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authorDenys Vlasenko2016-07-06 15:45:41 +0200
committerDenys Vlasenko2016-07-06 15:45:41 +0200
commit1035c92e2d1c017eab7cb10badb7e3b407aeba2d (patch)
treee4e3dc6b3c136196aad1d27db28b846b977b5037 /networking
parentf4f8fe841cf2df761eaade204a13e6fde6639666 (diff)
downloadbusybox-1035c92e2d1c017eab7cb10badb7e3b407aeba2d.zip
busybox-1035c92e2d1c017eab7cb10badb7e3b407aeba2d.tar.gz
whois: make it actually work
It was doing way too simplistic work of just querying the server, no redirects, no query massaging. This required user to know a lot about whois, and enter at least three queries for each host to get meaningful information. function old new delta whois_main 209 646 +437 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking')
-rw-r--r--networking/whois.c137
1 files changed, 124 insertions, 13 deletions
diff --git a/networking/whois.c b/networking/whois.c
index bf33033..5ef8367 100644
--- a/networking/whois.c
+++ b/networking/whois.c
@@ -28,36 +28,147 @@
#include "libbb.h"
-static void pipe_out(int fd)
+static char *query(const char *host, int port, const char *domain)
{
+ int fd;
FILE *fp;
- char buf[1024];
+ bool success;
+ char *redir = NULL;
+ const char *pfx = "";
+ char linebuf[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);
+ success = 0;
+ fdprintf(fd, "%s%s\r\n", pfx, domain);
fp = xfdopen_for_read(fd);
- while (fgets(buf, sizeof(buf), fp)) {
- char *p = strpbrk(buf, "\r\n");
- if (p)
- *p = '\0';
- puts(buf);
- }
+ while (fgets(linebuf, sizeof(linebuf), fp)) {
+ unsigned len = strcspn(linebuf, "\r\n");
+ linebuf[len++] = '\n';
+
+ buf = xrealloc(buf, bufpos + len + 1);
+ memcpy(buf + bufpos, linebuf, len);
+ bufpos += len;
+
+ 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 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) {
+ /* Output saved text */
+ printf("[%s]\n", host);
+ buf[bufpos] = '\0';
+ fputs(buf, stdout);
+ }
+ 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-servers.net";
+ const char *host = "whois.iana.org";
opt_complementary = "-1:p+";
getopt32(argv, "h:p:", &host, &port);
-
argv += optind;
+
do {
- int fd = create_and_connect_stream_or_die(host, port);
- fdprintf(fd, "%s\r\n", *argv);
- pipe_out(fd);
+ recursive_query(host, port, *argv);
}
while (*++argv);