more test file: test_tun.cpp

opencv-motion-detect/test_tun.cpp

+#include <libssh2.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <sys/time.h>
+
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#include <string>
+using namespace std;
+
+#ifndef INADDR_NONE
+#define INADDR_NONE (in_addr_t)-1
+#endif
+ 
+const char *keyfile1 = "/home/username/.ssh/id_rsa.pub";
+const char *keyfile2 = "/home/username/.ssh/id_rsa";
+const char *username = "root";
+const char *password = "Hz123456";
+ 
+const char *server_ip = "47.56.83.236";
+ 
+const char *remote_listenhost = "localhost"; /* resolved by the server */ 
+int remote_wantport = 2222;
+int remote_listenport;
+ 
+const char *local_destip = "127.0.0.1";
+int local_destport = 22;
+ 
+enum {
+    AUTH_NONE = 0,
+    AUTH_PASSWORD,
+    AUTH_PUBLICKEY
+};
+
+
+int createReverseTun(string host, string port, string user, string password){
+    int ret = 0;
+
+    
+    return ret;
+}
+ 
+int main(int argc, char *argv[])
+{
+    int rc, i, auth = AUTH_NONE;
+    struct sockaddr_in sin;
+    socklen_t sinlen = sizeof(sin);
+    const char *fingerprint;
+    char *userauthlist;
+    LIBSSH2_SESSION *session;
+    LIBSSH2_LISTENER *listener = NULL;
+    LIBSSH2_CHANNEL *channel = NULL;
+    fd_set fds;
+    struct timeval tv;
+    ssize_t len, wr;
+    char buf[16384];
+
+    int sock = -1, forwardsock = -1;
+ 
+    if(argc > 1)
+        server_ip = argv[1];
+    if(argc > 2)
+        username = argv[2];
+    if(argc > 3)
+        password = argv[3];
+    if(argc > 4)
+        remote_listenhost = argv[4];
+    if(argc > 5)
+        remote_wantport = atoi(argv[5]);
+    if(argc > 6)
+        local_destip = argv[6];
+    if(argc > 7)
+        local_destport = atoi(argv[7]);
+ 
+    rc = libssh2_init(0);
+
+    if(rc != 0) {
+        fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
+        return 1;
+    }
+ 
+    /* Connect to SSH server */ 
+    sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+
+    if(sock == -1) {
+        perror("socket");
+        return -1;
+    }
+ 
+    sin.sin_family = AF_INET;
+    sin.sin_addr.s_addr = inet_addr(server_ip);
+    if(INADDR_NONE == sin.sin_addr.s_addr) {
+        perror("inet_addr");
+        return -1;
+    }
+    sin.sin_port = htons(22);
+    if(connect(sock, (struct sockaddr*)(&sin),
+                sizeof(struct sockaddr_in)) != 0) {
+        fprintf(stderr, "failed to connect!\n");
+        return -1;
+    }
+ 
+    /* Create a session instance */ 
+    session = libssh2_session_init();
+
+    if(!session) {
+        fprintf(stderr, "Could not initialize SSH session!\n");
+        return -1;
+    }
+ 
+    /* ... start it up. This will trade welcome banners, exchange keys,
+     * and setup crypto, compression, and MAC layers
+     */ 
+    rc = libssh2_session_handshake(session, sock);
+
+    if(rc) {
+        fprintf(stderr, "Error when starting up SSH session: %d\n", rc);
+        return -1;
+    }
+ 
+    /* At this point we havn't yet authenticated.  The first thing to do
+     * is check the hostkey's fingerprint against our known hosts Your app
+     * may have it hard coded, may go to a file, may present it to the
+     * user, that's your call
+     */ 
+    fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
+
+    fprintf(stderr, "Fingerprint: ");
+    for(i = 0; i < 20; i++)
+        fprintf(stderr, "%02X ", (unsigned char)fingerprint[i]);
+    fprintf(stderr, "\n");
+ 
+    /* check what authentication methods are available */ 
+    userauthlist = libssh2_userauth_list(session, username, strlen(username));
+
+    fprintf(stderr, "Authentication methods: %s\n", userauthlist);
+    if(strstr(userauthlist, "password"))
+        auth |= AUTH_PASSWORD;
+    if(strstr(userauthlist, "publickey"))
+        auth |= AUTH_PUBLICKEY;
+ 
+    /* check for options */ 
+    if(argc > 8) {
+        if((auth & AUTH_PASSWORD) && !strcasecmp(argv[8], "-p"))
+            auth = AUTH_PASSWORD;
+        if((auth & AUTH_PUBLICKEY) && !strcasecmp(argv[8], "-k"))
+            auth = AUTH_PUBLICKEY;
+    }
+ 
+    if(auth & AUTH_PASSWORD) {
+        if(libssh2_userauth_password(session, username, password)) {
+
+            fprintf(stderr, "Authentication by password failed.\n");
+            goto shutdown;
+        }
+    }
+    else if(auth & AUTH_PUBLICKEY) {
+        if(libssh2_userauth_publickey_fromfile(session, username, keyfile1,
+
+                                               keyfile2, password)) {
+            fprintf(stderr, "\tAuthentication by public key failed!\n");
+            goto shutdown;
+        }
+        fprintf(stderr, "\tAuthentication by public key succeeded.\n");
+    }
+    else {
+        fprintf(stderr, "No supported authentication methods found!\n");
+        goto shutdown;
+    }
+ 
+    fprintf(stderr, "Asking server to listen on remote %s:%d\n",
+        remote_listenhost, remote_wantport);
+ 
+    listener = libssh2_channel_forward_listen_ex(session, remote_listenhost,
+
+        remote_wantport, &remote_listenport, 1);
+    if(!listener) {
+        fprintf(stderr, "Could not start the tcpip-forward listener!\n"
+                "(Note that this can be a problem at the server!"
