1 /* vi: set sw=4 ts=4: */
2 /*
3 * whois - tiny client for the whois directory service
4 *
5 * Copyright (c) 2011 Pere Orga <gotrunks@gmail.com>
6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
7 */
8 /* TODO
9 * Add ipv6 support
10 * Add proxy support
11 */
12 //config:config WHOIS
13 //config: bool "whois (6.3 kb)"
14 //config: default y
15 //config: help
16 //config: whois is a client for the whois directory service
17
18 //applet:IF_WHOIS(APPLET(whois, BB_DIR_USR_BIN, BB_SUID_DROP))
19
20 //kbuild:lib-$(CONFIG_WHOIS) += whois.o
21
22 //usage:#define whois_trivial_usage
23 //usage: "[-i] [-h SERVER] [-p PORT] NAME..."
24 //usage:#define whois_full_usage "\n\n"
25 //usage: "Query WHOIS info about NAME\n"
26 //usage: "\n -i Show redirect results too"
27 //usage: "\n -h,-p Server to query"
28
29 #include "libbb.h"
30
31 enum {
32 OPT_i = (1 << 0),
33 };
34
query(const char * host,int port,const char * domain)35 static char *query(const char *host, int port, const char *domain)
36 {
37 int fd;
38 FILE *fp;
39 bool success;
40 char *redir = NULL;
41 const char *pfx = "";
42 /* some .io domains reported to have very long strings in whois
43 * responses, 1k was not enough:
44 */
45 char linebuf[2 * 1024];
46 char *buf = NULL;
47 unsigned bufpos = 0;
48
49 again:
50 printf("[Querying %s:%d '%s%s']\n", host, port, pfx, domain);
51 fd = create_and_connect_stream_or_die(host, port);
52 fdprintf(fd, "%s%s\r\n", pfx, domain);
53 fp = xfdopen_for_read(fd);
54
55 success = 0;
56 while (bufpos < 32*1024 /* paranoia */
57 && fgets(linebuf, sizeof(linebuf)-1, fp)
58 ) {
59 unsigned len;
60
61 len = strcspn(linebuf, "\r\n");
62 linebuf[len++] = '\n';
63 linebuf[len] = '\0';
64
65 buf = xrealloc(buf, bufpos + len + 1);
66 memcpy(buf + bufpos, linebuf, len);
67 bufpos += len;
68 buf[bufpos] = '\0';
69
70 if (!redir || !success) {
71 trim(linebuf);
72 str_tolower(linebuf);
73 if (!success) {
74 success = is_prefixed_with(linebuf, "domain:")
75 || is_prefixed_with(linebuf, "domain name:");
76 }
77 else if (!redir) {
78 char *p = is_prefixed_with(linebuf, "whois server:");
79 if (!p)
80 p = is_prefixed_with(linebuf, "whois:");
81 if (p)
82 redir = xstrdup(skip_whitespace(p));
83 }
84 }
85 }
86 fclose(fp); /* closes fd too */
87 if (!success && !pfx[0]) {
88 /*
89 * Looking at /etc/jwhois.conf, some whois servers use
90 * "domain = DOMAIN", "DOMAIN ID <DOMAIN>"
91 * and "domain=DOMAIN_WITHOUT_LAST_COMPONENT"
92 * formats, but those are rare.
93 * (There are a few even more contrived ones.)
94 * We are trying only "domain DOMAIN", the typical one.
95 */
96 pfx = "domain ";
97 bufpos = 0;
98 goto again;
99 }
100
101 /* Success */
102 if (redir && strcmp(redir, host) == 0) {
103 /* Redirect to self does not count */
104 free(redir);
105 redir = NULL;
106 }
107 if (!redir || (option_mask32 & OPT_i)) {
108 /* Output saved text */
109 printf("[%s]\n%s", host, buf ? buf : "");
110 }
111 free(buf);
112 return redir;
113 }
114
recursive_query(const char * host,int port,const char * domain)115 static void recursive_query(const char *host, int port, const char *domain)
116 {
117 char *free_me = NULL;
118 char *redir;
119 again:
120 redir = query(host, port, domain);
121 free(free_me);
122 if (redir) {
123 printf("[Redirected to %s]\n", redir);
124 host = free_me = redir;
125 port = 43;
126 goto again;
127 }
128 }
129
130 /* One of "big" whois implementations has these options:
131 *
132 * $ whois --help
133 * jwhois version 4.0, Copyright (C) 1999-2007 Free Software Foundation, Inc.
134 * -v, --verbose verbose debug output
135 * -c FILE, --config=FILE use FILE as configuration file
136 * -h HOST, --host=HOST explicitly query HOST
137 * -n, --no-redirect disable content redirection
138 * -s, --no-whoisservers disable whois-servers.net service support
139 * -a, --raw disable reformatting of the query
140 * -i, --display-redirections display all redirects instead of hiding them
141 * -p PORT, --port=PORT use port number PORT (in conjunction with HOST)
142 * -r, --rwhois force an rwhois query to be made
143 * --rwhois-display=DISPLAY sets the display option in rwhois queries
144 * --rwhois-limit=LIMIT sets the maximum number of matches to return
145 *
146 * Example of its output:
147 * $ whois cnn.com
148 * [Querying whois.verisign-grs.com]
149 * [Redirected to whois.corporatedomains.com]
150 * [Querying whois.corporatedomains.com]
151 * [whois.corporatedomains.com]
152 * ...text of the reply...
153 *
154 * With -i, reply from each server is printed, after all redirects are done:
155 * [Querying whois.verisign-grs.com]
156 * [Redirected to whois.corporatedomains.com]
157 * [Querying whois.corporatedomains.com]
158 * [whois.verisign-grs.com]
159 * ...text of the reply...
160 * [whois.corporatedomains.com]
161 * ...text of the reply...
162 *
163 * With -a, no "DOMAIN" -> "domain DOMAIN" transformation is attempted.
164
165 * With -n, the first reply is shown, redirects are not followed:
166 * [Querying whois.verisign-grs.com]
167 * [whois.verisign-grs.com]
168 * ...text of the reply...
169 */
170
171 int whois_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
whois_main(int argc UNUSED_PARAM,char ** argv)172 int whois_main(int argc UNUSED_PARAM, char **argv)
173 {
174 int port = 43;
175 const char *host = "whois.iana.org";
176
177 getopt32(argv, "^" "ih:p:+" "\0" "-1", &host, &port);
178 argv += optind;
179
180 do {
181 recursive_query(host, port, *argv);
182 }
183 while (*++argv);
184
185 return EXIT_SUCCESS;
186 }
187