sysctl-based network interface list scanning
This commit is contained in:
Andreas Gustafsson
@@ -58,8 +58,7 @@ typedef struct {
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char name[32]; /* Interface name, null-terminated. */
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unsigned int af; /* Address family. */
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isc_netaddr_t address; /* Local address. */
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isc_netaddr_t netmask; /* Network mask
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(non-point-to-point only). */
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isc_netaddr_t netmask; /* Network mask. */
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isc_netaddr_t dstaddress; /* Destination address
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(point-to-point only). */
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isc_uint32_t flags; /* Flags; see below. */
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243
lib/isc/unix/ifiter_ioctl.c
Normal file
243
lib/isc/unix/ifiter_ioctl.c
Normal file
@@ -0,0 +1,243 @@
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/*
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* Copyright (C) 1999 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Obtain the list of network interfaces using the SIOCGIFCONF ioctl.
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* See netintro(4).
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*/
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#define IFITER_MAGIC 0x49464954U /* IFIT. */
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#define VALID_IFITER(t) ((t) != NULL && (t)->magic == IFITER_MAGIC)
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struct isc_interfaceiter {
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unsigned int magic; /* Magic number. */
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isc_mem_t *mctx;
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int socket;
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struct ifconf ifc;
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void *buf; /* Buffer for sysctl data. */
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unsigned int bufsize; /* Bytes allocated. */
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unsigned int pos; /* Current offset in
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SIOCGIFCONF data */
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isc_interface_t current; /* Current interface data. */
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isc_result_t result; /* Last result code. */
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};
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/*
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* Size of buffer for SIOCGIFCONF, in bytes. We assume no sane system
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* will have more than a megabyte of interface configuration data.
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*/
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#define IFCONF_BUFSIZE_INITIAL 4096
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#define IFCONF_BUFSIZE_MAX 1048576
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isc_result_t
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isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp)
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{
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isc_interfaceiter_t *iter;
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isc_result_t result;
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REQUIRE(mctx != NULL);
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REQUIRE(iterp != NULL);
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REQUIRE(*iterp == NULL);
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iter = isc_mem_get(mctx, sizeof(*iter));
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if (iter == NULL)
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return (ISC_R_NOMEMORY);
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iter->mctx = mctx;
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iter->buf = NULL;
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/* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
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if ((iter->socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"making interface scan socket: %s",
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strerror(errno));
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result = ISC_R_UNEXPECTED;
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goto socket_failure;
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}
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/*
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* Get the interface configuration, allocating more memory if
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* necessary.
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*/
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iter->bufsize = IFCONF_BUFSIZE_INITIAL;
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for (;;) {
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iter->buf = isc_mem_get(mctx, iter->bufsize);
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if (iter->buf == NULL) {
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result = ISC_R_NOMEMORY;
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goto alloc_failure;
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}
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iter->ifc.ifc_len = iter->bufsize;
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iter->ifc.ifc_buf = iter->buf;
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if (ioctl(iter->socket, SIOCGIFCONF, (char *) &iter->ifc) >= 0)
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break;
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if (errno != EINVAL) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"get interface configuration: %s",
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strerror(errno));
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result = ISC_R_UNEXPECTED;
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goto ioctl_failure;
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}
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if (iter->bufsize >= IFCONF_BUFSIZE_MAX) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"get interface configuration: "
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"maximum buffer size exceeded");
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result = ISC_R_UNEXPECTED;
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goto ioctl_failure;
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}
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isc_mem_put(mctx, iter->buf, iter->bufsize);
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iter->bufsize *= 2;
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}
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/*
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* A newly created iterator has an undefined position
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* until isc_interfaceiter_first() is called.
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*/
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iter->pos = (unsigned int) -1;
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iter->result = ISC_R_FAILURE;
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iter->magic = IFITER_MAGIC;
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*iterp = iter;
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return (ISC_R_SUCCESS);
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ioctl_failure:
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isc_mem_put(mctx, iter->buf, iter->bufsize);
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alloc_failure:
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(void) close(iter->socket);
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socket_failure:
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isc_mem_put(mctx, iter, sizeof *iter);
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return (result);
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}
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/*
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* Get information about the current interface to iter->current.
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* If successful, return ISC_R_SUCCESS.
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* If the interface has an unsupported address family,
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* return ISC_R_FAILURE. In case of other failure,
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* return ISC_R_UNEXPECTED.
