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

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)util.c      5.18 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <db.h>
#include <pwd.h>
#include <utmp.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <paths.h>
#include "finger.h"

static void      find_idle_and_ttywrite __P((WHERE *));
static void      userinfo __P((PERSON *, struct passwd *));
static WHERE    *walloc __P((PERSON *));

int
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);
}

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

        /* 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), SEEK_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;
        }
}

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

        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;
{
        DBT data, key;
        PERSON *pn;

        if (db == NULL &&
            (db = dbopen(NULL, O_RDWR, 0, DB_BTREE, NULL)) == NULL)
                err("%s", strerror(errno));

        key.data = pw->pw_name;
        key.size = strlen(pw->pw_name);

        switch((*db->get)(db, &key, &data, 0)) {
        case 0:
                return(*(PERSON **)data.data);
        default:
        case -1:
                err("db get: %s", strerror(errno));
                /* NOTREACHED */
        case 1:
                ++entries;
                pn = palloc();
                userinfo(pn, pw);
                pn->whead = NULL;

                data.size = sizeof(PERSON *);
                data.data = &pn;
                if ((*db->put)(db, &key, &data, 0))
                        err("%s", strerror(errno));
                return(pn);
        }
}

PERSON *
find_person(name)
        char *name;
{
        register int cnt;
        DBT data, key;
        char buf[UT_NAMESIZE + 1];

        if (!db)
                return(NULL);

        /* Name may be only UT_NAMESIZE long and not NUL terminated. */
        for (cnt = 0; cnt < UT_NAMESIZE && *name; ++name, ++cnt)
                buf[cnt] = *name;
        buf[cnt] = '\0';
        key.data = buf;
        key.size = cnt;

        return((*db->get)(db, &key, &data, 0) ? NULL : *(PERSON **)data.data);
}

PERSON *
palloc()
{
        PERSON *p;

        if ((p = malloc((u_int) sizeof(PERSON))) == NULL)
                err("%s", strerror(errno));
        return(p);
}

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

        if ((w = malloc((u_int) sizeof(WHERE))) == NULL)
                err("%s", strerror(errno));
        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);
}

static void
find_idle_and_ttywrite(w)
        register WHERE *w;
{
        extern time_t now;
        struct stat sb;

        (void)snprintf(tbuf, sizeof(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);
}

static void
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;
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
        char *fmt;
        va_dcl
#endif
{
        va_list ap;
#if __STDC__
        va_start(ap, fmt);
#else
        va_start(ap);
#endif
        (void)fprintf(stderr, "finger: ");
        (void)vfprintf(stderr, fmt, ap);
        va_end(ap);
        (void)fprintf(stderr, "\n");
        exit(1);
        /* NOTREACHED */
}