working commit
This commit is contained in:
Олег Бородин
-387
@@ -1,387 +0,0 @@
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extern "C" {
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <linux/if.h>
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#include <linux/if_tun.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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}
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#include <cstring>
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#include <expected>
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#include <string>
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#include <vector>
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#include <span>
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#include <iostream>
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#include <thread>
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#include <chrono>
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#include <interface.hpp>
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std::expected<void, std::string> Interface::Create(const std::string name) {
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if ((tunfd = open("/dev/net/tun", O_RDWR | O_CLOEXEC)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Create interface error: " + error);
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}
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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ifr.ifr_flags = IFF_TUN | IFF_NO_PI;
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strncpy(ifr.ifr_name, name.c_str(), IFNAMSIZ - 1);
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if (ioctl(tunfd, TUNSETIFF, (void*)(&ifr)) < 0) {
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close(tunfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Create interface error: " + error);
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}
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ifname = ifr.ifr_name;
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#if 0
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if (ioctl(tunfd, TUNSETPERSIST, 0) < 0) {
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close(tunfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Create interface error: " + error);
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}
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#endif
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//struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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close(tunfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Get MTU error: " + error);
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}
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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if (ioctl(sockfd, SIOCGIFMTU, &ifr) < 0) {
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close(tunfd);
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Get MTU error: " + error);
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}
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close(sockfd);
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mtu = ifr.ifr_mtu;
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return {};
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}
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std::expected<void, std::string> Interface::SetMTU(int ifmtu) {
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set MTU error: " + error);
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}
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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ifr.ifr_mtu = ifmtu;
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if (ioctl(sockfd, SIOCSIFMTU, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set MTU error: " + error);
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}
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close(sockfd);
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return {};
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}
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std::expected<int, std::string> Interface::GetMTU(void) {
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Get MTU error: " + error);
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}
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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if (ioctl(sockfd, SIOCGIFMTU, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Get MTU error: " + error);
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}
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close(sockfd);
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return ifr.ifr_mtu;
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}
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std::expected<std::string, std::string> Interface::GetIP4Address(void) {
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Get MTU error: " + error);
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}
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ifr.ifr_addr.sa_family = AF_INET;
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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if (ioctl(sockfd, SIOCGIFADDR, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Get MTU error: " + error);
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}
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close(sockfd);
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auto sinaddr = ((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr;
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std::string addr = inet_ntoa(sinaddr);
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return addr;
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}
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std::expected<void, std::string> Interface::SetIP4Address(std::string ipaddr) {
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set address error: " + error);
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}
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ifr.ifr_addr.sa_family = AF_INET;
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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struct sockaddr_in* addr = (struct sockaddr_in *)&ifr.ifr_addr;
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addr->sin_family = AF_INET;
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if (inet_pton(AF_INET, ipaddr.c_str(), &addr->sin_addr) <= 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set address error: " + error);
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}
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if (ioctl(sockfd, SIOCSIFADDR, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set address error: " + error);
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}
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close(sockfd);
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return {};
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}
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std::expected<void, std::string> Interface::SetIP4Netmask(int prefix) {
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if (prefix < 0 || prefix > 32) {
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return std::unexpected("Invalid prefix");
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}
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uint32_t mask = (prefix == 0) ? 0 : (~0U << (32 - prefix));
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struct in_addr maskaddr;
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maskaddr.s_addr = htonl(mask);
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char buffer[INET_ADDRSTRLEN];
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if (inet_ntop(AF_INET, &maskaddr, buffer, sizeof(buffer)) == NULL) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set1 netmask error: " + error);
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}
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auto netmask = std::string(buffer);
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set2 netmask error: " + error);
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}
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ifr.ifr_addr.sa_family = AF_INET;
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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struct sockaddr_in* addr = (struct sockaddr_in *)&ifr.ifr_addr;
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addr->sin_family = AF_INET;
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if (inet_pton(AF_INET, netmask.c_str(), &addr->sin_addr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set3 netmask error: " + error);
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}
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if (ioctl(sockfd, SIOCSIFNETMASK, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set4 netmask error: " + error);
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}
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close(sockfd);
