A little bit of refactoring - separated iodined.c into separate files

Fixed up client side compile issues
Removed old packet handling code - TODO: use sliding window buffer
instead

src/Makefile

@@ -1,7 +1,7 @@
 COMMONOBJS = tun.o dns.o read.o encoding.o login.o base32.o base64.o base64u.o base128.o md5.o window.o common.o
 CLIENTOBJS = iodine.o client.o util.o
 CLIENT = ../bin/iodine
-SERVEROBJS = iodined.o user.o fw_query.o
+SERVEROBJS = iodined.o user.o fw_query.o server.o
 SERVER = ../bin/iodined
 
 OS = `echo $(TARGETOS) | tr "a-z" "A-Z"`

src/client.c

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
- * 2006-2009 Bjorn Andersson <flex@kryo.se>
+ * 2006-2009 Bjorn Andersson <flex@kryo.se>,
+ * 2015 Frekk van Blagh <frekk@frekkworks.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -132,7 +133,7 @@ client_init()
 	// TODO: user-set window size (command line option)
 	outbuf = window_buffer_init(100, 10, hostname_maxlen, WINDOW_SENDING);
 	/* Incoming buffer max fragsize doesn't matter */
-	inbuf = window_buffer_init(100, 10, 1200, WINDOW_RECVING);
+	inbuf = window_buffer_init(128, 10, MAX_FRAGSIZE, WINDOW_RECVING);
 
 	next_downstream_ack = -1;
 	current_nameserver = 0;
@@ -362,13 +363,33 @@ is_sending()
 	return (outbuf->numitems > 0);
 }
 
+static void
+send_ping(int fd, int ping_response) // TODO: setup window sync stuff in ping
+{
+	if (conn == CONN_DNS_NULL) {
+		char data[4];
+
+		data[0] = userid;
+		data[1] = inbuf->start_seq_id & 0xff;
+		data[2] = outbuf->start_seq_id & 0xff;
+		data[3] = outbuf->windowsize & 0xff;
+		data[4] = inbuf->windowsize & 0xff;
+		data[5] = ping_response & 1;
+		data[6] = (rand_seed >> 8) & 0xff;
+		data[7] = (rand_seed >> 0) & 0xff;
+		rand_seed++;
+
+		send_packet(fd, 'p', data, sizeof(data));
+	} else {
+		send_raw(fd, NULL, 0, userid, RAW_HDR_CMD_PING);
+	}
+}
 
 static void
 send_next_frag(int fd)
 /* Sends next available fragment of data from the outgoing window buffer */
 {
 	static uint8_t buf[MAX_FRAGSIZE];
-	size_t len;
 	int code;
 	static int datacmc = 0;
 	static char *datacmcchars = "abcdefghijklmnopqrstuvwxyz0123456789";
@@ -381,13 +402,13 @@ send_next_frag(int fd)
 		if (is_sending()) {
 			/* There is stuff to send but we're out of sync, so send a ping
 			 * to get things back in order and keep the packets flowing */
-			send_ping(fd);
+			send_ping(fd, 1);
 		}
 		return; /* nothing to send - why was this called? */
 	}
 
 	/* Note: must be same, or smaller than send_fragsize_probe() */
-	len = build_hostname(buf, sizeof(buf), f->data, f->len, topdomain, dataenc, hostname_maxlen);
+	build_hostname((char *)buf, sizeof(buf), (char *)f->data, f->len, topdomain, dataenc, hostname_maxlen);
 
 	/* Build upstream data header (see doc/proto_xxxxxxxx.txt) */
 
@@ -411,29 +432,7 @@ send_next_frag(int fd)
 	if (datacmc >= 36)
 		datacmc = 0;
 
-	send_query(fd, buf);
+	send_query(fd, (char *)buf);
-}
-
-static void
-send_ping(int fd, int ping_response) // TODO: setup window sync stuff in ping
-{
-	if (conn == CONN_DNS_NULL) {
-		char data[4];
-
-		data[0] = userid;
-		data[1] = inbuf->start_seq_id & 0xff;
-		data[2] = outbuf->start_seq_id & 0xff;
-		data[3] = outbuf->windowsize & 0xff;
-		data[4] = inbuf->windowsize & 0xff;
-		data[5] = ping_response & 1;
-		data[6] = (rand_seed >> 8) & 0xff;
-		data[7] = (rand_seed >> 0) & 0xff;
-		rand_seed++;
-
-		send_packet(fd, 'p', data, sizeof(data));
-	} else {
-		send_raw(fd, NULL, 0, userid, RAW_HDR_CMD_PING);
-	}
 }
 
