199 lines
4.4 KiB
C
199 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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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)
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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 char* strip_bad_chars(char *s) {
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char *p, *d;
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for (p = s, d = s; *p; p++)
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if ((*p >= 'a' && *p <= 'z') ||
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(*p >= 'A' && *p <= 'Z') ||
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(*p >= '0' && *p <= '9') ||
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*p == '-' ||
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*p == '_' ||
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*p == '.')
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*(d++) = *p;
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*d = 0;
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return s;
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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)
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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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strip_bad_chars(k);
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if (k[0] == 0) {
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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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int r;
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char *s, *k;
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assert(hn);
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if ((r = read_one_line_file(FILENAME, &s)) < 0)
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return r;
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k = strdup(strstrip(s));
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free(s);
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if (!k)
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return -ENOMEM;
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strip_bad_chars(k);
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if (k[0] == 0) {
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free(k);
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return -ENOENT;
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}
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*hn = k;
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return 0;
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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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char *s, *k;
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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_one_line_file("/etc/hostname", &s)) < 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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k = strdup(strstrip(s));
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free(s);
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if (!k)
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return -ENOMEM;
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strip_bad_chars(k);
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if (k[0] == 0) {
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free(k);
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return -ENOENT;
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}
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*hn = k;
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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 *hn;
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if ((r = read_hostname(&hn)) < 0) {
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if (r != -ENOENT)
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log_warning("Failed to read configured hostname: %s", strerror(-r));
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return r;
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}
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r = sethostname(hn, strlen(hn)) < 0 ? -errno : 0;
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if (r < 0)
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log_warning("Failed to set hostname to <%s>: %s", hn, strerror(-r));
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else
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log_info("Set hostname to <%s>.", hn);
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free(hn);
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return r;
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}
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