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sync.c
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sync.c
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/* $Id: sync.c,v 1.86 2009/05/23 22:50:53 manu Exp $ */
/*
* Copyright (c) 2004-2007 Emmanuel Dreyfus
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Emmanuel Dreyfus
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#ifdef HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#ifdef __RCSID
__RCSID("$Id: sync.c,v 1.86 2009/05/23 22:50:53 manu Exp $");
#endif
#endif
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include <pthread.h>
#include <syslog.h>
#include <sysexits.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "pending.h"
#include "sync.h"
#include "conf.h"
#include "milter-greylist.h"
#ifdef USE_DMALLOC
#include <dmalloc.h>
#endif
#define SYNC_PROTO_CURRENT 3
struct sync_master_sock {
int runs;
int sock;
};
#define SMS_RUNNING 1
#define SMS_NOTRUNNING 0
#define SMS_DISABLED -1
/* errors returned by stdio that should not cause an exit */
static int sync_ignored_errno[] = {
#ifdef EAGAIN
EAGAIN,
#endif /* EAGAIN */
#ifdef ECONNABORTED
ECONNABORTED,
#endif /* ECONNABORTED */
#ifdef EMFILE
EMFILE,
#endif /* EMFILE */
#ifdef ENFILE
ENFILE,
#endif /* ENFILE */
#ifdef ENOBUFS
ENOBUFS,
#endif /* ENOBUFS */
#ifdef ENOMEM
ENOMEM,
#endif /* ENOMEM */
#ifdef ENOSR
ENOSR,
#endif /* ENOSR */
#ifdef EWOULDBLOCK
EWOULDBLOCK,
#endif /* EWOULDBLOCK */
0,
};
static pthread_mutex_t sync_master_lock = PTHREAD_MUTEX_INITIALIZER;
struct sync_master_sock sync_master4 = { 0, -1 };
struct sync_master_sock sync_master6 = { 0, -1 };
struct peerlist peer_head;
pthread_rwlock_t peer_lock; /* For the peer list */
static pthread_mutex_t sync_dirty_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t sync_sleepflag = PTHREAD_COND_INITIALIZER;
static int sync_dirty = 0;
static void sync_listen(char *, char *, struct sync_master_sock *);
static int local_addr(const struct sockaddr *sa, const socklen_t salen);
static int sync_queue_poke(struct peer *, struct sync *);
static struct sync * sync_queue_peek(struct peer *);
static int select_protocol(struct peer *, int, FILE *);
static void sync_vers(FILE *, int);
static int is_fatal(int);
void
peer_init(void) {
int error;
LIST_INIT(&peer_head);
if ((error = pthread_rwlock_init(&peer_lock, NULL)) != 0) {
mg_log(LOG_ERR,
"pthread_rwlock_init failed: %s", strerror(error));
exit(EX_OSERR);
}
return;
}
void
peer_clear(void) {
struct peer *peer;
struct sync *sync;
PEER_WRLOCK;
while(!LIST_EMPTY(&peer_head)) {
peer = LIST_FIRST(&peer_head);
while((sync = sync_queue_peek(peer)) != NULL)
sync_free(sync);
if (peer->p_stream != NULL)
Fclose(peer->p_stream);
LIST_REMOVE(peer, p_list);
pthread_mutex_destroy(&peer->p_mtx);
free(peer->p_name);
free(peer);
}
PEER_UNLOCK;
return;
}
void
peer_add(peername, sockettimeout)
char *peername;
time_t sockettimeout;
{
struct peer *peer;
if ((peer = malloc(sizeof(*peer))) == NULL ||
(peer->p_name = strdup(peername)) == NULL) {
mg_log(LOG_ERR, "cannot add peer: %s", strerror(errno));
exit(EX_OSERR);
}
peer->p_qlen = 0;
peer->p_stream = NULL;
peer->p_flags = 0;
peer->p_socket_timeout = sockettimeout;
TAILQ_INIT(&peer->p_deferred);
pthread_mutex_init(&peer->p_mtx, NULL);
PEER_WRLOCK;
LIST_INSERT_HEAD(&peer_head, peer, p_list);
PEER_UNLOCK;
if (conf.c_debug)
mg_log(LOG_DEBUG, "load peer %s", peer->p_name);
return;
}
void
peer_create(pending)
