more work on mysqlmanager

tools/managertest1.nc

+root secret
+def_exec server /usr/sbin/mysqld --socket=/tmp/temp.sock --skip-grant --skip-net --datadir=/tmp
+set_exec_con server root localhost /tmp/temp.sock
+start_exec server 3
+show_exec
+stop_exec server 3
+show_exec
+start_exec server 3
+show_exec
+stop_exec server 3
+show_exec
+shutdown

tools/mysqlmanager.c

@@ -35,23 +35,33 @@
 #include <getopt.h>
 #include <stdarg.h>
 #include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
 #include <unistd.h>
 #include <errno.h>
 #include <violite.h>
 #include <my_pthread.h>
 
 #define MANAGER_VERSION "1.0"
-#define MANAGER_GREETING "MySQL Server Management Daemon v.1.0"
+#define MANAGER_GREETING "MySQL Server Management Daemon v." ## \
+ MANAGER_VERSION
 
 #define LOG_ERR  1
 #define LOG_WARN 2
 #define LOG_INFO 3
 #define LOG_DEBUG 4
 
+#define CHILD_START 1
+#define CHILD_STOP  2
+
 #ifndef MANAGER_PORT
 #define MANAGER_PORT  23546
 #endif
 
+#ifndef MANAGER_CONNECT_RETRIES
+#define MANAGER_CONNECT_RETRIES 5
+#endif
+
 #ifndef MANAGER_MAX_CMD_LEN
 #define MANAGER_MAX_CMD_LEN 16384
 #endif
@@ -68,28 +78,50 @@
 #define MAX_USER_NAME 16
 #endif
 
+#ifndef MANAGER_PW_FILE
+#define MANAGER_PW_FILE "/etc/mysqlmanager.passwd"
+#endif
+
+#ifndef MAX_HOST
+#define MAX_HOST 128
+#endif
+
+#ifndef MAX_LAUNCHER_MSG
+#define MAX_LAUNCHER_MSG 256
+#endif
+
 /* Variable naming convention - if starts with manager_, either is set
    directly by the user, or used closely in ocnjunction with a variable
    set by the user
 */
 
+#if defined(__i386__) && defined(HAVE_LINUXTHREADS)
+#define DO_STACKTRACE 1
+#endif
+
 uint manager_port = MANAGER_PORT;
 FILE* errfp;
 const char* manager_log_file = MANAGER_LOG_FILE;
-pthread_mutex_t lock_log,lock_shutdown,lock_exec_hash;
+pthread_mutex_t lock_log,lock_shutdown,lock_exec_hash,lock_launch_thd;
+pthread_cond_t cond_launch_thd;
+pthread_t loop_th,launch_msg_th;
 int manager_sock = -1;
+uchar* stack_bottom=0;
 struct sockaddr_in manager_addr;
 ulong manager_bind_addr = INADDR_ANY;
 int manager_back_log = MANAGER_BACK_LOG;
 int in_shutdown = 0, shutdown_requested=0;
+int manager_connect_retries=MANAGER_CONNECT_RETRIES;
 const char* manager_greeting = MANAGER_GREETING;
 uint manager_max_cmd_len = MANAGER_MAX_CMD_LEN;
+const char* manager_pw_file=MANAGER_PW_FILE;
 int one_thread = 0; /* for debugging */
 
 /* messages */
 
 #define MAX_CLIENT_MSG_LEN  256
 #define NET_BLOCK    2048
+#define MD5_LEN      32
 #define ESCAPE_CHAR '\\'
 #define EOL_CHAR '\n'
 
@@ -112,20 +144,52 @@ struct manager_thd
   int fatal,finished;
 };
 
