依赖库：
#import "IpTool.h"
#include <stdio.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <string.h>
#include <arpa/inet.h>
需要引入的宏：
#if TARGET_IPHONE_SIMULATOR
#include <net/route.h>
#else
#include "route.h"
#endif
#define CTL_NET 4 /* network, see socket.h */
#if defined(BSD) || defined(__APPLE__)
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
C实现代码：
static int getdefaultgateway(in_addr_t * addr)
{
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;
int r = -1;
if(sysctl(mib, sizeof(mib)/sizeof(int), 0, &l, 0, 0) < 0) {
return -1;
}
if(l>0) {
buf = malloc(l);
if(sysctl(mib, sizeof(mib)/sizeof(int), buf, &l, 0, 0) < 0) {
return -1;
}
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) {
if(((struct sockaddr_in *)sa_tab[RTAX_DST])->sin_addr.s_addr == 0) {
char ifName[128];
if_indextoname(rt->rtm_index,ifName);
if(strcmp("en0",ifName)==0){
*addr = ((struct sockaddr_in *)(sa_tab[RTAX_GATEWAY]))->sin_addr.s_addr;
r = 0;
}
}
}
}
free(buf);
}
return r;
}
OC调用代码：
+ (NSString *)getRouterIP {
struct in_addr gatewayaddr;
int r = getdefaultgateway(&(gatewayaddr.s_addr));
if (r >= 0) {
return [NSString stringWithFormat: @"%s",inet_ntoa(gatewayaddr)];
}
return nil;
}
注：route.h文件需要去APPLE的Open Source下载，以下附上内容，可直接复制粘贴生成route.h文件后拖入Xcode文件目录
/*
* 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 <sys/appleapiopts.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/socket.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.
*/
#ifdef PRIVATE
struct rtentry;
struct route {
/*
* N.B: struct route must begin with ro_rt and ro_flags
* because the code does some casts of a 'struct route_in6 *'
* to a 'struct route *'.
*/
struct rtentry *ro_rt;
uint32_t ro_flags; /* route flags (see below) */
struct sockaddr ro_dst;
};
#define ROF_SRCIF_SELECTED 0x1 /* source interface was selected */
#else
struct route;
#endif /* PRIVATE */
/*
* 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.
*/
#ifdef KERNEL_PRIVATE
#include <kern/locks.h>
#ifndef RNF_NORMAL
#include <net/radix.h>
#endif
/*
* Kernel routing entry structure (private).
*/
struct rtentry {
struct radix_node rt_nodes[2]; /* tree glue, and other values */
#define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key))
#define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask))
struct sockaddr *rt_gateway; /* value */
int32_t rt_refcnt; /* # held references */
uint32_t rt_flags; /* up/down?, host/net */
struct ifnet *rt_ifp; /* the answer: interface to use */
struct ifaddr *rt_ifa; /* the answer: interface addr to use */
struct sockaddr *rt_genmask; /* for generation of cloned routes */
void *rt_llinfo; /* pointer to link level info cache */
void (*rt_llinfo_free)(void *); /* link level info free function */
struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */
struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */
struct rtentry *rt_parent; /* cloning parent of this route */
uint32_t generation_id; /* route generation id */
/*
* See bsd/net/route.c for synchronization notes.
*/
decl_lck_mtx_data(, rt_lock); /* lock for routing entry */
};
#endif /* KERNEL_PRIVATE */
#ifdef KERNEL_PRIVATE
#define rt_use rt_rmx.rmx_pksent
#endif /* KERNEL_PRIVATE */
#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 */
#ifdef PRIVATE
#define RTM_GET_SILENT 0x11
#endif /* PRIVATE */
#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;
};
#ifdef PRIVATE
/*
* For scoped routing; a zero interface scope value means nil/no scope.
*/
#define IFSCOPE_NONE 0
#endif /* PRIVATE */
#ifdef KERNEL_PRIVATE
/*
* Generic call trace used by some subsystems (e.g. route, ifaddr)
*/
#define CTRACE_STACK_SIZE 8 /* depth of stack trace */
#define CTRACE_HIST_SIZE 4 /* refcnt history size */
typedef struct ctrace {
void *th; /* thread ptr */
void *pc[CTRACE_STACK_SIZE]; /* PC stack trace */
} ctrace_t;
extern void ctrace_record(ctrace_t *);
#define RT_LOCK_ASSERT_HELD(_rt) \
lck_mtx_assert(&(_rt)->rt_lock, LCK_MTX_ASSERT_OWNED)
#define RT_LOCK_ASSERT_NOTHELD(_rt) \
lck_mtx_assert(&(_rt)->rt_lock, LCK_MTX_ASSERT_NOTOWNED)
#define RT_LOCK(_rt) do { \
if (!rte_debug) \
lck_mtx_lock(&(_rt)->rt_lock); \
else \
rt_lock(_rt, FALSE); \
} while (0)
#define RT_LOCK_SPIN(_rt) do { \
if (!rte_debug) \
lck_mtx_lock_spin(&(_rt)->rt_lock); \
else \
rt_lock(_rt, TRUE); \
} while (0)
#define RT_CONVERT_LOCK(_rt) do { \
RT_LOCK_ASSERT_HELD(_rt); \
lck_mtx_convert_spin(&(_rt)->rt_lock); \
} while (0)
#define RT_UNLOCK(_rt) do { \
if (!rte_debug) \
lck_mtx_unlock(&(_rt)->rt_lock); \
else \
rt_unlock(_rt); \
} while (0)
#define RT_ADDREF_LOCKED(_rt) do { \
if (!rte_debug) { \
RT_LOCK_ASSERT_HELD(_rt); \
if (++(_rt)->rt_refcnt == 0) \
panic("RT_ADDREF(%p) bad refcnt\n", _rt); \
} else { \
rtref(_rt); \
} \
} while (0)
/*
* Spin variant mutex is used here; caller is responsible for
* converting any previously-held similar lock to full mutex.