struct pending *pending;
{
struct peer *peer;
PEER_RDLOCK;
if (LIST_EMPTY(&peer_head))
goto out;
LIST_FOREACH(peer, &peer_head, p_list)
sync_queue(peer, PS_CREATE, pending, -1); /* -1: unused */
out:
PEER_UNLOCK;
return;
}
void
peer_delete(pending, autowhite)
struct pending *pending;
time_t autowhite;
{
struct peer *peer;
PEER_RDLOCK;
if (LIST_EMPTY(&peer_head))
goto out;
LIST_FOREACH(peer, &peer_head, p_list)
sync_queue(peer, PS_DELETE, pending, autowhite);
out:
PEER_UNLOCK;
return;
}
static int
sync_queue_poke(peer, sync)
struct peer *peer;
struct sync *sync;
{
int r = 0;
pthread_mutex_lock(&peer->p_mtx);
if (peer->p_qlen < conf.c_syncmaxqlen) {
TAILQ_INSERT_HEAD(&peer->p_deferred, sync, s_list);
peer->p_qlen++;
r = 1;
}
pthread_mutex_unlock(&peer->p_mtx);
return r;
}
static struct sync *
sync_queue_peek(peer)
struct peer *peer;
{
struct sync *sync;
pthread_mutex_lock(&peer->p_mtx);
sync = TAILQ_FIRST(&peer->p_deferred);
if (!TAILQ_EMPTY(&peer->p_deferred)) {
TAILQ_REMOVE(&peer->p_deferred, sync, s_list);
peer->p_qlen--;
}
pthread_mutex_unlock(&peer->p_mtx);
return sync;
}
int
sync_send(peer, type, pending, autowhite) /* peer list is read-locked */
struct peer *peer;
peer_sync_t type;
struct pending *pending;
time_t autowhite;
{
char sep[] = " \n\t\r";
char *replystr;
int replycode;
char line[LINELEN + 1];
char *cookie = NULL;
char *keyw;
char awstr[LINELEN + 1];
int bw;
int errcount = 0;
if ((peer->p_stream == NULL) && (peer_connect(peer) != 0))
return -1;
*line = '\0';
switch(type) {
case PS_FLUSH:
bw = snprintf(line, LINELEN, "flush addr %s\r\n",
pending->p_addr);
break;
case PS_CREATE:
bw = snprintf(line, LINELEN, "add addr %s from %s "
"rcpt %s date %ld\r\n", pending->p_addr,
pending->p_from, pending->p_rcpt,
(long)pending->p_tv.tv_sec);
break;
default:
if (peer->p_vers >= 2) {
keyw = "del2";
snprintf(awstr, LINELEN, " aw %ld", (long)autowhite);
} else {
keyw = "del";
awstr[0] = '\0';
}
bw = snprintf(line, LINELEN, "%s addr %s from %s "
"rcpt %s date %ld%s\r\n", keyw, pending->p_addr,
pending->p_from, pending->p_rcpt,
(long)pending->p_tv.tv_sec, awstr);
break;
}
if (bw > LINELEN) {
mg_log(LOG_ERR, "closing connection with peer %s: "
"send buffer would overflow (%d entries queued)",
peer->p_name, peer->p_qlen);
Fclose(peer->p_stream);
peer->p_stream = NULL;
return -1;
}
bw = fprintf(peer->p_stream, "%s", line);
if (bw != strlen(line)) {
mg_log(LOG_ERR, "closing connection with peer %s: "
"%s (%d entries queued) - I was unable to send "
"complete line \"%s\" - bytes written: %i",
peer->p_name, strerror(errno), peer->p_qlen,
line, bw);
Fclose(peer->p_stream);
peer->p_stream = NULL;
return -1;
}
fflush(peer->p_stream);
/*
* Check the return code
*/
get_more:
sync_waitdata(peer->p_socket, peer->p_socket_timeout);
if (fgets(line, LINELEN, peer->p_stream) == NULL) {
if (errno == EAGAIN) {
errcount++;
if ( feof(peer->p_stream) ) {
mg_log(LOG_ERR, "lost connection with peer %s: "
"%s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
Fclose(peer->p_stream);
peer->p_stream = NULL;
return -1;
}
if (errcount < 5) {
goto get_more;
} else {
mg_log(LOG_ERR, "too many read error with peer %s", peer->p_name);
}
}
mg_log(LOG_ERR, "lost connection with peer %s: "
"%s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
Fclose(peer->p_stream);
peer->p_stream = NULL;
return -1;
}
/*
* On some systems, opening a stream on a socket introduce
* weird behavior: the in and out buffers get mixed up.
