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[GNUnet-SVN] r35931 - gnunet/src/nat
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From: |
gnunet |
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Subject: |
[GNUnet-SVN] r35931 - gnunet/src/nat |
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Date: |
Mon, 15 Jun 2015 07:46:13 +0200 |
Author: bratao
Date: 2015-06-15 07:46:13 +0200 (Mon, 15 Jun 2015)
New Revision: 35931
Added:
gnunet/src/nat/test_stun.c
gnunet/src/nat/test_stun.h
Modified:
gnunet/src/nat/Makefile.am
gnunet/src/nat/nat.c
Log:
Initial import of STUN support
Modified: gnunet/src/nat/Makefile.am
===================================================================
--- gnunet/src/nat/Makefile.am 2015-06-12 07:59:35 UTC (rev 35930)
+++ gnunet/src/nat/Makefile.am 2015-06-15 05:46:13 UTC (rev 35931)
@@ -63,7 +63,8 @@
nat.c nat.h \
nat_auto.c \
nat_test.c \
- nat_mini.c
+ nat_mini.c \
+ nat_stun.c
libgnunetnat_la_LIBADD = \
$(top_builddir)/src/util/libgnunetutil.la \
@@ -76,7 +77,8 @@
check_PROGRAMS = \
test_nat \
test_nat_mini \
- test_nat_test
+ test_nat_test \
+ test_stun
if ENABLE_TEST_RUN
AM_TESTS_ENVIRONMENT=export
GNUNET_PREFIX=$${GNUNET_PREFIX:address@hidden@};export
PATH=$${GNUNET_PREFIX:address@hidden@}/bin:$$PATH;
@@ -102,6 +104,11 @@
libgnunetnat.la \
$(top_builddir)/src/util/libgnunetutil.la
+test_stun_SOURCES = \
+ test_stun.c
+test_stun_LDADD = \
+ libgnunetnat.la \
+ $(top_builddir)/src/util/libgnunetutil.la
EXTRA_DIST = \
test_nat_data.conf \
Modified: gnunet/src/nat/nat.c
===================================================================
--- gnunet/src/nat/nat.c 2015-06-12 07:59:35 UTC (rev 35930)
+++ gnunet/src/nat/nat.c 2015-06-15 05:46:13 UTC (rev 35931)
@@ -69,6 +69,11 @@
* given in the configuration (i.e. hole-punched DynDNS setup).
*/
LAL_EXTERNAL_IP,
+
+ /**
+ * Address was obtained by an external STUN server
+ */
+ LAL_EXTERNAL_STUN_IP,
/**
* Address was obtained by DNS resolution of the external hostname
Added: gnunet/src/nat/test_stun.c
===================================================================
--- gnunet/src/nat/test_stun.c (rev 0)
+++ gnunet/src/nat/test_stun.c 2015-06-15 05:46:13 UTC (rev 35931)
@@ -0,0 +1,514 @@
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2009, 2015 Christian Grothoff (and other contributing
authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * Testcase for STUN server resolution
+ *
+ * @file nat/test_stun.c
+ * @brief Testcase for STUN library
+ * @author Bruno Souza Cabral
+ * @autor Mark Spencer (Original code borrowed from Asterisk)
+ *
+ */
+
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+#include "gnunet_program_lib.h"
+#include "gnunet_scheduler_lib.h"
+#include "gnunet_nat_lib.h"
+
+
+#include "test_stun.h"
+
+
+/**
+ * The port the test service is running on (default 7895)
+ */
+static unsigned long port = 7895;
+
+static int ret = 1;
+
+/**
+ * The listen socket of the service for IPv4
+ */
+static struct GNUNET_NETWORK_Handle *lsock4;
+
+
+/**
+ * The listen task ID for IPv4
+ */
+static struct GNUNET_SCHEDULER_Task * ltask4;
+
+
+static char *stun_server = STUN_SERVER;
+static int stun_port = STUN_PORT;
+
+static int stun_debug = 1;
+
+
+struct stun_strings {
+ const int value;
+ const char *name;
+};
+
+
+static inline int stun_msg2class(int msg)
+{
+ return ((msg & 0x0010) >> 4) | ((msg & 0x0100) >> 7);
+}
+
+static inline int stun_msg2method(int msg)
+{
+ return (msg & 0x000f) | ((msg & 0x00e0) >> 1) | ((msg & 0x3e00) >> 2);
+}
+
+static inline int stun_msg2type(int class, int method)
+{
+ return ((class & 1) << 4) | ((class & 2) << 7) |
+ (method & 0x000f) | ((method & 0x0070) << 1) | ((method & 0x0f800)
<< 2);
+}
+
