1 /* $OpenBSD: util.c,v 1.37 2022/12/26 19:16:01 jmc Exp $ */
2
3 /*
4 * Copyright (c) 1989 The Regents of the University of California.
5 * All rights reserved.
6 * Portions Copyright (c) 1983, 1995, 1996 Eric P. Allman (woof!)
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/types.h>
37 #include <sys/uio.h>
38 #include <sys/stat.h>
39 #include <err.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <ctype.h>
43 #include <string.h>
44 #include <paths.h>
45 #include <errno.h>
46 #include <fcntl.h>
47 #include <unistd.h>
48 #include <vis.h>
49 #include "finger.h"
50 #include "extern.h"
51
52 char *estrdup(char *);
53 WHERE *walloc(PERSON *pn);
54 void find_idle_and_ttywrite(WHERE *);
55 void userinfo(PERSON *, struct passwd *);
56
57 void
find_idle_and_ttywrite(WHERE * w)58 find_idle_and_ttywrite(WHERE *w)
59 {
60 struct stat sb;
61
62 (void)snprintf(tbuf, sizeof(tbuf), "%s%s", _PATH_DEV, w->tty);
63 if (stat(tbuf, &sb) == -1) {
64 /* Don't bitch about it, just handle it... */
65 w->idletime = 0;
66 w->writable = 0;
67
68 return;
69 }
70 w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;
71
72 #define TALKABLE 0220 /* tty is writable if 220 mode */
73 w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
74 }
75
76 char *
estrdup(char * s)77 estrdup(char *s)
78 {
79 char *p = strdup(s);
80 if (!p)
81 err(1, "strdup");
82 return (p);
83 }
84
85 void
userinfo(PERSON * pn,struct passwd * pw)86 userinfo(PERSON *pn, struct passwd *pw)
87 {
88 char *p;
89 char *bp, name[1024];
90 struct stat sb;
91 int len;
92
93 pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
94 pn->mailrecv = -1; /* -1 == not_valid */
95
96 pn->uid = pw->pw_uid;
97 pn->name = estrdup(pw->pw_name);
98 pn->dir = estrdup(pw->pw_dir);
99 pn->shell = estrdup(pw->pw_shell);
100
101 (void)strlcpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
102
103 /* ampersands get replaced by the login name */
104 if (!(p = strsep(&bp, ",")))
105 return;
106 expandusername(p, pw->pw_name, name, sizeof(name));
107 if (stravis(&pn->realname, name, VIS_SAFE|VIS_NOSLASH) == -1)
108 err(1, "stravis");
109 if ((p = strsep(&bp, ",")) && *p) {
110 if (stravis(&pn->office, p, VIS_SAFE|VIS_NOSLASH) == -1)
111 err(1, "stravis");
112 }
113 if ((p = strsep(&bp, ",")) && *p) {
114 if (stravis(&pn->officephone, p, VIS_SAFE|VIS_NOSLASH) == -1)
115 err(1, "stravis");
116 }
117 if ((p = strsep(&bp, ",")) && *p) {
118 if (stravis(&pn->homephone, p, VIS_SAFE|VIS_NOSLASH) == -1)
119 err(1, "stravis");
120 }
121 len = snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILSPOOL,
122 pw->pw_name);
123 if (len >= 0 && len < sizeof(tbuf)) {
124 if (stat(tbuf, &sb) < 0) {
125 if (errno != ENOENT) {
126 warn("%s", tbuf);
127 return;
128 }
129 } else if (sb.st_size != 0) {
130 pn->mailrecv = sb.st_mtime;
131 pn->mailread = sb.st_atime;
132 }
133 }
134 }
135
136 int
match(struct passwd * pw,char * user)137 match(struct passwd *pw, char *user)
138 {
139 char *p, *t;
140 char name[1024];
141
142 (void)strlcpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
143
144 /* ampersands get replaced by the login name */
145 if (!(p = strtok(p, ",")))
146 return (0);
147 expandusername(p, pw->pw_name, name, sizeof(name));
148 for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
149 if (!strcasecmp(p, user))
150 return (1);
151 return (0);
152 }
153
154 /* inspired by usr.sbin/sendmail/util.c::buildfname */
155 void
expandusername(char * gecos,char * login,char * buf,size_t buflen)156 expandusername(char *gecos, char *login, char *buf, size_t buflen)
157 {
158 char *p, *bp;
159
160 /* why do we skip asterisks!?!? */
161 if (*gecos == '*')
162 gecos++;
163 bp = buf;
164
165 /* copy gecos, interpolating & to be full name */
166 for (p = gecos; *p != '\0'; p++) {
167 if (bp >= &buf[buflen - 1]) {
168 /* buffer overflow - just use login name */
169 strlcpy(buf, login, buflen);
170 buf[buflen - 1] = '\0';
171 return;
172 }
173 if (*p == '&') {
174 /* interpolate full name */
175 strlcpy(bp, login, buflen - (bp - buf));
176 *bp = toupper((unsigned char)*bp);
177 bp += strlen(bp);
178 }
179 else
180 *bp++ = *p;
181 }
182 *bp = '\0';
183 }
184
185 void
enter_lastlog(PERSON * pn)186 enter_lastlog(PERSON *pn)
187 {
188 WHERE *w;
