342 lines
11 KiB
Groff
342 lines
11 KiB
Groff
.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.32
|
|
.\"
|
|
.\" Standard preamble:
|
|
.\" ========================================================================
|
|
.de Sh \" Subsection heading
|
|
.br
|
|
.if t .Sp
|
|
.ne 5
|
|
.PP
|
|
\fB\\$1\fR
|
|
.PP
|
|
..
|
|
.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. | will give a
|
|
.\" real vertical bar. \*(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-|\(bv\*(Tr
|
|
.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" ''
|
|
'br\}
|
|
.\"
|
|
.\" If the F register is turned on, we'll generate index entries on stderr for
|
|
.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
|
|
.\" entries marked with X<> in POD. Of course, you'll have to process the
|
|
.\" output yourself in some meaningful fashion.
|
|
.if \nF \{\
|
|
. de IX
|
|
. tm Index:\\$1\t\\n%\t"\\$2"
|
|
..
|
|
. nr % 0
|
|
. rr F
|
|
.\}
|
|
.\"
|
|
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
|
|
.\" way too many mistakes in technical documents.
|
|
.hy 0
|
|
.if n .na
|
|
.\"
|
|
.\" 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 "err 3"
|
|
.TH err 3 "2006-07-29" "0.9.8b" "OpenSSL"
|
|
.SH "NAME"
|
|
err \- error codes
|
|
.SH "SYNOPSIS"
|
|
.IX Header "SYNOPSIS"
|
|
.Vb 1
|
|
\& #include <openssl/err.h>
|
|
.Ve
|
|
.PP
|
|
.Vb 8
|
|
\& unsigned long ERR_get_error(void);
|
|
\& unsigned long ERR_peek_error(void);
|
|
\& unsigned long ERR_get_error_line(const char **file, int *line);
|
|
\& unsigned long ERR_peek_error_line(const char **file, int *line);
|
|
\& unsigned long ERR_get_error_line_data(const char **file, int *line,
|
|
\& const char **data, int *flags);
|
|
\& unsigned long ERR_peek_error_line_data(const char **file, int *line,
|
|
\& const char **data, int *flags);
|
|
.Ve
|
|
.PP
|
|
.Vb 3
|
|
\& int ERR_GET_LIB(unsigned long e);
|
|
\& int ERR_GET_FUNC(unsigned long e);
|
|
\& int ERR_GET_REASON(unsigned long e);
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& void ERR_clear_error(void);
|
|
.Ve
|
|
.PP
|
|
.Vb 4
|
|
\& char *ERR_error_string(unsigned long e, char *buf);
|
|
\& const char *ERR_lib_error_string(unsigned long e);
|
|
\& const char *ERR_func_error_string(unsigned long e);
|
|
\& const char *ERR_reason_error_string(unsigned long e);
|
|
.Ve
|
|
.PP
|
|
.Vb 2
|
|
\& void ERR_print_errors(BIO *bp);
|
|
\& void ERR_print_errors_fp(FILE *fp);
|
|
.Ve
|
|
.PP
|
|
.Vb 2
|
|
\& void ERR_load_crypto_strings(void);
|
|
\& void ERR_free_strings(void);
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& void ERR_remove_state(unsigned long pid);
|
|
.Ve
|
|
.PP
|
|
.Vb 3
|
|
\& void ERR_put_error(int lib, int func, int reason, const char *file,
|
|
\& int line);
|
|
\& void ERR_add_error_data(int num, ...);
|
|
.Ve
|
|
.PP
|
|
.Vb 3
|
|
\& void ERR_load_strings(int lib,ERR_STRING_DATA str[]);
|
|
\& unsigned long ERR_PACK(int lib, int func, int reason);
|
|
\& int ERR_get_next_error_library(void);
|
|
.Ve
|
|
.SH "DESCRIPTION"
|
|
.IX Header "DESCRIPTION"
|
|
When a call to the OpenSSL library fails, this is usually signalled
|
|
by the return value, and an error code is stored in an error queue
|
|
associated with the current thread. The \fBerr\fR library provides
|
|
functions to obtain these error codes and textual error messages.
