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#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pingu.h"
#include "xlib.h"
int pingu_verbose = 0;
struct provider {
char *name;
char *interface;
char *pinghost;
char *up_action;
char *down_action;
int status;
};
#if 0
int skip(char **str, int whitespace)
{
char *
while (isspace(*p)) {
if (*p == '\0')
return;
p++;
}
}
#endif
/* note: this overwrite the line buffer */
void parse_line(char *line, char **key, char **value)
{
char *p;
/* strip comments and trailng \n */
p = strpbrk(line, "#\n");
if (p)
*p = '\0';
(*value) = NULL;
if (line[0] == '\0') {
(*key) = NULL;
return;
}
/* skip leading whitespace */
while (isspace(*p)) {
if (*p == '\0')
return;
p++;
}
(*key) = line;
/* find space between keyword and value */
p = line;
while (!isspace(*p)) {
if (*p == '\0')
return;
p++;
}
*p++ = '\0';
/* find value */
while (isspace(*p)) {
if (*p == '\0')
return;
p++;
}
(*value) = p;
}
struct provider **read_config(const char *file)
{
FILE *f = fopen(file, "r");
struct provider *p = NULL;
struct provider **list = NULL;
int i = 0, lineno = 0;
char line[256];
if (f == NULL) {
log_perror(file);
return NULL;
}
while (fgets(line, sizeof(line), f)) {
char *key, *value;
lineno++;
parse_line(line, &key, &value);
if (key == NULL)
continue;
printf("DEBUG: lineno=%i, key='%s', val='%s'\n",
lineno, key, value);
if (strcmp(key, "interface") == 0) {
list = xrealloc(list, (i + 2) * sizeof(struct provider *));
p = xmalloc(sizeof(struct provider));
p->name = xstrdup(value);
list[i] = p;
i++;
} else if (p && strcmp(key, "provider") == 0) {
p->name = xstrdup(value);
} else if (p && strcmp(key, "pinghost") == 0) {
p->pinghost = xstrdup(value);
} else if (p && strcmp(key, "up-action") == 0) {
p->up_action = xstrdup(value);
} else if (p && strcmp(key, "down-action") == 0) {
p->down_action = xstrdup(value);
} else if (p) {
log_error("Unknown keyword '%s' on line %i", key, lineno);
} else {
log_error("provider not specified");
}
}
list[i] = NULL;
return list;
}
static int ping(const char *host)
{
char cmd[280];
snprintf(cmd, sizeof(cmd), "ping -c 1 -q %s", host);
return system(cmd);
}
void usage(int retcode)
{
fprintf(stderr, "usage:\n");
exit(retcode);
}
void ping_loop(char *hosts[], int offline[], int count, int interval)
{
int i;
while (1) {
for (i = 0; i < count; i++) {
int status = (ping(hosts[i]) != 0);
if (status != offline[i]) {
offline[i] = status;
printf("status changed for %s to %i\n",
hosts[i], status);
}
}
sleep(interval);
}
}
int main(int argc, char *argv[])
{
int c;
char *config = "/etc/pingu.conf";
char **hosts;
int *offline;
int hosts_count;
int interval = 30;
const char *script = NULL;
struct provider **providers;
while ((c = getopt(argc, argv, "c:i:s:")) != -1) {
switch (c) {
case 'c':
config = optarg;
break;
case 's':
script = optarg;
break;
case 'i':
interval = atoi(optarg);
break;
}
}
argc -= optind;
argv += optind;
providers = read_config(config);
if (providers == NULL)
return 1;
if (argc == 0)
usage(EXIT_FAILURE);
offline = xmalloc(sizeof(int) * argc);
memset(offline, 0, sizeof(int) * argc);
ping_loop(argv, offline, argc, interval);
free(hosts);
return 0;
}
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