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 #define LOGD_CONNECT_RETRY      10
  37
  38 enum {
  39         LOG_STDOUT,
  40         LOG_FILE,
  41         LOG_NET,
  42 };
  43
  44 enum {
  45         LOG_MSG,
  46         LOG_ID,
  47         LOG_PRIO,
  48         LOG_SOURCE,
  49         LOG_TIME,
  50         __LOG_MAX
  51 };
  52
  53 static const struct blobmsg_policy log_policy[] = {
  54         [LOG_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING },
  55         [LOG_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
  56         [LOG_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
  57         [LOG_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_INT32 },
  58         [LOG_TIME] = { .name = "time", .type = BLOBMSG_TYPE_INT64 },
  59 };
  60
  61 static struct uloop_timeout retry;
  62 static struct uloop_fd sender;
  63 static regex_t regexp_preg;
  64 static const char *log_file, *log_ip, *log_port, *log_prefix, *pid_file, *hostname, *regexp_pattern;
  65 static int log_type = LOG_STDOUT;
  66 static int log_size, log_udp, log_follow, log_trailer_null = 0;
  67 static int log_timestamp;
  68 static int logd_conn_tries = LOGD_CONNECT_RETRY;
  69
  70 static const char* getcodetext(int value, CODE *codetable) {
  71         CODE *i;
  72
  73         if (value >= 0)
  74                 for (i = codetable; i->c_val != -1; i++)
  75                         if (i->c_val == value)
  76                                 return (i->c_name);
  77         return "<unknown>";
  78 };
  79
  80 static void log_handle_reconnect(struct uloop_timeout *timeout)
  81 {
  82         sender.fd = usock((log_udp) ? (USOCK_UDP) : (USOCK_TCP), log_ip, log_port);
  83         if (sender.fd < 0) {
  84                 fprintf(stderr, "failed to connect: %m\n");
  85                 uloop_timeout_set(&retry, 1000);
  86         } else {
  87                 uloop_fd_add(&sender, ULOOP_READ);
  88                 syslog(LOG_INFO, "Logread connected to %s:%s\n", log_ip, log_port);
  89         }
  90 }
  91
  92 static void log_handle_fd(struct uloop_fd *u, unsigned int events)
  93 {
  94         if (u->eof) {
  95                 uloop_fd_delete(u);
  96                 close(sender.fd);
  97                 sender.fd = -1;
  98                 uloop_timeout_set(&retry, 1000);
  99         }
 100 }
 101
 102 static int log_notify(struct blob_attr *msg)
 103 {
 104         struct blob_attr *tb[__LOG_MAX];
 105         struct stat s;
 106         char buf[LOG_LINE_SIZE + 128];
 107         char buf_ts[32];
 108         uint32_t p;
 109         time_t t;
 110         uint32_t t_ms = 0;
 111         char *c, *m;
 112         int ret = 0;
 113
 114         if (sender.fd < 0)
 115                 return 0;
 116
 117         blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blob_data(msg), blob_len(msg));
 118         if (!tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME] || !tb[LOG_MSG])
 119                 return 1;
 120
 121         if ((log_type == LOG_FILE) && log_size && (!stat(log_file, &s)) && (s.st_size > log_size)) {
 122                 char *old = malloc(strlen(log_file) + 5);
 123
 124                 close(sender.fd);
 125                 if (old) {
 126                         sprintf(old, "%s.old", log_file);
 127                         rename(log_file, old);
 128                         free(old);
 129                 }
 130                 sender.fd = open(log_file, O_CREAT | O_WRONLY | O_APPEND, 0600);
 131                 if (sender.fd < 0) {
 132                         fprintf(stderr, "failed to open %s: %m\n", log_file);
 133                         exit(-1);
 134                 }
 135         }
 136
 137         m = blobmsg_get_string(tb[LOG_MSG]);
 138         if (regexp_pattern &&
 139             regexec(&regexp_preg, m, 0, NULL, 0) == REG_NOMATCH)
 140                 return 0;
 141         t = blobmsg_get_u64(tb[LOG_TIME]) / 1000;
 142         if (log_timestamp) {
 143                 t_ms = blobmsg_get_u64(tb[LOG_TIME]) % 1000;
 144                 snprintf(buf_ts, sizeof(buf_ts), "[%lu.%03u] ",
 145                                 (unsigned long)t, t_ms);
 146         }
 147         c = ctime(&t);
 148         p = blobmsg_get_u32(tb[LOG_PRIO]);
 149         c[strlen(c) - 1] = '\0';
 150
 151         if (log_type == LOG_NET) {
 152                 int err;
 153
 154                 snprintf(buf, sizeof(buf), "<%u>", p);
 155                 strncat(buf, c + 4, 16);
 156                 if (log_timestamp) {
 157                         strncat(buf, buf_ts, sizeof(buf) - strlen(buf) - 1);
 158                 }
 159                 if (hostname) {
