| 1 | /* |
| 2 | * adnslogres.c |
| 3 | * - a replacement for the Apache logresolve program using adns |
| 4 | */ |
| 5 | /* |
| 6 | * This file is |
| 7 | * Copyright (C) 1999 Tony Finch <dot@dotat.at> |
| 8 | * Copyright (C) 1999 Ian Jackson <ian@davenant.greenend.org.uk> |
| 9 | * |
| 10 | * It is part of adns, which is |
| 11 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
| 12 | * Copyright (C) 1999 Tony Finch <dot@dotat.at> |
| 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, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | * |
| 28 | * This version was originally supplied by Tony Finch, but has been |
| 29 | * modified by Ian Jackson as it was incorporated into adns. |
| 30 | */ |
| 31 | |
| 32 | static const char * const cvsid = |
| 33 | "$Id$"; |
| 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 | |
| 45 | #include "adns.h" |
| 46 | |
| 47 | /* maximum number of concurrent DNS queries */ |
| 48 | #define MAXPENDING 1000 |
| 49 | |
| 50 | /* maximum length of a line */ |
| 51 | #define MAXLINE 1024 |
| 52 | |
| 53 | /* option flags */ |
| 54 | #define OPT_DEBUG 1 |
| 55 | #define OPT_POLL 2 |
| 56 | |
| 57 | static const char *progname; |
| 58 | |
| 59 | #define msg(fmt, args...) fprintf(stderr, "%s: " fmt "\n", progname, ##args) |
| 60 | |
| 61 | static void aargh(const char *cause) { |
| 62 | const char *why = strerror(errno); |
| 63 | if (!why) why = "Unknown error"; |
| 64 | msg("%s: %s (%d)", cause, why, errno); |
| 65 | exit(1); |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Parse the IP address and convert to a reverse domain name. |
| 70 | */ |
| 71 | static char *ipaddr2domain(char *start, char **addr, char **rest) { |
| 72 | static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */ |
| 73 | char *ptrs[5]; |
| 74 | int i; |
| 75 | |
| 76 | ptrs[0]= start; |
| 77 | retry: |
| 78 | while (!isdigit(*ptrs[0])) |
| 79 | if (!*ptrs[0]++) { |
| 80 | strcpy(buf, "invalid."); |
| 81 | *addr= *rest= NULL; |
| 82 | return buf; |
| 83 | } |
| 84 | for (i= 1; i < 5; i++) { |
| 85 | ptrs[i]= ptrs[i-1]; |
| 86 | while (isdigit(*ptrs[i]++)); |
| 87 | if ((i == 4 && !isspace(ptrs[i][-1])) || |
| 88 | (i != 4 && ptrs[i][-1] != '.') || |
| 89 | (ptrs[i]-ptrs[i-1] > 4)) { |
| 90 | ptrs[0]= ptrs[i]-1; |
| 91 | goto retry; |
| 92 | } |
| 93 | } |
| 94 | sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.", |
| 95 | ptrs[4]-ptrs[3]-1, ptrs[3], |
| 96 | ptrs[3]-ptrs[2]-1, ptrs[2], |
| 97 | ptrs[2]-ptrs[1]-1, ptrs[1], |
| 98 | ptrs[1]-ptrs[0]-1, ptrs[0]); |
| 99 | *addr= ptrs[0]; |
| 100 | *rest= ptrs[4]-1; |
| 101 | return buf; |
| 102 | } |
| 103 | |
| 104 | static void printline(FILE *outf, char *start, char *addr, char *rest, char *domain) { |
| 105 | if (domain) |
| 106 | fprintf(outf, "%.*s%s%s", addr - start, start, domain, rest); |
| 107 | else |
| 108 | fputs(start, outf); |
| 109 | if (ferror(outf)) aargh("write output"); |
| 110 | } |
| 111 | |
| 112 | typedef struct logline { |
| 113 | struct logline *next; |
| 114 | char *start, *addr, *rest; |
| 115 | adns_query query; |
| 116 | } logline; |
| 117 | |
| 118 | static logline *readline(FILE *inf, adns_state adns, int opts) { |
| 119 | static char buf[MAXLINE]; |
| 120 | char *str; |
| 121 | logline *line; |
| 122 | |
| 123 | if (fgets(buf, MAXLINE, inf)) { |
