2 This file is part of GNUnet.
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3 Copyright (C) 2009, 2015 Christian Grothoff (and other contributing authors)
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5 GNUnet is free software; you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published
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7 by the Free Software Foundation; either version 3, or (at your
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8 option) any later version.
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10 GNUnet is distributed in the hope that it will be useful, but
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 General Public License for more details.
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15 You should have received a copy of the GNU General Public License
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16 along with GNUnet; see the file COPYING. If not, write to the
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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18 Boston, MA 02111-1307, USA.
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22 * Testcase for STUN server resolution
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24 * @file nat/test_stun.c
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25 * @brief Testcase for STUN library
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26 * @author Bruno Souza Cabral
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27 * @autor Mark Spencer (Original code borrowed from Asterisk)
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32 #include "platform.h"
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33 #include "gnunet_util_lib.h"
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34 #include "gnunet_program_lib.h"
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35 #include "gnunet_scheduler_lib.h"
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36 #include "gnunet_nat_lib.h"
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39 #include "test_stun.h"
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43 * The port the test service is running on (default 7895)
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45 static unsigned long port = 7895;
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50 * The listen socket of the service for IPv4
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52 static struct GNUNET_NETWORK_Handle *lsock4;
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56 * The listen task ID for IPv4
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58 static struct GNUNET_SCHEDULER_Task * ltask4;
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61 static char *stun_server = STUN_SERVER;
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62 static int stun_port = STUN_PORT;
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64 static int stun_debug = 1;
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67 struct stun_strings {
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73 static inline int stun_msg2class(int msg)
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75 return ((msg & 0x0010) >> 4) | ((msg & 0x0100) >> 7);
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78 static inline int stun_msg2method(int msg)
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80 return (msg & 0x000f) | ((msg & 0x00e0) >> 1) | ((msg & 0x3e00) >> 2);
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83 static inline int stun_msg2type(int class, int method)
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85 return ((class & 1) << 4) | ((class & 2) << 7) |
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86 (method & 0x000f) | ((method & 0x0070) << 1) | ((method & 0x0f800) << 2);
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89 /* helper function to print message names */
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90 static const char *stun_msg2str(int msg)
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92 static const struct stun_strings classes[] = {
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93 { STUN_REQUEST, "Request" },
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94 { STUN_INDICATION, "Indication" },
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95 { STUN_RESPONSE, "Response" },
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96 { STUN_ERROR_RESPONSE, "Error Response" },
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99 static const struct stun_strings methods[] = {
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100 { STUN_BINDING, "Binding" },
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103 static char result[32];
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104 const char *class = NULL, *method = NULL;
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107 value = stun_msg2class(msg);
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108 for (i = 0; classes[i].name; i++) {
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109 class = classes[i].name;
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110 if (classes[i].value == value)
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113 value = stun_msg2method(msg);
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114 for (i = 0; methods[i].name; i++) {
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115 method = methods[i].name;
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116 if (methods[i].value == value)
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119 snprintf(result, sizeof(result), "%s %s",
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120 method ? : "Unknown Method",
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121 class ? : "Unknown Class Message");
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125 /* helper function to print attribute names */
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126 static const char *stun_attr2str(int msg)
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128 static const struct stun_strings attrs[] = {
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129 { STUN_MAPPED_ADDRESS, "Mapped Address" },
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130 { STUN_RESPONSE_ADDRESS, "Response Address" },
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131 { STUN_CHANGE_ADDRESS, "Change Address" },
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132 { STUN_SOURCE_ADDRESS, "Source Address" },
