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1 | /* |
2 | * adnslogres.c |
3 | * - a replacement for the Apache logresolve program using adns |
4 | */ |
5 | /* |
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6 | * This file is |
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7 | * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at> |
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8 | * Copyright (C) 1999-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
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9 | * |
10 | * It is part of adns, which is |
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11 | * Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
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12 | * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at> |
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13 | * |
14 | * This program is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2, or (at your option) |
17 | * any later version. |
18 | * |
19 | * This program is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with this program; if not, write to the Free Software Foundation, |
2b4bbcac |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | * |
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28 | * This version was originally supplied by Tony Finch, but has been |
29 | * modified by Ian Jackson as it was incorporated into adns and |
30 | * subsequently. |
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31 | */ |
32 | |
33 | static const char * const cvsid = |
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34 | "$Id: adnslogres.c,v 1.20 2000/09/17 14:09:02 ian Exp $"; |
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35 | |
36 | #include <sys/types.h> |
37 | #include <sys/time.h> |
38 | |
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39 | #include <unistd.h> |
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40 | #include <string.h> |
41 | #include <stdlib.h> |
42 | #include <stdio.h> |
43 | #include <ctype.h> |
44 | #include <errno.h> |
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45 | #include <stdarg.h> |
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46 | |
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47 | #include "config.h" |
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48 | #include "adns.h" |
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49 | #include "client.h" |
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50 | |
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51 | #ifdef ADNS_REGRESS_TEST |
52 | # include "hredirect.h" |
53 | #endif |
54 | |
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55 | /* maximum number of concurrent DNS queries */ |
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56 | #define MAXMAXPENDING 64000 |
57 | #define DEFMAXPENDING 2000 |
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58 | |
59 | /* maximum length of a line */ |
60 | #define MAXLINE 1024 |
61 | |
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62 | /* option flags */ |
63 | #define OPT_DEBUG 1 |
64 | #define OPT_POLL 2 |
65 | |
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66 | static const char *const progname= "adnslogres"; |
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67 | static const char *config_text; |
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68 | |
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69 | #define guard_null(str) ((str) ? (str) : "") |
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70 | |
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71 | #define sensible_ctype(type,ch) (type((unsigned char)(ch))) |
72 | /* isfoo() functions from ctype.h can't safely be fed char - blech ! */ |
73 | |
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74 | static void msg(const char *fmt, ...) { |
75 | va_list al; |
76 | |
77 | fprintf(stderr, "%s: ", progname); |
78 | va_start(al,fmt); |
79 | vfprintf(stderr, fmt, al); |
80 | va_end(al); |
81 | fputc('\n',stderr); |
82 | } |
83 | |
1bd9afad |
84 | static void aargh(const char *cause) { |
85 | const char *why = strerror(errno); |
86 | if (!why) why = "Unknown error"; |
87 | msg("%s: %s (%d)", cause, why, errno); |
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88 | exit(1); |
89 | } |
90 | |
91 | /* |
92 | * Parse the IP address and convert to a reverse domain name. |
93 | */ |
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94 | static char *ipaddr2domain(char *start, char **addr, char **rest) { |
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95 | static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */ |
96 | char *ptrs[5]; |
97 | int i; |
98 | |
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99 | ptrs[0]= start; |
100 | retry: |
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101 | while (!sensible_ctype(isdigit,*ptrs[0])) |
ef20fccf |
102 | if (!*ptrs[0]++) { |
103 | strcpy(buf, "invalid."); |
104 | *addr= *rest= NULL; |
105 | return buf; |
106 | } |
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107 | for (i= 1; i < 5; i++) { |
108 | ptrs[i]= ptrs[i-1]; |
acff310d |
109 | while (sensible_ctype(isdigit,*ptrs[i]++)); |
110 | if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) || |
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111 | (i != 4 && ptrs[i][-1] != '.') || |
112 | (ptrs[i]-ptrs[i-1] > 4)) { |
113 | ptrs[0]= ptrs[i]-1; |
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114 | goto retry; |
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115 | } |
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116 | } |
117 | sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.", |
118 | ptrs[4]-ptrs[3]-1, ptrs[3], |
119 | ptrs[3]-ptrs[2]-1, ptrs[2], |
120 | ptrs[2]-ptrs[1]-1, ptrs[1], |
121 | ptrs[1]-ptrs[0]-1, ptrs[0]); |
122 | *addr= ptrs[0]; |
123 | *rest= ptrs[4]-1; |
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124 | return buf; |
ab397b6e |
125 | } |
126 | |
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127 | static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) { |
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128 | if (domain) |
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129 | fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest); |
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130 | else |
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131 | fputs(start, outf); |
132 | if (ferror(outf)) aargh("write output"); |
ab397b6e |
133 | } |
134 | |
135 | typedef struct logline { |
136 | struct logline *next; |
137 | char *start, *addr, *rest; |
138 | adns_query query; |
139 | } logline; |
140 | |
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141 | static logline *readline(FILE *inf, adns_state adns, int opts) { |
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142 | static char buf[MAXLINE]; |
