/* $OpenBSD: control.c,v 1.13 2013/11/26 11:59:38 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 "ldpd.h" #include "ldp.h" #include "ldpe.h" #include "log.h" #include "control.h" #define CONTROL_BACKLOG 5 struct ctl_conn *control_connbyfd(int); struct ctl_conn *control_connbypid(pid_t); void control_close(int); int control_fd; int control_init(void) { struct sockaddr_un sun; int fd; mode_t old_umask; if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { log_warn("control_init: socket"); return (-1); } bzero(&sun, sizeof(sun)); sun.sun_family = AF_UNIX; strlcpy(sun.sun_path, LDPD_SOCKET, sizeof(sun.sun_path)); if (unlink(LDPD_SOCKET) == -1) if (errno != ENOENT) { log_warn("control_init: unlink %s", LDPD_SOCKET); close(fd); return (-1); } old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { log_warn("control_init: bind: %s", LDPD_SOCKET); close(fd); umask(old_umask); return (-1); } umask(old_umask); if (chmod(LDPD_SOCKET, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) { log_warn("control_init: chmod"); close(fd); (void)unlink(LDPD_SOCKET); return (-1); } session_socket_blockmode(fd, BM_NONBLOCK); control_fd = fd; return (0); } int control_listen(void) { if (listen(control_fd, CONTROL_BACKLOG) == -1) { log_warn("control_listen: listen"); return (-1); } return (accept_add(control_fd, control_accept, NULL)); } void control_cleanup(void) { unlink(LDPD_SOCKET); } /* ARGSUSED */ void control_accept(int listenfd, short event, void *bula) { int connfd; socklen_t len; struct sockaddr_un sun; struct ctl_conn *c; len = sizeof(sun); if ((connfd = accept(listenfd, (struct sockaddr *)&sun, &len)) == -1) { /* * Pause accept if we are out of file descriptors, or * libevent will haunt us here too. */ if (errno == ENFILE || errno == EMFILE) accept_pause(); else if (errno != EWOULDBLOCK && errno != EINTR && errno != ECONNABORTED) log_warn("control_accept: accept"); return; } session_socket_blockmode(connfd, BM_NONBLOCK); if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { log_warn("control_accept"); close(connfd); return; } imsg_init(&c->iev.ibuf, connfd); c->iev.handler = control_dispatch_imsg; c->iev.events = EV_READ; event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, c->iev.handler, &c->iev); event_add(&c->iev.ev, NULL); TAILQ_INSERT_TAIL(&ctl_conns, c, entry); } struct ctl_conn * control_connbyfd(int fd) { struct ctl_conn *c; for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.fd != fd; c = TAILQ_NEXT(c, entry)) ; /* nothing */ return (c); } struct ctl_conn * control_connbypid(pid_t pid) { struct ctl_conn *c; for (c = TAILQ_FIRST(&ctl_conns); c != NULL && c->iev.ibuf.pid != pid; c = TAILQ_NEXT(c, entry)) ; /* nothing */ return (c); } void control_close(int fd) { struct ctl_conn *c; if ((c = control_connbyfd(fd)) == NULL) { log_warn("control_close: fd %d: not found", fd); return; } msgbuf_clear(&c->iev.ibuf.w); TAILQ_REMOVE(&ctl_conns, c, entry); event_del(&c->iev.ev); close(c->iev.ibuf.fd); free(c); accept_unpause(); } /* ARGSUSED */ void control_dispatch_imsg(int fd, short event, void *bula) { struct ctl_conn *c; struct imsg imsg; int n; unsigned int ifidx; int verbose; if ((c = control_connbyfd(fd)) == NULL) { log_warn("control_dispatch_imsg: fd %d: not found", fd); return; } if (event & EV_READ) { if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { control_close(fd); return; } } if (event & EV_WRITE) { if (msgbuf_write(&c->iev.ibuf.w) == -1 && errno != EAGAIN) { control_close(fd); return; } } for (;;) { if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { control_close(fd); return; } if (n == 0) break; switch (imsg.hdr.type) { case IMSG_CTL_FIB_COUPLE: case IMSG_CTL_FIB_DECOUPLE: case IMSG_CTL_RELOAD: c->iev.ibuf.pid = imsg.hdr.pid; ldpe_imsg_compose_parent(imsg.hdr.type, 0, NULL, 0); break; case IMSG_CTL_KROUTE: case IMSG_CTL_KROUTE_ADDR: case IMSG_CTL_IFINFO: c->iev.ibuf.pid = imsg.hdr.pid; ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); break; case IMSG_CTL_SHOW_INTERFACE: if (imsg.hdr.len == IMSG_HEADER_SIZE + sizeof(ifidx)) { memcpy(&ifidx, imsg.data, sizeof(ifidx)); ldpe_iface_ctl(c, ifidx); imsg_compose_event(&c->iev, IMSG_CTL_END, 0, 0, -1, NULL, 0); } break; case IMSG_CTL_SHOW_DISCOVERY: ldpe_adj_ctl(c); break; case IMSG_CTL_SHOW_LIB: c->iev.ibuf.pid = imsg.hdr.pid; ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); break; case IMSG_CTL_SHOW_NBR: ldpe_nbr_ctl(c); break; case IMSG_CTL_LOG_VERBOSE: if (imsg.hdr.len != IMSG_HEADER_SIZE + sizeof(verbose)) break; /* forward to other processes */ ldpe_imsg_compose_parent(imsg.hdr.type, imsg.hdr.pid, imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); ldpe_imsg_compose_lde(imsg.hdr.type, 0, imsg.hdr.pid, imsg.data, imsg.hdr.len - IMSG_HEADER_SIZE); memcpy(&verbose, imsg.data, sizeof(verbose)); log_verbose(verbose); break; default: log_debug("control_dispatch_imsg: " "error handling imsg %d", imsg.hdr.type); break; } imsg_free(&imsg); } imsg_event_add(&c->iev); } int control_imsg_relay(struct imsg *imsg) { struct ctl_conn *c; if ((c = control_connbypid(imsg->hdr.pid)) == NULL) return (0); return (imsg_compose_event(&c->iev, imsg->hdr.type, 0, imsg->hdr.pid, -1, imsg->data, imsg->hdr.len - IMSG_HEADER_SIZE)); } void session_socket_blockmode(int fd, enum blockmodes bm) { int flags; if ((flags = fcntl(fd, F_GETFL, 0)) == -1) fatal("fcntl F_GETFL"); if (bm == BM_NONBLOCK) flags |= O_NONBLOCK; else flags &= ~O_NONBLOCK; if ((flags = fcntl(fd, F_SETFL, flags)) == -1) fatal("fcntl F_SETFL"); }