static void multi_server_execute(int unused_event, char *context)
{
VSTREAM *stream = (VSTREAM *) context;
HTABLE *attr = (vstream_flags(stream) == multi_server_saved_flags ?
(HTABLE *) vstream_context(stream) : 0);
if (multi_server_lock != 0
&& myflock(vstream_fileno(multi_server_lock), INTERNAL_LOCK,
MYFLOCK_OP_NONE) < 0)
msg_fatal("select unlock: %m");
/*
* Do not bother the application when the client disconnected. Don't drop
* the already accepted client request after "postfix reload"; that would
* be rude.
*/
if (peekfd(vstream_fileno(stream)) > 0) {
if (master_notify(var_pid, multi_server_generation, MASTER_STAT_TAKEN) < 0)
/* void */ ;
multi_server_service(stream, multi_server_name, multi_server_argv);
if (master_notify(var_pid, multi_server_generation, MASTER_STAT_AVAIL) < 0)
multi_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT);
} else {
multi_server_disconnect(stream);
}
if (attr)
htable_free(attr, myfree);
}
DELIVER_REQUEST *deliver_request_read(VSTREAM *stream)
{
DELIVER_REQUEST *request;
/*
* Tell the queue manager that we are ready for this request.
*/
if (deliver_request_initial(stream) != 0)
return (0);
/*
* Be prepared for the queue manager to change its mind after contacting
* us. This can happen when a transport or host goes bad.
*/
(void) read_wait(vstream_fileno(stream), -1);
if (peekfd(vstream_fileno(stream)) <= 0)
return (0);
/*
* Allocate and read the queue manager's delivery request.
*/
#define XXX_DEFER_STATUS -1
request = deliver_request_alloc();
if (deliver_request_get(stream, request) < 0) {
deliver_request_done(stream, request, XXX_DEFER_STATUS);
request = 0;
}
return (request);
}
int fifo_listen(const char *path, int permissions, int block_mode)
{
char buf[BUF_LEN];
static int open_mode = 0;
char *myname = "fifo_listen";
struct stat st;
int fd;
int count;
/*
* Create a named pipe (fifo). Do whatever we can so we don't run into
* trouble when this process is restarted after crash. Make sure that we
* open a fifo and not something else, then change permissions to what we
* wanted them to be, because mkfifo() is subject to umask settings.
* Instead we could zero the umask temporarily before creating the FIFO,
* but that would cost even more system calls. Figure out if the fifo
* needs to be opened O_RDWR or O_RDONLY. Some systems need one, some
* need the other. If we choose the wrong mode, the fifo will stay
* readable, causing the program to go into a loop.
*/
if (unlink(path) && errno != ENOENT)
msg_fatal("%s: remove %s: %m", myname, path);
if (mkfifo(path, permissions) < 0)
msg_fatal("%s: create fifo %s: %m", myname, path);
switch (open_mode) {
case 0:
if ((fd = open(path, O_RDWR | O_NONBLOCK, 0)) < 0)
msg_fatal("%s: open %s: %m", myname, path);
if (readable(fd) == 0) {
open_mode = O_RDWR | O_NONBLOCK;
break;
} else {
open_mode = O_RDONLY | O_NONBLOCK;
if (msg_verbose)
msg_info("open O_RDWR makes fifo readable - trying O_RDONLY");
(void) close(fd);
/* FALLTRHOUGH */
}
default:
if ((fd = open(path, open_mode, 0)) < 0)
msg_fatal("%s: open %s: %m", myname, path);
break;
}
/*
* Make sure we opened a FIFO and skip any cruft that might have
* accumulated before we opened it.
