X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fview.cpp;fp=src%2Fbin%2Flttng%2Fcommands%2Fview.cpp;h=a2623fe49e0ccb66b4baecbf1f27552d22ffad43;hp=0000000000000000000000000000000000000000;hb=48a4000561343808724f7cb5fa8c131877489ccd;hpb=81663f073dbfb4b61c06a0ceb8ca33c4fc41b1c5 diff --git a/src/bin/lttng/commands/view.cpp b/src/bin/lttng/commands/view.cpp new file mode 100644 index 000000000..a2623fe49 --- /dev/null +++ b/src/bin/lttng/commands/view.cpp @@ -0,0 +1,233 @@ +/* + * Copyright (C) 2011 David Goulet + * + * SPDX-License-Identifier: GPL-2.0-only + * + */ + +#define _LGPL_SOURCE +#include +#include +#include +#include +#include +#include +#include + +#include +#include "../command.h" + +static char *opt_session_name; +static char *opt_viewer; +static char *opt_trace_path; + +#ifdef LTTNG_EMBED_HELP +static const char help_msg[] = +#include +; +#endif + +enum { + OPT_HELP = 1, + OPT_LIST_OPTIONS, +}; + +static struct poptOption long_options[] = { + /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ + {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, + {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, + {"viewer", 'e', POPT_ARG_STRING, &opt_viewer, 0, 0, 0}, + {"trace-path", 't', POPT_ARG_STRING, &opt_trace_path, 0, 0, 0}, + {0, 0, 0, 0, 0, 0, 0} +}; + +/* Is the session we are trying to view is in live mode. */ +static int session_live_mode; + +/* + * Build the live path we need for the lttng live view. + */ +static char *build_live_path(char *session_name) +{ + int ret; + char *path = NULL; + char hostname[LTTNG_HOST_NAME_MAX]; + + ret = gethostname(hostname, sizeof(hostname)); + if (ret < 0) { + PERROR("gethostname"); + goto error; + } + + ret = asprintf(&path, "net://localhost/host/%s/%s", hostname, + session_name); + if (ret < 0) { + PERROR("asprintf live path"); + goto error; + } + +error: + return path; +} + +/* + * Exec viewer if found and use session name path. + */ +static int view_trace(void) +{ + int ret; + char *session_name, *trace_path = NULL; + struct lttng_session *sessions = NULL; + bool free_trace_path = false; + + /* + * Safety net. If lttng is suid at some point for *any* useless reasons, + * this prevent any bad execution of binaries. + */ + if (getuid() != 0) { + if (getuid() != geteuid()) { + ERR("UID does not match effective UID."); + ret = CMD_ERROR; + goto error; + } else if (getgid() != getegid()) { + ERR("GID does not match effective GID."); + ret = CMD_ERROR; + goto error; + } + } + + /* User define trace path override the session name */ + if (opt_trace_path) { + session_name = NULL; + } else if(opt_session_name == NULL) { + session_name = get_session_name(); + if (session_name == NULL) { + ret = CMD_ERROR; + goto error; + } + } else { + session_name = opt_session_name; + } + + DBG("Viewing trace for session %s", session_name); + + if (session_name) { + int i, count, found = 0; + + /* Getting all sessions */ + count = lttng_list_sessions(&sessions); + if (count < 0) { + ERR("Unable to list sessions. Session name %s not found.", + session_name); + MSG("Is there a session daemon running?"); + ret = CMD_ERROR; + goto free_error; + } + + /* Find our session listed by the session daemon */ + for (i = 0; i < count; i++) { + if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { + found = 1; + break; + } + } + + if (!found) { + MSG("Session name %s not found", session_name); + ret = CMD_ERROR; + goto free_sessions; + } + + session_live_mode = sessions[i].live_timer_interval; + + DBG("Session live mode set to %d", session_live_mode); + + if (sessions[i].enabled && !session_live_mode) { + WARN("Session %s is running. Please stop it before reading it.", + session_name); + ret = CMD_ERROR; + goto free_sessions; + } + + /* If the timer interval is set we are in live mode. */ + if (session_live_mode) { + trace_path = build_live_path(session_name); + if (!trace_path) { + ret = CMD_ERROR; + goto free_sessions; + } + free_trace_path = true; + } else { + /* Get file system session path. */ + trace_path = sessions[i].path; + } + } else { + trace_path = opt_trace_path; + } + + MSG("Trace directory: %s\n", trace_path); + + ret = spawn_viewer(trace_path, opt_viewer, session_live_mode); + if (ret < 0) { + /* Don't set ret so lttng can interpret the sessiond error. */ + goto free_sessions; + } + +free_sessions: + if (session_live_mode && free_trace_path) { + free(trace_path); + } + free(sessions); +free_error: + if (opt_session_name == NULL) { + free(session_name); + } +error: + return ret; +} + +/* + * The 'view ' first level command + */ +int cmd_view(int argc, const char **argv) +{ + int opt, ret = CMD_SUCCESS; + static poptContext pc; + const char *leftover = NULL; + + pc = poptGetContext(NULL, argc, argv, long_options, 0); + poptReadDefaultConfig(pc, 0); + + if (lttng_opt_mi) { + WARN("mi does not apply to view command"); + } + + while ((opt = poptGetNextOpt(pc)) != -1) { + switch (opt) { + case OPT_HELP: + SHOW_HELP(); + goto end; + case OPT_LIST_OPTIONS: + list_cmd_options(stdout, long_options); + goto end; + default: + ret = CMD_UNDEFINED; + goto end; + } + } + + opt_session_name = (char*) poptGetArg(pc); + + leftover = poptGetArg(pc); + if (leftover) { + ERR("Unknown argument: %s", leftover); + ret = CMD_ERROR; + goto end; + } + + ret = view_trace(); + +end: + poptFreeContext(pc); + return ret; +}