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 <stdio.h>
  21 #include <unistd.h>
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24
  25 #define SYSLOG_NAMES
  26 #include <syslog.h>
  27
  28 #include <libubox/blobmsg_json.h>
  29 #include <libubox/usock.h>
  30 #include <libubox/uloop.h>
  31 #include "libubus.h"
  32
  33 enum {
  34         LOG_STDOUT,
  35         LOG_FILE,
  36         LOG_NET,
  37 };
  38
  39 enum {
  40         LOG_MSG,
  41         LOG_ID,
  42         LOG_PRIO,
  43         LOG_SOURCE,
  44         LOG_TIME,
  45         __LOG_MAX
  46 };
  47
  48 static const struct blobmsg_policy log_policy[] = {
  49         [LOG_MSG] = { .name = "msg", .type = BLOBMSG_TYPE_STRING },
  50         [LOG_ID] = { .name = "id", .type = BLOBMSG_TYPE_INT32 },
  51         [LOG_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
  52         [LOG_SOURCE] = { .name = "source", .type = BLOBMSG_TYPE_INT32 },
  53         [LOG_TIME] = { .name = "time", .type = BLOBMSG_TYPE_INT64 },
  54 };
  55
  56 static struct ubus_subscriber log_event;
  57 static struct uloop_timeout retry;
  58 static struct uloop_fd sender;
  59 static const char *log_file, *log_ip, *log_port, *pid_file;
  60 static int log_type = LOG_STDOUT;
  61 static int log_size, log_udp;
  62
  63 static const char* getcodetext(int value, CODE *codetable) {
  64         CODE *i;
  65
  66         if (value >= 0)
  67                 for (i = codetable; i->c_val != -1; i++)
  68                         if (i->c_val == value)
  69                                 return (i->c_name);
  70         return "<unknown>";
  71 };
  72
  73 static void log_handle_reconnect(struct uloop_timeout *timeout)
  74 {
  75         sender.fd = usock((log_udp) ? (USOCK_UDP) : (USOCK_TCP), log_ip, log_port);
  76         if (sender.fd < 0) {
  77                 fprintf(stderr, "failed to connect: %s\n", strerror(errno));
  78                 uloop_timeout_set(&retry, 1000);
  79         } else {
  80                 uloop_fd_add(&sender, ULOOP_READ);
  81                 syslog(0, "Logread connected to %s:%s\n", log_ip, log_port);
  82         }
  83 }
  84
  85 static void log_handle_remove(struct ubus_context *ctx, struct ubus_subscriber *s,
  86                         uint32_t id)
  87 {
  88         fprintf(stderr, "Object %08x went away\n", id);
  89 }
  90
  91 static void log_handle_fd(struct uloop_fd *u, unsigned int events)
  92 {
  93         if (u->eof) {
  94                 uloop_fd_delete(u);
  95                 close(sender.fd);
  96                 sender.fd = -1;
  97                 uloop_timeout_set(&retry, 1000);
  98         }
  99 }
 100
 101 static int log_notify(struct ubus_context *ctx, struct ubus_object *obj,
 102                         struct ubus_request_data *req, const char *method,
 103                         struct blob_attr *msg)
 104 {
 105         struct blob_attr *tb[__LOG_MAX];
 106         struct stat s;
 107         char buf[256];
 108         uint32_t p;
 109         char *str;
 110         time_t t;
 111         char *c;
 112
 113         if (sender.fd < 0)
 114                 return 0;
 115
 116         blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blob_data(msg), blob_len(msg));
 117         if (!tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME])
 118                 return 1;
 119
 120         if ((log_type == LOG_FILE) && log_size && (!stat(log_file, &s)) && (s.st_size > log_size)) {
 121                 char *old = malloc(strlen(log_file) + 5);
 122
 123                 close(sender.fd);
 124                 if (old) {
 125                         sprintf(old, "%s.old", log_file);
 126                         rename(log_file, old);
 127                         free(old);
 128                 }
 129                 sender.fd = open(log_file, O_CREAT | O_WRONLY | O_APPEND, 0600);
 130                 if (sender.fd < 0) {
 131 //                      fprintf(stderr, "failed to open %s: %s\n", log_file, strerror(errno));
 132                         exit(-1);
 133                 }
 134         }
 135
 136         t = blobmsg_get_u64(tb[LOG_TIME]) / 1000;
