C/C++编程：使用libssh2在远程服务器上执行多条命令

我就是我 2023-01-10 14:44 5阅读 0赞

#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
    #ifdef HAVE_SYS_TIME_H
    #include <sys/time.h>
    #endif
    #include <sys/types.h>
    #ifdef HAVE_STDLIB_H
    #include <stdlib.h>
    #endif
    #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 = "cd /home/data/sftp_mkdir; tar -xvf test.tar.gz;  cd  test; chmod 777 runsdksrv ; nohup ./runsdksrv > /dev/null 2>&1 &; netstat -anp | grep 8080";
        const char *username    = "root";
        const char *password    = "123xhy";
        unsigned long hostaddr;
        int sock;
        struct sockaddr_in sin;
        LIBSSH2_SESSION *session;
        LIBSSH2_CHANNEL *channel;
        int rc;
        int exitcode;
        char *exitsignal = (char *)"none";
        int bytecount = 0;
    
    
    
        rc = libssh2_init(0);
        if(rc != 0) {
        
            fprintf(stderr, "libssh2 initialization failed (%d)\n", rc);
            return 1;
        }
    
        hostaddr = inet_addr(hostname);
        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);
        while((rc = libssh2_session_handshake(session, sock)) ==
    
              LIBSSH2_ERROR_EAGAIN);
        if(rc) {
        
            fprintf(stderr, "Failure establishing SSH session: %d\n", rc);
            return -1;
        }
    
    
        /* 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;
        }
    
    
        /* Exec non-blocking on the remove host */
        while((channel = libssh2_channel_open_session(session)) == NULL &&
              libssh2_session_last_error(session, NULL, NULL, 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, NULL, NULL, NULL, NULL);
        }
    
        if(exitsignal)
            fprintf(stderr, "\nGot signal: %s\n", exitsignal);
        else
            fprintf(stderr, "\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);
        close(sock);
    
    
    
        fprintf(stderr, "all done\n");
        libssh2_exit();
    
    
        return 0;
    }