busybox/networking/whois.c

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/* vi: set sw=4 ts=4: */
/*
* whois - tiny client for the whois directory service
*
* Copyright (c) 2011 Pere Orga <gotrunks@gmail.com>
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* TODO
* Add ipv6 support
* Add proxy support
*/
//config:config WHOIS
//config: bool "whois (6.6 kb)"
//config: default y
//config: help
//config: whois is a client for the whois directory service
//applet:IF_WHOIS(APPLET(whois, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_WHOIS) += whois.o
//usage:#define whois_trivial_usage
//usage: "[-i] [-h SERVER] [-p PORT] NAME..."
//usage:#define whois_full_usage "\n\n"
//usage: "Query WHOIS info about NAME\n"
//usage: "\n -i Show redirect results too"
//usage: "\n -h,-p Server to query"
#include "libbb.h"
enum {
OPT_i = (1 << 0),
};
static char *query(const char *host, int port, const char *domain)
{
int fd;
FILE *fp;
bool success;
char *redir = NULL;
const char *pfx = "";
/* some .io domains reported to have very long strings in whois
* responses, 1k was not enough:
*/
char linebuf[2 * 1024];
char *buf = NULL;
unsigned bufpos = 0;
again:
printf("[Querying %s:%d '%s%s']\n", host, port, pfx, domain);
fd = create_and_connect_stream_or_die(host, port);
fdprintf(fd, "%s%s\r\n", pfx, domain);
fp = xfdopen_for_read(fd);
success = 0;
while (fgets(linebuf, sizeof(linebuf)-1, fp)) {
unsigned len;
len = strcspn(linebuf, "\r\n");
linebuf[len++] = '\n';
linebuf[len] = '\0';
buf = xrealloc(buf, bufpos + len + 1);
memcpy(buf + bufpos, linebuf, len);
bufpos += len;
buf[bufpos] = '\0';
if (!redir || !success) {
trim(linebuf);
str_tolower(linebuf);
if (!success) {
success = is_prefixed_with(linebuf, "domain:")
|| is_prefixed_with(linebuf, "domain name:");
}
else if (!redir) {
char *p = is_prefixed_with(linebuf, "whois server:");
if (!p)
p = is_prefixed_with(linebuf, "whois:");
if (p)
redir = xstrdup(skip_whitespace(p));
}
}
}
fclose(fp); /* closes fd too */
if (!success && !pfx[0]) {
/*
* Looking at /etc/jwhois.conf, some whois servers use
* "domain = DOMAIN", "DOMAIN ID <DOMAIN>"
* and "domain=DOMAIN_WITHOUT_LAST_COMPONENT"
* formats, but those are rare.
* (There are a few even more contrived ones.)
* We are trying only "domain DOMAIN", the typical one.
*/
pfx = "domain ";
bufpos = 0;
goto again;
}
/* Success */
if (redir && strcmp(redir, host) == 0) {
/* Redirect to self does not count */
free(redir);
redir = NULL;
}
if (!redir || (option_mask32 & OPT_i)) {
/* Output saved text */
printf("[%s]\n%s", host, buf ? buf : "");
}
free(buf);
return redir;
}
static void recursive_query(const char *host, int port, const char *domain)
{
char *free_me = NULL;
char *redir;
again:
redir = query(host, port, domain);
free(free_me);
if (redir) {
printf("[Redirected to %s]\n", redir);
host = free_me = redir;
port = 43;
goto again;
}
}
/* One of "big" whois implementations has these options:
*
* $ whois --help
* jwhois version 4.0, Copyright (C) 1999-2007 Free Software Foundation, Inc.
* -v, --verbose verbose debug output
* -c FILE, --config=FILE use FILE as configuration file
* -h HOST, --host=HOST explicitly query HOST
* -n, --no-redirect disable content redirection
* -s, --no-whoisservers disable whois-servers.net service support
* -a, --raw disable reformatting of the query
* -i, --display-redirections display all redirects instead of hiding them
* -p PORT, --port=PORT use port number PORT (in conjunction with HOST)
* -r, --rwhois force an rwhois query to be made
* --rwhois-display=DISPLAY sets the display option in rwhois queries
* --rwhois-limit=LIMIT sets the maximum number of matches to return
*
* Example of its output:
* $ whois cnn.com
* [Querying whois.verisign-grs.com]
* [Redirected to whois.corporatedomains.com]
* [Querying whois.corporatedomains.com]
* [whois.corporatedomains.com]
* ...text of the reply...
*
* With -i, reply from each server is printed, after all redirects are done:
* [Querying whois.verisign-grs.com]
* [Redirected to whois.corporatedomains.com]
* [Querying whois.corporatedomains.com]
* [whois.verisign-grs.com]
* ...text of the reply...
* [whois.corporatedomains.com]
* ...text of the reply...
*
* With -a, no "DOMAIN" -> "domain DOMAIN" transformation is attempted.
* With -n, the first reply is shown, redirects are not followed:
* [Querying whois.verisign-grs.com]
* [whois.verisign-grs.com]
* ...text of the reply...
