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[people/ms/strongswan.git] / src / pluto / server.c

/* get-next-event loop
 * Copyright (C) 1997 Angelos D. Keromytis.
 * Copyright (C) 1998-2002  D. Hugh Redelmeier.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * RCSID $Id: server.c,v 1.9 2005/09/09 14:15:35 as Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#ifdef SOLARIS
# include <sys/sockio.h>        /* for Solaris 2.6: defines SIOCGIFCONF */
#endif
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/time.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <resolv.h>
#include <arpa/nameser.h>       /* missing from <resolv.h> on old systems */
#include <sys/queue.h>

#include <freeswan.h>

#include "constants.h"
#include "defs.h"
#include "state.h"
#include "connections.h"
#include "kernel.h"
#include "log.h"
#include "server.h"
#include "timer.h"
#include "packet.h"
#include "demux.h"  /* needs packet.h */
#include "rcv_whack.h"
#include "keys.h"
#include "adns.h"       /* needs <resolv.h> */
#include "dnskey.h"     /* needs keys.h and adns.h */
#include "whack.h"      /* for RC_LOG_SERIOUS */

#include <pfkeyv2.h>
#include <pfkey.h>
#include "kameipsec.h"

#ifdef NAT_TRAVERSAL
#include "nat_traversal.h"
#endif

/*
 *  Server main loop and socket initialization routines.
 */

static const int on = TRUE;     /* by-reference parameter; constant, we hope */

/* control (whack) socket */
int ctl_fd = NULL_FD;   /* file descriptor of control (whack) socket */
struct sockaddr_un ctl_addr = { AF_UNIX, DEFAULT_CTLBASE CTL_SUFFIX };

/* info (showpolicy) socket */
int policy_fd = NULL_FD;
struct sockaddr_un info_addr= { AF_UNIX, DEFAULT_CTLBASE INFO_SUFFIX };

/* Initialize the control socket.
 * Note: this is called very early, so little infrastructure is available.
 * It is important that the socket is created before the original
 * Pluto process returns.
 */
err_t
init_ctl_socket(void)
{
    err_t failed = NULL;

    delete_ctl_socket();        /* preventative medicine */
    ctl_fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (ctl_fd == -1)
        failed = "create";
    else if (fcntl(ctl_fd, F_SETFD, FD_CLOEXEC) == -1)
        failed = "fcntl FD+CLOEXEC";
    else if (setsockopt(ctl_fd, SOL_SOCKET, SO_REUSEADDR, (const void *)&on, sizeof(on)) < 0)
        failed = "setsockopt";
    else
    {
        /* to keep control socket secure, use umask */
        mode_t ou = umask(~S_IRWXU);

        if (bind(ctl_fd, (struct sockaddr *)&ctl_addr
        , offsetof(struct sockaddr_un, sun_path) + strlen(ctl_addr.sun_path)) < 0)
            failed = "bind";
        umask(ou);
    }

    /* 5 is a haphazardly chosen limit for the backlog.
     * Rumour has it that this is the max on BSD systems.
     */
    if (failed == NULL && listen(ctl_fd, 5) < 0)
        failed = "listen() on";

    return failed == NULL? NULL : builddiag("could not %s control socket: %d %s"
            , failed, errno, strerror(errno));
}

void
delete_ctl_socket(void)
{
    /* Is noting failure useful?  Not when used as preventative medicine. */
    unlink(ctl_addr.sun_path);
}

#ifdef IPSECPOLICY
/* Initialize the info socket.
 */
err_t
init_info_socket(void)
{
    err_t failed = NULL;

    delete_info_socket();       /* preventative medicine */
    info_fd = socket(AF_UNIX, SOCK_STREAM, 0);
    if (info_fd == -1)
        failed = "create";
    else if (fcntl(info_fd, F_SETFD, FD_CLOEXEC) == -1)
        failed = "fcntl FD+CLOEXEC";
    else if (setsockopt(info_fd, SOL_SOCKET, SO_REUSEADDR, (const void *)&on, sizeof(on)) < 0)
        failed = "setsockopt";
    else
    {
        /* this socket should be openable by all proceses */
        mode_t ou = umask(0);

        if (bind(info_fd, (struct sockaddr *)&info_addr
        , offsetof(struct sockaddr_un, sun_path) + strlen(info_addr.sun_path)) < 0)
            failed = "bind";
        umask(ou);
    }

