diff options
Diffstat (limited to 'httpd/control.c')
| -rw-r--r-- | httpd/control.c | 334 |
1 files changed, 334 insertions, 0 deletions
diff --git a/httpd/control.c b/httpd/control.c new file mode 100644 index 0000000..fe60375 --- /dev/null +++ b/httpd/control.c @@ -0,0 +1,334 @@ +/* $OpenBSD: control.c,v 1.6 2015/01/21 22:21:05 reyk Exp $ */ + +/* + * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org> + * + * 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 <sys/queue.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <sys/time.h> +#include <sys/un.h> + +#include <errno.h> +#include <event.h> +#include <fcntl.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <imsg.h> + +#include "httpd.h" + +#define CONTROL_BACKLOG 5 + +struct ctl_connlist ctl_conns; + +void control_accept(int, short, void *); +void control_close(int, struct control_sock *); + +int +control_init(struct privsep *ps, struct control_sock *cs) +{ + struct httpd *env = ps->ps_env; + struct sockaddr_un sun; + int fd; + mode_t old_umask, mode; + + if (cs->cs_name == NULL) + return (0); + + if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) { + log_warn("%s: socket", __func__); + return (-1); + } + + sun.sun_family = AF_UNIX; + if (strlcpy(sun.sun_path, cs->cs_name, + sizeof(sun.sun_path)) >= sizeof(sun.sun_path)) { + log_warn("%s: %s name too long", __func__, cs->cs_name); + close(fd); + return (-1); + } + + if (unlink(cs->cs_name) == -1) + if (errno != ENOENT) { + log_warn("%s: unlink %s", __func__, cs->cs_name); + close(fd); + return (-1); + } + + if (cs->cs_restricted) { + old_umask = umask(S_IXUSR|S_IXGRP|S_IXOTH); + mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH; + } else { + old_umask = umask(S_IXUSR|S_IXGRP|S_IWOTH|S_IROTH|S_IXOTH); + mode = S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP; + } + + if (bind(fd, (struct sockaddr *)&sun, sizeof(sun)) == -1) { + log_warn("%s: bind: %s", __func__, cs->cs_name); + close(fd); + (void)umask(old_umask); + return (-1); + } + (void)umask(old_umask); + + if (chmod(cs->cs_name, mode) == -1) { + log_warn("%s: chmod", __func__); + close(fd); + (void)unlink(cs->cs_name); + return (-1); + } + + socket_set_blockmode(fd, BM_NONBLOCK); + cs->cs_fd = fd; + cs->cs_env = env; + + return (0); +} + +int +control_listen(struct control_sock *cs) +{ + if (cs->cs_name == NULL) + return (0); + + if (listen(cs->cs_fd, CONTROL_BACKLOG) == -1) { + log_warn("%s: listen", __func__); + return (-1); + } + + event_set(&cs->cs_ev, cs->cs_fd, EV_READ, + control_accept, cs); + event_add(&cs->cs_ev, NULL); + evtimer_set(&cs->cs_evt, control_accept, cs); + + return (0); +} + +void +control_cleanup(struct control_sock *cs) +{ + if (cs->cs_name == NULL) + return; + event_del(&cs->cs_ev); + event_del(&cs->cs_evt); + (void)unlink(cs->cs_name); +} + +/* ARGSUSED */ +void +control_accept(int listenfd, short event, void *arg) +{ + int connfd; + socklen_t len; + struct sockaddr_un sun; + struct ctl_conn *c; + struct control_sock *cs = arg; + + event_add(&cs->cs_ev, NULL); + if ((event & EV_TIMEOUT)) + return; + + 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) { + struct timeval evtpause = { 1, 0 }; + + event_del(&cs->cs_ev); + evtimer_add(&cs->cs_evt, &evtpause); + } else