i have written this sample program to get the interface address
but it seems to give me only the lo interface how do i get information
about the eth0 interface
can somebody gimme some pointers here
-SIGTERM
amit
--
As flies to wanton boys are we to the gods; they kill us for their sport.
-- Shakespeare, "King Lear"
#include<asm/types.h>
#include<sys/types.h>
//#include<bits/sockaddr.h>
#include<sys/socket.h>
#include<linux/netlink.h>
#include<linux/rtnetlink.h>
int main()
{
int sockfd =0;
int bindid =0;
char buff[1024];
char temp_addr[50];
int len =0;
struct {
struct nlmsghdr nl;
struct rtgenmsg g;
}req;
struct nlmsghdr *reply;
struct sockaddr_nl l_local;
struct sockaddr_nl l_sendto;
struct ifinfomsg *info;
struct ifaddrmsg *ifaddr;
struct rtattr *rta;
memset(buff,'\0',1024);
sockfd = socket(PF_NETLINK,SOCK_DGRAM,NETLINK_ROUTE);
l_local.nl_family = AF_NETLINK;
l_local.nl_groups = 0;
bindid = bind(sockfd,(struct sockaddr *)&l_local,sizeof(struct sockaddr_nl));
perror("Bind Result");
l_sendto.nl_family = AF_NETLINK;
req.nl.nlmsg_len = sizeof(req);
req.nl.nlmsg_type = RTM_GETADDR;
req.nl.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
req.nl.nlmsg_pid = 0;
req.nl.nlmsg_seq = 2;
req.g.rtgen_family = AF_INET;
// sendto(sockfd,(void *)&req,sizeof(req),0,(struct sockaddr *)&l_sendto,sizeof(struct sockaddr_nl));
send(sockfd, &req, req.nl.nlmsg_len, 0);
perror("sendto Result");
//while(recv(sockfd,buff,1024,0))
recv(sockfd,buff,1024,0);
perror("recvfrom Result");
reply = (struct nlmsghdr *)malloc(sizeof(struct nlmsghdr));
reply = (struct nlmsghdr *)buff;
printf("\nAfter cast\n");
// info = (struct ifinfomsg *)malloc(sizeof(struct ifinfomsg));
ifaddr = (struct ifaddrmsg *)malloc(sizeof(struct ifaddrmsg));
ifaddr = NLMSG_DATA(reply);
rta = (struct rtattr *)malloc(sizeof(struct rtattr));
rta = IFLA_RTA(ifaddr);
printf("\nAfter cast\n");
len = reply->nlmsg_len;
//RTA_OK(rta,len);
printf("Length is %d\n",len);
while(RTA_OK(rta, len)) {
switch(rta->rta_type) {
case IFA_LOCAL:
inet_ntop(AF_INET, RTA_DATA(rta), temp_addr, 50);
printf("addr: %s - \n", temp_addr);
break;
case IFA_ADDRESS:
inet_ntop(AF_INET, RTA_DATA(rta), temp_addr, 50);
printf("addr: %s - \n", temp_addr);
break;
case IFA_LABEL:
printf("InterFace Name: %s - \n",RTA_DATA(rta));
break;
case IFA_BROADCAST:
inet_ntop(AF_INET, RTA_DATA(rta), temp_addr, 50);
printf("addr: %s - \n", temp_addr);
break;
case IFA_ANYCAST:
inet_ntop(AF_INET, RTA_DATA(rta), temp_addr, 50);
printf("addr: %s - \n", temp_addr);
break;
case IFA_CACHEINFO:
printf("cache Info\n");
}
printf("\nLooping\n");
rta = RTA_NEXT(rta,len);
}
return 0;
}
