TCP socket wrappers

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Detailed Description

The tcp family of functions provide wrappers around connect(2) and listen(2) taking an IP address in the string pointed to by ip and the port number as arguments.

Functions
int	tcp_listen (const char *ip, int port, int backlog)
	listen for incomming connections
int	tcp_connect (const char *ip, int port)
	connect to TCP socket

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Function Documentation

int tcp_listen	(	const char *	ip,
		int	port,
		int	backlog
	)

listen for incomming connections

Parameters:

	ip	IP to listen on
	port	port to listen on
	backlog	queue backlog

Returns:

filedescriptor for the newly allocated socket, -1 on error with errno set

Definition at line 26 of file tcp_listen.c.

References addr_from_str(), addr_htos(), and mem_set().

{
        int fd;
        struct sockaddr_in inaddr;

        if (port < 1)
                return errno = EINVAL, -1;

        mem_set(&inaddr, 0, sizeof(inaddr));
        inaddr.sin_family = AF_INET;
        inaddr.sin_port   = addr_htos(port);

        if (addr_from_str(ip, &inaddr.sin_addr.s_addr, 0) == 0)
                return errno = EINVAL, -1;

        if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
                return -1;

        if (bind(fd, (struct sockaddr *) &inaddr, sizeof(struct sockaddr_in)) == -1) {
                close(fd);
                return -1;
        }

        if (listen(fd, backlog) == -1) {
                close(fd);
                return -1;
        }

        return fd;
}

int tcp_connect	(	const char *	ip,
		int	port
	)

connect to TCP socket

Parameters:

	ip	IP to connect to
	port	port to connect to

Returns:

filedescriptor for the newly allocated connection, -1 on error with errno set

Definition at line 26 of file tcp_connect.c.

References addr_from_str(), and mem_set().

{
        int fd;
        struct sockaddr_in inaddr;

        if (port < 1)
                return errno = EINVAL, -1;

        mem_set(&inaddr, 0, sizeof(inaddr));
        inaddr.sin_family = AF_INET;
        inaddr.sin_port   = htons(port);

        if (addr_from_str(ip, &inaddr.sin_addr.s_addr, 0) == 0)
                return errno = EINVAL, -1;

        if ((fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
                return -1;

        if (connect(fd, (struct sockaddr *) &inaddr, sizeof(struct sockaddr_in)) == -1) {
                close(fd);
                return -1;
        }

        return fd;
}

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