* By calling fflush() after each read operation, we fix that
*/
fflush(peer->p_stream);
if ((replystr = strtok_r(line, sep, &cookie)) == NULL) {
mg_log(LOG_ERR, "Unexpected reply \"%s\" from %s, "
"closing connection (%d entries queued)",
line, peer->p_name, peer->p_qlen);
Fclose(peer->p_stream);
peer->p_stream = NULL;
return -1;
}
replycode = atoi(replystr);
if (replycode != 201) {
mg_log(LOG_ERR, "Unexpected reply \"%s\" from %s, "
"closing connection (%d entries queued)",
line, peer->p_name, peer->p_qlen);
Fclose(peer->p_stream);
peer->p_stream = NULL;
return -1;
}
if (conf.c_debug)
mg_log(LOG_DEBUG, "sync one entry with %s", peer->p_name);
return 0;
}
int
peer_connect(peer) /* peer list is read-locked */
struct peer *peer;
{
struct servent *se;
#ifdef HAVE_GETADDRINFO
struct addrinfo hints, *res0, *res;
int err;
#else
struct protoent *pe;
int proto;
sockaddr_t raddr;
socklen_t raddrlen;
#endif
sockaddr_t laddr;
socklen_t laddrlen;
char *laddrstr;
int service;
int s = -1;
char *replystr;
int replycode;
FILE *stream;
char sep[] = " \n\t\r";
char line[LINELEN + 1];
int param;
char *cookie = NULL;
if (peer->p_stream != NULL)
mg_log(LOG_ERR, "peer_connect called and peer->p_stream != 0");
if (conf.c_syncport != NULL) {
service = htons(atoi(conf.c_syncport));
} else {
if ((se = getservbyname(MXGLSYNC_NAME, "tcp")) == NULL)
service = htons(atoi(MXGLSYNC_PORT));
else
service = se->s_port;
}
#ifdef HAVE_GETADDRINFO
bzero(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if ((err = getaddrinfo(peer->p_name, "0", &hints, &res0)) != 0) {
mg_log(LOG_ERR, "cannot sync with peer %s, "
"getaddrinfo failed: %s (%d entries queued)",
peer->p_name, gai_strerror(err), peer->p_qlen);
return -1;
}
for (res = res0; res; res = res->ai_next) {
/*We only test an address family which kernel supports. */
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s == -1)
continue;
close(s);
if (local_addr(res->ai_addr, res->ai_addrlen)) {
peer->p_flags |= P_LOCAL;
freeaddrinfo(res0);
return -1;
}
}
for (res = res0; res; res = res->ai_next) {
s = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (s == -1)
continue;
switch (res->ai_family) {
case AF_INET:
SA4(res->ai_addr)->sin_port = service;
if (conf.c_syncsrcaddr != NULL) {
laddrstr = conf.c_syncsrcaddr;
} else {
laddrstr = "0.0.0.0";
}
break;
#ifdef AF_INET6
case AF_INET6:
SA6(res->ai_addr)->sin6_port = service;
laddrstr = "::";
break;
#endif
default:
mg_log(LOG_ERR, "cannot sync, unknown address family");
close(s);
s = -1;
continue;
}
laddrlen = sizeof(laddr);
if (ipfromstring(laddrstr, SA(&laddr), &laddrlen,
res->ai_family) == 1 &&
bind(s, SA(&laddr), laddrlen) == 0 &&
connect(s, res->ai_addr, res->ai_addrlen) == 0)
break;
close(s);
s = -1;
}
freeaddrinfo(res0);
if (s < 0) {
mg_log(LOG_ERR,
"cannot sync with peer %s: %s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
return -1;
}
#else
raddrlen = sizeof(raddr);
if (ipfromstring(peer->p_name, SA(&raddr), &raddrlen,
AF_UNSPEC) != 1) {
mg_log(LOG_ERR, "cannot sync, invalid address");
return -1;
}
if (local_addr(SA(&raddr), raddrlen)) {
peer->p_flags |= P_LOCAL;
return -1;
}
switch (SA(&raddr)->sa_family) {
case AF_INET:
SA4(&raddr)->sin_port = service;
if (conf.c_syncsrcaddr != NULL) {
laddrstr = conf.c_syncsrcaddr;
} else {
laddrstr = "0.0.0.0";
}
