crypto/bio/bio_cb.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include <string.h>
  12 #include <stdlib.h>
  13 #include "bio_local.h"
  14 #include "internal/cryptlib.h"
  15 #include <openssl/err.h>
  16
  17 long BIO_debug_callback(BIO *bio, int cmd, const char *argp,
  18                         int argi, long argl, long ret)
  19 {
  20     BIO *b;
  21     char buf[256];
  22     char *p;
  23     long r = 1;
  24     int len, left;
  25
  26     if (BIO_CB_RETURN & cmd)
  27         r = ret;
  28
  29     len = BIO_snprintf(buf, sizeof(buf), "BIO[%p]: ", (void *)bio);
  30
  31     /* Ignore errors and continue printing the other information. */
  32     if (len < 0)
  33         len = 0;
  34     p = buf + len;
  35     left = sizeof(buf) - len;
  36
  37     switch (cmd) {
  38     case BIO_CB_FREE:
  39         BIO_snprintf(p, left, "Free - %s\n", bio->method->name);
  40         break;
  41     case BIO_CB_READ:
  42         if (bio->method->type & BIO_TYPE_DESCRIPTOR)
  43             BIO_snprintf(p, left, "read(%d,%lu) - %s fd=%d\n",
  44                          bio->num, (unsigned long)argi,
  45                          bio->method->name, bio->num);
  46         else
  47             BIO_snprintf(p, left, "read(%d,%lu) - %s\n",
  48                     bio->num, (unsigned long)argi, bio->method->name);
  49         break;
  50     case BIO_CB_WRITE:
  51         if (bio->method->type & BIO_TYPE_DESCRIPTOR)
  52             BIO_snprintf(p, left, "write(%d,%lu) - %s fd=%d\n",
  53                          bio->num, (unsigned long)argi,
  54                          bio->method->name, bio->num);
  55         else
  56             BIO_snprintf(p, left, "write(%d,%lu) - %s\n",
  57                          bio->num, (unsigned long)argi, bio->method->name);
  58         break;
  59     case BIO_CB_PUTS:
  60         BIO_snprintf(p, left, "puts() - %s\n", bio->method->name);
  61         break;
  62     case BIO_CB_GETS:
  63         BIO_snprintf(p, left, "gets(%lu) - %s\n", (unsigned long)argi,
  64                      bio->method->name);
  65         break;
  66     case BIO_CB_CTRL:
  67         BIO_snprintf(p, left, "ctrl(%lu) - %s\n", (unsigned long)argi,
  68                      bio->method->name);
  69         break;
  70     case BIO_CB_RETURN | BIO_CB_READ:
  71         BIO_snprintf(p, left, "read return %ld\n", ret);
  72         break;
  73     case BIO_CB_RETURN | BIO_CB_WRITE:
  74         BIO_snprintf(p, left, "write return %ld\n", ret);
  75         break;
  76     case BIO_CB_RETURN | BIO_CB_GETS:
  77         BIO_snprintf(p, left, "gets return %ld\n", ret);
  78         break;
  79     case BIO_CB_RETURN | BIO_CB_PUTS:
  80         BIO_snprintf(p, left, "puts return %ld\n", ret);
  81         break;
  82     case BIO_CB_RETURN | BIO_CB_CTRL:
  83         BIO_snprintf(p, left, "ctrl return %ld\n", ret);
  84         break;
  85     default:
  86         BIO_snprintf(p, left, "bio callback - unknown type (%d)\n", cmd);
  87         break;
  88     }
  89
  90     b = (BIO *)bio->cb_arg;
  91     if (b != NULL)
  92         BIO_write(b, buf, strlen(buf));
  93 #if !defined(OPENSSL_NO_STDIO)
  94     else
  95         fputs(buf, stderr);
  96 #endif
  97     return r;
  98 }