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c-ares/docs/ares_library_cleanup.3

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Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.\"
.\" Copyright 1998 by the Massachusetts Institute of Technology.
.\" Copyright (C) 2004-2009 by Daniel Stenberg
provide SPDX identifiers and a REUSE CI job to verify All files have their licence and copyright information clearly identifiable. If not in the file header, they are set separately in .reuse/dep5. All used license texts are provided in LICENSES/
1 year ago
.\" SPDX-License-Identifier: MIT
.\"
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.TH ARES_LIBRARY_CLEANUP 3 "19 May 2009"
.SH NAME
ares_library_cleanup \- c-ares library deinitialization
.SH SYNOPSIS
.nf
#include <ares.h>
void ares_library_cleanup(void)
.fi
.SH DESCRIPTION
.PP
The
.B ares_library_cleanup
function uninitializes the c-ares library, freeing all resources
previously acquired by \fIares_library_init(3)\fP when the library
was initialized, provided there was only one single previous call to
\fIares_library_init(3)\fP. If there was more than one previous call to
\fIares_library_init(3)\fP, this function uninitializes the c-ares
library only if it is the call matching the call to
\fIares_library_init(3)\fP which initialized the library
(usually the very first call to \fIares_library_init(3)\fP).
Other calls to \fIares_library_cleanup(3)\fP have no effect other than
decrementing an internal counter.
.PP
This function must be called when the program using c-ares will
no longer need any c-ares function. Once the program has called
\fIares_library_cleanup(3)\fP sufficiently often such that the
library is uninitialised, it shall not make any further call to any
c-ares function.
.PP
This function does not cancel any pending c-ares lookups or requests
previously done. Program must use \fIares_cancel(3)\fP for this purpose.
.PP
.B This function is not thread safe.
You have to call it once the program is about to terminate, but this call must
be done once the program has terminated every single thread that it could have
initiated. This is required to avoid potential race conditions in library
deinitialization, and also due to the fact that \fIares_library_cleanup(3)\fP
might call functions from other libraries that are thread unsafe, and could
conflict with any other thread that is already using these other libraries.
.PP
Win32/64 application DLLs shall not call \fIares_library_cleanup(3)\fP from
the DllMain function. Doing so will produce deadlocks and other problems.
.SH AVAILABILITY
This function was first introduced in c-ares version 1.7.0 along with the
definition of preprocessor symbol \fICARES_HAVE_ARES_LIBRARY_CLEANUP\fP as an
indication of the availability of this function. Reference counting in
docs: provide better man page references When referring to another c-ares function use \fI function(3) \fP to let the webpage rendering find and cross-link them appropriately. SEE ALSO references should be ".BR name (3),", with a space before the open parenthesis. This helps the manpage to HTML renderer. Closes #565
1 year ago
\fIares_library_init(3)\fP and \fIares_library_cleanup(3)\fP, which requires
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
calls to the former function to match calls to the latter, is present since
docs: provide better man page references When referring to another c-ares function use \fI function(3) \fP to let the webpage rendering find and cross-link them appropriately. SEE ALSO references should be ".BR name (3),", with a space before the open parenthesis. This helps the manpage to HTML renderer. Closes #565
1 year ago
c-ares version 1.10.0. Earlier versions would deinitialize the library on the
first call to \fIares_library_cleanup(3)\fP.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
.PP
Since the introduction of this function, it is absolutely mandatory to call it
for any Win32/64 program using c-ares.
.PP
Non-Win32/64 systems can still use c-ares version 1.7.0 without calling
\fIares_library_cleanup(3)\fP due to the fact that \fIcurrently\fP it is nearly
a do-nothing function on non-Win32/64 platforms.
.SH SEE ALSO
docs: provide better man page references When referring to another c-ares function use \fI function(3) \fP to let the webpage rendering find and cross-link them appropriately. SEE ALSO references should be ".BR name (3),", with a space before the open parenthesis. This helps the manpage to HTML renderer. Closes #565
1 year ago
.BR ares_library_init (3),
.BR ares_cancel (3)