如果你想获取iPhone连接的wifi的gateway地址，那么恭喜你，坑来了，倒不是说这个是苹果的bug，是网络上人云亦云的误导。
网络上基本都是这样写的：
- 头文件 NetworkHelper.h
/// 蜂窝网络的IP地址
#define IOS_CELLULAR @"pdp_ip0"
/// WIFI的IP地址
#define IOS_WIFI @"en0"
/// VPN地址
#define IOS_VPN @"utun0"
/// ipv4和ipv6
#define IP_ADDR_IPv4 @"ipv4"
#define IP_ADDR_IPv6 @"ipv6"
@interface NetworkHelper : NSObject
/**
获取ipv4网关地址
*/
+ (NSDictionary *)getGatewayIPV4Addresses;
/**
获取ipv6网关地址
*/
+ (NSDictionary *)getGatewayIPV6Addresses;
@end
- 实现 NetworkHelper.m
#import "NetworkHelper.h"
#include <arpa/inet.h>
#import <sys/sysctl.h>
#include "route.h"
#import <ifaddrs.h>
#import <net/if.h>
#include <ifaddrs.h>
+ (NSDictionary *)getGatewayIPV4Addresses
{
NSMutableDictionary *addresses = [NSMutableDictionary dictionary];
/* net.route.0.inet.flags.gateway */
int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET, NET_RT_FLAGS, RTF_GATEWAY};
size_t l;
char *buf, *p;
struct rt_msghdr *rt;
struct sockaddr *sa;
struct sockaddr *sa_tab[RTAX_MAX];
int i;
if (sysctl(mib, sizeof(mib) / sizeof(int), 0, &l, 0, 0) < 0) {
return nil;
}
if (l > 0) {
buf = malloc(l);
if (sysctl(mib, sizeof(mib) / sizeof(int), buf, &l, 0, 0) < 0) {
return nil;
}
for (p = buf; p < buf + l; p += rt->rtm_msglen) {
rt = (struct rt_msghdr *)p;
sa = (struct sockaddr *)(rt + 1);
for (i = 0; i < RTAX_MAX; i++) {
if (rt->rtm_addrs & (1 << i)) {
sa_tab[i] = sa;
sa = (struct sockaddr *)((char *)sa + ROUNDUP(sa->sa_len));
} else {
sa_tab[i] = NULL;
}
}
if (((rt->rtm_addrs & (RTA_DST | RTA_GATEWAY)) == (RTA_DST | RTA_GATEWAY)) &&
sa_tab[RTAX_DST]->sa_family == AF_INET &&
sa_tab[RTAX_GATEWAY]->sa_family == AF_INET) {
unsigned char octet[4] = {0, 0, 0, 0};
int i;
for (i = 0; i < 4; i++) {
octet[i] = (((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr >>
(i * 8)) &
0xFF;
}
if (((struct sockaddr_in *)sa_tab[RTAX_DST])->sin_addr.s_addr == 0) {
in_addr_t addr = ((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr;
NSString *address = [self p_formatIPV4Address:*((struct in_addr *)&addr)];
if (address.length) {
char ifName[128];
if_indextoname(rt->rtm_index, ifName);
NSString *key = [NSString stringWithFormat:@"%s/%@", ifName, IP_ADDR_IPv4];
addresses[key] = address;
}
}
}
}
free(buf);
}
return addresses;
}
+ (NSDictionary *)getGatewayIPV6Addresses
{
NSMutableDictionary *addresses = [NSMutableDictionary dictionary];
/* net.route.0.inet.flags.gateway */
int mib[] = {CTL_NET, PF_ROUTE, 0, AF_INET6, NET_RT_FLAGS, RTF_GATEWAY};
size_t l;
char *buf, *p;
struct rt_msghdr *rt;
struct sockaddr_in6 *sa;
struct sockaddr_in6 *sa_tab[RTAX_MAX];
int i;
if (sysctl(mib, sizeof(mib) / sizeof(int), 0, &l, 0, 0) < 0) {
return nil;
}
if (l > 0) {
buf = malloc(l);
if (sysctl(mib, sizeof(mib) / sizeof(int), buf, &l, 0, 0) < 0) {
return nil;
}
for (p = buf; p < buf + l; p += rt->rtm_msglen) {
rt = (struct rt_msghdr *)p;
sa = (struct sockaddr_in6 *)(rt + 1);
for (i = 0; i < RTAX_MAX; i++) {
if (rt->rtm_addrs & (1 << i)) {
sa_tab[i] = sa;
sa = (struct sockaddr_in6 *)((char *)sa + sa->sin6_len);
} else {
sa_tab[i] = NULL;
}
}
if( ((rt->rtm_addrs & (RTA_DST|RTA_GATEWAY)) == (RTA_DST|RTA_GATEWAY))
&& sa_tab[RTAX_DST]->sin6_family == AF_INET6
