| 1 | /* |
| 2 | * adnslogres.c |
| 3 | * - a replacement for the Apache logresolve program using adns |
| 4 | */ |
| 5 | /* |
| 6 | * This file is |
| 7 | * Copyright (C) 1999-2000 Tony Finch <dot@dotat.at> |
| 8 | * Copyright (C) 1999-2000 Ian Jackson <ian@davenant.greenend.org.uk> |
| 9 | * |
| 10 | * It is part of adns, which is |
| 11 | * Copyright (C) 1997-2000,2003,2006,2014 Ian Jackson |
| 12 | * Copyright (C) 2014 Mark Wooding |
| 13 | * Copyright (C) 1999-2000,2003,2006 Tony Finch |
| 14 | * Copyright (C) 1991 Massachusetts Institute of Technology |
| 15 | * (See the file INSTALL for full details.) |
| 16 | * |
| 17 | * This program is free software; you can redistribute it and/or modify |
| 18 | * it under the terms of the GNU General Public License as published by |
| 19 | * the Free Software Foundation; either version 3, or (at your option) |
| 20 | * any later version. |
| 21 | * |
| 22 | * This program is distributed in the hope that it will be useful, |
| 23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 25 | * GNU General Public License for more details. |
| 26 | * |
| 27 | * You should have received a copy of the GNU General Public License |
| 28 | * along with this program; if not, write to the Free Software Foundation. |
| 29 | * |
| 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. |
| 33 | */ |
| 34 | |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/time.h> |
| 37 | |
| 38 | #include <unistd.h> |
| 39 | #include <string.h> |
| 40 | #include <stdlib.h> |
| 41 | #include <stdio.h> |
| 42 | #include <ctype.h> |
| 43 | #include <errno.h> |
| 44 | #include <stdarg.h> |
| 45 | |
| 46 | #include "config.h" |
| 47 | #include "adns.h" |
| 48 | #include "client.h" |
| 49 | |
| 50 | #ifdef ADNS_REGRESS_TEST |
| 51 | # include "hredirect.h" |
| 52 | #endif |
| 53 | |
| 54 | /* maximum number of concurrent DNS queries */ |
| 55 | #define MAXMAXPENDING 64000 |
| 56 | #define DEFMAXPENDING 2000 |
| 57 | |
| 58 | /* maximum length of a line */ |
| 59 | #define MAXLINE 1024 |
| 60 | |
| 61 | /* option flags */ |
| 62 | #define OPT_DEBUG 1 |
| 63 | #define OPT_POLL 2 |
| 64 | |
| 65 | static const char *const progname= "adnslogres"; |
| 66 | static const char *config_text; |
| 67 | |
| 68 | #define guard_null(str) ((str) ? (str) : "") |
| 69 | |
| 70 | #define sensible_ctype(type,ch) (type((unsigned char)(ch))) |
| 71 | /* isfoo() functions from ctype.h can't safely be fed char - blech ! */ |
| 72 | |
| 73 | static void msg(const char *fmt, ...) { |
| 74 | va_list al; |
| 75 | |
| 76 | fprintf(stderr, "%s: ", progname); |
| 77 | va_start(al,fmt); |
| 78 | vfprintf(stderr, fmt, al); |
| 79 | va_end(al); |
| 80 | fputc('\n',stderr); |
| 81 | } |
| 82 | |
| 83 | static void aargh(const char *cause) { |
| 84 | const char *why = strerror(errno); |
| 85 | if (!why) why = "Unknown error"; |
| 86 | msg("%s: %s (%d)", cause, why, errno); |
| 87 | exit(1); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Parse the IP address and convert to a reverse domain name. |
| 92 | */ |
| 93 | static char *ipaddr2domain(char *start, char **addr, char **rest) { |
| 94 | static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */ |
| 95 | char *ptrs[5]; |
