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
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
/*
 *  Copyright (c) 2005 Ian McDonald <[email protected]>
 *
 *  This program 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 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "common.hpp"

void* dostuff(void*);

void* dostuff(void* sock) {
	int sockfd;
	memcpy(&sockfd,sock,sizeof(sockfd));

	ssize_t n;
	char * buf = (char*) calloc(MAXLINE, sizeof(char));
	int64_t readChars = 0;
	int64_t unitsize = 0;
	int64_t toTransfer = fileSize;
	int rsize, rs;

	fstream* fs;
	fs = new fstream(default_dest_path.c_str(), ios::out | ios::in | ios::binary | ios::trunc);
	
	int mtu_size = 256;
	socklen_t sizeMTU = (socklen_t) sizeof(mtu_size);

    if (default_proto == DCCP) {
      	getsockopt(sockfd, SOL_DCCP, DCCP_SOCKOPT_GET_CUR_MPS,(socklen_t*) &mtu_size, &sizeMTU);
	}

	while (toTransfer > 0) {
		rs = 0;
		rsize = 0;
		
		if (default_proto == DCCP && mtu_size < MAXLINE) {
			unitsize = ((toTransfer >= mtu_size) ? mtu_size : toTransfer);
		}
		else {
			unitsize = ((toTransfer >= MAXLINE) ? MAXLINE : toTransfer);
		}

		while (rsize < unitsize) {
			switch (default_proto) {
				case TCP:
					rs = recv(sockfd, buf + rsize, unitsize - rsize, 0);
					break;
				case DCCP:
					do {
						rs = recv(sockfd, buf + rsize, unitsize - rsize, 0);
					} while(rs <= 0 && errno == EAGAIN);
					break;

				case UDP:
					rs = recv(sockfd, buf + rsize, unitsize - rsize, 0);
					break;

				case PUDT:
					rs = UDT::recv(sockfd, buf + rsize, unitsize - rsize, 0);
					break;

			}

			if (rs < 0) {
				break;
			}

			rsize += rs;
		}

		fs->write(buf, unitsize);

		toTransfer -= unitsize;
	}

	fs->flush();
	fs->close();
	delete (fs);
	free(buf);

	if (n < 0)
		printerrno("dostuff");
}

int main(int argc, char **argv) {
	int listenfd, connfd;
	struct sockaddr_in servaddr, cliaddr;
	socklen_t clilen;
	string test;
	pid_t childpid;
	string protoName;

	int ind = 1;
	while (ind < argc) {
		switch (argv[ind][1]) {
			// protocol
			case 'P':
				protoName = string(argv[++ind]);
				if (strcmp(protoName.c_str(),"TCP")==0) {
					default_proto = TCP;
				} else if (strcmp(protoName.c_str(),"DCCP")==0) {
					default_proto = DCCP;
				} else if (strcmp(protoName.c_str(),"UDP")==0) {
					default_proto = UDP;
				} else if (strcmp(protoName.c_str(),"UDT")==0) {
					default_proto = PUDT;
				} else {
					goto usage;
				}
				break;

			// port
			case 'p':
				port = string(argv[++ind]);
				break;

			// destination path
			case 'd':
				default_dest_path = string(argv[++ind]);
				break;

			// help
			case 'h':
				goto usage;
				break;

			default:
				goto usage;
				break;
		}

		ind++;
	}

	cout << "Using protocol " << usedProto(default_proto).c_str() << endl;
	cout << "Listen on port " << port.c_str() << endl;
	cout << "Saving file under file name " << default_dest_path.c_str() << endl;

	if (default_proto == PUDT) {
		UDT::startup();
	}

	if ((listenfd = make_socket()) < 0) {
		printerrno("socket");
		return 1;
	}

	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(str_to_int(port));

	if (default_proto != PUDT) {
		bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
	}
	else {
		 if (UDT::ERROR == UDT::bind(listenfd, (struct sockaddr *)&servaddr, sizeof(servaddr))) {
		      cout << "bind: " << UDT::getlasterror().getErrorMessage() << endl;
		      return 0;
		   }
	}

	if (errno) {
		printerrno("bind");
		return 1;
	}
	
	socket_options(listenfd);
	if (errno) {
		printerrno("socket_options");
		return 1;
	}

	if (default_proto != UDP) {

#ifdef DCCP_SOCKOPT_CCID
		if (default_proto == DCCP) {
			int ccid = 3;
			setsockopt(listenfd, SOL_DCCP, DCCP_SOCKOPT_CCID,(uint8_t*) &ccid, sizeof(uint8_t));
			if (errno) {
                                printerrno("SET CCID");
                                return 1;
                        }
			cout << "Using CCID " << ccid << endl;
		} 
#endif

		if (default_proto != PUDT) {
			listen(listenfd, 0);
			if (errno) {
				printerrno("listen");
				return 1;
			}
		}
		else {
			if (UDT::ERROR == UDT::listen(listenfd, 10))
			   {
			      cout << "listen: " << UDT::getlasterror().getErrorMessage() << endl;
			      return 0;
			   }
		}

		while (true) {
			clilen = sizeof(cliaddr);
			if (default_proto != PUDT) {
				if ((connfd = accept(listenfd,(struct sockaddr *)&cliaddr, &clilen)) <0) {
					if (errno == EINTR || errno == EAGAIN)
						continue;
					else
						printerrno("accept");
				}
			}
			else {
				if (UDT::INVALID_SOCK == (connfd = UDT::accept(listenfd,(sockaddr *)&cliaddr, (int*)&clilen)))
			  {
				 cout << "accept: " << UDT::getlasterror().getErrorMessage() << endl;
				 return 0;
			  }
			}

			pthread_t rcvthread;
			pthread_create(&rcvthread, NULL, dostuff, (void *)&connfd);
			pthread_detach(rcvthread);

			if (errno)
				printerrno("close - postfork");
		}
		close(connfd);
	}
	else {
		while(true) {
			pthread_t rcvthread;
			pthread_create(&rcvthread, NULL, dostuff, (void *)&listenfd);
			pthread_detach(rcvthread);
		}
		close(listenfd);
	}

	return 0;
usage:
	cerr << "-P proto defines the protocol to use where proto" << endl;
	cerr << "\t can be TCP, DCCP, UDP or UDT" << endl;
	cerr << "-p port defines the port to connect to" << endl;
	cerr << "-d file the destination file name to write the incoming file" << endl;
	cerr << "-h prints this help and exits" << endl;

	return 1;
}