    /* 64 might be big enough, and the system may limit us anyway.
     */
    if (failed == NULL && listen(info_fd, 64) < 0)
        failed = "listen() on";

    return failed == NULL? NULL : builddiag("could not %s info socket: %d %s"
            , failed, errno, strerror(errno));
}

void
delete_info_socket(void)
{
    unlink(info_addr.sun_path);
}
#endif /* IPSECPOLICY */


bool listening = FALSE; /* should we pay attention to IKE messages? */

struct iface *interfaces = NULL;        /* public interfaces */

/* Initialize the interface sockets. */

static void
mark_ifaces_dead(void)
{
    struct iface *p;

    for (p = interfaces; p != NULL; p = p->next)
        p->change = IFN_DELETE;
}

static void
free_dead_ifaces(void)
{
    struct iface *p;
    bool some_dead = FALSE
        , some_new = FALSE;

    for (p = interfaces; p != NULL; p = p->next)
    {
        if (p->change == IFN_DELETE)
        {
            plog("shutting down interface %s/%s %s"
                , p->vname, p->rname, ip_str(&p->addr));
            some_dead = TRUE;
        }
        else if (p->change == IFN_ADD)
        {
            some_new = TRUE;
        }
    }

    if (some_dead)
    {
        struct iface **pp;

        release_dead_interfaces();
        for (pp = &interfaces; (p = *pp) != NULL; )
        {
            if (p->change == IFN_DELETE)
            {
                *pp = p->next;  /* advance *pp */
                pfree(p->vname);
                pfree(p->rname);
                close(p->fd);
                pfree(p);
            }
            else
            {
                pp = &p->next;  /* advance pp */
            }
        }
    }

    /* this must be done after the release_dead_interfaces
     * in case some to the newly unoriented connections can
     * become oriented here.
     */
    if (some_dead || some_new)
        check_orientations();
}

void
free_ifaces(void)
{
    mark_ifaces_dead();
    free_dead_ifaces();
}

struct raw_iface {
    ip_address addr;
    char name[IFNAMSIZ + 20];   /* what would be a safe size? */
    struct raw_iface *next;
};

/* Called to handle --interface <ifname>
 * Semantics: if specified, only these (real) interfaces are considered.
 */
static const char *pluto_ifn[10];
static int pluto_ifn_roof = 0;

bool
use_interface(const char *rifn)
{
    if (pluto_ifn_roof >= (int)elemsof(pluto_ifn))
    {
        return FALSE;
    }
    else
    {
        pluto_ifn[pluto_ifn_roof++] = rifn;
        return TRUE;
    }
}

#ifndef IPSECDEVPREFIX
# define IPSECDEVPREFIX "ipsec"
#endif

static struct raw_iface *
find_raw_ifaces4(void)
{
    int j;      /* index into buf */
    struct ifconf ifconf;
    struct ifreq buf[300];      /* for list of interfaces -- arbitrary limit */
    struct raw_iface *rifaces = NULL;
    int master_sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);    /* Get a UDP socket */

    /* get list of interfaces with assigned IPv4 addresses from system */

    if (master_sock == -1)
        exit_log_errno((e, "socket() failed in find_raw_ifaces4()"));

    if (setsockopt(master_sock, SOL_SOCKET, SO_REUSEADDR
    , (const void *)&on, sizeof(on)) < 0)
        exit_log_errno((e, "setsockopt() in find_raw_ifaces4()"));

    /* bind the socket */
    {
        ip_address any;

        happy(anyaddr(AF_INET, &any));
        setportof(htons(pluto_port), &any);
        if (bind(master_sock, sockaddrof(&any), sockaddrlenof(&any)) < 0)
            exit_log_errno((e, "bind() failed in find_raw_ifaces4()"));
    }

