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,
Axel Scheepers
-- System Information:
Debian Release: bullseye/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 5.10.0-3-amd64 (SMP w/8 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages iproute2 depends on:
ii debconf [debconf-2.0] 1.5.74
ii libbpf0 1:0.3-2
ii libbsd0 0.11.3-1
ii libc6 2.31-9
ii libcap2 1:2.44-1
ii libcap2-bin 1:2.44-1
ii libdb5.3 5.3.28+dfsg1-0.8
ii libelf1 0.183-1
ii libmnl0 1.0.4-3
ii libselinux1 3.1-3
ii libxtables12 1.8.7-1
Versions of packages iproute2 recommends:
pn libatm1 <none>
Versions of packages iproute2 suggests:
pn iproute2-doc <none>
-- debconf information:
iproute2/setcaps: false
