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freebsd-nq/lib/isc/unix/socket.c
Doug Barton ca732c8b83 Vendor import of BIND 9.4.2-P2
2008-09-01 20:53:25 +00:00

3994 lines
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/*
* Copyright (C) 2004-2008 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1998-2003 Internet Software Consortium.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: socket.c,v 1.237.18.29.10.6 2008/07/29 04:47:31 each Exp $ */
/*! \file */
#include <config.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#ifdef ISC_PLATFORM_HAVESYSUNH
#include <sys/un.h>
#endif
#include <sys/time.h>
#include <sys/uio.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <isc/buffer.h>
#include <isc/bufferlist.h>
#include <isc/condition.h>
#include <isc/formatcheck.h>
#include <isc/list.h>
#include <isc/log.h>
#include <isc/mem.h>
#include <isc/msgs.h>
#include <isc/mutex.h>
#include <isc/net.h>
#include <isc/once.h>
#include <isc/platform.h>
#include <isc/print.h>
#include <isc/region.h>
#include <isc/socket.h>
#include <isc/strerror.h>
#include <isc/task.h>
#include <isc/thread.h>
#include <isc/util.h>
#include "errno2result.h"
#ifndef ISC_PLATFORM_USETHREADS
#include "socket_p.h"
#endif /* ISC_PLATFORM_USETHREADS */
/*%
* Max number of open sockets. In the vast majority of cases the default size
* of FD_SETSIZE should be fine, and this constant should be increased only
* when absolutely necessary and possible, i.e., the server is exhausting all
* available file descriptors (up to FD_SETSIZE) and the select() function
* and FD_xxx macros support larger values than FD_SETSIZE (which may not
* always by true, but we keep using some of them to ensure as much
* portability as possible). Note also that overall server performance
* may be rather worsened with a larger value of this constant due to
* inherent scalability problems of select().
*
* As a special note, this value shouldn't have to be touched if
* this is a build for an authoritative only DNS server.
*/
#ifndef ISC_SOCKET_FDSETSIZE
#define ISC_SOCKET_FDSETSIZE FD_SETSIZE
#endif
/*%
* Mac OS X needs a special definition to support larger values in select()
*/
#if ISC_SOCKET_FDSETSIZE > FD_SETSIZE
#ifdef __APPLE__
#define _DARWIN_UNLIMITED_SELECT
#endif /* __APPLE__ */
#endif
/*%
* Some systems define the socket length argument as an int, some as size_t,
* some as socklen_t. This is here so it can be easily changed if needed.
*/
#ifndef ISC_SOCKADDR_LEN_T
#define ISC_SOCKADDR_LEN_T unsigned int
#endif
#if defined(SO_BSDCOMPAT) && defined(__linux__)
#include <sys/utsname.h>
#endif
/*%
* Define what the possible "soft" errors can be. These are non-fatal returns
* of various network related functions, like recv() and so on.
*
* For some reason, BSDI (and perhaps others) will sometimes return <0
* from recv() but will have errno==0. This is broken, but we have to
* work around it here.
*/
#define SOFT_ERROR(e) ((e) == EAGAIN || \
(e) == EWOULDBLOCK || \
(e) == EINTR || \
(e) == 0)
#define DLVL(x) ISC_LOGCATEGORY_GENERAL, ISC_LOGMODULE_SOCKET, ISC_LOG_DEBUG(x)
/*!<
* DLVL(90) -- Function entry/exit and other tracing.
* DLVL(70) -- Socket "correctness" -- including returning of events, etc.
* DLVL(60) -- Socket data send/receive
* DLVL(50) -- Event tracing, including receiving/sending completion events.
* DLVL(20) -- Socket creation/destruction.
*/
#define TRACE_LEVEL 90
#define CORRECTNESS_LEVEL 70
#define IOEVENT_LEVEL 60
#define EVENT_LEVEL 50
#define CREATION_LEVEL 20
#define TRACE DLVL(TRACE_LEVEL)
#define CORRECTNESS DLVL(CORRECTNESS_LEVEL)
#define IOEVENT DLVL(IOEVENT_LEVEL)
#define EVENT DLVL(EVENT_LEVEL)
#define CREATION DLVL(CREATION_LEVEL)
typedef isc_event_t intev_t;
#define SOCKET_MAGIC ISC_MAGIC('I', 'O', 'i', 'o')
#define VALID_SOCKET(t) ISC_MAGIC_VALID(t, SOCKET_MAGIC)
/*!
* IPv6 control information. If the socket is an IPv6 socket we want
* to collect the destination address and interface so the client can
* set them on outgoing packets.
*/
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
#ifndef USE_CMSG
#define USE_CMSG 1
#endif
#endif
/*%
* NetBSD and FreeBSD can timestamp packets. XXXMLG Should we have
* a setsockopt() like interface to request timestamps, and if the OS
* doesn't do it for us, call gettimeofday() on every UDP receive?
*/
#ifdef SO_TIMESTAMP
#ifndef USE_CMSG
#define USE_CMSG 1
#endif
#endif
/*%
* The size to raise the recieve buffer to (from BIND 8).
*/
#define RCVBUFSIZE (32*1024)
/*%
* The number of times a send operation is repeated if the result is EINTR.
*/
#define NRETRIES 10
struct isc_socket {
/* Not locked. */
unsigned int magic;
isc_socketmgr_t *manager;
isc_mutex_t lock;
isc_sockettype_t type;
/* Locked by socket lock. */
ISC_LINK(isc_socket_t) link;
unsigned int references;
int fd;
int pf;
ISC_LIST(isc_socketevent_t) send_list;
ISC_LIST(isc_socketevent_t) recv_list;
ISC_LIST(isc_socket_newconnev_t) accept_list;
isc_socket_connev_t *connect_ev;
/*
* Internal events. Posted when a descriptor is readable or
* writable. These are statically allocated and never freed.
* They will be set to non-purgable before use.
*/
intev_t readable_ev;
intev_t writable_ev;
isc_sockaddr_t address; /* remote address */
unsigned int pending_recv : 1,
pending_send : 1,
pending_accept : 1,
listener : 1, /* listener socket */
connected : 1,
connecting : 1, /* connect pending */
bound : 1; /* bound to local addr */
#ifdef ISC_NET_RECVOVERFLOW
unsigned char overflow; /* used for MSG_TRUNC fake */
#endif
char *recvcmsgbuf;
ISC_SOCKADDR_LEN_T recvcmsgbuflen;
char *sendcmsgbuf;
ISC_SOCKADDR_LEN_T sendcmsgbuflen;
};
#define SOCKET_MANAGER_MAGIC ISC_MAGIC('I', 'O', 'm', 'g')
#define VALID_MANAGER(m) ISC_MAGIC_VALID(m, SOCKET_MANAGER_MAGIC)
struct isc_socketmgr {
/* Not locked. */
unsigned int magic;
isc_mem_t *mctx;
isc_mutex_t lock;
int fd_bufsize;
int fdsize;
/* Locked by manager lock. */
ISC_LIST(isc_socket_t) socklist;
fd_set *read_fds;
fd_set *read_fds_copy;
fd_set *write_fds;
fd_set *write_fds_copy;
isc_socket_t **fds;
int *fdstate;
int maxfd;
int reserved; /* unlocked */
#ifdef ISC_PLATFORM_USETHREADS
isc_thread_t watcher;
isc_condition_t shutdown_ok;
int pipe_fds[2];
#else /* ISC_PLATFORM_USETHREADS */
unsigned int refs;
#endif /* ISC_PLATFORM_USETHREADS */
};
#ifndef ISC_PLATFORM_USETHREADS
static isc_socketmgr_t *socketmgr = NULL;
#endif /* ISC_PLATFORM_USETHREADS */
#define CLOSED 0 /* this one must be zero */
#define MANAGED 1
#define CLOSE_PENDING 2
/*
* send() and recv() iovec counts
*/
#define MAXSCATTERGATHER_SEND (ISC_SOCKET_MAXSCATTERGATHER)
#ifdef ISC_NET_RECVOVERFLOW
# define MAXSCATTERGATHER_RECV (ISC_SOCKET_MAXSCATTERGATHER + 1)
#else
# define MAXSCATTERGATHER_RECV (ISC_SOCKET_MAXSCATTERGATHER)
#endif
static void send_recvdone_event(isc_socket_t *, isc_socketevent_t **);
static void send_senddone_event(isc_socket_t *, isc_socketevent_t **);
static void free_socket(isc_socket_t **);
static isc_result_t allocate_socket(isc_socketmgr_t *, isc_sockettype_t,
isc_socket_t **);
static void destroy(isc_socket_t **);
static void internal_accept(isc_task_t *, isc_event_t *);
static void internal_connect(isc_task_t *, isc_event_t *);
static void internal_recv(isc_task_t *, isc_event_t *);
static void internal_send(isc_task_t *, isc_event_t *);
static void process_cmsg(isc_socket_t *, struct msghdr *, isc_socketevent_t *);
static void build_msghdr_send(isc_socket_t *, isc_socketevent_t *,
struct msghdr *, struct iovec *, size_t *);
static void build_msghdr_recv(isc_socket_t *, isc_socketevent_t *,
struct msghdr *, struct iovec *, size_t *);
static void cleanup_fdsets(isc_socketmgr_t *, isc_mem_t *);
static isc_result_t create_fdsets(isc_socketmgr_t *, isc_mem_t *);
#define SELECT_POKE_SHUTDOWN (-1)
#define SELECT_POKE_NOTHING (-2)
#define SELECT_POKE_READ (-3)
#define SELECT_POKE_ACCEPT (-3) /*%< Same as _READ */
#define SELECT_POKE_WRITE (-4)
#define SELECT_POKE_CONNECT (-4) /*%< Same as _WRITE */
#define SELECT_POKE_CLOSE (-5)
#define SOCK_DEAD(s) ((s)->references == 0)
static void
manager_log(isc_socketmgr_t *sockmgr,
isc_logcategory_t *category, isc_logmodule_t *module, int level,
const char *fmt, ...) ISC_FORMAT_PRINTF(5, 6);
static void
manager_log(isc_socketmgr_t *sockmgr,
isc_logcategory_t *category, isc_logmodule_t *module, int level,
const char *fmt, ...)
{
char msgbuf[2048];
va_list ap;
if (! isc_log_wouldlog(isc_lctx, level))
return;
va_start(ap, fmt);
vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
va_end(ap);
isc_log_write(isc_lctx, category, module, level,
"sockmgr %p: %s", sockmgr, msgbuf);
}
static void
socket_log(isc_socket_t *sock, isc_sockaddr_t *address,
isc_logcategory_t *category, isc_logmodule_t *module, int level,
isc_msgcat_t *msgcat, int msgset, int message,
const char *fmt, ...) ISC_FORMAT_PRINTF(9, 10);
static void
socket_log(isc_socket_t *sock, isc_sockaddr_t *address,
isc_logcategory_t *category, isc_logmodule_t *module, int level,
isc_msgcat_t *msgcat, int msgset, int message,
const char *fmt, ...)
{
char msgbuf[2048];
char peerbuf[ISC_SOCKADDR_FORMATSIZE];
va_list ap;
if (! isc_log_wouldlog(isc_lctx, level))
return;
va_start(ap, fmt);
vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
va_end(ap);
if (address == NULL) {
isc_log_iwrite(isc_lctx, category, module, level,
msgcat, msgset, message,
"socket %p: %s", sock, msgbuf);
} else {
isc_sockaddr_format(address, peerbuf, sizeof(peerbuf));
isc_log_iwrite(isc_lctx, category, module, level,
msgcat, msgset, message,
"socket %p %s: %s", sock, peerbuf, msgbuf);
}
}
static void
wakeup_socket(isc_socketmgr_t *manager, int fd, int msg) {
isc_socket_t *sock;
/*
* This is a wakeup on a socket. If the socket is not in the
* process of being closed, start watching it for either reads
* or writes.
*/
INSIST(fd >= 0 && fd < manager->fdsize);
if (manager->fdstate[fd] == CLOSE_PENDING) {
manager->fdstate[fd] = CLOSED;
FD_CLR(fd, manager->read_fds);
FD_CLR(fd, manager->write_fds);
(void)close(fd);
return;
}
if (manager->fdstate[fd] != MANAGED)
return;
sock = manager->fds[fd];
/*
* Set requested bit.
*/
if (msg == SELECT_POKE_READ)
FD_SET(sock->fd, manager->read_fds);
if (msg == SELECT_POKE_WRITE)
FD_SET(sock->fd, manager->write_fds);
}
#ifdef ISC_PLATFORM_USETHREADS
/*
* Poke the select loop when there is something for us to do.
* The write is required (by POSIX) to complete. That is, we
* will not get partial writes.
*/
static void
select_poke(isc_socketmgr_t *mgr, int fd, int msg) {
int cc;
int buf[2];
char strbuf[ISC_STRERRORSIZE];
buf[0] = fd;
buf[1] = msg;
do {
cc = write(mgr->pipe_fds[1], buf, sizeof(buf));
#ifdef ENOSR
/*
* Treat ENOSR as EAGAIN but loop slowly as it is
* unlikely to clear fast.
*/
if (cc < 0 && errno == ENOSR) {
sleep(1);
errno = EAGAIN;
}
#endif
} while (cc < 0 && SOFT_ERROR(errno));
if (cc < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
FATAL_ERROR(__FILE__, __LINE__,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_WRITEFAILED,
"write() failed "
"during watcher poke: %s"),
strbuf);
}
INSIST(cc == sizeof(buf));
}
/*
* Read a message on the internal fd.
*/
static void
select_readmsg(isc_socketmgr_t *mgr, int *fd, int *msg) {
int buf[2];
int cc;
char strbuf[ISC_STRERRORSIZE];
cc = read(mgr->pipe_fds[0], buf, sizeof(buf));
if (cc < 0) {
*msg = SELECT_POKE_NOTHING;
*fd = -1; /* Silence compiler. */
if (SOFT_ERROR(errno))
return;
isc__strerror(errno, strbuf, sizeof(strbuf));
FATAL_ERROR(__FILE__, __LINE__,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_READFAILED,
"read() failed "
"during watcher poke: %s"),
strbuf);
return;
}
INSIST(cc == sizeof(buf));
*fd = buf[0];
*msg = buf[1];
}
#else /* ISC_PLATFORM_USETHREADS */
/*
* Update the state of the socketmgr when something changes.