    /* Get local interfaces.  See netdevice(7). */
    ifconf.ifc_len = sizeof(buf);
    ifconf.ifc_buf = (void *) buf;
    zero(buf);

    if (ioctl(master_sock, SIOCGIFCONF, &ifconf) == -1)
        exit_log_errno((e, "ioctl(SIOCGIFCONF) in find_raw_ifaces4()"));

    /* Add an entry to rifaces for each interesting interface. */
    for (j = 0; (j+1) * sizeof(*buf) <= (size_t)ifconf.ifc_len; j++)
    {
        struct raw_iface ri;
        const struct sockaddr_in *rs = (struct sockaddr_in *) &buf[j].ifr_addr;
        struct ifreq auxinfo;

        /* ignore all but AF_INET interfaces */
        if (rs->sin_family != AF_INET)
            continue;   /* not interesting */

        /* build a NUL-terminated copy of the rname field */
        memcpy(ri.name, buf[j].ifr_name, IFNAMSIZ);
        ri.name[IFNAMSIZ] = '\0';

        /* ignore if our interface names were specified, and this isn't one */
        if (pluto_ifn_roof != 0)
        {
            int i;

            for (i = 0; i != pluto_ifn_roof; i++)
                if (streq(ri.name, pluto_ifn[i]))
                    break;
            if (i == pluto_ifn_roof)
                continue;       /* not found -- skip */
        }

        /* Find out stuff about this interface.  See netdevice(7). */
        zero(&auxinfo); /* paranoia */
        memcpy(auxinfo.ifr_name, buf[j].ifr_name, IFNAMSIZ);
        if (ioctl(master_sock, SIOCGIFFLAGS, &auxinfo) == -1)
            exit_log_errno((e
                , "ioctl(SIOCGIFFLAGS) for %s in find_raw_ifaces4()"
                , ri.name));
        if (!(auxinfo.ifr_flags & IFF_UP))
            continue;   /* ignore an interface that isn't UP */

        /* ignore unconfigured interfaces */
        if (rs->sin_addr.s_addr == 0)
            continue;

        happy(initaddr((const void *)&rs->sin_addr, sizeof(struct in_addr)
            , AF_INET, &ri.addr));

        DBG(DBG_CONTROL, DBG_log("found %s with address %s"
            , ri.name, ip_str(&ri.addr)));
        ri.next = rifaces;
        rifaces = clone_thing(ri, "struct raw_iface");
    }

    close(master_sock);

    return rifaces;
}

static struct raw_iface *
find_raw_ifaces6(void)
{

    /* Get list of interfaces with IPv6 addresses from system from /proc/net/if_inet6).
     *
     * Documentation of format?
     * RTFS: linux-2.2.16/net/ipv6/addrconf.c:iface_proc_info()
     *       linux-2.4.9-13/net/ipv6/addrconf.c:iface_proc_info()
     *
     * Sample from Gerhard's laptop:
     *  00000000000000000000000000000001 01 80 10 80       lo
     *  30490009000000000000000000010002 02 40 00 80   ipsec0
     *  30490009000000000000000000010002 07 40 00 80     eth0
     *  fe80000000000000025004fffefd5484 02 0a 20 80   ipsec0
     *  fe80000000000000025004fffefd5484 07 0a 20 80     eth0
     *
     * Each line contains:
     * - IPv6 address: 16 bytes, in hex, no punctuation
     * - ifindex: 1 byte, in hex
     * - prefix_len: 1 byte, in hex
     * - scope (e.g. global, link local): 1 byte, in hex
     * - flags: 1 byte, in hex
     * - device name: string, followed by '\n'
     */
    struct raw_iface *rifaces = NULL;
    static const char proc_name[] = "/proc/net/if_inet6";
    FILE *proc_sock = fopen(proc_name, "r");

