Annotation of src/usr.bin/finger/util.c, Revision 1.31
1.31 ! deraadt 1: /* $OpenBSD: util.c,v 1.30 2015/01/16 06:40:07 deraadt Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*
4: * Copyright (c) 1989 The Regents of the University of California.
5: * All rights reserved.
1.5 kstailey 6: * Portions Copyright (c) 1983, 1995, 1996 Eric P. Allman (woof!)
1.1 deraadt 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.
1.16 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 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:
1.5 kstailey 36: #include <sys/types.h>
37: #include <sys/uio.h>
1.1 deraadt 38: #include <sys/stat.h>
1.6 kstailey 39: #include <err.h>
1.1 deraadt 40: #include <stdio.h>
41: #include <stdlib.h>
42: #include <ctype.h>
43: #include <string.h>
44: #include <paths.h>
45: #include <errno.h>
1.11 millert 46: #include <fcntl.h>
1.5 kstailey 47: #include <unistd.h>
1.6 kstailey 48: #include <vis.h>
1.1 deraadt 49: #include "finger.h"
1.5 kstailey 50: #include "extern.h"
1.1 deraadt 51:
1.19 deraadt 52: char *estrdup(char *);
53: WHERE *walloc(PERSON *pn);
54: void find_idle_and_ttywrite(WHERE *);
55: void userinfo(PERSON *, struct passwd *);
1.13 deraadt 56:
1.5 kstailey 57: void
1.17 deraadt 58: find_idle_and_ttywrite(WHERE *w)
1.1 deraadt 59: {
60: struct stat sb;
61:
1.5 kstailey 62: (void)snprintf(tbuf, sizeof(tbuf), "%s%s", _PATH_DEV, w->tty);
1.1 deraadt 63: if (stat(tbuf, &sb) < 0) {
1.3 downsj 64: /* Don't bitch about it, just handle it... */
65: w->idletime = 0;
66: w->writable = 0;
67:
1.1 deraadt 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:
1.13 deraadt 76: char *
77: estrdup(char *s)
78: {
79: char *p = strdup(s);
1.14 deraadt 80: if (!p)
1.15 deraadt 81: err(1, "strdup");
1.13 deraadt 82: return (p);
83: }
84:
1.5 kstailey 85: void
1.17 deraadt 86: userinfo(PERSON *pn, struct passwd *pw)
1.1 deraadt 87: {
1.5 kstailey 88: char *p;
89: char *bp, name[1024];
1.1 deraadt 90: struct stat sb;
1.29 millert 91: int len;
1.1 deraadt 92:
93: pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
1.29 millert 94: pn->mailrecv = -1; /* -1 == not_valid */
1.1 deraadt 95:
96: pn->uid = pw->pw_uid;
1.13 deraadt 97: pn->name = estrdup(pw->pw_name);
98: pn->dir = estrdup(pw->pw_dir);
99: pn->shell = estrdup(pw->pw_shell);
1.1 deraadt 100:
1.26 millert 101: (void)strlcpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
1.1 deraadt 102:
103: /* ampersands get replaced by the login name */
1.5 kstailey 104: if (!(p = strsep(&bp, ",")))
1.1 deraadt 105: return;
1.5 kstailey 106: expandusername(p, pw->pw_name, name, sizeof(name));
1.29 millert 107: if (stravis(&pn->realname, p, 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,
1.5 kstailey 122: pw->pw_name);
1.29 millert 123: if (len != -1 && 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;
1.1 deraadt 132: }
133: }
134: }
135:
1.5 kstailey 136: int
1.17 deraadt 137: match(struct passwd *pw, char *user)
1.1 deraadt 138: {
1.5 kstailey 139: char *p, *t;
1.1 deraadt 140: char name[1024];
141:
1.26 millert 142: (void)strlcpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
