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nagios4/cgi/showlog.c

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/***********************************************************************
*
* SHOWLOG.C - Nagios Log File CGI
*
* Copyright (c) 1999-2008 Ethan Galstad (egalstad@nagios.org)
* Last Modified: 01-08-2008
*
* This CGI program will display the contents of the Nagios
* log file.
*
* License:
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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 "../include/config.h"
#include "../include/common.h"
#include "../include/objects.h"
#include "../include/getcgi.h"
#include "../include/cgiutils.h"
#include "../include/cgiauth.h"
extern char main_config_file[MAX_FILENAME_LENGTH];
extern char url_html_path[MAX_FILENAME_LENGTH];
extern char url_images_path[MAX_FILENAME_LENGTH];
extern char url_stylesheets_path[MAX_FILENAME_LENGTH];
extern int log_rotation_method;
extern int enable_splunk_integration;
void document_header(int);
void document_footer(void);
int process_cgivars(void);
authdata current_authdata;
int display_log(void);
char log_file_to_use[MAX_FILENAME_LENGTH] = "";
int log_archive = 0;
int use_lifo = TRUE;
int embedded = FALSE;
int display_header = TRUE;
int display_frills = TRUE;
int display_timebreaks = TRUE;
int main(void) {
int result = OK;
char temp_buffer[MAX_INPUT_BUFFER];
/* get the CGI variables passed in the URL */
process_cgivars();
/* reset internal variables */
reset_cgi_vars();
/* read the CGI configuration file */
result = read_cgi_config_file(get_cgi_config_location());
if(result == ERROR) {
document_header(FALSE);
cgi_config_file_error(get_cgi_config_location());
document_footer();
return ERROR;
}
/* read the main configuration file */
result = read_main_config_file(main_config_file);
if(result == ERROR) {
document_header(FALSE);
main_config_file_error(main_config_file);
document_footer();
return ERROR;
}
/* read all object configuration data */
result = read_all_object_configuration_data(main_config_file, READ_ALL_OBJECT_DATA);
if(result == ERROR) {
document_header(FALSE);
object_data_error();
document_footer();
return ERROR;
}
document_header(TRUE);
/* get authentication information */
get_authentication_information(&current_authdata);
/* determine what log file we should be using */
get_log_archive_to_use(log_archive, log_file_to_use, (int)sizeof(log_file_to_use));
if(display_header == TRUE) {
/* begin top table */
printf("<table border=0 width=100%% cellpadding=0 cellspacing=0>\n");
printf("<tr>\n");
/* left column of top table - info box */
printf("<td align=left valign=top width=33%%>\n");
display_info_table((log_rotation_method == LOG_ROTATION_NONE || log_archive == 0) ? "Current Event Log" : "Archived Event Log", FALSE, &current_authdata);
printf("</td>\n");
/* middle column of top table - log file navigation options */
printf("<td align=center valign=top width=33%%>\n");
snprintf(temp_buffer, sizeof(temp_buffer) - 1, "%s?%s", SHOWLOG_CGI, (use_lifo == FALSE) ? "oldestfirst&" : "");
temp_buffer[sizeof(temp_buffer) - 1] = '\x0';
display_nav_table(temp_buffer, log_archive);
printf("</td>\n");
/* right hand column of top row */
printf("<td align=right valign=top width=33%%>\n");
printf("<form method='GET' action='%s'>\n", SHOWLOG_CGI);
printf("<input type='hidden' name='archive' value='%d'>\n", log_archive);
printf("<table border=0 cellspacing=0 cellpadding=0 CLASS='optBox'>\n");
printf("<tr>");
printf("<td align=left valign=bottom CLASS='optBoxItem'><input type='checkbox' name='oldestfirst' %s> Older Entries First:</td>", (use_lifo == FALSE) ? "checked" : "");
printf("</tr>\n");
printf("<tr>");
printf("<td align=left valign=bottom CLASS='optBoxItem'><input type='submit' value='Update'></td>\n");