-HASH exec_hash;
+struct manager_user
+{
+  char user[MAX_USER_NAME];
+  char md5_pass[MD5_LEN];
+  int user_len;
+  const char* error;
+};
+
+HASH exec_hash,user_hash;
+struct manager_exec* cur_launch_exec=0;
 
 static struct manager_thd* manager_thd_new(Vio* vio);
+
 static struct manager_exec* manager_exec_new(char* arg_start,char* arg_end);
 static void manager_exec_print(Vio* vio,struct manager_exec* e);
 static void manager_thd_free(struct manager_thd* thd);
 static void manager_exec_free(void* e);
+static void manager_exec_connect(struct manager_exec* e);
+static int manager_exec_launch(struct manager_exec* e);
+static struct manager_exec* manager_exec_by_pid(pid_t pid);
+
+static struct manager_user* manager_user_new(char* buf);
+static void manager_user_free(void* u);
+
 static char* arg_strmov(char* dest, const char* src, int n);
 static byte* get_exec_key(const byte* e, uint* len,
 			  my_bool __attribute__((unused)) t);
+static byte* get_user_key(const byte* u, uint* len,
+			  my_bool __attribute__((unused)) t);
 static uint tokenize_args(char* arg_start,char** arg_end);
 static void init_arg_array(char* arg_str,char** args,uint arg_count);
+
 typedef int (*manager_cmd_handler)(struct manager_thd*,char*,char*);
 
+static void handle_child(int __attribute__((unused)) sig);
+static void handle_sigpipe(int __attribute__((unused)) sig);
+
+/* exec() in a threaded application is full of problems
+   to solve this, we fork off a launcher at the very start
+   and communicate with it through a pipe
+*/
+static void fork_launcher();
+static void run_launcher_loop();
+int to_launcher_pipe[2],from_launcher_pipe[2];
+pid_t launcher_pid;
+int in_segfault=0;
 
 struct manager_cmd
 {
@@ -145,8 +209,17 @@ struct manager_exec
   char con_user[16];
   char con_pass[16];
   int con_port;
+  pid_t pid;
+  int exit_code;
+  pthread_mutex_t lock;
+  pthread_cond_t cond;
+  pthread_t th;
   char con_sock[FN_REFLEN];
+  char con_host[MAX_HOST];
+  MYSQL mysql;
   char* data_buf;
+  int req_len;
+  int num_args;
 };
 
 #define HANDLE_DECL(com) static int handle_ ## com (struct manager_thd* thd,\
@@ -162,6 +235,9 @@ HANDLE_NOARG_DECL(quit);
 HANDLE_NOARG_DECL(help);
 HANDLE_NOARG_DECL(shutdown);
 HANDLE_DECL(def_exec);
+HANDLE_DECL(start_exec);
+HANDLE_DECL(stop_exec);
+HANDLE_DECL(set_exec_con);
 HANDLE_NOARG_DECL(show_exec);
 
 struct manager_cmd commands[] =
@@ -170,6 +246,12 @@ struct manager_cmd commands[] =
   {"quit", "Finish session", handle_quit,4},
   {"shutdown", "Shutdown this server", handle_shutdown,8},
   {"def_exec", "Define executable entry", handle_def_exec,8},
+  {"start_exec", "Launch process defined by executable entry",
+   handle_start_exec,10},
+  {"stop_exec", "Stop process defined by executable entry",
+   handle_stop_exec,9},
+  {"set_exec_con", "Set connection parameters for executable entry",
+   handle_set_exec_con,12},
   {"show_exec","Show defined executable entries",handle_show_exec,9},
   {"help", "Print this message", handle_help,4},
   {0,0,0,0}
@@ -186,6 +268,8 @@ struct option long_options[] =
   {"greeting", required_argument, 0, 'g'},
   {"max-command-len",required_argument,0,'m'},
   {"one-thread",no_argument,0,'d'},
+  {"connect-retries",required_argument,0,'C'},
+  {"password-file",required_argument,0,'p'},
   {"version", no_argument, 0, 'V'},
   {0, 0, 0, 0}
 };
@@ -203,8 +287,70 @@ static char* read_line(struct manager_thd* thd); /* returns pointer to end of
 						 line
 					      */
 static pthread_handler_decl(process_connection,arg);
+static pthread_handler_decl(process_launcher_messages,
+			    __attribute__((unused)) arg);
 static int exec_line(struct manager_thd* thd,char* buf,char* buf_end);
 
