1 |
/* |
/* -*- c-basic-offset: 8 -*- |
2 |
rdesktop: A Remote Desktop Protocol client. |
rdesktop: A Remote Desktop Protocol client. |
3 |
Protocol services - TCP layer |
Protocol services - TCP layer |
4 |
Copyright (C) Matthew Chapman 1999-2000 |
Copyright (C) Matthew Chapman 1999-2007 |
5 |
|
|
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This program is free software; you can redistribute it and/or modify |
This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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 |
the Free Software Foundation; either version 2 of the License, or |
9 |
(at your option) any later version. |
(at your option) any later version. |
10 |
|
|
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This program is distributed in the hope that it will be useful, |
This program is distributed in the hope that it will be useful, |
12 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
GNU General Public License for more details. |
15 |
|
|
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You should have received a copy of the GNU General Public License |
You should have received a copy of the GNU General Public License |
17 |
along with this program; if not, write to the Free Software |
along with this program; if not, write to the Free Software |
18 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
19 |
*/ |
*/ |
20 |
|
|
21 |
#include "includes.h" |
#ifndef _WIN32 |
22 |
|
#include <unistd.h> /* select read write close */ |
23 |
/* Establish a connection on the TCP layer */ |
#include <sys/socket.h> /* socket connect setsockopt */ |
24 |
HCONN tcp_connect(char *server) |
#include <sys/time.h> /* timeval */ |
25 |
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#include <netdb.h> /* gethostbyname */ |
26 |
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#include <netinet/in.h> /* sockaddr_in */ |
27 |
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#include <netinet/tcp.h> /* TCP_NODELAY */ |
28 |
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#include <arpa/inet.h> /* inet_addr */ |
29 |
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#include <errno.h> /* errno */ |
30 |
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#endif |
31 |
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32 |
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#include "rdesktop.h" |
33 |
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34 |
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#ifdef _WIN32 |
35 |
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#define socklen_t int |
36 |
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#define TCP_CLOSE(_sck) closesocket(_sck) |
37 |
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#define TCP_STRERROR "tcp error" |
38 |
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#define TCP_BLOCKS (WSAGetLastError() == WSAEWOULDBLOCK) |
39 |
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#else |
40 |
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#define TCP_CLOSE(_sck) close(_sck) |
41 |
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#define TCP_STRERROR strerror(errno) |
42 |
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#define TCP_BLOCKS (errno == EWOULDBLOCK) |
43 |
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#endif |
44 |
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|
45 |
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#ifndef INADDR_NONE |
46 |
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#define INADDR_NONE ((unsigned long) -1) |
47 |
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#endif |
48 |
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|
49 |
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static int g_sock; |
50 |
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static struct stream g_in; |
51 |
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#ifndef WITH_SCARD |
52 |
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static struct stream g_out; |
53 |
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#endif |
54 |
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int g_tcp_port_rdp = TCP_PORT_RDP; |
55 |
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|
56 |
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/* wait till socket is ready to write or timeout */ |
57 |
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static BOOL |
58 |
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tcp_can_send(int sck, int millis) |
59 |
{ |
{ |
60 |
struct hostent *nslookup; |
fd_set wfds; |
61 |
struct sockaddr_in servaddr; |
struct timeval time; |
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struct connection *conn; |
int sel_count; |
63 |
int sock; |
|
64 |
int true = 1; |
time.tv_sec = millis / 1000; |
65 |
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time.tv_usec = (millis * 1000) % 1000000; |
66 |
if ((nslookup = gethostbyname(server)) != NULL) |
FD_ZERO(&wfds); |
67 |
{ |
FD_SET(sck, &wfds); |
68 |
memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr)); |
sel_count = select(sck + 1, 0, &wfds, 0, &time); |
69 |
} |
if (sel_count > 0) |
|
else if (!inet_aton(server, &servaddr.sin_addr)) |
|
70 |
{ |
{ |
71 |
fprintf(stderr, "%s: unable to resolve host\n", server); |
return True; |
|
return NULL; |
|
72 |
} |
} |
73 |
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return False; |
74 |
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} |
75 |
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|
76 |
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) |
/* Initialise TCP transport data packet */ |
77 |
{ |
STREAM |
78 |
fprintf(stderr, "socket: %s\n", strerror(errno)); |
tcp_init(uint32 maxlen) |
79 |
return NULL; |
{ |
80 |
} |
STREAM result = NULL; |
81 |
|
|
82 |
servaddr.sin_family = AF_INET; |
#ifdef WITH_SCARD |
83 |
servaddr.sin_port = htons(TCP_PORT_RDP); |
scard_lock(SCARD_LOCK_TCP); |
84 |
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result = scard_tcp_init(); |
85 |
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#else |
