398 lines
12 KiB
Groff
398 lines
12 KiB
Groff
.rn '' }`
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'''
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'''
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.de Sh
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.br
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.if t .Sp
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.ne 5
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.PP
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\fB\\$1\fR
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.PP
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..
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.de Sp
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.if t .sp .5v
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.if n .sp
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..
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.de Ip
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.br
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.ie \\n(.$>=3 .ne \\$3
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.el .ne 3
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.IP "\\$1" \\$2
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..
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.de Vb
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.ft CW
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.nf
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.ne \\$1
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..
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.de Ve
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.ft R
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.fi
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..
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'''
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'''
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''' Set up \*(-- to give an unbreakable dash;
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''' string Tr holds user defined translation string.
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''' Bell System Logo is used as a dummy character.
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'''
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.tr \(*W-|\(bv\*(Tr
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.ie n \{\
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.ds -- \(*W-
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.ds PI pi
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.if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
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.if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
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.ds L" ""
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.ds R" ""
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''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of
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''' \*(L" and \*(R", except that they are used on ".xx" lines,
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''' such as .IP and .SH, which do another additional levels of
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''' double-quote interpretation
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.ds M" """
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.ds N" """""
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.ds T" """""
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.ds L' '
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.ds T' '
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'br\}
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.el\{\
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.ds -- \(em\|
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.tr \*(Tr
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.ds L" ``
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.ds R" ''
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.ds M" ``
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.ds S" ''
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.ds N" ``
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.ds T" ''
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.ds L' `
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.ds R' '
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.ds M' `
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.ds S' '
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.ds N' `
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.ds T' '
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.ds PI \(*p
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'br\}
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.\" If the F register is turned on, we'll generate
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.\" index entries out stderr for the following things:
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.\" TH Title
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.\" SH Header
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.\" Sh Subsection
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.\" Ip Item
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.\" X<> Xref (embedded
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.\" Of course, you have to process the output yourself
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.\" in some meaninful fashion.
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.if \nF \{
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.de IX
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.tm Index:\\$1\t\\n%\t"\\$2"
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..
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.nr % 0
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.rr F
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.\}
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.TH err 3 "0.9.5a" "22/Jul/100" "OpenSSL"
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.UC
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.if n .hy 0
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.if n .na
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.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
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.de CQ \" put $1 in typewriter font
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.ft CW
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'if n "\c
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'if t \\&\\$1\c
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'if n \\&\\$1\c
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'if n \&"
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\\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7
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'.ft R
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..
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.\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2
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. \" AM - accent mark definitions
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.bd B 3
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. \" fudge factors for nroff and troff
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.if n \{\
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. ds #H 0
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. ds #V .8m
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. ds #F .3m
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. ds #[ \f1
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. ds #] \fP
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.\}
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.if t \{\
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. ds #H ((1u-(\\\\n(.fu%2u))*.13m)
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. ds #V .6m
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. ds #F 0
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. ds #[ \&
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. ds #] \&
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.\}
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. \" simple accents for nroff and troff
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.if n \{\
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. ds ' \&
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. ds ` \&
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. ds ^ \&
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. ds , \&
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. ds ~ ~
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. ds ? ?
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. ds ! !
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. ds /
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. ds q
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.\}
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.if t \{\
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. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
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. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
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. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
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. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
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. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
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. ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10'
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. ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m'
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. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
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.\}
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. \" troff and (daisy-wheel) nroff accents
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.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
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.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
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.ds v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#]
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.ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u'
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.ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u'
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.ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#]
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.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
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.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
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.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
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.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
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.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
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.ds ae a\h'-(\w'a'u*4/10)'e
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.ds Ae A\h'-(\w'A'u*4/10)'E
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.ds oe o\h'-(\w'o'u*4/10)'e
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.ds Oe O\h'-(\w'O'u*4/10)'E
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. \" corrections for vroff
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.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
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.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
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. \" for low resolution devices (crt and lpr)
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.if \n(.H>23 .if \n(.V>19 \
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\{\
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. ds : e
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. ds 8 ss
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. ds v \h'-1'\o'\(aa\(ga'
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. ds _ \h'-1'^
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. ds . \h'-1'.