&& sa_tab[RTAX_GATEWAY]->sin6_family == AF_INET6) {
NSString *address = [self p_formatIPV6Address:((struct sockaddr_in6 *)(sa_tab[RTAX_GATEWAY]))->sin6_addr];
if (address.length) {
char ifName[128];
if_indextoname(rt->rtm_index, ifName);
NSString *key = [NSString stringWithFormat:@"%s/%@", ifName, IP_ADDR_IPv6];
addresses[key] = address;
}
}
}
free(buf);
}
return addresses;
}
+ (NSString *)p_formatIPV4Address:(struct in_addr)ipv4Addr{
NSString *address = nil;
char dstStr[INET_ADDRSTRLEN];
char srcStr[INET_ADDRSTRLEN];
memcpy(srcStr, &ipv4Addr, sizeof(struct in_addr));
if(inet_ntop(AF_INET, srcStr, dstStr, INET_ADDRSTRLEN) != NULL){
address = [NSString stringWithUTF8String:dstStr];
}
return address;
}
+ (NSString *)p_formatIPV6Address:(struct in6_addr)ipv6Addr{
NSString *address = nil;
char dstStr[INET6_ADDRSTRLEN];
char srcStr[INET6_ADDRSTRLEN];
memcpy(srcStr, &ipv6Addr, sizeof(struct in6_addr));
if(inet_ntop(AF_INET6, srcStr, dstStr, INET6_ADDRSTRLEN) != NULL){
address = [NSString stringWithUTF8String:dstStr];
}
return address;
}
- 还有一个 route.h，我特么也不知道怎么来的，忘记了，感觉好low
/*
* Copyright (c) 2000-2008 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1980, 1986, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)route.h 8.3 (Berkeley) 4/19/94
* $FreeBSD: src/sys/net/route.h,v 1.36.2.1 2000/08/16 06:14:23 jayanth Exp $
*/
#ifndef _NET_ROUTE_H_
#define _NET_ROUTE_H_
#include <stdint.h>
#include <sys/appleapiopts.h>
#include <sys/socket.h>
#include <sys/types.h>
/*
* Kernel resident routing tables.
*
* The routing tables are initialized when interface addresses
* are set by making entries for all directly connected interfaces.
*/
/*
* A route consists of a destination address and a reference
* to a routing entry. These are often held by protocols
* in their control blocks, e.g. inpcb.
*/
struct route;
/*
* These numbers are used by reliable protocols for determining
* retransmission behavior and are included in the routing structure.
*/
struct rt_metrics {
u_int32_t rmx_locks; /* Kernel must leave these values alone */
u_int32_t rmx_mtu; /* MTU for this path */
u_int32_t rmx_hopcount; /* max hops expected */
int32_t rmx_expire; /* lifetime for route, e.g. redirect */
u_int32_t rmx_recvpipe; /* inbound delay-bandwidth product */
u_int32_t rmx_sendpipe; /* outbound delay-bandwidth product */
u_int32_t rmx_ssthresh; /* outbound gateway buffer limit */
u_int32_t rmx_rtt; /* estimated round trip time */
u_int32_t rmx_rttvar; /* estimated rtt variance */
u_int32_t rmx_pksent; /* packets sent using this route */
u_int32_t rmx_filler[4]; /* will be used for T/TCP later */
};
/*
* rmx_rtt and rmx_rttvar are stored as microseconds;
*/
#define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */
/*
* We distinguish between routes to hosts and routes to networks,
* preferring the former if available. For each route we infer
* the interface to use from the gateway address supplied when
* the route was entered. Routes that forward packets through
* gateways are marked so that the output routines know to address the
* gateway rather than the ultimate destination.
