/* $OpenBSD: bgpd.c,v 1.116 2005/03/30 11:23:15 henning Exp $ */ /* * Copyright (c) 2003, 2004 Henning Brauer * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mrt.h" #include "bgpd.h" #include "session.h" void sighdlr(int); __dead void usage(void); int main(int, char *[]); int check_child(pid_t, const char *); int send_filterset(struct imsgbuf *, struct filter_set_head *, int, int); int reconfigure(char *, struct bgpd_config *, struct mrt_head *, struct peer **, struct filter_head *); int dispatch_imsg(struct imsgbuf *, int); int rfd = -1; volatile sig_atomic_t mrtdump = 0; volatile sig_atomic_t quit = 0; volatile sig_atomic_t reconfig = 0; volatile sig_atomic_t sigchld = 0; struct imsgbuf *ibuf_se; struct imsgbuf *ibuf_rde; void sighdlr(int sig) { switch (sig) { case SIGTERM: case SIGINT: quit = 1; break; case SIGCHLD: sigchld = 1; break; case SIGHUP: reconfig = 1; break; case SIGALRM: case SIGUSR1: mrtdump = 1; break; } } __dead void usage(void) { extern char *__progname; fprintf(stderr, "usage: %s [-dnv] ", __progname); fprintf(stderr, "[-D macro=value] [-f file]\n"); exit(1); } #define PFD_PIPE_SESSION 0 #define PFD_PIPE_ROUTE 1 #define PFD_SOCK_ROUTE 2 #define POLL_MAX 3 #define MAX_TIMEOUT 3600 int main(int argc, char *argv[]) { struct bgpd_config conf; struct peer *peer_l, *p; struct mrt_head mrt_l; struct network_head net_l; struct filter_head *rules_l; struct network *net; struct filter_rule *r; struct mrt *m; struct listen_addr *la; struct pollfd pfd[POLL_MAX]; pid_t io_pid = 0, rde_pid = 0, pid; char *conffile; int debug = 0; int ch, nfds, timeout; int pipe_m2s[2]; int pipe_m2r[2]; int pipe_s2r[2]; conffile = CONFFILE; bgpd_process = PROC_MAIN; log_init(1); /* log to stderr until daemonized */ if ((rules_l = calloc(1, sizeof(struct filter_head))) == NULL) err(1, NULL); bzero(&conf, sizeof(conf)); LIST_INIT(&mrt_l); TAILQ_INIT(&net_l); TAILQ_INIT(rules_l); peer_l = NULL; while ((ch = getopt(argc, argv, "dD:f:nv")) != -1) { switch (ch) { case 'd': debug = 1; break; case 'D': if (cmdline_symset(optarg) < 0) log_warnx("could not parse macro definition %s", optarg); break; case 'f': conffile = optarg; break; case 'n': conf.opts |= BGPD_OPT_NOACTION; break; case 'v': if (conf.opts & BGPD_OPT_VERBOSE) conf.opts |= BGPD_OPT_VERBOSE2; conf.opts |= BGPD_OPT_VERBOSE; break; default: usage(); /* NOTREACHED */ } } if (parse_config(conffile, &conf, &mrt_l, &peer_l, &net_l, rules_l)) { free(rules_l); exit(1); } if (conf.opts & BGPD_OPT_NOACTION) { if (conf.opts & BGPD_OPT_VERBOSE) print_config(&conf, &net_l, peer_l, rules_l, &mrt_l); else fprintf(stderr, "configuration OK\n"); exit(0); } if (geteuid()) errx(1, "need root privileges"); if (getpwnam(BGPD_USER) == NULL) errx(1, "unknown user %s", BGPD_USER); endpwent(); log_init(debug); if (!debug) daemon(1, 0); log_info("startup"); if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_m2s) == -1) fatal("socketpair"); if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_m2r) == -1) fatal("socketpair"); if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_s2r) == -1) fatal("socketpair"); session_socket_blockmode(pipe_m2s[0], BM_NONBLOCK); session_socket_blockmode(pipe_m2s[1], BM_NONBLOCK); session_socket_blockmode(pipe_m2r[0], BM_NONBLOCK); session_socket_blockmode(pipe_m2r[1], BM_NONBLOCK); session_socket_blockmode(pipe_s2r[0], BM_NONBLOCK); session_socket_blockmode(pipe_s2r[1], BM_NONBLOCK); prepare_listeners(&conf); /* fork