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22 * @file nat/gnunet-service-nat.c
23 * @brief network address translation traversal service
24 * @author Christian Grothoff
26 * The purpose of this service is to enable transports to
27 * traverse NAT routers, by providing traversal options and
28 * knowledge about the local network topology.
31 * - migrate test cases to new NAT service
32 * - add new traceroute-based logic for external IP detection
34 * - implement & test STUN processing to classify NAT;
35 * basically, open port & try different methods.
39 #include "gnunet_util_lib.h"
40 #include "gnunet_protocols.h"
41 #include "gnunet_signatures.h"
42 #include "gnunet_statistics_service.h"
43 #include "gnunet_resolver_service.h"
44 #include "gnunet_nat_service.h"
45 #include "gnunet-service-nat.h"
46 #include "gnunet-service-nat_externalip.h"
47 #include "gnunet-service-nat_stun.h"
48 #include "gnunet-service-nat_mini.h"
49 #include "gnunet-service-nat_helper.h"
55 * How often should we ask the OS about a list of active
58 #define SCAN_FREQ GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 15)
61 * How long do we wait until we forcefully terminate autoconfiguration?
63 #define AUTOCONFIG_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
66 * How often do we scan for changes in how our external (dyndns) hostname resolves?
68 #define DYNDNS_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 7)
72 * Information we track per client address.
77 * Network address used by the client.
79 struct sockaddr_storage ss;
82 * Handle to active UPnP request where we asked upnpc to open
83 * a port at the NAT. NULL if we do not have such a request
86 struct GNUNET_NAT_MiniHandle *mh;
92 * List of local addresses this system has.
94 struct LocalAddressList
97 * This is a linked list.
99 struct LocalAddressList *next;
104 struct LocalAddressList *prev;
107 * Context for a gnunet-helper-nat-server used to listen
108 * for ICMP messages to this client for connection reversal.
110 struct HelperContext *hc;
113 * The address itself (i.e. `struct sockaddr_in` or `struct
114 * sockaddr_in6`, in the respective byte order).
116 struct sockaddr_storage addr;
119 * Address family. (FIXME: redundant, addr.ss_family! Remove!?)
124 * #GNUNET_YES if we saw this one in the previous iteration,
125 * but not in the current iteration and thus might need to
126 * remove it at the end.
131 * What type of address is this?
133 enum GNUNET_NAT_AddressClass ac;
139 * Internal data structure we track for each of our clients.
147 struct ClientHandle *next;
152 struct ClientHandle *prev;
155 * Underlying handle for this client with the service.
157 struct GNUNET_SERVICE_Client *client;
160 * Message queue for communicating with the client.
162 struct GNUNET_MQ_Handle *mq;
165 * Array of addresses used by the service.
167 struct ClientAddress *caddrs;
170 * External DNS name and port given by user due to manual
171 * hole punching. Special DNS name 'AUTO' is used to indicate
172 * desire for automatic determination of the external IP
173 * (instead of DNS or manual configuration, i.e. to be used
174 * if the IP keeps changing and we have no DynDNS, but we do
175 * have a hole punched).
180 * Name of the configuration section this client cares about.
185 * Task for periodically re-running the @e ext_dns DNS lookup.
187 struct GNUNET_SCHEDULER_Task *ext_dns_task;
190 * Handle for (DYN)DNS lookup of our external IP as given in
193 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
196 * Handle for monitoring external IP changes.
198 struct GN_ExternalIPMonitor *external_monitor;
201 * DLL of external IP addresses as given in @e hole_external.
203 struct LocalAddressList *ext_addr_head;
206 * DLL of external IP addresses as given in @e hole_external.
208 struct LocalAddressList *ext_addr_tail;
211 * Port number we found in @e hole_external.
213 uint16_t ext_dns_port;
216 * What does this client care about?
218 enum GNUNET_NAT_RegisterFlags flags;
221 * Is any of the @e caddrs in a reserved subnet for NAT?
226 * Number of addresses that this service is bound to.
227 * Length of the @e caddrs array.
232 * Client's IPPROTO, e.g. IPPROTO_UDP or IPPROTO_TCP.
240 * External IP address as given to us via some STUN server.
242 struct StunExternalIP
247 struct StunExternalIP *next;
252 struct StunExternalIP *prev;
255 * Task we run to remove this entry when it is stale.
257 struct GNUNET_SCHEDULER_Task *timeout_task;
260 * Our external IP address as reported by the
263 struct sockaddr_in external_addr;
266 * Address of the reporting STUN server. Used to
267 * detect when a STUN server changes its opinion
268 * to more quickly remove stale results.
270 struct sockaddr_storage stun_server_addr;
273 * Number of bytes used in @e stun_server_addr.
275 size_t stun_server_addr_len;
280 * Timeout to use when STUN data is considered stale.
282 static struct GNUNET_TIME_Relative stun_stale_timeout;
285 * How often do we scan for changes in how our external (dyndns) hostname resolves?
287 static struct GNUNET_TIME_Relative dyndns_frequency;
290 * Handle to our current configuration.
292 static const struct GNUNET_CONFIGURATION_Handle *cfg;
295 * Handle to the statistics service.
297 static struct GNUNET_STATISTICS_Handle *stats;
300 * Task scheduled to periodically scan our network interfaces.
302 static struct GNUNET_SCHEDULER_Task *scan_task;
305 * Head of client DLL.
307 static struct ClientHandle *ch_head;
310 * Tail of client DLL.
312 static struct ClientHandle *ch_tail;
315 * Head of DLL of local addresses.
317 static struct LocalAddressList *lal_head;
320 * Tail of DLL of local addresses.
322 static struct LocalAddressList *lal_tail;
327 static struct StunExternalIP *se_head;
332 static struct StunExternalIP *se_tail;
335 * Is UPnP enabled? #GNUNET_YES if enabled, #GNUNET_NO if disabled,
336 * #GNUNET_SYSERR if configuration enabled but binary is unavailable.
342 * Remove and free an entry from the #lal_head DLL.
