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Commit | Line | Data |
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78d5ceac | 1 | /* |
fa9baa80 | 2 | * utmpdump |
78d5ceac | 3 | * |
fa9baa80 KZ |
4 | * Simple program to dump UTMP and WTMP files in raw format, so they can be |
5 | * examined. | |
78d5ceac | 6 | * |
fa9baa80 | 7 | * Based on utmpdump dump from sysvinit suite. |
78d5ceac | 8 | * |
fa9baa80 | 9 | * Copyright (C) 1991-2000 Miquel van Smoorenburg <miquels@cistron.nl> |
78d5ceac | 10 | * |
fa9baa80 KZ |
11 | * Copyright (C) 1998 Danek Duvall <duvall@alumni.princeton.edu> |
12 | * Copyright (C) 2012 Karel Zak <kzak@redhat.com> | |
78d5ceac | 13 | * |
fa9baa80 KZ |
14 | * This program is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by | |
16 | * the Free Software Foundation; either version 2 of the License, or | |
17 | * (at your option) any later version. | |
78d5ceac | 18 | * |
fa9baa80 KZ |
19 | * This program is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
78d5ceac | 23 | * |
fa9baa80 KZ |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with this program; if not, write to the Free Software | |
26 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
78d5ceac | 27 | */ |
78d5ceac KZ |
28 | #include <stdio.h> |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
b4b919fe | 31 | #include <utmpx.h> |
78d5ceac KZ |
32 | #include <time.h> |
33 | #include <ctype.h> | |
9e15c93d | 34 | #include <getopt.h> |
78d5ceac KZ |
35 | #include <unistd.h> |
36 | #include <netinet/in.h> | |
37 | #include <arpa/inet.h> | |
7346f2b6 SK |
38 | #include <sys/stat.h> |
39 | #ifdef HAVE_INOTIFY_INIT | |
40 | #include <sys/inotify.h> | |
41 | #endif | |
78d5ceac | 42 | |
23031b99 KZ |
43 | #include "c.h" |
44 | #include "nls.h" | |
34f4d961 | 45 | #include "xalloc.h" |
23031b99 | 46 | #include "closestream.h" |
b72a75e9 | 47 | #include "timeutils.h" |
23031b99 | 48 | |
34f4d961 | 49 | static time_t strtotime(const char *s_time) |
78d5ceac KZ |
50 | { |
51 | struct tm tm; | |
fa9baa80 | 52 | |
78d5ceac KZ |
53 | memset(&tm, '\0', sizeof(struct tm)); |
54 | ||
55 | if (s_time[0] == ' ' || s_time[0] == '\0') | |
56 | return (time_t)0; | |
57 | ||
1173d0a6 SK |
58 | if (isdigit(s_time[0])) { |
59 | /* [1998-09-01T01:00:00,000000+00:00] | |
60 | * Subseconds are parsed with strtousec(). Timezone is | |
61 | * always UTC-0 */ | |
62 | strptime(s_time, "%Y-%m-%dT%H:%M:%S", &tm); | |
63 | } else { | |
64 | /* [Tue Sep 01 00:00:00 1998 GMT] */ | |
65 | strptime(s_time, "%a %b %d %T %Y", &tm); | |
66 | /* Cheesy way of checking for DST. This could be needed | |
67 | * with legacy dumps that used localtime(3). */ | |
68 | if (s_time[26] == 'D') | |
69 | tm.tm_isdst = 1; | |
70 | } | |
3749bdce | 71 | return timegm(&tm); |
78d5ceac KZ |
72 | } |
73 | ||
1173d0a6 SK |
74 | static suseconds_t strtousec(const char *s_time) |
75 | { | |
76 | const char *s = strchr(s_time, ','); | |
77 | if (s) | |
78 | return (suseconds_t) atoi(s + 1); | |
