usr/src/usr.bin/finger/util.c

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Tony Nardo of the Johns Hopkins University/Applied Physics Lab.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)util.c      5.14 (Berkeley) 1/17/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <paths.h>
#include "finger.h"

find_idle_and_ttywrite(w)
        register WHERE *w;
{
        extern time_t now;
        extern int errno;
        struct stat sb;
        char *strerror();

        (void)sprintf(tbuf, "%s/%s", _PATH_DEV, w->tty);
        if (stat(tbuf, &sb) < 0) {
                (void)fprintf(stderr,
                    "finger: %s: %s\n", tbuf, strerror(errno));
                return;
        }
        w->idletime = now < sb.st_atime ? 0 : now - sb.st_atime;

#define TALKABLE        0220            /* tty is writable if 220 mode */
        w->writable = ((sb.st_mode & TALKABLE) == TALKABLE);
}

userinfo(pn, pw)
        register PERSON *pn;
        register struct passwd *pw;
{
        register char *p, *t;
        char *bp, name[1024];

        pn->realname = pn->office = pn->officephone = pn->homephone = NULL;

        pn->uid = pw->pw_uid;
        pn->name = strdup(pw->pw_name);
        pn->dir = strdup(pw->pw_dir);
        pn->shell = strdup(pw->pw_shell);

        /* why do we skip asterisks!?!? */
        (void)strcpy(bp = tbuf, pw->pw_gecos);
        if (*bp == '*')
                ++bp;

        /* ampersands get replaced by the login name */
        if (!(p = strsep(&bp, ",")))
                return;
        for (t = name; *t = *p; ++p)
                if (*t == '&') {
                        (void)strcpy(t, pw->pw_name);
                        if (islower(*t))
                                *t = toupper(*t);
                        while (*++t);
                }
                else
                        ++t;
        pn->realname = strdup(name);
        pn->office = ((p = strsep(&bp, ",")) && *p) ?
            strdup(p) : NULL;
        pn->officephone = ((p = strsep(&bp, ",")) && *p) ?
            strdup(p) : NULL;
        pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
            strdup(p) : NULL;
}

match(pw, user)
        struct passwd *pw;
        char *user;
{
        register char *p, *t;
        char name[1024];

        /* why do we skip asterisks!?!? */
        (void)strcpy(p = tbuf, pw->pw_gecos);
        if (*p == '*')
                ++p;

        /* ampersands get replaced by the login name */
        if (!(p = strtok(p, ",")))
                return(0);
        for (t = name; *t = *p; ++p)
                if (*t == '&') {
                        (void)strcpy(t, pw->pw_name);
                        while (*++t);
                }
                else
                        ++t;
        for (t = name; p = strtok(t, "\t "); t = (char *)NULL)
                if (!strcasecmp(p, user))
                        return(1);
        return(0);
}

enter_lastlog(pn)
        register PERSON *pn;
{
        register WHERE *w;
        static int opened, fd;
        struct lastlog ll;
        char doit = 0;
        off_t lseek();

        /* some systems may not maintain lastlog, don't report errors. */
        if (!opened) {
                fd = open(_PATH_LASTLOG, O_RDONLY, 0);
                opened = 1;
        }
        if (fd == -1 ||
            lseek(fd, (long)pn->uid * sizeof(ll), L_SET) !=
            (long)pn->uid * sizeof(ll) ||
            read(fd, (char *)&ll, sizeof(ll)) != sizeof(ll)) {
                        /* as if never logged in */
                        ll.ll_line[0] = ll.ll_host[0] = NULL;
                        ll.ll_time = 0;
                }
        if ((w = pn->whead) == NULL)
                doit = 1;
        else if (ll.ll_time != 0) {
                /* if last login is earlier than some current login */
                for (; !doit && w != NULL; w = w->next)
                        if (w->info == LOGGEDIN && w->loginat < ll.ll_time)
                                doit = 1;
                /*
                 * and if it's not any of the current logins
                 * can't use time comparison because there may be a small
                 * discrepency since login calls time() twice
                 */
                for (w = pn->whead; doit && w != NULL; w = w->next)
                        if (w->info == LOGGEDIN &&
                            strncmp(w->tty, ll.ll_line, UT_LINESIZE) == 0)
                                doit = 0;
        }
        if (doit) {
                w = walloc(pn);
                w->info = LASTLOG;
                bcopy(ll.ll_line, w->tty, UT_LINESIZE);
                w->tty[UT_LINESIZE] = 0;
                bcopy(ll.ll_host, w->host, UT_HOSTSIZE);
                w->host[UT_HOSTSIZE] = 0;
                w->loginat = ll.ll_time;
        }
}

