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/* |
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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 1999-2002 |
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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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static struct stream out; |
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extern int 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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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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|
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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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|
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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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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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} |
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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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|
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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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struct hostent *nslookup; |
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struct sockaddr_in servaddr; |
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int true_value = 1; |
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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(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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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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out.size = 4096; |
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out.data = (uint8 *) xmalloc(out.size); |
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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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