    if (proc_sock == NULL)
    {
        DBG(DBG_CONTROL, DBG_log("could not open %s", proc_name));
    }
    else
    {
        for (;;)
        {
            struct raw_iface ri;
            unsigned short xb[8];       /* IPv6 address as 8 16-bit chunks */
            char sb[8*5];       /* IPv6 address as string-with-colons */
            unsigned int if_idx;        /* proc field, not used */
            unsigned int plen;  /* proc field, not used */
            unsigned int scope; /* proc field, used to exclude link-local */
            unsigned int dad_status;    /* proc field, not used */
            /* ??? I hate and distrust scanf -- DHR */
            int r = fscanf(proc_sock
                , "%4hx%4hx%4hx%4hx%4hx%4hx%4hx%4hx"
                  " %02x %02x %02x %02x %20s\n"
                , xb+0, xb+1, xb+2, xb+3, xb+4, xb+5, xb+6, xb+7
                , &if_idx, &plen, &scope, &dad_status, ri.name);

            /* ??? we should diagnose any problems */
            if (r != 13)
                break;

            /* ignore addresses with link local scope.
             * From linux-2.4.9-13/include/net/ipv6.h:
             * IPV6_ADDR_LINKLOCAL      0x0020U
             * IPV6_ADDR_SCOPE_MASK     0x00f0U
             */
            if ((scope & 0x00f0U) == 0x0020U)
                continue;

            snprintf(sb, sizeof(sb)
                , "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
                , xb[0], xb[1], xb[2], xb[3], xb[4], xb[5], xb[6], xb[7]);

            happy(ttoaddr(sb, 0, AF_INET6, &ri.addr));

            if (!isunspecaddr(&ri.addr))
            {
                DBG(DBG_CONTROL
                    , DBG_log("found %s with address %s"
                        , ri.name, sb));
                ri.next = rifaces;
                rifaces = clone_thing(ri, "struct raw_iface");
            }
        }
        fclose(proc_sock);
    }

    return rifaces;
}

#if 1
static int
create_socket(struct raw_iface *ifp, const char *v_name, int port)
{
    int fd = socket(addrtypeof(&ifp->addr), SOCK_DGRAM, IPPROTO_UDP);
    int fcntl_flags;

    if (fd < 0)
    {
        log_errno((e, "socket() in process_raw_ifaces()"));
        return -1;
    }

#if 1
    /* Set socket Nonblocking */
    if ((fcntl_flags=fcntl(fd, F_GETFL)) >= 0) {
        if (!(fcntl_flags & O_NONBLOCK)) {
            fcntl_flags |= O_NONBLOCK;
            fcntl(fd, F_SETFL, fcntl_flags);
        }
    }
#endif

    if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
    {
        log_errno((e, "fcntl(,, FD_CLOEXEC) in process_raw_ifaces()"));
        close(fd);
        return -1;
    }

    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR
    , (const void *)&on, sizeof(on)) < 0)
    {
        log_errno((e, "setsockopt SO_REUSEADDR in process_raw_ifaces()"));
        close(fd);
        return -1;
    }

    /* To improve error reporting.  See ip(7). */
#if defined(IP_RECVERR) && defined(MSG_ERRQUEUE)
    if (setsockopt(fd, SOL_IP, IP_RECVERR
    , (const void *)&on, sizeof(on)) < 0)
    {
        log_errno((e, "setsockopt IP_RECVERR in process_raw_ifaces()"));
        close(fd);
        return -1;
    }
#endif

    /* With IPv6, there is no fragmentation after
     * it leaves our interface.  PMTU discovery
     * is mandatory but doesn't work well with IKE (why?).
     * So we must set the IPV6_USE_MIN_MTU option.
     * See draft-ietf-ipngwg-rfc2292bis-01.txt 11.1
     */
#ifdef IPV6_USE_MIN_MTU /* YUCK: not always defined */
    if (addrtypeof(&ifp->addr) == AF_INET6
    && setsockopt(fd, SOL_SOCKET, IPV6_USE_MIN_MTU
      , (const void *)&on, sizeof(on)) < 0)
    {
        log_errno((e, "setsockopt IPV6_USE_MIN_MTU in process_raw_ifaces()"));
        close(fd);
        return -1;
    }
#endif

