Daan De Meyer
93a1f7921a
Now that the necessary functions from log.h have been moved to macro.h, we can stop including log.h in macro.h. This requires modifying source files all over the tree to include log.h instead.
87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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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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#if HAVE_LIBIDN2
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_cleanup_free_ char *utf8 = NULL;
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#elif HAVE_LIBIDN
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int k;
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#endif
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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_LIBIDN || HAVE_LIBIDN2
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r = dlopen_idn();
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if (r < 0) {
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log_debug_errno(r, "Failed to initialize IDN support, ignoring: %m");
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decoded = label; /* no decoding */
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} else
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#endif
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{
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#if HAVE_LIBIDN2
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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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#elif HAVE_LIBIDN
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k = dns_label_undo_idna(label, r, label, sizeof label);
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if (k < 0)
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return log_debug_errno(k, "Failed to undo IDNA: %m");
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if (k > 0)
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r = k;
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if (!utf8_is_valid(label))
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return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
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"System hostname is not UTF-8 clean.");
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decoded = label;
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#else
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decoded = label; /* no decoding */
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#endif
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}
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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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