mirror of
https://github.com/yarrick/iodine.git
synced 2024-11-27 12:05:15 +00:00
#36, upstream traffic now sent in raw mode
This commit is contained in:
Erik Ekman
Erik Ekman
parent
02c06d742f
commit
58d9615160
15
src/common.h
15
src/common.h
@ -21,8 +21,13 @@
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#define RAW_HDR_LEN 4
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#define RAW_HDR_IDENT_LEN 3
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#define RAW_HDR_CMD 3
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#define RAW_HDR_CMD_LOGIN 0x01
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#define RAW_HDR_CMD_DATA 0x02
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#define RAW_HDR_CMD_LOGIN 0x10
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#define RAW_HDR_CMD_DATA 0x20
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#define RAW_HDR_CMD_MASK 0xF0
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#define RAW_HDR_USR_MASK 0x0F
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#define RAW_HDR_GET_CMD(x) ((x)[RAW_HDR_CMD] & RAW_HDR_CMD_MASK)
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#define RAW_HDR_GET_USR(x) ((x)[RAW_HDR_CMD] & RAW_HDR_USR_MASK)
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extern const unsigned char raw_header[RAW_HDR_LEN];
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#ifdef WINDOWS32
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@ -85,6 +90,12 @@ struct query {
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int fromlen;
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};
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enum connection {
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CONN_RAW_UDP,
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CONN_DNS_NULL,
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CONN_MAX
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};
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void check_superuser(void (*usage_fn)(void));
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int open_dns(int, in_addr_t);
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void close_dns(int);
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51
src/iodine.c
51
src/iodine.c
@ -60,6 +60,7 @@ WSADATA wsa_data;
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static void send_ping(int fd);
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static void send_chunk(int fd);
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static void send_raw_data(int fd);
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static int build_hostname(char *buf, size_t buflen,
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const char *data, const size_t datalen,
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const char *topdomain, struct encoder *encoder);
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@ -94,6 +95,9 @@ static struct encoder *b32;
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* Defaults to Base32, can be changed after handshake */
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static struct encoder *dataenc;
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/* My connection mode */
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static enum connection conn;
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#if !defined(BSD) && !defined(__GLIBC__)
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static char *__progname;
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#endif
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@ -120,7 +124,7 @@ send_query(int fd, char *hostname)
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}
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static void
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send_raw(int fd, char *buf, int buflen, int cmd)
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send_raw(int fd, char *buf, int buflen, int user, int cmd)
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{
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char packet[4096];
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int len;
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@ -131,7 +135,7 @@ send_raw(int fd, char *buf, int buflen, int cmd)
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memcpy(&packet[RAW_HDR_LEN], buf, len);
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len += RAW_HDR_LEN;
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packet[RAW_HDR_CMD] = cmd;
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packet[RAW_HDR_CMD] = cmd | (user & 0x0F);
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sendto(fd, packet, len, 0, (struct sockaddr*)&raw_serv, sizeof(raw_serv));
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}
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@ -263,7 +267,11 @@ tunnel_tun(int tun_fd, int dns_fd)
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outpkt.seqno++;
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outpkt.fragment = 0;
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if (conn == CONN_DNS_NULL) {
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send_chunk(dns_fd);
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} else {
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send_raw_data(dns_fd);
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}
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return read;
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}
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@ -327,7 +335,7 @@ tunnel(int tun_fd, int dns_fd)
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FD_ZERO(&fds);
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if (!is_sending()) {
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if ((!is_sending()) || conn == CONN_RAW_UDP) {
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FD_SET(tun_fd, &fds);
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}
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FD_SET(dns_fd, &fds);
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@ -340,7 +348,7 @@ tunnel(int tun_fd, int dns_fd)
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if (i < 0)
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err(1, "select");
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if (i == 0) /* timeout */
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if (i == 0 && conn == CONN_DNS_NULL) /* timeout */
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send_ping(dns_fd);
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else {
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if (FD_ISSET(tun_fd, &fds)) {
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@ -357,6 +365,12 @@ tunnel(int tun_fd, int dns_fd)
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return rv;
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}
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static void
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send_raw_data(int dns_fd)
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{
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send_raw(dns_fd, outpkt.data, outpkt.len, userid, RAW_HDR_CMD_DATA);
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}
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static void
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send_chunk(int fd)
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{
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@ -507,11 +521,10 @@ send_ip_request(int fd, int userid)
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static void
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send_raw_udp_login(int dns_fd, int userid, int seed)
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{
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char buf[17];
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char buf[16];
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login_calculate(buf, 16, password, seed + 1);
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buf[16] = userid;
