linux c语言写个telnet自动输入密码？（关于pipe、重定向疑问）

[停止抱怨]

我需要用c语言写个telnet自动连接并执行一些命令。思路：利用execlp()来执行 telnet 192.168.xx.xx 。利用pipe函数、重定向来输入密码和命令（交互）。不过重定向后，execlp（）执行了，但是输出看不到。密码输入管道也看不到，我不知道是不是成功登陆了。怎么处理？
我用fput输入密码和一句重启命令，，，，但是并没重启

[停止抱怨]

急急急！

[jiht594]

我知道python比较好弄
不是一定用c的话, 可以试试

[停止抱怨]

@killer1978 大神，搜到11年您发的帖子。。。写过用无阻塞2个piple结合fock实现了进程间双向管道调用telnet,再自动输入用户名，密码的代码。
请问我遇到的问题您怎么解决的？能否给份源码？

[赵4老师]

仅供参考：

#pragma comment(lib,"user32")
#include <stdio.h>
#include <windows.h>
int main() {
    SECURITY_ATTRIBUTES sa          = {0};
    STARTUPINFO         si          = {0};
    PROCESS_INFORMATION pi          = {0};
    HANDLE              hPipeOutputRead  = NULL;
    HANDLE              hPipeOutputWrite = NULL;
    HANDLE              hPipeInputRead   = NULL;
    HANDLE              hPipeInputWrite  = NULL;
    BOOL                bTest = 0;
    DWORD               dwNumberOfBytesRead = 0;
    DWORD               dwNumberOfBytesWrite = 0;
    CHAR                szMsg[100];
    CHAR                szBuffer[256];

    sa.nLength = sizeof(sa);
    sa.bInheritHandle = TRUE;
    sa.lpSecurityDescriptor = NULL;

    // Create pipe for standard output redirection.
    CreatePipe(&hPipeOutputRead,  // read handle
            &hPipeOutputWrite, // write handle
            &sa,      // security attributes
            0      // number of bytes reserved for pipe - 0 default
            );

    // Create pipe for standard input redirection.
    CreatePipe(&hPipeInputRead,  // read handle
            &hPipeInputWrite, // write handle
            &sa,      // security attributes
            0      // number of bytes reserved for pipe - 0 default
            );

    // Make child process use hPipeOutputWrite as standard out,
    // and make sure it does not show on screen.
    si.cb = sizeof(si);
    si.dwFlags     = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
    si.wShowWindow = SW_HIDE;
    si.hStdInput   = hPipeInputRead;
    si.hStdOutput  = hPipeOutputWrite;
    si.hStdError   = hPipeOutputWrite;

    CreateProcess (
          NULL, "cmd.exe",
          NULL, NULL,
          TRUE, 0,
          NULL, NULL,
          &si, &pi);

    // Now that handles have been inherited, close it to be safe.
    // You don't want to read or write to them accidentally.
    CloseHandle(hPipeOutputWrite);
    CloseHandle(hPipeInputRead);

    // Now test to capture DOS application output by reading
    // hPipeOutputRead.  Could also write to DOS application
    // standard input by writing to hPipeInputWrite.
    sprintf(szMsg, "dir *.txt /b\nexit\n");
    WriteFile(
          hPipeInputWrite,      // handle of the write end of our pipe
          &szMsg,               // address of buffer that send data
          18,                   // number of bytes to write
          &dwNumberOfBytesWrite,// address of number of bytes read
          NULL                  // non-overlapped.
          );

    while(TRUE)
    {
       bTest=ReadFile(
          hPipeOutputRead,      // handle of the read end of our pipe
          &szBuffer,            // address of buffer that receives data
          256,                  // number of bytes to read
          &dwNumberOfBytesRead, // address of number of bytes read
          NULL                  // non-overlapped.
          );

      if (!bTest){
          sprintf(szMsg, "Error #%d reading pipe.",GetLastError());
          MessageBox(NULL, szMsg, "WinPipe", MB_OK);
          break;
      }

      // do something with data.
      szBuffer[dwNumberOfBytesRead] = 0;  // null terminate
      MessageBox(NULL, szBuffer, "WinPipe", MB_OK);
    }

    // Wait for CONSPAWN to finish.
    WaitForSingleObject (pi.hProcess, INFINITE);

