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/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
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"
#define LINE_MAX 4096
static int read_hostname(char **hn) {
#if defined(TARGET_FEDORA)
int r;
FILE *f;
assert(hn);
if (!(f = fopen("/etc/sysconfig/network", "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(s, "HOSTNAME="))
continue;
if (!(k = strdup(s+9))) {
r = -ENOMEM;
goto finish;
}
*hn = k;
break;
}
r = 0;
finish:
fclose(f);
return r;
#elif defined(TARGET_ARCH)
int r;
FILE *f;
assert(hn);
if (!(f = fopen("/etc/rc.conf", "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(s, "HOSTNAME="))
continue;
if (!(k = strdup(s+9))) {
r = -ENOMEM;
goto finish;
}
*hn = k;
break;
}
r = 0;
finish:
fclose(f);
return r;
#elif defined(TARGET_SUSE)
int r;
char *s, *k;
assert(hn);
if ((r = read_one_line_file("/etc/HOSTNAME", &s)) < 0)
return r;
k = strdup(strstrip(s));
free(s);
if (!k)
return -ENOMEM;
*hn = k;
#elif defined(TARGET_DEBIAN)
int r;
char *s, *k;
assert(hn);
if ((r = read_one_line_file("/etc/hostname", &s)) < 0)
return r;
k = strdup(strstrip(s));
free(s);
if (!k)
return -ENOMEM;
*hn = k;
#else
#warning "Don't know how to read the hostname"
return -ENOENT;
#endif
return 0;
}
int hostname_setup(void) {
int r;
char *hn;
if ((r = read_hostname(&hn)) < 0) {
if (r != -ENOENT)
log_warning("Failed to read configured hostname: %s", strerror(-r));
return r;
}
r = sethostname(hn, strlen(hn)) < 0 ? -errno : 0;
if (r < 0)
log_warning("Failed to set hostname to <%s>: %s", hn, strerror(-r));
else
log_info("Set hostname to <%s>.", hn);
free(hn);
return r;
}
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