Annotation of src/usr.bin/finger/util.c, Revision 1.24
1.24 ! deraadt 1: /* $OpenBSD: util.c,v 1.23 2009/10/27 23:59:38 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/param.h>
39: #include <sys/stat.h>
1.6 kstailey 40: #include <err.h>
1.1 deraadt 41: #include <stdio.h>
42: #include <stdlib.h>
43: #include <ctype.h>
44: #include <string.h>
45: #include <paths.h>
46: #include <errno.h>
1.11 millert 47: #include <fcntl.h>
1.5 kstailey 48: #include <unistd.h>
1.6 kstailey 49: #include <vis.h>
1.10 mickey 50: #include <err.h>
1.1 deraadt 51: #include "finger.h"
1.5 kstailey 52: #include "extern.h"
1.1 deraadt 53:
1.19 deraadt 54: char *estrdup(char *);
55: WHERE *walloc(PERSON *pn);
56: void find_idle_and_ttywrite(WHERE *);
57: void userinfo(PERSON *, struct passwd *);
1.13 deraadt 58:
1.22 espie 59: struct storage {
60: struct storage *next;
61: char a[1];
62: };
63:
64: void
65: free_storage(struct storage *st)
66: {
67: struct storage *nx;
68:
69: while (st != NULL) {
70: nx = st->next;
71: free(st);
72: st = nx;
73: }
74: }
75:
1.5 kstailey 76: void
1.17 deraadt 77: find_idle_and_ttywrite(WHERE *w)
1.1 deraadt 78: {
79: struct stat sb;
80:
1.5 kstailey 81: (void)snprintf(tbuf, sizeof(tbuf), "%s%s", _PATH_DEV, w->tty);
1.1 deraadt 82: if (stat(tbuf, &sb) < 0) {
1.3 downsj 83: /* Don't bitch about it, just handle it... */
84: w->idletime = 0;
85: w->writable = 0;
86:
1.1 deraadt 87: return;
88: }
89: w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;
90:
91: #define TALKABLE 0220 /* tty is writable if 220 mode */
92: w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
93: }
94:
1.13 deraadt 95: char *
96: estrdup(char *s)
97: {
98: char *p = strdup(s);
1.14 deraadt 99: if (!p)
1.15 deraadt 100: err(1, "strdup");
1.13 deraadt 101: return (p);
102: }
103:
1.5 kstailey 104: void
1.17 deraadt 105: userinfo(PERSON *pn, struct passwd *pw)
1.1 deraadt 106: {
1.5 kstailey 107: char *p;
108: char *bp, name[1024];
1.1 deraadt 109: struct stat sb;
110:
111: pn->realname = pn->office = pn->officephone = pn->homephone = NULL;
112:
113: pn->uid = pw->pw_uid;
1.13 deraadt 114: pn->name = estrdup(pw->pw_name);
115: pn->dir = estrdup(pw->pw_dir);
116: pn->shell = estrdup(pw->pw_shell);
1.1 deraadt 117:
1.5 kstailey 118: (void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
1.1 deraadt 119:
120: /* ampersands get replaced by the login name */
1.5 kstailey 121: if (!(p = strsep(&bp, ",")))
1.1 deraadt 122: return;
1.5 kstailey 123: expandusername(p, pw->pw_name, name, sizeof(name));
1.13 deraadt 124: pn->realname = estrdup(name);
1.1 deraadt 125: pn->office = ((p = strsep(&bp, ",")) && *p) ?
