Date: Sun, 06 Dec 1998 11:17:22 -0500 From: "Louis A. Mamakos" <louie@TransSys.COM> To: "Jim Flowers" <jflowers@ezo.net> Cc: freebsd-hackers@FreeBSD.ORG, freebsd-net@FreeBSD.ORG Subject: Re: Help with TCP listen() function Message-ID: <199812061617.LAA54526@whizzo.transsys.com> In-Reply-To: Your message of "Sun, 06 Dec 1998 12:10:53 EST." <000d01be213b$625d6eb0$848266ce@crocus.ezo.net> References: <000d01be213b$625d6eb0$848266ce@crocus.ezo.net>
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The problem is that you're not trying to do a TCP "listen" operation; you're
creating a UDP datagram socket, and not a TCP (SOCK_STREAM) type socket. The
listen system call isn't defined to work on datagram sockets because there
are no new connections to be accepted.
This is probably a freebsd-questions mailing list issue for any follow-up.
louie
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> I am trying to port a cable modem (roadrunner) login program written for =
> linux to freebsd 2.2.7 before the Dec 15 deadline. Should have been =
> suspicious when it compiled cleanly without error message.
>
> The program runs up to the point of setting up a TCP socket to request a =
> login sequence using functions:
>
> socket()
> htons()
> bind()
> listen()
>
> and then quits with errnum for "Operation not supported".
>
> The function calls seem to be correctly written and do not return any =
> errors when called (except for listen()).
>
> Is this a correct sequence to establish a passive tcp connection? Is =
> there a better way to do it? Is there a knowledge base for converting =
> linux code to run on FreeBSD? References for the correct way to write =
> code to establish tcp connections?
>
> If a review of the code segment would be helpful, it is brief and =
> follows.
>
> Thanks
> Jim Flowers <jflowers@ezo.net>
>
>
> //------------------------------------------------------------
> // RRListen() - Creates a listen socket for session status and
> // restart requests
> int RRListen(unsigned short *listenport)
> {
> unsigned short port;
> int s;
> struct sockaddr_in saddr;
>
> if ((s =3D socket (AF_INET, SOCK_DGRAM, 0)) < 0) {
> syslog(LOG_ERR, "Error creating listen socket: %m");
> return -1;
> }
>
> // Bind first available port starting at 7770
> port =3D 7770;
> saddr.sin_family =3D AF_INET;
> saddr.sin_addr.s_addr =3D INADDR_ANY;
> do {
> saddr.sin_port =3D htons(port);
> errno =3D 0;
> if (bind(s, (struct sockaddr *) &saddr, sizeof(struct =
> sockaddr_in)) < 0) {
> if (errno !=3D EADDRINUSE) {
> syslog(LOG_ERR, "Error binding listen socket: %m");
> close(s);
> return -1;
> } else {
> port++;
> }
> }
> } while (errno =3D=3D EADDRINUSE);
>
> if (listen(s, 1) < 0) {
> syslog(LOG_ERR, "Error listening on socket: %m");
> close(s);
> return -1;
> }
>
> *listenport =3D port;
> syslog(LOG_INFO, "Established listener on port: %i", port);
> return s;
> )
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> <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
> <HTML>
> <HEAD>
>
> <META content=3Dtext/html;charset=3Diso-8859-1 =
> http-equiv=3DContent-Type>
> <META content=3D'"MSHTML 4.72.2106.6"' name=3DGENERATOR>
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> <BODY bgColor=3D#ffffff>
> <DIV><FONT color=3D#000000 size=3D2>I am trying to port a cable modem =
> (roadrunner)=20
> login program written for linux to freebsd 2.2.7 before the Dec 15=20
> deadline. Should have been suspicious when it compiled cleanly =
> without=20
> error message.</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>The program runs up to the point of setting up a TCP =
> socket to=20
> request a login sequence using functions:</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>socket()</FONT></DIV>
> <DIV><FONT size=3D2>htons()</FONT></DIV>
> <DIV><FONT size=3D2>bind()</FONT></DIV>
> <DIV><FONT size=3D2>listen()</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>and then quits with errnum for "Operation not=20
> supported".</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>The function calls seem to be correctly written and =
> do not=20
> return any errors when called (except for listen()).</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>Is this a correct sequence to establish a passive =
> tcp=20
> connection? Is there a better way to do it? Is there a knowledge =
> base for=20
> converting linux code </FONT><FONT size=3D2>to run on FreeBSD? =
> References=20
> for the correct way to write code to establish tcp =
> connections?</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>If a review of the code segment would be helpful, it =
> is brief=20
> and follows.</FONT></DIV>
> <DIV><FONT size=3D2></FONT> </DIV>
> <DIV><FONT size=3D2>Thanks</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2>Jim Flowers <<A=20
> href=3D"mailto:jflowers@ezo.net">jflowers@ezo.net</A>></FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV> </DIV>
> <DIV><FONT color=3D#000000=20
> size=3D2>//------------------------------------------------------------<B=
> R>//=20
> RRListen() - Creates a listen socket for session status=20
> and<BR>// &nbs=
> p; =20
> restart requests<BR>int RRListen(unsigned short=20
> *listenport)<BR>{<BR> unsigned short port;<BR> int=20
> s;<BR> struct sockaddr_in saddr;</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT color=3D#000000 size=3D2> if ((s =3D socket =
> (AF_INET,=20
> SOCK_DGRAM, 0)) < 0) {<BR> =
> syslog(LOG_ERR,=20
> "Error creating listen socket: =
> %m");<BR> =20
> return -1;<BR> }</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT color=3D#000000 size=3D2> // Bind first available port =
> starting at=20
> 7770<BR> port =3D 7770;<BR> saddr.sin_family =3D =
>
> AF_INET;<BR> saddr.sin_addr.s_addr =3D =
> INADDR_ANY;<BR> do=20
> {<BR> saddr.sin_port =3D=20
> htons(port);<BR> errno =3D=20
> 0;<BR> if (bind(s, (struct sockaddr *) =
> &saddr,=20
> sizeof(struct sockaddr_in)) < 0) {<BR> if (errno !=3D =
> EADDRINUSE)=20
> {<BR> =20
> syslog(LOG_ERR, "Error binding listen socket:=20
> %m");<BR>  =
> ;=20
> close(s);<BR> =
> return=20
> -1;<BR> } else=20
> {<BR> =20
> port++;<BR> =20
> }<BR> }<BR> } while (errno =3D=3D=20
> EADDRINUSE);</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT color=3D#000000 size=3D2> if (listen(s, 1) < 0)=20
> {<BR> syslog(LOG_ERR, "Error listening on =
> socket:=20
> %m");<BR> =
> close(s);<BR> =20
> return -1;<BR> }</FONT></DIV>
> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
> <DIV><FONT color=3D#000000 size=3D2> *listenport =3D =
> port;<BR> =20
> syslog(LOG_INFO, "Established listener on port: %i",=20
> port);<BR> return s;<BR>)</FONT></DIV>
> <DIV><FONT color=3D#000000=20
> size=3D2>----------------------------------------------------------------=
> ---------------</FONT></DIV></BODY></HTML>
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