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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2011 Lennart Poettering
Copyright 2014 Tom Gundersen
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 <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include "util.h"
#include "macro.h"
#include "strv.h"
#include "fileio.h"
#include "sd-network.h"
#include "dhcp-lease-internal.h"
_public_ int sd_network_get_link_state(unsigned index, char **state) {
_cleanup_free_ char *s = NULL, *p = NULL;
int r;
assert_return(index, -EINVAL);
assert_return(state, -EINVAL);
if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "STATE", &s, NULL);
if (r == -ENOENT)
return -ENODATA;
else if (r < 0)
return r;
else if (!s)
return -EIO;
if (streq(s, "unmanaged"))
return -EUNATCH;
*state = s;
s = NULL;
return 0;
}
_public_ int sd_network_get_dhcp_lease(unsigned index, sd_dhcp_lease **ret) {
sd_dhcp_lease *lease;
char *p, *s = NULL;
int r;
assert_return(index, -EINVAL);
assert_return(ret, -EINVAL);
if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0)
return -ENOMEM;
r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL);
free(p);
if (r < 0) {
free(s);
return r;
} else if (!s)
return -EIO;
r = dhcp_lease_load(s, &lease);
if (r < 0)
return r;
*ret = lease;
return 0;
}
_public_ int sd_network_get_ifindices(unsigned **indices) {
_cleanup_closedir_ DIR *d;
int r = 0;
unsigned n = 0;
_cleanup_free_ uid_t *l = NULL;
d = opendir("/run/systemd/network/links/");
if (!d)
return -errno;
for (;;) {
struct dirent *de;
int k;
unsigned index;
errno = 0;
de = readdir(d);
if (!de && errno != 0)
return -errno;
if (!de)
break;
dirent_ensure_type(d, de);
if (!dirent_is_file(de))
continue;
k = safe_atou(de->d_name, &index);
if (k < 0)
continue;
if (indices) {
if ((unsigned) r >= n) {
unsigned *t;
n = MAX(16, 2*r);
t = realloc(l, sizeof(unsigned) * n);
if (!t)
return -ENOMEM;
l = t;
}
assert((unsigned) r < n);
l[r++] = index;
} else
r++;
}
if (indices) {
*indices = l;
l = NULL;
}
return r;
}
static inline int MONITOR_TO_FD(sd_network_monitor *m) {
return (int) (unsigned long) m - 1;
}
static inline sd_network_monitor* FD_TO_MONITOR(int fd) {
return (sd_network_monitor*) (unsigned long) (fd + 1);
}
_public_ int sd_network_monitor_new(const char *category, sd_network_monitor **m) {
int fd, k;
bool good = false;
assert_return(m, -EINVAL);
fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
if (fd < 0)
return -errno;
if (!category || streq(category, "links")) {
k = inotify_add_watch(fd, "/run/systemd/network/links/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!category || streq(category, "leases")) {
k = inotify_add_watch(fd, "/run/systemd/network/leases/", IN_MOVED_TO|IN_DELETE);
if (k < 0) {
safe_close(fd);
return -errno;
}
good = true;
}
if (!good) {
close_nointr(fd);
return -EINVAL;
}
*m = FD_TO_MONITOR(fd);
return 0;
}
_public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) {
int fd;
assert_return(m, NULL);
fd = MONITOR_TO_FD(m);
close_nointr(fd);
return NULL;
}
_public_ int sd_network_monitor_flush(sd_network_monitor *m) {
assert_return(m, -EINVAL);
return flush_fd(MONITOR_TO_FD(m));
}
_public_ int sd_network_monitor_get_fd(sd_network_monitor *m) {
assert_return(m, -EINVAL);
return MONITOR_TO_FD(m);
}
_public_ int sd_network_monitor_get_events(sd_network_monitor *m) {
assert_return(m, -EINVAL);
/* For now we will only return POLLIN here, since we don't
* need anything else ever for inotify. However, let's have
* this API to keep our options open should we later on need
* it. */
return POLLIN;
}
_public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) {
assert_return(m, -EINVAL);
assert_return(timeout_usec, -EINVAL);
/* For now we will only return (uint64_t) -1, since we don't
* need any timeout. However, let's have this API to keep our
* options open should we later on need it. */
*timeout_usec = (uint64_t) -1;
return 0;
}
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