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* hostmngr.c - implementation file for network hosts management.
*
* Copyright (C) 2023 IOPSYS Software Solutions AB. All rights reserved.
*
* See LICENSE file for license related information.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if_arp.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <netlink/route/link.h>
#include <json-c/json.h>
#include <libubox/blobmsg.h>
#include <libubox/blobmsg_json.h>
#include <libubox/uloop.h>
#include <libubox/ustream.h>
#include <libubox/utils.h>
#include <libubus.h>
#include <easy/easy.h>
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#include "debug.h"
#include "timer.h"
#include "neigh.h"
#include "topology.h"
static int signal_pending;
static void topologyd_sighandler(int sig)
{
signal_pending = sig;
}
void enum_interfaces_cb(struct nl_object *obj, void *arg)
{
struct enum_interfaces_arg {
struct list_head *iflist;
int *n;
} *argp = arg;
struct ip_address ips[32] = {0};
struct local_interface *iface;
struct rtnl_link *link;
int num_ipaddrs = 32;
struct nl_addr *a;
int ret;
nl_object_get(obj);
link = (struct rtnl_link *)obj;
if (rtnl_link_get_arptype(link) == ARPHRD_VOID)
goto out;
iface = calloc(1, sizeof(*iface));
if (!iface) {
*argp->n = 0;
return;
}
strncpy(iface->ifname, rtnl_link_get_name(link), 16);
iface->ifindex = rtnl_link_get_ifindex(link);
a = rtnl_link_get_addr(link);
if (nl_addr_get_len(a) == 6)
memcpy(iface->macaddr, nl_addr_get_binary_addr(a), nl_addr_get_len(a));
iface->ifflags = rtnl_link_get_flags(link);
iface->operstate = rtnl_link_get_operstate(link);
iface->is_bridge = if_isbridge(iface->ifname);
if (!iface->is_bridge) {
int br_ifindex;
br_ifindex = if_isbridge_interface(iface->ifname);
if (br_ifindex > 0) {
iface->is_brif = true;
iface->brport = if_brportnum(iface->ifname);
iface->br_ifindex = br_ifindex;
}
}
ret = if_getaddrs(iface->ifname, ips, &num_ipaddrs);
if (!ret && num_ipaddrs > 0) {
iface->ipaddrs = calloc(num_ipaddrs, sizeof(struct ip_address));
if (iface->ipaddrs) {
iface->num_ipaddrs = num_ipaddrs;
memcpy(iface->ipaddrs, ips, num_ipaddrs * sizeof(struct ip_address));
}
}
if (is_wifi_interface(iface->ifname)) {
if (is_ap_interface(iface->ifname))
iface->is_ap = true;
} else {
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list_add_tail(&iface->list, argp->iflist);
*argp->n += 1;
out:
nl_object_put((struct nl_object *)link);
}
int enum_interfaces(struct list_head *head, int *num)
{
struct nl_cache *cache;
struct nl_sock *sk;
int ret = 0;
struct enum_interfaces_arg {
struct list_head *head;
int *n;
} arg = {
.head = head,
.n = num,
};
sk = nl_socket_alloc();
if (sk == NULL) {
ret = -errno;
return ret;
}
nl_connect(sk, NETLINK_ROUTE);
ret = rtnl_link_alloc_cache(sk, AF_UNSPEC, &cache);
if (ret) {
nl_socket_free(sk);
ret = -errno;
return -1;
}
nl_cache_foreach(cache, enum_interfaces_cb, &arg);
nl_cache_put(cache);
nl_socket_free(sk);
return 0;
}
int topology_enumerate_interfaces(struct topologyd_private *priv)
{
return enum_interfaces(&priv->iflist, &priv->num_local_interfaces);
}
void topology_print_interfaces(struct topologyd_private *priv)
{
struct local_interface *e;
int i = 0;
if (priv->num_local_interfaces == 0 || list_empty(&priv->iflist))
return;
list_for_each_entry(e, &priv->iflist, list) {
dbg("%d: ifname = %16s, mac = " MACFMT ", ifindex = %3d, flags = 0x%08x, opstate = 0x%02x, is-bridge = %d\n",
i++, e->ifname, MAC2STR(e->macaddr), e->ifindex,
