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https://gitlab.isc.org/isc-projects/bind9
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1205. [func] lwres: probe the system to see what address families
are currently in use.
This commit is contained in:
Mark Andrews
parent
c8aa2c8311
commit
bdb1394788
3
CHANGES
3
CHANGES
@ -1,3 +1,6 @@
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1205. [func] lwres: probe the system to see what address families
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are currently in use.
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1204. [bug] The RTT estimate on unused servers was not aged.
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[RT #2569]
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@ -15,13 +15,14 @@
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: getipnode.c,v 1.32 2001/11/27 01:56:28 gson Exp $ */
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/* $Id: getipnode.c,v 1.33 2002/05/27 06:54:46 marka Exp $ */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <lwres/lwres.h>
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#include <lwres/net.h>
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@ -373,19 +374,194 @@ lwres_freehostent(struct hostent *he) {
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* -1 on failure.
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*/
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#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR) && \
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!defined(IRIX_EMUL_IOCTL_SIOCGIFCONF)
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#ifdef __hpux
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#define lifc_len iflc_len
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#define lifc_buf iflc_buf
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#define lifc_req iflc_req
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#define LIFCONF if_laddrconf
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#else
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#define ISC_HAVE_LIFC_FAMILY 1
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#define ISC_HAVE_LIFC_FLAGS 1
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#define LIFCONF lifconf
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#endif
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#ifdef __hpux
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#define lifr_addr iflr_addr
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#define lifr_name iflr_name
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#define lifr_dstaddr iflr_dstaddr
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#define lifr_flags iflr_flags
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#define ss_family sa_family
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#define LIFREQ if_laddrreq
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#else
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#define LIFREQ lifreq
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#endif
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static int
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scan_interfaces6(int *have_v4, int *have_v6) {
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struct LIFCONF lifc;
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struct LIFREQ lifreq;
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struct in_addr in4;
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struct in6_addr in6;
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char *buf = NULL, *cp, *cplim;
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static unsigned int bufsiz = 4095;
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int s, cpsize, n;
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/*
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* Set to zero. Used as loop terminators below.
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*/
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*have_v4 = *have_v6 = 0;
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/*
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* Get interface list from system.
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*/
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if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) == -1)
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goto err_ret;
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/*
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* Grow buffer until large enough to contain all interface
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* descriptions.
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*/
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for (;;) {
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buf = malloc(bufsiz);
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if (buf == NULL)
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goto err_ret;
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#ifdef ISC_HAVE_LIFC_FAMILY
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lifc.lifc_family = AF_UNSPEC; /* request all families */
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#endif
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#ifdef ISC_HAVE_LIFC_FLAGS
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lifc.lifc_flags = 0;
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#endif
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lifc.lifc_len = bufsiz;
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lifc.lifc_buf = buf;
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if ((n = ioctl(s, SIOCGLIFCONF, (char *)&lifc)) != -1) {
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/*
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* Some OS's just return what will fit rather
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* than set EINVAL if the buffer is too small
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* to fit all the interfaces in. If
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* lifc.lifc_len is too near to the end of the
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* buffer we will grow it just in case and
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* retry.
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*/
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if (lifc.lifc_len + 2 * sizeof(lifreq) < bufsiz)
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break;
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}
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if ((n == -1) && errno != EINVAL)
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goto err_ret;
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if (bufsiz > 1000000)
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goto err_ret;
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free(buf);
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bufsiz += 4096;
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}
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/*
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* Parse system's interface list.