*/
static void
select_poke(isc_socketmgr_t *manager, int fd, int msg) {
if (msg == SELECT_POKE_SHUTDOWN)
return;
else if (fd >= 0)
wakeup_socket(manager, fd, msg);
return;
}
#endif /* ISC_PLATFORM_USETHREADS */
/*
* Make a fd non-blocking.
*/
static isc_result_t
make_nonblock(int fd) {
int ret;
int flags;
char strbuf[ISC_STRERRORSIZE];
#ifdef USE_FIONBIO_IOCTL
int on = 1;
ret = ioctl(fd, FIONBIO, (char *)&on);
#else
flags = fcntl(fd, F_GETFL, 0);
flags |= PORT_NONBLOCK;
ret = fcntl(fd, F_SETFL, flags);
#endif
if (ret == -1) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
#ifdef USE_FIONBIO_IOCTL
"ioctl(%d, FIONBIO, &on): %s", fd,
#else
"fcntl(%d, F_SETFL, %d): %s", fd, flags,
#endif
strbuf);
return (ISC_R_UNEXPECTED);
}
return (ISC_R_SUCCESS);
}
#ifdef USE_CMSG
/*
* Not all OSes support advanced CMSG macros: CMSG_LEN and CMSG_SPACE.
* In order to ensure as much portability as possible, we provide wrapper
* functions of these macros.
* Note that cmsg_space() could run slow on OSes that do not have
* CMSG_SPACE.
*/
static inline ISC_SOCKADDR_LEN_T
cmsg_len(ISC_SOCKADDR_LEN_T len) {
#ifdef CMSG_LEN
return (CMSG_LEN(len));
#else
ISC_SOCKADDR_LEN_T hdrlen;
/*
* Cast NULL so that any pointer arithmetic performed by CMSG_DATA
* is correct.
*/
hdrlen = (ISC_SOCKADDR_LEN_T)CMSG_DATA(((struct cmsghdr *)NULL));
return (hdrlen + len);
#endif
}
static inline ISC_SOCKADDR_LEN_T
cmsg_space(ISC_SOCKADDR_LEN_T len) {
#ifdef CMSG_SPACE
return (CMSG_SPACE(len));
#else
struct msghdr msg;
struct cmsghdr *cmsgp;
/*
* XXX: The buffer length is an ad-hoc value, but should be enough
* in a practical sense.
*/
char dummybuf[sizeof(struct cmsghdr) + 1024];
memset(&msg, 0, sizeof(msg));
msg.msg_control = dummybuf;
msg.msg_controllen = sizeof(dummybuf);
cmsgp = (struct cmsghdr *)dummybuf;
cmsgp->cmsg_len = cmsg_len(len);
cmsgp = CMSG_NXTHDR(&msg, cmsgp);
if (cmsgp != NULL)
return ((char *)cmsgp - (char *)msg.msg_control);
else
return (0);
#endif
}
#endif /* USE_CMSG */
/*
* Process control messages received on a socket.
*/
static void
process_cmsg(isc_socket_t *sock, struct msghdr *msg, isc_socketevent_t *dev) {
#ifdef USE_CMSG
struct cmsghdr *cmsgp;
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
struct in6_pktinfo *pktinfop;
#endif
#ifdef SO_TIMESTAMP
struct timeval *timevalp;
#endif
#endif
/*
* sock is used only when ISC_NET_BSD44MSGHDR and USE_CMSG are defined.
* msg and dev are used only when ISC_NET_BSD44MSGHDR is defined.
* They are all here, outside of the CPP tests, because it is
* more consistent with the usual ISC coding style.
*/
UNUSED(sock);
UNUSED(msg);
UNUSED(dev);
#ifdef ISC_NET_BSD44MSGHDR
#ifdef MSG_TRUNC
if ((msg->msg_flags & MSG_TRUNC) == MSG_TRUNC)
dev->attributes |= ISC_SOCKEVENTATTR_TRUNC;
#endif
#ifdef MSG_CTRUNC
if ((msg->msg_flags & MSG_CTRUNC) == MSG_CTRUNC)
dev->attributes |= ISC_SOCKEVENTATTR_CTRUNC;
#endif
#ifndef USE_CMSG
return;
#else
if (msg->msg_controllen == 0U || msg->msg_control == NULL)
return;
#ifdef SO_TIMESTAMP
timevalp = NULL;
#endif
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
pktinfop = NULL;
#endif
cmsgp = CMSG_FIRSTHDR(msg);
while (cmsgp != NULL) {
socket_log(sock, NULL, TRACE,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_PROCESSCMSG,
"processing cmsg %p", cmsgp);
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
if (cmsgp->cmsg_level == IPPROTO_IPV6
&& cmsgp->cmsg_type == IPV6_PKTINFO) {
pktinfop = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
memcpy(&dev->pktinfo, pktinfop,
sizeof(struct in6_pktinfo));
dev->attributes |= ISC_SOCKEVENTATTR_PKTINFO;
socket_log(sock, NULL, TRACE,
isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_IFRECEIVED,
"interface received on ifindex %u",
dev->pktinfo.ipi6_ifindex);
if (IN6_IS_ADDR_MULTICAST(&pktinfop->ipi6_addr))
dev->attributes |= ISC_SOCKEVENTATTR_MULTICAST;
goto next;
}
#endif
#ifdef SO_TIMESTAMP
if (cmsgp->cmsg_level == SOL_SOCKET
&& cmsgp->cmsg_type == SCM_TIMESTAMP) {
timevalp = (struct timeval *)CMSG_DATA(cmsgp);
dev->timestamp.seconds = timevalp->tv_sec;
dev->timestamp.nanoseconds = timevalp->tv_usec * 1000;
dev->attributes |= ISC_SOCKEVENTATTR_TIMESTAMP;
goto next;
}
#endif
next:
cmsgp = CMSG_NXTHDR(msg, cmsgp);
}
#endif /* USE_CMSG */
#endif /* ISC_NET_BSD44MSGHDR */
}
/*
* Construct an iov array and attach it to the msghdr passed in. This is
* the SEND constructor, which will use the used region of the buffer
* (if using a buffer list) or will use the internal region (if a single
* buffer I/O is requested).
*
* Nothing can be NULL, and the done event must list at least one buffer
* on the buffer linked list for this function to be meaningful.
*
* If write_countp != NULL, *write_countp will hold the number of bytes
* this transaction can send.
*/
static void
build_msghdr_send(isc_socket_t *sock, isc_socketevent_t *dev,
struct msghdr *msg, struct iovec *iov, size_t *write_countp)
{
unsigned int iovcount;
isc_buffer_t *buffer;
isc_region_t used;
size_t write_count;
size_t skip_count;
memset(msg, 0, sizeof(*msg));
if (sock->type == isc_sockettype_udp) {
msg->msg_name = (void *)&dev->address.type.sa;
msg->msg_namelen = dev->address.length;
} else {
msg->msg_name = NULL;
msg->msg_namelen = 0;
}
buffer = ISC_LIST_HEAD(dev->bufferlist);
write_count = 0;
iovcount = 0;
/*
* Single buffer I/O? Skip what we've done so far in this region.
*/
if (buffer == NULL) {
write_count = dev->region.length - dev->n;
iov[0].iov_base = (void *)(dev->region.base + dev->n);
iov[0].iov_len = write_count;
iovcount = 1;
goto config;
}
/*
* Multibuffer I/O.
* Skip the data in the buffer list that we have already written.
*/
skip_count = dev->n;
while (buffer != NULL) {
REQUIRE(ISC_BUFFER_VALID(buffer));
if (skip_count < isc_buffer_usedlength(buffer))
break;
skip_count -= isc_buffer_usedlength(buffer);
buffer = ISC_LIST_NEXT(buffer, link);
}
while (buffer != NULL) {
INSIST(iovcount < MAXSCATTERGATHER_SEND);
isc_buffer_usedregion(buffer, &used);
if (used.length > 0) {
iov[iovcount].iov_base = (void *)(used.base
+ skip_count);
iov[iovcount].iov_len = used.length - skip_count;
write_count += (used.length - skip_count);
skip_count = 0;
iovcount++;
}
buffer = ISC_LIST_NEXT(buffer, link);
}
INSIST(skip_count == 0U);
config:
msg->msg_iov = iov;
msg->msg_iovlen = iovcount;
#ifdef ISC_NET_BSD44MSGHDR
msg->msg_control = NULL;
msg->msg_controllen = 0;
msg->msg_flags = 0;
#if defined(USE_CMSG) && defined(ISC_PLATFORM_HAVEIN6PKTINFO)
if ((sock->type == isc_sockettype_udp)
&& ((dev->attributes & ISC_SOCKEVENTATTR_PKTINFO) != 0)) {
struct cmsghdr *cmsgp;
struct in6_pktinfo *pktinfop;
socket_log(sock, NULL, TRACE,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_SENDTODATA,
"sendto pktinfo data, ifindex %u",
dev->pktinfo.ipi6_ifindex);
msg->msg_controllen = cmsg_space(sizeof(struct in6_pktinfo));
INSIST(msg->msg_controllen <= sock->sendcmsgbuflen);
msg->msg_control = (void *)sock->sendcmsgbuf;
cmsgp = (struct cmsghdr *)sock->sendcmsgbuf;
cmsgp->cmsg_level = IPPROTO_IPV6;
cmsgp->cmsg_type = IPV6_PKTINFO;
cmsgp->cmsg_len = cmsg_len(sizeof(struct in6_pktinfo));
pktinfop = (struct in6_pktinfo *)CMSG_DATA(cmsgp);
memcpy(pktinfop, &dev->pktinfo, sizeof(struct in6_pktinfo));
}
#endif /* USE_CMSG && ISC_PLATFORM_HAVEIPV6 */
#else /* ISC_NET_BSD44MSGHDR */
msg->msg_accrights = NULL;
msg->msg_accrightslen = 0;
#endif /* ISC_NET_BSD44MSGHDR */
if (write_countp != NULL)
*write_countp = write_count;
}
/*
* Construct an iov array and attach it to the msghdr passed in. This is
* the RECV constructor, which will use the avialable region of the buffer
* (if using a buffer list) or will use the internal region (if a single
* buffer I/O is requested).
*
* Nothing can be NULL, and the done event must list at least one buffer
* on the buffer linked list for this function to be meaningful.
*
* If read_countp != NULL, *read_countp will hold the number of bytes
* this transaction can receive.
*/
static void
build_msghdr_recv(isc_socket_t *sock, isc_socketevent_t *dev,
struct msghdr *msg, struct iovec *iov, size_t *read_countp)
{
unsigned int iovcount;
isc_buffer_t *buffer;
isc_region_t available;
size_t read_count;
memset(msg, 0, sizeof(struct msghdr));
if (sock->type == isc_sockettype_udp) {
memset(&dev->address, 0, sizeof(dev->address));
#ifdef BROKEN_RECVMSG
if (sock->pf == AF_INET) {
msg->msg_name = (void *)&dev->address.type.sin;
msg->msg_namelen = sizeof(dev->address.type.sin6);
} else if (sock->pf == AF_INET6) {
msg->msg_name = (void *)&dev->address.type.sin6;
msg->msg_namelen = sizeof(dev->address.type.sin6);
#ifdef ISC_PLATFORM_HAVESYSUNH
} else if (sock->pf == AF_UNIX) {
msg->msg_name = (void *)&dev->address.type.sunix;
msg->msg_namelen = sizeof(dev->address.type.sunix);
#endif
} else {
msg->msg_name = (void *)&dev->address.type.sa;
msg->msg_namelen = sizeof(dev->address.type);
}
#else
msg->msg_name = (void *)&dev->address.type.sa;
msg->msg_namelen = sizeof(dev->address.type);
#endif
#ifdef ISC_NET_RECVOVERFLOW
/* If needed, steal one iovec for overflow detection. */
maxiov--;
#endif
} else { /* TCP */
msg->msg_name = NULL;
msg->msg_namelen = 0;
dev->address = sock->address;
}
buffer = ISC_LIST_HEAD(dev->bufferlist);
read_count = 0;
/*
* Single buffer I/O? Skip what we've done so far in this region.
*/
if (buffer == NULL) {
read_count = dev->region.length - dev->n;
iov[0].iov_base = (void *)(dev->region.base + dev->n);
iov[0].iov_len = read_count;
iovcount = 1;
goto config;
}
/*
* Multibuffer I/O.
* Skip empty buffers.
*/
while (buffer != NULL) {
REQUIRE(ISC_BUFFER_VALID(buffer));
if (isc_buffer_availablelength(buffer) != 0)
break;
buffer = ISC_LIST_NEXT(buffer, link);
}
iovcount = 0;
while (buffer != NULL) {
INSIST(iovcount < MAXSCATTERGATHER_RECV);
isc_buffer_availableregion(buffer, &available);
if (available.length > 0) {
iov[iovcount].iov_base = (void *)(available.base);
iov[iovcount].iov_len = available.length;
read_count += available.length;
iovcount++;
}
buffer = ISC_LIST_NEXT(buffer, link);
}
config:
/*
* If needed, set up to receive that one extra byte. Note that
* we know there is at least one iov left, since we stole it
* at the top of this function.
