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matty |
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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 1999-2000 |
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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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#include "includes.h" |
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/* Establish a connection on the TCP layer */ |
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HCONN 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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struct connection *conn; |
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int sock; |
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int true = 1; |
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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 (!inet_aton(server, &servaddr.sin_addr)) |
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{ |
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fprintf(stderr, "%s: unable to resolve host\n", server); |
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return NULL; |
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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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fprintf(stderr, "socket: %s\n", strerror(errno)); |
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return NULL; |
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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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if (connect(sock, (struct sockaddr *)&servaddr, sizeof(struct sockaddr)) < 0) |
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{ |
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fprintf(stderr, "connect: %s\n", strerror(errno)); |
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close(sock); |
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return NULL; |
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} |
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setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &true, sizeof(true)); |
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conn = xmalloc(sizeof(struct connection)); |
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STREAM_INIT(conn->in, False); |
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STREAM_INIT(conn->out, True); |
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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); |
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} |
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/* Send TCP transport data packet */ |
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BOOL tcp_send(HCONN conn) |
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{ |
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int length = conn->out.end; |
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int sent, total = 0; |
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while (total < length) |
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{ |
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sent = write(conn->tcp_socket, conn->out.data + total, |
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length - total); |
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if (sent <= 0) |
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{ |
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fprintf(stderr, "write: %s\n", strerror(errno)); |
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return False; |
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} |
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total += sent; |
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} |
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conn->out.offset = 0; |
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conn->out.end = conn->out.size; |
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return True; |
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} |
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/* Receive a message on the TCP layer */ |
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BOOL tcp_recv(HCONN conn, int length) |
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{ |
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int rcvd; |
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STREAM_SIZE(conn->in, length); |
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conn->in.end = conn->in.offset = 0; |
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while (length > 0) |
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{ |
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rcvd = read(conn->tcp_socket, conn->in.data + conn->in.end, |
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length); |
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if (rcvd <= 0) |
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{ |
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fprintf(stderr, "read: %s\n", strerror(errno)); |
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return False; |
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} |
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conn->in.end += rcvd; |
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length -= rcvd; |
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} |
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return True; |
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} |