/* INDI Server for protocol version 1.7.
 * Copyright (C) 2007 Elwood C. Downey <ecdowney@clearskyinstitute.com>
                 2013 Jasem Mutlaq <mutlaqja@ikarustech.com>
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 * argv lists names of Driver programs to run or sockets to connect for Devices.
 * Drivers are restarted if they exit or connection closes.
 * Each local Driver's stdin/out are assumed to provide INDI traffic and are
 *   connected here via pipes. Local Drivers' stderr are connected to our
 *   stderr with date stamp and driver name prepended.
 * We only support Drivers that advertise support for one Device. The problem
 *   with multiple Devices in one Driver is without a way to know what they
 *   _all_ are there is no way to avoid sending all messages to all Drivers.
 * Outbound messages are limited to Devices and Properties seen inbound.
 *   Messages to Devices on sockets always include Device so the chained
 *   indiserver will only pass back info from that Device.
 * All newXXX() received from one Client are echoed to all other Clients who
 *   have shown an interest in the same Device and property.
 *
 * Implementation notes:
 *
 * We fork each driver and open a server socket listening for INDI clients.
 * Then forever we listen for new clients and pass traffic between clients and
 * drivers, subject to optimizations based on sniffing messages for matching
 * Devices and Properties. Since one message might be destined to more than
 * one client or device, they are queued and only removed after the last
 * consumer is finished. XMLEle are converted to linear strings before being
 * sent to optimize write system calls and avoid blocking to slow clients.
 * Clients that get more than maxqsiz bytes behind are shut down.
 */

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>

#include "lilxml.h"
#include "indiapi.h"
#include "fq.h"

#define INDIPORT        7624    /* default TCP/IP port to listen */
#define	REMOTEDVR       (-1234)	/* invalid PID to flag remote drivers */
#define MAXSBUF         512
#define	MAXRBUF         49152	/* max read buffering here */
#define	MAXWSIZ         49152	/* max bytes/write */
#define	DEFMAXQSIZ      128		/* default max q behind, MB */
#define DEFMAXRESTART   10      /* default max restarts */

#ifdef OSX_EMBEDED_MODE
#define LOGNAME "/Users/%s/Library/Logs/indiserver.log"
#define FIFONAME "/tmp/indiserverFIFO"
#endif


/* associate a usage count with queuded client or device message */
typedef struct {
    int count;				/* number of consumers left */
    unsigned long cl;			/* content length */
    char *cp;				/* content: buf or malloced */
    char buf[MAXWSIZ];		/* local buf for most messages */
} Msg;

/* BLOB handling, NEVER is the default */
typedef enum {B_NEVER=0, B_ALSO, B_ONLY} BLOBHandling;

/* device + property name */
typedef struct {
    char dev[MAXINDIDEVICE];
    char name[MAXINDINAME];
    BLOBHandling blob;			/* when to snoop BLOBs */
} Property;


/* record of each snooped property
typedef struct {
    Property prop;
    BLOBHandling blob;
} Property;
*/

struct
{
    const char *name;                      /* Path to FIFO for dynamic startups & shutdowns of drivers */
    int fd;
    //FILE *fs;
} fifo;

/* info for each connected client */
typedef struct {
    int active;				/* 1 when this record is in use */
    Property *props;			/* malloced array of props we want */
    int nprops;				/* n entries in props[] */
    int allprops;			/* saw getProperties w/o device */
    BLOBHandling blob;			/* when to send setBLOBs */
    int s;				/* socket for this client */
    LilXML *lp;				/* XML parsing context */
    FQ *msgq;				/* Msg queue */
    unsigned int nsent;				/* bytes of current Msg sent so far */
} ClInfo;
static ClInfo *clinfo;			/*  malloced pool of clients */
static int nclinfo;			/* n total (not active) */

/* info for each connected driver */
typedef struct {
    char name[MAXINDINAME];		/* persistent name */
    char envDev[MAXSBUF];
    char envConfig[MAXSBUF];
    char envSkel[MAXSBUF];
    char envPrefix[MAXSBUF];
    //char dev[MAXINDIDEVICE];		/* device served by this driver */
    char **dev;             /* device served by this driver */
    int ndev;               /* number of devices served by this driver */
    int active;				/* 1 when this record is in use */
    Property *sprops;			/* malloced array of props we snoop */
    int nsprops;			/* n entries in sprops[] */
    int pid;				/* process id or REMOTEDVR if remote */
    int rfd;				/* read pipe fd */
    int wfd;				/* write pipe fd */
    int efd;				/* stderr from driver, if local */
    int restarts;			/* times process has been restarted */
    LilXML *lp;				/* XML parsing context */
    FQ *msgq;				/* Msg queue */
    unsigned int nsent;			/* bytes of current Msg sent so far */
} DvrInfo;
static DvrInfo *dvrinfo;		/* malloced array of drivers */
static int ndvrinfo;			/* n total */

static char *me;			/* our name */
static int port = INDIPORT;		/* public INDI port */
static int verbose;			/* chattiness */
static int lsocket;			/* listen socket */
static char *ldir;			/* where to log driver messages */
static int maxqsiz = (DEFMAXQSIZ*1024*1024); /* kill if these bytes behind */
static int maxrestarts = DEFMAXRESTART;
static int terminateddrv = 0;

static void logStartup(int ac, char *av[]);
static void usage (void);
static void noZombies (void);
static void noSIGPIPE (void);
static void indiFIFO(void);
static void indiRun (void);
static void indiListen (void);
static void newFIFO(void);
static void newClient (void);
static int newClSocket (void);
static void shutdownClient (ClInfo *cp);
static int readFromClient (ClInfo *cp);
static void startDvr (DvrInfo *dp);
static void startLocalDvr (DvrInfo *dp);
static void startRemoteDvr (DvrInfo *dp);
static int openINDIServer (char host[], int indi_port);
static void shutdownDvr (DvrInfo *dp, int restart);
static int isDeviceInDriver(const char *dev, DvrInfo *dp);
static void q2RDrivers (const char *dev, Msg *mp, XMLEle *root);
static void q2SDrivers (int isblob, const char *dev, const char *name, Msg *mp,
    XMLEle *root);
static int q2Clients (ClInfo *notme, int isblob, const char *dev, const char *name,
    Msg *mp, XMLEle *root);
static int q2Servers (ClInfo *notme, Msg *mp, XMLEle *root);
static void addSDevice (DvrInfo *dp, const char *dev, const char *name);
static Property *findSDevice (DvrInfo *dp, const char *dev, const char *name);
static void addClDevice (ClInfo *cp, const char *dev, const char *name, int isblob);
static int findClDevice (ClInfo *cp, const char *dev, const char *name);
static int readFromDriver (DvrInfo *dp);
static int stderrFromDriver (DvrInfo *dp);
static int msgQSize (FQ *q);
static void setMsgXMLEle (Msg *mp, XMLEle *root);
static void setMsgStr (Msg *mp, char *str);
static void freeMsg (Msg *mp);
static Msg *newMsg (void);
static int sendClientMsg (ClInfo *cp);
static int sendDriverMsg (DvrInfo *cp);
static void crackBLOB (const char *enableBLOB, BLOBHandling *bp);
static void crackBLOBHandling(const char *dev, const char *name, const char *enableBLOB, ClInfo *cp);
static void traceMsg (XMLEle *root);
static char *indi_tstamp (char *s);
static void logDMsg (XMLEle *root, const char *dev);
static void Bye(void);

int
main (int ac, char *av[])
{


    /* log startup */
    logStartup(ac, av);

    /* save our name */
    me = av[0];

#ifdef OSX_EMBEDED_MODE

    char logname[128];
    snprintf(logname, 128, LOGNAME, getlogin());
    fprintf(stderr, "switching stderr to %s", logname);
    freopen(logname, "w", stderr);

    fifo.name = FIFONAME;
    verbose = 1;
    ac = 0;