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133 { STUN_CHANGED_ADDRESS, "Changed Address" },
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134 { STUN_USERNAME, "Username" },
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135 { STUN_PASSWORD, "Password" },
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136 { STUN_MESSAGE_INTEGRITY, "Message Integrity" },
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137 { STUN_ERROR_CODE, "Error Code" },
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138 { STUN_UNKNOWN_ATTRIBUTES, "Unknown Attributes" },
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139 { STUN_REFLECTED_FROM, "Reflected From" },
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140 { STUN_REALM, "Realm" },
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141 { STUN_NONCE, "Nonce" },
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142 { STUN_XOR_MAPPED_ADDRESS, "XOR Mapped Address" },
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143 { STUN_MS_VERSION, "MS Version" },
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144 { STUN_MS_XOR_MAPPED_ADDRESS, "MS XOR Mapped Address" },
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145 { STUN_SOFTWARE, "Software" },
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146 { STUN_ALTERNATE_SERVER, "Alternate Server" },
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147 { STUN_FINGERPRINT, "Fingerprint" },
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152 for (i = 0; attrs[i].name; i++) {
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153 if (attrs[i].value == msg)
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154 return attrs[i].name;
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156 return "Unknown Attribute";
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159 /* here we store credentials extracted from a message */
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160 struct stun_state {
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161 unsigned short attr;
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164 static int stun_process_attr(struct stun_state *state, struct stun_attr *attr)
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167 fprintf(stderr, "Found STUN Attribute %s (%04x), length %d\n",
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168 stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr), ntohs(attr->len));
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169 switch (ntohs(attr->attr)) {
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170 case STUN_MAPPED_ADDRESS:
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171 case STUN_XOR_MAPPED_ADDRESS:
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172 case STUN_MS_XOR_MAPPED_ADDRESS:
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176 fprintf(stderr, "Ignoring STUN Attribute %s (%04x), length %d\n",
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177 stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr), ntohs(attr->len));
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182 /* append a string to an STUN message */
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183 static void append_attr_string(struct stun_attr **attr, int attrval, const char *s, int *len, int *left)
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185 int str_length = strlen(s);
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186 int attr_length = str_length + ((~(str_length - 1)) & 0x3);
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187 int size = sizeof(**attr) + attr_length;
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188 if (*left > size) {
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189 (*attr)->attr = htons(attrval);
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190 (*attr)->len = htons(attr_length);
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191 memcpy((*attr)->value, s, str_length);
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192 memset((*attr)->value + str_length, 0, attr_length - str_length);
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193 (*attr) = (struct stun_attr *)((*attr)->value + attr_length);
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200 /* helper function to generate a random request id */
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201 static void stun_req_id(struct stun_header *req)
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205 req->magic = htonl(STUN_MAGIC_COOKIE);
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206 for (x = 0; x < 3; x++)
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207 req->id.id[x] = rand();
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210 /* callback type to be invoked on stun responses. */
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211 typedef int (stun_cb_f)(struct stun_state *st, struct stun_attr *attr, void *arg, unsigned int magic);
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213 /* handle an incoming STUN message.
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215 * Do some basic sanity checks on packet size and content,
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216 * try to extract a bit of information, and possibly reply.
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217 * At the moment this only processes BIND requests, and returns
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218 * the externally visible address of the request.
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219 * If a callback is specified, invoke it with the attribute.
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221 static int stun_handle_packet(unsigned char *data, size_t len, stun_cb_f *stun_cb, void *arg)
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223 struct stun_header *hdr = (struct stun_header *)data;
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224 struct stun_attr *attr;
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225 struct stun_state st;
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226 int ret = STUN_IGNORE;
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229 /* On entry, 'len' is the length of the udp payload. After the
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230 * initial checks it becomes the size of unprocessed options,
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231 * while 'data' is advanced accordingly.
