Attempt at getting sctp_bindx to work

sctp_bindx_example.c

/*
sudo pkg install sctplib

I created two interfaces like so:

sudo ifconfig lo1 create
sudo ifconfig lo1 1.1.1.1/24 up
sudo ifconfig lo2 create
sudo ifconfig lo2 1.1.1.2/24 up

> ifconfig -a

lo1: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
	options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
	inet 1.1.1.1 netmask 0xffffff00
	inet6 fe80::1%lo1 prefixlen 64 scopeid 0x3
	groups: lo
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
lo2: flags=1008049<UP,LOOPBACK,RUNNING,MULTICAST,LOWER_UP> metric 0 mtu 16384
	options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
	inet 1.1.1.2 netmask 0xffffff00
	inet6 fe80::1%lo2 prefixlen 64 scopeid 0x4
	groups: lo
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
*/

#include <stdio.h>
#include <string.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/sctp.h>
#include <errno.h>
#include <unistd.h>

int main(){
  int fileno;
  int port = 62324;
  int domain = AF_INET;
  int sock_type = SOCK_SEQPACKET;
  int flag = SCTP_BINDX_ADD_ADDR;
  struct sockaddr_in addrs[2];
  char* ip1 = "1.1.1.1";
  char* ip2 = "1.1.1.2";

  bzero(&addrs, sizeof(addrs));

  fileno = socket(domain, sock_type, IPPROTO_SCTP);

  if(fileno < 0){
    printf("Socket creation failed\n");
    return -1;
  }

  addrs[0].sin_family = domain;
  addrs[0].sin_port = htons(port);
  addrs[0].sin_addr.s_addr = inet_addr(ip1);
  addrs[1].sin_family = domain;
  addrs[1].sin_port = htons(port);
  addrs[1].sin_addr.s_addr = inet_addr(ip2);
  
  // THIS FAILS, WHY?

  // Tried this
  /*
  if(sctp_bindx(fileno, (struct sockaddr*)addrs, 2, flag) != 0){
    printf("sctp_bindx 1 failed: %s\n", strerror(errno));
    return -1;
  }
  */

  // And also this
  if(sctp_bindx(fileno, (struct sockaddr*)&addrs[0], 1, flag) != 0){
    printf("sctp_bindx 1 failed: %s\n", strerror(errno));
    return -1;
  }

  if(sctp_bindx(fileno, (struct sockaddr*)&addrs[1], 1, flag) != 0){
    printf("sctp_bindx 2 failed: %s\n", strerror(errno));
    return -1;
  }

  close(fileno);

  return 0;
}