[英]How to pipe through the output of hping3 from child to parent?
我最近问了一个有关如何在ac程序中调用hping3的问题。 提供的解决方案有效,但是我现在有另一个问题。 hping3的输出必须传递给父进程,所以我做了以下工作。 请注意,这只是codenippet,我认为错误在其中。 以下代码段在循环内运行,在其中循环访问一系列ip地址,这对于在我的mpi程序中提供两种不同的分发策略很有必要。
//Stick together the params
sprintf(params, "--scan %u %u.%u.%u.%u -V", *(portarray + i), (iterator & 0xFF000000)>>24, (iterator & 0x00FF0000)>>16, (iterator & 0x0000FF00)>>8, (iterator & 0x000000FF));
//Pipe and check status
if(pipe(pipes)==-1){
perror("Error piping");
}
//Fork and check status
pid=fork();
if(pid == -1){
perror("Error forking");
} else if(pid > 0){
//Parent does not write
close(pipes[1]);
//Save stdout from pipe
nbytes = read(pipes[0], buffer, sizeof(buffer));
//Parent, wait for child
waitpid(pid, &status, 0);
//Print out pipe
printf("hping3: (%.*s)\n", nbytes, buffer);
wait(NULL);
close(pipes[0]);
} else {
//Child does not read
close(pipes[0]);
//Map stdout and stderr to write pipe-end
dup2(pipes[1], 1);
dup2(pipes[1], 2);
//Child, exec hping with params
execl("sudo /usr/sbin/hping3","sudo /usr/sbin/hping3",params,NULL);
close(pipes[1]);
//Exit child to prevent fork-bomb
return 0;
}
//Sleep for specified delaytime
sleep((unsigned int)delay);
我不知道问题出在哪里。 输出如下(当然是循环的):
hping3()
hping3程序将输出到stdout和stderr,我通过输出重定向到文件在外壳上对其进行了测试。
如何定义缓冲区? 您是否检查过nbytes的值? 您确定正在执行hping吗? 我会尝试以下方法:
int buffsize = 100;
char * buffer = malloc(buffsize);
if (pid == -1) {
perror("Error forking");
} else if (pid > 0) {
//Parent does not write
close(pipes[1]);
// I'd first wait for the child to finish.
waitpid(pid, &status, 0);
// Save stdout from pipe
// recall that sizeof(buffer) != buffsize when malloc'ed.
int count = 0;
while((nbytes = read(pipes[0], buffer+count, buffsize-count) != -1) count += nbytes;
//Print out pipe
printf("hping3: (%.*s)\n", nbytes, buffer);
wait(NULL);
close(pipes[0]);
} else {
//Child does not read
close(pipes[0]);
//Map stdout and stderr to write pipe-end
dup2(pipes[1],1);
dup2(pipes[1],2);
// Close pipes[1]
close(pipes[1]);
//Child, exec hping with params
if (execl("sudo /usr/sbin/hping3","sudo /usr/sbin/hping3",params,NULL) == -1)
perror("execl error");
//Exit child to prevent fork-bomb
return 0;
}
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