344 * @param lal entry to free
347 free_lal (struct LocalAddressList *lal)
349 GNUNET_CONTAINER_DLL_remove (lal_head,
354 GNUNET_log (GNUNET_ERROR_TYPE_MESSAGE,
355 "Lost NATed local address %s, stopping NAT server\n",
356 GNUNET_a2s ((const struct sockaddr *) &lal->addr,
357 sizeof (struct sockaddr_in)));
359 GN_stop_gnunet_nat_server_ (lal->hc);
367 * Free the DLL starting at #lal_head.
372 struct LocalAddressList *lal;
374 while (NULL != (lal = lal_head))
380 * Check validity of #GNUNET_MESSAGE_TYPE_NAT_REGISTER message from
383 * @param cls client who sent the message
384 * @param message the message received
385 * @return #GNUNET_OK if message is well-formed
388 check_register (void *cls,
389 const struct GNUNET_NAT_RegisterMessage *message)
391 uint16_t num_addrs = ntohs (message->num_addrs);
392 const char *off = (const char *) &message[1];
393 size_t left = ntohs (message->header.size) - sizeof (*message);
395 for (unsigned int i=0;i<num_addrs;i++)
398 const struct sockaddr *sa = (const struct sockaddr *) off;
400 if (sizeof (sa_family_t) > left)
403 return GNUNET_SYSERR;
405 switch (sa->sa_family)
408 alen = sizeof (struct sockaddr_in);
411 alen = sizeof (struct sockaddr_in6);
415 alen = sizeof (struct sockaddr_un);
420 return GNUNET_SYSERR;
425 return GNUNET_SYSERR;
430 if (left != ntohs (message->str_len))
433 return GNUNET_SYSERR;
440 * Check if @a ip is in @a network with @a bits netmask.
442 * @param network to test
443 * @param ip IP address to test
444 * @param bits bitmask for the network
445 * @return #GNUNET_YES if @a ip is in @a network
448 match_ipv4 (const char *network,
449 const struct in_addr *ip,
458 GNUNET_assert (1 == inet_pton (AF_INET,
461 return ! ((ip->s_addr ^ net.s_addr) & htonl (0xFFFFFFFFu << (32 - bits)));
466 * Check if @a ip is in @a network with @a bits netmask.
468 * @param network to test
469 * @param ip IP address to test
470 * @param bits bitmask for the network
471 * @return #GNUNET_YES if @a ip is in @a network
474 match_ipv6 (const char *network,
475 const struct in6_addr *ip,
479 struct in6_addr mask;
484 GNUNET_assert (1 == inet_pton (AF_INET6,
487 memset (&mask, 0, sizeof (mask));
488 if (0 == memcmp (&mask,
495 mask.s6_addr[off++] = 0xFF;
500 mask.s6_addr[off] = (mask.s6_addr[off] >> 1) + 0x80;
503 for (unsigned j = 0; j < sizeof (struct in6_addr) / sizeof (uint32_t); j++)
504 if (((((uint32_t *) ip)[j] & ((uint32_t *) &mask)[j])) !=
505 (((uint32_t *) &net)[j] & ((int *) &mask)[j]))
512 * Test if the given IPv4 address is in a known range
513 * for private networks.
515 * @param ip address to test
516 * @return #GNUNET_YES if @a ip is in a NAT range
519 is_nat_v4 (const struct in_addr *ip)
522 match_ipv4 ("10.0.0.0", ip, 8) || /* RFC 1918 */
523 match_ipv4 ("100.64.0.0", ip, 10) || /* CG-NAT, RFC 6598 */
524 match_ipv4 ("192.168.0.0", ip, 12) || /* RFC 1918 */
525 match_ipv4 ("169.254.0.0", ip, 16) || /* AUTO, RFC 3927 */
526 match_ipv4 ("172.16.0.0", ip, 16); /* RFC 1918 */
531 * Test if the given IPv6 address is in a known range
532 * for private networks.
534 * @param ip address to test
535 * @return #GNUNET_YES if @a ip is in a NAT range
538 is_nat_v6 (const struct in6_addr *ip)
541 match_ipv6 ("fc00::", ip, 7) || /* RFC 4193 */
542 match_ipv6 ("fec0::", ip, 10) || /* RFC 3879 */
543 match_ipv6 ("fe80::", ip, 10); /* RFC 4291, link-local */
548 * Closure for #ifc_proc.
550 struct IfcProcContext
554 * Head of DLL of local addresses.
556 struct LocalAddressList *lal_head;
559 * Tail of DLL of local addresses.
561 struct LocalAddressList *lal_tail;
567 * Callback function invoked for each interface found. Adds them
568 * to our new address list.
570 * @param cls a `struct IfcProcContext *`
571 * @param name name of the interface (can be NULL for unknown)
572 * @param isDefault is this presumably the default interface
573 * @param addr address of this interface (can be NULL for unknown or unassigned)
574 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
575 * @param netmask the network mask (can be NULL for unknown or unassigned)
576 * @param addrlen length of the address
577 * @return #GNUNET_OK to continue iteration, #GNUNET_SYSERR to abort
583 const struct sockaddr *addr,
584 const struct sockaddr *broadcast_addr,
585 const struct sockaddr *netmask,
588 struct IfcProcContext *ifc_ctx = cls;
589 struct LocalAddressList *lal;
591 const struct in_addr *ip4;
592 const struct in6_addr *ip6;
593 enum GNUNET_NAT_AddressClass ac;
595 switch (addr->sa_family)
598 alen = sizeof (struct sockaddr_in);
599 ip4 = &((const struct sockaddr_in *) addr)->sin_addr;
600 if (match_ipv4 ("127.0.0.0", ip4, 8))
601 ac = GNUNET_NAT_AC_LOOPBACK;
602 else if (is_nat_v4 (ip4))
603 ac = GNUNET_NAT_AC_LAN;
605 ac = GNUNET_NAT_AC_GLOBAL;
608 alen = sizeof (struct sockaddr_in6);
609 ip6 = &((const struct sockaddr_in6 *) addr)->sin6_addr;
610 if (match_ipv6 ("::1", ip6, 128))
611 ac = GNUNET_NAT_AC_LOOPBACK;
612 else if (is_nat_v6 (ip6))
613 ac = GNUNET_NAT_AC_LAN;
615 ac = GNUNET_NAT_AC_GLOBAL;
616 if ( (ip6->s6_addr[11] == 0xFF) &&
617 (ip6->s6_addr[12] == 0xFE) )
619 /* contains a MAC, be extra careful! */
620 ac |= GNUNET_NAT_AC_PRIVATE;
632 lal = GNUNET_malloc (sizeof (*lal));
633 lal->af = addr->sa_family;
635 GNUNET_memcpy (&lal->addr,
638 GNUNET_CONTAINER_DLL_insert (ifc_ctx->lal_head,
646 * Notify client about a change in the list of addresses this peer
649 * @param ac address class of the entry in the list that changed
650 * @param ch client to contact
651 * @param add #GNUNET_YES to add, #GNUNET_NO to remove
652 * @param addr the address that changed
653 * @param addr_len number of bytes in @a addr
656 notify_client (enum GNUNET_NAT_AddressClass ac,
657 struct ClientHandle *ch,
662 struct GNUNET_MQ_Envelope *env;
663 struct GNUNET_NAT_AddressChangeNotificationMessage *msg;
665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
666 "Notifying client about %s of IP %s\n",
667 add ? "addition" : "removal",
670 env = GNUNET_MQ_msg_extra (msg,
672 GNUNET_MESSAGE_TYPE_NAT_ADDRESS_CHANGE);
673 msg->add_remove = htonl (add);
674 msg->addr_class = htonl (ac);
675 GNUNET_memcpy (&msg[1],
678 GNUNET_MQ_send (ch->mq,
684 * Check if we should bother to notify this client about this
685 * address change, and if so, do it.
