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 31enum { 32 OPT_i = (1 << 0), 33}; 34 35static 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 (fgets(linebuf, sizeof(linebuf)-1, fp)) { 57 unsigned len; 58 59 len = strcspn(linebuf, "\r\n"); 60 linebuf[len++] = '\n'; 61 linebuf[len] = '\0'; 62 63 buf = xrealloc(buf, bufpos + len + 1); 64 memcpy(buf + bufpos, linebuf, len); 65 bufpos += len; 66 buf[bufpos] = '\0'; 67 68 if (!redir || !success) { 69 trim(linebuf); 70 str_tolower(linebuf); 71 if (!success) { 72 success = is_prefixed_with(linebuf, "domain:") 73 || is_prefixed_with(linebuf, "domain name:"); 74 } 75 else if (!redir) { 76 char *p = is_prefixed_with(linebuf, "whois server:"); 77 if (!p) 78 p = is_prefixed_with(linebuf, "whois:"); 79 if (p) 80 redir = xstrdup(skip_whitespace(p)); 81 } 82 } 83 } 84 fclose(fp); /* closes fd too */ 85 if (!success && !pfx[0]) { 86 /* 87 * Looking at /etc/jwhois.conf, some whois servers use 88 * "domain = DOMAIN", "DOMAIN ID <DOMAIN>" 89 * and "domain=DOMAIN_WITHOUT_LAST_COMPONENT" 90 * formats, but those are rare. 91 * (There are a few even more contrived ones.) 92 * We are trying only "domain DOMAIN", the typical one. 93 */ 94 pfx = "domain "; 95 bufpos = 0; 96 goto again; 97 } 98 99 /* Success */ 100 if (redir && strcmp(redir, host) == 0) { 101 /* Redirect to self does not count */ 102 free(redir); 103 redir = NULL; 104 } 105 if (!redir || (option_mask32 & OPT_i)) { 106 /* Output saved text */ 107 printf("[%s]\n%s", host, buf ? buf : ""); 108 } 109 free(buf); 110 return redir; 111} 112 113static void recursive_query(const char *host, int port, const char *domain) 114{ 115 char *free_me = NULL; 116 char *redir; 117 again: 118 redir = query(host, port, domain); 119 free(free_me); 120 if (redir) { 121 printf("[Redirected to %s]\n", redir); 122 host = free_me = redir; 123 port = 43; 124 goto again; 125 } 126} 127 128/* One of "big" whois implementations has these options: 129 * 130 * $ whois --help 131 * jwhois version 4.0, Copyright (C) 1999-2007 Free Software Foundation, Inc. 132 * -v, --verbose verbose debug output 133 * -c FILE, --config=FILE use FILE as configuration file 134 * -h HOST, --host=HOST explicitly query HOST 135 * -n, --no-redirect disable content redirection 136 * -s, --no-whoisservers disable whois-servers.net service support 137 * -a, --raw disable reformatting of the query 138 * -i, --display-redirections display all redirects instead of hiding them 139 * -p PORT, --port=PORT use port number PORT (in conjunction with HOST) 140 * -r, --rwhois force an rwhois query to be made 141 * --rwhois-display=DISPLAY sets the display option in rwhois queries 142 * --rwhois-limit=LIMIT sets the maximum number of matches to return 143 * 144 * Example of its output: 145 * $ whois cnn.com 146 * [Querying whois.verisign-grs.com] 147 * [Redirected to whois.corporatedomains.com] 148 * [Querying whois.corporatedomains.com] 149 * [whois.corporatedomains.com] 150 * ...text of the reply... 151 * 152 * With -i, reply from each server is printed, after all redirects are done: 153 * [Querying whois.verisign-grs.com] 154 * [Redirected to whois.corporatedomains.com] 155 * [Querying whois.corporatedomains.com] 156 * [whois.verisign-grs.com] 157 * ...text of the reply... 158 * [whois.corporatedomains.com] 159 * ...text of the reply... 160 * 161 * With -a, no "DOMAIN" -> "domain DOMAIN" transformation is attempted. 162 163 * With -n, the first reply is shown, redirects are not followed: 164 * [Querying whois.verisign-grs.com] 165 * [whois.verisign-grs.com] 166 * ...text of the reply... 167 */ 168 169int whois_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 170int whois_main(int argc UNUSED_PARAM, char **argv) 171{ 172 int port = 43; 173 const char *host = "whois.iana.org"; 174 175 getopt32(argv, "^" "ih:p:+" "\0" "-1", &host, &port); 176 argv += optind; 177 178 do { 179 recursive_query(host, port, *argv); 180 } 181 while (*++argv); 182 183 return EXIT_SUCCESS; 184} 185