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23 * @brief Library handling UPnP and NAT-PMP port forwarding and
24 * external IP address retrieval
25 * @author Milan Bouchet-Valat
26 * @author Christian Grothoff
29 #include "gnunet_util_lib.h"
30 #include "gnunet_resolver_service.h"
31 #include "gnunet_nat_lib.h"
34 #define LOG(kind,...) GNUNET_log_from (kind, "nat", __VA_ARGS__)
37 * How often do we scan for changes in our IP address from our local
40 #define IFC_SCAN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 15)
43 * How often do we scan for changes in how our hostname resolves?
45 #define HOSTNAME_DNS_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 20)
49 * How often do we scan for changes in how our external (dyndns) hostname resolves?
51 #define DYNDNS_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 7)
54 * How long until we give up trying to resolve our own hostname?
56 #define HOSTNAME_RESOLVE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
60 * How often do we check a STUN server ?
62 #define STUN_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 2)
66 * Where did the given local address originate from?
67 * To be used for debugging as well as in the future
68 * to remove all addresses from a certain source when
69 * we reevaluate the source.
71 enum LocalAddressSource
74 * Address was obtained by DNS resolution of the external hostname
75 * given in the configuration (i.e. hole-punched DynDNS setup).
80 * Address was obtained by an external STUN server
85 * Address was obtained by DNS resolution of the external hostname
86 * given in the configuration (i.e. hole-punched DynDNS setup)
87 * during the previous iteration (see #3213).
92 * Address was obtained by looking up our own hostname in DNS.
97 * Address was obtained by scanning our hosts's network interfaces
98 * and taking their address (no DNS involved).
100 LAL_INTERFACE_ADDRESS,
103 * Addresses we were explicitly bound to.
108 * Addresses from UPnP or PMP
120 * List of local addresses that we currently deem valid. Actual
121 * struct is followed by the 'struct sockaddr'. Note that the code
122 * intentionally makes no attempt to ensure that a particular address
123 * is only listed once (especially since it may come from different
124 * sources, and the source is an "internal" construct).
126 struct LocalAddressList
129 * This is a linked list.
131 struct LocalAddressList *next;
136 struct LocalAddressList *prev;
139 * Number of bytes of address that follow.
144 * Origin of the local address.
146 enum LocalAddressSource source;
151 * Handle for miniupnp-based NAT traversal actions.
157 * Doubly-linked list.
159 struct MiniList *next;
162 * Doubly-linked list.
164 struct MiniList *prev;
167 * Handle to mini-action.
169 struct GNUNET_NAT_MiniHandle *mini;
172 * Local port number that was mapped.
180 * List of STUN servers
182 struct StunServerList
186 * Doubly-linked list.
188 struct StunServerList *next;
191 * Doubly-linked list.
193 struct StunServerList *prev;
209 * Handle for active NAT registrations.
211 struct GNUNET_NAT_Handle
215 * Configuration to use.
217 const struct GNUNET_CONFIGURATION_Handle *cfg;
220 * Function to call when we learn about a new address.
222 GNUNET_NAT_AddressCallback address_callback;
225 * Function to call when we notice another peer asking for
226 * connection reversal.
228 GNUNET_NAT_ReversalCallback reversal_callback;
231 * Closure for callbacks (@e address_callback and @e reversal_callback)
236 * Handle for (DYN)DNS lookup of our external IP.
238 struct GNUNET_RESOLVER_RequestHandle *ext_dns;
241 * Handle for request of hostname resolution, non-NULL if pending.
243 struct GNUNET_RESOLVER_RequestHandle *hostname_dns;
246 * stdout pipe handle for the gnunet-helper-nat-server process
248 struct GNUNET_DISK_PipeHandle *server_stdout;
251 * stdout file handle (for reading) for the gnunet-helper-nat-server process
253 const struct GNUNET_DISK_FileHandle *server_stdout_handle;
256 * Linked list of currently valid addresses (head).
258 struct LocalAddressList *lal_head;
261 * Linked list of currently valid addresses (tail).
263 struct LocalAddressList *lal_tail;
266 * How long do we wait for restarting a crashed gnunet-helper-nat-server?
268 struct GNUNET_TIME_Relative server_retry_delay;
271 * ID of select gnunet-helper-nat-server stdout read task
273 struct GNUNET_SCHEDULER_Task *server_read_task;
276 * ID of interface IP-scan task
278 struct GNUNET_SCHEDULER_Task *ifc_task;
281 * ID of hostname DNS lookup task
283 struct GNUNET_SCHEDULER_Task *hostname_task;
286 * ID of DynDNS lookup task
288 struct GNUNET_SCHEDULER_Task *dns_task;
291 * Active STUN request, if any.
293 struct GNUNET_NAT_STUN_Handle *stun_request;
296 * How often do we scan for changes in our IP address from our local
299 struct GNUNET_TIME_Relative ifc_scan_frequency;
302 * How often do we scan for changes in how our hostname resolves?
304 struct GNUNET_TIME_Relative hostname_dns_frequency;
307 * How often do we scan for changes in how our external (dyndns) hostname resolves?
309 struct GNUNET_TIME_Relative dyndns_frequency;
312 * The process id of the server process (if behind NAT)
314 struct GNUNET_OS_Process *server_proc;
317 * LAN address as passed by the caller (array).
319 struct sockaddr **local_addrs;
322 * Length of the @e local_addrs.
324 socklen_t *local_addrlens;
327 * List of handles for UPnP-traversal, one per local port (if
330 struct MiniList *mini_head;
333 * List of handles for UPnP-traversal, one per local port (if
336 struct MiniList *mini_tail;
339 * Number of entries in 'local_addrs' array.
341 unsigned int num_local_addrs;
344 * Our external address (according to config, UPnP may disagree...),
345 * in dotted decimal notation, IPv4-only. Or NULL if not known.
347 char *external_address;
350 * Presumably our internal address (according to config)
352 char *internal_address;
355 * Is this transport configured to be behind a NAT?
360 * Has the NAT been punched? (according to config)
365 * Is this transport configured to allow connections to NAT'd peers?
367 int enable_nat_client;
370 * Should we run the gnunet-helper-nat-server?
372 int enable_nat_server;
375 * Are we allowed to try UPnP/PMP for NAT traversal?
380 * Should we use local addresses (loopback)? (according to config)
382 int use_localaddresses;
385 * Should we return local addresses to clients
387 int return_localaddress;
390 * Should we do a DNS lookup of our hostname to find out our own IP?
395 * Is using IPv6 disabled?
400 * Is this TCP or UDP?
405 * Port we advertise to the outside.
410 * Should we use STUN ?
415 * How often should we check STUN ?
417 struct GNUNET_TIME_Relative stun_frequency;
422 struct GNUNET_NETWORK_Handle* socket;
425 * Am I waiting for a STUN response ?
