File: natpmpc.c

package info (click to toggle)
libnatpmp 20150609-7
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 300 kB
  • sloc: ansic: 1,430; java: 312; makefile: 150; python: 23
file content (244 lines) | stat: -rw-r--r-- 7,398 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/* $Id: natpmpc.c,v 1.13 2012/08/21 17:23:38 nanard Exp $ */
/* libnatpmp
Copyright (c) 2007-2011, Thomas BERNARD
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * The name of the author may not be used to endorse or promote products
	  derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <errno.h>
#include <string.h>
#if defined(_MSC_VER)
#if _MSC_VER >= 1400
#define strcasecmp _stricmp
#else
#define strcasecmp stricmp
#endif
#else
#include <unistd.h>
#endif
#ifdef WIN32
#include <winsock2.h>
#else
#include <netinet/in.h>
#include <arpa/inet.h>
#endif
#include "natpmp.h"

void usage(FILE * out, const char * argv0)
{
	fprintf(out, "Usage :\n");
	fprintf(out, "  %s [options]\n", argv0);
	fprintf(out, "\tdisplay the public IP address.\n");
	fprintf(out, "  %s -h\n", argv0);
	fprintf(out, "\tdisplay this help screen.\n");
	fprintf(out, "  %s [options] -a <public port> <private port> <protocol> [lifetime]\n", argv0);
	fprintf(out, "\tadd a port mapping.\n");
	fprintf(out, "\nOption available :\n");
	fprintf(out, "  -g ipv4address\n");
	fprintf(out, "\tforce the gateway to be used as destination for NAT-PMP commands.\n");
	fprintf(out, "\n  In order to remove a mapping, set it with a lifetime of 0 seconds.\n");
	fprintf(out, "  To remove all mappings for your machine, use 0 as private port and lifetime.\n");
}

/* sample code for using libnatpmp */
int main(int argc, char * * argv)
{
	natpmp_t natpmp;
	natpmpresp_t response;
	int r;
	int sav_errno;
	struct timeval timeout;
	fd_set fds;
	int i;
	int protocol = 0;
	uint16_t privateport = 0;
	uint16_t publicport = 0;
	uint32_t lifetime = 3600;
	int command = 0;
	int forcegw = 0;
	in_addr_t gateway = 0;
	struct in_addr gateway_in_use;

#ifdef WIN32
	WSADATA wsaData;
	int nResult = WSAStartup(MAKEWORD(2,2), &wsaData);
	if(nResult != NO_ERROR)
	{
		fprintf(stderr, "WSAStartup() failed.\n");
		return -1;
	}
#endif

	/* argument parsing */
	for(i=1; i<argc; i++) {
		if(argv[i][0] == '-') {
			switch(argv[i][1]) {
			case 'h':
				usage(stdout, argv[0]);
				return 0;
			case 'g':
				forcegw = 1;
				if(argc < i + 1) {
					fprintf(stderr, "Not enough arguments for option -%c\n", argv[i][1]);
					return 1;
				}
				gateway = inet_addr(argv[++i]);
				break;
			case 'a':
				command = 'a';
				if(argc < i + 4) {
					fprintf(stderr, "Not enough arguments for option -%c\n", argv[i][1]);
					return 1;
				}
				i++;
				if(1 != sscanf(argv[i], "%hu", &publicport)) {
					fprintf(stderr, "%s is not a correct 16bits unsigned integer\n", argv[i]);
					return 1;
				}
				i++;
				if(1 != sscanf(argv[i], "%hu", &privateport)) {
					fprintf(stderr, "%s is not a correct 16bits unsigned integer\n", argv[i]);
					return 1;
				}
				i++;
				if(0 == strcasecmp(argv[i], "tcp"))
					protocol = NATPMP_PROTOCOL_TCP;
				else if(0 == strcasecmp(argv[i], "udp"))
					protocol = NATPMP_PROTOCOL_UDP;
				else {
					fprintf(stderr, "%s is not a valid protocol\n", argv[i]);
					return 1;
				}
				if(argc > i + 1) {
					if(1 != sscanf(argv[i+1], "%u", &lifetime)) {
						fprintf(stderr, "%s is not a correct 32bits unsigned integer\n", argv[i]);
					} else {
						i++;
					}
				}
				break;
			default:
				fprintf(stderr, "Unknown option %s\n", argv[i]);
				usage(stderr, argv[0]);
				return 1;
			}
		} else {
			fprintf(stderr, "Unknown option %s\n", argv[i]);
			usage(stderr, argv[0]);
			return 1;
		}
	}