*/
#define RTF_UP 0x1 /* route usable */
#define RTF_GATEWAY 0x2 /* destination is a gateway */
#define RTF_HOST 0x4 /* host entry (net otherwise) */
#define RTF_REJECT 0x8 /* host or net unreachable */
#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */
#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */
#define RTF_DONE 0x40 /* message confirmed */
#define RTF_DELCLONE 0x80 /* delete cloned route */
#define RTF_CLONING 0x100 /* generate new routes on use */
#define RTF_XRESOLVE 0x200 /* external daemon resolves name */
#define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */
#define RTF_STATIC 0x800 /* manually added */
#define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */
#define RTF_PROTO2 0x4000 /* protocol specific routing flag */
#define RTF_PROTO1 0x8000 /* protocol specific routing flag */
#define RTF_PRCLONING 0x10000 /* protocol requires cloning */
#define RTF_WASCLONED 0x20000 /* route generated through cloning */
#define RTF_PROTO3 0x40000 /* protocol specific routing flag */
/* 0x80000 unused */
#define RTF_PINNED 0x100000 /* future use */
#define RTF_LOCAL 0x200000 /* route represents a local address */
#define RTF_BROADCAST 0x400000 /* route represents a bcast address */
#define RTF_MULTICAST 0x800000 /* route represents a mcast address */
#define RTF_IFSCOPE 0x1000000 /* has valid interface scope */
#define RTF_CONDEMNED 0x2000000 /* defunct; no longer modifiable */
/* 0x4000000 and up unassigned */
/*
* Routing statistics.
*/
struct rtstat {
short rts_badredirect; /* bogus redirect calls */
short rts_dynamic; /* routes created by redirects */
short rts_newgateway; /* routes modified by redirects */
short rts_unreach; /* lookups which failed */
short rts_wildcard; /* lookups satisfied by a wildcard */
};
/*
* Structures for routing messages.
*/
struct rt_msghdr {
u_short rtm_msglen; /* to skip over non-understood messages */
u_char rtm_version; /* future binary compatibility */
u_char rtm_type; /* message type */
u_short rtm_index; /* index for associated ifp */
int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
int rtm_addrs; /* bitmask identifying sockaddrs in msg */
pid_t rtm_pid; /* identify sender */
int rtm_seq; /* for sender to identify action */
int rtm_errno; /* why failed */
int rtm_use; /* from rtentry */
u_int32_t rtm_inits; /* which metrics we are initializing */
struct rt_metrics rtm_rmx; /* metrics themselves */
};
struct rt_msghdr2 {
u_short rtm_msglen; /* to skip over non-understood messages */
u_char rtm_version; /* future binary compatibility */
u_char rtm_type; /* message type */
u_short rtm_index; /* index for associated ifp */
int rtm_flags; /* flags, incl. kern & message, e.g. DONE */
int rtm_addrs; /* bitmask identifying sockaddrs in msg */
int32_t rtm_refcnt; /* reference count */
int rtm_parentflags; /* flags of the parent route */
int rtm_reserved; /* reserved field set to 0 */
int rtm_use; /* from rtentry */
u_int32_t rtm_inits; /* which metrics we are initializing */
struct rt_metrics rtm_rmx; /* metrics themselves */
};
#define RTM_VERSION 5 /* Up the ante and ignore older versions */
/*
* Message types.
*/
#define RTM_ADD 0x1 /* Add Route */
#define RTM_DELETE 0x2 /* Delete Route */
#define RTM_CHANGE 0x3 /* Change Metrics or flags */
#define RTM_GET 0x4 /* Report Metrics */
#define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */
#define RTM_REDIRECT 0x6 /* Told to use different route */
#define RTM_MISS 0x7 /* Lookup failed on this address */
#define RTM_LOCK 0x8 /* fix specified metrics */
#define RTM_OLDADD 0x9 /* caused by SIOCADDRT */
#define RTM_OLDDEL 0xa /* caused by SIOCDELRT */
#define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */
#define RTM_NEWADDR 0xc /* address being added to iface */
#define RTM_DELADDR 0xd /* address being removed from iface */
#define RTM_IFINFO 0xe /* iface going up/down etc. */
#define RTM_NEWMADDR 0xf /* mcast group membership being added to if */
#define RTM_DELMADDR 0x10 /* mcast group membership being deleted */
#define RTM_IFINFO2 0x12 /* */
#define RTM_NEWMADDR2 0x13 /* */
#define RTM_GET2 0x14 /* */
/*
* Bitmask values for rtm_inits and rmx_locks.