*/
#ifdef ISC_NET_RECVOVERFLOW
if (sock->type == isc_sockettype_udp) {
iov[iovcount].iov_base = (void *)(&sock->overflow);
iov[iovcount].iov_len = 1;
iovcount++;
}
#endif
msg->msg_iov = iov;
msg->msg_iovlen = iovcount;
#ifdef ISC_NET_BSD44MSGHDR
msg->msg_control = NULL;
msg->msg_controllen = 0;
msg->msg_flags = 0;
#if defined(USE_CMSG)
if (sock->type == isc_sockettype_udp) {
msg->msg_control = sock->recvcmsgbuf;
msg->msg_controllen = sock->recvcmsgbuflen;
}
#endif /* USE_CMSG */
#else /* ISC_NET_BSD44MSGHDR */
msg->msg_accrights = NULL;
msg->msg_accrightslen = 0;
#endif /* ISC_NET_BSD44MSGHDR */
if (read_countp != NULL)
*read_countp = read_count;
}
static void
set_dev_address(isc_sockaddr_t *address, isc_socket_t *sock,
isc_socketevent_t *dev)
{
if (sock->type == isc_sockettype_udp) {
if (address != NULL)
dev->address = *address;
else
dev->address = sock->address;
} else if (sock->type == isc_sockettype_tcp) {
INSIST(address == NULL);
dev->address = sock->address;
}
}
static void
destroy_socketevent(isc_event_t *event) {
isc_socketevent_t *ev = (isc_socketevent_t *)event;
INSIST(ISC_LIST_EMPTY(ev->bufferlist));
(ev->destroy)(event);
}
static isc_socketevent_t *
allocate_socketevent(isc_socket_t *sock, isc_eventtype_t eventtype,
isc_taskaction_t action, const void *arg)
{
isc_socketevent_t *ev;
ev = (isc_socketevent_t *)isc_event_allocate(sock->manager->mctx,
sock, eventtype,
action, arg,
sizeof(*ev));
if (ev == NULL)
return (NULL);
ev->result = ISC_R_UNEXPECTED;
ISC_LINK_INIT(ev, ev_link);
ISC_LIST_INIT(ev->bufferlist);
ev->region.base = NULL;
ev->n = 0;
ev->offset = 0;
ev->attributes = 0;
ev->destroy = ev->ev_destroy;
ev->ev_destroy = destroy_socketevent;
return (ev);
}
#if defined(ISC_SOCKET_DEBUG)
static void
dump_msg(struct msghdr *msg) {
unsigned int i;
printf("MSGHDR %p\n", msg);
printf("\tname %p, namelen %d\n", msg->msg_name, msg->msg_namelen);
printf("\tiov %p, iovlen %d\n", msg->msg_iov, msg->msg_iovlen);
for (i = 0; i < (unsigned int)msg->msg_iovlen; i++)
printf("\t\t%d\tbase %p, len %d\n", i,
msg->msg_iov[i].iov_base,
msg->msg_iov[i].iov_len);
#ifdef ISC_NET_BSD44MSGHDR
printf("\tcontrol %p, controllen %d\n", msg->msg_control,
msg->msg_controllen);
#endif
}
#endif
#define DOIO_SUCCESS 0 /* i/o ok, event sent */
#define DOIO_SOFT 1 /* i/o ok, soft error, no event sent */
#define DOIO_HARD 2 /* i/o error, event sent */
#define DOIO_EOF 3 /* EOF, no event sent */
static int
doio_recv(isc_socket_t *sock, isc_socketevent_t *dev) {
int cc;
struct iovec iov[MAXSCATTERGATHER_RECV];
size_t read_count;
size_t actual_count;
struct msghdr msghdr;
isc_buffer_t *buffer;
int recv_errno;
char strbuf[ISC_STRERRORSIZE];
build_msghdr_recv(sock, dev, &msghdr, iov, &read_count);
#if defined(ISC_SOCKET_DEBUG)
dump_msg(&msghdr);
#endif
cc = recvmsg(sock->fd, &msghdr, 0);
recv_errno = errno;
#if defined(ISC_SOCKET_DEBUG)
dump_msg(&msghdr);
#endif
if (cc < 0) {
if (SOFT_ERROR(recv_errno))
return (DOIO_SOFT);
if (isc_log_wouldlog(isc_lctx, IOEVENT_LEVEL)) {
isc__strerror(recv_errno, strbuf, sizeof(strbuf));
socket_log(sock, NULL, IOEVENT,
isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_DOIORECV,
"doio_recv: recvmsg(%d) %d bytes, err %d/%s",
sock->fd, cc, recv_errno, strbuf);
}
#define SOFT_OR_HARD(_system, _isc) \
if (recv_errno == _system) { \
if (sock->connected) { \
dev->result = _isc; \
return (DOIO_HARD); \
} \
return (DOIO_SOFT); \
}
#define ALWAYS_HARD(_system, _isc) \
if (recv_errno == _system) { \
dev->result = _isc; \
return (DOIO_HARD); \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
SOFT_OR_HARD(ENETUNREACH, ISC_R_NETUNREACH);
SOFT_OR_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
SOFT_OR_HARD(EHOSTDOWN, ISC_R_HOSTDOWN);
/* HPUX 11.11 can return EADDRNOTAVAIL. */
SOFT_OR_HARD(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
ALWAYS_HARD(ENOBUFS, ISC_R_NORESOURCES);
#undef SOFT_OR_HARD
#undef ALWAYS_HARD
dev->result = isc__errno2result(recv_errno);
return (DOIO_HARD);
}
/*
* On TCP, zero length reads indicate EOF, while on
* UDP, zero length reads are perfectly valid, although
* strange.
*/
if ((sock->type == isc_sockettype_tcp) && (cc == 0))
return (DOIO_EOF);
if (sock->type == isc_sockettype_udp) {
dev->address.length = msghdr.msg_namelen;
if (isc_sockaddr_getport(&dev->address) == 0) {
if (isc_log_wouldlog(isc_lctx, IOEVENT_LEVEL)) {
socket_log(sock, &dev->address, IOEVENT,
isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_ZEROPORT,
"dropping source port zero packet");
}
return (DOIO_SOFT);
}
}
socket_log(sock, &dev->address, IOEVENT,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_PKTRECV,
"packet received correctly");
/*
* Overflow bit detection. If we received MORE bytes than we should,
* this indicates an overflow situation. Set the flag in the
* dev entry and adjust how much we read by one.
*/
#ifdef ISC_NET_RECVOVERFLOW
if ((sock->type == isc_sockettype_udp) && ((size_t)cc > read_count)) {
dev->attributes |= ISC_SOCKEVENTATTR_TRUNC;
cc--;
}
#endif
/*
* If there are control messages attached, run through them and pull
* out the interesting bits.
*/
if (sock->type == isc_sockettype_udp)
process_cmsg(sock, &msghdr, dev);
/*
* update the buffers (if any) and the i/o count
*/
dev->n += cc;
actual_count = cc;
buffer = ISC_LIST_HEAD(dev->bufferlist);
while (buffer != NULL && actual_count > 0U) {
REQUIRE(ISC_BUFFER_VALID(buffer));
if (isc_buffer_availablelength(buffer) <= actual_count) {
actual_count -= isc_buffer_availablelength(buffer);
isc_buffer_add(buffer,
isc_buffer_availablelength(buffer));
} else {
isc_buffer_add(buffer, actual_count);
actual_count = 0;
break;
}
buffer = ISC_LIST_NEXT(buffer, link);
if (buffer == NULL) {
INSIST(actual_count == 0U);
}
}
/*
* If we read less than we expected, update counters,
* and let the upper layer poke the descriptor.
*/
if (((size_t)cc != read_count) && (dev->n < dev->minimum))
return (DOIO_SOFT);
/*
* Full reads are posted, or partials if partials are ok.
*/
dev->result = ISC_R_SUCCESS;
return (DOIO_SUCCESS);
}
/*
* Returns:
* DOIO_SUCCESS The operation succeeded. dev->result contains
* ISC_R_SUCCESS.
*
* DOIO_HARD A hard or unexpected I/O error was encountered.
* dev->result contains the appropriate error.
*
* DOIO_SOFT A soft I/O error was encountered. No senddone
* event was sent. The operation should be retried.
*
* No other return values are possible.
*/
static int
doio_send(isc_socket_t *sock, isc_socketevent_t *dev) {
int cc;
struct iovec iov[MAXSCATTERGATHER_SEND];
size_t write_count;
struct msghdr msghdr;
char addrbuf[ISC_SOCKADDR_FORMATSIZE];
int attempts = 0;
int send_errno;
char strbuf[ISC_STRERRORSIZE];
build_msghdr_send(sock, dev, &msghdr, iov, &write_count);
resend:
cc = sendmsg(sock->fd, &msghdr, 0);
send_errno = errno;
/*
* Check for error or block condition.
*/
if (cc < 0) {
if (send_errno == EINTR && ++attempts < NRETRIES)
goto resend;
if (SOFT_ERROR(send_errno))
return (DOIO_SOFT);
#define SOFT_OR_HARD(_system, _isc) \
if (send_errno == _system) { \
if (sock->connected) { \
dev->result = _isc; \
return (DOIO_HARD); \
} \
return (DOIO_SOFT); \
}
#define ALWAYS_HARD(_system, _isc) \
if (send_errno == _system) { \
dev->result = _isc; \
return (DOIO_HARD); \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
ALWAYS_HARD(EACCES, ISC_R_NOPERM);
ALWAYS_HARD(EAFNOSUPPORT, ISC_R_ADDRNOTAVAIL);
ALWAYS_HARD(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
ALWAYS_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
#ifdef EHOSTDOWN
ALWAYS_HARD(EHOSTDOWN, ISC_R_HOSTUNREACH);
#endif
ALWAYS_HARD(ENETUNREACH, ISC_R_NETUNREACH);
ALWAYS_HARD(ENOBUFS, ISC_R_NORESOURCES);
ALWAYS_HARD(EPERM, ISC_R_HOSTUNREACH);
ALWAYS_HARD(EPIPE, ISC_R_NOTCONNECTED);
ALWAYS_HARD(ECONNRESET, ISC_R_CONNECTIONRESET);
#undef SOFT_OR_HARD
#undef ALWAYS_HARD
/*
* The other error types depend on whether or not the
* socket is UDP or TCP. If it is UDP, some errors
* that we expect to be fatal under TCP are merely
* annoying, and are really soft errors.
*
* However, these soft errors are still returned as
* a status.
*/
isc_sockaddr_format(&dev->address, addrbuf, sizeof(addrbuf));
isc__strerror(send_errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__, "internal_send: %s: %s",
addrbuf, strbuf);
dev->result = isc__errno2result(send_errno);
return (DOIO_HARD);
}
if (cc == 0)
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_send: send() %s 0",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_RETURNED, "returned"));
/*
* If we write less than we expected, update counters, poke.
*/
dev->n += cc;
if ((size_t)cc != write_count)
return (DOIO_SOFT);
/*
* Exactly what we wanted to write. We're done with this
* entry. Post its completion event.
*/
dev->result = ISC_R_SUCCESS;
return (DOIO_SUCCESS);
}
/*
* Kill.
*
* Caller must ensure that the socket is not locked and no external
* references exist.
*/
static void
destroy(isc_socket_t **sockp) {
isc_socket_t *sock = *sockp;
isc_socketmgr_t *manager = sock->manager;
socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_DESTROYING, "destroying");
INSIST(ISC_LIST_EMPTY(sock->accept_list));
INSIST(ISC_LIST_EMPTY(sock->recv_list));
INSIST(ISC_LIST_EMPTY(sock->send_list));
INSIST(sock->connect_ev == NULL);
REQUIRE(sock->fd >= 0 && sock->fd < (int)manager->fdsize);
LOCK(&manager->lock);
/*
* No one has this socket open, so the watcher doesn't have to be
* poked, and the socket doesn't have to be locked.
*/
manager->fds[sock->fd] = NULL;
manager->fdstate[sock->fd] = CLOSE_PENDING;
select_poke(manager, sock->fd, SELECT_POKE_CLOSE);
ISC_LIST_UNLINK(manager->socklist, sock, link);
#ifdef ISC_PLATFORM_USETHREADS
if (ISC_LIST_EMPTY(manager->socklist))
SIGNAL(&manager->shutdown_ok);
#endif /* ISC_PLATFORM_USETHREADS */
/*
* XXX should reset manager->maxfd here
*/
UNLOCK(&manager->lock);
free_socket(sockp);
}
static isc_result_t
allocate_socket(isc_socketmgr_t *manager, isc_sockettype_t type,
isc_socket_t **socketp)
{
isc_socket_t *sock;
isc_result_t result;
ISC_SOCKADDR_LEN_T cmsgbuflen;
sock = isc_mem_get(manager->mctx, sizeof(*sock));
if (sock == NULL)
return (ISC_R_NOMEMORY);
result = ISC_R_UNEXPECTED;
sock->magic = 0;
sock->references = 0;
sock->manager = manager;
sock->type = type;
sock->fd = -1;
ISC_LINK_INIT(sock, link);
sock->recvcmsgbuf = NULL;
sock->sendcmsgbuf = NULL;
/*
* set up cmsg buffers
*/
cmsgbuflen = 0;
#if defined(USE_CMSG) && defined(ISC_PLATFORM_HAVEIN6PKTINFO)
cmsgbuflen = cmsg_space(sizeof(struct in6_pktinfo));
#endif
#if defined(USE_CMSG) && defined(SO_TIMESTAMP)
cmsgbuflen += cmsg_space(sizeof(struct timeval));
#endif
sock->recvcmsgbuflen = cmsgbuflen;
if (sock->recvcmsgbuflen != 0U) {
sock->recvcmsgbuf = isc_mem_get(manager->mctx, cmsgbuflen);
if (sock->recvcmsgbuf == NULL)
goto error;
}
cmsgbuflen = 0;
#if defined(USE_CMSG) && defined(ISC_PLATFORM_HAVEIN6PKTINFO)
cmsgbuflen = cmsg_space(sizeof(struct in6_pktinfo));
#endif
sock->sendcmsgbuflen = cmsgbuflen;
if (sock->sendcmsgbuflen != 0U) {
sock->sendcmsgbuf = isc_mem_get(manager->mctx, cmsgbuflen);
if (sock->sendcmsgbuf == NULL)
goto error;
}
/*
* set up list of readers and writers to be initially empty
*/
ISC_LIST_INIT(sock->recv_list);
ISC_LIST_INIT(sock->send_list);
ISC_LIST_INIT(sock->accept_list);
sock->connect_ev = NULL;
sock->pending_recv = 0;
sock->pending_send = 0;
sock->pending_accept = 0;
sock->listener = 0;
sock->connected = 0;
sock->connecting = 0;
sock->bound = 0;
/*
* initialize the lock
*/
result = isc_mutex_init(&sock->lock);
if (result != ISC_R_SUCCESS) {
sock->magic = 0;
goto error;
}
/*
* Initialize readable and writable events
*/
ISC_EVENT_INIT(&sock->readable_ev, sizeof(intev_t),
ISC_EVENTATTR_NOPURGE, NULL, ISC_SOCKEVENT_INTR,
NULL, sock, sock, NULL, NULL);
ISC_EVENT_INIT(&sock->writable_ev, sizeof(intev_t),
ISC_EVENTATTR_NOPURGE, NULL, ISC_SOCKEVENT_INTW,
NULL, sock, sock, NULL, NULL);
sock->magic = SOCKET_MAGIC;
*socketp = sock;
return (ISC_R_SUCCESS);
error:
if (sock->recvcmsgbuf != NULL)
isc_mem_put(manager->mctx, sock->recvcmsgbuf,
sock->recvcmsgbuflen);
if (sock->sendcmsgbuf != NULL)
isc_mem_put(manager->mctx, sock->sendcmsgbuf,
sock->sendcmsgbuflen);
isc_mem_put(manager->mctx, sock, sizeof(*sock));
return (result);
}
/*
* This event requires that the various lists be empty, that the reference
* count be 1, and that the magic number is valid. The other socket bits,
* like the lock, must be initialized as well. The fd associated must be
* marked as closed, by setting it to -1 on close, or this routine will
* also close the socket.
