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/* -*- 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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|
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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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|
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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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|
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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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|
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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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#include "rdesktop.h" |
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|
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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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|
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static int sock; |
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static struct stream in; |
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#ifndef WITH_SCARD |
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static struct stream out; |
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#endif |
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int g_tcp_port_rdp = TCP_PORT_RDP; |
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|
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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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STREAM result = NULL; |
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|
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#ifdef WITH_SCARD |
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scard_lock(SCARD_LOCK_TCP); |
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result = scard_tcp_init(); |
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#else |
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result = &out; |
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#endif |
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|
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if (maxlen > result->size) |
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{ |
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result->data = (uint8 *) xrealloc(result->data, maxlen); |
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result->size = maxlen; |
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} |
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|
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result->p = result->data; |
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result->end = result->data + result->size; |
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#ifdef WITH_SCARD |
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scard_unlock(SCARD_LOCK_TCP); |
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#endif |
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return result; |
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} |
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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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|
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#ifdef WITH_SCARD |
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scard_lock(SCARD_LOCK_TCP); |
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#endif |
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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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error("send: %s\n", strerror(errno)); |
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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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#ifdef WITH_SCARD |
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scard_unlock(SCARD_LOCK_TCP); |
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#endif |
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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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|
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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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|
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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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|
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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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error("recv: %s\n", strerror(errno)); |
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return NULL; |
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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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|
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s->end += rcvd; |
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length -= rcvd; |
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} |
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|
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return s; |
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} |
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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 true_value = 1; |
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|
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#ifdef IPv6 |
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|
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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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|
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snprintf(tcp_port_rdp_s, 10, "%d", g_tcp_port_rdp); |
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|
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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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|
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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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|
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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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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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|
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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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|
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#else /* no IPv6 support */ |
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|
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struct hostent *nslookup; |
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struct sockaddr_in servaddr; |
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|
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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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|
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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", strerror(errno)); |
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return False; |
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} |
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|
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servaddr.sin_family = AF_INET; |
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servaddr.sin_port = htons(g_tcp_port_rdp); |
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|
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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", strerror(errno)); |
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close(sock); |
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return False; |
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} |
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|
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#endif /* IPv6 */ |
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|
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setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (void *) &true_value, sizeof(true_value)); |
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|
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in.size = 4096; |
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in.data = (uint8 *) xmalloc(in.size); |
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|
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#ifdef WITH_SCARD |
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scard_tcp_connect(); |
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#else |
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out.size = 4096; |
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out.data = (uint8 *) xmalloc(out.size); |
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#endif |
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|
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return True; |
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} |
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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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close(sock); |
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} |
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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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|
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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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|
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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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|
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/* Clear the outgoing stream(s) */ |
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#ifdef WITH_SCARD |
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scard_tcp_reset_state(); |
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#else |
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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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#endif |
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} |
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