C++ 在C+上联网的设备+;
我需要访问设备上的网络接口。我有下面的代码可以做到这一点,但我错过了那些活动的,但没有IP地址关联到他们。你知道我如何通过编程的方式收集这些信息吗 发布的代码具有从接口获取信息的函数、列出所有接口的函数和要测试的主代码 谢谢C++ 在C+上联网的设备+;,c++,c++11,networking,ioctl,C++,C++11,Networking,Ioctl,我需要访问设备上的网络接口。我有下面的代码可以做到这一点,但我错过了那些活动的,但没有IP地址关联到他们。你知道我如何通过编程的方式收集这些信息吗 发布的代码具有从接口获取信息的函数、列出所有接口的函数和要测试的主代码 谢谢 struct iface { std::string name; std::string address; std::string netmask; std::string broadcast; std::string hwaddr;
struct iface {
std::string name;
std::string address;
std::string netmask;
std::string broadcast;
std::string hwaddr;
int mtu;
};
void print_iface(iface s) {
std::cout << s.name << ": <UP, RUNNING>" << std::endl;
std::cout << " mtu: " << s.mtu << std::endl;
std::cout << " hwaddr: " << s.hwaddr << " " << std::endl;
std::cout << " inet: " << s.address << " " << std::endl;
std::cout << " netmask: " << s.netmask << " " << std::endl;
std::cout << " broadcast: " << s.broadcast << std::endl;
}
std::tuple<char*, int> get_active_interfaces() {
int socketfd;
struct ifconf conf;
char data[4096];
socketfd = socket(AF_INET, SOCK_DGRAM, 0);
conf.ifc_len = sizeof(data);
conf.ifc_buf = (caddr_t) data;
if (ioctl(socketfd, SIOCGIFCONF, &conf) < 0) {
fprintf(stderr, "ioctl error: %s", std::strerror(errno));
return std::make_tuple(nullptr, 0);
} else {
return std::make_tuple(data, conf.ifc_len);
}
}
std::string get_ifname(struct ifreq *ifr) {
return ifr->ifr_name;
}
std::string get_ipv4_addr(struct ifreq *ifr) {
std::string addr(45, 0);
inet_ntop(ifr->ifr_addr.sa_family,
&((struct sockaddr_in*) &ifr->ifr_addr)->sin_addr, &addr[0],
addr.size());
return addr;
}
#define MAC_TEMPLATE "%02X:%02X:%02X:%02X:%02X:%02X"
#define LOOPBACK_TEMPLATE "LOOPBAK INTERFACE"
std::string get_mac_addr(struct ifreq *ifr) {
std::string addr;
u_int8_t hd[6];
struct ifreq ifl;
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock >= 0) {
strcpy(ifl.ifr_name, ifr->ifr_name);
if (ioctl(sock, SIOCGIFFLAGS, &ifl) == 0) {
if (!(ifl.ifr_flags & IFF_LOOPBACK)) {
if (ioctl(sock, SIOCGIFHWADDR, &ifl) == 0) {
memcpy(hd, ifl.ifr_hwaddr.sa_data, sizeof(hd));
size_t n = snprintf(nullptr, 0, MAC_TEMPLATE, hd[0], hd[1],
hd[2], hd[3], hd[4], hd[5]);
addr.resize(n + 1, 0);
sprintf(&addr[0], MAC_TEMPLATE, hd[0], hd[1], hd[2], hd[3],
hd[4], hd[5]);
}
} else {
addr = LOOPBACK_TEMPLATE;
}
}
}
return addr;
}
std::string get_netmask(struct ifreq *ifr) {
std::string addr(45, 0);
struct ifreq ifl;
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock >= 0) {
strcpy(ifl.ifr_name, ifr->ifr_name);
if (ioctl(sock, SIOCGIFNETMASK, &ifl) == 0) {
inet_ntop(ifl.ifr_addr.sa_family,
&((struct sockaddr_in*) &ifl.ifr_addr)->sin_addr, &addr[0],
addr.size());
}
}
return addr;
}
std::string get_broadcast(struct ifreq *ifr) {
std::string addr(45, 0);
struct ifreq ifl;
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock >= 0) {
strcpy(ifl.ifr_name, ifr->ifr_name);
if (ioctl(sock, SIOCGIFFLAGS, &ifl) == 0) {
if (!(ifl.ifr_flags & IFF_LOOPBACK)) {
if (ioctl(sock, SIOCGIFBRDADDR, &ifl) == 0) {
inet_ntop(ifl.ifr_addr.sa_family,
&((struct sockaddr_in*) &ifl.ifr_addr)->sin_addr,
&addr[0], addr.size());
}
} else {
addr = LOOPBACK_TEMPLATE;
}
}
}
return addr;
}
int get_mtu(struct ifreq *ifr) {
int mtu = 0;
struct ifreq ifl;
int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock >= 0) {
strcpy(ifl.ifr_name, ifr->ifr_name);
if (ioctl(sock, SIOCGIFMTU, &ifl) == 0) {
mtu = ifl.ifr_mtu;
}
}
return mtu;
}
/**
* Return a list of interface (network layer) addresses.
