Differential D24141 Diff 69744 usr.bin/netstat/common.c

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usr.bin/netstat/common.c

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				/*-
				* SPDX-License-Identifier: BSD-3-Clause
				*
				* Copyright (c) 1983, 1988, 1993
				* The Regents of the University of California. 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, this list 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 University 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 REGENTS 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 REGENTS 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 <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/protosw.h>
				#include <sys/socket.h>
				#include <sys/socketvar.h>
				#include <sys/sysctl.h>
				#include <sys/time.h>

				#include <net/if.h>
				#include <net/if_dl.h>
				#include <arpa/inet.h>
				#include <ifaddrs.h>
				#include <libutil.h>
				#include <netdb.h>
				#include <stdbool.h>
				#include <stdint.h>
				#include <stdio.h>
				#include <stdlib.h>
				#include <stdbool.h>
				#include <string.h>
				#include <sysexits.h>
				#include <unistd.h>
				#include <err.h>
				#include <libxo/xo.h>
				#include "netstat.h"
				#include "common.h"

				const char *
				fmt_flags(const struct bits *p, int f)
				{
				static char name[33];
				char *flags;

				for (flags = name; p->b_mask; p++)
				if (p->b_mask & f)
				*flags++ = p->b_val;
				*flags = '\0';
				return (name);
				}

				void
				print_flags_generic(int flags, const struct bits pbits, const char format,
				const char *tag_name)
				{
				const struct bits *p;
				char tag_fmt[64];

				xo_emit(format, fmt_flags(pbits, flags));

				snprintf(tag_fmt, sizeof(tag_fmt), "{le:%s/%%s}", tag_name);
				xo_open_list(tag_name);
				for (p = pbits; p->b_mask; p++)
				if (p->b_mask & flags)
				xo_emit(tag_fmt, p->b_name);
				xo_close_list(tag_name);
				}

				struct ifmap_entry *
				prepare_ifmap(size_t *pifmap_size)
				{
				int ifindex = 0, size;
				struct ifaddrs ifap, ifa;
				struct sockaddr_dl *sdl;

				struct ifmap_entry *ifmap = NULL;
				int ifmap_size = 0;

				/*
				* Retrieve interface list at first
				* since we need #ifindex -> if_xname match
				*/
				if (getifaddrs(&ifap) != 0)
				err(EX_OSERR, "getifaddrs");

				for (ifa = ifap; ifa; ifa = ifa->ifa_next) {

				if (ifa->ifa_addr->sa_family != AF_LINK)
				continue;

				sdl = (struct sockaddr_dl *)ifa->ifa_addr;
				ifindex = sdl->sdl_index;

				if (ifindex >= ifmap_size) {
				size = roundup(ifindex + 1, 32) *
				sizeof(struct ifmap_entry);
				if ((ifmap = realloc(ifmap, size)) == NULL)
				errx(2, "realloc(%d) failed", size);
				memset(&ifmap[ifmap_size], 0,
				size - ifmap_size *
				sizeof(struct ifmap_entry));

				ifmap_size = roundup(ifindex + 1, 32);
				}

				if (*ifmap[ifindex].ifname != '\0')
				continue;

				strlcpy(ifmap[ifindex].ifname, ifa->ifa_name, IFNAMSIZ);
				}

				freeifaddrs(ifap);

				*pifmap_size = ifmap_size;

				return (ifmap);
				}