diff options
Diffstat (limited to 'src/resolve/resolved-resolv-conf.c')
| -rw-r--r-- | src/resolve/resolved-resolv-conf.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/resolve/resolved-resolv-conf.c b/src/resolve/resolved-resolv-conf.c new file mode 100644 index 0000000000..5a6e3812df --- /dev/null +++ b/src/resolve/resolved-resolv-conf.c @@ -0,0 +1,306 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + This file is part of systemd. + + Copyright 2014 Tom Gundersen <teg@jklm.no> + + 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 <resolv.h> + +#include "alloc-util.h" +#include "dns-domain.h" +#include "fd-util.h" +#include "fileio-label.h" +#include "fileio.h" +#include "ordered-set.h" +#include "resolved-conf.h" +#include "resolved-resolv-conf.h" +#include "string-util.h" +#include "strv.h" + +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; +} |