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/* siteexclude.c - check article id for excluded sites
*
* Copyright (C) 1995 Peter Fox <fox@roestock.demon.co.uk>
*
* This code may be freely copied in it's entirety, but the
* above notice may not be removed or altered without
* reference to the author.
* Individuals may make changes for their own use, however
* any changed copies may not be distributed without
* reference to the author.
* There isn't any guarantee of usefulness or efficacy for
* any particular purpose. Take it as it is.
*/
#include <stdio.h>
#include <string.h>
#include "syslog.h"
#include "conf.h"
#ifdef TEST
#define SITEEXCLUDING
#endif /*TEST*/
#ifdef SITEEXCLUDING
typedef struct slist
{
struct slist *next;
char *str;
} SLIST, *SLISTPTR;
#define HASHSIZE 256
#define HASHFN(x) (((x[1] & 15) << 4)|(x[2] & 15)) /* x is (char *), skip '@' */
#ifdef TEST
#define SITEFILE "./sites"
#define DROPFILE "./dropped"
#define log_msg printf
#define log_sys printf
#define debug_flag 1
#else /*!TEST*/
extern int debug_flag;
#ifndef SITEFILE
#define SITEFILE "/var/lib/news/excludesites"
#endif /*SITEFILE*/
#ifndef DROPFILE
#define DROPFILE "/var/lib/news/droppedarticles"
#endif /*DROPFILE*/
#endif /*TEST*/
SLIST hash[HASHSIZE];
static FILE *dropfp = (FILE*)0;
site_init()
{
int i;
FILE *fp;
char linbuf[BUFSIZ];
SLISTPTR ptr;
int entries, collisions;
entries = 0;
collisions = 0;
for(i = 0; i < HASHSIZE; i++)
{
hash[i].next = (SLISTPTR)0;
hash[i].str = (char *)0;
}
if(!(fp = fopen(SITEFILE, "r")))
{
log_msg("site_init: warning - no site exclude file %s", SITEFILE);
return;
}
if(!(dropfp = fopen(DROPFILE, "a")))
{
log_msg("site_init: warning - cannot open file %s for append, dropped articles logged instead", DROPFILE);
}
else
fprintf(dropfp, "-----\n");
/* File contains lines with complete site names to exclude */
/* We add the leading @ and trailing > */
linbuf[0] = '@';
while(1)
{
/* Read in a line */
(void) fgets(linbuf+1, sizeof (linbuf)-2, fp);
if(feof(fp))
break;
/* If a read error then report it and abort */
if (ferror(fp))
{
log_sys("site_init: error reading %s", SITEFILE);
break;
}
if(linbuf[1])
{
/* Kill the \n */
linbuf[strlen(linbuf)-1] = '>';
entries++;
ptr = &hash[HASHFN(linbuf)];
if(debug_flag)
fprintf(stderr, "'%s: %08lx'\n", linbuf, ptr);
if(!ptr->str)
ptr->str = strdup(linbuf);
else
{
/* Run along to the last in line */
while(ptr->next)
ptr = ptr->next;
ptr->next = (SLISTPTR)malloc(sizeof(SLIST));
ptr = ptr->next;
ptr->next = (SLISTPTR)0;
ptr->str = strdup(linbuf);
collisions++;
}
}
}
fclose(fp);
if(debug_flag)
log_msg("site_init: site exclude file %s read: %d entries, %d collisions",
SITEFILE, entries, collisions);
}
site_check(char *site)
{
SLISTPTR ptr;
ptr = &hash[HASHFN(site)];
if(debug_flag)
fprintf(stderr, " '%s: %08lx'", site, ptr);
if(!ptr->str)
return(0);
while(ptr)
{
if(strcmp(site, ptr->str) == 0)
return(1);
ptr = ptr->next;
}
return(0);
}
site_droparticle(char *id)
{
if(dropfp)
fprintf(dropfp, "%s\n", id);
else
log_msg("Excluded article: %s", id);
}
site_close()
{
if(dropfp)
fclose(dropfp);
}
#ifdef TEST
main(int argc, char **argv)
{
site_init();
argv++;
argc--;
while(argc--)
{
if(site_check(*argv))
printf("Found %s\n", *argv);
argv++;
}
return(0);
}
#endif /*TEST*/
#endif /* SITEEXCLUDING */
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