Yu Watanabe
661ab8b6fd
Since 4c0d8d9673, most dlopen notes are
set at the beginning of the executables. Let's manage all dlopen notes
there, rather than setting them where dlopen is called.
Note that the only exceptions are the LIBBPF_NOTE for networkd and
nsresource. Since dlopen_bpf() is wrapped in an `#if` guard, the notes
are instead set within the corresponding functionality.
As a result, the DLOPEN_FOO() wrapper macros are no longer needed and
can be dropped completely.
66 lines
2.2 KiB
C
66 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "alloc-util.h"
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#include "dns-def.h"
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#include "dns-domain.h"
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#include "hostname-setup.h"
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#include "hostname-util.h"
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#include "idn-util.h"
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#include "log.h"
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#include "resolved-util.h"
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#include "utf8.h"
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int resolve_system_hostname(char **full_hostname, char **first_label) {
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_cleanup_free_ char *h = NULL, *n = NULL;
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char label[DNS_LABEL_MAX+1];
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const char *p, *decoded;
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int r;
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/* Return the full hostname in *full_hostname, if nonnull.
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*
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* Extract and normalize the first label of the locally configured hostname, check it's not
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* "localhost", and return it in *first_label, if nonnull. */
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r = gethostname_strict(&h);
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if (r < 0)
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return log_debug_errno(r, "Can't determine system hostname: %m");
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p = h;
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r = dns_label_unescape(&p, label, sizeof label, 0);
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if (r < 0)
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return log_debug_errno(r, "Failed to unescape hostname: %m");
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if (r == 0)
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
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"Couldn't find a single label in hostname.");
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#if HAVE_LIBIDN2
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_cleanup_free_ char *utf8 = NULL;
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if (dlopen_idn(LOG_DEBUG) >= 0) {
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r = sym_idn2_to_unicode_8z8z(label, &utf8, 0);
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if (r != IDN2_OK)
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return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN),
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"Failed to undo IDNA: %s", sym_idn2_strerror(r));
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assert(utf8_is_valid(utf8));
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r = strlen(utf8);
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decoded = utf8;
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} else
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#endif
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decoded = label; /* no decoding */
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r = dns_label_escape_new(decoded, r, &n);
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if (r < 0)
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return log_debug_errno(r, "Failed to escape hostname: %m");
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if (is_localhost(n))
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
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"System hostname is 'localhost', ignoring.");
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if (full_hostname)
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*full_hostname = TAKE_PTR(h);
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if (first_label)
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*first_label = TAKE_PTR(n);
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return 0;
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}
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