| 96 | int i; |
| 97 | |
| 98 | ptrs[0]= start; |
| 99 | retry: |
| 100 | while (!sensible_ctype(isdigit,*ptrs[0])) |
| 101 | if (!*ptrs[0]++) { |
| 102 | strcpy(buf, "invalid."); |
| 103 | *addr= *rest= NULL; |
| 104 | return buf; |
| 105 | } |
| 106 | for (i= 1; i < 5; i++) { |
| 107 | ptrs[i]= ptrs[i-1]; |
| 108 | while (sensible_ctype(isdigit,*ptrs[i]++)); |
| 109 | if ((i == 4 && !sensible_ctype(isspace,ptrs[i][-1])) || |
| 110 | (i != 4 && ptrs[i][-1] != '.') || |
| 111 | (ptrs[i]-ptrs[i-1] > 4)) { |
| 112 | ptrs[0]= ptrs[i]-1; |
| 113 | goto retry; |
| 114 | } |
| 115 | } |
| 116 | sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.", |
| 117 | (int)(ptrs[4]-ptrs[3]-1), ptrs[3], |
| 118 | (int)(ptrs[3]-ptrs[2]-1), ptrs[2], |
| 119 | (int)(ptrs[2]-ptrs[1]-1), ptrs[1], |
| 120 | (int)(ptrs[1]-ptrs[0]-1), ptrs[0]); |
| 121 | *addr= ptrs[0]; |
| 122 | *rest= ptrs[4]-1; |
| 123 | return buf; |
| 124 | } |
| 125 | |
| 126 | static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) { |
| 127 | if (domain) |
| 128 | fprintf(outf, "%.*s%s%s", (int)(addr - start), start, domain, rest); |
| 129 | else |
| 130 | fputs(start, outf); |
| 131 | if (ferror(outf)) aargh("write output"); |
| 132 | } |
| 133 | |
| 134 | typedef struct logline { |
| 135 | struct logline *next; |
| 136 | char *start, *addr, *rest; |
| 137 | adns_query query; |
| 138 | } logline; |
| 139 | |
| 140 | static logline *readline(FILE *inf, adns_state adns, int opts) { |
| 141 | static char buf[MAXLINE]; |
| 142 | char *str; |
| 143 | logline *line; |
| 144 | |
| 145 | if (fgets(buf, MAXLINE, inf)) { |
| 146 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
| 147 | if (!str) aargh("malloc"); |
| 148 | line= (logline*)str; |
| 149 | line->next= NULL; |
| 150 | line->start= str+sizeof(logline); |
| 151 | strcpy(line->start, buf); |
| 152 | str= ipaddr2domain(line->start, &line->addr, &line->rest); |
| 153 | if (opts & OPT_DEBUG) |
| 154 | msg("submitting %.*s -> %s", (int)(line->rest-line->addr), guard_null(line->addr), str); |
| 155 | if (adns_submit(adns, str, adns_r_ptr, |
| 156 | adns_qf_quoteok_cname|adns_qf_cname_loose, |
| 157 | NULL, &line->query)) |
| 158 | aargh("adns_submit"); |
| 159 | return line; |
| 160 | } |
| 161 | if (!feof(inf)) |
| 162 | aargh("fgets"); |
| 163 | return NULL; |
| 164 | } |
| 165 | |
| 166 | static void proclog(FILE *inf, FILE *outf, int maxpending, int opts) { |
| 167 | int eof, err, len; |
| 168 | adns_state adns; |
| 169 | adns_answer *answer; |
| 170 | logline *head, *tail, *line; |
| 171 | adns_initflags initflags; |
| 172 | |
| 173 | initflags= (opts & OPT_DEBUG) ? adns_if_debug : 0; |
| 174 | if (config_text) { |
| 175 | errno= adns_init_strcfg(&adns, initflags, stderr, config_text); |
| 176 | } else { |
| 177 | errno= adns_init(&adns, initflags, 0); |
| 178 | } |
| 179 | if (errno) aargh("adns_init"); |
| 180 | head= tail= readline(inf, adns, opts); |
| 181 | len= 1; eof= 0; |
| 182 | while (head) { |
| 183 | while (head) { |
| 184 | if (opts & OPT_DEBUG) |
| 185 | msg("%d in queue; checking %.*s", len, |
| 186 | (int)(head->rest-head->addr), guard_null(head->addr)); |
| 187 | if (eof || len >= maxpending) { |
| 188 | if (opts & OPT_POLL) |
