Differential D7529 Diff 19357 lib/libifconfig/libifconfig_internal.c

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lib/libifconfig/libifconfig_internal.c

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				/*
				* Copyright (c) 2016, Marie Helene Kvello-Aune
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without modification,
				* are permitted provided that the following conditions are met:
				*
				* 1. Redistributions of source code must retain the above copyright notice,
				* thislist of conditions and the following disclaimer.
				*
				* 2. Redistributions in binary form must reproduce the above copyright notice,
				* this list of conditions and the following disclaimer in the documentation and/or
				* other materials provided with the distribution.
				*
				* 3. Neither the name of the copyright holder nor the names of its contributors
				* may be used to endorse or promote products derived from this software without
				* specific prior written permission.
				*
				* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
				* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
				* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
				* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
				* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
				* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
				* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
				* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
				* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
				* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
				*/


				#include <net/if.h>

				#include <errno.h>
				#include <stdio.h>
				#include <stdlib.h>
				#include <sys/ioctl.h>
				#include <unistd.h>


				#include "libifconfig.h" // Needed for libifc_errstate
				#include "libifconfig_internal.h"

				int
				libifc_ioctlwrap_ret(libifc_handle_t *h, unsigned long request, int rcode)
				{
				if (rcode != 0) {
				h->error.errtype = IOCTL;
				h->error.ioctl_request = request;
				h->error.errcode = errno;
				}
				return (rcode);
				}


				int
				libifc_ioctlwrap(libifc_handle_t *h, const int addressfamily,
				unsigned long request, struct ifreq *ifr)
				{
				int s;

				if (libifc_socket(h, addressfamily, &s) != 0) {
				return (-1);
				}

				int rcode = ioctl(s, request, ifr);
				return (libifc_ioctlwrap_ret(h, request, rcode));
				}


				int
				libifc_ioctlwrap_caddr(libifc_handle_t *h, const int addressfamily,
				unsigned long request, struct ifreq *ifr)
				{
				int s;

				if (libifc_socket(h, addressfamily, &s) != 0) {
				return (-1);
				}

				int rcode = ioctl(s, request, (caddr_t)ifr);
				return (libifc_ioctlwrap_ret(h, request, rcode));
				}


				static int
				sdexpand(libifc_handle_t *h)
				{
				/* Initial size of dictionary is 4. If it needs to be larger, double it. */
				int newsize;

				if (h->sockets.sdsize == 0) {
				newsize = (4 * sizeof(int));
				} else {
				newsize = (2 * h->sockets.sdsize * sizeof(int));
				}

				/*
				* Don't use reallocf, as we want to keep the old allocation if
				* this one fails.
				kpUnsubmitted Done Inline Actions So != -1 here. kp: So != -1 here.
				*/
				int *nsdkeys = realloc(h->sockets.sdkeys, newsize);

				/*
				* TODO: Decide whether type 'SOCKET' should be strictly for socket(),
				* or also for anything involving getting a socket.
				*/
				kpUnsubmitted Done Inline Actions You could assign directly to h->sockets[addressfamily] here. kp: You could assign directly to h->sockets[addressfamily] here.
				if (nsdkeys == NULL) {
				h->error.errtype = OTHER;
				h->error.errcode = ENOMEM;
				return (-1);
				}

				int *nsdvals = realloc(h->sockets.sdvals, newsize);
				if (nsdvals == NULL) {
				free(nsdkeys);
				h->error.errtype = OTHER;
				h->error.errcode = ENOMEM;
				return (-1);
				}

				/* Keep old arrays so we can free them later */
				int *osdkeys = h->sockets.sdkeys;
				int *osdvals = h->sockets.sdvals;

				/*
				* If libifconfig is ever going to be thread-safe and not just
				* thread-friendly, it's important sdvals is updated first.
				* This would prevent a potential race condition when looking up keys
				* whose value isn't set yet.
				*/
				h->sockets.sdvals = nsdvals;
				h->sockets.sdkeys = nsdkeys;

				/* Free old memory maps. */
				free(osdkeys);
				free(osdvals);
				/* Update size */
				h->sockets.sdsize = newsize;
				return (0);
				}


				/*
				* Function to get socket for the specified address family.
				* If the socket doesn't already exist, attempt to create it.
				*/
				int libifc_socket(libifc_handle_t h, const int addressfamily, int s)
				{
				int sock;

				for (int i = 0; i < h->sockets.sdindex; i++) {
				if (h->sockets.sdkeys[i] == addressfamily) {
				*s = h->sockets.sdvals[i];
				return (0);
				}
				}

				/* We don't have a socket of that type available. Create one. */
				if ((h->sockets.sdindex == h->sockets.sdsize) && (sdexpand(h) != 0)) {
				/* Inherit error from sdexpand() */
				return (-1);
				}

				sock = socket(addressfamily, SOCK_DGRAM, 0);
				if (sock == -1) {
				h->error.errtype = SOCKET;
				h->error.errcode = errno;
				return (-1);
				}

				h->sockets.sdkeys[h->sockets.sdindex] = addressfamily;
				h->sockets.sdvals[h->sockets.sdindex] = sock;
				h->sockets.sdindex++;
				*s = sock;
				return (0);
				}