source/ihost/ihost.c

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org.uk
 * Copyright (C) 2000-2002 i-scream
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdarg.h>
#include <errno.h>
#include <netdb.h>

#include "ukcprog.h"
#include "statgrab.h"

#define LOG_CRIT 0
#define LOG_ERR 1
#define LOG_INFO 2 
#define LOG_DEBUG 3

typedef struct{
        int filtermanager_port;
        char *filtermanager_host;

        char *host_ip;
        char *host_fqdn;

        char *server_fqdn;
        int server_udp_port;
        
        /* Weird stuff iscream wants sent to it */
        char *last_modified;
        char *file_list;

        int udp_update_time;
//      int config_ttl;

        time_t config_ttl;

}ihost_state_t;

typedef struct{
        int verbose;
        int daemon;

        FILE *log;
}ihost_config_t;        

typedef struct{
        struct sockaddr_in addr;
        int sock;
}udp_sockinfo_t;

ihost_config_t ihost_config;

extern int errno;

/* Taken from the OpenSSH code. Its licence included in function.*/
#ifndef HAVE_STRLCAT

/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Appends src to string dst of size siz (unlike strncat, siz is the
 * full size of dst, not space left).  At most siz-1 characters
 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
 * If retval >= siz, truncation occurred.
 */
size_t
strlcat(dst, src, siz)
        char *dst;
        const char *src;
        size_t siz;
{
        register char *d = dst;
        register const char *s = src;
        register size_t n = siz;
        size_t dlen;

        /* Find the end of dst and adjust bytes left but don't go past end */
        while (n-- != 0 && *d != '\0')
                d++;
        dlen = d - dst;
        n = siz - dlen;

        if (n == 0)
                return(dlen + strlen(s));
        while (*s != '\0') {
                if (n != 1) {
                        *d++ = *s;
                        n--;
                }
                s++;
        }
        *d = '\0';

        return(dlen + (s - src));       /* count does not include NUL */
}

#endif
/* End strlcat function taken from OpenSSH */

void log_msg(int level, char *format, ...){
        int cur_errno;
        va_list ap;

        cur_errno=errno;

        if(level<=ihost_config.verbose){
                va_start(ap, format);
                vfprintf(ihost_config.log, format, ap);
                va_end(ap);
                if(level==LOG_CRIT){
                        fprintf(ihost_config.log, " (%s)\n", strerror(cur_errno));
                }else{
                        fprintf(ihost_config.log, "\n");
                }
        }
}

/* Takes many pointers, checks if they are NULL or not, and then free's them */
/* Deprciated - and i only wrote it today! :)
void m_free(int num_pointers, ...){
        int x=0;
        va_list ap;
        void *p;

        va_start(ap, num_pointers);
        for(;x<num_pointers;x++){
                p=va_arg(ap, void*);
                if(p!=NULL){
                        free(p);
                }
        }
        va_end(ap);
}
*/

int create_udp_sockinfo(udp_sockinfo_t *udp_sockinfo, char *hostname, int port){

        struct in_addr haddr;

        log_msg(LOG_DEBUG, "Resolving name for udp connection");
        if(get_host_addr(hostname, &haddr) != 0){
                log_msg(LOG_CRIT, "Failed to lookup name");
                return 1;
        }

        if((udp_sockinfo->sock=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0){
                log_msg(LOG_CRIT, "Failed to create UDP socket");
                return 1;
        }

        memset(&(udp_sockinfo->addr), 0, sizeof(struct sockaddr_in));
        udp_sockinfo->addr.sin_family=AF_INET;
        memcpy((char *)&(udp_sockinfo->addr.sin_addr), &haddr, sizeof(haddr));
        udp_sockinfo->addr.sin_port = htons(port);

        log_msg(LOG_DEBUG, "Socket created");
        return 0;
}

FILE *create_tcp_connection(char *hostname, int port){
        int sock;
        struct sockaddr_in addr;
        struct in_addr haddr;
        FILE *f;

        log_msg(LOG_DEBUG, "Creating tcp socket");      
        if((sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))<0){
                log_msg(LOG_CRIT, "Failed to make TCP Socket");
                return NULL;
        }

        if((get_host_addr(hostname, &haddr))!=0){
                log_msg(LOG_CRIT, "Failed to lookup name for %s", hostname);
                return NULL;
        }

