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      1  1.14     lukem /*	$NetBSD: process.c,v 1.14 2009/03/16 01:13:38 lukem Exp $	*/
      2   1.3  christos 
      3   1.1       cgd /*
      4   1.3  christos  * Copyright (c) 1983, 1993
      5   1.3  christos  *	The Regents of the University of California.  All rights reserved.
      6   1.1       cgd  *
      7   1.1       cgd  * Redistribution and use in source and binary forms, with or without
      8   1.1       cgd  * modification, are permitted provided that the following conditions
      9   1.1       cgd  * are met:
     10   1.1       cgd  * 1. Redistributions of source code must retain the above copyright
     11   1.1       cgd  *    notice, this list of conditions and the following disclaimer.
     12   1.1       cgd  * 2. Redistributions in binary form must reproduce the above copyright
     13   1.1       cgd  *    notice, this list of conditions and the following disclaimer in the
     14   1.1       cgd  *    documentation and/or other materials provided with the distribution.
     15  1.10       agc  * 3. Neither the name of the University nor the names of its contributors
     16   1.1       cgd  *    may be used to endorse or promote products derived from this software
     17   1.1       cgd  *    without specific prior written permission.
     18   1.1       cgd  *
     19   1.1       cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20   1.1       cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21   1.1       cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22   1.1       cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23   1.1       cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24   1.1       cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25   1.1       cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26   1.1       cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27   1.1       cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28   1.1       cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29   1.1       cgd  * SUCH DAMAGE.
     30   1.1       cgd  */
     31   1.1       cgd 
     32   1.3  christos #include <sys/cdefs.h>
     33   1.1       cgd #ifndef lint
     34   1.3  christos #if 0
     35   1.3  christos static char sccsid[] = "@(#)process.c	8.2 (Berkeley) 11/16/93";
     36   1.3  christos #else
     37  1.14     lukem __RCSID("$NetBSD: process.c,v 1.14 2009/03/16 01:13:38 lukem Exp $");
     38   1.3  christos #endif
     39   1.1       cgd #endif /* not lint */
     40   1.1       cgd 
     41   1.1       cgd /*
     42   1.1       cgd  * process.c handles the requests, which can be of three types:
     43   1.1       cgd  *	ANNOUNCE - announce to a user that a talk is wanted
     44   1.1       cgd  *	LEAVE_INVITE - insert the request into the table
     45   1.1       cgd  *	LOOK_UP - look up to see if a request is waiting in
     46   1.1       cgd  *		  in the table for the local user
     47   1.1       cgd  *	DELETE - delete invitation
     48   1.1       cgd  */
     49   1.5       mrg 
     50   1.1       cgd #include <sys/param.h>
     51   1.1       cgd #include <sys/stat.h>
     52   1.1       cgd #include <sys/socket.h>
     53   1.5       mrg 
     54   1.1       cgd #include <netinet/in.h>
     55   1.5       mrg 
     56   1.1       cgd #include <protocols/talkd.h>
     57   1.5       mrg 
     58   1.1       cgd #include <netdb.h>
     59   1.1       cgd #include <syslog.h>
     60   1.1       cgd #include <stdio.h>
     61   1.1       cgd #include <string.h>
     62   1.1       cgd #include <paths.h>
     63   1.5       mrg 
     64   1.4  christos #include "extern.h"
     65   1.1       cgd 
     66   1.7  christos #include "utmpentry.h"
     67   1.7  christos 
     68   1.4  christos void
     69  1.13     lukem process_request(CTL_MSG *mp, CTL_RESPONSE *rp)
     70   1.1       cgd {
     71   1.4  christos 	CTL_MSG *ptr;
     72   1.1       cgd 
     73   1.1       cgd 	rp->vers = TALK_VERSION;
     74   1.1       cgd 	rp->type = mp->type;
     75   1.1       cgd 	rp->id_num = htonl(0);
     76   1.8    itojun 	mp->id_num = ntohl(mp->id_num);
