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/*
* Copyright (c) 2012-2013 Red Hat. All Rights Reserved.
* Copyright (c) 1997-2001 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include "trace.h"
#include "trace_dev.h"
#include "domain.h"
#include "client.h"
#include "comms.h"
extern struct timeval interval;
extern int readData(int, int *);
extern void timerUpdate(void);
extern int maxfd;
extern int nclients;
extern client_t *clients;
extern int ctlport; /* control port number */
static int ctlfd; /* fd for control port */
static int pmcdfd; /* fd for pmcd */
void alarming(int, void *);
static void hangup(int);
static int getcport(void);
/* currently in-use fd mask */
fd_set fds;
/* the AF event number */
int afid = -1;
void
traceMain(pmdaInterface *dispatch)
{
client_t *cp;
fd_set readyfds;
int nready, i, pdutype, sts, protocol;
ctlfd = getcport();
pmcdfd = __pmdaInFd(dispatch);
maxfd = (ctlfd > pmcdfd) ? (ctlfd):(pmcdfd);
FD_ZERO(&fds);
FD_SET(ctlfd, &fds);
FD_SET(pmcdfd, &fds);
signal(SIGHUP, hangup);
/* arm interval timer */
if ((afid = __pmAFregister(&interval, NULL, alarming)) < 0) {
__pmNotifyErr(LOG_ERR, "error registering asynchronous event handler");
exit(1);
}
for (;;) {
memcpy(&readyfds, &fds, sizeof(readyfds));
nready = select(maxfd+1, &readyfds, NULL, NULL, NULL);
if (nready == 0)
continue;
else if (nready < 0) {
if (neterror() != EINTR) {
__pmNotifyErr(LOG_ERR, "select failure: %s", netstrerror());
exit(1);
}
continue;
}
__pmAFblock();
if (FD_ISSET(pmcdfd, &readyfds)) {
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_APPL0)
__pmNotifyErr(LOG_DEBUG, "processing pmcd request [fd=%d]", pmcdfd);
#endif
if (__pmdaMainPDU(dispatch) < 0) {
__pmAFunblock();
exit(1); /* fatal if we lose pmcd */
}
}
/* handle request on control port */
if (FD_ISSET(ctlfd, &readyfds)) {
if ((cp = acceptClient(ctlfd)) != NULL) {
sts = __pmAccAddClient(cp->addr, &cp->denyOps);
if (sts == PM_ERR_PERMISSION)
sts = PMTRACE_ERR_PERMISSION;
else if (sts == PM_ERR_CONNLIMIT)
sts = PMTRACE_ERR_CONNLIMIT;
else if (sts >= 0)
sts = TRACE_PDU_VERSION;
__pmtracesendack(cp->fd, sts);
if (sts < 0) {
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_APPL0) {
char *hostAddr = __pmSockAddrToString(cp->addr);
__pmNotifyErr(LOG_DEBUG, "client %s [fd=%d]: connect refused, denyOps=0x%x: %s",
hostAddr, cp->fd, cp->denyOps, pmtraceerrstr(sts));
free(hostAddr);
}
#endif
deleteClient(cp);
}
else {
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_APPL0) {
char *hostAddr = __pmSockAddrToString(cp->addr);
__pmNotifyErr(LOG_DEBUG, "client %s [fd=%d]: new connection, denyOps=0x%x",
hostAddr, cp->fd, cp->denyOps);
free(hostAddr);
}
#endif
;
}
}
}
for (i = 0; i < nclients; i++) {
if (!clients[i].status.connected)
continue;
if (clients[i].denyOps & TR_OP_SEND) {
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_APPL0) {
char *hostAddr = __pmSockAddrToString(clients[i].addr);
__pmNotifyErr(LOG_DEBUG, "client %s [fd=%d]: send denied, denyOps=0x%x",
hostAddr, clients[i].fd, clients[i].denyOps);
free(hostAddr);
}
#endif
__pmtracesendack(clients[i].fd, PMTRACE_ERR_PERMISSION);
__pmAccDelClient(clients[i].addr);
deleteClient(&clients[i]);
}
else if (FD_ISSET(clients[i].fd, &readyfds)) {
protocol = 1; /* default to synchronous */
do {
if ((pdutype = readData(clients[i].fd, &protocol)) < 0) {
