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bind/lib/isc/unix/socket.c

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/*
* Copyright (C) 1998, 1999, 2000 Internet Software Consortium.
*
* Permission to use, copy, modify, and 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 INTERNET SOFTWARE CONSORTIUM DISCLAIMS
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
* CONSORTIUM 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.
*/
#include <config.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <errno.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <isc/assertions.h>
#include <isc/buffer.h>
#include <isc/condition.h>
#include <isc/error.h>
#include <isc/list.h>
#include <isc/mutex.h>
#include <isc/net.h>
#include <isc/region.h>
#include <isc/socket.h>
#include <isc/thread.h>
#include <isc/util.h>
/*
* 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
/*
* 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)
#if 0
#define ISC_SOCKET_DEBUG
#endif
#if defined(ISC_SOCKET_DEBUG)
#define TRACE_WATCHER 0x0001
#define TRACE_LISTEN 0x0002
#define TRACE_CONNECT 0x0004
#define TRACE_RECV 0x0008
#define TRACE_SEND 0x0010
#define TRACE_MANAGER 0x0020
int trace_level = TRACE_RECV;
#define XTRACE(l, a) do { \
if ((l) & trace_level) { \
printf("[%s:%d] ", __FILE__, __LINE__); \
printf a; \
fflush(stdout); \
} \
} while (0)
#define XENTER(l, a) do { \
if ((l) & trace_level) \
fprintf(stderr, "ENTER %s\n", (a)); \
} while (0)
#define XEXIT(l, a) do { \
if ((l) & trace_level) \
fprintf(stderr, "EXIT %s\n", (a)); \
} while (0)
#else
#define XTRACE(l, a)
#define XENTER(l, a)
#define XEXIT(l, a)
#endif
typedef isc_event_t intev_t;
#define SOCKET_MAGIC 0x494f696fU /* IOio */
#define VALID_SOCKET(t) ((t) != NULL && (t)->magic == 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_HAVEIPV6
#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
/*
* Check to see if we have even basic support for cracking messages from
* the control data returned from/sent via recvmsg()/sendmsg().
*/
#if defined(USE_CMSG) && (!defined(CMSG_LEN) || !defined(CMSG_SPACE))
#undef USE_CMSG
#endif
struct isc_socket {
/* Not locked. */
unsigned int magic;
isc_socketmgr_t *manager;
isc_mutex_t lock;
isc_sockettype_t type;
/* Locked by socket lock. */
unsigned int references;
int fd;
isc_result_t recv_result;
isc_result_t send_result;
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 */
#ifdef ISC_NET_RECVOVERFLOW
unsigned char overflow; /* used for MSG_TRUNC fake */
#endif
#ifdef USE_CMSG
unsigned char *cmsg;
unsigned int cmsglen;
#endif
};
#define SOCKET_MANAGER_MAGIC 0x494f6d67U /* IOmg */
#define VALID_MANAGER(m) ((m) != NULL && \
(m)->magic == SOCKET_MANAGER_MAGIC)
struct isc_socketmgr {
/* Not locked. */
unsigned int magic;
isc_mem_t *mctx;
isc_mutex_t lock;
/* Locked by manager lock. */
unsigned int nsockets; /* sockets managed */
isc_thread_t watcher;
isc_condition_t shutdown_ok;
fd_set read_fds;
fd_set write_fds;
isc_socket_t *fds[FD_SETSIZE];
int fdstate[FD_SETSIZE];
int maxfd;
int pipe_fds[2];
};
#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 **,
isc_result_t);
static void send_senddone_event(isc_socket_t *, isc_socketevent_t **,
isc_result_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 *, unsigned int,
size_t *);
static void build_msghdr_recv(isc_socket_t *, isc_socketevent_t *,
struct msghdr *, struct iovec *, unsigned int,
size_t *);
#define SELECT_POKE_SHUTDOWN (-1)
#define SELECT_POKE_NOTHING (-2)
#define SOCK_DEAD(s) ((s)->references == 0)
/*
* Poke the select loop when there is something for us to do.
* We assume that if a write completes here, it will be inserted into the
* queue fully. That is, we will not get partial writes.
*/
static void
select_poke(isc_socketmgr_t *mgr, int msg)
{
int cc;
do {
cc = write(mgr->pipe_fds[1], &msg, sizeof(int));
} while (cc < 0 && SOFT_ERROR(errno));
if (cc < 0)
FATAL_ERROR(__FILE__, __LINE__,
"write() failed during watcher poke: %s",
strerror(errno));
INSIST(cc == sizeof(int));
}
/*
* read a message on the internal fd.
