Initial revision

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@2 f882894a-f735-0410-b71e-b25c423dba1c

1 files changed, 431 insertions, 0 deletions

diff --git a/plugins/netutils.c b/plugins/netutils.c
new file mode 100644
index 00000000..e5d35281
--- /dev/null
+++ b/plugins/netutils.c
@@ -0,0 +1,431 @@
+/****************************************************************************
+*
+* Nagios plugins network utilities
+*
+* License: GPL
+* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org)
+*
+* Last Modified: $Date$
+*
+* Description:
+*
+* This file contains commons functions used in many of the plugins.
+*
+* License Information:
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation; either version 2 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+****************************************************************************/
+
+#include "config.h"
+#include "common.h"
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+extern int socket_timeout;
+RETSIGTYPE socket_timeout_alarm_handler (int);
+
+int process_tcp_request2 (char *, int, char *, char *, int);
+int process_tcp_request (char *, int, char *, char *, int);
+int process_udp_request (char *, int, char *, char *, int);
+int process_request (char *, int, char *, char *, char *, int);
+
+int my_tcp_connect (char *, int, int *);
+int my_udp_connect (char *, int, int *);
+int my_connect (char *, int, int *, char *);
+
+int my_inet_aton (register const char *, struct in_addr *);
+
+/* handles socket timeouts */
+void
+socket_timeout_alarm_handler (int sig)
+{
+
+	printf ("Socket timeout after %d seconds\n", socket_timeout);
+
+	exit (STATE_CRITICAL);
+}
+
+
+/* connects to a host on a specified TCP port, sends a string,
+   and gets a response */
+int
+process_tcp_request (char *server_address,
+										 int server_port,
+										 char *send_buffer, char *recv_buffer, int recv_size)
+{
+	int result;
+	char proto[4] = "tcp";
+
+	result = process_request (server_address,
+														server_port,
+														proto, send_buffer, recv_buffer, recv_size);
+
+	return result;
+}
+
+
+/* connects to a host on a specified UDP port, sends a string, and gets a
+    response */
+int
+process_udp_request (char *server_address,
+										 int server_port,
+										 char *send_buffer, char *recv_buffer, int recv_size)
+{
+	int result;
+	char proto[4] = "udp";
+
+	result = process_request (server_address,
+														server_port,
+														proto, send_buffer, recv_buffer, recv_size);
+
+	return result;
+}
+
+
+
+/* connects to a host on a specified tcp port, sends a string, and gets a 
+	 response. loops on select-recv until timeout or eof to get all of a 
+	 multi-packet answer */
+int
+process_tcp_request2 (char *server_address,
+											int server_port,
+											char *send_buffer, char *recv_buffer, int recv_size)
+{
+
+	int result;
+	int send_result;
+	int recv_result;
+	int sd;
+	struct timeval tv;
+	fd_set readfds;
+	int recv_length = 0;
+
+	result = my_connect (server_address, server_port, &sd, "tcp");
+	if (result != STATE_OK)
+		return STATE_CRITICAL;
+
+	send_result = send (sd, send_buffer, strlen (send_buffer), 0);
+	if (send_result != strlen (send_buffer)) {
+		printf ("send() failed\n");
+		result = STATE_WARNING;
+	}
+
+	while (1) {
+		/* wait up to the number of seconds for socket timeout
+		   minus one for data from the host */
+		tv.tv_sec = socket_timeout - 1;
+		tv.tv_usec = 0;
