src/OS/os.c-IRIX632

   1 /* $Cambridge: exim/src/OS/os.c-IRIX632,v 1.1 2004/10/06 15:07:39 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 2001 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10 /* Irix-specific code. This is concatenated onto the generic src/os.c file.
  11 Irix has a unique way of finding all the network interfaces, so we provide a
  12 unique function here, and define FIND_RUNNING_INTERFACES to stop src/os.c
  13 trying to provide the function. The macro may be set initially anyway, when
  14 compiling os. for utilities that don't want this function. */
  15
  16 #ifndef FIND_RUNNING_INTERFACES
  17 #define FIND_RUNNING_INTERFACES
  18
  19 /* This is the special form of the function using sysctl() which is the only
  20 form that returns all the aliases on IRIX systems. This code has its origins
  21 in a sample program that came from within SGI. */
  22
  23 #include <sys/sysctl.h>
  24 #include <net/if_dl.h>
  25 #include <net/if_types.h>
  26 #include <net/soioctl.h>
  27 #include <net/route.h>
  28
  29 #define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) -1))) \
  30                     : sizeof(__uint64_t))
  31 #ifdef _HAVE_SA_LEN
  32 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  33 #else
  34 #define ADVANCE(x, n) (x += ROUNDUP(_FAKE_SA_LEN_DST(n)))
  35 #endif
  36
  37
  38 ip_address_item *
  39 os_find_running_interfaces(void)
  40 {
  41 ip_address_item *yield = NULL;
  42 ip_address_item *last = NULL;
  43 ip_address_item *next;
  44
  45 size_t needed;
  46 int mib[6];
  47 char *buf, *nextaddr, *lim;
  48 register struct if_msghdr *ifm;
  49
  50 mib[0] = CTL_NET;
  51 mib[1] = PF_ROUTE;
  52 mib[2] = 0;
  53 mib[3] = 0;
  54 mib[4] = NET_RT_IFLIST;
  55 mib[5] = 0;
  56
  57 /* Get an estimate of the amount of store needed, then get the store and
  58 get the data into it. Any error causes a panic death. */
  59
  60 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
  61   log_write(0, LOG_PANIC_DIE, "iflist-sysctl-estimate failed: %s",
  62     strerror(errno));
  63
  64 buf = store_get(needed);
  65
  66 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
  67   log_write(0, LOG_PANIC_DIE, "sysctl of ifnet list failed: %s",
  68     strerror(errno));
  69
  70 /* Now fish out the data for each interface */
  71
  72 lim  = buf + needed;
  73 for (nextaddr = buf; nextaddr < lim; nextaddr += ifm->ifm_msglen)
  74   {
  75   ifm = (struct if_msghdr *)nextaddr;
  76
  77   if (ifm->ifm_type != RTM_IFINFO)
  78     {
  79     struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
  80     struct sockaddr_in *mask = NULL, *addr = NULL;
  81
  82     if ((ifam->ifam_addrs & RTA_NETMASK) != 0)
  83       mask = (struct sockaddr_in *)(ifam + 1);
  84
  85     if ((ifam->ifam_addrs & RTA_IFA) != 0)
  86       {
  87       char *cp = (char *)mask;
  88       struct sockaddr *sa = (struct sockaddr *)mask;
  89       ADVANCE(cp, sa);
  90       addr = (struct sockaddr_in *)cp;
  91       }
  92
  93     /* Create a data block for the address, fill in the data, and put it on
  94     the chain. This data has to survive for ever, so use malloc. */
  95
  96     if (addr != NULL)
  97       {
  98       next = store_malloc(sizeof(ip_address_item));
  99       next->next = NULL;
 100       next->port = 0;
 101       (void)host_ntoa(-1, addr, next->address, NULL);
 102
 103       if (yield == NULL) yield = last = next; else
 104         {
 105         last->next = next;
 106         last = next;
 107         }
 108
 109       DEBUG(D_interface) debug_printf("Actual local interface address is %s\n",
 110         last->address);
 111       }
 112     }
 113   }
 114
 115 return yield;
 116 }
 117
 118 #endif  /* FIND_RUNNING_INTERFACES */
 119
 120 /* End of os.c-IRIX */