/*
  *  Copyright (C) 2002 - 2004 Tomasz Kojm <tkojm@clamav.net>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program 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 General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 

 #if HAVE_CONFIG_H
 #include "clamav-config.h"
 #endif
 

 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/socket.h>

 #include <sys/time.h>

 #include <pthread.h>
 #include <time.h>
 #include <signal.h>

 #include <errno.h>

 #include "cfgparser.h"

 #include "others.h"
 #include "defaults.h"
 #include "scanner.h"
 #include "server.h"
 #include "clamuko.h"
 #include "tests.h"
 #include "session.h"

 #include "str.h" /* libclamav */

 #include "clamav.h"

 #include "output.h"

 #include "memory.h"

 
 #define CMD1 "SCAN"
 #define CMD2 "RAWSCAN"
 #define CMD3 "QUIT" /* deprecated */
 #define CMD4 "RELOAD"
 #define CMD5 "PING"
 #define CMD6 "CONTSCAN"
 #define CMD7 "VERSION"
 #define CMD8 "STREAM"
 #define CMD9 "SESSION"
 #define CMD10 "END"
 #define CMD11 "SHUTDOWN"
 

 pthread_mutex_t ctime_mutex = PTHREAD_MUTEX_INITIALIZER;

 int command(int desc, const struct cl_node *root, const struct cl_limits *limits, int options, const struct cfgstruct *copt, int timeout)

 {
 	char buff[1025];

 	int bread, opt, ret, retval;

 	struct cfgstruct *cpt;

     retval = poll_fd(desc, timeout);

     switch (retval) {
     case 0: /* timeout */
 	mdprintf(desc, "ERROR\n");
 	logg("!Command: command timeout.\n");
 	return -1;
     case -1:
 	mdprintf(desc, "ERROR\n");
 	logg("!Command: poll_fd failed.\n");
 	return -1;

     }

     while((bread = read(desc, buff, 1024)) == -1 && errno == EINTR);
 

     if(!bread)
 	return 0;
 
     if(bread < 0) {

 	logg("!Command parser: read() failed.\n");
 	/* at least try to display this error message */

 	/* mdprintf(desc, "ERROR: Command parser: read() failed.\n"); */

 	return -1;
     }
 
     buff[bread] = 0;

     cli_chomp(buff);

 
     if(!strncmp(buff, CMD1, strlen(CMD1))) { /* SCAN */
 	scan(buff + strlen(CMD1) + 1, NULL, root, limits, options, copt, desc, 0);
 
     } else if(!strncmp(buff, CMD2, strlen(CMD2))) { /* RAWSCAN */

 	opt = options & ~CL_SCAN_ARCHIVE;

 	scan(buff + strlen(CMD2) + 1, NULL, root, NULL, opt, copt, desc, 0);
 
     } else if(!strncmp(buff, CMD3, strlen(CMD3))) { /* QUIT */

 	return COMMAND_SHUTDOWN;

 
     } else if(!strncmp(buff, CMD4, strlen(CMD4))) { /* RELOAD */
 	mdprintf(desc, "RELOADING\n");
 	return COMMAND_RELOAD;
 
     } else if(!strncmp(buff, CMD5, strlen(CMD5))) { /* PING */
 	mdprintf(desc, "PONG\n");
 
     } else if(!strncmp(buff, CMD6, strlen(CMD6))) { /* CONTSCAN */
 	scan(buff + strlen(CMD6) + 1, NULL, root, limits, options, copt, desc, 1);
 
     } else if(!strncmp(buff, CMD7, strlen(CMD7))) { /* VERSION */

 	    const char *dbdir;
 	    char *path;
 	    struct cl_cvd *daily;
 
 	if((cpt = cfgopt(copt, "DatabaseDirectory")) || (cpt = cfgopt(copt, "DataDirectory")))
 	    dbdir = cpt->strarg;
 	else
 	    dbdir = cl_retdbdir();
 
 	if(!(path = mmalloc(strlen(dbdir) + 11))) {
 	    mdprintf(desc, "Memory allocation error - SHUTDOWN forced\n");
 	    return COMMAND_SHUTDOWN;
 	}
 
 	sprintf(path, "%s/daily.cvd", dbdir);
 
 	if((daily = cl_cvdhead(path))) {
 		time_t t = (time_t) daily->stime;
 
 	    pthread_mutex_lock(&ctime_mutex);
 	    mdprintf(desc, "ClamAV "VERSION"/%d/%s", daily->version, ctime(&t));
 	    pthread_mutex_unlock(&ctime_mutex);
 	    cl_cvdfree(daily);
 	} else {
 	    mdprintf(desc, "ClamAV "VERSION"\n");
 	}
 
 	free(path);

 
     } else if(!strncmp(buff, CMD8, strlen(CMD8))) { /* STREAM */
 	scanstream(desc, NULL, root, limits, options, copt);
 
     } else if(!strncmp(buff, CMD9, strlen(CMD9))) { /* SESSION */
 	do {

 	    if(!is_fd_connected(desc)) {

 		logg("SESSION: Client disconnected without END\n");

 		return 0;
 	    }
 	    ret = command(desc, root, limits, options, copt, -1);

 	} while(!ret);
 
 	switch(ret) {

 	    case COMMAND_SHUTDOWN:

 		mdprintf(desc, "SESSION TERMINATED (SHUTDOWN)\n");
 		break;
 
 	    case COMMAND_RELOAD:
 		mdprintf(desc, "SESSION TERMINATED (DATABASE RELOADING)\n");
 		break;
 
 	    case COMMAND_END:
 		mdprintf(desc, "BYE\n");
 		break;
 
 	    default:
 		mdprintf(desc, "SESSION TERMINATED (INTERNAL ERROR)\n");
 		break;
 	}
 
 	return ret;
 
     } else if(!strncmp(buff, CMD10, strlen(CMD10))) { /* END */
 	return COMMAND_END;
 
     } else if(!strncmp(buff, CMD11, strlen(CMD11))) { /* SHUTDOWN */

 	return COMMAND_SHUTDOWN;

 
     } else {
 	mdprintf(desc, "UNKNOWN COMMAND\n");
     }
 
     return 0; /* no error and no 'special' command executed */
 }