/****************************************************************************** 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. $Id$ ******************************************************************************/ const char *progname = "check_smtp"; const char *revision = "$Revision$"; const char *copyright = "2000-2003"; const char *email = "nagiosplug-devel@lists.sourceforge.net"; #include "common.h" #include "netutils.h" #include "utils.h" enum { SMTP_PORT = 25 }; const char *SMTP_EXPECT = "220"; const char *SMTP_HELO = "HELO "; const char *SMTP_QUIT = "QUIT\r\n"; int process_arguments (int, char **); int validate_arguments (void); void print_help (void); void print_usage (void); #ifdef HAVE_REGEX_H #include char regex_expect[MAX_INPUT_BUFFER] = ""; regex_t preg; regmatch_t pmatch[10]; char timestamp[10] = ""; char errbuf[MAX_INPUT_BUFFER]; int cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE; int eflags = 0; int errcode, excode; #endif int server_port = SMTP_PORT; char *server_address = NULL; char *server_expect = NULL; int smtp_use_dummycmd = 0; char *mail_command = NULL; char *from_arg = NULL; int ncommands=0; int command_size=0; int nresponses=0; int response_size=0; char **commands = NULL; char **responses = NULL; int warning_time = 0; int check_warning_time = FALSE; int critical_time = 0; int check_critical_time = FALSE; int verbose = 0; int main (int argc, char **argv) { int sd; int n = 0; double elapsed_time; long microsec; int result = STATE_UNKNOWN; char buffer[MAX_INPUT_BUFFER]; char *cmd_str = NULL; char *helocmd = NULL; struct timeval tv; setlocale (LC_ALL, ""); bindtextdomain (PACKAGE, LOCALEDIR); textdomain (PACKAGE); if (process_arguments (argc, argv) != OK) usage (_("check_smtp: could not parse arguments\n")); /* initialize the HELO command with the localhostname */ #ifndef HOST_MAX_BYTES #define HOST_MAX_BYTES 255 #endif helocmd = malloc (HOST_MAX_BYTES); gethostname(helocmd, HOST_MAX_BYTES); asprintf (&helocmd, "%s%s%s", SMTP_HELO, helocmd, "\r\n"); /* initialize the MAIL command with optional FROM command */ asprintf (&cmd_str, "%sFROM: %s%s", mail_command, from_arg, "\r\n"); if (verbose && smtp_use_dummycmd) printf ("FROM CMD: %s", cmd_str); /* initialize alarm signal handling */ (void) signal (SIGALRM, socket_timeout_alarm_handler); /* set socket timeout */ (void) alarm (socket_timeout); /* start timer */ gettimeofday (&tv, NULL); /* try to connect to the host at the given port number */ result = my_tcp_connect (server_address, server_port, &sd); if (result == STATE_OK) { /* we connected */ /* watch for the SMTP connection string and */ /* return a WARNING status if we couldn't read any data */ if (recv (sd, buffer, MAX_INPUT_BUFFER - 1, 0) == -1) { printf (_("recv() failed\n")); result = STATE_WARNING; } else { if (verbose) printf ("%s", buffer); /* strip the buffer of carriage returns */ strip (buffer); /* 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; } } /* send the HELO command */ send(sd, helocmd, strlen(helocmd), 0); /* allow for response to helo command to reach us */ recv(sd, buffer, MAX_INPUT_BUFFER-1, 0); /* sendmail will syslog a "NOQUEUE" error if session does not attempt * to do something useful. This can be prevented by giving a command * even if syntax is illegal (MAIL requires a FROM:<...> argument) * * According to rfc821 you can include a null reversepath in the from command * - but a log message is generated on the smtp server. * * You can disable sending mail_command with '--nocommand' * Use the -f option to provide a FROM address */ if (smtp_use_dummycmd) { send(sd, cmd_str, strlen(cmd_str), 0); recv(sd, buffer, MAX_INPUT_BUFFER-1, 0); if (verbose) printf("%s", buffer); } while (n < ncommands) { asprintf (&cmd_str, "%s%s", commands[n], "\r\n"); send(sd, cmd_str, strlen(cmd_str), 0); recv(sd, buffer, MAX_INPUT_BUFFER-1, 0); if (verbose) printf("%s", buffer); strip (buffer); if (n < nresponses) { #ifdef HAVE_REGEX_H cflags |= REG_EXTENDED | REG_NOSUB | REG_NEWLINE; //strncpy (regex_expect, responses[n], sizeof (regex_expect) - 1); //regex_expect[sizeof (regex_expect) - 1] = '\0'; errcode = regcomp (&preg, responses[n], cflags); if (errcode != 0) { regerror (errcode, &preg, errbuf, MAX_INPUT_BUFFER); printf (_("Could Not Compile Regular Expression")); return ERROR; } excode = regexec (&preg, buffer, 10, pmatch, eflags); if (excode == 0) { result = STATE_OK; } else if (excode == REG_NOMATCH) { result = STATE_WARNING; printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]); } else { regerror (excode, &preg, errbuf, MAX_INPUT_BUFFER); printf (_("Execute Error: %s\n"), errbuf); result = STATE_UNKNOWN; } #else if (strstr(buffer, responses[n])!