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conf: Don't warn if nameservers were found, but won't be advertised

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Starting from commit 3a2afde87d ("conf, udp: Drop mostly duplicated
dns_send arrays, rename related fields"), we won't add to c->ip4.dns
and c->ip6.dns nameservers that can't be used by the guest or
container, and we won't advertise them.

However, the fact that we don't advertise any nameserver doesn't mean
that we didn't find any, and we should warn only if we couldn't find
any.

This is particularly relevant in case both --dns-forward and
--no-map-gw are passed, and a single loopback address is listed in
/etc/resolv.conf: we'll forward queries directed to the address
specified by --dns-forward to the loopback address we found, we
won't advertise that address, so we shouldn't warn: this is a
perfectly legitimate usage.

Reported-by: Paul Holzinger <pholzing@redhat.com>
Link: https://github.com/containers/podman/issues/19213
Fixes: 3a2afde87d ("conf, udp: Drop mostly duplicated dns_send arrays, rename related fields")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Tested-by: Paul Holzinger <pholzing@redhat.com>
This commit is contained in:
Stefano Brivio 2024-03-08 00:12:19 +01:00
parent 4779dfe12f
commit 860d2764dd
1 changed files with 8 additions and 3 deletions
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11
conf.c
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@ -399,6 +399,7 @@ static void get_dns(struct ctx *c)
int dns4_set, dns6_set, dnss_set, dns_set, fd;
struct fqdn *s = c->dns_search;
struct lineread resolvconf;
unsigned int added = 0;
char *line, *end;
const char *p;
int line_len;
@ -427,13 +428,17 @@ static void get_dns(struct ctx *c)
if (!dns4_set &&
dns4 - &c->ip4.dns[0] < ARRAY_SIZE(c->ip4.dns) - 1
&& inet_pton(AF_INET, p + 1, &dns4_tmp))
&& inet_pton(AF_INET, p + 1, &dns4_tmp)) {
add_dns4(c, &dns4_tmp, &dns4);
added++;
}
if (!dns6_set &&
dns6 - &c->ip6.dns[0] < ARRAY_SIZE(c->ip6.dns) - 1
&& inet_pton(AF_INET6, p + 1, &dns6_tmp))
&& inet_pton(AF_INET6, p + 1, &dns6_tmp)) {
add_dns6(c, &dns6_tmp, &dns6);
added++;
}
} else if (!dnss_set && strstr(line, "search ") == line &&
s == c->dns_search) {
end = strpbrk(line, "\n");
@ -459,7 +464,7 @@ static void get_dns(struct ctx *c)
close(fd);
out:
if (!dns_set && dns4 == c->ip4.dns && dns6 == c->ip6.dns)
if (!dns_set && !added)
warn("Couldn't get any nameserver address");
}