432 struct GNUNET_SCHEDULER_Task *stun_task;
435 * Head of List of STUN servers
437 struct StunServerList *stun_servers_head;
440 * Tail of List of STUN servers
442 struct StunServerList *stun_servers_tail;
447 struct StunServerList *actual_stun_server;
453 * Try to start the gnunet-helper-nat-server (if it is not
456 * @param h handle to NAT
459 start_gnunet_nat_server (struct GNUNET_NAT_Handle *h);
463 * Remove all addresses from the list of 'local' addresses
464 * that originated from the given source.
466 * @param h handle to NAT
467 * @param src source that identifies addresses to remove
470 remove_from_address_list_by_source (struct GNUNET_NAT_Handle *h,
471 enum LocalAddressSource src)
473 struct LocalAddressList *pos;
474 struct LocalAddressList *next;
477 while (NULL != (pos = next))
480 if (pos->source != src)
482 GNUNET_CONTAINER_DLL_remove (h->lal_head,
485 if (NULL != h->address_callback)
486 h->address_callback (h->callback_cls,
488 (const struct sockaddr *) &pos[1],
496 * Add the given address to the list of 'local' addresses, thereby
497 * making it a 'legal' address for this peer to have.
499 * @param h handle to NAT
500 * @param src where did the local address originate from?
501 * @param arg the address, some `struct sockaddr`
502 * @param arg_size number of bytes in @a arg
505 add_to_address_list_as_is (struct GNUNET_NAT_Handle *h,
506 enum LocalAddressSource src,
507 const struct sockaddr *arg,
510 struct LocalAddressList *lal;
512 lal = GNUNET_malloc (sizeof (struct LocalAddressList) + arg_size);
513 GNUNET_memcpy (&lal[1], arg, arg_size);
514 lal->addrlen = arg_size;
516 GNUNET_CONTAINER_DLL_insert (h->lal_head,
519 LOG (GNUNET_ERROR_TYPE_DEBUG,
520 "Adding address `%s' from source %d\n",
521 GNUNET_a2s (arg, arg_size),
523 if (NULL != h->address_callback)
524 h->address_callback (h->callback_cls,
532 * Add the given address to the list of 'local' addresses, thereby
533 * making it a 'legal' address for this peer to have. Set the
534 * port number in the process to the advertised port and possibly
535 * also to zero (if we have the gnunet-helper-nat-server).
537 * @param h handle to NAT
538 * @param src where did the local address originate from?
539 * @param arg the address, some `struct sockaddr`
540 * @param arg_size number of bytes in @a arg
543 add_to_address_list (struct GNUNET_NAT_Handle *h,
544 enum LocalAddressSource src,
545 const struct sockaddr *arg,
548 struct sockaddr_in s4;
549 const struct sockaddr_in *in4;
550 struct sockaddr_in6 s6;
551 const struct sockaddr_in6 *in6;
553 if (arg_size == sizeof (struct sockaddr_in))
555 in4 = (const struct sockaddr_in *) arg;
557 s4.sin_port = htons (h->adv_port);
558 add_to_address_list_as_is (h, src, (const struct sockaddr *) &s4,
559 sizeof (struct sockaddr_in));
560 if (GNUNET_YES == h->enable_nat_server)
562 /* also add with PORT = 0 to indicate NAT server is enabled */
563 s4.sin_port = htons (0);
564 add_to_address_list_as_is (h, src, (const struct sockaddr *) &s4,
565 sizeof (struct sockaddr_in));
568 else if (arg_size == sizeof (struct sockaddr_in6))
570 if (GNUNET_YES != h->disable_ipv6)
572 in6 = (const struct sockaddr_in6 *) arg;
574 s6.sin6_port = htons (h->adv_port);
575 add_to_address_list_as_is (h, src, (const struct sockaddr *) &s6,
576 sizeof (struct sockaddr_in6));
587 * Add the given IP address to the list of 'local' addresses, thereby
588 * making it a 'legal' address for this peer to have.
590 * @param h handle to NAT
591 * @param src where did the local address originate from?
592 * @param addr the address, some `struct in_addr` or `struct in6_addr`
593 * @param addrlen number of bytes in addr
596 add_ip_to_address_list (struct GNUNET_NAT_Handle *h,
597 enum LocalAddressSource src,
601 struct sockaddr_in s4;
602 const struct in_addr *in4;
603 struct sockaddr_in6 s6;
604 const struct in6_addr *in6;
606 if (addrlen == sizeof (struct in_addr))
608 in4 = (const struct in_addr *) addr;
609 memset (&s4, 0, sizeof (s4));
610 s4.sin_family = AF_INET;
612 #if HAVE_SOCKADDR_IN_SIN_LEN
613 s4.sin_len = (u_char) sizeof (struct sockaddr_in);
616 add_to_address_list (h, src, (const struct sockaddr *) &s4,
617 sizeof (struct sockaddr_in));
618 if (GNUNET_YES == h->enable_nat_server)
620 /* also add with PORT = 0 to indicate NAT server is enabled */
621 s4.sin_port = htons (0);
622 add_to_address_list (h, src, (const struct sockaddr *) &s4,
623 sizeof (struct sockaddr_in));
627 else if (addrlen == sizeof (struct in6_addr))
629 if (GNUNET_YES != h->disable_ipv6)
631 in6 = (const struct in6_addr *) addr;
632 memset (&s6, 0, sizeof (s6));
633 s6.sin6_family = AF_INET6;
634 s6.sin6_port = htons (h->adv_port);
635 #if HAVE_SOCKADDR_IN_SIN_LEN
636 s6.sin6_len = (u_char) sizeof (struct sockaddr_in6);
639 add_to_address_list (h, src, (const struct sockaddr *) &s6,
640 sizeof (struct sockaddr_in6));
651 * Task to do DNS lookup on our external hostname to
652 * get DynDNS-IP addresses.
654 * @param cls the NAT handle
657 resolve_dns (void *cls);
661 * Our (external) hostname was resolved and the configuration says that
662 * the NAT was hole-punched.
664 * @param cls the `struct GNUNET_NAT_Handle`
665 * @param addr NULL on error, otherwise result of DNS lookup
666 * @param addrlen number of bytes in @a addr
669 process_external_ip (void *cls,
670 const struct sockaddr *addr,
673 struct GNUNET_NAT_Handle *h = cls;
674 struct in_addr dummy;
679 /* Current iteration is over, remove 'old' IPs now */
680 LOG (GNUNET_ERROR_TYPE_DEBUG,
681 "Purging old IPs for external address\n");
682 remove_from_address_list_by_source (h,
683 LAL_EXTERNAL_IP_OLD);
684 if (1 == inet_pton (AF_INET,
688 LOG (GNUNET_ERROR_TYPE_DEBUG,
689 "Got numeric IP for external address, not repeating lookup\n");
690 return; /* repated lookup pointless: was numeric! */
693 GNUNET_SCHEDULER_add_delayed (h->dyndns_frequency,
697 LOG (GNUNET_ERROR_TYPE_DEBUG,
698 "Got IP `%s' for external address `%s'\n",
701 h->external_address);
702 add_to_address_list (h,
710 * Task to do a lookup on our hostname for IP addresses.
