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net.c
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net.c
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/*
Copyright 2015 Bloomberg Finance L.P.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#define NODELAY
#define NOLINGER
#ifdef __linux__
#define TCPBUFSZ
#endif
#include <errno.h>
#include <netdb.h>
#include <unistd.h>
#include <signal.h>
#ifdef __sun
#include <siginfo.h>
#endif
#include <fcntl.h>
#ifdef _AIX
#include <sys/socket.h>
#include <sys/socketvar.h>
#endif
#include <netinet/tcp.h>
#include <utime.h>
#include <sys/time.h>
#include <poll.h>
#include <bb_oscompat.h>
#include <compat.h>
#include <pool.h>
#include <assert.h>
#include <crc32c.h>
#include "locks_wrap.h"
#include "net.h"
#include "net_int.h"
/* rtcpu.h breaks dbx on sun */
#ifndef NET_DEBUG
#include <rtcpu.h>
#endif
#include <endian_core.h>
#include <compile_time_assert.h>
#include <portmuxapi.h>
#include <epochlib.h>
#include <str0.h>
#include <util.h>
#include "intern_strings.h"
#include "rtcpu.h"
#include "mem_net.h"
#include "mem_override.h"
#include <bdb_net.h>
#include "debug_switches.h"
#include "thrman.h"
#include "thread_util.h"
#include <timer_util.h>
#include <comdb2_atomic.h>
#ifdef UDP_DEBUG
static int curr_udp_cnt = 0;
#endif
#define MILLION 1000000
#define BILLION 1000000000
extern int gbl_pmux_route_enabled;
extern int gbl_exit;
extern int gbl_net_portmux_register_interval;
extern int gbl_accept_on_child_nets;
extern int gbl_server_admin_mode;
extern void myfree(void *ptr);
extern int db_is_exiting(void);
int gbl_verbose_net = 0;
int gbl_dump_net_queue_on_partial_write = 0;
int gbl_debug_partial_write = 0;
int subnet_blackout_timems = 5000;
int gbl_net_maxconn = 0;
#ifdef PER_THREAD_MALLOC
#define HOST_MALLOC(h, sz) ((gbl_libevent) ? malloc((sz)) : comdb2_malloc((h)->msp, (sz)))
#else
#define HOST_MALLOC(h, sz) malloc(sz)
#endif /* PER_THREAD_MALLOC */
static int net_flush(host_node_type *host_node_ptr)
{
return gbl_libevent ? net_flush_evbuffer(host_node_ptr)
: sbuf2flush(host_node_ptr->sb);
}
void net_set_subnet_blackout(int ms)
{
if (ms >= 0) {
subnet_blackout_timems = ms;
}
}
static unsigned long long gettmms(void)
{
struct timeval tm;
gettimeofday(&tm, NULL);
return 1000 * ((unsigned long long)tm.tv_sec) +
((unsigned long long)tm.tv_usec) / 1000;
}
static int sbuf2read_wrapper(SBUF2 *sb, char *buf, int nbytes)
{
if (debug_switch_verbose_sbuf())
logmsg(LOGMSG_USER, "reading, reading %llu\n", gettmms());
return sbuf2unbufferedread(sb, buf, nbytes);
}
static int sbuf2write_wrapper(SBUF2 *sb, const char *buf, int nbytes)
{
if (debug_switch_verbose_sbuf())
logmsg(LOGMSG_USER, "writing, writing %llu\n", gettmms());
return sbuf2unbufferedwrite(sb, buf, nbytes);
}
/* Help me build the test program... - Sam J */
#ifdef TEST
static void myfree(void *ptr)
{
if (ptr)
free(ptr);
}
#endif
static sanc_node_type *add_to_sanctioned_nolock(netinfo_type *netinfo_ptr,
const char hostname[],
int portnum);
static int process_hello_common(netinfo_type *netinfo_ptr,
host_node_type *host_node_ptr,
int look_for_magic);
static int process_hello(netinfo_type *netinfo_ptr,
host_node_type *host_node_ptr);
static int process_hello_reply(netinfo_type *netinfo_ptr,
host_node_type *host_node_ptr);
static int connect_to_host(netinfo_type *netinfo_ptr,
host_node_type *host_node_ptr,
host_node_type *sponsor_host);
static int read_connect_message(SBUF2 *sb, char hostname[], int hostnamel,
int *portnum, netinfo_type *netinfo_ptr);
static void *accept_thread(void *arg);