+		FD_ZERO (&readfds);
+		FD_SET (sd, &readfds);
+		select (sd + 1, &readfds, NULL, NULL, &tv);
+
+		/* make sure some data has arrived */
+		if (!FD_ISSET (sd, &readfds)) {	/* it hasn't */
+			if (!recv_length) {
+				strcpy (recv_buffer, "");
+				printf ("No data was recieved from host!\n");
+				result = STATE_WARNING;
+			}
+			else {										/* this one failed, but previous ones worked */
+				recv_buffer[recv_length] = 0;
+			}
+			break;
+		}
+		else {											/* it has */
+			recv_result =
+				recv (sd, recv_buffer + recv_length, recv_size - recv_length - 1, 0);
+			if (recv_result == -1) {	/* recv failed, bail out */
+				strcpy (recv_buffer + recv_length, "");
+				result = STATE_WARNING;
+				break;
+			}
+			else if (recv_result == 0) {	/* end of file ? */
+				recv_buffer[recv_length] = 0;
+				break;
+			}
+			else {										/* we got data! */
+				recv_length += recv_result;
+				if (recv_length >= recv_size - 1) {	/* buffer full, we're done */
+					recv_buffer[recv_size - 1] = 0;
+					break;
+				}
+			}
+		}														/* end if(!FD_ISSET(sd,&readfds)) */
+	}															/* end while(1) */
+
+	close (sd);
+	return result;
+}
+
+/* connects to a host on a specified port, sends a string, and gets a 
+   response */
+int
+process_request (char *server_address,
+								 int server_port,
+								 char *proto,
+								 char *send_buffer, char *recv_buffer, int recv_size)
+{
+	int result;
+	int send_result;
+	int recv_result;
+	int sd;
+	struct timeval tv;
+	fd_set readfds;
+
+	result = STATE_OK;
+
+	result = my_connect (server_address, server_port, &sd, proto);
+	if (result != STATE_OK)
+		return STATE_CRITICAL;
+
+	send_result = send (sd, send_buffer, strlen (send_buffer), 0);
+	if (send_result != strlen (send_buffer)) {
+		printf ("send() failed\n");
+		result = STATE_WARNING;
+	}
+
+	/* wait up to the number of seconds for socket timeout minus one 
+	   for data from the host */
+	tv.tv_sec = socket_timeout - 1;
+	tv.tv_usec = 0;
+	FD_ZERO (&readfds);
+	FD_SET (sd, &readfds);
+	select (sd + 1, &readfds, NULL, NULL, &tv);
+
+	/* make sure some data has arrived */
+	if (!FD_ISSET (sd, &readfds)) {
+		strcpy (recv_buffer, "");
+		printf ("No data was recieved from host!\n");
+		result = STATE_WARNING;
+	}
+
+	else {
+		recv_result = recv (sd, recv_buffer, recv_size - 1, 0);
+		if (recv_result == -1) {
+			strcpy (recv_buffer, "");
+			if (!strcmp (proto, "tcp"))
+				printf ("recv() failed\n");
+			result = STATE_WARNING;
+		}
+		else
+			recv_buffer[recv_result] = 0;
+
+		/* terminate returned string */
+		recv_buffer[recv_size - 1] = 0;
+	}
+
+	close (sd);
+
+	return result;
+}
+
+
+/* opens a connection to a remote host/tcp port */
+int
+my_tcp_connect (char *host_name, int port, int *sd)
+{
+	int result;
+	char proto[4] = "tcp";
+
+	result = my_connect (host_name, port, sd, proto);
+
+	return result;
+}
+
+
+/* opens a connection to a remote host/udp port */
+int
+my_udp_connect (char *host_name, int port, int *sd)
+{
+	int result;
+	char proto[4] = "udp";
+
+	result = my_connect (host_name, port, sd, proto);
+
+	return result;
+}
+
+
+/* opens a tcp or udp connection to a remote host */
+int
+my_connect (char *host_name, int port, int *sd, char *proto)
+{
+	struct sockaddr_in servaddr;
+	struct hostent *hp;
+	struct protoent *ptrp;
+	int result;
+
+	bzero ((char *) &servaddr, sizeof (servaddr));
+	servaddr.sin_family = AF_INET;
+	servaddr.sin_port = htons (port);
