RASCSI/cpp/shared/network_util.cpp

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//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2023 Uwe Seimet
//
//---------------------------------------------------------------------------
#include "network_util.h"
#include <cstring>
#include <ifaddrs.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <unistd.h>
#include <netdb.h>
#include <unistd.h>
using namespace std;
bool network_util::IsInterfaceUp(const string& interface)
{
ifreq ifr = {};
strncpy(ifr.ifr_name, interface.c_str(), IFNAMSIZ - 1); //NOSONAR Using strncpy is safe
const int fd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
if (!ioctl(fd, SIOCGIFFLAGS, &ifr) && (ifr.ifr_flags & IFF_UP)) {
close(fd);
return true;
}
close(fd);
return false;
}
set<string, less<>> network_util::GetNetworkInterfaces()
{
set<string, less<>> network_interfaces;
#ifdef __linux__
ifaddrs *addrs;
getifaddrs(&addrs);
ifaddrs *tmp = addrs;
while (tmp) {
if (const string name = tmp->ifa_name; tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_PACKET &&
name != "lo" && name != "piscsi_bridge" && !name.starts_with("dummy") && IsInterfaceUp(name)) {
// Only list interfaces that are up
network_interfaces.insert(name);
}
tmp = tmp->ifa_next;
}
freeifaddrs(addrs);
#endif
return network_interfaces;
}
bool network_util::ResolveHostName(const string& host, sockaddr_in *addr)
{
addrinfo hints = {};
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
if (addrinfo *result; !getaddrinfo(host.c_str(), nullptr, &hints, &result)) {
*addr = *reinterpret_cast<sockaddr_in *>(result->ai_addr); //NOSONAR bit_cast is not supported by the bullseye compiler
freeaddrinfo(result);
return true;
}
return false;
}