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317 lines
6.5 KiB
317 lines
6.5 KiB
/* -*- c-basic-offset: 8 -*-
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rdesktop: A Remote Desktop Protocol client.
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Protocol services - TCP layer
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Copyright (C) Matthew Chapman 1999-2005
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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
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _WIN32
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#include <unistd.h> /* select read write close */
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#include <sys/socket.h> /* socket connect setsockopt */
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#include <sys/time.h> /* timeval */
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#include <netdb.h> /* gethostbyname */
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#include <netinet/in.h> /* sockaddr_in */
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#include <netinet/tcp.h> /* TCP_NODELAY */
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#include <arpa/inet.h> /* inet_addr */
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#include <errno.h> /* errno */
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#endif /* _WIN32 */
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#include "rdesktop.h"
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#ifdef _WIN32
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#define socklen_t int
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#define TCP_CLOSE(_sck) closesocket(_sck)
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#define TCP_STRERROR "tcp error"
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#define TCP_SLEEP(_n) Sleep(_n)
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#define TCP_BLOCKS (WSAGetLastError() == WSAEWOULDBLOCK)
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#else /* _WIN32 */
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#define TCP_CLOSE(_sck) close(_sck)
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#define TCP_STRERROR strerror(errno)
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#define TCP_SLEEP(_n) sleep(_n)
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#define TCP_BLOCKS (errno == EWOULDBLOCK)
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#endif /* _WIN32 */
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#ifndef INADDR_NONE
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#define INADDR_NONE ((unsigned long) -1)
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#endif
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static int sock;
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static struct stream in;
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static struct stream out;
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int g_tcp_port_rdp = TCP_PORT_RDP;
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int g_bytes_in = 0;
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/* Initialise TCP transport data packet */
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STREAM
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tcp_init(uint32 maxlen)
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{
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if (maxlen > out.size)
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{
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out.data = (uint8 *) xrealloc(out.data, maxlen);
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out.size = maxlen;
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}
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out.p = out.data;
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out.end = out.data + out.size;
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return &out;
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}
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/* Send TCP transport data packet */
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void
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tcp_send(STREAM s)
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{
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int length = s->end - s->data;
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int sent, total = 0;
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while (total < length)
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{
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sent = send(sock, s->data + total, length - total, 0);
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if (sent <= 0)
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{
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if (sent == -1 && TCP_BLOCKS)
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{
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TCP_SLEEP(0);
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sent = 0;
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}
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else
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{
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error("send: %s\n", TCP_STRERROR);
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return;
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}
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}
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total += sent;
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}
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}
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/* Receive a message on the TCP layer */
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STREAM
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tcp_recv(STREAM s, uint32 length)
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{
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unsigned int new_length, end_offset, p_offset;
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int rcvd = 0;
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g_bytes_in += length;
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if (s == NULL)
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{
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/* read into "new" stream */
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if (length > in.size)
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{
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in.data = (uint8 *) xrealloc(in.data, length);
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in.size = length;
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}
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in.end = in.p = in.data;
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s = ∈
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}
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else
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{
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/* append to existing stream */
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new_length = (s->end - s->data) + length;
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if (new_length > s->size)
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{
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p_offset = s->p - s->data;
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end_offset = s->end - s->data;
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s->data = (uint8 *) xrealloc(s->data, new_length);
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s->size = new_length;
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s->p = s->data + p_offset;
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s->end = s->data + end_offset;
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}
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}
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while (length > 0)
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{
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if (!ui_select(sock))
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/* User quit */
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return NULL;
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rcvd = recv(sock, s->end, length, 0);
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if (rcvd < 0)
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{
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if (rcvd == -1 && TCP_BLOCKS)
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{
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TCP_SLEEP(0);
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rcvd = 0;
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}
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else
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{
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error("recv: %s\n", TCP_STRERROR);
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return NULL;
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}
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}
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else if (rcvd == 0)
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{
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error("Connection closed\n");
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return NULL;
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}
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s->end += rcvd;
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length -= rcvd;
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}
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return s;
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}
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/* Establish a connection on the TCP layer */
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BOOL
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tcp_connect(char *server)
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{
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int lvalue;
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#ifdef IPv6
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int n;
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struct addrinfo hints, *res, *ressave;
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char tcp_port_rdp_s[10];
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snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp);
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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if ((n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res)))
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{
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error("getaddrinfo: %s\n", gai_strerror(n));
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return False;
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}
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ressave = res;
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sock = -1;
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while (res)
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{
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sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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if (!(sock < 0))
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{
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if (connect(sock, res->ai_addr, res->ai_addrlen) == 0)
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break;
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TCP_CLOSE(sock);
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sock = -1;
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}
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res = res->ai_next;
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}
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freeaddrinfo(ressave);
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if (sock == -1)
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{
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error("%s: unable to connect\n", server);
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return False;
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}
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#else /* no IPv6 support */
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struct hostent *nslookup;
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struct sockaddr_in servaddr;
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if ((nslookup = gethostbyname(server)) != NULL)
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{
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memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
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}
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else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
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{
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error("%s: unable to resolve host\n", server);
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return False;
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}
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if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
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{
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error("socket: %s\n", TCP_STRERROR);
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return False;
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}
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons((uint16) g_tcp_port_rdp);
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if (connect(sock, (struct sockaddr *) &servaddr, sizeof(struct sockaddr)) < 0)
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{
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error("connect: %s\n", TCP_STRERROR);
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TCP_CLOSE(sock);
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return False;
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}
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#endif /* IPv6 */
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//lvalue = 1;
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//setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &lvalue, sizeof(lvalue));
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lvalue = 8192 * 2;
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setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (void *) &lvalue, sizeof(lvalue));
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lvalue = 8192 * 2;
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setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void *) &lvalue, sizeof(lvalue));
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in.size = 8192 * 2;
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in.data = (uint8 *) xmalloc(in.size);
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out.size = 8192 * 2;
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out.data = (uint8 *) xmalloc(out.size);
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return True;
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}
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/* Disconnect on the TCP layer */
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void
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tcp_disconnect(void)
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{
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TCP_CLOSE(sock);
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}
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char *
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tcp_get_address()
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{
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static char ipaddr[32];
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struct sockaddr_in sockaddr;
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socklen_t len = sizeof(sockaddr);
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if (getsockname(sock, (struct sockaddr *) &sockaddr, &len) == 0)
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{
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unsigned char *ip = (unsigned char *) &sockaddr.sin_addr;
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sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
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}
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else
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strcpy(ipaddr, "127.0.0.1");
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return ipaddr;
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}
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/* reset the state of the tcp layer */
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/* Support for Session Directory */
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void
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tcp_reset_state(void)
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{
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sock = -1; /* reset socket */
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/* Clear the incoming stream */
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if (in.data != NULL)
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xfree(in.data);
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in.p = NULL;
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in.end = NULL;
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in.data = NULL;
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in.size = 0;
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in.iso_hdr = NULL;
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in.mcs_hdr = NULL;
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in.sec_hdr = NULL;
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in.rdp_hdr = NULL;
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in.channel_hdr = NULL;
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/* Clear the outgoing stream */
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if (out.data != NULL)
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xfree(out.data);
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out.p = NULL;
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out.end = NULL;
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out.data = NULL;
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out.size = 0;
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out.iso_hdr = NULL;
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out.mcs_hdr = NULL;
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out.sec_hdr = NULL;
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out.rdp_hdr = NULL;
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out.channel_hdr = NULL;
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}
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