ios获取设备路由器地址

// // getgateway.c // MSTEnterprise // // Created by 磊强 on 13-4-24. // Copyright (c) 2013年 LeiQiang. All rights reserved. // #include <stdio.h> #include <netinet/in.h> #include <stdlib.h> #include <sys/sysctl.h> #include "getgateway.h" #include "route.h" #include <net/if.h> #include <string.h> #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)) 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; } #endif