2 rdesktop: A Remote Desktop Protocol client.
3 Protocol services - TCP layer
4 Copyright (C) Matthew Chapman 1999-2002
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <unistd.h> /* select read write close */
22 #include <sys/socket.h> /* socket connect setsockopt */
23 #include <sys/time.h> /* timeval */
24 #include <netdb.h> /* gethostbyname */
25 #include <netinet/in.h> /* sockaddr_in */
26 #include <netinet/tcp.h> /* TCP_NODELAY */
27 #include <arpa/inet.h> /* inet_addr */
28 #include <errno.h> /* errno */
32 #define INADDR_NONE ((unsigned long) -1)
36 static struct stream in;
37 static struct stream out;
38 extern int tcp_port_rdp;
40 /* Initialise TCP transport data packet */
42 tcp_init(uint32 maxlen)
44 if (maxlen > out.size)
46 out.data = (uint8 *) xrealloc(out.data, maxlen);
51 out.end = out.data + out.size;
55 /* Send TCP transport data packet */
59 int length = s->end - s->data;
62 while (total < length)
64 sent = send(sock, s->data + total, length - total, 0);
67 error("send: %s\n", strerror(errno));
75 /* Receive a message on the TCP layer */
77 tcp_recv(STREAM s, uint32 length)
79 unsigned int new_length, end_offset, p_offset;
84 /* read into "new" stream */
87 in.data = (uint8 *) xrealloc(in.data, length);
90 in.end = in.p = in.data;
95 /* append to existing stream */
96 new_length = (s->end - s->data) + length;
97 if (new_length > s->size)
99 p_offset = s->p - s->data;
100 end_offset = s->end - s->data;
101 s->data = (uint8 *) xrealloc(s->data, new_length);
102 s->size = new_length;
103 s->p = s->data + p_offset;
104 s->end = s->data + end_offset;
111 if (!ui_select(sock))
116 rcvd = recv(sock, s->end, length, 0);
119 error("recv: %s\n", strerror(errno));
124 error("Connection closed\n");
135 /* Establish a connection on the TCP layer */
137 tcp_connect(char *server, int port)
145 struct addrinfo hints, *res, *ressave;
146 char tcp_port_rdp_s[10];
148 snprintf(tcp_port_rdp_s, 10, "%d", tcp_port_rdp);
150 memset(&hints, 0, sizeof(struct addrinfo));
151 hints.ai_family = AF_UNSPEC;
152 hints.ai_socktype = SOCK_STREAM;
154 n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res);
158 error("getaddrinfo: %s\n", gai_strerror(n));
166 sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
169 if (connect(sock, res->ai_addr, res->ai_addrlen) == 0)
176 freeaddrinfo(ressave);
180 error("%s: unable to connect\n", server);
184 #else /* no IPv6 support */
186 struct hostent *nslookup;
187 struct sockaddr_in servaddr;
189 if ((nslookup = gethostbyname(server)) != NULL)
191 memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
193 else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
195 error("%s: unable to resolve host\n", server);
199 if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
201 error("socket: %s\n", strerror(errno));
205 servaddr.sin_family = AF_INET;
206 servaddr.sin_port = htons(port);
208 if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
210 error("connect: %s\n", strerror(errno));
217 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
220 in.data = (uint8 *) xmalloc(in.size);
223 out.data = (uint8 *) xmalloc(out.size);
228 /* Establish a connection on the TCP layer */
230 tcp_recv_connect(int server_sock)
232 struct sockaddr_in sin;
233 unsigned true_value = 1;
234 socklen_t len = sizeof(sin);
235 sock = accept(server_sock, (struct sockaddr *)&sin, &len);
242 setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
245 in.data = (uint8 *) xmalloc(in.size);
248 out.data = (uint8 *) xmalloc(out.size);
253 /* Disconnect on the TCP layer */
261 int tcp_get_socket(void)