Blob
Date:
Tue Mar 1 17:55:24 2022 UTC
Message:
declare uri as static; while here improve legibility of the length check too
/* $OpenBSD: control.c,v 1.4 2021/08/01 09:07:03 florian 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 "compat.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "control.h"
#include "minibuffer.h"
#include "telescope.h"
#include "utils.h"
#include "ui.h"
#define CONTROL_BACKLOG 5
struct {
struct event ev;
struct event evt;
int fd;
} control_state = {.fd = -1};
struct ctl_conn {
TAILQ_ENTRY(ctl_conn) entry;
struct imsgev iev;
};
struct ctl_conn *control_connbyfd(int);
struct ctl_conn *control_connbypid(pid_t);
void control_close(int);
TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns = TAILQ_HEAD_INITIALIZER(ctl_conns);
int
control_init(char *path)
{
struct sockaddr_un sun;
int fd;
mode_t old_umask;
if ((fd = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
0)) == -1) {
warn("%s: socket", __func__);
return (-1);
}
memset(&sun, 0, sizeof(sun));
sun.sun_family = AF_UNIX;
strlcpy(sun.sun_path, path, sizeof(sun.sun_path));
if (unlink(path) == -1)
if (errno != ENOENT) {
warn("%s: unlink %s", __func__, path);
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) {
warn("%s: bind: %s", __func__, path);
close(fd);
umask(old_umask);
return (-1);
}
umask(old_umask);
if (chmod(path, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP) == -1) {
warn("%s: chmod", __func__);
close(fd);
(void)unlink(path);
return (-1);
}
return (fd);
}
int
control_listen(int fd)
{
control_state.fd = fd;
if (listen(control_state.fd, CONTROL_BACKLOG) == -1) {
warn("%s: listen", __func__);
return (-1);
}
event_set(&control_state.ev, control_state.fd, EV_READ,
control_accept, NULL);
event_add(&control_state.ev, NULL);
evtimer_set(&control_state.evt, control_accept, NULL);
return (0);
}
void
control_accept(int listenfd, short event, void *bula)
{
int connfd;
socklen_t len;
struct sockaddr_un sun;
struct ctl_conn *c;
event_add(&control_state.ev, NULL);
if ((event & EV_TIMEOUT))
return;
len = sizeof(sun);
if ((connfd = accept4(listenfd, (struct sockaddr *)&sun, &len,
SOCK_CLOEXEC | SOCK_NONBLOCK)) == -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(&control_state.ev);
evtimer_add(&control_state.evt, &evtpause);
} else if (errno != EWOULDBLOCK && errno != EINTR &&
errno != ECONNABORTED)
message("%s: accept4: %s", __func__, strerror(errno));
return;
}
if ((c = calloc(1, sizeof(struct ctl_conn))) == NULL) {
message("%s: calloc: %s", __func__, strerror(errno));
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;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (c->iev.ibuf.fd == fd)
break;
}
return (c);
}
struct ctl_conn *
control_connbypid(pid_t pid)
{
struct ctl_conn *c;
TAILQ_FOREACH(c, &ctl_conns, entry) {
if (c->iev.ibuf.pid == pid)
break;
}
return (c);
}
void
control_close(int fd)
{
struct ctl_conn *c;
if ((c = control_connbyfd(fd)) == NULL) {
message("%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(&control_state.evt, NULL)) {
evtimer_del(&control_state.evt);
event_add(&control_state.ev, NULL);
}
free(c);
}
void
control_dispatch_imsg(int fd, short event, void *bula)
{
struct ctl_conn *c;
struct imsg imsg;
ssize_t n;
if ((c = control_connbyfd(fd)) == NULL) {
message("%s: fd %d: not found", __func__, fd);
return;
}
if (event & EV_READ) {
if (((n = imsg_read(&c->iev.ibuf)) == -1 && errno != EAGAIN) ||
n == 0) {
control_close(fd);
return;
}
}
if (event & EV_WRITE) {
if (msgbuf_write(&c->iev.ibuf.w) <= 0 && 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_OPEN_URL: {
static char uri[GEMINI_URL_LEN];
if (IMSG_DATA_SIZE(imsg) >= sizeof(uri))
break;
memset(uri, 0, sizeof(uri));
memcpy(uri, imsg.data, sizeof(uri));
if (uri[IMSG_DATA_SIZE(imsg)-1] != '\0')
break;
ui_remotely_open_link(uri);
break;
}
default:
message("%s: error handling imsg %d", __func__,
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_DATA_SIZE(*imsg)));
}
Omar Polo