[nginx] Syslog: added "nohostname" option.

[Vladimir Homutov]

details:   http://hg.nginx.org/nginx/rev/a6a2016b8e31
branches:  
changeset: 6286:a6a2016b8e31
user:      Vladimir Homutov <vl at nginx.com>
date:      Mon Oct 26 19:06:42 2015 +0300
description:
Syslog: added "nohostname" option.

The option disables sending hostname in the syslog message header.  This is
useful with syslog daemons that do not expect it (tickets #677 and #783).

diffstat:

 src/core/ngx_syslog.c |  8 ++++++++
 src/core/ngx_syslog.h |  3 ++-
 2 files changed, 10 insertions(+), 1 deletions(-)

diffs (38 lines):

diff -r 1f26bf65b1bc -r a6a2016b8e31 src/core/ngx_syslog.c
--- a/src/core/ngx_syslog.c	Tue Oct 27 23:16:35 2015 +0300
+++ b/src/core/ngx_syslog.c	Mon Oct 26 19:06:42 2015 +0300
@@ -194,6 +194,9 @@ ngx_syslog_parse_args(ngx_conf_t *cf, ng
             peer->tag.data = p + 4;
             peer->tag.len = len - 4;
 
+        } else if (len == 10 && ngx_strncmp(p, "nohostname", 10) == 0) {
+            peer->nohostname = 1;
+
         } else {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                                "unknown syslog parameter \"%s\"", p);
@@ -220,6 +223,11 @@ ngx_syslog_add_header(ngx_syslog_peer_t 
 
     pri = peer->facility * 8 + peer->severity;
 
+    if (peer->nohostname) {
+        return ngx_sprintf(buf, "<%ui>%V %V: ", pri, &ngx_cached_syslog_time,
+                           &peer->tag);
+    }
+
     return ngx_sprintf(buf, "<%ui>%V %V %V: ", pri, &ngx_cached_syslog_time,
                        &ngx_cycle->hostname, &peer->tag);
 }
diff -r 1f26bf65b1bc -r a6a2016b8e31 src/core/ngx_syslog.h
--- a/src/core/ngx_syslog.h	Tue Oct 27 23:16:35 2015 +0300
+++ b/src/core/ngx_syslog.h	Mon Oct 26 19:06:42 2015 +0300
@@ -16,7 +16,8 @@ typedef struct {
 
     ngx_addr_t        server;
     ngx_connection_t  conn;
-    ngx_uint_t        busy;  /* unsigned busy:1; */
+    unsigned          busy:1;
+    unsigned          nohostname:1;
 } ngx_syslog_peer_t;