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. ds 3 3
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. ds o a
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. ds d- d\h'-1'\(ga
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. ds D- D\h'-1'\(hy
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. ds th \o'bp'
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. ds Th \o'LP'
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. ds ae ae
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. ds Ae AE
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. ds oe oe
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. ds Oe OE
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.\}
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.rm #[ #] #H #V #F C
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.SH "NAME"
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err \- error codes
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.PP
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.Vb 1
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\& #include <openssl/err.h>
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.Ve
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.Vb 8
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\& unsigned long ERR_get_error(void);
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\& unsigned long ERR_peek_error(void);
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\& unsigned long ERR_get_error_line(const char **file, int *line);
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\& unsigned long ERR_peek_error_line(const char **file, int *line);
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\& unsigned long ERR_get_error_line_data(const char **file, int *line,
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\& const char **data, int *flags);
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\& unsigned long ERR_peek_error_line_data(const char **file, int *line,
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\& const char **data, int *flags);
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.Ve
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.Vb 3
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\& int ERR_GET_LIB(unsigned long e);
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\& int ERR_GET_FUNC(unsigned long e);
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\& int ERR_GET_REASON(unsigned long e);
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.Ve
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.Vb 1
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\& void ERR_clear_error(void);
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.Ve
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.Vb 4
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\& char *ERR_error_string(unsigned long e, char *buf);
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\& const char *ERR_lib_error_string(unsigned long e);
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\& const char *ERR_func_error_string(unsigned long e);
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\& const char *ERR_reason_error_string(unsigned long e);
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.Ve
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.Vb 2
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\& void ERR_print_errors(BIO *bp);
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\& void ERR_print_errors_fp(FILE *fp);
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.Ve
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.Vb 2
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\& void ERR_load_crypto_strings(void);
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\& void ERR_free_strings(void);
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.Ve
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.Vb 1
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\& void ERR_remove_state(unsigned long pid);
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.Ve
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.Vb 3
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\& void ERR_put_error(int lib, int func, int reason, const char *file,
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\& int line);
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\& void ERR_add_error_data(int num, ...);
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.Ve
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.Vb 3
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\& void ERR_load_strings(int lib,ERR_STRING_DATA str[]);
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\& unsigned long ERR_PACK(int lib, int func, int reason);
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\& int ERR_get_next_error_library(void);
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.Ve
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.SH "DESCRIPTION"
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When a call to the OpenSSL library fails, this is usually signalled
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by the return value, and an error code is stored in an error queue
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associated with the current thread. The \fBerr\fR library provides
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functions to obtain these error codes and textual error messages.
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.PP
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The the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage manpage describes how to
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access error codes.
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.PP
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Error codes contain information about where the error occurred, and
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what went wrong. the \fIERR_GET_LIB(3)|ERR_GET_LIB(3)\fR manpage describes how to
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extract this information. A method to obtain human-readable error
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messages is described in the \fIERR_error_string(3)|ERR_error_string(3)\fR manpage.
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.PP
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the \fIERR_clear_error(3)|ERR_clear_error(3)\fR manpage can be used to clear the
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error queue.
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.PP
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Note that the \fIERR_remove_state(3)|ERR_remove_state(3)\fR manpage should be used to
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avoid memory leaks when threads are terminated.
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.SH "ADDING NEW ERROR CODES TO OPENSSL"
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See the \fIERR_put_error(3)\fR manpage if you want to record error codes in the
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OpenSSL error system from within your application.
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.PP
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The remainder of this section is of interest only if you want to add
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new error codes to OpenSSL or add error codes from external libraries.
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.Sh "Reporting errors"
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Each sub-library has a specific macro \fIXXXerr()\fR that is used to report
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errors. Its first argument is a function code \fB\s-1XXX_F_\s0...\fR, the second
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argument is a reason code \fB\s-1XXX_R_\s0...\fR. Function codes are derived
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from the function names; reason codes consist of textual error
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descriptions. For example, the function \fIssl23_read()\fR reports a
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\*(L"handshake failure\*(R" as follows:
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.PP
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.Vb 1
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\& SSLerr(SSL_F_SSL23_READ, SSL_R_SSL_HANDSHAKE_FAILURE);
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.Ve
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Function and reason codes should consist of upper case characters,
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numbers and underscores only. The error file generation script translates
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function codes into function names by looking in the header files
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for an appropriate function name, if none is found it just uses
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the capitalized form such as \*(L"\s-1SSL23_READ\s0\*(R" in the above example.
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.PP
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The trailing section of a reason code (after the \*(L"_R_") is translated
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into lower case and underscores changed to spaces.
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.PP
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When you are using new function or reason codes, run \fBmake errors\fR.
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The necessary \fB#define\fRs will then automatically be added to the
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sub-library's header file.
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.PP
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Although a library will normally report errors using its own specific
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XXXerr macro, another library's macro can be used. This is normally
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only done when a library wants to include \s-1ASN1\s0 code which must use
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the \fIASN1err()\fR macro.
