183 lines
4.4 KiB
C
183 lines
4.4 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include "hostname-setup.h"
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#include "macro.h"
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#include "util.h"
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#include "log.h"
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#if defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MAGEIA)
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#define FILENAME "/etc/sysconfig/network"
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#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE)
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#define FILENAME "/etc/HOSTNAME"
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#elif defined(TARGET_GENTOO)
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#define FILENAME "/etc/conf.d/hostname"
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#endif
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static int read_and_strip_hostname(const char *path, char **hn) {
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char *s;
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int r;
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assert(path);
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assert(hn);
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r = read_one_line_file(path, &s);
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if (r < 0)
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return r;
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hostname_cleanup(s);
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if (isempty(s)) {
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free(s);
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return -ENOENT;
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}
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*hn = s;
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return 0;
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}
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static int read_distro_hostname(char **hn) {
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#if defined(TARGET_GENTOO) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MAGEIA)
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int r;
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_cleanup_fclose_ FILE *f = NULL;
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assert(hn);
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f = fopen(FILENAME, "re");
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if (!f)
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return -errno;
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for (;;) {
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char line[LINE_MAX];
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char *s, *k;
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if (!fgets(line, sizeof(line), f)) {
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if (feof(f))
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break;
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r = -errno;
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goto finish;
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}
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s = strstrip(line);
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if (!startswith_no_case(s, "HOSTNAME="))
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continue;
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k = strdup(s+9);
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if (!k) {
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r = -ENOMEM;
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goto finish;
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}
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hostname_cleanup(k);
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if (isempty(k)) {
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free(k);
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r = -ENOENT;
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goto finish;
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}
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*hn = k;
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r = 0;
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goto finish;
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}
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r = -ENOENT;
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finish:
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return r;
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#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE)
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return read_and_strip_hostname(FILENAME, hn);
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#else
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return -ENOENT;
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#endif
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}
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static int read_hostname(char **hn) {
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int r;
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assert(hn);
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/* First, try to load the generic hostname configuration file,
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* that we support on all distributions */
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r = read_and_strip_hostname("/etc/hostname", hn);
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if (r < 0) {
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if (r == -ENOENT)
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return read_distro_hostname(hn);
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return r;
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}
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return 0;
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}
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int hostname_setup(void) {
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int r;
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char *b = NULL;
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const char *hn = NULL;
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bool enoent = false;
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r = read_hostname(&b);
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if (r < 0) {
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hn = NULL;
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if (r == -ENOENT)
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enoent = true;
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else
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log_warning("Failed to read configured hostname: %s", strerror(-r));
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} else
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hn = b;
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if (isempty(hn)) {
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/* Don't override the hostname if it is already set
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* and not explicitly configured */
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if (hostname_is_set())
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goto finish;
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if (enoent)
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log_info("No hostname configured.");
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hn = "localhost";
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}
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if (sethostname(hn, strlen(hn)) < 0) {
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log_warning("Failed to set hostname to <%s>: %m", hn);
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r = -errno;
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} else
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log_info("Set hostname to <%s>.", hn);
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finish:
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free(b);
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return r;
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}
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