resolved: add daemon to manage resolv.conf

Also remove the equivalent functionality from networkd.

8 files changed, 2 insertions, 258 deletions

diff --git a/src/network/.gitignore b/src/network/.gitignore
index 04bce2e8b..885859648 100644
--- a/src/network/.gitignore
+++ b/src/network/.gitignore
@@ -1,4 +1,2 @@
 /networkd-network-gperf.c
 /networkd-netdev-gperf.c
-/networkd-gperf.c
-/networkd.conf
diff --git a/src/network/networkd-gperf.gperf b/src/network/networkd-gperf.gperf
deleted file mode 100644
index a5dfc400e..000000000
--- a/src/network/networkd-gperf.gperf
+++ /dev/null
@@ -1,17 +0,0 @@
-%{
-#include <stddef.h>
-#include "conf-parser.h"
-#include "networkd.h"
-%}
-struct ConfigPerfItem;
-%null_strings
-%language=ANSI-C
-%define slot-name section_and_lvalue
-%define hash-function-name networkd_gperf_hash
-%define lookup-function-name networkd_gperf_lookup
-%readonly-tables
-%omit-struct-type
-%struct-type
-%includes
-%%
-Network.DNS,                    config_parse_dnsv,     0, offsetof(Manager, fallback_dns)
diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c
index 8ce2dbd39..5a7472ba2 100644
--- a/src/network/networkd-link.c
+++ b/src/network/networkd-link.c
@@ -854,8 +854,6 @@ static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
         struct in_addr netmask;
         struct in_addr gateway;
         unsigned prefixlen;
-        struct in_addr *nameservers;
-        size_t nameservers_size;
         int r;
 
         assert(client);
@@ -920,15 +918,6 @@ static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
 
         link->dhcp_lease = lease;
 
-        if (link->network->dhcp_dns) {
-                r = sd_dhcp_lease_get_dns(lease, &nameservers, &nameservers_size);
-                if (r >= 0) {
-                        r = manager_update_resolv_conf(link->manager);
-                        if (r < 0)
-                                log_error_link(link, "Failed to update resolv.conf");
-                }
-        }
-
         if (link->network->dhcp_mtu) {
                 uint16_t mtu;
 
diff --git a/src/network/networkd-manager.c b/src/network/networkd-manager.c
index ad36553f2..2e3b4bb88 100644
--- a/src/network/networkd-manager.c
+++ b/src/network/networkd-manager.c
@@ -19,7 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  ***/
 
-#include <resolv.h>
+#include <sys/socket.h>
 #include <linux/if.h>
 #include <libkmod.h>
 
@@ -76,95 +76,6 @@ static int setup_signals(Manager *m) {
         return 0;
 }
 
-static int set_fallback_dns(Manager *m, const char *string) {
-        char *word, *state;
-        size_t length;
-        int r;
-
-        assert(m);
-        assert(string);
-
-        FOREACH_WORD_QUOTED(word, length, string, state) {
-                _cleanup_address_free_ Address *address = NULL;
-                Address *tail;
-                _cleanup_free_ char *addrstr = NULL;
-
-                r = address_new_dynamic(&address);
-                if (r < 0)
-                        return r;
-
-                addrstr = strndup(word, length);
-                if (!addrstr)
-                        return -ENOMEM;
-
-                r = net_parse_inaddr(addrstr, &address->family, &address->in_addr);
-                if (r < 0) {
-                        log_debug("Ignoring invalid DNS address '%s'", addrstr);
-                        continue;
-                }
-
-                LIST_FIND_TAIL(addresses, m->fallback_dns, tail);
-                LIST_INSERT_AFTER(addresses, m->fallback_dns, tail, address);
-                address = NULL;
-        }
-
-        return 0;
-}
-
-int config_parse_dnsv(
-                const char *unit,
-                const char *filename,
-                unsigned line,
-                const char *section,
-                unsigned section_line,
-                const char *lvalue,
-                int ltype,
-                const char *rvalue,
-                void *data,
-                void *userdata) {
-
-        Manager *m = userdata;
-        Address *address;
-
-        assert(filename);
-        assert(lvalue);
-        assert(rvalue);
-        assert(m);
-
-        while ((address = m->fallback_dns)) {
-                LIST_REMOVE(addresses, m->fallback_dns, address);
-                address_free(address);
-        }
-
-        set_fallback_dns(m, rvalue);
-
-        return 0;
-}
-
-static int manager_parse_config_file(Manager *m) {
-        static const char fn[] = "/etc/systemd/networkd.conf";
-        _cleanup_fclose_ FILE *f = NULL;
-        int r;
-
-        assert(m);
-
-        f = fopen(fn, "re");
-        if (!f) {
-                if (errno == ENOENT)
-                        return 0;
-
-                log_warning("Failed to open configuration file %s: %m", fn);
-                return -errno;
-        }
-
-        r = config_parse(NULL, fn, f, "Network\0", config_item_perf_lookup,
-                         (void*) networkd_gperf_lookup, false, false, m);
-        if (r < 0)
-                log_warning("Failed to parse configuration file: %s", strerror(-r));
-
-        return r;
-}
-
 int manager_new(Manager **ret) {
         _cleanup_manager_free_ Manager *m = NULL;
         int r;
@@ -177,14 +88,6 @@ int manager_new(Manager **ret) {
         if (!m->state_file)
                 return -ENOMEM;
 
