mdw@git.distorted.org.uk Git - qmail/blob - ipme.c

   1 #include <sys/types.h>
   2 #include <sys/param.h>
   3 #include <sys/time.h>
   4 #include <sys/ioctl.h>
   5 #include <sys/socket.h>
   6 #include <net/if.h>
   7 #include <netinet/in.h>
   8 #ifndef SIOCGIFCONF /* whatever works */
   9 #include <sys/sockio.h>
  10 #endif
  11 #include "hassalen.h"
  12 #include "byte.h"
  13 #include "ip.h"
  14 #include "ipalloc.h"
  15 #include "stralloc.h"
  16 #include "ipme.h"
  17
  18 static int ipmeok = 0;
  19 ipalloc ipme = {0};
  20
  21 int ipme_is(ip)
  22 struct ip_address *ip;
  23 {
  24   int i;
  25   if (ipme_init() != 1) return -1;
  26   for (i = 0;i < ipme.len;++i)
  27     if (byte_equal(&ipme.ix[i].ip,4,ip))
  28       return 1;
  29   return 0;
  30 }
  31
  32 static stralloc buf = {0};
  33
  34 int ipme_init()
  35 {
  36   struct ifconf ifc;
  37   char *x;
  38   struct ifreq *ifr;
  39   struct sockaddr_in *sin;
  40   int len;
  41   int s;
  42   struct ip_mx ix;
  43
  44   if (ipmeok) return 1;
  45   if (!ipalloc_readyplus(&ipme,0)) return 0;
  46   ipme.len = 0;
  47   ix.pref = 0;
  48
  49   if ((s = socket(AF_INET,SOCK_STREAM,0)) == -1) return -1;
  50
  51   len = 256;
  52   for (;;) {
  53     if (!stralloc_ready(&buf,len)) { close(s); return 0; }
  54     buf.len = 0;
  55     ifc.ifc_buf = buf.s;
  56     ifc.ifc_len = len;
  57     if (ioctl(s,SIOCGIFCONF,&ifc) >= 0) /* > is for System V */
  58       if (ifc.ifc_len + sizeof(*ifr) + 64 < len) { /* what a stupid interface */
  59         buf.len = ifc.ifc_len;
  60         break;
  61       }
  62     if (len > 200000) { close(s); return -1; }
  63     len += 100 + (len >> 2);
  64   }
  65   x = buf.s;
  66   while (x < buf.s + buf.len) {
  67     ifr = (struct ifreq *) x;
  68 #ifdef HASSALEN
  69     len = sizeof(ifr->ifr_name) + ifr->ifr_addr.sa_len;
  70     if (len < sizeof(*ifr))
  71       len = sizeof(*ifr);
  72     if (ifr->ifr_addr.sa_family == AF_INET) {
  73       sin = (struct sockaddr_in *) &ifr->ifr_addr;
  74       byte_copy(&ix.ip,4,&sin->sin_addr);
  75       if (ioctl(s,SIOCGIFFLAGS,x) == 0)
  76         if (ifr->ifr_flags & IFF_UP)
  77           if (!ipalloc_append(&ipme,&ix)) { close(s); return 0; }
  78     }
  79 #else
  80     len = sizeof(*ifr);
  81     if (ioctl(s,SIOCGIFFLAGS,x) == 0)
  82       if (ifr->ifr_flags & IFF_UP)
  83         if (ioctl(s,SIOCGIFADDR,x) == 0)
  84           if (ifr->ifr_addr.sa_family == AF_INET) {
  85             sin = (struct sockaddr_in *) &ifr->ifr_addr;
  86             byte_copy(&ix.ip,4,&sin->sin_addr);
  87             if (!ipalloc_append(&ipme,&ix)) { close(s); return 0; }
  88           }
  89 #endif
  90     x += len;
  91   }
  92   close(s);
  93   ipmeok = 1;
  94   return 1;
  95 }