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*/
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static isc_result_t
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internal_current(isc_interfaceiter_t *iter) {
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struct ifreq *ifrp;
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struct ifreq ifreq;
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int family;
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REQUIRE(VALID_IFITER(iter));
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REQUIRE (iter->pos < (unsigned int) iter->ifc.ifc_len);
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ifrp = (struct ifreq *)((char *) iter->ifc.ifc_req + iter->pos);
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memcpy(&ifreq, ifrp, sizeof ifreq);
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family = ifreq.ifr_addr.sa_family;
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if (family != AF_INET) /* XXX IPv6 */
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return (ISC_R_FAILURE);
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memset(&iter->current, 0, sizeof(iter->current));
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INSIST(sizeof(ifreq.ifr_name) <= sizeof(iter->current.name));
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memcpy(iter->current.name, ifreq.ifr_name, sizeof(ifreq.ifr_name));
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get_addr(family, &iter->current.address, &ifreq.ifr_addr);
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/* Get interface flags. */
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iter->current.flags = 0;
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if (ioctl(iter->socket, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"%s: getting interface flags: %s",
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ifreq.ifr_name,
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strerror(errno));
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return (ISC_R_UNEXPECTED);
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}
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if ((ifreq.ifr_flags & IFF_UP) != 0)
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iter->current.flags |= INTERFACE_F_UP;
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if ((ifreq.ifr_flags & IFF_POINTOPOINT) != 0)
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iter->current.flags |= INTERFACE_F_POINTTOPOINT;
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if ((ifreq.ifr_flags & IFF_LOOPBACK) != 0)
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iter->current.flags |= INTERFACE_F_LOOPBACK;
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/* If the interface is point-to-point, get the destination address. */
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if ((iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0) {
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if (ioctl(iter->socket, SIOCGIFDSTADDR, (char *) &ifreq) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"%s: getting destination address: %s",
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ifreq.ifr_name,
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strerror(errno));
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return (ISC_R_UNEXPECTED);
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}
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get_addr(family, &iter->current.dstaddress,
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&ifreq.ifr_dstaddr);
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}
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/* Get the network mask. */
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if (ioctl(iter->socket, SIOCGIFNETMASK, (char *) &ifreq) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"%s: getting netmask: %s",
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ifreq.ifr_name,
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strerror(errno));
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return (ISC_R_UNEXPECTED);
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}
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get_addr(family, &iter->current.netmask,
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&ifreq.ifr_addr);
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return (ISC_R_SUCCESS);
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}
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/*
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* Step the iterator to the next interface. Unlike
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* isc_interfaceiter_next(), this may leave the iterator
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* positioned on an interface that will ultimately
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* be ignored. Return ISC_R_NOMORE if there are no more
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* interfaces, otherwise ISC_R_SUCCESS.
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*/
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static isc_result_t
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internal_next(isc_interfaceiter_t *iter) {
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struct ifreq *ifrp;
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REQUIRE (iter->pos < (unsigned int) iter->ifc.ifc_len);
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ifrp = (struct ifreq *)((char *) iter->ifc.ifc_req + iter->pos);
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#ifdef ISC_NET_HAVESALEN
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if (ifrp->ifr_addr.sa_len > sizeof(struct sockaddr))
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iter->pos += sizeof(ifrp->ifr_name) + ifrp->ifr_addr.sa_len;
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else
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#endif
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iter->pos += sizeof *ifrp;
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if (iter->pos >= (unsigned int) iter->ifc.ifc_len)
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return (ISC_R_NOMORE);
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return (ISC_R_SUCCESS);
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}
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static void
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internal_destroy(isc_interfaceiter_t *iter) {
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(void) close(iter->socket);
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}
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264
lib/isc/unix/ifiter_sysctl.c
Normal file
264
lib/isc/unix/ifiter_sysctl.c
Normal file
@@ -0,0 +1,264 @@
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/*
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* Copyright (C) 1999 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
|
||||
*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
|
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
|
||||
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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/*
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* Obtain the list of network interfaces using sysctl.
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* See TCP/IP Illustrated Volume 2, sections 19.8, 19.14,
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* and 19.16.