#else

    /* crack args */
    while ((--ac > 0) && ((*++av)[0] == '-')) {
        char *s;
        for (s = av[0]+1; *s != '\0'; s++)
            switch (*s) {
            case 'l':
                if (ac < 2) {
                    fprintf (stderr, "-l requires log directory\n");
                    usage();
                }
                ldir = *++av;
                ac--;
                break;
            case 'm':
                if (ac < 2) {
                    fprintf (stderr, "-m requires max MB behind\n");
                    usage();
                }
                maxqsiz = 1024*1024*atoi(*++av);
                ac--;
                break;
            case 'p':
                if (ac < 2) {
                    fprintf (stderr, "-p requires port value\n");
                    usage();
                }
                port = atoi(*++av);
                ac--;
                break;
            case 'f':
                if (ac < 2) {
                    fprintf (stderr, "-f requires fifo node\n");
                    usage();
                }
                fifo.name = *++av;
                ac--;
                break;
            case 'r':
                if (ac < 2) {
                    fprintf (stderr, "-r requires number of restarts\n");
                    usage();
                }
                maxrestarts = atoi(*++av);
                if (maxrestarts < 0)
                    maxrestarts=0;
                ac--;
                break;
            case 'v':
                verbose++;
                break;
            default:
                usage();
            }
    }
#endif


    /* at this point there are ac args in av[] to name our drivers */
    if (ac == 0 && !fifo.name)
        usage();

    /* take care of some unixisms */
    noZombies();
    noSIGPIPE();

    /* realloc seed for client pool */
    clinfo = (ClInfo *) malloc (1);
    nclinfo = 0;

    /* create driver info array all at once since size never changes */
    ndvrinfo = ac;
    dvrinfo = (DvrInfo *) calloc (ndvrinfo, sizeof(DvrInfo));

    /* start each driver */
    while (ac-- > 0) {
        strncpy(dvrinfo[ac].name, *av++, MAXINDINAME);
        startDvr (&dvrinfo[ac]);
    }

    /* announce we are online */
    indiListen();

    /* Load up FIFO, if available */
    indiFIFO();

    /* handle new clients and all io */
    while (1)
        indiRun();

    /* whoa! */
    fprintf (stderr, "unexpected return from main\n");
    return (1);
}

/* record we have started and our args */
static void
logStartup(int ac, char *av[])
{
    int i;

    fprintf (stderr, "%s: startup: ", indi_tstamp(NULL));
    for (i = 0; i < ac; i++)
        fprintf (stderr, "%s ", av[i]);
    fprintf (stderr, "\n");
}

/* print usage message and exit (2) */
static void
usage(void)
{
    fprintf (stderr, "Usage: %s [options] driver [driver ...]\n", me);
    fprintf (stderr, "Purpose: server for local and remote INDI drivers\n");
    fprintf (stderr, "INDI Library: %s\nCode %s. Protocol %g.\n", CMAKE_INDI_VERSION_STRING, "$Rev$", INDIV);
    fprintf (stderr, "Options:\n");
        fprintf (stderr, " -l d     : log driver messages to <d>/YYYY-MM-DD.islog\n");
        fprintf (stderr, " -m m     : kill client if gets more than this many MB behind, default %d\n", DEFMAXQSIZ);
        fprintf (stderr, " -p p     : alternate IP port, default %d\n", INDIPORT);
        fprintf (stderr, " -r r     : maximum driver restarts on error, default %d\n", DEFMAXRESTART);
        fprintf (stderr, " -f path  : Path to fifo for dynamic startup and shutdown of drivers.\n");
        fprintf (stderr, " -v       : show key events, no traffic\n");
        fprintf (stderr, " -vv      : -v + key message content\n");
        fprintf (stderr, " -vvv     : -vv + complete xml\n");
        fprintf (stderr, "driver    : executable or device@host[:port]\n");

    exit (2);
}

/* arrange for no zombies if drivers die */
static void
noZombies()
{
    struct sigaction sa;
    sa.sa_handler = SIG_IGN;
    sigemptyset(&sa.sa_mask);
#ifdef SA_NOCLDWAIT
    sa.sa_flags = SA_NOCLDWAIT;
#else
    sa.sa_flags = 0;
#endif
    (void)sigaction(SIGCHLD, &sa, NULL);
}

/* turn off SIGPIPE on bad write so we can handle it inline */
static void
noSIGPIPE()
{
    struct sigaction sa;
    sa.sa_handler = SIG_IGN;
    sigemptyset(&sa.sa_mask);
    (void)sigaction(SIGPIPE, &sa, NULL);
}

static DvrInfo * allocDvr ()
{
    DvrInfo *dp = NULL;
    int dvi;

/* try to reuse a drivber slot, else add one */
for (dvi = 0; dvi < ndvrinfo; dvi++)
    if (!(dp = &dvrinfo[dvi])->active)
        break;
if (dvi == ndvrinfo)
{
    /* grow dvrinfo */
    dvrinfo = (DvrInfo *) realloc (dvrinfo, (ndvrinfo+1)*sizeof(DvrInfo));
    if (!dvrinfo) {
        fprintf (stderr, "no memory for new drivers\n");
        Bye();
    }
    dp = &dvrinfo[ndvrinfo++];
}

/* rig up new dvrinfo entry */
memset (dp, 0, sizeof(*dp));
dp->active = 1;
dp->ndev =0;

return dp;

}

/* start the given INDI driver process or connection.
 * exit if trouble.
 */
static void
startDvr (DvrInfo *dp)
{
    if (strchr (dp->name, '@'))
        startRemoteDvr (dp);
    else
        startLocalDvr (dp);
}

/* start the given local INDI driver process.
 * exit if trouble.
 */
static void
startLocalDvr (DvrInfo *dp)
{
    Msg *mp;
    char buf[32];
    int rp[2], wp[2], ep[2];
    int pid;

#ifdef OSX_EMBEDED_MODE
  fprintf(stderr, "STARTING \"%s\"\n", dp->name); fflush(stderr);
#endif

    /* build three pipes: r, w and error*/
    if (pipe (rp) < 0) {
        fprintf (stderr, "%s: read pipe: %s\n", indi_tstamp(NULL),
                                strerror(errno));
        Bye();
    }
    if (pipe (wp) < 0) {
        fprintf (stderr, "%s: write pipe: %s\n", indi_tstamp(NULL),
                                strerror(errno));
        Bye();
    }
    if (pipe (ep) < 0) {
        fprintf (stderr, "%s: stderr pipe: %s\n", indi_tstamp(NULL),
                                strerror(errno));
        Bye();
    }

    /* fork&exec new process */
    pid = fork();
    if (pid < 0) {
        fprintf (stderr, "%s: fork: %s\n", indi_tstamp(NULL), strerror(errno));
        Bye();
    }
    if (pid == 0) {
        /* child: exec name */
        int fd;

        /* rig up pipes */
        dup2 (wp[0], 0);	/* driver stdin reads from wp[0] */
        dup2 (rp[1], 1);	/* driver stdout writes to rp[1] */
        dup2 (ep[1], 2);	/* driver stderr writes to e[]1] */
        for (fd = 3; fd < 100; fd++)
        (void) close (fd);

        if (*dp->envDev)
          setenv("INDIDEV", dp->envDev, 1);
        /* Only reset environment variable in case of FIFO */
        else if (fifo.fd > 0)
          unsetenv("INDIDEV");
        if (*dp->envConfig)
          setenv("INDICONFIG", dp->envConfig, 1);
        else if (fifo.fd > 0)
          unsetenv("INDICONFIG");
        if (*dp->envSkel)
          setenv("INDISKEL", dp->envSkel, 1);
        else if (fifo.fd > 0)
          unsetenv("INDISKEL");
        char executable[MAXSBUF];
        if (*dp->envPrefix)
        {
          setenv("INDIPREFIX", dp->envPrefix, 1);
#ifdef OSX_EMBEDED_MODE
          snprintf(executable, MAXSBUF, "%s/Contents/MacOS/%s", dp->envPrefix, dp->name);
#else
        snprintf(executable, MAXSBUF, "%s/bin/%s", dp->envPrefix, dp->name);
#endif

        fprintf(stderr, "%s\n", executable);

          execlp (executable, dp->name, NULL);
        }
        else
        {
          if (fifo.fd > 0)
            unsetenv("INDIPREFIX");
          execlp (dp->name, dp->name, NULL);
        }

