使用 libssh2 连接到远程服务器

概述使用 libssh2 连接到远程服务器

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/* * 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,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,&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,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;}

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