openssl/crypto/err/err_prn.c

/* crypto/err/err_prn.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/lhash.h>
#include <openssl/crypto.h>
#include <openssl/buffer.h>
#include <openssl/err.h>

void ERR_print_errors_cb(int (*cb) (const char *str, size_t len, void *u),
                         void *u)
{
    unsigned long l;
    char buf[256];
    char buf2[4096];
    const char *file, *data;
    int line, flags;
    unsigned long es;

    es = CRYPTO_thread_id();
    while ((l = ERR_get_error_line_data(&file, &line, &data, &flags)) != 0) {
        ERR_error_string_n(l, buf, sizeof buf);
        BIO_snprintf(buf2, sizeof(buf2), "%lu:%s:%s:%d:%s\n", es, buf,
                     file, line, (flags & ERR_TXT_STRING) ? data : "");
        if (cb(buf2, strlen(buf2), u) <= 0)
            break;              /* abort outputting the error report */
    }
}

#ifndef OPENSSL_NO_FP_API
static int print_fp(const char *str, size_t len, void *fp)
{
    BIO bio;

    BIO_set(&bio, BIO_s_file());
    BIO_set_fp(&bio, fp, BIO_NOCLOSE);

    return BIO_printf(&bio, "%s", str);
}

void ERR_print_errors_fp(FILE *fp)
{
    ERR_print_errors_cb(print_fp, fp);
}
#endif

void ERR_error_string_n(unsigned long e, char *buf, size_t len)
{
    char lsbuf[64], fsbuf[64], rsbuf[64];
    const char *ls, *fs, *rs;
    unsigned long l, f, r;

    l = ERR_GET_LIB(e);
    f = ERR_GET_FUNC(e);
    r = ERR_GET_REASON(e);

    ls = ERR_lib_error_string(e);
    fs = ERR_func_error_string(e);
    rs = ERR_reason_error_string(e);

    if (ls == NULL)
        BIO_snprintf(lsbuf, sizeof(lsbuf), "lib(%lu)", l);
    if (fs == NULL)
        BIO_snprintf(fsbuf, sizeof(fsbuf), "func(%lu)", f);
    if (rs == NULL)
        BIO_snprintf(rsbuf, sizeof(rsbuf), "reason(%lu)", r);

    BIO_snprintf(buf, len, "error:%08lX:%s:%s:%s", e, ls ? ls : lsbuf,
                 fs ? fs : fsbuf, rs ? rs : rsbuf);
    if (strlen(buf) == len - 1) {
        /*
         * output may be truncated; make sure we always have 5
         * colon-separated fields, i.e. 4 colons ...
         */
#define NUM_COLONS 4
        if (len > NUM_COLONS) { /* ... if possible */
            int i;
            char *s = buf;

            for (i = 0; i < NUM_COLONS; i++) {
                char *colon = strchr(s, ':');
                if (colon == NULL || colon > &buf[len - 1] - NUM_COLONS + i) {
                    /*
                     * set colon no. i at last possible position (buf[len-1]
                     * is the terminating 0)
                     */
                    colon = &buf[len - 1] - NUM_COLONS + i;
                    *colon = ':';
                }
                s = colon + 1;
            }
        }
    }
}

/* BAD for multi-threading: uses a local buffer if ret == NULL */
/*
 * ERR_error_string_n should be used instead for ret != NULL as
 * ERR_error_string cannot know how large the buffer is
 */
char *ERR_error_string(unsigned long e, char *ret)
{
    static char buf[256];

    if (ret == NULL)
        ret = buf;
    ERR_error_string_n(e, ret, 256);

    return ret;
}