forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
252 lines
9.7 KiB
Groff
252 lines
9.7 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "SSL_WRITE 3"
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.TH SSL_WRITE 3 "2020-04-21" "1.1.1g" "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_write_ex, SSL_write \- write bytes to a TLS/SSL 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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\&
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\& int SSL_write_ex(SSL *s, const void *buf, size_t num, size_t *written);
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\& int SSL_write(SSL *ssl, const 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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\&\fBSSL_write_ex()\fR and \fBSSL_write()\fR write \fBnum\fR bytes from the buffer \fBbuf\fR into
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the specified \fBssl\fR connection. On success \fBSSL_write_ex()\fR will store the number
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of bytes written in \fB*written\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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In the paragraphs below a \*(L"write function\*(R" is defined as one of either
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\&\fBSSL_write_ex()\fR, or \fBSSL_write()\fR.
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.PP
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If necessary, a write function will negotiate a \s-1TLS/SSL\s0 session, if not already
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explicitly performed by \fBSSL_connect\fR\|(3) or \fBSSL_accept\fR\|(3). If the peer
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requests a re-negotiation, it will be performed transparently during
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the write function operation. The behaviour of the write functions 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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\&\fBSSL_set_connect_state\fR\|(3) or \fBSSL_set_accept_state()\fR
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before the first call to a write function.
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.PP
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If the underlying \s-1BIO\s0 is \fBblocking\fR, the write functions will only return, once
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the write operation has been finished or an error occurred.
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.PP
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If the underlying \s-1BIO\s0 is \fBnon-blocking\fR the write functions will also return
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when the underlying \s-1BIO\s0 could not satisfy the needs of the function to continue
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the operation. In this case a call to \fBSSL_get_error\fR\|(3) with the
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return value of the write function will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR
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or \fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. As at any time a re-negotiation is possible, a
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call to a write function can also cause read operations! The calling process
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then must repeat the call after taking appropriate action to satisfy the needs
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of the write function. 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 \fBselect()\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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.PP
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The write functions will only return with success when the complete contents of
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\&\fBbuf\fR of length \fBnum\fR has been written. This default behaviour can be changed
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with the \s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 option of \fBSSL_CTX_set_mode\fR\|(3). When
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this flag is set the write functions will also return with success when a
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partial write has been successfully completed. In this case the write function
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operation is considered completed. The bytes are sent and a new write call with
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a new buffer (with the already sent bytes removed) must be started. A partial
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write is performed with the size of a message block, which is 16kB.
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.SH "WARNINGS"
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.IX Header "WARNINGS"
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When a write function call has to be repeated because \fBSSL_get_error\fR\|(3)
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returned \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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The data that was passed might have been partially processed.
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When \fB\s-1SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER\s0\fR was set using \fBSSL_CTX_set_mode\fR\|(3)
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the pointer can be different, but the data and length should still be the same.
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.PP
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You should not call \fBSSL_write()\fR with num=0, it will return an error.
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\&\fBSSL_write_ex()\fR can be called with num=0, but will not send application data to
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the peer.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fBSSL_write_ex()\fR will return 1 for success or 0 for failure. Success means that
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all requested application data bytes have been written to the \s-1SSL\s0 connection or,
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if \s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 is in use, at least 1 application data byte has
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been written to the \s-1SSL\s0 connection. Failure means that not all the requested
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bytes have been written yet (if \s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 is not in use) or
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no bytes could be written to the \s-1SSL\s0 connection (if
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\&\s-1SSL_MODE_ENABLE_PARTIAL_WRITE\s0 is in use). Failures can be retryable (e.g. the
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network write buffer has temporarily filled up) or non-retryable (e.g. a fatal
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network error). In the event of a failure call \fBSSL_get_error\fR\|(3) to find out
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the reason which indicates whether the call is retryable or not.
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.PP
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For \fBSSL_write()\fR 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 write operation was successful, the return value is the number of
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bytes actually written to the \s-1TLS/SSL\s0 connection.
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.IP "<= 0" 4
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.IX Item "<= 0"
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The write operation was not successful, because either the connection was
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closed, an error occurred or action must be taken by the calling process.
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Call \fBSSL_get_error()\fR with the return value \fBret\fR to find out the reason.
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.Sp
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Old documentation indicated a difference between 0 and \-1, and that \-1 was
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retryable.
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You should instead call \fBSSL_get_error()\fR to find out if it's retryable.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBSSL_get_error\fR\|(3), \fBSSL_read_ex\fR\|(3), \fBSSL_read\fR\|(3)
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\&\fBSSL_CTX_set_mode\fR\|(3), \fBSSL_CTX_new\fR\|(3),
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\&\fBSSL_connect\fR\|(3), \fBSSL_accept\fR\|(3)
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\&\fBSSL_set_connect_state\fR\|(3),
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\&\fBssl\fR\|(7), \fBbio\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fBSSL_write_ex()\fR function was added in OpenSSL 1.1.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (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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