mirror of
https://github.com/yarrick/iodine.git
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Release 0.3.4
This commit is contained in:
Erik Ekman
parent
2b6054a939
commit
1defd22a20
12
CHANGELOG
12
CHANGELOG
@ -7,9 +7,17 @@ iodine - IP over DNS is now easy
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CHANGES:
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2006-11-06: 0.3.3
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2006-11-08: 0.3.4
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- Fixed handshake() buffer overflow
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(Found by poplix, Secunia: SA22674 / FrSIRT/ADV-2006-4333)
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- Added more tests
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- More name parsing enhancements
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- Now runs on Linux/AMD64
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- Added setting to change server port
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2006-11-05: 0.3.3
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- Fixed possible buffer overflow
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(Found by poplix)
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(Found by poplix, Bugtraq ID: 20883)
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- Reworked dns hostname encoding
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2006-09-11: 0.3.2
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17
README
17
README
@ -73,13 +73,22 @@ can be max 63 chars. So your domain name and subdomain should be as short as
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possible to allow maximum throughput.
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TIPS & TRICKS:
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If your port 53 is taken on a specific interface by an application that does
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not use it, use -p on iodined to specify an alternate port (like -p 5353) and
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use for instance iptables (on Linux) to forward the traffic:
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iptables -t nat -A PREROUTING -i eth0 -p udp --dport 53 -j DNAT --to :5353
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(Sent in by Tom Schouten)
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PORTABILITY:
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iodine has been tested on Linux (x86 and SPARC64), FreeBSD (x86), OpenBSD (x86),
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NetBSD (x86) and MacOS X (10.3, ppc, with
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iodine has been tested on Linux (x86, AMD64 and SPARC64), FreeBSD (x86),
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OpenBSD (x86), NetBSD (x86) and MacOS X (10.3, ppc, with
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http://www-user.rhrk.uni-kl.de/~nissler/tuntap/). It should work on other
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unix-like systems as well that has TUN/TAP tunneling support. Let us know if you
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get it to run on other platforms.
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unix-like systems as well that has TUN/TAP tunneling support (after some
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patching). Let us know if you get it to run on other platforms.
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THE NAME:
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19
dns.c
19
dns.c
@ -26,6 +26,7 @@
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#include <time.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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@ -66,7 +67,7 @@ open_dns(const char *domain, int localport, in_addr_t listen_ip)
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int flag;
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struct sockaddr_in addr;
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bzero(&addr, sizeof(addr));
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_port = htons(localport);
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/* listen_ip already in network byte order from inet_addr, or 0 */
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@ -110,7 +111,7 @@ dns_settarget(const char *host)
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return -1;
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}
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bzero(&peer, sizeof(peer));
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memset(&peer, 0, sizeof(peer));
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peer.sin_family = AF_INET;
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peer.sin_port = htons(53);
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peer.sin_addr = *((struct in_addr *) h->h_addr);
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@ -235,7 +236,7 @@ dns_write(int fd, int id, char *buf, int len, char flag)
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char *d;
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avail = 0xFF - strlen(topdomain) - 2;
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bzero(data, sizeof(data));
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memset(data, 0, sizeof(data));
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d = data;
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written = encode_data(buf, len, avail, d, flag);
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encoded = strlen(data);
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@ -286,7 +287,7 @@ int
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dns_parse_reply(char *outbuf, int buflen, char *packet, int packetlen)
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{
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int rv;
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long ttl;
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uint32_t ttl;
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short rlen;
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short type;
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short class;
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@ -309,12 +310,12 @@ dns_parse_reply(char *outbuf, int buflen, char *packet, int packetlen)
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rlen = 0;
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if(qdcount == 1) {
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readname(packet, &data, name, sizeof(name));
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readname(packet, packetlen, &data, name, sizeof(name));
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readshort(packet, &data, &type);
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readshort(packet, &data, &class);
