libssh2 进行 SFTP 文件传输

/*
 * Sample showing how to do SFTP transfers.
 *
 * 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:
 *
 * "sftp 192.168.0.1 user password /tmp/secrets -p|-i|-k"
 */
  
#include "libssh2_config.h"
#include <libssh2.h>
#include <libssh2_sftp.h>
  
#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
#ifdef HAVE_SYS_TIME_H
#include <sys/time.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";
const char *sftppath="/tmp/TEST";
  
  
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)
{
    int i;
    size_t n;
    char buf[1024];
    (void)abstract;
  
    printf("Performing keyboard-interactive authentication.n");
  
    printf("Authentication name: '");
    fwrite(name,1,name_len,stdout);
    printf("'n");
  
    printf("Authentication instruction: '");
    fwrite(instruction,instruction_len,stdout);
    printf("'n");
  
    printf("Number of prompts: %dnn",num_prompts);
  
    for (i = 0; i < num_prompts; i++) {
        printf("Prompt %d from server: '",i);
        fwrite(prompts[i].text,prompts[i].length,stdout);
        printf("'n");
  
        printf("Please type response: ");
        fgets(buf,sizeof(buf),stdin);
        n = strlen(buf);
        while (n > 0 && strchr("rn",buf[n - 1]))
          n--;
        buf[n] = 0;
  
        responses[i].text = strdup(buf);
        responses[i].length = n;
  
        printf("Response %d from user is '",i);
        fwrite(responses[i].text,responses[i].length,stdout);
        printf("'nn");
    }
  
    printf("Done. Sending keyboard-interactive responses to server now.n");
}
  
  
int main(int argc,char *argv[])
{
    unsigned long hostaddr;
    int sock,i,auth_pw = 0;
    struct sockaddr_in sin;
    const char *fingerprint;
    char *userauthlist;
    LIBSSH2_SESSION *session;
    int rc;
    LIBSSH2_SFTP *sftp_session;
    LIBSSH2_SFTP_HANDLE *sftp_handle;
  
#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];
    }
    if(argc > 4) {
        sftppath = argv[4];
    }
  
    rc = libssh2_init (0);
 
    if (rc != 0) {
        fprintf (stderr,"libssh2 initialization failed (%d)n",rc);
        return 1;
    }
  
    /*
     * The application code is responsible for creating the socket
     * and 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
     */
    session = libssh2_session_init();
 
    if(!session)
        return -1;
  
    /* Since we have set non-blocking,tell libssh2 we are blocking */
    libssh2_session_set_blocking(session,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,"Failure establishing SSH session: %dn",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));
 
    printf("Authentication methods: %sn",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 > 5) {
        if ((auth_pw & 1) && !strcasecmp(argv[5],"-p")) {
            auth_pw = 1;
        }
        if ((auth_pw & 2) && !strcasecmp(argv[5],"-i")) {
            auth_pw = 2;
        }
        if ((auth_pw & 4) && !strcasecmp(argv[5],"-k")) {
            auth_pw = 4;
        }
    }
  
    if (auth_pw & 1) {
        /* We could authenticate via password */
        if (libssh2_userauth_password(session,password)) {
 
            fprintf(stderr,"Authentication by password failed.n");
            goto shutdown;
        }
    } 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;
    }
  
    fprintf(stderr,"libssh2_sftp_init()!n");
 
    sftp_session = libssh2_sftp_init(session);
 
  
    if (!sftp_session) {
        fprintf(stderr,"Unable to init SFTP sessionn");
        goto shutdown;
    }
  
    fprintf(stderr,"libssh2_sftp_open()!n");
 
    /* Request a file via SFTP */
    sftp_handle =
        libssh2_sftp_open(sftp_session,sftppath,LIBSSH2_FXF_READ,0);
 
  
    if (!sftp_handle) {
        fprintf(stderr,"Unable to open file with SFTP: %ldn",libssh2_sftp_last_error(sftp_session));
 
        goto shutdown;
    }
    fprintf(stderr,"libssh2_sftp_open() is done,now receive data!n");
 
    do {
        char mem[1024];
  
        /* loop until we fail */
        fprintf(stderr,"libssh2_sftp_read()!n");
 
        rc = libssh2_sftp_read(sftp_handle,mem,sizeof(mem));
 
        if (rc > 0) {
            write(1,rc);
        } else {
            break;
        }
    } while (1);
  
    libssh2_sftp_close(sftp_handle);
 
    libssh2_sftp_shutdown(sftp_session);
 
  
  shutdown:
  
    libssh2_session_disconnect(session,"Normal Shutdown,Thank you for playing");
 
    libssh2_session_free(session);
 
  
#ifdef WIN32
    closesocket(sock);
#else
    close(sock);
#endif
    fprintf(stderr,"all donen");
  
    libssh2_exit();
 
  
    return 0;
}