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/* sockets.c. Rewriten by Andi Kleen. Subject to the GPL. */

/* philb 14/11/98: we now stash the socket file descriptor inside

   the `aftype' structure rather than keeping it in a pile of separate

   variables.  This is necessary so that "ifconfig eth0 broadcast ..."

   issues ioctls to the right socket for the address family in use;

   picking one at random doesn't always work.  */

#include <sys/socket.h>

#include <stdio.h>

#include <unistd.h>

#include "config.h"

#include "sockets.h"

#include "intl.h"

#include "util.h"

#include "net-support.h"

#ifndef EMBED

int skfd = -1;                  /* generic raw socket desc.     */

#endif

int sockets_open(int family)

{

    struct aftype **aft;

    int sfd = -1;

    static int force = -1;

    if (force < 0) {

        force = 0;

        if (kernel_version() < KRELEASE(2, 1, 0))

            force = 1;

        if (access("/proc/net", R_OK))

            force = 1;

    }

    for (aft = aftypes; *aft; aft++) {

        struct aftype *af = *aft;

        int type = SOCK_DGRAM;

        if (af->af == AF_UNSPEC)

            continue;

        if (family && family != af->af)

            continue;

        if (af->fd != -1) {

            sfd = af->fd;

            continue;

        }

        /* Check some /proc file first to not stress kmod */

        if (!family && !force && af->flag_file) {

            if (access(af->flag_file, R_OK))

                continue;

        }

#if HAVE_AFNETROM

        if (af->af == AF_NETROM)

            type = SOCK_SEQPACKET;

#endif

        af->fd = socket(af->af, type, 0);

        if (af->fd >= 0)

            sfd = af->fd;

    }

    if (sfd < 0)

        fprintf(stderr, _("No usable address families found.\n"));

    return sfd;

}