79 | return 0; | |
80 | } | |
1173d0a6 | 81 | |
78d5ceac | 82 | #define cleanse(x) xcleanse(x, sizeof(x)) |
34f4d961 | 83 | static void xcleanse(char *s, int len) |
78d5ceac KZ |
84 | { |
85 | for ( ; *s && len-- > 0; s++) | |
86 | if (!isprint(*s) || *s == '[' || *s == ']') | |
87 | *s = '?'; | |
88 | } | |
89 | ||
b4b919fe | 90 | static void print_utline(struct utmpx *ut, FILE *out) |
78d5ceac | 91 | { |
1173d0a6 | 92 | const char *addr_string; |
ee508c15 | 93 | char buffer[INET6_ADDRSTRLEN]; |
1173d0a6 SK |
94 | char time_string[40]; |
95 | struct timeval tv; | |
ee508c15 | 96 | |
912a7077 KZ |
97 | if (ut->ut_addr_v6[1] || ut->ut_addr_v6[2] || ut->ut_addr_v6[3]) |
98 | addr_string = inet_ntop(AF_INET6, &(ut->ut_addr_v6), buffer, sizeof(buffer)); | |
ee508c15 | 99 | else |
912a7077 | 100 | addr_string = inet_ntop(AF_INET, &(ut->ut_addr_v6), buffer, sizeof(buffer)); |
78d5ceac | 101 | |
1173d0a6 SK |
102 | tv.tv_sec = ut->ut_tv.tv_sec; |
103 | tv.tv_usec = ut->ut_tv.tv_usec; | |
104 | ||
4111bb3a | 105 | if (strtimeval_iso(&tv, ISO_TIMESTAMP_COMMA_GT, time_string, |
1173d0a6 SK |
106 | sizeof(time_string)) != 0) |
107 | return; | |
912a7077 KZ |
108 | cleanse(ut->ut_id); |
109 | cleanse(ut->ut_user); | |
110 | cleanse(ut->ut_line); | |
111 | cleanse(ut->ut_host); | |
78d5ceac | 112 | |
f718c2fc | 113 | /* type pid id user line host addr time */ |
1173d0a6 | 114 | fprintf(out, "[%d] [%05d] [%-4.4s] [%-*.*s] [%-*.*s] [%-*.*s] [%-15s] [%s]\n", |
f718c2fc RM |
115 | ut->ut_type, ut->ut_pid, ut->ut_id, |
116 | 8, (int)sizeof(ut->ut_user), ut->ut_user, | |
117 | 12, (int)sizeof(ut->ut_line), ut->ut_line, | |
118 | 20, (int)sizeof(ut->ut_host), ut->ut_host, | |
cd903a0e | 119 | addr_string, time_string); |
78d5ceac KZ |
120 | } |
121 | ||
7346f2b6 SK |
122 | #ifdef HAVE_INOTIFY_INIT |
123 | #define EVENTS (IN_MODIFY|IN_DELETE_SELF|IN_MOVE_SELF|IN_UNMOUNT) | |
124 | #define NEVENTS 4 | |
125 | ||
930954d8 | 126 | static void roll_file(const char *filename, off_t *size, FILE *out) |
78d5ceac | 127 | { |
930954d8 | 128 | FILE *in; |
7346f2b6 | 129 | struct stat st; |
b4b919fe | 130 | struct utmpx ut; |
7346f2b6 | 131 | off_t pos; |
78d5ceac | 132 | |
930954d8 | 133 | if (!(in = fopen(filename, "r"))) |
289dcc90 | 134 | err(EXIT_FAILURE, _("cannot open %s"), filename); |
7346f2b6 | 135 | |
930954d8 | 136 | if (fstat(fileno(in), &st) == -1) |
fc14ceba | 137 | err(EXIT_FAILURE, _("stat of %s failed"), filename); |
7346f2b6 | 138 | |
faebdd91 KZ |
139 | if (st.st_size == *size) |
140 | goto done; | |
78d5ceac | 141 | |
930954d8 SK |
142 | if (fseek(in, *size, SEEK_SET) != (off_t) -1) { |
143 | while (fread(&ut, sizeof(ut), 1, in) == 1) | |
912a7077 | 144 | print_utline(&ut, out); |
7346f2b6 SK |
145 | } |
146 | ||
930954d8 | 147 | pos = ftello(in); |
7346f2b6 SK |
148 | /* If we've successfully read something, use the file position, this |
149 | * avoids data duplication. If we read nothing or hit an error, | |
