From: Guus Sliepen <guus@tinc-vpn.org>
Date: Tue, 15 Apr 2014 15:26:08 +0000 (+0200)
Subject: sptps_test: allow using a tun device instead of stdio.
X-Git-Tag: release-1.1pre11~124
X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=commitdiff_plain;h=475088ed77df925ce0680c9993305cd746742708

sptps_test: allow using a tun device instead of stdio.
---

diff --git a/src/sptps_test.c b/src/sptps_test.c
index 44cdeb73..eea8e755 100644
--- a/src/sptps_test.c
+++ b/src/sptps_test.c
@@ -19,6 +19,10 @@
 
 #include "system.h"
 
+#ifdef HAVE_LINUX
+#include <linux/if_tun.h>
+#endif
+
 #include <getopt.h>
 
 #include "crypto.h"
@@ -36,6 +40,8 @@ struct timeval now;
 static bool verbose;
 static bool readonly;
 static bool writeonly;
+static int in = 0;
+static int out = 1;
 
 static bool send_data(void *handle, uint8_t type, const char *data, size_t len) {
 	char hex[len * 2 + 1];
@@ -52,7 +58,7 @@ static bool receive_record(void *handle, uint8_t type, const char *data, uint16_
 	if(verbose)
 		fprintf(stderr, "Received type %d record of %hu bytes:\n", type, len);
 	if(!writeonly)
-		fwrite(data, len, 1, stdout);
+		write(out, data, len);
 	return true;
 }
 
@@ -76,6 +82,9 @@ static void usage() {
 			"  -d, --datagram          Enable datagram mode.\n"
 			"  -q, --quit              Quit when EOF occurs on stdin.\n"
 			"  -r, --readonly          Only send data from the socket to stdout.\n"
+#ifdef HAVE_LINUX
+			"  -t, --tun               Use a tun device instead of stdio.\n"
+#endif
 			"  -w, --writeonly         Only send data from stdin to the socket.\n"
 			"  -L, --packet-loss RATE  Fake packet loss of RATE percent.\n"
 			"  -R, --replay-window N   Set replay window to N bytes.\n"
@@ -88,13 +97,16 @@ int main(int argc, char *argv[]) {
 	program_name = argv[0];
 	bool initiator = false;
 	bool datagram = false;
+#ifdef HAVE_LINUX
+	bool tun = false;
+#endif
 	int packetloss = 0;
 	int r;
 	int option_index = 0;
 	ecdsa_t *mykey = NULL, *hiskey = NULL;
 	bool quit = false;
 
-	while((r = getopt_long(argc, argv, "dqrwL:W:v", long_options, &option_index)) != EOF) {
+	while((r = getopt_long(argc, argv, "dqrtwL:W:v", long_options, &option_index)) != EOF) {
 		switch (r) {
 			case 0:   /* long option */
 				break;
@@ -111,6 +123,16 @@ int main(int argc, char *argv[]) {
 				readonly = true;
 				break;
 
+			case 't': /* read only */
+#ifdef HAVE_LINUX
+				tun = true;
+#else
+				fprintf(stderr, "--tun is only supported on Linux.\n");
+				usage();
+				return 1;
+#endif
+				break;
+
 			case 'w': /* write only */
 				writeonly = true;
 				break;
@@ -154,6 +176,25 @@ int main(int argc, char *argv[]) {
 
 	srand(time(NULL));
 
+#ifdef HAVE_LINUX
+	if(tun) {
+		in = out = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
+		if(in < 0) {
+			fprintf(stderr, "Could not open tun device: %s\n", strerror(errno));
+			return 1;
+		}
+		struct ifreq ifr = {
+			.ifr_flags = IFF_TUN
+		};
+		if(ioctl(in, TUNSETIFF, &ifr)) {
+			fprintf(stderr, "Could not configure tun interface: %s\n", strerror(errno));
+			return 1;
+		}
+		ifr.ifr_name[IFNAMSIZ - 1] = 0;
+		fprintf(stderr, "Using tun interface %s\n", ifr.ifr_name);
+	}
+#endif
+
 #ifdef HAVE_MINGW
 	static struct WSAData wsa_state;
 	if(WSAStartup(MAKEWORD(2, 2), &wsa_state))
@@ -256,14 +297,14 @@ int main(int argc, char *argv[]) {
 		FD_ZERO(&fds);
 #ifndef HAVE_MINGW
 		if(!readonly && s.instate)
-			FD_SET(0, &fds);
+			FD_SET(in, &fds);
 #endif
 		FD_SET(sock, &fds);
 		if(select(sock + 1, &fds, NULL, NULL, NULL) <= 0)
 			return 1;
 
-		if(FD_ISSET(0, &fds)) {
-			ssize_t len = read(0, buf, sizeof buf);
+		if(FD_ISSET(in, &fds)) {
+			ssize_t len = read(in, buf, sizeof buf);
 			if(len < 0) {
 				fprintf(stderr, "Could not read from stdin: %s\n", strerror(errno));
 				return 1;