mirror of
https://github.com/monitoring-plugins/monitoring-plugins.git
synced 2026-02-03 18:49:29 -05:00
63734f52ab
This is an initial take at renaming the project to Monitoring Plugins. It's not expected to be fully complete, and it is expected to break things (The perl module for instance). More testing will be required before this goes mainline.
367 lines
8.9 KiB
C
367 lines
8.9 KiB
C
/*****************************************************************************
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*
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* Monitoring 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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* Copyright (c) 2003-2008 Monitoring Plugins Development Team
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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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*
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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 3 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, see <http://www.gnu.org/licenses/>.
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*
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*
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*****************************************************************************/
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#include "common.h"
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#include "netutils.h"
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unsigned int socket_timeout = DEFAULT_SOCKET_TIMEOUT;
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unsigned int socket_timeout_state = STATE_CRITICAL;
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int econn_refuse_state = STATE_CRITICAL;
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int was_refused = FALSE;
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#if USE_IPV6
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int address_family = AF_UNSPEC;
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#else
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int address_family = AF_INET;
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#endif
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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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if (sig == SIGALRM)
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printf (_("%s - Socket timeout after %d seconds\n"), state_text(socket_timeout_state), socket_timeout);
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else
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printf (_("%s - Abnormal timeout after %d seconds\n"), state_text(socket_timeout_state), socket_timeout);
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exit (socket_timeout_state);
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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 (const char *server_address, int server_port,
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const 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 = np_net_connect (server_address, server_port, &sd, IPPROTO_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<0 || (size_t)send_result!=strlen(send_buffer)) {
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printf ("%s\n", _("Send failed"));
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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 ("%s\n", _("No data was received from host!"));
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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,
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(size_t)recv_size - recv_length - 1, 0);
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if (recv_result == -1) {
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/* 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) {
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/* 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) {
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/* 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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}
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/* end if(!FD_ISSET(sd,&readfds)) */
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}
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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 (const char *server_address, int server_port, int proto,
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const char *send_buffer, char *recv_buffer, int recv_size)
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{
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int result;
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int sd;
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result = STATE_OK;
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result = np_net_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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result = send_request (sd, proto, send_buffer, recv_buffer, recv_size);
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close (sd);
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return result;
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}
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/* opens a tcp or udp connection to a remote host or local socket */
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int
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np_net_connect (const char *host_name, int port, int *sd, int proto)
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{
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struct addrinfo hints;
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struct addrinfo *r, *res;
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struct sockaddr_un su;
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char port_str[6], host[MAX_HOST_ADDRESS_LENGTH];
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size_t len;
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int socktype, result;
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socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
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/* as long as it doesn't start with a '/', it's assumed a host or ip */
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if(host_name[0] != '/'){
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memset (&hints, 0, sizeof (hints));
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hints.ai_family = address_family;
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hints.ai_protocol = proto;
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hints.ai_socktype = socktype;
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len = strlen (host_name);
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/* check for an [IPv6] address (and strip the brackets) */
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if (len >= 2 && host_name[0] == '[' && host_name[len - 1] == ']') {
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host_name++;
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len -= 2;
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}
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if (len >= sizeof(host))
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return STATE_UNKNOWN;
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memcpy (host, host_name, len);
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host[len] = '\0';
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snprintf (port_str, sizeof (port_str), "%d", port);
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result = getaddrinfo (host, port_str, &hints, &res);
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if (result != 0) {
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printf ("%s\n", gai_strerror (result));
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return STATE_UNKNOWN;
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}
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r = res;
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while (r) {
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/* attempt to create a socket */
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*sd = socket (r->ai_family, socktype, r->ai_protocol);
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if (*sd < 0) {
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printf ("%s\n", _("Socket creation failed"));
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freeaddrinfo (r);
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return STATE_UNKNOWN;
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}
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/* attempt to open a connection */
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result = connect (*sd, r->ai_addr, r->ai_addrlen);
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if (result == 0) {
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was_refused = FALSE;
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break;
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}
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if (result < 0) {
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switch (errno) {
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case ECONNREFUSED:
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was_refused = TRUE;
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break;
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}
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}
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close (*sd);
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r = r->ai_next;
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}
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freeaddrinfo (res);
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}
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/* else the hostname is interpreted as a path to a unix socket */
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else {
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if(strlen(host_name) >= UNIX_PATH_MAX){
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die(STATE_UNKNOWN, _("Supplied path too long unix domain socket"));
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}
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memset(&su, 0, sizeof(su));
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su.sun_family = AF_UNIX;
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strncpy(su.sun_path, host_name, UNIX_PATH_MAX);
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*sd = socket(PF_UNIX, SOCK_STREAM, 0);
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if(*sd < 0){
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die(STATE_UNKNOWN, _("Socket creation failed"));
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}
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result = connect(*sd, (struct sockaddr *)&su, sizeof(su));
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if (result < 0 && errno == ECONNREFUSED)
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was_refused = TRUE;
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}
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if (result == 0)
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return STATE_OK;
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else if (was_refused) {
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switch (econn_refuse_state) { /* a user-defined expected outcome */
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case STATE_OK:
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case STATE_WARNING: /* user wants WARN or OK on refusal */
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return econn_refuse_state;
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break;
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case STATE_CRITICAL: /* user did not set econn_refuse_state */
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printf ("%s\n", strerror(errno));
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return econn_refuse_state;
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break;
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default: /* it's a logic error if we do not end up in STATE_(OK|WARNING|CRITICAL) */
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return STATE_UNKNOWN;
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break;
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}
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}
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else {
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printf ("%s\n", strerror(errno));
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return STATE_CRITICAL;
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}
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}
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int
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send_request (int sd, int proto, const char *send_buffer, char *recv_buffer, int recv_size)
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{
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int result = STATE_OK;
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int send_result;
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int recv_result;
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struct timeval tv;
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fd_set readfds;
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send_result = send (sd, send_buffer, strlen (send_buffer), 0);
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if (send_result<0 || (size_t)send_result!=strlen(send_buffer)) {
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printf ("%s\n", _("Send failed"));
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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 ("%s\n", _("No data was received from host!"));
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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, (size_t)recv_size - 1, 0);
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if (recv_result == -1) {
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strcpy (recv_buffer, "");
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if (proto != IPPROTO_TCP)
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printf ("%s\n", _("Receive failed"));
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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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/* die returned string */
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recv_buffer[recv_size - 1] = 0;
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}
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return result;
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}
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int
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is_host (const char *address)
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{
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if (is_addr (address) || is_hostname (address))
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return (TRUE);
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return (FALSE);
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}
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void
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host_or_die(const char *str)
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{
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if(!str || (!is_addr(str) && !is_hostname(str)))
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usage_va(_("Invalid hostname/address - %s"), str);
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}
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int
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is_addr (const char *address)
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{
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#ifdef USE_IPV6
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if (address_family == AF_INET && is_inet_addr (address))
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return TRUE;
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else if (address_family == AF_INET6 && is_inet6_addr (address))
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return TRUE;
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#else
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if (is_inet_addr (address))
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return (TRUE);
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#endif
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return (FALSE);
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}
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int
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resolve_host_or_addr (const char *address, int family)
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{
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struct addrinfo hints;
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struct addrinfo *res;
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int retval;
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memset (&hints, 0, sizeof (hints));
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hints.ai_family = family;
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retval = getaddrinfo (address, NULL, &hints, &res);
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if (retval != 0)
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return FALSE;
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else {
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freeaddrinfo (res);
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return TRUE;
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}
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}
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