#ifdef OSX_EMBEDED_MODE
  fprintf(stderr, "FAILED \"%s\"\n", dp->name); fflush(stderr);
#endif
        fprintf (stderr, "%s: Driver %s: execlp: %s\n", indi_tstamp(NULL),
                        dp->name, strerror(errno));
        _exit (1);	/* parent will notice EOF shortly */
    }

    /* don't need child's side of pipes */
    close (wp[0]);
    close (rp[1]);
    close (ep[1]);

    /* record pid, io channels, init lp and snoop list */
    dp->pid = pid;
    dp->rfd = rp[0];
    dp->wfd = wp[1];
    dp->efd = ep[0];
    dp->lp = newLilXML();
    dp->msgq = newFQ(1);
    dp->sprops = (Property*) malloc (1);	/* seed for realloc */
    dp->nsprops = 0;
    dp->nsent = 0;
    dp->active = 1;
    dp->ndev = 0;
    dp->dev = (char **) malloc(sizeof(char *));

    /* first message primes driver to report its properties -- dev known
     * if restarting
     */
    mp = newMsg();
    pushFQ (dp->msgq, mp);
    sprintf (buf, "<getProperties version='%g'/>\n", INDIV);
    setMsgStr (mp, buf);
    mp->count++;

    if (verbose > 0)
        fprintf (stderr, "%s: Driver %s: pid=%d rfd=%d wfd=%d efd=%d\n",
            indi_tstamp(NULL), dp->name, dp->pid, dp->rfd, dp->wfd, dp->efd);
}

/* start the given remote INDI driver connection.
 * exit if trouble.
 */
static void
startRemoteDvr (DvrInfo *dp)
{
    Msg *mp;
    char dev[1024];
    char host[1024];
    char buf[1024];
    int indi_port, sockfd;

    /* extract host and port */
    indi_port = INDIPORT;
    if (sscanf (dp->name, "%[^@]@%[^:]:%d", dev, host, &indi_port) < 2) {
        fprintf (stderr, "Bad remote device syntax: %s\n", dp->name);
        Bye();
    }

    /* connect */
    sockfd = openINDIServer (host, indi_port);

    /* record flag pid, io channels, init lp and snoop list */
    dp->pid = REMOTEDVR;
    dp->rfd = sockfd;
    dp->wfd = sockfd;
    dp->lp = newLilXML();
    dp->msgq = newFQ(1);
    dp->sprops = (Property*) malloc (1);	/* seed for realloc */
    dp->nsprops = 0;
    dp->nsent = 0;
    dp->active = 1;
    dp->ndev = 1;
    dp->dev = (char **) malloc(sizeof(char *));

    /* N.B. storing name now is key to limiting outbound traffic to this
     * dev.
     */
    dp->dev[0] = (char *) malloc(MAXINDIDEVICE * sizeof(char));
    strncpy (dp->dev[0], dev, MAXINDIDEVICE-1);
    dp->dev[0][MAXINDIDEVICE-1] = '\0';

    /* Sending getProperties with device lets remote server limit its
     * outbound (and our inbound) traffic on this socket to this device.
     */
    mp = newMsg();
    pushFQ (dp->msgq, mp);
    sprintf (buf, "<getProperties device='%s' version='%g'/>\n",
             dp->dev[0], INDIV);
    setMsgStr (mp, buf);
    mp->count++;

    if (verbose > 0)
        fprintf (stderr, "%s: Driver %s: socket=%d\n", indi_tstamp(NULL),
                                dp->name, sockfd);
}

/* open a connection to the given host and port or die.
 * return socket fd.
 */
static int
openINDIServer (char host[], int indi_port)
{
    struct sockaddr_in serv_addr;
    struct hostent *hp;
    int sockfd;

    /* lookup host address */
    hp = gethostbyname (host);
    if (!hp) {
        fprintf (stderr, "gethostbyname(%s): %s\n", host, strerror(errno));
        Bye();
    }

    /* create a socket to the INDI server */
    (void) memset ((char *)&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr =
                ((struct in_addr *)(hp->h_addr_list[0]))->s_addr;
    serv_addr.sin_port = htons(indi_port);
    if ((sockfd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
        fprintf (stderr, "socket(%s,%d): %s\n", host, indi_port,strerror(errno));
        Bye();
    }

    /* connect */
    if (connect (sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr))<0){
        fprintf (stderr, "connect(%s,%d): %s\n", host,indi_port,strerror(errno));
        Bye();
    }

    /* ok */
    return (sockfd);
}

/* create the public INDI Driver endpoint lsocket on port.
 * return server socket else exit.
 */
static void
indiListen ()
{
    struct sockaddr_in serv_socket;
    int sfd;
    int reuse = 1;

    /* make socket endpoint */
    if ((sfd = socket (AF_INET, SOCK_STREAM, 0)) < 0) {
        fprintf (stderr, "%s: socket: %s\n", indi_tstamp(NULL), strerror(errno));
        Bye();
    }

    /* bind to given port for any IP address */
    memset (&serv_socket, 0, sizeof(serv_socket));
    serv_socket.sin_family = AF_INET;
    #ifdef SSH_TUNNEL
    serv_socket.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
    #else
    serv_socket.sin_addr.s_addr = htonl (INADDR_ANY);
    #endif
    serv_socket.sin_port = htons ((unsigned short)port);
    if (setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) < 0){
        fprintf (stderr, "%s: setsockopt: %s\n", indi_tstamp(NULL),
                                strerror(errno));
        Bye();
    }
    if (bind(sfd,(struct sockaddr*)&serv_socket,sizeof(serv_socket)) < 0){
        fprintf (stderr, "%s: bind: %s\n", indi_tstamp(NULL), strerror(errno));
        Bye();
    }

    /* willing to accept connections with a backlog of 5 pending */
    if (listen (sfd, 5) < 0) {
        fprintf (stderr, "%s: listen: %s\n", indi_tstamp(NULL), strerror(errno));
        Bye();
    }

    /* ok */
    lsocket = sfd;
    if (verbose > 0)
        fprintf (stderr, "%s: listening to port %d on fd %d\n",
                            indi_tstamp(NULL), port, sfd);
}

/* Attempt to open up FIFO */
static void indiFIFO(void)
{
    close(fifo.fd);
    fifo.fd=-1;

    /* Open up FIFO, if available */
    if (fifo.name)
    {
        fifo.fd = open(fifo.name, O_RDWR | O_NONBLOCK);

       if (fifo.fd < 0)
       {
           fprintf(stderr, "%s: open(%s): %s.\n", indi_tstamp(NULL), fifo.name, strerror(errno));
           Bye();
       }
    }

}

/* service traffic from clients and drivers */
static void
indiRun(void)
{
    fd_set rs, ws;
        int maxfd=0;
    int i, s;

    /* init with no writers or readers */
    FD_ZERO(&ws);
    FD_ZERO(&rs);

        if (fifo.name && fifo.fd >=0)
        {
           FD_SET(fifo.fd, &rs);
           maxfd = fifo.fd;
        }

    /* always listen for new clients */
    FD_SET(lsocket, &rs);
        if (lsocket > maxfd)
                maxfd = lsocket;

    /* add all client readers and client writers with work to send */
    for (i = 0; i < nclinfo; i++) {
        ClInfo *cp = &clinfo[i];
        if (cp->active) {
        FD_SET(cp->s, &rs);
        if (nFQ(cp->msgq) > 0)
            FD_SET(cp->s, &ws);
        if (cp->s > maxfd)
            maxfd = cp->s;
        }
    }

    /* add all driver readers and driver writers with work to send */
        for (i = 0; i < ndvrinfo; i++)
        {
        DvrInfo *dp = &dvrinfo[i];
            if (dp->active)
            {
                FD_SET(dp->rfd, &rs);
                if (dp->rfd > maxfd)
                   maxfd = dp->rfd;
                if (dp->pid != REMOTEDVR)
                {
                   FD_SET(dp->efd, &rs);
                   if (dp->efd > maxfd)
                      maxfd = dp->efd;
                }
                if (nFQ(dp->msgq) > 0)
                {
                   FD_SET(dp->wfd, &ws);
                   if (dp->wfd > maxfd)
                       maxfd = dp->wfd;
                }
            }
    }

    /* wait for action */
    s = select (maxfd+1, &rs, &ws, NULL, NULL);
    if (s < 0) {
        fprintf (stderr, "%s: select(%d): %s\n", indi_tstamp(NULL), maxfd+1,
                                strerror(errno));
        Bye();
    }