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*/
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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/* XXX what about Alpha? */
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#ifdef sgi
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#define ROUNDUP(a) ((a) > 0 ? \
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(1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) : \
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sizeof(__uint64_t))
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#else
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#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
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: sizeof(long))
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#endif
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#define IFITER_MAGIC 0x49464953U /* IFIS. */
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#define VALID_IFITER(t) ((t) != NULL && (t)->magic == IFITER_MAGIC)
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struct isc_interfaceiter {
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unsigned int magic; /* Magic number. */
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isc_mem_t *mctx;
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void *buf; /* Buffer for sysctl data. */
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unsigned int bufsize; /* Bytes allocated. */
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unsigned int bufused; /* Bytes used. */
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unsigned int pos; /* Current offset in
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sysctl data. */
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isc_interface_t current; /* Current interface data. */
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isc_result_t result; /* Last result code. */
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};
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static int mib[6] = {
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CTL_NET,
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PF_ROUTE,
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0,
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0, /* Any address family. */
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NET_RT_IFLIST,
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0 /* Flags. */
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};
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isc_result_t
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isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp)
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{
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isc_interfaceiter_t *iter;
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isc_result_t result;
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REQUIRE(mctx != NULL);
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REQUIRE(iterp != NULL);
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REQUIRE(*iterp == NULL);
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iter = isc_mem_get(mctx, sizeof(*iter));
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if (iter == NULL)
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return (ISC_R_NOMEMORY);
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iter->mctx = mctx;
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iter->buf = 0;
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/* Determine the amount of memory needed. */
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if (sysctl(mib, 6, 0, &iter->bufsize, 0, 0) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"getting interface list size: sysctl: %s",
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strerror(errno));
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result = ISC_R_UNEXPECTED;
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goto failure;
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}
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iter->buf = isc_mem_get(iter->mctx, iter->bufsize);
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if (iter->buf == NULL) {
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result = ISC_R_NOMEMORY;
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goto failure;
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}
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iter->bufused = iter->bufsize;
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if (sysctl(mib, 6, iter->buf, &iter->bufused, 0, 0) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"getting interface list: sysctl: %s",
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strerror(errno));
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result = ISC_R_UNEXPECTED;
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goto failure;
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}
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INSIST(iter->bufused <= iter->bufsize);
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/*
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* A newly created iterator has an undefined position
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* until isc_interfaceiter_first() is called.
|
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*/
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iter->pos = (unsigned int) -1;
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iter->result = ISC_R_FAILURE;
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iter->magic = IFITER_MAGIC;
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*iterp = iter;
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return (ISC_R_SUCCESS);
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failure:
|
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if (iter->buf != NULL)
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isc_mem_put(mctx, iter->buf, iter->bufsize);
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isc_mem_put(mctx, iter, sizeof *iter);
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return (result);
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}
|
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|
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/*
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* Get information about the current interface to iter->current.
|
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* If successful, return ISC_R_SUCCESS.
|
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* If the interface has an unsupported address family,
|
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* return ISC_R_FAILURE. In case of other failure,
|
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* return ISC_R_UNEXPECTED.
|
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*/
|
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|
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static isc_result_t
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internal_current(isc_interfaceiter_t *iter) {
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struct ifa_msghdr *ifam, *ifam_end;
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REQUIRE(VALID_IFITER(iter));
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REQUIRE (iter->pos < (unsigned int) iter->bufused);
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ifam = (struct ifa_msghdr *) ((char *) iter->buf + iter->pos);
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ifam_end = (struct ifa_msghdr *) ((char *) iter->buf + iter->bufused);
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if (ifam->ifam_type == RTM_IFINFO) {
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struct if_msghdr *ifm = (struct if_msghdr *) ifam;
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struct sockaddr_dl *sdl = (struct sockaddr_dl *) (ifm + 1);
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unsigned int namelen;
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|
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memset(&iter->current, 0, sizeof(iter->current));
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|
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namelen = sdl->sdl_nlen;
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if (namelen > sizeof(iter->current.name) - 1)
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namelen = sizeof(iter->current.name) - 1;
|
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|
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memcpy(iter->current.name, sdl->sdl_data, namelen);
|
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|
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iter->current.flags = 0;
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|
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if ((ifam->ifam_flags & IFF_UP) != 0)
|
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iter->current.flags |= INTERFACE_F_UP;
|
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|
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if ((ifam->ifam_flags & IFF_POINTOPOINT) != 0)
|
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iter->current.flags |= INTERFACE_F_POINTTOPOINT;
|
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|
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if ((ifam->ifam_flags & IFF_LOOPBACK) != 0)
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iter->current.flags |= INTERFACE_F_LOOPBACK;
|
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|
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/*
|
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* This is not an interface address.
|
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* Force another iteration.
