prepare the 0.3 release
[lttngtop.git] / 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-abi.h"
38 #include "network-live.h"
39 #include "lttng-live-comm.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 static volatile int should_quit;
55
56 int lttng_live_should_quit(void)
57 {
58 return should_quit;
59 }
60
61 #if 0
62 static
63 void sighandler(int sig)
64 {
65 switch (sig) {
66 case SIGTERM:
67 case SIGINT:
68 should_quit = 1;
69 break;
70 default:
71 break;
72 }
73 }
74
75 /*
76 * TODO: Eventually, this signal handler setup should be done at the
77 * plugin manager level, rather than within this plugin. Beware, we are
78 * not cleaning up the signal handler after plugin execution.
79 */
80 static
81 int setup_sighandler(void)
82 {
83 struct sigaction sa;
84 sigset_t sigset;
85 int ret;
86
87 if ((ret = sigemptyset(&sigset)) < 0) {
88 perror("sigemptyset");
89 return ret;
90 }
91 sa.sa_handler = sighandler;
92 sa.sa_mask = sigset;
93 sa.sa_flags = 0;
94 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
95 perror("sigaction");
96 return ret;
97 }
98 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
99 perror("sigaction");
100 return ret;
101 }
102 return 0;
103 }
104 #endif
105
106 /*
107 * hostname parameter needs to hold NAME_MAX chars.
108 */
109 static
110 int parse_url(const char *path, struct lttng_live_ctx *ctx)
111 {
112 char remain[3][NAME_MAX];
113 int ret = -1, proto, proto_offset = 0;
114 size_t path_len = strlen(path); /* not accounting \0 */
115
116 /*
117 * Since sscanf API does not allow easily checking string length
118 * against a size defined by a macro. Test it beforehand on the
119 * input. We know the output is always <= than the input length.
120 */
121 if (path_len >= NAME_MAX) {
122 goto end;
123 }
124 ret = sscanf(path, "net%d://", &proto);
125 if (ret < 1) {
126 proto = 4;
127 /* net:// */
128 proto_offset = strlen("net://");
129 } else {
130 /* net4:// or net6:// */
131 proto_offset = strlen("netX://");
132 }
133 if (proto_offset > path_len) {
134 goto end;
135 }
136 /* TODO : parse for IPv6 as well */
137 /* Parse the hostname or IP */
138 ret = sscanf(&path[proto_offset], "%[a-zA-Z.0-9%-]%s",
139 ctx->relay_hostname, remain[0]);
140 if (ret == 2) {
141 /* Optional port number */
142 switch (remain[0][0]) {
143 case ':':
144 ret = sscanf(remain[0], ":%d%s", &ctx->port, remain[1]);
145 /* Optional session ID with port number */
146 if (ret == 2) {
147 ret = sscanf(remain[1], "/%s", remain[2]);
148 /* Accept 0 or 1 (optional) */
149 if (ret < 0) {
150 goto end;
151 }
152 } else if (ret == 0) {
153 fprintf(stderr, "[error] Missing port number after delimitor ':'\n");
154 ret = -1;
155 goto end;
156 }
157 break;
158 case '/':
159 /* Optional session ID */
160 ret = sscanf(remain[0], "/%s", remain[2]);
161 /* Accept 0 or 1 (optional) */
162 if (ret < 0) {
163 goto end;
164 }
165 break;
166 default:
167 fprintf(stderr, "[error] wrong delimitor : %c\n",
168 remain[0][0]);
169 ret = -1;
170 goto end;
171 }
172 }
173
174 if (ctx->port < 0) {
175 ctx->port = LTTNG_DEFAULT_NETWORK_VIEWER_PORT;
176 }
177
178 if (strlen(remain[2]) == 0) {
179 printf_verbose("Connecting to hostname : %s, port : %d, "
180 "proto : IPv%d\n",
181 ctx->relay_hostname, ctx->port, proto);
182 ret = 0;
183 goto end;
184 }
185 ret = sscanf(remain[2], "host/%[a-zA-Z.0-9%-]/%s",
186 ctx->traced_hostname, ctx->session_name);
187 if (ret != 2) {