 160                         strncat(buf, hostname, sizeof(buf) - strlen(buf) - 1);
 161                         strncat(buf, " ", sizeof(buf) - strlen(buf) - 1);
 162                 }
 163                 if (log_prefix) {
 164                         strncat(buf, log_prefix, sizeof(buf) - strlen(buf) - 1);
 165                         strncat(buf, ": ", sizeof(buf) - strlen(buf) - 1);
 166                 }
 167                 if (blobmsg_get_u32(tb[LOG_SOURCE]) == SOURCE_KLOG)
 168                         strncat(buf, "kernel: ", sizeof(buf) - strlen(buf) - 1);
 169                 strncat(buf, m, sizeof(buf) - strlen(buf) - 1);
 170                 if (log_udp)
 171                         err = write(sender.fd, buf, strlen(buf));
 172                 else {
 173                         size_t buflen = strlen(buf);
 174                         if (!log_trailer_null)
 175                                 buf[buflen] = '\n';
 176                         err = send(sender.fd, buf, buflen + 1, 0);
 177                 }
 178
 179                 if (err < 0) {
 180                         syslog(LOG_INFO, "failed to send log data to %s:%s via %s\n",
 181                                 log_ip, log_port, (log_udp) ? ("udp") : ("tcp"));
 182                         uloop_fd_delete(&sender);
 183                         close(sender.fd);
 184                         sender.fd = -1;
 185                         uloop_timeout_set(&retry, 1000);
 186                 }
 187         } else {
 188                 snprintf(buf, sizeof(buf), "%s %s%s.%s%s %s\n",
 189                         c, log_timestamp ? buf_ts : "",
 190                         getcodetext(LOG_FAC(p) << 3, facilitynames),
 191                         getcodetext(LOG_PRI(p), prioritynames),
 192                         (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" kernel:"), m);
 193                 ret = write(sender.fd, buf, strlen(buf));
 194         }
 195
 196         if (log_type == LOG_FILE)
 197                 fsync(sender.fd);
 198
 199         return ret;
 200 }
 201
 202 static int usage(const char *prog)
 203 {
 204         fprintf(stderr, "Usage: %s [options]\n"
 205                 "Options:\n"
 206                 "    -s <path>          Path to ubus socket\n"
 207                 "    -l <count>         Got only the last 'count' messages\n"
 208                 "    -e <pattern>       Filter messages with a regexp\n"
 209                 "    -r <server> <port> Stream message to a server\n"
 210                 "    -F <file>          Log file\n"
 211                 "    -S <bytes>         Log size\n"
 212                 "    -p <file>          PID file\n"
 213                 "    -h <hostname>      Add hostname to the message\n"
 214                 "    -P <prefix>        Prefix custom text to streamed messages\n"
 215                 "    -f                 Follow log messages\n"
 216                 "    -u                 Use UDP as the protocol\n"
 217                 "    -t                 Add an extra timestamp\n"
 218                 "    -0                 Use \\0 instead of \\n as trailer when using TCP\n"
 219                 "\n", prog);
 220         return 1;
 221 }
 222
 223 static void logread_fd_data_cb(struct ustream *s, int bytes)
 224 {
 225         while (true) {
 226                 struct blob_attr *a;
 227                 int len, cur_len;
 228
 229                 a = (void*) ustream_get_read_buf(s, &len);
 230                 if (len < sizeof(*a))
 231                         break;
 232
 233                 cur_len = blob_len(a) + sizeof(*a);
 234                 if (len < cur_len)
 235                         break;
 236
 237                 log_notify(a);
 238                 ustream_consume(s, cur_len);
 239         }
 240 }
 241
 242 static void logread_fd_state_cb(struct ustream *s)
 243 {
 244         if (log_follow)
 245                 logd_conn_tries = LOGD_CONNECT_RETRY;
 246         uloop_end();
 247 }
 248
 249 static void logread_fd_cb(struct ubus_request *req, int fd)
 250 {
 251         static struct ustream_fd test_fd;
 252
 253         memset(&test_fd, 0, sizeof(test_fd));
 254
 255         test_fd.stream.notify_read = logread_fd_data_cb;
 256         test_fd.stream.notify_state = logread_fd_state_cb;
 257         ustream_fd_init(&test_fd, fd);
 258 }
 259
 260 static void logread_setup_output(void)
 261 {
 262         if (sender.fd || sender.cb)
 263                 return;
 264
 265         if (log_ip && log_port) {
 266                 openlog("logread", LOG_PID, LOG_DAEMON);
 267                 log_type = LOG_NET;
 268                 sender.cb = log_handle_fd;
