#define DEFDATALEN (64 - 8) /* default data length */
#define VERSION "ICMPmonitor v1.2 by lord@crocodile.org"
-#define MAX_LOG_MSG_SIZE 4096
# define icmphdr icmp
} monitor_host_t;
/* protos */
-static void log(int type, char *format, ...);
static int gethostaddr(const char *name);
static void read_hosts(const char *cfg_file_name);
static void init_hosts(void);
static unsigned short ident;
static int send_delay = 1;
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+
int main(int ac, char **av)
{
extern char* optarg;
extern int optind;
char *cfgfile=NULL;
int param;
-
- log(LOG_INFO, VERSION " is starting.");
while((param = getopt(ac, av, "rvf:")) != -1)
switch(param)
done(RET_BAD_OPT);
}
- if(!cfgfile)
- {
- log(LOG_WARNING,"No cfg file specified. Assuming 'icmpmonitor.cfg'");
- cfgfile="icmpmonitor.cfg";
+ if (!cfgfile) {
+ fprintf(stderr, "ERROR: No config file specified.\n");
+ exit(EXIT_FAILURE);
}
read_hosts(cfgfile);
{
p->down = 1;
- if(isVerbose)
- log(LOG_INFO,"Host %s in down. Executing DOWN command",p->name);
+ if (isVerbose) printf("INFO: Host %s is down. Executing DOWN command.\n", p->name);
if(!fork())
{
system(p->downcmd);
icp->icmp_seq = p->socket;
icp->icmp_id = ident;
- if(isVerbose)
- log(LOG_INFO,"Sending ICMP packet to %s.",p->name);
+ if (isVerbose) printf("INFO: Sending ICMP packet to %s.\n", p->name);
(void)gettimeofday((struct timeval *)&outpack[8],
(struct timezone *)NULL);
if(i<0 || i!=cc)
{
- if(i<0)
- log(LOG_WARNING,"Sending ICMP packet to %s failed.",p->name);
+ if (i<0) fprintf(stderr, "WARN: Failed sending ICMP packet to %s.\n", p->name);
}
p->sentpackets++;
}
{
if(retval>0)
{
- /* log(LOG_DEBUG,"ICMP data is available now."); */
p=hosts[0];
while(p)
{
}
p=p->next;
}
- } else
- {
- log(LOG_DEBUG,"select returns 0."); /* TODO */
+ } else {
+ /* TODO: How to handle this error? */
}
}
}
(void)gettimeofday(&tv, (struct timezone *)NULL);
fromlen = sizeof(from);
- if((cc = recvfrom(p->socket, buf, sizeof(buf), 0,
- (struct sockaddr *)&from, &fromlen)) < 0)
- {
- if(errno != EINTR)
- log(LOG_WARNING,"Error reading ICMP data from %s.",p->name);
+ if ((cc = recvfrom(p->socket, buf, sizeof(buf), 0, (struct sockaddr *)&from, &fromlen)) < 0) {
+ if (errno != EINTR) fprintf(stderr, "WARN: Error reading ICMP data from %s.\n", p->name);
return;
}
- /* log(LOG_DEBUG,"Got %d bytes of ICMP data from %s.",cc, p->name); */
-
/* check IP header actual len */
ip = (struct ip *)buf ;
iphdrlen = ip->ip_hl<<2 ;
icmp = (struct icmp *) (buf+iphdrlen) ;
- if(cc < iphdrlen+ICMP_MINLEN)
- {
- log(LOG_WARNING,"Received short packet from %s.",p->name);
+ if (cc < iphdrlen + ICMP_MINLEN) {
+ fprintf(stderr, "WARN: Received short packet from %s.\n", p->name);
return;
}
tvsub(&tv, (struct timeval *) &icmp->icmp_data[0]);
delay=tv.tv_sec*1000+(tv.tv_usec/1000);
- if(isVerbose)
- log(LOG_INFO,"Got ICMP reply from %s in %d ms.",p->name,delay);
+ if(isVerbose) printf("INFO: Got ICMP reply from %s in %d ms.\n", p->name, delay);
p->down=0;
if(!p->up)
{
p->up=1;
- if(isVerbose)
- log(LOG_INFO,"Host %s in now up. Executing UP command",p->name);
+ if (isVerbose) printf("INFO: Host %s is up. Executing UP command.\n", p->name);
if(!fork())
{
system(p->upcmd);
wait(NULL);
}
}
- } else
- {
- /*
- log(LOG_DEBUG,"ICMP packet of type %d from %s. Ident=%d",icmp->icmp_type,
- p->name,
- icmp->icmp_id
- );
- */
+ } else {
+ /* TODO: Do anything here? */
}
}
int i,n=0;
struct Cfg *cfg;
- if((cfg=readcfg(cfg_file_name))==NULL)
- {
- log(LOG_ERR,"Error reading cfg. Exiting.");
- done(RET_BAD_CFG);
+ if ((cfg = readcfg(cfg_file_name)) == NULL) {
+ fprintf(stderr, "ERROR: Failed to read config.\n");
+ exit(EXIT_FAILURE);
}
- if(cfg->nelements)
- {
- hosts=malloc(sizeof(monitor_host_t *)*cfg->nelements);
- for(i=0;i<cfg->nelements;i++)
- {
- if(cfg->dict[i]->nvalues<4)
- {
- log(LOG_ERR,"Not enough fields in record %d of cfg file. Got %d.",n, cfg->dict[i]->nvalues+1);