1.13 deraadt 126: estrdup(p) : NULL;
1.1 deraadt 127: pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
1.13 deraadt 128: estrdup(p) : NULL;
1.1 deraadt 129: pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
1.13 deraadt 130: estrdup(p) : NULL;
1.5 kstailey 131: (void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILSPOOL,
132: pw->pw_name);
1.1 deraadt 133: pn->mailrecv = -1; /* -1 == not_valid */
134: if (stat(tbuf, &sb) < 0) {
135: if (errno != ENOENT) {
1.12 millert 136: warn("%s", tbuf);
1.1 deraadt 137: return;
138: }
139: } else if (sb.st_size != 0) {
140: pn->mailrecv = sb.st_mtime;
141: pn->mailread = sb.st_atime;
142: }
143: }
144:
1.5 kstailey 145: int
1.17 deraadt 146: match(struct passwd *pw, char *user)
1.1 deraadt 147: {
1.5 kstailey 148: char *p, *t;
1.1 deraadt 149: char name[1024];
150:
1.5 kstailey 151: (void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
1.1 deraadt 152:
153: /* ampersands get replaced by the login name */
154: if (!(p = strtok(p, ",")))
1.20 tedu 155: return (0);
1.5 kstailey 156: expandusername(p, pw->pw_name, name, sizeof(name));
1.7 kstailey 157: for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
1.1 deraadt 158: if (!strcasecmp(p, user))
1.20 tedu 159: return (1);
160: return (0);
1.1 deraadt 161: }
162:
1.5 kstailey 163: /* inspired by usr.sbin/sendmail/util.c::buildfname */
164: void
1.17 deraadt 165: expandusername(char *gecos, char *login, char *buf, int buflen)
1.5 kstailey 166: {
167: char *p, *bp;
168:
169: /* why do we skip asterisks!?!? */
170: if (*gecos == '*')
171: gecos++;
172: bp = buf;
173:
174: /* copy gecos, interpolating & to be full name */
175: for (p = gecos; *p != '\0'; p++) {
176: if (bp >= &buf[buflen - 1]) {
177: /* buffer overflow - just use login name */
1.21 niallo 178: strlcpy(buf, login, buflen);
1.5 kstailey 179: buf[buflen - 1] = '\0';
180: return;
181: }
182: if (*p == '&') {
183: /* interpolate full name */
1.21 niallo 184: strlcpy(bp, login, buflen - (bp - buf));
1.24 ! deraadt 185: *bp = toupper((unsigned char)*bp);
1.5 kstailey 186: bp += strlen(bp);
187: }
188: else
189: *bp++ = *p;
190: }
191: *bp = '\0';
192: }
193:
194: void
1.17 deraadt 195: enter_lastlog(PERSON *pn)
1.1 deraadt 196: {
1.5 kstailey 197: WHERE *w;
1.1 deraadt 198: static int opened, fd;
199: struct lastlog ll;
200: char doit = 0;
201:
202: /* some systems may not maintain lastlog, don't report errors. */
203: if (!opened) {
1.11 millert 204: fd = open(_PATH_LASTLOG, O_RDONLY);
1.1 deraadt 205: opened = 1;
206: }
207: if (fd == -1 ||
208: lseek(fd, (off_t)(pn->uid * sizeof(ll)), SEEK_SET) !=
1.8 deraadt 209: (long)(pn->uid * sizeof(ll)) ||
1.1 deraadt 210: read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
211: /* as if never logged in */
1.5 kstailey 212: ll.ll_line[0] = ll.ll_host[0] = '\0';
1.1 deraadt 213: ll.ll_time = 0;
214: }
215: if ((w = pn->whead) == NULL)
216: doit = 1;
217: else if (ll.ll_time != 0) {
218: /* if last login is earlier than some current login */
219: for (; !doit && w != NULL; w = w->next)
220: if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
221: doit = 1;
222: /*
223: * and if it's not any of the current logins
224: * can't use time comparison because there may be a small
225: * discrepency since login calls time() twice
226: */
227: for (w = pn->whead; doit && w != NULL; w = w->next)
228: if (w->info == LOGGEDIN &&
229: strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
230: doit = 0;
231: }
232: if (doit) {
233: w = walloc(pn);
234: w->info = LASTLOG;
235: bcopy(ll.ll_line, w->tty, UT_LINESIZE);
236: w->tty[UT_LINESIZE] = 0;
237: bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
238: w->host[UT_HOSTSIZE] = 0;
239: w->loginat = ll.ll_time;
240: }
241: }
242:
1.5 kstailey 243: void
1.17 deraadt 244: enter_where(struct utmp *ut, PERSON *pn)
1.1 deraadt 245: {
1.5 kstailey 246: WHERE *w = walloc(pn);
1.1 deraadt 247:
248: w->info = LOGGEDIN;
249: bcopy(ut->ut_line, w->tty, UT_LINESIZE);
250: w->tty[UT_LINESIZE] = 0;
251: bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
