Standard preamble:
========================================================================
..
.... 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 -- \(*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\} . 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.
If the F register is turned on, 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'.
.. .nr rF 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 . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] .\} . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} . 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 . \" corrections for vroff . \" for low resolution devices (crt and lpr) \{\ . 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 .\} ========================================================================
Title "SSL_CTX_set_info_callback 3"
way too many mistakes in technical documents.
\fISSL_set_info_callback() sets the callback function, that can be used to obtain state information for ssl during connection setup and use. When callback is \s-1NULL,\s0 the callback setting currently valid for \fBctx is used.
\fISSL_CTX_get_info_callback() returns a pointer to the currently set information callback function for ctx.
\fISSL_get_info_callback() returns a pointer to the currently set information callback function for ssl.
The callback function is called as callback(\s-1SSL\s0 *ssl, int where, int ret). The where argument specifies information about where (in which context) the callback function was called. If ret is 0, an error condition occurred. If an alert is handled, \s-1SSL_CB_ALERT\s0 is set and ret specifies the alert information.
\fBwhere is a bitmask made up of the following bits:
0
Callback has been called because a new handshake is started.
The current state information can be obtained using the \fISSL_state_string\|(3) family of functions.
The ret information can be evaluated using the \fISSL_alert_type_string\|(3) family of functions.
\fISSL_get_info_callback() returns the current setting.
.Vb 4 void apps_ssl_info_callback(SSL *s, int where, int ret) { const char *str; int w; \& w=where& ~SSL_ST_MASK; \& if (w & SSL_ST_CONNECT) str="SSL_connect"; else if (w & SSL_ST_ACCEPT) str="SSL_accept"; else str="undefined"; \& if (where & SSL_CB_LOOP) { BIO_printf(bio_err,"%s:%s\en",str,SSL_state_string_long(s)); } else if (where & SSL_CB_ALERT) { str=(where & SSL_CB_READ)?"read":"write"; BIO_printf(bio_err,"SSL3 alert %s:%s:%s\en", str, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret)); } else if (where & SSL_CB_EXIT) { if (ret == 0) BIO_printf(bio_err,"%s:failed in %s\en", str,SSL_state_string_long(s)); else if (ret < 0) { BIO_printf(bio_err,"%s:error in %s\en", str,SSL_state_string_long(s)); } } } .Ve