src/network-live.c

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23
  24 #include <sys/socket.h>
  25 #include <sys/types.h>
  26 #include <netinet/in.h>
  27 #include <netdb.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <inttypes.h>
  34 #include <fcntl.h>
  35 #include <sys/mman.h>
  36
  37 #include "lttng-viewer.h"
  38 #include "network-live.h"
  39 #include "lttng-live-functions.h"
  40
  41 #include <babeltrace/babeltrace.h>
  42 #include <babeltrace/ctf/events.h>
  43 #include <babeltrace/ctf/callbacks.h>
  44 #include <babeltrace/ctf/iterator.h>
  45
  46 /* for packet_index */
  47 #include <babeltrace/ctf/types.h>
  48
  49 #include <babeltrace/ctf/metadata.h>
  50 #include <babeltrace/ctf-text/types.h>
  51 #include <babeltrace/ctf/events-internal.h>
  52 #include <lib/babeltrace/ctf/ctf-index.h>
  53
  54 /*
  55  * hostname parameter needs to hold NAME_MAX chars.
  56  */
  57 static int parse_url(const char *path, char *hostname, int *port,
  58                 uint64_t *session_id)
  59 {
  60         char remain[2][NAME_MAX];
  61         int ret = -1, proto, proto_offset = 0;
  62         size_t path_len = strlen(path);
  63
  64         /*
  65          * Since sscanf API does not allow easily checking string length
  66          * against a size defined by a macro. Test it beforehand on the
  67          * input. We know the output is always <= than the input length.
  68          */
  69         if (path_len > NAME_MAX) {
  70                 goto end;
  71         }
  72         ret = sscanf(path, "net%d://", &proto);
  73         if (ret < 1) {
  74                 proto = 4;
  75                 /* net:// */
  76                 proto_offset = strlen("net://");
  77         } else {
  78                 /* net4:// or net6:// */
  79                 proto_offset = strlen("netX://");
  80         }
  81         if (proto_offset > path_len) {
  82                 goto end;
  83         }
  84         /* TODO : parse for IPv6 as well */
  85         /* Parse the hostname or IP */
  86         ret = sscanf(&path[proto_offset], "%[a-zA-Z.0-9%-]%s",
  87                 hostname, remain[0]);
  88         if (ret == 2) {
  89                 /* Optional port number */
  90                 switch (remain[0][0]) {
  91                 case ':':
  92                         ret = sscanf(remain[0], ":%d%s", port, remain[1]);
  93                         /* Optional session ID with port number */
  94                         if (ret == 2) {
  95                                 ret = sscanf(remain[1], "/%" PRIu64,
  96                                         session_id);
  97                                 /* Accept 0 or 1 (optional) */
  98                                 if (ret < 0) {
  99                                         goto end;
 100                                 }
 101                         }
 102                         break;
 103                 case '/':
 104                         /* Optional session ID */
 105                         ret = sscanf(remain[0], "/%" PRIu64, session_id);
 106                         /* Accept 0 or 1 (optional) */
 107                         if (ret < 0) {
 108                                 goto end;
 109                         }
 110                         break;
 111                 default:
 112                         fprintf(stderr, "[error] wrong delimitor : %c\n",
 113                                 remain[0][0]);
 114                         ret = -1;
 115                         goto end;
 116                 }
 117         }
 118
 119         if (*port < 0)
 120                 *port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
 121
 122         if (*session_id == -1ULL)
 123                 printf_verbose("Connecting to hostname : %s, port : %d, "
 124                                 "proto : IPv%d\n",
 125                                 hostname, *port, proto);
 126         else
 127                 printf_verbose("Connecting to hostname : %s, port : %d, "
 128                                 "session id : %" PRIu64 ", proto : IPv%d\n",
 129                                 hostname, *port, *session_id, proto);
 130         ret = 0;
 131
 132 end:
 133         return ret;
 134 }
 135
 136 static int lttng_live_open_trace_read(const char *path)
 137 {
 138         char hostname[NAME_MAX];
 139         int port = -1;
 140         uint64_t session_id = -1ULL;
 141         int ret = 0;
 142         struct lttng_live_ctx ctx;
 143
 144         ctx.session = g_new0(struct lttng_live_session, 1);
 145
 146         /* We need a pointer to the context from the packet_seek function. */
 147         ctx.session->ctx = &ctx;
 148
 149         /* HT to store the CTF traces. */
 150         ctx.session->ctf_traces = g_hash_table_new(g_direct_hash,
 151                         g_direct_equal);
 152
 153         ret = parse_url(path, hostname, &port, &session_id);
 154         if (ret < 0) {
 155                 goto end_free;
 156         }
 157
 158         ret = lttng_live_connect_viewer(&ctx, hostname, port);
 159         if (ret < 0) {
 160                 fprintf(stderr, "[error] Connection failed\n");
 161                 goto end_free;
 162         }
 163         printf_verbose("LTTng-live connected to relayd\n");
 164
 165         ret = lttng_live_establish_connection(&ctx);
 166         if (ret < 0) {
 167                 goto end_free;
 168         }
 169
 170         if (session_id == -1ULL) {
 171                 printf_verbose("Listing sessions\n");
 172                 ret = lttng_live_list_sessions(&ctx, path);
 173                 if (ret < 0) {
 174                         fprintf(stderr, "[error] List error\n");
 175                         goto end_free;
 176                 }
 177         } else {
 178                 lttng_live_read(&ctx, session_id);
 179         }
 180
 181 end_free:
 182         g_hash_table_destroy(ctx.session->ctf_traces);
 183         g_free(ctx.session);
 184         g_free(ctx.session->streams);
 185         return ret;
 186 }
 187
 188 static
 189 struct bt_trace_descriptor *lttng_live_open_trace(const char *path, int flags,
 190                 void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
 191                         int whence), FILE *metadata_fp)
 192 {
 193         struct ctf_text_stream_pos *pos;
 194
 195         switch (flags & O_ACCMODE) {
 196         case O_RDONLY:
 197                 /* OK */
 198                 break;
 199         case O_RDWR:
 200                 fprintf(stderr, "[error] lttng live plugin cannot be used as output plugin.\n");
 201                 goto error;
 202         default:
 203                 fprintf(stderr, "[error] Incorrect open flags.\n");
 204                 goto error;
 205         }
 206
 207         pos = g_new0(struct ctf_text_stream_pos, 1);
 208         pos->parent.rw_table = NULL;
 209         pos->parent.event_cb = NULL;
 210         pos->parent.trace = &pos->trace_descriptor;
 211         lttng_live_open_trace_read(path);
 212         return &pos->trace_descriptor;
 213
 214 error:
 215         return NULL;
 216 }
 217
 218 static
 219 int lttng_live_close_trace(struct bt_trace_descriptor *td)
 220 {
 221         struct ctf_text_stream_pos *pos =
 222                 container_of(td, struct ctf_text_stream_pos,
 223                         trace_descriptor);
 224         free(pos);
 225         return 0;
 226 }
 227
 228 static
 229 struct bt_format lttng_live_format = {
 230         .open_trace = lttng_live_open_trace,
 231         .close_trace = lttng_live_close_trace,
 232 };
 233
 234 static
 235 void __attribute__((constructor)) lttng_live_init(void)
 236 {
 237         int ret;
 238
 239         lttng_live_format.name = g_quark_from_static_string("lttng-live");
 240         ret = bt_register_format(&lttng_live_format);
 241         assert(!ret);
 242 }
 243
 244 static
 245 void __attribute__((destructor)) lttng_live_exit(void)
 246 {
 247         bt_unregister_format(&lttng_live_format);
 248 }