From guo364 at oki.com  Tue Aug 19 12:54:05 2003
From: guo364 at oki.com (guo zhenglin)
Date: Tue Aug 19 05:54:22 2003
Subject: [ds6-devel] why I MUST set a value to scope_id? 
Message-ID: <003901c36605$8d453ae0$584911ac@t80c88>



1) I use "getaddrinfo" ,
 then socket(), 
then connect()
it return "Inavlid argument" error

2) then I use:
  
((struct sockaddr_in6 *)(res1->ai_addr))->sin6_scope_id =3
 /* 3 is my eth0 index */
 
then connect() is ok ,and send,recv also ok

3) I have test it on linux kernel 2.4.7-10 and 2.4.20
   both linux kernel have this problem.

4) my client program is following:

#include <stdio.h>

#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <errno.h>

int main(void)
{
 int mysock, myerr;
 int  i;
 struct addrinfo hints, *res0, *res1;
 char rcvmsg[100];
 char sndmsg[100];
 int rcvlen;

 memset(&hints, 0, sizeof(hints));
 hints.ai_family = PF_UNSPEC;
 hints.ai_socktype = SOCK_STREAM;

 myerr = getaddrinfo("fe80::210:5cff:fed7:46c6","5001", &hints, &res0);
 if(myerr) return -1;
 
 printf("\n getaddrinfo success");
 
 for(res1 = res0; res1; res1 = res1->ai_next)
 {
  printf("\n--------------------------------");
  printf("\n ai_flags:%d", res1->ai_flags);
  printf("\n ai_family:%d", res1->ai_family);
  printf("\n ai_socktype:%d", res1->ai_socktype);
  printf("\n ai_protocol:%d", res1->ai_protocol);
  printf("\n ai_addrlen:%d",  res1->ai_addrlen);
  printf("\n ai_cannonname:%s", res1->ai_canonname);
  printf("\n ai_next:%p",  res1->ai_next);
  printf("\n ai_addr:");
  for(i=0; i<res1->ai_addrlen; i++)
   printf("%02X ",(*((char *)(res1->ai_addr)+i))&0xFF);
  printf("\n IP:%d", (res1->ai_family==PF_INET6)? 6:4);
  
  printf("\n------------------------------------");
 
  mysock = socket(res1->ai_family, res1->ai_socktype, res1->ai_protocol);
  if(mysock<0){ printf("\n socket fail"); continue;}
  printf("\n socket success");   

  ((struct sockaddr_in6 *)(res1->ai_addr))->sin6_scope_id =3 ;  /* ??? */

  printf("\n connecting...\n");
  if(connect(mysock, res1->ai_addr, res1->ai_addrlen)<0)
  {
   perror("\n connect fail");
   close(mysock);
   continue;
  }
  printf("\n connect succ");
  memset(rcvmsg, 0, 100);
  rcvlen = recv(mysock, rcvmsg, 100, 0);
  printf("\n recvlen:%d", rcvlen);
  printf("\n recvmsg:%s", rcvmsg);
  strcpy(sndmsg, "THIS is a MSG from CLIENT side"); 
  send(mysock, sndmsg, strlen(sndmsg),0);
   
 } 
 close(mysock);
 printf("\n bye \n");

}


From eva at gsyc.escet.urjc.es  Tue Aug 19 11:12:50 2003
From: eva at gsyc.escet.urjc.es (Eva M. Castro)
Date: Tue Aug 19 10:14:23 2003
Subject: [ds6-devel] why I MUST set a value to scope_id?
In-Reply-To: <003901c36605$8d453ae0$584911ac@t80c88>
References: <003901c36605$8d453ae0$584911ac@t80c88>
Message-ID: <3F41DC02.5070904@gsyc.escet.urjc.es>

Suppose you have multiple ethernet adapters, if you use a link local
address as destination, your host does not know which ethernet adapter
use to send the packet. It is an ambiguos destination address if you
dont use the scope identifier in order to specify which ethernet adapter
should be used.

