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9c36367eea
see http://seclists.org/nmap-dev/2013/q4/168 Move some includes out of nmap.h: nmap.h gets included lots of places, and unconditionally included math.h, ctype.h, errno.h, stdio.h, sys/stat.h, fcntl.h, sys/types.h, and stdarg.h. This commit moves those includes into the .cc files where they are necessary and out of nmap.h Remove redundant include global_structures.h, included from nmap.h Removed redundant code included from nmap.h Removing #include nbase.h when nmap.h is included (redundant) Remove duplicate #include lines Add ifndef guards to a few .h files
263 lines
10 KiB
C
263 lines
10 KiB
C
/***************************************************************************
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* nsock_telnet.c -- A simple "telnet" client -- a trivial example of *
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* using the nsock parallel socket event library *
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* *
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***********************IMPORTANT NSOCK LICENSE TERMS***********************
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* *
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* The nsock parallel socket event library is (C) 1999-2013 Insecure.Com *
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* LLC This library is free software; you may redistribute and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; Version 2. This guarantees *
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* your right to use, modify, and redistribute this software under certain *
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* conditions. If this license is unacceptable to you, Insecure.Com LLC *
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* may be willing to sell alternative licenses (contact *
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* sales@insecure.com ). *
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* *
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* As a special exception to the GPL terms, Insecure.Com LLC grants *
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* permission to link the code of this program with any version of the *
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* OpenSSL library which is distributed under a license identical to that *
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* listed in the included docs/licenses/OpenSSL.txt file, and distribute *
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* linked combinations including the two. You must obey the GNU GPL in all *
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* respects for all of the code used other than OpenSSL. If you modify *
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* this file, you may extend this exception to your version of the file, *
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* but you are not obligated to do so. *
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* *
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* If you received these files with a written license agreement stating *
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* terms other than the (GPL) terms above, then that alternative license *
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* agreement takes precedence over this comment. *
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* *
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* Source is provided to this software because we believe users have a *
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* right to know exactly what a program is going to do before they run it. *
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* This also allows you to audit the software for security holes (none *
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* have been found so far). *
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* *
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* Source code also allows you to port Nmap to new platforms, fix bugs, *
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* and add new features. You are highly encouraged to send your changes *
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* to the dev@nmap.org mailing list for possible incorporation into the *
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* main distribution. By sending these changes to Fyodor or one of the *
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* Insecure.Org development mailing lists, or checking them into the Nmap *
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* source code repository, it is understood (unless you specify otherwise) *
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* that you are offering the Nmap Project (Insecure.Com LLC) the *
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* unlimited, non-exclusive right to reuse, modify, and relicense the *
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* code. Nmap will always be available Open Source, but this is important *
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* because the inability to relicense code has caused devastating problems *
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* for other Free Software projects (such as KDE and NASM). We also *
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* occasionally relicense the code to third parties as discussed above. *
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* If you wish to specify special license conditions of your *
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* contributions, just say so when you send them. *
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* *
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* This program is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License v2.0 for more details *
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* (http://www.gnu.org/licenses/gpl-2.0.html). *
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* *
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***************************************************************************/
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#include "nsock.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include <sys/time.h>
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#include <openssl/ssl.h>
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#include <openssl/err.h>
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/* #include <nbase.h> */
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/* from nbase.h */
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int socket_errno();
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extern char *optarg;
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extern int optind;
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struct telnet_state {
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nsock_iod tcp_nsi;
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nsock_iod stdin_nsi;
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nsock_event_id latest_readtcpev;
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nsock_event_id latest_readstdinev;
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void *ssl_session;
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};
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/* Tries to resolve given hostname and stores
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result in ip . returns 0 if hostname cannot
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be resolved */
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int resolve(char *hostname, struct in_addr *ip) {
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struct hostent *h;
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if (!hostname || !*hostname) {
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fprintf(stderr, "NULL or zero-length hostname passed to resolve(). Quitting.\n");
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exit(1);
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}
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if (inet_aton(hostname, ip))
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return 1; /* damn, that was easy ;) */
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if ((h = gethostbyname(hostname))) {
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memcpy(ip, h->h_addr_list[0], sizeof(struct in_addr));
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return 1;
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}
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return 0;
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}
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void telnet_event_handler(nsock_pool nsp, nsock_event nse, void *mydata) {
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nsock_iod nsi = nse_iod(nse);
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enum nse_status status = nse_status(nse);
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enum nse_type type = nse_type(nse);
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struct sockaddr_in peer;
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struct telnet_state *ts;
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int nbytes;
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char *str;
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int read_timeout = -1;
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int write_timeout = 2000;
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ts = (struct telnet_state *)mydata;
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printf("telnet_event_handler: Received callback of type %s with status %s\n", nse_type2str(type), nse_status2str(status));
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if (status == NSE_STATUS_SUCCESS) {
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switch (type) {
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case NSE_TYPE_CONNECT:
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case NSE_TYPE_CONNECT_SSL:
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nsi_getlastcommunicationinfo(nsi, NULL, NULL, NULL, (struct sockaddr *)&peer, sizeof peer);
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printf("Successfully connected %sto %s:%hu -- start typing lines\n", (type == NSE_TYPE_CONNECT_SSL) ? "(SSL!) " : "", inet_ntoa(peer.sin_addr), peer.sin_port);
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/* First of all, lets add STDIN to our list of watched filehandles */
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if ((ts->stdin_nsi = nsi_new2(nsp, STDIN_FILENO, NULL)) == NULL) {
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fprintf(stderr, "Failed to create stdin msi\n");
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exit(1);
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}
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/* Now lets read from stdin and the network, line buffered (by nsock) */
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ts->latest_readtcpev = nsock_readlines(nsp, ts->tcp_nsi, telnet_event_handler, read_timeout, ts, 1);
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ts->latest_readstdinev = nsock_readlines(nsp, ts->stdin_nsi, telnet_event_handler, read_timeout, ts, 1);
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break;
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case NSE_TYPE_READ:
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str = nse_readbuf(nse, &nbytes);
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if (nsi == ts->tcp_nsi) {
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printf("%s", str);
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/* printf("Read from tcp socket (%d bytes):\n%s", nbytes, str); */
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ts->latest_readtcpev = nsock_readlines(nsp, ts->tcp_nsi, telnet_event_handler, read_timeout, ts, 1);
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} else {
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/* printf("Read from stdin (%d bytes):\n%s", nbytes, str); */
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nsock_write(nsp, ts->tcp_nsi, telnet_event_handler, write_timeout, ts, str, nbytes);
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ts->latest_readstdinev = nsock_readlines(nsp, ts->stdin_nsi, telnet_event_handler, read_timeout, ts, 1);
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}
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break;
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case NSE_TYPE_WRITE:
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/* Nothing to do, really */
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break;
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case NSE_TYPE_TIMER:
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break;
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default:
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fprintf(stderr, "telnet_event_handler: Got bogus type -- quitting\n");
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exit(1);
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break;
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}
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} else if (status == NSE_STATUS_EOF) {
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printf("Got EOF from %s\nCancelling outstanding readevents.\n", (nsi == ts->tcp_nsi) ? "tcp socket" : "stdin");
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/* One of these is the event I am currently handling! But I wanted to
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be evil when testing this out... */
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if (nsock_event_cancel(nsp, ts->latest_readtcpev, 1) != 0) {
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printf("Cancelled tcp event: %li\n", ts->latest_readtcpev);
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}
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if (nsock_event_cancel(nsp, ts->latest_readstdinev, 1) != 0) {
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printf("Cancelled stdin event: %li\n", ts->latest_readstdinev);
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}
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} else if (status == NSE_STATUS_ERROR) {
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if (nsi_checkssl(nsi)) {
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printf("SSL %s failed: %s\n", nse_type2str(type), ERR_error_string(ERR_get_error(), NULL));
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} else {
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int err;
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err = nse_errorcode(nse);
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printf("%s failed: (%d) %s\n", nse_type2str(type), err, strerror(err));
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}
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}
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return;
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}
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void usage() {
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fprintf(stderr, "\nUsage: nsock_telnet [-s] <hostnameorip> [portnum]\n" " Where -s enables SSL for the connection\n\n");
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exit(1);
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}
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int main(int argc, char *argv[]) {
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struct in_addr target;
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nsock_pool nsp;
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nsock_event_id ev;
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unsigned short portno;
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enum nsock_loopstatus loopret;
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struct telnet_state ts;
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int c;
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int usessl = 0;
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struct timeval now;
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struct sockaddr_in taddr;
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ts.stdin_nsi = NULL;
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while ((c = getopt(argc, argv, "s")) != -1) {
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switch (c) {
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case 's':
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usessl = 1;
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break;
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default:
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usage();
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break;
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}
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}
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if (argc - optind <= 0 || argc - optind > 2)
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usage();
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if (!resolve(argv[optind], &target)) {
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fprintf(stderr, "Failed to resolve target host: %s\nQUITTING.\n", argv[optind]);
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exit(1);
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}
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optind++;
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if (optind < argc)
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portno = atoi(argv[optind]);
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else
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portno = 23;
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/* OK, we start with creating a p00l */
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if ((nsp = nsp_new(NULL)) == NULL) {
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fprintf(stderr, "Failed to create new pool. QUITTING.\n");
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exit(1);
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}
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gettimeofday(&now, NULL);
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if ((ts.tcp_nsi = nsi_new(nsp, NULL)) == NULL) {
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fprintf(stderr, "Failed to create new nsock_iod. QUITTING.\n");
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exit(1);
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}
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taddr.sin_family = AF_INET;
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taddr.sin_addr = target;
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taddr.sin_port = portno;
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if (usessl) {
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ts.ssl_session = NULL;
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ev = nsock_connect_ssl(nsp, ts.tcp_nsi, telnet_event_handler, 10000, &ts, (struct sockaddr *)&taddr, sizeof taddr, IPPROTO_TCP, portno, ts.ssl_session);
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} else
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ev = nsock_connect_tcp(nsp, ts.tcp_nsi, telnet_event_handler, 10000, &ts, (struct sockaddr *)&taddr, sizeof taddr, portno);
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printf("The event id is %lu -- initiating l00p\n", ev);
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/* Now lets get this party started right! */
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loopret = nsock_loop(nsp, -1);
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printf("nsock_loop returned %d\n", (int)loopret);
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return 0;
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}
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