if (errno != EWOULDBLOCK && errno != EINTR && + errno != ECONNABORTED) + log_warn("%s: accept", __func__); + return; + } + + socket_set_blockmode(connfd, BM_NONBLOCK); + + if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) { + close(connfd); + log_warn("%s: calloc", __func__); + return; + } + + imsg_init(&c->iev.ibuf, connfd); + c->iev.handler = control_dispatch_imsg; + c->iev.events = EV_READ; + c->iev.data = cs; /* proc.c cheats (reuses the handler) */ + event_set(&c->iev.ev, c->iev.ibuf.fd, c->iev.events, + c->iev.handler, cs); + 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); +} + +void +control_close(int fd, struct control_sock *cs) +{ + struct ctl_conn *c; + + if ((c = control_connbyfd(fd)) == NULL) { + log_warn("%s: fd %d not found", __func__, fd); + return; + } + + msgbuf_clear(&c->iev.ibuf.w); + TAILQ_REMOVE(&ctl_conns, c, entry); + + event_del(&c->iev.ev); + close(c->iev.ibuf.fd); + + /* Some file descriptors are available again. */ + if (evtimer_pending(&cs->cs_evt, NULL)) { + evtimer_del(&cs->cs_evt); + event_add(&cs->cs_ev, NULL); + } + + free(c); +} + +/* ARGSUSED */ +void +control_dispatch_imsg(int fd, short event, void *arg) +{ + struct control_sock *cs = arg; + struct ctl_conn *c; + struct imsg imsg; + int n; + int verbose; + struct httpd *env = cs->cs_env; + + if ((c = control_connbyfd(fd)) == NULL) { + log_warn("%s: fd %d not found", __func__, fd); + return; + } + + if (event & EV_READ) { + if ((n = imsg_read(&c->iev.ibuf)) == -1 || n == 0) { + control_close(fd, cs); + return; + } + } + + if (event & EV_WRITE) { + if (msgbuf_write(&c->iev.ibuf.w) <= 0 && errno != EAGAIN) { + control_close(fd, cs); + return; + } + } + + for (;;) { + if ((n = imsg_get(&c->iev.ibuf, &imsg)) == -1) { + control_close(fd, cs); + return; + } + + if (n == 0) + break; + + if (c->waiting) { + log_debug("%s: unexpected imsg %d", + __func__, imsg.hdr.type); + imsg_free(&imsg); + control_close(fd, cs); + return; + } + + switch (imsg.hdr.type) { + case IMSG_CTL_SHUTDOWN: + case IMSG_CTL_RELOAD: + case IMSG_CTL_REOPEN: + proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1); + break; + case IMSG_CTL_NOTIFY: + if (c->flags & CTL_CONN_NOTIFY) { + log_debug("%s: " + "client requested notify more than once", + __func__); + imsg_compose_event(&c->iev, IMSG_CTL_FAIL, + 0, 0, -1, NULL, 0); + break; + } + c->flags |= CTL_CONN_NOTIFY; + break; + case IMSG_CTL_VERBOSE: + IMSG_SIZE_CHECK(&imsg, &verbose); + + memcpy(&verbose, imsg.data, sizeof(verbose)); + + proc_forward_imsg(env->sc_ps, &imsg, PROC_PARENT, -1); + proc_forward_imsg(env->sc_ps, &imsg, PROC_SERVER, -1); + + memcpy(imsg.data, &verbose, sizeof(verbose)); + control_imsg_forward(&imsg); + log_verbose(verbose); + break; + default: + log_debug("%s: error handling imsg %d", + __func__, imsg.hdr.type); + break; + } + imsg_free(&imsg); + } + + imsg_event_add(&c->iev); +} + +void +control_imsg_forward(struct imsg *imsg) +{ + struct ctl_conn *c; + + TAILQ_FOREACH(c, &ctl_conns, entry) + if (c->flags & CTL_CONN_NOTIFY) + imsg_compose_event(&c->iev, imsg->hdr.type, + 0, imsg->hdr.pid, -1, imsg->data, + imsg->hdr.len - IMSG_HEADER_SIZE); +} + +void +socket_set_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"); +} |