summaryrefslogtreecommitdiff
path: root/src/resolve/resolved-manager.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/resolve/resolved-manager.c')
-rw-r--r--src/resolve/resolved-manager.c275
1 files changed, 1 insertions, 274 deletions
diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index c35379aa39..23806aa30b 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -21,7 +21,6 @@
#include <netinet/in.h>
#include <poll.h>
-#include <resolv.h>
#include <sys/ioctl.h>
#include "af-list.h"
@@ -40,6 +39,7 @@
#include "resolved-conf.h"
#include "resolved-llmnr.h"
#include "resolved-manager.h"
+#include "resolved-resolv-conf.h"
#include "socket-util.h"
#include "string-table.h"
#include "string-util.h"
@@ -579,279 +579,6 @@ Manager *manager_free(Manager *m) {
return NULL;
}
-int manager_read_resolv_conf(Manager *m) {
- _cleanup_fclose_ FILE *f = NULL;
- struct stat st, own;
- char line[LINE_MAX];
- DnsServer *s;
- usec_t t;
- int r;
-
- assert(m);
-
- /* Reads the system /etc/resolv.conf, if it exists and is not
- * symlinked to our own resolv.conf instance */
-
- if (!m->read_resolv_conf)
- return 0;
-
- r = stat("/etc/resolv.conf", &st);
- if (r < 0) {
- if (errno == ENOENT)
- r = 0;
- else
- r = log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m");
- goto clear;
- }
-
- /* Have we already seen the file? */
- t = timespec_load(&st.st_mtim);
- if (t == m->resolv_conf_mtime)
- return 0;
-
- m->resolv_conf_mtime = t;
-
- /* Is it symlinked to our own file? */
- if (stat("/run/systemd/resolve/resolv.conf", &own) >= 0 &&
- st.st_dev == own.st_dev &&
- st.st_ino == own.st_ino) {
- r = 0;
- goto clear;
- }
-
- f = fopen("/etc/resolv.conf", "re");
- if (!f) {
- if (errno == ENOENT)
- r = 0;
- else
- r = log_warning_errno(errno, "Failed to open /etc/resolv.conf: %m");
- goto clear;
- }
-
- if (fstat(fileno(f), &st) < 0) {
- r = log_error_errno(errno, "Failed to stat open file: %m");
- goto clear;
- }
-
- manager_mark_dns_servers(m, DNS_SERVER_SYSTEM);
-
- FOREACH_LINE(line, f, r = -errno; goto clear) {
- _cleanup_strv_free_ char **d = NULL;
- const char *a;
- char *l;
-
- truncate_nl(line);
-
- l = strstrip(line);
- if (*l == '#' || *l == ';')
- continue;
-
- a = first_word(l, "nameserver");
- if (a) {
- r = manager_add_dns_server_by_string(m, DNS_SERVER_SYSTEM, a);
- if (r < 0)
- log_warning_errno(r, "Failed to parse DNS server address '%s', ignoring.", a);
-
- continue;
- }
- }
-
- manager_flush_marked_dns_servers(m, DNS_SERVER_SYSTEM);
-
- /* Whenever /etc/resolv.conf changes, start using the first
- * DNS server of it. This is useful to deal with broken
- * network managing implementations (like NetworkManager),
- * that when connecting to a VPN place both the VPN DNS
- * servers and the local ones in /etc/resolv.conf. Without
- * resetting the DNS server to use back to the first entry we
- * will continue to use the local one thus being unable to
- * resolve VPN domains. */
- manager_set_dns_server(m, m->dns_servers);
-
- return 0;
-
-clear:
- while (m->dns_servers) {
- s = m->dns_servers;
-
- LIST_REMOVE(servers, m->dns_servers, s);
- dns_server_unref(s);
- }
-
- return r;
-}
-
-static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) {
- _cleanup_free_ char *t = NULL;
- int r;
-
- assert(s);
- assert(f);
- assert(count);
-
- r = in_addr_to_string(s->family, &s->address, &t);
- if (r < 0) {
- log_warning_errno(r, "Invalid DNS address. Ignoring: %m");
- return;
- }
-
- if (*count == MAXNS)
