krb5.git - MIT Kerberos patches

path: root/src/kadmin/v4server/admin_server.c

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author	Dan Winship <danw@mit.edu>	1998-01-28 22:22:50 +0000
committer	Dan Winship <danw@mit.edu>	1998-01-28 22:22:50 +0000
commit	519b3133fd556a2952372f736c42a6e81ef7ce6b (patch)
tree	c590d6b5adda81c23361c3cc9146d4bd683f75c4 /src/kadmin/v4server/admin_server.c
parent	077f5ae764ae27d1de71c8f1c9f0fcbb33a7b3e6 (diff)

* telnetd.c (doit): additional fix for previous terminaltype change

(fixes a bug that caused TERM to be set to "") git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@10384 dc483132-0cff-0310-8789-dd5450dbe970

Diffstat (limited to 'src/kadmin/v4server/admin_server.c')

0 files changed, 0 insertions, 0 deletions

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/* tcpsrv.c
 *
 * Common code for plain TCP based servers. This is currently being
 * utilized by imtcp and imgssapi. I suspect that when we implement
 * SSL/TLS, that module could also use tcpsrv.
 *
 * There are actually two classes within the tcpserver code: one is
 * the tcpsrv itself, the other one is its sessions. This is a helper
 * class to tcpsrv.
 *
 * The common code here calls upon specific functionality by using
 * callbacks. The specialised input modules need to set the proper
 * callbacks before the code is run. The tcpsrv then calls back
 * into the specific input modules at the appropriate time.
 *
 * NOTE: read comments in module-template.h to understand how this file
 *       works!
 *
 * File begun on 2007-12-21 by RGerhards (extracted from syslogd.c)
 *
 * Copyright 2007, 2008 Rainer Gerhards and Adiscon GmbH.
 *
 * This file is part of rsyslog.
 *
 * Rsyslog 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 3 of the License, or
 * (at your option) any later version.
 *
 * Rsyslog 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with Rsyslog.  If not, see <http://www.gnu.org/licenses/>.
 *
 * A copy of the GPL can be found in the file "COPYING" in this distribution.
 */

#include "config.h"
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdarg.h>
#include <ctype.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include "rsyslog.h"
#include "syslogd.h"
#include "cfsysline.h"
#include "module-template.h"
#include "net.h"
#include "srUtils.h"
#include "conf.h"
#include "tcpsrv.h"
#include "obj.h"
#include "errmsg.h"

MODULE_TYPE_LIB

/* defines */
#define TCPSESS_MAX_DEFAULT 200 /* default for nbr of tcp sessions if no number is given */

/* static data */
DEFobjStaticHelpers
DEFobjCurrIf(conf)
DEFobjCurrIf(tcps_sess)
DEFobjCurrIf(errmsg)
DEFobjCurrIf(net)



/* code to free all sockets within a socket table.
 * A socket table is a descriptor table where the zero
 * element has the count of elements. This is used for
 * listening sockets. The socket table itself is also
 * freed.
 * A POINTER to this structure must be provided, thus
 * double indirection!
 * rgerhards, 2007-06-28
 */
static void freeAllSockets(int **socks)
{
	assert(socks != NULL);
	assert(*socks != NULL);
	while(**socks) {
		dbgprintf("Closing socket %d.\n", (*socks)[**socks]);
		close((*socks)[**socks]);
		(**socks)--;
	}
	free(*socks);
	*socks = NULL;
}


/* configure TCP listener settings. This is called during command
 * line parsing. The argument following -t is supplied as an argument.
 * The format of this argument is
 * "<port-to-use>, <nbr-of-sessions>"
 * Typically, there is no whitespace between port and session number.
 * (but it may be...).
 * NOTE: you can not use dbgprintf() in here - the dbgprintf() system is
 * not yet initilized when this function is called.
 * rgerhards, 2007-06-21
 * The port in cOptarg is handed over to us - the caller MUST NOT free it!
 * rgerhards, 2008-03-20
 */
static void
configureTCPListen(tcpsrv_t *pThis, char *cOptarg)
{
	register int i;
	register char *pArg = cOptarg;

	assert(cOptarg != NULL);
	ISOBJ_TYPE_assert(pThis, tcpsrv);

	/* extract port */
	i = 0;
	while(isdigit((int) *pArg)) {
		i = i * 10 + *pArg++ - '0';
	}

	if(pThis->TCPLstnPort != NULL) {
		free(pThis->TCPLstnPort);
		pThis->TCPLstnPort = NULL;
	}
		
	if( i >= 0 && i <= 65535) {
		pThis->TCPLstnPort = cOptarg;
	} else {
		errmsg.LogError(NO_ERRCODE, "Invalid TCP listen port %s - changed to 514.\n", cOptarg);
	}
}


#if 0 // I think this is no longer needed
static void
configureTCPListenSessMax(char *cOptarg)
{
	register int i;
	register char *pArg = cOptarg;

	assert(cOptarg != NULL);