*/
int whois_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int whois_main(int argc UNUSED_PARAM, char **argv)
{
int port = 43;
const char *host = "whois.iana.org";
getopt32: remove opt_complementary function old new delta vgetopt32 1318 1392 +74 runsvdir_main 703 713 +10 bb_make_directory 423 425 +2 collect_cpu 546 545 -1 opt_chars 3 - -3 opt_complementary 4 - -4 tftpd_main 567 562 -5 ntp_init 476 471 -5 zcip_main 1266 1256 -10 xxd_main 428 418 -10 whois_main 140 130 -10 who_main 463 453 -10 which_main 212 202 -10 wget_main 2535 2525 -10 watchdog_main 291 281 -10 watch_main 222 212 -10 vlock_main 399 389 -10 uuencode_main 332 322 -10 uudecode_main 316 306 -10 unlink_main 45 35 -10 udhcpd_main 1482 1472 -10 udhcpc_main 2762 2752 -10 tune2fs_main 290 280 -10 tunctl_main 366 356 -10 truncate_main 218 208 -10 tr_main 518 508 -10 time_main 1134 1124 -10 tftp_main 286 276 -10 telnetd_main 1873 1863 -10 tcpudpsvd_main 1785 1775 -10 taskset_main 521 511 -10 tar_main 1009 999 -10 tail_main 1644 1634 -10 syslogd_main 1967 1957 -10 switch_root_main 368 358 -10 svlogd_main 1454 1444 -10 sv 1296 1286 -10 stat_main 104 94 -10 start_stop_daemon_main 1028 1018 -10 split_main 542 532 -10 sort_main 796 786 -10 slattach_main 624 614 -10 shuf_main 504 494 -10 setsid_main 96 86 -10 setserial_main 1132 1122 -10 setfont_main 388 378 -10 setconsole_main 78 68 -10 sendmail_main 1209 1199 -10 sed_main 677 667 -10 script_main 1077 1067 -10 run_parts_main 325 315 -10 rtcwake_main 454 444 -10 rm_main 175 165 -10 reformime_main 119 109 -10 readlink_main 123 113 -10 rdate_main 246 236 -10 pwdx_main 189 179 -10 pstree_main 317 307 -10 pscan_main 663 653 -10 popmaildir_main 818 808 -10 pmap_main 80 70 -10 nc_main 1042 1032 -10 mv_main 558 548 -10 mountpoint_main 477 467 -10 mount_main 1264 1254 -10 modprobe_main 768 758 -10 modinfo_main 333 323 -10 mktemp_main 200 190 -10 mkswap_main 324 314 -10 mkfs_vfat_main 1489 1479 -10 microcom_main 715 705 -10 md5_sha1_sum_main 521 511 -10 man_main 867 857 -10 makedevs_main 1052 1042 -10 ls_main 563 553 -10 losetup_main 432 422 -10 loadfont_main 89 79 -10 ln_main 524 514 -10 link_main 75 65 -10 ipcalc_main 544 534 -10 iostat_main 2397 2387 -10 install_main 768 758 -10 id_main 480 470 -10 i2cset_main 1239 1229 -10 i2cget_main 380 370 -10 i2cdump_main 1482 1472 -10 i2cdetect_main 682 672 -10 hwclock_main 406 396 -10 httpd_main 741 731 -10 grep_main 837 827 -10 getty_main 1559 1549 -10 fuser_main 297 287 -10 ftpgetput_main 345 335 -10 ftpd_main 2232 2222 -10 fstrim_main 251 241 -10 fsfreeze_main 77 67 -10 fsck_minix_main 2921 2911 -10 flock_main 314 304 -10 flashcp_main 740 730 -10 flash_eraseall_main 833 823 -10 fdformat_main 532 522 -10 expand_main 680 670 -10 eject_main 335 325 -10 dumpleases_main 630 620 -10 du_main 314 304 -10 dos2unix_main 441 431 -10 diff_main 1350 1340 -10 df_main 1064 1054 -10 date_main 1095 1085 -10 cut_main 961 951 -10 cryptpw_main 228 218 -10 crontab_main 575 565 -10 crond_main 1149 1139 -10 cp_main 370 360 -10 common_traceroute_main 3834 3824 -10 common_ping_main 1767 1757 -10 comm_main 239 229 -10 cmp_main 655 645 -10 chrt_main 379 369 -10 chpst_main 704 694 -10 chpasswd_main 308 298 -10 chown_main 171 161 -10 chmod_main 158 148 -10 cat_main 428 418 -10 bzip2_main 120 110 -10 blkdiscard_main 264 254 -10 base64_main 221 211 -10 arping_main 1665 1655 -10 ar_main 556 546 -10 adjtimex_main 406 396 -10 adduser_main 882 872 -10 addgroup_main 411 401 -10 acpid_main 1198 1188 -10 optstring 11 - -11 opt_string 18 - -18 OPT_STR 25 - -25 ubi_tools_main 1288 1258 -30 ls_options 31 - -31 ------------------------------------------------------------------------------ (add/remove: 0/6 grow/shrink: 3/129 up/down: 86/-1383) Total: -1297 bytes text data bss dec hex filename 915428 485 6876 922789 e14a5 busybox_old 914629 485 6872 921986 e1182 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-09 01:25:02 +05:30
getopt32(argv, "^" "ih:p:+" "\0" "-1", &host, &port);
argv += optind;
do {
recursive_query(host, port, *argv);
}
while (*++argv);
return EXIT_SUCCESS;
}