150 | * reset to the reported size, this handles truncated files. | |
151 | */ | |
152 | *size = (pos != -1 && pos != *size) ? pos : st.st_size; | |
153 | ||
faebdd91 | 154 | done: |
930954d8 | 155 | fclose(in); |
7346f2b6 SK |
156 | } |
157 | ||
930954d8 | 158 | static int follow_by_inotify(FILE *in, const char *filename, FILE *out) |
7346f2b6 SK |
159 | { |
160 | char buf[NEVENTS * sizeof(struct inotify_event)]; | |
7346f2b6 SK |
161 | int fd, wd, event; |
162 | ssize_t length; | |
163 | off_t size; | |
164 | ||
165 | fd = inotify_init(); | |
166 | if (fd == -1) | |
167 | return -1; /* probably reached any limit ... */ | |
168 | ||
930954d8 SK |
169 | size = ftello(in); |
170 | fclose(in); | |
7346f2b6 | 171 | |
e868cfb0 KZ |
172 | if (size < 0) |
173 | err(EXIT_FAILURE, _("%s: cannot get file position"), filename); | |
174 | ||
7346f2b6 SK |
175 | wd = inotify_add_watch(fd, filename, EVENTS); |
176 | if (wd == -1) | |
177 | err(EXIT_FAILURE, _("%s: cannot add inotify watch."), filename); | |
178 | ||
179 | while (wd >= 0) { | |
180 | errno = 0; | |
181 | length = read(fd, buf, sizeof(buf)); | |
182 | ||
183 | if (length < 0 && (errno == EINTR || errno == EAGAIN)) | |
184 | continue; | |
185 | if (length < 0) | |
186 | err(EXIT_FAILURE, _("%s: cannot read inotify events"), | |
187 | filename); | |
188 | ||
189 | for (event = 0; event < length;) { | |
190 | struct inotify_event *ev = | |
191 | (struct inotify_event *) &buf[event]; | |
192 | ||
193 | if (ev->mask & IN_MODIFY) | |
930954d8 | 194 | roll_file(filename, &size, out); |
7346f2b6 SK |
195 | else { |
196 | close(wd); | |
197 | wd = -1; | |
198 | break; | |
199 | } | |
200 | event += sizeof(struct inotify_event) + ev->len; | |
201 | } | |
202 | } | |
203 | ||
204 | close(fd); | |
205 | return 0; | |
206 | } | |
207 | #endif /* HAVE_INOTIFY_INIT */ | |
208 | ||
930954d8 | 209 | static FILE *dump(FILE *in, const char *filename, int follow, FILE *out) |
7346f2b6 | 210 | { |
b4b919fe | 211 | struct utmpx ut; |
7346f2b6 SK |
212 | |
213 | if (follow) | |
85dd024d | 214 | ignore_result( fseek(in, -10 * sizeof(ut), SEEK_END) ); |
7346f2b6 | 215 | |
930954d8 | 216 | while (fread(&ut, sizeof(ut), 1, in) == 1) |
912a7077 | 217 | print_utline(&ut, out); |
7346f2b6 SK |
218 | |
219 | if (!follow) | |
930954d8 | 220 | return in; |
faebdd91 | 221 | |
7346f2b6 | 222 | #ifdef HAVE_INOTIFY_INIT |
930954d8 | 223 | if (follow_by_inotify(in, filename, out) == 0) |
faebdd91 | 224 | return NULL; /* file already closed */ |
7346f2b6 | 225 | #endif |
042f62df RP |
226 | /* fallback for systems without inotify or with non-free |
227 | * inotify instances */ | |
228 | for (;;) { | |
229 | while (fread(&ut, sizeof(ut), 1, in) == 1) | |
230 | print_utline(&ut, out); | |
231 | sleep(1); | |
232 | } | |
faebdd91 | 233 | |
930954d8 | 234 | return in; |
78d5ceac KZ |
235 | } |
236 | ||
7346f2b6 | 237 | |
78d5ceac KZ |
238 | /* This function won't work properly if there's a ']' or a ' ' in the real |
