sctpserv02.c

unix网络编程第一卷socket编程书上的全部源代码

#include	"unp.h"

int
main(int argc, char **argv)
{
	int sock_fd,msg_flags;
	char readbuf[BUFFSIZE];
	struct sockaddr_in servaddr, cliaddr;
	struct sctp_sndrcvinfo sri;
	struct sctp_event_subscribe evnts;
	int stream_increment=1;
	socklen_t len;
	size_t rd_sz;
	struct sctp_initmsg initm;

/* include modified_sctpserv02 */
	if (argc == 2)
		stream_increment = atoi(argv[1]);
        sock_fd = Socket(AF_INET, SOCK_SEQPACKET, IPPROTO_SCTP);
	bzero(&initm,sizeof(initm));
	initm.sinit_num_ostreams = SERV_MORE_STRMS_SCTP;
	Setsockopt(sock_fd, IPPROTO_SCTP, SCTP_INITMSG,
		   &initm, sizeof(initm));
/* end modified_sctpserv02 */
	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(SERV_PORT);

	Bind(sock_fd, (SA *) &servaddr, sizeof(servaddr));
	
	bzero(&evnts, sizeof(evnts));
	evnts.sctp_data_io_event = 1;
	Setsockopt(sock_fd, IPPROTO_SCTP, SCTP_EVENTS,
		   &evnts, sizeof(evnts));

	Listen(sock_fd, LISTENQ);
	for ( ; ; ) {
		len = sizeof(struct sockaddr_in);
		rd_sz = Sctp_recvmsg(sock_fd, readbuf, sizeof(readbuf),
			     (SA *)&cliaddr, &len,
			     &sri,&msg_flags);
		if(stream_increment) {
			sri.sinfo_stream++;
			if(sri.sinfo_stream >= sctp_get_no_strms(sock_fd,(SA *)&cliaddr, len)) 
				sri.sinfo_stream = 0;
		}
		Sctp_sendmsg(sock_fd, readbuf, rd_sz, 
			     (SA *)&cliaddr, len,
			     sri.sinfo_ppid,
			     sri.sinfo_flags,
			     sri.sinfo_stream,
			     0, 0);
	}
}