712 * @param cls the NAT handle
715 resolve_hostname (void *cls);
719 * Function called by the resolver for each address obtained from DNS
720 * for our own hostname. Add the addresses to the list of our IP
724 * @param addr one of the addresses of the host, NULL for the last address
725 * @param addrlen length of the @a addr
728 process_hostname_ip (void *cls,
729 const struct sockaddr *addr,
732 struct GNUNET_NAT_Handle *h = cls;
736 h->hostname_dns = NULL;
738 GNUNET_SCHEDULER_add_delayed (h->hostname_dns_frequency,
743 add_to_address_list (h,
751 * Length of the interface names returned from os_network.c.
752 * (in that file, hardcoded at 11).
754 #define IF_NAME_LEN 11
758 * Add the IP of our network interface to the list of
761 * @param cls the `struct GNUNET_NAT_Handle`
762 * @param name name of the interface
763 * @param isDefault do we think this may be our default interface
764 * @param addr address of the interface
765 * @param broadcast_addr the broadcast address (can be NULL for unknown or unassigned)
766 * @param netmask the network mask (can be NULL for unknown or unassigned))
767 * @param addrlen number of bytes in @a addr and @a broadcast_addr
768 * @return #GNUNET_OK to continue iterating
771 process_interfaces (void *cls,
774 const struct sockaddr *addr,
775 const struct sockaddr *broadcast_addr,
776 const struct sockaddr *netmask,
779 const static struct in6_addr any6 = IN6ADDR_ANY_INIT;
780 struct GNUNET_NAT_Handle *h = cls;
781 const struct sockaddr_in *s4;
782 const struct sockaddr_in6 *s6;
784 char buf[INET6_ADDRSTRLEN];
789 /* skip virtual interfaces created by GNUnet-vpn */
791 GNUNET_CONFIGURATION_get_value_string (h->cfg,
796 if (0 == strncasecmp (name,
800 GNUNET_free (tun_if);
803 GNUNET_free (tun_if);
805 /* skip virtual interfaces created by GNUnet-dns */
807 GNUNET_CONFIGURATION_get_value_string (h->cfg,
812 if (0 == strncasecmp (name,
816 GNUNET_free (tun_if);
819 GNUNET_free (tun_if);
821 /* skip virtual interfaces created by GNUnet-exit */
823 GNUNET_CONFIGURATION_get_value_string (h->cfg,
828 if (0 == strncasecmp (name,
832 GNUNET_free (tun_if);
835 GNUNET_free (tun_if);
838 switch (addr->sa_family)
841 /* check if we're bound to the "ANY" IP address */
842 have_any = GNUNET_NO;
843 for (i=0;i<h->num_local_addrs;i++)
845 if (h->local_addrs[i]->sa_family != AF_INET)
850 if (INADDR_ANY == ((struct sockaddr_in*) h->local_addrs[i])->sin_addr.s_addr)
852 have_any = GNUNET_YES;
856 if (GNUNET_NO == have_any)
857 return GNUNET_OK; /* not bound to IP 0.0.0.0 but to specific IP addresses,
858 do not use those from interfaces */
859 s4 = (struct sockaddr_in *) addr;
862 /* Check if address is in 127.0.0.0/8 */
863 uint32_t address = ntohl ((uint32_t) (s4->sin_addr.s_addr));
864 uint32_t value = (address & 0xFF000000) ^ 0x7F000000;
866 if ((h->return_localaddress == GNUNET_NO) && (value == 0))
870 if ((GNUNET_YES == h->use_localaddresses) || (value != 0))
872 add_ip_to_address_list (h, LAL_INTERFACE_ADDRESS, &s4->sin_addr,
873 sizeof (struct in_addr));
877 /* check if we're bound to the "ANY" IP address */
878 have_any = GNUNET_NO;
879 for (i=0;i<h->num_local_addrs;i++)
881 if (h->local_addrs[i]->sa_family != AF_INET6)
883 if (0 == memcmp (&any6,
884 &((struct sockaddr_in6*) h->local_addrs[i])->sin6_addr,
885 sizeof (struct in6_addr)))
887 have_any = GNUNET_YES;
891 if (GNUNET_NO == have_any)
892 return GNUNET_OK; /* not bound to "ANY" IP (::0) but to specific IP addresses,
893 do not use those from interfaces */
895 s6 = (struct sockaddr_in6 *) addr;
896 if (IN6_IS_ADDR_LINKLOCAL (&((struct sockaddr_in6 *) addr)->sin6_addr))
898 /* skip link local addresses */
901 if ((h->return_localaddress == GNUNET_NO) &&
902 (IN6_IS_ADDR_LOOPBACK (&((struct sockaddr_in6 *) addr)->sin6_addr)))
907 if (GNUNET_YES == h->use_localaddresses)
909 add_ip_to_address_list (h, LAL_INTERFACE_ADDRESS, &s6->sin6_addr,
910 sizeof (struct in6_addr));
917 if ( (h->internal_address == NULL) &&
918 (h->server_proc == NULL) &&
919 (h->server_read_task == NULL) &&
920 (GNUNET_YES == isDefault) &&
921 ( (addr->sa_family == AF_INET) ||
922 (addr->sa_family == AF_INET6) ) )
924 /* no internal address configured, but we found a "default"
925 * interface, try using that as our 'internal' address */
926 h->internal_address =
927 GNUNET_strdup (inet_ntop (addr->sa_family, ip, buf, sizeof (buf)));
928 start_gnunet_nat_server (h);
935 * Task that restarts the gnunet-helper-nat-server process after a crash
936 * after a certain delay.
938 * @param cls the `struct GNUNET_NAT_Handle`
941 restart_nat_server (void *cls)
943 struct GNUNET_NAT_Handle *h = cls;
945 h->server_read_task = NULL;
946 start_gnunet_nat_server (h);
951 * We have been notified that gnunet-helper-nat-server has written
952 * something to stdout. Handle the output, then reschedule this
953 * function to be called again once more is available.
