mirror of
https://github.com/opnsense/src.git
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b077aed33b
Migrate to OpenSSL 3.0 in advance of FreeBSD 14.0. OpenSSL 1.1.1 (the version we were previously using) will be EOL as of 2023-09-11. Most of the base system has already been updated for a seamless switch to OpenSSL 3.0. For many components we've added `-DOPENSSL_API_COMPAT=0x10100000L` to CFLAGS to specify the API version, which avoids deprecation warnings from OpenSSL 3.0. Changes have also been made to avoid OpenSSL APIs that were already deprecated in OpenSSL 1.1.1. The process of updating to contemporary APIs can continue after this merge. Additional changes are still required for libarchive and Kerberos- related libraries or tools; workarounds will immediately follow this commit. Fixes are in progress in the upstream projects and will be incorporated when those are next updated. There are some performance regressions in benchmarks (certain tests in `openssl speed`) and in some OpenSSL consumers in ports (e.g. haproxy). Investigation will continue for these. Netflix's testing showed no functional regression and a rather small, albeit statistically significant, increase in CPU consumption with OpenSSL 3.0. Thanks to ngie@ and des@ for updating base system components, to antoine@ and bofh@ for ports exp-runs and port fixes/workarounds, and to Netflix and everyone who tested prior to commit or contributed to this update in other ways. PR: 271615 PR: 271656 [exp-run] Relnotes: Yes Sponsored by: The FreeBSD Foundation
194 lines
6.1 KiB
Groff
194 lines
6.1 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SSL_ALLOC_BUFFERS 3"
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.TH SSL_ALLOC_BUFFERS 3 "2023-05-30" "3.0.9" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_free_buffers, SSL_alloc_buffers \- manage SSL structure buffers
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& int SSL_free_buffers(SSL *ssl);
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\& int SSL_alloc_buffers(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fBSSL_free_buffers()\fR frees the read and write buffers of the given \fBssl\fR.
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\&\fBSSL_alloc_buffers()\fR allocates the read and write buffers of the given \fBssl\fR.
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.PP
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The \fB\s-1SSL_MODE_RELEASE_BUFFERS\s0\fR mode releases read or write buffers whenever
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the buffers have been drained. These functions allow applications to manually
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control when buffers are freed and allocated.
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.PP
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After freeing the buffers, the buffers are automatically reallocated upon a
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new read or write. The \fBSSL_alloc_buffers()\fR does not need to be called, but
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can be used to make sure the buffers are preallocated. This can be used to
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avoid allocation during data processing or with \fBCRYPTO_set_mem_functions()\fR
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to control where and how buffers are allocated.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can occur:
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.IP "0 (Failure)" 4
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.IX Item "0 (Failure)"
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The \fBSSL_free_buffers()\fR function returns 0 when there is pending data to be
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read or written. The \fBSSL_alloc_buffers()\fR function returns 0 when there is
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an allocation failure.
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.IP "1 (Success)" 4
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.IX Item "1 (Success)"
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The \fBSSL_free_buffers()\fR function returns 1 if the buffers have been freed. This
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value is also returned if the buffers had been freed before calling
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\&\fBSSL_free_buffers()\fR.
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The \fBSSL_alloc_buffers()\fR function returns 1 if the buffers have been allocated.
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This value is also returned if the buffers had been allocated before calling
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\&\fBSSL_alloc_buffers()\fR.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBssl\fR\|(7),
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\&\fBSSL_free\fR\|(3), \fBSSL_clear\fR\|(3),
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\&\fBSSL_new\fR\|(3), \fBSSL_CTX_set_mode\fR\|(3),
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\&\fBCRYPTO_set_mem_functions\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017\-2020 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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