*/
static void
free_socket(isc_socket_t **socketp) {
isc_socket_t *sock = *socketp;
INSIST(sock->references == 0);
INSIST(VALID_SOCKET(sock));
INSIST(!sock->connecting);
INSIST(!sock->pending_recv);
INSIST(!sock->pending_send);
INSIST(!sock->pending_accept);
INSIST(ISC_LIST_EMPTY(sock->recv_list));
INSIST(ISC_LIST_EMPTY(sock->send_list));
INSIST(ISC_LIST_EMPTY(sock->accept_list));
INSIST(!ISC_LINK_LINKED(sock, link));
if (sock->recvcmsgbuf != NULL)
isc_mem_put(sock->manager->mctx, sock->recvcmsgbuf,
sock->recvcmsgbuflen);
if (sock->sendcmsgbuf != NULL)
isc_mem_put(sock->manager->mctx, sock->sendcmsgbuf,
sock->sendcmsgbuflen);
sock->magic = 0;
DESTROYLOCK(&sock->lock);
isc_mem_put(sock->manager->mctx, sock, sizeof(*sock));
*socketp = NULL;
}
#ifdef SO_BSDCOMPAT
/*
* This really should not be necessary to do. Having to workout
* which kernel version we are on at run time so that we don't cause
* the kernel to issue a warning about us using a deprecated socket option.
* Such warnings should *never* be on by default in production kernels.
*
* We can't do this a build time because executables are moved between
* machines and hence kernels.
*
* We can't just not set SO_BSDCOMAT because some kernels require it.
*/
static isc_once_t bsdcompat_once = ISC_ONCE_INIT;
isc_boolean_t bsdcompat = ISC_TRUE;
static void
clear_bsdcompat(void) {
#ifdef __linux__
struct utsname buf;
char *endp;
long int major;
long int minor;
uname(&buf); /* Can only fail if buf is bad in Linux. */
/* Paranoia in parsing can be increased, but we trust uname(). */
major = strtol(buf.release, &endp, 10);
if (*endp == '.') {
minor = strtol(endp+1, &endp, 10);
if ((major > 2) || ((major == 2) && (minor >= 4))) {
bsdcompat = ISC_FALSE;
}
}
#endif /* __linux __ */
}
#endif
/*%
* Create a new 'type' socket managed by 'manager'. Events
* will be posted to 'task' and when dispatched 'action' will be
* called with 'arg' as the arg value. The new socket is returned
* in 'socketp'.
*/
isc_result_t
isc_socket_create(isc_socketmgr_t *manager, int pf, isc_sockettype_t type,
isc_socket_t **socketp)
{
isc_socket_t *sock = NULL;
isc_result_t result;
#if defined(USE_CMSG) || defined(SO_BSDCOMPAT)
int on = 1;
#endif
#if defined(SO_RCVBUF)
ISC_SOCKADDR_LEN_T optlen;
int size;
#endif
char strbuf[ISC_STRERRORSIZE];
const char *err = "socket";
int try = 0;
REQUIRE(VALID_MANAGER(manager));
REQUIRE(socketp != NULL && *socketp == NULL);
result = allocate_socket(manager, type, &sock);
if (result != ISC_R_SUCCESS)
return (result);
sock->pf = pf;
again:
switch (type) {
case isc_sockettype_udp:
sock->fd = socket(pf, SOCK_DGRAM, IPPROTO_UDP);
break;
case isc_sockettype_tcp:
sock->fd = socket(pf, SOCK_STREAM, IPPROTO_TCP);
break;
case isc_sockettype_unix:
sock->fd = socket(pf, SOCK_STREAM, 0);
break;
}
if (sock->fd == -1 && errno == EINTR && try++ < 42)
goto again;
#ifdef F_DUPFD
/*
* Leave a space for stdio and TCP to work in.
*/
if (manager->reserved != 0 && type == isc_sockettype_udp &&
sock->fd >= 0 && sock->fd < manager->reserved) {
int new, tmp;
new = fcntl(sock->fd, F_DUPFD, manager->reserved);
tmp = errno;
(void)close(sock->fd);
errno = tmp;
sock->fd = new;
err = "isc_socket_create: fcntl/reserved";
} else if (sock->fd >= 0 && sock->fd < 20) {
int new, tmp;
new = fcntl(sock->fd, F_DUPFD, 20);
tmp = errno;
(void)close(sock->fd);
errno = tmp;
sock->fd = new;
err = "isc_socket_create: fcntl";
}
#endif
if (sock->fd >= (int)manager->fdsize) {
(void)close(sock->fd);
isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_TOOMANYFDS,
"%s: too many open file descriptors", "socket");
free_socket(&sock);
return (ISC_R_NORESOURCES);
}
if (sock->fd < 0) {
free_socket(&sock);
switch (errno) {
case EMFILE:
case ENFILE:
case ENOBUFS:
return (ISC_R_NORESOURCES);
case EPROTONOSUPPORT:
case EPFNOSUPPORT:
case EAFNOSUPPORT:
/*
* Linux 2.2 (and maybe others) return EINVAL instead of
* EAFNOSUPPORT.
*/
case EINVAL:
return (ISC_R_FAMILYNOSUPPORT);
default:
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"%s() %s: %s", err,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
return (ISC_R_UNEXPECTED);
}
}
if (make_nonblock(sock->fd) != ISC_R_SUCCESS) {
(void)close(sock->fd);
free_socket(&sock);
return (ISC_R_UNEXPECTED);
}
#ifdef SO_BSDCOMPAT
RUNTIME_CHECK(isc_once_do(&bsdcompat_once,
clear_bsdcompat) == ISC_R_SUCCESS);
if (type != isc_sockettype_unix && bsdcompat &&
setsockopt(sock->fd, SOL_SOCKET, SO_BSDCOMPAT,
(void *)&on, sizeof(on)) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d, SO_BSDCOMPAT) %s: %s",
sock->fd,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"),
strbuf);
/* Press on... */
}
#endif
#if defined(USE_CMSG) || defined(SO_RCVBUF)
if (type == isc_sockettype_udp) {
#if defined(USE_CMSG)
#if defined(SO_TIMESTAMP)
if (setsockopt(sock->fd, SOL_SOCKET, SO_TIMESTAMP,
(void *)&on, sizeof(on)) < 0
&& errno != ENOPROTOOPT) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d, SO_TIMESTAMP) %s: %s",
sock->fd,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
/* Press on... */
}
#endif /* SO_TIMESTAMP */
#if defined(ISC_PLATFORM_HAVEIPV6)
if (pf == AF_INET6 && sock->recvcmsgbuflen == 0U) {
/*
* Warn explicitly because this anomaly can be hidden
* in usual operation (and unexpectedly appear later).
*/
UNEXPECTED_ERROR(__FILE__, __LINE__,
"No buffer available to receive "
"IPv6 destination");
}
#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
#ifdef IPV6_RECVPKTINFO
/* RFC 3542 */
if ((pf == AF_INET6)
&& (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
(void *)&on, sizeof(on)) < 0)) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d, IPV6_RECVPKTINFO) "
"%s: %s", sock->fd,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
}
#else
/* RFC 2292 */
if ((pf == AF_INET6)
&& (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_PKTINFO,
(void *)&on, sizeof(on)) < 0)) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d, IPV6_PKTINFO) %s: %s",
sock->fd,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
}
#endif /* IPV6_RECVPKTINFO */
#endif /* ISC_PLATFORM_HAVEIN6PKTINFO */
#ifdef IPV6_USE_MIN_MTU /* RFC 3542, not too common yet*/
/* use minimum MTU */
if (pf == AF_INET6) {
(void)setsockopt(sock->fd, IPPROTO_IPV6,
IPV6_USE_MIN_MTU,
(void *)&on, sizeof(on));
}
#endif
#endif /* ISC_PLATFORM_HAVEIPV6 */
#endif /* defined(USE_CMSG) */
#if defined(SO_RCVBUF)
optlen = sizeof(size);
if (getsockopt(sock->fd, SOL_SOCKET, SO_RCVBUF,
(void *)&size, &optlen) >= 0 &&
size < RCVBUFSIZE) {
size = RCVBUFSIZE;
if (setsockopt(sock->fd, SOL_SOCKET, SO_RCVBUF,
(void *)&size, sizeof(size)) == -1) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d, SO_RCVBUF, %d) %s: %s",
sock->fd, size,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
}
}
#endif
}
#endif /* defined(USE_CMSG) || defined(SO_RCVBUF) */
sock->references = 1;
*socketp = sock;
LOCK(&manager->lock);
/*
* Note we don't have to lock the socket like we normally would because
* there are no external references to it yet.
*/
manager->fds[sock->fd] = sock;
manager->fdstate[sock->fd] = MANAGED;
ISC_LIST_APPEND(manager->socklist, sock, link);
if (manager->maxfd < sock->fd)
manager->maxfd = sock->fd;
UNLOCK(&manager->lock);
socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_CREATED, "created");
return (ISC_R_SUCCESS);
}
/*
* Attach to a socket. Caller must explicitly detach when it is done.
*/
void
isc_socket_attach(isc_socket_t *sock, isc_socket_t **socketp) {
REQUIRE(VALID_SOCKET(sock));
REQUIRE(socketp != NULL && *socketp == NULL);
LOCK(&sock->lock);
sock->references++;
UNLOCK(&sock->lock);
*socketp = sock;
}
/*
* Dereference a socket. If this is the last reference to it, clean things
* up by destroying the socket.
*/
void
isc_socket_detach(isc_socket_t **socketp) {
isc_socket_t *sock;
isc_boolean_t kill_socket = ISC_FALSE;
REQUIRE(socketp != NULL);
sock = *socketp;
REQUIRE(VALID_SOCKET(sock));
LOCK(&sock->lock);
REQUIRE(sock->references > 0);
sock->references--;
if (sock->references == 0)
kill_socket = ISC_TRUE;
UNLOCK(&sock->lock);
if (kill_socket)
destroy(&sock);
*socketp = NULL;
}
/*
* I/O is possible on a given socket. Schedule an event to this task that
* will call an internal function to do the I/O. This will charge the
* task with the I/O operation and let our select loop handler get back
* to doing something real as fast as possible.
*
* The socket and manager must be locked before calling this function.
*/
static void
dispatch_recv(isc_socket_t *sock) {
intev_t *iev;
isc_socketevent_t *ev;
INSIST(!sock->pending_recv);
ev = ISC_LIST_HEAD(sock->recv_list);
if (ev == NULL)
return;
sock->pending_recv = 1;
iev = &sock->readable_ev;
socket_log(sock, NULL, EVENT, NULL, 0, 0,
"dispatch_recv: event %p -> task %p", ev, ev->ev_sender);
sock->references++;
iev->ev_sender = sock;
iev->ev_action = internal_recv;
iev->ev_arg = sock;
isc_task_send(ev->ev_sender, (isc_event_t **)&iev);
}
static void
dispatch_send(isc_socket_t *sock) {
intev_t *iev;
isc_socketevent_t *ev;
INSIST(!sock->pending_send);
ev = ISC_LIST_HEAD(sock->send_list);
if (ev == NULL)
return;
sock->pending_send = 1;
iev = &sock->writable_ev;
socket_log(sock, NULL, EVENT, NULL, 0, 0,
"dispatch_send: event %p -> task %p", ev, ev->ev_sender);
sock->references++;
iev->ev_sender = sock;
iev->ev_action = internal_send;
iev->ev_arg = sock;
isc_task_send(ev->ev_sender, (isc_event_t **)&iev);
}
/*
* Dispatch an internal accept event.
*/
static void
dispatch_accept(isc_socket_t *sock) {
intev_t *iev;
isc_socket_newconnev_t *ev;
INSIST(!sock->pending_accept);
/*
* Are there any done events left, or were they all canceled
* before the manager got the socket lock?
*/
ev = ISC_LIST_HEAD(sock->accept_list);
if (ev == NULL)
return;
sock->pending_accept = 1;
iev = &sock->readable_ev;
sock->references++; /* keep socket around for this internal event */
iev->ev_sender = sock;
iev->ev_action = internal_accept;
iev->ev_arg = sock;
isc_task_send(ev->ev_sender, (isc_event_t **)&iev);
}
static void
dispatch_connect(isc_socket_t *sock) {
intev_t *iev;
isc_socket_connev_t *ev;
iev = &sock->writable_ev;
ev = sock->connect_ev;
INSIST(ev != NULL); /* XXX */
INSIST(sock->connecting);
sock->references++; /* keep socket around for this internal event */
iev->ev_sender = sock;
iev->ev_action = internal_connect;
iev->ev_arg = sock;
isc_task_send(ev->ev_sender, (isc_event_t **)&iev);
}
/*
* Dequeue an item off the given socket's read queue, set the result code
* in the done event to the one provided, and send it to the task it was
* destined for.
*
* If the event to be sent is on a list, remove it before sending. If
* asked to, send and detach from the socket as well.
*
* Caller must have the socket locked if the event is attached to the socket.
*/
static void
send_recvdone_event(isc_socket_t *sock, isc_socketevent_t **dev) {
isc_task_t *task;
task = (*dev)->ev_sender;
(*dev)->ev_sender = sock;
if (ISC_LINK_LINKED(*dev, ev_link))
ISC_LIST_DEQUEUE(sock->recv_list, *dev, ev_link);
if (((*dev)->attributes & ISC_SOCKEVENTATTR_ATTACHED)
== ISC_SOCKEVENTATTR_ATTACHED)
isc_task_sendanddetach(&task, (isc_event_t **)dev);
else
isc_task_send(task, (isc_event_t **)dev);
}
/*
* See comments for send_recvdone_event() above.