955 * @param cls the NAT handle
958 nat_server_read (void *cls)
960 struct GNUNET_NAT_Handle *h = cls;
965 const char *port_start;
966 struct sockaddr_in sin_addr;
968 h->server_read_task = NULL;
969 memset (mybuf, 0, sizeof (mybuf));
971 GNUNET_DISK_file_read (h->server_stdout_handle, mybuf, sizeof (mybuf));
974 LOG (GNUNET_ERROR_TYPE_DEBUG,
975 "Finished reading from server stdout with code: %d\n",
977 if (0 != GNUNET_OS_process_kill (h->server_proc, GNUNET_TERM_SIG))
978 GNUNET_log_from_strerror (GNUNET_ERROR_TYPE_WARNING, "nat", "kill");
979 GNUNET_OS_process_wait (h->server_proc);
980 GNUNET_OS_process_destroy (h->server_proc);
981 h->server_proc = NULL;
982 GNUNET_DISK_pipe_close (h->server_stdout);
983 h->server_stdout = NULL;
984 h->server_stdout_handle = NULL;
985 /* now try to restart it */
986 h->server_retry_delay = GNUNET_TIME_STD_BACKOFF (h->server_retry_delay);
987 h->server_read_task =
988 GNUNET_SCHEDULER_add_delayed (h->server_retry_delay,
989 &restart_nat_server, h);
994 for (i = 0; i < sizeof (mybuf); i++)
996 if (mybuf[i] == '\n')
1001 if ((mybuf[i] == ':') && (i + 1 < sizeof (mybuf)))
1004 port_start = &mybuf[i + 1];
1008 /* construct socket address of sender */
1009 memset (&sin_addr, 0, sizeof (sin_addr));
1010 sin_addr.sin_family = AF_INET;
1011 #if HAVE_SOCKADDR_IN_SIN_LEN
1012 sin_addr.sin_len = sizeof (sin_addr);
1014 if ((NULL == port_start) || (1 != SSCANF (port_start, "%d", &port)) ||
1015 (-1 == inet_pton (AF_INET, mybuf, &sin_addr.sin_addr)))
1017 /* should we restart gnunet-helper-nat-server? */
1018 LOG (GNUNET_ERROR_TYPE_WARNING, "nat",
1019 _("gnunet-helper-nat-server generated malformed address `%s'\n"),
1021 h->server_read_task =
1022 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1023 h->server_stdout_handle,
1024 &nat_server_read, h);
1027 sin_addr.sin_port = htons ((uint16_t) port);
1028 LOG (GNUNET_ERROR_TYPE_DEBUG, "gnunet-helper-nat-server read: %s:%d\n", mybuf,
1030 h->reversal_callback (h->callback_cls, (const struct sockaddr *) &sin_addr,
1032 h->server_read_task =
1033 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1034 h->server_stdout_handle,
1041 * Try to start the gnunet-helper-nat-server (if it is not
1044 * @param h handle to NAT
1047 start_gnunet_nat_server (struct GNUNET_NAT_Handle *h)
1051 if ((h->behind_nat == GNUNET_YES) && (h->enable_nat_server == GNUNET_YES) &&
1052 (h->internal_address != NULL) &&
1055 GNUNET_DISK_pipe (GNUNET_YES, GNUNET_YES, GNUNET_NO, GNUNET_YES))))
1057 LOG (GNUNET_ERROR_TYPE_DEBUG,
1058 "Starting `%s' at `%s'\n",
1059 "gnunet-helper-nat-server", h->internal_address);
1060 /* Start the server process */
1061 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-server");
1063 GNUNET_OS_start_process (GNUNET_NO, 0, NULL, h->server_stdout, NULL,
1065 "gnunet-helper-nat-server",
1066 h->internal_address, NULL);
1067 GNUNET_free (binary);
1068 if (h->server_proc == NULL)
1070 LOG (GNUNET_ERROR_TYPE_WARNING, "nat", _("Failed to start %s\n"),
1071 "gnunet-helper-nat-server");
1072 GNUNET_DISK_pipe_close (h->server_stdout);
1073 h->server_stdout = NULL;
1077 /* Close the write end of the read pipe */
1078 GNUNET_DISK_pipe_close_end (h->server_stdout, GNUNET_DISK_PIPE_END_WRITE);
1079 h->server_stdout_handle =
1080 GNUNET_DISK_pipe_handle (h->server_stdout, GNUNET_DISK_PIPE_END_READ);
1081 h->server_read_task =
1082 GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
1083 h->server_stdout_handle,
1084 &nat_server_read, h);
1091 * Task to scan the local network interfaces for IP addresses.
1093 * @param cls the NAT handle
1096 list_interfaces (void *cls)
1098 struct GNUNET_NAT_Handle *h = cls;
1101 remove_from_address_list_by_source (h, LAL_INTERFACE_ADDRESS);
1102 GNUNET_OS_network_interfaces_list (&process_interfaces, h);
1104 GNUNET_SCHEDULER_add_delayed (h->ifc_scan_frequency,
1105 &list_interfaces, h);
1110 * Callback with the result from the STUN request.
1112 * @param cls the NAT handle
1113 * @param result the status
1116 stun_request_callback (void *cls,
1117 enum GNUNET_NAT_StatusCode result)
1119 struct GNUNET_NAT_Handle *h = cls;
1121 h->stun_request = NULL;
1124 case GNUNET_NAT_ERROR_INTERNAL_NETWORK_ERROR:
1125 LOG (GNUNET_ERROR_TYPE_WARNING,
1126 "Failed to transmit STUN request\n");
1128 case GNUNET_NAT_ERROR_NOT_ONLINE:
1129 LOG (GNUNET_ERROR_TYPE_WARNING,
1130 "Failed to resolve STUN server (are we online?)\n");
1132 case GNUNET_NAT_ERROR_SUCCESS:
1133 /* all good, STUN request active */
1134 h->waiting_stun = GNUNET_YES;
1137 /* unexpected error code for STUN */
1144 * CHECK if is a valid STUN packet sending to GNUNET_NAT_stun_handle_packet().
1145 * It also check if it can handle the packet based on the NAT handler.
