5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
188 lines
4.7 KiB
C
188 lines
4.7 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_FEDORA) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MEEGO) || 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_ARCH)
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#define FILENAME "/etc/rc.conf"
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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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if ((r = read_one_line_file(path, &s)) < 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_FEDORA) || defined(TARGET_ARCH) || defined(TARGET_GENTOO) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA)
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int r;
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FILE *f;
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assert(hn);
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if (!(f = fopen(FILENAME, "re")))
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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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if (!(k = strdup(s+9))) {
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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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fclose(f);
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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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if ((r = read_and_strip_hostname("/etc/hostname", hn)) < 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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if ((r = read_hostname(&b)) < 0) {
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if (r == -ENOENT)
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log_info("No hostname configured.");
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else
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log_warning("Failed to read configured hostname: %s", strerror(-r));
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hn = NULL;
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} else
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hn = b;
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if (!hn) {
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/* Don't override the hostname if it is unset and not
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* explicitly configured */
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char *old_hostname = NULL;
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if ((old_hostname = gethostname_malloc())) {
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bool already_set;
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already_set = old_hostname[0] != 0;
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free(old_hostname);
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if (already_set)
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goto finish;
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}
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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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