     77   1.8    itojun 	mp->addr.sa_family = ntohs(mp->addr.sa_family);
     78   1.8    itojun 	mp->ctl_addr.sa_family = ntohs(mp->ctl_addr.sa_family);
     79   1.8    itojun 	mp->pid = ntohl(mp->pid);
     80   1.1       cgd 	if (mp->vers != TALK_VERSION) {
     81   1.1       cgd 		syslog(LOG_WARNING, "Bad protocol version %d", mp->vers);
     82   1.1       cgd 		rp->answer = BADVERSION;
     83   1.1       cgd 		return;
     84   1.1       cgd 	}
     85   1.1       cgd 	if (mp->addr.sa_family != AF_INET) {
     86   1.1       cgd 		syslog(LOG_WARNING, "Bad address, family %d",
     87   1.1       cgd 		    mp->addr.sa_family);
     88   1.1       cgd 		rp->answer = BADADDR;
     89   1.1       cgd 		return;
     90   1.1       cgd 	}
     91   1.1       cgd 	if (mp->ctl_addr.sa_family != AF_INET) {
     92   1.1       cgd 		syslog(LOG_WARNING, "Bad control address, family %d",
     93   1.1       cgd 		    mp->ctl_addr.sa_family);
     94   1.1       cgd 		rp->answer = BADCTLADDR;
     95   1.1       cgd 		return;
     96   1.1       cgd 	}
     97   1.6       mrg 	if (debug || logging)
     98   1.6       mrg 		print_request("request", mp);
     99   1.1       cgd 	switch (mp->type) {
    100   1.1       cgd 
    101   1.1       cgd 	case ANNOUNCE:
    102   1.1       cgd 		do_announce(mp, rp);
    103   1.1       cgd 		break;
    104   1.1       cgd 
    105   1.1       cgd 	case LEAVE_INVITE:
    106   1.1       cgd 		ptr = find_request(mp);
    107   1.1       cgd 		if (ptr != (CTL_MSG *)0) {
    108   1.1       cgd 			rp->id_num = htonl(ptr->id_num);
    109   1.1       cgd 			rp->answer = SUCCESS;
    110   1.1       cgd 		} else
    111   1.1       cgd 			insert_table(mp, rp);
    112   1.1       cgd 		break;
    113   1.1       cgd 
    114   1.1       cgd 	case LOOK_UP:
    115   1.1       cgd 		ptr = find_match(mp);
    116   1.1       cgd 		if (ptr != (CTL_MSG *)0) {
    117   1.1       cgd 			rp->id_num = htonl(ptr->id_num);
    118   1.1       cgd 			rp->addr = ptr->addr;
    119   1.1       cgd 			rp->addr.sa_family = htons(ptr->addr.sa_family);
    120   1.1       cgd 			rp->answer = SUCCESS;
    121   1.1       cgd 		} else
    122   1.1       cgd 			rp->answer = NOT_HERE;
    123   1.1       cgd 		break;
    124   1.1       cgd 
    125   1.1       cgd 	case DELETE:
    126   1.1       cgd 		rp->answer = delete_invite(mp->id_num);
    127   1.1       cgd 		break;
    128   1.1       cgd 
    129   1.1       cgd 	default:
    130   1.1       cgd 		rp->answer = UNKNOWN_REQUEST;
    131   1.1       cgd 		break;
    132   1.1       cgd 	}
    133   1.1       cgd 	if (debug)
    134   1.6       mrg 		print_response("process_request done", rp);
    135   1.1       cgd }
    136   1.1       cgd 
    137   1.4  christos void
    138  1.13     lukem do_announce(CTL_MSG *mp, CTL_RESPONSE *rp)
    139   1.1       cgd {
    140   1.1       cgd 	CTL_MSG *ptr;
    141   1.1       cgd 	int result;
    142  1.12  christos 	char hostname[NI_MAXHOST];
    143  1.12  christos 	struct sockaddr sa;
    144  1.12  christos 
    145  1.12  christos 	tsa2sa(&sa, &mp->ctl_addr);
    146   1.1       cgd 
    147   1.1       cgd 	/* see if the user is logged */
    148   1.8    itojun 	result = find_user(mp->r_name, mp->r_tty, sizeof(mp->r_tty));
    149   1.1       cgd 	if (result != SUCCESS) {
    150   1.1       cgd 		rp->answer = result;
    151   1.1       cgd 		return;
    152   1.1       cgd 	}
    153  1.12  christos 	if (getnameinfo(&sa, sa.sa_len, hostname, sizeof(hostname), NULL,
    154  1.12  christos 	    0, 0)) {
    155   1.1       cgd 		rp->answer = MACHINE_UNKNOWN;
    156   1.1       cgd 		return;
    157   1.1       cgd 	}
    158   1.1       cgd 	ptr = find_request(mp);
    159   1.1       cgd 	if (ptr == (CTL_MSG *) 0) {
    160   1.1       cgd 		insert_table(mp, rp);
    161  1.12  christos 		rp->answer = announce(mp, hostname);
    162   1.1       cgd 		return;
    163   1.1       cgd 	}
    164   1.1       cgd 	if (mp->id_num > ptr->id_num) {
    165   1.1       cgd 		/*
    166   1.1       cgd 		 * This is an explicit re-announce, so update the id_num
    167   1.1       cgd 		 * field to avoid duplicates and re-announce the talk.
