forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
436 lines
15 KiB
Groff
436 lines
15 KiB
Groff
.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42)
|
|
.\"
|
|
.\" 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. Of course, you'll have to process the
|
|
.\" output yourself in some meaningful fashion.
|
|
.\"
|
|
.\" Avoid warning from groff about undefined register 'F'.
|
|
.de IX
|
|
..
|
|
.nr rF 0
|
|
.if \n(.g .if rF .nr rF 1
|
|
.if (\n(rF:(\n(.g==0)) \{\
|
|
. if \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
..
|
|
. if !\nF==2 \{\
|
|
. nr % 0
|
|
. nr F 2
|
|
. \}
|
|
. \}
|
|
.\}
|
|
.rr rF
|
|
.\"
|
|
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
|
|
.\" Fear. Run. Save yourself. No user-serviceable parts.
|
|
. \" fudge factors for nroff and troff
|
|
.if n \{\
|
|
. ds #H 0
|
|
. ds #V .8m
|
|
. ds #F .3m
|
|
. ds #[ \f1
|
|
. ds #] \fP
|
|
.\}
|
|
.if t \{\
|
|
. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
|
|
. ds #V .6m
|
|
. ds #F 0
|
|
. ds #[ \&
|
|
. ds #] \&
|
|
.\}
|
|
. \" simple accents for nroff and troff
|
|
.if n \{\
|
|
. ds ' \&
|
|
. ds ` \&
|
|
. ds ^ \&
|
|
. ds , \&
|
|
. ds ~ ~
|
|
. ds /
|
|
.\}
|
|
.if t \{\
|
|
. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
|
|
. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
|
|
. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
|
|
. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
|
|
. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
|
|
. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
|
|
.\}
|
|
. \" troff and (daisy-wheel) nroff accents
|
|
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
|
|
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
|
|
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
|
|
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
|
|
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
|
|
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
|
|
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
|
|
.ds ae a\h'-(\w'a'u*4/10)'e
|
|
.ds Ae A\h'-(\w'A'u*4/10)'E
|
|
. \" corrections for vroff
|
|
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
|
|
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
|
|
. \" for low resolution devices (crt and lpr)
|
|
.if \n(.H>23 .if \n(.V>19 \
|
|
\{\
|
|
. ds : e
|
|
. ds 8 ss
|
|
. ds o a
|
|
. ds d- d\h'-1'\(ga
|
|
. ds D- D\h'-1'\(hy
|
|
. ds th \o'bp'
|
|
. ds Th \o'LP'
|
|
. ds ae ae
|
|
. ds Ae AE
|
|
.\}
|
|
.rm #[ #] #H #V #F C
|
|
.\" ========================================================================
|
|
.\"
|
|
.IX Title "BIO_F_SSL 3"
|
|
.TH BIO_F_SSL 3 "2020-04-21" "1.1.1g" "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"
|
|
BIO_do_handshake, BIO_f_ssl, BIO_set_ssl, BIO_get_ssl, BIO_set_ssl_mode, BIO_set_ssl_renegotiate_bytes, BIO_get_num_renegotiates, BIO_set_ssl_renegotiate_timeout, BIO_new_ssl, BIO_new_ssl_connect, BIO_new_buffer_ssl_connect, BIO_ssl_copy_session_id, BIO_ssl_shutdown \- SSL BIO
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 2
|
|
\& #include <openssl/bio.h>
|
|