*/
static int
select_readmsg(isc_socketmgr_t *mgr)
{
int msg;
int cc;
cc = read(mgr->pipe_fds[0], &msg, sizeof(int));
if (cc < 0) {
if (SOFT_ERROR(errno))
return (SELECT_POKE_NOTHING);
FATAL_ERROR(__FILE__, __LINE__,
"read() failed during watcher poke: %s",
strerror(errno));
return (SELECT_POKE_NOTHING);
}
return (msg);
}
/*
* Make a fd non-blocking
*/
static isc_result_t
make_nonblock(int fd)
{
int ret;
int flags;
flags = fcntl(fd, F_GETFL, 0);
flags |= O_NONBLOCK;
ret = fcntl(fd, F_SETFL, flags);
if (ret == -1) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"fcntl(%d, F_SETFL, %d): %s",
fd, flags, strerror(errno));
return (ISC_R_UNEXPECTED);
}
return (ISC_R_SUCCESS);
}
/*
* 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_HAVEIPV6
struct in6_pktinfo *pktinfop;
#endif
#ifdef SO_TIMESTAMP
struct timeval *timevalp;
#endif
#endif
UNUSED(sock);
#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 == 0 || msg->msg_control == NULL)
return;
#ifdef SO_TIMESTAMP
timevalp = NULL;
#endif
#ifdef ISC_PLATFORM_HAVEIPV6
pktinfop = NULL;
#endif
cmsgp = CMSG_FIRSTHDR(msg);
while (cmsgp != NULL) {
XTRACE(TRACE_RECV, ("Processing cmsg %p\n", cmsgp));
#ifdef ISC_PLATFORM_HAVEIPV6
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;
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. Return
* 0 on success, non-zero on failure. This is the SEND constructor, which
* will used 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, unsigned int maxiov,
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_USEDCOUNT(buffer))
break;
skip_count -= ISC_BUFFER_USEDCOUNT(buffer);
buffer = ISC_LIST_NEXT(buffer, link);
}
while (buffer != NULL) {
INSIST(iovcount < maxiov);
isc_buffer_used(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 == 0);
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)
if ((sock->type == isc_sockettype_udp)
&& ((dev->attributes & ISC_SOCKEVENTATTR_PKTINFO) != 0)) {
struct cmsghdr *cmsgp;
struct in6_pktinfo *pktinfop;
msg->msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
msg->msg_control = (void *)sock->cmsg;
cmsgp = (struct cmsghdr *)sock->cmsg;
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 */
#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. Return
* 0 on success, non-zero on failure. 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, unsigned int maxiov,
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));
msg->msg_name = (void *)&dev->address.type.sa;
msg->msg_namelen = sizeof(dev->address.type);
#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_AVAILABLECOUNT(buffer) != 0)
break;
buffer = ISC_LIST_NEXT(buffer, link);
}
iovcount = 0;
while (buffer != NULL) {
INSIST(iovcount < maxiov);
isc_buffer_available(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 = (void *)sock->cmsg;
msg->msg_controllen = sock->cmsglen;
}
#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 isc_socketevent_t *
allocate_socketevent(isc_socket_t *sock, isc_eventtype_t eventtype,
isc_taskaction_t action, 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;
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 */
#define DOIO_UNEXPECTED (-1) /* bad stuff, 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;
build_msghdr_recv(sock, dev, &msghdr, iov,
MAXSCATTERGATHER_RECV, &read_count);
#if defined(ISC_SOCKET_DEBUG)
dump_msg(&msghdr);
#endif
cc = recvmsg(sock->fd, &msghdr, 0);
if (cc < 0) {
if (SOFT_ERROR(errno))
return (DOIO_SOFT);
XTRACE(TRACE_RECV,
("doio_recv: recvmsg(%d) %d bytes, err %d/%s\n",
sock->fd, cc, errno, strerror(errno)));
#define SOFT_OR_HARD(_system, _isc) \
if (errno == _system) { \
if (sock->connected) { \
if (sock->type == isc_sockettype_tcp) \
sock->recv_result = _isc; \
send_recvdone_event(sock, &dev, _isc); \
return (DOIO_HARD); \
} \
return (DOIO_SOFT); \
}
#define ALWAYS_HARD(_system, _isc) \
if (errno == _system) { \
sock->recv_result = _isc; \
send_recvdone_event(sock, &dev, _isc); \
return (DOIO_HARD); \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
ALWAYS_HARD(ENETUNREACH, ISC_R_NETUNREACH);
ALWAYS_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
ALWAYS_HARD(ENOBUFS, ISC_R_NORESOURCES);
#undef SOFT_OR_HARD
#undef ALWAYS_HARD
sock->recv_result = ISC_R_UNEXPECTED;
send_recvdone_event(sock, &dev, ISC_R_UNEXPECTED);
return (DOIO_SUCCESS);
}
/*
* 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)) {
sock->recv_result = ISC_R_EOF;
return (DOIO_EOF);
}
if (sock->type == isc_sockettype_udp)
dev->address.length = msghdr.msg_namelen;
/*
* 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 > 0) {
REQUIRE(ISC_BUFFER_VALID(buffer));
if (ISC_BUFFER_AVAILABLECOUNT(buffer) <= actual_count) {
actual_count -= ISC_BUFFER_AVAILABLECOUNT(buffer);
isc_buffer_add(buffer,
ISC_BUFFER_AVAILABLECOUNT(buffer));
} else {
isc_buffer_add(buffer, actual_count);
actual_count = 0;
break;
}
buffer = ISC_LIST_NEXT(buffer, link);
if (buffer == NULL) {
INSIST(actual_count == 0);
}
}
/*
* 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.
*/
send_recvdone_event(sock, &dev, ISC_R_SUCCESS);
return (DOIO_SUCCESS);
}
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;
/* XXXMLG Should verify that we didn't overflow MAXSCATTERGATHER? */
build_msghdr_send(sock, dev, &msghdr, iov,
MAXSCATTERGATHER_SEND, &write_count);
cc = sendmsg(sock->fd, &msghdr, 0);
/*
* check for error or block condition
*/
if (cc < 0) {
if (SOFT_ERROR(errno))
return (DOIO_SOFT);
#define SOFT_OR_HARD(_system, _isc) \
if (errno == _system) { \
if (sock->connected) { \
if (sock->type == isc_sockettype_tcp) \
sock->send_result = _isc; \
send_senddone_event(sock, &dev, _isc); \
return (DOIO_HARD); \
} \
return (DOIO_SOFT); \
}
#define ALWAYS_HARD(_system, _isc) \
if (errno == _system) { \
sock->send_result = _isc; \
send_senddone_event(sock, &dev, _isc); \
return (DOIO_HARD); \
}
SOFT_OR_HARD(ECONNREFUSED, ISC_R_CONNREFUSED);
ALWAYS_HARD(ENETUNREACH, ISC_R_NETUNREACH);
ALWAYS_HARD(EHOSTUNREACH, ISC_R_HOSTUNREACH);
ALWAYS_HARD(ENOBUFS, ISC_R_NORESOURCES);
#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.
