logger: support printk() style priority prefixes

4 files changed, 45 insertions, 10 deletions

diff --git a/execute.c b/execute.c
index a36e52b345..12f514504c 100644
--- a/execute.c
+++ b/execute.c
@@ -187,10 +187,12 @@ static int connect_logger_as(const ExecContext *context, ExecOutput output, cons
         dprintf(fd,
                 "%s\n"
                 "%i\n"
-                "%s\n",
+                "%s\n"
+                "%i\n",
                 output == EXEC_OUTPUT_KERNEL ? "kmsg" : "syslog",
                 context->syslog_priority,
-                context->syslog_identifier ? context->syslog_identifier : ident);
+                context->syslog_identifier ? context->syslog_identifier : ident,
+                !context->syslog_no_prefix);
 
         if (fd != nfd) {
                 r = dup2(fd, nfd) < 0 ? -errno : nfd;
diff --git a/execute.h b/execute.h
index 5c2d15787e..be73542d4b 100644
--- a/execute.h
+++ b/execute.h
@@ -98,6 +98,7 @@ struct ExecContext {
 
         int syslog_priority;
         char *syslog_identifier;
+        bool syslog_no_prefix;
 
         char *tty_path;
 
diff --git a/load-fragment.c b/load-fragment.c
index deebba3e82..148a579d99 100644
--- a/load-fragment.c
+++ b/load-fragment.c
@@ -1198,6 +1198,7 @@ static int load_from_path(Unit *u, const char *path) {
                 { "SyslogIdentifier",       config_parse_string,          &(context).syslog_identifier,                    section   }, \
                 { "SyslogFacility",         config_parse_facility,        &(context).syslog_priority,                      section   }, \
                 { "SyslogLevel",            config_parse_level,           &(context).syslog_priority,                      section   }, \
+                { "SyslogNoPrefix",         config_parse_bool,            &(context).syslog_no_prefix,                     section   }, \
                 { "Capabilities",           config_parse_capabilities,    &(context),                                      section   }, \
                 { "SecureBits",             config_parse_secure_bits,     &(context),                                      section   }, \
                 { "CapabilityBoundingSetDrop", config_parse_bounding_set, &(context),                                      section   }, \
diff --git a/logger.c b/logger.c
index b7c8ab8507..f81d2c5c8a 100644
--- a/logger.c
+++ b/logger.c
@@ -55,10 +55,16 @@ typedef struct Server {
         unsigned n_streams;
 } Server;
 
+typedef enum StreamTarget {
+        STREAM_SYSLOG,
+        STREAM_KMSG
+} StreamTarget;
+
 typedef enum StreamState {
-        STREAM_LOG_TARGET,
+        STREAM_TARGET,
         STREAM_PRIORITY,
         STREAM_PROCESS,
+        STREAM_PREFIX,
         STREAM_RUNNING
 } StreamState;
 
@@ -75,6 +81,8 @@ struct Stream {
         pid_t pid;
         uid_t uid;
 
+        bool prefix;
+
         char buffer[STREAM_BUFFER];
         size_t length;
 
@@ -85,10 +93,24 @@ static int stream_log(Stream *s, char *p, usec_t timestamp) {
 
         char header_priority[16], header_time[64], header_pid[16];
         struct iovec iovec[5];
+        int priority;
 
         assert(s);
         assert(p);
 
+        priority = s->priority;
+
+        if (s->prefix &&
+            p[0] == '<' &&
+            p[1] >= '0' && p[1] <= '7' &&
+            p[2] == '>') {
+
+                /* Detected priority prefix */
+                priority = LOG_MAKEPRI(LOG_FAC(priority), (p[1] - '0'));
+
+                p += 3;
+        }
+
         if (*p == 0)
                 return 0;
 
@@ -105,10 +127,10 @@ static int stream_log(Stream *s, char *p, usec_t timestamp) {
          */
 
         snprintf(header_priority, sizeof(header_priority), "<%i>",
-                 s->target == LOG_TARGET_SYSLOG ? s->priority : LOG_PRI(s->priority));
+                 s->target == STREAM_SYSLOG ? priority : LOG_PRI(priority));
         char_array_0(header_priority);
 
-        if (s->target == LOG_TARGET_SYSLOG) {
+        if (s->target == STREAM_SYSLOG) {
                 time_t t;
                 struct tm *tm;
 
@@ -126,7 +148,7 @@ static int stream_log(Stream *s, char *p, usec_t timestamp) {
         zero(iovec);
         IOVEC_SET_STRING(iovec[0], header_priority);
 
-        if (s->target == LOG_TARGET_SYSLOG) {
+        if (s->target == STREAM_SYSLOG) {
                 struct msghdr msghdr;
 
                 IOVEC_SET_STRING(iovec[1], header_time);
@@ -141,7 +163,7 @@ static int stream_log(Stream *s, char *p, usec_t timestamp) {
                 if (sendmsg(s->server->syslog_fd, &msghdr, MSG_NOSIGNAL) < 0)
                         return -errno;
 
-        } else if (s->target == LOG_TARGET_KMSG) {
+        } else if (s->target == STREAM_KMSG) {
                 IOVEC_SET_STRING(iovec[1], s->process);
                 IOVEC_SET_STRING(iovec[2], header_pid);
                 IOVEC_SET_STRING(iovec[3], p);
@@ -165,13 +187,13 @@ static int stream_line(Stream *s, char *p, usec_t timestamp) {
 
         switch (s->state) {
 
-        case STREAM_LOG_TARGET:
+        case STREAM_TARGET:
                 if (streq(p, "syslog"))
-                        s->target = LOG_TARGET_SYSLOG;
+                        s->target = STREAM_SYSLOG;
                 else if (streq(p, "kmsg")) {
 
                         if (s->server->kmsg_fd >= 0 && s->uid == 0)
-                                s->target = LOG_TARGET_KMSG;
+                                s->target = STREAM_KMSG;
                         else {
                                 log_warning("/dev/kmsg logging not available.");
                                 return -EPERM;
@@ -201,6 +223,15 @@ static int stream_line(Stream *s, char *p, usec_t timestamp) {
                 if (!(s->process = strdup(p)))
                         return -ENOMEM;
 
+                s->state = STREAM_PREFIX;
+                return 0;
+
+        case STREAM_PREFIX:
+
+                if ((r = parse_boolean(p)) < 0)
+                        return r;
+
+                s->prefix = r;
                 s->state = STREAM_RUNNING;
                 return 0;