break;
#ifdef AF_INET6
case AF_INET6:
SA6(&raddr)->sin6_port = service;
laddrstr = "::";
break;
#endif
default:
mg_log(LOG_ERR, "cannot sync, unknown address family");
return -1;
}
if ((pe = getprotobyname("tcp")) == NULL)
proto = 6;
else
proto = pe->p_proto;
if ((s = socket(SA(&raddr)->sa_family, SOCK_STREAM, proto)) == -1) {
mg_log(LOG_ERR, "cannot sync with peer %s, "
"socket failed: %s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
return -1;
}
laddrlen = sizeof(laddr);
if (ipfromstring(laddrstr, SA(&laddr), &laddrlen,
SA(&raddr)->sa_family) != 1) {
mg_log(LOG_ERR, "cannot sync, invalid address");
close(s);
return -1;
}
if (bind(s, SA(&laddr), laddrlen) != 0) {
mg_log(LOG_ERR, "cannot sync with peer %s, "
"bind failed: %s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
close(s);
return -1;
}
if (connect(s, SA(&raddr), raddrlen) != 0) {
mg_log(LOG_ERR, "cannot sync with peer %s, "
"connect failed: %s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
close(s);
return -1;
}
#endif
param = O_NONBLOCK;
if (fcntl(s, F_SETFL, param) != 0) {
mg_log(LOG_ERR, "cannot set non blocking I/O with %s: %s",
peer->p_name, strerror(errno));
}
errno = 0;
if ((stream = Fdopen(s, "w+")) == NULL) {
mg_log(LOG_ERR, "cannot sync with peer %s, "
"fdopen failed: %s (%d entries queued)",
peer->p_name,
(errno == 0) ? "out of stdio streams" : strerror(errno),
peer->p_qlen);
close(s);
return -1;
}
#ifdef USE_FD_POOL
s = fileno(stream); /* the socket descriptor could have been replaced by Fdopen() ! */
#endif
if (setvbuf(stream, NULL, _IOLBF, 0) != 0)
mg_log(LOG_ERR, "cannot set line buffering with peer %s: %s",
peer->p_name, strerror(errno));
sync_waitdata(s, peer->p_socket_timeout);
if (fgets(line, LINELEN, stream) == NULL) {
mg_log(LOG_ERR, "Lost connection with peer %s: "
"%s (%d entries queued)",
peer->p_name, strerror(errno), peer->p_qlen);
goto bad;
}
/*
* On some systems, opening a stream on a socket introduce
* weird behavior: the in and out buffers get mixed up.
* By calling fflush() after each read operation, we fix that
*/
fflush(stream);
if ((replystr = strtok_r(line, sep, &cookie)) == NULL) {
mg_log(LOG_ERR, "Unexpected reply \"%s\" from peer %s "
"closing connection (%d entries queued)",
line, peer->p_name, peer->p_qlen);
goto bad;
}
replycode = atoi(replystr);
if (replycode != 200) {
mg_log(LOG_ERR, "Unexpected reply \"%s\" from peer %s "
"closing connection (%d entries queued)",
line, peer->p_name, peer->p_qlen);
goto bad;
}
if ((peer->p_vers = select_protocol(peer, s, stream)) == 0)
goto bad;
mg_log(LOG_INFO, "Connection to %s established, protocol version %d",
peer->p_name, peer->p_vers);
peer->p_stream = stream;
peer->p_socket = s;
return 0;
bad:
Fclose(stream);
peer->p_stream = NULL;
return -1;
}
void
sync_master_stop(void) {
if (sync_master4.sock != 1) {
close(sync_master4.sock);
sync_master4.sock = -1;
}
if (sync_master6.sock != 1) {
close(sync_master6.sock);
sync_master6.sock = -1;
}
}
void
sync_master_restart(void) {
pthread_t tid;
int empty;
int error;
int sync_master6_runs = SMS_NOTRUNNING;
int sync_master4_runs = SMS_NOTRUNNING;
PEER_RDLOCK;
empty = LIST_EMPTY(&peer_head);
PEER_UNLOCK;
pthread_mutex_lock(&sync_master_lock);
if (empty || (sync_master4.runs && sync_master6.runs))
goto last;
if (conf.c_syncaddr != NULL) {