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return {};
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}
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std::expected<void, std::string> Interface::Up(void) {
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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ifr.ifr_flags |= (IFF_UP | IFF_RUNNING);
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if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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close(sockfd);
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return {};
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}
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std::expected<void, std::string> Interface::Down(void) {
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int sockfd = 0;
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if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, ifname.c_str(), IFNAMSIZ - 1);
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if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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ifr.ifr_flags &= ~IFF_UP;
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if (ioctl(sockfd, SIOCSIFFLAGS, &ifr) < 0) {
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close(sockfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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close(sockfd);
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return {};
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}
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std::expected<std::string, std::string> Interface::Read() {
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char buffer[mtu];
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int rsize = 0;
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if ((rsize = read(tunfd, buffer, sizeof(buffer))) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Read interface error: " + error);
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}
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std::string rdata;
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rdata.append(buffer, rsize);
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return rdata;
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}
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std::string Interface::Name() {
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return ifname;
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}
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int Interface::MTU() {
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return mtu;
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}
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Interface::~Interface() {
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close(tunfd);
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}
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std::expected<void, std::string> Interface::UpN(void) {
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int netlinkfd = 0;
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if ((netlinkfd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Create interface error: " + error);
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}
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struct {
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struct nlmsghdr header;
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struct ifinfomsg content;
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} request;
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memset(&request, 0, sizeof request);
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request.header.nlmsg_len = NLMSG_LENGTH(sizeof request.content);
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request.header.nlmsg_flags = NLM_F_REQUEST;
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request.header.nlmsg_type = RTM_NEWLINK;
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request.content.ifi_index = if_nametoindex(ifname.c_str());
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request.content.ifi_flags = IFF_UP;
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request.content.ifi_change = 1;
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if (send(netlinkfd, &request, request.header.nlmsg_len, 0) < 0) {
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close(netlinkfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Up interface error: " + error);
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}
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close(netlinkfd);
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return {};
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}
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std::expected<void, std::string> Interface::SetIP4AddrMask(const std::string address, const int prefix) {
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int netlinkfd = 0;
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if ((netlinkfd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, NETLINK_ROUTE)) < 0) {
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Create interface error: " + error);
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}
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int rc = 0;
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struct sockaddr_nl sockaddr;
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memset(&sockaddr, 0, sizeof sockaddr);
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sockaddr.nl_family = AF_NETLINK;
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if ((rc = bind(netlinkfd, (struct sockaddr*) &sockaddr, sizeof sockaddr))< 0) {
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close(netlinkfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set interface address error: " + error);
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}
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struct {
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struct nlmsghdr header;
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struct ifaddrmsg content;
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char attributes_buf[64];
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} request;
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struct rtattr *request_attr;
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size_t attributes_buf_avail = sizeof request.attributes_buf;
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memset(&request, 0, sizeof request);
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request.header.nlmsg_len = NLMSG_LENGTH(sizeof request.content);
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request.header.nlmsg_flags = NLM_F_REQUEST | NLM_F_EXCL | NLM_F_CREATE;
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request.header.nlmsg_type = RTM_NEWADDR;
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request.content.ifa_index = if_nametoindex(ifname.c_str());
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request.content.ifa_family = AF_INET;
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request.content.ifa_prefixlen = prefix;
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/* request.attributes[IFA_LOCAL] = address */
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request_attr = IFA_RTA(&request.content);
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request_attr->rta_type = IFA_LOCAL;
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request_attr->rta_len = RTA_LENGTH(sizeof (struct in_addr));
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request.header.nlmsg_len += request_attr->rta_len;
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inet_pton(AF_INET, address.c_str(), RTA_DATA(request_attr));
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/* request.attributes[IFA_ADDRESS] = address */
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request_attr = RTA_NEXT(request_attr, attributes_buf_avail);
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request_attr->rta_type = IFA_ADDRESS;
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request_attr->rta_len = RTA_LENGTH(sizeof (struct in_addr));
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request.header.nlmsg_len += request_attr->rta_len;
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inet_pton(AF_INET, address.c_str(), RTA_DATA(request_attr));
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if (send(netlinkfd, &request, request.header.nlmsg_len, 0) < 0) {
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close(netlinkfd);
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int errnocopy = errno;
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std::string error = std::strerror(errnocopy);
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return std::unexpected("Set interface address error: " + error);
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}
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close(netlinkfd);
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return {};
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}
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