        /* new command from FIFO? */
        if (s > 0 && fifo.fd >= 0 && FD_ISSET(fifo.fd, &rs))
        {
            newFIFO();
            s--;
        }

    /* new client? */
    if (s > 0 && FD_ISSET(lsocket, &rs)) {
        newClient();
        s--;
    }

    /* message to/from client? */
    for (i = 0; s > 0 && i < nclinfo; i++) {
        ClInfo *cp = &clinfo[i];
        if (cp->active) {
        if (FD_ISSET(cp->s, &rs)) {
            if (readFromClient(cp) < 0)
            return;	/* fds effected */
            s--;
        }
        if (s > 0 && FD_ISSET(cp->s, &ws)) {
            if (sendClientMsg(cp) < 0)
            return;	/* fds effected */
            s--;
        }
        }
    }

    /* message to/from driver? */
    for (i = 0; s > 0 && i < ndvrinfo; i++) {
        DvrInfo *dp = &dvrinfo[i];
        if (dp->pid != REMOTEDVR && FD_ISSET(dp->efd, &rs)) {
        if (stderrFromDriver(dp) < 0)
            return;	/* fds effected */
        s--;
        }
        if (s > 0 && FD_ISSET(dp->rfd, &rs)) {
        if (readFromDriver(dp) < 0)
            return;	/* fds effected */
        s--;
        }
        if (s > 0 && FD_ISSET(dp->wfd, &ws) && nFQ(dp->msgq) > 0) {
        if (sendDriverMsg(dp) < 0)
           return;	/* fds effected */
        s--;
        }
    }
}

int isDeviceInDriver(const char *dev, DvrInfo *dp)
{
    int i=0;
    for (i=0; i <dp->ndev; i++)
    {
        if (!strcmp(dev, dp->dev[i]))
            return 1;
    }

    return 0;
}

/* Read commands from FIFO and process them. Start/stop drivers accordingly */
static void newFIFO(void)
{
    //char line[MAXRBUF], tDriver[MAXRBUF], tConfig[MAXRBUF], tDev[MAXRBUF], tSkel[MAXRBUF], envDev[MAXRBUF], envConfig[MAXRBUF], envSkel[MAXR];
    char line[MAXRBUF];
    DvrInfo *dp = NULL;
    int startCmd=0, i=0, remoteDriver=0;

    while (i < MAXRBUF)
    {
        if (read(fifo.fd, line+i, 1) <= 0)
        {
            // Reset FIFO now, otherwise select will always return with no data from FIFO.
            indiFIFO();
            return;
        }

        if (line[i] == '\n')
        {
            line[i] = '\0';
            i=0;
        }
        else
        {
          i++;
          continue;
        }

     if (verbose)
            fprintf(stderr, "FIFO: %s\n", line);

     char cmd[MAXSBUF], arg[4][1], var[4][MAXSBUF], tDriver[MAXSBUF], tName[MAXSBUF], envDev[MAXSBUF], envConfig[MAXSBUF], envSkel[MAXSBUF], envPrefix[MAXSBUF];

     memset(&tDriver[0], 0, sizeof(MAXSBUF));
     memset(&tName[0], 0, sizeof(MAXSBUF));
     memset(&envDev[0], 0, sizeof(MAXSBUF));
     memset(&envConfig[0], 0, sizeof(MAXSBUF));
     memset(&envSkel[0], 0, sizeof(MAXSBUF));
     memset(&envPrefix[0], 0, sizeof(MAXSBUF));

     int n = 0;

     // If remote driver
     if (strstr(line, "@"))
     {
         n = sscanf(line, "%s %512[^\n]", cmd, tDriver);

         // Remove quotes if any
         char * ptr = tDriver;
         int len = strlen(tDriver);
         while ( ptr = strstr(tDriver, "\"") )
         {
           memmove(ptr, ptr+1, --len);
           ptr[len] = '\0';
         }

         //fprintf(stderr, "Remote Driver: %s\n", tDriver);
         remoteDriver = 1;
     }
     // If local driver
     else
     {
         n = sscanf(line, "%s %s -%1c \"%512[^\"]\" -%1c \"%512[^\"]\" -%1c \"%512[^\"]\" -%1c \"%512[^\"]\"", cmd, tDriver, arg[0], var[0], arg[1], var[1]
                    , arg[2], var[2], arg[3], var[3]);
         remoteDriver = 0;
     }

     int n_args = (n - 2)/2;

     int j=0;
     for (j=0; j < n_args; j++)
     {
         //fprintf(stderr, "arg[%d]: %c\n", i, arg[j][0]);
         //fprintf(stderr, "var[%d]: %s\n", i, var[j]);

         if (arg[j][0] == 'n')
         {
             strncpy(tName, var[j], MAXSBUF-1);
             tName[MAXSBUF-1] = '\0';

             if (verbose)
                fprintf(stderr, "With name: %s\n", envDev);
         }
         else if (arg[j][0] == 'c')
         {
             strncpy(envConfig, var[j], MAXSBUF-1);
             envConfig[MAXSBUF-1] = '\0';

             if (verbose)
              fprintf(stderr, "With config: %s\n", envConfig);
         }
         else if (arg[j][0] == 's')
         {
             strncpy(envSkel, var[j], MAXSBUF-1);
             envSkel[MAXSBUF-1] = '\0';

             if (verbose)
              fprintf(stderr, "With skeketon: %s\n", envSkel);
         }
         else if (arg[j][0] == 'p')
         {
             strncpy(envPrefix, var[j], MAXSBUF-1);
             envPrefix[MAXSBUF-1] = '\0';

             if (verbose)
              fprintf(stderr, "With prefix: %s\n", envPrefix);
         }
     }

     if (!strcmp(cmd, "start"))
         startCmd = 1;
     else
         startCmd = 0;

    if (startCmd)
    {
          if (verbose)
             fprintf(stderr, "FIFO: Starting driver %s\n", tDriver);
          dp = allocDvr();
          strncpy(dp->name, tDriver, MAXINDIDEVICE);

          if (remoteDriver == 0)
          {
              //strncpy(dp->dev, tName, MAXINDIDEVICE);
              strncpy(dp->envDev, tName, MAXSBUF);
              strncpy(dp->envConfig, envConfig, MAXSBUF);
              strncpy(dp->envSkel, envSkel, MAXSBUF);
              strncpy(dp->envPrefix, envPrefix, MAXSBUF);
              startDvr (dp);
          }
          else
              startRemoteDvr(dp);
    }
    else
    {
     for (dp = dvrinfo; dp < &dvrinfo[ndvrinfo]; dp++)
     {
         fprintf(stderr, "dp->name: %s - tDriver: %s\n", dp->name, tDriver);
         if (!strcmp(dp->name, tDriver) && dp->active==1)
         {
             fprintf(stderr, "name: %s - dp->dev[0]: %s\n", tName, dp->dev[0]);

            /* If device name is given, check against it before shutting down */
             //if (tName[0] && strcmp(dp->dev[0], tName))
             if (tName[0] && isDeviceInDriver(tName, dp) == 0)
                  continue;
           if (verbose)
               fprintf(stderr, "FIFO: Shutting down driver: %s\n", tDriver);

            for (i=0; i < dp->ndev; i++)
            {
                /* Inform clients that this driver is dead */
                XMLEle *root = addXMLEle (NULL, "delProperty");
                addXMLAtt(root, "device", dp->dev[i]);

                prXMLEle(stderr, root, 0);
                Msg * mp = newMsg();

                q2Clients(NULL, 0, dp->dev[i], NULL, mp, root);
               if (mp->count > 0)
                   setMsgXMLEle (mp, root);
               else
                   freeMsg (mp);
              delXMLEle (root);
            }

            shutdownDvr(dp, 0);
         break;
         }
     }
    }
   }
}

/* prepare for new client arriving on lsocket.
 * exit if trouble.
 */
static void
newClient()
{
    ClInfo *cp = NULL;
    int s, cli;

    /* assign new socket */
    s = newClSocket ();