86 |
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result = &g_out; |
87 |
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#endif |
88 |
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|
89 |
if (connect(sock, (struct sockaddr *)&servaddr, sizeof(struct sockaddr)) < 0) |
if (maxlen > result->size) |
90 |
{ |
{ |
91 |
fprintf(stderr, "connect: %s\n", strerror(errno)); |
result->data = (uint8 *) xrealloc(result->data, maxlen); |
92 |
close(sock); |
result->size = maxlen; |
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return NULL; |
|
93 |
} |
} |
94 |
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|
95 |
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &true, sizeof(true)); |
result->p = result->data; |
96 |
|
result->end = result->data + result->size; |
97 |
conn = xmalloc(sizeof(struct connection)); |
#ifdef WITH_SCARD |
98 |
STREAM_INIT(conn->in, False); |
scard_unlock(SCARD_LOCK_TCP); |
99 |
STREAM_INIT(conn->out, True); |
#endif |
100 |
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return result; |
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conn->tcp_socket = sock; |
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return conn; |
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} |
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/* Disconnect on the TCP layer */ |
|
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void tcp_disconnect(HCONN conn) |
|
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{ |
|
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close(conn->tcp_socket); |
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free(conn); |
|
101 |
} |
} |
102 |
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|
103 |
/* Send TCP transport data packet */ |
/* Send TCP transport data packet */ |
104 |
BOOL tcp_send(HCONN conn) |
void |
105 |
|
tcp_send(STREAM s) |
106 |
{ |
{ |
107 |
int length = conn->out.end; |
int length = s->end - s->data; |
108 |
int sent, total = 0; |
int sent, total = 0; |
109 |
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|
110 |
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#ifdef WITH_SCARD |
111 |
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scard_lock(SCARD_LOCK_TCP); |
112 |
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#endif |
113 |
while (total < length) |
while (total < length) |
114 |
{ |
{ |
115 |
sent = write(conn->tcp_socket, conn->out.data + total, |
sent = send(g_sock, s->data + total, length - total, 0); |
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length - total); |
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|
116 |
if (sent <= 0) |
if (sent <= 0) |
117 |
{ |
{ |
118 |
fprintf(stderr, "write: %s\n", strerror(errno)); |
if (sent == -1 && TCP_BLOCKS) |
119 |
return False; |
{ |
120 |
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tcp_can_send(g_sock, 100); |
121 |
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sent = 0; |
122 |
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} |
123 |
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else |
124 |
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{ |
125 |
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error("send: %s\n", TCP_STRERROR); |
126 |
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return; |
127 |
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} |
128 |
} |
} |
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|
129 |
total += sent; |
total += sent; |
130 |
} |
} |
131 |
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#ifdef WITH_SCARD |
132 |
conn->out.offset = 0; |
scard_unlock(SCARD_LOCK_TCP); |
133 |
conn->out.end = conn->out.size; |
#endif |
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return True; |
|
134 |
} |
} |
135 |
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|
136 |
/* Receive a message on the TCP layer */ |
/* Receive a message on the TCP layer */ |
137 |
BOOL tcp_recv(HCONN conn, int length) |
STREAM |
138 |
|
tcp_recv(STREAM s, uint32 length) |
139 |
{ |
{ |
140 |
int rcvd; |
uint32 new_length, end_offset, p_offset; |
141 |
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int rcvd = 0; |
142 |
|
|
143 |
STREAM_SIZE(conn->in, length); |
if (s == NULL) |
144 |
conn->in.end = conn->in.offset = 0; |
{ |
145 |
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/* read into "new" stream */ |
146 |
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if (length > g_in.size) |
147 |
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{ |
148 |
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g_in.data = (uint8 *) xrealloc(g_in.data, length); |
149 |
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g_in.size = length; |
150 |
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} |
151 |
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g_in.end = g_in.p = g_in.data; |
152 |
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s = &g_in; |
153 |
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} |
154 |
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else |
155 |
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{ |
156 |
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/* append to existing stream */ |
157 |
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new_length = (s->end - s->data) + length; |
158 |
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if (new_length > s->size) |
159 |
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{ |
160 |
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p_offset = s->p - s->data; |
161 |
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end_offset = s->end - s->data; |
162 |
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s->data = (uint8 *) xrealloc(s->data, new_length); |
163 |
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s->size = new_length; |
164 |
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s->p = s->data + p_offset; |
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s->end = s->data + end_offset; |
166 |
