static void lka_sig_handler(int sig, short event, void *p) { int status; pid_t pid; switch (sig) { case SIGINT: case SIGTERM: lka_shutdown(); break; case SIGCHLD: do { pid = waitpid(-1, &status, WNOHANG); } while (pid > 0 || (pid == -1 && errno == EINTR)); break; default: fatalx("lka_sig_handler: unexpected signal"); } }
pid_t lka(void) { pid_t pid; struct passwd *pw; struct event ev_sigint; struct event ev_sigterm; struct event ev_sigchld; switch (pid = fork()) { case -1: fatal("lka: cannot fork"); case 0: break; default: return (pid); } purge_config(PURGE_EVERYTHING); if ((pw = getpwnam(SMTPD_USER)) == NULL) fatalx("unknown user " SMTPD_USER); config_process(PROC_LKA); if (setgroups(1, &pw->pw_gid) || setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) fatal("lka: cannot drop privileges"); imsg_callback = lka_imsg; event_init(); signal_set(&ev_sigint, SIGINT, lka_sig_handler, NULL); signal_set(&ev_sigterm, SIGTERM, lka_sig_handler, NULL); signal_set(&ev_sigchld, SIGCHLD, lka_sig_handler, NULL); signal_add(&ev_sigint, NULL); signal_add(&ev_sigterm, NULL); signal_add(&ev_sigchld, NULL); signal(SIGPIPE, SIG_IGN); signal(SIGHUP, SIG_IGN); /* * lka opens all kinds of files and sockets, so bump the limit to max. * XXX: need to analyse the exact hard limit. */ fdlimit(1.0); config_peer(PROC_PARENT); config_peer(PROC_QUEUE); config_peer(PROC_SMTP); config_peer(PROC_MDA); config_peer(PROC_MTA); config_peer(PROC_CONTROL); config_done(); /* Ignore them until we get our config */ mproc_disable(p_mda); mproc_disable(p_mta); mproc_disable(p_smtp); if (event_dispatch() < 0) fatal("event_dispatch"); lka_shutdown(); return (0); }
pid_t lka(void) { pid_t pid; struct passwd *pw; struct event ev_sigint; struct event ev_sigterm; struct event ev_sigchld; struct peer peers[] = { { PROC_PARENT, imsg_dispatch }, { PROC_MFA, imsg_dispatch }, { PROC_QUEUE, imsg_dispatch }, { PROC_SMTP, imsg_dispatch }, { PROC_MTA, imsg_dispatch }, { PROC_CONTROL, imsg_dispatch } }; switch (pid = fork()) { case -1: fatal("lka: cannot fork"); case 0: break; default: return (pid); } purge_config(PURGE_EVERYTHING); pw = env->sc_pw; smtpd_process = PROC_LKA; setproctitle("%s", env->sc_title[smtpd_process]); if (setgroups(1, &pw->pw_gid) || setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) || setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid)) fatal("lka: cannot drop privileges"); imsg_callback = lka_imsg; event_init(); SPLAY_INIT(&env->lka_sessions); signal_set(&ev_sigint, SIGINT, lka_sig_handler, NULL); signal_set(&ev_sigterm, SIGTERM, lka_sig_handler, NULL); signal_set(&ev_sigchld, SIGCHLD, lka_sig_handler, NULL); signal_add(&ev_sigint, NULL); signal_add(&ev_sigterm, NULL); signal_add(&ev_sigchld, NULL); signal(SIGPIPE, SIG_IGN); signal(SIGHUP, SIG_IGN); /* * lka opens all kinds of files and sockets, so bump the limit to max. * XXX: need to analyse the exact hard limit. */ fdlimit(1.0); config_pipes(peers, nitems(peers)); config_peers(peers, nitems(peers)); /* ignore them until we get our config */ event_del(&env->sc_ievs[PROC_MTA]->ev); event_del(&env->sc_ievs[PROC_MFA]->ev); event_del(&env->sc_ievs[PROC_SMTP]->ev); if (event_dispatch() < 0) fatal("event_dispatch"); lka_shutdown(); return (0); }