static int add_custom_ext_intern(SSL_CTX *ctx, ENDPOINT role,
                                 unsigned int ext_type,
                                 unsigned int context,
                                 SSL_custom_ext_add_cb_ex add_cb,
                                 SSL_custom_ext_free_cb_ex free_cb,
                                 void *add_arg,
                                 SSL_custom_ext_parse_cb_ex parse_cb,
                                 void *parse_arg)
{
    custom_ext_methods *exts = &ctx->cert->custext;
    custom_ext_method *meth, *tmp;
    if (add_cb == NULL && free_cb != NULL)
        return 0;
#ifndef OPENSSL_NO_CT
    if (ext_type == TLSEXT_TYPE_signed_certificate_timestamp
            && (context & SSL_EXT_CLIENT_HELLO) != 0
            && SSL_CTX_ct_is_enabled(ctx))
        return 0;
#endif
    if (SSL_extension_supported(ext_type)
            && ext_type != TLSEXT_TYPE_signed_certificate_timestamp)
        return 0;
    if (ext_type > 0xffff)
        return 0;
    if (custom_ext_find(exts, role, ext_type, NULL))
        return 0;
    tmp = OPENSSL_realloc(exts->meths,
                          (exts->meths_count + 1) * sizeof(custom_ext_method));
    if (tmp == NULL)
        return 0;
    exts->meths = tmp;
    meth = exts->meths + exts->meths_count;
    memset(meth, 0, sizeof(*meth));
    meth->role = role;
    meth->context = context;
    meth->parse_cb = parse_cb;
    meth->add_cb = add_cb;
    meth->free_cb = free_cb;
    meth->ext_type = ext_type;
    meth->add_arg = add_arg;
    meth->parse_arg = parse_arg;
    exts->meths_count++;
    return 1;
}
['static int add_custom_ext_intern(SSL_CTX *ctx, ENDPOINT role,\n                                 unsigned int ext_type,\n                                 unsigned int context,\n                                 SSL_custom_ext_add_cb_ex add_cb,\n                                 SSL_custom_ext_free_cb_ex free_cb,\n                                 void *add_arg,\n                                 SSL_custom_ext_parse_cb_ex parse_cb,\n                                 void *parse_arg)\n{\n    custom_ext_methods *exts = &ctx->cert->custext;\n    custom_ext_method *meth, *tmp;\n    if (add_cb == NULL && free_cb != NULL)\n        return 0;\n#ifndef OPENSSL_NO_CT\n    if (ext_type == TLSEXT_TYPE_signed_certificate_timestamp\n            && (context & SSL_EXT_CLIENT_HELLO) != 0\n            && SSL_CTX_ct_is_enabled(ctx))\n        return 0;\n#endif\n    if (SSL_extension_supported(ext_type)\n            && ext_type != TLSEXT_TYPE_signed_certificate_timestamp)\n        return 0;\n    if (ext_type > 0xffff)\n        return 0;\n    if (custom_ext_find(exts, role, ext_type, NULL))\n        return 0;\n    tmp = OPENSSL_realloc(exts->meths,\n                          (exts->meths_count + 1) * sizeof(custom_ext_method));\n    if (tmp == NULL)\n        return 0;\n    exts->meths = tmp;\n    meth = exts->meths + exts->meths_count;\n    memset(meth, 0, sizeof(*meth));\n    meth->role = role;\n    meth->context = context;\n    meth->parse_cb = parse_cb;\n    meth->add_cb = add_cb;\n    meth->free_cb = free_cb;\n    meth->ext_type = ext_type;\n    meth->add_arg = add_arg;\n    meth->parse_arg = parse_arg;\n    exts->meths_count++;\n    return 1;\n}', 'custom_ext_method *custom_ext_find(const custom_ext_methods *exts,\n                                   ENDPOINT role, unsigned int ext_type,\n                                   size_t *idx)\n{\n    size_t i;\n    custom_ext_method *meth = exts->meths;\n    for (i = 0; i < exts->meths_count; i++, meth++) {\n        if (ext_type == meth->ext_type\n                && (role == ENDPOINT_BOTH || role == meth->role\n                    || meth->role == ENDPOINT_BOTH)) {\n            if (idx != NULL)\n                *idx = i;\n            return meth;\n        }\n    }\n    return NULL;\n}']