*/
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_send: %s",
strerror(errno));
sock->send_result = ISC_R_UNEXPECTED;
send_senddone_event(sock, &dev, ISC_R_UNEXPECTED);
return (DOIO_HARD);
}
if (cc == 0)
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_send: send() returned 0");
/*
* 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.
*/
send_senddone_event(sock, &dev, 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;
XTRACE(TRACE_MANAGER,
("destroy sockp = %p, sock = %p\n", sockp, sock));
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);
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(sock->manager, sock->fd);
manager->nsockets--;
XTRACE(TRACE_MANAGER, ("nsockets == %d\n", manager->nsockets));
if (manager->nsockets == 0)
SIGNAL(&manager->shutdown_ok);
/*
* 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 ret;
sock = isc_mem_get(manager->mctx, sizeof *sock);
if (sock == NULL)
return (ISC_R_NOMEMORY);
#if USE_CMSG /* Let's hope the OSs are sane, and pad correctly XXXMLG */
sock->cmsglen = 0;
#ifdef ISC_PLATFORM_HAVEIPV6
sock->cmsglen += CMSG_SPACE(sizeof(struct in6_pktinfo));
#endif
#ifdef SO_TIMESTAMP
sock->cmsglen += CMSG_SPACE(sizeof(struct timeval));
#endif
sock->cmsg = isc_mem_get(manager->mctx, sock->cmsglen);
if (sock->cmsg == NULL) {
ret = ISC_R_NOMEMORY;
goto err1;
}
#endif
ret = ISC_R_UNEXPECTED;
sock->magic = 0;
sock->references = 0;
sock->manager = manager;
sock->type = type;
sock->fd = -1;
/*
* 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->recv_result = ISC_R_SUCCESS;
sock->send_result = ISC_R_SUCCESS;
/*
* initialize the lock
*/
if (isc_mutex_init(&sock->lock) != ISC_R_SUCCESS) {
sock->magic = 0;
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed");
ret = ISC_R_UNEXPECTED;
goto err2;
}
/*
* 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);
err2: /* cmsg allocated */
#ifdef USE_CMSG
isc_mem_put(manager->mctx, sock->cmsg, sock->cmsglen);
sock->cmsglen = 0;
sock->cmsg = NULL;
#endif
err1: /* socket allocated */
isc_mem_put(manager->mctx, sock, sizeof *sock);
return (ret);
}
/*
* 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(EMPTY(sock->recv_list));
INSIST(EMPTY(sock->send_list));
INSIST(EMPTY(sock->accept_list));
sock->magic = 0;
(void)isc_mutex_destroy(&sock->lock);
#ifdef USE_CMSG
isc_mem_put(sock->manager->mctx, sock->cmsg, sock->cmsglen);
#endif
isc_mem_put(sock->manager->mctx, sock, sizeof *sock);
*socketp = NULL;
}
/*
* Create a new 'type' socket managed by 'manager'. The sockets
* parameters are specified by 'expires' and 'interval'. 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 ret;
#if defined(USE_CMSG)
int on = 1;
#endif
REQUIRE(VALID_MANAGER(manager));
REQUIRE(socketp != NULL && *socketp == NULL);
XENTER(TRACE_MANAGER, "isc_socket_create");
ret = allocate_socket(manager, type, &sock);
if (ret != ISC_R_SUCCESS)
return (ret);
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;
}
if (sock->fd < 0) {
free_socket(&sock);
switch (errno) {
case EMFILE:
case ENFILE:
case ENOBUFS:
return (ISC_R_NORESOURCES);
default:
UNEXPECTED_ERROR(__FILE__, __LINE__,
"socket() failed: %s",
strerror(errno));
return (ISC_R_UNEXPECTED);
}
}
if (make_nonblock(sock->fd) != ISC_R_SUCCESS) {
free_socket(&sock);
return (ISC_R_UNEXPECTED);
}
#if defined(USE_CMSG)
if (type == isc_sockettype_udp) {
#if defined(SO_TIMESTAMP)
if (setsockopt(sock->fd, SOL_SOCKET, SO_TIMESTAMP,
(void *)&on, sizeof on) < 0) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d) failed", sock->fd);
/* Press on... */
}
#endif /* SO_TIMESTAMP */
#if defined(ISC_PLATFORM_HAVEIPV6)
if ((pf == AF_INET6)
&& (setsockopt(sock->fd, IPPROTO_IPV6, IPV6_PKTINFO,
(void *)&on, sizeof (on)) < 0)) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"setsockopt(%d) failed: %s",
sock->fd, strerror(errno));
}
#endif /* ISC_PLATFORM_HAVEIPV6 */
}
#endif /* USE_CMSG */
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;
manager->nsockets++;
XTRACE(TRACE_MANAGER, ("nsockets == %d\n", manager->nsockets));
if (manager->maxfd < sock->fd)
manager->maxfd = sock->fd;
UNLOCK(&manager->lock);
XEXIT(TRACE_MANAGER, "isc_socket_create");
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));
XENTER(TRACE_MANAGER, "isc_socket_detach");
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);
XEXIT(TRACE_MANAGER, "isc_socket_detach");
*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_read(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;
XTRACE(TRACE_WATCHER, ("dispatch_read: posted event %p to task %p\n",
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_write(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;
XTRACE(TRACE_WATCHER, ("dispatch_send: posted event %p to task %p\n",
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.
*/
static void
send_recvdone_event(isc_socket_t *sock, isc_socketevent_t **dev,
isc_result_t resultcode)
{
isc_task_t *task;
task = (*dev)->ev_sender;
(*dev)->result = resultcode;
(*dev)->ev_sender = sock;
if (ISC_LINK_LINKED(*dev, ev_link))
ISC_LIST_DEQUEUE(sock->recv_list, *dev, ev_link);
if (sock->recv_result != ISC_R_SUCCESS)
(*dev)->attributes |= ISC_SOCKEVENTATTR_FATALERROR;
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.