+/* helper function to print message names */
+static const char *stun_msg2str(int msg)
+{
+ static const struct stun_strings classes[] = {
+ { STUN_REQUEST, "Request" },
+ { STUN_INDICATION, "Indication" },
+ { STUN_RESPONSE, "Response" },
+ { STUN_ERROR_RESPONSE, "Error Response" },
+ { 0, NULL }
+};
+ static const struct stun_strings methods[] = {
+ { STUN_BINDING, "Binding" },
+ { 0, NULL }
+};
+ static char result[32];
+ const char *class = NULL, *method = NULL;
+ int i, value;
+
+ value = stun_msg2class(msg);
+ for (i = 0; classes[i].name; i++) {
+ class = classes[i].name;
+ if (classes[i].value == value)
+ break;
+ }
+ value = stun_msg2method(msg);
+ for (i = 0; methods[i].name; i++) {
+ method = methods[i].name;
+ if (methods[i].value == value)
+ break;
+ }
+ snprintf(result, sizeof(result), "%s %s",
+ method ? : "Unknown Method",
+ class ? : "Unknown Class Message");
+ return result;
+}
+
+/* helper function to print attribute names */
+static const char *stun_attr2str(int msg)
+{
+ static const struct stun_strings attrs[] = {
+ { STUN_MAPPED_ADDRESS, "Mapped Address" },
+ { STUN_RESPONSE_ADDRESS, "Response Address" },
+ { STUN_CHANGE_ADDRESS, "Change Address" },
+ { STUN_SOURCE_ADDRESS, "Source Address" },
+ { STUN_CHANGED_ADDRESS, "Changed Address" },
+ { STUN_USERNAME, "Username" },
+ { STUN_PASSWORD, "Password" },
+ { STUN_MESSAGE_INTEGRITY, "Message Integrity" },
+ { STUN_ERROR_CODE, "Error Code" },
+ { STUN_UNKNOWN_ATTRIBUTES, "Unknown Attributes" },
+ { STUN_REFLECTED_FROM, "Reflected From" },
+ { STUN_REALM, "Realm" },
+ { STUN_NONCE, "Nonce" },
+ { STUN_XOR_MAPPED_ADDRESS, "XOR Mapped Address" },
+ { STUN_MS_VERSION, "MS Version" },
+ { STUN_MS_XOR_MAPPED_ADDRESS, "MS XOR Mapped Address" },
+ { STUN_SOFTWARE, "Software" },
+ { STUN_ALTERNATE_SERVER, "Alternate Server" },
+ { STUN_FINGERPRINT, "Fingerprint" },
+ { 0, NULL }
+};
+ int i;
+
+ for (i = 0; attrs[i].name; i++) {
+ if (attrs[i].value == msg)
+ return attrs[i].name;
+ }
+ return "Unknown Attribute";
+}
+
+/* here we store credentials extracted from a message */
+struct stun_state {
+ unsigned short attr;
+};
+
+static int stun_process_attr(struct stun_state *state, struct stun_attr *attr)
+{
+ if (stun_debug)
+ fprintf(stderr, "Found STUN Attribute %s (%04x), length %d\n",
+ stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr),
ntohs(attr->len));
+ switch (ntohs(attr->attr)) {
+ case STUN_MAPPED_ADDRESS:
+ case STUN_XOR_MAPPED_ADDRESS:
+ case STUN_MS_XOR_MAPPED_ADDRESS:
+ break;
+ default:
+ if (stun_debug)
+ fprintf(stderr, "Ignoring STUN Attribute %s (%04x), length %d\n",
+ stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr),
ntohs(attr->len));
+ }
+ return 0;
+}
+
+/* append a string to an STUN message */
+static void append_attr_string(struct stun_attr **attr, int attrval, const
char *s, int *len, int *left)
+{
+ int str_length = strlen(s);
+ int attr_length = str_length + ((~(str_length - 1)) & 0x3);
+ int size = sizeof(**attr) + attr_length;
+ if (*left > size) {
+ (*attr)->attr = htons(attrval);
+ (*attr)->len = htons(attr_length);
+ memcpy((*attr)->value, s, str_length);
+ memset((*attr)->value + str_length, 0, attr_length - str_length);
+ (*attr) = (struct stun_attr *)((*attr)->value + attr_length);
+ *len += size;
+ *left -= size;
+ }
+}
+
+
+/* helper function to generate a random request id */
+static void stun_req_id(struct stun_header *req)
+{
+ int x;
+ srand(time(0));
+ req->magic = htonl(STUN_MAGIC_COOKIE);
+ for (x = 0; x < 3; x++)
+ req->id.id[x] = rand();
+}
+
+/* callback type to be invoked on stun responses. */
+typedef int (stun_cb_f)(struct stun_state *st, struct stun_attr *attr, void
*arg, unsigned int magic);
+
+/* handle an incoming STUN message.