printf("</tr>\n");
/* display context-sensitive help */
printf("<tr>\n");
printf("<td align=right>\n");
display_context_help(CONTEXTHELP_LOG);
printf("</td>\n");
printf("</tr>\n");
printf("</table>\n");
printf("</form>\n");
printf("</td>\n");
/* end of top table */
printf("</tr>\n");
printf("</table>\n");
printf("</p>\n");
}
/* display the contents of the log file */
display_log();
document_footer();
/* free allocated memory */
free_memory();
return OK;
}
void document_header(int use_stylesheet) {
char date_time[MAX_DATETIME_LENGTH];
time_t current_time;
time_t expire_time;
printf("Cache-Control: no-store\r\n");
printf("Pragma: no-cache\r\n");
time(&current_time);
get_time_string(&current_time, date_time, (int)sizeof(date_time), HTTP_DATE_TIME);
printf("Last-Modified: %s\r\n", date_time);
expire_time = (time_t)0L;
get_time_string(&expire_time, date_time, (int)sizeof(date_time), HTTP_DATE_TIME);
printf("Expires: %s\r\n", date_time);
printf("Content-type: text/html\r\n\r\n");
if(embedded == TRUE)
return;
printf("<HTML>\n");
printf("<HEAD>\n");
printf("<link rel=\"shortcut icon\" href=\"%sfavicon.ico\" type=\"image/ico\">\n", url_images_path);
printf("<TITLE>\n");
printf("Nagios Log File\n");
printf("</TITLE>\n");
if(use_stylesheet == TRUE) {
printf("<LINK REL='stylesheet' TYPE='text/css' HREF='%s%s'>\n", url_stylesheets_path, COMMON_CSS);
printf("<LINK REL='stylesheet' TYPE='text/css' HREF='%s%s'>\n", url_stylesheets_path, SHOWLOG_CSS);
}
printf("</HEAD>\n");
printf("<BODY CLASS='showlog'>\n");
/* include user SSI header */
include_ssi_files(SHOWLOG_CGI, SSI_HEADER);
return;
}
void document_footer(void) {
if(embedded == TRUE)
return;
/* include user SSI footer */
include_ssi_files(SHOWLOG_CGI, SSI_FOOTER);
printf("</BODY>\n");
printf("</HTML>\n");
return;
}
int process_cgivars(void) {
char **variables;
int error = FALSE;
int x;
variables = getcgivars();
for(x = 0; variables[x] != NULL; x++) {
/* do some basic length checking on the variable identifier to prevent buffer overflows */
if(strlen(variables[x]) >= MAX_INPUT_BUFFER - 1) {
continue;
}
/* we found the archive argument */
else if(!strcmp(variables[x], "archive")) {
x++;
if(variables[x] == NULL) {
error = TRUE;
break;
}
log_archive = atoi(variables[x]);
if(log_archive < 0)
log_archive = 0;
}
/* we found the order argument */
else if(!strcmp(variables[x], "oldestfirst")) {
use_lifo = FALSE;
}
/* we found the embed option */
else if(!strcmp(variables[x], "embedded"))
embedded = TRUE;
/* we found the noheader option */
else if(!strcmp(variables[x], "noheader"))
display_header = FALSE;
/* we found the nofrills option */
else if(!strcmp(variables[x], "nofrills"))
display_frills = FALSE;
/* we found the notimebreaks option */
else if(!strcmp(variables[x], "notimebreaks"))
display_timebreaks = FALSE;
/* we received an invalid argument */
else
error = TRUE;
}
/* free memory allocated to the CGI variables */
free_cgivars(variables);
return error;
}
/* display the contents of the log file */
int display_log(void) {
char *input = NULL;
char image[MAX_INPUT_BUFFER];
char image_alt[MAX_INPUT_BUFFER];
time_t t;
char *temp_buffer = NULL;
char date_time[MAX_DATETIME_LENGTH];
int error = FALSE;
mmapfile *thefile = NULL;
char last_message_date[MAX_INPUT_BUFFER] = "";
char current_message_date[MAX_INPUT_BUFFER] = "";
struct tm *time_ptr = NULL;
/* check to see if the user is authorized to view the log file */
if(is_authorized_for_system_information(&current_authdata) == FALSE) {
printf("<HR>\n");
printf("<DIV CLASS='errorMessage'>It appears as though you do not have permission to view the log file...</DIV><br><br>\n");