687 * @param delta the entry in the list that changed
688 * @param ch client to check
689 * @param add #GNUNET_YES to add, #GNUNET_NO to remove
692 check_notify_client (struct LocalAddressList *delta,
693 struct ClientHandle *ch,
697 struct sockaddr_in v4;
698 struct sockaddr_in6 v6;
700 if (0 == (ch->flags & GNUNET_NAT_RF_ADDRESSES))
702 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
703 "Not notifying client as it does not care about addresses\n");
709 alen = sizeof (struct sockaddr_in);
714 /* Check for client notifications */
715 for (unsigned int i=0;i<ch->num_caddrs;i++)
717 const struct sockaddr_in *c4;
719 if (AF_INET != ch->caddrs[i].ss.ss_family)
720 continue; /* IPv4 not relevant */
721 c4 = (const struct sockaddr_in *) &ch->caddrs[i].ss;
722 if ( match_ipv4 ("127.0.0.1", &c4->sin_addr, 8) &&
723 (0 != c4->sin_addr.s_addr) &&
724 (! match_ipv4 ("127.0.0.1", &v4.sin_addr, 8)) )
725 continue; /* bound to loopback, but this is not loopback */
726 if ( (! match_ipv4 ("127.0.0.1", &c4->sin_addr, 8) ) &&
727 match_ipv4 ("127.0.0.1", &v4.sin_addr, 8) )
728 continue; /* bound to non-loopback, but this is loopback */
729 if ( (0 != (delta->ac & GNUNET_NAT_AC_EXTERN)) &&
730 (0 != c4->sin_addr.s_addr) &&
731 (! is_nat_v4 (&v4.sin_addr)) )
732 continue; /* based on external-IP, but this IP is not
733 from private address range. */
734 if ( (0 != memcmp (&v4.sin_addr,
736 sizeof (struct in_addr))) &&
737 (0 != c4->sin_addr.s_addr) &&
738 (! is_nat_v4 (&c4->sin_addr)) )
739 continue; /* this IP is not from private address range,
740 and IP does not match. */
742 /* OK, IP seems relevant, notify client */
743 if (0 == htons (v4.sin_port))
744 v4.sin_port = c4->sin_port;
745 notify_client (delta->ac,
753 alen = sizeof (struct sockaddr_in6);
757 for (unsigned int i=0;i<ch->num_caddrs;i++)
759 const struct sockaddr_in6 *c6;
761 if (AF_INET6 != ch->caddrs[i].ss.ss_family)
762 continue; /* IPv4 not relevant */
763 c6 = (const struct sockaddr_in6 *) &ch->caddrs[i].ss;
764 if ( match_ipv6 ("::1", &c6->sin6_addr, 128) &&
765 (0 != memcmp (&c6->sin6_addr,
767 sizeof (struct in6_addr))) &&
768 (! match_ipv6 ("::1", &v6.sin6_addr, 128)) )
769 continue; /* bound to loopback, but this is not loopback */
770 if ( (! match_ipv6 ("::1", &c6->sin6_addr, 128) ) &&
771 match_ipv6 ("::1", &v6.sin6_addr, 128) )
772 continue; /* bound to non-loopback, but this is loopback */
773 if ( (0 != (delta->ac & GNUNET_NAT_AC_EXTERN)) &&
774 (0 != memcmp (&c6->sin6_addr,
776 sizeof (struct in6_addr))) &&
777 (! is_nat_v6 (&v6.sin6_addr)) )
778 continue; /* based on external-IP, but this IP is not
779 from private address range. */
780 if ( (0 != memcmp (&v6.sin6_addr,
782 sizeof (struct in6_addr))) &&
783 (0 != memcmp (&c6->sin6_addr,
785 sizeof (struct in6_addr))) &&
786 (! is_nat_v6 (&c6->sin6_addr)) )
787 continue; /* this IP is not from private address range,
788 and IP does not match. */
789 if ( (match_ipv6 ("fe80::", &c6->sin6_addr, 10)) &&
790 (0 != memcmp (&c6->sin6_addr,
792 sizeof (struct in6_addr))) &&
793 (0 != memcmp (&v6.sin6_addr,
795 sizeof (struct in6_addr))) &&
796 (0 == (delta->ac & GNUNET_NAT_AC_EXTERN)) )
797 continue; /* client bound to link-local, and the other address
798 does not match and is not an external IP */
800 /* OK, IP seems relevant, notify client */
801 if (0 == htons (v6.sin6_port))
802 v6.sin6_port = c6->sin6_port;
803 notify_client (delta->ac,
818 * Notify all clients about a change in the list
819 * of addresses this peer has.