static void *heartbeat_send_thread(void *arg);
static void *heartbeat_check_thread(void *arg);
static void *writer_thread(void *args);
static void *reader_thread(void *arg);
static void *connect_thread(void *arg);
static int net_writes(SBUF2 *sb, const char *buf, int nbytes);
static int net_reads(SBUF2 *sb, char *buf, int nbytes);
static watchlist_node_type *get_watchlist_node(SBUF2 *, const char *funcname);
int sbuf2ungetc(char c, SBUF2 *sb);
static int net_portmux_hello(void *);
/* Endian manipulation routines */
static uint8_t *net_connect_message_put(const connect_message_type *msg_ptr,
uint8_t *p_buf,
const uint8_t *p_buf_end)
{
int node = 0;
if (p_buf_end < p_buf || NET_CONNECT_MESSAGE_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_no_net_put(&(msg_ptr->to_hostname),
sizeof(msg_ptr->to_hostname), p_buf, p_buf_end);
p_buf = buf_put(&(msg_ptr->to_portnum), sizeof(msg_ptr->to_portnum), p_buf,
p_buf_end);
p_buf =
buf_put(&(msg_ptr->flags), sizeof(msg_ptr->flags), p_buf, p_buf_end);
p_buf = buf_no_net_put(&(msg_ptr->from_hostname),
sizeof(msg_ptr->from_hostname), p_buf, p_buf_end);
p_buf = buf_put(&(msg_ptr->from_portnum), sizeof(msg_ptr->from_portnum), p_buf,
p_buf_end);
p_buf = buf_put(&node, sizeof(msg_ptr->from_nodenum), p_buf, p_buf_end);
return p_buf;
}
const uint8_t *net_connect_message_get(connect_message_type *msg_ptr,
const uint8_t *p_buf,
const uint8_t *p_buf_end)
{
int node = 0;
if (p_buf_end < p_buf || NET_CONNECT_MESSAGE_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_no_net_get(&(msg_ptr->to_hostname),
sizeof(msg_ptr->to_hostname), p_buf, p_buf_end);
p_buf = buf_get(&(msg_ptr->to_portnum), sizeof(msg_ptr->to_portnum), p_buf,
p_buf_end);
p_buf =
buf_get(&(msg_ptr->flags), sizeof(msg_ptr->flags), p_buf, p_buf_end);
p_buf = buf_no_net_get(&(msg_ptr->from_hostname),
sizeof(msg_ptr->from_hostname), p_buf, p_buf_end);
p_buf = buf_get(&(msg_ptr->from_portnum), sizeof(msg_ptr->from_portnum), p_buf,
p_buf_end);
p_buf = buf_get(&node, sizeof(msg_ptr->from_nodenum), p_buf, p_buf_end);
return p_buf;
}
uint8_t *net_wire_header_put(const wire_header_type *header_ptr, uint8_t *p_buf,
const uint8_t *p_buf_end)
{
int node = 0;
if (p_buf_end < p_buf || NET_WIRE_HEADER_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_no_net_put(&(header_ptr->fromhost),
sizeof(header_ptr->fromhost), p_buf, p_buf_end);
p_buf = buf_put(&(header_ptr->fromport), sizeof(header_ptr->fromport),
p_buf, p_buf_end);
p_buf = buf_put(&node, sizeof(header_ptr->fromnode), p_buf, p_buf_end);
p_buf = buf_no_net_put(&(header_ptr->tohost), sizeof(header_ptr->tohost),
p_buf, p_buf_end);
p_buf = buf_put(&(header_ptr->toport), sizeof(header_ptr->toport), p_buf,
p_buf_end);
p_buf = buf_put(&node, sizeof(header_ptr->tonode), p_buf, p_buf_end);
p_buf = buf_put(&(header_ptr->type), sizeof(header_ptr->type), p_buf,
p_buf_end);
return p_buf;
}
const uint8_t *net_wire_header_get(wire_header_type *header_ptr,
const uint8_t *p_buf,
const uint8_t *p_buf_end)
{
int node = 0;
if (p_buf_end < p_buf || NET_WIRE_HEADER_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_no_net_get(&(header_ptr->fromhost),
sizeof(header_ptr->fromhost), p_buf, p_buf_end);
p_buf = buf_get(&(header_ptr->fromport), sizeof(header_ptr->fromport),
p_buf, p_buf_end);
p_buf = buf_get(&node, sizeof(header_ptr->fromnode), p_buf, p_buf_end);
p_buf = buf_no_net_get(&(header_ptr->tohost), sizeof(header_ptr->tohost),
p_buf, p_buf_end);
p_buf = buf_get(&(header_ptr->toport), sizeof(header_ptr->toport), p_buf,
p_buf_end);
p_buf = buf_get(&node, sizeof(header_ptr->tonode), p_buf, p_buf_end);