*
* Caller must have the socket locked if the event is attached to the socket.
*/
static void
send_senddone_event(isc_socket_t *sock, isc_socketevent_t **dev) {
isc_task_t *task;
INSIST(dev != NULL && *dev != NULL);
task = (*dev)->ev_sender;
(*dev)->ev_sender = sock;
if (ISC_LINK_LINKED(*dev, ev_link))
ISC_LIST_DEQUEUE(sock->send_list, *dev, ev_link);
if (((*dev)->attributes & ISC_SOCKEVENTATTR_ATTACHED)
== ISC_SOCKEVENTATTR_ATTACHED)
isc_task_sendanddetach(&task, (isc_event_t **)dev);
else
isc_task_send(task, (isc_event_t **)dev);
}
/*
* Call accept() on a socket, to get the new file descriptor. The listen
* socket is used as a prototype to create a new isc_socket_t. The new
* socket has one outstanding reference. The task receiving the event
* will be detached from just after the event is delivered.
*
* On entry to this function, the event delivered is the internal
* readable event, and the first item on the accept_list should be
* the done event we want to send. If the list is empty, this is a no-op,
* so just unlock and return.
*/
static void
internal_accept(isc_task_t *me, isc_event_t *ev) {
isc_socket_t *sock;
isc_socketmgr_t *manager;
isc_socket_newconnev_t *dev;
isc_task_t *task;
ISC_SOCKADDR_LEN_T addrlen;
int fd;
isc_result_t result = ISC_R_SUCCESS;
char strbuf[ISC_STRERRORSIZE];
const char *err = "accept";
UNUSED(me);
sock = ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
socket_log(sock, NULL, TRACE,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_ACCEPTLOCK,
"internal_accept called, locked socket");
manager = sock->manager;
INSIST(VALID_MANAGER(manager));
INSIST(sock->listener);
INSIST(sock->pending_accept == 1);
sock->pending_accept = 0;
INSIST(sock->references > 0);
sock->references--; /* the internal event is done with this socket */
if (sock->references == 0) {
UNLOCK(&sock->lock);
destroy(&sock);
return;
}
/*
* Get the first item off the accept list.
* If it is empty, unlock the socket and return.
*/
dev = ISC_LIST_HEAD(sock->accept_list);
if (dev == NULL) {
UNLOCK(&sock->lock);
return;
}
/*
* Try to accept the new connection. If the accept fails with
* EAGAIN or EINTR, simply poke the watcher to watch this socket
* again. Also ignore ECONNRESET, which has been reported to
* be spuriously returned on Linux 2.2.19 although it is not
* a documented error for accept(). ECONNABORTED has been
* reported for Solaris 8. The rest are thrown in not because
* we have seen them but because they are ignored by other
* deamons such as BIND 8 and Apache.
*/
addrlen = sizeof(dev->newsocket->address.type);
memset(&dev->newsocket->address.type.sa, 0, addrlen);
fd = accept(sock->fd, &dev->newsocket->address.type.sa,
(void *)&addrlen);
#ifdef F_DUPFD
/*
* Leave a space for stdio to work in.
*/
if (fd >= 0 && fd < 20) {
int new, tmp;
new = fcntl(fd, F_DUPFD, 20);
tmp = errno;
(void)close(fd);
errno = tmp;
fd = new;
err = "accept/fcntl";
}
#endif
if (fd < 0) {
if (SOFT_ERROR(errno))
goto soft_error;
switch (errno) {
case ENFILE:
case EMFILE:
isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_TOOMANYFDS,
"%s: too many open file descriptors",
err);
goto soft_error;
case ENOBUFS:
case ENOMEM:
case ECONNRESET:
case ECONNABORTED:
case EHOSTUNREACH:
case EHOSTDOWN:
case ENETUNREACH:
case ENETDOWN:
case ECONNREFUSED:
#ifdef EPROTO
case EPROTO:
#endif
#ifdef ENONET
case ENONET:
#endif
goto soft_error;
default:
break;
}
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_accept: %s() %s: %s", err,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
fd = -1;
result = ISC_R_UNEXPECTED;
} else {
if (addrlen == 0U) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_accept(): "
"accept() failed to return "
"remote address");
(void)close(fd);
goto soft_error;
} else if (dev->newsocket->address.type.sa.sa_family !=
sock->pf)
{
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_accept(): "
"accept() returned peer address "
"family %u (expected %u)",
dev->newsocket->address.
type.sa.sa_family,
sock->pf);
(void)close(fd);
goto soft_error;
} else if (fd >= (int)manager->fdsize) {
isc_log_iwrite(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_TOOMANYFDS,
"%s: too many open file descriptors",
"accept");
(void)close(fd);
goto soft_error;
}
}
if (fd != -1) {
dev->newsocket->address.length = addrlen;
dev->newsocket->pf = sock->pf;
}
/*
* Pull off the done event.
*/
ISC_LIST_UNLINK(sock->accept_list, dev, ev_link);
/*
* Poke watcher if there are more pending accepts.
*/
if (!ISC_LIST_EMPTY(sock->accept_list))
select_poke(sock->manager, sock->fd, SELECT_POKE_ACCEPT);
UNLOCK(&sock->lock);
if (fd != -1 && (make_nonblock(fd) != ISC_R_SUCCESS)) {
(void)close(fd);
fd = -1;
result = ISC_R_UNEXPECTED;
}
/*
* -1 means the new socket didn't happen.
*/
if (fd != -1) {
LOCK(&manager->lock);
ISC_LIST_APPEND(manager->socklist, dev->newsocket, link);
dev->newsocket->fd = fd;
dev->newsocket->bound = 1;
dev->newsocket->connected = 1;
/*
* Save away the remote address
*/
dev->address = dev->newsocket->address;
manager->fds[fd] = dev->newsocket;
manager->fdstate[fd] = MANAGED;
if (manager->maxfd < fd)
manager->maxfd = fd;
socket_log(sock, &dev->newsocket->address, CREATION,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_ACCEPTEDCXN,
"accepted connection, new socket %p",
dev->newsocket);
UNLOCK(&manager->lock);
} else {
dev->newsocket->references--;
free_socket(&dev->newsocket);
}
/*
* Fill in the done event details and send it off.
*/
dev->result = result;
task = dev->ev_sender;
dev->ev_sender = sock;
isc_task_sendanddetach(&task, ISC_EVENT_PTR(&dev));
return;
soft_error:
select_poke(sock->manager, sock->fd, SELECT_POKE_ACCEPT);
UNLOCK(&sock->lock);
return;
}
static void
internal_recv(isc_task_t *me, isc_event_t *ev) {
isc_socketevent_t *dev;
isc_socket_t *sock;
INSIST(ev->ev_type == ISC_SOCKEVENT_INTR);
sock = ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
socket_log(sock, NULL, IOEVENT,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_INTERNALRECV,
"internal_recv: task %p got event %p", me, ev);
INSIST(sock->pending_recv == 1);
sock->pending_recv = 0;
INSIST(sock->references > 0);
sock->references--; /* the internal event is done with this socket */
if (sock->references == 0) {
UNLOCK(&sock->lock);
destroy(&sock);
return;
}
/*
* Try to do as much I/O as possible on this socket. There are no
* limits here, currently.
*/
dev = ISC_LIST_HEAD(sock->recv_list);
while (dev != NULL) {
switch (doio_recv(sock, dev)) {
case DOIO_SOFT:
goto poke;
case DOIO_EOF:
/*
* read of 0 means the remote end was closed.
* Run through the event queue and dispatch all
* the events with an EOF result code.
*/
do {
dev->result = ISC_R_EOF;
send_recvdone_event(sock, &dev);
dev = ISC_LIST_HEAD(sock->recv_list);
} while (dev != NULL);
goto poke;
case DOIO_SUCCESS:
case DOIO_HARD:
send_recvdone_event(sock, &dev);
break;
}
dev = ISC_LIST_HEAD(sock->recv_list);
}
poke:
if (!ISC_LIST_EMPTY(sock->recv_list))
select_poke(sock->manager, sock->fd, SELECT_POKE_READ);
UNLOCK(&sock->lock);
}
static void
internal_send(isc_task_t *me, isc_event_t *ev) {
isc_socketevent_t *dev;
isc_socket_t *sock;
INSIST(ev->ev_type == ISC_SOCKEVENT_INTW);
/*
* Find out what socket this is and lock it.
*/
sock = (isc_socket_t *)ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
socket_log(sock, NULL, IOEVENT,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_INTERNALSEND,
"internal_send: task %p got event %p", me, ev);
INSIST(sock->pending_send == 1);
sock->pending_send = 0;
INSIST(sock->references > 0);
sock->references--; /* the internal event is done with this socket */
if (sock->references == 0) {
UNLOCK(&sock->lock);
destroy(&sock);
return;
}
/*
* Try to do as much I/O as possible on this socket. There are no
* limits here, currently.
*/
dev = ISC_LIST_HEAD(sock->send_list);
while (dev != NULL) {
switch (doio_send(sock, dev)) {
case DOIO_SOFT:
goto poke;
case DOIO_HARD:
case DOIO_SUCCESS:
send_senddone_event(sock, &dev);
break;
}
dev = ISC_LIST_HEAD(sock->send_list);
}
poke:
if (!ISC_LIST_EMPTY(sock->send_list))
select_poke(sock->manager, sock->fd, SELECT_POKE_WRITE);
UNLOCK(&sock->lock);
}
static void
process_fds(isc_socketmgr_t *manager, int maxfd,
fd_set *readfds, fd_set *writefds)
{
int i;
isc_socket_t *sock;
isc_boolean_t unlock_sock;
REQUIRE(maxfd <= (int)manager->fdsize);
/*
* Process read/writes on other fds here. Avoid locking
* and unlocking twice if both reads and writes are possible.
*/
for (i = 0; i < maxfd; i++) {
#ifdef ISC_PLATFORM_USETHREADS
if (i == manager->pipe_fds[0] || i == manager->pipe_fds[1])
continue;
#endif /* ISC_PLATFORM_USETHREADS */
if (manager->fdstate[i] == CLOSE_PENDING) {
manager->fdstate[i] = CLOSED;
FD_CLR(i, manager->read_fds);
FD_CLR(i, manager->write_fds);
(void)close(i);
continue;
}
sock = manager->fds[i];
unlock_sock = ISC_FALSE;
if (FD_ISSET(i, readfds)) {
if (sock == NULL) {
FD_CLR(i, manager->read_fds);
goto check_write;
}
unlock_sock = ISC_TRUE;
LOCK(&sock->lock);
if (!SOCK_DEAD(sock)) {
if (sock->listener)
dispatch_accept(sock);
else
dispatch_recv(sock);
}
FD_CLR(i, manager->read_fds);
}
check_write:
if (FD_ISSET(i, writefds)) {
if (sock == NULL) {
FD_CLR(i, manager->write_fds);
continue;
}
if (!unlock_sock) {
unlock_sock = ISC_TRUE;
LOCK(&sock->lock);
}
if (!SOCK_DEAD(sock)) {
if (sock->connecting)
dispatch_connect(sock);
else
dispatch_send(sock);
}
FD_CLR(i, manager->write_fds);
}
if (unlock_sock)
UNLOCK(&sock->lock);
}
}
#ifdef ISC_PLATFORM_USETHREADS
/*
* This is the thread that will loop forever, always in a select or poll
* call.
*
* When select returns something to do, track down what thread gets to do
* this I/O and post the event to it.
*/
static isc_threadresult_t
watcher(void *uap) {
isc_socketmgr_t *manager = uap;
isc_boolean_t done;
int ctlfd;
int cc;
int msg, fd;
int maxfd;
char strbuf[ISC_STRERRORSIZE];
/*
* Get the control fd here. This will never change.
*/
LOCK(&manager->lock);
ctlfd = manager->pipe_fds[0];
done = ISC_FALSE;
while (!done) {
do {
memcpy(manager->read_fds_copy, manager->read_fds,
manager->fd_bufsize);
memcpy(manager->write_fds_copy, manager->write_fds,
manager->fd_bufsize);
maxfd = manager->maxfd + 1;
UNLOCK(&manager->lock);
cc = select(maxfd, manager->read_fds_copy,
manager->write_fds_copy, NULL, NULL);
if (cc < 0) {
if (!SOFT_ERROR(errno)) {
isc__strerror(errno, strbuf,
sizeof(strbuf));
FATAL_ERROR(__FILE__, __LINE__,
"select() %s: %s",
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_GENERAL,
ISC_MSG_FAILED,
"failed"),
strbuf);
}
}
LOCK(&manager->lock);
} while (cc < 0);
/*
* Process reads on internal, control fd.
*/
if (FD_ISSET(ctlfd, manager->read_fds_copy)) {
for (;;) {
select_readmsg(manager, &fd, &msg);
manager_log(manager, IOEVENT,
isc_msgcat_get(isc_msgcat,
ISC_MSGSET_SOCKET,
ISC_MSG_WATCHERMSG,
"watcher got message %d"),
msg);
/*
* Nothing to read?
*/
if (msg == SELECT_POKE_NOTHING)
break;
/*
* Handle shutdown message. We really should
* jump out of this loop right away, but
* it doesn't matter if we have to do a little
* more work first.
*/
if (msg == SELECT_POKE_SHUTDOWN) {
done = ISC_TRUE;
break;
}
/*
* This is a wakeup on a socket. Look
* at the event queue for both read and write,
* and decide if we need to watch on it now
* or not.
*/
wakeup_socket(manager, fd, msg);
}
}
process_fds(manager, maxfd, manager->read_fds_copy,
manager->write_fds_copy);
}
manager_log(manager, TRACE,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_EXITING, "watcher exiting"));
UNLOCK(&manager->lock);
return ((isc_threadresult_t)0);
}
#endif /* ISC_PLATFORM_USETHREADS */
void
isc__socketmgr_setreserved(isc_socketmgr_t *manager, isc_uint32_t reserved) {
REQUIRE(VALID_MANAGER(manager));
manager->reserved = reserved;
}
/*
* Initialize fdsets in socketmgr structure.