|
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*/
|
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return (ISC_R_FAILURE);
|
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} else if (ifam->ifam_type == RTM_NEWADDR) {
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int i;
|
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int family;
|
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struct sockaddr *mask_sa = NULL;
|
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struct sockaddr *addr_sa = NULL;
|
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struct sockaddr *dst_sa = NULL;
|
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|
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struct sockaddr *sa = (struct sockaddr *)(ifam + 1);
|
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family = sa->sa_family;
|
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|
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for (i = 0; i < RTAX_MAX; i++)
|
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{
|
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if ((ifam->ifam_addrs & (1 << i)) == 0)
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continue;
|
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|
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INSIST(sa < (struct sockaddr *) ifam_end);
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|
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switch (i) {
|
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case RTAX_NETMASK: /* Netmask */
|
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mask_sa = sa;
|
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break;
|
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case RTAX_IFA: /* Interface address */
|
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addr_sa = sa;
|
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break;
|
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case RTAX_BRD: /* Broadcast or destination address */
|
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dst_sa = sa;
|
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break;
|
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}
|
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#ifdef ISC_NET_HAVESALEN
|
||||
sa = (struct sockaddr *)((char*)(sa)
|
||||
+ ROUNDUP(sa->sa_len));
|
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#else
|
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#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_FAILURE);
|
||||
|
||||
family = addr_sa->sa_family;
|
||||
if (family != AF_INET) /* XXX IP6 */
|
||||
return (ISC_R_FAILURE);
|
||||
|
||||
get_addr(family, &iter->current.address, addr_sa);
|
||||
|
||||
if (mask_sa != NULL)
|
||||
get_addr(family, &iter->current.netmask, mask_sa);
|
||||
|
||||
if (dst_sa != NULL &&
|
||||
(iter->current.flags & IFF_POINTOPOINT) != 0)
|
||||
get_addr(family, &iter->current.dstaddress, dst_sa);
|
||||
|
||||
return (ISC_R_SUCCESS);
|
||||
} else {
|
||||
printf("warning: unexpected interface list message type\n");
|
||||
return (ISC_R_FAILURE);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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) {
|
||||
iter = iter; /* Unused. */
|
||||
/* Do nothing. */
|
||||
}
|
||||
|
||||
@@ -40,112 +40,7 @@
|
||||
#include <isc/types.h>
|
||||
#include <isc/interfaceiter.h>
|
||||
|
||||
#define IFITER_MAGIC 0x49464954U /* IFIT. */
|
||||
#define VALID_IFITER(t) ((t) != NULL && (t)->magic == IFITER_MAGIC)
|
||||
|
||||
struct isc_interfaceiter {
|
||||
unsigned int magic; /* Magic number. */
|
||||
isc_mem_t *mctx;
|
||||
int socket;
|
||||
struct ifconf ifc;
|
||||
unsigned int bufsize;
|
||||
unsigned int pos; /* Current offset in
|
||||
SIOGCONF data */
|
||||
isc_interface_t current; /* Current interface data. */
|
||||
isc_result_t result; /* Last result code. */
|
||||
};
|
||||
|
||||
|
||||
/*
|
||||
* Size of buffer for SIOCGIFCONF, in bytes. We assume no sane system
|
||||
* will have more than a megabyte of interface configuration data.
|
||||
*/
|
||||
#define IFCONF_BUFSIZE_INITIAL 4096
|
||||
#define IFCONF_BUFSIZE_MAX 1048576
|
||||
|
||||
isc_result_t
|
||||
isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp)
|
||||
{
|
||||
isc_interfaceiter_t *iter;
|
||||
isc_result_t result;
|
||||
char *buf;
|
||||
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;
|
||||
|
||||
/* Create an unbound datagram socket to do the SIOCGIFADDR ioctl on. */
|
||||
if ((iter->socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
|
||||
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
||||
"making interface scan socket: %s",
|
||||
strerror(errno));
|
||||
result = ISC_R_UNEXPECTED;
|
||||
goto socket_failure;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get the interface configuration, allocating more memory if
|
||||
* necessary.