1146 * You don't need to call anything else to check if the packet is valid,
1148 * @param cls the NAT handle
1149 * @param data packet
1150 * @param len packet length
1151 * @return #GNUNET_NO if it can't decode, #GNUNET_YES if is a packet
1154 GNUNET_NAT_is_valid_stun_packet (void *cls,
1158 struct GNUNET_NAT_Handle *h = cls;
1159 struct sockaddr_in answer;
1161 /* We are not expecting a STUN message */
1162 if (GNUNET_YES != h->waiting_stun)
1165 /* We dont have STUN installed */
1169 /* Empty the answer structure */
1172 sizeof(struct sockaddr_in));
1174 /* Lets handle the packet*/
1176 GNUNET_NAT_stun_handle_packet (data,
1181 LOG (GNUNET_ERROR_TYPE_INFO,
1182 "STUN server returned %s:%d\n",
1183 inet_ntoa (answer.sin_addr),
1184 ntohs (answer.sin_port));
1185 /* Remove old IPs from previous STUN calls */
1186 remove_from_address_list_by_source (h,
1187 LAL_EXTERNAL_STUN_IP);
1188 /* Add new IP from STUN packet */
1189 add_to_address_list (h,
1190 LAL_EXTERNAL_STUN_IP,
1191 (const struct sockaddr *) &answer,
1192 sizeof (struct sockaddr_in));
1193 h->waiting_stun = GNUNET_NO;
1199 * Task to do a STUN request
1201 * @param cls the NAT handle
1204 process_stun (void *cls)
1206 struct GNUNET_NAT_Handle *h = cls;
1207 struct StunServerList *elem = h->actual_stun_server;
1209 h->stun_task = NULL;
1210 /* Make the request */
1211 LOG (GNUNET_ERROR_TYPE_INFO,
1212 "I will request the stun server %s:%i\n",
1215 if (NULL != h->stun_request)
1217 GNUNET_NAT_stun_make_request_cancel (h->stun_request);
1218 h->stun_request = NULL;
1220 h->waiting_stun = GNUNET_NO;
1222 = GNUNET_NAT_stun_make_request (elem->address,
1225 &stun_request_callback,
1227 if (NULL == h->stun_request)
1229 LOG (GNUNET_ERROR_TYPE_ERROR,
1230 "STUN request to %s:%i failed\n",
1235 GNUNET_SCHEDULER_add_delayed (h->stun_frequency,
1239 /* Set actual Server*/
1240 if (NULL != elem->next)
1242 h->actual_stun_server = elem->next;
1246 h->actual_stun_server = h->stun_servers_head;
1252 * Task to do a lookup on our hostname for IP addresses.
1254 * @param cls the NAT handle
1257 resolve_hostname (void *cls)
1259 struct GNUNET_NAT_Handle *h = cls;
1261 h->hostname_task = NULL;
1262 remove_from_address_list_by_source (h, LAL_HOSTNAME_DNS);
1263 GNUNET_assert (NULL == h->hostname_dns);
1265 GNUNET_RESOLVER_hostname_resolve (AF_UNSPEC,
1266 HOSTNAME_RESOLVE_TIMEOUT,
1267 &process_hostname_ip,
1273 * Task to do DNS lookup on our external hostname to
1274 * get DynDNS-IP addresses.
1276 * @param cls the NAT handle
1279 resolve_dns (void *cls)
1281 struct GNUNET_NAT_Handle *h = cls;
1282 struct LocalAddressList *pos;
1285 for (pos = h->lal_head; NULL != pos; pos = pos->next)
1286 if (pos->source == LAL_EXTERNAL_IP)
1287 pos->source = LAL_EXTERNAL_IP_OLD;
1288 LOG (GNUNET_ERROR_TYPE_DEBUG,
1289 "Resolving external address `%s'\n",
1290 h->external_address);
1291 GNUNET_assert (NULL == h->ext_dns);
1293 GNUNET_RESOLVER_ip_get (h->external_address,
1295 GNUNET_TIME_UNIT_MINUTES,
1296 &process_external_ip,
1302 * Add or remove UPnP-mapped addresses.
1304 * @param cls the `struct GNUNET_NAT_Handle`
1305 * @param add_remove #GNUNET_YES to mean the new public IP address, #GNUNET_NO to mean
1306 * the previous (now invalid) one
1307 * @param addr either the previous or the new public IP address
1308 * @param addrlen actual lenght of @a addr
1309 * @param ret GNUNET_NAT_ERROR_SUCCESS on success, otherwise an error code
1312 upnp_add (void *cls,
1314 const struct sockaddr *addr,
1316 enum GNUNET_NAT_StatusCode ret)
1318 struct GNUNET_NAT_Handle *h = cls;
1319 struct LocalAddressList *pos;
1320 struct LocalAddressList *next;
1323 if (GNUNET_NAT_ERROR_SUCCESS != ret)
1325 /* Error while running upnp client */
1326 LOG (GNUNET_ERROR_TYPE_ERROR,
1327 _("Error while running upnp client:\n"));
1328 //FIXME: convert error code to string
1332 if (GNUNET_YES == add_remove)
1334 add_to_address_list (h,
1340 else if (GNUNET_NO == add_remove)
1342 /* remove address */
1344 while (NULL != (pos = next))
1347 if ((pos->source != LAL_UPNP) || (pos->addrlen != addrlen) ||
1348 (0 != memcmp (&pos[1], addr, addrlen)))
1350 GNUNET_CONTAINER_DLL_remove (h->lal_head,
1353 if (NULL != h->address_callback)
1354 h->address_callback (h->callback_cls,
1356 (const struct sockaddr *) &pos[1],
1359 return; /* only remove once */
1361 /* asked to remove address that does not exist */
1362 LOG (GNUNET_ERROR_TYPE_ERROR,
1363 "Asked to remove unkown address `%s'\n",
1364 GNUNET_a2s(addr, addrlen));
1376 * Try to add a port mapping using UPnP.
1378 * @param h overall NAT handle
1379 * @param port port to map with UPnP
1382 add_minis (struct GNUNET_NAT_Handle *h,
1385 struct MiniList *ml;
1390 if (port == ml->port)
1391 return; /* already got this port */
1395 ml = GNUNET_new (struct MiniList);
1397 ml->mini = GNUNET_NAT_mini_map_start (port, h->is_tcp, &upnp_add, h);
1399 if (NULL == ml->mini)
1401 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1402 _("Failed to run upnp client for port %u\n"), ml->port);
1407 GNUNET_CONTAINER_DLL_insert (h->mini_head,
1414 * Task to add addresses from original bind to set of valid addrs.
1416 * @param h the NAT handle
1419 add_from_bind (struct GNUNET_NAT_Handle *h)
1421 static struct in6_addr any = IN6ADDR_ANY_INIT;
1424 struct sockaddr *sa;
1425 const struct sockaddr_in *v4;
1427 for (i = 0; i < h->num_local_addrs; i++)
1429 sa = h->local_addrs[i];
1430 switch (sa->sa_family)
1433 if (sizeof (struct sockaddr_in) != h->local_addrlens[i])
1438 v4 = (const struct sockaddr_in *) sa;
1439 if (0 != v4->sin_addr.s_addr)
1440 add_to_address_list (h,
1441 LAL_BINDTO_ADDRESS, sa,
1442 sizeof (struct sockaddr_in));
1445 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1446 "Running upnp client for address `%s'\n",
1447 GNUNET_a2s (sa,sizeof (struct sockaddr_in)));
1448 add_minis (h, ntohs (v4->sin_port));
1452 if (sizeof (struct sockaddr_in6) != h->local_addrlens[i])
1458 memcmp (&((const struct sockaddr_in6 *) sa)->sin6_addr,
1460 sizeof (struct in6_addr)))
1461 add_to_address_list (h,
1464 sizeof (struct sockaddr_in6));
1474 * Attempt to enable port redirection and detect public IP address contacting
1475 * UPnP or NAT-PMP routers on the local network. Use addr to specify to which
1476 * of the local host's addresses should the external port be mapped. The port
1477 * is taken from the corresponding sockaddr_in[6] field.
