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authorRich Felker <dalias@aerifal.cx>2022-09-19 15:51:04 -0400
committerRich Felker <dalias@aerifal.cx>2022-09-19 15:51:04 -0400
commit1e7fb12f775a3e599be08da9835422d96c56f479 (patch)
tree4ab7c80ac81d06682fabe8a58d8673ffbc665542
parent001c1afb0a08912a6fdc7c462c53e221de4bc9f1 (diff)
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dns: treat names rejected by res_mkquery as nonexistent rather than error
this distinction only affects search, but allows search to continue when concatenating one of the search domains onto the requested name produces a result that's not valid. this can happen when the concatenation is too long, or one of the search list entries is itself not valid. as a consequence of this change, having "." in the search domains list will now be ignored/skipped rather than making the lookup abort with no results (due to producing a concatenation ending in ".."). this behavior could be changed later if needed.
-rw-r--r--src/network/lookup_name.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/network/lookup_name.c b/src/network/lookup_name.c
index b5232ce8..bec6ba22 100644
--- a/src/network/lookup_name.c
+++ b/src/network/lookup_name.c
@@ -153,7 +153,7 @@ static int name_from_dns(struct address buf[static MAXADDRS], char canon[static
qlens[nq] = __res_mkquery(0, name, 1, afrr[i].rr,
0, 0, 0, qbuf[nq], sizeof *qbuf);
if (qlens[nq] == -1)
- return EAI_NONAME;
+ return 0;
qbuf[nq][3] = 0; /* don't need AD flag */
/* Ensure query IDs are distinct. */
if (nq && qbuf[nq][0] == qbuf[0][0])