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-rw-r--r--lib/isc/unix/ifiter_sysctl.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/lib/isc/unix/ifiter_sysctl.c b/lib/isc/unix/ifiter_sysctl.c
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index 0000000..9d5bf6d
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+++ b/lib/isc/unix/ifiter_sysctl.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 1999-2003 Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: ifiter_sysctl.c,v 1.25 2007/06/19 23:47:18 tbox Exp $ */
+
+/*! \file
+ * \brief
+ * Obtain the list of network interfaces using sysctl.
+ * See TCP/IP Illustrated Volume 2, sections 19.8, 19.14,
+ * and 19.16.
+ */
+
+#include <sys/param.h>
+#include <sys/sysctl.h>
+
+#include <net/route.h>
+#include <net/if_dl.h>
+
+/* XXX what about Alpha? */
+#ifdef sgi
+#define ROUNDUP(a) ((a) > 0 ? \
+ (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) : \
+ sizeof(__uint64_t))
+#else
+#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
+ : sizeof(long))
+#endif
+
+#define IFITER_MAGIC ISC_MAGIC('I', 'F', 'I', 'S')
+#define VALID_IFITER(t) ISC_MAGIC_VALID(t, IFITER_MAGIC)
+
+struct isc_interfaceiter {
+ unsigned int magic; /* Magic number. */
+ isc_mem_t *mctx;
+ void *buf; /* Buffer for sysctl data. */
+ unsigned int bufsize; /* Bytes allocated. */
+ unsigned int bufused; /* Bytes used. */
+ unsigned int pos; /* Current offset in
+ sysctl data. */
+ isc_interface_t current; /* Current interface data. */
+ isc_result_t result; /* Last result code. */
+};
+
+static int mib[6] = {
+ CTL_NET,
+ PF_ROUTE,
+ 0,
+ 0, /* Any address family. */
+ NET_RT_IFLIST,
+ 0 /* Flags. */
+};
+
+isc_result_t
+isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) {
+ isc_interfaceiter_t *iter;
+ isc_result_t result;
+ size_t bufsize;
+ size_t bufused;
+ char strbuf[ISC_STRERRORSIZE];
+
+ REQUIRE(mctx != NULL);
+ REQUIRE(iterp != NULL);
+ REQUIRE(*iterp == NULL);
+
+ iter = isc_mem_get(mctx, sizeof(*iter));
+ if (iter == NULL)
+ return (ISC_R_NOMEMORY);
+
+ iter->mctx = mctx;
+ iter->buf = 0;
+
+ /*
+ * Determine the amount of memory needed.
+ */
+ bufsize = 0;
+ if (sysctl(mib, 6, NULL, &bufsize, NULL, (size_t) 0) < 0) {
+ isc__strerror(errno, strbuf, sizeof(strbuf));
+ UNEXPECTED_ERROR(__FILE__, __LINE__,
+ isc_msgcat_get(isc_msgcat,
+ ISC_MSGSET_IFITERSYSCTL,
+ ISC_MSG_GETIFLISTSIZE,
+ "getting interface "
+ "list size: sysctl: %s"),
+ strbuf);
+ result = ISC_R_UNEXPECTED;
+ goto failure;
+ }
+ iter->bufsize = bufsize;
+
+ iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
+ if (iter->buf == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto failure;
+ }
+
+ bufused = bufsize;
+ if (sysctl(mib, 6, iter->buf, &bufused, NULL, (size_t) 0) < 0) {
+ isc__strerror(errno, strbuf, sizeof(strbuf));
+ UNEXPECTED_ERROR(__FILE__, __LINE__,
+ isc_msgcat_get(isc_msgcat,
+ ISC_MSGSET_IFITERSYSCTL,
+ ISC_MSG_GETIFLIST,
+ "getting interface list: "
+ "sysctl: %s"),
+ strbuf);
+ result = ISC_R_UNEXPECTED;
+ goto failure;
+ }
+ iter->bufused = bufused;
+ INSIST(iter->bufused <= iter->bufsize);
+
+ /*
+ * A newly created iterator has an undefined position
+ * until isc_interfaceiter_first() is called.
+ */
+ iter->pos = (unsigned int) -1;
+ iter->result = ISC_R_FAILURE;
+
+ iter->magic = IFITER_MAGIC;
+ *iterp = iter;
+ return (ISC_R_SUCCESS);
+
+ failure:
+ if (iter->buf != NULL)
+ isc_mem_put(mctx, iter->buf, iter->bufsize);
+ isc_mem_put(mctx, iter, sizeof(*iter));
+ return (result);
+}
+
+/*
+ * Get information about the current interface to iter->current.
+ * If successful, return ISC_R_SUCCESS.
+ * If the interface has an unsupported address family,
+ * return ISC_R_IGNORE. In case of other failure,
+ * return ISC_R_UNEXPECTED.
