def nl_send_iovec(sk, msg, iov, _):
"""Transmit Netlink message.
https://github.com/thom311/libnl/blob/libnl3_2_25/lib/nl.c#L342
This function is identical to nl_send().
This function triggers the `NL_CB_MSG_OUT` callback.
Positional arguments:
sk -- Netlink socket (nl_sock class instance).
msg -- Netlink message (nl_msg class instance).
iov -- data payload to be sent (bytearray).
Returns:
Number of bytes sent on success or a negative error code.
"""
hdr = msghdr(msg_name=sk.s_peer, msg_iov=iov)
# Overwrite destination if specified in the message itself, defaults to the peer address of the socket.
dst = nlmsg_get_dst(msg)
if dst.nl_family == socket.AF_NETLINK:
hdr.msg_name = dst
# Add credentials if present.
creds = nlmsg_get_creds(msg)
if creds:
raise NotImplementedError # TODO https://github.com/Robpol86/libnl/issues/2
return nl_sendmsg(sk, msg, hdr)
def nl_send_iovec(sk, msg, iov, _):
"""Transmit Netlink message.
https://github.com/thom311/libnl/blob/libnl3_2_25/lib/nl.c#L342
This function is identical to nl_send().
This function triggers the `NL_CB_MSG_OUT` callback.
Positional arguments:
sk -- Netlink socket (nl_sock class instance).
msg -- Netlink message (nl_msg class instance).
iov -- data payload to be sent (bytearray).
Returns:
Number of bytes sent on success or a negative error code.
"""
hdr = msghdr(msg_name=sk.s_peer, msg_iov=iov)
# Overwrite destination if specified in the message itself, defaults to the peer address of the socket.
dst = nlmsg_get_dst(msg)
if dst.nl_family == socket.AF_NETLINK:
hdr.msg_name = dst
# Add credentials if present.
creds = nlmsg_get_creds(msg)
if creds:
raise NotImplementedError # TODO https://github.com/Robpol86/libnl/issues/2
return nl_sendmsg(sk, msg, hdr)
def test_error_nle_bad_sock():
"""Test for NLE_BAD_SOCK."""
sk = nl_socket_alloc()
msg = nlmsg_alloc_simple(0, 0)
nl_connect(sk, NETLINK_ROUTE)
sk.socket_instance.close()
nl_complete_msg(sk, msg)
message = 'Hello World!\n'
iov = bytes(message.encode('ascii'))
hdr = msghdr(msg_iov=iov)
assert -3 == nl_sendmsg(sk, msg, hdr)
def test_default(tcp_server):
r"""C code to test against.
// gcc a.c $(pkg-config --cflags --libs libnl-genl-3.0)
// (nc -l 2000 &); sleep 0.1; ./a.out
#include <netlink/msg.h>
struct nl_sock {
struct sockaddr_nl s_local; struct sockaddr_nl s_peer; int s_fd; int s_proto; unsigned int s_seq_next;
unsigned int s_seq_expect; int s_flags; struct nl_cb *s_cb; size_t s_bufsize;
};
int main() {
struct sockaddr_in sin = { .sin_port = htons(2000), .sin_family = AF_INET, };
sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int fd = socket(AF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockaddr *) &sin, sizeof(sin));
struct nl_sock *sk = nl_socket_alloc();
struct nl_msg *msg = nlmsg_alloc_simple(0, 0);
nl_connect(sk, NETLINK_ROUTE);
sk->s_fd = fd;
sk->s_local.nl_pid = 0;
nl_complete_msg(sk, msg);
char message[] = "Hello World!\n";
struct iovec iov = { .iov_base = message, .iov_len = sizeof(message), };
struct msghdr hdr = { .msg_iov = &iov, .msg_iovlen = 1, };
int ret = nl_sendmsg(sk, msg, &hdr);
printf("Bytes: %d\n", ret); // 14
return 0;
}
// Expected bash output:
// Hello World!
// Bytes: 14
"""
sk = nl_socket_alloc()
msg = nlmsg_alloc_simple(0, 0)
nl_connect(sk, NETLINK_ROUTE)
sk.socket_instance.close()
sk.socket_instance = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sk.socket_instance.connect(tcp_server.server.server_address)
sk.s_local.nl_pid = 0
nl_complete_msg(sk, msg)
message = 'Hello World!\n\0'
iov = bytes(message.encode('ascii'))
hdr = msghdr(msg_iov=iov)
assert 14 == nl_sendmsg(sk, msg, hdr)
assert [iov] == tcp_server.data
nl_socket_free(sk)
def test_socket(tcp_server):
r"""C code to test against.