p_buf = buf_get(&(header_ptr->type), sizeof(header_ptr->type), p_buf,
p_buf_end);
return p_buf;
}
uint8_t *net_send_message_header_put(const net_send_message_header *header_ptr,
uint8_t *p_buf, const uint8_t *p_buf_end)
{
if (p_buf_end < p_buf || NET_SEND_MESSAGE_HEADER_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_put(&(header_ptr->usertype), sizeof(header_ptr->usertype),
p_buf, p_buf_end);
p_buf = buf_put(&(header_ptr->seqnum), sizeof(header_ptr->seqnum), p_buf,
p_buf_end);
p_buf = buf_put(&(header_ptr->waitforack), sizeof(header_ptr->waitforack),
p_buf, p_buf_end);
p_buf = buf_put(&(header_ptr->datalen), sizeof(header_ptr->datalen), p_buf,
p_buf_end);
return p_buf;
}
const uint8_t *net_send_message_header_get(net_send_message_header *header_ptr,
const uint8_t *p_buf,
const uint8_t *p_buf_end)
{
if (p_buf_end < p_buf || NET_SEND_MESSAGE_HEADER_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_get(&(header_ptr->usertype), sizeof(header_ptr->usertype),
p_buf, p_buf_end);
p_buf = buf_get(&(header_ptr->seqnum), sizeof(header_ptr->seqnum), p_buf,
p_buf_end);
p_buf = buf_get(&(header_ptr->waitforack), sizeof(header_ptr->waitforack),
p_buf, p_buf_end);
p_buf = buf_get(&(header_ptr->datalen), sizeof(header_ptr->datalen), p_buf,
p_buf_end);
return p_buf;
}
static uint8_t *net_ack_message_payload_type_put(
const net_ack_message_payload_type *payload_type_ptr, uint8_t *p_buf,
const uint8_t *p_buf_end)
{
if (p_buf_end < p_buf || (NET_ACK_MESSAGE_PAYLOAD_TYPE_LEN +
payload_type_ptr->paylen) > (p_buf_end - p_buf))
return NULL;
p_buf = buf_put(&(payload_type_ptr->seqnum),
sizeof(payload_type_ptr->seqnum), p_buf, p_buf_end);
p_buf = buf_put(&(payload_type_ptr->outrc), sizeof(payload_type_ptr->outrc),
p_buf, p_buf_end);
p_buf = buf_put(&(payload_type_ptr->paylen),
sizeof(payload_type_ptr->paylen), p_buf, p_buf_end);
return p_buf;
}
const uint8_t *
net_ack_message_payload_type_get(net_ack_message_payload_type *payload_type_ptr,
const uint8_t *p_buf, const uint8_t *p_buf_end)
{
if (p_buf_end < p_buf ||
NET_ACK_MESSAGE_PAYLOAD_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_get(&(payload_type_ptr->seqnum),
sizeof(payload_type_ptr->seqnum), p_buf, p_buf_end);
p_buf = buf_get(&(payload_type_ptr->outrc), sizeof(payload_type_ptr->outrc),
p_buf, p_buf_end);
p_buf = buf_get(&(payload_type_ptr->paylen),
sizeof(payload_type_ptr->paylen), p_buf, p_buf_end);
return p_buf;
}
static const uint8_t *
net_ack_message_type_put(const net_ack_message_type *p_net_ack_message_type,
uint8_t *p_buf, const uint8_t *p_buf_end)
{
if (p_buf_end < p_buf || NET_ACK_MESSAGE_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_put(&(p_net_ack_message_type->seqnum),
sizeof(p_net_ack_message_type->seqnum), p_buf, p_buf_end);
p_buf = buf_put(&(p_net_ack_message_type->outrc),
sizeof(p_net_ack_message_type->outrc), p_buf, p_buf_end);
return p_buf;
}
const uint8_t *
net_ack_message_type_get(net_ack_message_type *p_net_ack_message_type,
const uint8_t *p_buf, const uint8_t *p_buf_end)
{
if (p_buf_end < p_buf || NET_ACK_MESSAGE_TYPE_LEN > (p_buf_end - p_buf))
return NULL;
p_buf = buf_get(&(p_net_ack_message_type->seqnum),
sizeof(p_net_ack_message_type->seqnum), p_buf, p_buf_end);
p_buf = buf_get(&(p_net_ack_message_type->outrc),
sizeof(p_net_ack_message_type->outrc), p_buf, p_buf_end);
return p_buf;
}
typedef struct connect_and_accept {
netinfo_type *netinfo_ptr;
SBUF2 *sb;
struct in_addr addr;
} connect_and_accept_t;
/* Close socket related to hostnode. */
static void shutdown_hostnode_socket(host_node_type *host_node_ptr)
{
if (gbl_libevent) {
return;