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}
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if(ancount == 1) {
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readname(packet, &data, name, sizeof(name));
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readname(packet, packetlen, &data, name, sizeof(name));
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readshort(packet, &data, &type);
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readshort(packet, &data, &class);
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readlong(packet, &data, &ttl);
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@ -455,7 +456,7 @@ dnsd_read(int fd, struct query *q, char *buf, int buflen)
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qdcount = ntohs(header->qdcount);
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if(qdcount == 1) {
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readname(packet, &data, name, sizeof(name) -1);
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readname(packet, r, &data, name, sizeof(name) -1);
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name[256] = 0;
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readshort(packet, &data, &type);
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readshort(packet, &data, &class);
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@ -469,9 +470,11 @@ dnsd_read(int fd, struct query *q, char *buf, int buflen)
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rv = decodepacket(name, buf, buflen);
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}
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}
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} else {
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} else if (r < 0) { // Error
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perror("recvfrom");
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rv = 0;
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} else { // Packet too small to be dns protocol
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rv = 0;
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}
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return rv;
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@ -127,6 +127,7 @@ encode_data(char *buf, int len, int space, char *dest, char flag)
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chunks = write / RAW_CHUNK;
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leftovers = write % RAW_CHUNK;
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// flag is special character to be placed first in the encoded data
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if (flag != 0) {
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*dest = flag;
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} else {
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@ -135,7 +136,7 @@ encode_data(char *buf, int len, int space, char *dest, char flag)
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}
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dest++;
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bzero(encoded, sizeof(encoded));
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memset(encoded, 0, sizeof(encoded));
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ep = encoded;
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dp = buf;
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for (i = 0; i < chunks; i++) {
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@ -144,7 +145,7 @@ encode_data(char *buf, int len, int space, char *dest, char flag)
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dp += RAW_CHUNK;
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}
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realwrite = ENC_CHUNK * chunks;
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bzero(padding, sizeof(padding));
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memset(padding, 0, sizeof(padding));
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pp = padding;
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if (leftovers) {
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pp += RAW_CHUNK - leftovers;
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@ -187,7 +188,7 @@ decode_data(char *dest, int size, const char *src, char *srcend)
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dest++;
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src++;
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bzero(encoded, sizeof(encoded));
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memset(encoded, 0, sizeof(encoded));
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ep = encoded;
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while(len < size && src < srcend) {
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if(*src == '.') {
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22
iodine.c
22
iodine.c
@ -112,8 +112,8 @@ static int
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handshake(int dns_fd)
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{
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struct timeval tv;
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char server[128];
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char client[128];
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char server[65];
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char client[65];
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char in[4096];
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int timeout;
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fd_set fds;
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@ -144,12 +144,20 @@ handshake(int dns_fd)
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}
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if (read > 0) {
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if (sscanf(in, "%[^-]-%[^-]-%d",
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if (sscanf(in, "%64[^-]-%64[^-]-%d",
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server, client, &mtu) == 3) {
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if (tun_setip(client) == 0 && tun_setmtu(mtu) == 0)
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server[64] = 0;
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client[64] = 0;
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if (tun_setip(client) == 0 &&
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tun_setmtu(mtu) == 0) {
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return 0;
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else
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warn("Received handshake but b0rk");
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} else {
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warn("Received handshake with bad data");