+#ifdef DO_STACKTRACE
+void print_stacktrace();
+#endif
+
+static void handle_segfault(int sig)
+{
+  if (in_segfault)
+    exit(1);
+  in_segfault=1;
+  fprintf(errfp,"Got fatal signal %d\n",sig);
+#ifdef DO_STACKTRACE
+  print_stacktrace();
+#endif
+  exit(1);
+}
+
+static void handle_sigpipe(int __attribute__((unused)) sig)
+{
+  signal(SIGPIPE,handle_sigpipe);
+}
+
+#ifdef DO_STACKTRACE
+
+#define MAX_DEPTH 25
+#define SIGRETURN_FRAME_COUNT 1
+
+void print_stacktrace()
+{
+  uchar** fp;
+  int i;
+  LINT_INIT(fp);
+  fprintf(errfp,"Fatal errror, stacktrace follows:\n");
+#ifdef __i386__  
+  __asm__ __volatile__("movl %%ebp,%0" :"=r"(fp) :"r"(fp));
+#endif
+  if (!fp)
+  {
+    fprintf(errfp,"frame points is NULL, cannot trace stack\n");
+    return;
+  }
+  for(i=0;i<MAX_DEPTH && fp<(uchar**)stack_bottom;i++)
+  {
+#ifdef __i386__    
+    uchar** new_fp = (uchar**)*fp;
+    fprintf(errfp, "%p\n", i == SIGRETURN_FRAME_COUNT ?
+	    *(fp+17) : *(fp+1));
+#endif /* __386__ */
+    if (new_fp <= fp )
+    {
+      fprintf(errfp, "New value of fp=%p failed sanity check,\
+ terminating stack trace!\n", new_fp);
+      return;
+    }
+    fp = new_fp;
+  }
+  fprintf(errfp,"Stack trace successful\n");
+  fflush(errfp);
+}
+#endif
+
 static int exec_line(struct manager_thd* thd,char* buf,char* buf_end)
 {
   char* p=buf;
@@ -264,12 +410,167 @@ HANDLE_NOARG_DECL(shutdown)
   client_msg(thd->vio,MSG_OK,"Shutdown started, goodbye");
   thd->finished=1;
   shutdown_requested = 1;
+  if (!one_thread)
+  {
+    kill(launcher_pid,SIGTERM);
+    pthread_kill(loop_th,SIGTERM);
+  }
+  return 0;
+}
+
+HANDLE_DECL(set_exec_con)
+{
+  int num_args;
+  const char* error=0;
+  struct manager_exec* e;
+  char* arg_p;
+  if ((num_args=tokenize_args(args_start,&args_end))<2)
+  {
+    error="Too few arguments";
+    goto err;
+  }
+  arg_p=args_start;
+  pthread_mutex_lock(&lock_exec_hash);
+  if (!(e=(struct manager_exec*)hash_search(&exec_hash,arg_p,
+					    strlen(arg_p))))
+  {
+    pthread_mutex_unlock(&lock_exec_hash);
+    error="Exec definition entry does not exist";
+    goto err;
+  }
+  arg_p+=strlen(arg_p)+1;
+  arg_p+=(strnmov(e->con_user,arg_p,sizeof(e->con_user))-e->con_user)+1;
+  if (num_args >= 3)
+  {
+    arg_p+=(strnmov(e->con_host,arg_p,sizeof(e->con_host))-e->con_host)+1;
+    if (num_args == 4)
+    {
+      if (!(e->con_port=atoi(arg_p)))
+	strnmov(e->con_sock,arg_p,sizeof(e->con_sock));
+      else
+	e->con_sock[0]=0;
+    }
+    else
+    {
+      pthread_mutex_unlock(&lock_exec_hash);
+      error="Too many arguments";
+      goto err;
+    }
+  }
+  pthread_mutex_unlock(&lock_exec_hash);
+  client_msg(thd->vio,MSG_OK,"Entry updated");
+  return 0;
+err:
+  client_msg(thd->vio,MSG_CLIENT_ERR,error);
+  return 1;
+}
+
+HANDLE_DECL(start_exec)
+{
+  int num_args;
+  struct manager_exec* e;
+  int ident_len;
+  const char* error=0;
+  struct timespec t;
+  if ((num_args=tokenize_args(args_start,&args_end))<1)
+  {
+    error="Too few arguments";
+    goto err;
+  }
+  ident_len=strlen(args_start);
+  pthread_mutex_lock(&lock_exec_hash);
+  if (!(e=(struct manager_exec*)hash_search(&exec_hash,args_start,
+					    ident_len)))
+  {
+    pthread_mutex_unlock(&lock_exec_hash);
+    error="Exec definition entry does not exist";
+    goto err;
+  }
+  pthread_mutex_unlock(&lock_exec_hash);
+  manager_exec_launch(e);
+  if ((error=e->error))
+    goto err;
+  pthread_mutex_lock(&e->lock);
+  t.tv_sec=time(0)+atoi(args_start+ident_len+1);
+  t.tv_nsec=0;
+  pthread_cond_timedwait(&e->cond,&e->lock,&t);
+  if (!e->pid)
+  {
+    pthread_mutex_unlock(&e->lock);
+    error="Process failed to start withing alotted time";
+    goto err;
+  }
+  mysql_close(&e->mysql);
+  manager_exec_connect(e);
+  error=e->error;
+  pthread_mutex_unlock(&e->lock);
+  if (error)
+    goto err;
+  client_msg(thd->vio,MSG_OK,"'%s' started",e->ident);
+  return 0;
+err:
+  client_msg(thd->vio,MSG_CLIENT_ERR,error);
+  return 1;
+}
+
+HANDLE_DECL(stop_exec)
+{
+  int num_args;
+  struct timespec abstime;
+  struct manager_exec* e;
+  int ident_len;
+  const char* error=0;
+  if ((num_args=tokenize_args(args_start,&args_end))<2)
+  {
+    error="Too few arguments";
+    goto err;
+  }
+  ident_len=strlen(args_start);
+  abstime.tv_sec=time(0)+atoi(args_start+1+ident_len);
+  abstime.tv_nsec=0;
+  pthread_mutex_lock(&lock_exec_hash);
+  if (!(e=(struct manager_exec*)hash_search(&exec_hash,args_start,
+					    ident_len)))
+  {
+    pthread_mutex_unlock(&lock_exec_hash);
+    error="Exec definition entry does not exist";
+    goto err;
+  }
+  pthread_mutex_unlock(&lock_exec_hash);
+  pthread_mutex_lock(&e->lock);
+  e->th=pthread_self();
+  if (!e->pid)
+  {
+    e->th=0;
+    pthread_mutex_unlock(&e->lock);
+    error="Process not running";
+    goto err;
+  }
+  if (mysql_shutdown(&e->mysql))
+  {
+    e->th=0;
+    pthread_mutex_unlock(&e->lock);
+    error="Could not send shutdown command";
+    goto err;
+  }
+  pthread_cond_timedwait(&e->cond,&e->lock,&abstime);
+  if (e->pid)
+    error="Process failed to terminate within alotted time";
+  e->th=0;
+  pthread_mutex_unlock(&e->lock);
+  if (!error)
+  {
+    client_msg(thd->vio,MSG_OK,"'%s' terminated",e->ident);
     return 0;
+  }
+err:
+  client_msg(thd->vio,MSG_CLIENT_ERR,error);
+  return 1;
 }
 
