Configurable syslog name.

Also fixes a bug in syslog initialization.

conf/conf.h

@@ -21,6 +21,7 @@ struct config {
   list tables;				/* Configured routing tables (struct rtable_config) */
   list logfiles;			/* Configured log fils (sysdep) */
   int mrtdump_file;			/* Configured MRTDump file (sysdep, fd in unix) */
+  char *syslog_name;			/* Name used for syslog (NULL -> no syslog) */
   struct rtable_config *master_rtc;	/* Configuration of master routing table */
 
   u32 router_id;			/* Our Router ID */

doc/bird.sgml

@@ -219,9 +219,10 @@ protocol rip {
 <sect>Global options
 
 <p><descrip>
-	<tag>log "<m/filename/"|syslog|stderr all|{ <m/list of classes/ }</tag> 
+	<tag>log "<m/filename/"|syslog [name <m/name/]|stderr all|{ <m/list of classes/ }</tag> 
 	Set logging of messages having the given class (either <cf/all/ or <cf/{
-	error, trace }/ etc.) into selected destination. Classes are:
+	error, trace }/ etc.) into selected destination (a file specified as a filename string,
+	syslog with optional name argument, or the stderr output). Classes are:
 	<cf/info/, <cf/warning/, <cf/error/ and <cf/fatal/ for messages about local problems,
 	<cf/debug/ for debugging messages, 
 	<cf/trace/ when you want to know what happens in the network, 

sysdep/unix/config.Y

@@ -14,12 +14,13 @@ CF_HDR
 CF_DECLS
 
 CF_KEYWORDS(LOG, SYSLOG, ALL, DEBUG, TRACE, INFO, REMOTE, WARNING, ERROR, AUTH, FATAL, BUG, STDERR, SOFT)
-CF_KEYWORDS(TIMEFORMAT, ISO, SHORT, LONG, BASE)
+CF_KEYWORDS(TIMEFORMAT, ISO, SHORT, LONG, BASE, NAME)
 
 %type <i> log_mask log_mask_list log_cat
 %type <g> log_file
 %type <t> cfg_name
 %type <tf> timeformat_which
+%type <t> syslog_name
 
 CF_GRAMMAR
 
@@ -33,13 +34,18 @@ log_config: LOG log_file log_mask ';' {
   }
  ;
 
+syslog_name:
+   NAME TEXT { $$ = $2; }
+ | { $$ = bird_name; }
+ ;
+
 log_file:
    TEXT {
      FILE *f = tracked_fopen(new_config->pool, $1, "a");
      if (!f) cf_error("Unable to open log file `%s': %m", $1);
      $$ = f;
    }
- | SYSLOG { $$ = NULL; }
+ | SYSLOG syslog_name { $$ = NULL; new_config->syslog_name = $2; }
  | STDERR { $$ = stderr; }
  ;
 

sysdep/unix/log.c

@@ -28,9 +28,9 @@
 #include "lib/lists.h"
 #include "lib/unix.h"
 
-static FILE *dbgf = NULL;
+static FILE *dbgf;
 static list *current_log_list;
-static list init_log_list;
+static char *current_syslog_name; /* NULL -> syslog closed */
 
 bird_clock_t rate_limit_time = 5;
 int rate_limit_count = 5;
@@ -209,38 +209,55 @@ debug(char *msg, ...)
   va_end(args);
 }
 
-void
-log_init(int debug, int init)
+static list *
+default_log_list(int debug, int init, char **syslog_name)
 {
-  static struct log_config lc_stderr = { mask: ~0, terminal_flag: 1 };
-
+  static list init_log_list;
   init_list(&init_log_list);
-  current_log_list = &init_log_list;
+  *syslog_name = NULL;
 