821 * @param delta the entry in the list that changed
822 * @param add #GNUNET_YES to add, #GNUNET_NO to remove
825 notify_clients (struct LocalAddressList *delta,
828 for (struct ClientHandle *ch = ch_head;
831 check_notify_client (delta,
838 * Tell relevant client about a change in our external
841 * @param cls client to check if it cares and possibly notify
842 * @param v4 the external address that changed
843 * @param add #GNUNET_YES to add, #GNUNET_NO to remove
846 notify_client_external_ipv4_change (void *cls,
847 const struct in_addr *v4,
850 struct ClientHandle *ch = cls;
851 struct sockaddr_in sa;
854 /* (0) check if this impacts 'hole_external' */
855 if ( (NULL != ch->hole_external) &&
856 (0 == strcasecmp (ch->hole_external,
859 struct LocalAddressList lal;
860 struct sockaddr_in *s4;
862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
863 "Detected eternal IP, can now back-fill AUTO:%u in hole punching specification of `%s'\n",
864 (unsigned int) ch->ext_dns_port,
866 memset (&lal, 0, sizeof (lal));
867 s4 = (struct sockaddr_in *) &lal.addr;
868 s4->sin_family = AF_INET;
869 s4->sin_port = htons (ch->ext_dns_port);
872 lal.ac = GNUNET_NAT_AC_GLOBAL | GNUNET_NAT_AC_MANUAL;
873 check_notify_client (&lal,
878 /* (1) check if client cares. */
879 if (! ch->natted_address)
882 for (unsigned int i=0;i<ch->num_caddrs;i++)
884 const struct sockaddr_storage *ss = &ch->caddrs[i].ss;
886 if (AF_INET != ss->ss_family)
888 have_v4 = GNUNET_YES;
891 if (GNUNET_NO == have_v4)
892 return; /* IPv6-only */
894 /* (2) build address info */
898 sa.sin_family = AF_INET;
900 sa.sin_port = htons (0);
902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
903 "Detected eternal IP %s, notifying client of external IP (without port)\n",
904 GNUNET_a2s ((const struct sockaddr *) &sa,
906 /* (3) notify client of change */
907 notify_client (is_nat_v4 (v4)
908 ? GNUNET_NAT_AC_EXTERN | GNUNET_NAT_AC_LAN
909 : GNUNET_NAT_AC_EXTERN | GNUNET_NAT_AC_GLOBAL,
918 * We got a connection reversal request from another peer.
919 * Notify applicable clients.
921 * @param cls closure with the `struct LocalAddressList`
922 * @param ra IP address of the peer who wants us to connect to it
925 reversal_callback (void *cls,
926 const struct sockaddr_in *ra)
928 struct LocalAddressList *lal = cls;
929 const struct sockaddr_in *l4;
931 GNUNET_assert (AF_INET == lal->af);
932 l4 = (const struct sockaddr_in *) &lal->addr;
933 for (struct ClientHandle *ch = ch_head;
937 struct GNUNET_NAT_ConnectionReversalRequestedMessage *crrm;
938 struct GNUNET_MQ_Envelope *env;
941 /* Check if client is in applicable range for ICMP NAT traversal
942 for this local address */
943 if (! ch->natted_address)
946 for (unsigned int i=0;i<ch->num_caddrs;i++)
948 struct ClientAddress *ca = &ch->caddrs[i];
949 const struct sockaddr_in *c4;
951 if (AF_INET != ca->ss.ss_family)
953 c4 = (const struct sockaddr_in *) &ca->ss;
954 if ( (0 != c4->sin_addr.s_addr) &&
955 (l4->sin_addr.s_addr != c4->sin_addr.s_addr) )
963 /* Notify applicable client about connection reversal request */
964 env = GNUNET_MQ_msg_extra (crrm,
965 sizeof (struct sockaddr_in),
966 GNUNET_MESSAGE_TYPE_NAT_CONNECTION_REVERSAL_REQUESTED);
967 GNUNET_memcpy (&crrm[1],
969 sizeof (struct sockaddr_in));
970 GNUNET_MQ_send (ch->mq,
977 * Task we run periodically to scan for network interfaces.
984 struct IfcProcContext ifc_ctx;
987 struct LocalAddressList *lnext;
989 scan_task = GNUNET_SCHEDULER_add_delayed (SCAN_FREQ,
995 GNUNET_OS_network_interfaces_list (&ifc_proc,
997 /* remove addresses that disappeared */
998 for (struct LocalAddressList *lal = lal_head;
1004 for (struct LocalAddressList *pos = ifc_ctx.lal_head;
1008 if ( (pos->af == lal->af) &&
1009 (0 == memcmp (&lal->addr,
1011 (AF_INET == lal->af)
1012 ? sizeof (struct sockaddr_in)
1013 : sizeof (struct sockaddr_in6))) )
1018 if (GNUNET_NO == found)
1020 notify_clients (lal,
1026 /* add addresses that appeared */
1027 have_nat = GNUNET_NO;
1028 for (struct LocalAddressList *pos = ifc_ctx.lal_head;
1030 pos = ifc_ctx.lal_head)
1033 if (GNUNET_NAT_AC_LAN == (GNUNET_NAT_AC_LAN & pos->ac))
1034 have_nat = GNUNET_YES;
1035 for (struct LocalAddressList *lal = lal_head;
1039 if ( (pos->af == lal->af) &&
1040 (0 == memcmp (&lal->addr,
1042 (AF_INET == lal->af)
1043 ? sizeof (struct sockaddr_in)
1044 : sizeof (struct sockaddr_in6))) )
1047 GNUNET_CONTAINER_DLL_remove (ifc_ctx.lal_head,
1050 if (GNUNET_YES == found)
1056 notify_clients (pos,
1058 GNUNET_CONTAINER_DLL_insert (lal_head,
1061 if ( (AF_INET == pos->af) &&
1062 (NULL == pos->hc) &&
1063 (0 != (GNUNET_NAT_AC_LAN & pos->ac)) )
1065 const struct sockaddr_in *s4
1066 = (const struct sockaddr_in *) &pos->addr;
1068 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1069 "Found NATed local address %s, starting NAT server\n",
1070 GNUNET_a2s ((const struct sockaddr *) &pos->addr,
1072 pos->hc = GN_start_gnunet_nat_server_ (&s4->sin_addr,
1078 GN_nat_status_changed (have_nat);
1083 * Function called whenever our set of external addresses
1084 * as created by `upnpc` changes.
