使用libssh2编写sftp上传文件工具

./configure --with-libssl-prefix=/opt/openssl-1.0.2t \

LDFLAGS="-Wl,-rpath-link,/opt/openssl-1.0.2t/lib" \

--prefix=/opt/libssh2_build_pc

make

make install

#include "libssh2_config.h"

#include <libssh2.h>

#include <libssh2_sftp.h>



# include <sys/socket.h>

# include <netinet/in.h>

#include <unistd.h>

# include <arpa/inet.h>

#include <sys/types.h>

#include <fcntl.h>

#include <errno.h>

#include <stdio.h>

#include <ctype.h>



int main(int argc, char *argv[])

{

    unsigned long hostaddr;

    int sock, i, auth_pw = 1;

    struct sockaddr_in sin;

    const char *fingerprint;

    LIBSSH2_SESSION *session;

    const char *username = "root";

    const char *password = "root";

    const char *loclfile = "/opt/aaa.tar";

    const char *sftppath = "/home/bbb.tar";

    int rc;

    FILE *local;

    LIBSSH2_SFTP *sftp_session;

    LIBSSH2_SFTP_HANDLE *sftp_handle;

    char mem[1024*100];

    size_t nread;

    char *ptr;



    hostaddr = inet_addr("192.168.1.131");



    rc = libssh2_init(0);

    if(rc != 0) {

        fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);

        return 1;

    }



    local = fopen(loclfile, "rb");

    if(!local)

    {

        fprintf(stderr, "Can't open local file %s\n", loclfile);

        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 = (in_addr_t)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: %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");



    if(auth_pw)

    {

        /* We could authenticate via password */

        if(libssh2_userauth_password(session, username, password))

        {

            fprintf(stderr, "Authentication by password failed.\n");

            goto shutdown;

        }

    }



    fprintf(stderr, "libssh2_sftp_init()!\n");

    sftp_session = libssh2_sftp_init(session);



    if(!sftp_session)

    {

        fprintf(stderr, "Unable to init SFTP session\n");

        goto shutdown;

    }



    fprintf(stderr, "libssh2_sftp_open()!\n");

    /* Request a file via SFTP */

    sftp_handle =

        libssh2_sftp_open(sftp_session, sftppath,

                      LIBSSH2_FXF_WRITE|LIBSSH2_FXF_CREAT|LIBSSH2_FXF_TRUNC,

                      LIBSSH2_SFTP_S_IRUSR|LIBSSH2_SFTP_S_IWUSR|

                      LIBSSH2_SFTP_S_IRGRP|LIBSSH2_SFTP_S_IROTH);



    if(!sftp_handle)

    {

        fprintf(stderr, "Unable to open file with SFTP\n");

        goto shutdown;

    }

    fprintf(stderr, "libssh2_sftp_open() is done, now send data!\n");

    do {

        nread = fread(mem, 1, sizeof(mem), local);

        if(nread <= 0)

        {

            /* end of file */

            break;

        }

        ptr = mem;



        do {

            /* write data in a loop until we block */

            rc = libssh2_sftp_write(sftp_handle, ptr, nread);

            if(rc < 0)

                break;

            ptr += rc;

            nread -= rc;

        } while(nread);



    } while(rc > 0);



    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);



    close(sock);

    if(local)

        fclose(local);

    fprintf(stderr, "all done\n");



    libssh2_exit();



    return 0;

}