diff options
| -rw-r--r-- | networking/ping.c | 44 |
1 files changed, 16 insertions, 28 deletions
diff --git a/networking/ping.c b/networking/ping.c index 9bf3813..4c1ec83 100644 --- a/networking/ping.c +++ b/networking/ping.c @@ -302,13 +302,21 @@ static void pingstats(int junk ATTRIBUTE_UNUSED) exit(status); } -static void sendping_tail(void (*sp)(int), int sz, int sizeof_packet) +static void sendping_tail(void (*sp)(int), const void *pkt, int size_pkt) { + int sz; + + CLR((uint16_t)ntransmitted % MAX_DUP_CHK); + ntransmitted++; + + /* sizeof(pingaddr) can be larger than real sa size, but I think + * it doesn't matter */ + sz = sendto(pingsock, pkt, size_pkt, 0, &pingaddr.sa, sizeof(pingaddr)); if (sz < 0) bb_perror_msg_and_die("sendto"); - if (sz != sizeof_packet) + if (sz != size_pkt) bb_error_msg_and_die("ping wrote %d chars; %d expected", sz, - sizeof_packet); + size_pkt); signal(SIGALRM, sp); if (pingcount == 0 || ntransmitted < pingcount) { /* schedule next in 1s */ @@ -322,51 +330,31 @@ static void sendping_tail(void (*sp)(int), int sz, int sizeof_packet) static void sendping4(int junk ATTRIBUTE_UNUSED) { - struct icmp *pkt; - int i; - char packet[datalen + ICMP_MINLEN]; - - pkt = (struct icmp *) packet; + struct icmp *pkt = alloca(datalen + ICMP_MINLEN); pkt->icmp_type = ICMP_ECHO; pkt->icmp_code = 0; pkt->icmp_cksum = 0; pkt->icmp_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */ pkt->icmp_id = myid; - CLR((uint16_t)ntransmitted % MAX_DUP_CHK); - ntransmitted++; - gettimeofday((struct timeval *) &pkt->icmp_dun, NULL); - pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet)); - - i = sendto(pingsock, packet, sizeof(packet), 0, - &pingaddr.sa, sizeof(pingaddr.sin)); + pkt->icmp_cksum = in_cksum((unsigned short *) pkt, datalen + ICMP_MINLEN); - sendping_tail(sendping4, i, sizeof(packet)); + sendping_tail(sendping4, pkt, datalen + ICMP_MINLEN); } #if ENABLE_PING6 static void sendping6(int junk ATTRIBUTE_UNUSED) { - struct icmp6_hdr *pkt; - int i; - char packet[datalen + sizeof (struct icmp6_hdr)]; - - pkt = (struct icmp6_hdr *) packet; + struct icmp6_hdr *pkt = alloca(datalen + sizeof(struct icmp6_hdr)); pkt->icmp6_type = ICMP6_ECHO_REQUEST; pkt->icmp6_code = 0; pkt->icmp6_cksum = 0; pkt->icmp6_seq = htons(ntransmitted); /* don't ++ here, it can be a macro */ pkt->icmp6_id = myid; - CLR((uint16_t)ntransmitted % MAX_DUP_CHK); - ntransmitted++; - gettimeofday((struct timeval *) &pkt->icmp6_data8[4], NULL); - i = sendto(pingsock, packet, sizeof(packet), 0, - &pingaddr.sa, sizeof(pingaddr.sin6)); - - sendping_tail(sendping6, i, sizeof(packet)); + sendping_tail(sendping6, pkt, datalen + sizeof(struct icmp6_hdr)); } #endif |