File: main.c

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/*
 * $Id: main.c,v 1.3 1998/08/15 00:00:50 elkner Exp $
 *
 * Author:  Squirm derived       http://www.senet.com.au/squirm/
 * Project: Jesred       http://ivs.cs.uni-magdeburg.de/~elkner/webtools/jesred/
 *
 * 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.
 *
 * http://www.gnu.org/copyleft/gpl.html or ./gpl.html
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#include<stdio.h>
#include<stdlib.h>
#include <unistd.h>
#include<string.h>
#include<sys/signal.h>
#include<sys/types.h>
#include<netinet/in.h>
#include<arpa/inet.h>

#ifdef LINUX
#include <unistd.h>
#endif

#ifdef LOCAL_REGEX
#include "regex.h"
#else
#include<regex.h>
#endif

#include "main.h"
#include "ip_list.h"
#include "pattern_list.h"
#include "config.h"
#include "util.h"
#include "log.h"
#include "version.h"
#include "rewrite.h"

extern int pattern_compare();	/* from rewrite.c */

static void Usage (void);
static void GetOptions(int argc, char *argv[]);

int echo_mode = 0;
int sig_hup = 0;
int interactive = 0;
int allow_siblings = 0;
#ifdef DEBUG
int debug_mode = 0;
#endif
FILE *fd_redirect = NULL;
FILE *fd_rewrite = NULL;


int main(int argc, char **argv)
{
    char *f_allow = NULL;
    char *f_rules = NULL;
    char *f_rewrite = NULL;
    char *f_redirect = NULL;


/*    int first_run = 1; */
    char buff[BUFSIZE];
    char redirect_url[BUFSIZE];
    char *url, *src_addr, *ident, *method, *urlgroup = "";
    int finished = 0;
    int buff_status = 0;
    ip_acl *ip_list = NULL;
    pattern_item *pattern_list = NULL;
    
    /* go into interactive mode if we're run as root */
    if((int)getuid() == 0) {
	interactive = 1;
	fprintf(stderr, "%s running as UID 0: writing logs to stderr\n",APPNAME);
    }
    signal(SIGHUP, HUPhandler);
    signal(SIGKILL, KILLhandler);
    GetOptions(argc, argv);

    /* main program loop, executed  forever more unless terminated
       by a kill signal or EOF on stdin */
    while(! finished) {
       int val, chanid;
	
	sig_hup = 0;
	mylog(INFO, "Freeing up old linked lists\n");
	ip_acl_destroy(&ip_list);
	plist_destroy(&pattern_list);
	closeLogs();
	read_config(&f_allow, &f_rules, &f_redirect, &f_rewrite);
	if (! interactive)
	    openLogs(&f_redirect, &f_rewrite);
	read_allow(&f_allow, &ip_list);
	read_rules(&f_rules, &pattern_list);
	
	if(echo_mode)
	    mylog(ERROR, "Invalid condition - continuing in ECHO mode\n");
	mylog(INFO, "%s (PID %d) started\n", APPNAME, (int)getpid());
	
	while((!sig_hup) && (fgets(buff, BUFSIZE, stdin) != NULL)){
	    if(echo_mode) {	/* this doesn't work if a channel-id is present. */
	       printf("ERR\n");
	       fflush(stdout);
	       continue;
	    }
	    /* separate the fields from the single input line of stdin */
	    buff_status = parse_buff(buff, &url, &src_addr, &ident, &method,
				     &chanid, ip_list);
	    /* error during parsing the passed line from squid - no rewrite */
	    if(buff_status) {
	       if (chanid != -1)
		  printf("%d ",chanid);
	       printf("ERR\n");
	       fflush(stdout);
	       continue;
	    }
	    /* check echo_mode again (sighup)*/
	    if(echo_mode) {
	       if (chanid != -1)
		  printf("%d ",chanid);
	       printf("ERR\n");
	       fflush(stdout);
	       mylog(ERROR, "Invalid condition - continuing in ECHO mode\n");
	       continue;
	    }
	    /* find a rule for rewriting the URL */
	    val = pattern_compare(url, urlgroup, redirect_url, pattern_list);
	    if( val < 1 )
	    {
	       /* no rule found = 0, or ABORT rule -N */
	       if (chanid != -1)
		  printf("%d ", chanid);
	       printf("OK\n");
	       fflush(stdout);
	       continue;
	    }
	    else
	    {
	       /* redirect_url contains the replacement URL */
	       if ( redirect_url[0] == '\0' ) {
		  /* regex[i] abort, i.e. empty replacement URL */
		  if (chanid != -1)
		     printf("%d ", chanid);
		  printf("OK\n");
		  fflush(stdout);
	       }
	       else
	       {
		  int code;
		  char *just_url;

		  if (chanid != -1)
		     printf("%d ", chanid);

		  /* az [2015-10-23 Fri 23:19]
		     squid3.4 and 3.5 no longer support the 30X:url format,
		     at least according to SOME of the very inconsistent docs.

		     the protocol helper descripton page
		     http://wiki.squid-cache.org/Features/AddonHelpers
		     makes little sense; the protocol it describes is not at
		     all what the url_rewrite_program describes.
		     so i'll take a guess :-(

		     the tool should provide a very different response
		     for these...the sscanf isn't very efficient, but
		     i can't be bothered rewriting the rules parser
		     to support a separate code field...
		  */
		  if (2 == sscanf(redirect_url, "%d:%ms", &code, &just_url))
		  {
		     printf("OK code=%d url=%s\n", code, just_url);
		     free(just_url);
		  }
		  else
		     printf("OK rewrite-url=%s\n", redirect_url);
		  fflush(stdout);
		  mylog(MATCH, "%s %s %s %d\n", src_addr, url, redirect_url,
			val);
	       }
	    }
	}
	if(! sig_hup)
	    finished = 1;
    } /* end while(1) */
    ip_acl_destroy(&ip_list);
    plist_destroy(&pattern_list);
    closeLogs();
    safe_free(f_rewrite);
    safe_free(f_redirect);
    return 0;
}

static void
GetOptions(int argc, char *argv[])
{
    extern char *optarg;
    extern int optind;
    int c;
    
    while ((c = getopt(argc, argv, "hv")) != -1) {
        switch (c) {
	    case 'h' :
		Usage();
		break;
            case 'v' :
                printf("%s %s  (C) by %s  (%s)\n%s\n",
                       APPNAME, VERSION, AUTHOR, AUTHOR_EMAIL, APPURL);
		exit(0);
            default:
                Usage();
                break;
	}
    }
}

static void
Usage(void)
{
    
    fprintf(stderr,
            "Usage: %s [-h] [-v]\n\n"
            "   -h         print this and exit\n"
            "   -v         show version and exit\n",
            APPNAME);
    exit(1);
}