2)
|
|
# define OLD(name) OLD1 (name)
|
|
# define OLD1(name) __old_##name
|
|
|
|
int
|
|
attribute_compat_text_section
|
|
OLD (REENTRANT_NAME) (ADD_PARAMS, LOOKUP_TYPE *resbuf, char *buffer,
|
|
size_t buflen, LOOKUP_TYPE **result H_ERRNO_PARM)
|
|
{
|
|
int ret = INTERNAL (REENTRANT_NAME) (ADD_VARIABLES, resbuf, buffer,
|
|
buflen, result H_ERRNO_VAR);
|
|
|
|
if (ret != 0 || result == NULL)
|
|
ret = -1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
# define do_symbol_version(real, name, version) \
|
|
compat_symbol (libc, real, name, version)
|
|
do_symbol_version (OLD (REENTRANT_NAME), REENTRANT_NAME, GLIBC_2_0);
|
|
# endif
|
|
|
|
/* As INTERNAL (REENTRANT_NAME) may be hidden, we need an alias
|
|
in between so that the REENTRANT_NAME@@GLIBC_2.1.2 is not
|
|
hidden too. */
|
|
strong_alias (INTERNAL (REENTRANT_NAME), NEW (REENTRANT_NAME));
|
|
|
|
# define do_default_symbol_version(real, name, version) \
|
|
versioned_symbol (libc, real, name, version)
|
|
do_default_symbol_version (NEW (REENTRANT_NAME),
|
|
REENTRANT_NAME, GLIBC_2_1_2);
|
|
#endif
|
|
|
|
nss_interface_function (REENTRANT_NAME)
|