81453aec |
1 | /* |
2 | * adnslogres.c |
3 | * - a replacement for the Apache logresolve program using adns |
4 | */ |
5 | /* |
23d78b27 |
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> |
81453aec |
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, |
23d78b27 |
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. |
81453aec |
26 | */ |
27 | |
28 | static const char * const cvsid = |
29 | "$Id$"; |
30 | |
31 | #include <sys/types.h> |
32 | #include <sys/time.h> |
33 | |
34 | #include <string.h> |
35 | #include <stdlib.h> |
36 | #include <stdio.h> |
37 | #include <ctype.h> |
38 | #include <errno.h> |
39 | |
40 | #include "adns.h" |
41 | |
42 | /* maximum number of concurrent DNS queries */ |
43 | #define MAXPENDING 1000 |
44 | |
45 | /* maximum length of a line */ |
46 | #define MAXLINE 1024 |
47 | |
48 | static const char *progname; |
49 | |
50 | static void aargh(const char *msg) { |
51 | fprintf(stderr, "%s: %s: %s (%d)\n", progname, msg, |
52 | strerror(errno) ? strerror(errno) : "Unknown error", errno); |
53 | exit(1); |
54 | } |
55 | |
56 | /* |
57 | * Parse the IP address and convert to a reverse domain name. |
58 | */ |
59 | static void ipaddr2domain(char *start, char **addr, char **rest, char **domain) { |
60 | static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */ |
61 | char *ptrs[5]; |
62 | int i; |
63 | |
64 | for (ptrs[0]= start; !isdigit(*ptrs[0]); ptrs[0]++) |
65 | if (!*ptrs[0]) |
66 | goto invalid; |
67 | for (i= 1; i < 5; i ++) { |
68 | ptrs[i]= strchr(ptrs[i-1], (i == 4) ? ' ' : '.'); |
69 | if (!ptrs[i] || ptrs[i]-ptrs[i-1] > 3) |
70 | goto invalid; |
71 | else |
72 | ptrs[i]++; |
73 | } |
74 | sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.", |
75 | ptrs[4]-ptrs[3]-1, ptrs[3], |
76 | ptrs[3]-ptrs[2]-1, ptrs[2], |
77 | ptrs[2]-ptrs[1]-1, ptrs[1], |
78 | ptrs[1]-ptrs[0]-1, ptrs[0]); |
79 | *addr= ptrs[0]; |
80 | *rest= ptrs[4]-1; |
81 | *domain= buf; |
82 | return; |
83 | invalid: |
84 | strcpy(buf, "invalid."); |
85 | *addr= *rest= NULL; |
86 | *domain= buf; |
87 | return; |
88 | } |
89 | |
90 | static void printline(char *start, char *addr, char *rest, char *domain) { |
91 | if (domain) |
92 | printf("%.*s%s%s", addr - start, start, domain, rest); |
93 | else |
94 | fputs(start, stdout); |
23d78b27 |
95 | if (ferror(stdout)) aargh("write output"); |
81453aec |
96 | } |
97 | |
98 | typedef struct logline { |
99 | struct logline *next; |
100 | char *start, *addr, *rest; |
101 | adns_query query; |
102 | } logline; |
103 | |
104 | static logline *readline(adns_state adns) { |
105 | static char buf[MAXLINE]; |
106 | char *str; |
107 | logline *line; |
108 | |
109 | if (fgets(buf, MAXLINE, stdin)) { |
110 | str= malloc(sizeof(*line) + strlen(buf) + 1); |
111 | if (!str) aargh("malloc"); |
112 | line= (logline*)str; |
113 | line->next= NULL; |
114 | line->start= str+sizeof(logline); |
115 | strcpy(line->start, buf); |
116 | ipaddr2domain(line->start, &line->addr, &line->rest, &str); |
117 | if (adns_submit(adns, str, adns_r_ptr, |
118 | adns_qf_quoteok_cname|adns_qf_cname_loose, |
119 | NULL, &line->query)) |
120 | aargh("adns_submit"); |
121 | return line; |
122 | } |
123 | if (!feof(stdin)) |
124 | aargh("fgets"); |
125 | return NULL; |
126 | } |
127 | |
128 | static void proclog(void) { |
129 | int eof, err, len; |
130 | adns_state adns; |
131 | adns_answer *answer; |
132 | logline *head, *tail, *line; |
133 | |
134 | errno= adns_init(&adns, 0, 0); |
135 | if (errno) aargh("adns_init"); |
136 | head= tail= readline(adns); |
137 | len= 1; eof= 0; |
138 | while (head) { |
139 | if (eof || len > MAXPENDING) |
140 | err= adns_wait(adns, &head->query, &answer, NULL); |
141 | else |
142 | err= adns_check(adns, &head->query, &answer, NULL); |
143 | if (err != EWOULDBLOCK) { |
144 | printline(head->start, head->addr, head->rest, |
145 | answer->status == adns_s_ok ? *answer->rrs.str : NULL); |
146 | line= head; head= head->next; |
147 | free(line); free(answer); |
148 | len--; |
149 | } |
150 | if (!eof) { |
151 | line= readline(adns); |
152 | if (!line) |
153 | eof= 1; |
154 | else { |
155 | if (!head) |
156 | head = line; |
157 | else |
158 | tail->next = line; |
159 | tail = line; |
160 | len++; |
161 | } |
162 | } |
163 | } |
164 | adns_finish(adns); |
165 | } |
166 | |
23d78b27 |
167 | int main(int argc, char *argv[]) { |
81453aec |
168 | progname= *argv; |
169 | proclog(); |
23d78b27 |
170 | if (fclose(stdout)) aargh("finish writing output"); |
81453aec |
171 | return 0; |
172 | } |