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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <ifaddrs.h>
#include <arpa/inet.h>
#ifdef __linux__
#include <netpacket/packet.h>
#include <net/ethernet.h>
#else
#include <net/if_dl.h>
#endif
#include "interface_addresses.h"
extern "C" uint32_t getBitCountFromIPv4Mask(uint32_t mask) {
return __builtin_popcount(mask);
}
extern "C" uint32_t getBitCountFromIPv6Mask(const in6_addr &mask) {
uint32_t bitCount = 0;
for (uint32_t ii = 0; ii < 4; ii++) {
bitCount += __builtin_popcount(mask.s6_addr32[ii]);
}
return bitCount;
}
extern "C" NetworkInterface *getNetworkInterfaces() {
NetworkInterface *interfaces = (NetworkInterface*) malloc(sizeof(NetworkInterface));
if (interfaces == NULL) return NULL;
short interfacesIndex = -1;
struct ifaddrs *ifap, *ifa;
unsigned char *ptr;
getifaddrs (&ifap);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr && ifa->ifa_addr->sa_family==AF_INET) {
struct sockaddr_in *sa = (struct sockaddr_in *) ifa->ifa_addr;
char addr[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &(sa->sin_addr), addr, sizeof(addr));
char netmask[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &(((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr), netmask, sizeof(netmask));
char *interface_name = ifa->ifa_name;
interfacesIndex++;
if (interfacesIndex > 0) {
interfaces = (NetworkInterface*) realloc(interfaces, (interfacesIndex+1) * sizeof(NetworkInterface));
if (interfaces == NULL) return NULL;
}
interfaces[interfacesIndex].address = strdup(addr);
if (interfaces[interfacesIndex].address == NULL) return NULL;
interfaces[interfacesIndex].netmask = strdup(netmask);
if (interfaces[interfacesIndex].netmask == NULL) return NULL;
interfaces[interfacesIndex].interface = strdup(interface_name);
if (interfaces[interfacesIndex].interface == NULL) return NULL;
interfaces[interfacesIndex].family = (char*) malloc(strlen("IPv4")+1);
memcpy(interfaces[interfacesIndex].family, "IPv4", strlen("IPv4"));
interfaces[interfacesIndex].family[strlen("IPv4")] = '\0';
interfaces[interfacesIndex].cidr = getBitCountFromIPv4Mask(((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr.s_addr);
interfaces[interfacesIndex].internal = !!(ifa->ifa_flags & 0x8);
} else if (ifa->ifa_addr && ifa->ifa_addr->sa_family==AF_INET6) {
struct sockaddr_in6 *sa = (struct sockaddr_in6 *) ifa->ifa_addr;
char addr[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &(sa->sin6_addr), addr, sizeof(addr));
char netmask[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, &(((struct sockaddr_in6 *) ifa->ifa_netmask)->sin6_addr), netmask, sizeof(netmask));
char *interface_name = ifa->ifa_name;
interfacesIndex++;
if (interfacesIndex > 0) {
interfaces = (NetworkInterface*) realloc(interfaces, (interfacesIndex+1) * sizeof(NetworkInterface));
if (interfaces == NULL) return NULL;
}
interfaces[interfacesIndex].address = strdup(addr);
if (interfaces[interfacesIndex].address == NULL) return NULL;
interfaces[interfacesIndex].netmask = strdup(netmask);
if (interfaces[interfacesIndex].netmask == NULL) return NULL;
interfaces[interfacesIndex].interface = interface_name;
if (interfaces[interfacesIndex].interface == NULL) return NULL;
interfaces[interfacesIndex].family = (char*) malloc(strlen("IPv6")+1);
memcpy(interfaces[interfacesIndex].family, "IPv6", strlen("IPv6"));
interfaces[interfacesIndex].family[strlen("IPv6")] = '\0';
interfaces[interfacesIndex].cidr = getBitCountFromIPv6Mask(sa->sin6_addr);
interfaces[interfacesIndex].scopeid = sa->sin6_scope_id;
interfaces[interfacesIndex].internal = !!(ifa->ifa_flags & 0x8);
}
}
interfacesIndex++;
interfaces = (NetworkInterface*) realloc(interfaces, (interfacesIndex+1) * sizeof(NetworkInterface));
if (interfaces == NULL) return NULL;
interfaces[interfacesIndex] = (NetworkInterface) {NULL, NULL, NULL, NULL, NULL, 0};
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
#ifdef __linux__
if (ifa->ifa_addr && ifa->ifa_addr->sa_family==AF_PACKET) {
char macp[INET6_ADDRSTRLEN];
struct sockaddr_ll *s = (struct sockaddr_ll *) ifa->ifa_addr;
int i;
int len = 0;
for (i = 0; i < 6; i++) {
len += sprintf(macp+len, "%02X%s", s->sll_addr[i], i < 5 ? ":":"");
}
i = 0;
int arrLength = getNetworkInterfaceArrayLen(interfaces);
for (; i < arrLength; i++) {
if (strcmp(interfaces[i].interface, (ifa)->ifa_name) == 0) {
interfaces[i].mac = strdup(macp);
if (interfaces[i].mac == NULL) return NULL;
}
}
}
#else
if (ifa->ifa_addr && ifa->ifa_addr->sa_family==AF_LINK) {
char macp[18];
ptr = (unsigned char *)LLADDR((struct sockaddr_dl *)(ifa)->ifa_addr);
sprintf(macp, "%02x:%02x:%02x:%02x:%02x:%02x", *ptr, *(ptr+1), *(ptr+2), *(ptr+3), *(ptr+4), *(ptr+5));
int arrLength = getNetworkInterfaceArrayLen(interfaces);
for (int i = 0; i < arrLength; i++) {
if (strcmp(interfaces[i].interface, (ifa)->ifa_name) == 0) {
interfaces[i].mac = strdup(macp);
if (interfaces[i].mac == NULL) return NULL;
}
}
}
#endif
}
freeifaddrs(ifap);
return interfaces;
}
extern "C" int getNetworkInterfaceArrayLen(NetworkInterface *arr) {
int i = 0;
for (; arr[i].address != NULL; i++);
return i;
}
extern "C" void freeNetworkInterfaceArray(NetworkInterface *arr, int len)
{
for (int i = 0; i < len; i++) {
free(arr[i].address);
free(arr[i].family);
free(arr[i].interface);
free(arr[i].mac);
free(arr[i].netmask);
}
free(arr);
}
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