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_APPL0) {
char *hostAddr = __pmSockAddrToString(clients[i].addr);
__pmNotifyErr(LOG_DEBUG, "client %s [fd=%d]: close connection",
hostAddr, clients[i].fd);
free(hostAddr);
}
#endif
__pmAccDelClient(clients[i].addr);
deleteClient(&clients[i]);
}
else {
clients[i].status.protocol = protocol;
if (clients[i].status.connected) {
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_APPL0) {
char *hostAddr = __pmSockAddrToString(clients[i].addr);
__pmNotifyErr(LOG_DEBUG, "client %s [fd=%d]: %s ACK (type=%d)",
hostAddr, clients[i].fd,
protocol ? "sending" : "no", pdutype);
free(hostAddr);
}
#endif
if (protocol == 1) {
sts = __pmtracesendack(clients[i].fd, pdutype);
if (sts < 0) {
char *hostAddr = __pmSockAddrToString(clients[i].addr);
__pmNotifyErr(LOG_ERR, "client %s [fd=%d]: ACK send failed (type=%d): %s",
hostAddr, clients[i].fd,
pdutype, pmtraceerrstr(sts));
free(hostAddr);
}
}
}
}
} while (__pmtracemoreinput(clients[i].fd));
}
}
__pmAFunblock();
}
}
void
alarming(int sig, void *ptr)
{
timerUpdate();
}
static void
hangup(int sig)
{
showClients();
signal(SIGHUP, hangup);
}
/*
* Create socket for incoming connections and bind to it an address for
* clients to use. Only returns if it succeeds (exits on failure).
*/
static int
getcport(void)
{
int fd;
int i=1, one=1, sts;
struct sockaddr_in myAddr;
struct linger noLinger = {1, 0};
fd = socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
__pmNotifyErr(LOG_ERR, "getcport: socket: %s", netstrerror());
exit(1);
}
/* avoid 200 ms delay */
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (char *) &i,
(__pmSockLen)sizeof(i)) < 0) {
__pmNotifyErr(LOG_ERR, "getcport: setsockopt(nodelay): %s",
netstrerror());
exit(1);
}
/* don't linger on close */
if (setsockopt(fd, SOL_SOCKET, SO_LINGER, (char *) &noLinger,
(__pmSockLen)sizeof(noLinger)) < 0) {
__pmNotifyErr(LOG_ERR, "getcport: setsockopt(nolinger): %s",
netstrerror());
exit(1);
}
#ifndef IS_MINGW
/* ignore dead client connections */
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *) &one,
(__pmSockLen)sizeof(one)) < 0) {
__pmNotifyErr(LOG_ERR, "getcport: setsockopt(reuseaddr): %s",
netstrerror());
exit(1);
}
#else
/* see MSDN tech note: "Using SO_REUSEADDR and SO_EXCLUSIVEADDRUSE" */
if (setsockopt(sfd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE, (char *) &one,
(__pmSockLen)sizeof(one)) < 0) {
__pmNotifyErr(LOG_ERR, "getcport: setsockopt(excladdruse): %s",
netstrerror());
exit(1);
}
#endif
if (ctlport == -1) {
/*
* check for port info in the environment
*/
char *env_str;
if ((env_str = getenv(TRACE_ENV_PORT)) != NULL) {
char *end_ptr;
ctlport = (int)strtol(env_str, &end_ptr, 0);
if (*end_ptr != '\0' || ctlport < 0) {
__pmNotifyErr(LOG_WARNING, "env port is bogus (%s)", env_str);
ctlport = TRACE_PORT;
}
}
else
ctlport = TRACE_PORT;
}
/* TODO: IPv6 */
memset(&myAddr, 0, sizeof(myAddr));
myAddr.sin_family = AF_INET;
myAddr.sin_addr.s_addr = htonl(INADDR_ANY);
myAddr.sin_port = htons(ctlport);
sts = bind(fd, (const struct sockaddr *)&myAddr, sizeof(myAddr));
if (sts < 0) {
__pmNotifyErr(LOG_ERR, "bind(%d): %s", ctlport, netstrerror());
exit(1);
}
sts = listen(fd, 5); /* Max. of 5 pending connection requests */
if (sts == -1) {
__pmNotifyErr(LOG_ERR, "listen: %s", netstrerror());
exit(1);
}
return fd;
}
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