 137         c = ctime(&t);
 138         p = blobmsg_get_u32(tb[LOG_PRIO]);
 139         c[strlen(c) - 1] = '\0';
 140         str = blobmsg_format_json(msg, true);
 141         if (log_type == LOG_NET) {
 142                 int err;
 143
 144                 snprintf(buf, sizeof(buf), "%s%s\n",
 145                         (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : ("kernel: "),
 146                         method);
 147                 if (log_udp)
 148                         err = write(sender.fd, buf, strlen(buf));
 149                 else
 150                         err = send(sender.fd, buf, strlen(buf), 0);
 151
 152                 if (err < 0) {
 153                         syslog(0, "failed to send log data to %s:%s via %s\n",
 154                                 log_ip, log_port, (log_udp) ? ("udp") : ("tcp"));
 155                         uloop_fd_delete(&sender);
 156                         close(sender.fd);
 157                         sender.fd = -1;
 158                         uloop_timeout_set(&retry, 1000);
 159                 }
 160         } else {
 161                 snprintf(buf, sizeof(buf), "%s %s.%s%s %s\n",
 162                         c, getcodetext(LOG_FAC(p) << 3, facilitynames), getcodetext(LOG_PRI(p), prioritynames),
 163                         (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" kernel:"),
 164                         method);
 165                 write(sender.fd, buf, strlen(buf));
 166         }
 167
 168         free(str);
 169         if (log_type == LOG_FILE)
 170                 fsync(sender.fd);
 171
 172         return 0;
 173 }
 174
 175 static void follow_log(struct ubus_context *ctx, int id)
 176 {
 177         FILE *fp;
 178         int ret;
 179
 180         signal(SIGPIPE, SIG_IGN);
 181
 182         if (pid_file) {
 183                 fp = fopen(pid_file, "w+");
 184                 if (fp) {
 185                         fprintf(fp, "%d", getpid());
 186                         fclose(fp);
 187                 }
 188         }
 189
 190         uloop_init();
 191         ubus_add_uloop(ctx);
 192
 193         log_event.remove_cb = log_handle_remove;
 194         log_event.cb = log_notify;
 195         ret = ubus_register_subscriber(ctx, &log_event);
 196         if (ret)
 197                 fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
 198
 199         ret = ubus_subscribe(ctx, &log_event, id);
 200         if (ret)
 201                 fprintf(stderr, "Failed to add watch handler: %s\n", ubus_strerror(ret));
 202
 203         if (log_ip && log_port) {
 204                 openlog("logread", LOG_PID, LOG_DAEMON);
 205                 log_type = LOG_NET;
 206                 sender.cb = log_handle_fd;
 207                 retry.cb = log_handle_reconnect;
 208                 uloop_timeout_set(&retry, 1000);
 209         } else if (log_file) {
 210                 log_type = LOG_FILE;
 211                 sender.fd = open(log_file, O_CREAT | O_WRONLY| O_APPEND, 0600);
 212                 if (sender.fd < 0) {
 213                         fprintf(stderr, "failed to open %s: %s\n", log_file, strerror(errno));
 214                         exit(-1);
 215                 }
 216         } else {
 217                 sender.fd = STDOUT_FILENO;
 218         }
 219
 220         uloop_run();
 221         ubus_free(ctx);
 222         uloop_done();
 223 }
 224
 225 enum {
 226         READ_LINE,
 227         __READ_MAX
 228 };
 229
 230
 231
 232 static const struct blobmsg_policy read_policy[] = {
 233         [READ_LINE] = { .name = "lines", .type = BLOBMSG_TYPE_ARRAY },
 234 };
 235
 236 static void read_cb(struct ubus_request *req, int type, struct blob_attr *msg)
 237 {
 238         struct blob_attr *cur;
 239         struct blob_attr *_tb[__READ_MAX];
 240         time_t t;
 241         int rem;
 242
 243         if (!msg)
 244                 return;
 245
 246         blobmsg_parse(read_policy, ARRAY_SIZE(read_policy), _tb, blob_data(msg), blob_len(msg));
 247         if (!_tb[READ_LINE])
 248                 return;
 249         blobmsg_for_each_attr(cur, _tb[READ_LINE], rem) {