printf("<DIV CLASS='errorDescription'>If you believe this is an error, check the HTTP server authentication requirements for accessing this CGI<br>and check the authorization options in your CGI configuration file.</DIV>\n");
printf("<HR>\n");
return ERROR;
}
error = FALSE;
if(use_lifo == TRUE) {
error = read_file_into_lifo(log_file_to_use);
if(error != LIFO_OK) {
if(error == LIFO_ERROR_MEMORY) {
printf("<P><DIV CLASS='warningMessage'>Not enough memory to reverse log file - displaying log in natural order...</DIV></P>");
error = FALSE;
}
else
error = TRUE;
use_lifo = FALSE;
}
else
error = FALSE;
}
if(use_lifo == FALSE) {
if((thefile = mmap_fopen(log_file_to_use)) == NULL) {
printf("<HR>\n");
printf("<P><DIV CLASS='errorMessage'>Error: Could not open log file '%s' for reading!</DIV></P>", log_file_to_use);
printf("<HR>\n");
error = TRUE;
}
}
if(error == FALSE) {
printf("<P><DIV CLASS='logEntries'>\n");
while(1) {
free(input);
if(use_lifo == TRUE) {
if((input = pop_lifo()) == NULL)
break;
}
else if((input = mmap_fgets(thefile)) == NULL)
break;
strip(input);
if(strstr(input, " starting...")) {
strcpy(image, START_ICON);
strcpy(image_alt, START_ICON_ALT);
}
else if(strstr(input, " shutting down...")) {
strcpy(image, STOP_ICON);
strcpy(image_alt, STOP_ICON_ALT);
}
else if(strstr(input, "Bailing out")) {
strcpy(image, STOP_ICON);
strcpy(image_alt, STOP_ICON_ALT);
}
else if(strstr(input, " restarting...")) {
strcpy(image, RESTART_ICON);
strcpy(image_alt, RESTART_ICON_ALT);
}
else if(strstr(input, "HOST ALERT:") && strstr(input, ";DOWN;")) {
strcpy(image, HOST_DOWN_ICON);
strcpy(image_alt, HOST_DOWN_ICON_ALT);
}
else if(strstr(input, "HOST ALERT:") && strstr(input, ";UNREACHABLE;")) {
strcpy(image, HOST_UNREACHABLE_ICON);
strcpy(image_alt, HOST_UNREACHABLE_ICON_ALT);
}
else if(strstr(input, "HOST ALERT:") && (strstr(input, ";RECOVERY;") || strstr(input, ";UP;"))) {
strcpy(image, HOST_UP_ICON);
strcpy(image_alt, HOST_UP_ICON_ALT);
}
else if(strstr(input, "HOST NOTIFICATION:")) {
strcpy(image, HOST_NOTIFICATION_ICON);
strcpy(image_alt, HOST_NOTIFICATION_ICON_ALT);
}
else if(strstr(input, "SERVICE ALERT:") && strstr(input, ";CRITICAL;")) {
strcpy(image, CRITICAL_ICON);
strcpy(image_alt, CRITICAL_ICON_ALT);
}
else if(strstr(input, "SERVICE ALERT:") && strstr(input, ";WARNING;")) {
strcpy(image, WARNING_ICON);
strcpy(image_alt, WARNING_ICON_ALT);
}
else if(strstr(input, "SERVICE ALERT:") && strstr(input, ";UNKNOWN;")) {
strcpy(image, UNKNOWN_ICON);
strcpy(image_alt, UNKNOWN_ICON_ALT);
}
else if(strstr(input, "SERVICE ALERT:") && (strstr(input, ";RECOVERY;") || strstr(input, ";OK;"))) {
strcpy(image, OK_ICON);
strcpy(image_alt, OK_ICON_ALT);
}
else if(strstr(input, "SERVICE NOTIFICATION:")) {
strcpy(image, NOTIFICATION_ICON);
strcpy(image_alt, NOTIFICATION_ICON_ALT);
}
else if(strstr(input, "SERVICE EVENT HANDLER:")) {
strcpy(image, SERVICE_EVENT_ICON);
strcpy(image_alt, SERVICE_EVENT_ICON_ALT);
}
else if(strstr(input, "HOST EVENT HANDLER:")) {
strcpy(image, HOST_EVENT_ICON);
strcpy(image_alt, HOST_EVENT_ICON_ALT);
}
else if(strstr(input, "EXTERNAL COMMAND:")) {
strcpy(image, EXTERNAL_COMMAND_ICON);
strcpy(image_alt, EXTERNAL_COMMAND_ICON_ALT);
}
else if(strstr(input, "PASSIVE SERVICE CHECK:")) {
strcpy(image, PASSIVE_ICON);
strcpy(image_alt, "Passive Service Check");
}
else if(strstr(input, "PASSIVE HOST CHECK:")) {
strcpy(image, PASSIVE_ICON);
strcpy(image_alt, "Passive Host Check");
}
else if(strstr(input, "LOG ROTATION:")) {
strcpy(image, LOG_ROTATION_ICON);
strcpy(image_alt, LOG_ROTATION_ICON_ALT);
}
else if(strstr(input, "active mode...")) {
strcpy(image, ACTIVE_ICON);
strcpy(image_alt, ACTIVE_ICON_ALT);
}
else if(strstr(input, "standby mode...")) {
strcpy(image, STANDBY_ICON);
strcpy(image_alt, STANDBY_ICON_ALT);
}
else if(strstr(input, "SERVICE FLAPPING ALERT:") && strstr(input, ";STARTED;")) {
