1 files changed, 0 insertions, 546 deletions

diff --git a/src/nat/gnunet-helper-nat-client.c b/src/nat/gnunet-helper-nat-client.c
deleted file mode 100644
index 0271d6e0f..000000000
--- a/src/nat/gnunet-helper-nat-client.c
+++ /dev/null
@@ -1,546 +0,0 @@
-/*
-     This file is part of GNUnet.
-     Copyright (C) 2010 GNUnet e.V.
-
-     GNUnet is free software: you can redistribute it and/or modify it
-     under the terms of the GNU Affero General Public License as published
-     by the Free Software Foundation, either version 3 of the License,
-     or (at your option) any later version.
-
-     GNUnet is distributed in the hope that it will be useful, but
-     WITHOUT ANY WARRANTY; without even the implied warranty of
-     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-     Affero General Public License for more details.
-
-     You should have received a copy of the GNU Affero General Public License
-     along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-     SPDX-License-Identifier: AGPL3.0-or-later
- */
-
-/**
- * @file src/nat/gnunet-helper-nat-client.c
- * @brief Tool to help bypass NATs using ICMP method; must run as root (SUID will do)
- *        This code will work under GNU/Linux only.
- * @author Christian Grothoff
- *
- * This program will send ONE ICMP message using RAW sockets
- * to the IP address specified as the second argument.  Since
- * it uses RAW sockets, it must be installed SUID or run as 'root'.
- * In order to keep the security risk of the resulting SUID binary
- * minimal, the program ONLY opens the RAW socket with root
- * privileges, then drops them and only then starts to process
- * command line arguments.  The code also does not link against
- * any shared libraries (except libc) and is strictly minimal
- * (except for checking for errors).  The following list of people
- * have reviewed this code and considered it safe since the last
- * modification (if you reviewed it, please have your name added
- * to the list):
- *
- * - Christian Grothoff
- * - Nathan Evans
- * - Benjamin Kuperman (22 Aug 2010)
- */
-#if HAVE_CONFIG_H
-/* Just needed for HAVE_SOCKADDR_IN_SIN_LEN test macro! */
-#include "gnunet_config.h"
-#else
-#define _GNU_SOURCE
-#endif
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <arpa/inet.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <netinet/ip.h>
-#include <netinet/ip_icmp.h>
-#include <netinet/in.h>
-
-/* The following constant is missing from FreeBSD 9.2 */
-#ifndef ICMP_TIME_EXCEEDED
-#define ICMP_TIME_EXCEEDED 11
-#endif
-
-/**
- * Call memcpy() but check for @a n being 0 first. In the latter
- * case, it is now safe to pass NULL for @a src or @a dst.
- * Unlike traditional memcpy(), returns nothing.
- *
- * @param dst destination of the copy, may be NULL if @a n is zero
- * @param src source of the copy, may be NULL if @a n is zero
- * @param n number of bytes to copy
- */
-#define GNUNET_memcpy(dst, src, n) do { if (0 != n) { (void) memcpy (dst, src, \
-                                                                     n); \
-                                        } } while (0)
-
-/**
- * Must match IP given in the server.
- */
-#define DUMMY_IP "192.0.2.86"
-
-#define NAT_TRAV_PORT 22225
-
-/**
- * Must match packet ID used by gnunet-helper-nat-server.c
- */
-#define PACKET_ID 256
-
-/**
- * IPv4 header.
- */
-struct ip_header
-{
-  /**
-   * Version (4 bits) + Internet header length (4 bits)
-   */
-  uint8_t vers_ihl;
-
-  /**
-   * Type of service
-   */
-  uint8_t tos;
-
-  /**
-   * Total length
-   */
-  uint16_t pkt_len;
-
-  /**
-   * Identification
-   */
-  uint16_t id;
-
-  /**
-   * Flags (3 bits) + Fragment offset (13 bits)
-   */
-  uint16_t flags_frag_offset;
-
-  /**
-   * Time to live
-   */
-  uint8_t ttl;
-
-  /**
-   * Protocol
-   */
-  uint8_t proto;
-
-  /**
-   * Header checksum
-   */
-  uint16_t checksum;
-
-  /**
-   * Source address
-   */
-  uint32_t src_ip;
-
-  /**
-   * Destination address
-   */
-  uint32_t dst_ip;
-};
-
-/**
- * Format of ICMP packet.
- */
-struct icmp_ttl_exceeded_header
-{
-  uint8_t type;
-
-  uint8_t code;
-
-  uint16_t checksum;
-
-  uint32_t unused;
-
-  /* followed by original payload */
-};
-
-struct icmp_echo_header
-{
-  uint8_t type;
-
-  uint8_t code;
-
-  uint16_t checksum;
-
-  uint32_t reserved;
-};
-
-/**
- * Beginning of UDP packet.
