+/*
+ * adnsheloex.c
+ * - look up the A record of hosts in an Exim log that failed HELO verification
+ */
+/*
+ * This file is
+ * Copyright (C) 2004 Tony Finch <dot@dotat.at>
+ *
+ * It is part of adns, which is
+ * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
+ * Copyright (C) 1999-2004 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 file is by Tony Finch, based on adnslogres.c.
+ */
+
+static const char * const cvsid =
+ "$Id$";
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdarg.h>
+
+#include "config.h"
+#include "adns.h"
+#include "client.h"
+
+#ifdef ADNS_REGRESS_TEST
+# include "hredirect.h"
+#endif
+
+/* maximum number of concurrent DNS queries */
+#define MAXMAXPENDING 64000
+#define DEFMAXPENDING 2000
+
+/* maximum length of a line */
+#define MAXLINE 1024
+
+/* option flags */
+#define OPT_DEBUG 1
+#define OPT_POLL 2
+
+static const char *const progname= "adnsheloex";
+static const char *config_text;
+
+#define guard_null(str) ((str) ? (str) : "")
+
+#define sensible_ctype(type,ch) (type((unsigned char)(ch)))
+ /* isfoo() functions from ctype.h can't safely be fed char - blech ! */
+
+static void msg(const char *fmt, ...) {
+ va_list al;
+
+ fprintf(stderr, "%s: ", progname);
+ va_start(al,fmt);
+ vfprintf(stderr, fmt, al);
+ va_end(al);
+ fputc('\n',stderr);
+}
+
+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);
+}
+
+typedef struct logline {
+ struct logline *next;
+ char *start, *name, *rest, *addr;
+ adns_query query;
+} logline;
+
+static logline *readline(FILE *inf, adns_state adns, int opts) {
+ static char buf[MAXLINE];
+ char *str, *p, *q, *r;
+ 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);
+ line->name= line->rest= line->addr= NULL;
+ /* look for unverifiable HELO information matching the regex
+ H=[a-z0-9.- ]*[(][a-z0-9.-]*[)] [[][0-9.]*[]] */
+ for (p= strchr(line->start, ' '); p; p= strchr(p+1, ' ')) {
+ if (!strncmp(p, " H=", 3)) {
+ r= strchr(p, '[');
+ if (!r) break;
+ q= strchr(p, ')');
+ if (!q || q>r) break;
+ p= strchr(p, '(');
+ if (!p || p>q) break;
+ line->name= p+1;
+ line->rest= q;
+ line->addr= r+1;
+ break;
+ }
+ }
+ if (line->name) {
+ *line->rest= '\0';
+ if (opts & OPT_DEBUG)
+ msg("submitting %s", line->name);
+ if (adns_submit(adns, line->name, adns_r_a,
+ adns_qf_quoteok_query|adns_qf_quoteok_cname|adns_qf_cname_loose,
+ NULL, &line->query))
+ aargh("adns_submit");
+ *line->rest= ')';
+ } else {
+ if (opts & OPT_DEBUG)
+ msg("no query");
+ line->query= NULL;
+ }
+ return line;
+ }
+ if (!feof(inf))
+ aargh("fgets");
+ return NULL;
+}
+
+static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) {
+ int eof, err, len;
+ adns_state adns;
+ adns_answer *answer;
+ logline *head, *tail, *line;
+ adns_initflags initflags;
+
+ initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0;
+ if (config_text) {
+ errno= adns_init_strcfg(&adns, initflags, stderr, config_text);
+ } else {
+ errno= adns_init(&adns, initflags, 0);
+ }
+ if (errno) aargh("adns_init");
+ head= tail= readline(inf, adns, opts);
+ len= 1; eof= 0;
+ while (head) {
+ while (head) {
+ if (head->query) {
+ if (opts & OPT_DEBUG)
+ msg("%d in queue; checking %.*s", len,
+ head->rest-head->name, guard_null(head->name));
+ 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) break;
+ if (err) {
+ fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err));
+ exit(1);
+ }
+ if (answer->status == adns_s_ok) {
+ const char *addr;
+ int ok = 0;
+ fprintf(outf, "%.*s", head->rest-head->start, head->start);
+ while(answer->nrrs--) {
+ addr= inet_ntoa(answer->rrs.inaddr[answer->nrrs]);
+ ok |= !strncmp(addr, head->addr, strlen(addr));
+ fprintf(outf, " [%s]", addr);
+ }
+ fprintf(outf, "%s%s", ok ? " OK" : "", head->rest);
+ } else {
+ if (opts & OPT_DEBUG)
+ msg("query failed");
+ fputs(head->start, outf);
+ }
+ free(answer);
+ len--;
+ } else {
+ if (opts & OPT_DEBUG)
+ msg("%d in queue; no query on this line", len);
+ fputs(head->start, outf);
+ }
+ line= head; head= head->next;
+ free(line);
+ }
+ if (!eof) {
+ line= readline(inf, adns, opts);
+ if (line) {
+ if (!head) head= line;
+ else tail->next= line;
+ tail= line;
+ if (line->query) len++;
+ } else {
+ eof= 1;
+ }
+ }
+ }
+ adns_finish(adns);
+}
+
+static void printhelp(FILE *file) {
+ fputs("usage: adnsheloex [<options>] [<logfile>]\n"
+ " adnsheloex --version|--help\n"
+ "options: -c <concurrency> set max number of outstanding queries\n"
+ " -p use poll(2) instead of select(2)\n"
+ " -d turn on debugging\n"
+ " -C <config> use instead of contents of resolv.conf\n",
+ stdout);
+}
+
+static void usage(void) {
+ printhelp(stderr);
+ exit(1);
+}
+
+int main(int argc, char *argv[]) {
+ int c, opts, maxpending;
+ extern char *optarg;
+ FILE *inf;
+
+ if (argv[1] && !strncmp(argv[1],"--",2)) {
+ if (!strcmp(argv[1],"--help")) {
+ printhelp(stdout);
+ } else if (!strcmp(argv[1],"--version")) {
+ fputs(VERSION_MESSAGE("adnsheloex"),stdout);
+ } else {
+ usage();
+ }
+ if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); }
+ exit(0);
+ }
+
+ maxpending= DEFMAXPENDING;
+ opts= 0;
+ while ((c= getopt(argc, argv, "c:C:dp")) != -1)
+ switch (c) {
+ case 'c':
+ maxpending= atoi(optarg);
+ if (maxpending < 1 || maxpending > MAXMAXPENDING) {
+ fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending);
+ exit(1);
+ }
+ break;
+ case 'C':
+ config_text= optarg;
+ break;
+ 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, maxpending, opts);
+
+ if (fclose(inf))
+ aargh("fclose input");
+ if (fclose(stdout))
+ aargh("fclose output");
+
+ return 0;
+}
~ianmdlvl / adns.git / commitdiff