/* $Cambridge: exim/src/OS/os.c-IRIX632,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */

/*************************************************
*     Exim - an Internet mail transport agent    *
*************************************************/

/* Copyright (c) University of Cambridge 2001 */
/* See the file NOTICE for conditions of use and distribution. */

/* Irix-specific code. This is concatenated onto the generic src/os.c file.
Irix has a unique way of finding all the network interfaces, so we provide a
unique function here, and define FIND_RUNNING_INTERFACES to stop src/os.c
trying to provide the function. The macro may be set initially anyway, when
compiling os. for utilities that don't want this function. */

#ifndef FIND_RUNNING_INTERFACES
#define FIND_RUNNING_INTERFACES

/* This is the special form of the function using sysctl() which is the only
form that returns all the aliases on IRIX systems. This code has its origins
in a sample program that came from within SGI. */

#include <sys/sysctl.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/soioctl.h>
#include <net/route.h>

#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) -1))) \
                    : sizeof(__uint64_t))
#ifdef _HAVE_SA_LEN
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
#else
#define ADVANCE(x, n) (x += ROUNDUP(_FAKE_SA_LEN_DST(n)))
#endif


ip_address_item *
os_find_running_interfaces(void)
{
ip_address_item *yield = NULL;
ip_address_item *last = NULL;
ip_address_item *next;

size_t needed;
int mib[6];
char *buf, *nextaddr, *lim;
register struct if_msghdr *ifm;

mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
mib[2] = 0;
mib[3] = 0;
mib[4] = NET_RT_IFLIST;
mib[5] = 0;

/* Get an estimate of the amount of store needed, then get the store and
get the data into it. Any error causes a panic death. */

if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
  log_write(0, LOG_PANIC_DIE, "iflist-sysctl-estimate failed: %s",
    strerror(errno));

buf = store_get(needed);

if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
  log_write(0, LOG_PANIC_DIE, "sysctl of ifnet list failed: %s",
    strerror(errno));

/* Now fish out the data for each interface */

lim  = buf + needed;
for (nextaddr = buf; nextaddr < lim; nextaddr += ifm->ifm_msglen)
  {
  ifm = (struct if_msghdr *)nextaddr;

  if (ifm->ifm_type != RTM_IFINFO)
    {
    struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
    struct sockaddr_in *mask = NULL, *addr = NULL;

    if ((ifam->ifam_addrs & RTA_NETMASK) != 0)
      mask = (struct sockaddr_in *)(ifam + 1);

    if ((ifam->ifam_addrs & RTA_IFA) != 0)
      {
      char *cp = (char *)mask;
      struct sockaddr *sa = (struct sockaddr *)mask;
      ADVANCE(cp, sa);
      addr = (struct sockaddr_in *)cp;
      }

    /* Create a data block for the address, fill in the data, and put it on
    the chain. This data has to survive for ever, so use malloc. */

    if (addr != NULL)
      {
      next = store_malloc(sizeof(ip_address_item));
      next->next = NULL;
      next->port = 0;
      (void)host_ntoa(-1, addr, next->address, NULL);

      if (yield == NULL) yield = last = next; else
        {
        last->next = next;
        last = next;
        }

      DEBUG(D_interface) debug_printf("Actual local interface address is %s\n",
        last->address);
      }
    }
  }

return yield;
}

#endif  /* FIND_RUNNING_INTERFACES */

/* End of os.c-IRIX */