 HANDLE_DECL(def_exec)
 {
-  struct manager_exec* e=0;
+  struct manager_exec* e=0,*old_e;
   const char* error=0;
   if (!(e=manager_exec_new(args_start,args_end)))
   {
@@ -282,6 +583,13 @@ HANDLE_DECL(def_exec)
     goto err;
   }
   pthread_mutex_lock(&lock_exec_hash);
+  if ((old_e=(struct manager_exec*)hash_search(&exec_hash,(byte*)e->ident,
+					       e->ident_len)))
+  {
+    pthread_mutex_unlock(&lock_exec_hash);
+    error="Exec definition already exists";
+    goto err;
+  }
   hash_insert(&exec_hash,(byte*)e);
   pthread_mutex_unlock(&lock_exec_hash);
   client_msg(thd->vio,MSG_OK,"Exec definition created");
@@ -296,7 +604,8 @@ err:
 HANDLE_NOARG_DECL(show_exec)
 {
   uint i;
-  client_msg_pre(thd->vio,MSG_INFO,"Exec_def\tArguments");
+  client_msg_pre(thd->vio,MSG_INFO,"Exec_def\tPid\tExit_status\tCon_info\
+\tArguments");
   pthread_mutex_lock(&lock_exec_hash);
   for (i=0;i<exec_hash.records;i++)
   {
@@ -308,6 +617,73 @@ HANDLE_NOARG_DECL(show_exec)
   return 0;
 }
 