    /* try to reuse a clinfo slot, else add one */
    for (cli = 0; cli < nclinfo; cli++)
        if (!(cp = &clinfo[cli])->active)
        break;
    if (cli == nclinfo) {
        /* grow clinfo */
        clinfo = (ClInfo *) realloc (clinfo, (nclinfo+1)*sizeof(ClInfo));
        if (!clinfo) {
        fprintf (stderr, "no memory for new client\n");
        Bye();
        }
        cp = &clinfo[nclinfo++];
    }

    /* rig up new clinfo entry */
    memset (cp, 0, sizeof(*cp));
    cp->active = 1;
    cp->s = s;
    cp->lp = newLilXML();
    cp->msgq = newFQ(1);
    cp->props = malloc (1);
    cp->nsent = 0;

    if (verbose > 0) {
        struct sockaddr_in addr;
        socklen_t len = sizeof(addr);
        getpeername(s, (struct sockaddr*)&addr, &len);
        fprintf(stderr,"%s: Client %d: new arrival from %s:%d - welcome!\n",
                indi_tstamp(NULL), cp->s, inet_ntoa(addr.sin_addr),
                            ntohs(addr.sin_port));
    }
#ifdef OSX_EMBEDED_MODE
  int active = 0;
  for (int i = 0; i < nclinfo; i++)
    if (clinfo[i].active)
      active++;
  fprintf(stderr, "CLIENTS %d\n", active); fflush(stderr);
#endif
}

/* read more from the given client, send to each appropriate driver when see
 * xml closure. also send all newXXX() to all other interested clients.
 * return -1 if had to shut down anything, else 0.
 */
static int
readFromClient (ClInfo *cp)
{
    char buf[MAXRBUF];
    int shutany = 0;
    ssize_t i, nr;

    /* read client */
    nr = read (cp->s, buf, sizeof(buf));
    if (nr <= 0)
    {
        if (nr < 0)
        fprintf (stderr, "%s: Client %d: read: %s\n", indi_tstamp(NULL),
                            cp->s, strerror(errno));
        else if (verbose > 0)
        fprintf (stderr, "%s: Client %d: read EOF\n", indi_tstamp(NULL),
                                    cp->s);
        shutdownClient (cp);
        return (-1);
    }

    /* process XML, sending when find closure */
    for (i = 0; i < nr; i++)
    {
        char err[1024];
        XMLEle *root = readXMLEle (cp->lp, buf[i], err);
        if (root)
        {
        char *roottag = tagXMLEle(root);
        const char *dev = findXMLAttValu (root, "device");
        const char *name = findXMLAttValu (root, "name");
        int isblob = !strcmp (tagXMLEle(root), "setBLOBVector");
        Msg *mp;

        if (verbose > 2)
        {
            fprintf (stderr, "%s: Client %d: read ",indi_tstamp(NULL),cp->s);
            traceMsg (root);
        }
        else if (verbose > 1)
        {
            fprintf (stderr, "%s: Client %d: read <%s device='%s' name='%s'>\n",
                    indi_tstamp(NULL), cp->s, tagXMLEle(root),
                    findXMLAttValu (root, "device"),
                    findXMLAttValu (root, "name"));
        }

        /* snag interested properties.
         * N.B. don't open to alldevs if seen specific dev already, else
         *   remote client connections start returning too much.
         */
        if (dev[0])
            addClDevice (cp, dev, name, isblob);
        else if (!strcmp (roottag, "getProperties") && !cp->nprops)
            cp->allprops = 1;

        /* snag enableBLOB -- send to remote drivers too */
        if (!strcmp (roottag, "enableBLOB"))
            crackBLOBHandling (dev, name, pcdataXMLEle(root), cp);

        /* build a new message -- set content iff anyone cares */
        mp = newMsg();

        /* send message to driver(s) responsible for dev */
        q2RDrivers (dev, mp, root);

        /* JM 2016-05-18: Upstream client can be a chained INDI server. If any driver locally is snooping
         * on any remote drivers, we should catch it and forward it to the responsible snooping driver. */
        /* send to snooping drivers. */
        // JM 2016-05-26: Only forward setXXX messages
        if (!strncmp (roottag, "set", 3))
            q2SDrivers (isblob, dev, name, mp, root);

        /* echo new* commands back to other clients */
        if (!strncmp (roottag, "new", 3))
        {
            if (q2Clients (cp, isblob, dev, name, mp, root) < 0)
                shutany++;
        }

        /* set message content if anyone cares else forget it */
        if (mp->count > 0)
            setMsgXMLEle (mp, root);
        else
            freeMsg (mp);
        delXMLEle (root);

        }
        else if (err[0])
        {
        char *ts = indi_tstamp(NULL);
        fprintf (stderr, "%s: Client %d: XML error: %s\n", ts, cp->s, err);
        fprintf (stderr, "%s: Client %d: XML read: %.*s\n", ts, cp->s, (int)nr, buf);
        shutdownClient (cp);
        return (-1);
        }
    }

    return (shutany ? -1 : 0);
}

/* read more from the given driver, send to each interested client when see
 * xml closure. if driver dies, try restarting.
 * return 0 if ok else -1 if had to shut down anything.
 */
static int
readFromDriver (DvrInfo *dp)
{
    char buf[MAXRBUF];
    int shutany = 0;
    ssize_t i, nr;
    char err[1024];
    XMLEle **nodes;
    XMLEle *root;
    int inode=0;
    
    /* read driver */
    nr = read (dp->rfd, buf, sizeof(buf));
    if (nr <= 0)
    {
        if (nr < 0)
            fprintf (stderr, "%s: Driver %s: stdin %s\n", indi_tstamp(NULL), dp->name, strerror(errno));
        else
            fprintf (stderr, "%s: Driver %s: stdin EOF\n", indi_tstamp(NULL), dp->name);

        shutdownDvr (dp, 1);
        return (-1);
    }

    /* process XML chunk */
    nodes=parseXMLChunk(dp->lp, buf, nr, err);

    if (!nodes)
    {
      if (err[0])
      {
        char *ts = indi_tstamp(NULL);
        fprintf (stderr, "%s: Driver %s: XML error: %s\n", ts, dp->name, err);
        fprintf (stderr, "%s: Driver %s: XML read: %.*s\n", ts,  dp->name, (int)nr, buf);
        shutdownDvr (dp, 1);
        return (-1);
      }
      return -1;
    }

    root=nodes[inode];
    while (root)
    {
        char *roottag = tagXMLEle(root);
        const char *dev = findXMLAttValu (root, "device");
        const char *name = findXMLAttValu (root, "name");
        int isblob = !strcmp (tagXMLEle(root), "setBLOBVector");
        Msg *mp;

        if (verbose > 2)
        {
            fprintf(stderr, "%s: Driver %s: read ", indi_tstamp(0),dp->name);
            traceMsg (root);
        } else if (verbose > 1)
        {
                fprintf (stderr, "%s: Driver %s: read <%s device='%s' name='%s'>\n", indi_tstamp(NULL), dp->name, tagXMLEle(root),
                         findXMLAttValu (root, "device"),
                         findXMLAttValu (root, "name"));
        }

      /* that's all if driver is just registering a snoop */
      /* JM 2016-05-18: Send getProperties to upstream chained servers as well.*/
      if (!strcmp (roottag, "getProperties"))
      {
          addSDevice (dp, dev, name);
          mp = newMsg();
          /* send to interested chained servers upstream */
          if (q2Servers(NULL, mp, root) < 0)
              shutany++;
          if (mp->count > 0)
              setMsgXMLEle (mp, root);
          else
              freeMsg (mp);
          delXMLEle (root);
          inode++; root=nodes[inode];
          continue;
      }

      /* that's all if driver desires to snoop BLOBs from other drivers */
      if (!strcmp (roottag, "enableBLOB"))
      {
          Property *sp = findSDevice (dp, dev, name);
          if (sp)
              crackBLOB (pcdataXMLEle (root), &sp->blob);
          delXMLEle (root);
          inode++; root=nodes[inode];
          continue;
      }

      /* Found a new device? Let's add it to driver info */
      if (dev[0] && isDeviceInDriver(dev, dp) == 0)
        {
	  dp->dev = (char **) realloc(dp->dev, (dp->ndev+1) * sizeof(char *));
	  dp->dev[dp->ndev] = (char *) malloc(MAXINDIDEVICE * sizeof(char));
	  
	  strncpy (dp->dev[dp->ndev], dev, MAXINDIDEVICE-1);
	  dp->dev[dp->ndev][MAXINDIDEVICE-1] = '\0';
	  