 static void
@@ -574,7 +573,7 @@ dns_namedec(char *outdata, int outdatalen, char *buf, int buflen)
 }
 
 static int
-read_dns_withq(int dns_fd, int tun_fd, uint8_t *buf, int buflen, struct query *q)
+read_dns_withq(int dns_fd, int tun_fd, char *buf, int buflen, struct query *q)
 /* Returns -1 on receive error or decode error, including DNS error replies.
    Returns 0 on replies that could be correct but are useless, and are not
    DNS error replies.
@@ -671,7 +670,7 @@ read_dns_withq(int dns_fd, int tun_fd, uint8_t *buf, int buflen, struct query *q
 		r -= RAW_HDR_LEN;
 		datalen = sizeof(buf);
 		if (uncompress((uint8_t*)buf, &datalen, (uint8_t*) &data[RAW_HDR_LEN], r) == Z_OK) {
-			write_tun(tun_fd, buf, datalen);
+			write_tun(tun_fd, (uint8_t*)buf, datalen);
 		}
 
 		/* don't process any further */
@@ -766,6 +765,8 @@ static int
 parse_data(uint8_t *data, size_t len, fragment *f)
 {
 	memset(f, 0, sizeof(fragment));
+	int ping = (data[3] >> 5) & 1;
+	if (!ping) {
 		f->seqID = data[0];
 		f->start = data[3] & 1;
 		f->end = (data[3] >> 1) & 1;
@@ -774,7 +775,17 @@ parse_data(uint8_t *data, size_t len, fragment *f)
 		f->compressed = (data[3] >> 4) & 1;
 		f->len = len - 3;
 		memcpy(f->data, data + 3, MIN(f->len, sizeof(f->data)));
-	return (data[3] >> 5) & 1; /* return ping flag (if corresponding query was a ping) */
+	} else { /* Handle ping stuff */
+		if (len != 5) return 1; /* invalid packet - continue */
+		static unsigned in_start_seq, out_start_seq, in_wsize, out_wsize;
+		out_start_seq = data[0];
+		in_start_seq = data[1];
+		in_wsize = data[3];
+		out_wsize = data[4];
+		warnx("Pingy thingy received.");
+		// TODO: handle pings
+	}
+	return ping; /* return ping flag (if corresponding query was a ping) */
 }
 
 static int
@@ -825,7 +836,7 @@ tunnel_dns(int tun_fd, int dns_fd)
 	memset(&q, 0, sizeof(q));
 	memset(buf, 0, sizeof(buf));
 	memset(cbuf, 0, sizeof(cbuf));
-	read = read_dns_withq(dns_fd, tun_fd, cbuf, sizeof(cbuf), &q);
+	read = read_dns_withq(dns_fd, tun_fd, (char *)cbuf, sizeof(cbuf), &q);
 
 	if (conn != CONN_DNS_NULL)
 		return 1;  /* everything already done */
@@ -895,9 +906,9 @@ tunnel_dns(int tun_fd, int dns_fd)
 	/* Decode the downstream data header and fragment-ify ready for processing */
 	res = parse_data(cbuf, read, &f);
 
-	/* if this response was a reverse ping/response to a ping: do something different? */
+	/* if this response was a reverse ping/response to a ping, we need to do something */
 	if (res) {
-		// TODO: handle pings to resync window
+		goto skip_recv;
 	}
 
 	window_ack(outbuf, f.ack_other);
@@ -954,6 +965,7 @@ tunnel_dns(int tun_fd, int dns_fd)
 		send_something_now = 1;
 	}
 
+	skip_recv:
 	/* Move window along after doing all data processing */
 	window_tick(inbuf);
 
@@ -968,7 +980,7 @@ tunnel_dns(int tun_fd, int dns_fd)
 
 	/* Send ping if we didn't send anything yet */
 	if (send_something_now) {
-		send_ping(dns_fd);
+		send_ping(dns_fd, 0);
 		send_ping_soon = 0;
 	}
 
