AIX calling WINSOCK during e-mail - normal?


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# 1  
AIX calling WINSOCK during e-mail - normal?

Hey everyone,

I'm completely stumped on this. An AIX machine I'm working on is attempting to send email, but the SMTP connection is failing. I have no idea what this code does or if it should even work. If someone could give me a hand, or a suggestion on what else to use, I would appreciate it.

Code:
retval = connect (the_socket, (struct sockaddr *) & sa_in,
                     sizeof(struct sockaddr_in));

I cannot debug this - when I step into connect() it appears to step-over.
Code:
#if INCL_WINSOCK_API_PROTOTYPES
WINSOCK_API_LINKAGE
int
WSAAPI
connect(
    IN SOCKET s,
    __in_bcount(namelen) const struct sockaddr FAR * name,
    IN int namelen
    );
#endif /* INCL_WINSOCK_API_PROTOTYPES */

# 2  
I would try printing the value of "errno" to find out why the socket didnt connect.
I would also have a look at "the_socket" to make sure it is >= 0.
Then I would also look at the contents of sa_in (which should be a struct sockaddr_in)
My guess from the WINSOCK comment is that this is a ported windows application. As such I believe they can be different in the way that the sa_in is formed (intel is little endian and power is big endian, so for example a missing "htons" on the port or something like that could make a difference on only one platform)

I hope this helps...
This User Gave Thanks to citaylor For This Post:
# 3  
Ok, I'll do that. I know the_socket was 19. Do you know of another way I can use this data to connect to an SMTP server? Gives me an errno of 78

Last edited by ctote; 01-20-2011 at 05:14 PM..
# 4  
None of that winsock stuff matters unless INCL_WINSOCK_API_PROTOTYPES is defined -- it's probably safe to ignore. Windows does in fact have a socket API that vaguely resembles the expected standard, so the code could have been ported as citaylor noted...

After it fails you can try perror("connection failed"); and it should print something like connection failed: no route to host or whatever to stderr.

connect() is usually a system call, not a function, meaning there's nothing happening inside your process to trace during connect() -- it's asleep. Some special instruction or software interrupt has transferred control to the kernel, which will wake it back up when its done.

For more detail on the connect call, try man 2 connect

---------- Post updated at 02:22 PM ---------- Previous update was at 02:06 PM ----------

I found this example for Linux, I think it should at be very close.

Here it is cleaned up and simplified a little.
Code:
    const char *host="smtp.whatever.com";
    short int port=25; // standard smtp port
    int sockfd, n;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    sockfd=socket(AF_INET, SOCK_STREAM, 0);
    server=gethostbyname(host); // look up host's IP address

    // copy the IP address and port into the address structure
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family=AF_INET;
    bcopy(server->h_addr,&serv_addr.sin_addr.s_addr, server->h_length);
    serv_addr.sin_port=htons(port); // htons() puts it in the right byte order
    connect(sockfd, &serv_addr, sizeof(serv_addr));

This User Gave Thanks to Corona688 For This Post:
# 5  
Amazing. Thanks for the help! I'm sure I'll have more questions, but this will definitely get me started!

---------- Post updated at 03:40 PM ---------- Previous update was at 03:30 PM ----------

What does connect() return? Is there somewhere I can view the possible values?
# 6  
Hi.

From the connect(2) man-page:
Code:
RETURN VALUES
     Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and the global inte-
     ger variable errno is set to indicate the error.

This User Gave Thanks to Scott For This Post:
# 7  
Yes, and the perror() command I suggested above checks errno to tell what it should print. errno is a global variable that's set by system calls, so when most any system call returns an error, perror can tell you what it is.
This User Gave Thanks to Corona688 For This Post:
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