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source: trunk/src/sh_socket.c@ 44

Last change on this file since 44 was 40, checked in by rainer, 18 years ago
Fix for tickets #13, #14, #15, #16, #17
File size: 25.4 KB

Line
1	/* SAMHAIN file system integrity testing */
2	/* Copyright (C) 2003,2005 Rainer Wichmann */
3	/* */
4	/* This program is free software; you can redistribute it */
5	/* and/or modify */
6	/* it under the terms of the GNU General Public License as */
7	/* published by */
8	/* the Free Software Foundation; either version 2 of the License, or */
9	/* (at your option) any later version. */
10	/* */
11	/* This program is distributed in the hope that it will be useful, */
12	/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
13	/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
14	/* GNU General Public License for more details. */
15	/* */
16	/* You should have received a copy of the GNU General Public License */
17	/* along with this program; if not, write to the Free Software */
18	/* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
19
20	#include "config_xor.h"
21
22	/* define if you want debug info
23	* #define SH_DEBUG_SOCKET
24	*/
25
26	#include <stdio.h>
27	#include <stdlib.h>
28	#include <stddef.h>
29	#include <string.h>
30
31	#include "samhain.h"
32	#include "sh_socket.h"
33	#include "sh_error.h"
34	#include "sh_unix.h"
35	#include "sh_calls.h"
36
37	#undef FIL__
38	#define FIL__ _("sh_socket.c")
39
40	#if defined (SH_WITH_CLIENT)
41
42	#include <signal.h>
43
44	void sh_socket_server_cmd(const char * srvcmd)
45	{
46	SL_ENTER(_("sh_tools_server_cmd"));
47
48	if ((srvcmd == NULL) \|\| (srvcmd[0] == '\0') \|\| (sl_strlen(srvcmd) < 4))
49	{
50	SL_RET0(_("sh_socket_server_cmd"));
51	}
52	if ((srvcmd[0] == 'S') \|\| (srvcmd[1] == 'T') \|\|
53	(srvcmd[2] == 'O') \|\| (srvcmd[3] == 'P'))
54	{
55	TPT((0, FIL__, __LINE__, _("msg=<stop command from server>\n")));
56	#ifdef SIGQUIT
57	raise(SIGQUIT);
58	#else
59	TPT((0, FIL__, __LINE__, _("msg=<sigquit not defined>\n")));
60	#endif
61	}
62	else if ((srvcmd[0] == 'R') \|\| (srvcmd[1] == 'E') \|\|
63	(srvcmd[2] == 'L') \|\| (srvcmd[3] == 'O') \|\|
64	(srvcmd[4] == 'A') \|\| (srvcmd[5] == 'D'))
65	{
66	TPT((0, FIL__, __LINE__, _("msg=<reload command from server>\n")));
67	#ifdef SIGHUP
68	raise(SIGHUP);
69	#else
70	TPT((0, FIL__, __LINE__, _("msg=<sighup not defined>\n")));
71	#endif
72	}
73	else
74	{
75	sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, 0, MSG_E_SUBGEN,
76	srvcmd,
77	_("sh_socket_server_cmd"));
78	}
79	SL_RET0(_("sh_socket_server_cmd"));
80	}
81	/* #if defined (SH_WITH_CLIENT)
82	*/
83	#endif
84
85	#if defined(SH_WITH_SERVER)
86	#include <errno.h>
87
88	#include <sys/types.h>
89	#include <sys/stat.h>
90
91	#include <unistd.h>
92	#include <fcntl.h>
93
94	#include <time.h>
95
96	#include <sys/socket.h>
97	#include <sys/un.h>
98
99
100	#ifdef HAVE_SYS_UIO_H
101	#include <sys/uio.h>
102	#endif
103	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED)
104	#if defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| defined(HAVE_STRUCT_SOCKCRED)
105	#include <sys/param.h>
106	#include <sys/ucred.h>
107	#endif
108	#endif
109
110
111	int pf_unix_fd = -1;
