connect.c

来自「minix操作系统最新版本（3.1.1）的源代码」· C语言 代码 · 共 139 行

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <net/gen/in.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <net/gen/udp.h>
#include <net/gen/udp_io.h>

#define DEBUG 0

static int _tcp_connect(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_tcpconf_t *tcpconfp);
static int _udp_connect(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_udpopt_t *udpoptp);

int connect(int socket, const struct sockaddr *address,
	socklen_t address_len)
{
	int r;
	nwio_tcpconf_t tcpconf;
	nwio_udpopt_t udpopt;

	r= ioctl(socket, NWIOGTCPCONF, &tcpconf);
	if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
	{
		if (r == -1)
		{
			/* Bad file descriptor */
			return -1;
		}
		return _tcp_connect(socket, address, address_len, &tcpconf);
	}

	r= ioctl(socket, NWIOGUDPOPT, &udpopt);
	if (r != -1 || (errno != ENOTTY && errno != EBADIOCTL))
	{
		if (r == -1)
		{
			/* Bad file descriptor */
			return -1;
		}
		return _udp_connect(socket, address, address_len, &udpopt);
	}
#if DEBUG
	fprintf(stderr, "connect: not implemented for fd %d\n", socket);
#endif
	errno= ENOSYS;
	return -1;
}

static int _tcp_connect(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_tcpconf_t *tcpconfp)
{
	int r;
	struct sockaddr_in *sinp;
	nwio_tcpconf_t tcpconf;
	nwio_tcpcl_t tcpcl;

	if (address_len != sizeof(*sinp))
	{
		errno= EINVAL;
		return -1;
	}
	sinp= (struct sockaddr_in *)address;
	if (sinp->sin_family != AF_INET)
	{
		errno= EINVAL;
		return -1;
	}
	tcpconf.nwtc_flags= NWTC_SET_RA | NWTC_SET_RP;
	if ((tcpconfp->nwtc_flags & NWTC_LOCPORT_MASK) == NWTC_LP_UNSET)
		tcpconf.nwtc_flags |= NWTC_LP_SEL;
	tcpconf.nwtc_remaddr= sinp->sin_addr.s_addr;
	tcpconf.nwtc_remport= sinp->sin_port;

	if (ioctl(socket, NWIOSTCPCONF, &tcpconf) == -1)
        {
		/* Ignore EISCONN error. The NWIOTCPCONN ioctl will get the
		 * right error.
		 */
		if (errno != EISCONN)
			return -1;
	}

	tcpcl.nwtcl_flags= TCF_DEFAULT;

	r= fcntl(socket, F_GETFL);
	if (r == 1)
		return -1;
	if (r & O_NONBLOCK)
		tcpcl.nwtcl_flags |= TCF_ASYNCH;

	r= ioctl(socket, NWIOTCPCONN, &tcpcl);
	return r;
}

static int _udp_connect(int socket, const struct sockaddr *address,
	socklen_t address_len, nwio_udpopt_t *udpoptp)
{
	int r;
	struct sockaddr_in *sinp;
	nwio_udpopt_t udpopt;

	if (address == NULL)
	{
		/* Unset remote address */
		udpopt.nwuo_flags= NWUO_RP_ANY | NWUO_RA_ANY;

		r= ioctl(socket, NWIOSUDPOPT, &udpopt);
		return r;
	}

	if (address_len != sizeof(*sinp))
	{
		errno= EINVAL;
		return -1;
	}
	sinp= (struct sockaddr_in *)address;
	if (sinp->sin_family != AF_INET)
	{
		errno= EINVAL;
		return -1;
	}
	udpopt.nwuo_flags= NWUO_RP_SET | NWUO_RA_SET;
	if ((udpoptp->nwuo_flags & NWUO_LOCPORT_MASK) == NWUO_LP_ANY)
		udpopt.nwuo_flags |= NWUO_LP_SEL;
	udpopt.nwuo_remaddr= sinp->sin_addr.s_addr;
	udpopt.nwuo_remport= sinp->sin_port;

	r= ioctl(socket, NWIOSUDPOPT, &udpopt);
	return r;
}