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/*
* adnslogres.c
* - a replacement for the Apache logresolve program using adns
*/
/*
* This file is
* Copyright (C) 1999 Tony Finch <dot@dotat.at>
* Copyright (C) 1999 Ian Jackson <ian@davenant.greenend.org.uk>
*
* It is part of adns, which is
* Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
* Copyright (C) 1999 Tony Finch <dot@dotat.at>
*
* 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* This version was originally supplied by Tony Finch, but has been
* modified by Ian Jackson as it was incorporated into adns.
*/
static const char * const cvsid =
"$Id: adnslogres.c,v 1.1.1.1 2000-02-16 17:32:28 sdyoung Exp $";
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include "adns.h"
/* maximum number of concurrent DNS queries */
#define MAXPENDING 1000
/* maximum length of a line */
#define MAXLINE 1024
/* option flags */
#define OPT_DEBUG 1
#define OPT_POLL 2
static const char *progname;
#define msg(fmt, args...) fprintf(stderr, "%s: " fmt "\n", progname, ##args)
static void aargh(const char *cause) {
const char *why = strerror(errno);
if (!why) why = "Unknown error";
msg("%s: %s (%d)", cause, why, errno);
exit(1);
}
/*
* Parse the IP address and convert to a reverse domain name.
*/
static char *ipaddr2domain(char *start, char **addr, char **rest) {
static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
char *ptrs[5];
int i;
ptrs[0]= start;
retry:
while (!isdigit(*ptrs[0]))
if (!*ptrs[0]++) {
strcpy(buf, "invalid.");
*addr= *rest= NULL;
return buf;
}
for (i= 1; i < 5; i++) {
ptrs[i]= ptrs[i-1];
while (isdigit(*ptrs[i]++));
if ((i == 4 && !isspace(ptrs[i][-1])) ||
(i != 4 && ptrs[i][-1] != '.') ||
(ptrs[i]-ptrs[i-1] > 4)) {
ptrs[0]= ptrs[i]-1;
goto retry;
}
}
sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
ptrs[4]-ptrs[3]-1, ptrs[3],
ptrs[3]-ptrs[2]-1, ptrs[2],
ptrs[2]-ptrs[1]-1, ptrs[1],
ptrs[1]-ptrs[0]-1, ptrs[0]);
*addr= ptrs[0];
*rest= ptrs[4]-1;
return buf;
}
static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) {
if (domain)
fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest);
else
fputs(start, outf);
if (ferror(outf)) aargh("write output");
}
typedef struct logline {
struct logline *next;
char *start, *addr, *rest;
adns_query query;
} logline;
static logline *readline(FILE *inf, adns_state adns, int opts) {
static char buf[MAXLINE];
char *str;
logline *line;
if (fgets(buf, MAXLINE, inf)) {
str= malloc(sizeof(*line) + strlen(buf) + 1);
if (!str) aargh("malloc");
line= (logline*)str;
line->next= NULL;
line->start= str+sizeof(logline);
strcpy(line->start, buf);
str= ipaddr2domain(line->start, &line->addr, &line->rest);
if (opts & OPT_DEBUG)
msg("submitting %.*s -> %s", line->rest-line->addr, line->addr, str);
if (adns_submit(adns, str, adns_r_ptr,
adns_qf_quoteok_cname|adns_qf_cname_loose,
NULL, &line->query))
aargh("adns_submit");
return line;
}
if (!feof(inf))
aargh("fgets");
return NULL;
}
static void proclog(FILE *inf, FILE *outf, int opts) {
int eof, err, len;
adns_state adns;
adns_answer *answer;
logline *head, *tail, *line;
errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
if (errno) aargh("adns_init");
head= tail= readline(inf, adns, opts);
len= 1; eof= 0;
while (head) {
if (opts & OPT_DEBUG)
msg("%d in queue; checking %.*s", len,
head->rest-head->addr, head->addr);
if (eof || len > MAXPENDING)
if (opts & OPT_POLL)
err= adns_wait_poll(adns, &head->query, &answer, NULL);
else
err= adns_wait(adns, &head->query, &answer, NULL);
else
err= adns_check(adns, &head->query, &answer, NULL);
if (err != EAGAIN) {
printline(outf, head->start, head->addr, head->rest,
answer->status == adns_s_ok ? *answer->rrs.str : NULL);
line= head; head= head->next;
free(line); free(answer);
len--;
}
if (!eof) {
line= readline(inf, adns, opts);
if (!line)
eof= 1;
else {
if (!head)
head= line;
else
tail->next= line;
tail= line;
len++;
}
}
}
adns_finish(adns);
}
static void usage(void) {
fprintf(stderr, "usage: %s [-d] [-p] [logfile]\n", progname);
exit(1);
}
int main(int argc, char *argv[]) {
int c, opts;
FILE *inf;
progname= strrchr(*argv, '/');
if (progname)
progname++;
else
progname= *argv;
opts= 0;
while ((c= getopt(argc, argv, "dp")) != -1)
switch (c) {
case 'd':
opts|= OPT_DEBUG;
break;
case 'p':
opts|= OPT_POLL;
break;
default:
usage();
}
argc-= optind;
argv+= optind;
inf= NULL;
if (argc == 0)
inf= stdin;
else if (argc == 1)
inf= fopen(*argv, "r");
else
usage();
if (!inf)
aargh("couldn't open input");
proclog(inf, stdout, opts);
if (fclose(inf))
aargh("fclose input");
if (fclose(stdout))
aargh("fclose output");
return 0;
}
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