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POI run UNIX Network Programming Volume 1(3rd) but how to config the networking environment?
 

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  1. POI run UNIX Network Programming Volume 1(3rd) but how to config the networking environment?
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    <p>I just run the "1.2 A Simple Daytime Client" sample. but under ubuntu, how to config the networking environment? </p> <p>THe sample usage is "solaris % a.out 206.168.112.96", here how should i change the IP here. I am connect to Internet by a LAN. my ip showing by ifconfig is </p> <p><code>inet address: 192.168.0.109</code>, but here when i type <code>a.out 192.168.0.109</code>, it give a info that "connect error: Connection refused", how should i do?</p> <p>Attached is this sample code:</p> <h3>intro/daytimetcpcli.c</h3> <pre><code> #include "unp.h" int main(int argc, char **argv) { int sockfd, n; char recvline[MAXLINE + 1]; struct sockaddr_in servaddr; if (argc != 2) err_quit("usage: a.out &lt;IPaddress&gt;"); if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) &lt; 0) err_sys("socket error"); bzero(&amp;servaddr, sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_port = htons(13); /* daytime server */ if (inet_pton(AF_INET, argv[1], &amp;servaddr.sin_addr) &lt;= 0) err_quit("inet_pton error for %s", argv[1]); if (connect(sockfd, (SA *) &amp;servaddr, sizeof(servaddr)) &lt; 0) err_sys("connect error"); while ( (n = read(sockfd, recvline, MAXLINE)) &gt; 0) { recvline[n] = 0; /* null terminate */ if (fputs(recvline, stdout) == EOF) err_sys("fputs error"); } if (n &lt; 0) err_sys("read error"); exit(0); } </code></pre> <p>Anyone give any advice, i am new to networking progarmming.</p> <p>I just run as one answer provided here:</p> <pre><code>root@ubuntu:/home/jack/dev/practice# ./daytimetcpcli 192.168.0.109 connect error: Connection refused root@ubuntu:/home/jack/dev/practice# </code></pre> <p>it still give the connect error info:</p> <p>I use the netstat to check info.</p> <pre><code> jack@ubuntu:~$ sudo netstat -tlp activate Internet connection (just server) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 localhost:5038 *:* LISTEN 1625/asterisk tcp 0 0 *:cisco-sccp *:* LISTEN 1625/asterisk tcp 0 0 *:http *:* LISTEN 1679/apache2 tcp 0 0 localhost:domain *:* LISTEN 1405/dnsmasq tcp 0 0 localhost:ipp *:* LISTEN 933/cupsd tcp 0 0 localhost:postgresql *:* LISTEN 1076/postgres tcp 0 0 localhost:5946 *:* LISTEN 983/teamviewerd tcp 0 0 *:sip *:* LISTEN 1625/asterisk tcp6 0 0 ip6-localhost:ipp [::]:* LISTEN 933/cupsd </code></pre>
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      1. POI run UNIX Network Programming Volume 1(3rd) but how to config the networking environment?
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    1. COFYI, don't put line numbers in your posted code unless you really need to reference a particular line. Even then a comment and arrow should do the trick. The numbers make it even less likely that anyone is going to try your code. (Not an issue on this post but for the future.)
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      1. POI run UNIX Network Programming Volume 1(3rd) but how to config the networking environment?
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    2. CODid you start the server before the client?
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      1. POI run UNIX Network Programming Volume 1(3rd) but how to config the networking environment?
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    3. COCheck if you can connect to it by using `netcat`. If you get connection refused as well then either your daytime server isn't running or you have firewall blocking it.
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      1. POI run UNIX Network Programming Volume 1(3rd) but how to config the networking environment?
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