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


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:	1.33
Committed:	Sat Mar 8 20:41:46 2003 UTC (21 years, 2 months ago) by pajs
Content type:	text/plain
Branch:	MAIN
Changes since 1.32:	+72 -1 lines
Log Message:	Created a strlcpy function to get it working with OS's that do not have it. This function was lifted straight out of openssh code, and its licence for that function is in the comment for it. I also moved errno around so strlcpy will work with it. I've left the #ifndef HAVE_STRLCAT line commented out for now until tim modifys the configure stuff to check for it or not :)