112	static char * sh_sockname = NULL;
113	static char sh_sockpass_real[SOCKPASS_MAX+1];
114
115	struct socket_cmd {
116	char cmd[SH_MAXMSGLEN];
117	char clt[SH_MAXMSGLEN];
118	char cti[81];
119	struct socket_cmd * next;
120	};
121
122	#if !defined(O_NONBLOCK)
123	#if defined(O_NDELAY)
124	#define O_NONBLOCK O_NDELAY
125	#else
126	#define O_NONBLOCK 0
127	#endif
128	#endif
129
130	#if !defined(AF_FILE)
131	#define AF_FILE AF_UNIX
132	#endif
133
134	static struct socket_cmd * cmdlist = NULL;
135	static struct socket_cmd * runlist = NULL;
136
137	static int sh_socket_flaguse = S_FALSE;
138	static int sh_socket_flaguid = 0;
139
140	#include "sh_utils.h"
141
142
143	struct reload_cmd {
144	char clt[SH_MAXMSGLEN];
145	time_t cti;
146	struct reload_cmd * next;
147	};
148	static struct reload_cmd * reloadlist = NULL;
149
150	void sh_socket_add2reload (const char * clt)
151	{
152	struct reload_cmd * new = reloadlist;
153
154	while (new)
155	{
156	if (0 == sl_strcmp(new->clt, clt))
157	{
158	sl_strlcpy (new->clt, clt, SH_MAXMSGLEN);
159	new->cti = time(NULL);
160	return;
161	}
162	new = new->next;
163	}
164
165	new = SH_ALLOC(sizeof(struct reload_cmd));
166	sl_strlcpy (new->clt, clt, SH_MAXMSGLEN);
167	new->cti = time(NULL);
168
169	new->next = reloadlist;
170	reloadlist = new;
171
172	return;
173	}
174
175	#include "zAVLTree.h"
176	#include "sh_html.h"
177	#include "sh_tools.h"
178	static void sh_socket_add2list (struct socket_cmd * in);
179
180	static void sh_socket_probe4reload ()
181	{
182	struct reload_cmd * new;
183	struct socket_cmd cmd;
184
185	zAVLCursor avlcursor;
186	client_t * item;
187	extern zAVLTree * all_clients;
188
189	char * file;
190	unsigned long dummy;
191	struct stat buf;
192
193	for (item = (client_t *) zAVLFirst(&avlcursor, all_clients); item;
194	item = (client_t *) zAVLNext(&avlcursor))
195	{
196	if (item->status_now != CLT_INACTIVE)
197	{
198	file = get_client_conf_file (item->hostname, &dummy);
199
200	if (0 == stat (file, &buf))
201	{
202	new = reloadlist;
203	while (new)
204	{
205	if (0 == sl_strcmp(new->clt, item->hostname))
206	{
207	if (buf.st_mtime > new->cti)
208	{
209	/* reload */
210	sl_strlcpy(cmd.cmd, _("RELOAD"), SH_MAXMSGLEN);
211	sl_strlcpy(cmd.clt, item->hostname, SH_MAXMSGLEN);
212	sh_socket_add2list (&cmd);
213	}
214	break;
215	}
216	new = new->next;
217	}
218	}
219	}
220	}
221	return;
222	}
223
224	char * sh_get_sockpass ()
225	{
226	int j = 0;
227	while (skey->sh_sockpass[2*j] != '\0' && j < sizeof(sh_sockpass_real))
228	{
229	sh_sockpass_real[j] = skey->sh_sockpass[2*j];
230	++j;
231	}
232	sh_sockpass_real[j] = '\0';
233	return sh_sockpass_real;
234	}
235
236	void sh_set_sockpass ()
237	{
238	int j;
239	for (j = 0; j < 15; ++j)
240	{
241	sh_sockpass_real[j] = '\0';
242	}
243	}
244
245	int sh_socket_use (const char * c)
246	{
247	return sh_util_flagval(c, &sh_socket_flaguse);
248	}
249
250	int sh_socket_remove ()
251	{
252	int retval = 0;
253	#ifdef S_ISSOCK
254	struct stat sbuf;
255	#endif
256
257	SL_ENTER(_("sh_socket_remove"));
258
259	if (NULL == sh_sockname)
260	{
261	SL_RETURN((retval),_("sh_socket_remove"));
262	}
263
264	if (0 != tf_trust_check (DEFAULT_PIDDIR, SL_YESPRIV))
265	{
