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Merge pull request #3311 from authmillenon/ng_icmpv6_echo/fix/unexpected-parameter-problem

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ng_icmpv6_echo: fix unexpected parameter problem
This commit is contained in:
Peter Kietzmann 2015-07-08 09:10:15 +02:00
commit 8456c9c3fe
1 changed files with 30 additions and 15 deletions
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45
sys/shell/commands/sc_icmpv6_echo.c
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@ -32,7 +32,8 @@
#include "vtimer.h"
static uint16_t id = 0x53;
static uint16_t seq = 1;
static uint16_t min_seq_expected = 0;
static uint16_t max_seq_expected = 0;
static char ipv6_str[NG_IPV6_ADDR_MAX_STR_LEN];
static void usage(char **argv)
@ -46,18 +47,29 @@ void _set_payload(ng_icmpv6_echo_t *hdr, size_t payload_len)
uint8_t *payload = (uint8_t *)(hdr + 1);
while (i < payload_len) {
if (seq > 0xff) {
payload[i] = (uint8_t)(seq >> 8);
payload[i + 1] = (uint8_t)(seq & 0xff);
if (id > 0xff) {
payload[i] = (uint8_t)(id >> 8);
payload[i + 1] = (uint8_t)(id & 0xff);
i += 2;
}
else {
payload[i++] = (uint8_t)(seq & 0xff);
payload[i++] = (uint8_t)(id & 0xff);
}
}
if (i > payload_len) {
payload[payload_len - 1] = seq >> 8;
if (i > payload_len) { /* when id > 0xff and payload_len is odd */
payload[payload_len - 1] = id >> 8;
}
}
static inline bool _expected_seq(uint16_t seq)
{
/* take integer overflows in account */
if (min_seq_expected > max_seq_expected) {
return (seq >= min_seq_expected) || (seq <= max_seq_expected);
}
else {
return (seq >= min_seq_expected) && (seq <= max_seq_expected);
}
}
@ -66,6 +78,7 @@ int _handle_reply(ng_pktsnip_t *pkt, uint64_t time)
ng_pktsnip_t *ipv6, *icmpv6;
ng_ipv6_hdr_t *ipv6_hdr;
ng_icmpv6_echo_t *icmpv6_hdr;
uint16_t seq;
LL_SEARCH_SCALAR(pkt, ipv6, type, NG_NETTYPE_IPV6);
LL_SEARCH_SCALAR(pkt, icmpv6, type, NG_NETTYPE_ICMPV6);
@ -77,15 +90,18 @@ int _handle_reply(ng_pktsnip_t *pkt, uint64_t time)
ipv6_hdr = ipv6->data;
icmpv6_hdr = icmpv6->data;
seq = byteorder_ntohs(icmpv6_hdr->seq);
if ((byteorder_ntohs(icmpv6_hdr->id) == id) && _expected_seq(seq)) {
if (seq <= min_seq_expected) {
min_seq_expected++;
}
if ((byteorder_ntohs(icmpv6_hdr->id) == id) &&
(byteorder_ntohs(icmpv6_hdr->seq) == seq)) {
timex_t rt = timex_from_uint64(time);
printf("%u bytes from %s: id=%" PRIu16 " seq=%" PRIu16 " hop limit=%" PRIu8
" time = %" PRIu32 ".%03" PRIu32 " ms\n", (unsigned) icmpv6->size,
ng_ipv6_addr_to_str(ipv6_str, &(ipv6_hdr->src), sizeof(ipv6_str)),
byteorder_ntohs(icmpv6_hdr->id), byteorder_ntohs(icmpv6_hdr->seq),
ipv6_hdr->hl,
byteorder_ntohs(icmpv6_hdr->id), seq, ipv6_hdr->hl,
(rt.seconds * SEC_IN_MS) + (rt.microseconds / MS_IN_USEC),
rt.microseconds % MS_IN_USEC);
ng_ipv6_nc_still_reachable(&ipv6_hdr->src);
@ -156,7 +172,8 @@ int _icmpv6_ping(int argc, char **argv)
ng_pktsnip_t *pkt;
timex_t start, stop, timeout = { 5, 0 };
pkt = ng_icmpv6_echo_req_build(id, seq, NULL, payload_len);
pkt = ng_icmpv6_echo_req_build(id, ++max_seq_expected, NULL,
payload_len);
if (pkt == NULL) {
puts("error: packet buffer full");
@ -207,11 +224,9 @@ int _icmpv6_ping(int argc, char **argv)
else {
puts("ping timeout");
}
seq++;
}
seq = 1;
max_seq_expected = 0;
id++;
ng_netreg_unregister(NG_NETTYPE_ICMPV6, &my_entry);