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.Sh "Adding new libraries"
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When adding a new sub-library to OpenSSL, assign it a library number
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\fB\s-1ERR_LIB_XXX\s0\fR, define a macro \fIXXXerr()\fR (both in \fBerr.h\fR), add its
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name to \fBERR_str_libraries[]\fR (in \fBcrypto/err/err.c\fR), and add
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\f(CWERR_load_XXX_strings()\fR to the \fIERR_load_crypto_strings()\fR function
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(in \fBcrypto/err/err_all.c\fR). Finally, add an entry
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.PP
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.Vb 1
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\& L XXX xxx.h xxx_err.c
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.Ve
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to \fBcrypto/err/openssl.ec\fR, and add \fBxxx_err.c\fR to the Makefile.
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Running \fBmake errors\fR will then generate a file \fBxxx_err.c\fR, and
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add all error codes used in the library to \fBxxx.h\fR.
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.PP
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Additionally the library include file must have a certain form.
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Typically it will initially look like this:
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.PP
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.Vb 2
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\& #ifndef HEADER_XXX_H
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\& #define HEADER_XXX_H
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.Ve
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.Vb 3
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\& #ifdef __cplusplus
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\& extern "C" {
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\& #endif
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.Ve
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.Vb 1
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\& /* Include files */
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.Ve
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.Vb 2
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\& #include <openssl/bio.h>
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\& #include <openssl/x509.h>
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.Ve
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.Vb 1
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\& /* Macros, structures and function prototypes */
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.Ve
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.Vb 1
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\& /* BEGIN ERROR CODES */
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.Ve
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The \fB\s-1BEGIN\s0 \s-1ERROR\s0 \s-1CODES\s0\fR sequence is used by the error code
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generation script as the point to place new error codes, any text
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after this point will be overwritten when \fBmake errors\fR is run.
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The closing #endif etc will be automatically added by the script.
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.PP
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The generated C error code file \fBxxx_err.c\fR will load the header
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files \fBstdio.h\fR, \fBopenssl/err.h\fR and \fBopenssl/xxx.h\fR so the
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header file must load any additional header files containg any
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definitions it uses.
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.SH "USING ERROR CODES IN EXTERNAL LIBRARIES"
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It is also possible to use OpenSSL's error code scheme in external
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libraries. The library needs to load its own codes and call the OpenSSL
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error code insertion script \fBmkerr.pl\fR explicitly to add codes to
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the header file and generate the C error code file. This will normally
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be done if the external library needs to generate new ASN1 structures
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but it can also be used to add more general purpose error code handling.
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.PP
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TBA more details
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.SH "INTERNALS"
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The error queues are stored in a hash table with one \fBERR_STATE\fR
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entry for each pid. \fIERR_get_state()\fR returns the current thread's
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\fBERR_STATE\fR. An \fBERR_STATE\fR can hold up to \fBERR_NUM_ERRORS\fR error
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codes. When more error codes are added, the old ones are overwritten,
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on the assumption that the most recent errors are most important.
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.PP
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Error strings are also stored in hash table. The hash tables can
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be obtained by calling \fIERR_get_err_state_table\fR\|(void) and
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\fIERR_get_string_table\fR\|(void) respectively.
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.SH "SEE ALSO"
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the \fICRYPTO_set_id_callback(3)|CRYPTO_set_id_callback(3)\fR manpage,
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the section on I<\fICRYPTO_set_locking_callback\fR\|(3)|<\fICRYPTO_set_locking_callback\fR\|(3)>,
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the \fIERR_get_error(3)|ERR_get_error(3)\fR manpage,
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the \fIERR_GET_LIB(3)|ERR_GET_LIB(3)\fR manpage,
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the \fIERR_clear_error(3)|ERR_clear_error(3)\fR manpage,
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the \fIERR_error_string(3)|ERR_error_string(3)\fR manpage,
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the \fIERR_print_errors(3)|ERR_print_errors(3)\fR manpage,
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the \fIERR_load_crypto_strings(3)|ERR_load_crypto_strings(3)\fR manpage,
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the \fIERR_remove_state(3)|ERR_remove_state(3)\fR manpage,
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the \fIERR_put_error(3)|ERR_put_error(3)\fR manpage,
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the \fIERR_load_strings(3)|ERR_load_strings(3)\fR manpage,
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the \fISSL_get_error(3)|SSL_get_error(3)\fR manpage
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.rn }` ''
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.IX Title "err 3"
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.IX Name "err - error codes"
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.IX Header "NAME"
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.IX Header "SYNOPSIS"
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.IX Header "DESCRIPTION"
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.IX Header "ADDING NEW ERROR CODES TO OPENSSL"
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.IX Subsection "Reporting errors"
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.IX Subsection "Adding new libraries"
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.IX Header "USING ERROR CODES IN EXTERNAL LIBRARIES"
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.IX Header "INTERNALS"
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.IX Header "SEE ALSO"
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