#define VERSION 2
-#define MAXPACKETSIZE (65536 - 60 - 8) /* TODO: What are the magic numbers? */
-#define DEFAULTDATALEN (64 - 8) /* TODO: What are the magic numbers? */
-
/* ICMP header contains: type, code, checksum, identifier and sequence number. */
#define ICMP_ECHO_HEADER_BYTES 8
#define ICMP_ECHO_DATA_BYTES sizeof(struct timeval)
#define ICMP_ECHO_PACKET_BYTES ICMP_ECHO_HEADER_BYTES + ICMP_ECHO_DATA_BYTES
+#define IP_PACKET_MAX_BYTES 65535
/* Minimum time in seconds between pings. If this value is increased above the */
/* `ping_interval` for a given host, some pings to that host may not be sent. */
#define TIMER_RESOLUTION 1
-/* Must be larger than the length of the longest configuration key (currently 'start_condition'). */
-#define MAXCONFKEYLEN 20
+/* Must be larger than the length of the longest configuration key (not value). */
+/* For example: MAX_CONF_KEY_LEN > strlen("start_condition") */
+#define MAX_CONF_KEY_LEN 20
/* One struct per host as listed in the config file. */
struct host_entry {
/* Globals */
/* Since the program is based around signals, a linked list of hosts is maintained here. */
- static struct host_entry * first_host_in_list = NULL;
+ struct host_entry * first_host_in_list = NULL;
/* Set by command line flags. */
- static bool verbose = false;
- static bool retry_down_cmd = false;
+ bool verbose = false;
+ bool retry_down_cmd = false;
/*
* Generate an Internet Checksum per RFC 1071.
return result;
}
-size_t
-gcd(const size_t x, const size_t y)
-{
- size_t remainder = x % y;
- if (remainder == 0) return y;
- return gcd(y, remainder);
-}
-
void
remove_host_from_list(struct host_entry * host)
{