mir/bind
2
0
Fork 0
mirror of https://gitlab.isc.org/isc-projects/bind9 synced 2025-08-29 21:47:59 +00:00
Code Issues Releases Wiki Activity

1205. [func] lwres: probe the system to see what address families

Browse Source 
are currently in use.
This commit is contained in:
Mark Andrews 2002-05-27 06:54:48 +00:00
parent c8aa2c8311
commit bdb1394788
3 changed files with 211 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
CHANGES
View File

@ -1,3 +1,6 @@
1205. [func] lwres: probe the system to see what address families
are currently in use.
1204. [bug] The RTT estimate on unused servers was not aged. 1204. [bug] The RTT estimate on unused servers was not aged.
[RT #2569] [RT #2569]

230
lib/lwres/getipnode.c
View File

@ -15,13 +15,14 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/ */
/* $Id: getipnode.c,v 1.32 2001/11/27 01:56:28 gson Exp $ */ /* $Id: getipnode.c,v 1.33 2002/05/27 06:54:46 marka Exp $ */
#include <config.h> #include <config.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <errno.h>
#include <lwres/lwres.h> #include <lwres/lwres.h>
#include <lwres/net.h> #include <lwres/net.h>
@ -373,19 +374,194 @@ lwres_freehostent(struct hostent *he) {
* -1 on failure. * -1 on failure.
*/ */
#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR) && \
!defined(IRIX_EMUL_IOCTL_SIOCGIFCONF)
#ifdef __hpux
#define lifc_len iflc_len
#define lifc_buf iflc_buf
#define lifc_req iflc_req
#define LIFCONF if_laddrconf
#else
#define ISC_HAVE_LIFC_FAMILY 1
#define ISC_HAVE_LIFC_FLAGS 1
#define LIFCONF lifconf
#endif
#ifdef __hpux
#define lifr_addr iflr_addr
#define lifr_name iflr_name
#define lifr_dstaddr iflr_dstaddr
#define lifr_flags iflr_flags
#define ss_family sa_family
#define LIFREQ if_laddrreq
#else
#define LIFREQ lifreq
#endif
static int
scan_interfaces6(int *have_v4, int *have_v6) {
struct LIFCONF lifc;
struct LIFREQ lifreq;
struct in_addr in4;
struct in6_addr in6;
char *buf = NULL, *cp, *cplim;
static unsigned int bufsiz = 4095;
int s, cpsize, n;
/*
* Set to zero. Used as loop terminators below.
*/
*have_v4 = *have_v6 = 0;
/*
* Get interface list from system.
*/
if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) == -1)
goto err_ret;
/*
* Grow buffer until large enough to contain all interface
* descriptions.
*/
for (;;) {
buf = malloc(bufsiz);
if (buf == NULL)
goto err_ret;
#ifdef ISC_HAVE_LIFC_FAMILY
lifc.lifc_family = AF_UNSPEC; /* request all families */
#endif
#ifdef ISC_HAVE_LIFC_FLAGS
lifc.lifc_flags = 0;
#endif
lifc.lifc_len = bufsiz;
lifc.lifc_buf = buf;
if ((n = ioctl(s, SIOCGLIFCONF, (char *)&lifc)) != -1) {
/*
* Some OS's just return what will fit rather
* than set EINVAL if the buffer is too small
* to fit all the interfaces in. If
* lifc.lifc_len is too near to the end of the
* buffer we will grow it just in case and
* retry.
*/
if (lifc.lifc_len + 2 * sizeof(lifreq) < bufsiz)
break;
}
if ((n == -1) && errno != EINVAL)
goto err_ret;
if (bufsiz > 1000000)
goto err_ret;
free(buf);
bufsiz += 4096;
}
/*
* Parse system's interface list.
*/
cplim = buf + lifc.lifc_len; /* skip over if's with big ifr_addr's */
for (cp = buf;
(*have_v4 == 0 || *have_v6 == 0) && cp < cplim;
cp += cpsize) {
memcpy(&lifreq, cp, sizeof(lifreq));
#ifdef LWRES_PLATFORM_HAVESALEN
#ifdef FIX_ZERO_SA_LEN
if (lifreq.lifr_addr.sa_len == 0)
lifreq.lifr_addr.sa_len = 16;
#endif
#ifdef HAVE_MINIMUM_IFREQ
cpsize = sizeof(lifreq);
if (lifreq.lifr_addr.sa_len > sizeof(struct sockaddr))
cpsize += (int)lifreq.lifr_addr.sa_len -
(int)(sizeof(struct sockaddr));
#else
cpsize = sizeof(lifreq.lifr_name) + lifreq.lifr_addr.sa_len;
#endif /* HAVE_MINIMUM_IFREQ */
#elif defined SIOCGIFCONF_ADDR
cpsize = sizeof(lifreq);
#else
cpsize = sizeof(lifreq.lifr_name);
/* XXX maybe this should be a hard error? */
if (ioctl(s, SIOCGLIFADDR, (char *)&lifreq) < 0)
continue;
#endif
switch (lifreq.lifr_addr.ss_family) {
case AF_INET:
if (*have_v4 == 0) {
memcpy(&in4,
&((struct sockaddr_in *)
&lifreq.lifr_addr)->sin_addr,
sizeof(in4));
if (in4.s_addr == INADDR_ANY)
break;
n = ioctl(s, SIOCGLIFFLAGS, (char *)&lifreq);
if (n < 0)
break;
if ((lifreq.lifr_flags & IFF_UP) == 0)
break;
*have_v4 = 1;
}
break;
case AF_INET6:
if (*have_v6 == 0) {
memcpy(&in6,
&((struct sockaddr_in6 *)
&lifreq.lifr_addr)->sin6_addr,
sizeof(in6));
if (memcmp(&in6, &in6addr_any,
sizeof(in6)) == 0)
break;
n = ioctl(s, SIOCGLIFFLAGS, (char *)&lifreq);
if (n < 0)
break;
if ((lifreq.lifr_flags & IFF_UP) == 0)
break;
*have_v6 = 1;
}
break;
}
}
if (buf != NULL)
free(buf);
close(s);
return (0);
err_ret:
if (buf != NULL)