*/
static isc_result_t
create_fdsets(isc_socketmgr_t *manager, isc_mem_t *mctx) {
#if ISC_SOCKET_FDSETSIZE > FD_SETSIZE
manager->fdsize = ISC_SOCKET_FDSETSIZE;
manager->fd_bufsize = howmany(ISC_SOCKET_FDSETSIZE, NFDBITS) *
sizeof(fd_mask);
#else
manager->fdsize = FD_SETSIZE;
manager->fd_bufsize = sizeof(fd_set);
#endif
manager->fds = NULL;
manager->fdstate = NULL;
manager->read_fds = NULL;
manager->read_fds_copy = NULL;
manager->write_fds = NULL;
manager->write_fds_copy = NULL;
manager->fds = isc_mem_get(mctx,
manager->fdsize * sizeof(manager->fds[0]));
if (manager->fds == NULL)
goto fail;
manager->fdstate = isc_mem_get(mctx, manager->fdsize *
sizeof(manager->fdstate[0]));
if (manager->fdstate == NULL)
goto fail;
manager->read_fds = isc_mem_get(mctx, manager->fd_bufsize);
if (manager->read_fds == NULL)
goto fail;
manager->read_fds_copy = isc_mem_get(mctx, manager->fd_bufsize);
if (manager->read_fds_copy == NULL)
goto fail;
manager->write_fds = isc_mem_get(mctx, manager->fd_bufsize);
if (manager->write_fds == NULL)
goto fail;
manager->write_fds_copy = isc_mem_get(mctx, manager->fd_bufsize);
if (manager->write_fds_copy == NULL)
goto fail;
return (ISC_R_SUCCESS);
fail:
cleanup_fdsets(manager, mctx);
return (ISC_R_NOMEMORY);
}
/*
* Clean up fdsets in socketmgr structure.
*/
static void
cleanup_fdsets(isc_socketmgr_t *manager, isc_mem_t *mctx) {
if (manager->fds != NULL) {
isc_mem_put(mctx, manager->fds,
manager->fdsize * sizeof(manager->fds[0]));
}
if (manager->fdstate != NULL) {
isc_mem_put(mctx, manager->fdstate,
manager->fdsize * sizeof(manager->fdstate[0]));
}
if (manager->read_fds != NULL)
isc_mem_put(mctx, manager->read_fds, manager->fd_bufsize);
if (manager->read_fds_copy != NULL)
isc_mem_put(mctx, manager->read_fds_copy, manager->fd_bufsize);
if (manager->write_fds != NULL)
isc_mem_put(mctx, manager->write_fds, manager->fd_bufsize);
if (manager->write_fds_copy != NULL)
isc_mem_put(mctx, manager->write_fds_copy, manager->fd_bufsize);
}
/*
* Create a new socket manager.
*/
isc_result_t
isc_socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp) {
isc_socketmgr_t *manager;
#ifdef ISC_PLATFORM_USETHREADS
char strbuf[ISC_STRERRORSIZE];
#endif
isc_result_t result;
REQUIRE(managerp != NULL && *managerp == NULL);
#ifndef ISC_PLATFORM_USETHREADS
if (socketmgr != NULL) {
socketmgr->refs++;
*managerp = socketmgr;
return (ISC_R_SUCCESS);
}
#endif /* ISC_PLATFORM_USETHREADS */
manager = isc_mem_get(mctx, sizeof(*manager));
if (manager == NULL)
return (ISC_R_NOMEMORY);
result = create_fdsets(manager, mctx);
if (result != ISC_R_SUCCESS) {
cleanup_fdsets(manager, mctx);
isc_mem_put(mctx, manager, sizeof(*manager));
return (result);
}
manager->magic = SOCKET_MANAGER_MAGIC;
manager->mctx = NULL;
memset(manager->fds, 0, sizeof(manager->fds[0]) * manager->fdsize);
ISC_LIST_INIT(manager->socklist);
result = isc_mutex_init(&manager->lock);
if (result != ISC_R_SUCCESS) {
cleanup_fdsets(manager, mctx);
isc_mem_put(mctx, manager, sizeof(*manager));
return (result);
}
#ifdef ISC_PLATFORM_USETHREADS
if (isc_condition_init(&manager->shutdown_ok) != ISC_R_SUCCESS) {
cleanup_fdsets(manager, mctx);
DESTROYLOCK(&manager->lock);
isc_mem_put(mctx, manager, sizeof(*manager));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_condition_init() %s",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"));
return (ISC_R_UNEXPECTED);
}
/*
* Create the special fds that will be used to wake up the
* select/poll loop when something internal needs to be done.
*/
if (pipe(manager->pipe_fds) != 0) {
cleanup_fdsets(manager, mctx);
DESTROYLOCK(&manager->lock);
isc_mem_put(mctx, manager, sizeof(*manager));
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"pipe() %s: %s",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"),
strbuf);
return (ISC_R_UNEXPECTED);
}
RUNTIME_CHECK(make_nonblock(manager->pipe_fds[0]) == ISC_R_SUCCESS);
#if 0
RUNTIME_CHECK(make_nonblock(manager->pipe_fds[1]) == ISC_R_SUCCESS);
#endif
#else /* ISC_PLATFORM_USETHREADS */
manager->refs = 1;
#endif /* ISC_PLATFORM_USETHREADS */
/*
* Set up initial state for the select loop
*/
memset(manager->read_fds, 0, manager->fd_bufsize);
memset(manager->write_fds, 0, manager->fd_bufsize);
#ifdef ISC_PLATFORM_USETHREADS
FD_SET(manager->pipe_fds[0], manager->read_fds);
manager->maxfd = manager->pipe_fds[0];
#else /* ISC_PLATFORM_USETHREADS */
manager->maxfd = 0;
#endif /* ISC_PLATFORM_USETHREADS */
manager->reserved = 0;
memset(manager->fdstate, 0,
manager->fdsize * sizeof(manager->fdstate[0]));
#ifdef ISC_PLATFORM_USETHREADS
/*
* Start up the select/poll thread.
*/
if (isc_thread_create(watcher, manager, &manager->watcher) !=
ISC_R_SUCCESS) {
(void)close(manager->pipe_fds[0]);
(void)close(manager->pipe_fds[1]);
DESTROYLOCK(&manager->lock);
isc_mem_put(mctx, manager, sizeof(*manager));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_thread_create() %s",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"));
return (ISC_R_UNEXPECTED);
}
#endif /* ISC_PLATFORM_USETHREADS */
isc_mem_attach(mctx, &manager->mctx);
#ifndef ISC_PLATFORM_USETHREADS
socketmgr = manager;
#endif /* ISC_PLATFORM_USETHREADS */
*managerp = manager;
return (ISC_R_SUCCESS);
}
void
isc_socketmgr_destroy(isc_socketmgr_t **managerp) {
isc_socketmgr_t *manager;
int i;
isc_mem_t *mctx;
/*
* Destroy a socket manager.
*/
REQUIRE(managerp != NULL);
manager = *managerp;
REQUIRE(VALID_MANAGER(manager));
#ifndef ISC_PLATFORM_USETHREADS
if (manager->refs > 1) {
manager->refs--;
*managerp = NULL;
return;
}
#endif /* ISC_PLATFORM_USETHREADS */
LOCK(&manager->lock);
#ifdef ISC_PLATFORM_USETHREADS
/*
* Wait for all sockets to be destroyed.
*/
while (!ISC_LIST_EMPTY(manager->socklist)) {
manager_log(manager, CREATION,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_SOCKETSREMAIN,
"sockets exist"));
WAIT(&manager->shutdown_ok, &manager->lock);
}
#else /* ISC_PLATFORM_USETHREADS */
/*
* Hope all sockets have been destroyed.
*/
if (!ISC_LIST_EMPTY(manager->socklist)) {
manager_log(manager, CREATION,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_SOCKETSREMAIN,
"sockets exist"));
INSIST(0);
}
#endif /* ISC_PLATFORM_USETHREADS */
UNLOCK(&manager->lock);
/*
* Here, poke our select/poll thread. Do this by closing the write
* half of the pipe, which will send EOF to the read half.
* This is currently a no-op in the non-threaded case.
*/
select_poke(manager, 0, SELECT_POKE_SHUTDOWN);
#ifdef ISC_PLATFORM_USETHREADS
/*
* Wait for thread to exit.
*/
if (isc_thread_join(manager->watcher, NULL) != ISC_R_SUCCESS)
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_thread_join() %s",
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"));
#endif /* ISC_PLATFORM_USETHREADS */
/*
* Clean up.
*/
#ifdef ISC_PLATFORM_USETHREADS
(void)close(manager->pipe_fds[0]);
(void)close(manager->pipe_fds[1]);
(void)isc_condition_destroy(&manager->shutdown_ok);
#endif /* ISC_PLATFORM_USETHREADS */
for (i = 0; i < (int)manager->fdsize; i++)
if (manager->fdstate[i] == CLOSE_PENDING)
(void)close(i);
DESTROYLOCK(&manager->lock);
cleanup_fdsets(manager, manager->mctx);
manager->magic = 0;
mctx= manager->mctx;
isc_mem_put(mctx, manager, sizeof(*manager));
isc_mem_detach(&mctx);
*managerp = NULL;
}
static isc_result_t
socket_recv(isc_socket_t *sock, isc_socketevent_t *dev, isc_task_t *task,
unsigned int flags)
{
int io_state;
isc_boolean_t have_lock = ISC_FALSE;
isc_task_t *ntask = NULL;
isc_result_t result = ISC_R_SUCCESS;
dev->ev_sender = task;
if (sock->type == isc_sockettype_udp) {
io_state = doio_recv(sock, dev);
} else {
LOCK(&sock->lock);
have_lock = ISC_TRUE;
if (ISC_LIST_EMPTY(sock->recv_list))
io_state = doio_recv(sock, dev);
else
io_state = DOIO_SOFT;
}
switch (io_state) {
case DOIO_SOFT:
/*
* We couldn't read all or part of the request right now, so
* queue it.
*
* Attach to socket and to task
*/
isc_task_attach(task, &ntask);
dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
if (!have_lock) {
LOCK(&sock->lock);
have_lock = ISC_TRUE;
}
/*
* Enqueue the request. If the socket was previously not being
* watched, poke the watcher to start paying attention to it.
*/
if (ISC_LIST_EMPTY(sock->recv_list))
select_poke(sock->manager, sock->fd, SELECT_POKE_READ);
ISC_LIST_ENQUEUE(sock->recv_list, dev, ev_link);
socket_log(sock, NULL, EVENT, NULL, 0, 0,
"socket_recv: event %p -> task %p",
dev, ntask);
if ((flags & ISC_SOCKFLAG_IMMEDIATE) != 0)
result = ISC_R_INPROGRESS;
break;
case DOIO_EOF:
dev->result = ISC_R_EOF;
/* fallthrough */
case DOIO_HARD:
case DOIO_SUCCESS:
if ((flags & ISC_SOCKFLAG_IMMEDIATE) == 0)
send_recvdone_event(sock, &dev);
break;
}
if (have_lock)
UNLOCK(&sock->lock);
return (result);
}
isc_result_t
isc_socket_recvv(isc_socket_t *sock, isc_bufferlist_t *buflist,
unsigned int minimum, isc_task_t *task,
isc_taskaction_t action, const void *arg)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
unsigned int iocount;
isc_buffer_t *buffer;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(buflist != NULL);
REQUIRE(!ISC_LIST_EMPTY(*buflist));
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
iocount = isc_bufferlist_availablecount(buflist);
REQUIRE(iocount > 0);
INSIST(sock->bound);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_RECVDONE, action, arg);
if (dev == NULL) {
return (ISC_R_NOMEMORY);
}
/*
* UDP sockets are always partial read
*/
if (sock->type == isc_sockettype_udp)
dev->minimum = 1;
else {
if (minimum == 0)
dev->minimum = iocount;
else
dev->minimum = minimum;
}
/*
* Move each buffer from the passed in list to our internal one.
*/
buffer = ISC_LIST_HEAD(*buflist);
while (buffer != NULL) {
ISC_LIST_DEQUEUE(*buflist, buffer, link);
ISC_LIST_ENQUEUE(dev->bufferlist, buffer, link);
buffer = ISC_LIST_HEAD(*buflist);
}
return (socket_recv(sock, dev, task, 0));
}
isc_result_t
isc_socket_recv(isc_socket_t *sock, isc_region_t *region, unsigned int minimum,
isc_task_t *task, isc_taskaction_t action, const void *arg)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
INSIST(sock->bound);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_RECVDONE, action, arg);
if (dev == NULL)
return (ISC_R_NOMEMORY);
return (isc_socket_recv2(sock, region, minimum, task, dev, 0));
}
isc_result_t
isc_socket_recv2(isc_socket_t *sock, isc_region_t *region,
unsigned int minimum, isc_task_t *task,
isc_socketevent_t *event, unsigned int flags)
{
event->ev_sender = sock;
event->result = ISC_R_UNEXPECTED;
ISC_LIST_INIT(event->bufferlist);
event->region = *region;
event->n = 0;
event->offset = 0;
event->attributes = 0;
/*
* UDP sockets are always partial read.
*/
if (sock->type == isc_sockettype_udp)
event->minimum = 1;
else {
if (minimum == 0)
event->minimum = region->length;
else
event->minimum = minimum;
}
return (socket_recv(sock, event, task, flags));
}
static isc_result_t
socket_send(isc_socket_t *sock, isc_socketevent_t *dev, isc_task_t *task,
isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
unsigned int flags)
{
int io_state;
isc_boolean_t have_lock = ISC_FALSE;
isc_task_t *ntask = NULL;
isc_result_t result = ISC_R_SUCCESS;
dev->ev_sender = task;
set_dev_address(address, sock, dev);
if (pktinfo != NULL) {
dev->attributes |= ISC_SOCKEVENTATTR_PKTINFO;
dev->pktinfo = *pktinfo;
if (!isc_sockaddr_issitelocal(&dev->address) &&
!isc_sockaddr_islinklocal(&dev->address)) {
socket_log(sock, NULL, TRACE, isc_msgcat,
ISC_MSGSET_SOCKET, ISC_MSG_PKTINFOPROVIDED,
"pktinfo structure provided, ifindex %u "
"(set to 0)", pktinfo->ipi6_ifindex);
/*
* Set the pktinfo index to 0 here, to let the
* kernel decide what interface it should send on.