children */ rde_pid = rde_main(&conf, peer_l, &net_l, rules_l, &mrt_l, pipe_m2r, pipe_s2r, pipe_m2s); io_pid = session_main(&conf, peer_l, &net_l, rules_l, &mrt_l, pipe_m2s, pipe_s2r, pipe_m2r); setproctitle("parent"); signal(SIGTERM, sighdlr); signal(SIGINT, sighdlr); signal(SIGCHLD, sighdlr); signal(SIGHUP, sighdlr); signal(SIGALRM, sighdlr); signal(SIGUSR1, sighdlr); close(pipe_m2s[1]); close(pipe_m2r[1]); close(pipe_s2r[0]); close(pipe_s2r[1]); if ((ibuf_se = malloc(sizeof(struct imsgbuf))) == NULL || (ibuf_rde = malloc(sizeof(struct imsgbuf))) == NULL) fatal(NULL); imsg_init(ibuf_se, pipe_m2s[0]); imsg_init(ibuf_rde, pipe_m2r[0]); mrt_init(ibuf_rde, ibuf_se); if ((rfd = kr_init(!(conf.flags & BGPD_FLAG_NO_FIB_UPDATE))) == -1) quit = 1; if (pftable_clear_all() != 0) quit = 1; while ((net = TAILQ_FIRST(&net_l)) != NULL) { TAILQ_REMOVE(&net_l, net, entry); free(net); } while ((r = TAILQ_FIRST(rules_l)) != NULL) { TAILQ_REMOVE(rules_l, r, entry); free(r); } TAILQ_FOREACH(la, conf.listen_addrs, entry) { close(la->fd); la->fd = -1; } mrt_reconfigure(&mrt_l); while (quit == 0) { pfd[PFD_PIPE_SESSION].fd = ibuf_se->fd; pfd[PFD_PIPE_SESSION].events = POLLIN; if (ibuf_se->w.queued) pfd[PFD_PIPE_SESSION].events |= POLLOUT; pfd[PFD_PIPE_ROUTE].fd = ibuf_rde->fd; pfd[PFD_PIPE_ROUTE].events = POLLIN; if (ibuf_rde->w.queued) pfd[PFD_PIPE_ROUTE].events |= POLLOUT; pfd[PFD_SOCK_ROUTE].fd = rfd; pfd[PFD_SOCK_ROUTE].events = POLLIN; timeout = mrt_timeout(&mrt_l); if (timeout > MAX_TIMEOUT) timeout = MAX_TIMEOUT; if ((nfds = poll(pfd, POLL_MAX, timeout * 1000)) == -1) if (errno != EINTR) { log_warn("poll error"); quit = 1; } if (nfds > 0 && (pfd[PFD_PIPE_SESSION].revents & POLLOUT)) if (msgbuf_write(&ibuf_se->w) < 0) { log_warn("pipe write error (to SE)"); quit = 1; } if (nfds > 0 && (pfd[PFD_PIPE_ROUTE].revents & POLLOUT)) if (msgbuf_write(&ibuf_rde->w) < 0) { log_warn("pipe write error (to RDE)"); quit = 1; } if (nfds > 0 && pfd[PFD_PIPE_SESSION].revents & POLLIN) { nfds--; if (dispatch_imsg(ibuf_se, PFD_PIPE_SESSION) == -1) quit = 1; } if (nfds > 0 && pfd[PFD_PIPE_ROUTE].revents & POLLIN) { nfds--; if (dispatch_imsg(ibuf_rde, PFD_PIPE_ROUTE) == -1) quit = 1; } if (nfds > 0 && pfd[PFD_SOCK_ROUTE].revents & POLLIN) { nfds--; if (kr_dispatch_msg() == -1) quit = 1; } if (reconfig) { reconfig = 0; log_info("rereading config"); reconfigure(conffile, &conf, &mrt_l, &peer_l, rules_l); } if (sigchld) { sigchld = 0; if (check_child(io_pid, "session engine")) { quit = 1; io_pid = 0; } if (check_child(rde_pid, "route decision engine")) { quit = 1; rde_pid = 0; } } if (mrtdump == 1) { mrtdump = 0; mrt_handler(&mrt_l); } } signal(SIGCHLD, SIG_IGN); if (io_pid) kill(io_pid, SIGTERM); if (rde_pid) kill(rde_pid, SIGTERM); while ((p = peer_l) != NULL) { peer_l = p->next; free(p); } while ((m = LIST_FIRST(&mrt_l)) != NULL) { LIST_REMOVE(m, entry); free(m); } while ((la = TAILQ_FIRST(conf.listen_addrs)) != NULL) { TAILQ_REMOVE(conf.listen_addrs, la, entry); close(la->fd); free(la); } free(rules_l); control_cleanup(); kr_shutdown(); pftable_clear_all(); free(conf.listen_addrs); do { if ((pid = wait(NULL)) == -1 && errno != EINTR && errno != ECHILD) fatal("wait"); } while (pid != -1 || (pid == -1 && errno == EINTR)); msgbuf_clear(&ibuf_se->w); free(ibuf_se); msgbuf_clear(&ibuf_rde->w); free(ibuf_rde); log_info("Terminating"); return (0); } int check_child(pid_t pid, const char *pname) { int status; if (waitpid(pid, &status, WNOHANG) > 0) { if (WIFEXITED(status)) { log_warnx("Lost child: %s exited", pname); return (1); } if (WIFSIGNALED(status)) { log_warnx("Lost child: %s terminated; signal %d", pname, WTERMSIG(status)); return (1); } } return (0); } int send_filterset(struct imsgbuf *i, struct filter_set_head *set, int id, int f) { struct filter_set *s; for (s = SIMPLEQ_FIRST(set); s != NULL; ) { if (imsg_compose(i, IMSG_FILTER_SET, id, 0, -1, s, sizeof(struct filter_set)) == -1) return (-1); if (f) { SIMPLEQ_REMOVE_HEAD(set, entry); free(s); s = SIMPLEQ_FIRST(set); } else s = SIMPLEQ_NEXT(s, entry); } return (0); } int reconfigure(char *conffile, struct bgpd_config *conf, struct mrt_head *mrt_l, struct peer **peer_l, struct filter_head *rules_l) { struct network_head net_l; struct network *n; struct peer *p; struct filter_rule *r; struct listen_addr *la; if (parse_config(conffile, conf, mrt_l, peer_l, &net_l, rules_l)) { log_warnx("config file %s has errors, not reloading", conffile); return (-1); } prepare_listeners(conf); if (imsg_compose(ibuf_se, IMSG_RECONF_CONF, 0, 0, -1, conf, sizeof(struct bgpd_config)) == -1) return (-1); if (imsg_compose(ibuf_rde, IMSG_RECONF_CONF, 0, 0, -1, conf, sizeof(struct bgpd_config)) == -1) return (-1); for (p = *peer_l; p != NULL; p = p->next) { if (imsg_compose(ibuf_se, IMSG_RECONF_PEER, p->conf.id, 0, -1, &p->conf, sizeof(struct peer_config)) == -1) return (-1); if (send_filterset(ibuf_se, &p->conf.attrset, p->conf.id, 0) == -1) return (-1); } while ((n = TAILQ_FIRST(&net_l)) != NULL) { if (imsg_compose(ibuf_rde, IMSG_NETWORK_ADD, 0, 0, -1, &n->net, sizeof(struct network_config)) == -1) return (-1); if (send_filterset(ibuf_rde, &n->net.attrset, 0, 1) == -1) return (-1); if (imsg_compose(ibuf_rde, IMSG_NETWORK_DONE, 0, 0, -1, NULL, 0) == -1) return (-1); TAILQ_REMOVE(&net_l, n, entry); free(n); } while ((r = TAILQ_FIRST(rules_l)) != NULL) { if (imsg_compose(ibuf_rde, IMSG_RECONF_FILTER, 0, 0, -1, r, sizeof(struct filter_rule)) == -1) return (-1); if (send_filterset(ibuf_rde, &r->set, 0, 1) == -1) return (-1); TAILQ_REMOVE(rules_l, r, entry); free(r); } TAILQ_FOREACH(la, conf->listen_addrs, entry) { if (imsg_compose(ibuf_se, IMSG_RECONF_LISTENER, 0, 0, la->fd, la, sizeof(struct listen_addr)) == -1) return (-1); la->fd = -1; } if (imsg_compose(ibuf_se, IMSG_RECONF_DONE, 0, 0, -1, NULL, 0) == -1 || imsg_compose(ibuf_rde, IMSG_RECONF_DONE, 0, 0, -1, NULL, 0) == -1) return (-1); /* mrt changes can be sent out of bound */ mrt_reconfigure(mrt_l); return (0); } int dispatch_imsg(struct imsgbuf *ibuf, int idx) { struct imsg imsg; int n; int rv; if ((n = imsg_read(ibuf)) == -1) return (-1); if (n == 0) { /* connection closed */ log_warnx("dispatch_imsg