diff options
Diffstat (limited to 'plugins/check_smtp.c')
| -rw-r--r-- | plugins/check_smtp.c | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c new file mode 100644 index 00000000..d57b7841 --- /dev/null +++ b/plugins/check_smtp.c @@ -0,0 +1,362 @@ +/****************************************************************************** +* +* CHECK_SMTP.C +* +* Program: SMTP plugin for Nagios +* License: GPL +* Copyright (c) 1999 Ethan Galstad (nagios@nagios.org) +* +* $Id$ +* +* Description: +* +* This plugin will attempt to open an SMTP connection with the host. +* Successul connects return STATE_OK, refusals and timeouts return +* STATE_CRITICAL, other errors return STATE_UNKNOWN. Successful +* connects, but incorrect reponse messages from the host result in +* STATE_WARNING return values. +* +* 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 "netutils.h" +#include "utils.h" + +#define PROGNAME "check_smtp" + +#define SMTP_PORT 25 +#define SMTP_EXPECT "220" +#define SMTP_QUIT "QUIT\n" + +int process_arguments (int, char **); +int call_getopt (int, char **); +int validate_arguments (void); +int check_disk (int usp, int free_disk); +void print_help (void); +void print_usage (void); + +int server_port = SMTP_PORT; +char *server_address = NULL; +char *server_expect = NULL; +int warning_time = 0; +int check_warning_time = FALSE; +int critical_time = 0; +int check_critical_time = FALSE; +int verbose = FALSE; + +int +main (int argc, char **argv) +{ + int sd; + int result; + char buffer[MAX_INPUT_BUFFER] = ""; + + if (process_arguments (argc, argv) != OK) + usage ("Invalid command arguments supplied\n"); + + /* initialize alarm signal handling */ + signal (SIGALRM, socket_timeout_alarm_handler); + + /* set socket timeout */ + alarm (socket_timeout); + + /* try to connect to the host at the given port number */ + time (&start_time); + result = my_tcp_connect (server_address, server_port, &sd); + + /* we connected, so close connection before exiting */ + if (result == STATE_OK) { + + /* watch for the SMTP connection string */ + result = recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0); + + /* strip the buffer of carriage returns */ + strip (buffer); + + /* return a WARNING status if we couldn't read any data */ + if (result == -1) { + printf ("recv() failed\n"); + result = STATE_WARNING; + } + + else { + + /* make sure we find the response we are looking for */ + if (!strstr (buffer, server_expect)) { + if (server_port == SMTP_PORT) + printf ("Invalid SMTP response received from host\n"); + else + printf ("Invalid SMTP response received from host on port %d\n", + server_port); + result = STATE_WARNING; + } + + else { + + time (&end_time); + + result = STATE_OK; + + if (check_critical_time == TRUE + && (end_time - start_time) > critical_time) result = + STATE_CRITICAL; + else if (check_warning_time == TRUE + && (end_time - start_time) > warning_time) result = + STATE_WARNING; + + if (verbose == TRUE) + printf ("SMTP %s - %d sec. response time, %s\n", + state_text (result), (int) (end_time - start_time), buffer); + else + printf ("SMTP %s - %d second response time\n", state_text (result), + (int) (end_time - start_time)); + } + } + + /* close the connection */ + send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0); + close (sd); + } + + /* reset the alarm */ + alarm (0); + + return result; +} + + + + + + +/* process command-line arguments */ +int +process_arguments (int argc, char **argv) +{ + int c; + + if (argc < 2) + return ERROR; + + for (c = 1; c < argc; c++) { + if (strcmp ("-to", argv[c]) == 0) + strcpy (argv[c], "-t"); + else if (strcmp ("-wt", argv[c]) == 0) + strcpy (argv[c], "-w"); + else if (strcmp ("-ct", argv[c]) == 0) + strcpy (argv[c], "-c"); + } + + + + c = 0; + while ((c += (call_getopt (argc - c, &argv[c]))) < argc) { + + if (is_option (argv[c])) + continue; + + if (server_address == NULL) { + if (is_host (argv[c])) { + server_address = argv[c]; + } + else { + usage ("Invalid host name"); + } + } + } + + if (server_address == NULL) + server_address = strscpy (NULL, "127.0.0.1"); + + if (server_expect == NULL) + server_expect = strscpy (NULL, SMTP_EXPECT); + + return validate_arguments (); +} + + + + + + +int +call_getopt (int argc, char **argv) +{ + int c, i = 0; + +#ifdef HAVE_GETOPT_H + int option_index = 0; + static struct option long_options[] = { + {"hostname", required_argument, 0, 'H'}, + {"expect", required_argument, 0, 'e'}, + {"critical", required_argument, 0, 'c'}, + {"warning", required_argument, 0, 'w'}, + {"port", required_argument, 0, 'P'}, + {"verbose", no_argument, 0, 'v'}, + {"version", no_argument, 0, 'V'}, + {"help", no_argument, 0, 'h'}, + {0, 0, 0, 0} + }; +#endif + + while (1) { +#ifdef HAVE_GETOPT_H + c = + getopt_long (argc, argv, "+hVvt:p:e:c:w:H:", long_options, + &option_index); +#else + c = getopt (argc, argv, "+?hVvt:p:e:c:w:H:"); +#endif + + i++; + + if (c == -1 || c == EOF || c == 1) + break; + + switch (c) { + case 't': + case 'p': + case 'e': + case 'c': + case 'w': + case 'H': + i++; + } + + switch (c) { + case 'H': /* hostname */ + if (is_host (optarg)) { + server_address = optarg; + } + else { + usage ("Invalid host name\n"); + } + break; + case 'p': /* port */ + if (is_intpos (optarg)) { + server_port = atoi (optarg); + } + else { + usage ("Server port must be a positive integer\n"); + } + break; + case 'e': /* username */ + server_expect = optarg; + break; + case 'c': /* critical time threshold */ + if (is_intnonneg (optarg)) { + critical_time = atoi (optarg); + check_critical_time = TRUE; + } + else { + usage ("Critical time must be a nonnegative integer\n"); + } + break; + case 'w': /* warning time threshold */ + if (is_intnonneg (optarg)) { + warning_time = atoi (optarg); + check_warning_time = TRUE; + } + else { + usage ("Warning time must be a nonnegative integer\n"); + } + break; + case 'v': /* verbose */ + verbose = TRUE; + break; + case 't': /* timeout */ + if (is_intnonneg (optarg)) { + socket_timeout = atoi (optarg); + } + else { + usage ("Time interval must be a nonnegative integer\n"); + } + break; + case 'V': /* version */ + print_revision (PROGNAME, "$Revision$"); + exit (STATE_OK); + case 'h': /* help */ + print_help (); + exit (STATE_OK); + case '?': /* help */ + usage ("Invalid argument\n"); + } + } + return i; +} + + + + + +int +validate_arguments (void) +{ + return OK; +} + + + + + +void +print_help (void) +{ + print_revision (PROGNAME, "$Revision$"); + printf + ("Copyright (c) 2000 Ethan Galstad/Karl DeBisschop\n\n" + "This plugin test the SMTP service on the specified host.\n\n"); + print_usage (); + printf + ("\nOptions:\n" + " -H, --hostname=STRING or IPADDRESS\n" + " Check server on the indicated host\n" + " -p, --port=INTEGER\n" + " Make connection on the indicated port (default: %d)\n" + " -e, --expect=STRING\n" + " String to expect in first line of server response (default: %s)\n" + " -w, --warning=INTEGER\n" + " Seconds necessary to result in a warning status\n" + " -c, --critical=INTEGER\n" + " Seconds necessary to result in a critical status\n" + " -t, --timeout=INTEGER\n" + " Seconds before connection attempt times out (default: %d)\n" + " -v, --verbose\n" + " Print extra information (command-line use only)\n" + " -h, --help\n" + " Print detailed help screen\n" + " -V, --version\n" + " Print version information\n\n", + SMTP_PORT, SMTP_EXPECT, DEFAULT_SOCKET_TIMEOUT); + support (); +} + + + + + +void +print_usage (void) +{ + printf + ("Usage: %s -H host [-e expect] [-p port] [-w warn] [-c crit] [-t timeout] [-v]\n" + " %s --help\n" + " %s --version\n", PROGNAME, PROGNAME, PROGNAME); +} |