ftp connection error

This is a discussion on ftp connection error within the Networking/Device Communication forums, part of the General Programming Boards category; Code: #include <windows.h> #include <stdio.h> WSADATA ws; int d; char aa[1000]; char usr[100]; char paswd[100]; struct sockaddr_in a; SOCKET s; ...

  1. #1
    Registered User
    Join Date
    Oct 2009
    Posts
    4

    ftp connection error

    Code:
    #include <windows.h>
    #include <stdio.h>
     
    WSADATA ws;
    int d;
    char aa[1000]; 
    char usr[100];
    char paswd[100];
    struct sockaddr_in a;
    SOCKET s;
    int ii;
    struct hostent *host;
     
     
    void abc(char *p)
    {
    	FILE *fp = fopen("b.txt","a+");
    	fprintf(fp,"%s\n",p);
    	fclose(fp);
    }
     
    _stdcall WinMain(HINSTANCE i, HINSTANCE j, char *k, int l)
    {
     
    		d = WSAStartup(0x101,&ws);
    		sprintf(aa," WSASTARTUP = %d",d);
    		abc(aa);
    		s = socket(AF_INET,SOCK_STREAM,0);
    		sprintf(aa," SOCKET = %d",s);
    		abc(aa);
    		host=gethostbyname("smartfile.com");
    		a.sin_family = AF_INET;
    		a.sin_port = htons(21);
    		a.sin_addr.s_addr = *((unsigned long*)host->h_addr); 
    		d = connect(s, (struct sockaddr *)&a, sizeof( a));
    	
        strcat(usr,"USER xyzab\r\n");
    		send(s,usr,sizeof(usr),0);
    		ii = 1;
    		ii = recv(s,aa,1000,0);
    		abc(aa);
    strcat(paswd,"PASS abcdeg\r\n");
    		send(s,paswd,sizeof(paswd),0);
        	ii = 1;
    		ii = recv(s,aa,1000,0);
    		abc(aa);
    }
    I need to upload a file using ftp connection so i wrote this code output i get is
    : WSASTARTUP = 0
    SOCKET = 1940
    220 208.88.252.31 FTP server ready

    331 Password required for illusionist


    500 Invalid command: try being more creative

    rd required for illusionist


    I can't figure out why password command give error


    plz help.....

  2. #2
    Registered User
    Join Date
    Sep 2004
    Location
    California
    Posts
    3,246
    You are sending garbage to the server:
    Code:
    strcat(usr,"USER xyzab\r\n");
    send(s,usr,sizeof(usr),0);
    So what are you sending to the server here?
    "USER xyzab\r\n\0<random garbage here>"
    Instead of sending the entire buffer, you need to just send the string:
    Code:
    send(s,usr,strlen(usr),0);
    Also, stop using strcat() where you should be using strcpy().
    bit∙hub [bit-huhb] n. A source and destination for information.

  3. #3
    Registered User
    Join Date
    Oct 2009
    Posts
    4
    Thanx it worked now i have completed code to upload a text file to server code for that is:


    Code:
     #include <windows.h>
    #include <stdio.h>
     
    WSADATA ws;
    int d;
    char aa[1000]; 
    char usr[100];
    char paswd[100]={0};
    char cmd[15]={0};
    struct sockaddr_in a;
    struct sockaddr_in a1;
    SOCKET s;
    SOCKET s1;
    int ii;
    struct hostent *host;
     
     int calcp(char p1[])
    {
      int i,k;
        int n;
        char port1[10];
        char port2[10];
        int por;
        i=k=n=por=0;
       while(p1[i] != '(' )
        i++;
        n=0;
        while(    n < 4   )
    {
        if( p1[i] == ',')
        n++;
        i++;
    }
    k=0;
    while(p1[i] != ',' )
    {
    port1[k++]=p1[i];
    i++;
    }
    i++;
    port1[k]='\0';
    k=0;
    while(p1[i] != ')' )
    {
    port2[k++]=p1[i];
    i++;
    }
    port2[k++]='\0';
    k=0;
    por= atoi(port1)*256 + atoi(port2);  
    }
    
    
    void abc(char *p)
    {
    	FILE *fp = fopen("b.txt","a+");
    	fprintf(fp,"%s\n",p);
    	fclose(fp);
    }
     
    _stdcall WinMain(HINSTANCE i, HINSTANCE j, char *k, int l)
    {
     
    		int  port=0;
            d = WSAStartup(0x101,&ws);
    		sprintf(aa," WSASTARTUP = %d",d);
    		abc(aa);
    		s = socket(AF_INET,SOCK_STREAM,0);
    		sprintf(aa," SOCKET = %d",s);
    		abc(aa);
    		host=gethostbyname("smartfile.com");
    		a.sin_family = AF_INET;
    		a.sin_port = htons(21);
    		a.sin_addr.s_addr = *((unsigned long*)host->h_addr); 
    		d = connect(s, (struct sockaddr *)&a, sizeof( a));
    	     strcpy(usr,"USER xxxxxxx\r\n");
    		send(s,usr,strlen(usr),0);
    		sleep(1000);
    		ii = 1;
    		ii = recv(s,aa,1000,0);
    		abc(aa);
    		strcpy(paswd,"PASS xxxxxx\r\n");
    		send(s,paswd,strlen(paswd),0);
    		sleep(1000);
        	ii = 1;
    		ii = recv(s,aa,1000,0);
    		abc(aa);
    		send(s,"TYPE I\r\n",8,0);
    		sleep(1000);
    		ii = 1;
    		ii = recv(s,aa,1000,0);
          	abc(aa);
    		send(s,"PASV\r\n",6,0);
    		sleep(1000);
    		ii = 1;
    		ii = recv(s,aa,1000,0);
    		abc(aa);
    		port=calcp(aa);
    		s1 = socket(AF_INET,SOCK_STREAM,0);
    		sprintf(aa," SOCKET = %d",s1);
    		abc(aa);
    		a1.sin_family = AF_INET;
    		a1.sin_port = htons(port);
    		a1.sin_addr.s_addr = *((unsigned long*)host->h_addr); 
    		d = connect(s1, (struct sockaddr *)&a1, sizeof( a1));
    		strcpy(cmd,"STOR /b.txt\r\n");
    		send(s1,cmd,strlen(cmd),0);
    		sleep(1000);
        	WSACleanup(); 
     }
    The code compiles well get executed but no file is uploaded any suggestions...
    Plz

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