        memset(&addr, 0, sizeof(addr));
        addr.sin_family = AF_INET;
        memcpy(&addr.sin_addr, &haddr, sizeof(haddr));
        addr.sin_port = htons(port);

        log_msg(LOG_DEBUG, "Creating a tcp connection");
        if(connect(sock, (struct sockaddr *)&addr, sizeof(addr)) !=0){
                log_msg(LOG_CRIT, "Failed to connect to hostname %s on port %d", hostname, port);
                return NULL;
        }

        if((f=fdopen(sock, "r+"))==NULL){
                log_msg(LOG_CRIT, "Failed to connect to open filedescriptor on tcp connection");
                close(sock);
                return NULL;
        }

        return f;
}

int tcp_comm(FILE *f, char *send, char **response, char *expected){

        log_msg(LOG_DEBUG, "Sending %s", send);
        fprintf(f, "%s\n", send);
        fflush(f);
        *response=fpgetline(f);
        fseek(f, 0, SEEK_CUR);

        if(*response!=NULL) log_msg(LOG_DEBUG, "Recieved %s", *response);

        if( (*response==NULL) || (strcmp(*response, "ERROR")==0) ) return -1;
        
        if(expected==NULL) return 0;

        if((strcmp(expected, *response))==0) return 0;

        log_msg(LOG_DEBUG, "Did not get expected response");
        return -1;
}

int tcp_comm_strdup(FILE *f, char *send, char **response, char *expected){
        if((tcp_comm(f, send, response, expected))!=0){ 
                return -1;
        }

        *response=strdup(*response);
        if (response==NULL) return -1;

        return 0;
}
        
int ihost_getconfig(ihost_state_t *ihost_state){

        FILE *tcp_con;
        char *response;
        char *response_ptr;

        /* Keep these in case of a failure and so it can keep running on the old config */
        char *file_list=NULL;   
        char *last_modified=NULL;
        char *host_fqdn=NULL;
        char *host_ip=NULL;
        int udp_update_time=0;
        char *server_fqdn=NULL;
        int server_udp_port=0;
        time_t config_ttl=0;

        if((tcp_con=create_tcp_connection(ihost_state->filtermanager_host, ihost_state->filtermanager_port))==NULL){
                goto error;
        }

        if(ihost_state->file_list!=NULL || ihost_state->last_modified!=NULL){
                if(tcp_con==NULL){
                        goto error;
                }       
        
                if((tcp_comm(tcp_con, "CHECKCONFIG", &response, "OK"))!=0){
                        goto error;
                }
        
                if((tcp_comm(tcp_con, ihost_state->file_list, &response, "OK"))!=0){
                        goto error;
                }
        
                if((tcp_comm(tcp_con, ihost_state->last_modified, &response, "OK"))==0){
                        if((tcp_comm(tcp_con, "END", &response, "OK"))!=0){
                                goto error;
                        }
                        fclose(tcp_con);
                        return 0;
                }else{
                        if((strcmp(response, "EXPIRED"))!=0){
                                goto error;
                        }
                }
        }

        /* If we got to here, the config must of expired */

        if((tcp_comm(tcp_con, "STARTCONFIG", &response, "OK"))!=0){
                goto error;
        }

        if((tcp_comm_strdup(tcp_con, "LASTMODIFIED", &response, NULL))!=0){
                goto error;
        }
        last_modified=response;
                        
        if((tcp_comm_strdup(tcp_con, "FILELIST", &response, NULL))!=0){
                goto error;
        }
        file_list=response;

        if((tcp_comm_strdup(tcp_con, "FQDN", &response, NULL))!=0){
                goto error;
        }
        host_fqdn=response;

        if((tcp_comm_strdup(tcp_con, "IP", &response, NULL))!=0){
                goto error;
        }
        host_ip=response;

        if((tcp_comm(tcp_con, "UDPUpdateTime", &response, NULL))!=0){
                goto error;
        }
        udp_update_time=atoi(response);

        if((tcp_comm(tcp_con, "ConfigTTL", &response, NULL))!=0){
                goto error;
        }
        config_ttl=atoi(response);

        if((tcp_comm(tcp_con, "ENDCONFIG", &response, NULL))!=0){
                goto error;
        }