@@ -1031,10 +1043,10 @@ client_tunnel(int tun_fd, int dns_fd)
 					send_next_frag(dns_fd);
 				} else {
 					outbuf->resends = 0;
-					send_ping(dns_fd);
+					send_ping(dns_fd, 1);
 				}
 			} else {
-				send_ping(dns_fd);
+				send_ping(dns_fd, 0);
 			}
 			send_ping_soon = 0;
 
@@ -2324,7 +2336,7 @@ client_handshake(int dns_fd, int raw_mode, int autodetect_frag_size, int fragsiz
 			fragsize = handshake_autoprobe_fragsize(dns_fd);
 			if (fragsize > MAX_FRAGSIZE) {
 				/* This is very unlikely except perhaps over LAN */
-				fprintf(stderr, "Can transfer fragsize of %d, however iodine has been compiled with MAX_FRAGSIZE = %d. To fully utilize this connection, please recompile iodine/iodined.");
+				fprintf(stderr, "Can transfer fragsize of %d, however iodine has been compiled with MAX_FRAGSIZE = %d. To fully utilize this connection, please recompile iodine/iodined.", fragsize, MAX_FRAGSIZE);
 				fragsize = MAX_FRAGSIZE;
 			}
 			if (!fragsize) {

src/encoding.c

@@ -22,13 +22,13 @@
 int
 build_hostname(char *buf, size_t buflen,
 		const char *data, const size_t datalen,
-		const char *topdomain, struct encoder *encoder, int maxlen)
+		const char *topdomain, struct encoder *encoder, size_t maxlen)
 {
 	size_t space;
 	char *b;
 
-	space = MIN((size_t)maxlen, buflen) - strlen(topdomain) - 8;
+	space = MIN(maxlen, buflen) - strlen(topdomain) - DOWNSTREAM_HDR + 3;
-	/* 8 = 5 max header length + 1 dot before topdomain + 2 safety */
+	/* max header length + 1 dot before topdomain + 2 safety */
 
 	if (!encoder->places_dots())
 		space -= (space / 57); /* space for dots */

src/encoding.h

@@ -35,7 +35,7 @@ struct encoder {
 	int (*blocksize_encoded)(void);
 };
 
-int build_hostname(char *, size_t, const char *, const size_t, const char *, struct encoder *, int);
+int build_hostname(char *, size_t, const char *, const size_t, const char *, struct encoder *, size_t);
 int unpack_data(char *, size_t, char *, size_t, struct encoder *);
 int inline_dotify(char *, size_t);
 int inline_undotify(char *, size_t);

src/server.h

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2006-2015 Erik Ekman <yarrick@kryo.se>,
+ * 2006-2009 Bjorn Andersson <flex@kryo.se>,
+ * 2015 Frekk van Blagh <frekk@frekkworks.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef __SERVER_H__
+#define __SERVER_H__
+
+#ifdef WINDOWS32
+#include "windows.h"
+#include <winsock2.h>
+#else
+#include <arpa/nameser.h>
+#ifdef DARWIN
+#define BIND_8_COMPAT
+#include <arpa/nameser_compat.h>
+#endif
+#define _XPG4_2
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <grp.h>
+#include <sys/uio.h>
+#include <pwd.h>
+#include <netdb.h>
+#include <syslog.h>
+#endif
+
+#define DNSCACHE_LEN 10
+/* Undefine to disable. Should be less than 18; also see comments in iodined.c */
+
+#define QMEMPING_LEN 30
+/* Max advisable: 64k/2 = 32000. Total mem usage: QMEMPING_LEN * USERS * 6 bytes */
+
+#define QMEMDATA_LEN 15
+/* Max advisable: 36/2 = 18. Total mem usage: QMEMDATA_LEN * USERS * 6 bytes */
+
+#define PASSWORD_ENV_VAR "IODINED_PASS"
+
+#if defined IP_RECVDSTADDR
+# define DSTADDR_SOCKOPT IP_RECVDSTADDR
+# define dstaddr(x) ((struct in_addr *) CMSG_DATA(x))
+#elif defined IP_PKTINFO
+# define DSTADDR_SOCKOPT IP_PKTINFO
+# define dstaddr(x) (&(((struct in_pktinfo *)(CMSG_DATA(x)))->ipi_addr))
+#endif
+
+#ifndef IPV6_RECVPKTINFO
+#define IPV6_RECVPKTINFO IPV6_PKTINFO
+#endif
+
+#if !defined(BSD) && !defined(__GLIBC__)
+static char *__progname;
+#endif
+
+/* Struct with IPv4 and IPv6 file descriptors.
+ * Need to be passed on down to tunneling code since we can get a
+ * packet on one fd meant for a user on the other.
+ */
+struct dnsfd {
+	int v4fd;
+	int v6fd;
+};
+
+typedef enum {
+	VERSION_ACK,
+	VERSION_NACK,
+	VERSION_FULL
+} version_ack_t;
+
+extern char *topdomain;
+extern char password[33];
+extern struct encoder *b32;
+extern struct encoder *b64;
+extern struct encoder *b64u;
+extern struct encoder *b128;
+
+extern int check_ip;
+extern int my_mtu;
+extern in_addr_t my_ip;
+extern int netmask;
+
+extern in_addr_t ns_ip;
+
+extern int bind_port;
+extern int debug;
+
+void server_init();
+void server_stop();
+int server_tunnel(int tun_fd, struct dnsfd *dns_fds, int bind_fd, int max_idle_time);
+
+int read_dns(int fd, struct dnsfd *dns_fds, int tun_fd, struct query *q);
+void write_dns(int fd, struct query *q, char *data, int datalen, char downenc);
+void handle_full_packet(int tun_fd, struct dnsfd *dns_fds, int userid, uint8_t *data, size_t len);
+void handle_null_request(int tun_fd, int dns_fd, struct dnsfd *dns_fds, struct query *q, int domain_len);
+void handle_ns_request(int dns_fd, struct query *q);
+void handle_a_request(int dns_fd, struct query *q, int fakeip);
+
+#endif /* __SERVER_H__ */