+                " Please review the server logs.)\n");
+        goto shutdown;
+    }
+ 
+    fprintf(stderr, "Server is listening on %s:%d\n", remote_listenhost,
+        remote_listenport);
+ 
+    fprintf(stderr, "Waiting for remote connection\n");
+    channel = libssh2_channel_forward_accept(listener);
+
+    if(!channel) {
+        fprintf(stderr, "Could not accept connection!\n"
+                "(Note that this can be a problem at the server!"
+                " Please review the server logs.)\n");
+        goto shutdown;
+    }
+ 
+    fprintf(stderr,
+        "Accepted remote connection. Connecting to local server %s:%d\n",
+        local_destip, local_destport);
+    forwardsock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if(forwardsock == -1) {
+        perror("socket");
+        goto shutdown;
+    }
+ 
+    sin.sin_family = AF_INET;
+    sin.sin_port = htons(local_destport);
+    sin.sin_addr.s_addr = inet_addr(local_destip);
+    if(INADDR_NONE == sin.sin_addr.s_addr) {
+        perror("inet_addr");
+        goto shutdown;
+    }
+    if(-1 == connect(forwardsock, (struct sockaddr *)&sin, sinlen)) {
+        perror("connect");
+        goto shutdown;
+    }
+ 
+    fprintf(stderr, "Forwarding connection from remote %s:%d to local %s:%d\n",
+        remote_listenhost, remote_listenport, local_destip, local_destport);
+ 
+    /* Must use non-blocking IO hereafter due to the current libssh2 API */ 
+    libssh2_session_set_blocking(session, 0);
+
+ 
+    while(1) {
+        FD_ZERO(&fds);
+        FD_SET(forwardsock, &fds);
+        tv.tv_sec = 0;
+        tv.tv_usec = 100000;
+        rc = select(forwardsock + 1, &fds, NULL, NULL, &tv);
+        if(-1 == rc) {
+            perror("select");
+            goto shutdown;
+        }
+        if(rc && FD_ISSET(forwardsock, &fds)) {
+            len = recv(forwardsock, buf, sizeof(buf), 0);
+            if(len < 0) {
+                perror("read");
+                goto shutdown;
+            }
+            else if(0 == len) {
+                fprintf(stderr, "The local server at %s:%d disconnected!\n",
+                    local_destip, local_destport);
+                goto shutdown;
+            }
+            wr = 0;
+            do {
+                i = libssh2_channel_write(channel, buf, len);
+
+                if(i < 0) {
+                    fprintf(stderr, "libssh2_channel_write: %d\n", i);
+                    goto shutdown;
+                }
+                wr += i;
+            } while(i > 0 && wr < len);
+        }
+        while(1) {
+            len = libssh2_channel_read(channel, buf, sizeof(buf));
+
+            if(LIBSSH2_ERROR_EAGAIN == len)
+                break;
+            else if(len < 0) {
+                fprintf(stderr, "libssh2_channel_read: %d", (int)len);
+                goto shutdown;
+            }
+            wr = 0;
+            while(wr < len) {
+                i = send(forwardsock, buf + wr, len - wr, 0);
+                if(i <= 0) {
+                    perror("write");
+                    goto shutdown;
+                }
+                wr += i;
+            }
+            if(libssh2_channel_eof(channel)) {
+
+                fprintf(stderr, "The remote client at %s:%d disconnected!\n",
+                    remote_listenhost, remote_listenport);
+                goto shutdown;
+            }
+        }
+    }
+ 
+shutdown:
+    close(forwardsock);
+    if(channel)
+        libssh2_channel_free(channel);
+    if(listener)
+        libssh2_channel_forward_cancel(listener);
+    libssh2_session_disconnect(session, "Client disconnecting normally");
+    libssh2_session_free(session);
+    close(sock);
+    libssh2_exit();
+ 
+    return 0;
+}
+