143 | char *str; |
144 | logline *line; |
145 | |
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146 | if (fgets(buf, MAXLINE, inf)) { |
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147 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
148 | if (!str) aargh("malloc"); |
149 | line= (logline*)str; |
150 | line->next= NULL; |
151 | line->start= str+sizeof(logline); |
152 | strcpy(line->start, buf); |
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153 | str= ipaddr2domain(line->start, &line->addr, &line->rest); |
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154 | if (opts & OPT_DEBUG) |
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155 | msg("submitting %.*s -> %s", line->rest-line->addr, guard_null(line->addr), str); |
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156 | if (adns_submit(adns, str, adns_r_ptr, |
157 | adns_qf_quoteok_cname|adns_qf_cname_loose, |
158 | NULL, &line->query)) |
159 | aargh("adns_submit"); |
160 | return line; |
161 | } |
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162 | if (!feof(inf)) |
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163 | aargh("fgets"); |
164 | return NULL; |
165 | } |
166 | |
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167 | static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) { |
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168 | int eof, err, len; |
169 | adns_state adns; |
170 | adns_answer *answer; |
171 | logline *head, *tail, *line; |
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172 | adns_initflags initflags; |
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173 | |
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174 | initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0; |
175 | if (config_text) { |
176 | errno= adns_init_strcfg(&adns, initflags, stderr, config_text); |
177 | } else { |
178 | errno= adns_init(&adns, initflags, 0); |
179 | } |
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180 | if (errno) aargh("adns_init"); |
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181 | head= tail= readline(inf, adns, opts); |
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182 | len= 1; eof= 0; |
183 | while (head) { |
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184 | while (head) { |
185 | if (opts & OPT_DEBUG) |
186 | msg("%d in queue; checking %.*s", len, |
187 | head->rest-head->addr, guard_null(head->addr)); |
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188 | if (eof || len >= maxpending) { |
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189 | if (opts & OPT_POLL) |
190 | err= adns_wait_poll(adns, &head->query, &answer, NULL); |
191 | else |
192 | err= adns_wait(adns, &head->query, &answer, NULL); |
193 | } else { |
194 | err= adns_check(adns, &head->query, &answer, NULL); |
195 | } |
196 | if (err == EAGAIN) break; |
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197 | if (err) { |
198 | fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err)); |
199 | exit(1); |
200 | } |
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201 | printline(outf, head->start, head->addr, head->rest, |
202 | answer->status == adns_s_ok ? *answer->rrs.str : NULL); |
203 | line= head; head= head->next; |
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204 | free(line); |
205 | free(answer); |
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206 | len--; |
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207 | } |
208 | if (!eof) { |
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209 | line= readline(inf, adns, opts); |
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210 | if (line) { |
211 | if (!head) head= line; |
212 | else tail->next= line; |
213 | tail= line; len++; |
214 | } else { |
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215 | eof= 1; |
ab397b6e |
216 | } |
217 | } |
218 | } |
219 | adns_finish(adns); |
220 | } |
221 | |
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222 | static void printhelp(FILE *file) { |
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223 | fputs("usage: adnslogres [<options>] [<logfile>]\n" |
224 | " adnslogres --version|--help\n" |
225 | "options: -c <concurrency> set max number of outstanding queries\n" |
226 | " -p use poll(2) instead of select(2)\n" |
227 | " -d turn on debugging\n" |
228 | " -C <config> use instead of contents of resolv.conf\n", |
229 | stdout); |
aa958273 |
230 | } |
231 | |
232 | static void usage(void) { |
233 | printhelp(stderr); |
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234 | exit(1); |
235 | } |
236 | |
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237 | int main(int argc, char *argv[]) { |
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238 | int c, opts, maxpending; |
239 | extern char *optarg; |
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240 | FILE *inf; |
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241 | |
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242 | if (argv[1] && !strncmp(argv[1],"--",2)) { |
243 | if (!strcmp(argv[1],"--help")) { |
244 | printhelp(stdout); |
245 | } else if (!strcmp(argv[1],"--version")) { |
246 | fputs(VERSION_MESSAGE("adnslogres"),stdout); |
247 | } else { |
248 | usage(); |
249 | } |
aa958273 |
250 | if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); } |
251 | exit(0); |
252 | } |
253 | |
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254 | maxpending= DEFMAXPENDING; |
255 | opts= 0; |
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256 | while ((c= getopt(argc, argv, "c:C:dp")) != -1) |
ef20fccf |
257 | switch (c) { |
6fb17308 |
258 | case 'c': |
259 | maxpending= atoi(optarg); |
260 | if (maxpending < 1 || maxpending > MAXMAXPENDING) { |
261 | fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending); |
262 | exit(1); |
263 | } |
264 | break; |
f26a66d0 |
265 | case 'C': |
266 | config_text= optarg; |
267 | break; |
ef20fccf |
268 | case 'd': |
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269 | opts|= OPT_DEBUG; |
ef20fccf |
270 | break; |
271 | case 'p': |
80775c8e |
272 | opts|= OPT_POLL; |
ef20fccf |
273 | break; |
274 | default: |
80775c8e |
275 | usage(); |
ef20fccf |
276 | } |
ef20fccf |
277 | |
80775c8e |
278 | argc-= optind; |
279 | argv+= optind; |
280 | |
281 | inf= NULL; |
282 | if (argc == 0) |
283 | inf= stdin; |
284 | else if (argc == 1) |
285 | inf= fopen(*argv, "r"); |
286 | else |
287 | usage(); |
288 | |
289 | if (!inf) |
290 | aargh("couldn't open input"); |
291 | |
6fb17308 |
292 | proclog(inf, stdout, maxpending, opts); |
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293 | |
294 | if (fclose(inf)) |
295 | aargh("fclose input"); |
296 | if (fclose(stdout)) |
297 | aargh("fclose output"); |
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298 | |
ab397b6e |
299 | return 0; |
300 | } |