Android support (#105) patch from Marcel Bokhorst

src/Android.mk

@@ -0,0 +1,22 @@
+#
+# iodine for Android
+#
+# by Marcel Bokhorst
+# http://blog.bokhorst.biz/5123/computers-en-internet/iodine-for-android/
+#
+# cd iodine-0.6.0-rc1/src
+# make base64u.h base64u.c
+# .../ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=Android.mk
+#
+
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := iodine
+LOCAL_SRC_FILES := tun.c dns.c read.c encoding.c login.c base32.c base64.c base64u.c base128.c md5.c common.c iodine.c client.c util.c
+LOCAL_CFLAGS    := -c -DANDROID -DLINUX -DIFCONFIGPATH=\"/system/bin/\" -Wall
+LOCAL_LDLIBS    := -lz
+
+include $(BUILD_EXECUTABLE)
+

src/android_dns.h

@@ -0,0 +1,39 @@
+
+#ifndef __FIX_ANDROID_H__
+#define __FIX_ANDROID_H__
+
+typedef struct {
+	unsigned id :16;
+	unsigned rd :1;
+	unsigned tc :1;
+	unsigned aa :1;
+	unsigned opcode :4;
+	unsigned qr :1;
+	unsigned rcode :4;
+	unsigned cd: 1;
+	unsigned ad: 1;
+	unsigned unused :1;
+	unsigned ra :1;
+	unsigned qdcount :16;
+	unsigned ancount :16;
+	unsigned nscount :16;
+	unsigned arcount :16;
+} HEADER;
+
+#define NOERROR		0
+#define FORMERR		1
+#define SERVFAIL	2
+#define NXDOMAIN	3
+#define NOTIMP		4
+#define REFUSED		5
+
+#define C_IN		1
+
+#define T_A			1
+#define T_CNAME		5
+#define T_NULL		10
+#define T_MX		15
+#define T_TXT		16
+#define T_SRV		33
+
+#endif

src/client.c

@@ -31,6 +31,9 @@
 #include "windows.h"
 #include <winsock2.h>
 #else
+#ifdef ANDROID
+#include "android_dns.h"
+#endif
 #include <arpa/nameser.h>
 #ifdef DARWIN
 #define BIND_8_COMPAT
@@ -148,6 +151,32 @@ client_get_conn()
 void
 client_set_nameserver(const char *cp, int port) 
 {
+#ifdef ANDROID
+	struct addrinfo hints, *result, *p;
+	memset(&hints, 0, sizeof(hints));
+	hints.ai_family = AF_INET;
+
+	char sport[10];
+	sprintf(sport, "%d", port);
+
+	getaddrinfo(cp, sport, &hints, &result);
+	if (result == NULL)
+		errx(1, "Cannot resolve %s:%s (no network?)",  cp, sport);
+	else {
+		for (p = result;p != NULL; p = p->ai_next) {
+			if (p->ai_family == AF_INET) { /* IPv4 */
+				struct sockaddr_in *ipv4 = (struct sockaddr_in *)p->ai_addr;
+				memset(&nameserv, 0, sizeof(nameserv));
+				nameserv.sin_family = AF_INET;
+				nameserv.sin_port = htons(port);
+				nameserv.sin_addr = ipv4->sin_addr;
+				freeaddrinfo(result);
+				return;
+			}
+		}
+		freeaddrinfo(result);
+	}
+#endif
 	struct in_addr addr;
 
 	if (inet_aton(cp, &addr) != 1) {

src/common.c

@@ -54,7 +54,7 @@
 const unsigned char raw_header[RAW_HDR_LEN] = { 0x10, 0xd1, 0x9e, 0x00 };
 
 /* daemon(3) exists only in 4.4BSD or later, and in GNU libc */
-#if !defined(WINDOWS32) && !(defined(BSD) && (BSD >= 199306)) && !defined(__GLIBC__)
+#if !defined(ANDROID) && !defined(WINDOWS32) && !(defined(BSD) && (BSD >= 199306)) && !defined(__GLIBC__)
 static int daemon(int nochdir, int noclose)
 {
  	int fd, i;
@@ -276,13 +276,15 @@ check_topdomain(char *str)
        return 0;
 }
 
