summaryrefslogtreecommitdiff
path: root/src/core/hostname-setup.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/core/hostname-setup.c')
-rw-r--r--src/core/hostname-setup.c187
1 files changed, 187 insertions, 0 deletions
diff --git a/src/core/hostname-setup.c b/src/core/hostname-setup.c
new file mode 100644
index 0000000000..550d3c2113
--- /dev/null
+++ b/src/core/hostname-setup.c
@@ -0,0 +1,187 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ 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 <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "hostname-setup.h"
+#include "macro.h"
+#include "util.h"
+#include "log.h"
+
+#if defined(TARGET_FEDORA) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA)
+#define FILENAME "/etc/sysconfig/network"
+#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE)
+#define FILENAME "/etc/HOSTNAME"
+#elif defined(TARGET_ARCH)
+#define FILENAME "/etc/rc.conf"
+#elif defined(TARGET_GENTOO)
+#define FILENAME "/etc/conf.d/hostname"
+#endif
+
+static int read_and_strip_hostname(const char *path, char **hn) {
+ char *s;
+ int r;
+
+ assert(path);
+ assert(hn);
+
+ if ((r = read_one_line_file(path, &s)) < 0)
+ return r;
+
+ hostname_cleanup(s);
+
+ if (isempty(s)) {
+ free(s);
+ return -ENOENT;
+ }
+
+ *hn = s;
+
+ return 0;
+}
+
+static int read_distro_hostname(char **hn) {
+
+#if defined(TARGET_FEDORA) || defined(TARGET_ARCH) || defined(TARGET_GENTOO) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA)
+ int r;
+ FILE *f;
+
+ assert(hn);
+
+ if (!(f = fopen(FILENAME, "re")))
+ return -errno;
+
+ for (;;) {
+ char line[LINE_MAX];
+ char *s, *k;
+
+ if (!fgets(line, sizeof(line), f)) {
+ if (feof(f))
+ break;
+
+ r = -errno;
+ goto finish;
+ }
+
+ s = strstrip(line);
+
+ if (!startswith_no_case(s, "HOSTNAME="))
+ continue;
+
+ if (!(k = strdup(s+9))) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ hostname_cleanup(k);
+
+ if (isempty(k)) {
+ free(k);
+ r = -ENOENT;
+ goto finish;
+ }
+
+ *hn = k;
+ r = 0;
+ goto finish;
+ }
+
+ r = -ENOENT;
+
+finish:
+ fclose(f);
+ return r;
+
+#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE)
+ return read_and_strip_hostname(FILENAME, hn);
+#else
+ return -ENOENT;
+#endif
+}
+
+static int read_hostname(char **hn) {
+ int r;
+
+ assert(hn);
+
+ /* First, try to load the generic hostname configuration file,
+ * that we support on all distributions */
+
+ if ((r = read_and_strip_hostname("/etc/hostname", hn)) < 0) {
+
+ if (r == -ENOENT)
+ return read_distro_hostname(hn);
+
+ return r;
+ }
+
+ return 0;
+}
+
+int hostname_setup(void) {
+ int r;
+ char *b = NULL;
+ const char *hn = NULL;
+
+ if ((r = read_hostname(&b)) < 0) {
+ if (r == -ENOENT)
+ log_info("No hostname configured.");
+ else
+ log_warning("Failed to read configured hostname: %s", strerror(-r));
+
+ hn = NULL;
+ } else
+ hn = b;
+
+ if (!hn) {
+ /* Don't override the hostname if it is unset and not
+ * explicitly configured */
+
+ char *old_hostname = NULL;
+
+ if ((old_hostname = gethostname_malloc())) {
+ bool already_set;
+
+ already_set = old_hostname[0] != 0;
+ free(old_hostname);
+
+ if (already_set)
+ goto finish;
+ }
+
+ hn = "localhost";
+ }
+
+ if (sethostname(hn, strlen(hn)) < 0) {
+ log_warning("Failed to set hostname to <%s>: %m", hn);
+ r = -errno;
+ } else
+ log_info("Set hostname to <%s>.", hn);
+
+finish:
+ free(b);
+
+ return r;
+}