free(buf);
if (s != -1)
close(s);
return (-1);
}
#endif
static int static int
scan_interfaces(int *have_v4, int *have_v6) { scan_interfaces(int *have_v4, int *have_v6) {
#if 1 #if !defined(SIOCGIFCONF) || !defined(SIOCGIFADDR)
*have_v4 = *have_v6 = 1; *have_v4 = *have_v6 = 1;
return (0); return (0);
#else #else
struct ifconf ifc; struct ifconf ifc;
struct ifreq ifreq; union {
char _pad[256]; /* leave space for IPv6 addresses */
struct ifreq ifreq;
} u;
struct in_addr in4; struct in_addr in4;
struct in6_addr in6; struct in6_addr in6;
char *buf = NULL, *cp, *cplim; char *buf = NULL, *cp, *cplim;
static int bufsiz = 4095; static unsigned int bufsiz = 4095;
int s, cpsize, n; int s, n;
size_t cpsize;
#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR) && \
!defined(IRIX_EMUL_IOCTL_SIOCGIFCONF)
/*
* Try to scan the interfaces using IPv6 ioctls().
*/
if (!scan_interfaces6(have_v4, have_v6))
return (0);
#endif
/* /*
* Set to zero. Used as loop terminators below. * Set to zero. Used as loop terminators below.
@ -421,12 +597,12 @@ scan_interfaces(int *have_v4, int *have_v6) {
/* /*
* Some OS's just return what will fit rather * Some OS's just return what will fit rather
* than set EINVAL if the buffer is too small * than set EINVAL if the buffer is too small
* to fit all the interfaces in. If * to fit all the interfaces in. If
* ifc.ifc_len is too near to the end of the * ifc.ifc_len is too near to the end of the
* buffer we will grow it just in case and * buffer we will grow it just in case and
* retry. * retry.
*/ */
if (ifc.ifc_len + 2 * sizeof(ifreq) < bufsiz) if (ifc.ifc_len + 2 * sizeof(u.ifreq) < bufsiz)
break; break;
} }
#endif #endif
@ -447,58 +623,60 @@ scan_interfaces(int *have_v4, int *have_v6) {
for (cp = buf; for (cp = buf;
(*have_v4 == 0 || *have_v6 == 0) && cp < cplim; (*have_v4 == 0 || *have_v6 == 0) && cp < cplim;
cp += cpsize) { cp += cpsize) {
memcpy(&ifreq, cp, sizeof(ifreq)); memcpy(&u.ifreq, cp, sizeof(u.ifreq));
#ifdef LWRES_PLATFORM_HAVESALEN #ifdef LWRES_PLATFORM_HAVESALEN
#ifdef FIX_ZERO_SA_LEN #ifdef FIX_ZERO_SA_LEN
if (ifreq.ifr_addr.sa_len == 0) if (u.ifreq.ifr_addr.sa_len == 0)
ifreq.ifr_addr.sa_len = IN6ADDRSZ; u.ifreq.ifr_addr.sa_len = 16;
#endif #endif
#ifdef HAVE_MINIMUM_IFREQ #ifdef HAVE_MINIMUM_IFREQ
cpsize = sizeof(ifreq); cpsize = sizeof(u.ifreq);
if (ifreq.ifr_addr.sa_len > sizeof(struct sockaddr)) if (u.ifreq.ifr_addr.sa_len > sizeof(struct sockaddr))
cpsize += (int)ifreq.ifr_addr.sa_len - cpsize += (int)u.ifreq.ifr_addr.sa_len -
(int)(sizeof(struct sockaddr)); (int)(sizeof(struct sockaddr));
#else #else
cpsize = sizeof(ifreq.ifr_name) + ifreq.ifr_addr.sa_len; cpsize = sizeof(u.ifreq.ifr_name) + u.ifreq.ifr_addr.sa_len;
#endif /* HAVE_MINIMUM_IFREQ */ #endif /* HAVE_MINIMUM_IFREQ */
if (cpsize > sizeof(u.ifreq) && cpsize <= sizeof(u))
memcpy(&u.ifreq, cp, cpsize);
#elif defined SIOCGIFCONF_ADDR #elif defined SIOCGIFCONF_ADDR
cpsize = sizeof(ifreq); cpsize = sizeof(u.ifreq);
#else #else
cpsize = sizeof(ifreq.ifr_name); cpsize = sizeof(u.ifreq.ifr_name);
/* XXX maybe this should be a hard error? */ /* XXX maybe this should be a hard error? */
if (ioctl(s, SIOCGIFADDR, (char *)&ifreq) < 0) if (ioctl(s, SIOCGIFADDR, (char *)&u.ifreq) < 0)
continue; continue;
#endif /* LWRES_PLATFORM_HAVESALEN */ #endif
switch (ifreq.ifr_addr.sa_family) { switch (u.ifreq.ifr_addr.sa_family) {
case AF_INET: case AF_INET:
if (*have_v4 == 0) { if (*have_v4 == 0) {
memcpy(&in4, memcpy(&in4,
&((struct sockaddr_in *) &((struct sockaddr_in *)
&ifreq.ifr_addr)->sin_addr, &u.ifreq.ifr_addr)->sin_addr,
sizeof(in4)); sizeof(in4));
if (in4.s_addr == INADDR_ANY) if (in4.s_addr == INADDR_ANY)
break; break;
n = ioctl(s, SIOCGIFFLAGS, (char *)&ifreq); n = ioctl(s, SIOCGIFFLAGS, (char *)&u.ifreq);
if (n < 0) if (n < 0)
break; break;
if ((ifreq.ifr_flags & IFF_UP) == 0) if ((u.ifreq.ifr_flags & IFF_UP) == 0)
break; break;
*have_v4 = 1; *have_v4 = 1;
} }
break; break;
case AF_INET6: case AF_INET6:
if (*have_v6 == 0) { if (*have_v6 == 0) {
memcpy(&in6, memcpy(&in6,
&((struct sockaddr_in6 *) &((struct sockaddr_in6 *)
&ifreq.ifr_addr)->sin6_addr, &u.ifreq.ifr_addr)->sin6_addr,
sizeof(in6)); sizeof(in6));
if (memcmp(&in6, &in6addr_any, if (memcmp(&in6, &in6addr_any,
sizeof(in6)) == 0) sizeof(in6)) == 0)
break; break;
n = ioctl(s, SIOCGIFFLAGS, (char *)&ifreq); n = ioctl(s, SIOCGIFFLAGS, (char *)&u.ifreq);
if (n < 0) if (n < 0)
break; break;
if ((ifreq.ifr_flags & IFF_UP) == 0) if ((u.ifreq.ifr_flags & IFF_UP) == 0)
break; break;
*have_v6 = 1; *have_v6 = 1;
} }

