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Hello All,
I am facing a problem in using rtnetlink sockets and thought that
this mailing list would be the better to place to clarify.
Can anyone calrify my query.
When I tried deleting an interface, I have received message
RTM_NEWLINK (instead of RTM_DELLINK) from kernel.
I have executed the attached program and did "/sbin/ifdown eth0"..
and my program received a messsage RTM_NEWLINK from kernel
instead of RTM_DELLINK.
When I tried adding the interface "/sbin/ifup eth0".. it works fine
and received RTM_NEWLINK.
I would like to know whether anyone has faced this problem or
am I missing something in my program.
Thanks,
Rajesh.
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Content-Type: application/octet-stream;
name="rtnetlink.c"
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Content-Disposition: attachment;
filename="rtnetlink.c"
#include <unistd.h>=0A=
#include <fcntl.h>=0A=
#include <errno.h>=0A=
#include <stdio.h>=0A=
#include <bits/sockaddr.h>=0A=
#include <linux/in.h>=0A=
#include <sys/types.h>=0A=
#include <sys/socket.h>=0A=
#include <linux/netlink.h>=0A=
#include <linux/rtnetlink.h>=0A=
=0A=
struct iovec=0A=
{=0A=
void *iov_base; /* Pointer to data. */=0A=
size_t iov_len; /* Length of data. */=0A=
};=0A=
=0A=
=0A=
=0A=
main()=0A=
{=0A=
=0A=
int status;=0A=
int ret =3D 0;=0A=
int error;=0A=
struct sockaddr_nl bind_addr;=0A=
int rtnetlink_sk =3D socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);=0A=
=0A=
=0A=
bind_addr.nl_family =3D AF_NETLINK;=0A=
bind_addr.nl_pad =3D 0; =0A=
bind_addr.nl_pid =3D getpid();=0A=
bind_addr.nl_groups =3D ~0U;=0A=
=0A=
if (bind(rtnetlink_sk, (struct sockaddr *)&bind_addr,=0A=
sizeof(bind_addr)) < 0) {=0A=
perror("bind");=0A=
} =0A=
=0A=
while (1)=0A=
{=0A=
char buf[4096];=0A=
struct iovec iov =3D { buf, sizeof buf };=0A=
struct sockaddr_nl snl;=0A=
struct msghdr msg =3D { (void*)&snl, sizeof snl, &iov, 1, NULL, 0, =
0};=0A=
struct nlmsghdr *h;=0A=
=0A=
status =3D recvmsg (rtnetlink_sk, &msg, 0);=0A=
=0A=
if (status < 0)=0A=
{=0A=
if (errno =3D=3D EINTR)=0A=
continue;=0A=
if (errno =3D=3D EWOULDBLOCK)=0A=
break;=0A=
continue;=0A=
}=0A=
=0A=
if (status =3D=3D 0)=0A=
{=0A=
return -1;=0A=
}=0A=
=0A=
if (msg.msg_namelen !=3D sizeof snl)=0A=
{=0A=
return -1;=0A=
}=0A=
=0A=
for (h =3D (struct nlmsghdr *) buf; NLMSG_OK (h, status);=0A=
h =3D NLMSG_NEXT (h, status))=0A=
{=0A=
/* Finish of reading. */=0A=
if (h->nlmsg_type =3D=3D NLMSG_DONE)=0A=
return ret;=0A=
=0A=
/* Error handling. */=0A=
if (h->nlmsg_type =3D=3D NLMSG_ERROR)=0A=
{=0A=
struct nlmsgerr *err =3D (struct nlmsgerr *) NLMSG_DATA =
(h);=0A=
if (h->nlmsg_len < NLMSG_LENGTH (sizeof (struct nlmsgerr)))=0A=
{=0A=
=0A=
printf("Received error message that to with invalid length\n");=0A=
return ;=0A=
}=0A=
=0A=
return ;=0A=
}=0A=
=0A=
/* OK we received netlink message. */=0A=
=0A=
switch (h->nlmsg_type)=0A=
{=0A=
case RTM_NEWLINK:=0A=
{=0A=
printf("We are in NEWLINK ...\n");=0A=
break; =0A=
}=0A=
case RTM_DELLINK:=0A=
{=0A=
printf("We are in DELLINK ...\n");=0A=
break; =0A=
}=0A=
default: =0A=
break;=0A=
} =0A=
}=0A=
=0A=
/* After error care. */=0A=
if (msg.msg_flags & MSG_TRUNC)=0A=
{=0A=
continue;=0A=
}=0A=
if (status)=0A=
{=0A=
return -1;=0A=
}=0A=
}=0A=
return ret;=0A=
}=0A=
=0A=
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