849075a0 |
1 | /* |
2 | * adnsheloex.c |
3 | * - look up the A record of hosts in an Exim log that failed HELO verification |
4 | */ |
5 | /* |
6 | * This file is |
7 | * Copyright (C) 2004 Tony Finch <dot@dotat.at> |
8 | * |
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> |
12 | * |
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) |
16 | * any later version. |
17 | * |
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. |
22 | * |
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. |
26 | * |
27 | * This file is by Tony Finch, based on adnslogres.c. |
28 | */ |
29 | |
30 | static const char * const cvsid = |
31 | "$Id$"; |
32 | |
33 | #include <sys/types.h> |
34 | #include <sys/socket.h> |
35 | #include <sys/time.h> |
36 | |
37 | #include <netinet/in.h> |
38 | #include <arpa/inet.h> |
39 | |
40 | #include <unistd.h> |
41 | #include <string.h> |
42 | #include <stdlib.h> |
43 | #include <stdio.h> |
44 | #include <ctype.h> |
45 | #include <errno.h> |
46 | #include <stdarg.h> |
47 | |
48 | #include "config.h" |
49 | #include "adns.h" |
50 | #include "client.h" |
51 | |
52 | #ifdef ADNS_REGRESS_TEST |
53 | # include "hredirect.h" |
54 | #endif |
55 | |
56 | /* maximum number of concurrent DNS queries */ |
57 | #define MAXMAXPENDING 64000 |
58 | #define DEFMAXPENDING 2000 |
59 | |
60 | /* maximum length of a line */ |
61 | #define MAXLINE 1024 |
62 | |
63 | /* option flags */ |
64 | #define OPT_DEBUG 1 |
65 | #define OPT_POLL 2 |
66 | |
67 | static const char *const progname= "adnsheloex"; |
68 | static const char *config_text; |
69 | |
70 | #define guard_null(str) ((str) ? (str) : "") |
71 | |
72 | #define sensible_ctype(type,ch) (type((unsigned char)(ch))) |
73 | /* isfoo() functions from ctype.h can't safely be fed char - blech ! */ |
74 | |
75 | static void msg(const char *fmt, ...) { |
76 | va_list al; |
77 | |
78 | fprintf(stderr, "%s: ", progname); |
79 | va_start(al,fmt); |
80 | vfprintf(stderr, fmt, al); |
81 | va_end(al); |
82 | fputc('\n',stderr); |
83 | } |
84 | |
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); |
89 | exit(1); |
90 | } |
91 | |
92 | typedef struct logline { |
93 | struct logline *next; |
94 | char *start, *name, *rest, *addr; |
95 | adns_query query; |
96 | } logline; |
97 | |
98 | static logline *readline(FILE *inf, adns_state adns, int opts) { |
99 | static char buf[MAXLINE]; |
100 | char *str, *p, *q, *r; |
101 | logline *line; |
102 | |
103 | if (fgets(buf, MAXLINE, inf)) { |
104 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
105 | if (!str) aargh("malloc"); |
106 | line= (logline*)str; |
107 | line->next= NULL; |
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)) { |
115 | r= strchr(p, '['); |
116 | if (!r) break; |
117 | q= strchr(p, ')'); |
118 | if (!q || q>r) break; |
119 | p= strchr(p, '('); |
120 | if (!p || p>q) break; |
121 | line->name= p+1; |
122 | line->rest= q; |
123 | line->addr= r+1; |
124 | break; |
125 | } |
126 | } |
127 | if (line->name) { |
128 | *line->rest= '\0'; |
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, |
133 | NULL, &line->query)) |
134 | aargh("adns_submit"); |
135 | *line->rest= ')'; |
136 | } else { |
137 | if (opts & OPT_DEBUG) |
138 | msg("no query"); |
139 | line->query= NULL; |
140 | } |
141 | return line; |
142 | } |
143 | if (!feof(inf)) |
144 | aargh("fgets"); |
145 | return NULL; |
146 | } |
147 | |
148 | static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) { |
149 | int eof, err, len; |
150 | adns_state adns; |
151 | adns_answer *answer; |
152 | logline *head, *tail, *line; |
