From: David Goulet Date: Thu, 8 Dec 2011 20:49:02 +0000 (-0500) Subject: Add non-root support for UST tracing X-Git-Tag: v2.0-pre15~14 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=67e407978a700da256ab4f58736002826c7be7c1;p=lttng-tools.git Add non-root support for UST tracing User-space tracing can now be used without root access meaning that the session daemon can run with the user credentials and trace his own applications. This adds the LTTNG_HOME_RUNDIR which is located, under non privileged user, in $HOME/.lttng. It contains all the control and consumers sockets. It is cleanup when lttng-sessiond dies. Signed-off-by: David Goulet --- diff --git a/include/lttng-consumerd.h b/include/lttng-consumerd.h index 1cd78571b..e42b2fea5 100644 --- a/include/lttng-consumerd.h +++ b/include/lttng-consumerd.h @@ -20,18 +20,20 @@ #ifndef _LTTNG_CONSUMERD_H #define _LTTNG_CONSUMERD_H +#define CONSUMERD_RUNDIR "%s" + /* Kernel consumer path */ -#define KCONSUMERD_PATH LTTNG_RUNDIR "/kconsumerd" +#define KCONSUMERD_PATH CONSUMERD_RUNDIR "/kconsumerd" #define KCONSUMERD_CMD_SOCK_PATH KCONSUMERD_PATH "/command" #define KCONSUMERD_ERR_SOCK_PATH KCONSUMERD_PATH "/error" /* UST 64-bit consumer path */ -#define USTCONSUMERD64_PATH LTTNG_RUNDIR "/ustconsumerd64" +#define USTCONSUMERD64_PATH CONSUMERD_RUNDIR "/ustconsumerd64" #define USTCONSUMERD64_CMD_SOCK_PATH USTCONSUMERD64_PATH "/command" #define USTCONSUMERD64_ERR_SOCK_PATH USTCONSUMERD64_PATH "/error" /* UST 32-bit consumer path */ -#define USTCONSUMERD32_PATH LTTNG_RUNDIR "/ustconsumerd32" +#define USTCONSUMERD32_PATH CONSUMERD_RUNDIR "/ustconsumerd32" #define USTCONSUMERD32_CMD_SOCK_PATH USTCONSUMERD32_PATH "/command" #define USTCONSUMERD32_ERR_SOCK_PATH USTCONSUMERD32_PATH "/error" diff --git a/include/lttng-sessiond-comm.h b/include/lttng-sessiond-comm.h index 3d31ff842..74d7dc99c 100644 --- a/include/lttng-sessiond-comm.h +++ b/include/lttng-sessiond-comm.h @@ -30,12 +30,13 @@ #include #define LTTNG_RUNDIR "/var/run/lttng" +#define LTTNG_HOME_RUNDIR "%s/.lttng" /* Default unix socket path */ #define DEFAULT_GLOBAL_CLIENT_UNIX_SOCK LTTNG_RUNDIR "/client-lttng-sessiond" #define DEFAULT_GLOBAL_APPS_UNIX_SOCK LTTNG_RUNDIR "/apps-lttng-sessiond" -#define DEFAULT_HOME_APPS_UNIX_SOCK "%s/.apps-lttng-sessiond" -#define DEFAULT_HOME_CLIENT_UNIX_SOCK "%s/.client-lttng-sessiond" +#define DEFAULT_HOME_APPS_UNIX_SOCK LTTNG_HOME_RUNDIR "/apps-lttng-sessiond" +#define DEFAULT_HOME_CLIENT_UNIX_SOCK LTTNG_HOME_RUNDIR "/client-lttng-sessiond" /* Queue size of listen(2) */ #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64 diff --git a/lttng-consumerd/lttng-consumerd.c b/lttng-consumerd/lttng-consumerd.c index dce188ace..cf515a9df 100644 --- a/lttng-consumerd/lttng-consumerd.c +++ b/lttng-consumerd/lttng-consumerd.c @@ -251,13 +251,16 @@ int main(int argc, char **argv) if (strlen(command_sock_path) == 0) { switch (opt_type) { case LTTNG_CONSUMER_KERNEL: - strcpy(command_sock_path, KCONSUMERD_CMD_SOCK_PATH); + snprintf(command_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH, + LTTNG_RUNDIR); break; case LTTNG_CONSUMER64_UST: - strcpy(command_sock_path, USTCONSUMERD64_CMD_SOCK_PATH); + snprintf(command_sock_path, PATH_MAX, + USTCONSUMERD64_CMD_SOCK_PATH, LTTNG_RUNDIR); break; case LTTNG_CONSUMER32_UST: - strcpy(command_sock_path, USTCONSUMERD32_CMD_SOCK_PATH); + snprintf(command_sock_path, PATH_MAX, + USTCONSUMERD32_CMD_SOCK_PATH, LTTNG_RUNDIR); break; default: WARN("Unknown consumerd type"); @@ -275,13 +278,16 @@ int main(int argc, char **argv) if (strlen(error_sock_path) == 0) { switch (opt_type) { case LTTNG_CONSUMER_KERNEL: - strcpy(error_sock_path, KCONSUMERD_ERR_SOCK_PATH); + snprintf(error_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH, + LTTNG_RUNDIR); break; case