mirror of
https://github.com/monitoring-plugins/monitoring-plugins.git
synced 2026-02-03 18:49:29 -05:00
44a321cb8a
git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2 f882894a-f735-0410-b71e-b25c423dba1c
431 lines
10 KiB
C
431 lines
10 KiB
C
/****************************************************************************
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*
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* Nagios plugins network utilities
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*
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* License: GPL
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* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
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*
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* Last Modified: $Date$
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*
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* Description:
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*
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* This file contains commons functions used in many of the plugins.
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*
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* License Information:
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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****************************************************************************/
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#include "config.h"
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#include "common.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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extern int socket_timeout;
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RETSIGTYPE socket_timeout_alarm_handler (int);
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int process_tcp_request2 (char *, int, char *, char *, int);
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int process_tcp_request (char *, int, char *, char *, int);
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int process_udp_request (char *, int, char *, char *, int);
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int process_request (char *, int, char *, char *, char *, int);
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int my_tcp_connect (char *, int, int *);
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int my_udp_connect (char *, int, int *);
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int my_connect (char *, int, int *, char *);
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int my_inet_aton (register const char *, struct in_addr *);
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/* handles socket timeouts */
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void
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socket_timeout_alarm_handler (int sig)
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{
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printf ("Socket timeout after %d seconds\n", socket_timeout);
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exit (STATE_CRITICAL);
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}
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/* connects to a host on a specified TCP port, sends a string,
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and gets a response */
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int
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process_tcp_request (char *server_address,
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int server_port,
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char *send_buffer, char *recv_buffer, int recv_size)
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{
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int result;
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char proto[4] = "tcp";
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result = process_request (server_address,
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server_port,
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proto, send_buffer, recv_buffer, recv_size);
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return result;
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}
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/* connects to a host on a specified UDP port, sends a string, and gets a
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response */
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int
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process_udp_request (char *server_address,
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int server_port,
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char *send_buffer, char *recv_buffer, int recv_size)
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{
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int result;
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char proto[4] = "udp";
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result = process_request (server_address,
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server_port,
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proto, send_buffer, recv_buffer, recv_size);
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return result;
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}
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/* connects to a host on a specified tcp port, sends a string, and gets a
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response. loops on select-recv until timeout or eof to get all of a
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multi-packet answer */
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int
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process_tcp_request2 (char *server_address,
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int server_port,
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char *send_buffer, char *recv_buffer, int recv_size)
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{
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int result;
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int send_result;
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int recv_result;
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int sd;
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struct timeval tv;
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fd_set readfds;
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int recv_length = 0;
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result = my_connect (server_address, server_port, &sd, "tcp");
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if (result != STATE_OK)
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return STATE_CRITICAL;
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send_result = send (sd, send_buffer, strlen (send_buffer), 0);
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if (send_result != strlen (send_buffer)) {
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printf ("send() failed\n");
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result = STATE_WARNING;
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}
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while (1) {
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/* wait up to the number of seconds for socket timeout
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minus one for data from the host */
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tv.tv_sec = socket_timeout - 1;
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tv.tv_usec = 0;
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FD_ZERO (&readfds);
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FD_SET (sd, &readfds);
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select (sd + 1, &readfds, NULL, NULL, &tv);
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/* make sure some data has arrived */
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if (!FD_ISSET (sd, &readfds)) { /* it hasn't */
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if (!recv_length) {
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strcpy (recv_buffer, "");
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printf ("No data was recieved from host!\n");
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result = STATE_WARNING;
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}
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else { /* this one failed, but previous ones worked */
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recv_buffer[recv_length] = 0;
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}
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break;
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}
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else { /* it has */
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recv_result =
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recv (sd, recv_buffer + recv_length, recv_size - recv_length - 1, 0);
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if (recv_result == -1) { /* recv failed, bail out */
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strcpy (recv_buffer + recv_length, "");
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result = STATE_WARNING;
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break;
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}
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else if (recv_result == 0) { /* end of file ? */
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recv_buffer[recv_length] = 0;
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break;
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}
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else { /* we got data! */
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recv_length += recv_result;
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if (recv_length >= recv_size - 1) { /* buffer full, we're done */
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recv_buffer[recv_size - 1] = 0;
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break;
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}
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}
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} /* end if(!FD_ISSET(sd,&readfds)) */
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} /* end while(1) */
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close (sd);
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return result;
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}
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/* connects to a host on a specified port, sends a string, and gets a
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response */
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int
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process_request (char *server_address,
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int server_port,
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char *proto,
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char *send_buffer, char *recv_buffer, int recv_size)
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{
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int result;
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int send_result;
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int recv_result;
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int sd;
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struct timeval tv;
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fd_set readfds;
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result = STATE_OK;
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result = my_connect (server_address, server_port, &sd, proto);
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if (result != STATE_OK)
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return STATE_CRITICAL;
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send_result = send (sd, send_buffer, strlen (send_buffer), 0);
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if (send_result != strlen (send_buffer)) {
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printf ("send() failed\n");
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result = STATE_WARNING;
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}
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/* wait up to the number of seconds for socket timeout minus one
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for data from the host */
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tv.tv_sec = socket_timeout - 1;
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tv.tv_usec = 0;
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FD_ZERO (&readfds);
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FD_SET (sd, &readfds);
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select (sd + 1, &readfds, NULL, NULL, &tv);
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/* make sure some data has arrived */
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if (!FD_ISSET (sd, &readfds)) {
