我有一些跨平台的DNS客户端代码,用于执行端到端SMTP操作,在Windows上,我可以通过查找注册表来查找当前DNS服务器IP地址。在Mac上,我可能可以使用SystemConfiguration框架,如第一个答案中所提到的,但是具体的做法并不是立即显而易见的。
例如,SCDynamicStoreCopyDHCPInfo返回一些动态DHCP相关数据,但不包括DNS服务器地址。
例如,SCDynamicStoreCopyDHCPInfo返回一些动态DHCP相关数据,但不包括DNS服务器地址。
我知道回答这个问题已经很晚了,但可能对其他人有帮助。
以下代码可以帮助完成这个任务...
SCPreferencesRef prefsDNS = SCPreferencesCreate(NULL, CFSTR("DNSSETTING"), NULL);
CFArrayRef services = SCNetworkServiceCopyAll(prefsDNS);
long servicesCount = CFArrayGetCount(services);
for (long i = 0; i < servicesCount; i++) {
const SCNetworkServiceRef service = (const SCNetworkServiceRef)CFArrayGetValueAtIndex(services, i);
CFStringRef interfaceServiceID = SCNetworkServiceGetServiceID(service);
CFStringRef primaryservicepath = CFStringCreateWithFormat(NULL,NULL,CFSTR("State:/Network/Service/%@/DNS"),interfaceServiceID);
SCDynamicStoreRef dynRef = SCDynamicStoreCreate(kCFAllocatorSystemDefault, CFSTR("DNSSETTING"), NULL, NULL);
CFPropertyListRef propList = SCDynamicStoreCopyValue(dynRef,primaryservicepath);
if (propList) {
CFDictionaryRef dict = (CFDictionaryRef)propList;
CFArrayRef addresses = (CFArrayRef)CFDictionaryGetValue(dict, CFSTR("ServerAddresses"));
long addressesCount = CFArrayGetCount(addresses);
for (long j = 0; j < addressesCount; j++) {
CFStringRef address = (CFStringRef)CFArrayGetValueAtIndex(addresses, j);
// Print address
CFShow(address);
}
CFRelease(propList);
}
CFRelease(dynRef);
CFRelease(primaryservicepath);
}
CFRelease(services);
CFRelease(prefsDNS);
我知道你需要这个已经有很长时间了,但是没有什么比一个旧的未解决的答案更糟糕的了。由于权限问题,你无法从“/etc/resolv.conf”中访问它们。经过多次搜索和一点运气,我发现你可以通过res_ninit()函数获取它。
// Get native iOS System Resolvers
res_ninit(&_res);
res_state res = &_res;
for (int i = 0; i < res->nscount; i++) {
sa_family_t family = res->nsaddr_list[i].sin_family;
int port = ntohs(res->nsaddr_list[i].sin_port);
if (family == AF_INET) { // IPV4 address
char str[INET_ADDRSTRLEN]; // String representation of address
inet_ntop(AF_INET, & (res->nsaddr_list[i].sin_addr.s_addr), str, INET_ADDRSTRLEN);
} else if (family == AF_INET6) { // IPV6 address
char str[INET6_ADDRSTRLEN]; // String representation of address
inet_ntop(AF_INET6, &(res->nsaddr_list [i].sin_addr.s_addr), str, INET6_ADDRSTRLEN);
}
}
res_ndestroy(res);
它们也可以从/etc/resolv.conf中获取
res_state
结构内部:https://dev59.com/iozda4cB1Zd3GeqPqLqJ#41303040 - Alnitak