454 lines
10 KiB
C
454 lines
10 KiB
C
/* $NetBSD: lastlogin.c,v 1.15 2011/08/31 13:31:29 joerg Exp $ */
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/*
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* Copyright (c) 1996 John M. Vinopal
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by John M. Vinopal.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: lastlogin.c,v 1.15 2011/08/31 13:31:29 joerg Exp $");
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#endif
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#include <sys/types.h>
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#include <err.h>
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#include <db.h>
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#include <errno.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <time.h>
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#include <arpa/inet.h>
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#include <sys/socket.h>
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#ifdef SUPPORT_UTMP
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#include <utmp.h>
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#endif
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#ifdef SUPPORT_UTMPX
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#include <utmpx.h>
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#endif
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#include <unistd.h>
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#include <util.h>
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struct output {
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struct timeval o_tv;
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struct sockaddr_storage o_ss;
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char o_name[64];
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char o_line[64];
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char o_host[256];
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struct output *next;
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};
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#define SORT_NONE 0x0000
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#define SORT_REVERSE 0x0001
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#define SORT_TIME 0x0002
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#define DOSORT(x) ((x) & (SORT_TIME))
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static int sortlog = SORT_NONE;
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static struct output *outstack = NULL;
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static int numeric = 0;
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static size_t namelen = UT_NAMESIZE;
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static size_t linelen = UT_LINESIZE;
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static size_t hostlen = UT_HOSTSIZE;
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static int comparelog(const void *, const void *);
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static void output(struct output *);
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#ifdef SUPPORT_UTMP
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static void process_entry(struct passwd *, struct lastlog *);
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static void dolastlog(const char *, int, char *[]);
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#endif
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#ifdef SUPPORT_UTMPX
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static void process_entryx(struct passwd *, struct lastlogx *);
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static void dolastlogx(const char *, int, char *[]);
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#endif
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static void push(struct output *);
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static const char *gethost(struct output *);
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static void sortoutput(struct output *);
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__dead static void usage(void);
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int
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main(int argc, char *argv[])
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{
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const char *logfile =
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#if defined(SUPPORT_UTMPX)
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_PATH_LASTLOGX;
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#elif defined(SUPPORT_UTMP)
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_PATH_LASTLOG;
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#else
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#error "either SUPPORT_UTMP or SUPPORT_UTMPX must be defined"
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#endif
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int ch;
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size_t len;
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while ((ch = getopt(argc, argv, "f:H:L:nN:rt")) != -1) {
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switch (ch) {
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case 'H':
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hostlen = atoi(optarg);
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break;
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case 'f':
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logfile = optarg;
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break;
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case 'L':
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linelen = atoi(optarg);
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break;
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case 'n':
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numeric++;
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break;
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case 'N':
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namelen = atoi(optarg);
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break;
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case 'r':
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sortlog |= SORT_REVERSE;
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break;
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case 't':
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sortlog |= SORT_TIME;
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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len = strlen(logfile);
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setpassent(1); /* Keep passwd file pointers open */
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#if defined(SUPPORT_UTMPX)
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if (len > 0 && logfile[len - 1] == 'x')
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dolastlogx(logfile, argc, argv);
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else
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#endif
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#if defined(SUPPORT_UTMP)
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dolastlog(logfile, argc, argv);
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#endif
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setpassent(0); /* Close passwd file pointers */
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if (outstack && DOSORT(sortlog))
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sortoutput(outstack);
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return 0;
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}
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#ifdef SUPPORT_UTMP
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static void
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dolastlog(const char *logfile, int argc, char **argv)
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{
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int i;
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FILE *fp = fopen(logfile, "r");
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struct passwd *passwd;
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struct lastlog l;
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if (fp == NULL)
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err(1, "%s", logfile);
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/* Process usernames given on the command line. */
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if (argc > 0) {
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off_t offset;
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for (i = 0; i < argc; i++) {
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if ((passwd = getpwnam(argv[i])) == NULL) {