+ */
+
+static isc_result_t
+internal_current(isc_interfaceiter_t *iter) {
+ struct ifa_msghdr *ifam, *ifam_end;
+
+ REQUIRE(VALID_IFITER(iter));
+ REQUIRE (iter->pos < (unsigned int) iter->bufused);
+
+ ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
+ ifam_end = (struct ifa_msghdr *) ((char *) iter->buf + iter->bufused);
+
+ if (ifam->ifam_type == RTM_IFINFO) {
+ struct if_msghdr *ifm = (struct if_msghdr *) ifam;
+ struct sockaddr_dl *sdl = (struct sockaddr_dl *) (ifm + 1);
+ unsigned int namelen;
+
+ memset(&iter->current, 0, sizeof(iter->current));
+
+ namelen = sdl->sdl_nlen;
+ if (namelen > sizeof(iter->current.name) - 1)
+ namelen = sizeof(iter->current.name) - 1;
+
+ memset(iter->current.name, 0, sizeof(iter->current.name));
+ memcpy(iter->current.name, sdl->sdl_data, namelen);
+
+ iter->current.flags = 0;
+
+ if ((ifam->ifam_flags & IFF_UP) != 0)
+ iter->current.flags |= INTERFACE_F_UP;
+
+ if ((ifam->ifam_flags & IFF_POINTOPOINT) != 0)
+ iter->current.flags |= INTERFACE_F_POINTTOPOINT;
+
+ if ((ifam->ifam_flags & IFF_LOOPBACK) != 0)
+ iter->current.flags |= INTERFACE_F_LOOPBACK;
+
+ /*
+ * This is not an interface address.
+ * Force another iteration.
+ */
+ return (ISC_R_IGNORE);
+ } else if (ifam->ifam_type == RTM_NEWADDR) {
+ int i;
+ int family;
+ struct sockaddr *mask_sa = NULL;
+ struct sockaddr *addr_sa = NULL;
+ struct sockaddr *dst_sa = NULL;
+
+ struct sockaddr *sa = (struct sockaddr *)(ifam + 1);
+ family = sa->sa_family;
+
+ for (i = 0; i < RTAX_MAX; i++)
+ {
+ if ((ifam->ifam_addrs & (1 << i)) == 0)
+ continue;
+
+ INSIST(sa < (struct sockaddr *) ifam_end);
+
+ switch (i) {
+ case RTAX_NETMASK: /* Netmask */
+ mask_sa = sa;
+ break;
+ case RTAX_IFA: /* Interface address */
+ addr_sa = sa;
+ break;
+ case RTAX_BRD: /* Broadcast or destination address */
+ dst_sa = sa;
+ break;
+ }
+#ifdef ISC_PLATFORM_HAVESALEN
+ sa = (struct sockaddr *)((char*)(sa)
+ + ROUNDUP(sa->sa_len));
+#else
+#ifdef sgi
+ /*
+ * Do as the contributed SGI code does.
+ */
+ sa = (struct sockaddr *)((char*)(sa)
+ + ROUNDUP(_FAKE_SA_LEN_DST(sa)));
+#else
+ /* XXX untested. */
+ sa = (struct sockaddr *)((char*)(sa)
+ + ROUNDUP(sizeof(struct sockaddr)));
+#endif
+#endif
+ }
+
+ if (addr_sa == NULL)
+ return (ISC_R_IGNORE);
+
+ family = addr_sa->sa_family;
+ if (family != AF_INET && family != AF_INET6)
+ return (ISC_R_IGNORE);
+
+ iter->current.af = family;
+
+ get_addr(family, &iter->current.address, addr_sa,
+ iter->current.name);
+
+ if (mask_sa != NULL)
+ get_addr(family, &iter->current.netmask, mask_sa,
+ iter->current.name);
+
+ if (dst_sa != NULL &&
+ (iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0)
+ get_addr(family, &iter->current.dstaddress, dst_sa,
+ iter->current.name);
+
+ return (ISC_R_SUCCESS);
+ } else {
+ printf(isc_msgcat_get(isc_msgcat, ISC_MSGSET_IFITERSYSCTL,
+ ISC_MSG_UNEXPECTEDTYPE,
+ "warning: unexpected interface list "
+ "message type\n"));
+ return (ISC_R_IGNORE);
+ }
+}
+
+/*
+ * Step the iterator to the next interface. Unlike
+ * isc_interfaceiter_next(), this may leave the iterator
+ * positioned on an interface that will ultimately
+ * be ignored. Return ISC_R_NOMORE if there are no more
+ * interfaces, otherwise ISC_R_SUCCESS.
+ */
+static isc_result_t
+internal_next(isc_interfaceiter_t *iter) {
+ struct ifa_msghdr *ifam;
+ REQUIRE (iter->pos < (unsigned int) iter->bufused);
+
+ ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
+
+ iter->pos += ifam->ifam_msglen;
+
+ if (iter->pos >= iter->bufused)
+ return (ISC_R_NOMORE);
+
+ return (ISC_R_SUCCESS);
+}
+
+static void
+internal_destroy(isc_interfaceiter_t *iter) {
+ UNUSED(iter); /* Unused. */
+ /*
+ * Do nothing.
+ */
+}
+
+static
+void internal_first(isc_interfaceiter_t *iter) {
+ iter->pos = 0;
+}
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