1086 * @param cls closure with our `struct ClientHandle *`
1087 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
1088 * the previous (now invalid) one, #GNUNET_SYSERR indicates an error
1089 * @param addr either the previous or the new public IP address
1090 * @param addrlen actual length of the @a addr
1091 * @param result #GNUNET_NAT_ERROR_SUCCESS on success, otherwise the specific error code
1094 upnp_addr_change_cb (void *cls,
1096 const struct sockaddr *addr,
1098 enum GNUNET_NAT_StatusCode result)
1100 struct ClientHandle *ch = cls;
1101 enum GNUNET_NAT_AddressClass ac;
1105 case GNUNET_NAT_ERROR_SUCCESS:
1106 GNUNET_assert (NULL != addr);
1108 case GNUNET_NAT_ERROR_UPNPC_FAILED:
1109 case GNUNET_NAT_ERROR_UPNPC_TIMEOUT:
1110 case GNUNET_NAT_ERROR_IPC_FAILURE:
1111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1112 "Running upnpc failed: %d\n",
1115 case GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_NOT_FOUND:
1116 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1117 "external-ip binary not found\n");
1119 case GNUNET_NAT_ERROR_UPNPC_NOT_FOUND:
1120 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1121 "upnpc binary not found\n");
1123 case GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_FAILED:
1124 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1125 "external-ip binary could not be run\n");
1127 case GNUNET_NAT_ERROR_UPNPC_PORTMAP_FAILED:
1128 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1129 "upnpc failed to create port mapping\n");
1131 case GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_OUTPUT_INVALID:
1132 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1133 "Invalid output from upnpc\n");
1135 case GNUNET_NAT_ERROR_EXTERNAL_IP_ADDRESS_INVALID:
1136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1137 "Invalid address returned by upnpc\n");
1140 GNUNET_break (0); /* should not be possible */
1143 switch (addr->sa_family)
1146 ac = is_nat_v4 (&((const struct sockaddr_in *) addr)->sin_addr)
1148 : GNUNET_NAT_AC_EXTERN;
1151 ac = is_nat_v6 (&((const struct sockaddr_in6 *) addr)->sin6_addr)
1153 : GNUNET_NAT_AC_EXTERN;
1159 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1160 "upnp external address %s: %s\n",
1161 add_remove ? "added" : "removed",
1173 * Resolve the `hole_external` name to figure out our
1174 * external address from a manually punched hole. The
1175 * port number has already been parsed, this task is
1176 * responsible for periodically doing a DNS lookup.
1178 * @param ch client handle to act upon
1181 dyndns_lookup (void *cls);
1185 * Our (external) hostname was resolved. Update lists of
1186 * current external IPs (note that DNS may return multiple
1187 * addresses!) and notify client accordingly.
1189 * @param cls the `struct ClientHandle`
1190 * @param addr NULL on error, otherwise result of DNS lookup
1191 * @param addrlen number of bytes in @a addr
1194 process_external_ip (void *cls,
1195 const struct sockaddr *addr,
1198 struct ClientHandle *ch = cls;
1199 struct LocalAddressList *lal;
1200 struct sockaddr_storage ss;
1201 struct sockaddr_in *v4;
1202 struct sockaddr_in6 *v6;
1206 struct LocalAddressList *laln;
1210 = GNUNET_SCHEDULER_add_delayed (dyndns_frequency,
1213 /* Current iteration is over, remove 'old' IPs now */
1214 for (lal = ch->ext_addr_head; NULL != lal; lal = laln)
1217 if (GNUNET_YES == lal->old)
1219 GNUNET_CONTAINER_DLL_remove (ch->ext_addr_head,
1222 check_notify_client (lal,
1230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1231 "Got IP `%s' for external address `%s'\n",
1236 /* build sockaddr storage with port number */
1237 memset (&ss, 0, sizeof (ss));
1238 memcpy (&ss, addr, addrlen);
1239 switch (addr->sa_family)
1242 v4 = (struct sockaddr_in *) &ss;
1243 v4->sin_port = htons (ch->ext_dns_port);
1246 v6 = (struct sockaddr_in6 *) &ss;
1247 v6->sin6_port = htons (ch->ext_dns_port);
1253 /* See if 'ss' matches any of our known addresses */
1254 for (lal = ch->ext_addr_head; NULL != lal; lal = lal->next)
1256 if (GNUNET_NO == lal->old)
1257 continue; /* already processed, skip */
1258 if ( (addr->sa_family == lal->addr.ss_family) &&
1263 /* Address unchanged, remember so we do not remove */
1264 lal->old = GNUNET_NO;
1265 return; /* done here */
1268 /* notify client, and remember IP for later removal! */
1269 lal = GNUNET_new (struct LocalAddressList);
1271 lal->af = ss.ss_family;
1272 lal->ac = GNUNET_NAT_AC_GLOBAL | GNUNET_NAT_AC_MANUAL;
1273 GNUNET_CONTAINER_DLL_insert (ch->ext_addr_head,
1276 check_notify_client (lal,
1283 * Resolve the `hole_external` name to figure out our
1284 * external address from a manually punched hole. The
1285 * port number has already been parsed, this task is
1286 * responsible for periodically doing a DNS lookup.
1288 * @param ch client handle to act upon
1291 dyndns_lookup (void *cls)
1293 struct ClientHandle *ch = cls;
1294 struct LocalAddressList *lal;
1296 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1297 "Performing DNS lookup for punched hole given for `%s' as `%s:%u'\n",
1300 (unsigned int) ch->ext_dns_port);
1301 for (lal = ch->ext_addr_head; NULL != lal; lal = lal->next)
1302 lal->old = GNUNET_YES;
1303 ch->ext_dns_task = NULL;
1304 ch->ext_dns = GNUNET_RESOLVER_ip_get (ch->hole_external,
1306 GNUNET_TIME_UNIT_MINUTES,
1307 &process_external_ip,
1313 * Resolve the `hole_external` name to figure out our
1314 * external address from a manually punched hole. The
1315 * given name may be "AUTO" in which case we should use
1316 * the IP address(es) we have from upnpc or other methods.