IMHO you should avoid using link local addresses from applications.

regards,

eva

guo zhenglin wrote:

>1) I use "getaddrinfo" ,
> then socket(), 
>then connect()
>it return "Inavlid argument" error
>
>2) then I use:
>  
>((struct sockaddr_in6 *)(res1->ai_addr))->sin6_scope_id =3
> /* 3 is my eth0 index */
> 
>then connect() is ok ,and send,recv also ok
>
>3) I have test it on linux kernel 2.4.7-10 and 2.4.20
>   both linux kernel have this problem.
>
>4) my client program is following:
>
>#include <stdio.h>
>
>#include <sys/socket.h>
>#include <sys/types.h>
>#include <netdb.h>
>#include <errno.h>
>
>int main(void)
>{
> int mysock, myerr;
> int  i;
> struct addrinfo hints, *res0, *res1;
> char rcvmsg[100];
> char sndmsg[100];
> int rcvlen;
>
> memset(&hints, 0, sizeof(hints));
> hints.ai_family = PF_UNSPEC;
> hints.ai_socktype = SOCK_STREAM;
>
> myerr = getaddrinfo("fe80::210:5cff:fed7:46c6","5001", &hints, &res0);
> if(myerr) return -1;
> 
> printf("\n getaddrinfo success");
> 
> for(res1 = res0; res1; res1 = res1->ai_next)
> {
>  printf("\n--------------------------------");
>  printf("\n ai_flags:%d", res1->ai_flags);
>  printf("\n ai_family:%d", res1->ai_family);
>  printf("\n ai_socktype:%d", res1->ai_socktype);
>  printf("\n ai_protocol:%d", res1->ai_protocol);
>  printf("\n ai_addrlen:%d",  res1->ai_addrlen);
>  printf("\n ai_cannonname:%s", res1->ai_canonname);
>  printf("\n ai_next:%p",  res1->ai_next);
>  printf("\n ai_addr:");
>  for(i=0; i<res1->ai_addrlen; i++)
>   printf("%02X ",(*((char *)(res1->ai_addr)+i))&0xFF);
>  printf("\n IP:%d", (res1->ai_family==PF_INET6)? 6:4);
>  
>  printf("\n------------------------------------");
> 
>  mysock = socket(res1->ai_family, res1->ai_socktype, res1->ai_protocol);
>  if(mysock<0){ printf("\n socket fail"); continue;}
>  printf("\n socket success");   
>
>  ((struct sockaddr_in6 *)(res1->ai_addr))->sin6_scope_id =3 ;  /* ??? */
>
>  printf("\n connecting...\n");
>  if(connect(mysock, res1->ai_addr, res1->ai_addrlen)<0)
>  {
>   perror("\n connect fail");
>   close(mysock);
>   continue;
>  }
>  printf("\n connect succ");
>  memset(rcvmsg, 0, 100);
>  rcvlen = recv(mysock, rcvmsg, 100, 0);
>  printf("\n recvlen:%d", rcvlen);
>  printf("\n recvmsg:%s", rcvmsg);
>  strcpy(sndmsg, "THIS is a MSG from CLIENT side"); 
>  send(mysock, sndmsg, strlen(sndmsg),0);
>   
> } 
> close(mysock);
> printf("\n bye \n");
>
>}
>
>
>_______________________________________________
>ds6-devel mailing list
>ds6-devel@deepspace6.net
>http://lists.deepspace6.net/listinfo/ds6-devel
>
>  
>



From guo364 at oki.com  Tue Aug 19 17:49:02 2003
From: guo364 at oki.com (guo zhenglin)
Date: Tue Aug 19 10:49:44 2003
Subject: [ds6-devel] why I MUST set a value to scope_id?
References: <003901c36605$8d453ae0$584911ac@t80c88>
	<3F41DC02.5070904@gsyc.escet.urjc.es>
Message-ID: <004701c3662e$bec8df30$584911ac@t80c88>

thanks very much!!

My linux machine have TWO ethernet adapters.
now I config ip address on one adapter to 3ffe:2400:xxxx,
then from another linux machine ,CAN connect to it
without set  scope_id=3 value ( default scope_id=0)  !!