#if defined(linux) && defined(KERNEL26_SUPPORT)
    if (!no_klips && kernel_ops->type == KERNEL_TYPE_LINUX)
    {
        struct sadb_x_policy policy;
        int level, opt;

        policy.sadb_x_policy_len = sizeof(policy) / IPSEC_PFKEYv2_ALIGN;
        policy.sadb_x_policy_exttype = SADB_X_EXT_POLICY;
        policy.sadb_x_policy_type = IPSEC_POLICY_BYPASS;
        policy.sadb_x_policy_dir = IPSEC_DIR_INBOUND;
        policy.sadb_x_policy_reserved = 0;
        policy.sadb_x_policy_id = 0;
        policy.sadb_x_policy_reserved2 = 0;

        if (addrtypeof(&ifp->addr) == AF_INET6)
        {
            level = IPPROTO_IPV6;
            opt = IPV6_IPSEC_POLICY;
        }
        else
        {
            level = IPPROTO_IP;
            opt = IP_IPSEC_POLICY;
        }

        if (setsockopt(fd, level, opt
          , &policy, sizeof(policy)) < 0)
        {
            log_errno((e, "setsockopt IPSEC_POLICY in process_raw_ifaces()"));
            close(fd);
            return -1;
        }

        policy.sadb_x_policy_dir = IPSEC_DIR_OUTBOUND;

        if (setsockopt(fd, level, opt
          , &policy, sizeof(policy)) < 0)
        {
            log_errno((e, "setsockopt IPSEC_POLICY in process_raw_ifaces()"));
            close(fd);
            return -1;
        }
    }
#endif

    setportof(htons(port), &ifp->addr);
    if (bind(fd, sockaddrof(&ifp->addr), sockaddrlenof(&ifp->addr)) < 0)
    {
        log_errno((e, "bind() for %s/%s %s:%u in process_raw_ifaces()"
            , ifp->name, v_name
            , ip_str(&ifp->addr), (unsigned) port));
        close(fd);
        return -1;
    }
    setportof(htons(pluto_port), &ifp->addr);
    return fd;
}
#endif

static void
process_raw_ifaces(struct raw_iface *rifaces)
{
    struct raw_iface *ifp;

    /* Find all virtual/real interface pairs.
     * For each real interface...
     */
    for (ifp = rifaces; ifp != NULL; ifp = ifp->next)
    {
        struct raw_iface *v = NULL;     /* matching ipsecX interface */
        struct raw_iface fake_v;
        bool after = FALSE; /* has vfp passed ifp on the list? */
        bool bad = FALSE;
        struct raw_iface *vfp;

        /* ignore if virtual (ipsec*) interface */
        if (strncmp(ifp->name, IPSECDEVPREFIX, sizeof(IPSECDEVPREFIX)-1) == 0)
            continue;

        for (vfp = rifaces; vfp != NULL; vfp = vfp->next)
        {
            if (vfp == ifp)
            {
                after = TRUE;
            }
            else if (sameaddr(&ifp->addr, &vfp->addr))
            {
                /* Different entries with matching IP addresses.
                 * Many interesting cases.
                 */
                if (strncmp(vfp->name, IPSECDEVPREFIX, sizeof(IPSECDEVPREFIX)-1) == 0)
                {
                    if (v != NULL  && !streq(v->name, vfp->name))
                    {
                        loglog(RC_LOG_SERIOUS
                            , "ipsec interfaces %s and %s share same address %s"
                            , v->name, vfp->name, ip_str(&ifp->addr));
                        bad = TRUE;
                    }
                    else
                    {
                        v = vfp;        /* current winner */
                    }
                }
                else
                {
                    /* ugh: a second real interface with the same IP address
                     * "after" allows us to avoid double reporting.
                     */
#if defined(linux) && defined(KERNEL26_SUPPORT)
                    if (!no_klips && kernel_ops->type == KERNEL_TYPE_LINUX)
                    {
                        if (after)
                        {
                            bad = TRUE;
                            break;
                        }
                        continue;
                    }
#endif
                    if (after)
                    {
                        loglog(RC_LOG_SERIOUS
                            , "IP interfaces %s and %s share address %s!"
                            , ifp->name, vfp->name, ip_str(&ifp->addr));
                    }
                    bad = TRUE;
                }
            }
        }

        if (bad)
            continue;