- done(RET_BAD_CFG);
- } else if(cfg->dict[i]->nvalues>5)
- {
- log(LOG_ERR,"Too many fields in record %d of cfg file. Got %d.",n, cfg->dict[i]->nvalues+1);
- done(RET_BAD_CFG);
+ if (cfg->nelements) {
+ hosts = malloc(sizeof(monitor_host_t *) * cfg->nelements);
+ for (i=0; i<cfg->nelements; i++) {
+ if (cfg->dict[i]->nvalues < 4) {
+ fprintf(stderr, "ERROR: Not enough fields in record %d of cfg file. Got %d.\n", n, cfg->dict[i]->nvalues+1);
+ exit(EXIT_FAILURE);
+ } else if (cfg->dict[i]->nvalues>5) {
+ fprintf(stderr, "ERROR: Too many fields in record %d of cfg file. Got %d.\n", n, cfg->dict[i]->nvalues+1);
+ exit(EXIT_FAILURE);
}
- hosts[n]=malloc(sizeof(monitor_host_t));
+ hosts[n] = malloc(sizeof(monitor_host_t));
hosts[n]->name = strdup(cfg->dict[i]->name);
hosts[n]->ping_interval = atoi (cfg->dict[i]->value[0]);
hosts[n]->max_delay = atoi (cfg->dict[i]->value[1]);
{
hosts[n]->down = 0;
hosts[n]->up = 0;
- } else
- {
- log(LOG_ERR,"Illegal value %s in record %n for startup condition.", cfg->dict[i]->value[4], n);
- done(RET_BAD_CFG);
+ } else {
+ fprintf(stderr, "ERROR: Illegal value %s in record %n for startup condition.\n", cfg->dict[i]->value[4], n);
+ exit(EXIT_FAILURE);
}
hosts[n]->sentpackets = 0;
hosts[n]->recvdpackets = 0;
hosts[n]->socket = -1;
- hosts[n]->next = nil;
- if(n>0)
- hosts[n-1]->next=hosts[n];
- (void)gettimeofday(&(hosts[n]->last_ping_received), (struct timezone *)NULL);
+ hosts[n]->next = NULL;
+ if (n > 0) hosts[n-1]->next=hosts[n];
+ gettimeofday(&(hosts[n]->last_ping_received), (struct timezone *)NULL);
n++;
}
freecfg(cfg);
- if(n<=0)
- {
- log(LOG_ERR,"No hosts defined in cfg file, exiting.");
- done(RET_NO_HOSTS);
+ if (n <= 0) {
+ fprintf(stderr, "ERROR: No hosts defined in cfg file, exiting.\n");
+ exit(EXIT_FAILURE);
}
- else
- log(LOG_DEBUG,"%d host(s) found in cfg file,", n);
-
}
static int gethostaddr(const char *name)
struct protoent *proto;
int ok=0;
- if((proto=getprotobyname("icmp"))==NULL)
- {
- log(LOG_ERR,"Unknown protocol: icmp. Exiting.");
- done(RET_INIT_ERROR);
+ if ((proto = getprotobyname("icmp")) == NULL) {
+ fprintf(stderr, "ERROR: Unknown protocol: icmp.\n");
+ exit(EXIT_FAILURE);
}
- while(p)
- {
- log(LOG_DEBUG,"resolving host %s", p->name);
-
+ while(p) {
bzero(&p->dest,sizeof(p->dest));
p->dest.sin_family=AF_INET;
if((p->dest.sin_addr.s_addr=gethostaddr(p->name))<=0)
{
- log(LOG_ERR,"Can't resolve host. Skipping client %s.",p->name);
+ fprintf(stderr, "WARN: Can't resolve host. Skipping client %s.\n", p->name);
p->socket=-1;
} else
{
if((p->socket=socket(AF_INET,SOCK_RAW,proto->p_proto))<0)
{
- log(LOG_ERR,"Can't create socket. Skipping client %s.",p->name);
+ fprintf(stderr, "WARN: Can't create socket. Skipping client %s.\n", p->name);
p->socket=-1;
} else
{
if(!ok)
{
- log(LOG_ERR,"No hosts left to process, exiting.");
- done(RET_NO_HOSTS);
+ fprintf(stderr, "ERROR: No hosts left to process.\n");
+ exit(EXIT_FAILURE);
}
}
exit(code);
}
-/**
- * This function should be used as central logging facility.
- * 'type' argument should be one of following:
- *
- * LOG_EMERG system is unusable
- * LOG_ALERT action must be taken immediately
- * LOG_CRIT critical conditions
- * LOG_ERR error conditions
- * LOG_WARNING warning conditions
- * LOG_NOTICE normal but significant condition
- * LOG_INFO informational
- * LOG_DEBUG debug-level messages
- */
-static void log(int type, char *format, ...)
-{
- va_list ap;
-
-#ifndef DEBUG
- if(type==LOG_DEBUG)
- return;
-#endif
-
- va_start(ap, format);
-
- fprintf(stderr, "icmpmonitor[%d]:", (int)getpid());
- vfprintf(stderr, format, ap);
- fprintf(stderr, "\n");
- va_end(ap);
-}
-
static int gcd(int x, int y)
{
- while(x!=y)
- {
- if(x<y)
- y-=x;
- else
- x-=y;
- }
- return x;
+ int remainder = x % y;
+ if (remainder == 0) return y;
+ return gcd(y, remainder);
}