mirror of
https://github.com/openssl/openssl.git
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188 lines
6.6 KiB
Plaintext
188 lines
6.6 KiB
Plaintext
=pod
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=head1 NAME
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err - Error codes
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=head1 SYNOPSIS
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#include <openssl/err.h>
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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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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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void ERR_clear_error(void);
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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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void ERR_print_errors(BIO *bp);
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void ERR_print_errors_fp(FILE *fp);
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void ERR_load_crypto_strings(void);
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void ERR_free_strings(void);
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void ERR_remove_state(unsigned long pid);
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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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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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=head1 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 B<err> library provides
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functions to obtain these error codes and textual error messages.
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The L<ERR_get_error(3)|ERR_get_error(3)> manpage describes how to
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access error codes.
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Error codes contain information about where the error occurred, and
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what went wrong. L<ERR_GET_LIB(3)|ERR_GET_LIB(3)> 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 L<ERR_error_string(3)|ERR_error_string(3)>.
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L<ERR_clear_error(3)|ERR_clear_error(3)> can be used to clear the
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error queue.
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Note that L<ERR_remove_state(3)|ERR_remove_state(3)> should be used to
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avoid memory leaks when threads are terminated.
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=head1 ADDING NEW ERROR CODES TO OPENSSL
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See L<ERR_put_error(3)> if you want to record error codes in the
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OpenSSL error system from within your application.
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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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=head2 Reporting errors
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Each sub-library has a specific macro XXXerr() that is used to report
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errors. Its first argument is a function code B<XXX_F_...>, the second
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argument is a reason code B<XXX_R_...>. 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 ssl23_read() reports a
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"handshake failure" as follows:
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SSLerr(SSL_F_SSL23_READ, SSL_R_SSL_HANDSHAKE_FAILURE);
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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 "SSL23_READ" in the above example.
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The trailing section of a reason code (after the "_R_") is translated
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into lower case and underscores changed to spaces.
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When you are using new function or reason codes, run B<make errors>.
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The necessary B<#define>s will then automatically be added to the
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sub-library's header file.
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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 ASN1 code which must use
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the ASN1err() macro.
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=head2 Adding new libraries
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When adding a new sub-library to OpenSSL, assign it a library number
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B<ERR_LIB_XXX>, define a macro XXXerr() (both in B<err.h>), add its
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name to B<ERR_str_libraries[]> (in B<crypto/err/err.c>), and add
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C<ERR_load_XXX_strings()> to the ERR_load_crypto_strings() function
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(in B<crypto/err/err_all.c>). Finally, add an entry
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L XXX xxx.h xxx_err.c
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to B<crypto/err/openssl.ec>, and add B<xxx_err.c> to the Makefile.
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Running B<make errors> will then generate a file B<xxx_err.c>, and
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add all error codes used in the library to B<xxx.h>.
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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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#ifndef HEADER_XXX_H
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#define HEADER_XXX_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Include files */
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#include <openssl/bio.h>
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#include <openssl/x509.h>
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/* Macros, structures and function prototypes */
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/* BEGIN ERROR CODES */
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The B<BEGIN ERROR CODES> 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 B<make errors> is run.
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The closing #endif etc will be automatically added by the script.
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The generated C error code file B<xxx_err.c> will load the header
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files B<stdio.h>, B<openssl/err.h> and B<openssl/xxx.h> 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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=head1 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 B<mkerr.pl> 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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TBA more details
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=head1 INTERNALS
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The error queues are stored in a hash table with one B<ERR_STATE>
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entry for each pid. ERR_get_state() returns the current thread's
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B<ERR_STATE>. An B<ERR_STATE> can hold up to B<ERR_NUM_ERRORS> 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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Error strings are also stored in hash table. The hash tables can
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be obtained by calling ERR_get_err_state_table(void) and
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ERR_get_string_table(void) respectively.
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=head1 SEE ALSO
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L<CRYPTO_set_id_callback(3)|CRYPTO_set_id_callback(3)>,
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L<CRYPTO_set_locking_callback(3)|<CRYPTO_set_locking_callback(3)>,
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L<ERR_get_error(3)|ERR_get_error(3)>,
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L<ERR_GET_LIB(3)|ERR_GET_LIB(3)>,
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L<ERR_clear_error(3)|ERR_clear_error(3)>,
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L<ERR_error_string(3)|ERR_error_string(3)>,
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L<ERR_print_errors(3)|ERR_print_errors(3)>,
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L<ERR_load_crypto_strings(3)|ERR_load_crypto_strings(3)>,
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L<ERR_remove_state(3)|ERR_remove_state(3)>,
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L<ERR_put_error(3)|ERR_put_error(3)>,
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L<ERR_load_strings(3)|ERR_load_strings(3)>,
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L<SSL_get_error(3)|SSL_get_error(3)>
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=cut
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