X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Flttng.c;h=4d2df2deb999832f1d816eefc44ebb441e7ce614;hp=34ccd59c517a6a737f8953cc717f4de28e8f9f60;hb=92360082fd291a95695fb612d773ae1bb991c256;hpb=d7c5d39f7874e8acaa38a18405eb8ccdf67be5cc diff --git a/src/bin/lttng/lttng.c b/src/bin/lttng/lttng.c index 34ccd59c5..4d2df2deb 100644 --- a/src/bin/lttng/lttng.c +++ b/src/bin/lttng/lttng.c @@ -30,15 +30,16 @@ #include #include +#include #include "command.h" /* Variables */ static char *progname; -static int opt_no_sessiond; -static char *opt_sessiond_path; -static pid_t sessiond_pid; -static volatile int recv_child_signal; +int opt_no_sessiond; +char *opt_sessiond_path; +pid_t sessiond_pid; +volatile int recv_child_signal; char *opt_relayd_path; @@ -84,6 +85,8 @@ static struct cmd_struct commands[] = { { "snapshot", cmd_snapshot}, { "save", cmd_save}, { "load", cmd_load}, + { "track", cmd_track}, + { "untrack", cmd_untrack}, { NULL, NULL} /* Array closure */ }; @@ -125,6 +128,8 @@ static void usage(FILE *ofp) fprintf(ofp, " view Start trace viewer\n"); fprintf(ofp, " save Save session configuration\n"); fprintf(ofp, " load Load session configuration\n"); + fprintf(ofp, " track Track specific system resources\n"); + fprintf(ofp, " untrack Untrack specific system resources\n"); fprintf(ofp, "\n"); fprintf(ofp, "Each command also has its own -h, --help option.\n"); fprintf(ofp, "\n"); @@ -238,7 +243,7 @@ static int set_signal_handler(void) sigset_t sigset; if ((ret = sigemptyset(&sigset)) < 0) { - perror("sigemptyset"); + PERROR("sigemptyset"); goto end; } @@ -246,17 +251,17 @@ static int set_signal_handler(void) sa.sa_mask = sigset; sa.sa_flags = 0; if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { - perror("sigaction"); + PERROR("sigaction"); goto end; } if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { - perror("sigaction"); + PERROR("sigaction"); goto end; } if ((ret = sigaction(SIGCHLD, &sa, NULL)) < 0) { - perror("sigaction"); + PERROR("sigaction"); goto end; } @@ -301,140 +306,6 @@ end: return ret; } -/* - * spawn_sessiond - * - * Spawn a session daemon by forking and execv. - */ -static int spawn_sessiond(char *pathname) -{ - int ret = 0; - pid_t pid; - - MSG("Spawning a session daemon"); - recv_child_signal = 0; - pid = fork(); - if (pid == 0) { - /* - * Spawn session daemon and tell - * it to signal us when ready. - */ - execlp(pathname, "lttng-sessiond", "--sig-parent", "--quiet", NULL); - /* execlp only returns if error happened */ - if (errno == ENOENT) { - ERR("No session daemon found. Use --sessiond-path."); - } else { - perror("execlp"); - } - kill(getppid(), SIGTERM); /* wake parent */ - exit(EXIT_FAILURE); - } else if (pid > 0) { - sessiond_pid = pid; - /* - * Wait for lttng-sessiond to start. We need to use a flag to check if - * the signal has been sent to us, because the child can be scheduled - * before the parent, and thus send the signal before this check. In - * the signal handler, we set the recv_child_signal flag, so anytime we - * check it after the fork is fine. Note that sleep() is interrupted - * before the 1 second delay as soon as the signal is received, so it - * will not cause visible delay for the user. - */ - while (!recv_child_signal) { - sleep(1); - } - /* - * The signal handler will nullify sessiond_pid on SIGCHLD - */ - if (!sessiond_pid) { - exit(EXIT_FAILURE); - } - goto end; - } else { - perror("fork"); - ret = -1; - goto end; - } - -end: - return ret; -} - -/* - * check_sessiond - * - * Check if the session daemon is available using - * the liblttngctl API for the check. If not, try to - * spawn a daemon. - */ -static int check_sessiond(void) -{ - int ret; - char *pathname = NULL; - - ret = lttng_session_daemon_alive(); - if (ret == 0) { /* not alive */ - /* Try command line option path */ - pathname = opt_sessiond_path; - - /* Try LTTNG_SESSIOND_PATH env variable */ - if (pathname == NULL) { - pathname = getenv(DEFAULT_SESSIOND_PATH_ENV); - } - - /* Try with configured path */ - if (pathname == NULL) { - if (CONFIG_SESSIOND_BIN[0] != '\0') { - pathname = CONFIG_SESSIOND_BIN; - } - } - - /* Let's rock and roll while trying the default path */ - if (pathname == NULL) { - pathname = INSTALL_BIN_PATH "/lttng-sessiond"; - } - - DBG("Session daemon at: %s", pathname); - - /* Check existence and permissions */ - ret = access(pathname, F_OK | X_OK); - if (ret < 0) { - ERR("No such file or access denied: %s", pathname); - goto end; - } - - ret = spawn_sessiond(pathname); - if (ret < 0) { - ERR("Problem occurred when starting %s", pathname); - } - } -end: - return ret; -} - -/* - * Check args for specific options that *must* not trigger a session daemon - * execution. - * - * Return 1 if match else 0. - */ -static int check_args_no_sessiond(int argc, char **argv) -{ - int i; - - for (i = 0; i < argc; i++) { - if ((strncmp(argv[i], "-h", sizeof("-h")) == 0) || - strncmp(argv[i], "--h", sizeof("--h")) == 0 || - strncmp(argv[i], "--list-options", sizeof("--list-options")) == 0 || - strncmp(argv[i], "--list-commands", sizeof("--list-commands")) == 0 || - strncmp(argv[i], "version", sizeof("version")) == 0 || - strncmp(argv[i], "view", sizeof("view")) == 0) { - return 1; - } - } - - return 0; -} - /* * Parse command line arguments. * @@ -445,6 +316,11 @@ static int parse_args(int argc, char **argv) int opt, ret; char *user; + if (lttng_is_setuid_setgid()) { + ERR("'%s' is not allowed to be executed as a setuid/setgid binary for security reasons. Aborting.", argv[0]); + clean_exit(EXIT_FAILURE); + } + if (argc < 2) { usage(stderr); clean_exit(EXIT_FAILURE); @@ -516,13 +392,6 @@ static int parse_args(int argc, char **argv) lttng_opt_verbose = 0; } - /* Spawn session daemon if needed */ - if (opt_no_sessiond == 0 && check_args_no_sessiond(argc, argv) == 0 && - (check_sessiond() < 0)) { - ret = 1; - goto error; - } - /* No leftovers, print usage and quit */ if ((argc - optind) == 0) { usage(stderr); @@ -538,7 +407,7 @@ static int parse_args(int argc, char **argv) } /* Thanks Mathieu */ - /* + /* * Handle leftovers which is a first level command with the trailing * options. */