}
if (gbl_verbose_net) {
host_node_printf(LOGMSG_USER, host_node_ptr, "shutting down fd %d\n",
host_node_ptr->fd);
}
if (shutdown(host_node_ptr->fd, 2) != 0) {
if (errno != ENOTCONN) {
host_node_errf(LOGMSG_ERROR, host_node_ptr,
"%s: shutdown fd %d errno %d %s\n", __func__,
host_node_ptr->fd, errno, strerror(errno));
}
}
}
/* This must be called while holding the host_node_ptr->lock.
*
* This will call shutdown() on the fd, which will cause the reader & writer
* threads (if any) to error out of any blocking io and exit.
*
* If there are no reader or writer threads left then this will properly
* close the socket and sbuf.
*/
static void close_hostnode_ll(host_node_type *host_node_ptr)
{
if (!host_node_ptr->closed) {
host_node_ptr->closed = 1;
/* this has to be done before notifying the sql transactions
that connection dropped, otherwise they will race and
send stuff before the host is reconnected; transaction is
send to garbcan without notifying sql, or master, and they
will never be applied */
host_node_ptr->got_hello = 0;
shutdown_hostnode_socket(host_node_ptr);
/* wake up the writer thread if it's asleep */
Pthread_cond_signal(&(host_node_ptr->write_wakeup));
/* call the hostdown routine if provided */
if (host_node_ptr->netinfo_ptr->hostdown_rtn) {
(host_node_ptr->netinfo_ptr->hostdown_rtn)(
host_node_ptr->netinfo_ptr, host_node_ptr->host_interned);
host_node_printf(LOGMSG_DEBUG, host_node_ptr, "back from hostdown_rtn\n");
}
}
if (gbl_libevent) {
return;
}
/* If we have an fd or sbuf, and no reader or writer thread, then
* close the socket properly */
if (host_node_ptr->have_reader_thread == 0 &&
host_node_ptr->have_writer_thread == 0 &&
host_node_ptr->really_closed == 0
){
SBUF2 *sb = host_node_ptr->sb;
if (sb) {
if (sslio_has_ssl(sb))
sslio_close(sb, 1);
sbuf2close(host_node_ptr->sb);
host_node_ptr->sb = NULL;
if (gbl_verbose_net)
host_node_printf(LOGMSG_DEBUG, host_node_ptr, "closing sbuf\n");
}
if (host_node_ptr->fd >= 0) {
if (gbl_verbose_net)
host_node_printf(LOGMSG_DEBUG, host_node_ptr, "close fd %d\n",
host_node_ptr->fd);
if (close(host_node_ptr->fd) != 0)
host_node_errf(LOGMSG_ERROR, host_node_ptr, "%s close fd %d errno %d %s\n",
__func__, host_node_ptr->fd, errno,
strerror(errno));
host_node_ptr->fd = -1;
}
host_node_ptr->really_closed = 1;
}
}
static void close_hostnode(host_node_type *host_node_ptr)
{
Pthread_mutex_lock(&(host_node_ptr->lock));
close_hostnode_ll(host_node_ptr);
Pthread_mutex_unlock(&(host_node_ptr->lock));
}
#ifdef LIST_DEBUG
static void check_list_sizes_lk(host_node_type *host_node_ptr)
{
write_data *list_ptr;
list_ptr = host_node_ptr->write_head;
while (list_ptr) {
if (list_ptr->len > BILLION)
abort();
list_ptr = list_ptr->next;
}
}
static void check_list_sizes(host_node_type *host_node_ptr)
{
Pthread_mutex_lock(&(host_node_ptr->enquelk));
check_list_sizes_lk(host_node_ptr);
Pthread_mutex_unlock(&(host_node_ptr->enquelk));
}
#endif
void update_host_net_queue_stats(host_node_type *host_node_ptr, size_t count, size_t bytes) {
host_node_ptr->enque_count += count;
if (host_node_ptr->enque_count > host_node_ptr->peak_enque_count) {
host_node_ptr->peak_enque_count = host_node_ptr->enque_count;
host_node_ptr->peak_enque_count_time = comdb2_time_epoch();
}
host_node_ptr->enque_bytes += bytes;
if (host_node_ptr->enque_bytes > host_node_ptr->peak_enque_bytes) {
host_node_ptr->peak_enque_bytes = host_node_ptr->enque_bytes;
host_node_ptr->peak_enque_bytes_time = comdb2_time_epoch();
}
}
int gbl_print_net_queue_size = 0;
/* Enque a net message consisting of a header and some optional data.