|
|
.PP
|
|
The \fIERR_get_error\fR\|(3) manpage describes how to
|
|
access error codes.
|
|
.PP
|
|
Error codes contain information about where the error occurred, and
|
|
what went wrong. \s-1\fIERR_GET_LIB\s0\fR\|(3) describes how to
|
|
extract this information. A method to obtain human-readable error
|
|
messages is described in \fIERR_error_string\fR\|(3).
|
|
.PP
|
|
\&\fIERR_clear_error\fR\|(3) can be used to clear the
|
|
error queue.
|
|
.PP
|
|
Note that \fIERR_remove_state\fR\|(3) should be used to
|
|
avoid memory leaks when threads are terminated.
|
|
.SH "ADDING NEW ERROR CODES TO OPENSSL"
|
|
.IX Header "ADDING NEW ERROR CODES TO OPENSSL"
|
|
See \fIERR_put_error\fR\|(3) if you want to record error codes in the
|
|
OpenSSL error system from within your application.
|
|
.PP
|
|
The remainder of this section is of interest only if you want to add
|
|
new error codes to OpenSSL or add error codes from external libraries.
|
|
.Sh "Reporting errors"
|
|
.IX Subsection "Reporting errors"
|
|
Each sub-library has a specific macro \fIXXXerr()\fR that is used to report
|
|
errors. Its first argument is a function code \fB\s-1XXX_F_\s0...\fR, the second
|
|
argument is a reason code \fB\s-1XXX_R_\s0...\fR. Function codes are derived
|
|
from the function names; reason codes consist of textual error
|
|
descriptions. For example, the function \fIssl23_read()\fR reports a
|
|
\&\*(L"handshake failure\*(R" as follows:
|
|
.PP
|
|
.Vb 1
|
|
\& SSLerr(SSL_F_SSL23_READ, SSL_R_SSL_HANDSHAKE_FAILURE);
|
|
.Ve
|
|
.PP
|
|
Function and reason codes should consist of upper case characters,
|
|
numbers and underscores only. The error file generation script translates
|
|
function codes into function names by looking in the header files
|
|
for an appropriate function name, if none is found it just uses
|
|
the capitalized form such as \*(L"\s-1SSL23_READ\s0\*(R" in the above example.
|
|
.PP
|
|
The trailing section of a reason code (after the \*(L"_R_\*(R") is translated
|
|
into lower case and underscores changed to spaces.
|
|
.PP
|
|
When you are using new function or reason codes, run \fBmake errors\fR.
|
|
The necessary \fB#define\fRs will then automatically be added to the
|
|
sub\-library's header file.
|
|
.PP
|
|
Although a library will normally report errors using its own specific
|
|
XXXerr macro, another library's macro can be used. This is normally
|
|
only done when a library wants to include \s-1ASN1\s0 code which must use
|
|
the \fIASN1err()\fR macro.
|
|
.Sh "Adding new libraries"
|
|
.IX Subsection "Adding new libraries"
|
|
When adding a new sub-library to OpenSSL, assign it a library number
|
|
\&\fB\s-1ERR_LIB_XXX\s0\fR, define a macro \fIXXXerr()\fR (both in \fBerr.h\fR), add its
|
|
name to \fBERR_str_libraries[]\fR (in \fBcrypto/err/err.c\fR), and add
|
|
\&\f(CW\*(C`ERR_load_XXX_strings()\*(C'\fR to the \fIERR_load_crypto_strings()\fR function
|
|
(in \fBcrypto/err/err_all.c\fR). Finally, add an entry
|
|
.PP
|
|
.Vb 1
|
|
\& L XXX xxx.h xxx_err.c
|
|
.Ve
|
|
.PP
|
|
to \fBcrypto/err/openssl.ec\fR, and add \fBxxx_err.c\fR to the Makefile.
