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/*
* IvyDaemon, an Ivy gateway for short-lived agents
*
* Copyright (C) 1999
* Centre d'Études de la Navigation Aérienne
*
* Main file for the super-daemon
*
* Author(s): Stephane Chatty <chatty@cenatoulouse.dgac.fr>
* from code by Patrick Amar <pa@lri.fr>
*
* $Id$
*
* Please refer to file version.h for the
* copyright notice regarding this software
*
*/
/*
* Le super-demon wixd.
*
* Il est normalement lance par inetd, avec la chaussette SOCK_DGRAM
* sur le descripteur 0, ou alors, si le symbole FROMBOOT est defini, il est
* lance depuis /etc/rc.local.
*
* Le serveur wixd:
* Il envoie un paquet connmsg de type MSG_SERVER contenant le numero
* de port sur lequel il a connecte sa chaussette.
*
* Les clients wix (wx, wxcat, etc ...):
* Ils envoient un paquet connmsg de type MSG_CLIENT ou ils demandent
* le port.
*
* L'identification de l'emetteur du paquet est le numero d'utilisateur.
*/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <memory.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <netdb.h>
#include <errno.h>
#include "ivyd.h"
const char* const dumpfilename = "/usr/tmp/wixd.db";
const int dumpfilemode = 0644;
const char* const servicename = "ivyd";
const char* const port_env_variable = "INIVYD_PORT";
const int default_port = 3006;
/*
* Definition de la table geree par le super-demon
*/
typedef struct {
short s_port; /* le port sur lequel le client communique avec son serveur */
short s_uid; /* le numero de processus du serveur wixd */
} serverinfo;
#define TABSIZ 64 /* 64 connections simultanees, ca devrait aller */
serverinfo si_table [TABSIZ];
/*
* GetInfo (name)
*
* Rend l'information concernant l'utilisateur uid.
*/
serverinfo*
GetInfo (int uid)
{
register serverinfo *si;
register serverinfo *res = 0;
for (si = si_table; si - si_table < TABSIZ; ++si) {
if (si->s_port == 0) {
if (! res)
res = si;
continue;
}
if (si->s_uid != uid)
continue;
res = si;
break;
}
return res;
}
/*
* DumpInfo ()
*
* Dumps to a file the contents of the table
*/
int
DumpInfo ()
{
register serverinfo *si;
register int fd = creat (dumpfilename, dumpfilemode);
char buf [512];
if (fd == -1)
return 0;
for (si = si_table; si - si_table < TABSIZ; ++si) {
if (! si->s_port)
continue;
(void) sprintf (buf, "user %5d, port %d\n", si->s_uid, ntohs (si->s_port));
(void) write (fd, buf, strlen (buf));
}
(void) close (fd);
return 1;
}
void
SigHup (int sig)
{
DumpInfo ();
}
void
main (int argc, const char **argv)
{
struct servent *serv;
u_short serv_port = 0;
struct sockaddr_in from;
int fromlen;
struct connmsg msg;
register serverinfo *si;
int boot = 0;
int debug = 0;
(void) signal (SIGHUP, SigHup);
serv = getservbyname (servicename, 0);
if (! serv) {
char *pp = getenv (port_env_variable);
serv_port = htons (pp ? atoi (pp) : default_port);
if (serv_port <= 0)
exit (0);
} else
serv_port = serv -> s_port;
++argv;
while (argc > 1) {
if (strcmp (*argv, "-boot") == 0 || strcmp (*argv, "-b") == 0)
boot = 1;
else if (strcmp (*argv, "-debug") == 0 || strcmp (*argv, "-d") == 0)
debug = 1;
else
fprintf (stderr, "bad option %s\n", *argv);
++argv;
--argc;
}
if (boot) {
if (!debug) {
int s;
if (fork ())
exit (0);
/* on ferme tous les descripteurs */
for (s = getdtablesize (); --s >= 0;)
close (s);
/* et on se debarrasse du terminal de controle */
if (-1 != open ("/dev/tty", 2)) {
(void) ioctl (0, TIOCNOTTY, 0);
close (0);
}
} else
close (0);
/*
* Ouvre la chaussette et l'attache a bon port
*/
if (-1 == socket (AF_INET, SOCK_DGRAM, 0))
exit (1);
memset (&from, 0, sizeof from);
from.sin_family = AF_INET;
from.sin_port = serv_port;
from.sin_addr.s_addr = INADDR_ANY;
if (-1 == bind (0, &from, sizeof from))
exit (1);
}
for (;;) {
fromlen = sizeof from;
if (recvfrom (0, (char *)&msg, sizeof msg, 0, (struct sockaddr *)&from, &fromlen) <= 0) {
if (errno == EINTR)
continue;
exit (1);
}
si = GetInfo (msg.msg_uid);
switch (msg.msg_type) {
case MSG_SERVER:
si->s_port = msg.msg_port;
si->s_uid = msg.msg_uid;
break;
case MSG_CLIENT:
msg.msg_port = si->s_port;
msg.msg_type = MSG_REPLY;
(void) sendto (0, (char *)&msg, sizeof msg, 0, (struct sockaddr *)&from, fromlen);
break;
}
}
}
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