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Code Issues Releases Wiki Activity

Native ICMP proof of concept

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M66B 2016-01-26 09:02:07 +01:00
parent e2b14108fb
commit 84c10f803e
1 changed files with 55 additions and 0 deletions
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55
app/src/main/jni/netguard/netguard.c
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@ -33,6 +33,8 @@
#include <netinet/ip6.h>
#include <netinet/udp.h>
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp6.h>
#include "netguard.h"
@ -365,6 +367,59 @@ void *handle_events(void *a) {
stopping = 0;
signaled = 0;
log_android(ANDROID_LOG_WARN, "ICMP opening");
int isock = socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
if (isock < 0)
log_android(ANDROID_LOG_ERROR, "ICMP socket error %d: %s", errno, strerror(errno));
else {
log_android(ANDROID_LOG_WARN, "ICMP opened");
struct sockaddr_in addr;
memset(&addr, 0, sizeof addr);
addr.sin_family = AF_INET;
inet_pton(AF_INET, "8.8.8.8", &addr.sin_addr);
size_t len = sizeof(struct icmp) + 5;
uint8_t *buffer = malloc(len);
struct icmp *icmp_msg = (struct icmp *) buffer;
memset(icmp_msg, 0, sizeof(struct icmp));
icmp_msg->icmp_type = ICMP_ECHO;
icmp_msg->icmp_id = htons(1234);
memset(buffer + sizeof(struct icmp), 0x41, 5);
for (int seq = 0; seq < 3; seq++) {
icmp_msg->icmp_seq = htons(seq);
if (sendto(isock, buffer, len, 0, (struct sockaddr *) &addr, sizeof addr) < 0)
log_android(ANDROID_LOG_ERROR, "ICMP sendto error %d: %s", errno, strerror(errno));
else
log_android(ANDROID_LOG_WARN, "ICMP send seq %d", seq);
}
for (int seq = 0; seq < 3; seq++) {
FD_ZERO(&rfds);
FD_SET(isock, &rfds);
ts.tv_sec = 10;
ts.tv_nsec = 0;
int r = select(isock + 1, &rfds, NULL, NULL, &ts);
if (r > 0) {
uint8_t rbuffer[500];
struct icmp *icmp_reply = (struct icmp *) rbuffer;
if (recv(isock, rbuffer, sizeof(rbuffer), 0) < 0)
log_android(ANDROID_LOG_ERROR, "ICMP recv error %d: %s",
errno, strerror(errno));
else {
log_android(ANDROID_LOG_WARN, "ICMP reply seq %d", ntohs(icmp_reply->icmp_seq));
}
}
}
free(buffer);
if (close(isock))
log_android(ANDROID_LOG_ERROR, "ICMP close error %d: %s", errno, strerror(errno));
}
// Loop
while (1) {
log_android(ANDROID_LOG_DEBUG, "Loop thread %lu", thread_id);