BE: Log domain name to journald if available

If the SSSD is compiled with journald support, then all sss_log()
statements will include a new field called "SSSD_DOMAIN" that includes
the domain name. Filtering only messages from the single domain is then
as easy as:
 # journalctl SSSD_DOMAIN=foo.example.com

4 files changed, 16 insertions, 0 deletions

diff --git a/src/providers/data_provider_be.c b/src/providers/data_provider_be.c
index 912b4191..ccd51b45 100644
--- a/src/providers/data_provider_be.c
+++ b/src/providers/data_provider_be.c
@@ -2891,6 +2891,8 @@ int main(int argc, const char *argv[])
         return 2;
     }
 
+    setenv(SSS_DOM_ENV, be_domain, 1);
+
     ret = die_if_parent_died();
     if (ret != EOK) {
         /* This is not fatal, don't return */
diff --git a/src/util/server.c b/src/util/server.c
index a33207b3..3dcfccaf 100644
--- a/src/util/server.c
+++ b/src/util/server.c
@@ -423,6 +423,11 @@ int server_setup(const char *name, int flags,
 
     setenv("_SSS_LOOPS", "NO", 0);
 
+    /* To make sure the domain cannot be set from the environment, unset the
+     * variable explicitly when setting up any server. Backends later set the
+     * value after reading domain from the configuration */
+    unsetenv(SSS_DOM_ENV);
+
     setup_signals();
 
     /* we want default permissions on created files to be very strict,
diff --git a/src/util/sss_log.c b/src/util/sss_log.c
index 6b78c9d4..5be9e7f2 100644
--- a/src/util/sss_log.c
+++ b/src/util/sss_log.c
@@ -65,6 +65,7 @@ void sss_log(int priority, const char *format, ...)
     int syslog_priority;
     int ret;
     char *message;
+    const char *domain;
 
     va_start(ap, format);
     ret = vasprintf(&message, format, ap);
@@ -75,8 +76,14 @@ void sss_log(int priority, const char *format, ...)
         return;
     }
 
+    domain = getenv(SSS_DOM_ENV);
+    if (domain == NULL) {
+        domain = "";
+    }
+
     syslog_priority = sss_to_syslog(priority);
     sd_journal_send("MESSAGE=%s", message,
+                    "SSSD_DOMAIN=%s", domain,
                     "PRIORITY=%i", syslog_priority,
                     "SYSLOG_FACILITY=%i", LOG_FAC(LOG_DAEMON),
                     "SYSLOG_IDENTIFIER=%s", debug_prg_name,
diff --git a/src/util/util.h b/src/util/util.h
index 18ec4176..20d230c1 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -72,6 +72,8 @@ int debug_get_level(int old_level);
 int debug_convert_old_level(int old_level);
 errno_t set_debug_file_from_fd(const int fd);
 
+#define SSS_DOM_ENV           "_SSS_DOM"
+
 #define SSSDBG_FATAL_FAILURE  0x0010   /* level 0 */
 #define SSSDBG_CRIT_FAILURE   0x0020   /* level 1 */
 #define SSSDBG_OP_FAILURE     0x0040   /* level 2 */