\& #include <openssl/ssl.h>
|
|
\&
|
|
\& const BIO_METHOD *BIO_f_ssl(void);
|
|
\&
|
|
\& long BIO_set_ssl(BIO *b, SSL *ssl, long c);
|
|
\& long BIO_get_ssl(BIO *b, SSL **sslp);
|
|
\& long BIO_set_ssl_mode(BIO *b, long client);
|
|
\& long BIO_set_ssl_renegotiate_bytes(BIO *b, long num);
|
|
\& long BIO_set_ssl_renegotiate_timeout(BIO *b, long seconds);
|
|
\& long BIO_get_num_renegotiates(BIO *b);
|
|
\&
|
|
\& BIO *BIO_new_ssl(SSL_CTX *ctx, int client);
|
|
\& BIO *BIO_new_ssl_connect(SSL_CTX *ctx);
|
|
\& BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx);
|
|
\& int BIO_ssl_copy_session_id(BIO *to, BIO *from);
|
|
\& void BIO_ssl_shutdown(BIO *bio);
|
|
\&
|
|
\& long BIO_do_handshake(BIO *b);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
\&\fBBIO_f_ssl()\fR returns the \s-1SSL BIO\s0 method. This is a filter \s-1BIO\s0 which
|
|
is a wrapper round the OpenSSL \s-1SSL\s0 routines adding a \s-1BIO\s0 \*(L"flavour\*(R" to
|
|
\&\s-1SSL I/O.\s0
|
|
.PP
|
|
I/O performed on an \s-1SSL BIO\s0 communicates using the \s-1SSL\s0 protocol with
|
|
the SSLs read and write BIOs. If an \s-1SSL\s0 connection is not established
|
|
then an attempt is made to establish one on the first I/O call.
|
|
.PP
|
|
If a \s-1BIO\s0 is appended to an \s-1SSL BIO\s0 using \fBBIO_push()\fR it is automatically
|
|
used as the \s-1SSL\s0 BIOs read and write BIOs.
|
|
.PP
|
|
Calling \fBBIO_reset()\fR on an \s-1SSL BIO\s0 closes down any current \s-1SSL\s0 connection
|
|
by calling \fBSSL_shutdown()\fR. \fBBIO_reset()\fR is then sent to the next \s-1BIO\s0 in
|
|
the chain: this will typically disconnect the underlying transport.
|
|
The \s-1SSL BIO\s0 is then reset to the initial accept or connect state.
|
|
.PP
|
|
If the close flag is set when an \s-1SSL BIO\s0 is freed then the internal
|
|
\&\s-1SSL\s0 structure is also freed using \fBSSL_free()\fR.
|
|
.PP
|
|
\&\fBBIO_set_ssl()\fR sets the internal \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR to \fBssl\fR using
|
|
the close flag \fBc\fR.
|
|
.PP
|
|
\&\fBBIO_get_ssl()\fR retrieves the \s-1SSL\s0 pointer of \s-1BIO\s0 \fBb\fR, it can then be
|
|
manipulated using the standard \s-1SSL\s0 library functions.
|
|
.PP
|
|
\&\fBBIO_set_ssl_mode()\fR sets the \s-1SSL BIO\s0 mode to \fBclient\fR. If \fBclient\fR
|
|
is 1 client mode is set. If \fBclient\fR is 0 server mode is set.
|
|
.PP
|
|
\&\fBBIO_set_ssl_renegotiate_bytes()\fR sets the renegotiate byte count
|
|
to \fBnum\fR. When set after every \fBnum\fR bytes of I/O (read and write)
|
|
the \s-1SSL\s0 session is automatically renegotiated. \fBnum\fR must be at
|
|
least 512 bytes.
|
|
.PP
|
|
\&\fBBIO_set_ssl_renegotiate_timeout()\fR sets the renegotiate timeout to
|
|
\&\fBseconds\fR. When the renegotiate timeout elapses the session is
|
|
automatically renegotiated.
|
|
.PP
|
|
\&\fBBIO_get_num_renegotiates()\fR returns the total number of session
|
|
renegotiations due to I/O or timeout.
|
|
.PP
|
|
\&\fBBIO_new_ssl()\fR allocates an \s-1SSL BIO\s0 using \s-1SSL_CTX\s0 \fBctx\fR and using
|
|
client mode if \fBclient\fR is non zero.
