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/*
* Copyright (c) 2012-2013 Red Hat.
* Copyright (c) 1995-2002 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 "pmproxy.h"
#define MIN_CLIENTS_ALLOC 8
ClientInfo *client;
int nClients; /* Number in array, (not all in use) */
int maxReqPortFd; /* highest request port fd */
int maxSockFd; /* largest fd for a client */
__pmFdSet sockFds; /* for client select() */
static int
NewClient(void)
{
int i;
static int clientSize;
for (i = 0; i < nClients; i++)
if (!client[i].status.connected)
break;
if (i == clientSize) {
int j, sz;
clientSize = clientSize ? clientSize * 2 : MIN_CLIENTS_ALLOC;
sz = sizeof(ClientInfo) * clientSize;
client = (ClientInfo *) realloc(client, sz);
if (client == NULL) {
__pmNoMem("NewClient", sz, PM_RECOV_ERR);
Shutdown();
exit(1);
}
for (j = i; j < clientSize; j++) {
client[j].addr = NULL;
}
}
client[i].addr = __pmSockAddrAlloc();
if (client[i].addr == NULL) {
__pmNoMem("NewClient", __pmSockAddrSize(), PM_RECOV_ERR);
Shutdown();
exit(1);
}
if (i >= nClients)
nClients = i + 1;
return i;
}
/* MY_BUFLEN needs to big enough to hold "hostname port" */
#define MY_BUFLEN (MAXHOSTNAMELEN+10)
#define MY_VERSION "pmproxy-server 1\n"
/* Establish a new socket connection to a client */
ClientInfo *
AcceptNewClient(int reqfd)
{
int i;
int fd;
__pmSockLen addrlen;
int ok = 0;
char buf[MY_BUFLEN];
char *bp;
char *endp;
char *abufp;
i = NewClient();
addrlen = __pmSockAddrSize();
fd = __pmAccept(reqfd, client[i].addr, &addrlen);
if (fd == -1) {
__pmNotifyErr(LOG_ERR, "AcceptNewClient(%d) __pmAccept failed: %s",
reqfd, netstrerror());
Shutdown();
exit(1);
}
__pmSetSocketIPC(fd);
if (fd > maxSockFd)
maxSockFd = fd;
__pmFD_SET(fd, &sockFds);
client[i].fd = fd;
client[i].pmcd_fd = -1;
client[i].status.connected = 1;
client[i].pmcd_hostname = NULL;
/*
* version negotiation (converse to negotiate_proxy() logic in
* libpcp
*
* __pmRecv client version message
* __pmSend my server version message
* __pmRecv pmcd hostname and pmcd port
*/
for (bp = buf; bp < &buf[MY_BUFLEN]; bp++) {
if (__pmRecv(fd, bp, 1, 0) != 1) {
*bp = '\0'; /* null terminate what we have */
bp = &buf[MY_BUFLEN]; /* flag error */
break;
}
/* end of line means no more ... */
if (*bp == '\n' || *bp == '\r') {
*bp = '\0';
break;
}
}
if (bp < &buf[MY_BUFLEN]) {
/* looks OK so far ... is this a version we can support? */
if (strcmp(buf, "pmproxy-client 1") == 0) {
client[i].version = 1;
ok = 1;
}
}
if (!ok) {
abufp = __pmSockAddrToString(client[i].addr);
__pmNotifyErr(LOG_WARNING, "Bad version string from client at %s", abufp);
free(abufp);
fprintf(stderr, "AcceptNewClient: bad version string was \"");
for (bp = buf; *bp && bp < &buf[MY_BUFLEN]; bp++)
fputc(*bp & 0xff, stderr);
fprintf(stderr, "\"\n");
DeleteClient(&client[i]);
return NULL;
}
if (__pmSend(fd, MY_VERSION, strlen(MY_VERSION), 0) != strlen(MY_VERSION)) {
