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perl-generated (.pod) manual pages too. This is another nail in the perl5 coffin (for base perl, not the port or the language in general).
244 lines
8.7 KiB
Groff
244 lines
8.7 KiB
Groff
.\" Automatically generated by Pod::Man version 1.15
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.\" Thu May 9 13:21:32 2002
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.\"
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.\" Standard preamble:
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.\" ======================================================================
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.de Sh \" Subsection heading
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.br
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.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and
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.rm #[ #] #H #V #F C
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.\" ======================================================================
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.\"
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.IX Title "SSL_READ 1"
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.TH SSL_READ 1 "perl v5.6.1" "2002-01-27" "User Contributed Perl Documentation"
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.UC
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.SH "NAME"
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SSL_read \- read bytes from a \s-1TLS/SSL\s0 connection.
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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_read(SSL *ssl, void *buf, int num);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_read()\fR tries to read \fBnum\fR bytes from the specified \fBssl\fR into the
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buffer \fBbuf\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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If necessary, \fISSL_read()\fR will negotiate a \s-1TLS/SSL\s0 session, if
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not already explicitly performed by SSL_connect(3) or
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SSL_accept(3). If the
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peer requests a re-negotiation, it will be performed transparently during
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the \fISSL_read()\fR operation. The behaviour of \fISSL_read()\fR depends on the
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underlying \s-1BIO\s0.
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.PP
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For the transparent negotiation to succeed, the \fBssl\fR must have been
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initialized to client or server mode. This is being done by calling
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SSL_set_connect_state(3) or \fISSL_set_accept_state()\fR
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before the first call to an \fISSL_read()\fR or SSL_write(3)
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function.
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.PP
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\&\fISSL_read()\fR works based on the \s-1SSL/TLS\s0 records. The data are received in
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records (with a maximum record size of 16kB for SSLv3/TLSv1). Only when a
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record has been completely received, it can be processed (decryption and
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check of integrity). Therefore data that was not retrieved at the last
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call of \fISSL_read()\fR can still be buffered inside the \s-1SSL\s0 layer and will be
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retrieved on the next call to \fISSL_read()\fR. If \fBnum\fR is higher than the
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number of bytes buffered, \fISSL_read()\fR will return with the bytes buffered.
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If no more bytes are in the buffer, \fISSL_read()\fR will trigger the processing
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of the next record. Only when the record has been received and processed
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completely, \fISSL_read()\fR will return reporting success. At most the contents
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of the record will be returned. As the size of an \s-1SSL/TLS\s0 record may exceed
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the maximum packet size of the underlying transport (e.g. \s-1TCP\s0), it may
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be necessary to read several packets from the transport layer before the
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record is complete and \fISSL_read()\fR can succeed.
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.PP
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If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_read()\fR will only return, once the
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read operation has been finished or an error occurred, except when a
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renegotiation take place, in which case a \s-1SSL_ERROR_WANT_READ\s0 may occur.
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This behaviour can be controlled with the \s-1SSL_MODE_AUTO_RETRY\s0 flag of the
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SSL_CTX_set_mode(3) call.
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.PP
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If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_read()\fR will also return
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when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_read()\fR
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to continue the operation. In this case a call to
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SSL_get_error(3) with the
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return value of \fISSL_read()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
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\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. As at any time a re-negotiation is possible, a
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call to \fISSL_read()\fR can also cause write operations! The calling process
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then must repeat the call after taking appropriate action to satisfy the
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needs of \fISSL_read()\fR. The action depends on the underlying \s-1BIO\s0. When using a
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non-blocking socket, nothing is to be done, but \fIselect()\fR can be used to check
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for the required condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data
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must be written into or retrieved out of the \s-1BIO\s0 before being able to continue.
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.SH "WARNING"
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.IX Header "WARNING"
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When an \fISSL_read()\fR operation has to be repeated because of
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\&\fB\s-1SSL_ERROR_WANT_READ\s0\fR or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR, it must be repeated
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with the same arguments.
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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" 4
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.IX Item ">0"
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The read operation was successful; the return value is the number of
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bytes actually read from the \s-1TLS/SSL\s0 connection.
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.Ip "0" 4
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The read operation was not successful. The reason may either be a clean
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shutdown due to a \*(L"close notify\*(R" alert sent by the peer (in which case
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the \s-1SSL_RECEIVED_SHUTDOWN\s0 flag in the ssl shutdown state is set
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(see SSL_shutdown(3),
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SSL_set_shutdown(3)). It is also possible, that
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the peer simply shut down the underlying transport and the shutdown is
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incomplete. Call \fISSL_get_error()\fR with the return value \fBret\fR to find out,
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whether an error occurred or the connection was shut down cleanly
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(\s-1SSL_ERROR_ZERO_RETURN\s0).
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.Sp
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SSLv2 (deprecated) does not support a shutdown alert protocol, so it can
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only be detected, whether the underlying connection was closed. It cannot
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be checked, whether the closure was initiated by the peer or by something
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else.
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.Ip "<0" 4
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.IX Item "<0"
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The read operation was not successful, because either an error occurred
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or action must be taken by the calling process. Call \fISSL_get_error()\fR with the
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return value \fBret\fR 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_get_error(3), SSL_write(3),
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SSL_CTX_set_mode(3), SSL_CTX_new(3),
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SSL_connect(3), SSL_accept(3)
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SSL_set_connect_state(3),
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SSL_shutdown(3), SSL_set_shutdown(3),
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ssl(3), bio(3)
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