3 * - look up the A record of hosts in an Exim log that failed HELO verification
7 * Copyright (C) 2004 Tony Finch <dot@dotat.at>
9 * It is part of adns, which is
10 * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
11 * Copyright (C) 1999-2004 Tony Finch <dot@dotat.at>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2, or (at your option)
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software Foundation,
25 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 * This file is by Tony Finch, based on adnslogres.c.
30 static const char * const cvsid =
31 "$Id: adnsheloex.c,v 1.1 2005/03/16 21:28:51 ian Exp $";
33 #include <sys/types.h>
34 #include <sys/socket.h>
37 #include <netinet/in.h>
38 #include <arpa/inet.h>
52 #ifdef ADNS_REGRESS_TEST
53 # include "hredirect.h"
56 /* maximum number of concurrent DNS queries */
57 #define MAXMAXPENDING 64000
58 #define DEFMAXPENDING 2000
60 /* maximum length of a line */
67 static const char *const progname= "adnsheloex";
68 static const char *config_text;
70 #define guard_null(str) ((str) ? (str) : "")
72 #define sensible_ctype(type,ch) (type((unsigned char)(ch)))
73 /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
75 static void msg(const char *fmt, ...) {
78 fprintf(stderr, "%s: ", progname);
80 vfprintf(stderr, fmt, al);
85 static void aargh(const char *cause) {
86 const char *why = strerror(errno);
87 if (!why) why = "Unknown error";
88 msg("%s: %s (%d)", cause, why, errno);
92 typedef struct logline {
94 char *start, *name, *rest, *addr;
98 static logline *readline(FILE *inf, adns_state adns, int opts) {
99 static char buf[MAXLINE];
100 char *str, *p, *q, *r;
103 if (fgets(buf, MAXLINE, inf)) {
104 str= malloc(sizeof(*line) + strlen(buf) + 1);
105 if (!str) aargh("malloc");
108 line->start= str+sizeof(logline);
109 strcpy(line->start, buf);
110 line->name= line->rest= line->addr= NULL;
111 /* look for unverifiable HELO information matching the regex
112 H=[a-z0-9.- ]*[(][a-z0-9.-]*[)] [[][0-9.]*[]] */
113 for (p= strchr(line->start, ' '); p; p= strchr(p+1, ' ')) {
114 if (!strncmp(p, " H=", 3)) {
118 if (!q || q>r) break;
120 if (!p || p>q) break;
129 if (opts & OPT_DEBUG)
130 msg("submitting %s", line->name);
131 if (adns_submit(adns, line->name, adns_r_a,
132 adns_qf_quoteok_query|adns_qf_quoteok_cname|adns_qf_cname_loose,
134 aargh("adns_submit");
137 if (opts & OPT_DEBUG)
148 static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
152 logline *head, *tail, *line;
153 adns_initflags initflags;
155 initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0;
157 errno= adns_init_strcfg(&adns, initflags, stderr, config_text);
159 errno= adns_init(&adns, initflags, 0);
161 if (errno) aargh("adns_init");
162 head= tail= readline(inf, adns, opts);
167 if (opts & OPT_DEBUG)
168 msg("%d in queue; checking %.*s", len,
169 head->rest-head->name, guard_null(head->name));
170 if (eof || len >= maxpending) {
172 err= adns_wait_poll(adns, &head->query, &answer, NULL);
174 err= adns_wait(adns, &head->query, &answer, NULL);
176 err= adns_check(adns, &head->query, &answer, NULL);
178 if (err == EAGAIN) break;
180 fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err));
183 if (answer->status == adns_s_ok) {
186 fprintf(outf, "%.*s", head->rest-head->start, head->start);
187 while(answer->nrrs--) {
188 addr= inet_ntoa(answer->rrs.inaddr[answer->nrrs]);
189 ok |= !strncmp(addr, head->addr, strlen(addr));
190 fprintf(outf, " [%s]", addr);
192 fprintf(outf, "%s%s", ok ? " OK" : "", head->rest);
194 if (opts & OPT_DEBUG)
196 fputs(head->start, outf);
201 if (opts & OPT_DEBUG)
202 msg("%d in queue; no query on this line", len);
203 fputs(head->start, outf);
205 line= head; head= head->next;
209 line= readline(inf, adns, opts);
211 if (!head) head= line;
212 else tail->next= line;
214 if (line->query) len++;
223 static void printhelp(FILE *file) {
224 fputs("usage: adnsheloex [<options>] [<logfile>]\n"
225 " adnsheloex --version|--help\n"
226 "options: -c <concurrency> set max number of outstanding queries\n"
227 " -p use poll(2) instead of select(2)\n"
228 " -d turn on debugging\n"
229 " -C <config> use instead of contents of resolv.conf\n",
233 static void usage(void) {
238 int main(int argc, char *argv[]) {
239 int c, opts, maxpending;
243 if (argv[1] && !strncmp(argv[1],"--",2)) {
244 if (!strcmp(argv[1],"--help")) {
246 } else if (!strcmp(argv[1],"--version")) {
247 fputs(VERSION_MESSAGE("adnsheloex"),stdout);
251 if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
255 maxpending= DEFMAXPENDING;
257 while ((c= getopt(argc, argv, "c:C:dp")) != -1)
260 maxpending= atoi(optarg);
261 if (maxpending < 1 || maxpending > MAXMAXPENDING) {
262 fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
286 inf= fopen(*argv, "r");
291 aargh("couldn't open input");
293 proclog(inf, stdout, maxpending, opts);
296 aargh("fclose input");
298 aargh("fclose output");