Date: Sun, 6 Dec 1998 12:10:53 -0500 From: "Jim Flowers" <jflowers@ezo.net> To: <freebsd-hackers@FreeBSD.ORG>, <freebsd-net@FreeBSD.ORG> Subject: Help with TCP listen() function Message-ID: <000d01be213b$625d6eb0$848266ce@crocus.ezo.net>
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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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<HEAD>
<META content=3Dtext/html;charset=3Diso-8859-1 =
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<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>----------------------------------------------------------------=
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