From 6782e5fdd885cbd09ecbc063f3c1116c2962ecae Mon Sep 17 00:00:00 2001 From: Matt Caswell Date: Fri, 21 Oct 2016 16:16:20 +0100 Subject: [PATCH] Updates various man pages based on review feedback received. Improvements to style, grammar etc. Reviewed-by: Rich Salz --- doc/man3/SSL_CTX_set_mode.pod | 6 +- doc/man3/SSL_CTX_set_split_send_fragment.pod | 8 +- doc/man3/SSL_get_error.pod | 6 +- doc/man3/SSL_read.pod | 85 +++++++++----------- doc/man3/SSL_set_connect_state.pod | 2 +- doc/man3/SSL_write.pod | 74 ++++++++--------- 6 files changed, 86 insertions(+), 95 deletions(-) diff --git a/doc/man3/SSL_CTX_set_mode.pod b/doc/man3/SSL_CTX_set_mode.pod index 270a71301c..6b8fad615a 100644 --- a/doc/man3/SSL_CTX_set_mode.pod +++ b/doc/man3/SSL_CTX_set_mode.pod @@ -38,9 +38,9 @@ Allow SSL_write_ex(..., n, &r) to return with 0 < r < n (i.e. report success when just a single record has been written). This works in a similar way for SSL_write(). When not set (the default), SSL_write_ex() or SSL_write() will only report success once the complete chunk was written. Once SSL_write_ex() or -SSL_write() returns successful, r bytes have been written and the next call to -SSL_write_ex() or SSL_write() must only send the n-r bytes left, imitating the -behaviour of write(). +SSL_write() returns successful, B bytes have been written and the next call +to SSL_write_ex() or SSL_write() must only send the n-r bytes left, imitating +the behaviour of write(). =item SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER diff --git a/doc/man3/SSL_CTX_set_split_send_fragment.pod b/doc/man3/SSL_CTX_set_split_send_fragment.pod index b34fefd6f0..4c3e9e6737 100644 --- a/doc/man3/SSL_CTX_set_split_send_fragment.pod +++ b/doc/man3/SSL_CTX_set_split_send_fragment.pod @@ -64,13 +64,13 @@ B. For example if B is set to 2000 and B is 4 then: -SSL_write(_ex) called with 0-2000 bytes == 1 pipeline used +SSL_write/SSL_write_ex called with 0-2000 bytes == 1 pipeline used -SSL_write(_ex) called with 2001-4000 bytes == 2 pipelines used +SSL_write/SSL_write_ex called with 2001-4000 bytes == 2 pipelines used -SSL_write(_ex) called with 4001-6000 bytes == 3 pipelines used +SSL_write/SSL_write_ex called with 4001-6000 bytes == 3 pipelines used -SSL_write(_ex) called with 6001+ bytes == 4 pipelines used +SSL_write/SSL_write_ex called with 6001+ bytes == 4 pipelines used B must always be less than or equal to B. By default it is set to be equal to B. diff --git a/doc/man3/SSL_get_error.pod b/doc/man3/SSL_get_error.pod index d165b888b5..424f6f0e9d 100644 --- a/doc/man3/SSL_get_error.pod +++ b/doc/man3/SSL_get_error.pod @@ -64,11 +64,11 @@ TLS/SSL I/O function should be retried. Caveat: Any TLS/SSL I/O function can lead to either of B and B. In particular, -SSL_read_ex(), SSL_read() SSL_peek_ex() or SSL_peek() may want to write data and -SSL_write() or SSL_write_ex() may want to read data. This is mainly because +SSL_read_ex(), SSL_read(), SSL_peek_ex(), or SSL_peek() may want to write data +and SSL_write() or SSL_write_ex() may want to read data. This is mainly because TLS/SSL handshakes may occur at any time during the protocol (initiated by either the client or the server); SSL_read_ex(), SSL_read(), SSL_peek_ex(), -SSL_peek(), SSL_write_ex() and SSL_write() will handle any pending handshakes. +SSL_peek(), SSL_write_ex(), and SSL_write() will handle any pending handshakes. =item SSL_ERROR_WANT_CONNECT, SSL_ERROR_WANT_ACCEPT diff --git a/doc/man3/SSL_read.pod b/doc/man3/SSL_read.pod index fa3583e552..e97d5ba050 100644 --- a/doc/man3/SSL_read.pod +++ b/doc/man3/SSL_read.pod @@ -23,71 +23,66 @@ actually read in B<*read>. SSL_peek_ex() and SSL_peek() are identical to SSL_read_ex() and SSL_read() respectively except no bytes are actually removed from the underlying BIO during the read, so that a subsequent call to SSL_read_ex() or SSL_read() will yield -the same bytes. +at least the same bytes. =head1 NOTES -In this notes section all comments that apply to SSL_read_ex() or SSL_read() -also apply to SSL_peek_ex() and SSL_peek(). +In the paragraphs below a "read function" is defined as one of SSL_read_ex(), +SSL_read(), SSL_peek_ex() or SSL_peek(). -If necessary, SSL_read_ex() or SSL_read() will negotiate a TLS/SSL session, if -not already explicitly performed by L or -L. If the +If necessary, a read function will negotiate a TLS/SSL session, if not already +explicitly performed by L or L. If the peer requests a re-negotiation, it will be performed transparently during -the SSL_read_ex() or SSL_read() operation. The behaviour of SSL_read_ex() and -SSL_read() depends on the underlying BIO. +the read function operation. The behaviour of the read functions depends on the +underlying BIO. For the transparent negotiation to succeed, the B must have been initialized to client or server mode. This is being done by calling -L or SSL_set_accept_state() -before the first call to an SSL_read_ex(), SSL_read(), L or -L function. - -SSL_read_ex() and SSL_read() work based on the SSL/TLS records. The data are -received in records (with a maximum record size of 16kB