    168   1.1       cgd 		 */
    169   1.1       cgd 		ptr->id_num = new_id();
    170   1.1       cgd 		rp->id_num = htonl(ptr->id_num);
    171  1.12  christos 		rp->answer = announce(mp, hostname);
    172   1.1       cgd 	} else {
    173   1.1       cgd 		/* a duplicated request, so ignore it */
    174   1.1       cgd 		rp->id_num = htonl(ptr->id_num);
    175   1.1       cgd 		rp->answer = SUCCESS;
    176   1.1       cgd 	}
    177   1.1       cgd }
    178   1.1       cgd 
    179   1.1       cgd /*
    180   1.1       cgd  * Search utmp for the local user
    181   1.1       cgd  */
    182   1.4  christos int
    183  1.14     lukem find_user(const char *name, char *tty, size_t ttysize)
    184   1.1       cgd {
    185   1.1       cgd 	int status;
    186   1.1       cgd 	struct stat statb;
    187   1.7  christos 	struct utmpentry *ep;
    188   1.7  christos 	char ftty[sizeof(_PATH_DEV) + sizeof(ep->line)];
    189   1.4  christos 	time_t atime = 0;
    190   1.4  christos 	int anytty = 0;
    191   1.1       cgd 
    192   1.7  christos 	(void)getutentries(NULL, &ep);
    193   1.7  christos 
    194   1.1       cgd 	status = NOT_HERE;
    195   1.8    itojun 	(void) strlcpy(ftty, _PATH_DEV, sizeof(ftty));
    196   1.4  christos 
    197   1.4  christos 	if (*tty == '\0')
    198   1.4  christos 		anytty = 1;
    199   1.4  christos 
    200   1.7  christos 	for (; ep; ep = ep->next) {
    201   1.7  christos 		if (strcmp(ep->name, name) != 0)
    202   1.4  christos 			continue;
    203   1.4  christos 		if (anytty) {
    204   1.4  christos 			/* no particular tty was requested */
    205  1.11  christos 			(void)strlcpy(ftty + sizeof(_PATH_DEV) - 1, ep->line,
    206  1.11  christos 			     sizeof(ftty) - sizeof(_PATH_DEV) + 1);
    207   1.8    itojun 			if (stat(ftty, &statb) != 0)
    208   1.8    itojun 				continue;
    209   1.8    itojun 
    210   1.8    itojun 			if (!(statb.st_mode & S_IWGRP)) {
    211   1.8    itojun 				if (status != SUCCESS)
    212   1.8    itojun 					status = PERMISSION_DENIED;
    213   1.8    itojun 				continue;
    214   1.8    itojun 			}
    215   1.8    itojun 			if (statb.st_atime > atime &&
    216   1.8    itojun 			    strlcpy(tty, ep->line, ttysize) < ttysize) {
    217   1.8    itojun 				atime = statb.st_atime;
    218   1.8    itojun 				status = SUCCESS;
    219   1.1       cgd 			}
    220   1.7  christos 		} else if (strcmp(ep->line, tty) == 0) {
    221   1.4  christos 			status = SUCCESS;
    222   1.4  christos 			break;
    223   1.1       cgd 		}
    224   1.4  christos 	}
    225   1.1       cgd 	return (status);
    226   1.1       cgd }
    227