*/
dev->pktinfo.ipi6_ifindex = 0;
}
}
if (sock->type == isc_sockettype_udp)
io_state = doio_send(sock, dev);
else {
LOCK(&sock->lock);
have_lock = ISC_TRUE;
if (ISC_LIST_EMPTY(sock->send_list))
io_state = doio_send(sock, dev);
else
io_state = DOIO_SOFT;
}
switch (io_state) {
case DOIO_SOFT:
/*
* We couldn't send all or part of the request right now, so
* queue it unless ISC_SOCKFLAG_NORETRY is set.
*/
if ((flags & ISC_SOCKFLAG_NORETRY) == 0) {
isc_task_attach(task, &ntask);
dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
if (!have_lock) {
LOCK(&sock->lock);
have_lock = ISC_TRUE;
}
/*
* Enqueue the request. If the socket was previously
* not being watched, poke the watcher to start
* paying attention to it.
*/
if (ISC_LIST_EMPTY(sock->send_list))
select_poke(sock->manager, sock->fd,
SELECT_POKE_WRITE);
ISC_LIST_ENQUEUE(sock->send_list, dev, ev_link);
socket_log(sock, NULL, EVENT, NULL, 0, 0,
"socket_send: event %p -> task %p",
dev, ntask);
if ((flags & ISC_SOCKFLAG_IMMEDIATE) != 0)
result = ISC_R_INPROGRESS;
break;
}
case DOIO_HARD:
case DOIO_SUCCESS:
if ((flags & ISC_SOCKFLAG_IMMEDIATE) == 0)
send_senddone_event(sock, &dev);
break;
}
if (have_lock)
UNLOCK(&sock->lock);
return (result);
}
isc_result_t
isc_socket_send(isc_socket_t *sock, isc_region_t *region,
isc_task_t *task, isc_taskaction_t action, const void *arg)
{
/*
* REQUIRE() checking is performed in isc_socket_sendto().
*/
return (isc_socket_sendto(sock, region, task, action, arg, NULL,
NULL));
}
isc_result_t
isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
isc_task_t *task, isc_taskaction_t action, const void *arg,
isc_sockaddr_t *address, struct in6_pktinfo *pktinfo)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(region != NULL);
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
INSIST(sock->bound);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_SENDDONE, action, arg);
if (dev == NULL) {
return (ISC_R_NOMEMORY);
}
dev->region = *region;
return (socket_send(sock, dev, task, address, pktinfo, 0));
}
isc_result_t
isc_socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
isc_task_t *task, isc_taskaction_t action, const void *arg)
{
return (isc_socket_sendtov(sock, buflist, task, action, arg, NULL,
NULL));
}
isc_result_t
isc_socket_sendtov(isc_socket_t *sock, isc_bufferlist_t *buflist,
isc_task_t *task, isc_taskaction_t action, const void *arg,
isc_sockaddr_t *address, struct in6_pktinfo *pktinfo)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
unsigned int iocount;
isc_buffer_t *buffer;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(buflist != NULL);
REQUIRE(!ISC_LIST_EMPTY(*buflist));
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
iocount = isc_bufferlist_usedcount(buflist);
REQUIRE(iocount > 0);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_SENDDONE, action, arg);
if (dev == NULL) {
return (ISC_R_NOMEMORY);
}
/*
* Move each buffer from the passed in list to our internal one.
*/
buffer = ISC_LIST_HEAD(*buflist);
while (buffer != NULL) {
ISC_LIST_DEQUEUE(*buflist, buffer, link);
ISC_LIST_ENQUEUE(dev->bufferlist, buffer, link);
buffer = ISC_LIST_HEAD(*buflist);
}
return (socket_send(sock, dev, task, address, pktinfo, 0));
}
isc_result_t
isc_socket_sendto2(isc_socket_t *sock, isc_region_t *region,
isc_task_t *task,
isc_sockaddr_t *address, struct in6_pktinfo *pktinfo,
isc_socketevent_t *event, unsigned int flags)
{
REQUIRE((flags & ~(ISC_SOCKFLAG_IMMEDIATE|ISC_SOCKFLAG_NORETRY)) == 0);
if ((flags & ISC_SOCKFLAG_NORETRY) != 0)
REQUIRE(sock->type == isc_sockettype_udp);
event->ev_sender = sock;
event->result = ISC_R_UNEXPECTED;
ISC_LIST_INIT(event->bufferlist);
event->region = *region;
event->n = 0;
event->offset = 0;
event->attributes = 0;
return (socket_send(sock, event, task, address, pktinfo, flags));
}
void
isc_socket_cleanunix(isc_sockaddr_t *sockaddr, isc_boolean_t active) {
#ifdef ISC_PLATFORM_HAVESYSUNH
int s;
struct stat sb;
char strbuf[ISC_STRERRORSIZE];
if (sockaddr->type.sa.sa_family != AF_UNIX)
return;
#ifndef S_ISSOCK
#if defined(S_IFMT) && defined(S_IFSOCK)
#define S_ISSOCK(mode) ((mode & S_IFMT)==S_IFSOCK)
#elif defined(_S_IFMT) && defined(S_IFSOCK)
#define S_ISSOCK(mode) ((mode & _S_IFMT)==S_IFSOCK)
#endif
#endif
#ifndef S_ISFIFO
#if defined(S_IFMT) && defined(S_IFIFO)
#define S_ISFIFO(mode) ((mode & S_IFMT)==S_IFIFO)
#elif defined(_S_IFMT) && defined(S_IFIFO)
#define S_ISFIFO(mode) ((mode & _S_IFMT)==S_IFIFO)
#endif
#endif
#if !defined(S_ISFIFO) && !defined(S_ISSOCK)
#error You need to define S_ISFIFO and S_ISSOCK as appropriate for your platform. See <sys/stat.h>.
#endif
#ifndef S_ISFIFO
#define S_ISFIFO(mode) 0
#endif
#ifndef S_ISSOCK
#define S_ISSOCK(mode) 0
#endif
if (active) {
if (stat(sockaddr->type.sunix.sun_path, &sb) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"isc_socket_cleanunix: stat(%s): %s",
sockaddr->type.sunix.sun_path, strbuf);
return;
}
if (!(S_ISSOCK(sb.st_mode) || S_ISFIFO(sb.st_mode))) {
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"isc_socket_cleanunix: %s: not a socket",
sockaddr->type.sunix.sun_path);
return;
}
if (unlink(sockaddr->type.sunix.sun_path) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"isc_socket_cleanunix: unlink(%s): %s",
sockaddr->type.sunix.sun_path, strbuf);
}
return;
}
s = socket(AF_UNIX, SOCK_STREAM, 0);
if (s < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
"isc_socket_cleanunix: socket(%s): %s",
sockaddr->type.sunix.sun_path, strbuf);
return;
}
if (stat(sockaddr->type.sunix.sun_path, &sb) < 0) {
switch (errno) {
case ENOENT: /* We exited cleanly last time */
break;
default:
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
"isc_socket_cleanunix: stat(%s): %s",
sockaddr->type.sunix.sun_path, strbuf);
break;
}
goto cleanup;
}
if (!(S_ISSOCK(sb.st_mode) || S_ISFIFO(sb.st_mode))) {
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
"isc_socket_cleanunix: %s: not a socket",
sockaddr->type.sunix.sun_path);
goto cleanup;
}
if (connect(s, (struct sockaddr *)&sockaddr->type.sunix,
sizeof(sockaddr->type.sunix)) < 0) {
switch (errno) {
case ECONNREFUSED:
case ECONNRESET:
if (unlink(sockaddr->type.sunix.sun_path) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET,
ISC_LOG_WARNING,
"isc_socket_cleanunix: "
"unlink(%s): %s",
sockaddr->type.sunix.sun_path,
strbuf);
}
break;
default:
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_WARNING,
"isc_socket_cleanunix: connect(%s): %s",
sockaddr->type.sunix.sun_path, strbuf);
break;
}
}
cleanup:
close(s);
#else
UNUSED(sockaddr);
UNUSED(active);
#endif
}
isc_result_t
isc_socket_permunix(isc_sockaddr_t *sockaddr, isc_uint32_t perm,
isc_uint32_t owner, isc_uint32_t group)
{
#ifdef ISC_PLATFORM_HAVESYSUNH
isc_result_t result = ISC_R_SUCCESS;
char strbuf[ISC_STRERRORSIZE];
char path[sizeof(sockaddr->type.sunix.sun_path)];
#ifdef NEED_SECURE_DIRECTORY
char *slash;
#endif
REQUIRE(sockaddr->type.sa.sa_family == AF_UNIX);
INSIST(strlen(sockaddr->type.sunix.sun_path) < sizeof(path));
strcpy(path, sockaddr->type.sunix.sun_path);
#ifdef NEED_SECURE_DIRECTORY
slash = strrchr(path, '/');
if (slash != NULL) {
if (slash != path)
*slash = '\0';
else
strcpy(path, "/");
} else
strcpy(path, ".");
#endif
if (chmod(path, perm) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"isc_socket_permunix: chmod(%s, %d): %s",
path, perm, strbuf);
result = ISC_R_FAILURE;
}
if (chown(path, owner, group) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
"isc_socket_permunix: chown(%s, %d, %d): %s",
path, owner, group,
strbuf);
result = ISC_R_FAILURE;
}
return (result);
#else
UNUSED(sockaddr);
UNUSED(perm);
UNUSED(owner);
UNUSED(group);
return (ISC_R_NOTIMPLEMENTED);
#endif
}
isc_result_t
isc_socket_bind(isc_socket_t *sock, isc_sockaddr_t *sockaddr,
unsigned int options) {
char strbuf[ISC_STRERRORSIZE];
int on = 1;
LOCK(&sock->lock);
INSIST(!sock->bound);
if (sock->pf != sockaddr->type.sa.sa_family) {
UNLOCK(&sock->lock);
return (ISC_R_FAMILYMISMATCH);
}
/*
* Only set SO_REUSEADDR when we want a specific port.
*/
#ifdef AF_UNIX
if (sock->pf == AF_UNIX)
goto bind_socket;
#endif
if ((options & ISC_SOCKET_REUSEADDRESS) != 0 &&
isc_sockaddr_getport(sockaddr) != (in_port_t)0 &&
setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on,
sizeof(on)) < 0) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d) %s", sock->fd,
isc_msgcat_get(isc_msgcat, ISC_MSGSET_GENERAL,
ISC_MSG_FAILED, "failed"));
/* Press on... */
}
#ifdef AF_UNIX
bind_socket:
#endif
if (bind(sock->fd, &sockaddr->type.sa, sockaddr->length) < 0) {
UNLOCK(&sock->lock);
switch (errno) {
case EACCES:
return (ISC_R_NOPERM);
case EADDRNOTAVAIL:
return (ISC_R_ADDRNOTAVAIL);
case EADDRINUSE:
return (ISC_R_ADDRINUSE);
case EINVAL:
return (ISC_R_BOUND);
default:
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__, "bind: %s",
strbuf);
return (ISC_R_UNEXPECTED);
}
}
socket_log(sock, sockaddr, TRACE,
isc_msgcat, ISC_MSGSET_SOCKET, ISC_MSG_BOUND, "bound");
sock->bound = 1;
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_filter(isc_socket_t *sock, const char *filter) {
#ifdef SO_ACCEPTFILTER
char strbuf[ISC_STRERRORSIZE];
struct accept_filter_arg afa;
#else
UNUSED(sock);
UNUSED(filter);
#endif
REQUIRE(VALID_SOCKET(sock));
#ifdef SO_ACCEPTFILTER
bzero(&afa, sizeof(afa));
strncpy(afa.af_name, filter, sizeof(afa.af_name));
if (setsockopt(sock->fd, SOL_SOCKET, SO_ACCEPTFILTER,
&afa, sizeof(afa)) == -1) {
isc__strerror(errno, strbuf, sizeof(strbuf));
socket_log(sock, NULL, CREATION, isc_msgcat, ISC_MSGSET_SOCKET,
ISC_MSG_FILTER, "setsockopt(SO_ACCEPTFILTER): %s",
strbuf);
return (ISC_R_FAILURE);
}
return (ISC_R_SUCCESS);
#else
return (ISC_R_NOTIMPLEMENTED);
#endif
}
/*
* Set up to listen on a given socket. We do this by creating an internal
* event that will be dispatched when the socket has read activity. The
* watcher will send the internal event to the task when there is a new
* connection.
*
* Unlike in read, we don't preallocate a done event here. Every time there
* is a new connection we'll have to allocate a new one anyway, so we might
* as well keep things simple rather than having to track them.
*/
isc_result_t
isc_socket_listen(isc_socket_t *sock, unsigned int backlog) {
char strbuf[ISC_STRERRORSIZE];
REQUIRE(VALID_SOCKET(sock));
LOCK(&sock->lock);
REQUIRE(!sock->listener);
REQUIRE(sock->bound);
REQUIRE(sock->type == isc_sockettype_tcp ||
sock->type == isc_sockettype_unix);
if (backlog == 0)
backlog = SOMAXCONN;
if (listen(sock->fd, (int)backlog) < 0) {
UNLOCK(&sock->lock);
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__, "listen: %s", strbuf);
return (ISC_R_UNEXPECTED);
}
sock->listener = 1;
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* This should try to do agressive accept() XXXMLG
*/
isc_result_t
isc_socket_accept(isc_socket_t *sock,
isc_task_t *task, isc_taskaction_t action, const void *arg)
{
isc_socket_newconnev_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
isc_socket_t *nsock;
isc_result_t result;
isc_boolean_t do_poke = ISC_FALSE;
REQUIRE(VALID_SOCKET(sock));
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
LOCK(&sock->lock);
REQUIRE(sock->listener);
/*
* Sender field is overloaded here with the task we will be sending
* this event to. Just before the actual event is delivered the
* actual ev_sender will be touched up to be the socket.
*/
dev = (isc_socket_newconnev_t *)
isc_event_allocate(manager->mctx, task, ISC_SOCKEVENT_NEWCONN,
action, arg, sizeof(*dev));
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
ISC_LINK_INIT(dev, ev_link);
result = allocate_socket(manager, sock->type, &nsock);
if (result != ISC_R_SUCCESS) {
isc_event_free(ISC_EVENT_PTR(&dev));
UNLOCK(&sock->lock);
return (result);
}
/*
* Attach to socket and to task.
