./move.sh

1 files changed, 224 insertions, 0 deletions

diff --git a/src/libbasic/hostname-util.c b/src/libbasic/hostname-util.c
new file mode 100644
index 0000000000..7bb23448ed
--- /dev/null
+++ b/src/libbasic/hostname-util.c
@@ -0,0 +1,224 @@
+/***
+  This file is part of systemd.
+
+  Copyright 2015 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 <bits/local_lim.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/utsname.h>
+#include <unistd.h>
+
+#include "fd-util.h"
+#include "fileio.h"
+#include "hostname-util.h"
+#include "macro.h"
+#include "string-util.h"
+
+bool hostname_is_set(void) {
+        struct utsname u;
+
+        assert_se(uname(&u) >= 0);
+
+        if (isempty(u.nodename))
+                return false;
+
+        /* This is the built-in kernel default host name */
+        if (streq(u.nodename, "(none)"))
+                return false;
+
+        return true;
+}
+
+char* gethostname_malloc(void) {
+        struct utsname u;
+
+        assert_se(uname(&u) >= 0);
+
+        if (isempty(u.nodename) || streq(u.nodename, "(none)"))
+                return strdup(u.sysname);
+
+        return strdup(u.nodename);
+}
+
+static bool hostname_valid_char(char c) {
+        return
+                (c >= 'a' && c <= 'z') ||
+                (c >= 'A' && c <= 'Z') ||
+                (c >= '0' && c <= '9') ||
+                c == '-' ||
+                c == '_' ||
+                c == '.';
+}
+
+/**
+ * Check if s looks like a valid host name or FQDN. This does not do
+ * full DNS validation, but only checks if the name is composed of
+ * allowed characters and the length is not above the maximum allowed
+ * by Linux (c.f. dns_name_is_valid()). Trailing dot is allowed if
+ * allow_trailing_dot is true and at least two components are present
+ * in the name. Note that due to the restricted charset and length
+ * this call is substantially more conservative than
+ * dns_name_is_valid().
+ */
+bool hostname_is_valid(const char *s, bool allow_trailing_dot) {
+        unsigned n_dots = 0;
+        const char *p;
+        bool dot;
+
+        if (isempty(s))
+                return false;
+
+        /* Doesn't accept empty hostnames, hostnames with
+         * leading dots, and hostnames with multiple dots in a
+         * sequence. Also ensures that the length stays below
+         * HOST_NAME_MAX. */
+
+        for (p = s, dot = true; *p; p++) {
+                if (*p == '.') {
+                        if (dot)
+                                return false;
+
+                        dot = true;
+                        n_dots ++;
+                } else {
+                        if (!hostname_valid_char(*p))
+                                return false;
+
+                        dot = false;
+                }
+        }
+
+        if (dot && (n_dots < 2 || !allow_trailing_dot))
+                return false;
+
+        if (p-s > HOST_NAME_MAX) /* Note that HOST_NAME_MAX is 64 on
+                                  * Linux, but DNS allows domain names
+                                  * up to 255 characters */
+                return false;
+
+        return true;
+}
+
+char* hostname_cleanup(char *s) {
+        char *p, *d;
+        bool dot;
+
+        assert(s);
+
+        for (p = s, d = s, dot = true; *p; p++) {
+                if (*p == '.') {
+                        if (dot)
+                                continue;
+
+                        *(d++) = '.';
+                        dot = true;
+                } else if (hostname_valid_char(*p)) {
+                        *(d++) = *p;
+                        dot = false;
+                }
+
+        }
+
+        if (dot && d > s)
+                d[-1] = 0;
+        else
+                *d = 0;
+
+        strshorten(s, HOST_NAME_MAX);
+
+        return s;
+}
+
+bool is_localhost(const char *hostname) {
+        assert(hostname);
+
+        /* This tries to identify local host and domain names
+         * described in RFC6761 plus the redhatism of .localdomain */
+
+        return strcaseeq(hostname, "localhost") ||
+               strcaseeq(hostname, "localhost.") ||
+               strcaseeq(hostname, "localdomain.") ||
+               strcaseeq(hostname, "localdomain") ||
+               endswith_no_case(hostname, ".localhost") ||
+               endswith_no_case(hostname, ".localhost.") ||
+               endswith_no_case(hostname, ".localdomain") ||
+               endswith_no_case(hostname, ".localdomain.");
+}
+
+bool is_gateway_hostname(const char *hostname) {
+        assert(hostname);
+
+        /* This tries to identify the valid syntaxes for the our
+         * synthetic "gateway" host. */
+
+        return
+                strcaseeq(hostname, "gateway") ||
+                strcaseeq(hostname, "gateway.");
+}
+
+int sethostname_idempotent(const char *s) {
+        char buf[HOST_NAME_MAX + 1] = {};
+
+        assert(s);
+
+        if (gethostname(buf, sizeof(buf)) < 0)
+                return -errno;
+
+        if (streq(buf, s))
+                return 0;
+
+        if (sethostname(s, strlen(s)) < 0)
+                return -errno;
+
+        return 1;
+}
+
+int read_hostname_config(const char *path, char **hostname) {
+        _cleanup_fclose_ FILE *f = NULL;
+        char l[LINE_MAX];
+        char *name = NULL;
+
+        assert(path);
+        assert(hostname);
+
+        f = fopen(path, "re");
+        if (!f)
+                return -errno;
+
+        /* may have comments, ignore them */
+        FOREACH_LINE(l, f, return -errno) {
+                truncate_nl(l);
+                if (l[0] != '\0' && l[0] != '#') {
+                        /* found line with value */
+                        name = hostname_cleanup(l);
+                        name = strdup(name);
+                        if (!name)
+                                return -ENOMEM;
+                        break;
+                }
+        }
+
+        if (!name)
+                /* no non-empty line found */
+                return -ENOENT;
+
+        *hostname = name;
+        return 0;
+}