e->ifflags, e->operstate, e->is_bridge);
}
}
#if 0
int topology_enumerate_interfaces_in_zone(struct topologyd_private *priv,
const char *zone, char *iflist,
int *num)
{
}
#endif
int topology_include_interface(struct topologyd_private *priv, const char *ifname)
if (if_isbridge(ifname)) {
char ifnames[32][16] = {0};
int n = 32;
int ret;
int i;
ret = br_get_iflist(ifname, &n, ifnames);
if (ret)
return -1;
list_for_each_entry(e, &priv->iflist, list) {
for (i = 0; i < n; i++) {
if (!strncmp(e->ifname, ifnames[i], strlen(e->ifname))) {
e->exclude = 0;
dbg("Include interface '%s'\n", e->ifname);
break;
}
}
}
}
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if (!strncmp(e->ifname, ifname, strlen(e->ifname))) {
e->exclude = 0;
dbg("Include interface '%s'\n", e->ifname);
break;
}
}
return 0;
}
int topology_exclude_interfaces(struct topologyd_private *priv, void *useropts)
{
struct topologyd_useropts *uopts = (struct topologyd_useropts *)useropts;
struct local_interface *e;
int i;
/* exclude interface(s) passed in cmdline */
if (!uopts || uopts->num_exclude == 0)
return 0;
list_for_each_entry(e, &priv->iflist, list) {
for (i = 0; i < uopts->num_exclude; i++) {
if (!strncmp(e->ifname, uopts->exclude_ifnames[i],
strlen(e->ifname))) {
e->exclude = 1;
break;
}
}
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}
return 0;
}
int topology_get_interface_neighbors(struct topologyd_private *priv)
{
struct local_interface *e;
if (priv->num_local_interfaces == 0 || list_empty(&priv->iflist))
return 0;
list_for_each_entry(e, &priv->iflist, list) {
if (e->exclude || hwaddr_is_zero(e->macaddr))
continue;
topologyd_get_known_neighbors(priv, e->ifname);
}
return 0;
}
void remove_newline(char *buf)
{
int len = strlen(buf) - 1;
if (buf[len] == '\n')
buf[len] = 0;
}
int read_dhcpv4_lease_table(void **clients, int *num_clients)
{
struct dhcp_clients {
uint8_t macaddr[6];
char ipv4[24];
char hostname[256];
unsigned long leasetime;
} *hosts = NULL, *tmp = NULL, *ptr;
FILE *f = NULL;
char line[256];
int cnt = 0;
int ret = 0;
f = fopen("/var/dhcp.leases", "r");
if (!f)
return -1;
while (fgets(line, sizeof(line), f) != NULL) {
unsigned long leasetime = 0;
char macaddr[18] = {0};
char ipaddr[24] = {0};
char hostname[256] = {0};
char clid[256] = {0};
remove_newline(line);
if (sscanf(line, "%lu %17s %23s %255s %255s", &leasetime,
ptr = realloc(hosts, (cnt + 1) * sizeof(struct dhcp_clients));
if (!ptr) {
if (hosts)
free(hosts);
tmp = hosts + cnt;
memset(tmp, 0, sizeof(struct dhcp_clients));
hwaddr_aton(macaddr, tmp->macaddr);
strncpy(tmp->ipv4, ipaddr, sizeof(ipaddr)-1);
strncpy(tmp->hostname, hostname, sizeof(hostname)-1);
tmp->leasetime = leasetime;
cnt += 1;
}
}
*clients = hosts;
*num_clients = cnt;
dbg("%s: num-dhcphosts = %d\n", __func__, *num_clients);
out:
fclose(f);
return ret;
}
void topology_update_hostname_of_neighbors(struct topologyd_private *priv,
void *dhclients, int num)
{
struct dhcp_clients {
uint8_t macaddr[6];
char ipv4[24];
char hostname[256];
unsigned long leasetime;
} *h, *hosts = (struct dhcp_clients *)dhclients;
struct neigh_entry *e = NULL;
struct neigh_ip_entry *ipn;
int i;
if (num == 0 || !hosts)
return;
for (i = 0; i < num; i++) {
h = hosts + i;
e = neigh_lookup(&priv->neigh_q, h->macaddr);
if (e) {
strncpy(e->hostname, h->hostname, sizeof(e->hostname) - 1);
inet_aton(h->ipv4, &e->ipv4.addr.ip4);
e->ipv4.family = AF_INET;
e->leasetime = h->leasetime;
e->ipv4_type_dhcp = 1;
ipn = neigh_ip_entry_lookup2(priv, &e->ipv4);
if (ipn) {
