log/logread.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17
  18 #include <fcntl.h>
  19 #include <time.h>
  20 #include <regex.h>
  21 #include <stdio.h>
  22 #include <unistd.h>
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25
  26 #define SYSLOG_NAMES
  27 #include <syslog.h>
  28
  29 #include <libubox/ustream.h>
  30 #include <libubox/blobmsg_json.h>
  31 #include <libubox/usock.h>
  32 #include <libubox/uloop.h>
  33 #include "libubus.h"
  34 #include "syslog.h"
  35
  36 enum {
  37         LOG_STDOUT,
  38         LOG_FILE,
  39         LOG_NET,
  40 };
  41
  42 enum {
  43         LOG_MSG,
  44         LOG_ID,
  45         LOG_PRIO,
  46         LOG_SOURCE,
  47         LOG_TIME,
  48         __LOG_MAX
  49 };
  50
  51 static const struct blobmsg_policy log_policy[] = {
  52         [LOG_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING },
  53         [LOG_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
  54         [LOG_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
  55         [LOG_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_INT32 },
  56         [LOG_TIME] = { .name = "time", .type = BLOBMSG_TYPE_INT64 },
  57 };
  58
  59 static struct uloop_timeout retry;
  60 static struct uloop_fd sender;
  61 static regex_t regexp_preg;
  62 static const char *log_file, *log_ip, *log_port, *log_prefix, *pid_file, *hostname, *regexp_pattern;
  63 static int log_type = LOG_STDOUT;
  64 static int log_size, log_udp, log_follow, log_trailer_null = 0;
  65 static int log_timestamp;
  66
  67 static const char* getcodetext(int value, CODE *codetable) {
  68         CODE *i;
  69
  70         if (value >= 0)
  71                 for (i = codetable; i->c_val != -1; i++)
  72                         if (i->c_val == value)
  73                                 return (i->c_name);
  74         return "<unknown>";
  75 };
  76
  77 static void log_handle_reconnect(struct uloop_timeout *timeout)
  78 {
  79         sender.fd = usock((log_udp) ? (USOCK_UDP) : (USOCK_TCP), log_ip, log_port);
  80         if (sender.fd < 0) {
  81                 fprintf(stderr, "failed to connect: %m\n");
  82                 uloop_timeout_set(&retry, 1000);
  83         } else {
  84                 uloop_fd_add(&sender, ULOOP_READ);
  85                 syslog(LOG_INFO, "Logread connected to %s:%s\n", log_ip, log_port);
  86         }
  87 }
  88
  89 static void log_handle_fd(struct uloop_fd *u, unsigned int events)
  90 {
  91         if (u->eof) {
  92                 uloop_fd_delete(u);
  93                 close(sender.fd);
  94                 sender.fd = -1;
  95                 uloop_timeout_set(&retry, 1000);
  96         }
  97 }
  98
  99 static int log_notify(struct blob_attr *msg)
 100 {
 101         struct blob_attr *tb[__LOG_MAX];
 102         struct stat s;
 103         char buf[LOG_LINE_SIZE + 128];
 104         char buf_ts[32];
 105         uint32_t p;
 106         time_t t;
 107         uint32_t t_ms = 0;
 108         char *c, *m;
 109         int ret = 0;
 110
 111         if (sender.fd < 0)
 112                 return 0;
 113
 114         blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blob_data(msg), blob_len(msg));
 115         if (!tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME] || !tb[LOG_MSG])
 116                 return 1;
 117
 118         if ((log_type == LOG_FILE) && log_size && (!stat(log_file, &s)) && (s.st_size > log_size)) {
 119                 char *old = malloc(strlen(log_file) + 5);
 120
 121                 close(sender.fd);
 122                 if (old) {
 123                         sprintf(old, "%s.old", log_file);
 124                         rename(log_file, old);
 125                         free(old);
 126                 }
 127                 sender.fd = open(log_file, O_CREAT | O_WRONLY | O_APPEND, 0600);
 128                 if (sender.fd < 0) {
 129                         fprintf(stderr, "failed to open %s: %m\n", log_file);
 130                         exit(-1);
 131                 }
 132         }
 133
 134         m = blobmsg_get_string(tb[LOG_MSG]);
 135         if (regexp_pattern &&
 136             regexec(&regexp_preg, m, 0, NULL, 0) == REG_NOMATCH)
 137                 return 0;
 138         t = blobmsg_get_u64(tb[LOG_TIME]) / 1000;
 139         if (log_timestamp) {
 140                 t_ms = blobmsg_get_u64(tb[LOG_TIME]) % 1000;
 141                 snprintf(buf_ts, sizeof(buf_ts), "[%lu.%03u] ",
 142                                 (unsigned long)t, t_ms);
 143         }
 144         c = ctime(&t);
 145         p = blobmsg_get_u32(tb[LOG_PRIO]);
 146         c[strlen(c) - 1] = '\0';
 147
 148         if (log_type == LOG_NET) {
 149                 int err;
 150