#if defined(linux) && defined(KERNEL26_SUPPORT)
        if (!no_klips && kernel_ops->type == KERNEL_TYPE_LINUX)
        {
            v = ifp;
            goto add_entry;
        }
#endif

        /* what if we didn't find a virtual interface? */
        if (v == NULL)
        {
            if (no_klips)
            {
                /* kludge for testing: invent a virtual device */
                static const char fvp[] = "virtual";
                fake_v = *ifp;
                passert(sizeof(fake_v.name) > sizeof(fvp));
                strcpy(fake_v.name, fvp);
                addrtot(&ifp->addr, 0, fake_v.name + sizeof(fvp) - 1
                    , sizeof(fake_v.name) - (sizeof(fvp) - 1));
                v = &fake_v;
            }
            else
            {
                DBG(DBG_CONTROL,
                        DBG_log("IP interface %s %s has no matching ipsec* interface -- ignored"
                            , ifp->name, ip_str(&ifp->addr)));
                continue;
            }
        }

        /* We've got all we need; see if this is a new thing:
         * search old interfaces list.
         */
#if defined(linux) && defined(KERNEL26_SUPPORT)
add_entry:
#endif
        {
            struct iface **p = &interfaces;

            for (;;)
            {
                struct iface *q = *p;

                /* search is over if at end of list */
                if (q == NULL)
                {
                    /* matches nothing -- create a new entry */
                    int fd = create_socket(ifp, v->name, pluto_port);

                    if (fd < 0)
                        break;

#ifdef NAT_TRAVERSAL
                    if (nat_traversal_support_non_ike
                    && addrtypeof(&ifp->addr) == AF_INET)
                    {
                        nat_traversal_espinudp_socket(fd, ESPINUDP_WITH_NON_IKE);
                    }
#endif

                    q = alloc_thing(struct iface, "struct iface");
                    q->rname = clone_str(ifp->name, "real device name");
                    q->vname = clone_str(v->name, "virtual device name");
                    q->addr = ifp->addr;
                    q->fd = fd;
                    q->next = interfaces;
                    q->change = IFN_ADD;
                    interfaces = q;
                    plog("adding interface %s/%s %s:%d"
                        , q->vname, q->rname, ip_str(&q->addr), pluto_port);
#ifdef NAT_TRAVERSAL
                    if (nat_traversal_support_port_floating
                    && addrtypeof(&ifp->addr) == AF_INET)
                    {
                        fd = create_socket(ifp, v->name, NAT_T_IKE_FLOAT_PORT);
                        if (fd < 0)
                            break;
                        nat_traversal_espinudp_socket(fd,
                            ESPINUDP_WITH_NON_ESP);
                        q = alloc_thing(struct iface, "struct iface");
                        q->rname = clone_str(ifp->name, "real device name");
                        q->vname = clone_str(v->name, "virtual device name");
                        q->addr = ifp->addr;
                        setportof(htons(NAT_T_IKE_FLOAT_PORT), &q->addr);
                        q->fd = fd;
                        q->next = interfaces;
                        q->change = IFN_ADD;
                        q->ike_float = TRUE;
                        interfaces = q;
                        plog("adding interface %s/%s %s:%d",
                        q->vname, q->rname, ip_str(&q->addr), NAT_T_IKE_FLOAT_PORT);
                    }
#endif
                    break;
                }

