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Edit File : SSL_write.3ssl \| Size : 8.19 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \(-- will .\" give an unbreakable dash, \(PI will give pi, \(L" will give a left .\" double quote, and \(R" will give a right double quote. \(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \(C` and \(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(W\h'-12u'\(W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(W\h'-12u'\(W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \\|\(em\\| . ds PI \(p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" SSL_write \- write bytes to a TLS/SSL connection. .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ssl.h> \& \& int SSL_write(SSL ssl, const void *buf, int num); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBSSL_write()\fR writes \fBnum\fR bytes from the buffer \fBbuf\fR into the specified \&\fBssl\fR connection. .SH "NOTES" .IX Header "NOTES" If necessary, \fBSSL_write()\fR will negotiate a \s-1TLS/SSL\s0 session, if not already explicitly performed by \fBSSL_connect\fR\\|(3) or \&\fBSSL_accept\fR\\|(3). If the peer requests a re-negotiation, it will be performed transparently during the \fBSSL_write()\fR operation. The behaviour of \fBSSL_write()\fR depends on the underlying \s-1BIO.\s0 .PP For the transparent negotiation to succeed, the \fBssl\fR must have been initialized to client or server mode. This is being done by calling \&\fBSSL_set_connect_state\fR\\|(3) or \fBSSL_set_accept_state()\fR before the first call to an \fBSSL_read\fR\\|(3) or \fBSSL_write()\fR function. .PP If the underlying \s-1BIO\s0 is \fBblocking\fR, \fBSSL_write()\fR will only return, once the write operation has been finished or an error occurred, except when a renegotiation take place, in which case a \s-1SSL_ERROR_WANT_READ\s0 may occur. This behaviour can be controlled with the \s-1SSL_MODE_AUTO_RETRY\s0 flag of the \&\fBSSL_CTX_set_mode\fR\\|(3) call. .PP If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fBSSL_write()\fR will also return, when the underlying \s-1BIO\s0 could not satisfy the needs of \fBSSL_write()\fR to continue the operation. In this case a call to \&\fBSSL_get_error\fR\\|(3) with the return value of \fBSSL_write()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or \&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. As at any time a re-negotiation is possible, a call to \fBSSL_write()\fR can also cause read operations! The calling process then must repeat the call after taking appropriate action to satisfy the needs of \fBSSL_write()\fR. The action depends on the underlying \s-1BIO.\s0 When using a non-blocking socket, nothing is to be done, but \fBselect()\fR can be used to check for the required condition. When using a buffering \s-1BIO,\s0 like a \s-1BIO\s0 pair, data must be written into or retrieved out of the \s-1BIO\s0 before being able to continue. .PP \&\fBSSL_write()\fR will only return with success, when the complete contents of \fBbuf\fR of length \fBnum\fR has been written. This default behaviour can be changed with the \s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 option of \&\fBSSL_CTX_set_mode\fR\\|(3). When this flag is set, \&\fBSSL_write()\fR will also return with success, when a partial write has been successfully completed. In this case the \fBSSL_write()\fR operation is considered completed. The bytes are sent and a new \fBSSL_write()\fR operation with a new buffer (with the already sent bytes removed) must be started. A partial write is performed with the size of a message block, which is 16kB for SSLv3/TLSv1. .SH "WARNING" .IX Header "WARNING" When an \fBSSL_write()\fR operation has to be repeated because of \&\fB\s-1SSL_ERROR_WANT_READ\s0\fR or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR, it must be repeated with the same arguments. .PP When calling \fBSSL_write()\fR with num=0 bytes to be sent the behaviour is undefined. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The following return values can occur: .IP "> 0" 4 .IX Item "> 0" The write operation was successful, the return value is the number of bytes actually written to the \s-1TLS/SSL\s0 connection. .IP "<= 0" 4 .IX Item "<= 0" The write operation was not successful, because either the connection was closed, an error occurred or action must be taken by the calling process. Call \fBSSL_get_error()\fR with the return value \fBret\fR to find out the reason. .Sp SSLv2 (deprecated) does not support a shutdown alert protocol, so it can only be detected, whether the underlying connection was closed. It cannot be checked, why the closure happened. .Sp Old documentation indicated a difference between 0 and \-1, and that \-1 was retryable. You should instead call \fBSSL_get_error()\fR to find out if it's retryable. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBSSL_get_error\fR\\|(3), \fBSSL_read\fR\\|(3), \&\fBSSL_CTX_set_mode\fR\\|(3), \fBSSL_CTX_new\fR\\|(3), \&\fBSSL_connect\fR\\|(3), \fBSSL_accept\fR\\|(3) \&\fBSSL_set_connect_state\fR\\|(3), \&\fBssl\fR\\|(3), \fBbio\fR\\|(3) Back