266	SL_RETURN((-1),_("sh_socket_remove"));
267	}
268
269	if ( (retry_lstat(FIL__, __LINE__, sh_sockname, &sbuf) == 0) &&
270	(sbuf.st_uid == getuid()))
271	{
272	#ifdef S_ISSOCK
273	if (S_ISSOCK (sbuf.st_mode))
274	{
275	retval = retry_aud_unlink (FIL__, __LINE__, sh_sockname);
276	}
277	#else
278	retval = retry_aud_unlink (FIL__, __LINE__, sh_sockname);
279	#endif
280	}
281	SL_RETURN((retval),_("sh_socket_remove"));
282	}
283
284	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(HAVE_STRUCT_CMSGCRED) && !defined(HAVE_STRUCT_FCRED) && !(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
285
286	#define NEED_PASSWORD_AUTH
287
288	#endif
289
290	int sh_socket_uid (const char * c)
291	{
292	uid_t val = (uid_t) strtol (c, (char **)NULL, 10);
293	sh_socket_flaguid = val;
294	#if defined(NEED_PASSWORD_AUTH)
295	sh_error_handle(SH_ERR_WARN, FIL__, __LINE__, errno, MSG_E_SUBGEN,
296	_("Config option SetSocketAllowUID not supported, use SetSocketPassword"),
297	_("sh_socket_uid"));
298	#endif
299	return 0;
300	}
301
302	int sh_socket_password (const char * c)
303	{
304	#if defined(NEED_PASSWORD_AUTH)
305	int j, i;
306
307	#define LCG(n) ((69069 * n) & 0xffffffffUL)
308
309	i = sl_strlen(c);
310	if (i > SOCKPASS_MAX) {
311	return -1;
312	}
313	for (j = 0; j < (2*SOCKPASS_MAX+1); ++j)
314	{
315	skey->sh_sockpass[j] = '\0';
316	}
317	for (j = 0; j < i; ++j)
318	{
319	skey->sh_sockpass[2*j] = c[j];
320	skey->sh_sockpass[(2*j)+1] = (LCG(c[j]) % 256);
321	}
322	return 0;
323	#else
324	sh_error_handle(SH_ERR_WARN, FIL__, __LINE__, errno, MSG_E_SUBGEN,
325	_("Config option SetSocketPassword not supported, use SetSocketAllowUID"),
326	_("sh_socket_password"));
327	(void) c;
328	return 0;
329	#endif
330	}
331
332
333	int sh_socket_open_int ()
334	{
335	struct sockaddr_un name;
336	size_t size;
337	int flags;
338	#if defined(SO_PASSCRED)
339	socklen_t optval = 1;
340	#endif
341	struct stat buf;
342
343	SL_ENTER(_("sh_socket_open_int"));
344
345	if (sh_socket_flaguse == S_FALSE)
346	{
347	SL_RETURN(0, _("sh_socket_open_int"));
348	}
349
350	if (sh_sockname == NULL)
351	{
352	size = sl_strlen(DEFAULT_PIDDIR) + 1 + sl_strlen(SH_INSTALL_NAME) + 6;
353	sh_sockname = SH_ALLOC(size); /* compile-time constant */
354	sl_strlcpy(sh_sockname, DEFAULT_PIDDIR, size);
355	sl_strlcat(sh_sockname, "/", size);
356	sl_strlcat(sh_sockname, SH_INSTALL_NAME, size);
357	sl_strlcat(sh_sockname, _(".sock"), size);
358	}
359
360	pf_unix_fd = socket (PF_UNIX, SOCK_STREAM, 0);
361	if ((pf_unix_fd) < 0)
362	{
363	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
364	sh_error_message (errno),
365	_("sh_socket_open_int: socket"));
366	SL_RETURN( (-1), _("sh_socket_open_int"));
367	}
368
369	if (sizeof(name.sun_path) < (1 + sl_strlen(sh_sockname)))
370	{
371	close(pf_unix_fd); pf_unix_fd = -1;
372	sh_error_handle ((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
373	_("PID dir path too long"),
374	_("sh_socket_open_int"));
375	SL_RETURN( (-1), _("sh_socket_open_int"));
376	}
377
378	name.sun_family = AF_FILE;
379	sl_strlcpy (name.sun_path, sh_sockname, sizeof(name.sun_path));
380
381	size = (offsetof (struct sockaddr_un, sun_path)
382	+ strlen (name.sun_path) + 1);
383