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}
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} else {
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printf("Received bad handshake\n");
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}
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}
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}
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@ -190,7 +198,7 @@ help() {
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static void
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version() {
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printf("iodine IP over DNS tunneling client\n");
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printf("version: 0.3.3 from 2006-11-05\n");
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printf("version: 0.3.4 from 2006-11-08\n");
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exit(0);
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}
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18
iodined.c
18
iodined.c
@ -111,7 +111,7 @@ tunnel(int tun_fd, int dns_fd)
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}
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if(FD_ISSET(dns_fd, &fds)) {
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read = dnsd_read(dns_fd, &q, in, sizeof(in));
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if (read < 0)
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if (read <= 0)
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continue;
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if(in[0] == 'H' || in[0] == 'h') {
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@ -168,7 +168,7 @@ static void
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usage() {
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extern char *__progname;
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printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] "
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printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] [-p port]"
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" tunnel_ip topdomain\n", __progname);
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exit(2);
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}
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@ -178,7 +178,7 @@ help() {
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extern char *__progname;
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printf("iodine IP over DNS tunneling server\n");
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printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] "
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printf("Usage: %s [-v] [-h] [-f] [-u user] [-t chrootdir] [-d device] [-m mtu] [-l ip address to listen on] [-p port]"
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" tunnel_ip topdomain\n", __progname);
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printf(" -v to print version info and exit\n");
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printf(" -h to print this help and exit\n");
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@ -188,6 +188,7 @@ help() {
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printf(" -d device to set tunnel device name\n");
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printf(" -m mtu to set tunnel device mtu\n");
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printf(" -l ip address to listen on for incoming dns traffic (default 0.0.0.0)\n");
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printf(" -p port to listen on for incoming dns traffic (default 53)\n");
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printf("tunnel_ip is the IP number of the local tunnel interface.\n");
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printf("topdomain is the FQDN that is delegated to this server.\n");
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exit(0);
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@ -196,7 +197,7 @@ help() {
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static void
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version() {
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printf("iodine IP over DNS tunneling server\n");
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printf("version: 0.3.3 from 2006-11-05\n");
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printf("version: 0.3.4 from 2006-11-08\n");
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exit(0);
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}
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@ -213,6 +214,7 @@ main(int argc, char **argv)
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int mtu;
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struct passwd *pw;
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in_addr_t listen_ip;
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int port;
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username = NULL;
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newroot = NULL;
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@ -220,13 +222,14 @@ main(int argc, char **argv)
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foreground = 0;
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mtu = 1024;
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listen_ip = INADDR_ANY;
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port = 53;
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packetbuf.len = 0;
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packetbuf.offset = 0;
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outpacket.len = 0;
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q.id = 0;
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while ((choice = getopt(argc, argv, "vfhu:t:d:m:l:")) != -1) {
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while ((choice = getopt(argc, argv, "vfhu:t:d:m:l:p:")) != -1) {
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switch(choice) {
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case 'v':
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version();
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@ -252,6 +255,9 @@ main(int argc, char **argv)
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case 'l':
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listen_ip = inet_addr(optarg);
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break;
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case 'p':
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port = atoi(optarg);
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break;
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default:
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usage();
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break;