 151                 snprintf(buf, sizeof(buf), "<%u>", p);
 152                 strncat(buf, c + 4, 16);
 153                 if (log_timestamp) {
 154                         strncat(buf, buf_ts, sizeof(buf) - strlen(buf) - 1);
 155                 }
 156                 if (hostname) {
 157                         strncat(buf, hostname, sizeof(buf) - strlen(buf) - 1);
 158                         strncat(buf, " ", sizeof(buf) - strlen(buf) - 1);
 159                 }
 160                 if (log_prefix) {
 161                         strncat(buf, log_prefix, sizeof(buf) - strlen(buf) - 1);
 162                         strncat(buf, ": ", sizeof(buf) - strlen(buf) - 1);
 163                 }
 164                 if (blobmsg_get_u32(tb[LOG_SOURCE]) == SOURCE_KLOG)
 165                         strncat(buf, "kernel: ", sizeof(buf) - strlen(buf) - 1);
 166                 strncat(buf, m, sizeof(buf) - strlen(buf) - 1);
 167                 if (log_udp)
 168                         err = write(sender.fd, buf, strlen(buf));
 169                 else {
 170                         size_t buflen = strlen(buf);
 171                         if (!log_trailer_null)
 172                                 buf[buflen] = '\n';
 173                         err = send(sender.fd, buf, buflen + 1, 0);
 174                 }
 175
 176                 if (err < 0) {
 177                         syslog(LOG_INFO, "failed to send log data to %s:%s via %s\n",
 178                                 log_ip, log_port, (log_udp) ? ("udp") : ("tcp"));
 179                         uloop_fd_delete(&sender);
 180                         close(sender.fd);
 181                         sender.fd = -1;
 182                         uloop_timeout_set(&retry, 1000);
 183                 }
 184         } else {
 185                 snprintf(buf, sizeof(buf), "%s %s%s.%s%s %s\n",
 186                         c, log_timestamp ? buf_ts : "",
 187                         getcodetext(LOG_FAC(p) << 3, facilitynames),
 188                         getcodetext(LOG_PRI(p), prioritynames),
 189                         (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" kernel:"), m);
 190                 ret = write(sender.fd, buf, strlen(buf));
 191         }
 192
 193         if (log_type == LOG_FILE)
 194                 fsync(sender.fd);
 195
 196         return ret;
 197 }
 198
 199 static int usage(const char *prog)
 200 {
 201         fprintf(stderr, "Usage: %s [options]\n"
 202                 "Options:\n"
 203                 "    -s <path>          Path to ubus socket\n"
 204                 "    -l <count>         Got only the last 'count' messages\n"
 205                 "    -e <pattern>       Filter messages with a regexp\n"
 206                 "    -r <server> <port> Stream message to a server\n"
 207                 "    -F <file>          Log file\n"
 208                 "    -S <bytes>         Log size\n"
 209                 "    -p <file>          PID file\n"
 210                 "    -h <hostname>      Add hostname to the message\n"
 211                 "    -P <prefix>        Prefix custom text to streamed messages\n"
 212                 "    -f                 Follow log messages\n"
 213                 "    -u                 Use UDP as the protocol\n"
 214                 "    -t                 Add an extra timestamp\n"
 215                 "    -0                 Use \\0 instead of \\n as trailer when using TCP\n"
 216                 "\n", prog);
 217         return 1;
 218 }
 219
 220 static void logread_fd_data_cb(struct ustream *s, int bytes)
 221 {
 222         while (true) {
 223                 struct blob_attr *a;
 224                 int len, cur_len;
 225
 226                 a = (void*) ustream_get_read_buf(s, &len);
 227                 if (len < sizeof(*a))
 228                         break;
 229
 230                 cur_len = blob_len(a) + sizeof(*a);
 231                 if (len < cur_len)
 232                         break;
 233
 234                 log_notify(a);
 235                 ustream_consume(s, cur_len);
 236         }
 237 }
 238
 239 static void logread_fd_state_cb(struct ustream *s)
 240 {
 241         uloop_end();
 242 }
 243
 244 static void logread_fd_cb(struct ubus_request *req, int fd)
 245 {
 246         static struct ustream_fd test_fd;
 247
 248         test_fd.stream.notify_read = logread_fd_data_cb;
 249         test_fd.stream.notify_state = logread_fd_state_cb;
 250         ustream_fd_init(&test_fd, fd);
 251 }
 252
 253 static void logread_setup_output(void)
 254 {
 255         if (sender.fd || sender.cb)
 256                 return;
 257
 258         if (log_ip && log_port) {
 259                 openlog("logread", LOG_PID, LOG_DAEMON);
 260                 log_type = LOG_NET;