384	flags = retry_lstat (FIL__, __LINE__, sh_sockname, &buf);
385
386	if (flags == 0)
387	{
388	sh_error_handle(SH_ERR_INFO, FIL__, __LINE__, -1, MSG_E_SUBGEN,
389	_("Socket exists, trying to unlink it"),
390	_("sh_socket_open_int"));
391	if (sh_socket_remove() < 0)
392	{
393	close(pf_unix_fd); pf_unix_fd = -1;
394	sh_error_handle ((-1), FIL__, __LINE__, -1, MSG_E_SUBGEN,
395	_("Unlink of socket failed, maybe path not trusted"),
396	_("sh_socket_open_int"));
397	SL_RETURN( (-1), _("sh_socket_open_int"));
398	}
399	}
400
401	if (bind ((pf_unix_fd), (struct sockaddr *) &name, size) < 0)
402	{
403	close(pf_unix_fd); pf_unix_fd = -1;
404	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
405	sh_error_message (errno),
406	_("sh_socket_open_int: bind"));
407	SL_RETURN( (-1), _("sh_socket_open_int"));
408	}
409
410	#ifdef SO_PASSCRED
411	if (0 != setsockopt(pf_unix_fd, SOL_SOCKET, SO_PASSCRED,
412	&optval, sizeof(optval)))
413	{
414	close(pf_unix_fd); pf_unix_fd = -1;
415	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
416	sh_error_message (errno),
417	_("sh_socket_open_int: setsockopt"));
418	SL_RETURN( (-1), _("sh_socket_open_int"));
419	}
420	#endif
421
422	flags = fcntl((pf_unix_fd), F_GETFL);
423	if (flags < 0)
424	{
425	close(pf_unix_fd); pf_unix_fd = -1;
426	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
427	sh_error_message (errno),
428	_("sh_socket_open_int: fcntl1"));
429	SL_RETURN( (-1), _("sh_socket_open_int"));
430	}
431
432	flags = fcntl((pf_unix_fd), F_SETFL, flags\|O_NONBLOCK);
433	if (flags < 0)
434	{
435	close(pf_unix_fd); pf_unix_fd = -1;
436	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
437	sh_error_message (errno),
438	_("sh_socket_open_int: fcntl2"));
439	SL_RETURN( (-1), _("sh_socket_open_int"));
440	}
441
442	if (0 != listen(pf_unix_fd, 5))
443	{
444	close(pf_unix_fd); pf_unix_fd = -1;
445	sh_error_handle ((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
446	sh_error_message (errno),
447	_("sh_socket_open_int: listen"));
448	SL_RETURN( (-1), _("sh_socket_open_int"));
449	}
450	SL_RETURN( (0), _("sh_socket_open_int"));
451	}
452	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
453	/* #endif */
454
455	/*
456	#if !defined(HAVE_GETPEEREID) && !defined(SO_PEERCRED) && !defined(HAVE_STRUCT_CMSGCRED) && !defined(HAVE_STRUCT_FCRED) && !(defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
457	static
458	int sh_socket_read (struct socket_cmd * srvcmd)
459	{
460	srvcmd->cmd[0] = '\0';
461	srvcmd->clt[0] = '\0';
462	return 0;
463	}
464	#else
465	*/
466
467	/*
468	* Parts of the socket authentication code is copied from PostgreSQL:
469	*
470	* PostgreSQL Database Management System
471	* (formerly known as Postgres, then as Postgres95)
472	*
473	* Portions Copyright (c) 1996-2001, The PostgreSQL Global Development Group
474	*
475	* Portions Copyright (c) 1994, The Regents of the University of California
476	*
477	* Permission to use, copy, modify, and distribute this software and its
478	* documentation for any purpose, without fee, and without a written agreement
479	* is hereby granted, provided that the above copyright notice and this
480	* paragraph and the following two paragraphs appear in all copies.