Edit File : SSL_write.3ssl | Size : 8.19 KB

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.\" ========================================================================
.\"
.IX Title "SSL_write 3"
.TH SSL_write 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
SSL_write \- write bytes to a TLS/SSL connection.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& int SSL_write(SSL *ssl, const void *buf, int num);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBSSL_write()\fR writes \fBnum\fR bytes from the buffer \fBbuf\fR into the specified
\&\fBssl\fR connection.
.SH "NOTES"
.IX Header "NOTES"
If necessary, \fBSSL_write()\fR will negotiate a \s-1TLS/SSL\s0 session, if
not already explicitly performed by \fBSSL_connect\fR\|(3) or
\&\fBSSL_accept\fR\|(3). If the
peer requests a re-negotiation, it will be performed transparently during
the \fBSSL_write()\fR operation. The behaviour of \fBSSL_write()\fR depends on the
underlying \s-1BIO.\s0
.PP
For the transparent negotiation to succeed, the \fBssl\fR must have been
initialized to client or server mode. This is being done by calling
\&\fBSSL_set_connect_state\fR\|(3) or \fBSSL_set_accept_state()\fR
before the first call to an \fBSSL_read\fR\|(3) or \fBSSL_write()\fR function.
.PP
If the underlying \s-1BIO\s0 is \fBblocking\fR, \fBSSL_write()\fR will only return, once the
write operation has been finished or an error occurred, except when a
renegotiation take place, in which case a \s-1SSL_ERROR_WANT_READ\s0 may occur. 
This behaviour can be controlled with the \s-1SSL_MODE_AUTO_RETRY\s0 flag of the
\&\fBSSL_CTX_set_mode\fR\|(3) call.
.PP
If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fBSSL_write()\fR will also return,
when the underlying \s-1BIO\s0 could not satisfy the needs of \fBSSL_write()\fR
to continue the operation. In this case a call to
\&\fBSSL_get_error\fR\|(3) with the
return value of \fBSSL_write()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. As at any time a re-negotiation is possible, a
call to \fBSSL_write()\fR can also cause read operations! The calling process
then must repeat the call after taking appropriate action to satisfy the
needs of \fBSSL_write()\fR. The action depends on the underlying \s-1BIO.\s0 When using a
non-blocking socket, nothing is to be done, but \fBselect()\fR can be used to check
for the required condition. When using a buffering \s-1BIO,\s0 like a \s-1BIO\s0 pair, data
must be written into or retrieved out of the \s-1BIO\s0 before being able to continue.
.PP
\&\fBSSL_write()\fR will only return with success, when the complete contents
of \fBbuf\fR of length \fBnum\fR has been written. This default behaviour
can be changed with the \s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 option of
\&\fBSSL_CTX_set_mode\fR\|(3). When this flag is set,
\&\fBSSL_write()\fR will also return with success, when a partial write has been
successfully completed. In this case the \fBSSL_write()\fR operation is considered
completed. The bytes are sent and a new \fBSSL_write()\fR operation with a new
buffer (with the already sent bytes removed) must be started.
A partial write is performed with the size of a message block, which is
16kB for SSLv3/TLSv1.
.SH "WARNING"
.IX Header "WARNING"
When an \fBSSL_write()\fR operation has to be repeated because of
\&\fB\s-1SSL_ERROR_WANT_READ\s0\fR or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR, it must be repeated
with the same arguments.
.PP
When calling \fBSSL_write()\fR with num=0 bytes to be sent the behaviour is
undefined.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "> 0" 4
.IX Item "> 0"
The write operation was successful, the return value is the number of
bytes actually written to the \s-1TLS/SSL\s0 connection.
.IP "<= 0" 4
.IX Item "<= 0"
The write operation was not successful, because either the connection was
closed, an error occurred or action must be taken by the calling process.
Call \fBSSL_get_error()\fR with the return value \fBret\fR to find out the reason.
.Sp
SSLv2 (deprecated) does not support a shutdown alert protocol, so it can
only be detected, whether the underlying connection was closed. It cannot
be checked, why the closure happened.
.Sp
Old documentation indicated a difference between 0 and \-1, and that \-1 was
retryable.
You should instead call \fBSSL_get_error()\fR to find out if it's retryable.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBSSL_get_error\fR\|(3), \fBSSL_read\fR\|(3),
\&\fBSSL_CTX_set_mode\fR\|(3), \fBSSL_CTX_new\fR\|(3),
\&\fBSSL_connect\fR\|(3), \fBSSL_accept\fR\|(3)
\&\fBSSL_set_connect_state\fR\|(3),
\&\fBssl\fR\|(3), \fBbio\fR\|(3)

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