252: w->host[UT_HOSTSIZE] = 0;
253: w->loginat = (time_t)ut->ut_time;
254: find_idle_and_ttywrite(w);
255: }
256:
257: PERSON *
1.17 deraadt 258: enter_person(struct passwd *pw)
1.1 deraadt 259: {
1.5 kstailey 260: PERSON *pn, **pp;
1.1 deraadt 261:
262: for (pp = htab + hash(pw->pw_name);
1.20 tedu 263: *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0;
264: pp = &(*pp)->hlink)
1.1 deraadt 265: ;
266: if ((pn = *pp) == NULL) {
267: pn = palloc();
268: entries++;
269: if (phead == NULL)
270: phead = ptail = pn;
271: else {
272: ptail->next = pn;
273: ptail = pn;
274: }
275: pn->next = NULL;
276: pn->hlink = NULL;
277: *pp = pn;
278: userinfo(pn, pw);
279: pn->whead = NULL;
280: }
1.20 tedu 281: return (pn);
1.1 deraadt 282: }
283:
284: PERSON *
1.17 deraadt 285: find_person(char *name)
1.1 deraadt 286: {
1.5 kstailey 287: PERSON *pn;
1.1 deraadt 288:
289: /* name may be only UT_NAMESIZE long and not terminated */
290: for (pn = htab[hash(name)];
1.20 tedu 291: pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0;
292: pn = pn->hlink)
1.1 deraadt 293: ;
1.20 tedu 294: return (pn);
1.1 deraadt 295: }
296:
1.5 kstailey 297: int
1.17 deraadt 298: hash(char *name)
1.1 deraadt 299: {
1.5 kstailey 300: int h, i;
1.1 deraadt 301:
302: h = 0;
303: /* name may be only UT_NAMESIZE long and not terminated */
304: for (i = UT_NAMESIZE; --i >= 0 && *name;)
1.5 kstailey 305: h = ((h << 2 | h >> (HBITS - 2)) ^ *name++) & HMASK;
1.20 tedu 306: return (h);
1.1 deraadt 307: }
308:
309: PERSON *
1.17 deraadt 310: palloc(void)
1.1 deraadt 311: {
312: PERSON *p;
313:
1.10 mickey 314: if ((p = (PERSON *)malloc((u_int) sizeof(PERSON))) == NULL)
315: err(1, "malloc");
1.20 tedu 316: return (p);
1.1 deraadt 317: }
318:
319: WHERE *
1.17 deraadt 320: walloc(PERSON *pn)
1.1 deraadt 321: {
1.5 kstailey 322: WHERE *w;
1.1 deraadt 323:
1.10 mickey 324: if ((w = (WHERE *)malloc((u_int) sizeof(WHERE))) == NULL)
325: err(1, "malloc");
1.1 deraadt 326: if (pn->whead == NULL)
327: pn->whead = pn->wtail = w;
328: else {
329: pn->wtail->next = w;
330: pn->wtail = w;
331: }
332: w->next = NULL;
1.20 tedu 333: return (w);
1.1 deraadt 334: }
335:
336: char *
1.17 deraadt 337: prphone(char *num)
1.1 deraadt 338: {
1.5 kstailey 339: char *p;
1.1 deraadt 340: int len;
341: static char pbuf[15];
342:
343: /* don't touch anything if the user has their own formatting */
344: for (p = num; *p; ++p)
1.24 ! deraadt 345: if (!isdigit((unsigned char)*p))
1.20 tedu 346: return (num);
1.1 deraadt 347: len = p - num;
348: p = pbuf;
1.20 tedu 349: switch (len) {
1.1 deraadt 350: case 11: /* +0-123-456-7890 */
351: *p++ = '+';
352: *p++ = *num++;
353: *p++ = '-';
354: /* FALLTHROUGH */
355: case 10: /* 012-345-6789 */
356: *p++ = *num++;
357: *p++ = *num++;
358: *p++ = *num++;
359: *p++ = '-';
360: /* FALLTHROUGH */
361: case 7: /* 012-3456 */
362: *p++ = *num++;
363: *p++ = *num++;
364: *p++ = *num++;
365: break;
366: case 5: /* x0-1234 */
367: case 4: /* x1234 */
368: *p++ = 'x';
369: *p++ = *num++;
370: break;
371: default:
1.20 tedu 372: return (num);
1.1 deraadt 373: }
374: if (len != 4) {
375: *p++ = '-';
376: *p++ = *num++;
377: }
378: *p++ = *num++;
379: *p++ = *num++;
380: *p++ = *num++;
381: *p = '\0';
1.20 tedu 382: return (pbuf);
1.6 kstailey 383: }
384:
385: /* Like strvis(), but use malloc() to get the space and return a pointer
386: * to the beginning of the converted string, not the end.
387: *
1.9 millert 388: * The caller is responsible for free()'ing the returned string.
1.6 kstailey 389: */
390: char *
1.22 espie 391: vs(struct storage **exist, char *src)
1.6 kstailey 392: {
1.9 millert 393: char *dst;
1.22 espie 394: struct storage *n;
1.6 kstailey 395:
1.22 espie 396: if ((n = malloc(sizeof(struct storage) + 4 * strlen(src))) == NULL)
1.6 kstailey 397: err(1, "malloc failed");
1.22 espie 398: n->next = *exist;
399: *exist = n;
400:
401: dst = n->a;
1.6 kstailey 402:
403: strvis(dst, src, VIS_SAFE|VIS_NOSLASH);
1.20 tedu 404: return (dst);
1.1 deraadt 405: }
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