481	*
482	* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
483	* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING
484	* LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS
485	* DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE
486	* POSSIBILITY OF SUCH DAMAGE.
487	*
488	* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
489	* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
490	* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
491	* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO
492	* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
493	*/
494	static
495	int sh_socket_read (struct socket_cmd * srvcmd)
496	{
497	struct socket_cmd * list_cmd;
498	char message[SH_MAXMSG];
499	struct sockaddr_un name;
500	int size;
501	int nbytes;
502	int talkfd;
503	int retry = 0;
504
505	char * cmd = NULL;
506	char * clt = NULL;
507
508	int client_uid = -1;
509
510
511	struct msghdr msg;
512	struct iovec iov;
513
514	#if defined(NEED_PASSWORD_AUTH)
515	char * eopw = NULL;
516	char * goodpassword = NULL;
517	#endif
518
519	#if defined(HAVE_GETPEEREID)
520	uid_t peer_uid;
521	gid_t peer_gid;
522	#elif defined(SO_PEERCRED)
523	struct ucred cr;
524	int cl = sizeof(cr);
525
526	#elif defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
527
528	#ifdef HAVE_STRUCT_CMSGCRED
529	typedef struct cmsgcred Cred;
530	#define CRED_UID cmcred_uid
531
532	#elif HAVE_STRUCT_FCRED
533	typedef struct fcred Cred;
534	#define CRED_UID fc_uid
535
536	#elif HAVE_STRUCT_SOCKCRED
537	typedef struct sockcred Cred;
538	#define CRED_UID sc_uid
539
540	#endif
541	Cred *cred;
542
543	/* Compute size without padding */
544	char cmsgmem[ALIGN(sizeof(struct cmsghdr)) + ALIGN(sizeof(Cred))];
545	/* for NetBSD */
546
547	/* Point to start of first structure */
548	struct cmsghdr cmsg = (struct cmsghdr ) cmsgmem;
549	#endif
550
551	if (pf_unix_fd < 0)
552	{
553	return 0;
554	}
555
556	iov.iov_base = (char *) &message;
557	iov.iov_len = sizeof(message);
558
559	memset (&msg, 0, sizeof (msg));
560	msg.msg_iov = &iov;
561	msg.msg_iovlen = 1;
562
563	#if !defined(SO_PEERCRED) && !defined(HAVE_GETPEEREID)
564	#if defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
565	msg.msg_control = (char *) cmsg;
566	msg.msg_controllen = sizeof (cmsgmem);
567	memset (cmsg, 0, sizeof (cmsgmem));
568	#endif
569	#endif
570
571	/* the socket is non-blocking
572	* 'name' is the address of the sender socket
573	*/
574	size = sizeof (name);
575	talkfd = retry_accept(FIL__, __LINE__,
576	pf_unix_fd, (struct sockaddr *) & name, &size);
577	if ((talkfd < 0) && (errno == EAGAIN))
578	{
579	return 0;
580	}
581	else if (talkfd < 0)
582	{
583	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
584	sh_error_message (errno),
585	_("sh_socket_read: accept"));
586	return -1;
587	}
588
589
590	#if defined(LOCAL_CREDS) && !defined(SO_PEERCRED) && !defined(HAVE_GETPEEREID)
591	/* Set the socket to receive credentials on the next message
592	*/
593	{
594	int on = 1;
595	if (setsockopt (talkfd, 0, LOCAL_CREDS, &on, sizeof (on)) < 0)
596	{
597	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
598	sh_error_message (errno),
599	_("sh_socket_read: setsockopt"));
600	close(talkfd);