*/
#define RTV_MTU 0x1 /* init or lock _mtu */
#define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */
#define RTV_EXPIRE 0x4 /* init or lock _expire */
#define RTV_RPIPE 0x8 /* init or lock _recvpipe */
#define RTV_SPIPE 0x10 /* init or lock _sendpipe */
#define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */
#define RTV_RTT 0x40 /* init or lock _rtt */
#define RTV_RTTVAR 0x80 /* init or lock _rttvar */
/*
* Bitmask values for rtm_addrs.
*/
#define RTA_DST 0x1 /* destination sockaddr present */
#define RTA_GATEWAY 0x2 /* gateway sockaddr present */
#define RTA_NETMASK 0x4 /* netmask sockaddr present */
#define RTA_GENMASK 0x8 /* cloning mask sockaddr present */
#define RTA_IFP 0x10 /* interface name sockaddr present */
#define RTA_IFA 0x20 /* interface addr sockaddr present */
#define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */
#define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */
/*
* Index offsets for sockaddr array for alternate internal encoding.
*/
#define RTAX_DST 0 /* destination sockaddr present */
#define RTAX_GATEWAY 1 /* gateway sockaddr present */
#define RTAX_NETMASK 2 /* netmask sockaddr present */
#define RTAX_GENMASK 3 /* cloning mask sockaddr present */
#define RTAX_IFP 4 /* interface name sockaddr present */
#define RTAX_IFA 5 /* interface addr sockaddr present */
#define RTAX_AUTHOR 6 /* sockaddr for author of redirect */
#define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */
#define RTAX_MAX 8 /* size of array to allocate */
struct rt_addrinfo {
int rti_addrs;
struct sockaddr *rti_info[RTAX_MAX];
};
struct route_cb {
int ip_count;
int ip6_count;
int ipx_count;
int ns_count;
int iso_count;
int any_count;
};
#endif
然后让你去取en0，说en0就是WIFI网卡连接的gateway地址。我之前也是深信不疑，知道我发现某些手机是en2，我特么知道，错了，离谱了！！！
一顿搜索，发现这个链接：https://developer.apple.com/forums/thread/724299
意思是我们不能通过指定 interface name 来确定WIFI网卡，en0只是行业内的约定俗成，并非标准，应该通过 NWPathMonitor 来获取 WIFI 对应的 interface name，然后再调用上面的方法获取 gateway 地址。操蛋了不是么，NWPathMonitor 从iOS12开始支持。
从iOS10开始，国内增加了特供功能，在使用用户的WIFI和蜂窝网络时，需要申请相应的权限，然而该权限的申请并未提供给开发者。 开发者只能调用某个接口，来触发该权限弹框的弹出。因此引入了一个巨坑，该权限弹框并不是总能稳定的弹出，导致随机的应用无法访问网络。遇到这种情况怎么办？
func syncCheckCellularPermission() -> Bool {
var havePermission = false
let semaphore = DispatchSemaphore(value: 0)
let cellularData = CTCellularData()
cellularData.cellularDataRestrictionDidUpdateNotifier = { state in
havePermission = state == .notRestricted
semaphore.signal()
}
semaphore.wait()
cellularData.cellularDataRestrictionDidUpdateNotifier = nil
// 没有权限，只是弹框引导用户去设置页面
if !havePermission {
DispatchQueue.main.async {
// TODO: 弹窗提醒
}
}
return havePermission
}在某些情况下，应用检测出没有权限，弹框提醒用户去授权无线数据权限，等用户跳转到应用权限设置页面，却没有无线数据这一项。
从网上搜索的信息来看，应用开发者无法解决这个问题，只能通过提示用户该怎么操作，恢复出无线数据这一项。
-
方法一：【设置】-【蜂窝网络】-【无线局域网助理】打开，然后重启应用，我没有尝试过，不知道能不能行，因为我们还没遇到过这种情况
-
方法二：【设置】-【通用】-【传输或还原iPhone】-【还原】-【还原网络设置】，执行这步操作，所有用到无线数据的应用会重新申请无线数据权限， 但同时带来的副作用是，所用使用了无线数据的应用，都要重新授权【无线数据】权限。