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o There are cases when SIOCGIFINDEX is defined, but it doesn't work. When

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this happens, don't reject the whole interface, just mark it as index 0.
o  Removed Pavel's comment about EFAULT and SIGSEGV. EFAULT is a valid return
   code for cases where the buffer is too small.
o  Commented out the smart interface list size logic temporarily as it seems
   Linux 2.0 SIOCGIFCONF doesn't react to ifc_req==NULL sanely. Replaced it
   by exponential stepping.
This commit is contained in:
Martin Mares 1998-10-13 19:57:33 +00:00
parent fdf33cde1c
commit c93214d442
2 changed files with 13 additions and 7 deletions
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2
TODO
View File

@ -2,6 +2,8 @@ Core
~~~~
* router id
- use -freg-struct-return ?
- fake multipath?
- config file: symbolic constants?
- counters (according to SNMP MIB?)

18
sysdep/unix/sync-if.c
View File

@ -115,8 +115,9 @@ scan_ifs(struct ifreq *r, int cnt)
#ifdef SIOCGIFINDEX
if (ioctl(if_scan_sock, SIOCGIFINDEX, r) < 0)
{ err = "SIOCGIFINDEX"; goto faulty; }
i.index = r->ifr_ifindex;
DBG("SIOCGIFINDEX failed: %m\n");
else
i.index = r->ifr_ifindex;
#endif
if_update(&i);
@ -128,7 +129,7 @@ static void
scan_if(timer *t)
{
struct ifconf ic;
static int last_ifbuf_size;
static int last_ifbuf_size = 4*sizeof(struct ifreq);
int res;
DBG("Scanning interfaces...\n");
@ -140,7 +141,7 @@ scan_if(timer *t)
ic.ifc_ifcu.ifcu_req = r;
ic.ifc_len = last_ifbuf_size;
res = ioctl(if_scan_sock, SIOCGIFCONF, &ic);
if (res < 0 && errno != EFAULT) /* FIXME: I would sigsegv you if I were kernel at this point */
if (res < 0 && errno != EFAULT)
die("SIOCCGIFCONF: %m");
if (res < last_ifbuf_size)
{
@ -148,18 +149,21 @@ scan_if(timer *t)
break;
}
}
ic.ifc_ifcu.ifcu_req = NULL;
#ifdef CLEAN_WAY_WORKING_ONLY_ON_LINUX_2_1 /* FIXME */
ic.ifc_req = NULL;
ic.ifc_len = 999999999;
if (ioctl(if_scan_sock, SIOCGIFCONF, &ic) < 0)
die("SIOCIFCONF: %m");
if (ic.ifc_len > 100*1024)
die("Buf size MUCH too big: %d\n", ic.ifc_len);
ic.ifc_len += sizeof(struct ifreq);
if (last_ifbuf_size < ic.ifc_len)
{
last_ifbuf_size = ic.ifc_len;
DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
}
#else
last_ifbuf_size *= 2;
DBG("Increased ifconf buffer size to %d\n", last_ifbuf_size);
#endif
}
}