601	return -1;
602	}
603	}
604	#endif
605
606	do {
607	nbytes = recvmsg (talkfd, &msg, 0);
608	if ((nbytes < 0) && (errno != EAGAIN))
609	{
610	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
611	sh_error_message (errno),
612	_("sh_socket_read: recvmsg"));
613	close(talkfd);
614	return -1;
615	}
616	else if (nbytes < 0)
617	{
618	++retry;
619	retry_msleep(0, 1);
620	}
621	} while ((nbytes < 0) && (retry < 3));
622
623	#ifdef SH_DEBUG_SOCKET
624	fprintf(stderr, "%d bytes received\n", nbytes);
625	#endif
626
627	/* msg.msg_iov.iov_base, filled by recvmsg
628	*/
629	message[sizeof(message)-1] = '\0';
630
631	if (nbytes < 0)
632	{
633	if (errno == EAGAIN)
634	{
635	/* no data */
636	close(talkfd);
637	return 0;
638	}
639	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
640	sh_error_message (errno),
641	_("sh_socket_read: recvfrom"));
642	close(talkfd);
643	return -1;
644	}
645
646	#if defined(HAVE_GETPEEREID)
647	if (0 != getpeereid(talkfd, &peer_uid, &peer_gid))
648	{
649	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
650	sh_error_message (errno),
651	_("sh_socket_read: getpeereid"));
652	close(talkfd);
653	return -1;
654	}
655	client_uid = peer_uid;
656	cmd = message;
657	#elif defined(SO_PEERCRED)
658	if (0 != getsockopt(talkfd, SOL_SOCKET, SO_PEERCRED, &cr, &cl))
659	{
660	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
661	sh_error_message (errno),
662	_("sh_socket_read: getsockopt"));
663	close(talkfd);
664	return -1;
665	}
666	client_uid = cr.uid;
667	cmd = message;
668	#elif defined(HAVE_STRUCT_CMSGCRED) \|\| defined(HAVE_STRUCT_FCRED) \|\| (defined(HAVE_STRUCT_SOCKCRED) && defined(LOCAL_CREDS))
669	if (cmsg->cmsg_len < sizeof (cmsgmem) \|\| cmsg->cmsg_type != SCM_CREDS)
670	{
671	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
672	_("Message from recvmsg() was not SCM_CREDS"),
673	_("sh_socket_read"));
674	close(talkfd);
675	return -1;
676	}
677	cred = (Cred *) CMSG_DATA (cmsg);
678	client_uid = cred->CRED_UID;
679	cmd = message;
680	#elif defined(NEED_PASSWORD_AUTH)
681	goodpassword = sh_get_sockpass();
682	eopw = strchr(message, '@');
683	if (eopw)
684	*eopw = '\0';
685	/*
686	* message is null-terminated and >> goodpassword
687	*/
688	if (0 == strcmp(goodpassword, message) &&
689	strlen(goodpassword) < (sizeof(message)/2))
690	{
691	client_uid = sh_socket_flaguid;
692	cmd = &message[strlen(goodpassword)+1];
693	sh_set_sockpass();
694	}
695	else
696	{
697	sh_error_handle((-1), FIL__, __LINE__, 0, MSG_E_SUBGEN,
698	_("Bad password"),
699	_("sh_socket_read"));
700	sh_set_sockpass();
701	close(talkfd);
702	return -1;
703	}
704	#else
705	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
706	_("Socket credentials not supported on this OS"),
707	_("sh_socket_read"));
708	close(talkfd);
709	return -1;
710	#endif
711
712	#ifdef SH_DEBUG_SOCKET
713	fprintf(stderr, "Peer uid=%d, required=%d\n",
714	client_uid, sh_socket_flaguid);
715	#endif
716
717	if (client_uid != sh_socket_flaguid)
718	{
719	sh_error_handle((-1), FIL__, __LINE__, client_uid, MSG_E_SUBGEN,
720	_("client does not have required uid"),
721	_("sh_socket_read: getsockopt"));
722	close(talkfd);
723	return -1;
724	}
725
726
727	/* Give a diagnostic message.
