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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 |
7 | * Copyright (C) 1999 Tony Finch <fanf@demon.net> <dot@dotat.at> |
8 | * Copyright (C) 1999 Ian Jackson <ian@davenant.greenend.org.uk> |
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9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2, or (at your option) |
13 | * any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software Foundation, |
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22 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
23 | * |
24 | * This version was originally supplied by Tony Finch, but has been |
25 | * modified by Ian Jackson as it was incorporated into adns. |
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26 | */ |
27 | |
28 | static const char * const cvsid = |
29 | "$Id$"; |
30 | |
31 | #include <sys/types.h> |
32 | #include <sys/time.h> |
33 | |
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34 | #include <unistd.h> |
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35 | #include <string.h> |
36 | #include <stdlib.h> |
37 | #include <stdio.h> |
38 | #include <ctype.h> |
39 | #include <errno.h> |
40 | |
41 | #include "adns.h" |
42 | |
43 | /* maximum number of concurrent DNS queries */ |
44 | #define MAXPENDING 1000 |
45 | |
46 | /* maximum length of a line */ |
47 | #define MAXLINE 1024 |
48 | |
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49 | /* option flags */ |
50 | #define OPT_DEBUG 1 |
51 | #define OPT_POLL 2 |
52 | |
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53 | static const char *progname; |
54 | |
55 | static void aargh(const char *msg) { |
56 | fprintf(stderr, "%s: %s: %s (%d)\n", progname, msg, |
57 | strerror(errno) ? strerror(errno) : "Unknown error", errno); |
58 | exit(1); |
59 | } |
60 | |
61 | /* |
62 | * Parse the IP address and convert to a reverse domain name. |
63 | */ |
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64 | static char *ipaddr2domain(char *start, char **addr, char **rest) { |
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65 | static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */ |
66 | char *ptrs[5]; |
67 | int i; |
68 | |
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69 | ptrs[0]= start; |
70 | retry: |
71 | while (!isdigit(*ptrs[0])) |
72 | if (!*ptrs[0]++) { |
73 | strcpy(buf, "invalid."); |
74 | *addr= *rest= NULL; |
75 | return buf; |
76 | } |
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77 | for (i= 1; i < 5; i ++) { |
78 | ptrs[i]= strchr(ptrs[i-1], (i == 4) ? ' ' : '.'); |
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79 | if (!ptrs[i] || ptrs[i]-ptrs[i-1] > 3) { |
80 | ptrs[0]++; |
81 | goto retry; |
82 | } else |
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83 | ptrs[i]++; |
84 | } |
85 | sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.", |
86 | ptrs[4]-ptrs[3]-1, ptrs[3], |
87 | ptrs[3]-ptrs[2]-1, ptrs[2], |
88 | ptrs[2]-ptrs[1]-1, ptrs[1], |
89 | ptrs[1]-ptrs[0]-1, ptrs[0]); |
90 | *addr= ptrs[0]; |
91 | *rest= ptrs[4]-1; |
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92 | return buf; |
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93 | } |
94 | |
95 | static void printline(char *start, char *addr, char *rest, char *domain) { |
96 | if (domain) |
97 | printf("%.*s%s%s", addr - start, start, domain, rest); |
98 | else |
99 | fputs(start, stdout); |
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100 | if (ferror(stdout)) aargh("write output"); |
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101 | } |
102 | |
103 | typedef struct logline { |
104 | struct logline *next; |
105 | char *start, *addr, *rest; |
106 | adns_query query; |
107 | } logline; |
108 | |
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109 | static logline *readline(adns_state adns, int opts) { |
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110 | static char buf[MAXLINE]; |
111 | char *str; |
112 | logline *line; |
113 | |
114 | if (fgets(buf, MAXLINE, stdin)) { |
115 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
116 | if (!str) aargh("malloc"); |
117 | line= (logline*)str; |
118 | line->next= NULL; |
119 | line->start= str+sizeof(logline); |
120 | strcpy(line->start, buf); |
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121 | str = ipaddr2domain(line->start, &line->addr, &line->rest); |
122 | if (opts & OPT_DEBUG) |
123 | fprintf(stderr, "%s: adns_submit %s\n", progname, str); |
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124 | if (adns_submit(adns, str, adns_r_ptr, |
125 | adns_qf_quoteok_cname|adns_qf_cname_loose, |
126 | NULL, &line->query)) |
127 | aargh("adns_submit"); |
128 | return line; |
129 | } |
130 | if (!feof(stdin)) |
131 | aargh("fgets"); |
132 | return NULL; |
133 | } |
134 | |
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135 | static void proclog(int opts) { |
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136 | int eof, err, len; |
137 | adns_state adns; |
138 | adns_answer *answer; |
139 | logline *head, *tail, *line; |
140 | |
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141 | errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0); |
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142 | if (errno) aargh("adns_init"); |
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143 | head= tail= readline(adns, opts); |
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144 | len= 1; eof= 0; |
145 | while (head) { |
146 | if (eof || len > MAXPENDING) |
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147 | if (opts & OPT_POLL) |
148 | err= adns_wait_poll(adns, &head->query, &answer, NULL); |
149 | else |
150 | err= adns_wait(adns, &head->query, &answer, NULL); |
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151 | else |
152 | err= adns_check(adns, &head->query, &answer, NULL); |
153 | if (err != EWOULDBLOCK) { |
154 | printline(head->start, head->addr, head->rest, |
155 | answer->status == adns_s_ok ? *answer->rrs.str : NULL); |
156 | line= head; head= head->next; |
157 | free(line); free(answer); |
158 | len--; |
159 | } |
160 | if (!eof) { |
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161 | line= readline(adns, opts); |
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162 | if (!line) |
163 | eof= 1; |
164 | else { |
165 | if (!head) |
166 | head = line; |
167 | else |
168 | tail->next = line; |
169 | tail = line; |
170 | len++; |
171 | } |
172 | } |
173 | } |
174 | adns_finish(adns); |
175 | } |
176 | |
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177 | int main(int argc, char *argv[]) { |
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178 | int c, opts; |
179 | |
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180 | progname= *argv; |
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181 | opts= 0; |
182 | |
183 | while ((c= getopt(argc, argv, "dp")) != -1) { |
184 | switch (c) { |
185 | case 'd': |
186 | opts |= OPT_DEBUG; |
187 | break; |
188 | case 'p': |
189 | opts |= OPT_POLL; |
190 | break; |
191 | default: |
192 | fprintf(stderr, "usage: %s [-d] < logfile\n", progname); |
193 | exit(1); |
194 | } |
195 | argc-= optind; |
196 | argv+= optind; |
197 | } |
198 | |
199 | proclog(opts); |
200 | |
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201 | if (fclose(stdout)) aargh("finish writing output"); |
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202 | return 0; |
203 | } |