mirror of
https://github.com/systemd/systemd.git
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142 lines
3.0 KiB
C
142 lines
3.0 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
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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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#define LINE_MAX 4096
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static int read_hostname(char **hn) {
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#if defined(TARGET_FEDORA)
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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("/etc/sysconfig/network", "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(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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*hn = k;
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break;
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}
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r = 0;
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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)
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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("/etc/HOSTNAME", &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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*hn = k;
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#elif defined(TARGET_DEBIAN)
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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("/etc/hostname", &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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*hn = k;
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#else
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#warning "Don't know how to read the hostname"
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return -ENOENT;
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#endif
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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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