If we hit an EOF while reading in libssl then we will report an error
back to the application (SSL_ERROR_SYSCALL) but errno will be 0. We add
an error to the stack (which means we instead return SSL_ERROR_SSL) and
therefore give a hint as to what went wrong.

Contains a partial fix for #10880
Reviewed-by: NTomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: NDmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/10882)

Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9847)

Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9137)

(cherry picked from commit f35819d1b7e195af9a41d991db00655f6f2c0af3)

Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5839)

Reviewed-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2181)

Add -bind option to s_client application to allow specification of
local address for connection.
Reviewed-by: NAndy Polyakov <appro@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5272)

Reviewed-by: NRichard Levitte <levitte@openssl.org>

In commit 52df25cf, the
ERR_load_FOO_strings() functions were moved from their original
location in foo.h into new headers called fooerr.h.  But they were
never removed from their original locations.  This duplication
causes redundant-declaration warnings on programs that use OpenSSL's
headers with such warnings enabled.
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5150)

Mac OS/X has a type for %j that doesn't agree with how we define it,
which gives incorrect warnings.  The easiest way out of that situation
is simply to turn off that check on Mac OS/X.
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5302)

Rename bio_info_cb to BIO_info_cb.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/4493)

This is needed for the upcoming "file" scheme STORE loader.
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3542)

The value of BIO_CTRL_DGRAM_SET_PEEK_MODE was clashing with the value for
BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE. In an SCTP enabled build
BIO_CTRL_DGRAM_SCTP_SET_IN_HANDSHAKE was used unconditionally with
the reasoning that it would be ignored if SCTP wasn't in use. Unfortunately
due to this clash, this wasn't the case. The BIO ended up going into peek
mode and was continually reading the same data over and over - throwing it
away as a replay.

Fixes #3723
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3724)

Run perltidy on util/mkerr
Change some mkerr flags, write some doc comments
Make generated tables "const" when genearting lib-internal ones.
Add "state" file for mkerr
Renerate error tables and headers
Rationalize declaration of ERR_load_XXX_strings
Fix out-of-tree build
Add -static; sort flags/vars for options.
Also tweak code output
Moved engines/afalg to engines (from master)
Use -static flag
Standard engine #include's of errors
Don't linewrap err string tables unless necessary
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3392)

Not exactly everywhere, but in those source files where stdint.h is
included conditionally, or where it will be eventually
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3447)

Fixes #3063.
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3100)

We also change the enum type to an int.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3286)

In order to use SCTP over DTLS we need ACTP AUTH chunks to be enabled in
the kernel.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3286)

The existing BIO_lookup() wraps a call to getaddrinfo and provides an
abstracted capability to lookup addresses based on socket type and family.
However it provides no ability to lookup based on protocol. Normally,
when dealing with TCP/UDP this is not required. However getaddrinfo (at
least on linux) never returns SCTP addresses unless you specifically ask
for them in the protocol field. Therefore BIO_lookup_ex() is added which
provides the protocol field.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3286)

Reviewed-by: NAndy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3064)

Fix some comments too
[skip ci]
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3069)

After the recent reworking, not everything matched up, and some
comments didn't catch up to the outl-->dlen and inl-->dlen renames
that happened during the development of the recent patches.

Try to make parameter names consistent across header, implementation,
and manual pages.

Also remove some trailing whitespace that was inadvertently introduced.
Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1798)

Rename some parameters; add some error codes; fix a comment; etc
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Based on feedback received.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Rename some parameters.
Also change handling of buffer sizes >INT_MAX in length.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Also extend BIO_METHOD to be able to supply an implementation for the new
BIO_write_ex function.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Also extend BIO_METHOD to be able to supply an implementation for the new
BIO_read function.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1520)

Reviewed-by: NRichard Levitte <levitte@openssl.org>

Reviewed-by: NDr. Stephen Henson <steve@openssl.org>

Simplify BIO init using OPENSSL_zalloc().
Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1261)

Reviewed-by: NRichard Levitte <levitte@openssl.org>
GH: #1330

Function-like macros are replaced with prototypes and a note
that they are implemented as macros.  Constants are just
referenced in-line in the text.

Tweak BIO_TYPE_... documentation.

Also fix RT4592.
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NAndy Polyakov <appro@openssl.org>

Add script to find unused err/reason codes
Remove unused reason codes.
Remove entries for unused functions
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NRichard Levitte <levitte@openssl.org>

- Missing checks for allocation failure.
- releasing memory in few missing error paths
Reviewed-by: NKurt Roeckx <kurt@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

Reviewed-by: NRich Salz <rsalz@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>

Link errors were occurring on Windows because the header files were not
correctly guarding some functions with OPENSSL_NO_SOCK
Reviewed-by: NRich Salz <rsalz@openssl.org>