5
lib/lwres/unix/include/lwres/net.h
View File

@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/ */
/* $Id: net.h,v 1.3 2001/07/10 23:38:44 bwelling Exp $ */ /* $Id: net.h,v 1.4 2002/05/27 06:54:48 marka Exp $ */
#ifndef LWRES_NET_H #ifndef LWRES_NET_H
#define LWRES_NET_H 1 #define LWRES_NET_H 1
@ -52,8 +52,10 @@
#include <lwres/platform.h> /* Required for LWRES_PLATFORM_*. */ #include <lwres/platform.h> /* Required for LWRES_PLATFORM_*. */
#include <unistd.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/socket.h> /* Contractual promise. */ #include <sys/socket.h> /* Contractual promise. */
#include <sys/ioctl.h>
#include <sys/time.h> #include <sys/time.h>
#include <sys/un.h> #include <sys/un.h>
@ -65,6 +67,7 @@
#ifdef LWRES_PLATFORM_NEEDNETINET6IN6H #ifdef LWRES_PLATFORM_NEEDNETINET6IN6H
#include <netinet6/in6.h> /* Required on BSD/OS for in6_pktinfo. */ #include <netinet6/in6.h> /* Required on BSD/OS for in6_pktinfo. */
#endif #endif
#include <net/if.h>
#include <lwres/lang.h> #include <lwres/lang.h>