728	*/
729	#ifdef SH_DEBUG_SOCKET
730	fprintf (stderr, "Server: got message: %s\n", cmd);
731	#endif
732
733	clt = strchr(cmd, ':');
734	if (clt != NULL)
735	{
736	*clt = '\0'; ++clt;
737	if (sl_strlen(cmd) >= SH_MAXMSGLEN)
738	{
739	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
740	_("Bad message format: command too long"),
741	_("sh_socket_read"));
742	close(talkfd);
743	return -1;
744	}
745	else if (sl_strlen(clt) >= SH_MAXMSGLEN)
746	{
747	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
748	_("Bad message format: hostname too long"),
749	_("sh_socket_read"));
750	close(talkfd);
751	return -1;
752	}
753	if (cmd[0] == 'L' && cmd[1] == 'I' &&
754	cmd[2] == 'S' && cmd[3] == 'T')
755	{
756	goto list_all;
757	}
758	else if (cmd[0] == 'P' && cmd[1] == 'R' &&
759	cmd[2] == 'O' && cmd[3] == 'B' && cmd[4] == 'E')
760	{
761	sh_socket_probe4reload();
762	cmd[0] = 'L'; cmd[1] = 'I'; cmd[2] = 'S'; cmd[3] = 'T';cmd[4] = '\0';
763	goto list_all;
764	}
765	sl_strlcpy (srvcmd->cmd, cmd, SH_MAXMSGLEN);
766	sl_strlcpy (srvcmd->clt, clt, SH_MAXMSGLEN);
767	--clt; *clt = ':';
768	}
769	else
770	{
771	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
772	_("Bad message format"),
773	_("sh_socket_read"));
774	close(talkfd);
775	return -1;
776	}
777
778	/* Bounce the message back to the sender.
779	* 'name' is the receiver address; it has been been filled
780	* with the sender address in the recvfrom call
781	*/
782	#ifdef SH_DEBUG_SOCKET
783	fprintf (stderr, "Server: send message: %s to %s\n",
784	cmd, name.sun_path);
785	#endif
786	/*
787	nbytes = sendto (pf_unix_fd, message, nbytes, 0,
788	(struct sockaddr *) & name, size);
789	*/
790	nbytes = send (talkfd, cmd, strlen(cmd) + 1, 0);
791	close(talkfd);
792	if (nbytes < 0)
793	{
794	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
795	sh_error_message (errno),
796	_("sh_socket_read: send"));
797	return -1;
798	}
799	#ifdef SH_DEBUG_SOCKET
800	fprintf (stderr, "Server: message is out\n");
801	#endif
802	return nbytes;
803
804	list_all:
805	#ifdef SH_DEBUG_SOCKET
806	fprintf (stderr, "Server: list all\n");
807	#endif
808	if (cmd[4] == 'A' && cmd[5] == 'L' && cmd[6] == 'L')
809	{
810	list_cmd = runlist;
811	while (list_cmd)
812	{
813	sl_snprintf(message, sizeof(message), _("SENT %8s %32s %s"),
814	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
815	/*
816	sl_strlcpy(message, _("DONE"), SH_MAXMSG);
817	sl_strlcat(message, " ", SH_MAXMSG);
818	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
819	sl_strlcat(message, " ", SH_MAXMSG);
820	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
821	sl_strlcat(message, " ", SH_MAXMSG);
822	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
823	*/
824	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
825	if (nbytes < 0)
826	{
827	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
828	sh_error_message (errno),
829	_("sh_socket_read: sendto"));
830	close(talkfd);
831	return -1;
832	}
833	list_cmd = list_cmd->next;
834	}
835	}
836
837	list_cmd = cmdlist;
838	while (list_cmd)
839	{
840	sl_snprintf(message, sizeof(message), _(">>>> %8s %32s %s"),
841	list_cmd->cmd, list_cmd->clt, list_cmd->cti);
842	/*
843	sl_strlcpy(message, _(">>>>"), SH_MAXMSG);
844	sl_strlcat(message, " ", SH_MAXMSG);
845	sl_strlcat(message, list_cmd->cmd, SH_MAXMSG);
846	sl_strlcat(message, " ", SH_MAXMSG);
847	sl_strlcat(message, list_cmd->clt, SH_MAXMSG);
848	sl_strlcat(message, " ", SH_MAXMSG);
849	sl_strlcat(message, list_cmd->cti, SH_MAXMSG);
850	*/
851	/*
852	nbytes = sendto (pf_unix_fd, message, sl_strlen(message) + 1, 0,