        if((tcp_comm(tcp_con, "FILTER", &response, NULL))!=0){
                goto error;
        }else{
                response_ptr=strchr(response,';');
                if(response_ptr==NULL){
                        log_msg(LOG_ERR, "Incorrect data sent by server");
                        goto error;
                }
                *response_ptr='\0';
                server_fqdn=strdup(response);
                if(server_fqdn==NULL){
                        goto error;
                }
                response_ptr++;
                if(response_ptr==NULL){
                        log_msg(LOG_ERR, "Incorrect data sent by server");
                        goto error;
                }

                printf("string : %s\n", response_ptr);
                server_udp_port=atoi(response_ptr);

                if (server_udp_port==0){
                        log_msg(LOG_ERR, "Incorrect data sent by server");
                        goto error;
                }
        }
        
        if((tcp_comm(tcp_con, "END", &response, "OK"))!=0){
                goto error;
        }

        fclose(tcp_con);

        /* We have the data we need, and its all been read correctly */

        /* Free the old data before pointing them to the new data. m_free copes should
         * this already be NULL */
        if(ihost_state->file_list!=NULL) free(ihost_state->file_list);
        if(ihost_state->last_modified!=NULL) free(ihost_state->last_modified);
        if(ihost_state->host_fqdn!=NULL) free(ihost_state->host_fqdn);
        if(ihost_state->server_fqdn!=NULL) free(ihost_state->server_fqdn);
        if(ihost_state->host_ip!=NULL) free(ihost_state->host_ip);

        ihost_state->file_list=file_list;
        ihost_state->last_modified=last_modified;
        ihost_state->host_fqdn=host_fqdn;
        ihost_state->host_ip=host_ip;
        ihost_state->server_fqdn=server_fqdn;
        ihost_state->server_udp_port=server_udp_port;
        ihost_state->udp_update_time=udp_update_time;
        ihost_state->config_ttl=config_ttl;

        log_msg(LOG_DEBUG, "UDP Update time %d", udp_update_time);
        log_msg(LOG_DEBUG, "Configure ttl %d", config_ttl);

        return 0;

error:

        if(file_list!=NULL) free(file_list);
        if(last_modified!=NULL) free(last_modified);
        if(host_fqdn!=NULL) free(host_fqdn);
        if(server_fqdn!=NULL) free(server_fqdn);
        if(host_ip!=NULL) free(host_ip);
        fclose(tcp_con);

        return -1;
}

int get_system_stats(int seq_no, ihost_state_t *ihost_state, char *xml, int size){
        char tmp[size];
        cpu_percent_t *cpu_percent;     
        mem_stat_t *mem_stats;
        load_stat_t *load_stats;
        user_stat_t *user_stats;
        swap_stat_t *swap_stats;
        general_stat_t *general_stats;
        disk_stat_t *disk_stats;
        diskio_stat_t *diskio_stats;
        process_stat_t *process_stats;
        network_stat_t *network_stats;
        page_stat_t *page_stats;
        int disk_entries=0;
        int diskio_entries=0;
        int network_entries=0;

        int counter;
        long long x;
        long long y;

        /* Print start of the packet we want */
        snprintf(xml, size, "<packet seq_no=\"%d\" machine_name=\"%s\" date=\"%ld\" type=\"data\" ip=\"%s\">", \
                 seq_no, ihost_state->host_fqdn, time(NULL), ihost_state->host_ip);

        /* Get cpu stats, check it is correct, then fill in its entry for the xml */
        if((cpu_percent=cpu_percent_usage())==NULL){
                log_msg(LOG_CRIT, "Failed to get cpu statistics");
        }else{
                snprintf(tmp, size, \
                        "<cpu><user>%3.2f</user><kernel>%3.2f</kernel><idle>%3.2f</idle><iowait>%3.2f</iowait><swap>%3.2f</swap></cpu>", \
                        cpu_percent->user, \
                        cpu_percent->kernel, \
                        cpu_percent->idle, \
                        cpu_percent->iowait, \
                        cpu_percent->swap);

                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        }

        
        /*Get mem stats, and fill in xml */     
        if((mem_stats=get_memory_stats())==NULL){
                log_msg(LOG_CRIT, "Failed to get memory statistics");
        }else{
                snprintf(tmp, size, \
                        "<memory><total>%lld</total><free>%lld</free><used>%lld</used><cache>%lld</cache></memory>", \
                        mem_stats->total, \
                        mem_stats->free, \
                        mem_stats->used, \
                        mem_stats->cache);
                