-        r = set_fallback_dns(m, DNS_SERVERS);
-        if (r < 0)
-                return r;
-
-        r = manager_parse_config_file(m);
-        if (r < 0)
-                return r;
-
         r = sd_event_default(&m->event);
         if (r < 0)
                 return r;
@@ -241,7 +144,6 @@ void manager_free(Manager *m) {
         Network *network;
         NetDev *netdev;
         Link *link;
-        Address *address;
 
         if (!m)
                 return;
@@ -257,11 +159,6 @@ void manager_free(Manager *m) {
         sd_event_source_unref(m->sigint_event_source);
         sd_event_unref(m->event);
 
-        while ((address = m->fallback_dns)) {
-                LIST_REMOVE(addresses, m->fallback_dns, address);
-                address_free(address);
-        }
-
         while ((link = hashmap_first(m->links)))
                 link_unref(link);
         hashmap_free(m->links);
@@ -522,102 +419,6 @@ int manager_bus_listen(Manager *m) {
         return 0;
 }
 
-static void append_dns(FILE *f, struct in_addr *dns, unsigned char family, unsigned *count) {
-        char buf[INET6_ADDRSTRLEN];
-        const char *address;
-
-        address = inet_ntop(family, dns, buf, INET6_ADDRSTRLEN);
-        if (!address) {
-                log_warning("Invalid DNS address. Ignoring.");
-                return;
-        }
-
-        if (*count == MAXNS)
-                fputs("# Too many DNS servers configured, the following entries "
-                      "will be ignored\n", f);
-
-        fprintf(f, "nameserver %s\n", address);
-
-        (*count) ++;
-}
-
-int manager_update_resolv_conf(Manager *m) {
-        _cleanup_free_ char *temp_path = NULL;
-        _cleanup_fclose_ FILE *f = NULL;
-        Link *link;
-        Iterator i;
-        unsigned count = 0;
-        const char *domainname = NULL;
-        int r;
-
-        assert(m);
-
-        r = fopen_temporary("/run/systemd/network/resolv.conf", &f, &temp_path);
-        if (r < 0)
-                return r;
-
-        fchmod(fileno(f), 0644);
-
-        fputs("# This file is managed by systemd-networkd(8). Do not edit.\n#\n"
-              "# Third party programs must not access this file directly, but\n"
-              "# only through the symlink at /etc/resolv.conf. To manage\n"
-              "# resolv.conf(5) in a different way, replace the symlink by a\n"
-              "# static file or a different symlink.\n\n", f);
-
-        HASHMAP_FOREACH(link, m->links, i) {
-                if (link->dhcp_lease) {
-                        struct in_addr *nameservers;
-                        size_t nameservers_size;
-
-                        if (link->network->dhcp_dns) {
-                                r = sd_dhcp_lease_get_dns(link->dhcp_lease, &nameservers, &nameservers_size);
-                                if (r >= 0) {
-                                        unsigned j;
-
-                                        for (j = 0; j < nameservers_size; j++)
-                                                append_dns(f, &nameservers[j], AF_INET, &count);
-                                }
-                        }
-
-                        if (link->network->dhcp_domainname && !domainname) {
-                                r = sd_dhcp_lease_get_domainname(link->dhcp_lease, &domainname);
-                                if (r >= 0)
-                                       fprintf(f, "domain %s\n", domainname);
-                        }
-                }
-        }
-
-        HASHMAP_FOREACH(link, m->links, i) {
-                if (link->network && link->network->dns) {
-                        Address *address;
-
-                        LIST_FOREACH(addresses, address, link->network->dns) {
-                                append_dns(f, &address->in_addr.in,
-                                           address->family, &count);
-                        }
-                }
-        }
-
-        if (!count) {
-                Address *address;
-
-                LIST_FOREACH(addresses, address, m->fallback_dns)
-                        append_dns(f, &address->in_addr.in,
-                                   address->family, &count);
-        }
-
-        fflush(f);
-
-        if (ferror(f) || rename(temp_path, "/run/systemd/network/resolv.conf") < 0) {
-                r = -errno;
-                unlink("/run/systemd/network/resolv.conf");
-                unlink(temp_path);
-                return r;
-        }
-
-        return 0;
-}
-
 int manager_save(Manager *m) {
         Link *link;
         Iterator i;
diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index 12107c940..1b8856afe 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -235,7 +235,7 @@ int network_apply(Manager *manager, Network *network, Link *link) {
         link->network = network;
 