+static struct manager_exec* manager_exec_by_pid(pid_t pid)
+{
+  struct manager_exec* e;
+  uint i;
+  pthread_mutex_lock(&lock_exec_hash);
+  for (i=0;i<exec_hash.records;i++)
+  {
+    e=(struct manager_exec*)hash_element(&exec_hash,i);
+    if (e->pid==pid)
+    {
+      pthread_mutex_unlock(&lock_exec_hash);
+      return e;
+    }
+  }
+ pthread_mutex_unlock(&lock_exec_hash);
+ return 0;					 
+}
+
+static void manager_exec_connect(struct manager_exec* e)
+{
+  int i;
+  for (i=0;i<manager_connect_retries;i++)
+  {
+    if (mysql_real_connect(&e->mysql,e->con_host,e->con_user,e->con_pass,0,
+			   e->con_port,e->con_sock,0))
+      return;
+    sleep(1);
+  }
+  e->error="Could not connect to MySQL server withing the number of tries";
+}
+
+static int manager_exec_launch(struct manager_exec* e)
+{
+  if (one_thread)
+  {
+    pid_t tmp_pid;
+    switch ((tmp_pid=fork()))
+    {
+    case -1:
+      e->error="Cannot fork";
+      return 1;
+    case 0:
+    {
+      int err_code;
+      close(manager_sock);
+      err_code=execv(e->bin_path,e->args);
+      exit(err_code);
+    }
+    default:
+      e->pid=tmp_pid;
+      manager_exec_connect(e);
+      return 0;
+    }
+  }
+  else
+  {
+    if (write(to_launcher_pipe[1],&e->req_len,sizeof(int))!=sizeof(int) ||
+	write(to_launcher_pipe[1],&e->num_args,sizeof(int))!=sizeof(int) ||
+	write(to_launcher_pipe[1],e->data_buf,e->req_len)!=e->req_len)
+    {
+      e->error="Failed write request to launcher";
+      return 1;
+    }
+  }
+  return 0;
+}
+
 static char* arg_strmov(char* dest, const char* src, int n)
 {
   char* dest_end = dest+n-1;
@@ -324,16 +700,42 @@ static char* arg_strmov(char* dest, const char* src, int n)
 static void manager_exec_print(Vio* vio,struct manager_exec* e)
 {
   char buf[MAX_CLIENT_MSG_LEN];
-  char* p=buf,*buf_end=buf+sizeof(buf);
+  char* p=buf,*buf_end=buf+sizeof(buf)-1;
   char** args=e->args;
   
-  p=arg_strmov(p,e->ident,(int)(buf_end-p)-2);
+  p=arg_strmov(p,e->ident,(int)(buf_end-p)-1);
+  *p++='\t';
+  if (p>buf_end-15)
+    goto end;
+  p=int10_to_str(e->pid,p,10);
+  *p++='\t';
+  p=int10_to_str(e->exit_code,p,10);
+  *p++='\t';
+  
+  p=arg_strmov(p,e->con_user,(int)(buf_end-p)-1);
+  *p++='@';
+  if (p==buf_end)
+    goto end;
+  p=arg_strmov(p,e->con_host,(int)(buf_end-p)-11);
+  *p++=':';
+  if (p==buf_end-10)
+    goto end;
+  if (e->con_sock[0])
+  {
+    p=arg_strmov(p,e->con_sock,(int)(buf_end-p)-1);
+  }
+  else
+  {
+    p=int10_to_str(e->con_port,p,10);
+  }
   *p++='\t';
+  
   for(;p<buf_end && *args;args++)
   {
-    p=arg_strmov(p,*args,(int)(buf_end-p)-2);
+    p=arg_strmov(p,*args,(int)(buf_end-p)-1);
     *p++='\t';
   }
+end:  
   *p=0;
   client_msg_pre(vio,MSG_INFO,buf);
   return;
@@ -428,6 +830,64 @@ LOG_MSG_FUNC(debug,DEBUG)
 inline void log_debug(char* __attribute__((unused)) fmt,...) {}
 #endif
 
