3 * - a replacement for the Apache logresolve program using adns
6 * This file is Copyright (C) 1999 Tony Finch <fanf@demon.net> <dot@dotat.at>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 static const char * const cvsid =
26 #include <sys/types.h>
37 /* maximum number of concurrent DNS queries */
38 #define MAXPENDING 1000
40 /* maximum length of a line */
43 static const char *progname;
45 static void aargh(const char *msg) {
46 fprintf(stderr, "%s: %s: %s (%d)\n", progname, msg,
47 strerror(errno) ? strerror(errno) : "Unknown error", errno);
52 * Parse the IP address and convert to a reverse domain name.
54 static void ipaddr2domain(char *start, char **addr, char **rest, char **domain) {
55 static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
59 for (ptrs[0]= start; !isdigit(*ptrs[0]); ptrs[0]++)
62 for (i= 1; i < 5; i ++) {
63 ptrs[i]= strchr(ptrs[i-1], (i == 4) ? ' ' : '.');
64 if (!ptrs[i] || ptrs[i]-ptrs[i-1] > 3)
69 sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
70 ptrs[4]-ptrs[3]-1, ptrs[3],
71 ptrs[3]-ptrs[2]-1, ptrs[2],
72 ptrs[2]-ptrs[1]-1, ptrs[1],
73 ptrs[1]-ptrs[0]-1, ptrs[0]);
79 strcpy(buf, "invalid.");
85 static void printline(char *start, char *addr, char *rest, char *domain) {
87 printf("%.*s%s%s", addr - start, start, domain, rest);
90 /* XXX: error checking */
93 typedef struct logline {
95 char *start, *addr, *rest;
99 static logline *readline(adns_state adns) {
100 static char buf[MAXLINE];
104 if (fgets(buf, MAXLINE, stdin)) {
105 str= malloc(sizeof(*line) + strlen(buf) + 1);
106 if (!str) aargh("malloc");
109 line->start= str+sizeof(logline);
110 strcpy(line->start, buf);
111 ipaddr2domain(line->start, &line->addr, &line->rest, &str);
112 if (adns_submit(adns, str, adns_r_ptr,
113 adns_qf_quoteok_cname|adns_qf_cname_loose,
115 aargh("adns_submit");
123 static void proclog(void) {
127 logline *head, *tail, *line;
129 errno= adns_init(&adns, 0, 0);
130 if (errno) aargh("adns_init");
131 head= tail= readline(adns);
134 if (eof || len > MAXPENDING)
135 err= adns_wait(adns, &head->query, &answer, NULL);
137 err= adns_check(adns, &head->query, &answer, NULL);
138 if (err != EWOULDBLOCK) {
139 printline(head->start, head->addr, head->rest,
140 answer->status == adns_s_ok ? *answer->rrs.str : NULL);
141 line= head; head= head->next;
142 free(line); free(answer);
146 line= readline(adns);
162 int main(int argc, char *argv[])