xref: /freebsd/usr.sbin/pw/pw_log.c (revision 39ee7a7a6bdd1557b1c3532abf60d139798ac88b)
1 /*-
2  * Copyright (C) 1996
3  *	David L. Nugent.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #ifndef lint
28 static const char rcsid[] =
29   "$FreeBSD$";
30 #endif /* not lint */
31 
32 #include <fcntl.h>
33 #include <string.h>
34 #include <stdarg.h>
35 
36 #include "pw.h"
37 
38 static FILE    *logfile = NULL;
39 
40 void
41 pw_log(struct userconf * cnf, int mode, int which, char const * fmt,...)
42 {
43 	if (cnf->logfile && *cnf->logfile) {
44 		if (logfile == NULL) {	/* With umask==0 we need to control file access modes on create */
45 			int             fd = open(cnf->logfile, O_WRONLY | O_CREAT | O_APPEND, 0600);
46 
47 			if (fd != -1)
48 				logfile = fdopen(fd, "a");
49 		}
50 		if (logfile != NULL) {
51 			va_list         argp;
52 			time_t          now = time(NULL);
53 			struct tm      *t = localtime(&now);
54 			char            nfmt[256];
55 			const char     *name;
56 
57 			if ((name = getenv("LOGNAME")) == NULL && (name = getenv("USER")) == NULL)
58 				name = "unknown";
59 			/* ISO 8601 International Standard Date format */
60 			strftime(nfmt, sizeof nfmt, "%Y-%m-%d %T ", t);
61 			sprintf(nfmt + strlen(nfmt), "[%s:%s%s] %s\n", name, Which[which], Modes[mode], fmt);
62 			va_start(argp, fmt);
63 			vfprintf(logfile, nfmt, argp);
64 			va_end(argp);
65 			fflush(logfile);
66 		}
67 	}
68 }
69