*/
static void
send_senddone_event(isc_socket_t *sock, isc_socketevent_t **dev,
isc_result_t resultcode)
{
isc_task_t *task;
INSIST(dev != NULL && *dev != NULL);
task = (*dev)->ev_sender;
(*dev)->result = resultcode;
(*dev)->ev_sender = sock;
if (ISC_LINK_LINKED(*dev, ev_link))
ISC_LIST_DEQUEUE(sock->send_list, *dev, ev_link);
if (sock->send_result != ISC_R_SUCCESS)
(*dev)->attributes |= ISC_SOCKEVENTATTR_FATALERROR;
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;
UNUSED(me);
sock = ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
XTRACE(TRACE_LISTEN,
("internal_accept called, locked parent sock %p\n", sock));
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.
*/
addrlen = sizeof dev->newsocket->address.type;
fd = accept(sock->fd, &dev->newsocket->address.type.sa, (void *)&addrlen);
dev->newsocket->address.length = addrlen;
if (fd < 0) {
if (SOFT_ERROR(errno)) {
select_poke(sock->manager, sock->fd);
UNLOCK(&sock->lock);
return;
}
/*
* If some other error, ignore it as well and hope
* for the best, but log it.
*/
XTRACE(TRACE_LISTEN, ("internal_accept: accept returned %s\n",
strerror(errno)));
fd = -1;
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_accept: accept() failed: %s",
strerror(errno));
result = ISC_R_UNEXPECTED;
}
/*
* Pull off the done event.
*/
ISC_LIST_UNLINK(sock->accept_list, dev, ev_link);
/*
* Poke watcher if there are more pending accepts.
*/
if (!EMPTY(sock->accept_list))
select_poke(sock->manager, sock->fd);
UNLOCK(&sock->lock);
if (fd != -1 && (make_nonblock(fd) != ISC_R_SUCCESS)) {
close(fd);
fd = -1;
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_accept: make_nonblock() failed: %s",
strerror(errno));
result = ISC_R_UNEXPECTED;
}
/*
* -1 means the new socket didn't happen.
*/
if (fd != -1) {
dev->newsocket->fd = fd;
/*
* Save away the remote address
*/
dev->address = dev->newsocket->address;
LOCK(&manager->lock);
manager->fds[fd] = dev->newsocket;
manager->fdstate[fd] = MANAGED;
if (manager->maxfd < fd)
manager->maxfd = fd;
manager->nsockets++;
XTRACE(TRACE_MANAGER, ("nsockets == %d\n", manager->nsockets));
UNLOCK(&manager->lock);
XTRACE(TRACE_LISTEN, ("internal_accept: newsock %p, fd %d\n",
dev->newsocket, fd));
}
/*
* 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_t **)&dev);
}
static void
internal_recv(isc_task_t *me, isc_event_t *ev)
{
isc_socketevent_t *dev;
isc_socket_t *sock;
isc_task_t *task;
UNUSED(me);
INSIST(ev->ev_type == ISC_SOCKEVENT_INTR);
sock = ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
XTRACE(TRACE_SEND,
("internal_recv: task %p got event %p, sock %p, fd %d\n",
me, ev, sock, sock->fd));
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. If some sort of quantum read count is
* desired before giving up control, make certain to process markers
* regardless of quantum.
*/
dev = ISC_LIST_HEAD(sock->recv_list);
while (dev != NULL) {
task = dev->ev_sender;
/*
* If this is a marker event, post its completion and
* continue the loop.
*/
if (dev->ev_type == ISC_SOCKEVENT_RECVMARK) {
send_recvdone_event(sock, &dev, sock->recv_result);
goto next;
}
if (sock->recv_result != ISC_R_SUCCESS) {
XTRACE(TRACE_RECV, ("STICKY RESULT: %d\n",
sock->recv_result));
send_recvdone_event(sock, &dev, sock->recv_result);
goto next;
}
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. This will
* set the EOF flag in markers as well, but
* that's really ok.
*/
do {
send_recvdone_event(sock, &dev, ISC_R_EOF);
dev = ISC_LIST_HEAD(sock->recv_list);
} while (dev != NULL);
goto poke;
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
case DOIO_HARD:
break;
}
next:
dev = ISC_LIST_HEAD(sock->recv_list);
}
poke:
if (!EMPTY(sock->recv_list))
select_poke(sock->manager, sock->fd);
UNLOCK(&sock->lock);
}
static void
internal_send(isc_task_t *me, isc_event_t *ev)
{
isc_socketevent_t *dev;
isc_socket_t *sock;
isc_task_t *task;
UNUSED(me);
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);
XTRACE(TRACE_SEND,
("internal_send: task %p got event %p, sock %p, fd %d\n",
me, ev, sock, sock->fd));
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. If some sort of quantum write count is
* desired before giving up control, make certain to process markers
* regardless of quantum.
*/
dev = ISC_LIST_HEAD(sock->send_list);
while (dev != NULL) {
task = dev->ev_sender;
/*
* If this is a marker event, post its completion and
* continue the loop.
*/
if (dev->ev_type == ISC_SOCKEVENT_SENDMARK) {
send_senddone_event(sock, &dev, sock->send_result);
goto next;
}
if (sock->send_result != ISC_R_SUCCESS) {
send_senddone_event(sock, &dev, sock->send_result);
goto next;
}
switch (doio_send(sock, dev)) {
case DOIO_SOFT:
goto poke;
case DOIO_HARD:
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
break;
}
next:
dev = ISC_LIST_HEAD(sock->send_list);
}
poke:
if (!EMPTY(sock->send_list))
select_poke(sock->manager, sock->fd);
UNLOCK(&sock->lock);
}
/*
* 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_socket_t *sock;
isc_boolean_t done;
int ctlfd;
int cc;
fd_set readfds;
fd_set writefds;
int msg;
isc_boolean_t unlock_sock;
int i;
isc_socketevent_t *rev;
isc_event_t *ev2;
int maxfd;
/*
* Get the control fd here. This will never change.
