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resolved: beef up logic to detect our own configuration files

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Let's also check for the static resolv.conf, so that we filter all three
of our own files out.
This commit is contained in:
Lennart Poettering 2017-12-08 17:01:47 +01:00
parent a50d79103f
commit b6de578d73
1 changed files with 19 additions and 11 deletions
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30
src/resolve/resolved-resolv-conf.c
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@ -32,25 +32,33 @@
#include "string-util.h"
#include "strv.h"
/* A resolv.conf file containing the DNS server and domain data we learnt from uplink, i.e. the full uplink data */
#define PRIVATE_UPLINK_RESOLV_CONF "/run/systemd/resolve/resolv.conf"
/* A resolv.conf file containing the domain data we learnt from uplink, but our own DNS server address. */
#define PRIVATE_STUB_RESOLV_CONF "/run/systemd/resolve/stub-resolv.conf"
/* A static resolv.conf file containing no domains, but only our own DNS sever address */
#define PRIVATE_STATIC_RESOLV_CONF ROOTLIBEXECDIR "/resolv.conf"
static bool file_is_our_own(const struct stat *st) {
struct stat own1, own2;
const char *path;
assert(st);
/* Is it symlinked to our own file? */
if (stat(PRIVATE_UPLINK_RESOLV_CONF, &own1) >= 0 &&
st->st_dev == own1.st_dev &&
st->st_ino == own1.st_ino)
return true;
FOREACH_STRING(path,
PRIVATE_UPLINK_RESOLV_CONF,
PRIVATE_STUB_RESOLV_CONF,
PRIVATE_STATIC_RESOLV_CONF) {
/* Is it symlinked to our own stub file? */
if (stat(PRIVATE_STUB_RESOLV_CONF, &own2) >= 0 &&
st->st_dev == own2.st_dev &&
st->st_ino == own2.st_ino)
return true;
struct stat own;
/* Is it symlinked to our own uplink file? */
if (stat(path, &own) >= 0 &&
st->st_dev == own.st_dev &&
st->st_ino == own.st_ino)
return true;
}
return false;
}