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@ -291,7 +297,7 @@ main(int argc, char **argv)
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goto cleanup0;
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if (tun_setip(argv[0]) != 0 || tun_setmtu(mtu) != 0)
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goto cleanup1;
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if ((dnsd_fd = open_dns(argv[1], 53, listen_ip)) == -1)
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if ((dnsd_fd = open_dns(argv[1], port, listen_ip)) == -1)
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goto cleanup2;
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my_ip = inet_addr(argv[0]);
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42
read.c
42
read.c
@ -15,14 +15,16 @@
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*/
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#include <string.h>
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#include <stdint.h>
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static int
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readname_loop(char *packet, char **src, char *dst, size_t length, size_t loop)
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readname_loop(char *packet, int packetlen, char **src, char *dst, size_t length, size_t loop)
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{
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char *dummy;
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char *s;
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char *d;
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int len;
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int offset;
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char c;
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if (loop <= 0)
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@ -36,8 +38,18 @@ readname_loop(char *packet, char **src, char *dst, size_t length, size_t loop)
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/* is this a compressed label? */
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if((c & 0xc0) == 0xc0) {
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dummy = packet + (((s[-1] & 0x3f) << 8) | s[0]);
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len += readname_loop(packet, &dummy, d, length - len, loop - 1);
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offset = (((s[-1] & 0x3f) << 8) | (s[0] & 0xff));
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if (offset > packetlen) {
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if (len == 0) {
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// Bad jump first in packet
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return 0;
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} else {
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// Bad jump after some data
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break;
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}
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}
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dummy = packet + offset;
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len += readname_loop(packet, packetlen, &dummy, d, length - len, loop - 1);
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goto end;
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}
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@ -65,9 +77,9 @@ end:
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}
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int
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readname(char *packet, char **src, char *dst, size_t length)
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readname(char *packet, int packetlen, char **src, char *dst, size_t length)
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{
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return readname_loop(packet, src, dst, length, 10);
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return readname_loop(packet, packetlen, src, dst, length, 10);
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}
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int
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@ -83,19 +95,20 @@ readshort(char *packet, char **src, short *dst)
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}
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int
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readlong(char *packet, char **src, long *dst)
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readlong(char *packet, char **src, uint32_t *dst)
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{
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// A long as described in dns protocol is always 32 bits
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unsigned char *p;
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p = *src;
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*dst = ((long)p[0] << 24)
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| ((long)p[1] << 16)
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| ((long)p[2] << 8)
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| ((long)p[3]);
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*dst = ((uint32_t)p[0] << 24)
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| ((uint32_t)p[1] << 16)
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| ((uint32_t)p[2] << 8)
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| ((uint32_t)p[3]);
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|
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(*src) += sizeof(long);
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return sizeof(long);
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(*src) += sizeof(uint32_t);
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return sizeof(uint32_t);
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}
|
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|
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int
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@ -135,8 +148,9 @@ putshort(char **dst, short value)
|
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}
|
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|
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int
|
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putlong(char **dst, long value)
|
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putlong(char **dst, uint32_t value)
|
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{
|
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// A long as described in dns protocol is always 32 bits
|
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unsigned char *p;
|
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|
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p = *dst;
|
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@ -147,7 +161,7 @@ putlong(char **dst, long value)
