/*-*- 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 #if defined(TARGET_FEDORA) #define FILENAME "/etc/sysconfig/network" #elif defined(TARGET_SUSE) || defined(TARGET_SLACKWARE) #define FILENAME "/etc/HOSTNAME" #elif defined(TARGET_DEBIAN) #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 == '_') *(d++) = *p; *d = 0; return s; } static int read_hostname(char **hn) { #if defined(TARGET_FEDORA) || defined(TARGET_ARCH) || defined(TARGET_GENTOO) 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; break; } r = 0; finish: fclose(f); return r; #elif defined(TARGET_SUSE) || defined(TARGET_DEBIAN) || defined(TARGET_SLACKWARE) int r; char *s, *k; assert(hn); if ((r = read_one_line_file(FILENAME, &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; #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; }