1479 * @param cfg configuration to use
1480 * @param is_tcp #GNUNET_YES for TCP, #GNUNET_NO for UDP
1481 * @param adv_port advertised port (port we are either bound to or that our OS
1482 * locally performs redirection from to our bound port).
1483 * @param num_addrs number of addresses in @a addrs
1484 * @param addrs the local addresses packets should be redirected to
1485 * @param addrlens actual lengths of the addresses
1486 * @param address_callback function to call everytime the public IP address changes
1487 * @param reversal_callback function to call if someone wants connection reversal from us
1488 * @param callback_cls closure for callbacks
1489 * @param sock used socket
1490 * @return NULL on error, otherwise handle that can be used to unregister
1492 struct GNUNET_NAT_Handle *
1493 GNUNET_NAT_register (const struct GNUNET_CONFIGURATION_Handle *cfg,
1496 unsigned int num_addrs,
1497 const struct sockaddr **addrs,
1498 const socklen_t *addrlens,
1499 GNUNET_NAT_AddressCallback address_callback,
1500 GNUNET_NAT_ReversalCallback reversal_callback,
1502 struct GNUNET_NETWORK_Handle *sock)
1504 struct GNUNET_NAT_Handle *h;
1505 struct in_addr in_addr;
1509 LOG (GNUNET_ERROR_TYPE_DEBUG,
1510 "Registered with NAT service at port %u with %u IP bound local addresses\n",
1511 (unsigned int) adv_port, num_addrs);
1512 h = GNUNET_new (struct GNUNET_NAT_Handle);
1513 h->server_retry_delay = GNUNET_TIME_UNIT_SECONDS;
1516 h->address_callback = address_callback;
1517 h->reversal_callback = reversal_callback;
1518 h->callback_cls = callback_cls;
1519 h->num_local_addrs = num_addrs;
1520 h->adv_port = adv_port;
1523 h->local_addrs = GNUNET_malloc (num_addrs * sizeof (struct sockaddr *));
1524 h->local_addrlens = GNUNET_malloc (num_addrs * sizeof (socklen_t));
1525 for (i = 0; i < num_addrs; i++)
1527 GNUNET_assert (addrlens[i] > 0);
1528 GNUNET_assert (addrs[i] != NULL);
1529 h->local_addrlens[i] = addrlens[i];
1530 h->local_addrs[i] = GNUNET_malloc (addrlens[i]);
1531 GNUNET_memcpy (h->local_addrs[i], addrs[i], addrlens[i]);
1535 GNUNET_CONFIGURATION_have_value (cfg, "nat", "INTERNAL_ADDRESS"))
1537 (void) GNUNET_CONFIGURATION_get_value_string (cfg, "nat",
1539 &h->internal_address);
1541 if ((h->internal_address != NULL) &&
1542 (inet_pton (AF_INET, h->internal_address, &in_addr) != 1))
1544 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1545 "nat", "INTERNAL_ADDRESS",
1547 GNUNET_free (h->internal_address);
1548 h->internal_address = NULL;
1552 GNUNET_CONFIGURATION_have_value (cfg, "nat", "EXTERNAL_ADDRESS"))
1554 (void) GNUNET_CONFIGURATION_get_value_string (cfg, "nat",
1556 &h->external_address);
1559 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "BEHIND_NAT");
1561 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "PUNCHED_NAT");
1562 h->enable_nat_client =
1563 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "ENABLE_ICMP_CLIENT");
1564 h->enable_nat_server =
1565 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "ENABLE_ICMP_SERVER");
1567 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "ENABLE_UPNP");
1568 h->use_localaddresses =
1569 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "USE_LOCALADDR");
1570 h->return_localaddress =
1571 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat",
1572 "RETURN_LOCAL_ADDRESSES");
1575 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "USE_HOSTNAME");
1577 GNUNET_CONFIGURATION_get_value_yesno (cfg, "nat", "DISABLEV6");
1579 GNUNET_CONFIGURATION_get_value_time (cfg, "nat", "DYNDNS_FREQUENCY",
1580 &h->dyndns_frequency))
1581 h->dyndns_frequency = DYNDNS_FREQUENCY;
1583 GNUNET_CONFIGURATION_get_value_time (cfg, "nat", "IFC_SCAN_FREQUENCY",
1584 &h->ifc_scan_frequency))
1585 h->ifc_scan_frequency = IFC_SCAN_FREQUENCY;
1587 GNUNET_CONFIGURATION_get_value_time (cfg, "nat", "HOSTNAME_DNS_FREQUENCY",
1588 &h->hostname_dns_frequency))
1589 h->hostname_dns_frequency = HOSTNAME_DNS_FREQUENCY;
1591 if (NULL == reversal_callback)
1592 h->enable_nat_server = GNUNET_NO;
1594 /* Check for UPnP client, disable immediately if not available */
1595 if ( (GNUNET_YES == h->enable_upnp) &&
1597 GNUNET_OS_check_helper_binary ("upnpc", GNUNET_NO, NULL)) )
1599 LOG (GNUNET_ERROR_TYPE_ERROR,
1600 _("UPnP enabled in configuration, but UPnP client `upnpc` command not found, disabling UPnP \n"));
1601 h->enable_upnp = GNUNET_NO;
1606 GNUNET_CONFIGURATION_get_value_yesno (cfg,
1611 GNUNET_CONFIGURATION_get_value_time (cfg,
1614 &h->stun_frequency))
1615 h->stun_frequency = STUN_FREQUENCY;
1618 /* Check if NAT was hole-punched */
1619 if ((NULL != h->address_callback) &&
1620 (NULL != h->external_address) &&
1621 (GNUNET_YES == h->nat_punched))
1623 h->dns_task = GNUNET_SCHEDULER_add_now (&resolve_dns, h);
1624 h->enable_nat_server = GNUNET_NO;
1625 h->enable_upnp = GNUNET_NO;
1626 h->use_stun = GNUNET_NO;
1630 LOG (GNUNET_ERROR_TYPE_DEBUG,
1631 "No external IP address given to add to our list of addresses\n");
1634 /* ENABLE STUN ONLY ON UDP */
1645 stun_servers = NULL;
1646 /* Lets process the servers*/
1647 (void) GNUNET_CONFIGURATION_get_value_string (cfg,
1652 if ( (NULL != stun_servers) &&
1653 (strlen (stun_servers) > 0) )
