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4ce2e883 | 1 | /* |
4ce2e883 DC |
2 | Copyright (C) 2019 Proxmox Server Solutions GmbH |
3 | ||
814a5472 | 4 | Copyright: mini-journal is under GNU GPL, the GNU General Public License. |
4ce2e883 DC |
5 | |
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; version 2 dated June, 1991. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
18 | 02111-1307, USA. | |
19 | ||
20 | Author: Dominik Csapak <d.csapak@proxmox.com> | |
4ce2e883 DC |
21 | */ |
22 | ||
23 | #include <errno.h> | |
24 | #include <stdbool.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <systemd/sd-journal.h> | |
29 | #include <time.h> | |
30 | #include <unistd.h> | |
31 | ||
499710df | 32 | #define BUFSIZE 4095 |
4ce2e883 | 33 | |
499710df | 34 | static char buf[BUFSIZE + 1]; |
4ce2e883 DC |
35 | static size_t offset = 0; |
36 | ||
4ce2e883 DC |
37 | uint64_t get_timestamp(sd_journal *j) { |
38 | uint64_t timestamp; | |
39 | int r = sd_journal_get_realtime_usec(j, ×tamp); | |
40 | if (r < 0) { | |
4a5869e3 | 41 | fprintf(stderr, "Failed %s\n", strerror(-r)); |
b03d6da1 | 42 | return -1; |
4ce2e883 DC |
43 | } |
44 | return timestamp; | |
45 | } | |
46 | ||
47 | void print_to_buf(const char * string, uint32_t length) { | |
48 | if (!length) { | |
4a5869e3 | 49 | return; |
4ce2e883 DC |
50 | } |
51 | size_t string_offset = 0; | |
52 | size_t remaining = length; | |
53 | while (offset + remaining > BUFSIZE) { | |
f41595d3 TL |
54 | strncpy(buf + offset, string + string_offset, BUFSIZE - offset); |
55 | string_offset += BUFSIZE - offset; | |
4a5869e3 | 56 | remaining = length - string_offset; |
d1a87ba2 TL |
57 | if (write (1, buf, BUFSIZE) <= 0) { |
58 | perror("write to stdout failed"); | |
59 | exit(1); | |
60 | } | |
4a5869e3 | 61 | offset = 0; |
4ce2e883 | 62 | } |
f41595d3 | 63 | strncpy(buf + offset, string + string_offset, remaining); |
4ce2e883 DC |
64 | offset += remaining; |
65 | } | |
66 | ||
4ce2e883 DC |
67 | void print_cursor(sd_journal *j) { |
68 | int r; | |
69 | char *cursor = NULL; | |
70 | r = sd_journal_get_cursor(j, &cursor); | |
71 | if (r < 0) { | |
4a5869e3 TL |
72 | fprintf(stderr, "Failed to get cursor: %s\n", strerror(-r)); |
73 | exit(1); | |
4ce2e883 DC |
74 | } |
75 | print_to_buf(cursor, strlen(cursor)); | |
76 | print_to_buf("\n", 1); | |
77 | free(cursor); | |
78 | } | |
79 | ||
80 | void print_first_cursor(sd_journal *j) { | |
fc1f5270 | 81 | static bool printed_first_cursor = false; |
4ce2e883 | 82 | if (!printed_first_cursor) { |
4a5869e3 TL |
83 | print_cursor(j); |
84 | printed_first_cursor = true; | |
4ce2e883 DC |
85 | } |
86 | } | |
87 | ||
4ce2e883 DC |
88 | void print_reboot(sd_journal *j) { |
89 | const char *d; | |
90 | size_t l; | |
91 | int r = sd_journal_get_data(j, "_BOOT_ID", (const void **)&d, &l); | |
92 | if (r < 0) { | |
4a5869e3 TL |
93 | fprintf(stderr, "Failed %s\n", strerror(-r)); |
94 | return; | |