in main: pipe closed"); return (-1); } rv = 0; for (;;) { if ((n = imsg_get(ibuf, &imsg)) == -1) return (-1); if (n == 0) break; switch (imsg.hdr.type) { case IMSG_KROUTE_CHANGE: if (idx != PFD_PIPE_ROUTE) log_warnx("route request not from RDE"); else if (kr_change(imsg.data)) rv = -1; break; case IMSG_KROUTE_DELETE: if (idx != PFD_PIPE_ROUTE) log_warnx("route request not from RDE"); else if (kr_delete(imsg.data)) rv = -1; break; case IMSG_NEXTHOP_ADD: if (idx != PFD_PIPE_ROUTE) log_warnx("nexthop request not from RDE"); else if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(struct bgpd_addr)) log_warnx("wrong imsg len"); else if (kr_nexthop_add(imsg.data) == -1) rv = -1; break; case IMSG_NEXTHOP_REMOVE: if (idx != PFD_PIPE_ROUTE) log_warnx("nexthop request not from RDE"); else if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(struct bgpd_addr)) log_warnx("wrong imsg len"); else kr_nexthop_delete(imsg.data); break; case IMSG_PFTABLE_ADD: if (idx != PFD_PIPE_ROUTE) log_warnx("pftable request not from RDE"); else if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(struct pftable_msg)) log_warnx("wrong imsg len"); else if (pftable_addr_add(imsg.data) != 0) rv = -1; break; case IMSG_PFTABLE_REMOVE: if (idx != PFD_PIPE_ROUTE) log_warnx("pftable request not from RDE"); else if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(struct pftable_msg)) log_warnx("wrong imsg len"); else if (pftable_addr_remove(imsg.data) != 0) rv = -1; break; case IMSG_PFTABLE_COMMIT: if (idx != PFD_PIPE_ROUTE) log_warnx("pftable request not from RDE"); else if (imsg.hdr.len != IMSG_HEADER_SIZE) log_warnx("wrong imsg len"); else if (pftable_commit() != 0) rv = -1; break; case IMSG_CTL_RELOAD: if (idx != PFD_PIPE_SESSION) log_warnx("reload request not from SE"); else reconfig = 1; break; case IMSG_CTL_FIB_COUPLE: if (idx != PFD_PIPE_SESSION) log_warnx("couple request not from SE"); else kr_fib_couple(); break; case IMSG_CTL_FIB_DECOUPLE: if (idx != PFD_PIPE_SESSION) log_warnx("decouple request not from SE"); else kr_fib_decouple(); break; case IMSG_CTL_KROUTE: case IMSG_CTL_KROUTE_ADDR: case IMSG_CTL_SHOW_NEXTHOP: case IMSG_CTL_SHOW_INTERFACE: if (idx != PFD_PIPE_SESSION) log_warnx("kroute request not from SE"); else kr_show_route(&imsg); break; case IMSG_IFINFO: if (idx != PFD_PIPE_SESSION) log_warnx("IFINFO request not from SE"); else if (imsg.hdr.len != IMSG_HEADER_SIZE + IFNAMSIZ) log_warnx("IFINFO request with wrong len"); else kr_ifinfo(imsg.data); break; default: break; } imsg_free(&imsg); if (rv != 0) return (rv); } return (0); } void send_nexthop_update(struct kroute_nexthop *msg) { char *gw = NULL; if (msg->gateway.af) if (asprintf(&gw, ": via %s", log_addr(&msg->gateway)) == -1) { log_warn("send_nexthop_update"); quit = 1; } log_info("nexthop %s now %s%s%s", log_addr(&msg->nexthop), msg->valid ? "valid" : "invalid", msg->connected ? ": directly connected" : "", msg->gateway.af ? gw : ""); free(gw); if (imsg_compose(ibuf_rde, IMSG_NEXTHOP_UPDATE, 0, 0, -1, msg, sizeof(struct kroute_nexthop)) == -1) quit = 1; } void send_imsg_session(int type, pid_t pid, void *data, u_int16_t datalen) { imsg_compose(ibuf_se, type, 0, pid, -1, data, datalen); }