239 | * token. Thankfully, this should never happen. */ | |
34f4d961 | 240 | static int gettok(char *line, char *dest, int size, int eatspace) |
78d5ceac KZ |
241 | { |
242 | int bpos, epos, eaten; | |
78d5ceac KZ |
243 | |
244 | bpos = strchr(line, '[') - line; | |
704bd903 KZ |
245 | if (bpos < 0) |
246 | errx(EXIT_FAILURE, _("Extraneous newline in file. Exiting.")); | |
78d5ceac | 247 | |
704bd903 | 248 | line += 1 + bpos; |
78d5ceac | 249 | epos = strchr(line, ']') - line; |
704bd903 | 250 | if (epos < 0) |
cd903a0e | 251 | errx(EXIT_FAILURE, _("Extraneous newline in file. Exiting.")); |
78d5ceac | 252 | |
704bd903 | 253 | line[epos] = '\0'; |
78d5ceac KZ |
254 | eaten = bpos + epos + 1; |
255 | ||
704bd903 | 256 | if (eatspace) { |
e31926b4 | 257 | char *t; |
cd903a0e SK |
258 | if ((t = strchr(line, ' '))) |
259 | *t = 0; | |
704bd903 | 260 | } |
cd903a0e | 261 | strncpy(dest, line, size); |
78d5ceac KZ |
262 | |
263 | return eaten + 1; | |
264 | } | |
265 | ||
930954d8 | 266 | static void undump(FILE *in, FILE *out) |
78d5ceac | 267 | { |
b4b919fe | 268 | struct utmpx ut; |
ee508c15 | 269 | char s_addr[INET6_ADDRSTRLEN + 1], s_time[29], *linestart, *line; |
78d5ceac | 270 | |
ad20f0d8 | 271 | linestart = xmalloc(1024 * sizeof(*linestart)); |
78d5ceac KZ |
272 | s_time[28] = 0; |
273 | ||
930954d8 | 274 | while (fgets(linestart, 1023, in)) { |
78d5ceac | 275 | line = linestart; |
cd903a0e SK |
276 | memset(&ut, '\0', sizeof(ut)); |
277 | sscanf(line, "[%hd] [%d] [%4c] ", &ut.ut_type, &ut.ut_pid, ut.ut_id); | |
78d5ceac KZ |
278 | |
279 | line += 19; | |
cd903a0e SK |
280 | line += gettok(line, ut.ut_user, sizeof(ut.ut_user), 1); |
281 | line += gettok(line, ut.ut_line, sizeof(ut.ut_line), 1); | |
282 | line += gettok(line, ut.ut_host, sizeof(ut.ut_host), 1); | |
283 | line += gettok(line, s_addr, sizeof(s_addr) - 1, 1); | |
ad20f0d8 | 284 | gettok(line, s_time, sizeof(s_time) - 1, 0); |
ee508c15 SK |
285 | if (strchr(s_addr, '.')) |
286 | inet_pton(AF_INET, s_addr, &(ut.ut_addr_v6)); | |
287 | else | |
288 | inet_pton(AF_INET6, s_addr, &(ut.ut_addr_v6)); | |
55771f54 | 289 | |
cfa7fe89 | 290 | ut.ut_tv.tv_sec = strtotime(s_time); |
1173d0a6 | 291 | ut.ut_tv.tv_usec = strtousec(s_time); |
55771f54 | 292 | |
930954d8 | 293 | ignore_result( fwrite(&ut, sizeof(ut), 1, out) ); |
78d5ceac KZ |
294 | } |
295 | ||
296 | free(linestart); | |
297 | } | |
298 | ||
86be6a32 | 299 | static void __attribute__((__noreturn__)) usage(void) |
78d5ceac | 300 | { |
86be6a32 | 301 | FILE *out = stdout; |
c8a6af07 KZ |
302 | fputs(USAGE_HEADER, out); |
303 | ||
304 | fprintf(out, | |
4810de91 | 305 | _(" %s [options] [filename]\n"), program_invocation_short_name); |
c8a6af07 | 306 | |
451dbcfa BS |
307 | fputs(USAGE_SEPARATOR, out); |
308 | fputs(_("Dump UTMP and WTMP files in raw format.\n"), out); | |
309 | ||
c8a6af07 | 310 | fputs(USAGE_OPTIONS, out); |
930954d8 SK |
311 | fputs(_(" -f, --follow output appended data as the file grows\n"), out); |