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233 if (len < sizeof(struct stun_header)) {
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234 fprintf(stderr, "Runt STUN packet (only %d, wanting at least %d)\n", (int) len, (int) sizeof(struct stun_header));
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237 len -= sizeof(struct stun_header);
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238 data += sizeof(struct stun_header);
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239 x = ntohs(hdr->msglen); /* len as advertised in the message */
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241 fprintf(stderr, "STUN Packet, msg %s (%04x), length: %d\n", stun_msg2str(ntohs(hdr->msgtype)), ntohs(hdr->msgtype), x);
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243 fprintf(stderr, "Scrambled STUN packet length (got %d, expecting %d)\n", x, (int)len);
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246 memset(&st,0, sizeof(st));
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249 if (len < sizeof(struct stun_attr)) {
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250 fprintf(stderr, "Runt Attribute (got %d, expecting %d)\n", (int)len, (int) sizeof(struct stun_attr));
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253 attr = (struct stun_attr *)data;
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255 /* compute total attribute length */
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256 x = ntohs(attr->len) + sizeof(struct stun_attr);
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258 fprintf(stderr, "Inconsistent Attribute (length %d exceeds remaining msg len %d)\n", x, (int)len);
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262 stun_cb(&st, attr, arg, hdr->magic);
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263 if (stun_process_attr(&st, attr)) {
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264 fprintf(stderr, "Failed to handle attribute %s (%04x)\n", stun_attr2str(ntohs(attr->attr)), ntohs(attr->attr));
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267 /* Clear attribute id: in case previous entry was a string,
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268 * this will act as the terminator for the string.
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274 /* Null terminate any string.
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275 * XXX NOTE, we write past the size of the buffer passed by the
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276 * caller, so this is potentially dangerous. The only thing that
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277 * saves us is that usually we read the incoming message in a
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278 * much larger buffer
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285 /* Extract the STUN_MAPPED_ADDRESS from the stun response.
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286 * This is used as a callback for stun_handle_response
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287 * when called from stun_request.
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289 static int stun_get_mapped(struct stun_state *st, struct stun_attr *attr, void *arg, unsigned int magic)
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291 struct stun_addr *returned_addr = (struct stun_addr *)(attr + 1);
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292 struct sockaddr_in *sa = (struct sockaddr_in *)arg;
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293 unsigned short type = ntohs(attr->attr);
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296 case STUN_MAPPED_ADDRESS:
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297 if (st->attr == STUN_XOR_MAPPED_ADDRESS ||
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298 st->attr == STUN_MS_XOR_MAPPED_ADDRESS)
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302 case STUN_MS_XOR_MAPPED_ADDRESS:
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303 if (st->attr == STUN_XOR_MAPPED_ADDRESS)
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306 case STUN_XOR_MAPPED_ADDRESS:
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311 if (ntohs(attr->len) < 8 && returned_addr->family != 1)
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315 sa->sin_port = returned_addr->port ^ htons(ntohl(magic) >> 16);
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316 sa->sin_addr.s_addr = returned_addr->addr ^ magic;
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320 /* Generic STUN request
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321 * Send a generic stun request to the server specified,
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322 * possibly waiting for a reply and filling the 'reply' field with
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323 * the externally visible address.
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325 * \param s the socket used to send the request
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326 * \return 0 on success, other values on error.
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328 int stun_request(struct GNUNET_NETWORK_Handle * sock)
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330 struct stun_header *req;
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331 unsigned char reqdata[1024];
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332 int reqlen, reqleft;
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333 struct stun_attr *attr;
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338 struct sockaddr_in server;
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339 struct hostent *hostinfo = gethostbyname(stun_server);
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341 fprintf(stderr, "Error resolving host %s\n", stun_server);
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344 memset(&server,0, sizeof(server));
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345 server.sin_family = AF_INET;
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346 server.sin_addr = *(struct in_addr*) hostinfo->h_addr;
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347 server.sin_port = htons(stun_port);
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351 req = (struct stun_header *)reqdata;
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354 reqleft = sizeof(reqdata) - sizeof(struct stun_header);
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357 attr = (struct stun_attr *)req->ies;
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359 append_attr_string(&attr, STUN_SOFTWARE, PACKAGE " v" VERSION_PACKAGE, &reqlen, &reqleft);
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360 req->msglen = htons(reqlen);
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361 req->msgtype = htons(stun_msg2type(STUN_REQUEST, STUN_BINDING));
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364 if (-1 == GNUNET_NETWORK_socket_sendto (sock, req, ntohs(req->msglen) + sizeof(*req),
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365 (const struct sockaddr *) &server, sizeof (server)))
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367 GNUNET_log_strerror (GNUNET_ERROR_TYPE_WARNING, "sendto");
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373 static void print_answer(struct sockaddr_in* answer)
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375 printf("External IP is: %s , with port %d\n", inet_ntoa(answer->sin_addr), ntohs(answer->sin_port));
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380 * Activity on our incoming socket. Read data from the
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381 * incoming connection.