|
|
Running \fBmake errors\fR will then generate a file \fBxxx_err.c\fR, and
|
|
add all error codes used in the library to \fBxxx.h\fR.
|
|
.PP
|
|
Additionally the library include file must have a certain form.
|
|
Typically it will initially look like this:
|
|
.PP
|
|
.Vb 2
|
|
\& #ifndef HEADER_XXX_H
|
|
\& #define HEADER_XXX_H
|
|
.Ve
|
|
.PP
|
|
.Vb 3
|
|
\& #ifdef __cplusplus
|
|
\& extern "C" {
|
|
\& #endif
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& /* Include files */
|
|
.Ve
|
|
.PP
|
|
.Vb 2
|
|
\& #include <openssl/bio.h>
|
|
\& #include <openssl/x509.h>
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& /* Macros, structures and function prototypes */
|
|
.Ve
|
|
.PP
|
|
.Vb 1
|
|
\& /* BEGIN ERROR CODES */
|
|
.Ve
|
|
.PP
|
|
The \fB\s-1BEGIN\s0 \s-1ERROR\s0 \s-1CODES\s0\fR sequence is used by the error code
|
|
generation script as the point to place new error codes, any text
|
|
after this point will be overwritten when \fBmake errors\fR is run.
|
|
The closing #endif etc will be automatically added by the script.
|
|
.PP
|
|
The generated C error code file \fBxxx_err.c\fR will load the header
|
|
files \fBstdio.h\fR, \fBopenssl/err.h\fR and \fBopenssl/xxx.h\fR so the
|
|
header file must load any additional header files containing any
|
|
definitions it uses.
|
|
.SH "USING ERROR CODES IN EXTERNAL LIBRARIES"
|
|
.IX Header "USING ERROR CODES IN EXTERNAL LIBRARIES"
|
|
It is also possible to use OpenSSL's error code scheme in external
|
|
libraries. The library needs to load its own codes and call the OpenSSL
|
|
error code insertion script \fBmkerr.pl\fR explicitly to add codes to
|
|
the header file and generate the C error code file. This will normally
|
|
be done if the external library needs to generate new \s-1ASN1\s0 structures
|
|
but it can also be used to add more general purpose error code handling.
|
|
.PP
|
|
\&\s-1TBA\s0 more details
|
|
.SH "INTERNALS"
|
|
.IX Header "INTERNALS"
|
|
The error queues are stored in a hash table with one \fB\s-1ERR_STATE\s0\fR
|
|
entry for each pid. \fIERR_get_state()\fR returns the current thread's
|
|
\&\fB\s-1ERR_STATE\s0\fR. An \fB\s-1ERR_STATE\s0\fR can hold up to \fB\s-1ERR_NUM_ERRORS\s0\fR error
|
|
codes. When more error codes are added, the old ones are overwritten,
|
|
on the assumption that the most recent errors are most important.
|
|
.PP
|
|
Error strings are also stored in hash table. The hash tables can
|
|
be obtained by calling ERR_get_err_state_table(void) and
|
|
ERR_get_string_table(void) respectively.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fICRYPTO_set_id_callback\fR\|(3),
|
|
\&\fICRYPTO_set_locking_callback\fR\|(3),
|
|
\&\fIERR_get_error\fR\|(3),
|
|
\&\s-1\fIERR_GET_LIB\s0\fR\|(3),
|
|
\&\fIERR_clear_error\fR\|(3),
|
|
\&\fIERR_error_string\fR\|(3),
|
|
\&\fIERR_print_errors\fR\|(3),
|
|
\&\fIERR_load_crypto_strings\fR\|(3),
|
|
\&\fIERR_remove_state\fR\|(3),
|
|
\&\fIERR_put_error\fR\|(3),
|
|
\&\fIERR_load_strings\fR\|(3),
|
|
\&\fISSL_get_error\fR\|(3)
|