1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user or with the express written consent of
8 * Sun Microsystems, Inc.
9 *
10 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
11 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
12 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
13 *
14 * Sun RPC is provided with no support and without any obligation on the
15 * part of Sun Microsystems, Inc. to assist in its use, correction,
16 * modification or enhancement.
17 *
18 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
19 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
20 * OR ANY PART THEREOF.
21 *
22 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
23 * or profits or other special, indirect and consequential damages, even if
24 * Sun has been advised of the possibility of such damages.
25 *
26 * Sun Microsystems, Inc.
27 * 2550 Garcia Avenue
28 * Mountain View, California  94043
29 */
30
31#ifndef lint
32#if 0
33static	char sccsid[] = "@(#)update.c 1.2 91/03/11 Copyr 1986 Sun Micro";
34#endif
35#endif
36
37/*
38 * Copyright (C) 1986, 1989, Sun Microsystems, Inc.
39 */
40
41/*
42 * Administrative tool to add a new user to the publickey database
43 */
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <sys/types.h>
48#include <sys/time.h>
49#include <sys/resource.h>
50
51#include <rpc/rpc.h>
52#include <rpc/key_prot.h>
53
54#ifdef YP
55#include <sys/wait.h>
56#include <rpcsvc/yp_prot.h>
57#include <rpcsvc/ypclnt.h>
58#include <netdb.h>
59#endif	/* YP */
60
61#include <pwd.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <unistd.h>
66
67#include "extern.h"
68
69#ifdef YP
70static char SHELL[] = "/bin/sh";
71static char YPDBPATH[]="/var/yp";	/* This is defined but not used! */
72static char UPDATEFILE[] = "updaters";
73
74static int _openchild(char *, FILE **, FILE **);
75static char *basename(char *path);
76
77/*
78 * Determine if requester is allowed to update the given map,
79 * and update it if so. Returns the yp status, which is zero
80 * if there is no access violation.
81 */
82int
83mapupdate(char *requester, char *mapname, u_int op, u_int keylen,
84    char *key, u_int datalen, char *data)
85{
86	char updater[MAXMAPNAMELEN + 40];
87	FILE *childargs;
88	FILE *childrslt;
89#ifdef WEXITSTATUS
90	int status;
91#else
92	union wait status;
93#endif
94	pid_t pid;
95	u_int yperrno;
96
97
98#ifdef DEBUG
99	printf("%s %s\n", key, data);
100#endif
101	(void)sprintf(updater, "make -s -f %s/%s %s", YPDBPATH, /* !!! */
102					UPDATEFILE, mapname);
103	pid = _openchild(updater, &childargs, &childrslt);
104	if (pid < 0) {
105		return (YPERR_YPERR);
106	}
107
108	/*
109	 * Write to child
110	 */
111	(void)fprintf(childargs, "%s\n", requester);
112	(void)fprintf(childargs, "%u\n", op);
113	(void)fprintf(childargs, "%u\n", keylen);
114	(void)fwrite(key, (int)keylen, 1, childargs);
115	(void)fprintf(childargs, "\n");
116	(void)fprintf(childargs, "%u\n", datalen);
117	(void)fwrite(data, (int)datalen, 1, childargs);
118	(void)fprintf(childargs, "\n");
119	(void)fclose(childargs);
120
121	/*
122	 * Read from child
123	 */
124	(void)fscanf(childrslt, "%d", &yperrno);
125	(void)fclose(childrslt);
126
127	(void)wait(&status);
128#ifdef WEXITSTATUS
129	if (WEXITSTATUS(status) != 0) {
130#else
131	if (status.w_retcode != 0) {
132#endif
133		return (YPERR_YPERR);
134	}
135	return (yperrno);
136}
137
138/*
139 * returns pid, or -1 for failure
140 */
141static pid_t
142_openchild(char *command, FILE **fto, FILE **ffrom)
143{
144	int i;
145	pid_t pid;
146	int pdto[2];
147	int pdfrom[2];
148	char *com;
149	struct rlimit rl;
150
151	if (pipe(pdto) < 0) {
152		goto error1;
153	}