+static pthread_handler_decl(process_launcher_messages,
+			    __attribute__((unused)) arg)
+{
+  my_thread_init();
+  for (;!in_shutdown;)
+  {
+    pid_t pid;
+    struct manager_exec* e;
+    char buf[MAX_LAUNCHER_MSG];
+    if (read(from_launcher_pipe[0],buf,MAX_LAUNCHER_MSG)<0)
+    {
+      log_err("error reading launcher message");
+      sleep(1);
+      continue;
+    }
+    switch (buf[0])
+    {
+    case CHILD_START:
+    {
+      char* ident=buf+1;
+      int ident_len=strlen(ident);
+      memcpy(&pid,ident+ident_len+1,sizeof(pid));
+      log_debug("process message - ident=%s,ident_len=%d,pid=%d",ident,
+		ident_len,pid);
+      pthread_mutex_lock(&lock_exec_hash);
+      log_debug("hash has %d records",exec_hash.records);
+      e=(struct manager_exec*)hash_search(&exec_hash,ident,ident_len);
+      if (e)
+      {
+	pthread_mutex_lock(&e->lock);
+	e->pid=pid;
+	pthread_cond_broadcast(&e->cond);
+	pthread_mutex_unlock(&e->lock);
+      }
+      pthread_mutex_unlock(&lock_exec_hash);
+      log_debug("unlocked mutex");
+      break;
+    }
+    case CHILD_STOP:
+      memcpy(&pid,buf+1,sizeof(pid));
+      e=manager_exec_by_pid(pid);
+      if (e)
+      {
+	pthread_mutex_lock(&e->lock);
+	e->pid=0;
+	memcpy(&e->exit_code,buf+1+sizeof(pid),sizeof(int));
+	pthread_cond_broadcast(&e->cond);
+	pthread_mutex_unlock(&e->lock);
+      }
+      break;
+    default:
+      log_err("Got invalid launcher message");
+      break;
+    }
+  }
+  return 0;
+}
+
 static pthread_handler_decl(process_connection,arg)
 {
   struct manager_thd* thd = (struct manager_thd*)arg;
@@ -525,6 +985,23 @@ static char* read_line(struct manager_thd* thd)
   return 0;
 }
 
+static void handle_child(int __attribute__((unused)) sig)
+{
+  pid_t child;
+  int child_status;
+  
+  for(;(child=waitpid(-1,&child_status,WNOHANG))>0;)
+  {
+    char msg_buf[1+sizeof(int)+sizeof(int)];
+    msg_buf[0]=CHILD_STOP;
+    memcpy(msg_buf+1,&child,sizeof(int));
+    memcpy(msg_buf+1+sizeof(int),&child_status,sizeof(int));
+    if (write(from_launcher_pipe[1],msg_buf,sizeof(msg_buf))!=sizeof(msg_buf))
+      log_err("launcher: error writing message on child exit"); 
+  }
+  signal(SIGCHLD,handle_child);
+}
+
 struct manager_thd* manager_thd_new(Vio* vio)
 {
   struct manager_thd* tmp;
@@ -565,6 +1042,7 @@ static void clean_up()
   log_info("Ended");
   if (errfp != stderr)
     fclose(errfp);
+  hash_free(&exec_hash);
 }
 
 static void print_version(void)
@@ -593,13 +1071,16 @@ static void usage()
   -B, --tcp-backlog==...   Size of TCP/IP listen queue.\n\
   -g, --greeting=          Set greeting on connect \n\
   -m, --max-command-len    Maximum command length \n\
+  -d, --one-thread         Use one thread ( for debugging)  \n\
+  -C, --connect-retries    Number of attempts to establish MySQL connection \n\
+  -m, --max-command-len    Maximum command length \n\
   -V, --version            Output version information and exit.\n\n");
 }
 
