RE: Retrieving IP/MAC

[Andy Angrick]

With a lot of research and great help from a few on the list (thanks Luc)..
this is what i finally came up with for find out the IP and MAC address of
an interface in case anyone is interested.

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>

char *gethwaddr(char *device);
char *getipaddr(char *device);


int main(void){
printf("Hardware: %s\n",gethwaddr("eth0"));
printf("IP: %s\n",getipaddr("eth0"));
}


char *gethwaddr(char *device)
{
    int fd,i;
    static char ethaddr[8];
    struct ifreq ifr;
    unsigned char *txt;

    if((fd=socket(AF_INET,SOCK_DGRAM,0))<0)
        return 0;
    memset(&ifr,0,sizeof(ifr));
    strncpy(ifr.ifr_name,device,sizeof(ifr.ifr_name));

    if(ioctl(fd,SIOCGIFHWADDR,(char *)&ifr)==-1)
    {
        close(fd);
        return 0;
    }
    close(fd);
    txt=(unsigned char *)&ifr.ifr_hwaddr.sa_data;
    sprintf(ethaddr, "%.2X:%.2X:%.2X:%.2X:%.2X:%.2X", txt[0]&0x000000ff,\
      txt[1]&0x000000ff,txt[2]&0x000000ff,txt[3]&0x000000ff,\
      txt[4]&0x000000ff,txt[5]&0x000000ff);
    return ethaddr;
}

char *getipaddr(char *device)
{
    int fd,i;
    static char ipaddr[14];
    struct ifreq ifr;
    unsigned long int myip;
    char tmp[14]="",str[14]="";
    unsigned char *txt;

    if((fd=socket(AF_INET,SOCK_DGRAM,0))<0)
        return 0;
    memset(&ifr,0,sizeof(ifr));

    strncpy(ifr.ifr_name,device,sizeof(ifr.ifr_name));
    ifr.ifr_addr.sa_family = AF_INET;

    if(ioctl(fd,SIOCGIFADDR,(char *)&ifr)==-1)
      {
        close(fd);
        return 0;
      }
    close(fd);
    txt=(unsigned char *)&ifr.ifr_addr.sa_data;
    sprintf(ipaddr, "%d.%d.%d.%d", txt[2],txt[3],txt[4],txt[5]);
    return ipaddr;
}


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