From 20d8a41eaa19064d16e9a004dea2d9abcdbd9731 Mon Sep 17 00:00:00 2001 From: Bruno Cabral Date: Wed, 24 Jun 2015 20:00:00 +0000 Subject: Commit rewrite before moving to GNUNET_NAT functions --- src/nat/test_stun.c | 1131 ++++++++++++++++++++++++++++----------------------- 1 file changed, 617 insertions(+), 514 deletions(-) (limited to 'src/nat/test_stun.c') diff --git a/src/nat/test_stun.c b/src/nat/test_stun.c index 8448f7f85..086789f27 100644 --- a/src/nat/test_stun.c +++ b/src/nat/test_stun.c @@ -1,514 +1,617 @@ -/* - 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 */ +/* + 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 - Major rewrite. + * @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" + +#define LOG(kind,...) GNUNET_log_from (kind, "stun", __VA_ARGS__) + +/** + * The port the test service is running on (default 7895) + */ +static unsigned long port = 7895; +static int ret = 1; + +static char *stun_server = STUN_SERVER; +static int stun_port = STUN_PORT; + +/** + * 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; + + + +/** + * Handle to a request given to the resolver. Can be used to cancel + * the request prior to the timeout or successful execution. Also + * used to track our internal state for the request. + */ +struct GNUNET_NAT_StunRequestHandle { + + /** + * Handle to a pending DNS lookup request. + */ + struct GNUNET_RESOLVER_RequestHandle *dns_active; + + + /** + * Handle to the listen socket + */ + struct GNUNET_NETWORK_Handle * sock; + +}; + + + + +/* here we store credentials extracted from a message */ +struct StunState { + uint16_t attr; +}; + +/* callback type to be invoked on stun responses. */ +typedef int (stun_cb_f)(struct StunState *st, struct stun_attr *attr, void *arg, unsigned int magic); + + + +/** + * Convert a message to a StunClass + * + * @param msg the received message + * @return the converted StunClass + */ +static int decode_class(int msg) +{ + return ((msg & 0x0010) >> 4) | ((msg & 0x0100) >> 7); +} + +/** + * Convert a message to a StunMethod + * + * @param msg the received message + * @return the converted StunMethod + */ +static int decode_method(int msg) +{ + return (msg & 0x000f) | ((msg & 0x00e0) >> 1) | ((msg & 0x3e00) >> 2); +} + +/** + * Encode a class and method to a compatible STUN format + * + * @param msg_class class to be converted + * @param method method to be converted + * @return message in a STUN compatible format + */ +static int encode_message(StunClasses msg_class, StunMethods method) +{ + return ((msg_class & 1) << 4) | ((msg_class & 2) << 7) | + (method & 0x000f) | ((method & 0x0070) << 1) | ((method & 0x0f800) << 2); +} + +/* helper function to print message names */ +static const char *stun_msg2str(int msg) +{ + + const struct { enum StunClasses value; const char *name; } classes[] = { + { STUN_REQUEST, "Request" }, + { STUN_INDICATION, "Indication" }, + { STUN_RESPONSE, "Response" }, + { STUN_ERROR_RESPONSE, "Error Response" }, + { 0, NULL } + }; + + const struct { enum StunMethods value; const char *name; } methods[] = { + { STUN_BINDING, "Binding" }, + { 0, NULL } + }; + + static char result[32]; + const char *msg_class = NULL; + const char *method = NULL; + int i; + int value; + + value = decode_class(msg); + for (i = 0; classes[i].name; i++) { + msg_class = classes[i].name; + if (classes[i].value == value) + break; + } + value = decode_method(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", + msg_class ? : "Unknown Class Message"); + return result; +} + +/* helper function to print attribute names */ +static const char *stun_attr2str(int msg) +{ + const struct { enum StunAttributes value; const char *name; } 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"; +} + + + +static int stun_process_attr(struct StunState *state, struct stun_attr *attr) +{ + LOG (GNUNET_ERROR_TYPE_INFO, + "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: + LOG (GNUNET_ERROR_TYPE_INFO, + "Ignoring STUN Attribute %s (%04x), length %d\n", + stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr), ntohs(attr->len)); + + } + return 0; +} + + +/* helper function to generate a random request id */ +static void +generate_request_id(struct stun_header *req) +{ + int x; + req->magic = htonl(STUN_MAGIC_COOKIE); + for (x = 0; x < 3; x++) + req->id.id[x] = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, + UINT32_MAX); +} + + +/* 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(const uint8_t *data, size_t len, stun_cb_f *stun_cb, void *arg) +{ + struct stun_header *hdr = (struct stun_header *)data; + struct stun_attr *attr; + struct StunState st; + int ret = STUN_IGNORE; + + uint32_t advertised_message_size; + uint32_t message_magic_cookie; + + + /* 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)) { + LOG (GNUNET_ERROR_TYPE_INFO, + "STUN packet too short (only %d, wanting at least %d)\n", (int) len, (int) sizeof(struct stun_header)); + GNUNET_break_op (0); + return -1; + } + /* Skip header as it is already in hdr */ + len -= sizeof(struct stun_header); + data += sizeof(struct stun_header); + + /* len as advertised in the message */ + advertised_message_size = ntohs(hdr->msglen); + + message_magic_cookie = ntohl(hdr->magic); + /* Compare if the cookie match */ + if(STUN_MAGIC_COOKIE != message_magic_cookie){ + LOG (GNUNET_ERROR_TYPE_INFO, + "Invalid magic cookie \n"); + GNUNET_break_op (0); + return -1; + } + + + LOG (GNUNET_ERROR_TYPE_INFO, "STUN Packet, msg %s (%04x), length: %d\n", stun_msg2str(ntohs(hdr->msgtype)), ntohs(hdr->msgtype), advertised_message_size); + + + if (advertised_message_size > len) { + LOG (GNUNET_ERROR_TYPE_INFO, "Scrambled STUN packet length (got %d, expecting %d)\n", advertised_message_size, (int)len); + GNUNET_break_op (0); + } else { + len = advertised_message_size; + } + /* Zero the struct */ + memset(&st,0, sizeof(st)); + + while (len > 0) { + if (len < sizeof(struct stun_attr)) { + LOG (GNUNET_ERROR_TYPE_INFO, "Attribute too short (got %d, expecting %d)\n", (int)len, (int) sizeof(struct stun_attr)); + GNUNET_break_op (0); + break; + } + attr = (struct stun_attr *)data; + + /* compute total attribute length */ + advertised_message_size = ntohs(attr->len) + sizeof(struct stun_attr); + + /* Check if we still have space in our buffer */ + if (advertised_message_size > len ) { + LOG (GNUNET_ERROR_TYPE_INFO, "Inconsistent Attribute (length %d exceeds remaining msg len %d)\n", advertised_message_size, (int)len); + GNUNET_break_op (0); + break; + } + + if (stun_cb){ + stun_cb(&st, attr, arg, hdr->magic); + } + + if (stun_process_attr(&st, attr)) { + LOG (GNUNET_ERROR_TYPE_INFO, "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 += advertised_message_size; + len -= advertised_message_size; + } + + 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 StunState *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; +} + + +/** + * Try to establish a connection given the specified address. + * This function is called by the resolver once we have a DNS reply. + * + * @param cls our `struct GNUNET_CONNECTION_Handle *` + * @param addr address to try, NULL for "last call" + * @param addrlen length of @a addr + */ +static void +try_connect_using_address (void *cls, + const struct sockaddr *addr, + socklen_t addrlen) { + + + struct GNUNET_NAT_StunRequestHandle *request = cls; + + struct stun_header *req; + uint8_t reqdata[1024]; + int reqlen; + + if(NULL == request) { + LOG (GNUNET_ERROR_TYPE_INFO, "Empty request\n"); + return; + } + + + if (NULL == addr) { + request->dns_active = NULL; + LOG (GNUNET_ERROR_TYPE_INFO, "Error resolving host %s\n", stun_server); + //BREAk op + return; + } + + + + struct sockaddr_in server; + + + memset(&server,0, sizeof(server)); + server.sin_family = AF_INET; + + struct sockaddr_in *addr_in = (struct sockaddr_in *)addr; + + server.sin_addr = addr_in->sin_addr; + server.sin_port = htons(stun_port); + + + /*Craft the simplest possible STUN packet. A request binding*/ + req = (struct stun_header *)reqdata; + generate_request_id(req); + reqlen = 0; + req->msgtype = 0; + req->msglen = 0; + + + req->msglen = htons(reqlen); + req->msgtype = htons(encode_message(STUN_REQUEST, STUN_BINDING)); + + + if (-1 == GNUNET_NETWORK_socket_sendto (request->sock, req, ntohs(req->msglen) + sizeof(*req), + (const struct sockaddr *) &server, sizeof (server))) + { + GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "Failt to sendto"); + } + +} + + +/* 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. + */ +struct GNUNET_NAT_StunRequestHandle * +stun_request(struct GNUNET_NETWORK_Handle * sock) +{ + + + struct GNUNET_NAT_StunRequestHandle *rh; + + + rh = GNUNET_malloc (sizeof (struct GNUNET_NAT_StunRequestHandle)); + + rh->sock = sock; + + rh->dns_active = GNUNET_RESOLVER_ip_get (stun_server, AF_INET, + GNUNET_CONNECTION_CONNECT_RETRY_TIMEOUT, + &try_connect_using_address, rh); + + + + + return rh; +} + +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_INFO, + "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 */ -- cgit v1.2.3