ipn->neigh = e;
memcpy(ipn->macaddr, e->macaddr, 6);
dbg("Host " MACFMT " with ip = %s (0x%x) added to iptable\n",
MAC2STR(e->macaddr), h->ipv4, e->ipv4.addr.ip4.s_addr);
}
}
}
}
int topology_get_neigh_hostname(struct neigh_queue *q, uint8_t *macaddr)
{
struct topologyd_private *priv = container_of(q, struct topologyd_private, neigh_q); //TODO:
struct dhcp_clients {
uint8_t macaddr[6];
char ipv4[24];
char hostname[256];
unsigned long leasetime;
} *h, *hosts;
struct neigh_entry *e = NULL;
struct neigh_ip_entry *ipn;
int i;
void *entries = NULL;
int num = 0;
int ret;
e = neigh_lookup(q, macaddr);
if (!e)
return -1;
ret = read_dhcpv4_lease_table(&entries, &num);
if (ret || num <= 0)
return -1;
dbg("%s: num-dhcphosts = %d\n", __func__, num);
hosts = (struct dhcp_clients *)entries;
for (i = 0; i < num; i++) {
h = hosts + i;
if (hwaddr_equal(h->macaddr, macaddr)) {
strncpy(e->hostname, h->hostname, sizeof(e->hostname) - 1);
inet_aton(h->ipv4, &e->ipv4.addr.ip4);
e->ipv4.family = AF_INET;
e->leasetime = h->leasetime;
e->ipv4_type_dhcp = 1;
ipn = neigh_ip_entry_lookup2(priv, &e->ipv4);
if (ipn) {
ipn->neigh = e;
memcpy(ipn->macaddr, e->macaddr, 6);
dbg("Host " MACFMT " with ip = %s (0x%x) added to iptable\n",
MAC2STR(e->macaddr), h->ipv4, e->ipv4.addr.ip4.s_addr);
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}
ret = 0;
break;
}
}
free(entries);
return ret;
}
int topology_get_neighbors_hostname(struct topologyd_private *priv)
{
void *entries = NULL;
int num = 0;
int ret;
ret = read_dhcpv4_lease_table(&entries, &num);
if (!ret && num > 0) {
topology_update_hostname_of_neighbors(priv, entries, num);
free(entries);
}
return 0;
}
int topology_register_notifier_file(struct topologyd_private *priv, const char *filename)
{
#if 0 //TODO
int wd;
priv->fd_dhcp4 = inotify_init1(IN_NONBLOCK);
if (priv->fd_dhcp4 == -1) {
dbg("Error: %s\n", strerror(errno));
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return -1;
}
wd = inotify_add_watch(fd, filename, IN_MODIFY);
if (wd == -1) {
close(priv->fd_dhcp4);
return -1;
}
//TODO; uloop_fd_add() etc.
#endif
return 0;
}
char *topology_brport_to_ifname(struct topologyd_private *priv, uint16_t brport)
{
struct local_interface *iface;
if (list_empty(&priv->iflist))
return NULL;
list_for_each_entry(iface, &priv->iflist, list) {
if (iface->is_brif && iface->brport == brport)
return iface->ifname;
}
return NULL;
}
struct local_interface *topologyd_ifname_to_interface(struct topologyd_private *priv,
const char *ifname)
{
struct local_interface *iface;
if (!ifname || !priv)
return NULL;
if (list_empty(&priv->iflist))
return NULL;
list_for_each_entry(iface, &priv->iflist, list) {
if (!strncmp(iface->ifname, ifname, 16))
return iface;
}
return NULL;
}
int topology_handle_ethport_carrier_off(struct topologyd_private *priv,
const char *ifname, int off)
{
if (!priv || !ifname)
return -1;
neigh_set_unreachable(&priv->neigh_q, ifname, off);
return 0;
}
void heartbeat_timer_cb(atimer_t *t)
{
struct topologyd_private *p = container_of(t, struct topologyd_private, hbtimer);
UNUSED(p);
switch (signal_pending) {
case SIGUSR2:
signal_pending = 0;
err("%s", "Received SIGUSR2\n");
break;
default:
break;
}
timer_set(t, 1000);
}
void topology_timer_cb(atimer_t *t)
{
//struct topologyd_private *p = container_of(t, struct topologyd_private, topotimer);
timer_set(t, 60000);
}
static void topologyd_periodic_refresh(atimer_t *t)
{
struct topologyd_private *p = container_of(t, struct topologyd_private, refreshtimer);
