diff options
Diffstat (limited to 'src/hostname-setup.c')
| -rw-r--r-- | src/hostname-setup.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/hostname-setup.c b/src/hostname-setup.c new file mode 100644 index 000000000..2c2f10cfd --- /dev/null +++ b/src/hostname-setup.c @@ -0,0 +1,187 @@ +/*-*- 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) || 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; +} |