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send_raw(dns_fd, buf, sizeof(buf), RAW_HDR_CMD_LOGIN);
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send_raw(dns_fd, buf, sizeof(buf), userid, RAW_HDR_CMD_LOGIN);
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}
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static void
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@ -715,7 +728,7 @@ handshake_raw_udp(int dns_fd, int seed)
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if (!remoteaddr) {
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fprintf(stderr, " failed to get IP.\n");
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return 1;
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return 0;
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}
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fprintf(stderr, " at %s: ", inet_ntoa(server));
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fflush(stderr);
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@ -743,16 +756,15 @@ handshake_raw_udp(int dns_fd, int seed)
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if(r > 0) {
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/* recv() needed for windows, dont change to read() */
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len = recv(dns_fd, in, sizeof(in), 0);
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if (len >= (17 + RAW_HDR_LEN)) {
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if (len >= (16 + RAW_HDR_LEN)) {
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char hash[16];
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login_calculate(hash, 16, password, seed - 1);
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if (memcmp(in, raw_header, RAW_HDR_IDENT_LEN) == 0
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&& in[RAW_HDR_CMD] == RAW_HDR_CMD_LOGIN
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&& memcmp(&in[RAW_HDR_LEN], hash, sizeof(hash)) == 0
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&& in[16 + RAW_HDR_LEN] == userid) {
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&& RAW_HDR_GET_CMD(in) == RAW_HDR_CMD_LOGIN
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&& memcmp(&in[RAW_HDR_LEN], hash, sizeof(hash)) == 0) {
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fprintf(stderr, "OK\n");
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return 0;
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return 1;
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}
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}
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}
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@ -761,7 +773,7 @@ handshake_raw_udp(int dns_fd, int seed)
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}
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fprintf(stderr, "failed\n");
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return 1;
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return 0;
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}
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static int
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@ -1016,8 +1028,9 @@ handshake(int dns_fd, int autodetect_frag_size, int fragsize)
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return r;
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}
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handshake_raw_udp(dns_fd, seed);
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if (handshake_raw_udp(dns_fd, seed)) {
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conn = CONN_RAW_UDP;
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} else {
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case_preserved = handshake_case_check(dns_fd);
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if (case_preserved) {
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@ -1032,6 +1045,7 @@ handshake(int dns_fd, int autodetect_frag_size, int fragsize)
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}
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handshake_set_fragsize(dns_fd, fragsize);
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}
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return 0;
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}
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@ -1178,6 +1192,7 @@ main(int argc, char **argv)
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b32 = get_base32_encoder();
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dataenc = get_base32_encoder();
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conn = CONN_DNS_NULL;
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retval = 0;
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@ -1312,7 +1327,11 @@ main(int argc, char **argv)
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goto cleanup2;
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}
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if (conn == CONN_DNS_NULL) {
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fprintf(stderr, "Sending queries for %s to %s\n", topdomain, nameserv_addr);
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} else {
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fprintf(stderr, "Sending raw traffic directly to %s\n", inet_ntoa(raw_serv.sin_addr));
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}
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if (foreground == 0)
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do_detach();
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145
src/iodined.c
145
src/iodined.c
@ -85,8 +85,9 @@ static int debug;
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static char *__progname;
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#endif
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static int read_dns(int, struct query *);
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static int read_dns(int, int, struct query *);
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static void write_dns(int, struct query *, char *, int);
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static void handle_full_packet(int, int);
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static void
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sigint(int sig)
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@ -295,15 +296,12 @@ static void
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handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
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{
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struct in_addr tempip;
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struct ip *hdr;
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unsigned long outlen;
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char in[512];
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char logindata[16];
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char out[64*1024];
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char unpacked[64*1024];
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char *tmp[2];
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int userid;
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int touser;
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int version;
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int code;
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int read;
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@ -589,30 +587,7 @@ handle_null_request(int tun_fd, int dns_fd, struct query *q, int domain_len)
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}
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if (lastfrag & 1) { /* packet is complete */
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int ret;
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outlen = sizeof(out);
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ret = uncompress((uint8_t*)out, &outlen,