1317 * The name can also be an IP address, in which case we
1318 * do not need to do DNS resolution. Finally, we also
1319 * need to parse the port number.
1321 * @param ch client handle to act upon
1324 lookup_hole_external (struct ClientHandle *ch)
1328 struct sockaddr_in *s4;
1329 struct LocalAddressList *lal;
1331 port = strrchr (ch->hole_external, ':');
1334 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1335 _("Malformed punched hole specification `%s' (lacks port)\n"),
1339 if ( (1 != sscanf (port + 1,
1344 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1345 _("Invalid port number in punched hole specification `%s' (lacks port)\n"),
1349 ch->ext_dns_port = (uint16_t) pnum;
1352 lal = GNUNET_new (struct LocalAddressList);
1353 if ('[' == *ch->hole_external)
1355 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *) &lal->addr;
1357 s6->sin6_family = AF_INET6;
1358 if (']' != (ch->hole_external[strlen(ch->hole_external)-1]))
1360 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1361 _("Malformed punched hole specification `%s' (lacks `]')\n"),
1366 ch->hole_external[strlen(ch->hole_external)-1] = '\0';
1367 if (1 != inet_pton (AF_INET6,
1368 ch->hole_external + 1,
1371 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1372 _("Malformed punched hole specification `%s' (IPv6 address invalid)"),
1373 ch->hole_external + 1);
1377 s6->sin6_port = htons (ch->ext_dns_port);
1379 lal->ac = GNUNET_NAT_AC_GLOBAL | GNUNET_NAT_AC_MANUAL;
1380 GNUNET_CONTAINER_DLL_insert (ch->ext_addr_head,
1383 check_notify_client (lal,
1389 s4 = (struct sockaddr_in *) &lal->addr;
1390 s4->sin_family = AF_INET;
1391 if (1 == inet_pton (AF_INET,
1395 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1396 "IPv4 punched hole given for `%s' via `%s:%u'\n",
1399 (unsigned int) ch->ext_dns_port);
1400 s4->sin_port = htons (ch->ext_dns_port);
1402 lal->ac = GNUNET_NAT_AC_GLOBAL | GNUNET_NAT_AC_MANUAL;
1403 GNUNET_CONTAINER_DLL_insert (ch->ext_addr_head,
1406 check_notify_client (lal,
1411 if (0 == strcasecmp (ch->hole_external,
1414 /* handled in #notify_client_external_ipv4_change() */
1418 /* got a DNS name, trigger lookup! */
1421 = GNUNET_SCHEDULER_add_now (&dyndns_lookup,
1427 * Handler for #GNUNET_MESSAGE_TYPE_NAT_REGISTER message from client.
1428 * We remember the client for updates upon future NAT events.
1430 * @param cls client who sent the message
1431 * @param message the message received
1434 handle_register (void *cls,
1435 const struct GNUNET_NAT_RegisterMessage *message)
1437 struct ClientHandle *ch = cls;
1441 if ( (0 != ch->proto) ||
1442 (NULL != ch->caddrs) )
1444 /* double registration not allowed */
1446 GNUNET_SERVICE_client_drop (ch->client);
1449 ch->flags = message->flags;
1450 ch->proto = message->proto;
1451 ch->num_caddrs = ntohs (message->num_addrs);
1452 ch->caddrs = GNUNET_new_array (ch->num_caddrs,
1453 struct ClientAddress);
1454 left = ntohs (message->header.size) - sizeof (*message);
1455 off = (const char *) &message[1];
1456 for (unsigned int i=0;i<ch->num_caddrs;i++)
1458 const struct sockaddr *sa = (const struct sockaddr *) off;
1463 if (sizeof (sa_family_t) > left)
1466 GNUNET_SERVICE_client_drop (ch->client);
1470 switch (sa->sa_family)
1474 struct sockaddr_in s4;
1478 sizeof (struct sockaddr_in));
1479 alen = sizeof (struct sockaddr_in);
1480 if (is_nat_v4 (&s4.sin_addr))
1481 is_nat = GNUNET_YES;
1482 port = ntohs (s4.sin_port);
1487 struct sockaddr_in6 s6;
1491 sizeof (struct sockaddr_in6));
1492 alen = sizeof (struct sockaddr_in6);
1493 if (is_nat_v6 (&s6.sin6_addr))
1494 is_nat = GNUNET_YES;
1495 port = ntohs (s6.sin6_port);
1500 alen = sizeof (struct sockaddr_un);
1506 GNUNET_SERVICE_client_drop (ch->client);
1510 GNUNET_assert (alen <= left);
1511 GNUNET_assert (alen <= sizeof (struct sockaddr_storage));
1512 GNUNET_memcpy (&ch->caddrs[i].ss,
1516 /* If applicable, try UPNPC NAT punching */
1519 ( (IPPROTO_TCP == ch->proto) ||
1520 (IPPROTO_UDP == ch->proto) ) )
1522 ch->natted_address = GNUNET_YES;
1524 = GNUNET_NAT_mini_map_start (port,
1525 IPPROTO_TCP == ch->proto,
1526 &upnp_addr_change_cb,
1534 = GNUNET_strndup (off,
1535 ntohs (message->str_len));
1536 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1537 "Received REGISTER message from client for subsystem `%s'\n",
1540 GNUNET_CONFIGURATION_get_value_string (cfg,
1543 &ch->hole_external))
1544 lookup_hole_external (ch);
1546 /* Actually send IP address list to client */
1547 for (struct LocalAddressList *lal = lal_head;
1551 check_notify_client (lal,
1555 /* Also consider IPv4 determined by `external-ip` */
1556 ch->external_monitor
1557 = GN_external_ipv4_monitor_start (¬ify_client_external_ipv4_change,
1559 GNUNET_SERVICE_client_continue (ch->client);
1564 * Check validity of #GNUNET_MESSAGE_TYPE_NAT_HANDLE_STUN message from
1567 * @param cls client who sent the message
1568 * @param message the message received
1569 * @return #GNUNET_OK if message is well-formed
1572 check_stun (void *cls,
1573 const struct GNUNET_NAT_HandleStunMessage *message)
1575 size_t sa_len = ntohs (message->sender_addr_size);
1576 size_t expect = sa_len + ntohs (message->payload_size);
1578 if (ntohs (message->header.size) - sizeof (*message) != expect)
1581 return GNUNET_SYSERR;
1583 if (sa_len < sizeof (sa_family_t))
1586 return GNUNET_SYSERR;
1593 * Notify all clients about our external IP address
1594 * as reported by the STUN server.
