diff options
Diffstat (limited to 'src/dns-manager/nm-dns-bind.c')
| -rw-r--r-- | src/dns-manager/nm-dns-bind.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/src/dns-manager/nm-dns-bind.c b/src/dns-manager/nm-dns-bind.c new file mode 100644 index 0000000000..2e1ec67dec --- /dev/null +++ b/src/dns-manager/nm-dns-bind.c @@ -0,0 +1,527 @@ +/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */ +/* + * Copyright (C) 2010 Dan Williams <dcbw@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <stdlib.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <arpa/inet.h> +#include <sys/stat.h> + +#include <glib.h> +#include <glib/gi18n.h> + +#include "nm-dns-bind.h" +#include "nm-logging.h" +#include "nm-ip4-config.h" +#include "nm-ip6-config.h" + +G_DEFINE_TYPE (NMDnsBind, nm_dns_bind, NM_TYPE_DNS_PLUGIN) + +#define NM_DNS_BIND_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_DNS_BIND, NMDnsBindPrivate)) + +#define PIDFILE LOCALSTATEDIR "/run/nm-dns-named.pid" +#define CONFFILE LOCALSTATEDIR "/run/nm-dns-named.conf" + +typedef struct { + GPid pid; +} NMDnsBindPrivate; + +/*******************************************/ + +static inline const char * +find_bind (void) +{ + static const char *paths[] = { + "/usr/local/sbin/named", + "/usr/sbin/named", + "/sbin/named", + NULL + }; + const char **binary = paths; + + while (*binary != NULL) { + if (g_file_test (*binary, G_FILE_TEST_EXISTS)) + return *binary; + binary++; + } + return NULL; +} + +static gboolean +start_bind (NMDnsBind *self) +{ + const char *argv[10]; + + argv[0] = find_bind (); + argv[1] = "-f"; /* don't daemonize; stay in foreground */ + argv[2] = "-c"; + argv[3] = CONFFILE; + argv[4] = NULL; + + /* And finally spawn bind */ + return nm_dns_plugin_child_spawn (NM_DNS_PLUGIN (self), argv, PIDFILE, "bin/named"); +} + +/*******************************************/ + +static gboolean +find_address (GPtrArray *array, const char *addr) +{ + int n; + + for (n = 0; n < array->len; n++) { + if (g_strcmp0 ((const char*) g_ptr_array_index (array, n), addr) == 0) + return TRUE; + } + return FALSE; +} + +static void +add_ip4_nameservers (NMIP4Config *ip4, GPtrArray *array) +{ + int i; + + for (i = 0; i < nm_ip4_config_get_num_nameservers (ip4); i++) { + char buf[INET_ADDRSTRLEN + 1]; + struct in_addr addr; + + memset (&buf[0], 0, sizeof (buf)); + addr.s_addr = nm_ip4_config_get_nameserver (ip4, i); + if (inet_ntop (AF_INET, &addr, buf, sizeof (buf))) { + if (!find_address (array, buf)) + g_ptr_array_add (array, g_strdup (buf)); + } + } +} + +static gboolean +ip6_addr_to_string (const struct in6_addr *addr, char *buf, size_t buflen) +{ + /* inet_ntop is probably supposed to do this for us, but it doesn't */ + if (IN6_IS_ADDR_V4MAPPED (addr)) + return !!inet_ntop (AF_INET, &(addr->s6_addr32[3]), buf, buflen); + + return !!inet_ntop (AF_INET6, addr, buf, buflen); +} + +static void +add_ip6_nameservers (NMIP6Config *ip6, GPtrArray *array) +{ + char buf[INET6_ADDRSTRLEN + 1]; + int i; + + for (i = 0; i < nm_ip6_config_get_num_nameservers (ip6); i++) { + memset (buf, 0, sizeof (buf)); + if (ip6_addr_to_string (nm_ip6_config_get_nameserver (ip6, i), buf, sizeof (buf))) { + if (!find_address (array, buf)) + g_ptr_array_add (array, g_strdup (buf)); + } + } +} + +typedef struct { + guint32 dhash; + char *domain; + GPtrArray *servers; +} ZoneInfo; + +static ZoneInfo * +zone_new (const char *domain) +{ + ZoneInfo *info; + + g_return_val_if_fail (domain != NULL, NULL); + + info = g_malloc0 (sizeof (ZoneInfo)); + info->domain = g_strdup (domain); + info->dhash = g_str_hash (domain); + info->servers = g_ptr_array_sized_new (4); + return info; +} + +static void +zone_add_nameserver (ZoneInfo *info, const char *server) +{ + guint32 i; + + g_return_if_fail (info != NULL); + g_return_if_fail (server != NULL); + + for (i = 0; i < info->servers->len; i++) { + if (g_strcmp0 ((char *) g_ptr_array_index (info->servers, i), server) == 0) + return; + } + g_ptr_array_add (info->servers, g_strdup (server)); +} + +static void +zone_free (ZoneInfo *info) +{ + g_return_if_fail (info != NULL); + + g_free (info->domain); + g_ptr_array_foreach (info->servers, (GFunc) g_free, NULL); + g_ptr_array_free (info->servers, TRUE); + memset (info, 0, sizeof (ZoneInfo)); + g_free (info); +} + +static ZoneInfo * +find_zone (GPtrArray *zones, const char *domain) +{ + guint32 dhash, i; + + g_return_val_if_fail (domain != NULL, FALSE); + + dhash = g_str_hash (domain); + for (i = 0; i < zones->len; i++) { + ZoneInfo *zone = g_ptr_array_index (zones, i); + + if (zone->dhash == dhash) + return zone; + } + return NULL; +} + +static void +add_zone (GObject *ip, GPtrArray *zones) +{ + guint32 i, j, ns, nd, nn; + GPtrArray *to_add; + ZoneInfo *z; + + if (NM_IS_IP4_CONFIG (ip)) { + ns = nm_ip4_config_get_num_searches (NM_IP4_CONFIG (ip)); + nd = nm_ip4_config_get_num_domains (NM_IP4_CONFIG (ip)); + nn = nm_ip4_config_get_num_nameservers (NM_IP4_CONFIG (ip)); + } else if (NM_IS_IP6_CONFIG (ip)) { + ns = nm_ip6_config_get_num_searches (NM_IP6_CONFIG (ip)); + nd = nm_ip6_config_get_num_domains (NM_IP6_CONFIG (ip)); + nn = nm_ip6_config_get_num_nameservers (NM_IP6_CONFIG (ip)); + } else + g_assert_not_reached (); + + /* If we don't have any domains or searches, or we don't have any + * nameservers, we can't do split DNS for this config. + */ + if ((!nd && !ns) || !nn) + return; + + to_add = g_ptr_array_sized_new (MAX (ns, nd)); + + /* searches are preferred over domains */ + for (i = 0; i < ns; i++) { + const char *domain = NULL; + + if (NM_IS_IP4_CONFIG (ip)) + domain = nm_ip4_config_get_search (NM_IP4_CONFIG (ip), i); + else if (NM_IS_IP6_CONFIG (ip)) + domain = nm_ip6_config_get_search (NM_IP6_CONFIG (ip), i); + + z = find_zone (zones, domain); + if (!z) { + z = zone_new (domain); + g_ptr_array_add (zones, z); + } + g_ptr_array_add (to_add, z); + } + + if (ns == 0) { + /* If no searches, add any domains */ + for (i = 0; i < nd; i++) { + const char *domain = NULL; + + if (NM_IS_IP4_CONFIG (ip)) + domain = nm_ip4_config_get_domain (NM_IP4_CONFIG (ip), i); + else if (NM_IS_IP6_CONFIG (ip)) + domain = nm_ip6_config_get_domain (NM_IP6_CONFIG (ip), i); + + z = find_zone (zones, domain); + if (!z) { + z = zone_new (domain); + g_ptr_array_add (zones, z); + } + g_ptr_array_add (to_add, z); + } + } + + /* Now add the nameservers to every zone for this config */ + for (i = 0; i < nn; i++) { + char buf[INET6_ADDRSTRLEN + 1]; + struct in_addr addr4; + const struct in6_addr *addr6; + + memset (&buf[0], 0, sizeof (buf)); + + if (NM_IS_IP4_CONFIG (ip)) { + addr4.s_addr = nm_ip4_config_get_nameserver (NM_IP4_CONFIG (ip), i); + if (!inet_ntop (AF_INET, &addr4, buf, sizeof (buf))) + continue; + } else if (NM_IS_IP6_CONFIG (ip)) { + addr6 = nm_ip6_config_get_nameserver (NM_IP6_CONFIG (ip), i); + if (!ip6_addr_to_string (addr6, buf, sizeof (buf))) + continue; + } + + /* Add this nameserver to every zone from this IP config */ + for (j = 0; j < to_add->len; j++) { + z = g_ptr_array_index (to_add, j); + zone_add_nameserver (z, buf); + } + } + + g_ptr_array_free (to_add, TRUE); +} + +static gboolean +update (NMDnsPlugin *plugin, + const GSList *vpn_configs, + const GSList *dev_configs, + const GSList *other_configs, + const char *hostname) +{ + NMDnsBind *self = NM_DNS_BIND (plugin); + NMDnsBindPrivate *priv = NM_DNS_BIND_GET_PRIVATE (self); + GString *conf; + GPtrArray *globals, *zones; + GSList *iter; + GError *error = NULL; + int ignored, i, j; + gboolean success = FALSE; + + /* Build up the new bind config file */ + conf = g_string_sized_new (200); + globals = g_ptr_array_sized_new (6); + + /* If any of the VPN configs *don't* have domains or searches, then we + * dont' have any split DNS configuration for them, and we add them + * first in the global nameserver lists. Otherwise we add them later as + * split DNS zones. + */ + for (iter = (GSList *) vpn_configs; iter;iter = g_slist_next (iter)) { + if (NM_IS_IP4_CONFIG (iter->data)) { + NMIP4Config *ip4 = NM_IP4_CONFIG (iter->data); + + if (!nm_ip4_config_get_num_domains (ip4) && !nm_ip4_config_get_num_searches (ip4)) + add_ip4_nameservers (ip4, globals); + } else if (NM_IS_IP6_CONFIG (iter->data)) { + NMIP6Config *ip6 = NM_IP6_CONFIG (iter->data); + + if (!nm_ip6_config_get_num_domains (ip6) && !nm_ip6_config_get_num_searches (ip6)) + add_ip6_nameservers (ip6, globals); + } + } + + /* Get a list of global upstream servers with dupe checking */ + for (iter = (GSList *) dev_configs; iter;iter = g_slist_next (iter)) { + if (NM_IS_IP4_CONFIG (iter->data)) + add_ip4_nameservers (NM_IP4_CONFIG (iter->data), globals); + else if (NM_IS_IP6_CONFIG (iter->data)) + add_ip6_nameservers (NM_IP6_CONFIG (iter->data), globals); + } + + /* And any other random configs with dupe checking */ + for (iter = (GSList *) other_configs; iter;iter = g_slist_next (iter)) { + if (NM_IS_IP4_CONFIG (iter->data)) + add_ip4_nameservers (NM_IP4_CONFIG (iter->data), globals); + else if (NM_IS_IP6_CONFIG (iter->data)) + add_ip6_nameservers (NM_IP6_CONFIG (iter->data), globals); + } + + g_string_append (conf, + "options {\n" + " directory \"" LOCALSTATEDIR "/named\";\n" + " forward only;\n" + " recursion yes;\n" + " listen-on-v6 { ::1; };\n" + " listen-on { 127.0.0.1; };\n" + " forwarders {\n"); + + for (i = 0; i < globals->len; i++) { + char *ns = g_ptr_array_index (globals, i); + + g_string_append_printf (conf, " %s;\n", ns); + g_free (ns); + } + g_ptr_array_free (globals, TRUE); + + g_string_append (conf, + " };\n" + "};\n\n"); + + /* Build up the list of any split DNS zones, avoiding duplicates */ + zones = g_ptr_array_sized_new (4); + for (iter = (GSList *) vpn_configs; iter;iter = g_slist_next (iter)) { + if (NM_IS_IP4_CONFIG (iter->data)) + add_zone (G_OBJECT (iter->data), zones); + else if (NM_IS_IP6_CONFIG (iter->data)) + add_zone (G_OBJECT (iter->data), zones); + } + + /* Add all the zones to the config */ + for (i = 0; i < zones->len; i++) { + ZoneInfo *z = g_ptr_array_index (zones, i); + + g_string_append_printf (conf, + "zone \"%s\" IN {\n" + " type forward;\n" + " forward only;\n" + " forwarders {\n", + z->domain); + + /* Add each nameserver for this zone */ + for (j = 0; j < z->servers->len; j++) { + g_string_append_printf (conf, + " %s;\n", + (const char *) g_ptr_array_index (z->servers, j)); + } + + g_string_append (conf, + " };\n" + "};\n\n"); + + zone_free (z); + } + g_ptr_array_free (zones, TRUE); + + /* Write out the config file */ + if (!g_file_set_contents (CONFFILE, conf->str, -1, &error)) { + nm_log_warn (LOGD_DNS, "Failed to write named config file %s: (%d) %s", + CONFFILE, + error ? error->code : -1, + error && error->message ? error->message : "(unknown)"); + g_clear_error (&error); + goto out; + } + ignored = chmod (CONFFILE, 0600); + + nm_log_dbg (LOGD_DNS, "BIND local caching DNS configuration:"); + nm_log_dbg (LOGD_DNS, "%s", conf->str); + + if (priv->pid) { + /* Send it SIGHUP to reload the new configuration */ + if (kill (priv->pid, SIGHUP) == 0) + success = TRUE; + else { + /* Sigh... some error. Kill it and restart */ + nm_dns_plugin_child_kill (NM_DNS_PLUGIN (self)); + priv->pid = 0; + } + } + + if (!success) { + /* Spawn it */ + priv->pid = start_bind (self); + if (priv->pid) + success = TRUE; + } + +out: + g_string_free (conf, TRUE); + return success; +} + +/****************************************************************/ + +static void +child_quit (NMDnsPlugin *plugin, gint status) +{ + NMDnsBind *self = NM_DNS_BIND (plugin); + gboolean failed = TRUE; + int err; + + if (WIFEXITED (status)) { + err = WEXITSTATUS (status); + if (err) { + nm_log_warn (LOGD_DNS, "named exited with error %d", err); + } else + failed = FALSE; + } else if (WIFSTOPPED (status)) { + nm_log_warn (LOGD_DNS, "named stopped unexpectedly with signal %d", WSTOPSIG (status)); + } else if (WIFSIGNALED (status)) { + nm_log_warn (LOGD_DNS, "named died with signal %d", WTERMSIG (status)); + } else { + nm_log_warn (LOGD_DNS, "named died from an unknown cause"); + } + unlink (CONFFILE); + + if (failed) + g_signal_emit_by_name (self, NM_DNS_PLUGIN_FAILED); +} + +/****************************************************************/ + +static gboolean +init (NMDnsPlugin *plugin) +{ + return TRUE; +} + +static gboolean +is_caching (NMDnsPlugin *plugin) +{ + return TRUE; +} + +static const char * +get_name (NMDnsPlugin *plugin) +{ + return "bind"; +} + +/****************************************************************/ + +NMDnsBind * +nm_dns_bind_new (void) +{ + return (NMDnsBind *) g_object_new (NM_TYPE_DNS_BIND, NULL); +} + +static void +nm_dns_bind_init (NMDnsBind *self) +{ +} + +static void +dispose (GObject *object) +{ + unlink (CONFFILE); + + G_OBJECT_CLASS (nm_dns_bind_parent_class)->dispose (object); +} + +static void +nm_dns_bind_class_init (NMDnsBindClass *dns_class) +{ + NMDnsPluginClass *plugin_class = NM_DNS_PLUGIN_CLASS (dns_class); + GObjectClass *object_class = G_OBJECT_CLASS (dns_class); + + g_type_class_add_private (dns_class, sizeof (NMDnsBindPrivate)); + + object_class->dispose = dispose; + + plugin_class->init = init; + plugin_class->child_quit = child_quit; + plugin_class->is_caching = is_caching; + plugin_class->update = update; + plugin_class->get_name = get_name; +} + |