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/*-*- 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 General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU 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)
#define FILENAME "/etc/sysconfig/network"
#elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE) || defined(TARGET_FRUGALWARE)
#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 char* strip_bad_chars(char *s) {
char *p, *d;
for (p = s, d = s; *p; p++)
if ((*p >= 'a' && *p <= 'z') ||
(*p >= 'A' && *p <= 'Z') ||
(*p >= '0' && *p <= '9') ||
*p == '-' ||
*p == '_' ||
*p == '.')
*(d++) = *p;
*d = 0;
return s;
}
static int read_and_strip_hostname(const char *path, char **hn) {
char *s, *k;
int r;
assert(path);
assert(hn);
if ((r = read_one_line_file(path, &s)) < 0)
return r;
k = strdup(strstrip(s));
free(s);
if (!k)
return -ENOMEM;
strip_bad_chars(k);
if (k[0] == 0) {
free(k);
return -ENOENT;
}
*hn = k;
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)
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;
}
strip_bad_chars(k);
if (k[0] == 0) {
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) || defined(TARGET_FRUGALWARE)
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;
}
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