for SSLv3/TLSv1). Only -when a record has been completely received, it can be processed (decryption and -check of integrity). Therefore data that was not retrieved at the last -call of SSL_read_ex() or SSL_read() can still be buffered inside the SSL layer -and will be retrieved on the next call to SSL_read_ex() or SSL_read(). If B -is higher than the number of bytes buffered, SSL_read_ex() or SSL_read() will -return with the bytes buffered. If no more bytes are in the buffer, SSL_read() -will trigger the processing of the next record. Only when the record has been -received and processed completely, SSL_read_ex() or SSL_read() will return -reporting success. At most the contents of the record will be returned. As the -size of an SSL/TLS record may exceed the maximum packet size of the underlying -transport (e.g. TCP), it may be necessary to read several packets from the -transport layer before the record is complete and SSL_read_ex() or SSL_read() +L or SSL_set_accept_state() before the first +invocation of a read function. + +The read functions work based on the SSL/TLS records. The data are received in +records (with a maximum record size of 16kB). Only when a record has been +completely received, can it be processed (decryption and check of integrity). +Therefore data that was not retrieved at the last read call can still be +buffered inside the SSL layer and will be retrieved on the next read +call. If B is higher than the number of bytes buffered then the read +functions will return with the bytes buffered. If no more bytes are in the +buffer, the read functions will trigger the processing of the next record. +Only when the record has been received and processed completely will the read +functions return reporting success. At most the contents of the record will +be returned. As the size of an SSL/TLS record may exceed the maximum packet size +of the underlying transport (e.g. TCP), it may be necessary to read several +packets from the transport layer before the record is complete and the read call can succeed. -If the underlying BIO is B, SSL_read_ex() or SSL_read() will only -return, once the read operation has been finished or an error occurred, except -when a renegotiation take place, in which case a SSL_ERROR_WANT_READ may occur. -This behaviour can be controlled with the SSL_MODE_AUTO_RETRY flag of the +If the underlying BIO is B, a read function will only return once the +read operation has been finished or an error occurred, except when a +renegotiation takes place, in which case a SSL_ERROR_WANT_READ may occur. This +behaviour can be controlled with the SSL_MODE_AUTO_RETRY flag of the L call. -If the underlying BIO is B, SSL_read_ex() or SSL_read() will also -return when the underlying BIO could not satisfy the needs of SSL_read_ex() or -SSL_read() to continue the operation. In this case a call to -L with the -return value of SSL_read_ex() or SSL_read() will yield B or +If the underlying BIO is B, a read function will also return when +the underlying BIO could not satisfy the needs of the function to continue the +operation. In this case a call to L with the +return value of the read function will yield B or B. As at any time a re-negotiation is possible, a -call to SSL_read_ex() or SSL_read() can also cause write operations! The calling -process then must repeat the call after taking appropriate action to satisfy the -needs of SSL_read_ex() or SSL_read(). The action depends on the underlying BIO. -When using a non-blocking socket, nothing is to be done, but select() can be -used to check for the required condition. When using a buffering BIO, like a -BIO pair, data must be written into or retrieved out of the BIO before being -able to continue. +a read function can also cause write operations! The calling process then must +repeat the call after taking appropriate action to satisfy the needs of the read +function. The action depends on the underlying BIO. When using a non-blocking +socket, nothing is to be done, but select() can be used to check for the +required condition. When using a buffering BIO, like a BIO pair, data must be +written into or retrieved out of the BIO before being able to continue. L can be used to find out whether there are buffered bytes available for immediate retrieval. In this case -SSL_read_ex() or SSL_read() can be called without blocking or actually receiving +the read function can be called without blocking or actually receiving new data from the underlying socket. =head1 WARNING -When an SSL_read_ex() or SSL_read() operation has to be repeated because of -B or B, it must be repeated +When a read function operation has to be repeated because L +returned B or B, it must be repeated with the same arguments. =head1 RETURN VALUES diff --git a/doc/man3/SSL_set_connect_state.pod b/doc/man3/SSL_set_connect_state.pod index 1fe7040a02..1f44f594be 100644 --- a/doc/man3/SSL_set_connect_state.pod +++ b/doc/man3/SSL_set_connect_state.pod @@ -35,7 +35,7 @@ requested, the handshake routines must be explicitly set. When using the L or L routines, the correct handshake