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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) 1997-2000,2003,2006 Ian Jackson |
12 | * Copyright (C) 1999-2000,2003,2006 Tony Finch |
13 | * Copyright (C) 1991 Massachusetts Institute of Technology |
14 | * (See the file INSTALL for full details.) |
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15 | * |
16 | * This program is free software; you can redistribute it and/or modify |
17 | * it under the terms of the GNU General Public License as published by |
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18 | * the Free Software Foundation; either version 3, or (at your option) |
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19 | * any later version. |
20 | * |
21 | * This program is distributed in the hope that it will be useful, |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
24 | * GNU General Public License for more details. |
25 | * |
26 | * You should have received a copy of the GNU General Public License |
27 | * along with this program; if not, write to the Free Software Foundation, |
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28 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
29 | * |
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30 | * This version was originally supplied by Tony Finch, but has been |
31 | * modified by Ian Jackson as it was incorporated into adns and |
32 | * subsequently. |
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33 | */ |
34 | |
35 | static const char * const cvsid = |
36 | "$Id$"; |
37 | |
38 | #include <sys/types.h> |
39 | #include <sys/time.h> |
40 | |
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41 | #include <unistd.h> |
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42 | #include <string.h> |
43 | #include <stdlib.h> |
44 | #include <stdio.h> |
45 | #include <ctype.h> |
46 | #include <errno.h> |
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47 | #include <stdarg.h> |
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48 | |
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49 | #include "config.h" |
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50 | #include "adns.h" |
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51 | #include "client.h" |
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52 | |
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53 | #ifdef ADNS_REGRESS_TEST |
54 | # include "hredirect.h" |
55 | #endif |
56 | |
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57 | /* maximum number of concurrent DNS queries */ |
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58 | #define MAXMAXPENDING 64000 |
59 | #define DEFMAXPENDING 2000 |
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60 | |
61 | /* maximum length of a line */ |
62 | #define MAXLINE 1024 |
63 | |
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64 | /* option flags */ |
65 | #define OPT_DEBUG 1 |
66 | #define OPT_POLL 2 |
67 | |
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68 | static const char *const progname= "adnslogres"; |
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69 | static const char *config_text; |
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70 | |
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71 | #define guard_null(str) ((str) ? (str) : "") |
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72 | |
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73 | #define sensible_ctype(type,ch) (type((unsigned char)(ch))) |
74 | /* isfoo() functions from ctype.h can't safely be fed char - blech ! */ |
75 | |
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76 | static void msg(const char *fmt, ...) { |
77 | va_list al; |
78 | |
79 | fprintf(stderr, "%s: ", progname); |
80 | va_start(al,fmt); |
81 | vfprintf(stderr, fmt, al); |
82 | va_end(al); |
83 | fputc('\n',stderr); |
84 | } |
85 | |
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86 | static void aargh(const char *cause) { |
87 | const char *why = strerror(errno); |
88 | if (!why) why = "Unknown error"; |
89 | msg("%s: %s (%d)", cause, why, errno); |
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90 | exit(1); |
91 | } |
92 | |
93 | /* |
94 | * Parse the IP address and convert to a reverse domain name. |
95 | */ |
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96 | static char *ipaddr2domain(char *start, char **addr, char **rest) { |
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97 | static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */ |
98 | char *ptrs[5]; |
99 | int i; |
100 | |
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101 | ptrs[0]= start; |
102 | retry: |
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103 | while (!sensible_ctype(isdigit,*ptrs[0])) |
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104 | if (!*ptrs[0]++) { |
105 | strcpy(buf, "invalid."); |
106 | *addr= *rest= NULL; |
107 | return buf; |
108 | } |
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109 | for (i= 1; i < 5; i++) { |
110 | ptrs[i]= ptrs[i-1]; |
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111 | while (sensible_ctype(isdigit,*ptrs[i]++)); |
112 | if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) || |
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113 | (i != 4 && ptrs[i][-1] != '.') || |
114 | (ptrs[i]-ptrs[i-1] > 4)) { |
115 | ptrs[0]= ptrs[i]-1; |
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116 | goto retry; |
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117 | } |
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118 | } |
119 | sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.", |
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120 | (int)(ptrs[4]-ptrs[3]-1), ptrs[3], |
121 | (int)(ptrs[3]-ptrs[2]-1), ptrs[2], |
122 | (int)(ptrs[2]-ptrs[1]-1), ptrs[1], |
123 | (int)(ptrs[1]-ptrs[0]-1), ptrs[0]); |
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124 | *addr= ptrs[0]; |
125 | *rest= ptrs[4]-1; |
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126 | return buf; |
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127 | } |
128 | |
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129 | static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) { |
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130 | if (domain) |
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131 | fprintf(outf, "%.*s%s%s", (int)(addr - start), start, domain, rest); |
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132 | else |
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133 | fputs(start, outf); |
134 | if (ferror(outf)) aargh("write output"); |
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135 | } |
136 | |
137 | typedef struct logline { |
138 | struct logline *next; |
139 | char *start, *addr, *rest; |
140 | adns_query query; |
141 | } logline; |
142 | |
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143 | static logline *readline(FILE *inf, adns_state adns, int opts) { |
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144 | static char buf[MAXLINE]; |
145 | char *str; |
146 | logline *line; |
147 | |
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148 | if (fgets(buf, MAXLINE, inf)) { |
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149 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