-#ifdef WINDOWS32
+#if defined(WINDOWS32) || defined(ANDROID)
+#ifndef ANDROID
 int
 inet_aton(const char *cp, struct in_addr *inp)
 {
  inp->s_addr = inet_addr(cp);
  return inp->s_addr != INADDR_ANY;
 }
+#endif
 
 void
 warn(const char *fmt, ...)
@@ -291,11 +293,13 @@ warn(const char *fmt, ...)
 
 	va_start(list, fmt);
 	if (fmt) fprintf(stderr, fmt, list);
+#ifndef ANDROID
 	if (errno == 0) {
 		fprintf(stderr, ": WSA error %d\n", WSAGetLastError()); 
 	} else {
 		fprintf(stderr, ": %s\n", strerror(errno));
 	}
+#endif
 	va_end(list);
 }
 

src/common.h

@@ -119,8 +119,10 @@ void read_password(char*, size_t);
 
 int check_topdomain(char *);
 
-#ifdef WINDOWS32
+#if defined(WINDOWS32) || defined(ANDROID)
+#ifndef ANDROID
 int inet_aton(const char *cp, struct in_addr *inp);
+#endif
 
 void err(int eval, const char *fmt, ...);
 void warn(const char *fmt, ...);

src/dns.c

@@ -25,6 +25,9 @@
 #ifdef WINDOWS32
 #include "windows.h"
 #else
+#ifdef ANDROID
+#include "android_dns.h"
+#endif
 #include <arpa/nameser.h>
 #ifdef DARWIN
 #define BIND_8_COMPAT

src/iodined.c

@@ -1655,7 +1655,7 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
 		   requests during heavy upstream traffic.
 		   20msec: ~8 packs every 1/50sec = ~400 DNSreq/sec,
 		   or ~1200bytes every 1/50sec = ~0.5 Mbit/sec upstream */
-		for (userid = 0; userid < USERS; userid++) {
+		for (userid = 0; userid < created_users; userid++) {
 			if (users[userid].active && !users[userid].disabled &&
 			    users[userid].last_pkt + 60 > time(NULL)) {
 				users[userid].q_sendrealsoon_new = 0;
@@ -1707,7 +1707,7 @@ tunnel(int tun_fd, int dns_fd, int bind_fd)
 		}
 
 		/* Send realsoon's if tun or dns didn't already */
-		for (userid = 0; userid < USERS; userid++)
+		for (userid = 0; userid < created_users; userid++)
 			if (users[userid].active && !users[userid].disabled &&
 			    users[userid].last_pkt + 60 > time(NULL) &&
 			    users[userid].q_sendrealsoon.id != 0 &&

src/tun.c

@@ -24,6 +24,10 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 
+#ifndef IFCONFIGPATH
+#define IFCONFIGPATH "/sbin/"
+#endif
+
 #ifdef WINDOWS32
 #include <winsock2.h>
 #include <winioctl.h>
@@ -71,7 +75,11 @@ open_tun(const char *tun_device)
 	int i;
 	int tun_fd;
 	struct ifreq ifreq;
+#ifdef ANDROID
+	char *tunnel = "/dev/tun";
+#else
 	char *tunnel = "/dev/net/tun";
+#endif
 
 	if ((tun_fd = open(tunnel, O_RDWR)) < 0) {
 		warn("open_tun: %s: %s", tunnel, strerror(errno));
@@ -455,7 +463,7 @@ tun_setip(const char *ip, const char *other_ip, int netbits)
 	}
 #ifndef WINDOWS32
 	snprintf(cmdline, sizeof(cmdline), 
-			"/sbin/ifconfig %s %s %s netmask %s",
+			IFCONFIGPATH "ifconfig %s %s %s netmask %s",
 			if_name,
 			ip,
 #ifdef FREEBSD
@@ -522,7 +530,7 @@ tun_setmtu(const unsigned mtu)
 
 	if (mtu > 200 && mtu <= 1500) {
 		snprintf(cmdline, sizeof(cmdline), 
-				"/sbin/ifconfig %s mtu %u",
+				IFCONFIGPATH "ifconfig %s mtu %u",
 				if_name,
 				mtu);
 		

src/user.c

@@ -33,7 +33,8 @@
 #include "encoding.h"
 #include "user.h"
 
-struct user users[USERS];
+struct user *users;
+unsigned usercount;
 
 int
 init_users(in_addr_t my_ip, int netbits)
@@ -41,7 +42,6 @@ init_users(in_addr_t my_ip, int netbits)
 	int i;
 	int skip = 0;
 	char newip[16];
-	int created_users = 0;
 
 	int maxusers;
 
