libssh2 执行命令

概述libssh2 执行命令

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/* * Sample showing how to use libssh2 to execute a command remotely. * * The sample code has fixed values for host name,user name,password * and command to run. * * Run it like this: * * $ ./ssh2_exec 127.0.0.1 user password "uptime" * */  #include "libssh2_config.h"#include <libssh2.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_SYS_SELECT_H#include <sys/select.h>#endif#ifdef HAVE_UNISTD_H#include <unistd.h>#endif#ifdef HAVE_ARPA_INET_H#include <arpa/inet.h>#endif  #include <sys/time.h>#include <sys/types.h>#include <stdlib.h>#include <fcntl.h>#include <errno.h>#include <stdio.h>#include <ctype.h>  static int waitsocket(int socket_fd,liBSSH2_SESSION *session){    struct timeval timeout;    int rc;    fd_set fd;    fd_set *writefd = NulL;    fd_set *readfd = NulL;    int dir;      timeout.tv_sec = 10;    timeout.tv_usec = 0;      FD_ZERO(&fd);      FD_SET(socket_fd,&fd);      /* Now make sure we wait in the correct direction */    dir = libssh2_session_block_directions(session);       if(dir & liBSSH2_SESSION_BLOCK_INBOUND)        readfd = &fd;      if(dir & liBSSH2_SESSION_BLOCK_OUTBOUND)        writefd = &fd;      rc = select(socket_fd + 1,readfd,writefd,NulL,&timeout);      return rc;}  int main(int argc,char *argv[]){    const char *hostname = "127.0.0.1";    const char *commandline = "uptime";    const char *username    = "user";    const char *password    = "password";    unsigned long hostaddr;    int sock;    struct sockaddr_in sin;    const char *fingerprint;    liBSSH2_SESSION *session;    liBSSH2_CHANNEL *channel;    int rc;    int exitcode;    char *exitsignal=(char *)"none";    int bytecount = 0;    size_t len;    liBSSH2_KNowNHOSTS *nh;    int type;  #ifdef WIN32    WSADATA wsadata;    WSAStartup(MAKEWORD(2,0),&wsadata);#endif    if (argc > 1)        /* must be ip address only */        hostname = argv[1];      if (argc > 2) {        username = argv[2];    }    if (argc > 3) {        password = argv[3];    }    if (argc > 4) {        commandline = argv[4];    }      rc = libssh2_init (0);     if (rc != 0) {        fprintf (stderr,"libssh2 initialization Failed (%d)\n",rc);        return 1;    }      hostaddr = inet_addr(hostname);      /* 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 */    session = libssh2_session_init();     if (!session)        return -1;      /* tell libssh2 we want it all done non-blocking */    libssh2_session_set_blocking(session,0);       /* ... start it up. This will Trade welcome banners,exchange keys,* and setup crypto,compression,and MAC layers     */    while ((rc = libssh2_session_handshake(session,sock)) ==            liBSSH2_ERROR_EAGAIN);    if (rc) {        fprintf(stderr,"Failure establishing SSH session: %d\n",rc);        return -1;    }      nh = libssh2_kNownhost_init(session);     if(!nh) {        /* eeek,do cleanup here */        return 2;    }      /* read all hosts from here */    libssh2_kNownhost_readfile(nh,"kNown_hosts",liBSSH2_KNowNHOST_file_OPENSSH);      /* store all kNown hosts to here */    libssh2_kNownhost_writefile(nh,"dumpfile",liBSSH2_KNowNHOST_file_OPENSSH);      fingerprint = libssh2_session_hostkey(session,&len,&type);     if(fingerprint) {        struct libssh2_kNownhost *host;#if liBSSH2_VERSION_NUM >= 0x010206        /* introduced in 1.2.6 */        int check = libssh2_kNownhost_checkp(nh,hostname,22,fingerprint,len,liBSSH2_KNowNHOST_TYPE_PLAIN|                                             liBSSH2_KNowNHOST_KEYENC_RAW,&host);#else        /* 1.2.5 or older */        int check = libssh2_kNownhost_check(nh,liBSSH2_KNowNHOST_TYPE_PLAIN|                                            liBSSH2_KNowNHOST_KEYENC_RAW,&host);#endif        fprintf(stderr,"Host check: %d,key: %s\n",check,(check <= liBSSH2_KNowNHOST_CHECK_MISMATCH)?                host->key:"<none>");          /*****         * At this point,we Could verify that 'check' tells us the key is         * fine or bail out.         *****/    }    else {        /* eeek,do cleanup here */        return 3;    }    libssh2_kNownhost_free(nh);       if ( strlen(password) != 0 ) {        /* We Could authenticate via password */        while ((rc = libssh2_userauth_password(session,username,password)) ==                liBSSH2_ERROR_EAGAIN);        if (rc) {            fprintf(stderr,"Authentication by password Failed.\n");            goto shutdown;        }    }    else {        /* Or by public key */        while ((rc = libssh2_userauth_publickey_fromfile(session,"/home/user/"                                                         ".ssh/ID_rsa.pub","/home/user/"                                                         ".ssh/ID_rsa",password)) ==               liBSSH2_ERROR_EAGAIN);        if (rc) {            fprintf(stderr,"\tAuthentication by public key Failed\n");            goto shutdown;        }    }  #if 0    libssh2_trace(session,~0 ); #endif      /* Exec non-blocking on the remove host */    while( (channel = libssh2_channel_open_session(session)) == NulL &&            libssh2_session_last_error(session,0) ==            liBSSH2_ERROR_EAGAIN )    {        waitsocket(sock,session);    }    if( channel == NulL )    {        fprintf(stderr,"Error\n");        exit( 1 );    }    while( (rc = libssh2_channel_exec(channel,commandline)) ==            liBSSH2_ERROR_EAGAIN )    {        waitsocket(sock,session);    }    if( rc != 0 )    {        fprintf(stderr,"Error\n");        exit( 1 );    }    for( ;; )    {        /* loop until we block */        int rc;        do        {            char buffer[0x4000];            rc = libssh2_channel_read( channel,buffer,sizeof(buffer) );             if( rc > 0 )            {                int i;                bytecount += rc;                fprintf(stderr,"We read:\n");                for( i=0; i < rc; ++i )                    fputc( buffer[i],stderr);                fprintf(stderr,"\n");            }            else {                if( rc != liBSSH2_ERROR_EAGAIN )                    /* no need to output this for the EAGAIN case */                    fprintf(stderr,"libssh2_channel_read returned %d\n",rc);            }        }        while( rc > 0 );          /* this is due to blocking that would occur otherwise so we loop on           this condition */        if( rc == liBSSH2_ERROR_EAGAIN )        {            waitsocket(sock,session);        }        else            break;    }    exitcode = 127;    while( (rc = libssh2_channel_close(channel)) == liBSSH2_ERROR_EAGAIN )         waitsocket(sock,session);      if( rc == 0 )    {        exitcode = libssh2_channel_get_exit_status( channel );         libssh2_channel_get_exit_signal(channel,&exitsignal,NulL);    }      if (exitsignal)        printf("\nGot signal: %s\n",exitsignal);    else        printf("\nEXIT: %d bytecount: %d\n",exitcode,bytecount);      libssh2_channel_free(channel);     channel = NulL;  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 done\n");      libssh2_exit();       return 0;}

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