/*
* Set sessiond socket path by putting it in the global sessiond_sock_path
* variable.
*
* Returns 0 on success, negative value on failure (the sessiond socket path
* is somehow too long or ENOMEM).
*/
static int set_session_daemon_path(void)
{
int in_tgroup = 0; /* In tracing group */
uid_t uid;
uid = getuid();
if (uid != 0) {
/* Are we in the tracing group ? */
in_tgroup = check_tracing_group(tracing_group);
}
if ((uid == 0) || in_tgroup) {
copy_string(sessiond_sock_path, DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
sizeof(sessiond_sock_path));
}
if (uid != 0) {
int ret;
if (in_tgroup) {
/* Tracing group */
ret = try_connect_sessiond(sessiond_sock_path);
if (ret >= 0) {
goto end;
}
/* Global session daemon not available... */
}
/* ...or not in tracing group (and not root), default */
/*
* With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
* With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
*/
ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
DEFAULT_HOME_CLIENT_UNIX_SOCK, getenv("HOME"));
if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
goto error;
}
}
end:
return 0;
error:
return -1;
}
/*
* Set health socket path by putting it in the global health_sock_path
* variable.
*
* Returns 0 on success or assert(0) on ENOMEM.
*/
static int set_health_socket_path(void)
{
int in_tgroup = 0; /* In tracing group */
uid_t uid;
const char *home;
uid = getuid();
if (uid != 0) {
/* Are we in the tracing group ? */
in_tgroup = check_tracing_group(tracing_group);
}
if ((uid == 0) || in_tgroup) {
copy_string(health_sock_path, DEFAULT_GLOBAL_HEALTH_UNIX_SOCK,
sizeof(health_sock_path));
}
if (uid != 0) {
int ret;
/*
* With GNU C < 2.1, snprintf returns -1 if the target buffer is too small;
* With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
*/
home = getenv("HOME");
if (home == NULL) {
/* Fallback in /tmp .. */
home = "/tmp";
}
ret = snprintf(health_sock_path, sizeof(health_sock_path),
DEFAULT_HOME_HEALTH_UNIX_SOCK, home);
if ((ret < 0) || (ret >= sizeof(health_sock_path))) {
/* ENOMEM at this point... just kill the control lib. */
assert(0);
}
}
return 0;
}
static
int check_requirements(int *sudo)
{
int ret;
ret = check_or_start_sessiond();
if (ret < 0)
goto end;
ret = check_or_start_relayd();
if (ret < 0)
goto end;
ret = check_tracing_group();
if (ret < 0)
goto end;
else if (ret == 1)
*sudo = 1;
ret = check_lttng_modules(*sudo);
if (ret < 0)
goto end;
end:
return ret;
}