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strcpy (recv_buffer, "");
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printf ("No data was recieved from host!\n");
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result = STATE_WARNING;
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}
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else {
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recv_result = recv (sd, recv_buffer, recv_size - 1, 0);
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if (recv_result == -1) {
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strcpy (recv_buffer, "");
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if (!strcmp (proto, "tcp"))
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printf ("recv() failed\n");
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result = STATE_WARNING;
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}
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else
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recv_buffer[recv_result] = 0;
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/* terminate returned string */
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recv_buffer[recv_size - 1] = 0;
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}
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close (sd);
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return result;
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}
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/* opens a connection to a remote host/tcp port */
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int
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my_tcp_connect (char *host_name, int port, int *sd)
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{
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int result;
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char proto[4] = "tcp";
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result = my_connect (host_name, port, sd, proto);
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return result;
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}
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/* opens a connection to a remote host/udp port */
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int
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my_udp_connect (char *host_name, int port, int *sd)
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{
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int result;
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char proto[4] = "udp";
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result = my_connect (host_name, port, sd, proto);
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return result;
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}
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/* opens a tcp or udp connection to a remote host */
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int
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my_connect (char *host_name, int port, int *sd, char *proto)
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{
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struct sockaddr_in servaddr;
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struct hostent *hp;
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struct protoent *ptrp;
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int result;
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bzero ((char *) &servaddr, sizeof (servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_port = htons (port);
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/* try to bypass using a DNS lookup if this is just an IP address */
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if (!my_inet_aton (host_name, &servaddr.sin_addr)) {
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/* else do a DNS lookup */
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hp = gethostbyname ((const char *) host_name);
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if (hp == NULL) {
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printf ("Invalid host name '%s'\n", host_name);
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return STATE_UNKNOWN;
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}
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memcpy (&servaddr.sin_addr, hp->h_addr, hp->h_length);
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}
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/* map transport protocol name to protocol number */
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if ((ptrp = getprotobyname (proto)) == NULL) {
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printf ("Cannot map \"%s\" to protocol number\n", proto);
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return STATE_UNKNOWN;
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}
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/* create a socket */
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*sd =
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socket (PF_INET, (!strcmp (proto, "udp")) ? SOCK_DGRAM : SOCK_STREAM,
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ptrp->p_proto);
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if (*sd < 0) {
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printf ("Socket creation failed\n");
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return STATE_UNKNOWN;
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}
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/* open a connection */
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result = connect (*sd, (struct sockaddr *) &servaddr, sizeof (servaddr));
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if (result < 0) {
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switch (errno) {
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case ECONNREFUSED:
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printf ("Connection refused by host\n");
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break;
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case ETIMEDOUT:
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printf ("Timeout while attempting connection\n");
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break;
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case ENETUNREACH:
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printf ("Network is unreachable\n");
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break;
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default:
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printf ("Connection refused or timed out\n");
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}
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return STATE_CRITICAL;
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}
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return STATE_OK;
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}
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/* This code was taken from Fyodor's nmap utility, which was originally
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taken from the GLIBC 2.0.6 libraries because Solaris doesn't contain
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the inet_aton() funtion. */
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int
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my_inet_aton (register const char *cp, struct in_addr *addr)
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{
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register unsigned int val; /* changed from u_long --david */
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register int base, n;
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register char c;
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u_int parts[4];
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register u_int *pp = parts;
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c = *cp;
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for (;;) {
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/*
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* Collect number up to ``.''.
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* Values are specified as for C:
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* 0x=hex, 0=octal, isdigit=decimal.
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*/
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if (!isdigit ((int) c))
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return (0);
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val = 0;
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base = 10;
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if (c == '0') {
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c = *++cp;
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if (c == 'x' || c == 'X')
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base = 16, c = *++cp;
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else
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base = 8;
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}
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for (;;) {
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if (isascii ((int) c) && isdigit ((int) c)) {
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val = (val * base) + (c - '0');
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c = *++cp;
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}
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else if (base == 16 && isascii ((int) c) && isxdigit ((int) c)) {
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val = (val << 4) | (c + 10 - (islower ((int) c) ? 'a' : 'A'));
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c = *++cp;
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}
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else
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break;
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}
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if (c == '.') {
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/*
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* Internet format:
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* a.b.c.d
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* a.b.c (with c treated as 16 bits)
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* a.b (with b treated as 24 bits)
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*/
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if (pp >= parts + 3)
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return (0);
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*pp++ = val;
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c = *++cp;
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}
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else
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break;
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}
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/* Check for trailing characters */
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if (c != '\0' && (!isascii ((int) c) || !isspace ((int) c)))
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return (0);
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/* Concoct the address according to the number of parts specified */
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n = pp - parts + 1;
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switch (n) {
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case 0:
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return (0); /* initial nondigit */
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case 1: /* a -- 32 bits */
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break;
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case 2: /* a.b -- 8.24 bits */
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if (val > 0xffffff)
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return (0);
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val |= parts[0] << 24;
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break;
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case 3: /* a.b.c -- 8.8.16 bits */
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if (val > 0xffff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16);
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break;
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case 4: /* a.b.c.d -- 8.8.8.8 bits */
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if (val > 0xff)
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return (0);
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val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
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break;
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}
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if (addr)
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addr->s_addr = htonl (val);
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return (1);
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}
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