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Fix truncated pings results when packets are too small. Also check for packet maximum size, so that busybox's ping could not be responsible for flooding hosts. 

SVN-Revision: 6443
This commit is contained in:
Florian Fainelli 2007-02-28 19:45:36 +00:00
parent 2a7df08119
commit 9c6fe16260
1 changed files with 42 additions and 0 deletions
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42
package/busybox/patches/450-truncated_ping_results.patch Normal file
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@ -0,0 +1,42 @@
--- busybox-1.4.1/networking/ping.c 2007-01-24 22:34:34.000000000 +0100
+++ busybox-1.4.1.new/networking/ping.c 2007-02-28 20:35:59.000000000 +0100
@@ -70,7 +70,7 @@
struct sockaddr_in pingaddr;
struct icmp *pkt;
int pingsock, c;
- char packet[DEFDATALEN + MAXIPLEN + MAXICMPLEN];
+ char packet[datalen + MAXIPLEN + MAXICMPLEN];
pingsock = create_icmp_socket();
@@ -86,7 +86,7 @@
pkt->icmp_type = ICMP_ECHO;
pkt->icmp_cksum = in_cksum((unsigned short *) pkt, sizeof(packet));
- c = sendto(pingsock, packet, DEFDATALEN + ICMP_MINLEN, 0,
+ c = sendto(pingsock, packet, datalen + ICMP_MINLEN, 0,
(struct sockaddr *) &pingaddr, sizeof(struct sockaddr_in));
if (c < 0) {
@@ -257,8 +257,8 @@
gettimeofday(&tv, NULL);
- /* discard if too short */
- if (sz < (datalen + ICMP_MINLEN))
+ /* discard if too short / long */
+ if (sz < (datalen + ICMP_MINLEN) || sz > (MAXICMPLEN))
return;
/* check IP header */
@@ -274,6 +274,10 @@
++nreceived;
tp = (struct timeval *) icmppkt->icmp_data;
+ /* If packet is too short, results will be truncated */
+ if (sz < (ICMP_MINLEN + sizeof(tv.tv_sec) + sizeof(tv.tv_usec)))
+ return;
+
if ((tv.tv_usec -= tp->tv_usec) < 0) {
--tv.tv_sec;
tv.tv_usec += 1000000;