202 lines
6.4 KiB
Groff
202 lines
6.4 KiB
Groff
.\" $NetBSD: SSL_COMP_add_compression_method.3,v 1.7 2004/03/20 21:48:46 groo Exp $
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.\" ======================================================================
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.\"
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.IX Title "SSL_COMP_add_compression_method 3"
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.TH SSL_COMP_add_compression_method 3 "0.9.7d" "2004-03-19" "OpenSSL"
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.UC
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.SH "NAME"
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SSL_COMP_add_compression_method \- handle \s-1SSL/TLS\s0 integrated compression methods
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.SH "LIBRARY"
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libcrypto, -lcrypto
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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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.Ve
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.Vb 1
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\& int SSL_COMP_add_compression_method(int id, COMP_METHOD *cm);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_COMP_add_compression_method()\fR adds the compression method \fBcm\fR with
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the identifier \fBid\fR to the list of available compression methods. This
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list is globally maintained for all \s-1SSL\s0 operations within this application.
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It cannot be set for specific \s-1SSL_CTX\s0 or \s-1SSL\s0 objects.
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.SH "NOTES"
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.IX Header "NOTES"
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The \s-1TLS\s0 standard (or SSLv3) allows the integration of compression methods
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into the communication. The \s-1TLS\s0 \s-1RFC\s0 does however not specify compression
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methods or their corresponding identifiers, so there is currently no compatible
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way to integrate compression with unknown peers. It is therefore currently not
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recommended to integrate compression into applications. Applications for
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non-public use may agree on certain compression methods. Using different
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compression methods with the same identifier will lead to connection failure.
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.PP
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An OpenSSL client speaking a protocol that allows compression (SSLv3, TLSv1)
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will unconditionally send the list of all compression methods enabled with
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\&\fISSL_COMP_add_compression_method()\fR to the server during the handshake.
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Unlike the mechanisms to set a cipher list, there is no method available to
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restrict the list of compression method on a per connection basis.
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.PP
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An OpenSSL server will match the identifiers listed by a client against
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its own compression methods and will unconditionally activate compression
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when a matching identifier is found. There is no way to restrict the list
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of compression methods supported on a per connection basis.
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.PP
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The OpenSSL library has the compression methods \fB\f(BICOMP_rle()\fB\fR and (when
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especially enabled during compilation) \fB\f(BICOMP_zlib()\fB\fR available.
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.SH "WARNINGS"
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.IX Header "WARNINGS"
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Once the identities of the compression methods for the \s-1TLS\s0 protocol have
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been standardized, the compression \s-1API\s0 will most likely be changed. Using
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it in the current state is not recommended.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISSL_COMP_add_compression_method()\fR may return the following values:
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.Ip "0" 4
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The operation succeeded.
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.Ip "1" 4
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.IX Item "1"
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The operation failed. Check the error queue to find out the reason.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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ssl(3)
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