|
|
.PP
|
|
\&\fBBIO_new_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting of an
|
|
\&\s-1SSL BIO\s0 (using \fBctx\fR) followed by a connect \s-1BIO.\s0
|
|
.PP
|
|
\&\fBBIO_new_buffer_ssl_connect()\fR creates a new \s-1BIO\s0 chain consisting
|
|
of a buffering \s-1BIO,\s0 an \s-1SSL BIO\s0 (using \fBctx\fR) and a connect
|
|
\&\s-1BIO.\s0
|
|
.PP
|
|
\&\fBBIO_ssl_copy_session_id()\fR copies an \s-1SSL\s0 session id between
|
|
\&\s-1BIO\s0 chains \fBfrom\fR and \fBto\fR. It does this by locating the
|
|
\&\s-1SSL\s0 BIOs in each chain and calling \fBSSL_copy_session_id()\fR on
|
|
the internal \s-1SSL\s0 pointer.
|
|
.PP
|
|
\&\fBBIO_ssl_shutdown()\fR closes down an \s-1SSL\s0 connection on \s-1BIO\s0
|
|
chain \fBbio\fR. It does this by locating the \s-1SSL BIO\s0 in the
|
|
chain and calling \fBSSL_shutdown()\fR on its internal \s-1SSL\s0
|
|
pointer.
|
|
.PP
|
|
\&\fBBIO_do_handshake()\fR attempts to complete an \s-1SSL\s0 handshake on the
|
|
supplied \s-1BIO\s0 and establish the \s-1SSL\s0 connection. It returns 1
|
|
if the connection was established successfully. A zero or negative
|
|
value is returned if the connection could not be established, the
|
|
call \fBBIO_should_retry()\fR should be used for non blocking connect BIOs
|
|
to determine if the call should be retried. If an \s-1SSL\s0 connection has
|
|
already been established this call has no effect.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
\&\s-1SSL\s0 BIOs are exceptional in that if the underlying transport
|
|
is non blocking they can still request a retry in exceptional
|
|
circumstances. Specifically this will happen if a session
|
|
renegotiation takes place during a \fBBIO_read_ex()\fR operation, one
|
|
case where this happens is when step up occurs.
|
|
.PP
|
|
The \s-1SSL\s0 flag \s-1SSL_AUTO_RETRY\s0 can be
|
|
set to disable this behaviour. That is when this flag is set
|
|
an \s-1SSL BIO\s0 using a blocking transport will never request a
|
|
retry.
|
|
.PP
|
|
Since unknown \fBBIO_ctrl()\fR operations are sent through filter
|
|
BIOs the servers name and port can be set using \fBBIO_set_host()\fR
|
|
on the \s-1BIO\s0 returned by \fBBIO_new_ssl_connect()\fR without having
|
|
to locate the connect \s-1BIO\s0 first.
|
|
.PP
|
|
Applications do not have to call \fBBIO_do_handshake()\fR but may wish
|
|
to do so to separate the handshake process from other I/O
|
|
processing.
|
|
.PP
|
|
\&\fBBIO_set_ssl()\fR, \fBBIO_get_ssl()\fR, \fBBIO_set_ssl_mode()\fR,
|
|
\&\fBBIO_set_ssl_renegotiate_bytes()\fR, \fBBIO_set_ssl_renegotiate_timeout()\fR,
|
|
\&\fBBIO_get_num_renegotiates()\fR, and \fBBIO_do_handshake()\fR are implemented as macros.
|
|
.SH "RETURN VALUES"
|
|
.IX Header "RETURN VALUES"
|
|
\&\fBBIO_f_ssl()\fR returns the \s-1SSL\s0 \fB\s-1BIO_METHOD\s0\fR structure.
|
|
.PP
|
|
\&\fBBIO_set_ssl()\fR, \fBBIO_get_ssl()\fR, \fBBIO_set_ssl_mode()\fR, \fBBIO_set_ssl_renegotiate_bytes()\fR,
|
|
\&\fBBIO_set_ssl_renegotiate_timeout()\fR and \fBBIO_get_num_renegotiates()\fR return 1 on
|
|
success or a value which is less than or equal to 0 if an error occurred.