4ce2e883 DC |
95 | } |
96 | ||
97 | // remove '_BOOT_ID=' | |
98 | d += 9; | |
99 | l -= 9; | |
100 | ||
fc1f5270 | 101 | static char bootid[32]; |
4ce2e883 | 102 | if (bootid[0] != '\0') { // we have some bootid |
4a5869e3 TL |
103 | if (strncmp(bootid, d, l)) { // a new bootid found |
104 | strncpy(bootid, d, l); | |
105 | print_to_buf("-- Reboot --\n", 13); | |
106 | } | |
4ce2e883 | 107 | } else { |
4a5869e3 | 108 | strncpy(bootid, d, l); |
4ce2e883 DC |
109 | } |
110 | } | |
111 | ||
112 | void print_timestamp(sd_journal *j) { | |
113 | uint64_t timestamp; | |
114 | int r = sd_journal_get_realtime_usec(j, ×tamp); | |
115 | if (r < 0) { | |
4a5869e3 TL |
116 | fprintf(stderr, "Failed %s\n", strerror(-r)); |
117 | return; | |
4ce2e883 DC |
118 | } |
119 | ||
fc1f5270 TL |
120 | static uint64_t last_timestamp; |
121 | static char timestring[16]; | |
4ce2e883 | 122 | if (timestamp >= (last_timestamp+(1000*1000))) { |
4a5869e3 TL |
123 | timestamp = timestamp / (1000*1000); // usec to sec |
124 | struct tm time; | |
125 | localtime_r((time_t *)×tamp, &time); | |
126 | strftime(timestring, 16, "%b %d %T", &time); | |
127 | last_timestamp = timestamp; | |
4ce2e883 DC |
128 | } |
129 | ||
130 | print_to_buf(timestring, 15); | |
131 | } | |
132 | ||
133 | void print_pid(sd_journal *j) { | |
134 | const char *d; | |
135 | size_t l; | |
136 | int r = sd_journal_get_data(j, "_PID", (const void **)&d, &l); | |
137 | if (r < 0) { | |
f41595d3 | 138 | // we sometimes have no pid, e.g., kernel messages |
4a5869e3 | 139 | return; |
4ce2e883 DC |
140 | } |
141 | ||
142 | // remove '_PID=' | |
143 | d += 5; | |
144 | l -= 5; | |
145 | ||
146 | print_to_buf("[", 1); | |
147 | print_to_buf(d, l); | |
148 | print_to_buf("]", 1); | |
149 | } | |
150 | ||
151 | bool print_field(sd_journal *j, const char *field) { | |
152 | const char *d; | |
153 | size_t l; | |
154 | int r = sd_journal_get_data(j, field, (const void **)&d, &l); | |
155 | if (r < 0) { | |
4a5869e3 TL |
156 | // some fields do not exists |
157 | return false; | |
4ce2e883 DC |
158 | } |
159 | ||
160 | int fieldlen = strlen(field)+1; | |
161 | d += fieldlen; | |
162 | l -= fieldlen; | |
163 | print_to_buf(d, l); | |
164 | return true; | |
165 | } | |
166 | ||
167 | ||
168 | void print_line(sd_journal *j) { | |
169 | print_reboot(j); | |
170 | print_timestamp(j); | |
171 | print_to_buf(" ", 1); | |
172 | print_field(j, "_HOSTNAME"); | |
173 | print_to_buf(" ", 1); | |
174 | if (!print_field(j, "SYSLOG_IDENTIFIER") && | |
4a5869e3 TL |
175 | !print_field(j, "_COMM")) { |
176 | print_to_buf("unknown", strlen("unknown") - 1); | |
4ce2e883 DC |
177 | } |
178 | print_pid(j); | |
179 | print_to_buf(": ", 2); | |
180 | print_field(j, "MESSAGE"); | |
181 | print_to_buf("\n", 1); | |
182 | } | |
183 | ||
381acb44 TL |
184 | char *progname; |
185 | ||
186 | void usage(char *error) { | |
187 | if (error) { | |
188 | fprintf(stderr, "ERROR: %s\n", error); | |