@@ -57,9 +57,10 @@ init_users(in_addr_t my_ip, int netbits)
 	ipstart.s_addr = my_ip & net.s_addr;
 
 	maxusers = (1 << (32-netbits)) - 3; /* 3: Net addr, broadcast addr, iodined addr */
+	usercount = MIN(maxusers, USERS);
 	
-	memset(users, 0, USERS * sizeof(struct user));
-	for (i = 0; i < USERS; i++) {
+	users = calloc(usercount, sizeof(struct user));
+	for (i = 0; i < usercount; i++) {
 		in_addr_t ip;
 		users[i].id = i;
 		snprintf(newip, sizeof(newip), "0.0.0.%d", i + skip + 1);
@@ -72,17 +73,12 @@ init_users(in_addr_t my_ip, int netbits)
 		}
 		users[i].tun_ip = ip;
 		net.s_addr = ip;
-		if (maxusers--  < 1) {
-			users[i].disabled = 1;
-		} else {
-			users[i].disabled = 0;
-			created_users++;
-		}
+		users[i].disabled = 0;
 		users[i].active = 0;
  		/* Rest is reset on login ('V' packet) */
 	}
 
-	return created_users;
+	return usercount;
 }
 
 const char*
@@ -100,7 +96,7 @@ users_waiting_on_reply()
 	int i;
 
 	ret = 0;
-	for (i = 0; i < USERS; i++) {
+	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) {
@@ -118,7 +114,7 @@ find_user_by_ip(uint32_t ip)
 	int i;
 
 	ret = -1;
-	for (i = 0; i < USERS; i++) {
+	for (i = 0; i < usercount; i++) {
 		if (users[i].active && !users[i].disabled &&
 			users[i].last_pkt + 60 > time(NULL) &&
 			ip == users[i].tun_ip) {
@@ -143,7 +139,7 @@ all_users_waiting_to_send()
 
 	ret = 1;
 	now = time(NULL);
-	for (i = 0; i < USERS; i++) {
+	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) || 
@@ -167,7 +163,7 @@ 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)) && !users[i].disabled) {
 			users[i].active = 1;
@@ -184,7 +180,7 @@ find_available_user()
 void
 user_switch_codec(int userid, struct encoder *enc)
 {
-	if (userid < 0 || userid >= USERS)
+	if (userid < 0 || userid >= usercount)
 		return;
 	
 	users[userid].encoder = enc;
@@ -193,7 +189,7 @@ user_switch_codec(int userid, struct encoder *enc)
 void
 user_set_conn_type(int userid, enum connection c)
 {
-	if (userid < 0 || userid >= USERS)
+	if (userid < 0 || userid >= usercount)
 		return;
 
 	if (c < 0 || c >= CONN_MAX)

src/user.h

@@ -73,7 +73,7 @@ struct user {
 #endif
 };
 
-extern struct user users[USERS];
+extern struct user *users;
 
 int init_users(in_addr_t, int);
 const char* users_get_first_ip();

src/util.c

@@ -25,6 +25,16 @@ get_resolvconf_addr()
 #ifndef WINDOWS32
 	char buf[80];
 	FILE *fp;
+#ifdef ANDROID
+	fp = popen("getprop net.dns1", "r");
+	if (fp == NULL)
+		err(1, "getprop net.dns1 failed");
+	if (fgets(buf, sizeof(buf), fp) == NULL)
+		err(1, "read getprop net.dns1 failed");
+	if (sscanf(buf, "%15s", addr) == 1)
+		rv = addr;
+	pclose(fp);
+#else
 	
 	rv = NULL;
 
@@ -41,6 +51,7 @@ get_resolvconf_addr()
 	}
 	
 	fclose(fp);
+#endif
 #else /* !WINDOWS32 */
 	FIXED_INFO  *fixed_info;
 	ULONG       buflen;

tests/user.c

@@ -32,10 +32,11 @@ START_TEST(test_init_users)
 	in_addr_t ip;
 	char givenip[16];
 	int i;
+	int count;
 
 	ip = inet_addr("127.0.0.1");
-	init_users(ip, 27);
-	for (i = 0; i < USERS; i++) {
+	count = init_users(ip, 27);
+	for (i = 0; i < count; i++) {
 		fail_unless(users[i].id == i);
 		fail_unless(users[i].q.id == 0);
 		fail_unless(users[i].inpacket.len == 0);