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384 * @param tc scheduler context
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387 do_udp_read (void *cls,
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388 const struct GNUNET_SCHEDULER_TaskContext *tc)
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390 //struct GNUNET_NAT_Test *tst = cls;
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391 unsigned char reply_buf[1024];
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393 struct sockaddr_in answer;
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396 if ((0 != (tc->reason & GNUNET_SCHEDULER_REASON_READ_READY)) &&
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397 (GNUNET_NETWORK_fdset_isset (tc->read_ready,
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400 rlen = GNUNET_NETWORK_socket_recv (lsock4, reply_buf, sizeof (reply_buf));
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401 printf("Recivied something of size %d", rlen);
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403 //Lets handle the packet
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404 memset(&answer, 0, sizeof(struct sockaddr_in));
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405 stun_handle_packet(reply_buf, rlen, stun_get_mapped, &answer);
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407 //TODO: Delete the object
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409 print_answer(&answer);
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417 * Create an IPv4 listen socket bound to our port.
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419 * @return NULL on error
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421 static struct GNUNET_NETWORK_Handle *
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424 struct GNUNET_NETWORK_Handle *ls;
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425 struct sockaddr_in sa4;
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428 memset (&sa4, 0, sizeof (sa4));
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429 sa4.sin_family = AF_INET;
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430 sa4.sin_port = htons (port);
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431 #if HAVE_SOCKADDR_IN_SIN_LEN
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432 sa4.sin_len = sizeof (sa4);
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434 ls = GNUNET_NETWORK_socket_create (AF_INET,
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440 GNUNET_NETWORK_socket_bind (ls, (const struct sockaddr *) &sa4,
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444 GNUNET_NETWORK_socket_close (ls);
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454 * Main function run with scheduler.
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459 run (void *cls, char *const *args, const char *cfgfile,
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460 const struct GNUNET_CONFIGURATION_Handle *cfg)
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464 //Lets create the socket
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465 lsock4 = bind_v4 ();
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466 if (NULL == lsock4)
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468 GNUNET_log_strerror (GNUNET_ERROR_TYPE_ERROR, "bind");
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472 printf("Binded, now will call add_read\n");
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473 //Lets call our function now when it accepts
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474 ltask4 = GNUNET_SCHEDULER_add_read_net (GNUNET_TIME_UNIT_FOREVER_REL,
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475 lsock4, &do_udp_read, NULL);
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478 if(NULL == lsock4 )
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480 GNUNET_SCHEDULER_shutdown ();
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483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
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484 "Service listens on port %u\n",
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486 printf("Start main event\n");
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487 stun_request(lsock4);
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489 //main_task = GNUNET_SCHEDULER_add_delayed (timeout, &do_timeout, nh);
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495 main (int argc, char *const argv[])
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497 struct GNUNET_GETOPT_CommandLineOption options[] = {
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498 GNUNET_GETOPT_OPTION_END
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501 char *const argv_prog[] = {
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505 GNUNET_log_setup ("test-stun",
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509 GNUNET_PROGRAM_run (1, argv_prog, "test-stun", "nohelp", options, &run, NULL);
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514 /* end of test_nat.c */
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