*/
if (fstat(fd, &st) < 0)
msg_fatal("%s: fstat %s: %m", myname, path);
if (S_ISFIFO(st.st_mode) == 0)
msg_fatal("%s: not a fifo: %s", myname, path);
if (fchmod(fd, permissions) < 0)
msg_fatal("%s: fchmod %s: %m", myname, path);
non_blocking(fd, block_mode);
while ((count = peekfd(fd)) > 0
&& read(fd, buf, BUF_LEN < count ? BUF_LEN : count) > 0)
/* void */ ;
return (fd);
}
int mail_flow_count(void)
{
char *myname = "mail_flow_count";
int count;
if ((count = peekfd(MASTER_FLOW_READ)) < 0)
msg_warn("%s: %m", myname);
return (count);
}
static int qmgr_deliver_initial_reply(VSTREAM *stream)
{
int stat;
if (peekfd(vstream_fileno(stream)) < 0) {
msg_warn("%s: premature disconnect", VSTREAM_PATH(stream));
return (DELIVER_STAT_CRASH);
} else if (attr_scan(stream, ATTR_FLAG_STRICT,
ATTR_TYPE_INT, MAIL_ATTR_STATUS, &stat,
ATTR_TYPE_END) != 1) {
msg_warn("%s: malformed response", VSTREAM_PATH(stream));
return (DELIVER_STAT_CRASH);
} else {
return (stat ? DELIVER_STAT_DEFER : 0);
}
}
static int flush_request_receive(VSTREAM *client_stream, VSTRING *request)
{
int count;
/*
* Kluge: choose the protocol depending on the request size.
*/
if (read_wait(vstream_fileno(client_stream), var_ipc_timeout) < 0) {
msg_warn("timeout while waiting for data from %s",
VSTREAM_PATH(client_stream));
return (-1);
}
if ((count = peekfd(vstream_fileno(client_stream))) < 0) {
msg_warn("cannot examine read buffer of %s: %m",
VSTREAM_PATH(client_stream));
return (-1);
}
/*
* Short request: master trigger. Use the string+null protocol.
*/
if (count <= 2) {
if (vstring_get_null(request, client_stream) == VSTREAM_EOF) {
msg_warn("end-of-input while reading request from %s: %m",
VSTREAM_PATH(client_stream));
return (-1);
}
}
/*
* Long request: real flush client. Use the attribute list protocol.
*/
else {
if (attr_scan(client_stream,
ATTR_FLAG_MORE | ATTR_FLAG_STRICT,
RECV_ATTR_STR(MAIL_ATTR_REQ, request),
ATTR_TYPE_END) != 1) {
return (-1);
}
}
return (0);
}
int arpCheck()
{
arpMessage ArpMsgSend,ArpMsgRecv;
#ifdef OLD_LINUX_VERSION
struct sockaddr addr;
int j;
#endif
int i=0;
memset(&ArpMsgSend,0,sizeof(arpMessage));
memcpy(ArpMsgSend.ethhdr.ether_dhost,MAC_BCAST_ADDR,ETH_ALEN);
memcpy(ArpMsgSend.ethhdr.ether_shost,ClientHwAddr,ETH_ALEN);
ArpMsgSend.ethhdr.ether_type = htons(ETHERTYPE_ARP);
ArpMsgSend.htype = htons(ARPHRD_ETHER);
ArpMsgSend.ptype = htons(ETHERTYPE_IP);
ArpMsgSend.hlen = ETH_ALEN;
ArpMsgSend.plen = 4;
ArpMsgSend.operation = htons(ARPOP_REQUEST);
memcpy(ArpMsgSend.sHaddr,ClientHwAddr,ETH_ALEN);