189 | } | |
4ce2e883 | 190 | fprintf(stderr, "usage: %s [OPTIONS]\n", progname); |
de3b55a8 TL |
191 | fprintf(stderr, |
192 | " -b <timestamp>\tbegin at this UNIX epoch based timestamp\n" | |
193 | " -e <timestamp>\tend at this UNIX epoch based timestamp\n" | |
194 | " -d <directory>\tpath to a journal directory\n" | |
195 | " -n <integer>\t\tprint the last number entries logged\n" | |
196 | " -f <cursor>\t\tprint from this cursor\n" | |
197 | " -t <cursor>\t\tprint to this cursor\n" | |
198 | " -h \t\t\tthis help\n" | |
199 | "\n" | |
200 | "Passing no range option will dump all the available journal\n" | |
201 | "Giving a range conflicts with -n\n" | |
202 | "-b and -f conflict\n" | |
203 | "-e and -t conflict\n"); | |
381acb44 | 204 | exit(error ? 1 : 0); |
4ce2e883 DC |
205 | } |
206 | ||
c13468ab TL |
207 | static uint64_t arg_to_uint64(const char *argument) { |
208 | errno = 0; | |
209 | char * end; | |
210 | uint64_t value = strtoull(argument, &end, 10); | |
211 | if (errno != 0 || *end != '\0') { | |
212 | fprintf(stderr, "%s is not a valid integer number\n", argument); | |
213 | exit(1); | |
214 | } | |
215 | ||
216 | return value; | |
217 | } | |
218 | ||
219 | ||
4ce2e883 DC |
220 | int main(int argc, char *argv[]) { |
221 | uint64_t number = 0; | |
222 | const char *directory = NULL; | |
223 | const char *startcursor = NULL; | |
224 | const char *endcursor = NULL; | |
225 | uint64_t begin = 0; | |
226 | uint64_t end = 0; | |
227 | char c; | |
228 | ||
381acb44 TL |
229 | progname = argv[0]; |
230 | ||
4ce2e883 | 231 | while ((c = getopt (argc, argv, "b:e:d:n:f:t:h")) != -1) { |
4a5869e3 TL |
232 | switch (c) { |
233 | case 'b': | |
c13468ab TL |
234 | begin = arg_to_uint64(optarg); |
235 | begin = begin * 1000 * 1000; // µs | |
4a5869e3 TL |
236 | break; |
237 | case 'e': | |
c13468ab TL |
238 | end = arg_to_uint64(optarg); |
239 | end = end * 1000 * 1000; // µs | |
4a5869e3 TL |
240 | break; |
241 | case 'd': | |
242 | directory = optarg; | |
243 | break; | |
244 | case 'n': | |
c13468ab | 245 | number = arg_to_uint64(optarg); |
4a5869e3 TL |
246 | break; |
247 | case 'f': | |
248 | startcursor = optarg; | |
249 | break; | |
250 | case 't': | |
251 | endcursor = optarg; | |
252 | break; | |
253 | case 'h': | |
381acb44 | 254 | usage(NULL); |
4a5869e3 TL |
255 | break; |
256 | case '?': | |
257 | default: | |
381acb44 | 258 | usage("invalid option or missing argument"); |
4a5869e3 | 259 | } |
4ce2e883 DC |
260 | } |
261 | ||
262 | if (number && (begin || startcursor)) { | |
381acb44 | 263 | usage("-n conflicts with -b and/or -f"); |
4ce2e883 DC |
264 | } |
265 | ||
266 | if (begin && startcursor) { | |
381acb44 | 267 | usage("-b and -f conflict"); |
4ce2e883 DC |
268 | } |
269 | ||
270 | if (end && endcursor) { | |
381acb44 | 271 | usage("-e and -t conflict"); |
4ce2e883 DC |
272 | } |
273 | ||
274 | if (argc > optind) { | |
381acb44 | 275 | usage("unkown, or to many arguments"); |