topologyd_get_1905_topology(p);
timer_set(t, 5000);
}
int topologyd_init_private(struct topologyd_private *priv, void *useropts)
{
int ret;
#if 0
priv->use_ieee1905 = false;
priv->i1905 = lookup_object(priv->bus, IEEE1905_OBJECT);
if (priv->i1905 != OBJECT_INVALID) {
dbg("%s: Successfully got %s object (id = %u)\n",
__func__, IEEE1905_OBJECT, priv->i1905);
priv->i1905_topology = lookup_object(priv->bus, IEEE1905_TOPOLOGY_OBJECT);
if (priv->i1905_topology != OBJECT_INVALID) {
dbg("%s: Successfully got %s object (id = %u)\n",
__func__, IEEE1905_TOPOLOGY_OBJECT, priv->i1905_topology);
priv->use_ieee1905 = true;
}
} else {
dbg("%s: Failed to get %s object\n", __func__, IEEE1905_OBJECT);
}
#endif
INIT_LIST_HEAD(&priv->iflist);
ret = topology_enumerate_interfaces(priv);
if (!ret)
topology_print_interfaces(priv);
topology_include_interface(priv, DEFAULT_LAN_IFNAME);
topology_exclude_interfaces(priv, useropts);
if (priv->cfg.history)
neigh_history_load_from_json_file(priv, priv->cfg.history_file);
topology_get_interface_neighbors(priv);
topology_get_neighbors_hostname(priv);
topology_register_notifier_file(priv, "/var/dhcp.leases");
nfct_get_entries_nolo(priv);
return ret;
}
void topologyd_exit_private(struct topologyd_private *priv)
{
if (priv->cfg.history)
neigh_history_store_to_json_file(priv, priv->cfg.history_file);
neigh_history_free(&priv->neigh_q);
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return;
}
int topologyd_init(void **priv, void *opts)
{
struct topologyd_useropts *uopts = (struct topologyd_useropts *)opts;
struct topologyd_private *p;
int ret;
set_sighandler(SIGUSR2, topologyd_sighandler);
set_sighandler(SIGPIPE, SIG_IGN);
/* and SIGINT/SIGTERM handlers from uloop cancel uloop */
*priv = NULL;
p = calloc(1, sizeof(struct topologyd_private));
if (!p)
return -1;
uloop_init();
p->bus = ubus_connect(uopts->ubus_sockpath);
if (!p->bus) {
err("Failed to connect to ubus\n");
goto out_err;
}
ubus_add_uloop(p->bus);
hostmngr_config_defaults(&p->cfg);
ret = hostmngr_reconfig(&p->cfg, uopts->confpath, uopts->conffile);
if (ret) {
err("Invalid config\n");
goto out_err;
}
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if (ret)
goto out_err;
ret = topologyd_publish_object(p, uopts->objname);
if (ret)
goto out_err;
ret = topologyd_register_local_events(p);
if (ret)
goto out_err;
ret = topologyd_register_nlevents(p);
if (ret)
goto out_err;
timer_init(&p->hbtimer, heartbeat_timer_cb);
timer_init(&p->topotimer, topology_timer_cb);
timer_init(&p->refreshtimer, topologyd_periodic_refresh);
timer_set(&p->hbtimer, 1000);
timer_set(&p->topotimer, 1500);
timer_set(&p->refreshtimer, 1000);
*priv = p;
return 0;
out_err:
uloop_done();
free(p);
return -1;
}
void topologyd_run(void *handle)
{
UNUSED(handle);
uloop_run();
}
int topologyd_exit(void *handle)
{
struct topologyd_private *priv = (struct topologyd_private *)handle;
if (!priv)
return 0;
timer_del(&priv->topotimer);
timer_del(&priv->hbtimer);
timer_del(&priv->refreshtimer);
topologyd_unregister_local_events(priv);
topologyd_unregister_nlevents(priv);
topologyd_remove_object(priv);
topologyd_exit_private(priv);
//topologyd_config_free(&priv->cfg);
ubus_free(priv->bus);
uloop_done();
free(priv);
{
struct topologyd_useropts *opts = (struct topologyd_useropts *)useropts;
void *ctx;
int ret;
if (opts->daemonize)
do_daemonize(opts->pidfile);
start_logging(opts);
ret = topologyd_init(&ctx, opts);
if (ret) {
err("%s : Failed to init.\n", HOSTS_OBJECT);