                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        }


        /* Get load stats */    
        if((load_stats=get_load_stats())==NULL){
                log_msg(LOG_CRIT, "Failed to get load statistics");
        }else{
                snprintf(tmp, size, \
                        "<load><load1>%.2lf</load1><load5>%.2lf</load5><load15>%.2lf</load15></load>", \
                        load_stats->min1, \
                        load_stats->min5, \
                        load_stats->min15);
                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        }


        /* get user stats */
        
        if((user_stats=get_user_stats())==NULL){
                log_msg(LOG_CRIT, "Failed to get user statistics");
        }else{

                snprintf(tmp, size, \
                        "<users><list>%s</list><count>%d</count></users>", \
                        user_stats->name_list, \
                        user_stats->num_entries);
                
                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        }


        /* swap stats */
        if((swap_stats=get_swap_stats())==NULL){
                log_msg(LOG_CRIT, "Failed to get swap statistics");     
        }else{
                snprintf(tmp, size, \
                        "<swap><total>%lld</total><used>%lld</used><free>%lld</free></swap>",\
                        swap_stats->total, \
                        swap_stats->used, \
                        swap_stats->free);
        
                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        }


        /* general stats */
        
        if((general_stats=get_general_stats())==NULL){
                log_msg(LOG_CRIT, "Failed to get general statistics");
        }else{
                snprintf(tmp, size, \
                        "<os><name>%s</name><release>%s</release><version>%s</version><sysname>%s</sysname><platform>%s</platform><uptime>%ld</uptime></os>", \
                        general_stats->os_name, \
                        general_stats->os_release, \
                        general_stats->os_version, \
                        general_stats->hostname, \
                        general_stats->platform, \
                        (long)general_stats->uptime);
                
                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        
        }

        
        /* process stats */
        if((process_stats=get_process_stats())==NULL){  
                log_msg(LOG_CRIT, "Failed to get general statistics");
        }else{
                snprintf(tmp, size, \
                        "<processes><sleeping>%d</sleeping><cpu>%d</cpu><zombie>%d</zombie><stopped>%d</stopped><total>%d</total></processes>",\
                        process_stats->sleeping, \
                        process_stats->running, \
                        process_stats->zombie, \
                        process_stats->stopped, \
                        process_stats->total);

                if(strlcat(xml, tmp, size) >= size) goto too_big_error;

        }


        /* Get paging stats */
        if((page_stats=get_page_stats_diff())==NULL){
                log_msg(LOG_CRIT, "Failed to get paging statistics");
        }else{
                if(page_stats->systime!=0){
                        x=page_stats->pages_pagein / page_stats->systime;
                        y=page_stats->pages_pageout / page_stats->systime;
                }else{
                        x=page_stats->pages_pagein;
                        y=page_stats->pages_pageout;
                }
                snprintf(tmp, size, \
                        "<pages><swapins>%lld</swapins><swapouts>%lld</swapouts></pages>", \
                        x, \
                        y);
        
                if(strlcat(xml, tmp, size) >= size) goto too_big_error;
        }


        /* get diskio stats */
        
        if((diskio_stats=get_diskio_stats_diff(&diskio_entries))==NULL){
                log_msg(LOG_CRIT, "Failed to get diskio statistics");
        }else{
                strlcat(xml, "<diskio>", size);
                for(counter=0;counter<diskio_entries;counter++){

                        if(diskio_stats->systime!=0){
                                x=diskio_stats->read_bytes / diskio_stats->systime;
                                y=diskio_stats->write_bytes / diskio_stats->systime;
                        }else{
                                x=diskio_stats->read_bytes;
                                y=diskio_stats->write_bytes;
                        }
        
                        snprintf(tmp, size, \
                                "<p%d name=\"%s\" rbytes=\"%lld\" wbytes=\"%lld\"></p%d>", \
                                counter, \
                                diskio_stats->disk_name, \
                                x, \
                                y, \
                                counter);

                        strlcat(xml, tmp, size);
                        diskio_stats++;
                }

                if(strlcat(xml, "</diskio>", size) >= size) goto too_big_error;

        }

        
        /* get networks stats */
        
        if((network_stats=get_network_stats_diff(&network_entries))==NULL){
                log_msg(LOG_CRIT, "Failed to get network statistics");
        }else{
                strlcat(xml, "<net>", size);
                for(counter=0;counter<network_entries;counter++){
                        if(network_stats->systime!=0){
                                x=network_stats->rx / network_stats->systime;
                                y=network_stats->tx / network_stats->systime;
                        }else{
                                x=network_stats->rx;
                                y=network_stats->tx;
                        }