src/tun.c

@@ -504,7 +504,7 @@ read_tun(int tun_fd, char *buf, size_t len)
 }
 #else
 int
-write_tun(int tun_fd, char *data, size_t len)
+write_tun(int tun_fd, uint8_t *data, size_t len)
 {
 #if defined (FREEBSD) || defined (NETBSD)
 	/* FreeBSD/NetBSD has no header */
@@ -545,7 +545,7 @@ write_tun(int tun_fd, char *data, size_t len)
 }
 
 ssize_t
-read_tun(int tun_fd, char *buf, size_t len)
+read_tun(int tun_fd, uint8_t *buf, size_t len)
 {
 #if defined (FREEBSD) || defined (NETBSD)
 	/* FreeBSD/NetBSD has no header */

src/tun.h

@@ -20,8 +20,8 @@
 
 int open_tun(const char *);
 void close_tun(int);
-int write_tun(int, char *, size_t);
+int write_tun(int, uint8_t *, size_t);
-ssize_t read_tun(int, char *, size_t);
+ssize_t read_tun(int, uint8_t *, size_t);
 int tun_setip(const char *, const char *, int);
 int tun_setmtu(const unsigned);
 

src/user.c

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
- * 2006-2009 Bjorn Andersson <flex@kryo.se>
+ * 2006-2009 Bjorn Andersson <flex@kryo.se>,
+ * 2015 Frekk van Blagh <frekk@frekkworks.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -33,9 +34,12 @@
 #include "common.h"
 #include "encoding.h"
 #include "user.h"
+#include "window.h"
 
 struct tun_user *users;
 unsigned usercount;
+int created_users;
+
 
 int
 init_users(in_addr_t my_ip, int netbits)
@@ -60,6 +64,7 @@ init_users(in_addr_t my_ip, int netbits)
 	maxusers = (1 << (32-netbits)) - 3; /* 3: Net addr, broadcast addr, iodined addr */
 	usercount = MIN(maxusers, USERS);
 
+	if (users) free(users);
 	users = calloc(usercount, sizeof(struct tun_user));
 	for (i = 0; i < usercount; i++) {
 		in_addr_t ip;
@@ -74,11 +79,7 @@ init_users(in_addr_t my_ip, int netbits)
 		}
 		users[i].tun_ip = ip;
 		net.s_addr = ip;
-		users[i].disabled = 0;
+ 		/* Rest is reset on login ('V' packet) or already 0 */
-		users[i].authenticated = 0;
-		users[i].authenticated_raw = 0;
-		users[i].active = 0;
- 		/* Rest is reset on login ('V' packet) */
 	}
 
 	return usercount;
@@ -95,75 +96,55 @@ users_get_first_ip()
 int
 find_user_by_ip(uint32_t ip)
 {
-	int ret;
+	for (int i = 0; i < usercount; i++) {
-	int i;
+		if (user_active(i) && users[i].authenticated && ip == users[i].tun_ip) {
+			return i;
+		}
+	}
+	return -1;
+}
 