// gcc a.c $(pkg-config --cflags --libs libnl-genl-3.0) && (nc -l 2000 |base64 &) && sleep 0.1 && ./a.out
#include <netlink/msg.h>
struct nl_sock {
struct sockaddr_nl s_local; struct sockaddr_nl s_peer; int s_fd; int s_proto; unsigned int s_seq_next;
unsigned int s_seq_expect; int s_flags; struct nl_cb *s_cb; size_t s_bufsize;
};
int main() {
struct nl_msg *msg = nlmsg_alloc();
struct nlmsghdr *nlh = nlmsg_hdr(msg);
printf("%d == nlh->nlmsg_len\n", nlh->nlmsg_len);
printf("%d == nlh->nlmsg_type\n", nlh->nlmsg_type);
printf("%d == nlh->nlmsg_flags\n", nlh->nlmsg_flags);
printf("%d == nlh->nlmsg_seq\n", nlh->nlmsg_seq);
printf("%d == nlh->nlmsg_pid\n", nlh->nlmsg_pid);
struct sockaddr_in sin = { .sin_port = htons(2000), .sin_family = AF_INET, };
sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int fd = socket(AF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockaddr *) &sin, sizeof(sin));
struct nl_sock *sk = nl_socket_alloc();
nl_connect(sk, NETLINK_ROUTE);
sk->s_fd = fd;
sk->s_local.nl_pid = 0;
sk->s_seq_next = 0;
nl_complete_msg(sk, msg);
printf("%d == nlh->nlmsg_seq\n", nlh->nlmsg_seq);
struct iovec iov = { .iov_base = nlh, .iov_len = nlh->nlmsg_len };
struct msghdr hdr = { .msg_iov = &iov, .msg_iovlen = 1, };
int ret = nl_sendmsg(sk, msg, &hdr);
printf("Bytes: %d\n", ret);
return 0;
}
// Expected bash output:
// 16 == nlh->nlmsg_len
// 0 == nlh->nlmsg_type
// 0 == nlh->nlmsg_flags
// 0 == nlh->nlmsg_seq
// 0 == nlh->nlmsg_pid
// 0 == nlh->nlmsg_seq
// Bytes: 16
// EAAAAAAABQAAAAAAAAAAAA==
"""
msg = nlmsg_alloc()
nlh = nlmsg_hdr(msg)
assert 16 == nlh.nlmsg_len
assert 0 == nlh.nlmsg_type
assert 0 == nlh.nlmsg_flags
assert 0 == nlh.nlmsg_seq
assert 0 == nlh.nlmsg_pid
sk = nl_socket_alloc()
nl_connect(sk, NETLINK_ROUTE)
sk.socket_instance.close()
sk.socket_instance = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sk.socket_instance.connect(tcp_server.server.server_address)
sk.s_local.nl_pid = 0
sk.s_seq_next = 0
nl_complete_msg(sk, msg)
assert 0 == nlh.nlmsg_seq
nlh.nlmsg_pid = 0 # sk.s_local.nl_pid is read-only in Python.
iov = nlh.bytearray[:nlh.nlmsg_len]
hdr = msghdr(msg_iov=iov)
assert 16 == nl_sendmsg(sk, msg, hdr)
assert 1 == len(tcp_server.data)
assert b'EAAAAAAABQAAAAAAAAAAAA==' == base64.b64encode(buffer(iov))
assert b'EAAAAAAABQAAAAAAAAAAAA==' == base64.b64encode(buffer(tcp_server.data[0]))
nl_socket_free(sk)
def test_socket(tcp_server):
r"""C code to test against.
