vsftpd ftp client pwd implementation source code

来源：互联网发布：aes加密算法java 编辑：程序博客网时间：2024/05/16 18:48

#include<netdb.h>

#include<errno.h>
#include<arpa/inet.h>
#include<sys/stat.h>
#include<unistd.h>
#include<termios.h>
#include <stdio.h>
#include<strings.h>
#include<string.h>
struct sockaddr_in ftp_server;
int sock_control;
int sock_data;
struct timeval outtime;
int ret;
char rcv_buff[1024];
int reply_code;
int main()
{
bzero(&ftp_server,sizeof(struct sockaddr_in));
ftp_server.sin_family=AF_INET;
ftp_server.sin_port=htons(21);
ftp_server.sin_addr.s_addr=inet_addr("127.0.0.1");

#if 1
//connec to ftp server.
sock_control=socket(AF_INET,SOCK_STREAM,0);
if(sock_control<0)
{
    printf("create socket failed!\n");
    return -1;
}
outtime.tv_sec=0;
outtime.tv_usec=300000;
ret=setsockopt(sock_control,SOL_SOCKET,SO_RCVTIMEO,&outtime,sizeof(outtime));
if(ret!=0)
{
    printf("setsockopt failed!\n");
    return -1;
}
if(connect(sock_control,(struct sockaddr *)&ftp_server,sizeof(struct sockaddr_in))<0)
{
    return -1;
}
#endif

//read server's reply.(welcome message).
#if 1
ret=read(sock_control,rcv_buff,1024);
if(ret>0)
{
    printf("read:@@ %s @@\n",rcv_buff);
    reply_code=atoi(rcv_buff);
    //continue to read the rest welcome message.
    while(1)
    {
      rcv_buff[ret]='\0';
      ret=read(sock_control,rcv_buff,1024);
      if (ret<=0)
      {
   break;
      }
      printf("read:@@ %s @@\n",rcv_buff);
    }
}
else
{
    printf("read welcome message failed\n");
    return -1;
}
#endif

#if 1
//ftp user login.
bzero(rcv_buff,sizeof(rcv_buff));
strcpy(rcv_buff,"USER shell.albert\r\n");
write(sock_control,rcv_buff,strlen(rcv_buff));
while(1)
{
    bzero(rcv_buff,sizeof(rcv_buff));
    ret=read(sock_control,rcv_buff,1024);
    if(ret>0)
    {
      printf("read:@@ %s @@\n",rcv_buff);
    }else{
      break;
    }
}
//PASS.
bzero(rcv_buff,sizeof(rcv_buff));
strcpy(rcv_buff,"PASS smartbean\r\n");
write(sock_control,rcv_buff,strlen(rcv_buff));
while(1)
{
    bzero(rcv_buff,sizeof(rcv_buff));
    ret=read(sock_control,rcv_buff,1024);
    if(ret>0)
    {
      printf("read:@@ %s @@\n",rcv_buff);
    }else{
      break;
    }
}
#endif

#if 1
//enter PASV(passive) mode.
bzero(rcv_buff,sizeof(rcv_buff));
strcpy(rcv_buff,"PASV\r\n");
write(sock_control,rcv_buff,strlen(rcv_buff));
bzero(rcv_buff,sizeof(rcv_buff));
while(1)
{
    ret=read(sock_control,rcv_buff,1024);
    if(ret>0)
    {
      printf("read:@@ %s @@\n",rcv_buff);
    }else{
      break;
    }
}
//parse out the port number.P1*256+P2.
int nPasvPort;
char *sPasvPort=0;
sPasvPort=strrchr(rcv_buff,',');
if(sPasvPort==NULL)
{
    printf("get pasv port1 error!\n");
    return;
}
nPasvPort=atoi(sPasvPort+1);
*sPasvPort='\0';
sPasvPort=strrchr(rcv_buff,',');
if(sPasvPort==NULL)
{
    printf("get pasv port2 error!\n");
    return;
}
nPasvPort+=atoi(sPasvPort+1)*256;
printf("pasv port=%d\n",nPasvPort);

//use new port to connect server to get the data connection.
ftp_server.sin_port=htons(nPasvPort);
sock_data=socket(AF_INET,SOCK_STREAM,0);
if(sock_data<0)
{
    printf("create socket failed!\n");
    return -1;
}
outtime.tv_sec=0;
outtime.tv_usec=300000;
ret=setsockopt(sock_data,SOL_SOCKET,SO_RCVTIMEO,&outtime,sizeof(outtime));
if(ret!=0)
{
    printf("setsockopt failed!\n");
    return -1;
}
if(connect(sock_data,(struct sockaddr *)&ftp_server,sizeof(struct sockaddr_in))<0)
{
    return -1;
}
printf("create data connection sucess!\n");

#endif

#if 1
//use PI(control channel) to send PWD command
//PWD's result was returned by PI.
bzero(rcv_buff,sizeof(rcv_buff));
strcpy(rcv_buff,"PWD\r\n");
write(sock_control,rcv_buff,strlen(rcv_buff));
bzero(rcv_buff,sizeof(rcv_buff));
while(1)
{
    ret=read(sock_control,rcv_buff,1024);
    if(ret>0)
    {
      printf("read:@@ %s @@\n",rcv_buff);
    }else{
      break;
    }
}
#endif

return 0;
}

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