- */
-struct udp_header
-{
-  uint16_t src_port;
-
-  uint16_t dst_port;
-
-  uint16_t length;
-
-  uint16_t crc;
-};
-
-/**
- * Socket we use to send our fake ICMP replies.
- */
-static int rawsock;
-
-/**
- * Target "dummy" address of the packet we pretend to respond to.
- */
-static struct in_addr dummy;
-
-/**
- * Our "source" port.
- */
-static uint16_t port;
-
-
-/**
- * CRC-16 for IP/ICMP headers.
- *
- * @param data what to calculate the CRC over
- * @param bytes number of bytes in data (must be multiple of 2)
- * @return the CRC 16.
- */
-static uint16_t
-calc_checksum (const uint16_t *data, unsigned int bytes)
-{
-  uint32_t sum;
-  unsigned int i;
-
-  sum = 0;
-  for (i = 0; i < bytes / 2; i++)
-    sum += data[i];
-  sum = (sum & 0xffff) + (sum >> 16);
-  sum = htons (0xffff - sum);
-  return sum;
-}
-
-
-/**
- * Send an ICMP message to the target.
- *
- * @param my_ip source address
- * @param other target address
- */
-static void
-send_icmp_udp (const struct in_addr *my_ip, const struct in_addr *other)
-{
-  char packet[sizeof(struct ip_header) * 2
-              + sizeof(struct icmp_ttl_exceeded_header)
-              + sizeof(struct udp_header)];
-  struct ip_header ip_pkt;
-  struct icmp_ttl_exceeded_header icmp_pkt;
-  struct udp_header udp_pkt;
-  struct sockaddr_in dst;
-  size_t off;
-  int err;
-
-  /* ip header: send to (known) ip address */
-  off = 0;
-  ip_pkt.vers_ihl = 0x45;
-  ip_pkt.tos = 0;
-  /* should this be BSD only? */
-#if defined(BSD) && defined(__FreeBSD__) && defined(__FreeBSD_kernel__)
-  ip_pkt.pkt_len = sizeof(packet);  /* Workaround PR kern/21737 */
-#else
-  ip_pkt.pkt_len = htons (sizeof(packet));
-#endif
-  ip_pkt.id = htons (PACKET_ID);
-  ip_pkt.flags_frag_offset = 0;
-  ip_pkt.ttl = 128;
-  ip_pkt.proto = IPPROTO_ICMP;
-  ip_pkt.checksum = 0;
-  ip_pkt.src_ip = my_ip->s_addr;
-  ip_pkt.dst_ip = other->s_addr;
-  ip_pkt.checksum =
-    htons (calc_checksum ((uint16_t *) &ip_pkt, sizeof(struct ip_header)));
-  GNUNET_memcpy (&packet[off],
-                 &ip_pkt,
-                 sizeof(struct ip_header));
-  off += sizeof(struct ip_header);
-
-  icmp_pkt.type = ICMP_TIME_EXCEEDED;
-  icmp_pkt.code = 0;
-  icmp_pkt.checksum = 0;
-  icmp_pkt.unused = 0;
-  GNUNET_memcpy (&packet[off],
-                 &icmp_pkt,
-                 sizeof(struct icmp_ttl_exceeded_header));
-  off += sizeof(struct icmp_ttl_exceeded_header);
-
-  /* ip header of the presumably 'lost' udp packet */
-  ip_pkt.vers_ihl = 0x45;
-  ip_pkt.tos = 0;
-  ip_pkt.pkt_len =
-    htons (sizeof(struct ip_header) + sizeof(struct udp_header));
-  ip_pkt.id = htons (0);
-  ip_pkt.flags_frag_offset = 0;
-  ip_pkt.ttl = 128;
-  ip_pkt.proto = IPPROTO_UDP;
-  ip_pkt.checksum = 0;
-  ip_pkt.src_ip = other->s_addr;
-  ip_pkt.dst_ip = dummy.s_addr;
-  ip_pkt.checksum =
-    htons (calc_checksum ((uint16_t *) &ip_pkt, sizeof(struct ip_header)));
-  GNUNET_memcpy (&packet[off],
-                 &ip_pkt,
-                 sizeof(struct ip_header));
-  off += sizeof(struct ip_header);
-
-  /* build UDP header */
-  udp_pkt.src_port = htons (NAT_TRAV_PORT);
-  udp_pkt.dst_port = htons (NAT_TRAV_PORT);
-  udp_pkt.length = htons (port);
-  udp_pkt.crc = 0;
-  GNUNET_memcpy (&packet[off],
-                 &udp_pkt,
-                 sizeof(struct udp_header));
-  off += sizeof(struct udp_header);
-
-  /* set ICMP checksum */
-  icmp_pkt.checksum =
-    htons (calc_checksum
-             ((uint16_t *) &packet[sizeof(struct ip_header)],
-             sizeof(struct icmp_ttl_exceeded_header)
-             + sizeof(struct ip_header) + sizeof(struct udp_header)));
-  GNUNET_memcpy (&packet[sizeof(struct ip_header)],
-                 &icmp_pkt,
-                 sizeof(struct icmp_ttl_exceeded_header));
-
-  memset (&dst, 0, sizeof(dst));
-  dst.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
-  dst.sin_len = sizeof(struct sockaddr_in);
-#endif
-  dst.sin_addr = *other;
-  err =
-    sendto (rawsock, packet, sizeof(packet), 0, (struct sockaddr *) &dst,
-            sizeof(dst));
-  if (err < 0)
-  {
-    fprintf (stderr, "sendto failed: %s\n", strerror (errno));
-  }
-  else if (sizeof(packet) != (size_t) err)
-  {
-    fprintf (stderr, "Error: partial send of ICMP message with size %lu\n",
-             (unsigned long) off);
-  }
-}
-
-
-/**
- * Send an ICMP message to the target.
