1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29
30 /*
31 * error/logging/cleanup functions for ttymon.
32 */
33
34 #include <unistd.h>
35 #include <stdlib.h>
36 #include <stdio.h>
37 #include <fcntl.h>
38 #include <string.h>
39 #include <errno.h>
40 #include <stdarg.h>
41 #include <time.h>
42 #include <sys/types.h>
43 #include <sys/stat.h>
44 #include <sys/param.h>
45 #include <signal.h>
46 #include <syslog.h>
47 #include "ttymon.h"
48 #include "tmstruct.h"
49 #include "tmextern.h"
50
51 const char *appname = "ttymon";
52
53 void
openttymonlog(void)54 openttymonlog(void)
55 {
56 int fd, ret;
57 char logfile[MAXPATHLEN];
58
59 /* the log file resides in /var/saf/pmtag/ */
60 (void) snprintf(logfile, sizeof (logfile), "%s%s/%s", LOGDIR, Tag,
61 LOGFILE);
62
63 Logfp = NULL;
64 (void) close(0);
65 if ((fd = open(logfile, O_WRONLY | O_CREAT | O_APPEND, 0444)) != -1)
66 if ((ret = fcntl(fd, F_DUPFD, 3)) == 3) {
67 /* set close-on-exec flag */
68 if (fcntl(ret, F_SETFD, FD_CLOEXEC) == 0) {
69 Logfp = fdopen(ret, "a+");
70 }
71 }
72 if (!Logfp) {
73 cons_printf("ttymon cannot create log file \"%s\": %s\n",
74 logfile, strerror(errno));
75 exit(1);
76 }
77 log(" ");
78 log("********** ttymon starting **********");
79
80 #ifdef DEBUG
81 log("fd(log)\t = %d", fileno(Logfp));
82 #endif
83 }
84
85 static void
roll_log(void)86 roll_log(void)
87 {
88 char logf[MAXPATHLEN];
89 char ologf[MAXPATHLEN];
90 char tlogf[MAXPATHLEN];
91 FILE *nlogfp;
92 struct stat buf;
93
94 (void) fprintf(Logfp, "Restarting log file\n");
95 (void) snprintf(logf, sizeof (logf), "%s%s/%s", LOGDIR, Tag, LOGFILE);
96
97 (void) snprintf(ologf, sizeof (ologf), "%s%s/%s", LOGDIR, Tag,
98 OLOGFILE);
99
100 (void) snprintf(tlogf, sizeof (tlogf), "%s%s/%s", LOGDIR, Tag,
101 TLOGFILE);
102
103 if (!stat(ologf, &buf) && rename(ologf, tlogf)) {
104 (void) fprintf(Logfp, "rename old to tmp file failed\n");
105 } else if (!stat(logf, &buf) && rename(logf, ologf)) {
106 (void) fprintf(Logfp, "rename log to old file failed\n");
107 /* Restore old log file */
108 if (!stat(tlogf, &buf) && rename(tlogf, ologf))
109 (void) fprintf(Logfp,
110 "rename tmp to old file failed\n");
111 } else if ((nlogfp = fopen(logf, "w")) != NULL) {
112 (void) fclose(Logfp);
113 Logfp = nlogfp;
114 /* reset close-on-exec */
115 (void) fcntl(fileno(Logfp), F_SETFD, 1);
116 } else {
117 (void) fprintf(Logfp, "log file open failed\n");
118 /* Restore current and old log file */
119 if (!stat(ologf, &buf) && rename(ologf, logf))
120 (void) fprintf(Logfp,
121 "rename old to log file failed\n");
122 else if (!stat(tlogf, &buf) && rename(tlogf, ologf))
123 (void) fprintf(Logfp,
124 "rename tmp to old file failed\n");
125 }
126
127 (void) unlink(tlogf); /* remove any stale tmp logfile */
128 }
129
130
131 /*
132 * vlog(msg) - common message routine.