if (strchr(conf.c_syncaddr, ':')) {
if (sync_master6.runs != SMS_RUNNING) {
sync_listen(conf.c_syncaddr, conf.c_syncport,
&sync_master6);
sync_master6_runs = sync_master6.runs;
}
sync_master4.runs = SMS_DISABLED;
} else {
if (sync_master4.runs != SMS_RUNNING) {
sync_listen(conf.c_syncaddr, conf.c_syncport,
&sync_master4);
sync_master4_runs = sync_master4.runs;
}
sync_master6.runs = SMS_DISABLED;
}
} else {
#ifdef AF_INET6
if (sync_master6.runs != SMS_RUNNING) {
sync_listen("::", conf.c_syncport, &sync_master6);
sync_master6_runs = sync_master6.runs;
}
#endif
if (sync_master4.runs != SMS_RUNNING) {
sync_listen("0.0.0.0", conf.c_syncport, &sync_master4);
sync_master4_runs = sync_master4.runs;
}
}
if (sync_master4.runs != SMS_RUNNING &&
sync_master6.runs != SMS_RUNNING) {
mg_log(LOG_ERR, "cannot start MX sync, socket failed: %s",
strerror(errno));
exit(EX_OSERR);
}
if (sync_master6_runs == SMS_RUNNING) {
if ((error = pthread_create(&tid, NULL, sync_master,
(void *)&sync_master6)) != SMS_NOTRUNNING) {
mg_log(LOG_ERR,
"Cannot run MX sync thread for IPv6: %s",
strerror(error));
exit(EX_OSERR);
}
if ((error = pthread_detach(tid)) != 0) {
mg_log(LOG_ERR,
"pthread_detach failed for IPv6 MX sync: %s",
strerror(error));
exit(EX_OSERR);
}
}
if (sync_master4_runs == SMS_RUNNING) {
if ((error = pthread_create(&tid, NULL, sync_master,
(void *)&sync_master4)) != 0) {
mg_log(LOG_ERR,
"Cannot run MX sync thread for IPv4: %s",
strerror(error));
exit(EX_OSERR);
}
if ((error = pthread_detach(tid)) != 0) {
mg_log(LOG_ERR,
"pthread_detach failed for IPv4 MX sync: %s",
strerror(error));
exit(EX_OSERR);
}
}
last:
pthread_mutex_unlock(&sync_master_lock);
}
void *
sync_master(arg)
void *arg;
{
struct sync_master_sock *sms = arg;
conf_retain();
for (;;) {
sockaddr_t raddr;
socklen_t raddrlen;
int fd;
FILE *stream;
pthread_t tid;
struct peer *peer;
char peerstr[IPADDRSTRLEN];
int error;
int sock;
pthread_mutex_lock(&sync_master_lock);
sock = sms->sock;
pthread_mutex_unlock(&sync_master_lock);
/* TODO: accept connections in nonblocking mode
* in order to watch conf change */
bzero((void *)&raddr, sizeof(raddr));
raddrlen = sizeof(raddr);
if ((fd = accept(sock, SA(&raddr), &raddrlen)) == -1) {
mg_log(LOG_ERR, "incoming connection "
"failed: %s", strerror(errno));
if (is_fatal(errno))
exit(EX_OSERR);
}
unmappedaddr(SA(&raddr), &raddrlen);
conf_release();
conf_retain();
iptostring(SA(&raddr), raddrlen, peerstr, sizeof(peerstr));
mg_log(LOG_INFO, "Incoming MX sync connection from %s",
peerstr);
errno = 0;
if ((stream = Fdopen(fd, "w+")) == NULL) {
mg_log(LOG_ERR,
"incoming connection from %s failed, "
"fdopen fail: %s", peerstr,
(errno == 0) ? "out of stdio streams"
: strerror(errno));
close(fd);
exit(EX_OSERR);
}
if (setvbuf(stream, NULL, _IOLBF, 0) != 0)
mg_log(LOG_ERR, "cannot set line buffering: %s",
strerror(errno));
/*
* Check that the orginator IP is one of our peers
*/
PEER_RDLOCK;
if (LIST_EMPTY(&peer_head)) {
fprintf(stream, "105 No more peers, shutting down!\n");
PEER_UNLOCK;
Fclose(stream);
pthread_mutex_lock(&sync_master_lock);
close(sms->sock);
sms->sock = -1;
sms->runs = SMS_NOTRUNNING;
pthread_mutex_unlock(&sync_master_lock);
conf_release();
return NULL;
}
LIST_FOREACH(peer, &peer_head, p_list) {
#ifdef HAVE_GETADDRINFO
struct addrinfo hints, *res0, *res;