enter_where(ut, pn)
        struct utmp *ut;
        PERSON *pn;
{
        register WHERE *w = walloc(pn);

        w->info = LOGGEDIN;
        bcopy(ut->ut_line, w->tty, UT_LINESIZE);
        w->tty[UT_LINESIZE] = 0;
        bcopy(ut->ut_host, w->host, UT_HOSTSIZE);
        w->host[UT_HOSTSIZE] = 0;
        w->loginat = (time_t)ut->ut_time;
        find_idle_and_ttywrite(w);
}

PERSON *
enter_person(pw)
        register struct passwd *pw;
{
        register PERSON *pn, **pp;

        for (pp = htab + hash(pw->pw_name);
             *pp != NULL && strcmp((*pp)->name, pw->pw_name) != 0;
             pp = &(*pp)->hlink)
                ;
        if ((pn = *pp) == NULL) {
                pn = palloc();
                entries++;
                if (phead == NULL)
                        phead = ptail = pn;
                else {
                        ptail->next = pn;
                        ptail = pn;
                }
                pn->next = NULL;
                pn->hlink = NULL;
                *pp = pn;
                userinfo(pn, pw);
                pn->whead = NULL;
        }
        return(pn);
}

PERSON *
find_person(name)
        char *name;
{
        register PERSON *pn;

        /* name may be only UT_NAMESIZE long and not terminated */
        for (pn = htab[hash(name)];
             pn != NULL && strncmp(pn->name, name, UT_NAMESIZE) != 0;
             pn = pn->hlink)
                ;
        return(pn);
}

hash(name)
        register char *name;
{
        register int h, i;

        h = 0;
        /* name may be only UT_NAMESIZE long and not terminated */
        for (i = UT_NAMESIZE; --i >= 0 && *name;)
                h = ((h << 2 | h >> HBITS - 2) ^ *name++) & HMASK;
        return(h);
}

PERSON *
palloc()
{
        PERSON *p;

        if ((p = (PERSON *)malloc((u_int) sizeof(PERSON))) == NULL) {
                (void)fprintf(stderr, "finger: out of space.\n");
                exit(1);
        }
        return(p);
}

WHERE *
walloc(pn)
        register PERSON *pn;
{
        register WHERE *w;

        if ((w = (WHERE *)malloc((u_int) sizeof(WHERE))) == NULL) {
                (void)fprintf(stderr, "finger: out of space.\n");
                exit(1);
        }
        if (pn->whead == NULL)
                pn->whead = pn->wtail = w;
        else {
                pn->wtail->next = w;
                pn->wtail = w;
        }
        w->next = NULL;
        return(w);
}

char *
prphone(num)
        char *num;
{
        register char *p;
        int len;
        static char pbuf[15];

        /* don't touch anything if the user has their own formatting */
        for (p = num; *p; ++p)
                if (!isdigit(*p))
                        return(num);
        len = p - num;
        p = pbuf;
        switch(len) {
        case 11:                        /* +0-123-456-7890 */
                *p++ = '+';
                *p++ = *num++;
                *p++ = '-';
                /* FALLTHROUGH */
        case 10:                        /* 012-345-6789 */
                *p++ = *num++;
                *p++ = *num++;
                *p++ = *num++;
                *p++ = '-';
                /* FALLTHROUGH */
        case 7:                         /* 012-3456 */
                *p++ = *num++;
                *p++ = *num++;
                *p++ = *num++;
                break;
        case 5:                         /* x0-1234 */
                *p++ = 'x';
                *p++ = *num++;
                break;
        default:
                return(num);
        }
        *p++ = '-';
        *p++ = *num++;
        *p++ = *num++;
        *p++ = *num++;
        *p++ = *num++;
        *p = '\0';
        return(pbuf);
}