*/
#define RT_ADDREF(_rt) do { \
RT_LOCK_SPIN(_rt); \
RT_ADDREF_LOCKED(_rt); \
RT_UNLOCK(_rt); \
} while (0)
#define RT_REMREF_LOCKED(_rt) do { \
if (!rte_debug) { \
RT_LOCK_ASSERT_HELD(_rt); \
if ((_rt)->rt_refcnt == 0) \
panic("RT_REMREF(%p) bad refcnt\n", _rt); \
--(_rt)->rt_refcnt; \
} else { \
(void) rtunref(_rt); \
} \
} while (0)
/*
* Spin variant mutex is used here; caller is responsible for
* converting any previously-held similar lock to full mutex.
*/
#define RT_REMREF(_rt) do { \
RT_LOCK_SPIN(_rt); \
RT_REMREF_LOCKED(_rt); \
RT_UNLOCK(_rt); \
} while (0)
#define RTFREE(_rt) rtfree(_rt)
#define RTFREE_LOCKED(_rt) rtfree_locked(_rt)
extern struct route_cb route_cb;
extern struct radix_node_head *rt_tables[AF_MAX+1];
__private_extern__ lck_mtx_t *rnh_lock;
__private_extern__ int use_routegenid;
__private_extern__ uint32_t route_generation;
__private_extern__ int rttrash;
__private_extern__ unsigned int rte_debug;
struct ifmultiaddr;
struct proc;
extern void route_init(void) __attribute__((section("__TEXT, initcode")));
extern void routegenid_update(void);
extern void rt_ifmsg(struct ifnet *);
extern void rt_missmsg(int, struct rt_addrinfo *, int, int);
extern void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
extern void rt_newmaddrmsg(int, struct ifmultiaddr *);
extern int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
extern void set_primary_ifscope(unsigned int);
extern unsigned int get_primary_ifscope(void);
extern boolean_t rt_inet_default(struct rtentry *, struct sockaddr *);
extern struct rtentry *rt_lookup(boolean_t, struct sockaddr *,
struct sockaddr *, struct radix_node_head *, unsigned int);
extern void rtalloc(struct route *);
extern void rtalloc_ign(struct route *, uint32_t);
extern void rtalloc_ign_locked(struct route *, uint32_t);
extern void rtalloc_scoped_ign(struct route *, uint32_t, unsigned int);
extern void rtalloc_scoped_ign_locked(struct route *, uint32_t, unsigned int);
extern struct rtentry *rtalloc1(struct sockaddr *, int, uint32_t);
extern struct rtentry *rtalloc1_locked(struct sockaddr *, int, uint32_t);
extern struct rtentry *rtalloc1_scoped(struct sockaddr *, int, uint32_t,
unsigned int);
extern struct rtentry *rtalloc1_scoped_locked(struct sockaddr *, int,
uint32_t, unsigned int);
extern void rtfree(struct rtentry *);
extern void rtfree_locked(struct rtentry *);
extern void rtref(struct rtentry *);
/*
* rtunref will decrement the refcount, rtfree will decrement and free if
* the refcount has reached zero and the route is not up.
* Unless you have good reason to do otherwise, use rtfree.
*/
extern int rtunref(struct rtentry *);
extern void rtsetifa(struct rtentry *, struct ifaddr *);
extern int rtinit(struct ifaddr *, int, int);
extern int rtinit_locked(struct ifaddr *, int, int);
extern int rtioctl(unsigned long, caddr_t, struct proc *);
extern void rtredirect(struct ifnet *, struct sockaddr *, struct sockaddr *,
struct sockaddr *, int, struct sockaddr *, struct rtentry **);
extern int rtrequest(int, struct sockaddr *,
struct sockaddr *, struct sockaddr *, int, struct rtentry **);
extern int rtrequest_locked(int, struct sockaddr *,
struct sockaddr *, struct sockaddr *, int, struct rtentry **);
extern int rtrequest_scoped_locked(int, struct sockaddr *, struct sockaddr *,
struct sockaddr *, int, struct rtentry **, unsigned int);
extern unsigned int sa_get_ifscope(struct sockaddr *);
extern void rt_lock(struct rtentry *, boolean_t);
extern void rt_unlock(struct rtentry *);
extern struct sockaddr *rtm_scrub_ifscope(int, struct sockaddr *,
struct sockaddr *, struct sockaddr_storage *);
#endif /* KERNEL_PRIVATE */
#endif
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