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*/
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cplim = buf + lifc.lifc_len; /* skip over if's with big ifr_addr's */
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for (cp = buf;
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(*have_v4 == 0 || *have_v6 == 0) && cp < cplim;
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cp += cpsize) {
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memcpy(&lifreq, cp, sizeof(lifreq));
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#ifdef LWRES_PLATFORM_HAVESALEN
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#ifdef FIX_ZERO_SA_LEN
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if (lifreq.lifr_addr.sa_len == 0)
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lifreq.lifr_addr.sa_len = 16;
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#endif
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#ifdef HAVE_MINIMUM_IFREQ
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cpsize = sizeof(lifreq);
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if (lifreq.lifr_addr.sa_len > sizeof(struct sockaddr))
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cpsize += (int)lifreq.lifr_addr.sa_len -
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(int)(sizeof(struct sockaddr));
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#else
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cpsize = sizeof(lifreq.lifr_name) + lifreq.lifr_addr.sa_len;
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#endif /* HAVE_MINIMUM_IFREQ */
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#elif defined SIOCGIFCONF_ADDR
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cpsize = sizeof(lifreq);
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#else
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cpsize = sizeof(lifreq.lifr_name);
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/* XXX maybe this should be a hard error? */
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if (ioctl(s, SIOCGLIFADDR, (char *)&lifreq) < 0)
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continue;
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#endif
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switch (lifreq.lifr_addr.ss_family) {
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case AF_INET:
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if (*have_v4 == 0) {
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memcpy(&in4,
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&((struct sockaddr_in *)
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&lifreq.lifr_addr)->sin_addr,
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sizeof(in4));
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if (in4.s_addr == INADDR_ANY)
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break;
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n = ioctl(s, SIOCGLIFFLAGS, (char *)&lifreq);
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if (n < 0)
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break;
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if ((lifreq.lifr_flags & IFF_UP) == 0)
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break;
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*have_v4 = 1;
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}
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break;
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case AF_INET6:
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if (*have_v6 == 0) {
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memcpy(&in6,
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&((struct sockaddr_in6 *)
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&lifreq.lifr_addr)->sin6_addr,
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sizeof(in6));
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if (memcmp(&in6, &in6addr_any,
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sizeof(in6)) == 0)
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break;
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n = ioctl(s, SIOCGLIFFLAGS, (char *)&lifreq);
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if (n < 0)
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break;
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if ((lifreq.lifr_flags & IFF_UP) == 0)
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break;
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*have_v6 = 1;
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}
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break;
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}
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}
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if (buf != NULL)
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free(buf);
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close(s);
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return (0);
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err_ret:
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if (buf != NULL)
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free(buf);
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if (s != -1)
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close(s);
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return (-1);
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}
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#endif
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static int
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scan_interfaces(int *have_v4, int *have_v6) {
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#if 1
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#if !defined(SIOCGIFCONF) || !defined(SIOCGIFADDR)
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*have_v4 = *have_v6 = 1;
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return (0);
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#else
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struct ifconf ifc;
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union {
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char _pad[256]; /* leave space for IPv6 addresses */
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struct ifreq ifreq;
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} u;
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struct in_addr in4;
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struct in6_addr in6;
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char *buf = NULL, *cp, *cplim;
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static int bufsiz = 4095;
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int s, cpsize, n;
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static unsigned int bufsiz = 4095;
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int s, n;
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size_t cpsize;
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#if defined(SIOCGLIFCONF) && defined(SIOCGLIFADDR) && \
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!defined(IRIX_EMUL_IOCTL_SIOCGIFCONF)
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/*
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* Try to scan the interfaces using IPv6 ioctls().
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*/
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if (!scan_interfaces6(have_v4, have_v6))
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return (0);
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#endif
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/*
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* Set to zero. Used as loop terminators below.
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@ -426,7 +602,7 @@ scan_interfaces(int *have_v4, int *have_v6) {
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* buffer we will grow it just in case and
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* retry.
