sptps_test: allow using a tun device instead of stdio.

diff --git a/src/sptps_test.c b/src/sptps_test.c
index 44cdeb7..eea8e75 100644 (file)
--- 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;