/*
* Send a UDP packet.
*/
int
__udp_send(char *buf, int len, ip_route_t *dest_ip,
word dest_port, word src_port)
{
pktbuf_t *pkt;
udp_header_t *udp;
ip_header_t *ip;
unsigned short cksum;
int ret;
/* dumb */
if (len > MAX_UDP_DATA)
return -1;
/* just drop it if can't get a buffer */
if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL)
return -1;
udp = pkt->udp_hdr;
ip = pkt->ip_hdr;
pkt->pkt_bytes = len + sizeof(udp_header_t);
udp->src_port = htons(src_port);
udp->dest_port = htons(dest_port);
udp->length = htons(pkt->pkt_bytes);
udp->checksum = 0;
memcpy(((char *)udp) + sizeof(udp_header_t), buf, len);
/* fill in some pseudo-header fields */
memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
memcpy(ip->destination, dest_ip->ip_addr, sizeof(ip_addr_t));
ip->protocol = IP_PROTO_UDP;
ip->length = udp->length;
cksum = __sum((word *)udp, pkt->pkt_bytes, __pseudo_sum(ip));
udp->checksum = htons(cksum);
ret = __ip_send(pkt, IP_PROTO_UDP, dest_ip);
__pktbuf_free(pkt);
return ret;
}
static void do_ping(int argc, char *argv[])
{
struct option_info opts[7];
long count, timeout, length, rate, start_time, end_time, timer,
received, tries;
char *local_ip_addr, *host_ip_addr;
bool local_ip_addr_set, host_ip_addr_set, count_set,
timeout_set, length_set, rate_set, verbose;
struct sockaddr_in local_addr, host_addr;
ip_addr_t hold_addr;
icmp_header_t *icmp;
pktbuf_t *pkt;
ip_header_t *ip;
unsigned short cksum;
ip_route_t dest_ip;
init_opts(&opts[0], 'n', true, OPTION_ARG_TYPE_NUM,
(void *)&count, (bool *) & count_set,
"<count> - number of packets to test");
init_opts(&opts[1], 't', true, OPTION_ARG_TYPE_NUM, (void *)&timeout,
(bool *) & timeout_set,
"<timeout> - max #ms per packet [rount trip]");
init_opts(&opts[2], 'i', true, OPTION_ARG_TYPE_STR,
(void *)&local_ip_addr, (bool *) & local_ip_addr_set,
"local IP address");
init_opts(&opts[3], 'h', true, OPTION_ARG_TYPE_STR,
(void *)&host_ip_addr, (bool *) & host_ip_addr_set,
"host name or IP address");
init_opts(&opts[4], 'l', true, OPTION_ARG_TYPE_NUM, (void *)&length,
(bool *) & length_set, "<length> - size of payload");
init_opts(&opts[5], 'v', false, OPTION_ARG_TYPE_FLG, (void *)&verbose,
(bool *) 0, "verbose operation");
init_opts(&opts[6], 'r', true, OPTION_ARG_TYPE_NUM, (void *)&rate,
(bool *) & rate_set, "<rate> - time between packets");
if (!scan_opts(argc, argv, 1, opts, 7, (void **)0, 0, "")) {
diag_printf("PING - Invalid option specified\n");
return;
}
// Set defaults; this has to be done _after_ the scan, since it will
// have destroyed all values not explicitly set.
if (local_ip_addr_set) {
if (!_gethostbyname(local_ip_addr, (in_addr_t *) & local_addr)) {
diag_printf("PING - Invalid local name: %s\n",
local_ip_addr);
return;
}
} else {
memcpy((in_addr_t *) & local_addr, __local_ip_addr,
sizeof(__local_ip_addr));
}
if (host_ip_addr_set) {
if (!_gethostbyname(host_ip_addr, (in_addr_t *) & host_addr)) {
diag_printf("PING - Invalid host name: %s\n",
host_ip_addr);
return;
}
if (__arp_lookup((ip_addr_t *) & host_addr.sin_addr, &dest_ip) <
0) {
diag_printf("PING: Cannot reach server '%s' (%s)\n",
host_ip_addr,
inet_ntoa((in_addr_t *) & host_addr));
return;
}
} else {
diag_printf("PING - host name or IP address required\n");
return;
}
#define DEFAULT_LENGTH 64
#define DEFAULT_COUNT 10
#define DEFAULT_TIMEOUT 1000
#define DEFAULT_RATE 1000
if (!rate_set) {
rate = DEFAULT_RATE;
}
if (!length_set) {
length = DEFAULT_LENGTH;
}
if ((length < 64) || (length > 1400)) {
diag_printf("Invalid length specified: %ld\n", length);