*/
isc_task_attach(task, &ntask);
nsock->references++;
dev->ev_sender = ntask;
dev->newsocket = nsock;
/*
* Poke watcher here. We still have the socket locked, so there
* is no race condition. We will keep the lock for such a short
* bit of time waking it up now or later won't matter all that much.
*/
if (ISC_LIST_EMPTY(sock->accept_list))
do_poke = ISC_TRUE;
ISC_LIST_ENQUEUE(sock->accept_list, dev, ev_link);
if (do_poke)
select_poke(manager, sock->fd, SELECT_POKE_ACCEPT);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_connect(isc_socket_t *sock, isc_sockaddr_t *addr,
isc_task_t *task, isc_taskaction_t action, const void *arg)
{
isc_socket_connev_t *dev;
isc_task_t *ntask = NULL;
isc_socketmgr_t *manager;
int cc;
char strbuf[ISC_STRERRORSIZE];
REQUIRE(VALID_SOCKET(sock));
REQUIRE(addr != NULL);
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
REQUIRE(addr != NULL);
if (isc_sockaddr_ismulticast(addr))
return (ISC_R_MULTICAST);
LOCK(&sock->lock);
REQUIRE(!sock->connecting);
dev = (isc_socket_connev_t *)isc_event_allocate(manager->mctx, sock,
ISC_SOCKEVENT_CONNECT,
action, arg,
sizeof(*dev));
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
ISC_LINK_INIT(dev, ev_link);
/*
* Try to do the connect right away, as there can be only one
* outstanding, and it might happen to complete.
*/
sock->address = *addr;
cc = connect(sock->fd, &addr->type.sa, addr->length);
if (cc < 0) {
if (SOFT_ERROR(errno) || errno == EINPROGRESS)
goto queue;
switch (errno) {
#define ERROR_MATCH(a, b) case a: dev->result = b; goto err_exit;
ERROR_MATCH(EACCES, ISC_R_NOPERM);
ERROR_MATCH(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
ERROR_MATCH(EAFNOSUPPORT, ISC_R_ADDRNOTAVAIL);
ERROR_MATCH(ECONNREFUSED, ISC_R_CONNREFUSED);
ERROR_MATCH(EHOSTUNREACH, ISC_R_HOSTUNREACH);
#ifdef EHOSTDOWN
ERROR_MATCH(EHOSTDOWN, ISC_R_HOSTUNREACH);
#endif
ERROR_MATCH(ENETUNREACH, ISC_R_NETUNREACH);
ERROR_MATCH(ENOBUFS, ISC_R_NORESOURCES);
ERROR_MATCH(EPERM, ISC_R_HOSTUNREACH);
ERROR_MATCH(EPIPE, ISC_R_NOTCONNECTED);
ERROR_MATCH(ECONNRESET, ISC_R_CONNECTIONRESET);
#undef ERROR_MATCH
}
sock->connected = 0;
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__, "%d/%s", errno, strbuf);
UNLOCK(&sock->lock);
isc_event_free(ISC_EVENT_PTR(&dev));
return (ISC_R_UNEXPECTED);
err_exit:
sock->connected = 0;
isc_task_send(task, ISC_EVENT_PTR(&dev));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* If connect completed, fire off the done event.
*/
if (cc == 0) {
sock->connected = 1;
sock->bound = 1;
dev->result = ISC_R_SUCCESS;
isc_task_send(task, ISC_EVENT_PTR(&dev));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
queue:
/*
* Attach to task.
*/
isc_task_attach(task, &ntask);
sock->connecting = 1;
dev->ev_sender = ntask;
/*
* Poke watcher here. We still have the socket locked, so there
* is no race condition. We will keep the lock for such a short
* bit of time waking it up now or later won't matter all that much.
*/
if (sock->connect_ev == NULL)
select_poke(manager, sock->fd, SELECT_POKE_CONNECT);
sock->connect_ev = dev;
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* Called when a socket with a pending connect() finishes.
*/
static void
internal_connect(isc_task_t *me, isc_event_t *ev) {
isc_socket_t *sock;
isc_socket_connev_t *dev;
isc_task_t *task;
int cc;
ISC_SOCKADDR_LEN_T optlen;
char strbuf[ISC_STRERRORSIZE];
char peerbuf[ISC_SOCKADDR_FORMATSIZE];
UNUSED(me);
INSIST(ev->ev_type == ISC_SOCKEVENT_INTW);
sock = ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
/*
* When the internal event was sent the reference count was bumped
* to keep the socket around for us. Decrement the count here.
*/
INSIST(sock->references > 0);
sock->references--;
if (sock->references == 0) {
UNLOCK(&sock->lock);
destroy(&sock);
return;
}
/*
* Has this event been canceled?
*/
dev = sock->connect_ev;
if (dev == NULL) {
INSIST(!sock->connecting);
UNLOCK(&sock->lock);
return;
}
INSIST(sock->connecting);
sock->connecting = 0;
/*
* Get any possible error status here.
*/
optlen = sizeof(cc);
if (getsockopt(sock->fd, SOL_SOCKET, SO_ERROR,
(void *)&cc, (void *)&optlen) < 0)
cc = errno;
else
errno = cc;
if (errno != 0) {
/*
* If the error is EAGAIN, just re-select on this
* fd and pretend nothing strange happened.
*/
if (SOFT_ERROR(errno) || errno == EINPROGRESS) {
sock->connecting = 1;
select_poke(sock->manager, sock->fd,
SELECT_POKE_CONNECT);
UNLOCK(&sock->lock);
return;
}
/*
* Translate other errors into ISC_R_* flavors.
*/
switch (errno) {
#define ERROR_MATCH(a, b) case a: dev->result = b; break;
ERROR_MATCH(EACCES, ISC_R_NOPERM);
ERROR_MATCH(EADDRNOTAVAIL, ISC_R_ADDRNOTAVAIL);
ERROR_MATCH(EAFNOSUPPORT, ISC_R_ADDRNOTAVAIL);
ERROR_MATCH(ECONNREFUSED, ISC_R_CONNREFUSED);
ERROR_MATCH(EHOSTUNREACH, ISC_R_HOSTUNREACH);
#ifdef EHOSTDOWN
ERROR_MATCH(EHOSTDOWN, ISC_R_HOSTUNREACH);
#endif
ERROR_MATCH(ENETUNREACH, ISC_R_NETUNREACH);
ERROR_MATCH(ENOBUFS, ISC_R_NORESOURCES);
ERROR_MATCH(EPERM, ISC_R_HOSTUNREACH);
ERROR_MATCH(EPIPE, ISC_R_NOTCONNECTED);
ERROR_MATCH(ETIMEDOUT, ISC_R_TIMEDOUT);
ERROR_MATCH(ECONNRESET, ISC_R_CONNECTIONRESET);
#undef ERROR_MATCH
default:
dev->result = ISC_R_UNEXPECTED;
isc_sockaddr_format(&sock->address, peerbuf,
sizeof(peerbuf));
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_connect: connect(%s) %s",
peerbuf, strbuf);
}
} else {
dev->result = ISC_R_SUCCESS;
sock->connected = 1;
sock->bound = 1;
}
sock->connect_ev = NULL;
UNLOCK(&sock->lock);
task = dev->ev_sender;
dev->ev_sender = sock;
isc_task_sendanddetach(&task, ISC_EVENT_PTR(&dev));
}
isc_result_t
isc_socket_getpeername(isc_socket_t *sock, isc_sockaddr_t *addressp) {
isc_result_t result;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(addressp != NULL);
LOCK(&sock->lock);
if (sock->connected) {
*addressp = sock->address;
result = ISC_R_SUCCESS;
} else {
result = ISC_R_NOTCONNECTED;
}
UNLOCK(&sock->lock);
return (result);
}
isc_result_t
isc_socket_getsockname(isc_socket_t *sock, isc_sockaddr_t *addressp) {
ISC_SOCKADDR_LEN_T len;
isc_result_t result;
char strbuf[ISC_STRERRORSIZE];
REQUIRE(VALID_SOCKET(sock));
REQUIRE(addressp != NULL);
LOCK(&sock->lock);
if (!sock->bound) {
result = ISC_R_NOTBOUND;
goto out;
}
result = ISC_R_SUCCESS;
len = sizeof(addressp->type);
if (getsockname(sock->fd, &addressp->type.sa, (void *)&len) < 0) {
isc__strerror(errno, strbuf, sizeof(strbuf));
UNEXPECTED_ERROR(__FILE__, __LINE__, "getsockname: %s",
strbuf);
result = ISC_R_UNEXPECTED;
goto out;
}
addressp->length = (unsigned int)len;
out:
UNLOCK(&sock->lock);
return (result);
}
/*
* Run through the list of events on this socket, and cancel the ones
* queued for task "task" of type "how". "how" is a bitmask.
*/
void
isc_socket_cancel(isc_socket_t *sock, isc_task_t *task, unsigned int how) {
REQUIRE(VALID_SOCKET(sock));
/*
* Quick exit if there is nothing to do. Don't even bother locking
* in this case.
*/
if (how == 0)
return;
LOCK(&sock->lock);
/*
* All of these do the same thing, more or less.
* Each will:
* o If the internal event is marked as "posted" try to
* remove it from the task's queue. If this fails, mark it
* as canceled instead, and let the task clean it up later.
* o For each I/O request for that task of that type, post
* its done event with status of "ISC_R_CANCELED".
* o Reset any state needed.
*/
if (((how & ISC_SOCKCANCEL_RECV) == ISC_SOCKCANCEL_RECV)
&& !ISC_LIST_EMPTY(sock->recv_list)) {
isc_socketevent_t *dev;
isc_socketevent_t *next;
isc_task_t *current_task;
dev = ISC_LIST_HEAD(sock->recv_list);
while (dev != NULL) {
current_task = dev->ev_sender;
next = ISC_LIST_NEXT(dev, ev_link);
if ((task == NULL) || (task == current_task)) {
dev->result = ISC_R_CANCELED;
send_recvdone_event(sock, &dev);
}
dev = next;
}
}
if (((how & ISC_SOCKCANCEL_SEND) == ISC_SOCKCANCEL_SEND)
&& !ISC_LIST_EMPTY(sock->send_list)) {
isc_socketevent_t *dev;
isc_socketevent_t *next;
isc_task_t *current_task;
dev = ISC_LIST_HEAD(sock->send_list);
while (dev != NULL) {
current_task = dev->ev_sender;
next = ISC_LIST_NEXT(dev, ev_link);
if ((task == NULL) || (task == current_task)) {
dev->result = ISC_R_CANCELED;
send_senddone_event(sock, &dev);
}
dev = next;
}
}
if (((how & ISC_SOCKCANCEL_ACCEPT) == ISC_SOCKCANCEL_ACCEPT)
&& !ISC_LIST_EMPTY(sock->accept_list)) {
isc_socket_newconnev_t *dev;
isc_socket_newconnev_t *next;
isc_task_t *current_task;
dev = ISC_LIST_HEAD(sock->accept_list);
while (dev != NULL) {
current_task = dev->ev_sender;
next = ISC_LIST_NEXT(dev, ev_link);
if ((task == NULL) || (task == current_task)) {
ISC_LIST_UNLINK(sock->accept_list, dev,
ev_link);
dev->newsocket->references--;
free_socket(&dev->newsocket);
dev->result = ISC_R_CANCELED;
dev->ev_sender = sock;
isc_task_sendanddetach(&current_task,
ISC_EVENT_PTR(&dev));
}
dev = next;
}
}
/*
* Connecting is not a list.
*/
if (((how & ISC_SOCKCANCEL_CONNECT) == ISC_SOCKCANCEL_CONNECT)
&& sock->connect_ev != NULL) {
isc_socket_connev_t *dev;
isc_task_t *current_task;
INSIST(sock->connecting);
sock->connecting = 0;
dev = sock->connect_ev;
current_task = dev->ev_sender;
if ((task == NULL) || (task == current_task)) {
sock->connect_ev = NULL;
dev->result = ISC_R_CANCELED;
dev->ev_sender = sock;
isc_task_sendanddetach(&current_task,
ISC_EVENT_PTR(&dev));
}
}
UNLOCK(&sock->lock);
}
isc_sockettype_t
isc_socket_gettype(isc_socket_t *sock) {
REQUIRE(VALID_SOCKET(sock));
return (sock->type);
}
isc_boolean_t
isc_socket_isbound(isc_socket_t *sock) {
isc_boolean_t val;
LOCK(&sock->lock);
val = ((sock->bound) ? ISC_TRUE : ISC_FALSE);
UNLOCK(&sock->lock);
return (val);
}
void
isc_socket_ipv6only(isc_socket_t *sock, isc_boolean_t yes) {
#if defined(IPV6_V6ONLY)
int onoff = yes ? 1 : 0;
#else
UNUSED(yes);
UNUSED(sock);
#endif
REQUIRE(VALID_SOCKET(sock));
#ifdef IPV6_V6ONLY
if (sock->pf == AF_INET6) {
(void)setsockopt(sock->fd, IPPROTO_IPV6, IPV6_V6ONLY,
(void *)&onoff, sizeof(onoff));
}
#endif
}
#ifndef ISC_PLATFORM_USETHREADS
void
isc__socketmgr_getfdsets(fd_set **readset, fd_set **writeset, int *maxfd) {
if (socketmgr == NULL)
*maxfd = 0;
else {
/* Prepare duplicates of fd_sets, as select() will modify */
memcpy(socketmgr->read_fds_copy, socketmgr->read_fds,
socketmgr->fd_bufsize);
memcpy(socketmgr->write_fds_copy, socketmgr->write_fds,
socketmgr->fd_bufsize);
*readset = socketmgr->read_fds_copy;
*writeset = socketmgr->write_fds_copy;
*maxfd = socketmgr->maxfd + 1;
}
}
isc_result_t
isc__socketmgr_dispatch(fd_set *readset, fd_set *writeset, int maxfd) {
isc_socketmgr_t *manager = socketmgr;
if (manager == NULL)
return (ISC_R_NOTFOUND);
process_fds(manager, maxfd, readset, writeset);
return (ISC_R_SUCCESS);
}
#endif /* ISC_PLATFORM_USETHREADS */
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