189 static int opened, fd;
190 struct lastlog ll;
191 char doit = 0;
192
193 /* some systems may not maintain lastlog, don't report errors. */
194 if (!opened) {
195 fd = open(_PATH_LASTLOG, O_RDONLY);
196 opened = 1;
197 }
198 if (fd == -1 ||
199 pread(fd, &ll, sizeof(ll), (off_t)pn->uid * sizeof(ll)) !=
200 sizeof(ll)) {
201 /* as if never logged in */
202 ll.ll_line[0] = ll.ll_host[0] = '\0';
203 ll.ll_time = 0;
204 }
205 if ((w = pn->whead) == NULL)
206 doit = 1;
207 else if (ll.ll_time != 0) {
208 /* if last login is earlier than some current login */
209 for (; !doit && w != NULL; w = w->next)
210 if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
211 doit = 1;
212 /*
213 * and if it's not any of the current logins
214 * can't use time comparison because there may be a small
215 * discrepancy since login calls time() twice
216 */
217 for (w = pn->whead; doit && w != NULL; w = w->next)
218 if (w->info == LOGGEDIN &&
219 strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
220 doit = 0;
221 }
222 if (doit) {
223 w = walloc(pn);
224 w->info = LASTLOG;
225 bcopy(ll.ll_line, w->tty, UT_LINESIZE);
226 w->tty[UT_LINESIZE] = 0;
227 bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
228 w->host[UT_HOSTSIZE] = 0;
229 w->loginat = ll.ll_time;
230 }
231 }
232
233 void
enter_where(struct utmp * ut,PERSON * pn)234 enter_where(struct utmp *ut, PERSON *pn)
235 {
236 WHERE *w = walloc(pn);
237
238 w->info = LOGGEDIN;
239 bcopy(ut->ut_line, w->tty, UT_LINESIZE);
240 w->tty[UT_LINESIZE] = 0;
241 bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
242 w->host[UT_HOSTSIZE] = 0;
243 w->loginat = (time_t)ut->ut_time;
244 find_idle_and_ttywrite(w);
245 }
246
247 PERSON *
enter_person(struct passwd * pw)248 enter_person(struct passwd *pw)
249 {
250 PERSON *pn, **pp;
251
252 for (pp = htab + hash(pw->pw_name);
253 *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0;
254 pp = &(*pp)->hlink)
255 ;
256 if ((pn = *pp) == NULL) {
257 pn = palloc();
258 entries++;
259 if (phead == NULL)
260 phead = ptail = pn;
261 else {
262 ptail->next = pn;
263 ptail = pn;
264 }
265 pn->next = NULL;
266 pn->hlink = NULL;
267 *pp = pn;
268 userinfo(pn, pw);
269 pn->whead = NULL;
270 }
271 return (pn);
272 }
273
274 PERSON *
find_person(char * name)275 find_person(char *name)
276 {
277 PERSON *pn;
278
279 /* name may be only UT_NAMESIZE long and not terminated */
280 for (pn = htab[hash(name)];
281 pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0;
282 pn = pn->hlink)
283 ;
284 return (pn);
285 }
286
287 int
hash(char * name)288 hash(char *name)
289 {
290 int h, i;
291
292 h = 0;
293 /* name may be only UT_NAMESIZE long and not terminated */
294 for (i = UT_NAMESIZE; --i >= 0 && *name;)
295 h = ((h << 2 | h >> (HBITS - 2)) ^ *name++) & HMASK;
296 return (h);
297 }
298
299 PERSON *
palloc(void)300 palloc(void)
301 {
302 PERSON *p;
303
304 if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
305 err(1, "malloc");
306 return (p);
307 }
308
309 WHERE *
walloc(PERSON * pn)310 walloc(PERSON *pn)
311 {
312 WHERE *w;
313
314 if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
315 err(1, "malloc");
316 if (pn->whead == NULL)
317 pn->whead = pn->wtail = w;
318 else {
319 pn->wtail->next = w;
320 pn->wtail = w;
321 }
322 w->next = NULL;
323 return (w);
324 }
325
326 char *
prphone(char * num)327 prphone(char *num)
328 {
329 char *p;
330 int len;
331 static char pbuf[15];
332
333 /* don't touch anything if the user has their own formatting */
334 for (p = num; *p; ++p)
335 if (!isdigit((unsigned char)*p))
336 return (num);
337 len = p - num;
338 p = pbuf;
339 switch (len) {
340 case 11: /* +0-123-456-7890 */
341 *p++ = '+';
342 *p++ = *num++;
343 *p++ = '-';
344 /* FALLTHROUGH */
345 case 10: /* 012-345-6789 */
346 *p++ = *num++;
347 *p++ = *num++;
348 *p++ = *num++;
349 *p++ = '-';
350 /* FALLTHROUGH */
351 case 7: /* 012-3456 */
352 *p++ = *num++;
353 *p++ = *num++;
354 *p++ = *num++;
355 break;
356 case 5: /* x0-1234 */
357 case 4: /* x1234 */
358 *p++ = 'x';
359 *p++ = *num++;
360 break;
361 default:
362 return (num);
363 }
364 if (len != 4) {
365 *p++ = '-';
366 *p++ = *num++;
367 }
368 *p++ = *num++;
369 *p++ = *num++;
370 *p++ = *num++;
371 *p = '\0';
372 return (pbuf);
373 }
374