xrdp/uirdesktop/tcp.c

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2006-06-21 07:47:18 +04:00
/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Protocol services - TCP layer
Copyright (C) Matthew Chapman 1999-2005
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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.
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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.
*/
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#ifndef _WIN32
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#include <unistd.h> /* select read write close */
#include <sys/socket.h> /* socket connect setsockopt */
#include <sys/time.h> /* timeval */
#include <netdb.h> /* gethostbyname */
#include <netinet/in.h> /* sockaddr_in */
#include <netinet/tcp.h> /* TCP_NODELAY */
#include <arpa/inet.h> /* inet_addr */
#include <errno.h> /* errno */
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#endif /* _WIN32 */
#include "rdesktop.h"
#ifdef _WIN32
#define socklen_t int
#define TCP_CLOSE(_sck) closesocket(_sck)
#define TCP_STRERROR "tcp error"
#define TCP_SLEEP(_n) Sleep(_n)
#define TCP_BLOCKS (WSAGetLastError() == WSAEWOULDBLOCK)
#else /* _WIN32 */
#define TCP_CLOSE(_sck) close(_sck)
#define TCP_STRERROR strerror(errno)
#define TCP_SLEEP(_n) sleep(_n)
#define TCP_BLOCKS (errno == EWOULDBLOCK)
#endif /* _WIN32 */
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#ifndef INADDR_NONE
#define INADDR_NONE ((unsigned long) -1)
#endif
static int sock;
static struct stream in;
static struct stream out;
int g_tcp_port_rdp = TCP_PORT_RDP;
/* Initialise TCP transport data packet */
STREAM
tcp_init(uint32 maxlen)
{
if (maxlen > out.size)
{
out.data = (uint8 *) xrealloc(out.data, maxlen);
out.size = maxlen;
}
out.p = out.data;
out.end = out.data + out.size;
return &out;
}
/* Send TCP transport data packet */
void
tcp_send(STREAM s)
{
int length = s->end - s->data;
int sent, total = 0;
while (total < length)
{
sent = send(sock, s->data + total, length - total, 0);
if (sent <= 0)
{
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if (sent == -1 && TCP_BLOCKS)
{
TCP_SLEEP(0);
sent = 0;
}
else
{
error("send: %s\n", TCP_STRERROR);
return;
}
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}
total += sent;
}
}
/* Receive a message on the TCP layer */
STREAM
tcp_recv(STREAM s, uint32 length)
{
unsigned int new_length, end_offset, p_offset;
int rcvd = 0;
if (s == NULL)
{
/* read into "new" stream */
if (length > in.size)
{
in.data = (uint8 *) xrealloc(in.data, length);
in.size = length;
}
in.end = in.p = in.data;
s = &in;
}
else
{
/* append to existing stream */
new_length = (s->end - s->data) + length;
if (new_length > s->size)
{
p_offset = s->p - s->data;
end_offset = s->end - s->data;
s->data = (uint8 *) xrealloc(s->data, new_length);
s->size = new_length;
s->p = s->data + p_offset;
s->end = s->data + end_offset;
}
}
while (length > 0)
{
if (!ui_select(sock))
/* User quit */
return NULL;
rcvd = recv(sock, s->end, length, 0);
if (rcvd < 0)
{
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if (rcvd == -1 && TCP_BLOCKS)
{
TCP_SLEEP(0);
rcvd = 0;
}
else
{
error("recv: %s\n", TCP_STRERROR);
return NULL;
}
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}
else if (rcvd == 0)
{
error("Connection closed\n");
return NULL;
}
s->end += rcvd;
length -= rcvd;
}
return s;
}
/* Establish a connection on the TCP layer */
BOOL
tcp_connect(char *server)
{
int true_value = 1;
#ifdef IPv6
int n;
struct addrinfo hints, *res, *ressave;
char tcp_port_rdp_s[10];
snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if ((n = getaddrinfo(server, tcp_port_rdp_s, &hints, &res)))
{
error("getaddrinfo: %s\n", gai_strerror(n));
return False;
}
ressave = res;
sock = -1;
while (res)
{
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (!(sock < 0))
{
if (connect(sock, res->ai_addr, res->ai_addrlen) == 0)
break;
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TCP_CLOSE(sock);
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sock = -1;
}
res = res->ai_next;
}
freeaddrinfo(ressave);
if (sock == -1)
{
error("%s: unable to connect\n", server);
return False;
}
#else /* no IPv6 support */
struct hostent *nslookup;
struct sockaddr_in servaddr;
if ((nslookup = gethostbyname(server)) != NULL)
{
memcpy(&servaddr.sin_addr, nslookup->h_addr, sizeof(servaddr.sin_addr));
}
else if ((servaddr.sin_addr.s_addr = inet_addr(server)) == INADDR_NONE)
{
error("%s: unable to resolve host\n", server);
return False;
}
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
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error("socket: %s\n", TCP_STRERROR);
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return False;
}
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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error("connect: %s\n", TCP_STRERROR);
TCP_CLOSE(sock);
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return False;
}
#endif /* IPv6 */
setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value));
in.size = 4096;
in.data = (uint8 *) xmalloc(in.size);
out.size = 4096;
out.data = (uint8 *) xmalloc(out.size);
return True;
}
/* Disconnect on the TCP layer */
void
tcp_disconnect(void)
{
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TCP_CLOSE(sock);
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}
char *
tcp_get_address()
{
static char ipaddr[32];
struct sockaddr_in sockaddr;
socklen_t len = sizeof(sockaddr);
if (getsockname(sock, (struct sockaddr *) &sockaddr, &len) == 0)
{
unsigned char *ip = (unsigned char *) &sockaddr.sin_addr;
sprintf(ipaddr, "%d.%d.%d.%d", ip[0], ip[1], ip[2], ip[3]);
}
else
strcpy(ipaddr, "127.0.0.1");
return ipaddr;
}
/* reset the state of the tcp layer */
/* Support for Session Directory */
void
tcp_reset_state(void)
{
sock = -1; /* reset socket */
/* Clear the incoming stream */
if (in.data != NULL)
xfree(in.data);
in.p = NULL;
in.end = NULL;
in.data = NULL;
in.size = 0;
in.iso_hdr = NULL;
in.mcs_hdr = NULL;
in.sec_hdr = NULL;
in.rdp_hdr = NULL;
in.channel_hdr = NULL;
/* Clear the outgoing stream */
if (out.data != NULL)
xfree(out.data);
out.p = NULL;
out.end = NULL;
out.data = NULL;
out.size = 0;
out.iso_hdr = NULL;
out.mcs_hdr = NULL;
out.sec_hdr = NULL;
out.rdp_hdr = NULL;
out.channel_hdr = NULL;
}