return;
}
if (!count_set) {
count = DEFAULT_COUNT;
}
if (!timeout_set) {
timeout = DEFAULT_TIMEOUT;
}
// Note: two prints here because 'inet_ntoa' returns a static pointer
diag_printf("Network PING - from %s",
inet_ntoa((in_addr_t *) & local_addr));
diag_printf(" to %s\n", inet_ntoa((in_addr_t *) & host_addr));
received = 0;
__icmp_install_listener(handle_icmp);
// Save default "local" address
memcpy(hold_addr, __local_ip_addr, sizeof(hold_addr));
for (tries = 0; tries < count; tries++) {
// The network stack uses the global variable '__local_ip_addr'
memcpy(__local_ip_addr, &local_addr, sizeof(__local_ip_addr));
// Build 'ping' request
if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) {
// Give up if no packets - something is wrong
break;
}
icmp = pkt->icmp_hdr;
ip = pkt->ip_hdr;
pkt->pkt_bytes = length + sizeof(icmp_header_t);
icmp->type = ICMP_TYPE_ECHOREQUEST;
icmp->code = 0;
icmp->checksum = 0;
icmp->seqnum = htons(tries + 1);
cksum = __sum((word *) icmp, pkt->pkt_bytes, 0);
icmp->checksum = htons(cksum);
memcpy(ip->source, (in_addr_t *) & local_addr,
sizeof(ip_addr_t));
memcpy(ip->destination, (in_addr_t *) & host_addr,
sizeof(ip_addr_t));
ip->protocol = IP_PROTO_ICMP;
ip->length = htons(pkt->pkt_bytes);
__ip_send(pkt, IP_PROTO_ICMP, &dest_ip);
__pktbuf_free(pkt);
start_time = MS_TICKS();
timer = start_time + timeout;
icmp_received = false;
while (!icmp_received && (MS_TICKS_DELAY() < timer)) {
if (_rb_break(1)) {
goto abort;
}
MS_TICKS_DELAY();
__enet_poll();
}
end_time = MS_TICKS();
timer = MS_TICKS() + rate;
while (MS_TICKS_DELAY() < timer) {
if (_rb_break(1)) {
goto abort;
}
MS_TICKS_DELAY();
__enet_poll();
}
if (icmp_received) {
received++;
if (verbose) {
diag_printf(" seq: %ld, time: %ld (ticks)\n",
ntohs(hold_hdr.seqnum),
end_time - start_time);
}
}
}
abort:
__icmp_remove_listener();
// Clean up
memcpy(__local_ip_addr, &hold_addr, sizeof(__local_ip_addr));
// Report
diag_printf("PING - received %ld of %ld expected\n", received, count);
}
/*
* Find the ethernet address of the machine with the given
* ip address.
* Return 0 and fills in 'eth_addr' if successful,
* -1 if unsuccessful.
*/
int
__arp_request(ip_addr_t *ip_addr, enet_addr_t *eth_addr, int allow_self)
{
pktbuf_t *pkt;
arp_header_t *arp;
unsigned long retry_start;
enet_addr_t bcast_addr;
int retry;
if (!allow_self) {
// Special case request for self
if (!memcmp(ip_addr, __local_ip_addr, 4)) {
memcpy(eth_addr, __local_enet_addr, sizeof(enet_addr_t));
return 0;
}
}
/* just fail if can't get a buffer */
if ((pkt = __pktbuf_alloc(ARP_PKT_SIZE)) == NULL)
return -1;
arp = pkt->arp_hdr;
arp->opcode = htons(ARP_REQUEST);
arp->hw_type = htons(ARP_HW_ETHER);
arp->protocol = htons(0x800);
arp->hw_len = sizeof(enet_addr_t);
arp->proto_len = sizeof(ip_addr_t);
memcpy(arp->sender_ip, __local_ip_addr, sizeof(ip_addr_t));
memcpy(arp->sender_enet, __local_enet_addr, sizeof(enet_addr_t));
memcpy(arp->target_ip, ip_addr, sizeof(ip_addr_t));
bcast_addr[0] = 255;
bcast_addr[1] = 255;
bcast_addr[2] = 255;
bcast_addr[3] = 255;
bcast_addr[4] = 255;
bcast_addr[5] = 255;
arp_req.eth = (char *)eth_addr;
arp_req.ip = (char *)ip_addr;
arp_req.waiting = 1;
retry = 8;
while (retry-- > 0) {
/* send the packet */
pkt->pkt_bytes = sizeof(arp_header_t);
__enet_send(pkt, &bcast_addr, ETH_TYPE_ARP);
retry_start = MS_TICKS();
while ((MS_TICKS_DELAY() - retry_start) < 250) {
__enet_poll();
if (!arp_req.waiting) {
__pktbuf_free(pkt);
return 0;
}
}
}
__pktbuf_free(pkt);
return -1;
}