	/* initnatpmp() */
	r = initnatpmp(&natpmp, forcegw, gateway);
	printf("initnatpmp() returned %d (%s)\n", r, r?"FAILED":"SUCCESS");
	if(r<0)
		return 1;

	gateway_in_use.s_addr = natpmp.gateway;
	printf("using gateway : %s\n", inet_ntoa(gateway_in_use));

	/* sendpublicaddressrequest() */
	r = sendpublicaddressrequest(&natpmp);
	printf("sendpublicaddressrequest returned %d (%s)\n",
	       r, r==2?"SUCCESS":"FAILED");
	if(r<0)
		return 1;

	do {
		FD_ZERO(&fds);
		FD_SET(natpmp.s, &fds);
		getnatpmprequesttimeout(&natpmp, &timeout);
		r = select(FD_SETSIZE, &fds, NULL, NULL, &timeout);
		if(r<0) {
			fprintf(stderr, "select()");
			return 1;
		}
		r = readnatpmpresponseorretry(&natpmp, &response);
		sav_errno = errno;
		printf("readnatpmpresponseorretry returned %d (%s)\n",
		       r, r==0?"OK":(r==NATPMP_TRYAGAIN?"TRY AGAIN":"FAILED"));
		if(r<0 && r!=NATPMP_TRYAGAIN) {
#ifdef ENABLE_STRNATPMPERR
			fprintf(stderr, "readnatpmpresponseorretry() failed : %s\n",
			        strnatpmperr(r));
#endif
			fprintf(stderr, "  errno=%d '%s'\n",
			        sav_errno, strerror(sav_errno));
		}
	} while(r==NATPMP_TRYAGAIN);
	if(r<0)
		return 1;

	/* TODO : check that response.type == 0 */
	printf("Public IP address : %s\n", inet_ntoa(response.pnu.publicaddress.addr));
	printf("epoch = %u\n", response.epoch);

	if(command == 'a') {
		/* sendnewportmappingrequest() */
		r = sendnewportmappingrequest(&natpmp, protocol,
        	                      privateport, publicport,
								  lifetime);
		printf("sendnewportmappingrequest returned %d (%s)\n",
		       r, r==12?"SUCCESS":"FAILED");
		if(r < 0)
			return 1;

		do {
			FD_ZERO(&fds);
			FD_SET(natpmp.s, &fds);
			getnatpmprequesttimeout(&natpmp, &timeout);
			select(FD_SETSIZE, &fds, NULL, NULL, &timeout);
			r = readnatpmpresponseorretry(&natpmp, &response);
			printf("readnatpmpresponseorretry returned %d (%s)\n",
			       r, r==0?"OK":(r==NATPMP_TRYAGAIN?"TRY AGAIN":"FAILED"));
		} while(r==NATPMP_TRYAGAIN);
		if(r<0) {
#ifdef ENABLE_STRNATPMPERR
			fprintf(stderr, "readnatpmpresponseorretry() failed : %s\n",
			        strnatpmperr(r));
#endif
			return 1;
		}

		printf("Mapped public port %hu protocol %s to local port %hu "
		       "liftime %u\n",
	    	   response.pnu.newportmapping.mappedpublicport,
			   response.type == NATPMP_RESPTYPE_UDPPORTMAPPING ? "UDP" :
			    (response.type == NATPMP_RESPTYPE_TCPPORTMAPPING ? "TCP" :
			     "UNKNOWN"),
			   response.pnu.newportmapping.privateport,
			   response.pnu.newportmapping.lifetime);
		printf("epoch = %u\n", response.epoch);
	}

	r = closenatpmp(&natpmp);
	printf("closenatpmp() returned %d (%s)\n", r, r==0?"SUCCESS":"FAILED");
	if(r<0)
		return 1;

	return 0;
}