#ifdef OSX_EMBEDED_MODE
	  if (!dp->ndev)
	    fprintf(stderr, "STARTED \"%s\"\n", dp->name); fflush(stderr);
#endif
	  
	  dp->ndev++;
        }

      /* log messages if any and wanted */
      if (ldir)
	logDMsg (root, dev);
      
      /* build a new message -- set content iff anyone cares */
      mp = newMsg();
      
      /* send to interested clients */
      if (q2Clients (NULL, isblob, dev, name, mp, root) < 0)
	shutany++;
      
      /* send to snooping drivers */
      q2SDrivers (isblob, dev, name, mp, root);
      
      /* set message content if anyone cares else forget it */
      if (mp->count > 0)
	setMsgXMLEle (mp, root);
      else
	freeMsg (mp);
      delXMLEle (root);
      inode++; root=nodes[inode];
    }

    free(nodes);

    return (shutany ? -1 : 0);
}

/* read more from the given driver stderr, add prefix and send to our stderr.
 * return 0 if ok else -1 if had to restart.
 */
static int
stderrFromDriver (DvrInfo *dp)
{
    static char exbuf[MAXRBUF];
    static int nexbuf;
    ssize_t i, nr;

    /* read more */
    nr = read (dp->efd, exbuf+nexbuf, sizeof(exbuf)-nexbuf);
    if (nr <= 0) {
        if (nr < 0)
        fprintf (stderr, "%s: Driver %s: stderr %s\n", indi_tstamp(NULL),
                            dp->name, strerror(errno));
        else
        fprintf (stderr, "%s: Driver %s: stderr EOF\n",
                            indi_tstamp(NULL), dp->name);
            shutdownDvr (dp, 1);
        return (-1);
    }
    nexbuf += nr;

    /* prefix each whole line to our stderr, save extra for next time */
    for (i = 0; i < nexbuf; i++) {
        if (exbuf[i] == '\n') {
        fprintf (stderr, "%s: Driver %s: %.*s\n", indi_tstamp(NULL),
                                dp->name, (int)i, exbuf);
        i++;				  /* count including nl */
        nexbuf -= i;			  /* remove from nexbuf */
        memmove (exbuf, exbuf+i, nexbuf); /* slide remaining to front */
        i = -1;				  /* restart for loop scan */
        }
    }

    return (0);
}

/* close down the given client */
static void
shutdownClient (ClInfo *cp)
{
    Msg *mp;

    /* close connection */
    shutdown (cp->s, SHUT_RDWR);
    close (cp->s);

    /* free memory */
    delLilXML (cp->lp);
    free (cp->props);

    /* decrement and possibly free any unsent messages for this client */
    while ((mp = (Msg*) popFQ(cp->msgq)) != NULL)
        if (--mp->count == 0)
        freeMsg (mp);
    delFQ (cp->msgq);

    /* ok now to recycle */
    cp->active = 0;

    if (verbose > 0)
        fprintf (stderr, "%s: Client %d: shut down complete - bye!\n",
                            indi_tstamp(NULL), cp->s);
#ifdef OSX_EMBEDED_MODE
  int active = 0;
  for (int i = 0; i < nclinfo; i++)
    if (clinfo[i].active)
      active++;
  fprintf(stderr, "CLIENTS %d\n", active); fflush(stderr);
#endif
}

/* close down the given driver and restart */
static void
shutdownDvr (DvrInfo *dp, int restart)
{
    Msg *mp;

    /* make sure it's dead, reclaim resources */
    if (dp->pid == REMOTEDVR) {
        /* socket connection */
        shutdown (dp->wfd, SHUT_RDWR);
        close (dp->wfd);	/* same as rfd */
    } else {
        /* local pipe connection */
            kill (dp->pid, SIGKILL);	/* we've insured there are no zombies */
        close (dp->wfd);
        close (dp->rfd);
        close (dp->efd);
    }

#ifdef OSX_EMBEDED_MODE
  fprintf(stderr, "STOPPED \"%s\"\n", dp->name); fflush(stderr);
#endif

    /* free memory */
    free (dp->sprops);
    free(dp->dev);
    delLilXML (dp->lp);

   /* ok now to recycle */
   dp->active = 0;
   dp->ndev = 0;

    /* decrement and possibly free any unsent messages for this client */
    while ((mp = (Msg*) popFQ(dp->msgq)) != NULL)
        if (--mp->count == 0)
        freeMsg (mp);
    delFQ (dp->msgq);

        if (restart)
        {
            if (dp->restarts >= maxrestarts)
            {
                fprintf (stderr, "%s: Driver %s: Terminated after #%d restarts.\n", indi_tstamp(NULL), dp->name, dp->restarts);
                // If we're not in FIFO mode and we do not have any more drivers, shutdown the server
                terminateddrv++;
                if ((ndvrinfo-terminateddrv) <= 0 && !fifo.name)
                    Bye();
            }
            else
            {
                fprintf (stderr, "%s: Driver %s: restart #%d\n", indi_tstamp(NULL), dp->name, ++dp->restarts);
                startDvr (dp);
            }
        }
}

/* put Msg mp on queue of each driver responsible for dev, or all drivers
 * if dev not specified.
 */
static void
q2RDrivers (const char *dev, Msg *mp, XMLEle *root)
{
    int sawremote = 0;
    DvrInfo *dp;
    char *roottag = tagXMLEle(root);

    /* queue message to each interested driver.
     * N.B. don't send generic getProps to more than one remote driver,
     *   otherwise they all fan out and we get multiple responses back.
     */
    for (dp = dvrinfo; dp < &dvrinfo[ndvrinfo]; dp++)
    {
        int isremote = (dp->pid == REMOTEDVR);

        if (dp->active == 0)
            continue;

        /* driver known to not support this dev */
        if (dev[0] && isDeviceInDriver(dev, dp) == 0)
            continue;

        /* already sent generic to another remote */
        if (!dev[0] && isremote && sawremote)
            continue;

        /* JM 2016-10-30: Only send enableBLOB to remote drivers */
        if (isremote == 0 && !strcmp(roottag, "enableBLOB"))
            continue;

        if (isremote)
            sawremote = 1;

        /* ok: queue message to this driver */
        mp->count++;
        pushFQ (dp->msgq, mp);
        if (verbose > 1)
        {
            fprintf (stderr, "%s: Driver %s: queuing responsible for <%s device='%s' name='%s'>\n",
                     indi_tstamp(NULL), dp->name, tagXMLEle(root),
                     findXMLAttValu (root, "device"),
                     findXMLAttValu (root, "name"));
        }
    }
}

/* put Msg mp on queue of each driver snooping dev/name.
 * if BLOB always honor current mode.
 */
static void
q2SDrivers (int isblob, const char *dev, const char *name, Msg *mp, XMLEle *root)
{
    DvrInfo *dp;

    for (dp = dvrinfo; dp < &dvrinfo[ndvrinfo]; dp++) {
            Property *sp = findSDevice (dp, dev, name);

        /* nothing for dp if not snooping for dev/name or wrong BLOB mode */
        if (!sp)
        continue;
        if ((isblob && sp->blob==B_NEVER) || (!isblob && sp->blob==B_ONLY))
        continue;

        /* ok: queue message to this device */
        mp->count++;
        pushFQ (dp->msgq, mp);
        if (verbose > 1) {
        fprintf (stderr, "%s: Driver %s: queuing snooped <%s device='%s' name='%s'>\n",
                    indi_tstamp(NULL), dp->name, tagXMLEle(root),
                    findXMLAttValu (root, "device"),
                    findXMLAttValu (root, "name"));
        }
    }
}

/* add dev/name to dp's snooping list.
 * init with blob mode set to B_NEVER.
 */
static void
addSDevice (DvrInfo *dp, const char *dev, const char *name)
{
        Property *sp;
    char *ip;

    /* no dups */
    sp = findSDevice (dp, dev, name);
    if (sp)
        return;