strcpy(image, FLAPPING_ICON);
strcpy(image_alt, "Service started flapping");
}
else if(strstr(input, "SERVICE FLAPPING ALERT:") && strstr(input, ";STOPPED;")) {
strcpy(image, FLAPPING_ICON);
strcpy(image_alt, "Service stopped flapping");
}
else if(strstr(input, "SERVICE FLAPPING ALERT:") && strstr(input, ";DISABLED;")) {
strcpy(image, FLAPPING_ICON);
strcpy(image_alt, "Service flap detection disabled");
}
else if(strstr(input, "HOST FLAPPING ALERT:") && strstr(input, ";STARTED;")) {
strcpy(image, FLAPPING_ICON);
strcpy(image_alt, "Host started flapping");
}
else if(strstr(input, "HOST FLAPPING ALERT:") && strstr(input, ";STOPPED;")) {
strcpy(image, FLAPPING_ICON);
strcpy(image_alt, "Host stopped flapping");
}
else if(strstr(input, "HOST FLAPPING ALERT:") && strstr(input, ";DISABLED;")) {
strcpy(image, FLAPPING_ICON);
strcpy(image_alt, "Host flap detection disabled");
}
else if(strstr(input, "SERVICE DOWNTIME ALERT:") && strstr(input, ";STARTED;")) {
strcpy(image, SCHEDULED_DOWNTIME_ICON);
strcpy(image_alt, "Service entered a period of scheduled downtime");
}
else if(strstr(input, "SERVICE DOWNTIME ALERT:") && strstr(input, ";STOPPED;")) {
strcpy(image, SCHEDULED_DOWNTIME_ICON);
strcpy(image_alt, "Service exited a period of scheduled downtime");
}
else if(strstr(input, "SERVICE DOWNTIME ALERT:") && strstr(input, ";CANCELLED;")) {
strcpy(image, SCHEDULED_DOWNTIME_ICON);
strcpy(image_alt, "Service scheduled downtime has been cancelled");
}
else if(strstr(input, "HOST DOWNTIME ALERT:") && strstr(input, ";STARTED;")) {
strcpy(image, SCHEDULED_DOWNTIME_ICON);
strcpy(image_alt, "Host entered a period of scheduled downtime");
}
else if(strstr(input, "HOST DOWNTIME ALERT:") && strstr(input, ";STOPPED;")) {
strcpy(image, SCHEDULED_DOWNTIME_ICON);
strcpy(image_alt, "Host exited a period of scheduled downtime");
}
else if(strstr(input, "HOST DOWNTIME ALERT:") && strstr(input, ";CANCELLED;")) {
strcpy(image, SCHEDULED_DOWNTIME_ICON);
strcpy(image_alt, "Host scheduled downtime has been cancelled");
}
else {
strcpy(image, INFO_ICON);
strcpy(image_alt, INFO_ICON_ALT);
}
temp_buffer = strtok(input, "]");
t = (temp_buffer == NULL) ? 0L : strtoul(temp_buffer + 1, NULL, 10);
time_ptr = localtime(&t);
strftime(current_message_date, sizeof(current_message_date), "%B %d, %Y %H:00\n", time_ptr);
current_message_date[sizeof(current_message_date) - 1] = '\x0';
if(strcmp(last_message_date, current_message_date) != 0 && display_timebreaks == TRUE) {
printf("<BR CLEAR='all'>\n");
printf("<DIV CLASS='dateTimeBreak'>\n");
printf("<table border=0 width=95%%><tr>");
printf("<td width=40%%><hr width=100%%></td>");
printf("<td align=center CLASS='dateTimeBreak'>%s</td>", current_message_date);
printf("<td width=40%%><hr width=100%%></td>");
printf("</tr></table>\n");
printf("</DIV>\n");
printf("<BR CLEAR='all'><DIV CLASS='logEntries'>\n");
strncpy(last_message_date, current_message_date, sizeof(last_message_date));
last_message_date[sizeof(last_message_date) - 1] = '\x0';
}
get_time_string(&t, date_time, (int)sizeof(date_time), SHORT_DATE_TIME);
strip(date_time);
temp_buffer = strtok(NULL, "\n");
if(display_frills == TRUE)
printf("<img align='left' src='%s%s' alt='%s' title='%s'>", url_images_path, image, image_alt, image_alt);
printf("[%s] %s", date_time, (temp_buffer == NULL) ? "" : html_encode(temp_buffer, FALSE));
if(enable_splunk_integration == TRUE) {
printf("&nbsp;&nbsp;&nbsp;");
display_splunk_generic_url(temp_buffer, 2);
}
printf("<br clear='all'>\n");
}
printf("</DIV></P>\n");
printf("<HR>\n");
free(input);
if(use_lifo == FALSE)
mmap_fclose(thefile);
}
if(use_lifo == TRUE)
free_lifo_memory();
return OK;
}
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