SMTP too long line

# SPDX-FileCopyrightText: 2003 Michel Arboi
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.11270");
  script_version("2023-10-31T05:06:37+0000");
  script_tag(name:"last_modification", value:"2023-10-31 05:06:37 +0000 (Tue, 31 Oct 2023)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_name("SMTP too long line");
  script_category(ACT_DENIAL);
  script_copyright("Copyright (C) 2003 Michel Arboi");
  script_family("SMTP problems");
  script_dependencies("smtpserver_detect.nasl", "check_smtp_helo.nasl", "smtp_settings.nasl", "smtp_relay.nasl");
  script_require_ports("Services/smtp", 25, 465, 587);
  script_mandatory_keys("smtp/banner/available");

  script_tag(name:"summary", value:"Some antivirus scanners dies when they process an email with a
  too long string without line breaks.

  Such a message was sent. If there is an antivirus on your MTA, it might have crashed. Please check
  its status right now, as it is not possible to do it remotely.");

  script_tag(name:"solution", value:"Contact the vendor of the antivirus scanner to get an update.");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"remote_probe");

  exit(0);
}

include("smtp_func.inc");
include("misc_func.inc");
include("port_service_func.inc");

fromaddr = smtp_from_header();
toaddr = smtp_to_header();
vtstrings = get_vt_strings();

port = smtp_get_port(default:25);

# Disable the test if the server relays e-mails.
if(get_kb_item("smtp/" + port + "/spam"))
  exit(0);

if(smtp_get_is_marked_wrapped(port:port))
  exit(0);

b = string("From: ", fromaddr, "\r\n", "To: ", toaddr, "\r\n",
           "Subject: ", vtstrings["lowercase"], " test - ignore it\r\n\r\n",
           crap(10000), "\r\n");
n = smtp_send_port(port:port, from:fromaddr, to:toaddr, body:b);
if(n > 0)
  security_message(port:port);