[libvirt] [PATCH for 5.10.0] nss: Don't fail on empty files

[Michal Privoznik]

Before we rewrote nss plugin so that it doesn't use libvirt's
internal functions it used virLeaseReadCustomLeaseFile() to parse
.status files. After the rewrite it's using read() + yajl_parse()
+ yajl_complete_parse(). There's one catch though,
virLeaseReadCustomLeaseFile() skipped over empty files.

An empty .status file is created when a network is started. This
is because we configure dnsmasq to use our leasehelper. So the
first thing it does it calls it as follows:

  DNSMASQ_INTERFACE=virbr0 /usr/libexec/libvirt_leaseshelper init

which causes the leasehelper to create empty virbr0.status file.
If there is only one libvirt network then that is no problem -
there are no other .status files to parse anyway. But if there
are two or more networks then the first empty .status file causes
whole parsing process and subsequently the whole name lookup
process to fail.

Reported-by: Pavel Hrdina <phrdina at redhat.com>
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 tools/nss/libvirt_nss_leases.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/nss/libvirt_nss_leases.c b/tools/nss/libvirt_nss_leases.c
index e96e260da8..7c431e4d53 100644
--- a/tools/nss/libvirt_nss_leases.c
+++ b/tools/nss/libvirt_nss_leases.c
@@ -379,6 +379,7 @@ findLeases(const char *file,
     };
     yajl_handle parser = NULL;
     char line[1024];
+    ssize_t nreadTotal = 0;
     int rv;
 
     if ((fd = open(file, O_RDONLY)) < 0) {
@@ -398,6 +399,7 @@ findLeases(const char *file,
             goto cleanup;
         if (rv == 0)
             break;
+        nreadTotal += rv;
 
         if (yajl_parse(parser, (const unsigned char *)line, rv)  !=
             yajl_status_ok) {
@@ -409,7 +411,8 @@ findLeases(const char *file,
         }
     }
 
-    if (yajl_complete_parse(parser) != yajl_status_ok) {
+    if (nreadTotal > 0 &&
+        yajl_complete_parse(parser) != yajl_status_ok) {
         ERROR("Parse failed %s",
               yajl_get_error(parser, 1, NULL, 0));
         goto cleanup;
-- 
2.23.0