 static int parse_args(int argc, char **argv)
 {
   int c, option_index = 0;
-  while ((c=getopt_long(argc,argv,"P:?#:Vl:b:B:g:m:d",
+  while ((c=getopt_long(argc,argv,"P:?#:Vl:b:B:g:m:dC:p:",
 			long_options,&option_index)) != EOF)
   {
     switch (c)
@@ -610,6 +1091,12 @@ static int parse_args(int argc, char **argv)
       case 'd':
 	one_thread=1;
 	break;
+      case 'p':
+	manager_pw_file=MANAGER_PW_FILE;
+	break;
+      case 'C':
+        manager_connect_retries=atoi(optarg);
+	break;
       case 'P':
 	manager_port=atoi(optarg);
 	break;
@@ -729,6 +1216,15 @@ static FILE* open_log_stream()
   return fp;
 }
 
+static byte* get_user_key(const byte* u, uint* len,
+			  my_bool __attribute__((unused)) t)
+{
+  register const char* key;
+  key = ((struct manager_user*)u)->user;
+  *len = ((struct manager_user*)u)->user_len;
+  return (byte*)key;
+}
+
 static byte* get_exec_key(const byte* e, uint* len,
 			 my_bool __attribute__((unused)) t)
 {
@@ -827,7 +1323,9 @@ static struct manager_exec* manager_exec_new(char* arg_start,char* arg_end)
   }
   tmp->data_buf=(char*)tmp+sizeof(*tmp);
   memcpy(tmp->data_buf,arg_start,arg_len);
+  tmp->req_len=arg_len;
   tmp->args=(char**)(tmp->data_buf+arg_len);
+  tmp->num_args=num_args; 
   tmp->ident=tmp->data_buf;
   tmp->ident_len=strlen(tmp->ident);
   first_arg=tmp->ident+tmp->ident_len+1;
@@ -836,21 +1334,176 @@ static struct manager_exec* manager_exec_new(char* arg_start,char* arg_end)
   tmp->con_pass[0]=0;
   tmp->con_sock[0]=0;
   tmp->con_port=MYSQL_PORT;
+  memcpy(tmp->con_host,"localhost",10);
   tmp->bin_path=tmp->args[0];
+  tmp->pid=0;
+  tmp->exit_code=0;
+  tmp->th=0;
+  pthread_mutex_init(&tmp->lock,0);
+  pthread_cond_init(&tmp->cond,0);
+  mysql_init(&tmp->mysql);
   tmp->error=0;
   return tmp;
 }
 
-
 static void manager_exec_free(void* e)
 {
+  mysql_close(&((struct manager_exec*)e)->mysql);
   my_free(e,MYF(0));
 }
 