* The caller should hold the enque lock.
* Note that dataptr1==NULL => datasz1==0 and dataptr2==NULL => datasz2==0
*/
static int write_list(netinfo_type *netinfo_ptr, host_node_type *host_node_ptr,
const wire_header_type *headptr, const struct iovec *iov,
int iovcount, int flags)
{
if (gbl_libevent) {
return write_list_evbuffer(host_node_ptr, headptr->type, iov, iovcount, flags);
}
write_data *insert;
int ii;
size_t datasz;
char *ptr;
int rc;
Pthread_mutex_lock(&(host_node_ptr->enquelk));
/* let 1 message always slip in */
if (host_node_ptr->enque_count) {
if ((flags & WRITE_MSG_NOLIMIT) == 0 &&
((host_node_ptr->enque_count > netinfo_ptr->max_queue) ||
(host_node_ptr->enque_bytes > netinfo_ptr->max_bytes))) {
host_node_ptr->num_queue_full++;
rc = -2;
goto out;
}
}
/* Although generic, this logic was really added to ensure that we
* don't double enque heartbeat messages. Not sure how much this really
* happens in practice. */
if ((flags & WRITE_MSG_NODUPE) != 0 && host_node_ptr->write_head) {
const wire_header_type *newitem = headptr;
wire_header_type *headitem = &host_node_ptr->write_head->payload.header;
if (newitem->type == headitem->type) {
/* Dedupe this item */
host_node_ptr->dedupe_count++;
rc = 0;
goto out;
}
}
Pthread_mutex_unlock(&(host_node_ptr->enquelk));
for (datasz = 0, ii = 0; ii < iovcount; ii++) {
if (iov[ii].iov_base)
datasz += iov[ii].iov_len;
}
if (netinfo_ptr->myhostname_len > HOSTNAME_LEN)
datasz += netinfo_ptr->myhostname_len;
if (host_node_ptr->hostname_len > HOSTNAME_LEN)
datasz += host_node_ptr->hostname_len;
time_metric_add(host_node_ptr->metric_queue_size, datasz);
/* Malloc space for the list item struct (which includes the net message
* header) and all the data in our iovec. */
insert = HOST_MALLOC(host_node_ptr, sizeof(write_data) + datasz);
if (insert == NULL) {
logmsg(LOGMSG_ERROR, "%s: %s: %zu\n", __func__, strerror(errno),
datasz);
return -1;
}
insert->flags = flags;
insert->enque_time = comdb2_time_epoch();
insert->next = NULL;
insert->prev = NULL;
insert->len = sizeof(wire_header_type) + datasz;
memcpy(&insert->payload.header, headptr, sizeof(wire_header_type));
ptr = insert->payload.raw + sizeof(wire_header_type);
// start = insert->payload.raw;
/* if we have long hostnames, account for them here */
if (netinfo_ptr->myhostname_len > HOSTNAME_LEN) {
memcpy(ptr, netinfo_ptr->myhostname, netinfo_ptr->myhostname_len);
ptr += netinfo_ptr->myhostname_len;
}
if (host_node_ptr->hostname_len > HOSTNAME_LEN) {
memcpy(ptr, host_node_ptr->host, host_node_ptr->hostname_len);
ptr += host_node_ptr->hostname_len;
}
for (ii = 0; ii < iovcount; ii++) {
if (iov[ii].iov_base) {
memcpy(ptr, iov[ii].iov_base, iov[ii].iov_len);
ptr += iov[ii].iov_len;
}
}
Pthread_mutex_lock(&(host_node_ptr->enquelk));
if (host_node_ptr->write_head == NULL) {
host_node_ptr->write_head = host_node_ptr->write_tail = insert;
