Unable to Accept TCP Connection

Unable to Accept TCP Connection

[R0b0t1]

The following never prints "Hello, world!"


struct sboot_state {
    struct sockaddr_in haddr;
    struct sockaddr caddr;
    socklen_t clen;
    int sfd, cfd;
} state = { 0 };

state.haddr.sin_family = AF_INET;
state.haddr.sin_port = 2200;
state.haddr.sin_addr.s_addr = INADDR_ANY;

state.sfd = socket(AF_INET, SOCK_STREAM, 0);
if (state.sfd < 0) {
  perror("socket");
  exit(1);
}

if (bind(state.sfd, (struct sockaddr *)&state.haddr,
  sizeof(state.haddr)) < 0) {
  perror("bind");
  exit(1);
}

listen(state.sfd, 5);
state.clen = sizeof(state.caddr);
state.cfd = accept(state.sfd, (struct sockaddr *)&state.caddr,
  &state.clen);
if (state.cfd < 0) {
  perror("accept");
  exit(1);
}

printf("Hello, world!\n");


The program was allowed through the Windows firewall. Any hints?
Attempting to connect with netcat immediately fails.

Cheers,
     R0b0t1

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Re: Unable to Accept TCP Connection

[Mark Geisert]

R0b0t1 wrote:
> The following never prints "Hello, world!"
>
>
> struct sboot_state {
>     struct sockaddr_in haddr;
>     struct sockaddr caddr;
>     socklen_t clen;
>     int sfd, cfd;
> } state = { 0 };
>
> state.haddr.sin_family = AF_INET;
> state.haddr.sin_port = 2200;

You can use the Windows 'netstat' to see listening connections.  See if your app 
shows up on port 2200.  But I suspect you need an htons(2200) on the assignment 
to sin_port.

..mark


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Re: Unable to Accept TCP Connection

[R0b0t1]

On Sat, Apr 21, 2018 at 6:20 PM, Mark Geisert <mark@maxrnd.com> wrote:
> R0b0t1 wrote:
>>
>> The following never prints "Hello, world!"
>>
>>
>> struct sboot_state {
>>     struct sockaddr_in haddr;
>>     struct sockaddr caddr;
>>     socklen_t clen;
>>     int sfd, cfd;
>> } state = { 0 };
>>
>> state.haddr.sin_family = AF_INET;
>> state.haddr.sin_port = 2200;
>
>
> You can use the Windows 'netstat' to see listening connections.  See if your
> app shows up on port 2200.  But I suspect you need an htons(2200) on the
> assignment to sin_port.
>

Thanks, I thought something was missing. Wasn't sure what.

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