wutil/interface.c at master · MainKt/wutil · GitHub

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/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2025, Muhammad Saheed <saheed@FreeBSD.org>
 */

#include <sys/types.h>
#include <sys/pciio.h>
#include <sys/socket.h>
#include <sys/sysctl.h>

#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <netinet/in.h>

#include <arpa/inet.h>
#include <err.h>
#include <getopt.h>
#include <ifaddrs.h>
#include <netdb.h>
#include <regex.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "interface.h"
#include "libifconfig.h"

const char *connection_state_to_string[] = {
	[CONNECTED] = "Connected",
	[DISCONNECTED] = "Disconnected",
	[UNPLUGGED] = "Unplugged",
	[DISABLED] = "Disabled",
	[NA] = "N/A",
};

void
is_ifaddr_af_inet(ifconfig_handle_t *lifh, struct ifaddrs *ifa, void *udata)
{
	bool *is_af_inet = udata;

	(void)lifh;

	if (is_af_inet == NULL)
		return;

	if (ifa->ifa_addr->sa_family == AF_INET ||
	    ifa->ifa_addr->sa_family == AF_INET6) {
		*is_af_inet = true;
	}
}

enum connection_state
get_connection_state(struct ifconfig_handle *lifh, struct ifaddrs *ifa)
{
	bool is_interface_online = false;
	struct ifmediareq *ifmr;
	enum connection_state state = NA;
	const char *status;

	if (lifh == NULL || ifa == NULL)
		return (NA);

	ifconfig_foreach_ifaddr(lifh, ifa, is_ifaddr_af_inet,
	    &is_interface_online);

	if (ifconfig_media_get_mediareq(lifh, ifa->ifa_name, &ifmr) != 0)
		return (NA);

	status = ifconfig_media_get_status(ifmr);
	if (strncmp("wlan", ifa->ifa_name, strlen("wlan")) == 0) {
		state = (ifa->ifa_flags & IFF_UP) == 0 ? DISABLED :
		    strcmp(status, "associated") == 0 && is_interface_online ?
							 CONNECTED :
							 DISCONNECTED;
	} else if (strcmp(status, "active") == 0) {
		state = is_interface_online ? CONNECTED : DISCONNECTED;
	} else {
		state = UNPLUGGED;
	}

	free(ifmr);

	return (state);
}

void
get_mac_addr(ifconfig_handle_t *lifh, struct ifaddrs *ifa, void *udata)
{
	struct ether_addr *ea = udata;
	struct sockaddr_dl *sdl = (void *)ifa->ifa_addr;

	(void)lifh;

	if (ea == NULL)
		return;

	if (sdl->sdl_family == AF_LINK && sdl->sdl_alen == ETHER_ADDR_LEN)
		memcpy(ea, LLADDR(sdl), ETHER_ADDR_LEN);
}

bool
is_wlan_group(struct ifconfig_handle *lifh, const char *ifname)
{
	struct ifgroupreq ifgr;

	if (ifname == NULL)
		return (false);

	if (if_nametoindex(ifname) == 0) /* returns 0 if invalid i.e false */
		return (false);

	if (ifconfig_get_groups(lifh, ifname, &ifgr) == -1)
		return (false);

	for (size_t i = 0; i < ifgr.ifgr_len / sizeof(struct ifg_req); i++) {
		struct ifg_req *ifg = &ifgr.ifgr_groups[i];

		if (strcmp(ifg->ifgrq_group, "wlan") == 0)
			return (true);
	}

	return (false);
}

int
get_iface_parent(const char *ifname, int ifname_len, char *buf, int buf_len)
{ /* assumes ifname[ifname_len] == '\0' */
	char name[32];
	int group_len = sizeof("wlan") - 1;
	size_t len = buf_len;

	if (ifname_len - group_len <= 0)
		return (1);

	if (snprintf(name, sizeof(name), "net.wlan.%s.%%parent",
		ifname + group_len) >= (int)sizeof(name))
		return (1);

	if (sysctlbyname(name, buf, &len, NULL, 0) == -1)
		return (1);

	if ((int)len >= buf_len)
		len = buf_len - 1;
	buf[len] = '\0';

	return (0);
}