*/
LOCK(&manager->lock);
ctlfd = manager->pipe_fds[0];
done = ISC_FALSE;
while (!done) {
do {
readfds = manager->read_fds;
writefds = manager->write_fds;
maxfd = manager->maxfd + 1;
#ifdef ISC_SOCKET_DEBUG
XTRACE(TRACE_WATCHER, ("select maxfd %d\n", maxfd));
for (i = 0 ; i < FD_SETSIZE ; i++) {
int printit;
printit = 0;
if (FD_ISSET(i, &readfds)) {
XTRACE(TRACE_WATCHER,
("select r on %d\n", i));
printit = 1;
}
if (FD_ISSET(i, &writefds)) {
XTRACE(TRACE_WATCHER,
("select w on %d\n", i));
printit = 1;
}
}
#endif
UNLOCK(&manager->lock);
cc = select(maxfd, &readfds, &writefds, NULL, NULL);
XTRACE(TRACE_WATCHER,
("select(%d, ...) == %d, errno %d\n",
maxfd, cc, errno));
if (cc < 0) {
if (!SOFT_ERROR(errno))
FATAL_ERROR(__FILE__, __LINE__,
"select failed: %s",
strerror(errno));
}
LOCK(&manager->lock);
} while (cc < 0);
/*
* Process reads on internal, control fd.
*/
if (FD_ISSET(ctlfd, &readfds)) {
for (;;) {
msg = select_readmsg(manager);
XTRACE(TRACE_WATCHER,
("watcher got message %d\n", 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) {
XTRACE(TRACE_WATCHER,
("watcher got SHUTDOWN\n"));
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.
*/
if (msg >= 0) {
INSIST(msg < FD_SETSIZE);
if (manager->fdstate[msg] ==
CLOSE_PENDING) {
manager->fdstate[msg] = CLOSED;
FD_CLR(msg,
&manager->read_fds);
FD_CLR(msg,
&manager->write_fds);
close(msg);
XTRACE(TRACE_WATCHER,
("Watcher closed %d\n",
msg));
continue;
}
if (manager->fdstate[msg] != MANAGED)
continue;
sock = manager->fds[msg];
LOCK(&sock->lock);
XTRACE(TRACE_WATCHER,
("watcher locked socket %p\n",
sock));
/*
* If there are no events, or there
* is an event but we have already
* queued up the internal event on a
* task's queue, clear the bit.
* Otherwise, set it.
*/
rev = ISC_LIST_HEAD(sock->recv_list);
ev2 = (isc_event_t *)ISC_LIST_HEAD(sock->accept_list);
if ((rev == NULL && ev2 == NULL)
|| sock->pending_recv
|| sock->pending_accept) {
FD_CLR(sock->fd,
&manager->read_fds);
XTRACE(TRACE_WATCHER,
("watch cleared r\n"));
} else {
FD_SET(sock->fd,
&manager->read_fds);
XTRACE(TRACE_WATCHER,
("watch set r\n"));
}
rev = ISC_LIST_HEAD(sock->send_list);
if ((rev == NULL
|| sock->pending_send)
&& !sock->connecting) {
FD_CLR(sock->fd,
&manager->write_fds);
XTRACE(TRACE_WATCHER,
("watch cleared w\n"));
} else {
FD_SET(sock->fd,
&manager->write_fds);
XTRACE(TRACE_WATCHER,
("watch set w\n"));
}
UNLOCK(&sock->lock);
}
}
}
/*
* 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++) {
if (i == manager->pipe_fds[0]
|| i == manager->pipe_fds[1])
continue;
if (manager->fdstate[i] == CLOSE_PENDING) {
manager->fdstate[i] = CLOSED;
FD_CLR(i, &manager->read_fds);
FD_CLR(i, &manager->write_fds);
close(i);
XTRACE(TRACE_WATCHER,
("Watcher closed %d\n", 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;
}
XTRACE(TRACE_WATCHER,
("watcher r on %d, sock %p\n",
i, manager->fds[i]));
unlock_sock = ISC_TRUE;
LOCK(&sock->lock);
if (!SOCK_DEAD(sock)) {
if (sock->listener)
dispatch_accept(sock);
else
dispatch_read(sock);
}
FD_CLR(i, &manager->read_fds);
}
check_write:
if (FD_ISSET(i, &writefds)) {
if (sock == NULL) {
FD_CLR(i, &manager->write_fds);
continue;
}
XTRACE(TRACE_WATCHER,
("watcher w on %d, sock %p\n",
i, manager->fds[i]));
if (!unlock_sock) {
unlock_sock = ISC_TRUE;
LOCK(&sock->lock);
}
if (!SOCK_DEAD(sock)) {
if (sock->connecting)
dispatch_connect(sock);
else
dispatch_write(sock);
}
FD_CLR(i, &manager->write_fds);
}
if (unlock_sock)
UNLOCK(&sock->lock);
}
}
XTRACE(TRACE_WATCHER, ("Watcher exiting\n"));
UNLOCK(&manager->lock);
return ((isc_threadresult_t)0);
}
/*
* Create a new socket manager.