	/* number of sessions */
	i = 0;
	while(isdigit((int) *pArg)) {
		i = i * 10 + *pArg++ - '0';
	}

	if(i > 0)
		pThis->iSessMax = i;
	else {
		/* too small, need to adjust */
		errmsg.LogError(NO_ERRCODE, "TCP session max configured to %s - changing to 1.\n", cOptarg);
		pThis->iSessMax = 1;
	}
}
#endif


/* Initialize the session table
 * returns 0 if OK, somewhat else otherwise
 */
static rsRetVal
TCPSessTblInit(tcpsrv_t *pThis)
{
	DEFiRet;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	assert(pThis->pSessions == NULL);

	dbgprintf("Allocating buffer for %d TCP sessions.\n", pThis->iSessMax);
	if((pThis->pSessions = (tcps_sess_t **) calloc(pThis->iSessMax, sizeof(tcps_sess_t *))) == NULL) {
		dbgprintf("Error: TCPSessInit() could not alloc memory for TCP session table.\n");
		ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
	}

finalize_it:
	RETiRet;
}


/* find a free spot in the session table. If the table
 * is full, -1 is returned, else the index of the free
 * entry (0 or higher).
 */
static int
TCPSessTblFindFreeSpot(tcpsrv_t *pThis)
{
	register int i;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	for(i = 0 ; i < pThis->iSessMax ; ++i) {
		if(pThis->pSessions[i] == NULL)
			break;
	}

	return((i < pThis->iSessMax) ? i : -1);
}


/* Get the next session index. Free session tables entries are
 * skipped. This function is provided the index of the last
 * session entry, or -1 if no previous entry was obtained. It
 * returns the index of the next session or -1, if there is no
 * further entry in the table. Please note that the initial call
 * might as well return -1, if there is no session at all in the
 * session table.
 */
static int
TCPSessGetNxtSess(tcpsrv_t *pThis, int iCurr)
{
	register int i;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	for(i = iCurr + 1 ; i < pThis->iSessMax ; ++i)
		if(pThis->pSessions[i] != NULL)
			break;

	return((i < pThis->iSessMax) ? i : -1);
}


/* De-Initialize TCP listner sockets.
 * This function deinitializes everything, including freeing the
 * session table. No TCP listen receive operations are permitted
 * unless the subsystem is reinitialized.
 * rgerhards, 2007-06-21
 */
static void deinit_tcp_listener(tcpsrv_t *pThis)
{
	int iTCPSess;

	ISOBJ_TYPE_assert(pThis, tcpsrv);
	assert(pThis->pSessions != NULL);

	/* close all TCP connections! */
	iTCPSess = TCPSessGetNxtSess(pThis, -1);
	while(iTCPSess != -1) {
		tcps_sess.Destruct(&pThis->pSessions[iTCPSess]);
		/* now get next... */
		iTCPSess = TCPSessGetNxtSess(pThis, iTCPSess);
	}
	
	/* we are done with the session table - so get rid of it...
	*/
	free(pThis->pSessions);
	pThis->pSessions = NULL; /* just to make sure... */

	if(pThis->TCPLstnPort != NULL)
		free(pThis->TCPLstnPort);

	/* finally close the listen sockets themselfs */
	freeAllSockets(&pThis->pSocksLstn);
}


/* Initialize TCP sockets (for listener)
 * This function returns either NULL (which means it failed) or 
 * a pointer to an array of file descriptiors. If the pointer is
 * returned, the zeroest element [0] contains the count of valid
 * descriptors. The descriptors themself follow in range
 * [1] ... [num-descriptors]. It is guaranteed that each of these
 * descriptors is valid, at least when this function returns.
 * Please note that technically the array may be larger than the number
 * of valid pointers stored in it. The memory overhead is minimal, so
 * we do not bother to re-allocate an array of the exact size. Logically,
 * the array still contains the exactly correct number of descriptors.
 */
static int *create_tcp_socket(tcpsrv_t *pThis)
{
        struct addrinfo hints, *res, *r;
        int error, maxs, *s, *socks, on = 1;
	char *TCPLstnPort;

	ISOBJ_TYPE_assert(pThis, tcpsrv);

	if(!strcmp(pThis->TCPLstnPort, "0"))
		TCPLstnPort = "514";
		/* use default - we can not do service db update, because there is
		 * no IANA-assignment for syslog/tcp. In the long term, we might
		 * re-use RFC 3195 port of 601, but that would probably break to
		 * many existing configurations.
		 * rgerhards, 2007-06-28
		 */
	else
		TCPLstnPort = pThis->TCPLstnPort;
	dbgprintf("creating tcp socket on port %s\n", TCPLstnPort);
        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
        hints.ai_family = family;
        hints.ai_socktype = SOCK_STREAM;


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