src/core/hostname-setup.c

	hostname-setup.c revision cae356ad49b505a5172d4dbb830d7ec8f32a9953
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering/***
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  This file is part of systemd.
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  Copyright 2010 Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  systemd is free software; you can redistribute it and/or modify it
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  under the terms of the GNU Lesser General Public License as published by
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  the Free Software Foundation; either version 2.1 of the License, or
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  (at your option) any later version.
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  systemd is distributed in the hope that it will be useful, but
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  WITHOUT ANY WARRANTY; without even the implied warranty of
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  Lesser General Public License for more details.
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  You should have received a copy of the GNU Lesser General Public License
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering  along with systemd; If not, see <http://www.gnu.org/licenses/>.
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering***/
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include <unistd.h>
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include <stdio.h>
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include <errno.h>
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include <string.h>
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include <stdlib.h>
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include "hostname-setup.h"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include "macro.h"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include "util.h"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#include "log.h"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#if defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MAGEIA)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#define FILENAME "/etc/sysconfig/network"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#define FILENAME "/etc/HOSTNAME"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#elif defined(TARGET_ARCH)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#define FILENAME "/etc/rc.conf"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#elif defined(TARGET_GENTOO)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#define FILENAME "/etc/conf.d/hostname"
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#endif
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poetteringstatic int read_and_strip_hostname(const char *path, char **hn) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        char *s;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        int r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        assert(path);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        assert(hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        r = read_one_line_file(path, &s);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (r < 0)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                return r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        hostname_cleanup(s);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (isempty(s)) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                free(s);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                return -ENOENT;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        *hn = s;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        return 0;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering}
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poetteringstatic int read_distro_hostname(char **hn) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#if defined(TARGET_ARCH) || defined(TARGET_GENTOO) || defined(TARGET_ALTLINUX) || defined(TARGET_MANDRIVA) || defined(TARGET_MAGEIA)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        int r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        _cleanup_fclose_ FILE *f = NULL;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        assert(hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        f = fopen(FILENAME, "re");
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (!f)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                return -errno;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        for (;;) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                char line[LINE_MAX];
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                char *s, *k;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (!fgets(line, sizeof(line), f)) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        if (feof(f))
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                                break;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        r = -errno;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        goto finish;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                s = strstrip(line);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (!startswith_no_case(s, "HOSTNAME="))
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        continue;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                k = strdup(s+9);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (!k) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        r = -ENOMEM;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        goto finish;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                hostname_cleanup(k);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (isempty(k)) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        free(k);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        r = -ENOENT;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        goto finish;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                *hn = k;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                r = 0;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                goto finish;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        r = -ENOENT;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poetteringfinish:
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        return r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        return read_and_strip_hostname(FILENAME, hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#else
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        return -ENOENT;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering#endif
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering}
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poetteringstatic int read_hostname(char **hn) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        int r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        assert(hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        /* First, try to load the generic hostname configuration file,
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering         * that we support on all distributions */
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        r = read_and_strip_hostname("/etc/hostname", hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (r < 0) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (r == -ENOENT)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        return read_distro_hostname(hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
7f3fdb7f19a109fa3d1be92926bfe4cea1817da5Jakub Wilk                return r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        return 0;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering}
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poetteringint hostname_setup(void) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        int r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        char *b = NULL;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        const char *hn = NULL;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        bool enoent = false;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        r = read_hostname(&b);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (r < 0) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                hn = NULL;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (r == -ENOENT)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        enoent = true;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                else
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        log_warning("Failed to read configured hostname: %s", strerror(-r));
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        } else
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                hn = b;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (isempty(hn)) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                /* Don't override the hostname if it is already set
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                 * and not explicitly configured */
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (hostname_is_set())
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        goto finish;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                if (enoent)
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                        log_info("No hostname configured.");
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                hn = "localhost";
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        }
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        if (sethostname(hn, strlen(hn)) < 0) {
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                log_warning("Failed to set hostname to <%s>: %m", hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                r = -errno;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        } else
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering                log_info("Set hostname to <%s>.", hn);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poetteringfinish:
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        free(b);
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering        return r;
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering}
dc83f27a7cf03757dec11a69ec18504ad4ea8f89Lennart Poettering