    // Close all remaining handles
    CloseHandle (pi.hProcess);
    CloseHandle (hPipeOutputRead);
    CloseHandle (hPipeInputWrite);

    return 0;
}

[停止抱怨]

谢谢楼上的大神，新手表示看不懂。好像不是我想要的

[停止抱怨]

急阿，有人知道怎么处理吗

[停止抱怨]

谢谢各位帮忙。。。已经解决。利用抓包软件看到现象。（代码和思路都是对的）因为无法看到输出。可以fgets来读取后输出

[赵4老师]

我的代码是Windows上用的。
Linux下没搞过pipe，坐等楼下大神现身。

[qldsrx]

自定义函数rw_popen来打开一个支持读写的进程，用rw_pclose关闭，附带测试代码，已通过测试

pid_t rw_popen(char* cmd, FILE **rfile, FILE **wfile) {
    int pipefd[2],pipefd2[2]; //管道描述符
    pid_t pid; //进程描述符

    if (pipe(pipefd) < 0) //建立管道
    {
        printf("rw_popen() pipe create error/n");
        return 0;
    }
    if (pipe(pipefd2) < 0) //建立管道
    {
        printf("rw_popen() pipe create error/n");
        return 0;
    }

    pid = fork(); //建立子进程

    if (pid < 0)
    return 0;

    if (0 == pid) //子进程中
    {
        close(pipefd[0]);
        dup2(pipefd[1], 1);
        close(pipefd[1]);
        dup2(pipefd2[0], 0);
        close(pipefd2[0]);
        close(pipefd[1]);
        char *argv[] = { "/bin/sh", "-c", cmd, NULL };
        if (execvp("/bin/sh", argv) < 0) //用exec族函数执行命令
        exit(1);
    }

    close(pipefd[1]);
    *rfile = fdopen(pipefd[0], "r");
    close(pipefd2[0]);
    *wfile = fdopen(pipefd2[1], "w");
    return pid;
}

void rw_pclose(pid_t pid, FILE *rfile, FILE *wfile) {
    int status;
    waitpid(pid, &status, 0);
    fclose(rfile);
    fclose(wfile);
}
int main() {
    char buf1[1024];
    FILE *file1, *file2;
    pid_t pid;
    pid = rw_popen("sh", &file1, &file2);
    if (pid) {
        fputs("pwd;exit;\n",file2);
        fflush(file2);
        if (fgets(buf1, 1400, file1)) {
            puts(buf1);
        }
        rw_pclose(pid, file1, file2);
    }
    return 1;
}

[sand6174]

有一段shell 脚本 ssh 自动输入密码的 echo "$0" function Help() { echo "ip;password;cmd..." exit 1 } if [ $# -lt 3 ]; then Help fi echo "ip: $1" echo "password: $2" cmd="" i=0 for arg in "$@" do let i++ if [ $i -le 2 ]; then continue fi cmd+="$arg " done echo "cmd: $cmd " expect -c "set timeout -1; spawn ssh -l root $1 \"$cmd\"; expect { yes/no { send \"yes\r\"; exp_continue } *password* { send \"$2\r\"; interact} }; expect eof; "

[sand6174]

引用 10 楼 sand6174 的回复:

有一段shell 脚本 ssh 自动输入密码的 echo "$0" function Help() { echo "ip;password;cmd..." exit 1 } if [ $# -lt 3 ]; then Help fi echo "ip: $1" echo "password: $2" cmd="" i=0 for arg in "$@" do let i++ if [ $i -le 2 ]; then continue fi cmd+="$arg " done echo "cmd: $cmd " expect -c "set timeout -1; spawn ssh -l root $1 \"$cmd\"; expect { yes/no { send \"yes\r\"; exp_continue } *password* { send \"$2\r\"; interact} }; expect eof; "

telnet 改改也能用

[hzfllz]

lz可以共享下你代码，在写个c的telnet自动登录

[停止抱怨]

代码就是12楼这样。。。显示不了我认为是因为重定向改变了输出位置，所以没输出到屏幕。

[赵4老师]

向12楼学习！

[dongshijian100]

你的是怎么解决的？我怎么在telnet链接上了之后执行的指令输出打印不出来。手动链接时回出现的账号密码提示行也打印不出来，退出提示倒是能打印。