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} |
167 |
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} |
168 |
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|
169 |
while (length > 0) |
while (length > 0) |
170 |
{ |
{ |
171 |
rcvd = read(conn->tcp_socket, conn->in.data + conn->in.end, |
if (!ui_select(g_sock)) |
172 |
length); |
/* User quit */ |
173 |
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return NULL; |
174 |
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|
175 |
if (rcvd <= 0) |
rcvd = recv(g_sock, s->end, length, 0); |
176 |
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if (rcvd < 0) |
177 |
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{ |
178 |
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if (rcvd == -1 && TCP_BLOCKS) |
179 |
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{ |
180 |
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rcvd = 0; |
181 |
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} |
182 |
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else |
183 |
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{ |
184 |
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error("recv: %s\n", TCP_STRERROR); |
185 |
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return NULL; |
186 |
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} |
187 |
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} |
188 |
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else if (rcvd == 0) |
189 |
{ |
{ |
190 |
fprintf(stderr, "read: %s\n", strerror(errno)); |
error("Connection closed\n"); |
191 |
return False; |
return NULL; |
192 |
} |
} |
193 |
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|
194 |
conn->in.end += rcvd; |
s->end += rcvd; |
195 |
length -= rcvd; |
length -= rcvd; |
196 |
} |
} |
197 |
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|
198 |
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return s; |
199 |
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} |
200 |
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|
201 |
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/* Establish a connection on the TCP layer */ |
202 |
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BOOL |
203 |
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tcp_connect(char *server) |
204 |
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{ |
205 |
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socklen_t option_len; |
206 |
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uint32 option_value; |
207 |
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|
208 |
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#ifdef IPv6 |
209 |
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|
210 |
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int n; |
211 |
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struct addrinfo hints, *res, *ressave; |
212 |
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char tcp_port_rdp_s[10]; |
213 |
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|
214 |
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snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp); |
215 |
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|
216 |
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memset(&hints, 0, sizeof(struct addrinfo)); |
217 |
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hints.ai_family = AF_UNSPEC; |
218 |
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hints.ai_socktype = SOCK_STREAM; |
219 |
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|
220 |
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if ((n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res))) |
221 |
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{ |
222 |
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error("getaddrinfo: %s\n", gai_strerror(n)); |
223 |
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return False; |
224 |
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} |
225 |
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|
226 |
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ressave = res; |
227 |
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g_sock = -1; |
228 |
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while (res) |
229 |
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{ |
230 |
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g_sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); |
231 |
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if (!(g_sock < 0)) |
232 |
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{ |
233 |
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if (connect(g_sock, res->ai_addr, res->ai_addrlen) == 0) |
234 |
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break; |
235 |
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TCP_CLOSE(g_sock); |
236 |
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g_sock = -1; |
237 |
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} |
238 |
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res = res->ai_next; |
239 |
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} |
240 |
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freeaddrinfo(ressave); |
241 |
|
|
242 |
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if (g_sock == -1) |
243 |
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{ |
244 |
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error("%s: unable to connect\n", server); |
245 |
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return False; |
246 |
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} |
247 |
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|
248 |
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#else /* no IPv6 support */ |
249 |
|
|
250 |
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struct hostent *nslookup; |
251 |
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struct sockaddr_in servaddr; |
252 |
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|
253 |
