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)
34 struct sockaddr_in server;
35 int len = sizeof(server.sin_addr);
37 SILC_LOG_DEBUG(("Creating a new server listener"));
39 /* Create the socket */
40 sock = socket(PF_INET, SOCK_STREAM, 0);
42 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
46 /* Set the socket options */
47 rval = silc_net_set_socket_opt(sock, SOL_SOCKET, SO_REUSEADDR, 1);
49 SILC_LOG_ERROR(("Cannot set socket options: %s", strerror(errno)));
53 /* Set the socket information for bind() */
54 memset(&server, 0, sizeof(server));
55 server.sin_family = PF_INET;
57 server.sin_port = htons(port);
59 /* Convert IP address to network byte order */
61 silc_net_addr2bin(ip_addr, (unsigned char *)&server.sin_addr.s_addr, len);
63 server.sin_addr.s_addr = INADDR_ANY;
65 /* Bind the server socket */
66 rval = bind(sock, (struct sockaddr *)&server, sizeof(server));
68 SILC_LOG_ERROR(("Cannot bind socket: %s", strerror(errno)));
72 /* Specify that we are listenning */
73 rval = listen(sock, 5);
75 SILC_LOG_ERROR(("Cannot set socket listenning: %s", strerror(errno)));
79 /* Set the server socket to non-blocking mode */
80 silc_net_set_socket_nonblock(sock);
82 SILC_LOG_DEBUG(("Server listener created, fd=%d", sock));
87 void silc_net_close_server(int sock)
92 SILC_LOG_DEBUG(("Server socket closed"));
95 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
96 socket or -1 on error. This blocks the process while trying to create
99 int silc_net_create_connection(int port, char *host)
102 struct hostent *dest;
103 struct sockaddr_in desthost;
105 SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
108 dest = gethostbyname(host);
110 SILC_LOG_ERROR(("Network (%s) unreachable", host));
114 /* Set socket information */
115 memset(&desthost, 0, sizeof(desthost));
116 desthost.sin_port = htons(port);
117 desthost.sin_family = PF_INET;
118 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
120 /* Create the connection socket */
121 sock = socket(PF_INET, SOCK_STREAM, 0);
123 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
127 /* Connect to the host */
128 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
130 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
136 /* Set appropriate options */
137 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
138 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
140 SILC_LOG_DEBUG(("Connection created"));
145 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
146 socket or -1 on error. This creates non-blocking socket hence the
147 connection returns directly. To get the result of the connect() one
148 must select() the socket and read the result after it's ready. */
150 int silc_net_create_connection_async(int port, char *host)
153 struct hostent *dest;
154 struct sockaddr_in desthost;
156 SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
160 dest = gethostbyname(host);
162 SILC_LOG_ERROR(("Network (%s) unreachable", host));
166 /* Set socket information */
167 memset(&desthost, 0, sizeof(desthost));
168 desthost.sin_port = htons(port);
169 desthost.sin_family = PF_INET;
170 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
172 /* Create the connection socket */
173 sock = socket(PF_INET, SOCK_STREAM, 0);
175 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
179 /* Set the socket to non-blocking mode */
180 silc_net_set_socket_nonblock(sock);
182 /* Connect to the host */
183 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
185 if (errno != EINPROGRESS) {
186 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
193 /* Set appropriate options */
194 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
195 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
197 SILC_LOG_DEBUG(("Connection operation in progress"));
202 /* Closes the connection */
204 void silc_net_close_connection(int sock)
209 /* Set's the socket to non-blocking mode. */
211 int silc_net_set_socket_nonblock(int sock)
213 return fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
216 /* Converts the IP number string from numbers-and-dots notation to
219 bool silc_net_addr2bin(const char *addr, unsigned char *bin,
225 ret = inet_aton(addr, &tmp);
230 SILC_PUT32_LSB(tmp.s_addr, bin);