|
||||
*/
|
||||
iter->bufsize = IFCONF_BUFSIZE_INITIAL;
|
||||
|
||||
for (;;) {
|
||||
buf = isc_mem_get(mctx, iter->bufsize);
|
||||
if (buf == NULL) {
|
||||
result = ISC_R_NOMEMORY;
|
||||
goto alloc_failure;
|
||||
}
|
||||
|
||||
iter->ifc.ifc_len = iter->bufsize;
|
||||
iter->ifc.ifc_buf = buf;
|
||||
if (ioctl(iter->socket, SIOCGIFCONF, (char *) &iter->ifc) >= 0)
|
||||
break;
|
||||
if (errno != EINVAL) {
|
||||
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
||||
"get interface configuration: %s",
|
||||
strerror(errno));
|
||||
result = ISC_R_UNEXPECTED;
|
||||
goto ioctl_failure;
|
||||
}
|
||||
|
||||
if (iter->bufsize >= IFCONF_BUFSIZE_MAX) {
|
||||
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
||||
"get interface configuration: "
|
||||
"maximum buffer size exceeded");
|
||||
result = ISC_R_UNEXPECTED;
|
||||
goto ioctl_failure;
|
||||
}
|
||||
isc_mem_put(mctx, buf, iter->bufsize);
|
||||
|
||||
iter->bufsize *= 2;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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);
|
||||
|
||||
ioctl_failure:
|
||||
isc_mem_put(mctx, buf, iter->bufsize);
|
||||
|
||||
alloc_failure:
|
||||
(void) close(iter->socket);
|
||||
|
||||
socket_failure:
|
||||
isc_mem_put(mctx, iter, sizeof *iter);
|
||||
return (result);
|
||||
}
|
||||
/* Common utility functions */
|
||||
|
||||
/*
|
||||
* Extract the network address part from a "struct sockaddr".
|
||||
@@ -170,117 +65,20 @@ get_addr(int family, isc_netaddr_t *dst, struct sockaddr *src) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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_FAILURE. In case of other failure,
|
||||
* return ISC_R_UNEXPECTED.
|
||||
*/
|
||||
|
||||
static isc_result_t
|
||||
internal_current(isc_interfaceiter_t *iter) {
|
||||
struct ifreq *ifrp;
|
||||
struct ifreq ifreq;
|
||||
int family;
|
||||
|
||||
REQUIRE(VALID_IFITER(iter));
|
||||
REQUIRE (iter->pos < (unsigned int) iter->ifc.ifc_len);
|
||||
|
||||
ifrp = (struct ifreq *)((char *) iter->ifc.ifc_req + iter->pos);
|
||||
|
||||
memcpy(&ifreq, ifrp, sizeof ifreq);
|
||||
|
||||
family = ifreq.ifr_addr.sa_family;
|
||||
if (family != AF_INET) /* XXX IPv6 */
|
||||
return (ISC_R_FAILURE);
|
||||
|
||||
memset(&iter->current, 0, sizeof(iter->current));
|
||||
|
||||
INSIST(sizeof(ifreq.ifr_name) <= sizeof(iter->current.name));
|
||||
memcpy(iter->current.name, ifreq.ifr_name, sizeof(ifreq.ifr_name));
|
||||
|
||||
get_addr(family, &iter->current.address, &ifreq.ifr_addr);
|
||||
|
||||
/* Get interface flags. */
|
||||
|
||||
iter->current.flags = 0;
|
||||
|
||||
if (ioctl(iter->socket, SIOCGIFFLAGS, (char *) &ifreq) < 0) {
|
||||
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
||||
"%s: getting interface flags: %s",
|
||||
ifreq.ifr_name,
|
||||
strerror(errno));
|
||||
return (ISC_R_UNEXPECTED);
|
||||
}
|
||||
|
||||
if ((ifreq.ifr_flags & IFF_UP) != 0)
|
||||
iter->current.flags |= INTERFACE_F_UP;
|
||||
|
||||
if ((ifreq.ifr_flags & IFF_POINTOPOINT) != 0)
|
||||
iter->current.flags |= INTERFACE_F_POINTTOPOINT;
|
||||
|
||||
if ((ifreq.ifr_flags & IFF_LOOPBACK) != 0)
|
||||
iter->current.flags |= INTERFACE_F_LOOPBACK;
|
||||
|
||||
/*
|
||||
* If point-to-point, get the destination address;
|
||||
* otherwise, get the network mask.
