5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2001 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
22 #include "silcincludes.h"
25 /* This function creates server or daemon or listener or what ever. This
26 does not fork a new process, it must be done by the caller if caller
27 wants to create a child process. This is used by the SILC server.
28 If argument `ip_addr' is NULL `any' address will be used. Returns
29 the created socket or -1 on error. */
31 int silc_net_create_server(int port, char *ip_addr)
35 struct sockaddr_in server;
36 int len = sizeof(server.sin_addr);
38 SILC_LOG_DEBUG(("Creating a new server listener"));
40 /* Create the socket */
41 sock = socket(PF_INET, SOCK_STREAM, 0);
42 if (sock == INVALID_SOCKET) {
43 SILC_LOG_ERROR(("Cannot create socket"));
47 /* Set the socket options */
48 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
50 SILC_LOG_ERROR(("Cannot set socket options"));
55 /* Set the socket information for bind() */
56 memset(&server, 0, sizeof(server));
57 server.sin_family = AF_INET;
59 server.sin_port = htons(port);
61 /* Convert IP address to network byte order */
63 silc_net_addr2bin(ip_addr, (unsigned char *)&server.sin_addr.s_addr, len);
65 server.sin_addr.s_addr = INADDR_ANY;
67 /* Bind the server socket */
68 rval = bind(sock, (struct sockaddr *)&server, sizeof(server));
70 SILC_LOG_ERROR(("Cannot bind socket"));
75 /* Specify that we are listenning */
76 rval = listen(sock, 5);
78 SILC_LOG_ERROR(("Cannot set socket listenning"));
83 SILC_LOG_DEBUG(("Server listener created, fd=%d", sock));
88 /* Closes the server by closing the socket connection. */
90 void silc_net_close_server(int sock)
95 SILC_LOG_DEBUG(("Server socket closed"));
98 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
99 socket or -1 on error. This blocks the process while trying to create
102 int silc_net_create_connection(int port, char *host)
106 struct hostent *dest;
107 struct sockaddr_in desthost;
109 SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
112 dest = gethostbyname(host);
114 SILC_LOG_ERROR(("Network (%s) unreachable", host));
118 /* Set socket information */
119 memset(&desthost, 0, sizeof(desthost));
120 desthost.sin_port = htons(port);
121 desthost.sin_family = AF_INET;
122 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
124 /* Create the connection socket */
125 sock = socket(AF_INET, SOCK_STREAM, 0);
126 if (sock == INVALID_SOCKET) {
127 SILC_LOG_ERROR(("Cannot create socket"));
131 /* Connect to the host */
132 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
133 err = WSAGetLastError();
134 if (rval == SOCKET_ERROR && err != WSAEWOULDBLOCK) {
135 SILC_LOG_ERROR(("Cannot connect to remote host"));
141 /* Set appropriate options */
142 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
143 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
145 SILC_LOG_DEBUG(("Connection created"));
150 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
151 socket or -1 on error. This creates non-blocking socket hence the
152 connection returns directly. To get the result of the connect() one
153 must select() the socket and read the result after it's ready. */
155 int silc_net_create_connection_async(int port, char *host)
159 struct hostent *dest;
160 struct sockaddr_in desthost;
162 SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
166 dest = gethostbyname(host);
168 SILC_LOG_ERROR(("Network (%s) unreachable", host));
172 /* Set socket information */
173 memset(&desthost, 0, sizeof(desthost));
174 desthost.sin_port = htons(port);
175 desthost.sin_family = AF_INET;
176 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
178 /* Create the connection socket */
179 sock = socket(AF_INET, SOCK_STREAM, 0);
180 if (sock == INVALID_SOCKET) {
181 SILC_LOG_ERROR(("Cannot create socket"));
185 /* Connect to the host */
186 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
187 err = WSAGetLastError();
188 if (rval == SOCKET_ERROR && err != WSAEWOULDBLOCK) {
189 SILC_LOG_ERROR(("Cannot connect to remote host"));
195 /* Set socket to nonblocking mode */
196 silc_net_set_socket_nonblock(sock);
198 /* Set appropriate options */
199 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
200 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
202 SILC_LOG_DEBUG(("Connection created"));
207 /* Closes the connection by closing the socket connection. */
209 void silc_net_close_connection(int sock)
214 /* Converts the IP number string from numbers-and-dots notation to
217 bool silc_net_addr2bin(const char *addr, unsigned char *bin,
222 ret = inet_addr(addr);
227 SILC_PUT32_LSB(ret, bin);
229 return ret != INADDR_NONE;
232 /* Set socket to non-blocking mode. */
234 int silc_net_set_socket_nonblock(int sock)
236 unsigned long on = 1;
237 return ioctlsocket(sock, FIONBIO, &on);
242 bool silc_net_win32_init(void)
244 int ret, sopt = SO_SYNCHRONOUS_NONALERT;
246 WORD ver = MAKEWORD(1, 1);
248 ret = WSAStartup(ver, &wdata);
252 /* Allow using the SOCKET's as file descriptors so that we can poll
253 them with SILC Scheduler. */
254 ret = setsockopt(INVALID_SOCKET, SOL_SOCKET, SO_OPENTYPE, (char *)&sopt,
262 /* Uninit Winsock2 */
264 void silc_net_win32_uninit(void)