Error when build apps SCTP

Error when build apps SCTP

[Thanh Nguyen]

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Hi,my name Thanh Nguyen.Student of University of Science Ho Chi Minh
City Viet Nam.I have one problem with SCTP API.
I have source code one example client server SCTP. (Attach).But when
build with gcc (using command gcc client.c -o client) was error as:
"'union sctp_notification’ has no member named ‘sn_types’
And I check struct sctp_notification but sn_types is member of this
struct.Why error?
If you have example same it, and paper abount SCTP API.Please send to
me.Thanks a lot.
Source example,I take it from Oracle example.Code server build ok.
I have install LKSCTP, Fedora 13,GCC.  


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/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* To enable socket features used for SCTP socket. */
#define _XPG4_2
#define __EXTENSIONS__

#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <netinet/sctp.h>
#include <netdb.h>
#include <sys/uio.h>
#include <netinet/in.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/poll.h>
#include <arpa/inet.h>


#define BUFLEN 1024

static void
usage(char *a0)
{
    fprintf(stderr, "Usage: %s <addr>\n", a0);
}

/*
 * Read from the network.
 */
static void
readit(void *vfdp)
{
    int   fd;
    ssize_t   n;
    char   buf[BUFLEN];
    struct msghdr  msg[1];
    struct iovec  iov[1];
    struct cmsghdr  *cmsg;
    struct sctp_sndrcvinfo *sri;
    char   cbuf[sizeof (*cmsg) + sizeof (*sri)];
    union sctp_notification *snp;

    pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);

    fd = *(int *)vfdp;

    /* Initialize the message header for receiving */
    memset(msg, 0, sizeof (*msg));
    msg->msg_control = cbuf;
    msg->msg_controllen = sizeof (*cmsg) + sizeof (*sri);
    msg->msg_flags = 0;
    cmsg = (struct cmsghdr *)cbuf;
    sri = (struct sctp_sndrcvinfo *)(cmsg + 1);
    iov->iov_base = buf;
    iov->iov_len = BUFLEN;
    msg->msg_iov = iov;
    msg->msg_iovlen = 1;

    while ((n = recvmsg(fd, msg, 0)) > 0) {
        /* Intercept notifications here */
        if (msg->msg_flags & MSG_NOTIFICATION) {
            snp = (union sctp_notification *)buf;
            printf("[ Receive notification type %u ]\n",
                snp->sn_types);
            continue;
        }
        msg->msg_control = cbuf;
        msg->msg_controllen = sizeof (*cmsg) + sizeof (*sri);
        printf("[ Receive echo (%u bytes): stream = %hu, ssn = %hu, "
            "flags = %hx, ppid = %u ]\n", n,
            sri->sinfo_stream, sri->sinfo_ssn, sri->sinfo_flags,
            sri->sinfo_ppid);
    }

    if (n < 0) {
        perror("recv");
        exit(1);
    }

    close(fd);
    exit(0);
}

#define MAX_STREAM 64

static void
echo(struct sockaddr_in *addr)
{
    int     fd;
    u_char     buf[BUFLEN];
    ssize_t    n;
    int    perr;
    pthread_t   tid;
    struct cmsghdr   *cmsg;
    struct sctp_sndrcvinfo  *sri;
    char    cbuf[sizeof (*cmsg) + sizeof (*sri)];
    struct msghdr   msg[1];
    struct iovec   iov[1];
    int    ret;
    struct sctp_initmsg   initmsg;
    struct sctp_event_subscribe events;

    /* Create a one-one SCTP socket */
    if ((fd = socket(AF_INET, SOCK_STREAM, IPPROTO_SCTP)) == -1) {
        perror("socket");
        exit(1);
    }

    /*
     * We are interested in association change events and we want
     * to get sctp_sndrcvinfo in each receive.
     */
    events.sctp_association_event = 1; 
    events.sctp_data_io_event = 1; 
    ret = setsockopt(fd, IPPROTO_SCTP, SCTP_EVENTS, &events,
        sizeof (events));
    if (ret < 0) {
        perror("setsockopt SCTP_EVENTS");
        exit(1);
    }