- *
- * @param my_ip source address
- * @param other target address
- */
-static void
-send_icmp (const struct in_addr *my_ip, const struct in_addr *other)
-{
-  struct ip_header ip_pkt;
-  struct icmp_ttl_exceeded_header icmp_ttl;
-  struct icmp_echo_header icmp_echo;
-  struct sockaddr_in dst;
-  char packet[sizeof(struct ip_header) * 2
-              + sizeof(struct icmp_ttl_exceeded_header)
-              + sizeof(struct icmp_echo_header)];
-  size_t off;
-  int err;
-
-  /* ip header: send to (known) ip address */
-  off = 0;
-  ip_pkt.vers_ihl = 0x45;
-  ip_pkt.tos = 0;
-#if defined(BSD) && defined(__FreeBSD__) && defined(__FreeBSD_kernel__)
-  ip_pkt.pkt_len = sizeof(packet);  /* Workaround PR kern/21737 */
-#else
-  ip_pkt.pkt_len = htons (sizeof(packet));
-#endif
-  ip_pkt.id = htons (PACKET_ID);
-  ip_pkt.flags_frag_offset = 0;
-  ip_pkt.ttl = IPDEFTTL;
-  ip_pkt.proto = IPPROTO_ICMP;
-  ip_pkt.checksum = 0;
-  ip_pkt.src_ip = my_ip->s_addr;
-  ip_pkt.dst_ip = other->s_addr;
-  ip_pkt.checksum =
-    htons (calc_checksum ((uint16_t *) &ip_pkt, sizeof(struct ip_header)));
-  GNUNET_memcpy (&packet[off],
-                 &ip_pkt,
-                 sizeof(struct ip_header));
-  off = sizeof(ip_pkt);
-
-  /* icmp reply: time exceeded */
-  icmp_ttl.type = ICMP_TIME_EXCEEDED;
-  icmp_ttl.code = 0;
-  icmp_ttl.checksum = 0;
-  icmp_ttl.unused = 0;
-  GNUNET_memcpy (&packet[off],
-                 &icmp_ttl,
-                 sizeof(struct icmp_ttl_exceeded_header));
-  off += sizeof(struct icmp_ttl_exceeded_header);
-
-  /* ip header of the presumably 'lost' udp packet */
-  ip_pkt.vers_ihl = 0x45;
-  ip_pkt.tos = 0;
-  ip_pkt.pkt_len =
-    htons (sizeof(struct ip_header) + sizeof(struct icmp_echo_header));
-  ip_pkt.id = htons (PACKET_ID);
-  ip_pkt.flags_frag_offset = 0;
-  ip_pkt.ttl = 1;               /* real TTL would be 1 on a time exceeded packet */
-  ip_pkt.proto = IPPROTO_ICMP;
-  ip_pkt.src_ip = other->s_addr;
-  ip_pkt.dst_ip = dummy.s_addr;
-  ip_pkt.checksum = 0;
-  ip_pkt.checksum =
-    htons (calc_checksum ((uint16_t *) &ip_pkt, sizeof(struct ip_header)));
-  GNUNET_memcpy (&packet[off],
-                 &ip_pkt,
-                 sizeof(struct ip_header));
-  off += sizeof(struct ip_header);
-
-  icmp_echo.type = ICMP_ECHO;
-  icmp_echo.code = 0;
-  icmp_echo.reserved = htonl (port);
-  icmp_echo.checksum = 0;
-  icmp_echo.checksum =
-    htons (calc_checksum
-             ((uint16_t *) &icmp_echo, sizeof(struct icmp_echo_header)));
-  GNUNET_memcpy (&packet[off],
-                 &icmp_echo,
-                 sizeof(struct icmp_echo_header));
-
-  /* no go back to calculate ICMP packet checksum */
-  off = sizeof(struct ip_header);
-  icmp_ttl.checksum =
-    htons (calc_checksum
-             ((uint16_t *) &packet[off],
-             sizeof(struct icmp_ttl_exceeded_header)
-             + sizeof(struct ip_header) + sizeof(struct icmp_echo_header)));
-  GNUNET_memcpy (&packet[off],
-                 &icmp_ttl,