insert->next = insert->prev = NULL;
} else if (flags & WRITE_MSG_HEAD) {
/* Insert at head of list */
insert->next = host_node_ptr->write_head;
insert->prev = NULL;
host_node_ptr->write_head->prev = insert;
host_node_ptr->write_head = insert;
} else if (flags & WRITE_MSG_INORDER && netinfo_ptr->netcmp_rtn != NULL) {
int cnt = 0, cmp, reordered = 0;
write_data *ptr = host_node_ptr->write_tail;
while (ptr != NULL &&
(cmp = (netinfo_ptr->netcmp_rtn)(
netinfo_ptr, insert->payload.raw, insert->len,
ptr->payload.raw, ptr->len)) < 0 &&
cnt++ < netinfo_ptr->enque_reorder_lookahead) {
reordered = 1;
ptr = ptr->prev;
}
/* Update some stats */
if (reordered) {
netinfo_ptr->stats.reorders++;
host_node_ptr->stats.reorders++;
}
/* Insert at head */
if (ptr == NULL) {
insert->next = host_node_ptr->write_head;
insert->prev = NULL;
host_node_ptr->write_head->prev = insert;
host_node_ptr->write_head = insert;
} else {
insert->prev = ptr;
insert->next = ptr->next;
/* Normal case: will be at the tail */
if (ptr == host_node_ptr->write_tail) {
host_node_ptr->write_tail = insert;
} else {
ptr->next->prev = insert;
}
ptr->next = insert;
}
} else
{
/* Insert at tail of list */
host_node_ptr->write_tail->next = insert;
insert->prev = host_node_ptr->write_tail;
insert->next = NULL;
host_node_ptr->write_tail = insert;
}
if (netinfo_ptr->qstat_enque_rtn) {
(netinfo_ptr->qstat_enque_rtn)(netinfo_ptr, host_node_ptr->qstat,
insert->payload.raw, insert->len);
}
if (host_node_ptr->netinfo_ptr->trace && debug_switch_net_verbose())
logmsg(LOGMSG_USER, "Queing %zu bytes %llu\n", insert->len, gettmms());
update_host_net_queue_stats(host_node_ptr, 1, insert->len);
rc = 0;
out:
Pthread_mutex_unlock(&(host_node_ptr->enquelk));
return rc;
}
int read_stream(netinfo_type *netinfo_ptr, host_node_type *host_node_ptr,
SBUF2 *sb, void *inptr, int maxbytes)
{
uint8_t *ptr = inptr;
const int fd = sbuf2fileno(sb);
int nread = 0;
while (nread < maxbytes) {
if (host_node_ptr) /* not set by all callers */
host_node_ptr->timestamp = time(NULL);
int n = sbuf2unbufferedread(sb, (char *)ptr + nread, maxbytes - nread);
if (n > 0) {
nread += n;
} else if (n < 0) {
if (errno == EAGAIN) { /* wait for some data */
struct pollfd pol;
pol.fd = fd;
pol.events = POLLIN;
if (poll(&pol, 1, -1) < 0) {
break;
}
if ((pol.revents & POLLIN) == 0) {
break;
}
} else if (errno == EINTR) { /* just read again */
continue;
} else {
if (host_node_ptr)
host_node_printf(LOGMSG_USER, host_node_ptr, "%s:%s\n",
__func__, strerror(errno));
else
logmsgperror(__func__);
break;
}
} else { /* n == 0; EOF */
break;
}
}
if (nread > 0) {
if (netinfo_ptr) /* not set by all callers */
netinfo_ptr->stats.bytes_read += nread;
if (host_node_ptr)
host_node_ptr->stats.bytes_read += nread;
}
return nread;
}
/*
* Retrieve the host_node_type by name.
* Caller should be holding netinfo_ptr->lock.