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(uint8_t*)users[userid].inpacket.data, users[userid].inpacket.len);
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if (ret == Z_OK) {
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hdr = (struct ip*) (out + 4);
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touser = find_user_by_ip(hdr->ip_dst.s_addr);
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if (touser == -1) {
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/* send the uncompressed packet to tun device */
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write_tun(tun_fd, out, outlen);
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} else {
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/* send the compressed packet to other client
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* if another packet is queued, throw away this one. TODO build queue */
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if (users[touser].outpacket.len == 0) {
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memcpy(users[touser].outpacket.data, users[userid].inpacket.data, users[userid].inpacket.len);
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users[touser].outpacket.len = users[userid].inpacket.len;
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}
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}
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} else {
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fprintf(stderr, "Discarded data, uncompress() result: %d\n", ret);
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}
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users[userid].inpacket.len = users[userid].inpacket.offset = 0;
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handle_full_packet(tun_fd, userid);
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}
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/* Update seqno and maybe send immediate response packet */
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update_downstream_seqno(dns_fd, userid, dn_seq, dn_frag);
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@ -730,7 +705,7 @@ tunnel_dns(int tun_fd, int dns_fd, int bind_fd)
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int domain_len;
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int inside_topdomain;
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if ((read = read_dns(dns_fd, &q)) <= 0)
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if ((read = read_dns(dns_fd, tun_fd, &q)) <= 0)
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return 0;
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if (debug >= 2) {
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@ -839,7 +814,42 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
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}
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static void
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send_raw(int fd, char *buf, int buflen, int cmd, struct query *q)
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handle_full_packet(int tun_fd, int userid)
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{
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unsigned long outlen;
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char out[64*1024];
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int touser;
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int ret;
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outlen = sizeof(out);
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ret = uncompress((uint8_t*)out, &outlen,
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(uint8_t*)users[userid].inpacket.data, users[userid].inpacket.len);
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if (ret == Z_OK) {
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struct ip *hdr;
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hdr = (struct ip*) (out + 4);
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touser = find_user_by_ip(hdr->ip_dst.s_addr);
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if (touser == -1) {
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/* send the uncompressed packet to tun device */
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write_tun(tun_fd, out, outlen);
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} else {
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/* send the compressed packet to other client
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* if another packet is queued, throw away this one. TODO build queue */
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if (users[touser].outpacket.len == 0) {
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memcpy(users[touser].outpacket.data, users[userid].inpacket.data, users[userid].inpacket.len);
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users[touser].outpacket.len = users[userid].inpacket.len;
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}
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}
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} else {
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fprintf(stderr, "Discarded data, uncompress() result: %d\n", ret);
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}
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users[userid].inpacket.len = users[userid].inpacket.offset = 0;
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}
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static void
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send_raw(int fd, char *buf, int buflen, int user, int cmd, struct query *q)
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{
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char packet[4096];
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int len;
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@ -850,51 +860,96 @@ send_raw(int fd, char *buf, int buflen, int cmd, struct query *q)
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memcpy(&packet[RAW_HDR_LEN], buf, len);
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len += RAW_HDR_LEN;
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packet[RAW_HDR_CMD] = cmd;
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packet[RAW_HDR_CMD] = cmd | (user & 0x0F);
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sendto(fd, packet, len, 0, &q->from, q->fromlen);
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}
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static void
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handle_raw_login(char *packet, int len, struct query *q, int fd)
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handle_raw_login(char *packet, int len, struct query *q, int fd, int userid)
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{
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int userid;
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char myhash[16];
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if (len < 17) return;
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if (len < 16) return;
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userid = packet[16];
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if (userid < 0 || userid > created_users) return;
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if (!users[userid].active) return;
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/* User sends hash of seed + 1 */
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login_calculate(myhash, 16, password, users[userid].seed + 1);
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if (memcmp(packet, myhash, 16) == 0) {
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struct sockaddr_in *tempin;
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/* Update query and time info for user */
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users[userid].last_pkt = time(NULL);
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memcpy(&(users[userid].q), q, sizeof(struct query));
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/* Store remote IP number */