+ *
+ * Do some basic sanity checks on packet size and content,
+ * try to extract a bit of information, and possibly reply.
+ * At the moment this only processes BIND requests, and returns
+ * the externally visible address of the request.
+ * If a callback is specified, invoke it with the attribute.
+ */
+static int stun_handle_packet(unsigned char *data, size_t len, stun_cb_f
*stun_cb, void *arg)
+{
+ struct stun_header *hdr = (struct stun_header *)data;
+ struct stun_attr *attr;
+ struct stun_state st;
+ int ret = STUN_IGNORE;
+ int x;
+
+ /* On entry, 'len' is the length of the udp payload. After the
+ * initial checks it becomes the size of unprocessed options,
+ * while 'data' is advanced accordingly.
+ */
+ if (len < sizeof(struct stun_header)) {
+ fprintf(stderr, "Runt STUN packet (only %d, wanting at least %d)\n",
(int) len, (int) sizeof(struct stun_header));
+ return -1;
+ }
+ len -= sizeof(struct stun_header);
+ data += sizeof(struct stun_header);
+ x = ntohs(hdr->msglen); /* len as advertised in the message */
+ if (stun_debug)
+ fprintf(stderr, "STUN Packet, msg %s (%04x), length: %d\n",
stun_msg2str(ntohs(hdr->msgtype)), ntohs(hdr->msgtype), x);
+ if (x > len) {
+ fprintf(stderr, "Scrambled STUN packet length (got %d, expecting
%d)\n", x, (int)len);
+ } else
+ len = x;
+ memset(&st,0, sizeof(st));
+
+ while (len) {
+ if (len < sizeof(struct stun_attr)) {
+ fprintf(stderr, "Runt Attribute (got %d, expecting %d)\n",
(int)len, (int) sizeof(struct stun_attr));
+ break;
+ }
+ attr = (struct stun_attr *)data;
+
+ /* compute total attribute length */
+ x = ntohs(attr->len) + sizeof(struct stun_attr);
+ if (x > len) {
+ fprintf(stderr, "Inconsistent Attribute (length %d exceeds
remaining msg len %d)\n", x, (int)len);
+ break;
+ }
+ if (stun_cb)
+ stun_cb(&st, attr, arg, hdr->magic);
+ if (stun_process_attr(&st, attr)) {
+ fprintf(stderr, "Failed to handle attribute %s (%04x)\n",
stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr));
+ break;
+ }
+ /* Clear attribute id: in case previous entry was a string,
+ * this will act as the terminator for the string.
+ */
+ attr->attr = 0;
+ data += x;
+ len -= x;
+ }
+ /* Null terminate any string.
+ * XXX NOTE, we write past the size of the buffer passed by the
+ * caller, so this is potentially dangerous. The only thing that
+ * saves us is that usually we read the incoming message in a
+ * much larger buffer
+ */
+ *data = '\0';
+
+ return ret;
+}
+
+/* Extract the STUN_MAPPED_ADDRESS from the stun response.
+ * This is used as a callback for stun_handle_response
+ * when called from stun_request.
+ */
+static int stun_get_mapped(struct stun_state *st, struct stun_attr *attr, void
*arg, unsigned int magic)
+{
+ struct stun_addr *returned_addr = (struct stun_addr *)(attr + 1);
+ struct sockaddr_in *sa = (struct sockaddr_in *)arg;
+ unsigned short type = ntohs(attr->attr);
+
+ switch (type) {
+ case STUN_MAPPED_ADDRESS:
+ if (st->attr == STUN_XOR_MAPPED_ADDRESS ||
+ st->attr == STUN_MS_XOR_MAPPED_ADDRESS)
+ return 1;
+ magic = 0;
+ break;
+ case STUN_MS_XOR_MAPPED_ADDRESS:
+ if (st->attr == STUN_XOR_MAPPED_ADDRESS)
+ return 1;
+ break;
+ case STUN_XOR_MAPPED_ADDRESS:
+ break;
+ default:
+ return 1;
+ }
+ if (ntohs(attr->len) < 8 && returned_addr->family != 1)
+ return 1;
+
+ st->attr = type;
+ sa->sin_port = returned_addr->port ^ htons(ntohl(magic) >> 16);
+ sa->sin_addr.s_addr = returned_addr->addr ^ magic;
+ return 0;
+}
+
+/* Generic STUN request
+ * Send a generic stun request to the server specified,
+ * possibly waiting for a reply and filling the 'reply' field with
+ * the externally visible address.