routines are automatically set. When performing a transparent negotiation -using L, L L or L, +using L, L, L, or L, the handshake routines must be explicitly set in advance using either SSL_set_connect_state() or SSL_set_accept_state(). diff --git a/doc/man3/SSL_write.pod b/doc/man3/SSL_write.pod index 45b34a4ff7..98d691a26c 100644 --- a/doc/man3/SSL_write.pod +++ b/doc/man3/SSL_write.pod @@ -19,59 +19,55 @@ of bytes written in B<*written>. =head1 NOTES -If necessary, SSL_write_ex() or SSL_write() will negotiate a TLS/SSL session, if -not already explicitly performed by L or -L. If the -peer requests a re-negotiation, it will be performed transparently during -the SSL_write_ex() or SSL_write() operation. The behaviour of SSL_write_ex() or -SSL_write() depends on the underlying BIO. +In the paragraphs below a "write function" is defined as one of either +SSL_write_ex(), or SSL_write(). + +If necessary, a write function will negotiate a TLS/SSL session, if not already +explicitly performed by L or L. If the peer +requests a re-negotiation, it will be performed transparently during +the write functio operation. The behaviour of the write functions depends on the +underlying BIO. For the transparent negotiation to succeed, the B must have been initialized to client or server mode. This is being done by calling L or SSL_set_accept_state() -before the first call to an L, L, SSL_write_ex() or -SSL_write() function. +before the first call to a write function. -If the underlying BIO is B, SSL_write_ex() and SSL_write() will only -return, once the write operation has been finished or an error occurred, except -when a renegotiation take place, in which case a SSL_ERROR_WANT_READ may occur. +If the underlying BIO is B, the write functions will only return, once +the write operation has been finished or an error occurred, except when a +renegotiation take place, in which case a SSL_ERROR_WANT_READ may occur. This behaviour can be controlled with the SSL_MODE_AUTO_RETRY flag of the L call. -If the underlying BIO is B, SSL_write_ex() or SSL_write() will -also return, when the underlying BIO could not satisfy the needs of -SSL_write_ex() or SSL_write() to continue the operation. In this case a call to -L with the -return value of SSL_write_ex() or SSL_write() will yield B +If the underlying BIO is B the write functions will also return +when the underlying BIO could not satisfy the needs of the function to continue +the operation. In this case a call to L with the +return value of the write function will yield B or B. As at any time a re-negotiation is possible, a -call to SSL_write_ex() or SSL_write() can also cause read operations! The -calling process then must repeat the call after taking appropriate action to -satisfy the needs of SSL_write_ex() or SSL_write(). The action depends on the -underlying BIO. When using a non-blocking socket, nothing is to be done, but -select() can be used to check for the required condition. When using a buffering -BIO, like a BIO pair, data must be written into or retrieved out of the BIO -before being able to continue. - -SSL_write_ex() or SSL_write() will only return with success, when the complete -contents of B of length B has been written. This default behaviour -can be changed with the SSL_MODE_ENABLE_PARTIAL_WRITE option of -L. When this flag is set, -SSL_write_ex() or SSL_write() will also return with success, when a partial -write has been successfully completed. In this case the SSL_write_ex() or -SSL_write() operation is considered completed. The bytes are sent and a new -SSL_write_ex() or SSL_write() 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. +call to a write function can also cause read operations! The calling process +then must repeat the call after taking appropriate action to satisfy the needs +of the write function. The action depends on the underlying BIO. When using a +non-blocking socket, nothing is to be done, but select() can be used to check +for the required condition. When using a buffering BIO, like a BIO pair, data +must be written into or retrieved out of the BIO before being able to continue. + +The write functions will only return with success when the complete contents of +B of length B has been written. This default behaviour can be changed +with the SSL_MODE_ENABLE_PARTIAL_WRITE option of L. When +this flag is set the write functions will also return with success when a +partial write has been successfully completed. In this case the write function +operation is considered completed. The bytes are sent and a new write call 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. =head1 WARNING -When an SSL_write_ex() or SSL_write() operation has to be repeated because of -B or B, it must be repeated +When a write function call has to be repeated because L +returned B or B, it must be repeated with the same arguments. -When calling SSL_write_ex() or SSL_write() with num=0 bytes to be sent the -behaviour is undefined. +When calling the write functions with num=0 bytes to be sent the behaviour is +undefined. =head1 RETURN VALUES -- 2.25.1