LTTNG_CONSUMER64_UST: - strcpy(error_sock_path, USTCONSUMERD64_ERR_SOCK_PATH); + snprintf(error_sock_path, PATH_MAX, + USTCONSUMERD64_ERR_SOCK_PATH, LTTNG_RUNDIR); break; case LTTNG_CONSUMER32_UST: - strcpy(error_sock_path, USTCONSUMERD32_ERR_SOCK_PATH); + snprintf(error_sock_path, PATH_MAX, + USTCONSUMERD32_ERR_SOCK_PATH, LTTNG_RUNDIR); break; default: WARN("Unknown consumerd type"); diff --git a/lttng-sessiond/main.c b/lttng-sessiond/main.c index ec45c6676..227f0c2f7 100644 --- a/lttng-sessiond/main.c +++ b/lttng-sessiond/main.c @@ -94,6 +94,7 @@ static int opt_sig_parent; static int opt_daemon; static int is_root; /* Set to 1 if the daemon is running as root */ static pid_t ppid; /* Parent PID for --sig-parent option */ +static char *rundir; /* Consumer daemon specific control data */ static struct consumer_data kconsumer_data = { @@ -423,19 +424,18 @@ static void cleanup(void) DBG("Cleaning up"); - if (is_root) { - DBG("Removing %s directory", LTTNG_RUNDIR); - ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); - if (ret < 0) { - ERR("asprintf failed. Something is really wrong!"); - } + DBG("Removing %s directory", rundir); + ret = asprintf(&cmd, "rm -rf %s", rundir); + if (ret < 0) { + ERR("asprintf failed. Something is really wrong!"); + } - /* Remove lttng run directory */ - ret = system(cmd); - if (ret < 0) { - ERR("Unable to clean " LTTNG_RUNDIR); - } + /* Remove lttng run directory */ + ret = system(cmd); + if (ret < 0) { + ERR("Unable to clean %s", rundir); } + free(cmd); DBG("Cleaning up all session"); @@ -3996,14 +3996,16 @@ static int create_apps_cmd_pipe(void) /* * Create the lttng run directory needed for all global sockets and pipe. */ -static int create_lttng_rundir(void) +static int create_lttng_rundir(const char *rundir) { int ret; - ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); + DBG3("Creating LTTng run directory: %s", rundir); + + ret = mkdir(rundir, S_IRWXU | S_IRWXG ); if (ret < 0) { if (errno != EEXIST) { - ERR("Unable to create " LTTNG_RUNDIR); + ERR("Unable to create %s", rundir); goto error; } else { ret = 0; @@ -4018,20 +4020,21 @@ error: * Setup sockets and directory needed by the kconsumerd communication with the * session daemon. */ -static int set_consumer_sockets(struct consumer_data *consumer_data) +static int set_consumer_sockets(struct consumer_data *consumer_data, + const char *rundir) { int ret; - const char *path; + char path[PATH_MAX]; - switch (consumer_data->type) { + switch (consumer_data->type) { case LTTNG_CONSUMER_KERNEL: - path = KCONSUMERD_PATH; + snprintf(path, PATH_MAX, KCONSUMERD_PATH, rundir); break; case LTTNG_CONSUMER64_UST: - path = USTCONSUMERD64_PATH; + snprintf(path, PATH_MAX, USTCONSUMERD64_PATH, rundir); break; case LTTNG_CONSUMER32_UST: - path = USTCONSUMERD32_PATH; + snprintf(path, PATH_MAX, USTCONSUMERD32_PATH, rundir); break; default: ERR("Consumer type unknown"); @@ -4039,6 +4042,8 @@ static int set_consumer_sockets(struct consumer_data *consumer_data) goto error; } + DBG2("Creating consumer directory: %s", path); + ret = mkdir(path, S_IRWXU | S_IRWXG); if (ret < 0) { if (errno != EEXIST) { @@ -4062,7 +4067,7 @@ static int set_consumer_sockets(struct consumer_data *consumer_data) S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); if (ret < 0) { ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); - perror("chmod"); + PERROR("chmod"); goto error; } @@ -4189,7 +4194,10 @@ int main(int argc, char **argv) is_root = !getuid(); if (is_root) { - ret = create_lttng_rundir(); + rundir = strdup(LTTNG_RUNDIR); + + /* Create global run dir with root access */ + ret = create_lttng_rundir(rundir); if (ret < 0) { goto error; } @@ -4209,6 +4217,17 @@ int main(int argc, char **argv) snprintf(wait_shm_path, PATH_MAX, DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); } + + /* Setup kernel consumerd path */ + snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, + KCONSUMERD_ERR_SOCK_PATH, rundir); + snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, + KCONSUMERD_CMD_SOCK_PATH, rundir); + + DBG2("Kernel consumer err path: %s", + kconsumer_data.err_unix_sock_path); + DBG2("Kernel consumer cmd path: %s", + kconsumer_data.cmd_unix_sock_path); } else { home_path = get_home_dir(); if (home_path == NULL) { @@ -4218,6 +4237,21 @@ int main(int argc, char **argv) goto error; } + /* + * Create rundir from home path. This will create something like + * $HOME/.lttng + */ + ret = asprintf(&rundir, LTTNG_HOME_RUNDIR, home_path); + if (ret < 0) { + ret = -ENOMEM; + goto error; + } + + ret = create_lttng_rundir(rundir); + if (ret < 0) { + goto error; + } + if (strlen(apps_unix_sock_path) == 0) { snprintf(apps_unix_sock_path, PATH_MAX, DEFAULT_HOME_APPS_UNIX_SOCK, home_path); @@ -4238,6 +4272,29 @@ int main(int argc, char **argv) DBG("Client socket path %s", client_unix_sock_path); DBG("Application socket path %s", apps_unix_sock_path); + DBG("LTTng run directory path: %s", rundir); + + /* 32 bits consumerd path setup */ + snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, + USTCONSUMERD32_ERR_SOCK_PATH, rundir); + snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, + USTCONSUMERD32_CMD_SOCK_PATH, rundir); + + DBG2("UST consumer 32 bits err path: %s", + ustconsumer32_data.err_unix_sock_path); + DBG2("UST consumer 32 bits cmd path: %s", + ustconsumer32_data.cmd_unix_sock_path); + + /* 64 bits consumerd path setup */ + snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, + USTCONSUMERD64_ERR_SOCK_PATH, rundir); + snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, + USTCONSUMERD64_CMD_SOCK_PATH, rundir); + + DBG2("UST consumer 64 bits err path: %s", + ustconsumer64_data.err_unix_sock_path); + DBG2("UST consumer 64 bits cmd path: %s", + ustconsumer64_data.cmd_unix_sock_path); /* * See if daemon already exist. @@ -4260,17 +4317,7 @@ int main(int argc, char **argv) * kernel tracer. */ if (is_root) { - ret = set_consumer_sockets(&kconsumer_data); - if (ret < 0) { - goto exit; - } - - ret = set_consumer_sockets(&ustconsumer64_data); - if (ret < 0) { - goto exit; - } - - ret = set_consumer_sockets(&ustconsumer32_data); + ret = set_consumer_sockets(&kconsumer_data, rundir); if (ret < 0) { goto exit; } @@ -4282,6 +4329,16 @@ int main(int argc, char **argv) set_ulimit(); } + ret = set_consumer_sockets(&ustconsumer64_data, rundir); + if (ret < 0) { + goto exit; + } + + ret = set_consumer_sockets(&ustconsumer32_data, rundir); + if (ret < 0) { + goto exit; + } + if ((ret = set_signal_handler()) < 0) { goto exit; } @@ -4415,8 +4472,9 @@ exit: cleanup(); rcu_thread_offline(); rcu_unregister_thread(); - if (!ret) + if (!ret) { exit(EXIT_SUCCESS); + } error: exit(EXIT_FAILURE); } diff --git a/lttng-sessiond/ust-app.c b/lttng-sessiond/ust-app.c index 2ed9d002d..377600f3d 100644 --- a/lttng-sessiond/ust-app.c +++ b/lttng-sessiond/ust-app.c @@ -1160,6 +1160,7 @@ static int create_ust_app_metadata(struct ust_app_session *ua_sess, char *pathname, struct ust_app *app) { int ret = 0; + mode_t old_umask; if (ua_sess->metadata == NULL) { /* Allocate UST metadata */ @@ -1185,11 +1186,13 @@ static int create_ust_app_metadata(struct ust_app_session *ua_sess, goto error; } + old_umask = umask(0); ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG); if (ret < 0) { PERROR("mkdir UST metadata"); goto error; } + umask(old_umask); ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/metadata", ua_sess->path);