=buffer) { result = STATE_WARNING; printf (_("SMTP %s - Invalid response '%s' to command '%s'\n"), state_text (result), buffer, commands[n]); } #endif } n++; } /* tell the server we're done */ send (sd, SMTP_QUIT, strlen (SMTP_QUIT), 0); /* finally close the connection */ close (sd); } /* reset the alarm */ alarm (0); microsec = deltime (tv); elapsed_time = (double)microsec / 1.0e6; if (result == STATE_OK) if (check_critical_time && elapsed_time > (double) critical_time) result = STATE_CRITICAL; else if (check_warning_time && elapsed_time > (double) warning_time) result = STATE_WARNING; printf (_("SMTP %s - %.3f sec. response time%s%s|%s\n"), state_text (result), elapsed_time, verbose?", ":"", verbose?buffer:"", fperfdata ("time", elapsed_time, "s", (int)check_warning_time, warning_time, (int)check_critical_time, critical_time, TRUE, 0, FALSE, 0)); return result; } /* process command-line arguments */ int process_arguments (int argc, char **argv) { int c; int option = 0; static struct option longopts[] = { {"hostname", required_argument, 0, 'H'}, {"expect", required_argument, 0, 'e'}, {"critical", required_argument, 0, 'c'}, {"warning", required_argument, 0, 'w'}, {"timeout", required_argument, 0, 't'}, {"port", required_argument, 0, 'p'}, {"from", required_argument, 0, 'f'}, {"command", required_argument, 0, 'C'}, {"response", required_argument, 0, 'R'}, {"nocommand", required_argument, 0, 'n'}, {"verbose", no_argument, 0, 'v'}, {"version", no_argument, 0, 'V'}, {"use-ipv4", no_argument, 0, '4'}, {"use-ipv6", no_argument, 0, '6'}, {"help", no_argument, 0, 'h'}, {0, 0, 0, 0} }; 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"); } while (1) { c = getopt_long (argc, argv, "+hVv46t:p:f:e:c:w:H:C:R:", longopts, &option); if (c == -1 || c == EOF) break; switch (c) { case 'H': /* hostname */ if (is_host (optarg)) { server_address = optarg; } else { usage2 (_("Invalid hostname/address"), optarg); } break; case 'p': /* port */ if (is_intpos (optarg)) server_port = atoi (optarg); else usage (_("Port must be a positive integer\n")); break; case 'f': /* from argument */ from_arg = optarg; smtp_use_dummycmd = 1; break; case 'e': /* server expect string on 220 */ server_expect = optarg; break; case 'C': /* commands */ if (ncommands >= command_size) { commands = realloc (commands, command_size+8); if (commands == NULL) die (STATE_UNKNOWN, _("Could not realloc() units [%d]\n"), ncommands); } commands[ncommands] = optarg; ncommands++; break; case 'R': /* server responses */ if (nresponses >= response_size) { responses = realloc (responses, response_size+8); if (responses == NULL) die (STATE_UNKNOWN, _("Could not realloc() units [%d]\n"), nresponses); } responses[nresponses] = optarg; nresponses++; 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 positive 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 positive integer\n")); } break; case 'v': /* verbose */ verbose++; break; case 't': /* timeout */ if (is_intnonneg (optarg)) { socket_timeout = atoi (optarg); } else { usage (_("Time interval must be a positive integer\n")); } break; case '4': address_family = AF_INET; break; case '6': #ifdef USE_IPV6 address_family = AF_INET6; #else usage (_("IPv6 support not available\n")); #endif break; case 'V': /* version */ print_revision (progname, revision); exit (STATE_OK); case 'h': /* help */ print_help (); exit (STATE_OK); case '?': /* help */ printf (_("%s: Unknown argument: %s\n\n"), progname, optarg); print_usage (); exit (STATE_UNKNOWN); } } c = optind; if (server_address == NULL) { if (argv[c]) { if (is_host (argv[c])) server_address = argv[c]; else usage2 (_("Invalid hostname/address"), argv[c]); } else { asprintf (&server_address, "127.0.0.1"); } } if (server_expect == NULL) server_expect = strdup (SMTP_EXPECT); if (mail_command == NULL) mail_command = strdup("MAIL "); if (from_arg==NULL) from_arg = strdup(" "); return validate_arguments (); } int validate_arguments (void) { return OK; } void print_help (void) { char *myport; asprintf (&myport, "%d", SMTP_PORT); print_revision (progname, revision); printf ("Copyright (c) 1999-2001 Ethan Galstad \n"); printf (COPYRIGHT, copyright, email); printf(_("\ This plugin will attempt to open an SMTP connection with the host.\n\n")); print_usage (); printf (_(UT_HELP_VRSN)); printf (_(UT_HOST_PORT), 'p', myport); printf (_(UT_IPv46)); printf (_("\ -e, --expect=STRING\n\ String to expect in first line of server response (default: '%s')\n\ -n, nocommand\n\ Suppress SMTP command\n\ -C, --command=STRING\n\ SMTP command (may be used repeatedly)\n\ -R, --command=STRING\n\ Expected response to command (may be used repeatedly)\n\ -f, --from=STRING\n\ FROM-address to include in MAIL command, required by Exchange 2000\n"), SMTP_EXPECT); printf (_(UT_WARN_CRIT)); printf (_(UT_TIMEOUT), DEFAULT_SOCKET_TIMEOUT); printf (_(UT_VERBOSE)); printf(_("\n\ Successul connects return STATE_OK, refusals and timeouts return\n\ STATE_CRITICAL, other errors return STATE_UNKNOWN. Successful\n\ connects, but incorrect reponse messages from the host result in\n\ STATE_WARNING return values.\n")); printf (_(UT_SUPPORT)); } void print_usage (void) { printf ("\ Usage: %s -H host [-p port] [-e expect] [-C command] [-f from addr]\n\ [-w warn] [-c crit] [-t timeout] [-n] [-v] [-4|-6]\n", progname); printf (_(UT_HLP_VRS), progname, progname); }