// gcc a.c $(pkg-config --cflags --libs libnl-genl-3.0) && (nc -l 2000 |base64 &) && sleep 0.1 && ./a.out
#include <netlink/msg.h>
struct nl_sock {
struct sockaddr_nl s_local; struct sockaddr_nl s_peer; int s_fd; int s_proto; unsigned int s_seq_next;
unsigned int s_seq_expect; int s_flags; struct nl_cb *s_cb; size_t s_bufsize;
};
int main() {
struct nl_msg *msg = nlmsg_alloc();
printf("%d == nla_put_u32()\n", nla_put_u32(msg, 4, 8));
struct nlmsghdr *nlh = nlmsg_hdr(msg);
struct nlattr *attr = nlmsg_find_attr(nlh, 0, 4);
printf("%d == nla_type(attr)\n", nla_type(attr));
printf("%d == nla_get_u32(attr)\n", nla_get_u32(attr));
printf("%d == attr->nla_len\n", attr->nla_len);
struct sockaddr_in sin = { .sin_port = htons(2000), .sin_family = AF_INET, };
sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int fd = socket(AF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockaddr *) &sin, sizeof(sin));
struct nl_sock *sk = nl_socket_alloc();
nl_connect(sk, NETLINK_ROUTE);
sk->s_fd = fd;
sk->s_local.nl_pid = 0;
nl_complete_msg(sk, msg);
struct iovec iov = { .iov_base = attr, .iov_len = attr->nla_len };
struct msghdr hdr = { .msg_iov = &iov, .msg_iovlen = 1, };
int ret = nl_sendmsg(sk, msg, &hdr);
printf("Bytes: %d\n", ret); // 14
return 0;
}
// Expected bash output:
// 0 == nla_put_u32()
// 4 == nla_type(attr)
// 8 == nla_get_u32(attr)
// 8 == attr->nla_len
// Bytes: 8
// CAAEAAgAAAA=
"""
msg = nlmsg_alloc()
assert 0 == libnl.attr.nla_put_u32(msg, 4, 8)
nlh = nlmsg_hdr(msg)
attr = nlmsg_find_attr(nlh, 0, 4)
assert 4 == libnl.attr.nla_type(attr)
assert 8 == libnl.attr.nla_get_u32(attr)
assert 8 == attr.nla_len
sk = nl_socket_alloc()
nl_connect(sk, NETLINK_ROUTE)
sk.socket_instance.close()
sk.socket_instance = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sk.socket_instance.connect(tcp_server.server.server_address)
sk.s_local.nl_pid = 0
nl_complete_msg(sk, msg)
iov = attr.bytearray[:attr.nla_len]
hdr = msghdr(msg_iov=iov)
assert 8 == nl_sendmsg(sk, msg, hdr)
assert 1 == len(tcp_server.data)
assert b'CAAEAAgAAAA=' == base64.b64encode(buffer(iov))
assert b'CAAEAAgAAAA=' == base64.b64encode(buffer(tcp_server.data[0]))
nl_socket_free(sk)
def test_socket(tcp_server):
r"""C code to test against.
// gcc a.c $(pkg-config --cflags --libs libnl-genl-3.0) && (nc -l 2000 |base64 &) && sleep 0.1 && ./a.out
#include <netlink/msg.h>
struct nl_sock {
struct sockaddr_nl s_local; struct sockaddr_nl s_peer; int s_fd; int s_proto; unsigned int s_seq_next;
unsigned int s_seq_expect; int s_flags; struct nl_cb *s_cb; size_t s_bufsize;
};
int main() {
struct nl_msg *msg = nlmsg_alloc();
printf("%d == nla_put_u32()\n", nla_put_u32(msg, 4, 8));
struct nlmsghdr *nlh = nlmsg_hdr(msg);
struct nlattr *attr = nlmsg_find_attr(nlh, 0, 4);
printf("%d == nla_type(attr)\n", nla_type(attr));
printf("%d == nla_get_u32(attr)\n", nla_get_u32(attr));
printf("%d == attr->nla_len\n", attr->nla_len);
struct sockaddr_in sin = { .sin_port = htons(2000), .sin_family = AF_INET, };
sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int fd = socket(AF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockaddr *) &sin, sizeof(sin));
struct nl_sock *sk = nl_socket_alloc();
nl_connect(sk, NETLINK_ROUTE);
sk->s_fd = fd;
sk->s_local.nl_pid = 0;
nl_complete_msg(sk, msg);
struct iovec iov = { .iov_base = attr, .iov_len = attr->nla_len };
struct msghdr hdr = { .msg_iov = &iov, .msg_iovlen = 1, };
int ret = nl_sendmsg(sk, msg, &hdr);
printf("Bytes: %d\n", ret); // 14
return 0;
}
// Expected bash output:
// 0 == nla_put_u32()
// 4 == nla_type(attr)
// 8 == nla_get_u32(attr)
// 8 == attr->nla_len
// Bytes: 8
// CAAEAAgAAAA=
"""
msg = nlmsg_alloc()
assert 0 == libnl.attr.nla_put_u32(msg, 4, 8)
nlh = nlmsg_hdr(msg)
attr = nlmsg_find_attr(nlh, 0, 4)
assert 4 == libnl.attr.nla_type(attr)
assert 8 == libnl.attr.nla_get_u32(attr)
assert 8 == attr.nla_len
sk = nl_socket_alloc()
nl_connect(sk, NETLINK_ROUTE)
sk.socket_instance.close()
sk.socket_instance = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sk.socket_instance.connect(tcp_server.server.server_address)
sk.s_local.nl_pid = 0
nl_complete_msg(sk, msg)
iov = attr.bytearray[: attr.nla_len]
hdr = msghdr(msg_iov=iov)
assert 8 == nl_sendmsg(sk, msg, hdr)
assert 1 == len(tcp_server.data)
assert b"CAAEAAgAAAA=" == base64.b64encode(buffer(iov))
assert b"CAAEAAgAAAA=" == base64.b64encode(buffer(tcp_server.data[0]))
nl_socket_free(sk)
def test_socket(tcp_server):
r"""C code to test against.