*/
isc_result_t
isc_socketmgr_create(isc_mem_t *mctx, isc_socketmgr_t **managerp)
{
isc_socketmgr_t *manager;
REQUIRE(managerp != NULL && *managerp == NULL);
XENTER(TRACE_MANAGER, "isc_socketmgr_create");
manager = isc_mem_get(mctx, sizeof *manager);
if (manager == NULL)
return (ISC_R_NOMEMORY);
manager->magic = SOCKET_MANAGER_MAGIC;
manager->mctx = mctx;
memset(manager->fds, 0, sizeof(manager->fds));
manager->nsockets = 0;
if (isc_mutex_init(&manager->lock) != ISC_R_SUCCESS) {
isc_mem_put(mctx, manager, sizeof *manager);
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_mutex_init() failed");
return (ISC_R_UNEXPECTED);
}
if (isc_condition_init(&manager->shutdown_ok) != ISC_R_SUCCESS) {
(void)isc_mutex_destroy(&manager->lock);
isc_mem_put(mctx, manager, sizeof *manager);
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_condition_init() 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) {
(void)isc_mutex_destroy(&manager->lock);
isc_mem_put(mctx, manager, sizeof *manager);
UNEXPECTED_ERROR(__FILE__, __LINE__,
"pipe() failed: %s",
strerror(errno));
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
/*
* Set up initial state for the select loop
*/
FD_ZERO(&manager->read_fds);
FD_ZERO(&manager->write_fds);
FD_SET(manager->pipe_fds[0], &manager->read_fds);
manager->maxfd = manager->pipe_fds[0];
memset(manager->fdstate, 0, sizeof(manager->fdstate));
/*
* Start up the select/poll thread.
*/
if (isc_thread_create(watcher, manager, &manager->watcher) !=
ISC_R_SUCCESS) {
(void)isc_mutex_destroy(&manager->lock);
isc_mem_put(mctx, manager, sizeof *manager);
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_thread_create() failed");
close(manager->pipe_fds[0]);
close(manager->pipe_fds[1]);
return (ISC_R_UNEXPECTED);
}
*managerp = manager;
XEXIT(TRACE_MANAGER, "isc_socketmgr_create (normal)");
return (ISC_R_SUCCESS);
}
void
isc_socketmgr_destroy(isc_socketmgr_t **managerp)
{
isc_socketmgr_t *manager;
int i;
/*
* Destroy a socket manager.
*/
REQUIRE(managerp != NULL);
manager = *managerp;
REQUIRE(VALID_MANAGER(manager));
LOCK(&manager->lock);
XTRACE(TRACE_MANAGER, ("nsockets == %d\n", manager->nsockets));
/*
* Wait for all sockets to be destroyed.
*/
while (manager->nsockets != 0) {
XTRACE(TRACE_MANAGER, ("nsockets == %d\n", manager->nsockets));
WAIT(&manager->shutdown_ok, &manager->lock);
}
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.
*/
select_poke(manager, SELECT_POKE_SHUTDOWN);
/*
* Wait for thread to exit.
*/
if (isc_thread_join(manager->watcher, NULL) != ISC_R_SUCCESS)
UNEXPECTED_ERROR(__FILE__, __LINE__,
"isc_thread_join() failed");
/*
* Clean up.
*/
close(manager->pipe_fds[0]);
close(manager->pipe_fds[1]);
for (i = 0 ; i < FD_SETSIZE ; i++)
if (manager->fdstate[i] == CLOSE_PENDING)
close(i);
(void)isc_condition_destroy(&manager->shutdown_ok);
(void)isc_mutex_destroy(&manager->lock);
manager->magic = 0;
isc_mem_put(manager->mctx, manager, sizeof *manager);
*managerp = NULL;
}
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, void *arg)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
isc_boolean_t was_empty;
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);
LOCK(&sock->lock);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_RECVDONE, action, arg);
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
/***
*** From here down, only ISC_R_SUCCESS can be returned. Any further
*** error information will result in the done event being posted
*** to the task rather than this function failing.
***/
/*
* 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;
}
dev->ev_sender = task;
/*
* 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);
}
/*
* If the read queue is empty, try to do the I/O right now.
*/
was_empty = ISC_LIST_EMPTY(sock->recv_list);
if (!was_empty)
goto queue;
if (sock->recv_result != ISC_R_SUCCESS) {
send_recvdone_event(sock, &dev, sock->recv_result);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
switch (doio_recv(sock, dev)) {
case DOIO_SOFT:
goto queue;
case DOIO_EOF:
send_recvdone_event(sock, &dev, ISC_R_EOF);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
case DOIO_HARD:
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
queue:
/*
* 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;
/*
* Enqueue the request. If the socket was previously not being
* watched, poke the watcher to start paying attention to it.
*/
ISC_LIST_ENQUEUE(sock->recv_list, dev, ev_link);
if (was_empty)
select_poke(sock->manager, sock->fd);
XTRACE(TRACE_RECV,
("isc_socket_recvv: queued event %p, task %p\n", dev, ntask));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
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, void *arg)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
isc_boolean_t was_empty;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(region != NULL);
REQUIRE(region->length >= minimum);
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
LOCK(&sock->lock);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_RECVDONE, action, arg);
if (dev == NULL) {
UNLOCK(&sock->lock);
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 = region->length;
else
dev->minimum = minimum;
}
dev->result = ISC_R_SUCCESS;
dev->n = 0;
dev->region = *region;
dev->ev_sender = task;
was_empty = ISC_LIST_EMPTY(sock->recv_list);
/*
* If the read queue is empty, try to do the I/O right now.
*/
if (!was_empty)
goto queue;
if (sock->recv_result != ISC_R_SUCCESS) {
send_recvdone_event(sock, &dev, sock->recv_result);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
switch (doio_recv(sock, dev)) {
case DOIO_SOFT:
goto queue;
case DOIO_EOF:
send_recvdone_event(sock, &dev, ISC_R_EOF);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
case DOIO_HARD:
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
queue:
/*
* 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;
/*
* Enqueue the request. If the socket was previously not being
* watched, poke the watcher to start paying attention to it.