*/
host_node_type *get_host_node_by_name_ll(netinfo_type *netinfo_ptr,
const char name[])
{
if (!isinterned(name))
abort();
host_node_type *ptr = NULL;
ptr = netinfo_ptr->head;
while (ptr != NULL && ptr->host != name)
ptr = ptr->next;
return ptr;
}
static uint64_t net_delayed = 0;
// 10000 * 0.1 ms = 1s
#define net_delay_mult 10000
// don't delay > 5s
#define net_delay_max (5 * net_delay_mult)
void print_netdelay(void)
{
int d = debug_switch_net_delay();
double delay = (double)d / 10; // 0.1ms -> ms
const char *status = "no";
if (d && delay <= net_delay_max)
status = "yes";
logmsg(LOGMSG_USER,
"netdelay=> delay:%.1fms delayed:%" PRIu64 " delaying:%s\n", delay,
net_delayed, status);
}
static void timeval_to_timespec(struct timeval *tv, struct timespec *ts)
{
ts->tv_sec = tv->tv_sec;
ts->tv_nsec = tv->tv_usec * 1000;
}
static void timespec_to_timeval(struct timespec *ts, struct timeval *tv)
{
tv->tv_sec = ts->tv_sec;
tv->tv_usec = ts->tv_nsec / 1000;
}
static int timeval_cmp(struct timeval *x, struct timeval *y)
{
if (x->tv_sec > y->tv_sec)
return 1;
if (x->tv_sec < y->tv_sec)
return -1;
if (x->tv_usec > y->tv_usec)
return 1;
if (x->tv_usec < y->tv_usec)
return -1;
return 0;
}
void comdb2_nanosleep(struct timespec *req)
{
struct timeval before, now, need, elapsed;
timespec_to_timeval(req, &need);
gettimeofday(&before, NULL);
do {
sched_yield();
gettimeofday(&now, NULL);
timersub(&now, &before, &elapsed);
} while (timeval_cmp(&elapsed, &need) < 0);
}
void net_delay(const char *host)
{
int delay = debug_switch_net_delay();
if (delay) {
if (delay > net_delay_max)
return;
int other_room;
struct timespec req;
time_t sec;
other_room = getroom_callback(NULL, host);
if (gbl_myroom == other_room)
return;
sec = 0;
if (delay >= net_delay_mult) {
sec = delay / net_delay_mult;
delay = delay % net_delay_mult;
}
req.tv_sec = sec;
req.tv_nsec = delay * 100000; // 0.1 ms -> ns
#ifdef _LINUX_SOURCE
// spin for delay < 10ms
if (delay < 100)
comdb2_nanosleep(&req);
else
#endif
nanosleep(&req, NULL);
++net_delayed;
}
}
static ssize_t write_stream(netinfo_type *netinfo_ptr,
host_node_type *hostinfo_ptr, SBUF2 *sb,
void *inptr, size_t maxbytes)
{
if (gbl_libevent) {
abort();
}
int nwrite = sbuf2write(inptr, maxbytes, sb);
/* Note for future - this locking seems OTT. We must already be under lock
* here or we couldn't safely use the sbuf. */
if (nwrite > 0) {
/* update these stats without lock */
netinfo_ptr->stats.bytes_written += nwrite;
if (hostinfo_ptr)
hostinfo_ptr->stats.bytes_written += nwrite;
}
return nwrite;
}
extern ssl_mode gbl_rep_ssl_mode;
extern SSL_CTX *gbl_ssl_ctx;
static int read_connect_message(SBUF2 *sb, char hostname[], int hostnamel,
int *portnum, netinfo_type *netinfo_ptr)
{
connect_message_type connect_message;
uint8_t conndata[NET_CONNECT_MESSAGE_TYPE_LEN], *p_buf, *p_buf_end;
int rc;
int hosteq = 0;
char from_hostname[256];
char to_hostname[256];
int namelen;
rc = read_stream(netinfo_ptr, NULL, sb, &conndata,
NET_CONNECT_MESSAGE_TYPE_LEN);
if (rc != NET_CONNECT_MESSAGE_TYPE_LEN)
return -1;
p_buf = conndata;
p_buf_end = (conndata + sizeof(conndata));
if (!(net_connect_message_get(&connect_message, p_buf, p_buf_end))) {
return -1;
}
/* If the hostname doesn't fit in HOSTNAME_LEN (16) characters,