    /* add dev to sdevs list */
    dp->sprops = (Property*) realloc (dp->sprops,
                                            (dp->nsprops+1)*sizeof(Property));
    sp = &dp->sprops[dp->nsprops++];

    ip = sp->dev;
    strncpy (ip, dev, MAXINDIDEVICE-1);
    ip[MAXINDIDEVICE-1] = '\0';

    ip = sp->name;
    strncpy (ip, name, MAXINDINAME-1);
    ip[MAXINDINAME-1] = '\0';

    sp->blob = B_NEVER;

    if (verbose)
        fprintf (stderr, "%s: Driver %s: snooping on %s.%s\n", indi_tstamp(NULL),
                            dp->name, dev, name);
}

/* return Property if dp is snooping dev/name, else NULL.
 */
static Property *
findSDevice (DvrInfo *dp, const char *dev, const char *name)
{
    int i;

    for (i = 0; i < dp->nsprops; i++) {
            Property *sp = &dp->sprops[i];
            if (!strcmp (sp->dev, dev) &&
                    (!sp->name[0] || !strcmp(sp->name, name)))
        return (sp);
    }

    return (NULL);
}


/* put Msg mp on queue of each client interested in dev/name, except notme.
 * if BLOB always honor current mode.
 * return -1 if had to shut down any clients, else 0.
 */
static int
q2Clients (ClInfo *notme, int isblob, const char *dev, const char *name, Msg *mp, XMLEle *root)
{
    int shutany = 0;
    ClInfo *cp;
    int ql,i=0;

    /* queue message to each interested client */
    for (cp = clinfo; cp < &clinfo[nclinfo]; cp++) {
        /* cp in use? notme? want this dev/name? blob? */
        if (!cp->active || cp == notme)
        continue;
            if (findClDevice (cp, dev, name) < 0)
        continue;

            //if ((isblob && cp->blob==B_NEVER) || (!isblob && cp->blob==B_ONLY))
            if (!isblob && cp->blob==B_ONLY)
                continue;

            if (isblob)
            {
                if (cp->nprops > 0)
                {
                Property *pp = NULL;
                int blob_found=0;
                for (i = 0; i < cp->nprops; i++)
                {
                    pp = &cp->props[i];
                    if (!strcmp (pp->dev, dev) && (!strcmp(pp->name, name)))
                    {
                        blob_found = 1;
                        break;
                    }
                }

                if ( (blob_found && pp->blob == B_NEVER) || (blob_found==0 && cp->blob == B_NEVER) )
                    continue;
               }
               else if (cp->blob == B_NEVER)
                   continue;
           }

        /* shut down this client if its q is already too large */
        ql = msgQSize(cp->msgq);
        if (ql > maxqsiz) {
        if (verbose)
            fprintf (stderr, "%s: Client %d: %d bytes behind, shutting down\n",
                            indi_tstamp(NULL), cp->s, ql);
        shutdownClient (cp);
        shutany++;
        continue;
        }

        /* ok: queue message to this client */
        mp->count++;
        pushFQ (cp->msgq, mp);
        if (verbose > 1)
        fprintf (stderr, "%s: Client %d: queuing <%s device='%s' name='%s'>\n",
                    indi_tstamp(NULL), cp->s, tagXMLEle(root),
                    findXMLAttValu (root, "device"),
                    findXMLAttValu (root, "name"));
    }

    return (shutany ? -1 : 0);
}

/* put Msg mp on queue of each chained server client, except notme.
  * return -1 if had to shut down any clients, else 0.
 */
static int
q2Servers (ClInfo *notme, Msg *mp, XMLEle *root)
{
    int shutany = 0;
    ClInfo *cp;
    int ql=0;

    /* queue message to each interested client */
    for (cp = clinfo; cp < &clinfo[nclinfo]; cp++)
    {
        /* cp in use? notme? chained server? */
        if (!cp->active || cp == notme || cp->allprops == 1)
            continue;

        /* shut down this client if its q is already too large */
        ql = msgQSize(cp->msgq);
        if (ql > maxqsiz)
        {
        if (verbose)
            fprintf (stderr, "%s: Client %d: %d bytes behind, shutting down\n",
                            indi_tstamp(NULL), cp->s, ql);
        shutdownClient (cp);
        shutany++;
        continue;
        }

        /* ok: queue message to this client */
        mp->count++;
        pushFQ (cp->msgq, mp);
        if (verbose > 1)
        fprintf (stderr, "%s: Client %d: queuing <%s device='%s' name='%s'>\n",
                    indi_tstamp(NULL), cp->s, tagXMLEle(root),
                    findXMLAttValu (root, "device"),
                    findXMLAttValu (root, "name"));
    }

    return (shutany ? -1 : 0);
}

/* return size of all Msqs on the given q */
static int
msgQSize (FQ *q)
{
    int i, l = 0;

    for (i = 0; i < nFQ(q); i++) {
        Msg *mp = (Msg *) peekiFQ(q,i);
        l += mp->cl;
    }

    return (l);
}

/* print root as content in Msg mp.
 */
static void
setMsgXMLEle (Msg *mp, XMLEle *root)
{
    /* want cl to only count content, but need room for final \0 */
    mp->cl = sprlXMLEle (root, 0);
    if (mp->cl < sizeof(mp->buf))
        mp->cp = mp->buf;
    else
        mp->cp = malloc (mp->cl+1);
    sprXMLEle (mp->cp, root, 0);
}

/* save str as content in Msg mp.
 */
static void
setMsgStr (Msg *mp, char *str)
{
    /* want cl to only count content, but need room for final \0 */
    mp->cl = strlen (str);
    if (mp->cl < sizeof(mp->buf))
        mp->cp = mp->buf;
    else
        mp->cp = malloc (mp->cl+1);
    strcpy (mp->cp, str);
}

/* return pointer to one new nulled Msg
 */
static Msg *
newMsg (void)
{
    return ((Msg *) calloc (1, sizeof(Msg)));
}

/* free Msg mp and everything it contains */
static void
freeMsg (Msg *mp)
{
    if (mp->cp && mp->cp != mp->buf)
        free (mp->cp);
    free (mp);
}

/* write the next chunk of the current message in the queue to the given
 * client. pop message from queue when complete and free the message if we are
 * the last one to use it. shut down this client if trouble.
 * N.B. we assume we will never be called with cp->msgq empty.
 * return 0 if ok else -1 if had to shut down.
 */
static int
sendClientMsg (ClInfo *cp)
{
    ssize_t nsend, nw;
    Msg *mp;

    /* get current message */
    mp = (Msg *) peekFQ (cp->msgq);

    /* send next chunk, never more than MAXWSIZ to reduce blocking */
    nsend = mp->cl - cp->nsent;
    if (nsend > MAXWSIZ)
        nsend = MAXWSIZ;
    nw = write (cp->s, &mp->cp[cp->nsent], nsend);

    /* shut down if trouble */
    if (nw <= 0) {
        if (nw == 0)
        fprintf (stderr, "%s: Client %d: write returned 0\n",
                            indi_tstamp(NULL), cp->s);
        else
        fprintf (stderr, "%s: Client %d: write: %s\n", indi_tstamp(NULL),
                            cp->s, strerror(errno));
        shutdownClient (cp);
        return (-1);
    }

    /* trace */
    if (verbose > 2) {
        fprintf(stderr, "%s: Client %d: sending msg copy %d nq %d:\n%.*s\n",
                indi_tstamp(NULL), cp->s, mp->count, nFQ(cp->msgq),
                (int)nw, &mp->cp[cp->nsent]);
    } else if (verbose > 1) {
        fprintf(stderr, "%s: Client %d: sending %.50s\n", indi_tstamp(NULL),
                            cp->s, &mp->cp[cp->nsent]);
    }

    /* update amount sent. when complete: free message if we are the last
     * to use it and pop from our queue.
     */
    cp->nsent += nw;
    if (cp->nsent == mp->cl) {
        if (--mp->count == 0)
        freeMsg (mp);
        popFQ (cp->msgq);
        cp->nsent = 0;
    }

    return (0);
}

/* write the next chunk of the current message in the queue to the given
 * driver. pop message from queue when complete and free the message if we are
 * the last one to use it. restart this driver if touble.
 * N.B. we assume we will never be called with dp->msgq empty.
 * return 0 if ok else -1 if had to shut down.
 */
static int
sendDriverMsg (DvrInfo *dp)
{
    ssize_t nsend, nw;
    Msg *mp;