 250                 struct blob_attr *tb[__LOG_MAX];
 251                 uint32_t p;
 252                 char *c;
 253
 254                 if (blobmsg_type(cur) != BLOBMSG_TYPE_TABLE)
 255                         continue;
 256
 257                 blobmsg_parse(log_policy, ARRAY_SIZE(log_policy), tb, blobmsg_data(cur), blobmsg_data_len(cur));
 258                 if (!tb[LOG_MSG] || !tb[LOG_ID] || !tb[LOG_PRIO] || !tb[LOG_SOURCE] || !tb[LOG_TIME])
 259                         continue;
 260
 261                 t = blobmsg_get_u64(tb[LOG_TIME]);
 262                 p = blobmsg_get_u32(tb[LOG_PRIO]);
 263                 c = ctime(&t);
 264                 c[strlen(c) - 1] = '\0';
 265
 266                 printf("%s %s.%s%s %s\n",
 267                         c, getcodetext(LOG_FAC(p) << 3, facilitynames), getcodetext(LOG_PRI(p), prioritynames),
 268                         (blobmsg_get_u32(tb[LOG_SOURCE])) ? ("") : (" kernel:"),
 269                         blobmsg_get_string(tb[LOG_MSG]));
 270         }
 271 }
 272
 273 static int usage(const char *prog)
 274 {
 275         fprintf(stderr, "Usage: %s [options]\n"
 276                 "Options:\n"
 277                 "    -s <path>          Path to ubus socket\n"
 278                 "    -l <count>         Got only the last 'count' messages\n"
 279                 "    -r <server> <port> Stream message to a server\n"
 280                 "    -F <file>          Log file\n"
 281                 "    -S <bytes>         Log size\n"
 282                 "    -p <file>          PID file\n"
 283                 "    -f                 Follow log messages\n"
 284                 "    -u                 Use UDP as the protocol\n"
 285                 "\n", prog);
 286         return 1;
 287 }
 288
 289 int main(int argc, char **argv)
 290 {
 291         struct ubus_context *ctx;
 292         uint32_t id;
 293         const char *ubus_socket = NULL;
 294         int ch, ret, subscribe = 0, lines = 0;
 295         static struct blob_buf b;
 296
 297         while ((ch = getopt(argc, argv, "ufcs:l:r:F:p:S:")) != -1) {
 298                 switch (ch) {
 299                 case 'u':
 300                         log_udp = 1;
 301                         break;
 302                 case 's':
 303                         ubus_socket = optarg;
 304                         break;
 305                 case 'r':
 306                         log_ip = optarg++;
 307                         log_port = argv[optind++];
 308                         break;
 309                 case 'F':
 310                         log_file = optarg;
 311                         break;
 312                 case 'p':
 313                         pid_file = optarg;
 314                         break;
 315                 case 'f':
 316                         subscribe = 1;
 317                         break;
 318                 case 'l':
 319                         lines = atoi(optarg);
 320                         break;
 321                 case 'S':
 322                         log_size = atoi(optarg);
 323                         if (log_size < 1)
 324                                 log_size = 1;
 325                         log_size *= 1024;
 326                         break;
 327                 default:
 328                         return usage(*argv);
 329                 }
 330         }
 331
 332         ctx = ubus_connect(ubus_socket);
 333         if (!ctx) {
 334                 fprintf(stderr, "Failed to connect to ubus\n");
 335                 return -1;
 336         }
 337
 338         ret = ubus_lookup_id(ctx, "log", &id);
 339         if (ret)
 340                 fprintf(stderr, "Failed to find log object: %s\n", ubus_strerror(ret));
 341
 342         if (!subscribe || lines) {
 343                 blob_buf_init(&b, 0);
 344                 if (lines)
 345                         blobmsg_add_u32(&b, "lines", lines);
 346                 ubus_invoke(ctx, id, "read", b.head, read_cb, 0, 3000);
 347         }
 348
 349         if (subscribe)
 350                 follow_log(ctx, id);
 351
 352         return 0;
 353 }