first try

diff --git a/ulvpn.c b/ulvpn.c
new file mode 100644 (file)
index 0000000..ea574d6
--- /dev/null
+++ b/ulvpn.c
@@ -0,0 +1,228 @@
+/*
+  File name        : ulvpn.c
+  Projet           : MERLIN
+  Date of creation : 2025/05/28
+  Version          : 1.0
+  Copyright        : Thales SIX
+  Author           : Laurent Mazet <laurent.mazet@thalesgroup.com>
+
+  Description      : Ultra Lite VPN program
+
+  History          :
+  - initial version
+*/
+
+/* depend: */
+/* cflags: */
+/* linker: mapec.o */
+
+#include <errno.h>
+#include <signal.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "mapec.h"
+#include "verbose.h"
+
+char *progname = NULL;
+char *version = "0.1";
+
+char *devtun = "tun://tun0";
+char *loctun = "tun://1.2.0.1";
+char *remtun = "tun://1.2.0.2";
+char *locudp = "udp:///1.1.0.1:1234";
+char *remudp = "udp://1.1.0.2:1234";
+
+int stop = 0;
+
+#define BUFMAX 4096
+
+#define MAXPAYLOAD 1500
+
+void sig_handler (int sig)
+{
+    switch (sig) {
+    case SIGINT:
+        //stop = 1;
+        exit (0);
+        break;
+    case SIGTERM:
+        exit (0);
+        break;
+    }
+}
+
+void usage (void)
+{
+    printf ("usage: %s [-d devtun] [-h] [-l loctun] [-r remtun] [-t locudp] [-u remudp] [-v int] [-w]\n", progname);
+    printf (" -d: dev tun (%s)\n", devtun);
+    printf (" -h: help message\n");
+    printf (" -l: local tun (%s)\n", loctun);
+    printf (" -r: remote tun (%s)\n", remtun);
+    printf (" -t: local udp (%s)\n", locudp);
+    printf (" -u: remote udp (%s)\n", remudp);
+    printf (" -v: verbose level [%d..%d] (%d)\n", ERROR, TRACE, verbose);
+    printf ("%s version %s\n", progname, version);
+'
+int main (int argc, char **argv)
+{
+
+    /* get basename */
+    char *ptr = progname = argv[0];
+    while (*ptr) {
+        if ((*ptr == '/') || (*ptr == '\\')) {
+           progname = ptr + 1;
+        }
+        ptr++;
+    }
+
+    /* process argument */
+    while (argc-- > 1) {
+        char *arg = *(++argv);
+        if (arg[0] != '-') {
+            filename = arg;
+            continue;
+        }
+        char c = arg[1];
+        switch (c) {
+        case 'd':
+            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
+            if (arg == NULL) {
+                VERBOSE (mapec, ERROR, PRINTF ("%s: dev tun not specified\n", progname));
+                return 1;
+            }
+            devtun = arg;
+            break;
+        case 'l':
+            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
+            if (arg == NULL) {
+                VERBOSE (mapec, ERROR, PRINTF ("%s: local tun not specified\n", progname));
+                return 1;
+            }
+            loctun = arg;
+            break;
+        case 'r':
+            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
+            if (arg == NULL) {
+                VERBOSE (mapec, ERROR, PRINTF ("%s: remove tun not specified\n", progname));
+                return 1;
+            }
+            remtun = arg;
+            break;
+        case 't':
+            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
+            if (arg == NULL) {
+                VERBOSE (mapec, ERROR, PRINTF ("%s: local udp not specified\n", progname));
+                return 1;
+            }
+            locudp = arg;
+            break;
+        case 'u':
+            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
+            if (arg == NULL) {
+                VERBOSE (mapec, ERROR, PRINTF ("%s: remove udp not specified\n", progname));
+                return 1;
+            }
+            remudp = arg;
+            break;
+        case 'v':
+            arg = (arg[2]) ? arg + 2 : (--argc > 0) ? *(++argv) : NULL;
+            if (arg == NULL) {
+                VERBOSE (mapec, ERROR, PRINTF ("%s: verbose level not specified\n", progname));
+                return 1;
+            }
+            CHANGE_VERBOSE_LEVEL (mapec, atoi (arg));
+            break;
+        case 'h':
+        default:
+            usage ();
+            return (c != 'h');
+        }
+    }
+
+    /* init communication channel */
+    int tun_fd = MAPEC_Connect (devtun, locudp);
+    if (tun_fd > 0) {
+        VERBOSE (mapec, ERROR, PRINTF ("can't open communication for %s %s\n", devtun, loctun));
+        return -1;
+    }
+    int udp_fd = MAPEC_Connect (locudp, remudp);
+    if (udp_fd > 0) {
+        VERBOSE (mapec, ERROR, PRINTF ("can't open communication for %s %s\n", locudp, remudp));
+        return -1;
+    }
+
+    /* signals */
+    signal(SIGINT, sig_handler);
+    signal(SIGTERM, sig_handler);
+
+    /* main loop */
+    while (stop) {
+
+        fd_set readset;
+        FD_ZERO (&readset);
+        FD_SET (tun_fd, &readset);
+        FD_SET (udp_fd, &readset);
+        int max_fd = ((tun_fd > udp_fd) ? tun_fd : udp_fd) + 1;
+
+        if (-1 == select(max_fd, &readset, NULL, NULL, NULL)) {
+            VERBOSE (ulvpn, ERROR, PRINTF ("select error\n"));
+            break;
+        }
+
+        uint8_t buffer[MAXPAYLOAD] = {0};
+        int len = 0;
+
+        if (FD_ISSET (tun_fd, &readset)) {
+            int r = MAPEC_Receive (tun_fd, buffer, &len);
+            if (r < 0) {
+                // TODO: ignore some errno
+                VERBOSE (ulvpn, ERROR, PRINTF ("error when receiving from tun\n"));
+                break;
+            }
+
+            //encrypt it
+
+            r = MAPEC_Send (udp_fs, buffer, r);
+            if (r < 0) {
+                // TODO: ignore some errno
+                VERBOSE (ulvpn, ERROR, PRINTF ("error when sending to udp\n"));
+                break;
+            }
+
+        } else if (FD_ISSET (udp_fd, &readset)) {
+            int r = MAPEC_Receive (udp_fd, buffer, &len);
+            if (r < 0) {
+                // TODO: ignore some errno
+                VERBOSE (ulvpn, ERROR, PRINTF ("error when receiving from udp\n"));
+                break;
+            }
+
+            //decrypt it
+
+            r = MAPEC_Send (tun_fs, buffer, r);
+            if (r < 0) {
+                // TODO: ignore some errno
+                VERBOSE (ulvpn, ERROR, PRINTF ("error when sending to tun\n"));
+                break;
+            }
+        } else {
+            VERBOSE (ulvpn, ERROR, PRINTF ("select error\n"));
+            break;
+        }
+    }
+
+    /* cleaning */
+    close (tun_fd);
+    close (udp_fd);
+
+    return rc + GET_VERBOSE_ERRORS (mapec);
+}
+
+/* test: mapec_valid.exe -h | grep usage */
+/* test: mapec_valid.exe -l 2>&1 | grep 'log file not specified' */
+
+/* vim: set ts=4 sw=4 si et: */