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/*
Copyright (C) 2006 Renaissance Technologies Corp.
main developer: HP Wei <hp@rentec.com>
make it IPv6-ready
Copyright (C) 2005 Renaissance Technologies Corp.
file name is changed from main.c to setup_socket.c
Copyright (C) 2001 Renaissance Technologies Corp.
main developer: HP Wei <hp@rentec.com>
This file was modified in 2001 and later from files in the program
multicaster copyrighted by Aaron Hillegass as found at
<http://sourceforge.net/projects/multicaster/>
Copyright (C) 2000 Aaron Hillegass <aaron@classmax.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING.
If not, write to the Free Software Foundation,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
This part was based on
(1) codes by Aaron Hillegass <aaron@classmax.com>
(2) codes in Steven's book 'network programming'
200605 change it to make it IPv6 ready
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/un.h>
#include <stdio.h>
#include <stdlib.h>
#include <netinet/in.h> /* sockaddr_in{} and other Internet defns */
#include <arpa/inet.h> /* inet(3) functions */
#include <errno.h>
extern int verbose;
int delay_sec;
int delay_usec;
/* Set up for catcher's complaint socket */
#ifndef IPV6
int complaint_socket(struct sockaddr_in *addr, int port)
#else
int complaint_socket(struct sockaddr_in6 *addr, int port)
#endif
{
int fd, sockaddr_len;
sa_family_t family;
if (verbose>=2) fprintf(stderr, "in send_socket_ip\n");
#ifndef IPV6
/* IPv4 */
sockaddr_len = sizeof(struct sockaddr_in);
memset(addr, 0, sockaddr_len);
addr->sin_family = AF_INET;
family = AF_INET;
addr->sin_port = htons(port);
/*addr->sin_addr.s_addr = ip; this fx in for init process only
This ip will be overwritten later after
1st packet is received. */
#else
/* IPv6 */
sockaddr_len = sizeof(struct sockaddr_in6);
memset(addr, 0, sockaddr_len);
addr->sin6_family = AF_INET6;
family = AF_INET6;
addr->sin6_port = htons(port);
/* addr->sin_addr.s_addr = ip; see comments above */
#endif
if ((fd = socket(family, SOCK_DGRAM, 0)) < 0){
perror("Send socket");
exit(1);
}
return fd;
}
/* Set up mcast send socket for multicaster based on (char*)cp */
#ifndef IPV6
int send_socket(struct sockaddr_in *addr, char * cp, int port)
#else
int send_socket(struct sockaddr_in6 *addr, char * cp, int port)
#endif
{
int fd, sockaddr_len;
sa_family_t family;
char buf[50];
if (verbose>=2) fprintf(stderr, "in send_socket\n");
#ifndef IPV6
/* IPv4 */
sockaddr_len = sizeof(struct sockaddr_in);
memset(addr, 0, sockaddr_len);
addr->sin_family = AF_INET;
family = AF_INET;
addr->sin_port = htons(port);
/*addr->sin_addr.s_addr = inet_addr(cp);*/
inet_pton(AF_INET, cp, &addr->sin_addr);
/* Print out IP address and port */
inet_ntop(AF_INET, &addr->sin_addr, buf, 50);
#else
sockaddr_len = sizeof(struct sockaddr_in6);
memset(addr, 0, sockaddr_len);
addr->sin6_family = AF_INET6;
family = AF_INET6;
addr->sin6_port = htons(port);
/*addr->sin_addr.s_addr = inet_addr(cp);*/
inet_pton(AF_INET6, cp, &addr->sin6_addr);
/* Print out IP address and port */
inet_ntop(AF_INET6, &addr->sin6_addr, buf, 50);
#endif
if (verbose>=2)
fprintf(stderr, "Creating a send socket to %s:%d\n", buf, port);
if ((fd = socket(family, SOCK_DGRAM, 0)) < 0){
perror("Send socket");
exit(1);
}
if ((bind(fd, (const struct sockaddr *)addr, sockaddr_len)) < 0){
perror("in send_socket(): bind error (need to change MCAST_ADDR)");
exit(1);
}
return fd; /*send_socket_ip(addr, address, port);*/
}
/* set up socket on the receiving end */
#ifndef IPV6
int rec_socket(struct sockaddr_in *addr, int port)
#else
int rec_socket(struct sockaddr_in6 *addr, int port)
#endif
{
int fd, sockaddr_len;
sa_family_t family;
#ifndef IPV6
/* IPv4 */
sockaddr_len = sizeof(struct sockaddr_in);
memset(addr, 0, sockaddr_len);
addr->sin_family = AF_INET;
family = AF_INET;
addr->sin_port = htons(port);
addr->sin_addr.s_addr = htonl(INADDR_ANY);
#else
sockaddr_len = sizeof(struct sockaddr_in6);
memset(addr, 0, sockaddr_len);
addr->sin6_family = AF_INET6;
family = AF_INET6;
addr->sin6_port = htons(port);
addr->sin6_addr = in6addr_any; /* RS book: page 92 */
#endif
if((fd = socket(family, SOCK_DGRAM, 0)) < 0){
perror("Socket create");
exit(1);
}
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, NULL, 0);
if (verbose>=2)
fprintf(stderr, "Creating receive socket on port %d\n", port);
/*if ((bind(fd, addr, sizeof(*addr))) < 0){ MOD by RWM: replaced by next line */
if ((bind(fd, (const struct sockaddr *)addr, sockaddr_len)) < 0){
perror("in rec_socket(): bind error (need to change PORT)");
exit(1);
}
return fd;
}
/*
set the values of two variables to be used by select()
in readable().
*/
void set_delay(int secs, int usecs)
{
if (verbose>=2) {
if (usecs == -1)
fprintf(stderr, "Timeout: set to infinite\n");
else
fprintf(stderr, "Timeout: set to %d sec + %d usec\n", secs, usecs);
}
delay_sec = secs;
delay_usec = usecs;
}
void get_delay(int * secs, int * usecs)
{
*secs = delay_sec;
*usecs= delay_usec;
}
/*
Check if there is an incoming UDP for a certain amount
of time period specified in delay_tv..
Return 'true' if there is.
Return 'false' if no valid UDP has arrived within the time period.
In multicaster, this is used in read_handle_page() right after
send_page() is carried out. As a result, read_handle_complaint() waits
for any incoming complaints from any target machines within
the specified time period. As it is now, no target machine
will send back complaints during the transmission of all the
pages for a file. Therefore, read_handle_complaint() serves effectively
as a time delay between sending of each page.
*/
int readable(int fd)
{
struct timeval delay_tv;
fd_set rset;
FD_ZERO(&rset);
FD_SET(fd, &rset);
/*
if microsec == -1 wait forever for a packet.
This is used in the beginning when multicatcher is just
invoked.
*/
if (delay_usec == -1){
return(select(fd + 1, &rset, NULL, NULL, NULL));
} else {
delay_tv.tv_sec = delay_sec;
delay_tv.tv_usec = delay_usec;
return (select(fd + 1, &rset, NULL, NULL, &delay_tv));
}
}
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