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ignore CNAMEs in RDNS-mode #1460

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Suppose your provider uses RFC 2317 (or RFC 4183 for that matter). The output of nslookup could look like the following:
2.120.22.172.in-addr.arpa	canonical name = 2.0/26.120.22.172.in-addr.arpa.
2.0/26.120.22.172.in-addr.arpa	name = rajesh.intern.prauscher.de.
Without this filter, check_dns would check the string against "2.0/26.120.22.172.in-addr.arpa., rajesh.intern.prauscher.de." which will fail for obvious reasons.
In forward DNS, this is achieved in line 165, as nslookup will print the address separate from the CNAME-resolving.

Original commit by Patrick Rauscher (prauscher@prauscher.de), adapted
here.
This commit is contained in:
Lorenz Kästle 2025-03-09 15:43:06 +01:00
parent 8a415c3c09
commit 16cb24807d
1 changed files with 3 additions and 0 deletions
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3
plugins/check_dns.c
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@ -128,6 +128,9 @@ int main(int argc, char **argv) {
}
if (strcasestr(chld_out.line[i], ".in-addr.arpa") || strcasestr(chld_out.line[i], ".ip6.arpa")) {
if ((strstr(chld_out.line[i], "canonical name = ") != NULL)) {
continue;
}
char *temp_buffer = NULL;
if ((temp_buffer = strstr(chld_out.line[i], "name = "))) {
addresses[n_addresses++] = strdup(temp_buffer + 7);