 261                 sender.cb = log_handle_fd;
 262                 retry.cb = log_handle_reconnect;
 263                 uloop_timeout_set(&retry, 1000);
 264         } else if (log_file) {
 265                 log_type = LOG_FILE;
 266                 sender.fd = open(log_file, O_CREAT | O_WRONLY| O_APPEND, 0600);
 267                 if (sender.fd < 0) {
 268                         fprintf(stderr, "failed to open %s: %m\n", log_file);
 269                         exit(-1);
 270                 }
 271         } else {
 272                 sender.fd = STDOUT_FILENO;
 273         }
 274 }
 275
 276 int main(int argc, char **argv)
 277 {
 278         static struct ubus_request req;
 279         struct ubus_context *ctx;
 280         uint32_t id;
 281         const char *ubus_socket = NULL;
 282         int ch, ret, lines = 0;
 283         static struct blob_buf b;
 284         int tries = 5;
 285
 286         signal(SIGPIPE, SIG_IGN);
 287
 288         while ((ch = getopt(argc, argv, "u0fcs:l:r:F:p:S:P:h:e:t")) != -1) {
 289                 switch (ch) {
 290                 case 'u':
 291                         log_udp = 1;
 292                         break;
 293                 case '0':
 294                         log_trailer_null = 1;
 295                         break;
 296                 case 's':
 297                         ubus_socket = optarg;
 298                         break;
 299                 case 'r':
 300                         log_ip = optarg++;
 301                         log_port = argv[optind++];
 302                         break;
 303                 case 'F':
 304                         log_file = optarg;
 305                         break;
 306                 case 'p':
 307                         pid_file = optarg;
 308                         break;
 309                 case 'P':
 310                         log_prefix = optarg;
 311                         break;
 312                 case 'f':
 313                         log_follow = 1;
 314                         break;
 315                 case 'l':
 316                         lines = atoi(optarg);
 317                         break;
 318                 case 'S':
 319                         log_size = atoi(optarg);
 320                         if (log_size < 1)
 321                                 log_size = 1;
 322                         log_size *= 1024;
 323                         break;
 324                 case 'h':
 325                         hostname = optarg;
 326                         break;
 327                 case 'e':
 328                         if (!regcomp(&regexp_preg, optarg, REG_NOSUB)) {
 329                                 regexp_pattern = optarg;
 330                         }
 331                         break;
 332                 case 't':
 333                         log_timestamp = 1;
 334                         break;
 335                 default:
 336                         return usage(*argv);
 337                 }
 338         }
 339         uloop_init();
 340
 341         ctx = ubus_connect(ubus_socket);
 342         if (!ctx) {
 343                 fprintf(stderr, "Failed to connect to ubus\n");
 344                 return -1;
 345         }
 346         ubus_add_uloop(ctx);
 347
 348         if (log_follow && pid_file) {
 349                 FILE *fp = fopen(pid_file, "w+");
 350                 if (fp) {
 351                         fprintf(fp, "%d", getpid());
 352                         fclose(fp);
 353                 }
 354         }
 355
 356         blob_buf_init(&b, 0);
 357         blobmsg_add_u8(&b, "stream", 1);
 358         blobmsg_add_u8(&b, "oneshot", !log_follow);
 359         if (lines)
 360                 blobmsg_add_u32(&b, "lines", lines);
 361         else if (log_follow)
 362                 blobmsg_add_u32(&b, "lines", 0);
 363
 364         /* ugly ugly ugly ... we need a real reconnect logic */
 365         do {
 366                 ret = ubus_lookup_id(ctx, "log", &id);
 367                 if (ret) {
 368                         fprintf(stderr, "Failed to find log object: %s\n", ubus_strerror(ret));
 369                         sleep(1);
 370                         continue;
 371                 }
 372
 373                 logread_setup_output();
 374
 375                         ubus_invoke_async(ctx, id, "read", b.head, &req);
 376                 req.fd_cb = logread_fd_cb;
 377                 ubus_complete_request_async(ctx, &req);
 378
 379                 uloop_run();
 380                 ubus_free(ctx);
 381                 uloop_done();
 382
 383         } while (ret && tries--);
 384
 385         if (log_follow && pid_file)
 386                 unlink(pid_file);
 387
 388         return ret;
 389 }