Control: tags -1 moreinfo
On Fri, 26 Feb 2021 21:41:17 +0100 Axel Scheepers
<axel.scheeper...@gmail.com> wrote:
> Package: iproute2
> Version: 5.10.0-4
> Severity: normal
> Tags: ipv6
>
> Dear Maintainer,
>
> * What led up to the situation?
>
> Using ip -6 -r route shows (on 10.8) either an information leak:
> $ ip -6 -r r
> +U dev lo proto kernel metric 256 pref medium
>
> or (on testing) empty output:
>
> $ ip -6 -r r
> dev lo proto kernel metric 256 pref medium
>
> for the resolved hostname.
>
> * What outcome did you expect instead?
>
> Printing of the resolved name, e.g. 'localhost' for dev lo.
>
> Reading the source and a bit of printf debugging i can see it's
> in lib/utils.c, format_host_r:
>
> 1113z20n
> 1113 const char *format_host_r(int af, int len, const void *addr,
> 1114 char *buf, int buflen)
> 1115 {
> 1116 #ifdef RESOLVE_HOSTNAMES
> 1117 if (resolve_hosts) {
> 1118 const char *n;
> 1119
> 1120 puts("XXX: here");
> 1121 len = len <= 0 ? af_byte_len(af) : len;
> 1122
> 1123 if (len > 0 &&
> 1124 (n = resolve_address(addr, len, af)) !=
> NULL)
> 1125 {
> 1126 printf("n is '%s'\n", n);
> 1127 strncpy(buf, n, buflen);
> 1128 return n;
> 1129 }
> 1130 }
> 1131 #endif
>
>
> results in:
> ./ip/ip -6 -r r
> XXX: here
> n is 'localhost'
> localhost dev lo proto kernel metric 256 pref medium
>
>
> Something better then this awful hack should be implemented i guess.
>
> Kind regards,This is fixed for me with 5.13, which is now in testing - can you confirm? $ ip -6 -r r localhost dev lo proto kernel metric 256 pref medium $ ip -V ip utility, iproute2-5.13.0, libbpf 0.4.0 -- Kind regards, Luca Boccassi
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