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if ((nslookup = gethostbyname(server)) != NULL) |
254 |
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{ |
255 |
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memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr)); |
256 |
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} |
257 |
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else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE) |
258 |
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{ |
259 |
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error("%s: unable to resolve host\n", server); |
260 |
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return False; |
261 |
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} |
262 |
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|
263 |
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if ((g_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) |
264 |
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{ |
265 |
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error("socket: %s\n", TCP_STRERROR); |
266 |
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return False; |
267 |
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} |
268 |
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|
269 |
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servaddr.sin_family = AF_INET; |
270 |
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servaddr.sin_port = htons((uint16) g_tcp_port_rdp); |
271 |
|
|
272 |
|
if (connect(g_sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0) |
273 |
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{ |
274 |
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error("connect: %s\n", TCP_STRERROR); |
275 |
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TCP_CLOSE(g_sock); |
276 |
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return False; |
277 |
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} |
278 |
|
|
279 |
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#endif /* IPv6 */ |
280 |
|
|
281 |
|
option_value = 1; |
282 |
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option_len = sizeof(option_value); |
283 |
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setsockopt(g_sock, IPPROTO_TCP, TCP_NODELAY, (void *) &option_value, option_len); |
284 |
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/* receive buffer must be a least 16 K */ |
285 |
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if (getsockopt(g_sock, SOL_SOCKET, SO_RCVBUF, (void *) &option_value, &option_len) == 0) |
286 |
|
{ |
287 |
|
if (option_value < (1024 * 16)) |
288 |
|
{ |
289 |
|
option_value = 1024 * 16; |
290 |
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option_len = sizeof(option_value); |
291 |
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setsockopt(g_sock, SOL_SOCKET, SO_RCVBUF, (void *) &option_value, |
292 |
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option_len); |
293 |
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} |
294 |
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} |
295 |
|
|
296 |
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g_in.size = 4096; |
297 |
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g_in.data = (uint8 *) xmalloc(g_in.size); |
298 |
|
|
299 |
|
#ifdef WITH_SCARD |
300 |
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scard_tcp_connect(); |
301 |
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#else |
302 |
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g_out.size = 4096; |
303 |
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g_out.data = (uint8 *) xmalloc(g_out.size); |
304 |
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#endif |
305 |
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|
306 |
return True; |
return True; |
307 |
} |
} |
308 |
|
|
309 |
|
/* Disconnect on the TCP layer */ |
310 |
|
void |
311 |
|
tcp_disconnect(void) |
312 |
|
{ |
313 |
|
TCP_CLOSE(g_sock); |
314 |
|
} |
315 |
|
|
316 |
|
char * |
317 |
|
tcp_get_address() |
318 |
|
{ |
319 |
|
static char ipaddr[32]; |
320 |
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struct sockaddr_in sockaddr; |
321 |
|
socklen_t len = sizeof(sockaddr); |
322 |
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if (getsockname(g_sock, (struct sockaddr *) &sockaddr, &len) == 0) |
323 |
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{ |
324 |
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uint8 *ip = (uint8 *) & sockaddr.sin_addr; |
325 |
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sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]); |
326 |
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} |
327 |
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else |
328 |
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strcpy(ipaddr, "127.0.0.1"); |
329 |
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return ipaddr; |
330 |
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} |
331 |
|
|
332 |
|
/* reset the state of the tcp layer */ |
333 |
|
/* Support for Session Directory */ |
334 |
|
void |
335 |
|
tcp_reset_state(void) |
336 |
|
{ |
337 |
|
g_sock = -1; /* reset socket */ |
338 |
|
|
339 |
|
/* Clear the incoming stream */ |
340 |
|
if (g_in.data != NULL) |
341 |
|
xfree(g_in.data); |
342 |
|
g_in.p = NULL; |
343 |
|
g_in.end = NULL; |
344 |
|
g_in.data = NULL; |
345 |
|
g_in.size = 0; |
346 |
|
g_in.iso_hdr = NULL; |
347 |
|
g_in.mcs_hdr = NULL; |
348 |
|
g_in.sec_hdr = NULL; |
349 |
|
g_in.rdp_hdr = NULL; |
350 |
|
g_in.channel_hdr = NULL; |
351 |
|
|
352 |
|
/* Clear the outgoing stream(s) */ |
353 |
|
#ifdef WITH_SCARD |
354 |
|
scard_tcp_reset_state(); |
355 |
|
#else |
356 |
|
if (g_out.data != NULL) |
357 |
|
xfree(g_out.data); |
358 |
|
g_out.p = NULL; |
359 |
|
g_out.end = NULL; |
360 |
|
g_out.data = NULL; |
361 |
|
g_out.size = 0; |
362 |
|
g_out.iso_hdr = NULL; |
363 |
|
g_out.mcs_hdr = NULL; |
364 |
|
g_out.sec_hdr = NULL; |
365 |
|
g_out.rdp_hdr = NULL; |
366 |
|
g_out.channel_hdr = NULL; |
367 |
|
#endif |
368 |
|
} |