-	ret = -1;
+int
-	for (i = 0; i < usercount; i++) {
+user_sending(int user)
-		if (users[i].active &&
+{
-			users[i].authenticated &&
+	return users[user].outgoing->numitems > 0;
-			!users[i].disabled &&
+}
-			users[i].last_pkt + 60 > time(NULL) &&
+
-			ip == users[i].tun_ip) {
+int
-			ret = i;
+user_active(int i)
-			break;
+{
-		}
+	return users[i].active && !users[i].disabled && users[i].last_pkt + 60 > time(NULL);
-	}
-	return ret;
 }
 
 int
 all_users_waiting_to_send()
 /* If this returns true, then reading from tun device is blocked.
-   So only return true when all clients have at least one packet in
+   So only return true when all clients have at least one fragment in
-   the outpacket-queue, so that sending back-to-back is possible
+   the outgoing buffer, so that sending back-to-back is possible
    without going through another select loop.
 */
 {
-	time_t now;
+	for (int i = 0; i < usercount; i++)
-	int ret;
+		if (!(user_active(i) && user_sending(i))) return 0;
-	int i;
+	return 1;
-
-	ret = 1;
-	now = time(NULL);
-	for (i = 0; i < usercount; i++) {
-		if (users[i].active && !users[i].disabled &&
-			users[i].last_pkt + 60 > now &&
-			((users[i].conn == CONN_RAW_UDP) ||
-			((users[i].conn == CONN_DNS_NULL)
-#ifdef OUTPACKETQ_LEN
-				&& users[i].outpacketq_filled < 1
-#else
-				&& users[i].outpacket.len == 0
-#endif
-			))) {
-
-			ret = 0;
-			break;
-		}
-	}
-	return ret;
 }
 
 int
 find_available_user()
 {
-	int ret = -1;
+	for (int u = 0; u < usercount; u++) {
-	int i;
-	for (i = 0; i < usercount; i++) {
 		/* Not used at all or not used in one minute */
-		if ((!users[i].active || users[i].last_pkt + 60 < time(NULL)) && !users[i].disabled) {
+		if (!user_active(u)) {
-			users[i].active = 1;
+			/* reset all stats */
-			users[i].authenticated = 0;
+			memset(&users[u], 0, sizeof(users[u]));
-			users[i].authenticated_raw = 0;
+			users[u].active = 1;
-			users[i].last_pkt = time(NULL);
+			users[u].last_pkt = time(NULL);
-			users[i].fragsize = 4096;
+			users[u].fragsize = MAX_FRAGSIZE;
-			users[i].conn = CONN_DNS_NULL;
+			users[u].conn = CONN_DNS_NULL;
-			ret = i;
+			return u;
-			break;
 		}
 	}
-	return ret;
+	return -1;
 }
 
 void
@@ -187,3 +168,60 @@ user_set_conn_type(int userid, enum connection c)
 	users[userid].conn = c;
 }
 
+/* This will not check that user has passed login challenge */
+int
+check_user_and_ip(int userid, struct query *q)
+{
+	/* Note: duplicate in handle_raw_login() except IP-address check */
+
+	if (userid < 0 || userid >= created_users ) {
+		return 1;
+	}
+	if (!users[userid].active || users[userid].disabled) {
+		return 1;
+	}
+	if (users[userid].last_pkt + 60 < time(NULL)) {
+		return 1;
+	}
+
+	/* return early if IP checking is disabled */
+	if (!check_ip) {
+		return 0;
+	}
+
+	if (q->from.ss_family != users[userid].host.ss_family) {
+		return 1;
+	}
+	/* Check IPv4 */
+	if (q->from.ss_family == AF_INET) {
+		struct sockaddr_in *expected, *received;
+
+		expected = (struct sockaddr_in *) &(users[userid].host);
+		received = (struct sockaddr_in *) &(q->from);
+		return memcmp(&(expected->sin_addr), &(received->sin_addr), sizeof(struct in_addr));
+	}
+	/* Check IPv6 */
+	if (q->from.ss_family == AF_INET6) {
+		struct sockaddr_in6 *expected, *received;
+
+		expected = (struct sockaddr_in6 *) &(users[userid].host);
+		received = (struct sockaddr_in6 *) &(q->from);
+		return memcmp(&(expected->sin6_addr), &(received->sin6_addr), sizeof(struct in6_addr));
+	}
+	/* Unknown address family */
+	return 1;
+}
+
+/* This checks that user has passed normal (non-raw) login challenge */
+int
+check_authenticated_user_and_ip(int userid, struct query *q)
+{
+	int res = check_user_and_ip(userid, q);
+	if (res)
+		return res;
+
+	if (!users[userid].authenticated)
+		return 1;
+
+	return 0;
+}

