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strongswan/src/pluto/server.c

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/* 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.
*/
#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 "pluto.h"
#include <pfkeyv2.h>
#include <pfkey.h>
#include "kameipsec.h"
#include "nat_traversal.h"
/*
* 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);
}
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 */
free(p->vname);
free(p->rname);
close(p->fd);
free(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)countof(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);
}
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);
}
}
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)
{
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 */
bool after = FALSE; /* has vfp passed ifp on the list? */
bool bad = FALSE;
struct raw_iface *vfp;
/* ignore if virtual (ipsec*) interface */
if (strneq(ifp->name, IPSECDEVPREFIX, sizeof(IPSECDEVPREFIX)-1))
{
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 (strneq(vfp->name, IPSECDEVPREFIX, sizeof(IPSECDEVPREFIX)-1))
{
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 (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)
{
v = ifp;
goto add_entry;
}
#endif
/* what if we didn't find a virtual interface? */
if (v == NULL)
{
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;
if (nat_traversal_support_non_ike
&& addrtypeof(&ifp->addr) == AF_INET)
{
nat_traversal_espinudp_socket(fd, ESPINUDP_WITH_NON_IKE);
}
q = malloc_thing(struct iface);
zero(q);
q->rname = clone_str(ifp->name);
q->vname = clone_str(v->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);
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 = malloc_thing(struct iface);
zero(q);
q->rname = clone_str(ifp->name);
q->vname = clone_str(v->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);
}
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;
/* 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;
}
}
break;
}
/* try again */
p = &q->next;
} /* for (;;) */
}
}
/* delete the raw interfaces list */
while (rifaces != NULL)
{
struct raw_iface *t = rifaces;
rifaces = t->next;
free(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 options: %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, events_fd;
/* 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);
/* 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);
}
events_fd = pluto->events->get_event_fd(pluto->events);
if (maxfd < events_fd)
maxfd = events_fd;
FD_SET(events_fd, &readfds);
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--;
}
if (FD_ISSET(events_fd, &readfds))
{
passert(ndes > 0);
DBG(DBG_CONTROL,
DBG_log(BLANK_FORMAT);
DBG_log("*handling asynchronous events"));
pluto->events->handle(pluto->events);
passert(GLOBALS_ARE_RESET());
ndes--;
}
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--;
}
passert(ndes == 0);
}
}
}
/*
* Local Variables:
* c-basic-offset: 4
* End Variables:
*/
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