1656 for (pos = strlen (stun_servers) - 1;
1660 if (stun_servers[pos] == ':')
1663 stun_servers[pos] = '\0';
1666 if ((stun_servers[pos] == ' ') || (0 == pos))
1668 struct StunServerList *ml;
1670 /* Check if we do have a port */
1671 if ((0 == pos_port) || (pos_port <= pos))
1673 LOG (GNUNET_ERROR_TYPE_WARNING,
1674 "STUN server format mistake\n");
1678 ml = GNUNET_new (struct StunServerList);
1679 ml->port = atoi (&stun_servers[pos_port]);
1681 /* Remove trailing space */
1682 if (stun_servers[pos] == ' ')
1683 ml->address = GNUNET_strdup (&stun_servers[pos + 1]);
1685 ml->address = GNUNET_strdup (&stun_servers[pos]);
1686 LOG (GNUNET_ERROR_TYPE_DEBUG,
1687 "Found STUN server %s:%i\n",
1690 GNUNET_CONTAINER_DLL_insert (h->stun_servers_head,
1691 h->stun_servers_tail,
1693 stun_servers[pos] = '\0';
1699 GNUNET_log_config_missing (GNUNET_ERROR_TYPE_WARNING,
1705 /* Set the actual STUN server*/
1706 h->actual_stun_server = h->stun_servers_head;
1708 h->stun_task = GNUNET_SCHEDULER_add_now (&process_stun,
1710 GNUNET_free_non_null (stun_servers);
1714 /* Test for SUID binaries */
1715 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-server");
1716 if ( (GNUNET_YES == h->behind_nat) &&
1717 (GNUNET_YES == h->enable_nat_server) &&
1719 GNUNET_OS_check_helper_binary (binary,
1723 // use localhost as source for that one udp-port, ok for testing
1724 h->enable_nat_server = GNUNET_NO;
1725 LOG (GNUNET_ERROR_TYPE_WARNING,
1726 _("Configuration requires `%s', but binary is not installed properly (SUID bit not set). Option disabled.\n"),
1727 "gnunet-helper-nat-server");
1729 GNUNET_free (binary);
1730 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-client");
1731 if ((GNUNET_YES == h->enable_nat_client) &&
1733 GNUNET_OS_check_helper_binary (binary,
1735 "-d 127.0.0.1 127.0.0.2 42"))) /* none of these parameters are actually used in privilege testing mode */
1737 h->enable_nat_client = GNUNET_NO;
1738 LOG (GNUNET_ERROR_TYPE_WARNING,
1739 _("Configuration requires `%s', but binary is not installed properly (SUID bit not set). Option disabled.\n"),
1740 "gnunet-helper-nat-client");
1742 GNUNET_free (binary);
1743 start_gnunet_nat_server (h);
1745 /* FIXME: add support for UPnP, etc */
1747 if (NULL != h->address_callback)
1749 h->ifc_task = GNUNET_SCHEDULER_add_now (&list_interfaces,
1751 if (GNUNET_YES == h->use_hostname)
1752 h->hostname_task = GNUNET_SCHEDULER_add_now (&resolve_hostname,
1762 * Stop port redirection and public IP address detection for the given handle.
1763 * This frees the handle, after having sent the needed commands to close open ports.
1765 * @param h the handle to stop
1768 GNUNET_NAT_unregister (struct GNUNET_NAT_Handle *h)
1771 struct LocalAddressList *lal;
1772 struct MiniList *ml;
1773 struct StunServerList *ssl;
1775 LOG (GNUNET_ERROR_TYPE_DEBUG,
1776 "NAT unregister called\n");
1777 while (NULL != (ssl = h->stun_servers_head))
1779 GNUNET_CONTAINER_DLL_remove (h->stun_servers_head,
1780 h->stun_servers_tail,
1782 GNUNET_free (ssl->address);
1785 while (NULL != (lal = h->lal_head))
1787 GNUNET_CONTAINER_DLL_remove (h->lal_head,
1790 if (NULL != h->address_callback)
1791 h->address_callback (h->callback_cls,
1793 (const struct sockaddr *) &lal[1],
1797 while (NULL != (ml = h->mini_head))
1799 GNUNET_CONTAINER_DLL_remove (h->mini_head,
1802 if (NULL != ml->mini)
1803 GNUNET_NAT_mini_map_stop (ml->mini);
1806 if (NULL != h->ext_dns)
1808 GNUNET_RESOLVER_request_cancel (h->ext_dns);
1811 if (NULL != h->hostname_dns)
1813 GNUNET_RESOLVER_request_cancel (h->hostname_dns);
1814 h->hostname_dns = NULL;
1816 if (NULL != h->server_read_task)
1818 GNUNET_SCHEDULER_cancel (h->server_read_task);
1819 h->server_read_task = NULL;
1821 if (NULL != h->ifc_task)
1823 GNUNET_SCHEDULER_cancel (h->ifc_task);
1826 if (NULL != h->hostname_task)
1828 GNUNET_SCHEDULER_cancel (h->hostname_task);
1829 h->hostname_task = NULL;
1831 if (NULL != h->dns_task)
1833 GNUNET_SCHEDULER_cancel (h->dns_task);
1836 if (NULL != h->stun_task)
1838 GNUNET_SCHEDULER_cancel (h->stun_task);
1839 h->stun_task = NULL;
1841 if (NULL != h->stun_request)
1843 GNUNET_NAT_stun_make_request_cancel (h->stun_request);
1844 h->stun_request = NULL;
1846 if (NULL != h->server_proc)
1848 if (0 != GNUNET_OS_process_kill (h->server_proc,
1850 GNUNET_log_from_strerror (GNUNET_ERROR_TYPE_WARNING,
1853 GNUNET_OS_process_wait (h->server_proc);
1854 GNUNET_OS_process_destroy (h->server_proc);
1855 h->server_proc = NULL;
1856 GNUNET_DISK_pipe_close (h->server_stdout);
1857 h->server_stdout = NULL;
1858 h->server_stdout_handle = NULL;
1860 if (NULL != h->server_stdout)
1862 GNUNET_DISK_pipe_close (h->server_stdout);
1863 h->server_stdout = NULL;
1864 h->server_stdout_handle = NULL;
1866 for (i = 0; i < h->num_local_addrs; i++)
1867 GNUNET_free (h->local_addrs[i]);
1868 GNUNET_free_non_null (h->local_addrs);
1869 GNUNET_free_non_null (h->local_addrlens);
1870 GNUNET_free_non_null (h->external_address);
1871 GNUNET_free_non_null (h->internal_address);
1877 * We learned about a peer (possibly behind NAT) so run the
1878 * gnunet-helper-nat-client to send dummy ICMP responses to cause
1879 * that peer to connect to us (connection reversal).