                /* search over if matching old entry found */
                if (streq(q->rname, ifp->name)
                && streq(q->vname, v->name)
                && sameaddr(&q->addr, &ifp->addr))
                {
                    /* matches -- rejuvinate old entry */
                    q->change = IFN_KEEP;
#ifdef NAT_TRAVERSAL
                    /* look for other interfaces to keep (due to NAT-T) */
                    for (q = q->next ; q ; q = q->next) {
                        if (streq(q->rname, ifp->name)
                            && streq(q->vname, v->name)
                            && sameaddr(&q->addr, &ifp->addr)) {
                                q->change = IFN_KEEP;
                        }
                    }
#endif
                    break;
                }

                /* try again */
                p = &q->next;
            } /* for (;;) */
        }
    }

    /* delete the raw interfaces list */
    while (rifaces != NULL)
    {
        struct raw_iface *t = rifaces;

        rifaces = t->next;
        pfree(t);
    }
}

void
find_ifaces(void)
{
    mark_ifaces_dead();
    process_raw_ifaces(find_raw_ifaces4());
    process_raw_ifaces(find_raw_ifaces6());

    free_dead_ifaces();     /* ditch remaining old entries */

    if (interfaces == NULL)
        loglog(RC_LOG_SERIOUS, "no public interfaces found");
}

void
show_ifaces_status(void)
{
    struct iface *p;

    for (p = interfaces; p != NULL; p = p->next)
        whack_log(RC_COMMENT, "interface %s/%s %s:%d"
            , p->vname, p->rname, ip_str(&p->addr), ntohs(portof(&p->addr)));
}

void
show_debug_status(void)
{
#ifdef DEBUG
    whack_log(RC_COMMENT, "debug %s"
        , bitnamesof(debug_bit_names, cur_debugging));
#endif
}

static volatile sig_atomic_t sighupflag = FALSE;

static void
huphandler(int sig UNUSED)
{
    sighupflag = TRUE;
}

static volatile sig_atomic_t sigtermflag = FALSE;

static void
termhandler(int sig UNUSED)
{
    sigtermflag = TRUE;
}

/* call_server listens for incoming ISAKMP packets and Whack messages,
 * and handles timer events.
 */
void
call_server(void)
{
    struct iface *ifp;

    /* catch SIGHUP and SIGTERM */
    {
        int r;
        struct sigaction act;

        act.sa_handler = &huphandler;
        sigemptyset(&act.sa_mask);
        act.sa_flags = 0;       /* no SA_ONESHOT, no SA_RESTART, no nothing */
        r = sigaction(SIGHUP, &act, NULL);
        passert(r == 0);

        act.sa_handler = &termhandler;
        r = sigaction(SIGTERM, &act, NULL);
        passert(r == 0);
    }

    for (;;)
    {
        fd_set readfds;
        fd_set writefds;
        int ndes;

        /* wait for next interesting thing */

        for (;;)
        {
            long next_time = next_event();   /* time to any pending timer event */
            int maxfd = ctl_fd;

            if (sigtermflag)
                exit_pluto(0);

            if (sighupflag)
            {
                /* Ignorant folks think poking any daemon with SIGHUP
                 * is polite.  We catch it and tell them otherwise.
                 * There is one use: unsticking a hung recvfrom.
                 * This sticking happens sometimes -- kernel bug?
                 */
                sighupflag = FALSE;
                plog("Pluto ignores SIGHUP -- perhaps you want \"whack --listen\"");
            }

            FD_ZERO(&readfds);
            FD_ZERO(&writefds);
            FD_SET(ctl_fd, &readfds);
#ifdef IPSECPOLICY
            FD_SET(info_fd, &readfds);
            if (maxfd < info_fd)
                maxfd = info_fd;
#endif

            /* the only write file-descriptor of interest */
            if (adns_qfd != NULL_FD && unsent_ADNS_queries)
            {
                if (maxfd < adns_qfd)
                    maxfd = adns_qfd;
                FD_SET(adns_qfd, &writefds);
            }

            if (adns_afd != NULL_FD)
            {
                if (maxfd < adns_afd)
                    maxfd = adns_afd;
                FD_SET(adns_afd, &readfds);
            }