+
+ * \param s the socket used to send the request
+ * \return 0 on success, other values on error.
+ */
+int stun_request(struct GNUNET_NETWORK_Handle * sock)
+{
+ struct stun_header *req;
+ unsigned char reqdata[1024];
+ int reqlen, reqleft;
+ struct stun_attr *attr;
+
+
+
+
+ struct sockaddr_in server;
+ struct hostent *hostinfo = gethostbyname(stun_server);
+ if (!hostinfo) {
+ fprintf(stderr, "Error resolving host %s\n", stun_server);
+ return -1;
+ }
+ memset(&server,0, sizeof(server));
+ server.sin_family = AF_INET;
+ server.sin_addr = *(struct in_addr*) hostinfo->h_addr;
+ server.sin_port = htons(stun_port);
+
+
+
+ req = (struct stun_header *)reqdata;
+ stun_req_id(req);
+ reqlen = 0;
+ reqleft = sizeof(reqdata) - sizeof(struct stun_header);
+ req->msgtype = 0;
+ req->msglen = 0;
+ attr = (struct stun_attr *)req->ies;
+
+ append_attr_string(&attr, STUN_SOFTWARE, PACKAGE " v" VERSION_PACKAGE,
&reqlen, &reqleft);
+ req->msglen = htons(reqlen);
+ req->msgtype = htons(stun_msg2type(STUN_REQUEST, STUN_BINDING));
+
+
+ if (-1 == GNUNET_NETWORK_socket_sendto (sock, req, ntohs(req->msglen) +
sizeof(*req),
+ (const struct sockaddr *) &server, sizeof
(server)))
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "sendto");
+ }
+
+ return -1;
+}
+
+static void print_answer(struct sockaddr_in* answer)
+{
+ printf("External IP is: %s , with port %d\n",
inet_ntoa(answer->sin_addr), ntohs(answer->sin_port));
+}
+
+
+/**
+ * Activity on our incoming socket. Read data from the
+ * incoming connection.
+ *
+ * @param cls
+ * @param tc scheduler context
+ */
+static void
+do_udp_read (void *cls,
+ const struct GNUNET_SCHEDULER_TaskContext *tc)
+{
+ //struct GNUNET_NAT_Test *tst = cls;
+ unsigned char reply_buf[1024];
+ ssize_t rlen;
+ struct sockaddr_in answer;
+
+
+ if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
+ (GNUNET_NETWORK_fdset_isset (tc->read_ready,
+ lsock4)))
+ {
+ rlen = GNUNET_NETWORK_socket_recv (lsock4, reply_buf, sizeof
(reply_buf));
+ printf("Recivied something of size %d", rlen);
+
+ //Lets handle the packet
+ memset(&answer, 0, sizeof(struct sockaddr_in));
+ stun_handle_packet(reply_buf, rlen, stun_get_mapped, &answer);
+ //Print the anser
+ //TODO: Delete the object
+ ret = 0;
+ print_answer(&answer);
+
+
+ }
+}
+
+
+/**
+ * Create an IPv4 listen socket bound to our port.
+ *
+ * @return NULL on error
+ */
+static struct GNUNET_NETWORK_Handle *
+ bind_v4 ()
+{
+ struct GNUNET_NETWORK_Handle *ls;
+ struct sockaddr_in sa4;
+ int eno;
+
+ memset (&sa4, 0, sizeof (sa4));
+ sa4.sin_family = AF_INET;
+ sa4.sin_port = htons (port);
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ sa4.sin_len = sizeof (sa4);
+#endif
+ ls = GNUNET_NETWORK_socket_create (AF_INET,
+ SOCK_DGRAM,
+ 0);
+ if (NULL == ls)
+ return NULL;
+ if (GNUNET_OK !=
+ GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
+ sizeof (sa4)))
+ {
+ eno = errno;
+ GNUNET_NETWORK_socket_close (ls);
+ errno = eno;
+ return NULL;
+ }
+ return ls;
+}
+
+
+
+/**
+ * Main function run with scheduler.
