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Fixing more bugs reported by Ilja, mostly bounds checking

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This commit is contained in:
kris 2008-06-14 06:59:11 +00:00
parent e9a8e327b4
commit 47bc9d4c4f
3 changed files with 22 additions and 11 deletions
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6
traceroute.cc
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@ -435,12 +435,18 @@ Traceroute::readTraceResponses () {
ip2 = (struct ip *) (((char *) ip) + 4 * ip->ip_hl + 8);
if (ip2->ip_p == IPPROTO_TCP) {
tcp = (struct tcp_hdr *) ((u8 *) ip2 + ip2->ip_hl * 4);
if (ntohs(ip2->ip_len) - (ip2->ip_hl * 4) < 2)
break;
sport = htons (tcp->th_sport);
} else if (ip2->ip_p == IPPROTO_UDP) {
udp = (struct udp_hdr *) ((u8 *) ip2 + ip2->ip_hl * 4);
if (ntohs(ip2->ip_len) - (ip2->ip_hl * 4) < 2)
break;
sport = htons (udp->uh_sport);
} else if (ip2->ip_p == IPPROTO_ICMP) {
icmp2 = (struct icmp *) ((char *) ip2 + 4 * ip2->ip_hl);
if (ntohs(ip2->ip_len) - (ip2->ip_hl * 4) < 8)
break;
sport = ntohs(icmp2->icmp_id);
} else {
sport = htons(ip2->ip_id);