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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <sys/socket.h>
#include <poll.h>
#include "macro.h"
#include "util.h"
#include "sd-rtnl.h"
#include "rtnl-internal.h"
static int sd_rtnl_new(sd_rtnl **ret) {
sd_rtnl *rtnl;
assert_return(ret, -EINVAL);
rtnl = new0(sd_rtnl, 1);
if (!rtnl)
return -ENOMEM;
rtnl->n_ref = REFCNT_INIT;
rtnl->fd = -1;
rtnl->sockaddr.nl.nl_family = AF_NETLINK;
rtnl->original_pid = getpid();
*ret = rtnl;
return 0;
}
static bool rtnl_pid_changed(sd_rtnl *rtnl) {
assert(rtnl);
/* We don't support people creating an rtnl connection and
* keeping it around over a fork(). Let's complain. */
return rtnl->original_pid != getpid();
}
int sd_rtnl_open(uint32_t groups, sd_rtnl **ret) {
_cleanup_sd_rtnl_unref_ sd_rtnl *rtnl = NULL;
socklen_t addrlen;
int r;
r = sd_rtnl_new(&rtnl);
if (r < 0)
return r;
rtnl->fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
if (rtnl->fd < 0)
return -errno;
rtnl->sockaddr.nl.nl_groups = groups;
addrlen = sizeof(rtnl->sockaddr);
r = bind(rtnl->fd, &rtnl->sockaddr.sa, addrlen);
if (r < 0)
return -errno;
r = getsockname(rtnl->fd, &rtnl->sockaddr.sa, &addrlen);
if (r < 0)
return r;
*ret = rtnl;
rtnl = NULL;
return 0;
}
sd_rtnl *sd_rtnl_ref(sd_rtnl *rtnl) {
if (rtnl)
assert_se(REFCNT_INC(rtnl->n_ref) >= 2);
return rtnl;
}
sd_rtnl *sd_rtnl_unref(sd_rtnl *rtnl) {
if (rtnl && REFCNT_DEC(rtnl->n_ref) <= 0) {
if (rtnl->fd >= 0)
close_nointr_nofail(rtnl->fd);
free(rtnl);
}
return NULL;
}
int sd_rtnl_send_with_reply_and_block(sd_rtnl *nl,
sd_rtnl_message *message,
uint64_t usec,
sd_rtnl_message **ret) {
struct pollfd p[1] = {};
struct timespec left;
usec_t timeout;
int r, serial;
assert_return(nl, -EINVAL);
assert_return(!rtnl_pid_changed(nl), -ECHILD);
assert_return(message, -EINVAL);
r = message_seal(nl, message);
if (r < 0)
return r;
serial = message_get_serial(message);
p[0].fd = nl->fd;
p[0].events = POLLOUT;
if (usec == (uint64_t) -1)
timeout = 0;
else if (usec == 0)
timeout = now(CLOCK_MONOTONIC) + RTNL_DEFAULT_TIMEOUT;
else
timeout = now(CLOCK_MONOTONIC) + usec;
for (;;) {
if (timeout) {
usec_t n;
n = now(CLOCK_MONOTONIC);
if (n >= timeout)
return -ETIMEDOUT;
timespec_store(&left, timeout - n);
}
r = ppoll(p, 1, timeout ? &left : NULL, NULL);
if (r < 0)
return 0;
r = socket_write_message(nl, message);
if (r < 0)
return r;
if (r > 0) {
break;
}
}
p[0].events = POLLIN;
for (;;) {
_cleanup_sd_rtnl_message_unref_ sd_rtnl_message *reply = NULL;
if (timeout) {
usec_t n;
n = now(CLOCK_MONOTONIC);
if (n >= timeout)
return -ETIMEDOUT;
timespec_store(&left, timeout - n);
}
r = ppoll(p, 1, timeout ? &left : NULL, NULL);
if (r < 0)
return r;
r = socket_read_message(nl, &reply);
if (r < 0)
return r;
if (r > 0) {
int received_serial = message_get_serial(reply);
if (received_serial == serial) {
r = message_get_errno(reply);
if (r < 0)
return r;
if (ret) {
*ret = reply;
reply = NULL;
}
break;;
}
}
}
return 0;
}
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