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warnx("user '%s' not found", argv[i]);
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continue;
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}
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/* Calculate the offset into the lastlog file. */
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offset = passwd->pw_uid * sizeof(l);
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if (fseeko(fp, offset, SEEK_SET)) {
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warn("fseek error");
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continue;
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}
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if (fread(&l, sizeof(l), 1, fp) != 1) {
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warnx("fread error on '%s'", passwd->pw_name);
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clearerr(fp);
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continue;
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}
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process_entry(passwd, &l);
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}
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}
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/* Read all lastlog entries, looking for active ones */
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else {
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for (i = 0; fread(&l, sizeof(l), 1, fp) == 1; i++) {
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if (l.ll_time == 0)
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continue;
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if ((passwd = getpwuid(i)) == NULL) {
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static struct passwd p;
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static char n[32];
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snprintf(n, sizeof(n), "(%d)", i);
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p.pw_uid = i;
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p.pw_name = n;
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passwd = &p;
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}
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process_entry(passwd, &l);
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}
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if (ferror(fp))
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warnx("fread error");
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}
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(void)fclose(fp);
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}
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static void
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process_entry(struct passwd *p, struct lastlog *l)
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{
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struct output o;
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(void)strlcpy(o.o_name, p->pw_name, sizeof(o.o_name));
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(void)strlcpy(o.o_line, l->ll_line, sizeof(l->ll_line));
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(void)strlcpy(o.o_host, l->ll_host, sizeof(l->ll_host));
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o.o_tv.tv_sec = l->ll_time;
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o.o_tv.tv_usec = 0;
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(void)memset(&o.o_ss, 0, sizeof(o.o_ss));
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o.next = NULL;
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/*
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* If we are sorting it, we need all the entries in memory so
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* push the current entry onto a stack. Otherwise, we can just
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* output it.
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*/
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if (DOSORT(sortlog))
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push(&o);
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else
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output(&o);
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}
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#endif
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#ifdef SUPPORT_UTMPX
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static void
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dolastlogx(const char *logfile, int argc, char **argv)
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{
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int i = 0;
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DB *db = dbopen(logfile, O_RDONLY|O_SHLOCK, 0, DB_HASH, NULL);
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DBT key, data;
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struct lastlogx l;
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struct passwd *passwd;
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if (db == NULL)
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err(1, "%s", logfile);
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if (argc > 0) {
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for (i = 0; i < argc; i++) {
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if ((passwd = getpwnam(argv[i])) == NULL) {
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warnx("User `%s' not found", argv[i]);
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continue;
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}
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key.data = &passwd->pw_uid;
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key.size = sizeof(passwd->pw_uid);
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switch ((*db->get)(db, &key, &data, 0)) {
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case 0:
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break;
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case 1:
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warnx("User `%s' not found", passwd->pw_name);
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continue;
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case -1:
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warn("Error looking up `%s'", passwd->pw_name);
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continue;
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default:
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abort();
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}
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if (data.size != sizeof(l)) {
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errno = EFTYPE;
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err(1, "%s", logfile);
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}
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(void)memcpy(&l, data.data, sizeof(l));
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process_entryx(passwd, &l);
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}
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}
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/* Read all lastlog entries, looking for active ones */
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else {
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switch ((*db->seq)(db, &key, &data, R_FIRST)) {
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case 0:
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break;
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case 1:
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warnx("No entries found");
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(*db->close)(db);
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return;
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case -1:
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warn("Error seeking to first entry");
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(*db->close)(db);
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return;
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default:
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abort();
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}
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do {
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uid_t uid;
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if (key.size != sizeof(uid) || data.size != sizeof(l)) {
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errno = EFTYPE;
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err(1, "%s", logfile);
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}
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(void)memcpy(&uid, key.data, sizeof(uid));
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if ((passwd = getpwuid(uid)) == NULL) {