154	if (pipe(pdfrom) < 0) {
155		goto error2;
156	}
157	switch (pid = fork()) {
158	case -1:
159		goto error3;
160
161	case 0:
162		/*
163		 * child: read from pdto[0], write into pdfrom[1]
164		 */
165		(void)close(0);
166		(void)dup(pdto[0]);
167		(void)close(1);
168		(void)dup(pdfrom[1]);
169		getrlimit(RLIMIT_NOFILE, &rl);
170		for (i = rl.rlim_max - 1; i >= 3; i--) {
171			(void) close(i);
172		}
173		com = malloc((unsigned) strlen(command) + 6);
174		if (com == NULL) {
175			_exit(~0);
176		}
177		(void)sprintf(com, "exec %s", command);
178		execl(SHELL, basename(SHELL), "-c", com, (char *)NULL);
179		_exit(~0);
180
181	default:
182		/*
183		 * parent: write into pdto[1], read from pdfrom[0]
184		 */
185		*fto = fdopen(pdto[1], "w");
186		(void)close(pdto[0]);
187		*ffrom = fdopen(pdfrom[0], "r");
188		(void)close(pdfrom[1]);
189		break;
190	}
191	return (pid);
192
193	/*
194	 * error cleanup and return
195	 */
196error3:
197	(void)close(pdfrom[0]);
198	(void)close(pdfrom[1]);
199error2:
200	(void)close(pdto[0]);
201	(void)close(pdto[1]);
202error1:
203	return (-1);
204}
205
206static char *
207basename(char *path)
208{
209	char *p;
210
211	p = strrchr(path, '/');
212	if (p == NULL) {
213		return (path);
214	} else {
215		return (p + 1);
216	}
217}
218
219#else /* YP */
220
221#define	ERR_ACCESS	1
222#define	ERR_MALLOC	2
223#define	ERR_READ	3
224#define	ERR_WRITE	4
225#define	ERR_DBASE	5
226#define	ERR_KEY		6
227
228static int match(char *, char *);
229
230/*
231 * Determine if requester is allowed to update the given map,
232 * and update it if so. Returns the status, which is zero
233 * if there is no access violation. This function updates
234 * the local file and then shuts up.
235 */
236int
237localupdate(char *name, char *filename, u_int op, u_int keylen __unused,
238    char *key, u_int datalen __unused, char *data)
239{
240	char line[256];
241	FILE *rf;
242	FILE *wf;
243	char *tmpname;
244	int err;
245
246	/*
247	 * Check permission
248	 */
249	if (strcmp(name, key) != 0) {
250		return (ERR_ACCESS);
251	}
252	if (strcmp(name, "nobody") == 0) {
253		/*
254		 * Can't change "nobody"s key.
255		 */
256		return (ERR_ACCESS);
257	}
258
259	/*
260	 * Open files
261	 */
262	tmpname = malloc(strlen(filename) + 4);
263	if (tmpname == NULL) {
264		return (ERR_MALLOC);
265	}
266	sprintf(tmpname, "%s.tmp", filename);
267	rf = fopen(filename, "r");
268	if (rf == NULL) {
269		return (ERR_READ);
270	}
271	wf = fopen(tmpname, "w");
272	if (wf == NULL) {
273		return (ERR_WRITE);
274	}
275	err = -1;
276	while (fgets(line, sizeof (line), rf)) {
277		if (err < 0 && match(line, name)) {
278			switch (op) {
279			case YPOP_INSERT:
280				err = ERR_KEY;
281				break;
282			case YPOP_STORE:
283			case YPOP_CHANGE:
284				fprintf(wf, "%s %s\n", key, data);
285				err = 0;
286				break;
287			case YPOP_DELETE:
288				/* do nothing */
289				err = 0;
290				break;
291			}
292		} else {
293			fputs(line, wf);
294		}
295	}
296	if (err < 0) {
297		switch (op) {
298		case YPOP_CHANGE:
299		case YPOP_DELETE:
300			err = ERR_KEY;
301			break;
302		case YPOP_INSERT:
303		case YPOP_STORE:
304			err = 0;
305			fprintf(wf, "%s %s\n", key, data);
306			break;
307		}
308	}
309	fclose(wf);
310	fclose(rf);
311	if (err == 0) {
312		if (rename(tmpname, filename) < 0) {
313			return (ERR_DBASE);
314		}
315	} else {
316		if (unlink(tmpname) < 0) {
317			return (ERR_DBASE);
318		}
319	}
320	return (err);
321}
322
323static int
324match(char *line, char *name)
325{
326	int len;
327
328	len = strlen(name);
329	return (strncmp(line, name, len) == 0 &&
330		(line[len] == ' ' || line[len] == '\t'));
331}
332#endif /* !YP */
333