1596 * @param ip the external IP
1597 * @param add #GNUNET_YES to add, #GNUNET_NO to remove
1600 notify_clients_stun_change (const struct sockaddr_in *ip,
1603 for (struct ClientHandle *ch = ch_head;
1607 struct sockaddr_in v4;
1608 struct GNUNET_NAT_AddressChangeNotificationMessage *msg;
1609 struct GNUNET_MQ_Envelope *env;
1611 if (! ch->natted_address)
1614 v4.sin_port = htons (0);
1615 env = GNUNET_MQ_msg_extra (msg,
1617 GNUNET_MESSAGE_TYPE_NAT_ADDRESS_CHANGE);
1618 msg->add_remove = htonl ((int32_t) add);
1619 msg->addr_class = htonl (GNUNET_NAT_AC_EXTERN |
1620 GNUNET_NAT_AC_GLOBAL);
1621 GNUNET_memcpy (&msg[1],
1624 GNUNET_MQ_send (ch->mq,
1631 * Function to be called when we decide that an
1632 * external IP address as told to us by a STUN
1633 * server has gone stale.
1635 * @param cls the `struct StunExternalIP` to drop
1638 stun_ip_timeout (void *cls)
1640 struct StunExternalIP *se = cls;
1642 se->timeout_task = NULL;
1643 notify_clients_stun_change (&se->external_addr,
1645 GNUNET_CONTAINER_DLL_remove (se_head,
1653 * Handler for #GNUNET_MESSAGE_TYPE_NAT_HANDLE_STUN message from
1656 * @param cls client who sent the message
1657 * @param message the message received
1660 handle_stun (void *cls,
1661 const struct GNUNET_NAT_HandleStunMessage *message)
1663 struct ClientHandle *ch = cls;
1664 const char *buf = (const char *) &message[1];
1665 const struct sockaddr *sa;
1666 const void *payload;
1668 size_t payload_size;
1669 struct sockaddr_in external_addr;
1671 sa_len = ntohs (message->sender_addr_size);
1672 payload_size = ntohs (message->payload_size);
1673 sa = (const struct sockaddr *) &buf[0];
1674 payload = (const struct sockaddr *) &buf[sa_len];
1675 switch (sa->sa_family)
1678 if (sa_len != sizeof (struct sockaddr_in))
1681 GNUNET_SERVICE_client_drop (ch->client);
1686 if (sa_len != sizeof (struct sockaddr_in6))
1689 GNUNET_SERVICE_client_drop (ch->client);
1694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1695 "Received HANDLE_STUN message from client\n");
1697 GNUNET_NAT_stun_handle_packet_ (payload,
1701 /* We now know that a server at "sa" claims that
1702 we are visible at IP "external_addr".
1704 We should (for some fixed period of time) tell
1705 all of our clients that listen to a NAT'ed address
1706 that they might want to consider the given 'external_ip'
1707 as their public IP address (this includes TCP and UDP
1708 clients, even if only UDP sends STUN requests).
1710 If we do not get a renewal, the "external_addr" should be
1711 removed again. The timeout frequency should be configurable
1712 (with a sane default), so that the UDP plugin can tell how
1713 often to re-request STUN.
1715 struct StunExternalIP *se;
1717 /* Check if we had a prior response from this STUN server */
1718 for (se = se_head; NULL != se; se = se->next)
1720 if ( (se->stun_server_addr_len != sa_len) ||
1722 &se->stun_server_addr,
1724 continue; /* different STUN server */
1725 if (0 != memcmp (&external_addr,
1727 sizeof (struct sockaddr_in)))
1729 /* external IP changed, update! */
1730 notify_clients_stun_change (&se->external_addr,
1732 se->external_addr = external_addr;
1733 notify_clients_stun_change (&se->external_addr,
1736 /* update timeout */
1737 GNUNET_SCHEDULER_cancel (se->timeout_task);
1739 = GNUNET_SCHEDULER_add_delayed (stun_stale_timeout,
1744 /* STUN server is completely new, create fresh entry */
1745 se = GNUNET_new (struct StunExternalIP);
1746 se->external_addr = external_addr;
1747 GNUNET_memcpy (&se->stun_server_addr,
1750 se->stun_server_addr_len = sa_len;
1751 se->timeout_task = GNUNET_SCHEDULER_add_delayed (stun_stale_timeout,
1754 GNUNET_CONTAINER_DLL_insert (se_head,
1757 notify_clients_stun_change (&se->external_addr,
1760 GNUNET_SERVICE_client_continue (ch->client);
1766 * #GNUNET_MESSAGE_TYPE_NAT_REQUEST_CONNECTION_REVERSAL message from
1769 * @param cls client who sent the message
1770 * @param message the message received
1771 * @return #GNUNET_OK if message is well-formed
1774 check_request_connection_reversal (void *cls,
1775 const struct GNUNET_NAT_RequestConnectionReversalMessage *message)
1779 expect = ntohs (message->local_addr_size)
1780 + ntohs (message->remote_addr_size);
1781 if (ntohs (message->header.size) - sizeof (*message) != expect)
1784 return GNUNET_SYSERR;
1791 * Handler for #GNUNET_MESSAGE_TYPE_NAT_REQUEST_CONNECTION_REVERSAL
1792 * message from client.
