/*-*- 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 Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser 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) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA) #define FILENAME "/etc/sysconfig/network" #elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE) #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 int read_and_strip_hostname(const char *path, char **hn) { char *s; int r; assert(path); assert(hn); if ((r = read_one_line_file(path, &s)) < 0) return r; hostname_cleanup(s); if (isempty(s)) { free(s); return -ENOENT; } *hn = s; 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) || defined(TARGET_MEEGO) || defined(TARGET_MAGEIA) 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; } hostname_cleanup(k); if (isempty(k)) { 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) 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; }