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tempin = (struct sockaddr_in *) &(q->from);
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memcpy(&(users[userid].host), &(tempin->sin_addr), sizeof(struct in_addr));
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/* Correct hash, reply with hash of seed - 1 */
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user_set_conn_type(userid, CONN_RAW_UDP);
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users[userid].last_pkt = time(NULL);
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login_calculate(myhash, 16, password, users[userid].seed - 1);
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memcpy(packet, myhash, 16);
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send_raw(fd, packet, 17, RAW_HDR_CMD_LOGIN, q);
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send_raw(fd, myhash, 16, userid, RAW_HDR_CMD_LOGIN, q);
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}
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}
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static int
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raw_decode(char *packet, int len, struct query *q, int fd)
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static void
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handle_raw_data(char *packet, int len, struct query *q, int dns_fd, int tun_fd, int userid)
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{
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if (check_user_and_ip(userid, q) != 0) {
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return;
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}
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/* Update query and time info for user */
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users[userid].last_pkt = time(NULL);
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memcpy(&(users[userid].q), q, sizeof(struct query));
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/* copy to packet buffer, update length */
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users[userid].inpacket.offset = 0;
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memcpy(users[userid].inpacket.data, packet, len);
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users[userid].inpacket.len = len;
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if (debug >= 1) {
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fprintf(stderr, "IN pkt raw, total %d, from user %d\n",
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users[userid].inpacket.len, userid);
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}
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handle_full_packet(tun_fd, userid);
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}
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static int
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raw_decode(char *packet, int len, struct query *q, int dns_fd, int tun_fd)
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{
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int raw_user;
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/* minimum length */
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if (len < RAW_HDR_LEN) return 0;
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/* should start with header */
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if (memcmp(packet, raw_header, RAW_HDR_IDENT_LEN)) return 0;
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if (packet[RAW_HDR_CMD] == RAW_HDR_CMD_LOGIN) {
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handle_raw_login(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, fd);
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} else {
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warnx("Unhandled raw command %02X\n", packet[RAW_HDR_CMD]);
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raw_user = RAW_HDR_GET_USR(packet);
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printf("raw %02x\n", packet[RAW_HDR_CMD]);
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switch (RAW_HDR_GET_CMD(packet)) {
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case RAW_HDR_CMD_LOGIN:
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/* Login challenge */
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handle_raw_login(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, dns_fd, raw_user);
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break;
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case RAW_HDR_CMD_DATA:
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/* Data packet */
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handle_raw_data(&packet[RAW_HDR_LEN], len - RAW_HDR_LEN, q, dns_fd, tun_fd, raw_user);
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break;
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default:
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warnx("Unhandled raw command %02X from user %d", RAW_HDR_GET_CMD(packet), raw_user);
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break;
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}
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return 1;
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}
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static int
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read_dns(int fd, struct query *q)
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read_dns(int fd, int tun_fd, struct query *q) /* FIXME: tun_fd is because of raw_decode() below */
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{
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struct sockaddr_in from;
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socklen_t addrlen;
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@ -929,7 +984,7 @@ read_dns(int fd, struct query *q)
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q->fromlen = addrlen;
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/* TODO do not handle raw packets here! */
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if (raw_decode(packet, r, q, fd)) {
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if (raw_decode(packet, r, q, fd, tun_fd)) {
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return 0;
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}
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if (dns_decode(NULL, 0, q, QR_QUERY, packet, r) < 0) {
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16
src/user.c
16
src/user.c
@ -90,6 +90,7 @@ init_users(in_addr_t my_ip, int netbits)
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users[i].out_acked_seqno = 0;
|
||||
users[i].out_acked_fragment = 0;
|
||||
users[i].fragsize = 4096;
|
||||
users[i].conn = CONN_DNS_NULL;
|
||||
}
|
||||
|
||||
return created_users;
|
||||
@ -161,6 +162,8 @@ find_available_user()
|
||||
if ((!users[i].active || users[i].last_pkt + 60 < time(NULL)) && !users[i].disabled) {
|
||||
users[i].active = 1;
|
||||
users[i].last_pkt = time(NULL);
|
||||
users[i].fragsize = 4096;
|
||||
users[i].conn = CONN_DNS_NULL;
|
||||
ret = i;
|
||||
break;
|
||||
}
|
||||
@ -176,3 +179,16 @@ user_switch_codec(int userid, struct encoder *enc)
|
||||
|
||||
users[userid].encoder = enc;
|
||||
}
|
||||
|
||||
void
|
||||
user_set_conn_type(int userid, enum connection c)
|
||||
{
|
||||
if (userid < 0 || userid >= USERS)
|
||||
return;
|
||||
|
||||
if (c < 0 || c >= CONN_MAX)
|
||||
return;
|
||||
|
||||
users[userid].conn = c;
|
||||
}
|
||||
|
||||
|
||||
@ -34,6 +34,7 @@ struct user {
|
||||
int out_acked_seqno;
|
||||
int out_acked_fragment;
|
||||
int fragsize;
|
||||
enum connection conn;
|
||||
};
|
||||
|
||||
extern struct user users[USERS];
|
||||
@ -44,5 +45,6 @@ int find_user_by_ip(uint32_t);
|
||||
int all_users_waiting_to_send();
|
||||
int find_available_user();
|
||||
void user_switch_codec(int userid, struct encoder *enc);
|
||||
void user_set_conn_type(int userid, enum connection c);
|
||||
|
||||
#endif
|
||||
|
||||
Loading…
Reference in New Issue
Block a user