I have uploaded a DCCP socket programming library to support DCCP userland
applications on
http://www.erg.abdn.ac.uk/users/gerrit/dccp/apps
It takes care of many low-level details, such as making getaddrinfo() work for
DCCP v4 and v6,
assigning, parsing, and decoding service codes; use of partial checksums and
more.
It comes with 9 example client/server programs:
* Echo / Discard / Chargen / Time / Daytime
* Hello world example with SO_LINGER and normal
* Steven's sock program (see below) for v4/v6 DCCP/UDP-Lite
* ttcp for v4/v6 DCCP/UDP-Lite
All applications and the library have been tested to work on both i386 and
sparc64 (little/big endian).
Some are useful for DCCP testing - the Chargen for example uses random buffer
sizes which are useful
for stress-testing.
The library provides many low-level routines which may also be of use outside
the library,
i.e. it is not necessary to build all applications specifically with such a
library.
Documentation is at
http://www.erg.abdn.ac.uk/users/gerrit/dccp/apps/dccplib.html
It can be downloaded from
http://www.erg.abdn.ac.uk/users/gerrit/dccp/apps/dccp_applications_lib.tar.gz
An example live transcript of Stevens' sock program linked against the library:
[EMAIL PROTECTED] $ sock -dSC:KOTZ,SC=xC0DE -is 2000
IPv4/IPv6 DCCP socket listening on ::#2000
DCCP service codes: SC:KOTZ, SC=xC0DE
accept from from ::ffff:139.133.209.103#45108
buffer read #1: 1024 bytes
... (998 lines deleted)
buffer read #1000: 1024 bytes
Received a total of 1024000 bytes in 1000 buffer reads.
... and here is a fully functional Daytime IPv4 / IPv6 client for DCCP:
int main(int argc, char **argv)
{
char buf[BUFSIZ];
int sockfd, cnt;
if (argc != 2)
err_quit("%s: Need a `host' argument", *argv);
sockfd = dccp_connect_simple(argv[1], "SC:DTIM");
if ((cnt = read(sockfd, buf, sizeof(buf))) < 0)
err_sys("read error");
return write(2, buf, cnt) > 0;
}
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