iOS开发之获取网关IP地址,路由器地址

iOS开发之获取网关IP地址,路由器地址,在网上找了段代码,说要自己建立route.h,测试发现目前iOS SDK已经包含了route.h,直接使用啦,直接上代码

#define CTL_NET         4               /* network, see socket.h */
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#import "NetInfo.h"
#include <arpa/inet.h>
#include <sys/sysctl.h>
#include <net/route.h>
@implementation NetInfo
+ (NSString *)getGatewayIPAddress {
    
    NSString *address = nil;
    
    /* 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;
    int r = -1;
    
    if(sysctl(mib, sizeof(mib)/sizeof(int), 0, &l, 0, 0) < 0) {
        address = @"192.168.0.1";
    }
    
    if(l>0) {
        buf = malloc(l);
        if(sysctl(mib, sizeof(mib)/sizeof(int), buf, &l, 0, 0) < 0) {
            address = @"192.168.0.1";
        }
        
        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) {
                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;
                    r = 0;
                    address = [NSString stringWithFormat:@"%s", inet_ntoa(*((struct in_addr*)&addr))];
                    NSLog(@"\naddress%@",address);
                    break;
                }
            }
        }
        free(buf);
    }
    return address;
}
@end

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