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(const char *local_ip, int port,
107 struct hostent *dest;
108 struct sockaddr_in desthost;
110 SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
113 dest = gethostbyname(host);
115 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
116 "IP address", host));
120 /* Set socket information */
121 memset(&desthost, 0, sizeof(desthost));
122 desthost.sin_port = htons(port);
123 desthost.sin_family = AF_INET;
124 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
126 /* Create the connection socket */
127 sock = socket(AF_INET, SOCK_STREAM, 0);
128 if (sock == INVALID_SOCKET) {
129 SILC_LOG_ERROR(("Cannot create socket"));
133 /* Connect to the host */
134 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
135 err = WSAGetLastError();
136 if (rval == SOCKET_ERROR && err != WSAEWOULDBLOCK) {
137 SILC_LOG_ERROR(("Cannot connect to remote host"));
143 /* Set appropriate options */
144 #if defined(TCP_NODELAY)
145 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
147 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
149 SILC_LOG_DEBUG(("Connection created"));
154 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
155 socket or -1 on error. This creates non-blocking socket hence the
156 connection returns directly. To get the result of the connect() one
157 must select() the socket and read the result after it's ready. */
159 int silc_net_create_connection_async(const char *local_ip, int port,
164 struct hostent *dest;
165 struct sockaddr_in desthost;
167 SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
171 dest = gethostbyname(host);
173 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
174 "IP address", host));
178 /* Set socket information */
179 memset(&desthost, 0, sizeof(desthost));
180 desthost.sin_port = htons(port);
181 desthost.sin_family = AF_INET;
182 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
184 /* Create the connection socket */
185 sock = socket(AF_INET, SOCK_STREAM, 0);
186 if (sock == INVALID_SOCKET) {
187 SILC_LOG_ERROR(("Cannot create socket"));
191 /* Connect to the host */
192 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
193 err = WSAGetLastError();
194 if (rval == SOCKET_ERROR && err != WSAEWOULDBLOCK) {
195 SILC_LOG_ERROR(("Cannot connect to remote host"));
201 /* Set socket to nonblocking mode */
202 silc_net_set_socket_nonblock(sock);
204 /* Set appropriate options */
205 #if defined(TCP_NODELAY)
206 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
208 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
210 SILC_LOG_DEBUG(("Connection created"));
215 /* Closes the connection by closing the socket connection. */
217 void silc_net_close_connection(int sock)
222 /* Converts the IP number string from numbers-and-dots notation to
225 bool silc_net_addr2bin(const char *addr, unsigned char *bin,
230 ret = inet_addr(addr);
235 SILC_PUT32_LSB(ret, bin);
237 return ret != INADDR_NONE;
240 /* Converts the IP number string from numbers-and-dots notation to
241 binary form in network byte order. */
243 bool silc_net_addr2bin_ne(const char *addr, unsigned char *bin,
248 ret = inet_addr(addr);
253 SILC_PUT32_MSB(ret, bin);
255 return ret != INADDR_NONE;
258 /* Set socket to non-blocking mode. */
260 int silc_net_set_socket_nonblock(int sock)
262 unsigned long on = 1;
263 return ioctlsocket(sock, FIONBIO, &on);
268 bool silc_net_win32_init(void)
270 int ret, sopt = SO_SYNCHRONOUS_NONALERT;
272 WORD ver = MAKEWORD(1, 1);
274 ret = WSAStartup(ver, &wdata);
278 /* Allow using the SOCKET's as file descriptors so that we can poll
279 them with SILC Scheduler. */
280 ret = setsockopt(INVALID_SOCKET, SOL_SOCKET, SO_OPENTYPE, (char *)&sopt,
288 /* Uninit Winsock2 */
290 void silc_net_win32_uninit(void)