|
||||
*/
|
||||
if ((iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0) {
|
||||
if (ioctl(iter->socket, SIOCGIFDSTADDR, (char *) &ifreq) < 0) {
|
||||
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
||||
"%s: getting destination address: %s",
|
||||
ifreq.ifr_name,
|
||||
strerror(errno));
|
||||
return (ISC_R_UNEXPECTED);
|
||||
}
|
||||
get_addr(family, &iter->current.dstaddress,
|
||||
&ifreq.ifr_dstaddr);
|
||||
} else {
|
||||
if (ioctl(iter->socket, SIOCGIFNETMASK, (char *) &ifreq) < 0) {
|
||||
UNEXPECTED_ERROR(__FILE__, __LINE__,
|
||||
"%s: getting netmask: %s",
|
||||
ifreq.ifr_name,
|
||||
strerror(errno));
|
||||
return (ISC_R_UNEXPECTED);
|
||||
}
|
||||
get_addr(family, &iter->current.netmask,
|
||||
&ifreq.ifr_addr);
|
||||
}
|
||||
|
||||
return (ISC_R_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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.
|
||||
* Include system-dependent code.
|
||||
*/
|
||||
static isc_result_t
|
||||
internal_next(isc_interfaceiter_t *iter) {
|
||||
struct ifreq *ifrp;
|
||||
|
||||
REQUIRE (iter->pos < (unsigned int) iter->ifc.ifc_len);
|
||||
|
||||
ifrp = (struct ifreq *)((char *) iter->ifc.ifc_req + iter->pos);
|
||||
|
||||
#ifdef ISC_NET_HAVESALEN
|
||||
if (ifrp->ifr_addr.sa_len > sizeof(struct sockaddr))
|
||||
iter->pos += sizeof(ifrp->ifr_name) + ifrp->ifr_addr.sa_len;
|
||||
else
|
||||
#if HAVE_IFLIST_SYSCTL
|
||||
#include "ifiter_sysctl.c"
|
||||
#else
|
||||
#include "ifiter_ioctl.c"
|
||||
#endif
|
||||
iter->pos += sizeof *ifrp;
|
||||
|
||||
if (iter->pos >= (unsigned int) iter->ifc.ifc_len)
|
||||
return (ISC_R_NOMORE);
|
||||
|
||||
return (ISC_R_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* The remaining code is common to the sysctl and ioctl case.
|
||||
*/
|
||||
|
||||
isc_result_t
|
||||
isc_interfaceiter_current(isc_interfaceiter_t *iter,
|
||||
@@ -291,9 +89,6 @@ isc_interfaceiter_current(isc_interfaceiter_t *iter,
|
||||
return (ISC_R_SUCCESS);
|
||||
}
|
||||
|
||||
/*
|
||||
* Position the iterator on the first user-visible interface.
|
||||
*/
|
||||
isc_result_t
|
||||
isc_interfaceiter_first(isc_interfaceiter_t *iter) {
|
||||
isc_result_t result;
|
||||
@@ -305,6 +100,7 @@ isc_interfaceiter_first(isc_interfaceiter_t *iter) {
|
||||
result = internal_current(iter);
|
||||
if (result == ISC_R_SUCCESS)
|
||||
break;
|
||||
INSIST(result == ISC_R_FAILURE);
|
||||
result = internal_next(iter);
|
||||
if (result == ISC_R_NOMORE)
|
||||
break;
|
||||
@@ -314,9 +110,6 @@ isc_interfaceiter_first(isc_interfaceiter_t *iter) {
|
||||
return (result);
|
||||
}
|
||||
|
||||
/*
|
||||
* Position the iterator on the next user-visible interface.
|
||||
*/
|
||||
isc_result_t
|
||||
isc_interfaceiter_next(isc_interfaceiter_t *iter) {
|
||||
isc_result_t result;
|
||||
@@ -332,6 +125,7 @@ isc_interfaceiter_next(isc_interfaceiter_t *iter) {
|
||||
result = internal_current(iter);
|
||||
if (result == ISC_R_SUCCESS)
|
||||
break;
|
||||
INSIST(result == ISC_R_FAILURE);
|
||||
}
|
||||
iter->result = result;
|
||||
return (result);
|
||||
@@ -345,8 +139,8 @@ isc_interfaceiter_destroy(isc_interfaceiter_t **iterp)
|
||||
iter = *iterp;
|
||||
REQUIRE(VALID_IFITER(iter));
|
||||
|
||||
(void) close(iter->socket);
|
||||
isc_mem_put(iter->mctx, iter->ifc.ifc_buf, iter->bufsize);
|
||||
internal_destroy(iter);
|
||||
isc_mem_put(iter->mctx, iter->buf, iter->bufsize);
|
||||
|
||||
iter->magic = 0;
|
||||
isc_mem_put(iter->mctx, iter, sizeof *iter);
|
||||
|
||||
Reference in New Issue
Block a user