150 | if (!str) aargh("malloc"); |
151 | line= (logline*)str; |
152 | line->next= NULL; |
153 | line->start= str+sizeof(logline); |
154 | strcpy(line->start, buf); |
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155 | str= ipaddr2domain(line->start, &line->addr, &line->rest); |
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156 | if (opts & OPT_DEBUG) |
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157 | msg("submitting %.*s -> %s", (int)(line->rest-line->addr), guard_null(line->addr), str); |
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158 | if (adns_submit(adns, str, adns_r_ptr, |
159 | adns_qf_quoteok_cname|adns_qf_cname_loose, |
160 | NULL, &line->query)) |
161 | aargh("adns_submit"); |
162 | return line; |
163 | } |
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164 | if (!feof(inf)) |
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165 | aargh("fgets"); |
166 | return NULL; |
167 | } |
168 | |
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169 | static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) { |
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170 | int eof, err, len; |
171 | adns_state adns; |
172 | adns_answer *answer; |
173 | logline *head, *tail, *line; |
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174 | adns_initflags initflags; |
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175 | |
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176 | initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0; |
177 | if (config_text) { |
178 | errno= adns_init_strcfg(&adns, initflags, stderr, config_text); |
179 | } else { |
180 | errno= adns_init(&adns, initflags, 0); |
181 | } |
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182 | if (errno) aargh("adns_init"); |
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183 | head= tail= readline(inf, adns, opts); |
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184 | len= 1; eof= 0; |
185 | while (head) { |
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186 | while (head) { |
187 | if (opts & OPT_DEBUG) |
188 | msg("%d in queue; checking %.*s", len, |
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189 | (int)(head->rest-head->addr), guard_null(head->addr)); |
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190 | if (eof || len >= maxpending) { |
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191 | if (opts & OPT_POLL) |
192 | err= adns_wait_poll(adns, &head->query, &answer, NULL); |
193 | else |
194 | err= adns_wait(adns, &head->query, &answer, NULL); |
195 | } else { |
196 | err= adns_check(adns, &head->query, &answer, NULL); |
197 | } |
198 | if (err == EAGAIN) break; |
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199 | if (err) { |
200 | fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err)); |
201 | exit(1); |
202 | } |
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203 | printline(outf, head->start, head->addr, head->rest, |
204 | answer->status == adns_s_ok ? *answer->rrs.str : NULL); |
205 | line= head; head= head->next; |
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206 | free(line); |
207 | free(answer); |
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208 | len--; |
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209 | } |
210 | if (!eof) { |
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211 | line= readline(inf, adns, opts); |
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212 | if (line) { |
213 | if (!head) head= line; |
214 | else tail->next= line; |
215 | tail= line; len++; |
216 | } else { |
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217 | eof= 1; |
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218 | } |
219 | } |
220 | } |
221 | adns_finish(adns); |
222 | } |
223 | |
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224 | static void printhelp(FILE *file) { |
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225 | fputs("usage: adnslogres [<options>] [<logfile>]\n" |
226 | " adnslogres --version|--help\n" |
227 | "options: -c <concurrency> set max number of outstanding queries\n" |
228 | " -p use poll(2) instead of select(2)\n" |
229 | " -d turn on debugging\n" |
230 | " -C <config> use instead of contents of resolv.conf\n", |
231 | stdout); |
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232 | } |
233 | |
234 | static void usage(void) { |
235 | printhelp(stderr); |
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236 | exit(1); |
237 | } |
238 | |
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239 | int main(int argc, char *argv[]) { |
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240 | int c, opts, maxpending; |
241 | extern char *optarg; |
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242 | FILE *inf; |
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243 | |
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244 | if (argv[1] && !strncmp(argv[1],"--",2)) { |
245 | if (!strcmp(argv[1],"--help")) { |
246 | printhelp(stdout); |
247 | } else if (!strcmp(argv[1],"--version")) { |
248 | fputs(VERSION_MESSAGE("adnslogres"),stdout); |
249 | } else { |
250 | usage(); |
251 | } |
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252 | if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); } |
253 | exit(0); |
254 | } |
255 | |
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256 | maxpending= DEFMAXPENDING; |
257 | opts= 0; |
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258 | while ((c= getopt(argc, argv, "c:C:dp")) != -1) |
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259 | switch (c) { |
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260 | case 'c': |
261 | maxpending= atoi(optarg); |
262 | if (maxpending < 1 || maxpending > MAXMAXPENDING) { |
263 | fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending); |
264 | exit(1); |
265 | } |
266 | break; |
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267 | case 'C': |
268 | config_text= optarg; |
269 | break; |
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270 | case 'd': |
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271 | opts|= OPT_DEBUG; |
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272 | break; |
273 | case 'p': |
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274 | opts|= OPT_POLL; |
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275 | break; |
276 | default: |
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277 | usage(); |
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278 | } |
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279 | |
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280 | argc-= optind; |
281 | argv+= optind; |
282 | |
283 | inf= NULL; |
284 | if (argc == 0) |
285 | inf= stdin; |
286 | else if (argc == 1) |
287 | inf= fopen(*argv, "r"); |
288 | else |
289 | usage(); |
290 | |
291 | if (!inf) |
292 | aargh("couldn't open input"); |
293 | |
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294 | proclog(inf, stdout, maxpending, opts); |
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295 | |
296 | if (fclose(inf)) |
297 | aargh("fclose input"); |
298 | if (fclose(stdout)) |
299 | aargh("fclose output"); |
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300 | |
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301 | return 0; |
302 | } |