    /* get current message */
    mp = (Msg *) peekFQ (dp->msgq);

    /* send next chunk, never more than MAXWSIZ to reduce blocking */
    nsend = mp->cl - dp->nsent;
    if (nsend > MAXWSIZ)
        nsend = MAXWSIZ;
    nw = write (dp->wfd, &mp->cp[dp->nsent], nsend);

    /* restart if trouble */
    if (nw <= 0) {
        if (nw == 0)
        fprintf (stderr, "%s: Driver %s: write returned 0\n",
                            indi_tstamp(NULL), dp->name);
        else
        fprintf (stderr, "%s: Driver %s: write: %s\n", indi_tstamp(NULL),
                            dp->name, strerror(errno));
            shutdownDvr (dp, 1);
        return (-1);
    }

    /* trace */
    if (verbose > 2) {
        fprintf(stderr, "%s: Driver %s: sending msg copy %d nq %d:\n%.*s\n",
                indi_tstamp(NULL), dp->name, mp->count, nFQ(dp->msgq),
                (int)nw, &mp->cp[dp->nsent]);
    } else if (verbose > 1) {
        fprintf(stderr, "%s: Driver %s: sending %.50s\n", indi_tstamp(NULL),
                        dp->name, &mp->cp[dp->nsent]);
    }

    /* update amount sent. when complete: free message if we are the last
     * to use it and pop from our queue.
     */
    dp->nsent += nw;
    if (dp->nsent == mp->cl) {
        if (--mp->count == 0)
        freeMsg (mp);
        popFQ (dp->msgq);
        dp->nsent = 0;
    }

    return (0);
}

/* return 0 if cp may be interested in dev/name else -1
 */
static int
findClDevice (ClInfo *cp, const char *dev, const char *name)
{
    int i;

        if (cp->allprops || !dev[0])
        return (0);
        for (i = 0; i < cp->nprops; i++)
        {
            Property *pp = &cp->props[i];
            if (!strcmp (pp->dev, dev) && (!pp->name[0] || !strcmp(pp->name, name)))
        return (0);
    }
    return (-1);
}

/* add the given device and property to the devs[] list of client if new.
 */
static void
addClDevice (ClInfo *cp, const char *dev, const char *name, int isblob)
{
    Property *pp;
    //char *ip;
        int i=0;

        if (isblob)
        {
            for (i = 0; i < cp->nprops; i++)
            {
                Property *pp = &cp->props[i];
                if (!strcmp (pp->dev, dev) && (name==NULL || !strcmp(pp->name, name)))
                    return;
            }
        }
    /* no dups */
        else if (!findClDevice (cp, dev, name))
        return;

    /* add */
    cp->props = (Property *) realloc (cp->props,
                                            (cp->nprops+1)*sizeof(Property));
    pp = &cp->props[cp->nprops++];

        /*ip = pp->dev;
    strncpy (ip, dev, MAXINDIDEVICE-1);
    ip[MAXINDIDEVICE-1] = '\0';

    ip = pp->name;
    strncpy (ip, name, MAXINDINAME-1);
        ip[MAXINDINAME-1] = '\0';*/

        strncpy (pp->dev, dev, MAXINDIDEVICE);
        strncpy (pp->name, name, MAXINDINAME);
        pp->blob = B_NEVER;
}


/* block to accept a new client arriving on lsocket.
 * return private nonblocking socket or exit.
 */
static int
newClSocket ()
{
    struct sockaddr_in cli_socket;
    socklen_t cli_len;
    int cli_fd;

    /* get a private connection to new client */
    cli_len = sizeof(cli_socket);
    cli_fd = accept (lsocket, (struct sockaddr *)&cli_socket, &cli_len);
    if(cli_fd < 0) {
        fprintf (stderr, "accept: %s\n", strerror(errno));
        Bye();
    }

    /* ok */
    return (cli_fd);
}

/* convert the string value of enableBLOB to our B_ state value.
 * no change if unrecognized
 */
static void
crackBLOB (const char *enableBLOB, BLOBHandling *bp)
{
    if (!strcmp (enableBLOB, "Also"))
        *bp = B_ALSO;
    else if (!strcmp (enableBLOB, "Only"))
        *bp = B_ONLY;
    else if (!strcmp (enableBLOB, "Never"))
        *bp = B_NEVER;
}

/* Update the client property BLOB handling policy */
static void crackBLOBHandling(const char *dev, const char *name, const char *enableBLOB, ClInfo *cp)
{
    int i=0;

    /* If we have EnableBLOB with property name, we add it to Client device list */
    if (name[0])
        addClDevice (cp, dev, name, 1);
    else
    /* Otherwise, we set the whole client blob handling to what's passed (enableBLOB) */
        crackBLOB(enableBLOB, &cp->blob);

    /* If whole client blob handling policy was updated, we need to pass that also to all children
       and if the request was for a specific property, then we apply the policy to it */
    for (i = 0; i < cp->nprops; i++)
    {
        Property *pp = &cp->props[i];
        if (!name[0])
            crackBLOB(enableBLOB, &pp->blob);
        else if (!strcmp (pp->dev, dev) && (!strcmp(pp->name, name)))
        {
            crackBLOB(enableBLOB, &pp->blob);
            return;
        }
    }
}

/* print key attributes and values of the given xml to stderr.
 */
static void
traceMsg (XMLEle *root)
{
    static const char *prtags[] = {
        "defNumber", "oneNumber",
        "defText",   "oneText",
        "defSwitch", "oneSwitch",
        "defLight",  "oneLight",
    };
    XMLEle *e;
    const char *msg, *perm, *pcd;
    unsigned int i;

    /* print tag header */
    fprintf (stderr, "%s %s %s %s", tagXMLEle(root),
                        findXMLAttValu(root,"device"),
                        findXMLAttValu(root,"name"),
                        findXMLAttValu(root,"state"));
    pcd = pcdataXMLEle (root);
    if (pcd[0])
        fprintf (stderr, " %s", pcd);
    perm = findXMLAttValu(root,"perm");
    if (perm[0])
        fprintf (stderr, " %s", perm);
    msg = findXMLAttValu(root,"message");
    if (msg[0])
        fprintf (stderr, " '%s'", msg);

    /* print each array value */
    for (e = nextXMLEle(root,1); e; e = nextXMLEle(root,0))
        for (i = 0; i < sizeof(prtags)/sizeof(prtags[0]); i++)
        if (strcmp (prtags[i], tagXMLEle(e)) == 0)
            fprintf (stderr, "\n %10s='%s'", findXMLAttValu(e,"name"),
                                pcdataXMLEle (e));

    fprintf (stderr, "\n");
}

/* fill s with current UT string.
 * if no s, use a static buffer
 * return s or buffer.
 * N.B. if use our buffer, be sure to use before calling again
 */
static char *
indi_tstamp (char *s)
{
    static char sbuf[64];
    struct tm *tp;
    time_t t;

    time (&t);
    tp = gmtime (&t);
    if (!s)
        s = sbuf;
    strftime (s, sizeof(sbuf), "%Y-%m-%dT%H:%M:%S", tp);
    return (s);
}

/* log message in root known to be from device dev to ldir, if any.
 */
static void
logDMsg (XMLEle *root, const char *dev)
{
        char stamp[64];
        char logfn[1024];
        const char *ts, *ms;
        FILE *fp;

        /* get message, if any */
        ms = findXMLAttValu (root, "message");
        if (!ms[0])
            return;

        /* get timestamp now if not provided */
        ts = findXMLAttValu (root, "timestamp");
        if (!ts[0])
        {
            indi_tstamp (stamp);
            ts = stamp;
        }

        /* append to log file, name is date portion of time stamp */
        sprintf (logfn, "%s/%.10s.islog", ldir, ts);
        fp = fopen (logfn, "a");
        if (!fp)
            return;	/* oh well */
        fprintf (fp, "%s: %s: %s\n", ts, dev, ms);
        fclose (fp);
}

/* log when then exit */
static void
Bye()
{
    fprintf (stderr, "%s: good bye\n", indi_tstamp(NULL));
    exit(1);
}