| 189 | err= adns_wait_poll(adns, &head->query, &answer, NULL); |
| 190 | else |
| 191 | err= adns_wait(adns, &head->query, &answer, NULL); |
| 192 | } else { |
| 193 | err= adns_check(adns, &head->query, &answer, NULL); |
| 194 | } |
| 195 | if (err == EAGAIN) break; |
| 196 | if (err) { |
| 197 | fprintf(stderr, "%s: adns_wait/check: %s", progname, strerror(err)); |
| 198 | exit(1); |
| 199 | } |
| 200 | printline(outf, head->start, head->addr, head->rest, |
| 201 | answer->status == adns_s_ok ? *answer->rrs.str : NULL); |
| 202 | line= head; head= head->next; |
| 203 | free(line); |
| 204 | free(answer); |
| 205 | len--; |
| 206 | } |
| 207 | if (!eof) { |
| 208 | line= readline(inf, adns, opts); |
| 209 | if (line) { |
| 210 | if (!head) head= line; |
| 211 | else tail->next= line; |
| 212 | tail= line; len++; |
| 213 | } else { |
| 214 | eof= 1; |
| 215 | } |
| 216 | } |
| 217 | } |
| 218 | adns_finish(adns); |
| 219 | } |
| 220 | |
| 221 | static void printhelp(FILE *file) { |
| 222 | fputs("usage: adnslogres [<options>] [<logfile>]\n" |
| 223 | " adnslogres --version|--help\n" |
| 224 | "options: -c <concurrency> set max number of outstanding queries\n" |
| 225 | " -p use poll(2) instead of select(2)\n" |
| 226 | " -d turn on debugging\n" |
| 227 | " -C <config> use instead of contents of resolv.conf\n", |
| 228 | stdout); |
| 229 | } |
| 230 | |
| 231 | static void usage(void) { |
| 232 | printhelp(stderr); |
| 233 | exit(1); |
| 234 | } |
| 235 | |
| 236 | int main(int argc, char *argv[]) { |
| 237 | int c, opts, maxpending; |
| 238 | extern char *optarg; |
| 239 | FILE *inf; |
| 240 | |
| 241 | if (argv[1] && !strncmp(argv[1],"--",2)) { |
| 242 | if (!strcmp(argv[1],"--help")) { |
| 243 | printhelp(stdout); |
| 244 | } else if (!strcmp(argv[1],"--version")) { |
| 245 | fputs(VERSION_MESSAGE("adnslogres"),stdout); |
| 246 | } else { |
| 247 | usage(); |
| 248 | } |
| 249 | if (ferror(stdout) || fclose(stdout)) { perror("stdout"); exit(1); } |
| 250 | exit(0); |
| 251 | } |
| 252 | |
| 253 | maxpending= DEFMAXPENDING; |
| 254 | opts= 0; |
| 255 | while ((c= getopt(argc, argv, "c:C:dp")) != -1) |
| 256 | switch (c) { |
| 257 | case 'c': |
| 258 | maxpending= atoi(optarg); |
| 259 | if (maxpending < 1 || maxpending > MAXMAXPENDING) { |
| 260 | fprintf(stderr, "%s: unfeasible concurrency %d\n", progname, maxpending); |
| 261 | exit(1); |
| 262 | } |
| 263 | break; |
| 264 | case 'C': |
| 265 | config_text= optarg; |
| 266 | break; |
| 267 | case 'd': |
| 268 | opts|= OPT_DEBUG; |
| 269 | break; |
| 270 | case 'p': |
| 271 | opts|= OPT_POLL; |
| 272 | break; |
| 273 | default: |
| 274 | usage(); |
| 275 | } |
| 276 | |
| 277 | argc-= optind; |
| 278 | argv+= optind; |
| 279 | |
| 280 | inf= NULL; |
| 281 | if (argc == 0) |
| 282 | inf= stdin; |
| 283 | else if (argc == 1) |
| 284 | inf= fopen(*argv, "r"); |
| 285 | else |
| 286 | usage(); |
| 287 | |
| 288 | if (!inf) |
| 289 | aargh("couldn't open input"); |
| 290 | |
| 291 | proclog(inf, stdout, maxpending, opts); |
| 292 | |
| 293 | if (fclose(inf)) |
| 294 | aargh("fclose input"); |
| 295 | if (fclose(stdout)) |
| 296 | aargh("fclose output"); |
| 297 | |
| 298 | return 0; |
| 299 | } |