* the first byte of host will be '.' followed by the name length,
* and the real hostname follows. */
if (connect_message.from_hostname[0] == '.') {
connect_message.from_hostname[HOSTNAME_LEN - 1] = 0;
namelen = atoi(&connect_message.from_hostname[1]);
if (namelen < 0 || namelen > sizeof(from_hostname)) {
logmsg(LOGMSG_WARN, "Invalid hostname length %d\n", namelen);
return 1;
}
rc = read_stream(netinfo_ptr, NULL, sb, from_hostname, namelen);
if (rc != namelen)
return -1;
} else {
strncpy0(from_hostname, connect_message.from_hostname, HOSTNAME_LEN);
}
if (connect_message.to_hostname[0] == '.') {
connect_message.to_hostname[HOSTNAME_LEN - 1] = 0;
namelen = atoi(&connect_message.to_hostname[1]);
if (namelen < 0 || namelen > sizeof(to_hostname)) {
logmsg(LOGMSG_WARN, "Invalid hostname length %d\n", namelen);
return 1;
}
rc = read_stream(netinfo_ptr, NULL, sb, to_hostname, namelen);
if (rc != namelen)
return -1;
} else {
strncpy0(to_hostname, connect_message.to_hostname, HOSTNAME_LEN);
}
if (strcmp(netinfo_ptr->myhostname, to_hostname) == 0)
hosteq = 1;
if ((!hosteq) || ((netinfo_ptr->myport != connect_message.to_portnum))) {
logmsg(LOGMSG_ERROR,
"netinfo_ptr->hostname = %s, "
"connect_message.to_hostname = %s\n",
netinfo_ptr->myhostname, to_hostname);
logmsg(LOGMSG_ERROR,
"netinfo_ptr->myport != connect_message.to_portnum %d %d\n",
netinfo_ptr->myport, connect_message.to_portnum);
logmsg(LOGMSG_ERROR, "origin: from=hostname=%s node=%d port=%d\n",
from_hostname, connect_message.from_nodenum,
connect_message.from_portnum);
logmsg(LOGMSG_ERROR, "service: %s\n", netinfo_ptr->service);
return -1;
}
if (netinfo_ptr->allow_rtn &&
!netinfo_ptr->allow_rtn(netinfo_ptr, intern(from_hostname))) {
logmsg(LOGMSG_ERROR,
"received connection from node %d, hostname %s which is not "
"allowed\n",
connect_message.from_nodenum, from_hostname);
return -2;
}
strncpy(hostname, from_hostname, hostnamel);
*portnum = connect_message.from_portnum;
if (connect_message.flags & CONNECT_MSG_SSL) {
if (!SSL_IS_ABLE(gbl_rep_ssl_mode)) {
/* Reject if mis-configured. */
logmsg(LOGMSG_ERROR,
"Misconfiguration: Peer requested SSL, "
"but I don't have an SSL key pair.\n");
return -1;
}
rc = sslio_accept(sb, gbl_ssl_ctx, gbl_rep_ssl_mode, gbl_dbname,
gbl_nid_dbname, 1);
if (rc != 1) {
char err[256];
sbuf2lasterror(sb, err, sizeof(err));
logmsg(LOGMSG_ERROR, "%s\n", err);
return -1;
}
} else if (SSL_IS_REQUIRED(gbl_rep_ssl_mode)) {
/* Reject if I require SSL. */
logmsg(LOGMSG_WARN,
"Replicant SSL connections are required.\n");
return -1;
}
return 0;
}
static int empty_write_list(host_node_type *host_node_ptr)
{
write_data *ptr, *nxt;
Pthread_mutex_lock(&(host_node_ptr->enquelk));
nxt = ptr = host_node_ptr->write_head;
while (nxt != NULL) {
ptr = ptr->next;
free(nxt);
nxt = ptr;
}
host_node_ptr->write_head = host_node_ptr->write_tail = NULL;
host_node_ptr->enque_count = 0;
host_node_ptr->enque_bytes = 0;
Pthread_mutex_unlock(&(host_node_ptr->enquelk));
return 0;
}
int write_connect_message(netinfo_type *netinfo_ptr,
host_node_type *host_node_ptr, SBUF2 *sb)
{
connect_message_type connect_message;
uint8_t conndata[NET_CONNECT_MESSAGE_TYPE_LEN] = {0}, *p_buf, *p_buf_end;
int rc;