 269                 retry.cb = log_handle_reconnect;
 270                 uloop_timeout_set(&retry, 1000);
 271         } else if (log_file) {
 272                 log_type = LOG_FILE;
 273                 sender.fd = open(log_file, O_CREAT | O_WRONLY| O_APPEND, 0600);
 274                 if (sender.fd < 0) {
 275                         fprintf(stderr, "failed to open %s: %m\n", log_file);
 276                         exit(-1);
 277                 }
 278         } else {
 279                 sender.fd = STDOUT_FILENO;
 280         }
 281 }
 282
 283 int main(int argc, char **argv)
 284 {
 285         struct ubus_context *ctx;
 286         uint32_t id;
 287         const char *ubus_socket = NULL;
 288         int ch, ret, lines = 0;
 289         static struct blob_buf b;
 290
 291         signal(SIGPIPE, SIG_IGN);
 292
 293         while ((ch = getopt(argc, argv, "u0fcs:l:r:F:p:S:P:h:e:t")) != -1) {
 294                 switch (ch) {
 295                 case 'u':
 296                         log_udp = 1;
 297                         break;
 298                 case '0':
 299                         log_trailer_null = 1;
 300                         break;
 301                 case 's':
 302                         ubus_socket = optarg;
 303                         break;
 304                 case 'r':
 305                         log_ip = optarg++;
 306                         log_port = argv[optind++];
 307                         break;
 308                 case 'F':
 309                         log_file = optarg;
 310                         break;
 311                 case 'p':
 312                         pid_file = optarg;
 313                         break;
 314                 case 'P':
 315                         log_prefix = optarg;
 316                         break;
 317                 case 'f':
 318                         log_follow = 1;
 319                         break;
 320                 case 'l':
 321                         lines = atoi(optarg);
 322                         break;
 323                 case 'S':
 324                         log_size = atoi(optarg);
 325                         if (log_size < 1)
 326                                 log_size = 1;
 327                         log_size *= 1024;
 328                         break;
 329                 case 'h':
 330                         hostname = optarg;
 331                         break;
 332                 case 'e':
 333                         if (!regcomp(&regexp_preg, optarg, REG_NOSUB)) {
 334                                 regexp_pattern = optarg;
 335                         }
 336                         break;
 337                 case 't':
 338                         log_timestamp = 1;
 339                         break;
 340                 default:
 341                         return usage(*argv);
 342                 }
 343         }
 344         uloop_init();
 345
 346         ctx = ubus_connect(ubus_socket);
 347         if (!ctx) {
 348                 fprintf(stderr, "Failed to connect to ubus\n");
 349                 return -1;
 350         }
 351         ubus_add_uloop(ctx);
 352
 353         if (log_follow && pid_file) {
 354                 FILE *fp = fopen(pid_file, "w+");
 355                 if (fp) {
 356                         fprintf(fp, "%d", getpid());
 357                         fclose(fp);
 358                 }
 359         }
 360
 361         blob_buf_init(&b, 0);
 362         blobmsg_add_u8(&b, "stream", 1);
 363         blobmsg_add_u8(&b, "oneshot", !log_follow);
 364         if (lines)
 365                 blobmsg_add_u32(&b, "lines", lines);
 366         else if (log_follow)
 367                 blobmsg_add_u32(&b, "lines", 0);
 368
 369         /* ugly ugly ugly ... we need a real reconnect logic */
 370         do {
 371                 struct ubus_request req = { 0 };
 372
 373                 ret = ubus_lookup_id(ctx, "log", &id);
 374                 if (ret) {
 375                         fprintf(stderr, "Failed to find log object: %s\n", ubus_strerror(ret));
 376                         sleep(1);
 377                         continue;
 378                 }
 379                 logd_conn_tries = 0;
 380                 logread_setup_output();
 381
 382                 ubus_invoke_async(ctx, id, "read", b.head, &req);
 383                 req.fd_cb = logread_fd_cb;
 384                 ubus_complete_request_async(ctx, &req);
 385
 386                 uloop_run();
 387
 388         } while (logd_conn_tries--);
 389
 390         ubus_free(ctx);
 391         uloop_done();
 392
 393         if (log_follow && pid_file)
 394                 unlink(pid_file);
 395
 396         return ret;
 397 }