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);
+}