From 1438a5288e1e3392c654bbe55f0cf4b65ef603b4 Mon Sep 17 00:00:00 2001
From: Jonas Suhr Christensen <jsc@umbraculum.org>
Date: Wed, 12 Dec 2012 13:40:02 +0100
Subject: Ready for use. If you run Linux.

---
 debug_syslog.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 110 insertions(+), 3 deletions(-)

diff --git a/debug_syslog.c b/debug_syslog.c
index fb7ab2f..c5d9dbc 100644
--- a/debug_syslog.c
+++ b/debug_syslog.c
@@ -46,9 +46,12 @@
 #define SYSLOG_CONTENTLEN SYSLOG_MSGLEN - SYSLOG_PRILEN - SYSLOG_TIMELEN - SYSLOG_TAGLEN
 //#define SYSLOG_CONTENTLEN SYSLOG_MSGLEN - SYSLOG_PRILEN - SYSLOG_TAGLEN - SYSLOG_HEADERLEN -1
 
+#define SYSLOG_LENOFEXECNAME 256
 
 static int dbg_syslog_sock;
 static struct sockaddr_in dbg_syslog_sockaddr;
+static pid_t pid;
+static char execname[SYSLOG_LENOFEXECNAME];
 
 void dbg_syslog_init(const char* host, int port) 
 {
@@ -61,8 +64,32 @@ void dbg_syslog_init(const char* host, int port)
   dbg_syslog_sockaddr.sin_family = AF_INET;
   dbg_syslog_sockaddr.sin_addr.s_addr = inet_addr(host);
   dbg_syslog_sockaddr.sin_port = htons(port);
+
+  // This implementation has all kind of possible errors:
+  //   * It is Linux only
+  //   * Max length of execname (including path, avoid this by cmdline file in reverse order) 
+  //     is set to SYSLOG_LENOFEXECNAME
+  //   * If not found execname is ""
+  pid = getpid();
+  char buf[SYSLOG_LENOFEXECNAME];
+  FILE* f = fopen("/proc/self/cmdline", "r");
+  if(f) {
+    fgets(buf, SYSLOG_LENOFEXECNAME, f);
+    fclose(f);
+  }
+  
+  char* bufptr = strrchr(buf, '/');
+  if(bufptr) {
+    strncpy(execname, bufptr+1, SYSLOG_LENOFEXECNAME-1);
+  }
+  else {
+    strcpy(execname, "\0");
+  }
+
+  printf("\tRunning as %s with pid %d\n", execname, pid);
 }
 
+/*
 void dbg_syslog_createheader() {
   const time_t rawtime = time(NULL);
   struct tm time;
@@ -73,6 +100,83 @@ void dbg_syslog_createheader() {
   char bufpri[SYSLOG_PRILEN] = "<20>";
   char buftag[SYSLOG_TAGLEN] = "PROGRAM[PID]: ";
 
+}
+*/
+
+/*
+ * Syslog message specification (based on rfc3164). 
+ * Modified after reading syslog v2. documentation
+ *
+ * MSG: "<%d%d>%s %s %s%c%s", FACILITY, SEVERITY, TIME, CLIENT, TAG, DELIM, CONTENT
+ * 
+ * Example:
+ *   <34>Oct 11 22:14:15 mymachine su: 'su root' failed for lonvick on /dev/pts/8
+ *
+ *
+ * NOTE! Length of MSG must not exceed 1024 characters!
+ *
+ * FACILITY:
+ *      0             kernel messages
+ *      1             user-level messages
+ *      2             mail system
+ *      3             system daemons
+ *      4             security/authorization messages (note 1)
+ *      5             messages generated internally by syslogd
+ *      6             line printer subsystem
+ *      7             network news subsystem
+ *      8             UUCP subsystem
+ *      9             clock daemon (note 2)
+ *      10            security/authorization messages (note 1)
+ *      11            FTP daemon
+ *      12            NTP subsystem
+ *      13            log audit (note 1)
+ *      14            log alert (note 1)
+ *      15            clock daemon (note 2)
+ *      16            local use 0  (local0)
+ *      17            local use 1  (local1)
+ *      18            local use 2  (local2)
+ *      19            local use 3  (local3)
+ *      20            local use 4  (local4)
+ *      21            local use 5  (local5)
+ *      22            local use 6  (local6)
+ *      23            local use 7  (local7)
+ *
+ * SEVERITY:
+ *      0       Emergency: system is unusable
+ *      1       Alert: action must be taken immediately
+ *      2       Critical: critical conditions
+ *      3       Error: error conditions
+ *      4       Warning: warning conditions
+ *      5       Notice: normal but significant condition
+ *      6       Informational: informational messages
+ *      7       Debug: debug-level messages
+ *
+ * TIME:
+ *     Time of message formatted like: Mmm dd hh:mm:ss
+ *
+ * CLIENT:
+ *     Hostname or
+ *     IPv4 address or
+ *     IPv6 address
+ *
+ * TAG: format: PROGRAM[PID]
+ *     Program or process information
+ *     PROGRAM is Alphanumeric 
+ *     PID is numeric 
+ *     Must not exceed 32 characters
+ * 
+ * DELIM:
+ *     A nonn-alphanumeric character (eg. ':', '[' ...)
+ *     In implementation DELIM is the first character of CONTENT
+ *
+ * CONTENT:
+ *     The message to log.
+ *     String of printable characters
+ *
+ * */
+
+static void _calculate_pri() {
+
 }
 
 void dbg_syslog_output(char* msg) 
@@ -85,8 +189,11 @@ void dbg_syslog_output(char* msg)
   char buftime[SYSLOG_TIMELEN];
   strftime(buftime, SYSLOG_TIMELEN, "%b %e %H:%M:%S ", &time);
 
-  char bufpri[SYSLOG_PRILEN] = "<20>";
-  char buftag[SYSLOG_TAGLEN] = "PROGRAM[PID]: ";
+  // Currently everything is mapped to local facility 4 as debug
+  char bufpri[SYSLOG_PRILEN] = "<167>";
+
+  char buftag[SYSLOG_TAGLEN];
+  snprintf(buftag, SYSLOG_TAGLEN, "%s[%d]: ", execname, pid);
 
   char buf[SYSLOG_MSGLEN];
   memset(buf, 0, sizeof(buf));
@@ -97,7 +204,7 @@ void dbg_syslog_output(char* msg)
   strcat(buf, "\n");
 
 
-  printf("Sending to syslog: %s\n", buf);
+//  printf("Sending to syslog: %s\n", buf);
   int buf_len = strlen(buf);
   if((sendto(dbg_syslog_sock, buf, buf_len, 0, (struct sockaddr *) &dbg_syslog_sockaddr, 
              sizeof(dbg_syslog_sockaddr))) != buf_len) {
-- 
cgit v1.2.3