 #ifdef HAVE_SYSLOG
   if (!debug)
     {
       static struct log_config lc_syslog = { mask: ~0 };
-      openlog("bird", LOG_CONS | LOG_NDELAY, LOG_DAEMON);
-      add_tail(current_log_list, &lc_syslog.n);
+      add_tail(&init_log_list, &lc_syslog.n);
+      *syslog_name = bird_name;
       if (!init)
-	return;
+	return &init_log_list;
     }
 #endif
 
+  static struct log_config lc_stderr = { mask: ~0, terminal_flag: 1 };
   lc_stderr.fh = stderr;
-  add_tail(current_log_list, &lc_stderr.n);
+  add_tail(&init_log_list, &lc_stderr.n);
+  return &init_log_list;
 }
 
 void
-log_switch(int debug, list *l)
+log_switch(int debug, list *l, char *new_syslog_name)
 {
-  if (EMPTY_LIST(*l))
-    log_init(debug, 0);
-  else
-    current_log_list = l;
+  if (!l || EMPTY_LIST(*l))
+    l = default_log_list(debug, !l, &new_syslog_name);
+
+  current_log_list = l;
+
+#ifdef HAVE_SYSLOG
+  if (current_syslog_name && new_syslog_name &&
+      !strcmp(current_syslog_name, new_syslog_name))
+    return;
+
+  if (current_syslog_name)
+    closelog();
+
+  if (new_syslog_name)
+    openlog(new_syslog_name, LOG_CONS | LOG_NDELAY, LOG_DAEMON);
+
+  current_syslog_name = new_syslog_name;
+#endif
 }
 
+
+
 void
 log_init_debug(char *f)
 {

sysdep/unix/main.c

@@ -83,7 +83,7 @@ sysdep_preconfig(struct config *c)
 int
 sysdep_commit(struct config *new, struct config *old UNUSED)
 {
-  log_switch(debug_flag, &new->logfiles);
+  log_switch(debug_flag, &new->logfiles, new->syslog_name);
   return 0;
 }
 
@@ -378,21 +378,36 @@ signal_init(void)
  */
 
 static char *opt_list = "c:dD:ps:";
+static int parse_and_exit;
+char *bird_name;
 
 static void
 usage(void)
 {
-  fprintf(stderr, "Usage: bird [-c <config-file>] [-d] [-D <debug-file>] [-p] [-s <control-socket>]\n");
+  fprintf(stderr, "Usage: %s [-c <config-file>] [-d] [-D <debug-file>] [-p] [-s <control-socket>]\n", bird_name);
   exit(1);
 }
 
-int parse_and_exit;
+static inline char *
+get_bird_name(char *s, char *def)
+{
+  char *t;
+  if (!s)
+    return def;
+  t = strrchr(s, '/');
+  if (!t)
+    return s;
+  if (!t[1])
+    return def;
+  return t+1;
+}
 
 static void
 parse_args(int argc, char **argv)
 {
   int c;
 
+  bird_name = get_bird_name(argv[0], "bird");
   if (argc == 2)
     {
       if (!strcmp(argv[1], "--version"))
@@ -444,7 +459,7 @@ main(int argc, char **argv)
   parse_args(argc, argv);
   if (debug_flag == 1)
     log_init_debug("");
-  log_init(debug_flag, 1);
+  log_switch(debug_flag, NULL, NULL);
 
   if (!parse_and_exit)
     test_old_bird(path_control_socket);

sysdep/unix/unix.h

@@ -15,6 +15,7 @@ struct pool;
 
 /* main.c */
 
+extern char *bird_name;
 void async_config(void);
 void async_dump(void);
 void async_shutdown(void);
@@ -60,9 +61,8 @@ void krt_io_init(void);
 
 /* log.c */
 
-void log_init(int debug, int init);
 void log_init_debug(char *);		/* Initialize debug dump to given file (NULL=stderr, ""=off) */
-void log_switch(int debug, struct list *);
+void log_switch(int debug, list *l, char *); /* Use l=NULL for initial switch */
 
 struct log_config {
   node n;