memcpy(&ArpMsgSend.tInaddr,&DhcpIface.ciaddr,4);
DebugSyslog(LOG_DEBUG,
"broadcasting ARPOP_REQUEST for %u.%u.%u.%u\n",
ArpMsgSend.tInaddr[0],ArpMsgSend.tInaddr[1],
ArpMsgSend.tInaddr[2],ArpMsgSend.tInaddr[3]);
do
{
do
{
if ( i++ > 4 ) return 0; /* 5 probes */
#ifdef OLD_LINUX_VERSION
memset(&addr,0,sizeof(struct sockaddr));
memcpy(addr.sa_data,IfName,IfName_len);
if ( sendto(dhcpSocket,&ArpMsgSend,sizeof(arpMessage),0,
&addr,sizeof(struct sockaddr)) == -1 )
#else
if ( send(dhcpSocket,&ArpMsgSend,sizeof(arpMessage),0) == -1 )
#endif
{
syslog(LOG_ERR,"arpCheck: sendto: %m\n");
return -1;
}
}
while ( peekfd(dhcpSocket,50000) ); /* 50 msec timeout */
do
{
if ( recv(dhcpSocket,&ArpMsgRecv,sizeof(arpMessage),0) == -1 )
{
syslog(LOG_ERR,"arpCheck: recv: %m\n");
return -1;
}
if ( ArpMsgRecv.ethhdr.ether_type != htons(ETHERTYPE_ARP) )
continue;
if ( ArpMsgRecv.operation == htons(ARPOP_REPLY) )
{
DebugSyslog(LOG_DEBUG,
"ARPOP_REPLY received from %u.%u.%u.%u for %u.%u.%u.%u\n",
ArpMsgRecv.sInaddr[0],ArpMsgRecv.sInaddr[1],
ArpMsgRecv.sInaddr[2],ArpMsgRecv.sInaddr[3],
ArpMsgRecv.tInaddr[0],ArpMsgRecv.tInaddr[1],
ArpMsgRecv.tInaddr[2],ArpMsgRecv.tInaddr[3]);
}
else
continue;
if ( memcmp(ArpMsgRecv.tHaddr,ClientHwAddr,ETH_ALEN) )
{
DebugSyslog(LOG_DEBUG,
"target hardware address mismatch: %02X.%02X.%02X.%02X.%02X.%02X received, %02X.%02X.%02X.%02X.%02X.%02X expected\n",
ArpMsgRecv.tHaddr[0],ArpMsgRecv.tHaddr[1],ArpMsgRecv.tHaddr[2],
ArpMsgRecv.tHaddr[3],ArpMsgRecv.tHaddr[4],ArpMsgRecv.tHaddr[5],
ClientHwAddr[0],ClientHwAddr[1],
ClientHwAddr[2],ClientHwAddr[3],
ClientHwAddr[4],ClientHwAddr[5]);
continue;
}
if ( memcmp(&ArpMsgRecv.sInaddr,&DhcpIface.ciaddr,4) )
{
DebugSyslog(LOG_DEBUG,
"sender IP address mismatch: %u.%u.%u.%u received, %u.%u.%u.%u expected\n",
ArpMsgRecv.sInaddr[0],ArpMsgRecv.sInaddr[1],ArpMsgRecv.sInaddr[2],ArpMsgRecv.sInaddr[3],
((unsigned char *)&DhcpIface.ciaddr)[0],
((unsigned char *)&DhcpIface.ciaddr)[1],
((unsigned char *)&DhcpIface.ciaddr)[2],
((unsigned char *)&DhcpIface.ciaddr)[3]);
continue;
}
return 1;
}
while ( peekfd(dhcpSocket,50000) == 0 );
}
while ( 1 );
return 0;
}
int arpCheck()
{
arpMessage ArpMsgSend,ArpMsgRecv;
struct sockaddr addr;
int j,i=0,len=0;
memset(&ArpMsgSend,0,sizeof(arpMessage));
memcpy(ArpMsgSend.ethhdr.ether_dhost,MAC_BCAST_ADDR,ETH_ALEN);
memcpy(ArpMsgSend.ethhdr.ether_shost,ClientHwAddr,ETH_ALEN);
ArpMsgSend.ethhdr.ether_type = htons(ETHERTYPE_ARP);
ArpMsgSend.htype = (TokenRingIf) ? htons(ARPHRD_IEEE802_TR) : htons(ARPHRD_ETHER);