1.1 deraadt 143:
144: /* ampersands get replaced by the login name */
145: if (!(p = strtok(p, ",")))
1.20 tedu 146: return (0);
1.5 kstailey 147: expandusername(p, pw->pw_name, name, sizeof(name));
1.7 kstailey 148: for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
1.1 deraadt 149: if (!strcasecmp(p, user))
1.20 tedu 150: return (1);
151: return (0);
1.1 deraadt 152: }
153:
1.5 kstailey 154: /* inspired by usr.sbin/sendmail/util.c::buildfname */
155: void
1.17 deraadt 156: expandusername(char *gecos, char *login, char *buf, int buflen)
1.5 kstailey 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 */
1.21 niallo 169: strlcpy(buf, login, buflen);
1.5 kstailey 170: buf[buflen - 1] = '\0';
171: return;
172: }
173: if (*p == '&') {
174: /* interpolate full name */
1.21 niallo 175: strlcpy(bp, login, buflen - (bp - buf));
1.24 deraadt 176: *bp = toupper((unsigned char)*bp);
1.5 kstailey 177: bp += strlen(bp);
178: }
179: else
180: *bp++ = *p;
181: }
182: *bp = '\0';
183: }
184:
185: void
1.17 deraadt 186: enter_lastlog(PERSON *pn)
1.1 deraadt 187: {
1.5 kstailey 188: WHERE *w;
1.1 deraadt 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) {
1.11 millert 195: fd = open(_PATH_LASTLOG, O_RDONLY);
1.1 deraadt 196: opened = 1;
197: }
198: if (fd == -1 ||
199: lseek(fd, (off_t)(pn->uid * sizeof(ll)), SEEK_SET) !=
1.8 deraadt 200: (long)(pn->uid * sizeof(ll)) ||
1.1 deraadt 201: read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
202: /* as if never logged in */
1.5 kstailey 203: ll.ll_line[0] = ll.ll_host[0] = '\0';
1.1 deraadt 204: ll.ll_time = 0;
205: }
206: if ((w = pn->whead) == NULL)
207: doit = 1;
208: else if (ll.ll_time != 0) {
209: /* if last login is earlier than some current login */
210: for (; !doit && w != NULL; w = w->next)
211: if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
212: doit = 1;
213: /*
214: * and if it's not any of the current logins
215: * can't use time comparison because there may be a small
216: * discrepency since login calls time() twice
217: */
218: for (w = pn->whead; doit && w != NULL; w = w->next)
219: if (w->info == LOGGEDIN &&
220: strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
221: doit = 0;
222: }
223: if (doit) {
224: w = walloc(pn);
225: w->info = LASTLOG;
226: bcopy(ll.ll_line, w->tty, UT_LINESIZE);
227: w->tty[UT_LINESIZE] = 0;
228: bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
229: w->host[UT_HOSTSIZE] = 0;
230: w->loginat = ll.ll_time;
231: }
232: }
233:
1.5 kstailey 234: void
1.17 deraadt 235: enter_where(struct utmp *ut, PERSON *pn)
1.1 deraadt 236: {
1.5 kstailey 237: WHERE *w = walloc(pn);
1.1 deraadt 238:
239: w->info = LOGGEDIN;
240: bcopy(ut->ut_line, w->tty, UT_LINESIZE);
241: w->tty[UT_LINESIZE] = 0;
242: bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
243: w->host[UT_HOSTSIZE] = 0;
244: w->loginat = (time_t)ut->ut_time;
245: find_idle_and_ttywrite(w);
246: }
247:
248: PERSON *
1.17 deraadt 249: enter_person(struct passwd *pw)
1.1 deraadt 250: {
1.5 kstailey 251: PERSON *pn, **pp;
1.1 deraadt 252:
253: for (pp = htab + hash(pw->pw_name);
1.20 tedu 254: *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0;
255: pp = &(*pp)->hlink)
1.1 deraadt 256: ;
257: if ((pn = *pp) == NULL) {
258: pn = palloc();
259: entries++;
260: if (phead == NULL)
261: phead = ptail = pn;
262: else {
263: ptail->next = pn;
264: ptail = pn;
265: }
266: pn->next = NULL;
267: pn->hlink = NULL;
268: *pp = pn;
269: userinfo(pn, pw);
270: pn->whead = NULL;
271: }
1.20 tedu 272: return (pn);
1.1 deraadt 273: }
274:
275: PERSON *
1.17 deraadt 276: find_person(char *name)
1.1 deraadt 277: {
1.5 kstailey 278: PERSON *pn;
1.1 deraadt 279:
280: /* name may be only UT_NAMESIZE long and not terminated */
281: for (pn = htab[hash(name)];
1.20 tedu 282: pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0;
283: pn = pn->hlink)
1.1 deraadt 284: ;
1.20 tedu 285: return (pn);
1.1 deraadt 286: }
287:
1.5 kstailey 288: int
1.17 deraadt 289: hash(char *name)
1.1 deraadt 290: {
1.5 kstailey 291: int h, i;
1.1 deraadt 292:
293: h = 0;
294: /* name may be only UT_NAMESIZE long and not terminated */
295: for (i = UT_NAMESIZE; --i >= 0 && *name;)
1.5 kstailey 296: h = ((h << 2 | h >> (HBITS - 2)) ^ *name++) & HMASK;
1.20 tedu 297: return (h);
1.1 deraadt 298: }
299:
300: PERSON *
1.17 deraadt 301: palloc(void)
1.1 deraadt 302: {
303: PERSON *p;
304:
1.31 ! deraadt 305: if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
1.10 mickey 306: err(1, "malloc");
1.20 tedu 307: return (p);
1.1 deraadt 308: }
309:
310: WHERE *
1.17 deraadt 311: walloc(PERSON *pn)
1.1 deraadt 312: {
1.5 kstailey 313: WHERE *w;
1.1 deraadt 314:
1.31 ! deraadt 315: if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
1.10 mickey 316: err(1, "malloc");
1.1 deraadt 317: if (pn->whead == NULL)
318: pn->whead = pn->wtail = w;
319: else {
320: pn->wtail->next = w;
321: pn->wtail = w;
322: }
323: w->next = NULL;
1.20 tedu 324: return (w);
1.1 deraadt 325: }
326:
327: char *
1.17 deraadt 328: prphone(char *num)
1.1 deraadt 329: {
1.5 kstailey 330: char *p;
1.1 deraadt 331: int len;
332: static char pbuf[15];
333:
334: /* don't touch anything if the user has their own formatting */
335: for (p = num; *p; ++p)
1.24 deraadt 336: if (!isdigit((unsigned char)*p))
1.20 tedu 337: return (num);
1.1 deraadt 338: len = p - num;
339: p = pbuf;
1.20 tedu 340: switch (len) {
1.1 deraadt 341: case 11: /* +0-123-456-7890 */
342: *p++ = '+';
343: *p++ = *num++;
344: *p++ = '-';
345: /* FALLTHROUGH */
346: case 10: /* 012-345-6789 */
347: *p++ = *num++;
348: *p++ = *num++;
349: *p++ = *num++;
350: *p++ = '-';
351: /* FALLTHROUGH */
352: case 7: /* 012-3456 */
353: *p++ = *num++;
354: *p++ = *num++;
355: *p++ = *num++;
356: break;
357: case 5: /* x0-1234 */
358: case 4: /* x1234 */
359: *p++ = 'x';
360: *p++ = *num++;
361: break;
362: default:
1.20 tedu 363: return (num);
1.1 deraadt 364: }
365: if (len != 4) {
366: *p++ = '-';
367: *p++ = *num++;
368: }
369: *p++ = *num++;
370: *p++ = *num++;
371: *p++ = *num++;
372: *p = '\0';
1.20 tedu 373: return (pbuf);
1.1 deraadt 374: }
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