使用 libssh2 连接到远程服务器，libssh2连接服务器,/* * Sample

使用 libssh2 连接到远程服务器，libssh2连接服务器,/* * Sample

/* * Sample showing how to do SSH2 connect. * * The sample code has default values for host name, user name, password * and path to copy, but you can specify them on the command line like: * * "ssh2 host user password [-p|-i|-k]" */ #include "libssh2_config.h"#include <libssh2.h>#include <libssh2_sftp.h>#ifdef HAVE_WINDOWS_H#include <windows.h>#endif#ifdef HAVE_WINSOCK2_H#include <winsock2.h>#endif#ifdef HAVE_SYS_SOCKET_H#include <sys/socket.h>#endif#ifdef HAVE_NETINET_IN_H#include <netinet/in.h>#endif#ifdef HAVE_UNISTD_H#include <unistd.h>#endif#ifdef HAVE_ARPA_INET_H#include <arpa/inet.h>#endif#include <sys/types.h>#include <fcntl.h>#include <errno.h>#include <stdio.h>#include <ctype.h>const char *keyfile1="~/.ssh/id_rsa.pub";const char *keyfile2="~/.ssh/id_rsa";const char *username="username";const char *password="password";static void kbd_callback(const char *name, int name_len,                         const char *instruction, int instruction_len,                         int num_prompts,                         const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts,                         LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses,                         void **abstract){    (void)name;    (void)name_len;    (void)instruction;    (void)instruction_len;    if (num_prompts == 1) {        responses[0].text = strdup(password);        responses[0].length = strlen(password);    }    (void)prompts;    (void)abstract;} /* kbd_callback */ int main(int argc, char *argv[]){    unsigned long hostaddr;    int rc, sock, i, auth_pw = 0;    struct sockaddr_in sin;    const char *fingerprint;    char *userauthlist;    LIBSSH2_SESSION *session;    LIBSSH2_CHANNEL *channel;#ifdef WIN32    WSADATA wsadata;    WSAStartup(MAKEWORD(2,0), &wsadata);#endif    if (argc > 1) {        hostaddr = inet_addr(argv[1]);    } else {        hostaddr = htonl(0x7F000001);    }    if(argc > 2) {        username = argv[2];    }    if(argc > 3) {        password = argv[3];    }    rc = libssh2_init (0);    if (rc != 0) {        fprintf (stderr, "libssh2 initialization failed (%d)\n", rc);        return 1;    }    /* Ultra basic "connect to port 22 on localhost".  Your code is     * responsible for creating the socket establishing the connection     */     sock = socket(AF_INET, SOCK_STREAM, 0);    sin.sin_family = AF_INET;    sin.sin_port = htons(22);    sin.sin_addr.s_addr = hostaddr;    if (connect(sock, (struct sockaddr*)(&sin),                sizeof(struct sockaddr_in)) != 0) {        fprintf(stderr, "failed to connect!\n");        return -1;    }    /* Create a session instance and start it up. This will trade welcome     * banners, exchange keys, and setup crypto, compression, and MAC layers     */     session = libssh2_session_init();    if (libssh2_session_handshake(session, sock)) {        fprintf(stderr, "Failure establishing SSH session\n");        return -1;    }    /* At this point we havn't 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);    printf("Fingerprint: ");    for(i = 0; i < 20; i++) {        printf("%02X ", (unsigned char)fingerprint[i]);    }    printf("\n");    /* check what authentication methods are available */     userauthlist = libssh2_userauth_list(session, username, strlen(username));    printf("Authentication methods: %s\n", userauthlist);    if (strstr(userauthlist, "password") != NULL) {        auth_pw |= 1;    }    if (strstr(userauthlist, "keyboard-interactive") != NULL) {        auth_pw |= 2;    }    if (strstr(userauthlist, "publickey") != NULL) {        auth_pw |= 4;    }    /* if we got an 4. argument we set this option if supported */     if(argc > 4) {        if ((auth_pw & 1) && !strcasecmp(argv[4], "-p")) {            auth_pw = 1;        }        if ((auth_pw & 2) && !strcasecmp(argv[4], "-i")) {            auth_pw = 2;        }        if ((auth_pw & 4) && !strcasecmp(argv[4], "-k")) {            auth_pw = 4;        }    }    if (auth_pw & 1) {        /* We could authenticate via password */         if (libssh2_userauth_password(session, username, password)) {            printf("\tAuthentication by password failed!\n");            goto shutdown;        } else {            printf("\tAuthentication by password succeeded.\n");        }    } else if (auth_pw & 2) {        /* Or via keyboard-interactive */         if (libssh2_userauth_keyboard_interactive(session, username,                                                  &kbd_callback) ) {            printf("\tAuthentication by keyboard-interactive failed!\n");            goto shutdown;        } else {            printf("\tAuthentication by keyboard-interactive succeeded.\n");        }    } else if (auth_pw & 4) {        /* Or by public key */         if (libssh2_userauth_publickey_fromfile(session, username, keyfile1,                                                keyfile2, password)) {            printf("\tAuthentication by public key failed!\n");            goto shutdown;        } else {            printf("\tAuthentication by public key succeeded.\n");        }    } else {        printf("No supported authentication methods found!\n");        goto shutdown;    }    /* Request a shell */     if (!(channel = libssh2_channel_open_session(session))) {        fprintf(stderr, "Unable to open a session\n");        goto shutdown;    }    /* Some environment variables may be set,     * It's up to the server which ones it'll allow though     */     libssh2_channel_setenv(channel, "FOO", "bar");    /* Request a terminal with 'vanilla' terminal emulation     * See /etc/termcap for more options     */     if (libssh2_channel_request_pty(channel, "vanilla")) {        fprintf(stderr, "Failed requesting pty\n");        goto skip_shell;    }    /* Open a SHELL on that pty */     if (libssh2_channel_shell(channel)) {        fprintf(stderr, "Unable to request shell on allocated pty\n");        goto shutdown;    }    /* At this point the shell can be interacted with using     * libssh2_channel_read()     * libssh2_channel_read_stderr()     * libssh2_channel_write()     * libssh2_channel_write_stderr()     *     * Blocking mode may be (en|dis)abled with: libssh2_channel_set_blocking()     * If the server send EOF, libssh2_channel_eof() will return non-0     * To send EOF to the server use: libssh2_channel_send_eof()     * A channel can be closed with: libssh2_channel_close()     * A channel can be freed with: libssh2_channel_free()     */   skip_shell:    if (channel) {        libssh2_channel_free(channel);        channel = NULL;    }    /* Other channel types are supported via:     * libssh2_scp_send()     * libssh2_scp_recv()     * libssh2_channel_direct_tcpip()     */   shutdown:    libssh2_session_disconnect(session,                               "Normal Shutdown, Thank you for playing");    libssh2_session_free(session);#ifdef WIN32    closesocket(sock);#else    close(sock);#endif    printf("all done!\n");    libssh2_exit();    return 0;}