----- Original Message ----- 
From: "Eva M. Castro" <eva@gsyc.escet.urjc.es>
To: "guo zhenglin" <guo364@oki.com>
Cc: <ds6-devel@deepspace6.net>
Sent: Tuesday, August 19, 2003 4:12 PM
Subject: Re: [ds6-devel] why I MUST set a value to scope_id?


> Suppose you have multiple ethernet adapters, if you use a link local
> address as destination, your host does not know which ethernet adapter
> use to send the packet. It is an ambiguos destination address if you
> dont use the scope identifier in order to specify which ethernet adapter
> should be used.
>
> IMHO you should avoid using link local addresses from applications.
>
> regards,
>
> eva
>
> guo zhenglin wrote:
>
> >1) I use "getaddrinfo" ,
> > then socket(),
> >then connect()
> >it return "Inavlid argument" error
> >
> >2) then I use:
> >
> >((struct sockaddr_in6 *)(res1->ai_addr))->sin6_scope_id =3
> > /* 3 is my eth0 index */
> >
> >then connect() is ok ,and send,recv also ok
> >
> >3) I have test it on linux kernel 2.4.7-10 and 2.4.20
> >   both linux kernel have this problem.
> >
> >4) my client program is following:
> >
> >#include <stdio.h>
> >
> >#include <sys/socket.h>
> >#include <sys/types.h>
> >#include <netdb.h>
> >#include <errno.h>
> >
> >int main(void)
> >{
> > int mysock, myerr;
> > int  i;
> > struct addrinfo hints, *res0, *res1;
> > char rcvmsg[100];
> > char sndmsg[100];
> > int rcvlen;
> >
> > memset(&hints, 0, sizeof(hints));
> > hints.ai_family = PF_UNSPEC;
> > hints.ai_socktype = SOCK_STREAM;
> >
> > myerr = getaddrinfo("fe80::210:5cff:fed7:46c6","5001", &hints, &res0);
> > if(myerr) return -1;
> >
> > printf("\n getaddrinfo success");
> >
> > for(res1 = res0; res1; res1 = res1->ai_next)
> > {
> >  printf("\n--------------------------------");
> >  printf("\n ai_flags:%d", res1->ai_flags);
> >  printf("\n ai_family:%d", res1->ai_family);
> >  printf("\n ai_socktype:%d", res1->ai_socktype);
> >  printf("\n ai_protocol:%d", res1->ai_protocol);
> >  printf("\n ai_addrlen:%d",  res1->ai_addrlen);
> >  printf("\n ai_cannonname:%s", res1->ai_canonname);
> >  printf("\n ai_next:%p",  res1->ai_next);
> >  printf("\n ai_addr:");
> >  for(i=0; i<res1->ai_addrlen; i++)
> >   printf("%02X ",(*((char *)(res1->ai_addr)+i))&0xFF);
> >  printf("\n IP:%d", (res1->ai_family==PF_INET6)? 6:4);
> >
> >  printf("\n------------------------------------");
> >
> >  mysock = socket(res1->ai_family, res1->ai_socktype, res1->ai_protocol);
> >  if(mysock<0){ printf("\n socket fail"); continue;}
> >  printf("\n socket success");
> >
> >  ((struct sockaddr_in6 *)(res1->ai_addr))->sin6_scope_id =3 ;  /* ??? */
> >
> >  printf("\n connecting...\n");
> >  if(connect(mysock, res1->ai_addr, res1->ai_addrlen)<0)
> >  {
> >   perror("\n connect fail");
> >   close(mysock);
> >   continue;
> >  }
> >  printf("\n connect succ");
> >  memset(rcvmsg, 0, 100);
> >  rcvlen = recv(mysock, rcvmsg, 100, 0);
> >  printf("\n recvlen:%d", rcvlen);
> >  printf("\n recvmsg:%s", rcvmsg);
> >  strcpy(sndmsg, "THIS is a MSG from CLIENT side");
> >  send(mysock, sndmsg, strlen(sndmsg),0);
> >
> > }
> > close(mysock);
> > printf("\n bye \n");
> >
> >}
> >
> >
> >_______________________________________________
> >ds6-devel mailing list
> >ds6-devel@deepspace6.net
> >http://lists.deepspace6.net/listinfo/ds6-devel
> >
> >
> >
>
>
>