#ifdef KLIPS
            if (!no_klips)
            {
                int fd = *kernel_ops->async_fdp;

                if (kernel_ops->process_queue)
                    kernel_ops->process_queue();
                if (maxfd < fd)
                    maxfd = fd;
                passert(!FD_ISSET(fd, &readfds));
                FD_SET(fd, &readfds);
            }
#endif

            if (listening)
            {
                for (ifp = interfaces; ifp != NULL; ifp = ifp->next)
                {
                    if (maxfd < ifp->fd)
                        maxfd = ifp->fd;
                    passert(!FD_ISSET(ifp->fd, &readfds));
                    FD_SET(ifp->fd, &readfds);
                }
            }

            if (next_time == -1)
            {
                /* select without timer */

                ndes = select(maxfd + 1, &readfds, &writefds, NULL, NULL);
            }
            else if (next_time == 0)
            {
                /* timer without select: there is a timer event pending,
                 * and it should fire now so don't bother to do the select.
                 */
                ndes = 0;       /* signify timer expiration */
            }
            else
            {
                /* select with timer */

                struct timeval tm;

                tm.tv_sec = next_time;
                tm.tv_usec = 0;
                ndes = select(maxfd + 1, &readfds, &writefds, NULL, &tm);
            }

            if (ndes != -1)
                break;  /* success */

            if (errno != EINTR)
                exit_log_errno((e, "select() failed in call_server()"));

            /* retry if terminated by signal */
        }

        /* figure out what is interesting */

        if (ndes == 0)
        {
            /* timer event */

            DBG(DBG_CONTROL,
                DBG_log(BLANK_FORMAT);
                DBG_log("*time to handle event"));

            handle_timer_event();
            passert(GLOBALS_ARE_RESET());
        }
        else
        {
            /* at least one file descriptor is ready */

            if (adns_qfd != NULL_FD && FD_ISSET(adns_qfd, &writefds))
            {
                passert(ndes > 0);
                send_unsent_ADNS_queries();
                passert(GLOBALS_ARE_RESET());
                ndes--;
            }

            if (adns_afd != NULL_FD && FD_ISSET(adns_afd, &readfds))
            {
                passert(ndes > 0);
                DBG(DBG_CONTROL,
                    DBG_log(BLANK_FORMAT);
                    DBG_log("*received adns message"));
                handle_adns_answer();
                passert(GLOBALS_ARE_RESET());
                ndes--;
            }

#ifdef KLIPS
            if (!no_klips && FD_ISSET(*kernel_ops->async_fdp, &readfds))
            {
                passert(ndes > 0);
                DBG(DBG_CONTROL,
                    DBG_log(BLANK_FORMAT);
                    DBG_log("*received kernel message"));
                kernel_ops->process_msg();
                passert(GLOBALS_ARE_RESET());
                ndes--;
            }
#endif

            for (ifp = interfaces; ifp != NULL; ifp = ifp->next)
            {
                if (FD_ISSET(ifp->fd, &readfds))
                {
                    /* comm_handle will print DBG_CONTROL intro,
                     * with more info than we have here.
                     */

                    passert(ndes > 0);
                    comm_handle(ifp);
                    passert(GLOBALS_ARE_RESET());
                    ndes--;
                }
            }

            if (FD_ISSET(ctl_fd, &readfds))
            {
                passert(ndes > 0);
                DBG(DBG_CONTROL,
                    DBG_log(BLANK_FORMAT);
                    DBG_log("*received whack message"));
                whack_handle(ctl_fd);
                passert(GLOBALS_ARE_RESET());
                ndes--;
            }

#ifdef IPSECPOLICY
            if (FD_ISSET(info_fd, &readfds))
            {
                passert(ndes > 0);
                DBG(DBG_CONTROL,
                    DBG_log(BLANK_FORMAT);
                    DBG_log("*received info message"));
                info_handle(info_fd);
                passert(GLOBALS_ARE_RESET());
                ndes--;
            }
#endif

            passert(ndes == 0);
        }
    }
}

/*
 * Local Variables:
 * c-basic-offset: 4
 * End Variables:
 */