                        snprintf(tmp, size, \
                                "<p%d name=\"%s\" rx=\"%lld\" tx=\"%lld\"></p%d>", \
                                counter, \
                                network_stats->interface_name, \
                                x, \
                                y, \
                                counter);

                        strlcat(xml, tmp, size);
                        network_stats++;
                }

                if(strlcat(xml, "</net>", size) >= size) goto too_big_error;

        }


        /* get disk stats */
        
        if((disk_stats=get_disk_stats(&disk_entries))==NULL){
                log_msg(LOG_CRIT, "Failed to get disk statistics");
        }else{
                strlcat(xml, "<disk>", size);
                for(counter=0;counter<disk_entries;counter++){
                        snprintf(tmp, size, \
                                "<p%d name=\"%s\" mount=\"%s\" fstype=\"%s\" total=\"%lld\" used=\"%lld\" avail=\"%lld\" totalinodes=\"%lld\" usedinodes=\"%lld\" freeinodes=\"%lld\"></p%d>", \
                                counter, \
                                disk_stats->device_name, \
                                disk_stats->mnt_point, \
                                disk_stats->fs_type, \
                                disk_stats->size, \
                                disk_stats->used, \
                                disk_stats->avail, \
                                disk_stats->total_inodes, \
                                disk_stats->used_inodes, \
                                disk_stats->free_inodes, \
                                counter);

                        strlcat(xml, tmp, size);

                        disk_stats++;
                }

                if(strlcat(xml, "</disk>", size) >= size) goto too_big_error;

        }
        

        if(strlcat(xml, "</packet>", size) >= size) goto too_big_error;

        /*If we got to here, it should of all been filled in nicely now */
        return 0;

too_big_error:
        log_msg(LOG_ERR, "UDP Packet is too large. Throwing away the packet");
        return -1;
}


void usage(char *progname){
        fprintf(stderr, "Usage %s [options] server port\n", progname);
        fprintf(stderr, "Options\n");
        fprintf(stderr, "  -v           Verbose mode,-vv would make even more verbose\n");
        fprintf(stderr, "  -f           Foreground mode, print errors to stderr\n");
        fprintf(stderr, "  -V           Print version number\n");
        fprintf(stderr, "  -h           Prints this help page\n");
        exit(1);
}

int main(int argc, char **argv){

        ihost_state_t ihost_state;
        udp_sockinfo_t udp_sockinfo;
        
        int cmdopt;
        extern int optind;
        pid_t pid;
        FILE *f;
        int packet_num=0;
        int len;

        char packet[MAX_UDP_PACKET_SIZE];

        time_t cur_time, sleep_delay, udp_time=0, config_time=0;

        /* Set default settings */      
        ihost_config.verbose=1;
        ihost_config.daemon=1;
        /* Set all errors to go down stderr until told otherwise */
        ihost_config.log=stderr;

        /* Blank ihost_state to default settings */
        ihost_state.filtermanager_host=NULL;
        ihost_state.host_fqdn=NULL;
        ihost_state.host_ip=NULL;
        ihost_state.server_fqdn=NULL;
        ihost_state.file_list=NULL;
        ihost_state.last_modified=NULL;

        while((cmdopt=getopt(argc, argv, "vfhV")) != -1){
                switch(cmdopt){
                        case 'v':
                                ihost_config.verbose++;
                                break;

                        case 'f':
                                /* Force syslog logging since stderr will be closed in this case */
                                ihost_config.daemon=0;
                                break;

                        case 'h':
                                usage(argv[0]);
                                break;

                        case 'V':
                                fprintf(stderr, "%s version %s\n", argv[0], VERSION);
                                break;

