C语言获取ip、mac地址等信息一直没有一个跨平台的接口,
之前通过gethostname
、gethostbyname
尝试,却只能得到127.0.0.1 localhost
的ip地址,
不得不自己封装一个,Windows、unix平台下分别实现
在Windows平台下使用IPHlpApi.h
提供的GetAdaptersAddresses
、GetAdaptersInfo
在unix平台使用
提供的ioctl
两种平台做了统一的封装和对最后结果集的过滤,源码如下:
#include
#include
#include
#include
typedef struct ifconfig_s {
char name[128];
char ip[32];
char mask[32];
char mac[32];
} ifconfig_t;
#ifdef __unix__
#include
#include
#include
#include
#include
#include
#include
int ifconfig(std::vector& ifcs) {
int sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock < 0) {
return -10;
}
struct ifconf ifc;
char buf[1024];
ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
int iRet = ioctl(sock, SIOCGIFCONF, &ifc);
if (iRet != 0) {
close(sock);
return iRet;
}
int cnt = ifc.ifc_len / sizeof(struct ifreq);
//printf("ifc.size=%d\n", cnt);
if (cnt == 0) {
close(sock);
return -20;
}
struct ifreq ifr;
ifcs.clear();
ifconfig_t tmp;
char macaddr[32] = {'\0'};
for (int i = 0; i < cnt; ++i) {
// name
strcpy(ifr.ifr_name, ifc.ifc_req[i].ifr_name);
//printf("name: %s\n", ifr.ifr_name);
strncpy(tmp.name, ifr.ifr_name, sizeof(tmp.name));
// flags
//iRet = ioctl(sock, SIOCGIFFLAGS, &ifr);
//short flags = ifr.ifr_flags;
// addr
iRet = ioctl(sock, SIOCGIFADDR, &ifr);
struct sockaddr_in* addr = (struct sockaddr_in*)&ifr.ifr_addr;
char* ip = inet_ntoa(addr->sin_addr);
//printf("ip: %s\n", ip);
strncpy(tmp.ip, ip, sizeof(tmp.ip));
// netmask
iRet = ioctl(sock, SIOCGIFNETMASK, &ifr);
addr = (struct sockaddr_in*)&ifr.ifr_netmask;
char* netmask = inet_ntoa(addr->sin_addr);
//printf("netmask: %s\n", netmask);
strncpy(tmp.mask, netmask, sizeof(tmp.mask));
// broadaddr
//iRet = ioctl(sock, SIOCGIFBRDADDR, &ifr);
//addr = (struct sockaddr_in*)&ifr.ifr_broadaddr;
//char* broadaddr = inet_ntoa(addr->sin_addr);
//printf("broadaddr: %s\n", broadaddr);
// hwaddr
iRet = ioctl(sock, SIOCGIFHWADDR, &ifr);
snprintf(macaddr, sizeof(macaddr), "%02x:%02x:%02x:%02x:%02x:%02x",
(unsigned char)ifr.ifr_hwaddr.sa_data[0],
(unsigned char)ifr.ifr_hwaddr.sa_data[1],
(unsigned char)ifr.ifr_hwaddr.sa_data[2],
(unsigned char)ifr.ifr_hwaddr.sa_data[3],
(unsigned char)ifr.ifr_hwaddr.sa_data[4],
(unsigned char)ifr.ifr_hwaddr.sa_data[5]);
//printf("mac: %s\n", macaddr);
strncpy(tmp.mac, macaddr, sizeof(tmp.mac));
//printf("\n");
if (strcmp(tmp.ip, "0.0.0.0") == 0 ||
strcmp(tmp.ip, "127.0.0.1") == 0 ||
strcmp(tmp.mac, "00:00:00:00:00:00") == 0) {
continue;
}
ifcs.push_back(tmp);
}
close(sock);
return 0;
}
#elif defined(_WIN32)
#include
#include
#include
#ifdef _MSC_VER
#pragma comment(lib, "Iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")
#endif
int ifconfig(std::vector& ifcs) {
PIP_ADAPTER_ADDRESSES pAddrs = NULL;
ULONG buflen = 0;
GetAdaptersAddresses(AF_INET, 0, NULL, pAddrs, &buflen);
pAddrs = (PIP_ADAPTER_ADDRESSES)malloc(buflen);
GetAdaptersAddresses(AF_INET, 0, NULL, pAddrs, &buflen);
PIP_ADAPTER_INFO pInfos = NULL;
buflen = 0;
GetAdaptersInfo(pInfos, &buflen);
pInfos = (PIP_ADAPTER_INFO)malloc(buflen);
GetAdaptersInfo(pInfos, &buflen);
ifconfig_t ifc;
std::vector tmp_ifcs;
PIP_ADAPTER_ADDRESSES pAddr = pAddrs;
char mac[32] = {'\0'};
while (pAddr) {
snprintf(mac, sizeof(mac), "%02x:%02x:%02x:%02x:%02x:%02x",
pAddr->PhysicalAddress[0],
pAddr->PhysicalAddress[1],
pAddr->PhysicalAddress[2],
pAddr->PhysicalAddress[3],
pAddr->PhysicalAddress[4],
pAddr->PhysicalAddress[5]);
memset(&ifc, 0, sizeof(ifc));
strncpy(ifc.name, pAddr->AdapterName, sizeof(ifc.name));
strncpy(ifc.ip, "0.0.0.0", sizeof(ifc.ip));
strncpy(ifc.mask, "0.0.0.0", sizeof(ifc.ip));
strncpy(ifc.mac, mac, sizeof(ifc.mac));
tmp_ifcs.push_back(ifc);
pAddr = pAddr->Next;
}
PIP_ADAPTER_INFO pInfo = pInfos;
while (pInfo) {
for (auto& item : tmp_ifcs) {
if (strcmp(item.name, pInfo->AdapterName) == 0) {
// description more friendly
strncpy(item.name, pInfo->Description, sizeof(item.name));
strncpy(item.ip, pInfo->IpAddressList.IpAddress.String, sizeof(item.ip));
strncpy(item.mask, pInfo->IpAddressList.IpMask.String, sizeof(item.mask));
}
}
pInfo = pInfo->Next;
}
free(pAddrs);
free(pInfos);
// filter
ifcs.clear();
for (auto& item : tmp_ifcs) {
if (strcmp(item.ip, "0.0.0.0") == 0 ||
strcmp(item.ip, "127.0.0.1") == 0 ||
strcmp(item.mac, "00:00:00:00:00:00") == 0) {
continue;
}
ifcs.push_back(item);
}
return 0;
}
#else
int ifconfig(std::vector& ifcs) {
return -10; // unimplemented
}
#endif
int main(int argc, char** argv) {
std::vector ifcs;
ifconfig(ifcs);
for (auto& item : ifcs) {
printf("%s\nip: %s\nmask: %s\nmac: %s\n\n",
item.name,
item.ip,
item.mask,
item.mac);
}
return 0;
}
linux下输出如下:
eth0
ip: 10.1.10.111
mask: 255.255.255.0
mac: 08:00:27:13:46:0e
windows下输出如下:
Intel(R) Dual Band Wireless-AC 3165
ip: 10.1.10.134
mask: 255.255.255.0
mac: 74:e5:f9:59:18:66