1881 * @param h handle (used for configuration)
1882 * @param sa the address of the peer (IPv4-only)
1883 * @return #GNUNET_SYSERR on error, #GNUNET_NO if nat client is disabled,
1884 * #GNUNET_OK otherwise
1887 GNUNET_NAT_run_client (struct GNUNET_NAT_Handle *h,
1888 const struct sockaddr_in *sa)
1892 char inet4[INET_ADDRSTRLEN];
1893 char port_as_string[6];
1894 struct GNUNET_OS_Process *proc;
1897 if (GNUNET_YES != h->enable_nat_client)
1898 return GNUNET_NO; /* not permitted / possible */
1900 if (h->internal_address == NULL)
1902 LOG (GNUNET_ERROR_TYPE_WARNING, "nat",
1903 _("Internal IP address not known, cannot use ICMP NAT traversal method\n"));
1904 return GNUNET_SYSERR;
1906 GNUNET_assert (sa->sin_family == AF_INET);
1907 if (NULL == inet_ntop (AF_INET, &sa->sin_addr, inet4, INET_ADDRSTRLEN))
1909 GNUNET_log_from_strerror (GNUNET_ERROR_TYPE_WARNING,
1912 return GNUNET_SYSERR;
1914 GNUNET_snprintf (port_as_string,
1915 sizeof (port_as_string),
1918 LOG (GNUNET_ERROR_TYPE_DEBUG,
1919 _("Running gnunet-helper-nat-client %s %s %u\n"),
1920 h->internal_address,
1922 (unsigned int) h->adv_port);
1923 binary = GNUNET_OS_get_libexec_binary_path ("gnunet-helper-nat-client");
1925 GNUNET_OS_start_process (GNUNET_NO, 0, NULL, NULL, NULL,
1927 "gnunet-helper-nat-client",
1928 h->internal_address,
1929 inet4, port_as_string, NULL);
1930 GNUNET_free (binary);
1932 return GNUNET_SYSERR;
1933 /* we know that the gnunet-helper-nat-client will terminate virtually
1935 GNUNET_OS_process_wait (proc);
1936 GNUNET_OS_process_destroy (proc);
1942 * Test if the given address is (currently) a plausible IP address for this peer.
1944 * @param h the handle returned by register
1945 * @param addr IP address to test (IPv4 or IPv6)
1946 * @param addrlen number of bytes in @a addr
1947 * @return #GNUNET_YES if the address is plausible,
1948 * #GNUNET_NO if the address is not plausible,
1949 * #GNUNET_SYSERR if the address is malformed
1952 GNUNET_NAT_test_address (struct GNUNET_NAT_Handle *h,
1956 struct LocalAddressList *pos;
1957 const struct sockaddr_in *in4;
1958 const struct sockaddr_in6 *in6;
1959 char pbuf[INET6_ADDRSTRLEN+1];
1961 if ((addrlen != sizeof (struct in_addr)) &&
1962 (addrlen != sizeof (struct in6_addr)))
1965 return GNUNET_SYSERR;
1967 for (pos = h->lal_head; NULL != pos; pos = pos->next)
1969 if (pos->addrlen == sizeof (struct sockaddr_in))
1971 in4 = (struct sockaddr_in *) &pos[1];
1972 if ((addrlen == sizeof (struct in_addr)) &&
1973 (0 == memcmp (&in4->sin_addr, addr, sizeof (struct in_addr))))
1976 else if (pos->addrlen == sizeof (struct sockaddr_in6))
1978 in6 = (struct sockaddr_in6 *) &pos[1];
1979 if ((addrlen == sizeof (struct in6_addr)) &&
1980 (0 == memcmp (&in6->sin6_addr, addr, sizeof (struct in6_addr))))
1988 LOG (GNUNET_ERROR_TYPE_WARNING,
1989 "Asked to validate one of my addresses (%s) and validation failed!\n",
1990 inet_ntop ((addrlen == sizeof(struct in_addr))
1994 pbuf, sizeof (pbuf)));
1999 * Converts enum GNUNET_NAT_StatusCode to a string
2001 * @param err error code to resolve to a string
2002 * @return pointer to a static string containing the error code
2005 GNUNET_NAT_status2string (enum GNUNET_NAT_StatusCode err)
2009 case GNUNET_NAT_ERROR_SUCCESS:
2010 return _ ("Operation Successful");
2011 case GNUNET_NAT_ERROR_IPC_FAILURE:
2012 return _ ("Internal Failure (IPC, ...)");
2013 case GNUNET_NAT_ERROR_INTERNAL_NETWORK_ERROR:
2014 return _ ("Failure in network subsystem, check permissions.");
2015 case GNUNET_NAT_ERROR_TIMEOUT:
2016 return _ ("Encountered timeout while performing operation");
2017 case GNUNET_NAT_ERROR_NOT_ONLINE:
2018 return _ ("detected that we are offline");
2019 case GNUNET_NAT_ERROR_UPNPC_NOT_FOUND:
2020 return _ ("`upnpc` command not found");
2021 case GNUNET_NAT_ERROR_UPNPC_FAILED:
2022 return _ ("Failed to run `upnpc` command");
2023 case GNUNET_NAT_ERROR_UPNPC_TIMEOUT:
2024 return _ ("`upnpc' command took too long, process killed");
2025 case GNUNET_NAT_ERROR_UPNPC_PORTMAP_FAILED:
2026 return _ ("`upnpc' command failed to establish port mapping");
2027 case GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_NOT_FOUND:
2028 return _ ("`external-ip' command not found");
2029 case GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_FAILED:
2030 return _ ("Failed to run `external-ip` command");
2031 case GNUNET_NAT_ERROR_EXTERNAL_IP_UTILITY_OUTPUT_INVALID:
2032 return _ ("`external-ip' command output invalid");
2033 case GNUNET_NAT_ERROR_EXTERNAL_IP_ADDRESS_INVALID:
2034 return _ ("no valid address was returned by `external-ip'");
2035 case GNUNET_NAT_ERROR_NO_VALID_IF_IP_COMBO:
2036 return _ ("Could not determine interface with internal/local network address");
2037 case GNUNET_NAT_ERROR_HELPER_NAT_SERVER_NOT_FOUND:
2038 return _ ("No functioning gnunet-helper-nat-server installation found");
2039 case GNUNET_NAT_ERROR_NAT_TEST_START_FAILED:
2040 return _ ("NAT test could not be initialized");
2041 case GNUNET_NAT_ERROR_NAT_TEST_TIMEOUT:
2042 return _ ("NAT test timeout reached");
2043 case GNUNET_NAT_ERROR_NAT_REGISTER_FAILED:
2044 return _ ("could not register NAT");
2045 case GNUNET_NAT_ERROR_HELPER_NAT_CLIENT_NOT_FOUND:
2046 return _ ("No working gnunet-helper-nat-client installation found");
2050 return "unknown status code";