| 124 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
| 125 | if (!str) aargh("malloc"); |
| 126 | line= (logline*)str; |
| 127 | line->next= NULL; |
| 128 | line->start= str+sizeof(logline); |
| 129 | strcpy(line->start, buf); |
| 130 | str= ipaddr2domain(line->start, &line->addr, &line->rest); |
| 131 | if (opts & OPT_DEBUG) |
| 132 | msg("submitting %.*s -> %s", line->rest-line->addr, line->addr, str); |
| 133 | if (adns_submit(adns, str, adns_r_ptr, |
| 134 | adns_qf_quoteok_cname|adns_qf_cname_loose, |
| 135 | NULL, &line->query)) |
| 136 | aargh("adns_submit"); |
| 137 | return line; |
| 138 | } |
| 139 | if (!feof(inf)) |
| 140 | aargh("fgets"); |
| 141 | return NULL; |
| 142 | } |
| 143 | |
| 144 | static void proclog(FILE *inf, FILE *outf, int opts) { |
| 145 | int eof, err, len; |
| 146 | adns_state adns; |
| 147 | adns_answer *answer; |
| 148 | logline *head, *tail, *line; |
| 149 | |
| 150 | errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0); |
| 151 | if (errno) aargh("adns_init"); |
| 152 | head= tail= readline(inf, adns, opts); |
| 153 | len= 1; eof= 0; |
| 154 | while (head) { |
| 155 | if (opts & OPT_DEBUG) |
| 156 | msg("%d in queue; checking %.*s", len, |
| 157 | head->rest-head->addr, head->addr); |
| 158 | if (eof || len > MAXPENDING) |
| 159 | if (opts & OPT_POLL) |
| 160 | err= adns_wait_poll(adns, &head->query, &answer, NULL); |
| 161 | else |
| 162 | err= adns_wait(adns, &head->query, &answer, NULL); |
| 163 | else |
| 164 | err= adns_check(adns, &head->query, &answer, NULL); |
| 165 | if (err != EAGAIN) { |
| 166 | printline(outf, head->start, head->addr, head->rest, |
| 167 | answer->status == adns_s_ok ? *answer->rrs.str : NULL); |
| 168 | line= head; head= head->next; |
| 169 | free(line); free(answer); |
| 170 | len--; |
| 171 | } |
| 172 | if (!eof) { |
| 173 | line= readline(inf, adns, opts); |
| 174 | if (!line) |
| 175 | eof= 1; |
| 176 | else { |
| 177 | if (!head) |
| 178 | head= line; |
| 179 | else |
| 180 | tail->next= line; |
| 181 | tail= line; |
| 182 | len++; |
| 183 | } |
| 184 | } |
| 185 | } |
| 186 | adns_finish(adns); |
| 187 | } |
| 188 | |
| 189 | static void usage(void) { |
| 190 | fprintf(stderr, "usage: %s [-d] [-p] [logfile]\n", progname); |
| 191 | exit(1); |
| 192 | } |
| 193 | |
| 194 | int main(int argc, char *argv[]) { |
| 195 | int c, opts; |
| 196 | FILE *inf; |
| 197 | |
| 198 | progname= strrchr(*argv, '/'); |
| 199 | if (progname) |
| 200 | progname++; |
| 201 | else |
| 202 | progname= *argv; |
| 203 | opts= 0; |
| 204 | |
| 205 | while ((c= getopt(argc, argv, "dp")) != -1) |
| 206 | switch (c) { |
| 207 | case 'd': |
| 208 | opts|= OPT_DEBUG; |
| 209 | break; |
| 210 | case 'p': |
| 211 | opts|= OPT_POLL; |
| 212 | break; |
| 213 | default: |
| 214 | usage(); |
| 215 | } |
| 216 | |
| 217 | argc-= optind; |
| 218 | argv+= optind; |
| 219 | |
| 220 | inf= NULL; |
| 221 | if (argc == 0) |
| 222 | inf= stdin; |
| 223 | else if (argc == 1) |
| 224 | inf= fopen(*argv, "r"); |
| 225 | else |
| 226 | usage(); |
| 227 | |
| 228 | if (!inf) |
| 229 | aargh("couldn't open input"); |
| 230 | |
| 231 | proclog(inf, stdout, opts); |
| 232 | |
| 233 | if (fclose(inf)) |
| 234 | aargh("fclose input"); |
| 235 | if (fclose(stdout)) |
| 236 | aargh("fclose output"); |
| 237 | |
| 238 | return 0; |
| 239 | } |