int err;
int match = 0;
bzero(&hints, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err = getaddrinfo(peer->p_name, "0", &hints, &res0);
if (err != 0) {
mg_log(LOG_ERR, "cannot resolve %s: %s",
peer->p_name, gai_strerror(err));
continue;
}
for (res = res0; res; res = res->ai_next) {
if (ip_equal(SA(&raddr), res->ai_addr)) {
match = 1;
break;
}
}
freeaddrinfo(res0);
if (match)
break;
#else
sockaddr_t addr;
socklen_t addrlen;
addrlen = sizeof(addr);
if (ipfromstring(peer->p_name, SA(&addr), &addrlen,
AF_UNSPEC) != 1) {
mg_log(LOG_ERR, "cannot resolve %s",
peer->p_name);
continue;
}
if (ip_equal(SA(&raddr), SA(&addr)))
break;
#endif
}
PEER_UNLOCK;
if (peer == NULL) {
mg_log(LOG_INFO, "Remote host %s is not a peer MX",
peerstr);
fprintf(stream,
"106 You have no permission to talk, go away!\n");
Fclose(stream);
continue;
}
if ((error = pthread_create(&tid, NULL,
(void *(*)(void *))sync_server, (void *)stream)) != 0) {
mg_log(LOG_ERR, "incoming connection from %s failed, "
"pthread_create failed: %s",
peerstr, strerror(error));
Fclose(stream);
continue;
}
if ((error = pthread_detach(tid)) != 0) {
mg_log(LOG_ERR, "incoming connection from %s failed, "
"pthread_detach failed: %s",
peerstr, strerror(error));
exit(EX_OSERR);
}
}
/* NOTREACHED */
mg_log(LOG_ERR, "sync_master quitted unexpectedly");
return NULL;
}
/* sync_master_lock must be locked */
static void
sync_listen(addr, port, sms)
char *addr, *port;
struct sync_master_sock *sms;
{
struct protoent *pe;
struct servent *se;
int proto;
sockaddr_t laddr;
socklen_t laddrlen;
int service;
int optval;
int s;
sms->runs = SMS_RUNNING;
laddrlen = sizeof(laddr);
if (ipfromstring(addr, SA(&laddr), &laddrlen, AF_UNSPEC) != 1) {
sms->runs = SMS_DISABLED;
return;
}
if ((pe = getprotobyname("tcp")) == NULL)
proto = 6;
else
proto = pe->p_proto;
if (port != NULL)
service = htons(atoi(port));
else {
if ((se = getservbyname(MXGLSYNC_NAME, "tcp")) == NULL)
service = htons(atoi(MXGLSYNC_PORT));
else
service = se->s_port;
}
switch (SA(&laddr)->sa_family) {
case AF_INET:
SA4(&laddr)->sin_port = service;
break;
#ifdef AF_INET6
case AF_INET6:
SA6(&laddr)->sin6_port = service;
break;
#endif
default:
sms->runs = SMS_DISABLED;
return;
}
if ((s = socket(SA(&laddr)->sa_family, SOCK_STREAM, proto)) == -1) {
sms->runs = SMS_DISABLED;
return;
}
optval = 1;
if ((setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
&optval, sizeof(optval))) != 0) {
mg_log(LOG_ERR, "cannot set SO_REUSEADDR: %s",
strerror(errno));
}
optval = 1;
if ((setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
&optval, sizeof(optval))) != 0) {
mg_log(LOG_ERR, "cannot set SO_KEEPALIVE: %s",
strerror(errno));
}
#ifdef IPV6_V6ONLY
if (SA(&laddr)->sa_family == AF_INET6) {
optval = 1;
if ((setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
&optval, sizeof(optval))) != 0) {
mg_log(LOG_ERR, "cannot set IPV6_V6ONLY: %s",
strerror(errno));
}
}
#endif
if (bind(s, SA(&laddr), laddrlen) != 0) {
mg_log(LOG_ERR, "cannot start MX sync, bind failed: %s",
strerror(errno));
sms->runs = SMS_DISABLED;
close(s);
return;
}
if (listen(s, MXGLSYNC_BACKLOG) != 0) {
mg_log(LOG_ERR, "cannot start MX sync, listen failed: %s",
strerror(errno));
sms->runs = SMS_DISABLED;
close(s);
return;
}
sms->sock = s;
return;
}
void
sync_server(arg)
void *arg;
{