4ce2e883 DC |
276 | } |
277 | ||
278 | // to prevent calling it everytime we generate a timestamp | |
279 | tzset(); | |
280 | ||
281 | int r; | |
282 | sd_journal *j; | |
283 | if (directory == NULL) { | |
4a5869e3 | 284 | r = sd_journal_open(&j, SD_JOURNAL_LOCAL_ONLY); |
4ce2e883 | 285 | } else { |
4a5869e3 | 286 | r = sd_journal_open_directory(&j, directory, 0); |
4ce2e883 DC |
287 | } |
288 | ||
289 | if (r < 0) { | |
4a5869e3 TL |
290 | fprintf(stderr, "Failed to open journal: %s\n", strerror(-r)); |
291 | return 1; | |
4ce2e883 DC |
292 | } |
293 | ||
294 | // if we want to print the last x entries, seek to cursor or end, | |
295 | // then x entries back, print the cursor and finally print the | |
296 | // entries until end or cursor | |
297 | if (number) { | |
4a5869e3 TL |
298 | if (end) { |
299 | r = sd_journal_seek_realtime_usec(j, end); | |
300 | } else if (endcursor != NULL) { | |
301 | r = sd_journal_seek_cursor(j, endcursor); | |
302 | number++; | |
303 | } else { | |
304 | r = sd_journal_seek_tail(j); | |
305 | } | |
306 | ||
307 | if (r < 0) { | |
308 | fprintf(stderr, "Failed to seek to end/cursor: %s\n", strerror(-r)); | |
309 | exit(1); | |
310 | } | |
311 | ||
312 | // seek back number entries and print cursor | |
313 | r = sd_journal_previous_skip(j, number + 1); | |
314 | if (r < 0) { | |
315 | fprintf(stderr, "Failed to seek back: %s\n", strerror(-r)); | |
316 | exit(1); | |
317 | } | |
4ce2e883 | 318 | } else { |
4a5869e3 TL |
319 | if (begin) { |
320 | r = sd_journal_seek_realtime_usec(j, begin); | |
321 | } else if (startcursor) { | |
322 | r = sd_journal_seek_cursor(j, startcursor); | |
323 | } else { | |
324 | r = sd_journal_seek_head(j); | |
325 | } | |
326 | ||
327 | if (r < 0) { | |
328 | fprintf(stderr, "Failed to seek to begin/cursor: %s\n", strerror(-r)); | |
329 | exit(1); | |
330 | } | |
331 | ||
332 | // if we have a start cursor, we want to skip the first entry | |
333 | if (startcursor) { | |
334 | r = sd_journal_next(j); | |
335 | if (r < 0) { | |
336 | fprintf(stderr, "Failed to seek to begin/cursor: %s\n", strerror(-r)); | |
337 | exit(1); | |
338 | } | |
339 | print_first_cursor(j); | |
340 | } | |
4ce2e883 DC |
341 | } |
342 | ||
343 | ||
344 | while ((r = sd_journal_next(j)) > 0 && (end == 0 || get_timestamp(j) < end)) { | |
4a5869e3 TL |
345 | print_first_cursor(j); |
346 | if (endcursor != NULL && sd_journal_test_cursor(j, endcursor)) { | |
347 | break; | |
348 | } | |
349 | print_line(j); | |
4ce2e883 DC |
350 | } |
351 | ||
352 | // print optional reboot | |
353 | print_reboot(j); | |
354 | ||
355 | // print final cursor | |
356 | print_cursor(j); | |
d1a87ba2 | 357 | sd_journal_close(j); |
4ce2e883 DC |
358 | |
359 | // print remaining buffer | |
d1a87ba2 TL |
360 | if (write (1, buf, offset) <= 0) { |
361 | perror("write to stdout failed"); | |
362 | return 1; | |
363 | } | |
4ce2e883 DC |
364 | |
365 | return 0; | |
366 | } | |
367 |