src/user.h

@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
- * 2006-2009 Bjorn Andersson <flex@kryo.se>
+ * 2006-2009 Bjorn Andersson <flex@kryo.se>,
+ * 2015 Frekk van Blagh <frekk@frekkworks.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -18,22 +19,11 @@
 #ifndef __USER_H__
 #define __USER_H__
 
+#include "window.h"
+#include "server.h"
+
 #define USERS 16
 
-#define OUTPACKETQ_LEN 4		/* Note: 16 users * 1 packet = 1MB */
-/* Undefine to have no queue for packets coming in from tun device, which may
-   lead to massive dropping in multi-user situations with high traffic. */
-
-#define DNSCACHE_LEN 4
-/* Undefine to disable. Should be less than 18; also see comments in iodined.c */
-
-
-#define QMEMPING_LEN 30
-/* Max advisable: 64k/2 = 32000. Total mem usage: QMEMPING_LEN * USERS * 6 bytes */
-
-#define QMEMDATA_LEN 15
-/* Max advisable: 36/2 = 18. Total mem usage: QMEMDATA_LEN * USERS * 6 bytes */
-
 struct tun_user {
 	char id;
 	int active;
@@ -48,13 +38,11 @@ struct tun_user {
 	struct query q;
 	struct query q_sendrealsoon;
 	int q_sendrealsoon_new;
-	struct packet inpacket;
+	struct frag_buffer *incoming;
-	struct packet outpacket;
+	struct frag_buffer *outgoing;
-	int outfragresent;
+	int next_upstream_ack;
 	struct encoder *encoder;
 	char downenc;
-	int out_acked_seqno;
-	int out_acked_fragment;
 	int fragsize;
 	enum connection conn;
 	int lazy;
@@ -64,11 +52,6 @@ struct tun_user {
 	unsigned char qmemdata_cmc[QMEMDATA_LEN * 4];
 	unsigned short qmemdata_type[QMEMDATA_LEN];
 	int qmemdata_lastfilled;
-#ifdef OUTPACKETQ_LEN
-	struct packet outpacketq[OUTPACKETQ_LEN];
-	int outpacketq_nexttouse;
-	int outpacketq_filled;
-#endif
 #ifdef DNSCACHE_LEN
 	struct query dnscache_q[DNSCACHE_LEN];
 	char dnscache_answer[DNSCACHE_LEN][4096];
@@ -78,11 +61,17 @@ struct tun_user {
 };
 
 extern struct tun_user *users;
+extern int created_users;
+
+int user_sending(int user);
+int all_users_waiting_to_send();
+int user_active(int i);
+int check_authenticated_user_and_ip(int userid, struct query *q);
+int check_user_and_ip(int userid, struct query *q);
 
 int init_users(in_addr_t, int);
 const char* users_get_first_ip();
 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);

src/window.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 Frekk van Blagh
+ * Copyright (c) 2015 Frekk van Blagh <frekk@frekkworks.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above

src/window.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 Frekk van Blagh
+ * Copyright (c) 2015 Frekk van Blagh <frekk@frekkworks.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -18,7 +18,7 @@
 #define __WINDOW_H__
 
 #define MAX_SEQ_ID 256
-#define MAX_FRAGSIZE 2048
+#define MAX_FRAGSIZE 4096
 #define ACK_TIMEOUT 5
 
 #define WINDOW_SENDING 1
@@ -95,7 +95,7 @@ fragment *window_get_next_sending_fragment(struct frag_buffer *w, int other_ack)
 int window_get_next_ack(struct frag_buffer *w);
 
 /* Sets the fragment with seqid to be ACK'd (SEND) */
-void window_ack(struct frag_buffer *w, unsigned seqid);
+void window_ack(struct frag_buffer *w, int seqid);
 
 /* To be called after all other processing has been done
  * when anything happens (moves window etc) (SEND/RECV) */