312 | fputs(_(" -r, --reverse write back dumped data into utmp file\n"), out); | |
313 | fputs(_(" -o, --output <file> write to file instead of standard output\n"), out); | |
f45f3ec3 | 314 | printf(USAGE_HELP_OPTIONS(22)); |
c8a6af07 | 315 | |
f45f3ec3 | 316 | printf(USAGE_MAN_TAIL("utmpdump(1)")); |
86be6a32 | 317 | exit(EXIT_SUCCESS); |
78d5ceac KZ |
318 | } |
319 | ||
320 | int main(int argc, char **argv) | |
321 | { | |
322 | int c; | |
930954d8 | 323 | FILE *in = NULL, *out = NULL; |
faebdd91 | 324 | int reverse = 0, follow = 0; |
704bd903 | 325 | const char *filename = NULL; |
78d5ceac | 326 | |
9e15c93d | 327 | static const struct option longopts[] = { |
87918040 SK |
328 | { "follow", no_argument, NULL, 'f' }, |
329 | { "reverse", no_argument, NULL, 'r' }, | |
330 | { "output", required_argument, NULL, 'o' }, | |
331 | { "help", no_argument, NULL, 'h' }, | |
332 | { "version", no_argument, NULL, 'V' }, | |
333 | { NULL, 0, NULL, 0 } | |
9e15c93d KZ |
334 | }; |
335 | ||
23031b99 KZ |
336 | setlocale(LC_ALL, ""); |
337 | bindtextdomain(PACKAGE, LOCALEDIR); | |
338 | textdomain(PACKAGE); | |
2c308875 | 339 | close_stdout_atexit(); |
23031b99 | 340 | |
930954d8 | 341 | while ((c = getopt_long(argc, argv, "fro:hV", longopts, NULL)) != -1) { |
78d5ceac KZ |
342 | switch (c) { |
343 | case 'r': | |
344 | reverse = 1; | |
345 | break; | |
346 | ||
347 | case 'f': | |
faebdd91 | 348 | follow = 1; |
78d5ceac KZ |
349 | break; |
350 | ||
930954d8 SK |
351 | case 'o': |
352 | out = fopen(optarg, "w"); | |
353 | if (!out) | |
354 | err(EXIT_FAILURE, _("cannot open %s"), | |
355 | optarg); | |
356 | break; | |
357 | ||
78d5ceac | 358 | case 'h': |
86be6a32 | 359 | usage(); |
9e15c93d | 360 | case 'V': |
2c308875 | 361 | print_version(EXIT_SUCCESS); |
78d5ceac | 362 | default: |
677ec86c | 363 | errtryhelp(EXIT_FAILURE); |
78d5ceac KZ |
364 | } |
365 | } | |
366 | ||
930954d8 SK |
367 | if (!out) |
368 | out = stdout; | |
369 | ||
78d5ceac | 370 | if (optind < argc) { |
704bd903 | 371 | filename = argv[optind]; |
930954d8 SK |
372 | in = fopen(filename, "r"); |
373 | if (!in) | |
289dcc90 | 374 | err(EXIT_FAILURE, _("cannot open %s"), filename); |
704bd903 | 375 | } else { |
faebdd91 KZ |
376 | if (follow) |
377 | errx(EXIT_FAILURE, _("following standard input is unsupported")); | |
5ec1ad13 | 378 | filename = "/dev/stdin"; |
930954d8 | 379 | in = stdin; |
78d5ceac KZ |
380 | } |
381 | ||
704bd903 KZ |
382 | if (reverse) { |
383 | fprintf(stderr, _("Utmp undump of %s\n"), filename); | |
930954d8 | 384 | undump(in, out); |
704bd903 KZ |
385 | } else { |
386 | fprintf(stderr, _("Utmp dump of %s\n"), filename); | |
930954d8 | 387 | in = dump(in, filename, follow, out); |
704bd903 KZ |
388 | } |
389 | ||
74ce680a SK |
390 | if (out != stdout && close_stream(out)) |
391 | err(EXIT_FAILURE, _("write failed")); | |
930954d8 SK |
392 | |
393 | if (in && in != stdin) | |
394 | fclose(in); | |
78d5ceac | 395 | |
704bd903 | 396 | return EXIT_SUCCESS; |
78d5ceac | 397 | } |