         if (network->dns) {
-                r = manager_update_resolv_conf(manager);
+                r = link_save(link);
                 if (r < 0)
                         return r;
         }
diff --git a/src/network/networkd.c b/src/network/networkd.c
index 6b3bf12a4..6985dcaa4 100644
--- a/src/network/networkd.c
+++ b/src/network/networkd.c
@@ -93,14 +93,6 @@ int main(int argc, char *argv[]) {
                 goto out;
         }
 
-        /* write out empty resolv.conf to avoid a
-         * dangling symlink */
-        r = manager_update_resolv_conf(m);
-        if (r < 0) {
-                log_error("Could not create resolv.conf: %s", strerror(-r));
-                goto out;
-        }
-
         sd_notify(false,
                   "READY=1\n"
                   "STATUS=Processing requests...");
diff --git a/src/network/networkd.conf.in b/src/network/networkd.conf.in
deleted file mode 100644
index efe889a44..000000000
--- a/src/network/networkd.conf.in
+++ /dev/null
@@ -1,11 +0,0 @@
-#  This file is part of systemd.
-#
-#  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.
-#
-# See networkd.conf(5) for details
-
-[Network]
-#DNS=@DNS_SERVERS@
diff --git a/src/network/networkd.h b/src/network/networkd.h
index 30a29c7b6..3e4e1f2ba 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -256,7 +256,6 @@ struct Manager {
         Hashmap *links;
         Hashmap *netdevs;
         LIST_HEAD(Network, networks);
-        LIST_HEAD(Address, fallback_dns);
 
         usec_t network_dirs_ts_usec;
         struct kmod_ctx *kmod_ctx;
@@ -278,18 +277,11 @@ int manager_rtnl_listen(Manager *m);
 int manager_udev_listen(Manager *m);
 int manager_bus_listen(Manager *m);
 
-int manager_update_resolv_conf(Manager *m);
 int manager_save(Manager *m);
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);
 #define _cleanup_manager_free_ _cleanup_(manager_freep)
 
-const struct ConfigPerfItem* networkd_gperf_lookup(const char *key, unsigned length);
-
-int config_parse_dnsv(const char *unit, const char *filename, unsigned line,
-                     const char *section, unsigned section_line, const char *lvalue,
-                     int ltype, const char *rvalue, void *data, void *userdata);
-
 /* NetDev */
 
 int netdev_load(Manager *manager);