- fputs("# Too many DNS servers configured, the following entries may be ignored.\n", f);
- (*count) ++;
-
- fprintf(f, "nameserver %s\n", t);
-}
-
-static void write_resolv_conf_search(
- const char *domain,
- FILE *f,
- unsigned *count,
- unsigned *length) {
-
- assert(domain);
- assert(f);
- assert(length);
-
- if (*count >= MAXDNSRCH ||
- *length + strlen(domain) > 256) {
- if (*count == MAXDNSRCH)
- fputs(" # Too many search domains configured, remaining ones ignored.", f);
- if (*length <= 256)
- fputs(" # Total length of all search domains is too long, remaining ones ignored.", f);
-
- return;
- }
-
- (*length) += strlen(domain);
- (*count) ++;
-
- fputc(' ', f);
- fputs(domain, f);
-}
-
-static int write_resolv_conf_contents(FILE *f, OrderedSet *dns, OrderedSet *domains) {
- Iterator i;
-
- fputs("# This file is managed by systemd-resolved(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);
-
- if (ordered_set_isempty(dns))
- fputs("# No DNS servers known.\n", f);
- else {
- unsigned count = 0;
- DnsServer *s;
-
- ORDERED_SET_FOREACH(s, dns, i)
- write_resolv_conf_server(s, f, &count);
- }
-
- if (!ordered_set_isempty(domains)) {
- unsigned length = 0, count = 0;
- char *domain;
-
- fputs("search", f);
- ORDERED_SET_FOREACH(domain, domains, i)
- write_resolv_conf_search(domain, f, &count, &length);
- fputs("\n", f);
- }
-
- return fflush_and_check(f);
-}
-
-int manager_write_resolv_conf(Manager *m) {
- static const char path[] = "/run/systemd/resolve/resolv.conf";
- _cleanup_free_ char *temp_path = NULL;
- _cleanup_fclose_ FILE *f = NULL;
- _cleanup_ordered_set_free_ OrderedSet *dns = NULL, *domains = NULL;
- DnsServer *s;
- Iterator i;
- Link *l;
- int r;
-
- assert(m);
-
- /* Read the system /etc/resolv.conf first */
- manager_read_resolv_conf(m);
-
- /* Add the full list to a set, to filter out duplicates */
- dns = ordered_set_new(&dns_server_hash_ops);
- if (!dns)
- return -ENOMEM;
-
- domains = ordered_set_new(&dns_name_hash_ops);
- if (!domains)
- return -ENOMEM;
-
- /* First add the system-wide servers and domains */
- LIST_FOREACH(servers, s, m->dns_servers) {
- r = ordered_set_put(dns, s);
- if (r == -EEXIST)
- continue;
- if (r < 0)
- return r;
- }
-
- /* Then, add the per-link servers and domains */
- HASHMAP_FOREACH(l, m->links, i) {
- char **domain;
-
- LIST_FOREACH(servers, s, l->dns_servers) {
- r = ordered_set_put(dns, s);
- if (r == -EEXIST)
- continue;
- if (r < 0)
- return r;
- }
-
- if (!l->unicast_scope)
- continue;
-
- STRV_FOREACH(domain, l->unicast_scope->domains) {
- r = ordered_set_put(domains, *domain);
- if (r == -EEXIST)
- continue;
- if (r < 0)
- return r;
- }
- }
-
- /* If we found nothing, add the fallback servers */
- if (ordered_set_isempty(dns)) {
- LIST_FOREACH(servers, s, m->fallback_dns_servers) {
- r = ordered_set_put(dns, s);
- if (r == -EEXIST)
- continue;
- if (r < 0)
- return r;
- }
- }
-
- r = fopen_temporary_label(path, path, &f, &temp_path);
- if (r < 0)
- return r;
-
- fchmod(fileno(f), 0644);
-
- r = write_resolv_conf_contents(f, dns, domains);
- if (r < 0)
- goto fail;
-
- if (rename(temp_path, path) < 0) {
- r = -errno;
- goto fail;
- }
-
- return 0;
-
-fail:
- (void) unlink(path);
- (void) unlink(temp_path);
- return r;
-}
-
int manager_recv(Manager *m, int fd, DnsProtocol protocol, DnsPacket **ret) {
_cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
union {
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-12 17:04:38 +0000