                        default:
                                usage(argv[0]);
                                exit(1);
                }
        }

        if(argc!=optind+2){
                usage(argv[0]);
                exit(1);
        }

        ihost_state.filtermanager_host=strdup(argv[optind]);
        ihost_state.filtermanager_port=atoi(argv[optind+1]);
        
        if(gethostbyname(ihost_state.filtermanager_host)==NULL){
                log_msg(LOG_CRIT, "Failed to lookup hostname. Please check settings");
                exit(1);
        }
        if(ihost_state.filtermanager_port==0){
                log_msg(LOG_ERR, "Invalid port number");
                exit(1);
        }

        if(ihost_config.daemon){
                pid=fork();
                if(pid==-1){
                        log_msg(LOG_CRIT, "Failed to background exiting");
                        exit(1);        
                }else if(pid!=0){
                        /* Parent process */
                        return 0;
                }
                /* We should now be in the background*/
                if(setsid()==-1){
                        log_msg(LOG_CRIT, "setsid failed");
                        exit(1);
                }
        
                if((ihost_config.log=fopen(LOG_FILE, "a"))==NULL){
                        ihost_config.log=stderr;
                        log_msg(LOG_CRIT, "Failed to open Logfiles %s for writing", LOG_FILE);
                        exit(1);
                }

                fclose(stdin);
                fclose(stdout);
                fclose(stderr);

        }

        log_msg(LOG_INFO, "Starting ihost");
        
        log_msg(LOG_DEBUG,"Writing PID FILE");

        pid=getpid();

        if((f=fopen(PID_FILE,"w")) == NULL){
                log_msg(LOG_CRIT, "Failed to write PID file");
        }else{
                if((fprintf(f,"%d",(int)pid)) <= 0 ){
                        log_msg(LOG_CRIT, "Failed to write PID file");
                }
                if((fclose(f))!=0){
                        log_msg(LOG_CRIT, "failed to close PID file");
                }
        }

        /* Get the initial config from the filter manager. Should this fail, 
         * wait, and then try again. */

        get_diskio_stats_diff(&packet_num);
        packet_num=0;

        while(ihost_getconfig(&ihost_state)!=0){
                log_msg(LOG_ERR, "Failed to get ihost config");
                sleep(10);
        }

        printf("%s\n%d\n", ihost_state.server_fqdn, ihost_state.server_udp_port);
        while((create_udp_sockinfo(&udp_sockinfo, ihost_state.server_fqdn, ihost_state.server_udp_port))!=0){
                log_msg(LOG_ERR, "Failed to create udp socket");        
                sleep(10);
        }

        config_time=time(NULL)+ihost_state.config_ttl;

        /* Now have config.. collect data and send as often as required */
        for(;;){
                cur_time=time(NULL);

                if(cur_time>=udp_time){
                        if((get_system_stats(packet_num++, &ihost_state, packet, MAX_UDP_PACKET_SIZE))!=0){
                                log_msg(LOG_ERR, "Failed to get system stats");
                        }

                        len=strlen(packet);
                        log_msg(LOG_DEBUG, "Packet size: %d\nPacket: %s\n", len, packet);
                        
                        if((sendto(udp_sockinfo.sock, packet, len, 0, (struct sockaddr *) &udp_sockinfo.addr, sizeof(udp_sockinfo.addr)))!=len){
                                log_msg(LOG_CRIT, "Failed to send packet");
                        }
                        udp_time=cur_time+ihost_state.udp_update_time;
                        log_msg(LOG_DEBUG, "Next packet should be sent on %d", udp_time);
                }
                
                if(cur_time>=config_time){
                        if(ihost_getconfig(&ihost_state)!=0){
                                /* If we can't get the config, try again 5 minutes time */
                                log_msg(LOG_ERR, "Failed to get config, try again 5 minutes time");
                                config_time=time(NULL)+300;
                        }else{
                                close(udp_sockinfo.sock);

                                while((create_udp_sockinfo(&udp_sockinfo, ihost_state.server_fqdn, ihost_state.server_udp_port))!=0){
                                        log_msg(LOG_CRIT, "Failed to create udp socket");
                                        sleep(10);
                                }

                                config_time=time(NULL)+ihost_state.config_ttl;

                                log_msg(LOG_DEBUG, "Config expires on %d\n", ihost_state.config_ttl);
                        }
                }

                sleep_delay=udp_time-time(NULL);
                log_msg(LOG_DEBUG, "Sleeping for %d", sleep_delay);
                if(sleep_delay>0) sleep(sleep_delay);
        }
                        
        return(0);
}
Revision:	1.34
Committed:	Sun Mar 9 00:21:22 2003 UTC (21 years, 2 months ago) by tdb
Content type:	text/plain
Branch:	MAIN
Changes since 1.33:	+5 -4 lines
Log Message:	Add check for strlcat function as Pete requested. This is the sort of thing configure scripts should be used for ;) It'd be nice to see us doing this more often, instead of our guess work based on what we know the OS to be ;)