ArpMsgSend.ptype = htons(ETHERTYPE_IP);
ArpMsgSend.hlen = ETH_ALEN;
ArpMsgSend.plen = 4;
ArpMsgSend.operation = htons(ARPOP_REQUEST);
memcpy(ArpMsgSend.sHaddr,ClientHwAddr,ETH_ALEN);
memcpy(&ArpMsgSend.tInaddr,&DhcpIface.ciaddr,4);
if ( DebugFlag ) syslog(LOG_DEBUG,
"broadcasting ARPOP_REQUEST for %u.%u.%u.%u\n",
ArpMsgSend.tInaddr[0],ArpMsgSend.tInaddr[1],
ArpMsgSend.tInaddr[2],ArpMsgSend.tInaddr[3]);
do
{
do
{
if ( i++ > 4 ) return 0; /* 5 probes */
memset(&addr,0,sizeof(struct sockaddr));
memcpy(addr.sa_data,IfName,IfName_len);
if ( TokenRingIf )
len = eth2tr(&ArpMsgSend.ethhdr,BasicArpLen(ArpMsgSend));
else
len = sizeof(arpMessage);
if ( sendto(dhcpSocket,&ArpMsgSend,len,0,
&addr,sizeof(struct sockaddr)) == -1 )
{
syslog(LOG_ERR,"arpCheck: sendto: %m\n");
return -1;
}
}
while ( peekfd(dhcpSocket,50000) ); /* 50 msec timeout */
do
{
memset(&ArpMsgRecv,0,sizeof(arpMessage));
j=sizeof(struct sockaddr);
if ( recvfrom(dhcpSocket,&ArpMsgRecv,sizeof(arpMessage),0,
(struct sockaddr *)&addr,&j) == -1 )
{
syslog(LOG_ERR,"arpCheck: recvfrom: %m\n");
return -1;
}
if ( TokenRingIf )
{
if ( tr2eth(&ArpMsgRecv.ethhdr) ) continue;
}
if ( ArpMsgRecv.ethhdr.ether_type != htons(ETHERTYPE_ARP) )
continue;
if ( ArpMsgRecv.operation == htons(ARPOP_REPLY) )
{
if ( DebugFlag ) syslog(LOG_DEBUG,
"ARPOP_REPLY received from %u.%u.%u.%u for %u.%u.%u.%u\n",
ArpMsgRecv.sInaddr[0],ArpMsgRecv.sInaddr[1],
ArpMsgRecv.sInaddr[2],ArpMsgRecv.sInaddr[3],
ArpMsgRecv.tInaddr[0],ArpMsgRecv.tInaddr[1],
ArpMsgRecv.tInaddr[2],ArpMsgRecv.tInaddr[3]);
}
else
continue;
if ( memcmp(ArpMsgRecv.tHaddr,ClientHwAddr,ETH_ALEN) )
{
if ( DebugFlag )
syslog(LOG_DEBUG,
"target hardware address mismatch: %02X.%02X.%02X.%02X.%02X.%02X received, %02X.%02X.%02X.%02X.%02X.%02X expected\n",
ArpMsgRecv.tHaddr[0],ArpMsgRecv.tHaddr[1],ArpMsgRecv.tHaddr[2],
ArpMsgRecv.tHaddr[3],ArpMsgRecv.tHaddr[4],ArpMsgRecv.tHaddr[5],
ClientHwAddr[0],ClientHwAddr[1],
ClientHwAddr[2],ClientHwAddr[3],
ClientHwAddr[4],ClientHwAddr[5]);
continue;
}
if ( memcmp(&ArpMsgRecv.sInaddr,&DhcpIface.ciaddr,4) )
{
if ( DebugFlag )
syslog(LOG_DEBUG,
"sender IP address mismatch: %u.%u.%u.%u received, %u.%u.%u.%u expected\n",
ArpMsgRecv.sInaddr[0],ArpMsgRecv.sInaddr[1],ArpMsgRecv.sInaddr[2],ArpMsgRecv.sInaddr[3],
((unsigned char *)&DhcpIface.ciaddr)[0],
((unsigned char *)&DhcpIface.ciaddr)[1],
((unsigned char *)&DhcpIface.ciaddr)[2],
((unsigned char *)&DhcpIface.ciaddr)[3]);
continue;
}
return 1;
}
while ( peekfd(dhcpSocket,50000) == 0 );
}
while ( 1 );
return 0;
}
