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/*
Copyright (C) 2006 Renaissance Technologies Corp.
main developer: HP Wei <hp@rentec.com>
Copyright (C) 2005 Renaissance Technologies Corp.
Copyright (C) 2001 Renaissance Technologies Corp.
main developer: HP Wei <hp@rentec.com>
Codes in this file are extraced and modified from page_reader.c
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.
*/
#include "rttmain.h"
/* the following is needed on Sun but not on linux */
#ifdef _SUN
#include <sys/filio.h>
#endif
extern char * my_MCAST_ADDR; /* defined in rttcatcher.c */
extern int my_PORT;
extern char * my_IFname;
int machineState;
int isFirstPage = TRUE;
int recfd;
#ifndef IPV6
struct sockaddr_in rec_addr;
#else
struct sockaddr_in6 rec_addr;
#endif
int *mode_ptr; /* change from char to int */
int *total_bytes_ptr;
int *current_page_ptr;
char *data_ptr;
char rec_buf[PAGE_BUFFSIZE];
void init_page_reader()
{
struct ip_mreq mreq;
int rcv_size;
machineState = IDLE_STATE;
/* Prepare buffer */
mode_ptr = (int*)rec_buf; /* hp: add the cast (int *) */
current_page_ptr = (int *)(mode_ptr + 1);
total_bytes_ptr = (int *)(current_page_ptr + 1);
data_ptr = (char *)(total_bytes_ptr + 1);
/* Set up receive socket */
if (verbose) fprintf(stderr, "setting up receive socket\n");
recfd = rec_socket(&rec_addr, my_PORT);
/* Join the multicast group */
if (Mcast_join(recfd, my_MCAST_ADDR, my_IFname, 0)<0) {
perror("Joining Multicast Group");
}
/* Increase socket receive buffer */
rcv_size = TOTAL_REC_PAGE * PAGE_BUFFSIZE;
if (setsockopt(recfd, SOL_SOCKET, SO_RCVBUF, &rcv_size, sizeof(rcv_size)) < 0){
perror("Expanding receive buffer");
}
}
/*
This is the heart of catcher.
It parses the incoming pages and do proper reactions according
to the mode (command code) encoded in the first 4 bytes in an UDP page.
It returns the mode.
Note: since rtt is intended to deal with one-to-one machine,
the four-state engine as in page_reader is not used.
*/
int read_handle_page()
{
#ifndef IPV6
struct sockaddr_in return_addr;
#else
struct sockaddr_in6 return_addr;
#endif
int bytes_read;
socklen_t return_len = (socklen_t)sizeof(return_addr);
int mode_v, total_bytes_v, current_page_v;
/* -----------receiving data -----------------*/
if (readable(recfd) == 1) { /* there is data coming in */
/* get data */
bytes_read = recvfrom(recfd, rec_buf, PAGE_BUFFSIZE, 0,
(struct sockaddr *)&return_addr,
(socklen_t*) &return_len);
total_bytes_v = ntohl(*total_bytes_ptr);
if (bytes_read != total_bytes_v) return NULL_CMD;
/* convert from network byte order to host byte order */
mode_v = ntohl(*mode_ptr);
current_page_v = ntohl(*current_page_ptr);
if (isFirstPage) {
update_complaint_address(&return_addr);
isFirstPage = FALSE;
}
/* get init wish list and return address first time only
if (firstTime){
if (verbose)
fprintf(stderr, "Initializing complaint_sender and wish_list\n");
init_complaint_sender(&return_addr);
firstTime = 0;
}
*/
/* --- process various commands */
switch (mode_v) {
case TEST:
/* It is just a test packet? */
fprintf(stderr, "********** Received test packet **********\n");
return mode_v;
case START_CMD:
if (verbose)
fprintf(stderr, "Start cmd received ---\n");
init_missingPages(current_page_v); /* Here: use current_page for total_pages */
send_complaint(START_OK, 0);
return mode_v;
case EOF_CMD:
if (verbose)
fprintf(stderr, "Check and ask for missing pages ---\n");
if (ask_for_missing_page()==0) {
/*
There is no missing page.
*/
send_complaint(EOF_OK, 0);
}
/*
else
There are missing pages.
Ack has been done in ask_for_missing_page()
*/
return mode_v;
case SENDING_DATA:
case RESENDING_DATA:
if (verbose){
fprintf(stderr, "Got %d bytes from page %d of %d, mode=%d\n",
bytes_read - HEAD_SIZE,
current_page_v, get_total_pages(), mode_v);
}
/* mode == SENDING_DATA, RESENDING_DATA */
page_received(current_page_v);
send_complaint(PAGE_RECV, 0);
/* Yes, we read a page */
return mode_v;
case ALL_DONE_CMD: /* this is presumably a good machine */
default:
return mode_v;
} /* end of switch */
} else {
/* No, the read timed out */
return TIMED_OUT;
}
}
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