Date: Wed, 11 Sep 2002 14:10:12 -0400 From: "kfl" <kfl@xiphos.ca> To: "freebsd - net" <freebsd-net@FreeBSD.org> Subject: T/TCP and FreeBSD 4.5 Message-ID: <JCEDLMKGMLLELHAJNIHJCEBJDGAA.kfl@xiphos.ca>
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Hi,
I'm having a problem using TCP for transaction in FreeBSd 4.5. Here's a
trace from tcpdump and the code I'm using.
Also, from the dump you can see that rfc1644 is on ;)
Problem: (At 12:41:05.626586, the ack should also ack the data sent with the
SYN.)
Any hints on what could be wrong?
Regards,
Karim Fodil-Lemelin
Xiphos Technologies Inc.
uname -a:
cartman.xiphos.ca 4.5-RELEASE FreeBSD 4.5-RELEASE #0: Mon Jan 28 14:31:56
GMT 2002 murray@builder.freebsdmall.com:/usr/src/sys/compile/GENERIC i386
TRACE:
12:41:05.626087 cartman.xiphos.ca.1029 > ratbert.xiphos.ca.8888: SFP
361776143:361776543(400) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp
145150 0,nop,nop,cc 7> (DF)
12:41:05.626293 ratbert.xiphos.ca.8888 > cartman.xiphos.ca.1029: S
1733428688:1733428688(0) ack 361776144 win 65535 <mss 1460,nop,wscale
1,nop,nop,timestamp 143990 145150,nop,nop,cc 6,nop,nop,ccecho 7>
12:41:05.626451 cartman.xiphos.ca.1029 > ratbert.xiphos.ca.8888: F
361776544:361776544(0) ack 1733428689 win 33120 <nop,nop,timestamp 145150
143990,nop,nop,cc 7> (DF)
12:41:05.626586 ratbert.xiphos.ca.8888 > cartman.xiphos.ca.1029: . ack
361776144 win 33120 <nop,nop,timestamp 143990 145150,nop,nop,cc 6> (DF)
12:41:06.625726 cartman.xiphos.ca.1029 > ratbert.xiphos.ca.8888: FP
361776144:361776544(400) ack 1733428689 win 33120 <nop,nop,timestamp 145250
143990,nop,nop,cc 7> (DF)
12:41:06.625831 ratbert.xiphos.ca.8888 > cartman.xiphos.ca.1029: . ack
361776545 win 32920 <nop,nop,timestamp 144090 145250,nop,nop,cc 6> (DF)
12:41:06.626626 ratbert.xiphos.ca.8888 > cartman.xiphos.ca.1029: FP
1733428689:1733429089(400) ack 361776545 win 33120 <nop,nop,timestamp 144090
145250,nop,nop,cc 6> (DF)
12:41:06.626818 cartman.xiphos.ca.1029 > ratbert.xiphos.ca.8888: . ack
1733429090 win 32920 <nop,nop,timestamp 145250 144090,nop,nop,cc 7> (DF)
INCLUDE FILE:
/* Common includes and defines for UDP, TCP, and T/TCP */
/* clients and servers */
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define REQUEST 400 /* max size of request, in bytes */
#define REPLY 400 /* max size of reply, in bytes */
#define UDP_SERV_PORT 7777 /* UDP server's well-known port */
#define TCP_SERV_PORT 8888 /* TCP server's well-known port */
#define TTCP_SER_PORT 9999 /* T/TCP server's well-known port */
/* Following shortens all the type casts of pointer arguments */
#define SA struct sockaddr *
CLIENT:
int read_stream (int fd, char *ptr, int maxbytes)
{
int nleft, nread;
nleft = maxbytes;
while (nleft > 0) {
if ((nread = read(fd, ptr, nleft)) < 0)
return (nread); /* error return < 0 */
else if (nread == 0)
break; /* EOF, return #bytes read */
nleft -= nread;
ptr += nread;
}
return (maxbytes - nleft);
}
int main (int argc, char *argv[])
{
struct sockaddr_in serv;
struct hostent *host;
char request[REQUEST], reply[REPLY];
uint32_t ipAddr;
int sockfd, n;
int One = 1;
if (argc !=2) {
printf("usage: ttcpcli <IP address or name of server>\n");
exit(0);
}
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
printf("socket error\n");
exit(0);
}
memset(&serv, sizeof(serv), 0);
serv.sin_family = AF_INET;
serv.sin_port = htons(TCP_SERV_PORT);
if ((ipAddr = inet_addr(argv[1])) != -1) {
serv.sin_addr.s_addr = ipAddr;
}
else if ((host = gethostbyname(argv[1])) != NULL) {
bcopy((char *)host->h_addr, (char *)&serv.sin_addr, host->h_length);
}
else {
printf("unknown host\n");
exit(0);
}
/* form request */
strcpy(request, "This is a T/TCP payload");
setsockopt(sockfd, IPPROTO_TCP, TCP_NOPUSH, &One, sizeof (One));
if (sendto (sockfd, request, REQUEST, MSG_EOF, (SA)&serv, sizeof(serv)) !=
REQUEST) {
printf("sendto error\n");
exit(0);
}
if ((n = read_stream(sockfd, reply, REPLY)) < 0) {
printf("read error\n");
exit(0);
}
/* process "n" bytes of reply[] ... */
printf("received:%s\n", reply);
exit(0);
}
SERVER:
int read_stream (int fd, char *ptr, int maxbytes)
{
int nleft, nread;
nleft = maxbytes;
while (nleft > 0) {
if ((nread = read(fd, ptr, nleft)) < 0)
return (nread); /* error return < 0 */
else if (nread == 0)
break; /* EOF, return #bytes read */
nleft -= nread;
ptr += nread;
}
return (maxbytes - nleft);
}
int main ()
{
struct sockaddr_in serv, cli;
char request[REQUEST], reply[REPLY];
int listenfd, sockfd, n, clilen;
if ((listenfd = socket(PF_INET, SOCK_STREAM, 0)) < 0) {
printf("socket error\n");
exit(0);
}
memset(&serv, sizeof(serv), 0);
serv.sin_family = AF_INET;
serv.sin_port = htons(TCP_SERV_PORT);
serv.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(listenfd, (SA)&serv, sizeof(serv)) < 0) {
printf("bind error\n");
exit(0);
}
if (listen(listenfd, SOMAXCONN) < 0) {
printf("listen error\n");
exit(0);
}
for(;;) {
clilen = sizeof(cli);
if ((sockfd = accept(listenfd, (SA)&cli, &clilen)) < 0) {
printf("accept error\n");
exit(0);
}
if ((n = read_stream(sockfd, request, REQUEST)) < 0) {
printf("read error\n");
exit(0);
}
/* process "n" bytes of request[] and create reply[] ... */
printf("recevied:%s\n", request);
strcpy(reply, "Server response");
if (send(sockfd, reply, REPLY, MSG_EOF) != REPLY) {
printf("send error\n");
exit(0);
}
close(sockfd);
}
}
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