abufp = __pmSockAddrToString(client[i].addr);
__pmNotifyErr(LOG_WARNING, "AcceptNewClient: failed to send version "
"string (%s) to client at %s\n", MY_VERSION, abufp);
free(abufp);
DeleteClient(&client[i]);
return NULL;
}
for (bp = buf; bp < &buf[MY_BUFLEN]; bp++) {
if (__pmRecv(fd, bp, 1, 0) != 1) {
*bp = '\0'; /* null terminate what we have */
bp = &buf[MY_BUFLEN]; /* flag error */
break;
}
/* end of line means no more ... */
if (*bp == '\n' || *bp == '\r') {
*bp = '\0';
break;
}
}
if (bp < &buf[MY_BUFLEN]) {
/* looks OK so far ... get hostname and port */
for (bp = buf; *bp && *bp != ' '; bp++)
;
if (bp != buf) {
*bp = '\0';
client[i].pmcd_hostname = strdup(buf);
if (client[i].pmcd_hostname == NULL)
__pmNoMem("PMCD.hostname", strlen(buf), PM_FATAL_ERR);
bp++;
client[i].pmcd_port = (int)strtoul(bp, &endp, 10);
if (*endp != '\0') {
abufp = __pmSockAddrToString(client[i].addr);
__pmNotifyErr(LOG_WARNING, "AcceptNewClient: bad pmcd port "
"\"%s\" from client at %s", bp, abufp);
free(abufp);
DeleteClient(&client[i]);
return NULL;
}
}
/* error, fall through */
}
if (client[i].pmcd_hostname == NULL) {
abufp = __pmSockAddrToString(client[i].addr);
__pmNotifyErr(LOG_WARNING, "AcceptNewClient: failed to get PMCD "
"hostname (%s) from client at %s", buf, abufp);
free(abufp);
DeleteClient(&client[i]);
return NULL;
}
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_CONTEXT) {
/*
* note error message gets appended to once pmcd connection is
* made in ClientLoop()
*/
abufp = __pmSockAddrToString(client[i].addr);
fprintf(stderr, "AcceptNewClient [%d] fd=%d from %s to %s (port %s)",
i, fd, abufp, client[i].pmcd_hostname, bp);
free(abufp);
}
#endif
return &client[i];
}
void
DeleteClient(ClientInfo *cp)
{
int i;
for (i = 0; i < nClients; i++)
if (cp == &client[i])
break;
if (i == nClients) {
fprintf(stderr, "DeleteClient: Botch: tried to delete non-existent client @" PRINTF_P_PFX "%p\n", cp);
return;
}
#ifdef PCP_DEBUG
if (pmDebug & DBG_TRACE_CONTEXT)
fprintf(stderr, "DeleteClient [%d]\n", i);
#endif
if (cp->fd >= 0) {
__pmFD_CLR(cp->fd, &sockFds);
__pmCloseSocket(cp->fd);
}
if (cp->pmcd_fd >= 0) {
__pmFD_CLR(cp->pmcd_fd, &sockFds);
__pmCloseSocket(cp->pmcd_fd);
}
if (i == nClients-1) {
i--;
while (i >= 0 && !client[i].status.connected)
i--;
nClients = (i >= 0) ? i + 1 : 0;
}
if (cp->fd == maxSockFd || cp->pmcd_fd == maxSockFd) {
maxSockFd = maxReqPortFd;
for (i = 0; i < nClients; i++) {
if (cp->status.connected == 0)
continue;
if (client[i].fd > maxSockFd)
maxSockFd = client[i].fd;
if (client[i].pmcd_fd > maxSockFd)
maxSockFd = client[i].pmcd_fd;
}
}
__pmSockAddrFree(cp->addr);
cp->addr = NULL;
cp->status.connected = 0;
cp->fd = -1;
cp->pmcd_fd = -1;
if (cp->pmcd_hostname != NULL) {
free(cp->pmcd_hostname);
cp->pmcd_hostname = NULL;
}
}
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