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warnx("Cannot find user for uid %lu",
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(unsigned long)uid);
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continue;
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}
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(void)memcpy(&l, data.data, sizeof(l));
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process_entryx(passwd, &l);
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} while ((i = (*db->seq)(db, &key, &data, R_NEXT)) == 0);
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switch (i) {
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case 1:
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break;
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case -1:
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warn("Error seeking to last entry");
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break;
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case 0:
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default:
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abort();
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}
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}
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(*db->close)(db);
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}
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static void
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process_entryx(struct passwd *p, struct lastlogx *l)
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{
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struct output o;
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if (numeric > 1)
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(void)snprintf(o.o_name, sizeof(o.o_name), "%d", p->pw_uid);
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else
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(void)strlcpy(o.o_name, p->pw_name, sizeof(o.o_name));
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(void)strlcpy(o.o_line, l->ll_line, sizeof(l->ll_line));
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(void)strlcpy(o.o_host, l->ll_host, sizeof(l->ll_host));
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(void)memcpy(&o.o_ss, &l->ll_ss, sizeof(o.o_ss));
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o.o_tv = l->ll_tv;
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o.next = NULL;
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/*
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* If we are sorting it, we need all the entries in memory so
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* push the current entry onto a stack. Otherwise, we can just
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* output it.
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*/
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if (DOSORT(sortlog))
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push(&o);
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else
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output(&o);
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}
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#endif
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static void
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push(struct output *o)
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{
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struct output *out;
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out = malloc(sizeof(*out));
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if (!out)
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err(EXIT_FAILURE, "malloc failed");
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(void)memcpy(out, o, sizeof(*out));
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out->next = NULL;
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if (outstack) {
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out->next = outstack;
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outstack = out;
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} else {
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outstack = out;
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}
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}
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static void
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sortoutput(struct output *o)
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{
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struct output **outs;
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struct output *tmpo;
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int num;
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int i;
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/* count the number of entries to display */
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for (num=0, tmpo = o; tmpo; tmpo=tmpo->next, num++)
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;
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outs = malloc(sizeof(*outs) * num);
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if (!outs)
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err(EXIT_FAILURE, "malloc failed");
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for (i=0, tmpo = o; i < num; tmpo=tmpo->next, i++)
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outs[i] = tmpo;
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mergesort(outs, num, sizeof(*outs), comparelog);
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for (i=0; i < num; i++)
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output(outs[i]);
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}
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static int
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comparelog(const void *left, const void *right)
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{
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const struct output *l = *(const struct output * const *)left;
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const struct output *r = *(const struct output * const *)right;
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int order = (sortlog&SORT_REVERSE)?-1:1;
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if (l->o_tv.tv_sec < r->o_tv.tv_sec)
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return 1 * order;
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if (l->o_tv.tv_sec == r->o_tv.tv_sec)
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return 0;
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return -1 * order;
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}
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static const char *
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gethost(struct output *o)
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{
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if (!numeric)
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return o->o_host;
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else {
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static char buf[512];
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buf[0] = '\0';
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(void)sockaddr_snprintf(buf, sizeof(buf), "%a",
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(struct sockaddr *)&o->o_ss);
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return buf;
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}
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}
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/* Duplicate the output of last(1) */
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static void
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output(struct output *o)
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{
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time_t t = (time_t)o->o_tv.tv_sec;
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printf("%-*.*s %-*.*s %-*.*s %s",
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(int)namelen, (int)namelen, o->o_name,
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(int)linelen, (int)linelen, o->o_line,
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(int)hostlen, (int)hostlen, gethost(o),
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t ? ctime(&t) : "Never logged in\n");
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "Usage: %s [-nrt] [-f <filename>] "
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"[-H <hostlen>] [-L <linelen>] [-N <namelen>] [user ...]\n",
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getprogname());
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exit(1);
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}
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