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 /* Closes the server by closing the socket connection. */
89 void silc_net_close_server(int sock)
94 SILC_LOG_DEBUG(("Server socket closed"));
97 /* Creates a connection (TCP/IP) to a remote host. Returns the connection
98 socket or -1 on error. This blocks the process while trying to create
101 int silc_net_create_connection(int port, char *host)
104 struct hostent *dest;
105 struct sockaddr_in desthost;
107 SILC_LOG_DEBUG(("Creating connection to host %s port %d", host, port));
110 dest = gethostbyname(host);
112 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
113 "IP address", host));
117 /* Set socket information */
118 memset(&desthost, 0, sizeof(desthost));
119 desthost.sin_port = htons(port);
120 desthost.sin_family = PF_INET;
121 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
123 /* Create the connection socket */
124 sock = socket(PF_INET, SOCK_STREAM, 0);
126 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
130 /* Connect to the host */
131 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
133 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
139 /* Set appropriate options */
140 #if defined(TCP_NODELAY)
141 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)
158 struct hostent *dest;
159 struct sockaddr_in desthost;
161 SILC_LOG_DEBUG(("Creating connection (async) to host %s port %d",
165 dest = gethostbyname(host);
167 SILC_LOG_ERROR(("Network (%s) unreachable: could not resolve the "
168 "IP address", host));
172 /* Set socket information */
173 memset(&desthost, 0, sizeof(desthost));
174 desthost.sin_port = htons(port);
175 desthost.sin_family = PF_INET;
176 memcpy(&desthost.sin_addr, dest->h_addr_list[0], sizeof(desthost.sin_addr));
178 /* Create the connection socket */
179 sock = socket(PF_INET, SOCK_STREAM, 0);
181 SILC_LOG_ERROR(("Cannot create socket: %s", strerror(errno)));
185 /* Set the socket to non-blocking mode */
186 silc_net_set_socket_nonblock(sock);
188 /* Connect to the host */
189 rval = connect(sock, (struct sockaddr *)&desthost, sizeof(desthost));
191 if (errno != EINPROGRESS) {
192 SILC_LOG_ERROR(("Cannot connect to remote host: %s", strerror(errno)));
199 /* Set appropriate options */
200 #if defined(TCP_NODELAY)
201 silc_net_set_socket_opt(sock, IPPROTO_TCP, TCP_NODELAY, 1);
203 silc_net_set_socket_opt(sock, SOL_SOCKET, SO_KEEPALIVE, 1);
205 SILC_LOG_DEBUG(("Connection operation in progress"));
210 /* Closes the connection by closing the socket connection. */
212 void silc_net_close_connection(int sock)
217 /* Set's the socket to non-blocking mode. */
219 int silc_net_set_socket_nonblock(int sock)
221 return fcntl(sock, F_SETFL, fcntl(sock, F_GETFL, 0) | O_NONBLOCK);
224 /* Converts the IP number string from numbers-and-dots notation to
227 bool silc_net_addr2bin(const char *addr, unsigned char *bin,
233 ret = inet_aton(addr, &tmp);
238 SILC_PUT32_LSB(tmp.s_addr, bin);