1794 * @param cls client who sent the message
1795 * @param message the message received
1798 handle_request_connection_reversal (void *cls,
1799 const struct GNUNET_NAT_RequestConnectionReversalMessage *message)
1801 struct ClientHandle *ch = cls;
1802 const char *buf = (const char *) &message[1];
1803 size_t local_sa_len = ntohs (message->local_addr_size);
1804 size_t remote_sa_len = ntohs (message->remote_addr_size);
1805 struct sockaddr_in l4;
1806 struct sockaddr_in r4;
1809 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1810 "Received REQUEST CONNECTION REVERSAL message from client\n");
1811 if (local_sa_len != sizeof (struct sockaddr_in))
1813 GNUNET_break_op (0);
1814 GNUNET_SERVICE_client_drop (ch->client);
1817 if (remote_sa_len != sizeof (struct sockaddr_in))
1819 GNUNET_break_op (0);
1820 GNUNET_SERVICE_client_drop (ch->client);
1825 sizeof (struct sockaddr_in));
1826 GNUNET_break_op (AF_INET == l4.sin_family);
1827 buf += sizeof (struct sockaddr_in);
1830 sizeof (struct sockaddr_in));
1831 GNUNET_break_op (AF_INET == r4.sin_family);
1832 ret = GN_request_connection_reversal (&l4.sin_addr,
1833 ntohs (l4.sin_port),
1835 if (GNUNET_OK != ret)
1836 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1837 _("Connection reversal request failed\n"));
1838 GNUNET_SERVICE_client_continue (ch->client);
1843 * Task run during shutdown.
1848 shutdown_task (void *cls)
1850 struct StunExternalIP *se;
1852 while (NULL != (se = se_head))
1854 GNUNET_CONTAINER_DLL_remove (se_head,
1857 GNUNET_SCHEDULER_cancel (se->timeout_task);
1860 GN_nat_status_changed (GNUNET_NO);
1861 if (NULL != scan_task)
1863 GNUNET_SCHEDULER_cancel (scan_task);
1868 GNUNET_STATISTICS_destroy (stats,
1877 * Setup NAT service.
1879 * @param cls closure
1880 * @param c configuration to use
1881 * @param service the initialized service
1885 const struct GNUNET_CONFIGURATION_Handle *c,
1886 struct GNUNET_SERVICE_Handle *service)
1890 GNUNET_CONFIGURATION_get_value_time (cfg,
1893 &stun_stale_timeout))
1894 stun_stale_timeout = GNUNET_TIME_UNIT_HOURS;
1896 /* Check for UPnP */
1898 = GNUNET_CONFIGURATION_get_value_yesno (cfg,
1901 if (GNUNET_YES == enable_upnp)
1903 /* check if it works */
1904 if (GNUNET_SYSERR ==
1905 GNUNET_OS_check_helper_binary ("upnpc",
1909 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1910 _("UPnP enabled in configuration, but UPnP client `upnpc` command not found, disabling UPnP\n"));
1911 enable_upnp = GNUNET_SYSERR;
1915 GNUNET_CONFIGURATION_get_value_time (cfg,
1919 dyndns_frequency = DYNDNS_FREQUENCY;
1921 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
1923 stats = GNUNET_STATISTICS_create ("nat",
1925 scan_task = GNUNET_SCHEDULER_add_now (&run_scan,
1931 * Callback called when a client connects to the service.
1933 * @param cls closure for the service
1934 * @param c the new client that connected to the service
1935 * @param mq the message queue used to send messages to the client
1936 * @return a `struct ClientHandle`
1939 client_connect_cb (void *cls,
1940 struct GNUNET_SERVICE_Client *c,
1941 struct GNUNET_MQ_Handle *mq)
1943 struct ClientHandle *ch;
1945 ch = GNUNET_new (struct ClientHandle);
1948 GNUNET_CONTAINER_DLL_insert (ch_head,
1956 * Callback called when a client disconnected from the service
1958 * @param cls closure for the service
1959 * @param c the client that disconnected
1960 * @param internal_cls a `struct ClientHandle *`
1963 client_disconnect_cb (void *cls,
1964 struct GNUNET_SERVICE_Client *c,
1967 struct ClientHandle *ch = internal_cls;
1968 struct LocalAddressList *lal;
1970 GNUNET_CONTAINER_DLL_remove (ch_head,
1973 for (unsigned int i=0;i<ch->num_caddrs;i++)
1975 if (NULL != ch->caddrs[i].mh)
1977 GNUNET_NAT_mini_map_stop (ch->caddrs[i].mh);
1978 ch->caddrs[i].mh = NULL;
1981 GNUNET_free_non_null (ch->caddrs);
1982 while (NULL != (lal = ch->ext_addr_head))
1984 GNUNET_CONTAINER_DLL_remove (ch->ext_addr_head,
1989 if (NULL != ch->ext_dns_task)
1991 GNUNET_SCHEDULER_cancel (ch->ext_dns_task);
1992 ch->ext_dns_task = NULL;
1994 if (NULL != ch->external_monitor)
1996 GN_external_ipv4_monitor_stop (ch->external_monitor);
1997 ch->external_monitor = NULL;
1999 if (NULL != ch->ext_dns)
2001 GNUNET_RESOLVER_request_cancel (ch->ext_dns);
2004 GNUNET_free_non_null (ch->hole_external);
2005 GNUNET_free_non_null (ch->section_name);
2011 * Define "main" method using service macro.
2015 GNUNET_SERVICE_OPTION_NONE,
2018 &client_disconnect_cb,
2020 GNUNET_MQ_hd_var_size (register,
2021 GNUNET_MESSAGE_TYPE_NAT_REGISTER,
2022 struct GNUNET_NAT_RegisterMessage,
2024 GNUNET_MQ_hd_var_size (stun,
2025 GNUNET_MESSAGE_TYPE_NAT_HANDLE_STUN,
2026 struct GNUNET_NAT_HandleStunMessage,
2028 GNUNET_MQ_hd_var_size (request_connection_reversal,
2029 GNUNET_MESSAGE_TYPE_NAT_REQUEST_CONNECTION_REVERSAL,
2030 struct GNUNET_NAT_RequestConnectionReversalMessage,
2032 GNUNET_MQ_handler_end ());
2035 #if defined(LINUX) && defined(__GLIBC__)
2039 * MINIMIZE heap size (way below 128k) since this process doesn't need much.
2041 void __attribute__ ((constructor))
2042 GNUNET_ARM_memory_init ()
2044 mallopt (M_TRIM_THRESHOLD, 4 * 1024);
2045 mallopt (M_TOP_PAD, 1 * 1024);
2050 /* end of gnunet-service-nat.c */