188 fprintf(stderr, "[error] Format : "
189 "net://<hostname>/host/<traced_hostname>/<session_name>\n");
190 goto end;
191 }
192
193 printf_verbose("Connecting to hostname : %s, port : %d, "
194 "traced hostname : %s, session name : %s, "
195 "proto : IPv%d\n",
196 ctx->relay_hostname, ctx->port, ctx->traced_hostname,
197 ctx->session_name, proto);
198 ret = 0;
199
200 end:
201 return ret;
202 }
203
204 static int lttng_live_open_trace_read(const char *path)
205 {
206 int ret = 0;
207 struct lttng_live_ctx *ctx;
208
209 ctx = g_new0(struct lttng_live_ctx, 1);
210 ctx->session = g_new0(struct lttng_live_session, 1);
211
212 /* We need a pointer to the context from the packet_seek function. */
213 ctx->session->ctx = ctx;
214
215 /* HT to store the CTF traces. */
216 ctx->session->ctf_traces = g_hash_table_new(g_direct_hash,
217 g_direct_equal);
218 ctx->port = -1;
219 ctx->session_ids = g_array_new(FALSE, TRUE, sizeof(uint64_t));
220
221 ret = parse_url(path, ctx);
222 if (ret < 0) {
223 goto end_free;
224 }
225 #if 0
226 ret = setup_sighandler();
227 if (ret < 0) {
228 goto end_free;
229 }
230 #endif
231 ret = lttng_live_connect_viewer(ctx);
232 if (ret < 0) {
233 goto end_free;
234 }
235 printf_verbose("LTTng-live connected to relayd\n");
236
237 ret = lttng_live_establish_connection(ctx);
238 if (ret < 0) {
239 goto end_free;
240 }
241
242 printf_verbose("Listing sessions\n");
243 ret = lttng_live_list_sessions(ctx, path);
244 if (ret < 0) {
245 goto end_free;
246 }
247
248 if (ctx->session_ids->len > 0) {
249 ret = lttng_live_read(ctx);
250 }
251
252 end_free:
253 g_hash_table_destroy(ctx->session->ctf_traces);
254 g_free(ctx->session);
255 g_free(ctx->session->streams);
256 g_free(ctx);
257
258 if (lttng_live_should_quit()) {
259 ret = 0;
260 }
261 return ret;
262 }
263
264 static
265 struct bt_trace_descriptor *lttng_live_open_trace(const char *path, int flags,
266 void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
267 int whence), FILE *metadata_fp)
268 {
269 struct ctf_text_stream_pos *pos;
270
271 switch (flags & O_ACCMODE) {
272 case O_RDONLY:
273 /* OK */
274 break;
275 case O_RDWR:
276 fprintf(stderr, "[error] lttng live plugin cannot be used as output plugin.\n");
277 goto error;
278 default:
279 fprintf(stderr, "[error] Incorrect open flags.\n");
280 goto error;
281 }
282
283 pos = g_new0(struct ctf_text_stream_pos, 1);
284 pos->parent.rw_table = NULL;
285 pos->parent.event_cb = NULL;
286 pos->parent.trace = &pos->trace_descriptor;
287 if (lttng_live_open_trace_read(path) < 0) {
288 goto error;
289 }
290 return &pos->trace_descriptor;
291
292 error:
293 return NULL;
294 }
295
296 static
297 int lttng_live_close_trace(struct bt_trace_descriptor *td)
298 {
299 struct ctf_text_stream_pos *pos =
300 container_of(td, struct ctf_text_stream_pos,
301 trace_descriptor);
302 free(pos);
303 return 0;
304 }
305
306 static
307 struct bt_format lttng_live_format = {
308 .open_trace = lttng_live_open_trace,
309 .close_trace = lttng_live_close_trace,
310 };
311
312 static
313 void __attribute__((constructor)) lttng_live_init(void)
314 {
315 int ret;
316
317 lttng_live_format.name = g_quark_from_static_string("lttng-live");
318 ret = bt_register_format(&lttng_live_format);
319 assert(!ret);
320 }
321
322 static
323 void __attribute__((destructor)) lttng_live_exit(void)
324 {
325 bt_unregister_format(&lttng_live_format);
326 }
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