journal: fix parsing of facility in syslog messages

In 49998b383 (journald: do not overwrite syslog facility when
parsing priority) journald started ignoring facility part when
reading service stderr to convert to syslog messages. In this
case it is fine, because only the priority is allowed.

But the same codepath is used for syslog messages, where the
facility should be used. Split the two codepaths by explicitly
specyfing whether the facility should be ignored or not.

https://bugzilla.redhat.com/show_bug.cgi?id=988814

3 files changed, 10 insertions, 6 deletions

diff --git a/src/journal/journald-stream.c b/src/journal/journald-stream.c
index e98fe94b4..9c4efec9b 100644
--- a/src/journal/journald-stream.c
+++ b/src/journal/journald-stream.c
@@ -90,7 +90,7 @@ static int stdout_stream_log(StdoutStream *s, const char *p) {
         priority = s->priority;
 
         if (s->level_prefix)
-                syslog_parse_priority((char**) &p, &priority);
+                syslog_parse_priority((char**) &p, &priority, false);
 
         if (s->forward_to_syslog || s->server->forward_to_syslog)
                 server_forward_syslog(s->server, syslog_fixup_facility(priority), s->identifier, p, &s->ucred, NULL);
diff --git a/src/journal/journald-syslog.c b/src/journal/journald-syslog.c
index 7cbb34608..c2770a53d 100644
--- a/src/journal/journald-syslog.c
+++ b/src/journal/journald-syslog.c
@@ -236,7 +236,7 @@ size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid)
         return e;
 }
 
-void syslog_parse_priority(char **p, int *priority) {
+void syslog_parse_priority(char **p, int *priority, bool with_facility) {
         int a = 0, b = 0, c = 0;
         int k;
 
@@ -265,10 +265,14 @@ void syslog_parse_priority(char **p, int *priority) {
         } else
                 return;
 
-        if (a < 0 || b < 0 || c < 0)
+        if (a < 0 || b < 0 || c < 0 ||
+            (!with_facility && (a || b || c > 7)))
                 return;
 
-        *priority = (*priority & LOG_FACMASK) | (a*100 + b*10 + c);
+        if (with_facility)
+                *priority = a*100 + b*10 + c;
+        else
+                *priority = (*priority & LOG_FACMASK) | c;
         *p += k;
 }
 
@@ -361,7 +365,7 @@ void server_process_syslog_message(
         assert(buf);
 
         orig = buf;
-        syslog_parse_priority((char**) &buf, &priority);
+        syslog_parse_priority((char**) &buf, &priority, true);
 
         if (s->forward_to_syslog)
                 forward_syslog_raw(s, priority, orig, ucred, tv);
diff --git a/src/journal/journald-syslog.h b/src/journal/journald-syslog.h
index 324b70eef..8ccdb77a0 100644
--- a/src/journal/journald-syslog.h
+++ b/src/journal/journald-syslog.h
@@ -25,7 +25,7 @@
 
 int syslog_fixup_facility(int priority) _const_;
 
-void syslog_parse_priority(char **p, int *priority);
+void syslog_parse_priority(char **p, int *priority, bool with_facility);
 size_t syslog_parse_identifier(const char **buf, char **identifier, char **pid);
 
 void server_forward_syslog(Server *s, int priority, const char *identifier, const char *message, struct ucred *ucred, struct timeval *tv);