|
|
.PP
|
|
\&\fBBIO_new_ssl()\fR, \fBBIO_new_ssl_connect()\fR and \fBBIO_new_buffer_ssl_connect()\fR return
|
|
a valid \fB\s-1BIO\s0\fR structure on success or \fB\s-1NULL\s0\fR if an error occurred.
|
|
.PP
|
|
\&\fBBIO_ssl_copy_session_id()\fR returns 1 on success or 0 on error.
|
|
.PP
|
|
\&\fBBIO_do_handshake()\fR returns 1 if the connection was established successfully.
|
|
A zero or negative value is returned if the connection could not be established.
|
|
.SH "EXAMPLES"
|
|
.IX Header "EXAMPLES"
|
|
This \s-1SSL/TLS\s0 client example attempts to retrieve a page from an
|
|
\&\s-1SSL/TLS\s0 web server. The I/O routines are identical to those of the
|
|
unencrypted example in \fBBIO_s_connect\fR\|(3).
|
|
.PP
|
|
.Vb 5
|
|
\& BIO *sbio, *out;
|
|
\& int len;
|
|
\& char tmpbuf[1024];
|
|
\& SSL_CTX *ctx;
|
|
\& SSL *ssl;
|
|
\&
|
|
\& /* XXX Seed the PRNG if needed. */
|
|
\&
|
|
\& ctx = SSL_CTX_new(TLS_client_method());
|
|
\&
|
|
\& /* XXX Set verify paths and mode here. */
|
|
\&
|
|
\& sbio = BIO_new_ssl_connect(ctx);
|
|
\& BIO_get_ssl(sbio, &ssl);
|
|
\& if (ssl == NULL) {
|
|
\& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& /* Don\*(Aqt want any retries */
|
|
\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
|
|
\&
|
|
\& /* XXX We might want to do other things with ssl here */
|
|
\&
|
|
\& /* An empty host part means the loopback address */
|
|
\& BIO_set_conn_hostname(sbio, ":https");
|
|
\&
|
|
\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
|
|
\& if (BIO_do_connect(sbio) <= 0) {
|
|
\& fprintf(stderr, "Error connecting to server\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\& if (BIO_do_handshake(sbio) <= 0) {
|
|
\& fprintf(stderr, "Error establishing SSL connection\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& /* XXX Could examine ssl here to get connection info */
|
|
\&
|
|
\& BIO_puts(sbio, "GET / HTTP/1.0\en\en");
|
|
\& for (;;) {
|
|
\& len = BIO_read(sbio, tmpbuf, 1024);
|
|
\& if (len <= 0)
|
|
\& break;
|
|
\& BIO_write(out, tmpbuf, len);
|
|
\& }
|
|
\& BIO_free_all(sbio);
|
|
\& BIO_free(out);
|
|
.Ve
|
|
.PP
|
|
Here is a simple server example. It makes use of a buffering
|
|
\&\s-1BIO\s0 to allow lines to be read from the \s-1SSL BIO\s0 using BIO_gets.
|
|
It creates a pseudo web page containing the actual request from
|
|
a client and also echoes the request to standard output.
