X-Git-Url: https://git.toastfreeware.priv.at/debian/iodine.git/blobdiff_plain/fd46ed085eb846701d0f8511de424e8f41cba64b..1dd2f00fccaf11ffc8ccb22d0d8732a759fbfd2e:/src/user.c?ds=sidebyside

diff --git a/src/user.c b/src/user.c
index ed809b8..0dc95db 100644
--- a/src/user.c
+++ b/src/user.c
@@ -1,5 +1,6 @@
 /*
- * Copyright (c) 2006-2007 Bjorn Andersson <flex@kryo.se>, Erik Ekman <yarrick@kryo.se>
+ * Copyright (c) 2006-2014 Erik Ekman <yarrick@kryo.se>,
+ * 2006-2009 Bjorn Andersson <flex@kryo.se>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -14,35 +15,81 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <string.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <time.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <arpa/inet.h>
-#include <netinet/in.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#ifdef WINDOWS32
+#include <winsock2.h>
+#else
+#include <netdb.h>
+#endif
 
 #include "common.h"
+#include "encoding.h"
 #include "user.h"
 
-struct user users[USERS];
+struct tun_user *users;
+unsigned usercount;
 
-void
-init_users(in_addr_t my_ip)
+int
+init_users(in_addr_t my_ip, int netbits)
 {
 	int i;
+	int skip = 0;
 	char newip[16];
-	
-	memset(users, 0, USERS * sizeof(struct user));
-	for (i = 0; i < USERS; i++) {
+
+	int maxusers;
+
+	in_addr_t netmask = 0;
+	struct in_addr net;
+	struct in_addr ipstart;
+
+	for (i = 0; i < netbits; i++) {
+		netmask = (netmask << 1) | 1;
+	}
+	netmask <<= (32 - netbits);
+	net.s_addr = htonl(netmask);
+	ipstart.s_addr = my_ip & net.s_addr;
+
+	maxusers = (1 << (32-netbits)) - 3; /* 3: Net addr, broadcast addr, iodined addr */
+	usercount = MIN(maxusers, USERS);
+
+	users = calloc(usercount, sizeof(struct tun_user));
+	for (i = 0; i < usercount; i++) {
+		in_addr_t ip;
 		users[i].id = i;
-		snprintf(newip, sizeof(newip), "0.0.0.%d", i + 1);
-		users[i].tun_ip = my_ip + inet_addr(newip);;
-		users[i].inpacket.len = 0;
-		users[i].inpacket.offset = 0;
-		users[i].outpacket.len = 0;
-		users[i].q.id = 0;
+		snprintf(newip, sizeof(newip), "0.0.0.%d", i + skip + 1);
+		ip = ipstart.s_addr + inet_addr(newip);
+		if (ip == my_ip && skip == 0) {
+			/* This IP was taken by iodined */
+			skip++;
+			snprintf(newip, sizeof(newip), "0.0.0.%d", i + skip + 1);
+			ip = ipstart.s_addr + inet_addr(newip);
+		}
+		users[i].tun_ip = ip;
+		net.s_addr = ip;
+		users[i].disabled = 0;
+		users[i].authenticated = 0;
+		users[i].authenticated_raw = 0;
+		users[i].active = 0;
+ 		/* Rest is reset on login ('V' packet) */
 	}
+
+	return usercount;
+}
+
+const char*
+users_get_first_ip()
+{
+	struct in_addr ip;
+	ip.s_addr = users[0].tun_ip;
+	return strdup(inet_ntoa(ip));
 }
 
 int
@@ -52,13 +99,14 @@ users_waiting_on_reply()
 	int i;
 
 	ret = 0;
-	for (i = 0; i < USERS; i++) {
-		if (users[i].active && users[i].last_pkt + 60 > time(NULL) &&
-			users[i].q.id != 0) {
+	for (i = 0; i < usercount; i++) {
+		if (users[i].active && !users[i].disabled &&
+			users[i].last_pkt + 60 > time(NULL) &&
+			users[i].q.id != 0 && users[i].conn == CONN_DNS_NULL) {
 			ret++;
 		}
 	}
-	
+
 	return ret;
 }
 
@@ -69,8 +117,11 @@ find_user_by_ip(uint32_t ip)
 	int i;
 
 	ret = -1;
-	for (i = 0; i < USERS; i++) {
-		if (users[i].active && users[i].last_pkt + 60 > time(NULL) &&
+	for (i = 0; i < usercount; i++) {
+		if (users[i].active &&
+			users[i].authenticated &&
+			!users[i].disabled &&
+			users[i].last_pkt + 60 > time(NULL) &&
 			ip == users[i].tun_ip) {
 			ret = i;
 			break;
@@ -81,6 +132,11 @@ find_user_by_ip(uint32_t ip)
 
 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
+   the outpacket-queue, so that sending back-to-back is possible
+   without going through another select loop.
+*/
 {
 	time_t now;
 	int ret;
@@ -88,9 +144,18 @@ all_users_waiting_to_send()
 
 	ret = 1;
 	now = time(NULL);
-	for (i = 0; i < USERS; i++) {
-		if (users[i].active && users[i].last_pkt + 60 > now &&
-			users[i].outpacket.len == 0) {
+	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;
 		}
@@ -103,11 +168,15 @@ find_available_user()
 {
 	int ret = -1;
 	int i;
-	for (i = 0; i < USERS; 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)) {
+		if ((!users[i].active || users[i].last_pkt + 60 < time(NULL)) && !users[i].disabled) {
 			users[i].active = 1;
+			users[i].authenticated = 0;
+			users[i].authenticated_raw = 0;
 			users[i].last_pkt = time(NULL);
+			users[i].fragsize = 4096;
+			users[i].conn = CONN_DNS_NULL;
 			ret = i;
 			break;
 		}
@@ -115,3 +184,24 @@ find_available_user()
 	return ret;
 }
 
+void
+user_switch_codec(int userid, struct encoder *enc)
+{
+	if (userid < 0 || userid >= usercount)
+		return;
+
+	users[userid].encoder = enc;
+}
+
+void
+user_set_conn_type(int userid, enum connection c)
+{
+	if (userid < 0 || userid >= usercount)
+		return;
+
+	if (c < 0 || c >= CONN_MAX)
+		return;
+
+	users[userid].conn = c;
+}
+