|
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*p++ = (value);
|
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|
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(*dst) = p;
|
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return sizeof(long);
|
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return sizeof(uint32_t);
|
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}
|
||||
|
||||
int
|
||||
|
||||
6
read.h
6
read.h
@ -17,14 +17,14 @@
|
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#ifndef _READ_H_
|
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#define _READ_H_
|
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|
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int readname(char *, char **, char *, size_t);
|
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int readname(char *, int, char **, char *, size_t);
|
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int readshort(char *, char **, short *);
|
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int readlong(char *, char **, long *);
|
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int readlong(char *, char **, uint32_t *);
|
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int readdata(char *, char **, char *, size_t);
|
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|
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int putbyte(char **, char);
|
||||
int putshort(char **, short);
|
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int putlong(char **, long);
|
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int putlong(char **, uint32_t);
|
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int putdata(char **, char *, size_t);
|
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|
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#endif
|
||||
|
||||
86
test.c
86
test.c
@ -23,11 +23,13 @@
|
||||
#include <arpa/nameser8_compat.h>
|
||||
#endif
|
||||
#include <stdio.h>
|
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#include <stdint.h>
|
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#include <stdlib.h>
|
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#include <string.h>
|
||||
#include <assert.h>
|
||||
|
||||
#include "structs.h"
|
||||
#include "encoding.h"
|
||||
#include "dns.h"
|
||||
#include "read.h"
|
||||
|
||||
@ -73,10 +75,10 @@ static void
|
||||
test_readputlong()
|
||||
{
|
||||
char buf[4];
|
||||
long putint;
|
||||
long tempi;
|
||||
long tint;
|
||||
long *l;
|
||||
uint32_t putint;
|
||||
uint32_t tempi;
|
||||
uint32_t tint;
|
||||
uint32_t *l;
|
||||
char* p;
|
||||
int i;
|
||||
|
||||
@ -89,13 +91,13 @@ test_readputlong()
|
||||
p = buf;
|
||||
putlong(&p, tint);
|
||||
l = &putint;
|
||||
memcpy(l, buf, sizeof(int));
|
||||
memcpy(l, buf, sizeof(uint32_t));
|
||||
if (putint != tempi) {
|
||||
printf("Bad value on putlong for %d\n", i);
|
||||
exit(2);
|
||||
}
|
||||
l = &tempi;
|
||||
memcpy(buf, l, sizeof(int));
|
||||
memcpy(buf, l, sizeof(uint32_t));
|
||||
p = buf;
|
||||
readlong(NULL, &p, &tempi);
|
||||
if (tempi != tint) {
|
||||
@ -129,6 +131,13 @@ test_readname()
|
||||
char onejump[] =
|
||||
"AA\x81\x80\x00\x01\x00\x00\x00\x00\x00\x00"
|
||||
"\x02hh\xc0\x15\x00\x01\x00\x01\x05zBCDE\x00";
|
||||
char badjump[] = {
|
||||
'A', 'A', 0x81, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0xfe, 0xcc, 0x00, 0x01, 0x00, 0x01 };
|
||||
char badjump2[] = {
|
||||
'A', 'A', 0x81, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
||||
0x02, 'B', 'A', 0xfe, 0xcc, 0x00, 0x01, 0x00, 0x01 };
|
||||
char *jumper;
|
||||
char buf[1024];
|
||||
char *data;
|
||||
int rv;
|
||||
@ -136,29 +145,51 @@ test_readname()
|
||||
printf(" * Testing readname... ");
|
||||
fflush(stdout);
|
||||
|
||||
bzero(buf, sizeof(buf));
|
||||
memset(buf, 0, sizeof(buf));
|
||||
data = emptyloop + sizeof(HEADER);
|
||||
buf[1023] = 'A';
|
||||
rv = readname(emptyloop, &data, buf, 1023);
|
||||
rv = readname(emptyloop, sizeof(emptyloop), &data, buf, 1023);
|
||||
assert(buf[1023] == 'A');
|
||||
|
||||
bzero(buf, sizeof(buf));
|
||||
memset(buf, 0, sizeof(buf));
|
||||
data = infloop + sizeof(HEADER);
|
||||
buf[4] = '\a';
|
||||
rv = readname(infloop, &data, buf, 4);
|
||||
rv = readname(infloop, sizeof(infloop), &data, buf, 4);
|
||||
assert(buf[4] == '\a');
|
||||
|
||||
bzero(buf, sizeof(buf));
|
||||
memset(buf, 0, sizeof(buf));
|
||||
data = longname + sizeof(HEADER);
|
||||
buf[256] = '\a';
|
||||
rv = readname(longname, &data, buf, 256);
|
||||
rv = readname(longname, sizeof(longname), &data, buf, 256);
|
||||
assert(buf[256] == '\a');
|
||||
|
||||
bzero(buf, sizeof(buf));
|
||||
memset(buf, 0, sizeof(buf));
|
||||
data = onejump + sizeof(HEADER);
|
||||
rv = readname(onejump, &data, buf, 256);
|
||||
rv = readname(onejump, sizeof(onejump), &data, buf, 256);
|
||||
assert(rv == 9);
|
||||
|
||||
// These two tests use malloc to cause segfault if jump is executed
|
||||
memset(buf, 0, sizeof(buf));
|
||||
jumper = malloc(sizeof(badjump));
|
||||
if (jumper) {
|
||||
memcpy(jumper, badjump, sizeof(badjump));
|
||||
data = jumper + sizeof(HEADER);
|
||||
rv = readname(jumper, sizeof(badjump), &data, buf, 256);
|
||||
assert(rv == 0);
|
||||
}
|
||||
free(jumper);
|
||||
|
||||
memset(buf, 0, sizeof(buf));
|
||||
jumper = malloc(sizeof(badjump2));
|
||||
if (jumper) {
|
||||
memcpy(jumper, badjump2, sizeof(badjump2));
|
||||
data = jumper + sizeof(HEADER);
|
||||
rv = readname(jumper, sizeof(badjump2), &data, buf, 256);
|
||||
assert(rv == 4);
|
||||
assert(strcmp("BA.", buf) == 0);
|
||||
}
|
||||
free(jumper);
|
||||
|
||||
printf("OK\n");
|
||||
}
|
||||
|
||||
@ -170,6 +201,7 @@ test_encode_hostname() {
|
||||
|
||||
len = 256;
|
||||
printf(" * Testing hostname encoding... ");
|
||||
fflush(stdout);
|
||||
|
||||
memset(buf, 0, 256);
|
||||
ret = dns_encode_hostname( // More than 63 chars between dots
|
||||
@ -189,6 +221,31 @@ test_encode_hostname() {
|
||||
printf("OK\n");
|
||||
}
|
||||
|
||||
static void
|
||||
test_base32() {
|
||||
char temp[256];
|
||||
char *start = "HELLOTEST";
|
||||
char *out = "1HELLOTEST";
|
||||
char *end;
|
||||
char *tempend;
|
||||
int codedlength;
|
||||
|
||||
printf(" * Testing base32 encoding... ");
|
||||
fflush(stdout);
|
||||
|
||||
memset(temp, 0, sizeof(temp));
|
||||
end = malloc(16);
|
||||
memset(end, 0, 16);
|
||||
|
||||
codedlength = encode_data(start, 9, 256, temp, 0);
|
||||
tempend = temp + strlen(temp);
|
||||
decode_data(end, 16, temp, tempend);
|
||||
assert(strcmp(out, end) == 0);
|
||||
free(end);
|
||||
|
||||
printf("OK\n");
|
||||
}
|
||||
|
||||
int
|
||||
main()
|
||||
{
|
||||
@ -198,6 +255,7 @@ main()
|
||||
test_readputlong();
|
||||
test_readname();
|
||||
test_encode_hostname();
|
||||
test_base32();
|
||||
|
||||
printf("** All went well :)\n");
|
||||
return 0;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user