*/
ISC_LIST_ENQUEUE(sock->recv_list, dev, ev_link);
if (was_empty)
select_poke(sock->manager, sock->fd);
XTRACE(TRACE_RECV,
("isc_socket_recv: queued event %p, task %p\n", dev, ntask));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_send(isc_socket_t *sock, isc_region_t *region,
isc_task_t *task, isc_taskaction_t action, void *arg)
{
/*
* REQUIRE() checking 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, void *arg,
isc_sockaddr_t *address, struct in6_pktinfo *pktinfo)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
isc_boolean_t was_empty;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(region != NULL);
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
LOCK(&sock->lock);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_SENDDONE, action, arg);
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
dev->region = *region;
dev->ev_sender = task;
set_dev_address(address, sock, dev);
if (pktinfo != NULL) {
dev->attributes |= ISC_SOCKEVENTATTR_PKTINFO;
dev->pktinfo = *pktinfo;
}
/*
* If the write queue is empty, try to do the I/O right now.
*/
was_empty = ISC_LIST_EMPTY(sock->send_list);
if (!was_empty)
goto queue;
if (sock->send_result != ISC_R_SUCCESS) {
send_senddone_event(sock, &dev, sock->send_result);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
switch (doio_send(sock, dev)) {
case DOIO_SOFT:
goto queue;
case DOIO_HARD:
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
queue:
/*
* We couldn't send all or part of the request right now, so queue
* it.
*/
isc_task_attach(task, &ntask);
dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
/*
* Enqueue the request. If the socket was previously not being
* watched, poke the watcher to start paying attention to it.
*/
ISC_LIST_ENQUEUE(sock->send_list, dev, ev_link);
if (was_empty)
select_poke(sock->manager, sock->fd);
XTRACE(TRACE_SEND,
("isc_socket_send: queued event %p, task %p\n", dev, ntask));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_sendv(isc_socket_t *sock, isc_bufferlist_t *buflist,
isc_task_t *task, isc_taskaction_t action, 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, void *arg,
isc_sockaddr_t *address, struct in6_pktinfo *pktinfo)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
isc_boolean_t was_empty;
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);
LOCK(&sock->lock);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_SENDDONE, action, arg);
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
/***
*** From here down, only ISC_R_SUCCESS can be returned. Any further
*** error information will result in the done event being posted
*** to the task rather than this function failing.
***/
dev->ev_sender = task;
set_dev_address(address, sock, dev);
if (pktinfo != NULL) {
dev->attributes |= ISC_SOCKEVENTATTR_PKTINFO;
dev->pktinfo = *pktinfo;
}
/*
* 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);
}
/*
* If the read queue is empty, try to do the I/O right now.
*/
was_empty = ISC_LIST_EMPTY(sock->send_list);
if (!was_empty)
goto queue;
if (sock->send_result != ISC_R_SUCCESS) {
send_senddone_event(sock, &dev, sock->send_result);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
switch (doio_send(sock, dev)) {
case DOIO_SOFT:
goto queue;
case DOIO_HARD:
case DOIO_UNEXPECTED:
case DOIO_SUCCESS:
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
queue:
/*
* We couldn't send all or part of the request right now, so queue
* it.
*/
isc_task_attach(task, &ntask);
dev->attributes |= ISC_SOCKEVENTATTR_ATTACHED;
/*
* Enqueue the request. If the socket was previously not being
* watched, poke the watcher to start paying attention to it.
*/
ISC_LIST_ENQUEUE(sock->send_list, dev, ev_link);
if (was_empty)
select_poke(sock->manager, sock->fd);
XTRACE(TRACE_SEND,
("isc_socket_send: queued event %p, task %p\n", dev, ntask));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_bind(isc_socket_t *sock, isc_sockaddr_t *sockaddr)
{
int on = 1;
LOCK(&sock->lock);
if (setsockopt(sock->fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on,
sizeof on) < 0) {
UNEXPECTED_ERROR(__FILE__, __LINE__, "setsockopt(%d) failed",
sock->fd);
/* Press on... */
}
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:
UNEXPECTED_ERROR(__FILE__, __LINE__,
"bind: %s", strerror(errno));
return (ISC_R_UNEXPECTED);
}
}
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* 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)
{
REQUIRE(VALID_SOCKET(sock));
LOCK(&sock->lock);
REQUIRE(!sock->listener);
REQUIRE(sock->type == isc_sockettype_tcp);
if (backlog == 0)
backlog = SOMAXCONN;
if (listen(sock->fd, (int)backlog) < 0) {
UNLOCK(&sock->lock);
UNEXPECTED_ERROR(__FILE__, __LINE__, "listen: %s",
strerror(errno));
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, void *arg)
{
isc_socket_newconnev_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
isc_socket_t *nsock;
isc_result_t ret;
XENTER(TRACE_LISTEN, "isc_socket_accept");
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);
ret = allocate_socket(manager, sock->type, &nsock);
if (ret != ISC_R_SUCCESS) {
isc_event_free((isc_event_t **)&dev);
UNLOCK(&sock->lock);
return (ret);
}
/*
* 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 (EMPTY(sock->accept_list))
select_poke(manager, sock->fd);
ISC_LIST_ENQUEUE(sock->accept_list, dev, ev_link);
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, void *arg)
{
isc_socket_connev_t *dev;
isc_task_t *ntask = NULL;
isc_socketmgr_t *manager;
int cc;
XENTER(TRACE_CONNECT, "isc_socket_connect");
REQUIRE(VALID_SOCKET(sock));
REQUIRE(addr != NULL);
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
REQUIRE(addr != NULL);
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) {
case ECONNREFUSED:
dev->result = ISC_R_CONNREFUSED;
goto err_exit;
case ENETUNREACH:
dev->result = ISC_R_NETUNREACH;
goto err_exit;
}
sock->connected = 0;
UNEXPECTED_ERROR(__FILE__, __LINE__,
"%s", strerror(errno));
UNLOCK(&sock->lock);
isc_event_free((isc_event_t **)&dev);
return (ISC_R_UNEXPECTED);
err_exit:
sock->connected = 0;
isc_task_send(task, (isc_event_t **)&dev);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* If connect completed, fire off the done event
*/
if (cc == 0) {
sock->connected = 1;
dev->result = ISC_R_SUCCESS;
isc_task_send(task, (isc_event_t **)&dev);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
queue:
XTRACE(TRACE_CONNECT, ("queueing connect internal event\n"));
/*
* Attach to 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);
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;
UNUSED(me);
INSIST(ev->ev_type == ISC_SOCKEVENT_INTW);
sock = ev->ev_sender;
INSIST(VALID_SOCKET(sock));
LOCK(&sock->lock);
XTRACE(TRACE_CONNECT,
("internal_connect called, locked parent sock %p\n", sock));
/*
* 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);
UNLOCK(&sock->lock);
return;
}
/*
* Translate other errors into ISC_R_* flavors.