+ */
+
+
+static void
+run (void *cls, char *const *args, const char *cfgfile,
+ const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+
+
+ //Lets create the socket
+ lsock4 = bind_v4 ();
+ if (NULL == lsock4)
+ {
+ GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
+ }
+ else
+ {
+ printf("Binded, now will call add_read\n");
+ //Lets call our function now when it accepts
+ ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
+ lsock4, &do_udp_read, NULL);
+
+ }
+ if(NULL == lsock4 )
+ {
+ GNUNET_SCHEDULER_shutdown ();
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Service listens on port %u\n",
+ port);
+ printf("Start main event\n");
+ stun_request(lsock4);
+ //Main event
+ //main_task = GNUNET_SCHEDULER_add_delayed (timeout, &do_timeout, nh);
+
+}
+
+
+int
+main (int argc, char *const argv[])
+{
+ struct GNUNET_GETOPT_CommandLineOption options[] = {
+ GNUNET_GETOPT_OPTION_END
+ };
+
+ char *const argv_prog[] = {
+ "test-stun",
+ NULL
+ };
+ GNUNET_log_setup ("test-stun",
+ "WARNING",
+ NULL);
+
+ GNUNET_PROGRAM_run (1, argv_prog, "test-stun", "nohelp", options, &run,
NULL);
+
+ return ret;
+}
+
+/* end of test_nat.c */
Added: gnunet/src/nat/test_stun.h
===================================================================
--- gnunet/src/nat/test_stun.h (rev 0)
+++ gnunet/src/nat/test_stun.h 2015-06-15 05:46:13 UTC (rev 35931)
@@ -0,0 +1,108 @@
+/*
+ This file is part of GNUnet.
+ Copyright (C) 2009, 2015 Christian Grothoff (and other contributing
authors)
+
+ GNUnet is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3, 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GNUnet; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * Testcase for STUN server resolution
+ *
+ * @file nat/test_stun.h
+ * @brief Testcase for STUN library
+ * @author Bruno Souza Cabral
+ * @autor Mark Spencer (Original code borrowed from Asterisk)
+ *
+ */
+
+#define PACKAGE "gnunet"
+#define VERSION_PACKAGE "0.4"
+
+#define STUN_SERVER "stun.services.mozilla.com"
+#define STUN_PORT 3478
+#define STUN_COUNT 3
+#define STUN_RTO 500 /* ms */
+#define STUN_MRC 3
+
+typedef struct { unsigned int id[3]; } __attribute__((packed)) stun_trans_id;
+
+struct stun_header {
+ unsigned short msgtype;
+ unsigned short msglen;
+ unsigned int magic;
+ stun_trans_id id;
+ unsigned char ies[0];
+} __attribute__((packed));
+
+struct stun_attr {
+ unsigned short attr;
+ unsigned short len;
+ unsigned char value[0];
+} __attribute__((packed));
+
+/*
+ * The format normally used for addresses carried by STUN messages.
+ */
+struct stun_addr {
+ unsigned char unused;
+ unsigned char family;
+ unsigned short port;
+ unsigned int addr;
+} __attribute__((packed));
+
+#define STUN_IGNORE (0)
+#define STUN_ACCEPT (1)
+
+#define STUN_MAGIC_COOKIE 0x2112A442
+
+/* STUN message classes */
+#define STUN_REQUEST 0x0000
+#define STUN_INDICATION 0x0001
+#define STUN_RESPONSE 0x0002
+#define STUN_ERROR_RESPONSE 0x0003
+
+/* STUN message methods */
+#define STUN_BINDING 0x0001
+#define STUN_SHARED_SECRET 0x0002
+#define STUN_ALLOCATE 0x0003
+#define STUN_REFRESH 0x0004
+#define STUN_SEND 0x0006
+#define STUN_DATA 0x0007
+#define STUN_CREATE_PERMISSION 0x0008
+#define STUN_CHANNEL_BIND 0x0009
+
+/* Basic attribute types in stun messages.
+ * Messages can also contain custom attributes (codes above 0x7fff)
+ */
+#define STUN_MAPPED_ADDRESS 0x0001
+#define STUN_RESPONSE_ADDRESS 0x0002
+#define STUN_CHANGE_ADDRESS 0x0003
+#define STUN_SOURCE_ADDRESS 0x0004
+#define STUN_CHANGED_ADDRESS 0x0005
+#define STUN_USERNAME 0x0006
+#define STUN_PASSWORD 0x0007
+#define STUN_MESSAGE_INTEGRITY 0x0008
+#define STUN_ERROR_CODE 0x0009
+#define STUN_UNKNOWN_ATTRIBUTES 0x000a
+#define STUN_REFLECTED_FROM 0x000b
+#define STUN_REALM 0x0014
+#define STUN_NONCE 0x0015
+#define STUN_XOR_MAPPED_ADDRESS 0x0020
+#define STUN_MS_VERSION 0x8008
+#define STUN_MS_XOR_MAPPED_ADDRESS 0x8020
+#define STUN_SOFTWARE 0x8022
+#define STUN_ALTERNATE_SERVER 0x8023
+#define STUN_FINGERPRINT 0x8028
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