+
+	/* try to bypass using a DNS lookup if this is just an IP address */
+	if (!my_inet_aton (host_name, &servaddr.sin_addr)) {
+
+		/* else do a DNS lookup */
+		hp = gethostbyname ((const char *) host_name);
+		if (hp == NULL) {
+			printf ("Invalid host name '%s'\n", host_name);
+			return STATE_UNKNOWN;
+		}
+
+		memcpy (&servaddr.sin_addr, hp->h_addr, hp->h_length);
+	}
+
+	/* map transport protocol name to protocol number */
+	if ((ptrp = getprotobyname (proto)) == NULL) {
+		printf ("Cannot map \"%s\" to protocol number\n", proto);
+		return STATE_UNKNOWN;
+	}
+
+	/* create a socket */
+	*sd =
+		socket (PF_INET, (!strcmp (proto, "udp")) ? SOCK_DGRAM : SOCK_STREAM,
+						ptrp->p_proto);
+	if (*sd < 0) {
+		printf ("Socket creation failed\n");
+		return STATE_UNKNOWN;
+	}
+
+	/* open a connection */
+	result = connect (*sd, (struct sockaddr *) &servaddr, sizeof (servaddr));
+	if (result < 0) {
+		switch (errno) {
+		case ECONNREFUSED:
+			printf ("Connection refused by host\n");
+			break;
+		case ETIMEDOUT:
+			printf ("Timeout while attempting connection\n");
+			break;
+		case ENETUNREACH:
+			printf ("Network is unreachable\n");
+			break;
+		default:
+			printf ("Connection refused or timed out\n");
+		}
+
+		return STATE_CRITICAL;
+	}
+
+	return STATE_OK;
+}
+
+
+
+/* This code was taken from Fyodor's nmap utility, which was originally
+	 taken from the GLIBC 2.0.6 libraries because Solaris doesn't contain
+	 the inet_aton() funtion. */
+int
+my_inet_aton (register const char *cp, struct in_addr *addr)
+{
+	register unsigned int val;		/* changed from u_long --david */
+	register int base, n;
+	register char c;
+	u_int parts[4];
+	register u_int *pp = parts;
+
+	c = *cp;
+
+	for (;;) {
+
+		/*
+		 * Collect number up to ``.''.
+		 * Values are specified as for C:
+		 * 0x=hex, 0=octal, isdigit=decimal.
+		 */
+		if (!isdigit ((int) c))
+			return (0);
+		val = 0;
+		base = 10;
+
+		if (c == '0') {
+			c = *++cp;
+			if (c == 'x' || c == 'X')
+				base = 16, c = *++cp;
+			else
+				base = 8;
+		}
+
+		for (;;) {
+			if (isascii ((int) c) && isdigit ((int) c)) {
+				val = (val * base) + (c - '0');
+				c = *++cp;
+			}
+			else if (base == 16 && isascii ((int) c) && isxdigit ((int) c)) {
+				val = (val << 4) | (c + 10 - (islower ((int) c) ? 'a' : 'A'));
+				c = *++cp;
+			}
+			else
+				break;
+		}
+
+		if (c == '.') {
+
+			/*
+			 * Internet format:
+			 *  a.b.c.d
+			 *  a.b.c (with c treated as 16 bits)
+			 *  a.b (with b treated as 24 bits)
+			 */
+			if (pp >= parts + 3)
+				return (0);
+			*pp++ = val;
+			c = *++cp;
+		}
+		else
+			break;
+	}
+
+	/* Check for trailing characters */
+	if (c != '\0' && (!isascii ((int) c) || !isspace ((int) c)))
+		return (0);
+
+	/* Concoct the address according to the number of parts specified */
+	n = pp - parts + 1;
+	switch (n) {
+
+	case 0:
+		return (0);									/* initial nondigit */
+
+	case 1:											/* a -- 32 bits */
+		break;
+
+	case 2:											/* a.b -- 8.24 bits */
+		if (val > 0xffffff)
+			return (0);
+		val |= parts[0] << 24;
+		break;
+
+	case 3:											/* a.b.c -- 8.8.16 bits */
+		if (val > 0xffff)
+			return (0);
+		val |= (parts[0] << 24) | (parts[1] << 16);
+		break;
+
+	case 4:											/* a.b.c.d -- 8.8.8.8 bits */
+		if (val > 0xff)
+			return (0);
+		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+		break;
+	}
+
+	if (addr)
+		addr->s_addr = htonl (val);
+
+	return (1);
+}