+static struct manager_user* manager_user_new(char* buf)
+{
+  struct manager_user* tmp;
+  char* p,*user_end;
+  char c;
+  if (!(tmp=(struct manager_user*)my_malloc(sizeof(*tmp),MYF(0))))
+    return 0;
+  p=tmp->user;
+  user_end=p+MAX_USER_NAME-1;
+  for (;(c=*buf) && p<user_end;buf++)
+  {
+    if (c == ':')
+    {
+      *p=0;
+      tmp->user_len=p-tmp->user;
+      buf++;
+      break;
+    }
+    else
+      *p++=c;
+  }
+  if (!c)
+    tmp->error="Missing ':'";
+  if (p == user_end)
+    tmp->error="Username too long";
+  if (tmp->error)
+    return tmp;
+  if (strlen(buf) < MD5_LEN)
+  {
+    tmp->error="Invalid MD5 sum, too short";
+    return tmp;
+  }
+  memcpy(tmp->md5_pass,buf,MD5_LEN);
+  tmp->error=0;
+  return tmp;
+}
+
+static void manager_user_free(void* u)
+{
+  my_free((gptr)u,MYF(0));
+}
+
+static void init_user_hash()
+{
+  FILE* f;
+  char buf[80];
+  int line_num=1;
+  if (hash_init(&user_hash,1024,0,0,get_user_key,manager_user_free,MYF(0)))
+    die("Could not initialize user hash");
+  if (!(f=fopen(manager_pw_file,"r")))
+    die("Could not open password file '%s'", manager_pw_file);
+  for (;;line_num++)
+  {
+    struct manager_user* u;
+    if (!fgets(buf,sizeof(buf),f) || feof(f))
+      break;
+    if (buf[0] == '#')
+      continue;
+    if (!(u=manager_user_new(buf)))
+      die("Out of memory while reading user line");
+    if (u->error)
+    {
+      die("Error on line %d of '%s': %s",line_num,manager_pw_file, u->error);
+    }
+    else
+    {
+      hash_insert(&user_hash,(gptr)u);
+    }
+  }
+  fclose(f);
+}
+
 static void init_globals()
 {
   if (hash_init(&exec_hash,1024,0,0,get_exec_key,manager_exec_free,MYF(0)))
     die("Exec hash initialization failed");
+  if (!one_thread)
+  {
+    fork_launcher();
+    if (pthread_create(&launch_msg_th,0,process_launcher_messages,0))
+      die("Could not start launcher message handler thread");
+  }
+  init_user_hash();
+  loop_th=pthread_self();
+  signal(SIGPIPE,handle_sigpipe);
+}
+
+static void run_launcher_loop()
+{
+  for (;;)
+  {
+    int req_len,ident_len,num_args;
+    char* request_buf=0;
+    pid_t pid;
+    char* exec_path,*ident;
+    char** args=0;
+    
+    if (read(to_launcher_pipe[0],&req_len,sizeof(int))!=sizeof(int) ||
+	read(to_launcher_pipe[0],&num_args,sizeof(int))!=sizeof(int) ||
+	!(request_buf=(char*)my_malloc(req_len+sizeof(pid)+2,MYF(0))) ||
+	!(args=(char**)my_malloc(num_args*sizeof(char*),MYF(0))) ||
+	read(to_launcher_pipe[0],request_buf+1,req_len)!=req_len)
+    {
+      log_err("launcher: Error reading request");
+      my_free((gptr)request_buf,MYF(MY_ALLOW_ZERO_PTR));
+      my_free((gptr)args,MYF(MY_ALLOW_ZERO_PTR));
+      sleep(1);
+      continue;
+    }
+    ident=request_buf+1;
+    ident_len=strlen(ident);
+    exec_path=ident+ident_len+1;
+    log_debug("num_args=%d,req_len=%d,ident=%s,ident_len=%d,exec_path=%s",
+	      num_args,
+	      req_len,ident,ident_len,exec_path);
+    init_arg_array(exec_path,args,num_args-1);    
+        
+    switch ((pid=fork()))
+    {
+    case -1:
+      log_err("launcher: cannot fork");
+      sleep(1);
+      break;
+    case 0:
+      if (execv(exec_path,args))
+	log_err("launcher: cannot exec %s",exec_path);
+      exit(1);
+    default:
+      request_buf[0]=CHILD_START;
+      memcpy(request_buf+ident_len+2,&pid,sizeof(pid));
+      if (write(from_launcher_pipe[1],request_buf,ident_len+2+sizeof(pid))<0)
+	log_err("launcher: error sending launch status report");
+      break;
+    }
+    my_free((gptr)request_buf,MYF(0));
+    my_free((gptr)args,MYF(0));
+  }
+}
+
+static void fork_launcher()
+{
+  if (pipe(to_launcher_pipe) || pipe(from_launcher_pipe))
+    die("Could not create launcher pipes");
+  switch ((launcher_pid=fork()))
+  {
+  case 0:
+    signal(SIGCHLD,handle_child);
+    run_launcher_loop();
+    exit(0);
+  case -1: die("Could not fork the launcher");
+  default: return;
+  }
 }
 
 static int daemonize()
@@ -877,12 +1530,19 @@ static int daemonize()
 
 int main(int argc, char** argv)
 {
+  char c;
+  stack_bottom=&c;
   MY_INIT(argv[0]);
   errfp = stderr;
   parse_args(argc,argv);
   pthread_mutex_init(&lock_log,0);
   pthread_mutex_init(&lock_shutdown,0);
   pthread_mutex_init(&lock_exec_hash,0);
+  pthread_mutex_init(&lock_launch_thd,0);
+  pthread_cond_init(&cond_launch_thd,0);
+#ifdef DO_STACKTRACE
+  signal(SIGSEGV,handle_segfault);
+#endif
   if (one_thread)
   {
     init_globals();