* Accept or return only AF_INET socket addresses are
* IP-specific and perhaps should rather be documented in ip(7).
* [https://www.man7.org/linux/man-pages/man7/ip.7.html]
* This currently means only addresses of the AF_INET (IPv4)
* family for compatibility.
* The names of interfaces with no addresses or that don't have the
* IFF_RUNNING flag set can be found via /proc/net/dev.
*/
std::vector<iface> get_ifce_list() {
std::vector<iface> ifaces;
int socketfd;
printf("Opening socket...");
socketfd = socket(AF_INET, SOCK_DGRAM, 0);
if (socketfd >= 0) {
printf(" OK\n");
printf("Discovering interfaces...\n");
auto data = get_active_interfaces();
for (struct ifreq *ifr = (struct ifreq*) std::get<0>(data);
(char*) ifr < std::get<0>(data) + std::get<1>(data); ifr++) {
switch (ifr->ifr_addr.sa_family) {
case AF_INET: {
iface ifc;
ifc.name = get_ifname(ifr);
ifc.address = get_ipv4_addr(ifr);
ifc.netmask = get_netmask(ifr);
ifc.broadcast = get_broadcast(ifr);
ifc.hwaddr = get_mac_addr(ifr);
ifc.mtu = get_mtu(ifr);
ifaces.emplace_back(ifc);
break;
}
#if USE_IPV6
case AF_INET6:
break;
#endif
}
}
close(socketfd);
} else {
printf(" Failed!\n");
}
return ifaces;
}
// This is the main function
int main() {
std::time_t start = std::time(nullptr), stop;
std::vector<iface> _ifaces = get_ifce_list();
for (auto &_iface : _ifaces) {
print_iface(_iface);
}
stop = std::time(nullptr);
std::cout << "End of code. ran for: " << stop - start << " seconds. "
<< std::endl;
return 0;
}
struct-iface{
std::字符串名;
std::字符串地址;
字符串网络掩码;
字符串广播;
std::字符串hwaddr;
国际mtu;
};
无效打印\u iface(iface s){
std::cout此代码在以下几个方面存在问题:
std::tuple<char*, int> get_active_interfaces() {
int socketfd;
struct ifconf conf;
char data[4096];
socketfd = socket(AF_INET, SOCK_DGRAM, 0);
conf.ifc_len = sizeof(data);
conf.ifc_buf = (caddr_t) data;
if (ioctl(socketfd, SIOCGIFCONF, &conf) < 0) {
fprintf(stderr, "ioctl error: %s", std::strerror(errno));
return std::make_tuple(nullptr, 0);
} else {
return std::make_tuple(data, conf.ifc_len);
}
}
< >我将重新定义函数,返回<代码> STD::tuple < /C> >,将“代码>第二版/代码>的含义改为元素的数目,而不是字节的数目。这样,调用方可以围绕一组结构进行组织,并且您可以用字节和Casks来进行处理。因为您在C++中工作,所以可以让您重复O。用std::for_每个整齐地浏览数组。感谢您的回复
size_t N = ifc_len / sizeof(ifc_req[0]);
conf.ifc_req = new ifreq(N);