*/
switch (errno) {
case ETIMEDOUT:
dev->result = ISC_R_TIMEDOUT;
break;
case ECONNREFUSED:
dev->result = ISC_R_CONNREFUSED;
break;
case ENETUNREACH:
dev->result = ISC_R_NETUNREACH;
break;
default:
dev->result = ISC_R_UNEXPECTED;
UNEXPECTED_ERROR(__FILE__, __LINE__,
"internal_connect: connect() %s",
strerror(errno));
}
} else
dev->result = ISC_R_SUCCESS;
sock->connect_ev = NULL;
UNLOCK(&sock->lock);
task = dev->ev_sender;
dev->ev_sender = sock;
isc_task_sendanddetach(&task, (isc_event_t **)&dev);
}
isc_result_t
isc_socket_getpeername(isc_socket_t *sock, isc_sockaddr_t *addressp)
{
REQUIRE(VALID_SOCKET(sock));
REQUIRE(addressp != NULL);
LOCK(&sock->lock);
*addressp = sock->address;
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_getsockname(isc_socket_t *sock, isc_sockaddr_t *addressp)
{
ISC_SOCKADDR_LEN_T len;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(addressp != NULL);
LOCK(&sock->lock);
len = sizeof addressp->type;
if (getsockname(sock->fd, &addressp->type.sa, (void *)&len) < 0) {
UNEXPECTED_ERROR(__FILE__, __LINE__,
"getsockname: %s", strerror(errno));
UNLOCK(&sock->lock);
return (ISC_R_UNEXPECTED);
}
addressp->length = (unsigned int)len;
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* 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)
{
isc_boolean_t poke_needed;
REQUIRE(VALID_SOCKET(sock));
/*
* Quick exit if there is nothing to do. Don't even bother locking
* in this case.
*/
if (how == 0)
return;
poke_needed = ISC_FALSE;
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)
&& !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))
send_recvdone_event(sock, &dev,
ISC_R_CANCELED);
dev = next;
}
}
if (((how & ISC_SOCKCANCEL_SEND) == ISC_SOCKCANCEL_SEND)
&& !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))
send_senddone_event(sock, &dev,
ISC_R_CANCELED);
dev = next;
}
}
if (((how & ISC_SOCKCANCEL_ACCEPT) == ISC_SOCKCANCEL_ACCEPT)
&& !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_t **)&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_t **)&dev);
}
}
/*
* Need to guess if we need to poke or not... XXX
*/
select_poke(sock->manager, sock->fd);
UNLOCK(&sock->lock);
}
isc_result_t
isc_socket_recvmark(isc_socket_t *sock,
isc_task_t *task, isc_taskaction_t action, void *arg)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
LOCK(&sock->lock);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_RECVMARK, action, arg);
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
dev->result = ISC_R_SUCCESS;
dev->minimum = 0;
/*
* If the queue is empty, simply return the last error we got on
* this socket as the result code, and send off the done event.
*/
if (EMPTY(sock->recv_list)) {
send_recvdone_event(sock, &dev, sock->recv_result);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* Bad luck. The queue wasn't empty. Insert this in the proper
* place.
*/
isc_task_attach(task, &ntask);
dev->ev_sender = ntask;
ISC_LIST_ENQUEUE(sock->recv_list, dev, ev_link);
XTRACE(TRACE_RECV,
("isc_socket_recvmark: queued event dev %p, task %p\n",
dev, task));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_socket_sendmark(isc_socket_t *sock,
isc_task_t *task, isc_taskaction_t action, void *arg)
{
isc_socketevent_t *dev;
isc_socketmgr_t *manager;
isc_task_t *ntask = NULL;
REQUIRE(VALID_SOCKET(sock));
REQUIRE(task != NULL);
REQUIRE(action != NULL);
manager = sock->manager;
REQUIRE(VALID_MANAGER(manager));
LOCK(&sock->lock);
dev = allocate_socketevent(sock, ISC_SOCKEVENT_SENDMARK, action, arg);
if (dev == NULL) {
UNLOCK(&sock->lock);
return (ISC_R_NOMEMORY);
}
dev->result = ISC_R_SUCCESS;
dev->minimum = 0;
/*
* If the queue is empty, simply return the last error we got on
* this socket as the result code, and send off the done event.
*/
if (EMPTY(sock->send_list)) {
send_senddone_event(sock, &dev, sock->send_result);
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
/*
* Bad luck. The queue wasn't empty. Insert this in the proper
* place.
*/
isc_task_attach(task, &ntask);
dev->ev_sender = ntask;
ISC_LIST_ENQUEUE(sock->send_list, dev, ev_link);
XTRACE(TRACE_SEND,
("isc_socket_sendmark: queued event dev %p, task %p\n",
dev, task));
UNLOCK(&sock->lock);
return (ISC_R_SUCCESS);
}
isc_sockettype_t
isc_socket_gettype(isc_socket_t *sock)
{
REQUIRE(VALID_SOCKET(sock));
return (sock->type);
}
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