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247 lines
6.7 KiB
247 lines
6.7 KiB
/*
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* $Id$
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*
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* Copyright (C) 2012 Smile Communications, jason.penton@smilecoms.com
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* Copyright (C) 2012 Smile Communications, richard.good@smilecoms.com
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*
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* The initial version of this code was written by Dragos Vingarzan
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* (dragos(dot)vingarzan(at)fokus(dot)fraunhofer(dot)de and the
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* Fruanhofer Institute. It was and still is maintained in a separate
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* branch of the original SER. We are therefore migrating it to
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* Kamailio/SR and look forward to maintaining it from here on out.
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* 2011/2012 Smile Communications, Pty. Ltd.
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* ported/maintained/improved by
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* Jason Penton (jason(dot)penton(at)smilecoms.com and
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* Richard Good (richard(dot)good(at)smilecoms.com) as part of an
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* effort to add full IMS support to Kamailio/SR using a new and
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* improved architecture
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*
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* NB: Alot of this code was originally part of OpenIMSCore,
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* FhG Fokus.
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* Copyright (C) 2004-2006 FhG Fokus
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* Thanks for great work! This is an effort to
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* break apart the various CSCF functions into logically separate
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* components. We hope this will drive wider use. We also feel
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* that in this way the architecture is more complete and thereby easier
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* to manage in the Kamailio/SR environment
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*
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* This file is part of Kamailio, a free SIP server.
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*
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* Kamailio 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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*
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* Kamailio 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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*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <assert.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <signal.h>
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#include <netinet/in.h>
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#include <netdb.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "utils.h"
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#include "globals.h"
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#include "tcp_accept.h"
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#include "receiver.h"
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#include "../../cfg/cfg_struct.h"
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/* defined in ../diameter_peer.c */
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int dp_add_pid(pid_t pid);
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unsigned int *listening_socks=0; /**< array of sockets listening for connections */
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extern int h_errno;
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/**
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* Creates a socket and binds it.
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* @param listen_port - port to listen to
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* @param bind_to - IP address to bind to - if empty, will bind to :: (0.0.0.0) (all)
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* @param sock - socket to be update with the identifier of the opened one
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* @returns 1 on success, 0 on error
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*/
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int create_socket(int listen_port,str bind_to,unsigned int *sock)
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{
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unsigned int server_sock=-1;
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struct addrinfo *ainfo=0,*res=0,hints;
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char buf[256],host[256],serv[256];
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int error=0;
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unsigned int option;
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memset (&hints, 0, sizeof(hints));
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//hints.ai_protocol = IPPROTO_SCTP;
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//hints.ai_protocol = IPPROTO_TCP;
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hints.ai_flags = AI_PASSIVE|AI_ADDRCONFIG;
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hints.ai_socktype = SOCK_STREAM;
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sprintf(buf,"%d",listen_port);
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if (bind_to.len){
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error = getaddrinfo(bind_to.s, buf, &hints, &res);
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if (error!=0){
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LM_WARN("create_socket(): Error opening %.*s port %d while doing gethostbyname >%s\n",
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bind_to.len,bind_to.s,listen_port,gai_strerror(error));
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goto error;
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}
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}else{
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error = getaddrinfo(NULL, buf, &hints, &res);
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if (error!=0){
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LM_WARN("create_socket(): Error opening ANY port %d while doing gethostbyname >%s\n",
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listen_port,gai_strerror(error));
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goto error;
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}
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}
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LM_DBG("create_sockets: create socket and bind for IPv4...\n");
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for(ainfo = res;ainfo;ainfo = ainfo->ai_next)
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{
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if (getnameinfo(ainfo->ai_addr,ainfo->ai_addrlen,
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host,256,serv,256,NI_NUMERICHOST|NI_NUMERICSERV)==0){
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LM_WARN("create_socket(): Trying to open/bind/listen on %s port %s\n",
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host,serv);
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}
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if ((server_sock = socket(ainfo->ai_family, ainfo->ai_socktype, ainfo->ai_protocol)) == -1) {
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LM_ERR("create_socket(): error creating server socket on %s port %s >"
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" %s\n",host,serv,strerror(errno));
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goto error;
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}
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option = 1;
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setsockopt(server_sock,SOL_SOCKET,SO_REUSEADDR,&option,sizeof(option));
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if (bind( server_sock,ainfo->ai_addr,ainfo->ai_addrlen)==-1 ) {
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LM_ERR("create_socket(): error binding on %s port %s >"
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" %s\n",host,serv,strerror(errno));
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goto error;
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}
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if (listen( server_sock, 5) == -1) {
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LM_ERR("create_socket(): error listening on %s port %s > %s\n",host,serv,strerror(errno) );
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goto error;
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}
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*sock = server_sock;
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LM_WARN("create_socket(): Successful socket open/bind/listen on %s port %s\n",
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host,serv);
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}
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if (res) freeaddrinfo(res);
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return 1;
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error:
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if (res) freeaddrinfo(res);
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if (server_sock!=-1) close(server_sock);
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return 0;
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}
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/**
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* Accepts an incoming connection by forking a receiver process.
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* @param server_sock - socket that this connection came in to
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* @param new_sock - socket to be update with the value of the accepter socket
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* @returns 1 on success, 0 on error
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*/
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inline static int accept_connection(int server_sock,int *new_sock)
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{
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unsigned int length;
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struct sockaddr_in remote;
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/* do accept */
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length = sizeof( struct sockaddr_in);
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*new_sock = accept( server_sock, (struct sockaddr*)&remote, &length);
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if (*new_sock==-1) {
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LM_ERR("accept_connection(): accept failed!\n");
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goto error;
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} else {
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LM_INFO("accept_connection(): new tcp connection accepted!\n");
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}
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receiver_send_socket(*new_sock,0);
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return 1;
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error:
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return 0;
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}
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/**
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* Accept loop that listens for incoming connections on all listening sockets.
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* When a connection is received, accept_connection() is called.
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* @returns only on shutdown
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*/
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void accept_loop()
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{
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fd_set listen_set;
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struct timeval timeout;
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int i=0,max_sock=0,nready;
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int new_sock;
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while(listening_socks[i]){
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if (listening_socks[i]>max_sock) max_sock=listening_socks[i];
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i++;
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}
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while(1){
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if (shutdownx && *shutdownx) break;
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cfg_update();
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timeout.tv_sec=2;
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timeout.tv_usec=0;
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FD_ZERO(&listen_set);
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i=0;
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while(listening_socks[i]){
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FD_SET(listening_socks[i],&listen_set);
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i++;
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}
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nready = select( max_sock+1, &listen_set, 0, 0, &timeout);
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if (nready == 0){
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LM_DBG("accept_loop(): No connection attempts\n");
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continue;
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}
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if (nready == -1) {
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if (errno == EINTR) {
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continue;
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} else {
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LM_ERR("accept_loop(): select fails: %s\n",
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strerror(errno));
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sleep(2);
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continue;
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}
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}
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i=0;
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while(listening_socks[i]){
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if (FD_ISSET(listening_socks[i],&listen_set)){
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accept_connection(listening_socks[i],&new_sock);
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}
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i++;
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}
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}
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}
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