133 * - if Logfp is NULL, write message to stderr or CONSOLE
134 */
135 static void
vlog(const char * fmt,va_list ap)136 vlog(const char *fmt, va_list ap)
137 {
138 char *timestamp; /* current time in readable form */
139 time_t clock; /* current time in seconds */
140 int fd;
141 struct stat buf;
142
143 if (Logfp) {
144 if ((fstat(fileno(Logfp), &buf) != -1) &&
145 (buf.st_size >= Logmaxsz) && !Splflag) {
146 Splflag = 1;
147 roll_log();
148 Splflag = 0;
149 }
150
151 (void) time(&clock);
152 timestamp = ctime(&clock);
153 *(strchr(timestamp, '\n')) = '\0';
154 (void) fprintf(Logfp, "%s; %ld; ", timestamp, getpid());
155 (void) vfprintf(Logfp, fmt, ap);
156 if (fmt[strlen(fmt) - 1] != '\n')
157 (void) fputc('\n', Logfp);
158 (void) fflush(Logfp);
159 } else if (isatty(STDERR_FILENO)) {
160 (void) fprintf(stderr, "%s: ", appname);
161 (void) vfprintf(stderr, fmt, ap);
162 if (fmt[strlen(fmt) - 1] != '\n')
163 (void) fputc('\n', stderr);
164 (void) fflush(stderr);
165 } else if ((fd = open(CONSOLE, O_WRONLY|O_NOCTTY)) != -1) {
166 FILE *f = fdopen(fd, "w");
167
168 (void) fprintf(f, "%s: ", appname);
169 (void) vfprintf(f, fmt, ap);
170 if (fmt[strlen(fmt) - 1] != '\n')
171 (void) fputc('\n', f);
172 (void) fclose(f);
173 } else {
174 vsyslog(LOG_CRIT, fmt, ap);
175 }
176 }
177
178 /*
179 * log(fmt, ...) - put a message into the log file
180 * - if Logfp is NULL, write message to stderr or CONSOLE
181 */
182 /*PRINTFLIKE1*/
183 void
log(const char * fmt,...)184 log(const char *fmt, ...)
185 {
186 va_list ap;
187 va_start(ap, fmt);
188 vlog(fmt, ap);
189 va_end(ap);
190 }
191
192
193 /*
194 * fatal(fmt, ...) - put a message into the log file, then exit.
195 */
196 /*PRINTFLIKE1*/
197 void
fatal(const char * fmt,...)198 fatal(const char *fmt, ...)
199 {
200 if (fmt) {
201 va_list ap;
202 va_start(ap, fmt);
203 vlog(fmt, ap);
204 va_end(ap);
205 }
206 log("********** ttymon exiting ***********");
207 exit(1);
208 }
209
210 #ifdef DEBUG
211
212 /*
213 * opendebug - open debugging file, sets global file pointer Debugfp
214 * arg: getty - if TRUE, ttymon is in getty_mode and use a different
215 * debug file
216 */
217
218 void
opendebug(int getty_mode)219 opendebug(int getty_mode)
220 {
221 int fd, ret;
222 char debugfile[BUFSIZ];
223
224 if (!getty_mode) {
225 (void) strcpy(debugfile, LOGDIR);
226 (void) strcat(debugfile, Tag);
227 (void) strcat(debugfile, "/");
228 (void) strcat(debugfile, DBGFILE);
229 if ((Debugfp = fopen(debugfile, "a+")) == NULL)
230 fatal("open debug file failed");
231 } else {
232 if ((fd = open(EX_DBG, O_WRONLY|O_APPEND|O_CREAT)) < 0)
233 fatal("open %s failed: %s", EX_DBG, errno);
234
235 if (fd >= 3) {
236 ret = fd;
237 } else {
238 if ((ret = fcntl(fd, F_DUPFD, 3)) < 0)
239 fatal("F_DUPFD fcntl failed: %s",
240 strerror(errno));
241
242 }
243 if ((Debugfp = fdopen(ret, "a+")) == NULL)
244 fatal("fdopen failed: %s", strerror(errno));
245
246 if (ret != fd)
247 (void) close(fd);
248 }
249 /* set close-on-exec flag */
250 if (fcntl(fileno(Debugfp), F_SETFD, 1) == -1)
251 fatal("F_SETFD fcntl failed: %s", strerror(errno));
252 }
253
254 /*
255 * debug(msg) - put a message into debug file
256 */
257
258 void
debug(const char * fmt,...)259 debug(const char *fmt, ...)
260 {
261 va_list ap;
262 char *timestamp; /* current time in readable form */
263 time_t clock; /* current time in seconds */
264
265 (void) time(&clock);
266 timestamp = ctime(&clock);
267 *(strchr(timestamp, '\n')) = '\0';
268
269 (void) fprintf(Debugfp, "%s; %ld; ", timestamp, getpid());
270
271 va_start(ap, fmt);
272 (void) vfprintf(Debugfp, fmt, ap);
273 va_end(ap);
274
275 (void) fprintf(Debugfp, "\n");
276 (void) fflush(Debugfp);
277 }
278 #endif
279