853	(struct sockaddr *) & name, size);
854	*/
855	nbytes = send (talkfd, message, sl_strlen(message) + 1, 0);
856	if (nbytes < 0)
857	{
858	sh_error_handle((-1), FIL__, __LINE__, errno, MSG_E_SUBGEN,
859	sh_error_message (errno),
860	_("sh_socket_read: sendto"));
861	close(talkfd);
862	return -1;
863	}
864	list_cmd = list_cmd->next;
865	}
866
867	/*
868	nbytes = sendto (pf_unix_fd, _("END"), 4, 0,
869	(struct sockaddr *) & name, size);
870	*/
871	nbytes = send (talkfd, _("END"), 4, 0);
872	close(talkfd);
873	return 0;
874	}
875	/* #if !defined(HAVE_CMSGCRED) \|\| !defined(SO_PEERCRED) */
876	/* #endif */
877
878	static void sh_socket_add2list (struct socket_cmd * in)
879	{
880	struct socket_cmd * new;
881
882	new = SH_ALLOC(sizeof(struct socket_cmd));
883	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
884	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
885	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
886	new->next = cmdlist;
887	cmdlist = new;
888
889	return;
890	}
891
892	static void sh_socket_add2run (struct socket_cmd * in)
893	{
894	struct socket_cmd * new = runlist;
895	char * client_name = in->clt;
896
897	while (new)
898	{
899	if (0 == sl_strcmp(new->clt, client_name))
900	{
901	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
902	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
903	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
904	return;
905	}
906	new = new->next;
907	}
908
909	new = SH_ALLOC(sizeof(struct socket_cmd));
910	sl_strlcpy (new->cmd, in->cmd, sizeof(new->cmd));
911	sl_strlcpy (new->clt, in->clt, sizeof(new->clt));
912	sl_strlcpy (new->cti, sh_unix_time(0), sizeof(new->cti));
913	new->next = runlist;
914	runlist = new;
915
916	return;
917	}
918
919
920
921	static void sh_socket_rm2list (const char * client_name)
922	{
923	struct socket_cmd * old = cmdlist;
924	struct socket_cmd * new = cmdlist;
925
926	while (new)
927	{
928	if (0 == sl_strcmp(new->clt, client_name))
929	{
930	if ((new == cmdlist) && (new->next == NULL))
931	{
932	cmdlist = NULL;
933	SH_FREE(new);
934	return;
935	}
936	else if (new == cmdlist)
937	{
938	cmdlist = new->next;
939	SH_FREE(new);
940	return;
941	}
942	else
943	{
944	old->next = new->next;
945	SH_FREE(new);
946	return;
947	}
948	}
949	old = new;
950	new = new->next;
951	}
952	return;
953	}
954
955	/* poll the socket to gather input
956	*/
957	int sh_socket_poll()
958	{
959	struct socket_cmd cmd;
960	char cancel_cmd[SH_MAXMSGLEN];
961
962	/* struct pollfd sh_poll = { pf_unix_fd, POLLIN, 0 }; */
963
964	if (pf_unix_fd < 0)
965	{
966	return 0;
967	}
968
969	sl_strlcpy(cancel_cmd, _("CANCEL"), sizeof(cancel_cmd));
970
971	while (sh_socket_read (&cmd) > 0)
972	{
973	if (0 == sl_strcmp(cmd.cmd, cancel_cmd))
974	{
975	sh_socket_rm2list (cmd.clt);
976	}
977	else
978	{
979	sh_socket_rm2list (cmd.clt);
980	sh_socket_add2list (&cmd);
981	}
982	}
983	return 0;
984	}
985
986	/* return the command associated with client_name
987	and remove the corresponding entry
988	*/
989	char * sh_socket_check(const char * client_name)
990	{
991	struct socket_cmd * old = cmdlist;
992	struct socket_cmd * new = cmdlist;
993	static char out[SH_MAXMSGLEN];
994
995	while (new)
996	{
997	if (0 == sl_strcmp(new->clt, client_name))
998	{
999	sl_strlcpy(out, new->cmd, sizeof(out));
1000	sh_socket_add2run (new);
1001	sh_socket_rm2list (client_name);
1002	return out;
1003	}
1004	old = new;
1005	new = new->next;
1006	}
1007	return NULL;
1008	}
1009
1010	/* #if defined (SH_WITH_SERVER)
1011	*/
1012	#endif
1013

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