    /*
     * Set the SCTP stream parameters to tell the other side when
     * setting up the association.
     */
    memset(&initmsg, 0, sizeof(struct sctp_initmsg));
    initmsg.sinit_num_ostreams = MAX_STREAM;
    initmsg.sinit_max_instreams = MAX_STREAM;
    initmsg.sinit_max_attempts = MAX_STREAM;
    ret = setsockopt(fd, IPPROTO_SCTP, SCTP_INITMSG, &initmsg,
        sizeof(struct sctp_initmsg));
    if (ret < 0) {
        perror("setsockopt SCTP_INITMSG");
        exit(1);
    }

    if (connect(fd, (struct sockaddr *)addr, sizeof (*addr)) == -1) {
        perror("connect");
        exit(1);
    }

    /* Initialize the message header structure for sending. */
    memset(msg, 0, sizeof (*msg));
    iov->iov_base = buf;
    msg->msg_iov = iov;
    msg->msg_iovlen = 1;
    msg->msg_control = cbuf;
    msg->msg_controllen = sizeof (*cmsg) + sizeof (*sri);
    msg->msg_flags =  0;

    memset(cbuf, 0, sizeof (*cmsg) + sizeof (*sri));
    cmsg = (struct cmsghdr *)cbuf;
    sri = (struct sctp_sndrcvinfo *)(cmsg + 1);

    cmsg->cmsg_len = sizeof (*cmsg) + sizeof (*sri);
    cmsg->cmsg_level = IPPROTO_SCTP;
    cmsg->cmsg_type  = SCTP_SNDRCV;

    sri->sinfo_ppid   = 1;
    /* Start sending to stream 0. */
    sri->sinfo_stream = 0;

    /* Create a thread to receive network traffic. */
    perr = pthread_create(&tid, NULL, (void *(*)(void *))readit, &fd);

    if (perr != 0) {
        fprintf(stderr, "pthread_create: %d\n", perr);
        exit(1);
    }

    /* Read from stdin and then send to the echo server. */
    while ((n = read(fileno(stdin), buf, BUFLEN)) > 0) {
        iov->iov_len = n;
        if (sendmsg(fd, msg, 0) < 0) {
            perror("sendmsg");
            exit(1);
        }
        /* Send the next message to a different stream. */
        sri->sinfo_stream = (sri->sinfo_stream + 1) % MAX_STREAM;
    }

    pthread_cancel(tid);
    close(fd);
}

int
main(int argc, char **argv)
{
    struct sockaddr_in addr[1];
    struct hostent *hp;
    int error;

    if (argc < 2) {
        usage(*argv);
        exit(1);
    }

    /* Find the host to connect to. */ 
    hp = getipnodebyname(argv[1], AF_INET, 0, &error);
    if (hp == NULL) {
        fprintf(stderr, "host not found\n");
        exit(1);
    }

    addr->sin_family = AF_INET;
    addr->sin_addr.s_addr = hp->h_addr_list[0];
    addr->sin_port = htons(5000);

    echo(addr);

    return (0);
}

Re: Error when build apps SCTP

[Wei Yongjun]

> Hi,my name Thanh Nguyen.Student of University of Science Ho Chi Minh
> City Viet Nam.I have one problem with SCTP API.
> I have source code one example client server SCTP. (Attach).But when
> build with gcc (using command gcc client.c -o client) was error as:
> "'union sctp_notification’ has no member named ‘sn_types’
> And I check struct sctp_notification but sn_types is member of this
> struct.Why error?
> If you have example same it, and paper abount SCTP API.Please send to
> me.Thanks a lot.
> Source example,I take it from Oracle example.Code server build ok.
> I have install LKSCTP, Fedora 13,GCC.  

It should be 'snp->sn_header.sn_type', not 'snp->sn_types'.

See the socket API: http://tools.ietf.org/html/draft-ietf-tsvwg-sctpsocket-27

Section 6.1.  SCTP Notification Structure

   union sctp_notification {
     struct sctp_tlv {
       uint16_t sn_type; /* Notification type. */
       uint16_t sn_flags;
       uint32_t sn_length;
     } sn_header;
     struct sctp_assoc_change sn_assoc_change;
     struct sctp_paddr_change sn_paddr_change;
     struct sctp_remote_error sn_remote_error;
     struct sctp_send_failed sn_send_failed;
     struct sctp_shutdown_event sn_shutdown_event;
     struct sctp_adaptation_event sn_adaptation_event;
     struct sctp_pdapi_event sn_pdapi_event;
     struct sctp_authkey_event sn_auth_event;
     struct sctp_sender_dry_event sn_sender_dry_event;
     struct sctp_send_failed_event sn_send_failed_event;
   };