-                 sizeof(struct icmp_ttl_exceeded_header));
-
-  /* prepare for transmission */
-  memset (&dst, 0, sizeof(dst));
-  dst.sin_family = AF_INET;
-#if HAVE_SOCKADDR_IN_SIN_LEN
-  dst.sin_len = sizeof(struct sockaddr_in);
-#endif
-  dst.sin_addr = *other;
-  err =
-    sendto (rawsock, packet, sizeof(packet), 0, (struct sockaddr *) &dst,
-            sizeof(dst));
-  if (err < 0)
-  {
-    fprintf (stderr, "sendto failed: %s\n", strerror (errno));
-  }
-  else if (sizeof(packet) != (size_t) err)
-  {
-    fprintf (stderr, "Error: partial send of ICMP message\n");
-  }
-}
-
-
-int
-main (int argc, char *const *argv)
-{
-  const int one = 1;
-  struct in_addr external;
-  struct in_addr target;
-  uid_t uid;
-  unsigned int p;
-  int raw_eno;
-  int global_ret;
-
-  /* Create an ICMP raw socket for writing (only operation that requires root) */
-  rawsock = socket (AF_INET, SOCK_RAW, IPPROTO_RAW);
-  raw_eno = errno; /* for later error checking */
-
-  /* now drop root privileges */
-  uid = getuid ();
-#ifdef HAVE_SETRESUID
-  if (0 != setresuid (uid, uid, uid))
-  {
-    fprintf (stderr, "Failed to setresuid: %s\n", strerror (errno));
-    global_ret = 1;
-    goto cleanup;
-  }
-#else
-  if (0 != (setuid (uid) | seteuid (uid)))
-  {
-    fprintf (stderr, "Failed to setuid: %s\n", strerror (errno));
-    global_ret = 2;
-    goto cleanup;
-  }
-#endif
-  if (-1 == rawsock)
-  {
-    fprintf (stderr, "Error opening RAW socket: %s\n", strerror (raw_eno));
-    global_ret = 3;
-    goto cleanup;
-  }
-  if (0 !=
-      setsockopt (rawsock, SOL_SOCKET, SO_BROADCAST, (char *) &one,
-                  sizeof(one)))
-  {
-    fprintf (stderr, "setsockopt failed: %s\n", strerror (errno));
-    global_ret = 4;
-    goto cleanup;
-  }
-  if (0 !=
-      setsockopt (rawsock, IPPROTO_IP, IP_HDRINCL, (char *) &one, sizeof(one)))
-  {
-    fprintf (stderr, "setsockopt failed: %s\n", strerror (errno));
-    global_ret = 5;
-    goto cleanup;
-  }
-
-  if (4 != argc)
-  {
-    fprintf (stderr,
-             "This program must be started with our IP, the targets external IP, and our port as arguments.\n");
-    global_ret = 6;
-    goto cleanup;
-  }
-  if ((1 != inet_pton (AF_INET, argv[1], &external)) ||
-      (1 != inet_pton (AF_INET, argv[2], &target)))
-  {
-    fprintf (stderr, "Error parsing IPv4 address: %s\n", strerror (errno));
-    global_ret = 7;
-    goto cleanup;
-  }
-  if ((1 != sscanf (argv[3], "%u", &p)) || (0 == p) || (0xFFFF < p))
-  {
-    fprintf (stderr, "Error parsing port value `%s'\n", argv[3]);
-    global_ret = 8;
-    goto cleanup;
-  }
-  port = (uint16_t) p;
-  if (1 != inet_pton (AF_INET, DUMMY_IP, &dummy))
-  {
-    fprintf (stderr, "Internal error converting dummy IP to binary.\n");
-    global_ret = 9;
-    goto cleanup;
-  }
-  send_icmp (&external, &target);
-  send_icmp_udp (&external, &target);
-  global_ret = 0;
-cleanup:
-  if (-1 != rawsock)
-    (void) close (rawsock);
-  return global_ret;
-}
-
-
-/* end of gnunet-helper-nat-client.c */