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*/
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if (ifc.ifc_len + 2 * sizeof(ifreq) < bufsiz)
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if (ifc.ifc_len + 2 * sizeof(u.ifreq) < bufsiz)
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break;
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}
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#endif
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@ -447,41 +623,43 @@ scan_interfaces(int *have_v4, int *have_v6) {
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for (cp = buf;
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(*have_v4 == 0 || *have_v6 == 0) && cp < cplim;
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cp += cpsize) {
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memcpy(&ifreq, cp, sizeof(ifreq));
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memcpy(&u.ifreq, cp, sizeof(u.ifreq));
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#ifdef LWRES_PLATFORM_HAVESALEN
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#ifdef FIX_ZERO_SA_LEN
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if (ifreq.ifr_addr.sa_len == 0)
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ifreq.ifr_addr.sa_len = IN6ADDRSZ;
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if (u.ifreq.ifr_addr.sa_len == 0)
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u.ifreq.ifr_addr.sa_len = 16;
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#endif
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#ifdef HAVE_MINIMUM_IFREQ
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cpsize = sizeof(ifreq);
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if (ifreq.ifr_addr.sa_len > sizeof(struct sockaddr))
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cpsize += (int)ifreq.ifr_addr.sa_len -
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cpsize = sizeof(u.ifreq);
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if (u.ifreq.ifr_addr.sa_len > sizeof(struct sockaddr))
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cpsize += (int)u.ifreq.ifr_addr.sa_len -
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(int)(sizeof(struct sockaddr));
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#else
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cpsize = sizeof(ifreq.ifr_name) + ifreq.ifr_addr.sa_len;
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cpsize = sizeof(u.ifreq.ifr_name) + u.ifreq.ifr_addr.sa_len;
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#endif /* HAVE_MINIMUM_IFREQ */
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if (cpsize > sizeof(u.ifreq) && cpsize <= sizeof(u))
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memcpy(&u.ifreq, cp, cpsize);
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#elif defined SIOCGIFCONF_ADDR
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cpsize = sizeof(ifreq);
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cpsize = sizeof(u.ifreq);
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#else
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cpsize = sizeof(ifreq.ifr_name);
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cpsize = sizeof(u.ifreq.ifr_name);
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/* XXX maybe this should be a hard error? */
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if (ioctl(s, SIOCGIFADDR, (char *)&ifreq) < 0)
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if (ioctl(s, SIOCGIFADDR, (char *)&u.ifreq) < 0)
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continue;
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#endif /* LWRES_PLATFORM_HAVESALEN */
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switch (ifreq.ifr_addr.sa_family) {
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#endif
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switch (u.ifreq.ifr_addr.sa_family) {
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case AF_INET:
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if (*have_v4 == 0) {
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memcpy(&in4,
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&((struct sockaddr_in *)
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&ifreq.ifr_addr)->sin_addr,
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&u.ifreq.ifr_addr)->sin_addr,
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sizeof(in4));
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if (in4.s_addr == INADDR_ANY)
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break;
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n = ioctl(s, SIOCGIFFLAGS, (char *)&ifreq);
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n = ioctl(s, SIOCGIFFLAGS, (char *)&u.ifreq);
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if (n < 0)
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break;
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if ((ifreq.ifr_flags & IFF_UP) == 0)
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if ((u.ifreq.ifr_flags & IFF_UP) == 0)
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break;
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*have_v4 = 1;
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}
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@ -490,15 +668,15 @@ scan_interfaces(int *have_v4, int *have_v6) {
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if (*have_v6 == 0) {
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memcpy(&in6,
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&((struct sockaddr_in6 *)
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&ifreq.ifr_addr)->sin6_addr,
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&u.ifreq.ifr_addr)->sin6_addr,
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sizeof(in6));
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if (memcmp(&in6, &in6addr_any,
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sizeof(in6)) == 0)
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break;
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n = ioctl(s, SIOCGIFFLAGS, (char *)&ifreq);
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n = ioctl(s, SIOCGIFFLAGS, (char *)&u.ifreq);
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if (n < 0)
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break;
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if ((ifreq.ifr_flags & IFF_UP) == 0)
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if ((u.ifreq.ifr_flags & IFF_UP) == 0)
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break;
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*have_v6 = 1;
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}
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@ -15,7 +15,7 @@
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: net.h,v 1.3 2001/07/10 23:38:44 bwelling Exp $ */
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/* $Id: net.h,v 1.4 2002/05/27 06:54:48 marka Exp $ */
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#ifndef LWRES_NET_H
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#define LWRES_NET_H 1
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@ -52,8 +52,10 @@
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#include <lwres/platform.h> /* Required for LWRES_PLATFORM_*. */
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h> /* Contractual promise. */
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/un.h>
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@ -65,6 +67,7 @@
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#ifdef LWRES_PLATFORM_NEEDNETINET6IN6H
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#include <netinet6/in6.h> /* Required on BSD/OS for in6_pktinfo. */
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#endif
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#include <net/if.h>
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#include <lwres/lang.h>
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