mirror of
https://gitlab.isc.org/isc-projects/bind9
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8b9ad57c12
warning 541: Integer overflow during conversion. when their own SIO* macros are used in ioctl calls.
345 lines
9.1 KiB
C
345 lines
9.1 KiB
C
/*
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* Copyright (C) 1999, 2000 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 SIOCGLIFCONF ioctl.
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* See netintro(4).
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*/
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#ifndef SIOCGLIFCONF
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#define SIOCGLIFCONF SIOCGIFCONF
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#define lifc_len ifc_len
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#define lifc_buf ifc_buf
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#define lifc_req ifc_req
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#define lifconf ifconf
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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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#endif
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#ifndef SIOCGLIFADDR
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#define SIOCGLIFADDR SIOCGIFADDR
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#define SIOCGLIFFLAGS SIOCGIFFLAGS
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#define SIOCGLIFDSTADDR SIOCGIFDSTADDR
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#define SIOCGLIFNETMASK SIOCGIFNETMASK
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#define lifr_addr ifr_addr
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#define lifr_name ifr_name
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#define lifr_dstaddr ifr_dstaddr
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#define lifr_flags ifr_flags
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#define ss_family sa_family
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#define lifreq ifreq
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#endif
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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 lifconf 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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SIOCGLIFCONF 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 SIOCGLIFCONF, 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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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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/*
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* Create an unbound datagram socket to do the SIOCGLIFADDR ioctl on.
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*/
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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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memset(&iter->ifc.lifc_len, 0, sizeof(iter->ifc.lifc_len));
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#ifdef ISC_HAVE_LIFC_FAMILY
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iter->ifc.lifc_family = AF_UNSPEC;
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#endif
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#ifdef ISC_HAVE_LIFC_FLAGS
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iter->ifc.lifc_flags = 0;
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#endif
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iter->ifc.lifc_len = iter->bufsize;
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iter->ifc.lifc_buf = iter->buf;
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/*
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* Ignore the HP/UX warning about "interger overflow during
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* conversion. It comes from its own macro definition,
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* and is really hard to shut up.
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*/
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if (ioctl(iter->socket, SIOCGLIFCONF, (char *)&iter->ifc)
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== -1) {
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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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/*
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* EINVAL. Retry with a bigger buffer.
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*/
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} else {
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/*
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* The ioctl succeeded.
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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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* ifc.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 (iter->ifc.lifc_len + 2 * sizeof(struct lifreq)
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< iter->bufsize)
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break;
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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, or if
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* some operation on it fails, return ISC_R_IGNORE to make
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* the higher-level iterator code ignore it.
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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 lifreq *ifrp;
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struct lifreq lifreq;
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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.lifc_len);
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ifrp = (struct lifreq *)((char *) iter->ifc.lifc_req + iter->pos);
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memset(&lifreq, 0, sizeof lifreq);
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memcpy(&lifreq, ifrp, sizeof lifreq);
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family = lifreq.lifr_addr.ss_family;
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if (family != AF_INET)
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return (ISC_R_IGNORE);
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memset(&iter->current, 0, sizeof(iter->current));
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iter->current.af = family;
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INSIST(sizeof(lifreq.lifr_name) <= sizeof(iter->current.name));
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memcpy(iter->current.name, lifreq.lifr_name, sizeof(lifreq.lifr_name));
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get_addr(family, &iter->current.address,
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(struct sockaddr *)&lifreq.lifr_addr);
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/*
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* Get interface flags.
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*/
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iter->current.flags = 0;
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/*
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* Ignore the HP/UX warning about "interger overflow during
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* conversion. It comes from its own macro definition,
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* and is really hard to shut up.
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*/
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if (ioctl(iter->socket, SIOCGLIFFLAGS, (char *) &lifreq) < 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"%s: getting interface flags: %s",
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lifreq.lifr_name,
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strerror(errno));
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return (ISC_R_IGNORE);
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}
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if ((lifreq.lifr_flags & IFF_UP) != 0)
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iter->current.flags |= INTERFACE_F_UP;
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if ((lifreq.lifr_flags & IFF_POINTOPOINT) != 0)
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iter->current.flags |= INTERFACE_F_POINTTOPOINT;
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if ((lifreq.lifr_flags & IFF_LOOPBACK) != 0)
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iter->current.flags |= INTERFACE_F_LOOPBACK;
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/*
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* If the interface is point-to-point, get the destination address.
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*/
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if ((iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0) {
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/*
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* Ignore the HP/UX warning about "interger overflow during
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* conversion. It comes from its own macro definition,
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* and is really hard to shut up.
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*/
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if (ioctl(iter->socket, SIOCGLIFDSTADDR, (char *)&lifreq)
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< 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"%s: getting destination address: %s",
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lifreq.lifr_name,
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strerror(errno));
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return (ISC_R_IGNORE);
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}
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get_addr(family, &iter->current.dstaddress,
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(struct sockaddr *)&lifreq.lifr_dstaddr);
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}
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/*
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* Get the network mask.
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*/
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memset(&lifreq, 0, sizeof lifreq);
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memcpy(&lifreq, ifrp, sizeof lifreq);
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switch (family) {
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case AF_INET:
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/*
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* Ignore the HP/UX warning about "interger overflow during
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* conversion. It comes from its own macro definition,
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* and is really hard to shut up.
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*/
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if (ioctl(iter->socket, SIOCGLIFNETMASK, (char *)&lifreq)
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< 0) {
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UNEXPECTED_ERROR(__FILE__, __LINE__,
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"%s: getting netmask: %s",
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lifreq.lifr_name,
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strerror(errno));
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return (ISC_R_IGNORE);
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}
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get_addr(family, &iter->current.netmask,
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(struct sockaddr *)&lifreq.lifr_addr);
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break;
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case AF_INET6: {
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#ifdef lifr_addrlen
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int i, bits;
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/*
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* Netmask already zeroed.
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*/
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iter->current.netmask.family = family;
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for (i = 0 ; i < lifreq.lifr_addrlen; i += 8) {
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bits = lifreq.lifr_addrlen - i;
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bits = (bits < 8 ) ? (8-bits) : 0;
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iter->current.netmask.type.in6.s6_addr[i/8] =
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(~0 << bits) &0xff;
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}
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#endif
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break;
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}
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}
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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 lifreq *ifrp;
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REQUIRE (iter->pos < (unsigned int) iter->ifc.lifc_len);
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ifrp = (struct lifreq *)((char *) iter->ifc.lifc_req + iter->pos);
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#ifdef ISC_PLATFORM_HAVESALEN
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if (ifrp->lifr_addr.sa_len > sizeof(struct sockaddr))
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iter->pos += sizeof(ifrp->lifr_name) + ifrp->lifr_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.lifc_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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