|
|
.PP
|
|
.Vb 5
|
|
\& BIO *sbio, *bbio, *acpt, *out;
|
|
\& int len;
|
|
\& char tmpbuf[1024];
|
|
\& SSL_CTX *ctx;
|
|
\& SSL *ssl;
|
|
\&
|
|
\& /* XXX Seed the PRNG if needed. */
|
|
\&
|
|
\& ctx = SSL_CTX_new(TLS_server_method());
|
|
\& if (!SSL_CTX_use_certificate_file(ctx, "server.pem", SSL_FILETYPE_PEM)
|
|
\& || !SSL_CTX_use_PrivateKey_file(ctx, "server.pem", SSL_FILETYPE_PEM)
|
|
\& || !SSL_CTX_check_private_key(ctx)) {
|
|
\& fprintf(stderr, "Error setting up SSL_CTX\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& /* XXX Other things like set verify locations, EDH temp callbacks. */
|
|
\&
|
|
\& /* New SSL BIO setup as server */
|
|
\& sbio = BIO_new_ssl(ctx, 0);
|
|
\& BIO_get_ssl(sbio, &ssl);
|
|
\& if (ssl == NULL) {
|
|
\& fprintf(stderr, "Can\*(Aqt locate SSL pointer\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& SSL_set_mode(ssl, SSL_MODE_AUTO_RETRY);
|
|
\& bbio = BIO_new(BIO_f_buffer());
|
|
\& sbio = BIO_push(bbio, sbio);
|
|
\& acpt = BIO_new_accept("4433");
|
|
\&
|
|
\& /*
|
|
\& * By doing this when a new connection is established
|
|
\& * we automatically have sbio inserted into it. The
|
|
\& * BIO chain is now \*(Aqswallowed\*(Aq by the accept BIO and
|
|
\& * will be freed when the accept BIO is freed.
|
|
\& */
|
|
\& BIO_set_accept_bios(acpt, sbio);
|
|
\& out = BIO_new_fp(stdout, BIO_NOCLOSE);
|
|
\&
|
|
\& /* Setup accept BIO */
|
|
\& if (BIO_do_accept(acpt) <= 0) {
|
|
\& fprintf(stderr, "Error setting up accept BIO\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& /* We only want one connection so remove and free accept BIO */
|
|
\& sbio = BIO_pop(acpt);
|
|
\& BIO_free_all(acpt);
|
|
\&
|
|
\& if (BIO_do_handshake(sbio) <= 0) {
|
|
\& fprintf(stderr, "Error in SSL handshake\en");
|
|
\& ERR_print_errors_fp(stderr);
|
|
\& exit(1);
|
|
\& }
|
|
\&
|
|
\& BIO_puts(sbio, "HTTP/1.0 200 OK\er\enContent\-type: text/plain\er\en\er\en");
|
|
\& BIO_puts(sbio, "\er\enConnection Established\er\enRequest headers:\er\en");
|
|
\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en");
|
|
\&
|
|
\& for (;;) {
|
|
\& len = BIO_gets(sbio, tmpbuf, 1024);
|
|
\& if (len <= 0)
|
|
\& break;
|
|
\& BIO_write(sbio, tmpbuf, len);
|
|
\& BIO_write(out, tmpbuf, len);
|
|
\& /* Look for blank line signifying end of headers*/
|
|
\& if (tmpbuf[0] == \*(Aq\er\*(Aq || tmpbuf[0] == \*(Aq\en\*(Aq)
|
|
\& break;
|
|
\& }
|
|
\&
|
|
\& BIO_puts(sbio, "\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\er\en");
|
|
\& BIO_puts(sbio, "\er\en");
|
|
\& BIO_flush(sbio);
|
|
\& BIO_free_all(sbio);
|
|
.Ve
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
In OpenSSL before 1.0.0 the \fBBIO_pop()\fR call was handled incorrectly,
|
|
the I/O \s-1BIO\s0 reference count was incorrectly incremented (instead of
|
|
decremented) and dissociated with the \s-1SSL BIO\s0 even if the \s-1SSL BIO\s0 was not
|
|
explicitly being popped (e.g. a pop higher up the chain). Applications which
|
|
included workarounds for this bug (e.g. freeing BIOs more than once) should
|
|
be modified to handle this fix or they may free up an already freed \s-1BIO.\s0
|
|
.SH "COPYRIGHT"
|
|
.IX Header "COPYRIGHT"
|
|
Copyright 2000\-2019 The OpenSSL Project Authors. All Rights Reserved.
|
|
.PP
|
|
Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file \s-1LICENSE\s0 in the source distribution or at
|
|
<https://www.openssl.org/source/license.html>.
|