153 | adns_initflags initflags; |
154 | |
155 | initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0; |
156 | if (config_text) { |
157 | errno= adns_init_strcfg(&adns, initflags, stderr, config_text); |
158 | } else { |
159 | errno= adns_init(&adns, initflags, 0); |
160 | } |
161 | if (errno) aargh("adns_init"); |
162 | head= tail= readline(inf, adns, opts); |
163 | len= 1; eof= 0; |
164 | while (head) { |
165 | while (head) { |
166 | if (head->query) { |
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) { |
171 | if (opts & OPT_POLL) |
172 | err= adns_wait_poll(adns, &head->query, &answer, NULL); |
173 | else |
174 | err= adns_wait(adns, &head->query, &answer, NULL); |
175 | } else { |
176 | err= adns_check(adns, &head->query, &answer, NULL); |
177 | } |
178 | if (err == EAGAIN) break; |
179 | if (err) { |
180 | fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err)); |
181 | exit(1); |
182 | } |
183 | if (answer->status == adns_s_ok) { |
184 | const char *addr; |
185 | int ok = 0; |
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); |
191 | } |
192 | fprintf(outf, "%s%s", ok ? " OK" : "", head->rest); |
193 | } else { |
194 | if (opts & OPT_DEBUG) |
195 | msg("query failed"); |
196 | fputs(head->start, outf); |
197 | } |
198 | free(answer); |
199 | len--; |
200 | } else { |
201 | if (opts & OPT_DEBUG) |
202 | msg("%d in queue; no query on this line", len); |
203 | fputs(head->start, outf); |
204 | } |
205 | line= head; head= head->next; |
206 | free(line); |
207 | } |
208 | if (!eof) { |
209 | line= readline(inf, adns, opts); |
210 | if (line) { |
211 | if (!head) head= line; |
212 | else tail->next= line; |
213 | tail= line; |
214 | if (line->query) len++; |
215 | } else { |
216 | eof= 1; |
217 | } |
218 | } |
219 | } |
220 | adns_finish(adns); |
221 | } |
222 | |
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", |
230 | stdout); |
231 | } |
232 | |
233 | static void usage(void) { |
234 | printhelp(stderr); |
235 | exit(1); |
236 | } |
237 | |
238 | int main(int argc, char *argv[]) { |
239 | int c, opts, maxpending; |
240 | extern char *optarg; |
241 | FILE *inf; |
242 | |
243 | if (argv[1] && !strncmp(argv[1],"--",2)) { |
244 | if (!strcmp(argv[1],"--help")) { |
245 | printhelp(stdout); |
246 | } else if (!strcmp(argv[1],"--version")) { |
247 | fputs(VERSION_MESSAGE("adnsheloex"),stdout); |
248 | } else { |
249 | usage(); |
250 | } |
251 | if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); } |
252 | exit(0); |
253 | } |
254 | |
255 | maxpending= DEFMAXPENDING; |
256 | opts= 0; |
257 | while ((c= getopt(argc, argv, "c:C:dp")) != -1) |
258 | switch (c) { |
259 | case 'c': |
260 | maxpending= atoi(optarg); |
261 | if (maxpending < 1 || maxpending > MAXMAXPENDING) { |
262 | fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending); |
263 | exit(1); |
264 | } |
265 | break; |
266 | case 'C': |
267 | config_text= optarg; |
268 | break; |
269 | case 'd': |
270 | opts|= OPT_DEBUG; |
271 | break; |
272 | case 'p': |
273 | opts|= OPT_POLL; |
274 | break; |
275 | default: |
276 | usage(); |
277 | } |
278 | |
279 | argc-= optind; |
280 | argv+= optind; |
281 | |
282 | inf= NULL; |
283 | if (argc == 0) |
284 | inf= stdin; |
285 | else if (argc == 1) |
286 | inf= fopen(*argv, "r"); |
287 | else |
288 | usage(); |
289 | |
290 | if (!inf) |
291 | aargh("couldn't open input"); |
292 | |
293 | proclog(inf, stdout, maxpending, opts); |
294 | |
295 | if (fclose(inf)) |
296 | aargh("fclose input"); |
297 | if (fclose(stdout)) |
298 | aargh("fclose output"); |
299 | |
300 | return 0; |
301 | } |