// gcc a.c $(pkg-config --cflags --libs libnl-genl-3.0) && (nc -l 2000 |base64 &) && sleep 0.1 && ./a.out
#include <netlink/msg.h>
struct nl_sock {
struct sockaddr_nl s_local; struct sockaddr_nl s_peer; int s_fd; int s_proto; unsigned int s_seq_next;
unsigned int s_seq_expect; int s_flags; struct nl_cb *s_cb; size_t s_bufsize;
};
int main() {
struct nl_msg *msg = nlmsg_alloc();
struct nlmsghdr *nlh = nlmsg_hdr(msg);
printf("%d == nlh->nlmsg_len\n", nlh->nlmsg_len);
printf("%d == nlh->nlmsg_type\n", nlh->nlmsg_type);
printf("%d == nlh->nlmsg_flags\n", nlh->nlmsg_flags);
printf("%d == nlh->nlmsg_seq\n", nlh->nlmsg_seq);
printf("%d == nlh->nlmsg_pid\n", nlh->nlmsg_pid);
struct sockaddr_in sin = { .sin_port = htons(2000), .sin_family = AF_INET, };
sin.sin_addr.s_addr = inet_addr("127.0.0.1");
int fd = socket(AF_INET, SOCK_STREAM, 0);
connect(fd, (struct sockaddr *) &sin, sizeof(sin));
struct nl_sock *sk = nl_socket_alloc();
nl_connect(sk, NETLINK_ROUTE);
sk->s_fd = fd;
sk->s_local.nl_pid = 0;
sk->s_seq_next = 0;
nl_complete_msg(sk, msg);
printf("%d == nlh->nlmsg_seq\n", nlh->nlmsg_seq);
struct iovec iov = { .iov_base = nlh, .iov_len = nlh->nlmsg_len };
struct msghdr hdr = { .msg_iov = &iov, .msg_iovlen = 1, };
int ret = nl_sendmsg(sk, msg, &hdr);
printf("Bytes: %d\n", ret);
return 0;
}
// Expected bash output:
// 16 == nlh->nlmsg_len
// 0 == nlh->nlmsg_type
// 0 == nlh->nlmsg_flags
// 0 == nlh->nlmsg_seq
// 0 == nlh->nlmsg_pid
// 0 == nlh->nlmsg_seq
// Bytes: 16
// EAAAAAAABQAAAAAAAAAAAA==
"""
msg = nlmsg_alloc()
nlh = nlmsg_hdr(msg)
assert 16 == nlh.nlmsg_len
assert 0 == nlh.nlmsg_type
assert 0 == nlh.nlmsg_flags
assert 0 == nlh.nlmsg_seq
assert 0 == nlh.nlmsg_pid
sk = nl_socket_alloc()
nl_connect(sk, NETLINK_ROUTE)
sk.socket_instance.close()
sk.socket_instance = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sk.socket_instance.connect(tcp_server.server.server_address)
sk.s_local.nl_pid = 0
sk.s_seq_next = 0
nl_complete_msg(sk, msg)
assert 0 == nlh.nlmsg_seq
nlh.nlmsg_pid = 0 # sk.s_local.nl_pid is read-only in Python.
iov = nlh.bytearray[:nlh.nlmsg_len]
hdr = msghdr(msg_iov=iov)
assert 16 == nl_sendmsg(sk, msg, hdr)
assert 1 == len(tcp_server.data)
assert b'EAAAAAAABQAAAAAAAAAAAA==' == base64.b64encode(buffer(iov))
assert b'EAAAAAAABQAAAAAAAAAAAA==' == base64.b64encode(
buffer(tcp_server.data[0]))
nl_socket_free(sk)
