commit 59ef79dd19611c7846b00427e6f2267c748ae290 from: Omar Polo date: Fri Feb 11 18:12:16 2022 UTC pull in control.c, with some local edits to integrate into the project commit - 7018345e07c0a8b71442b79572da308c75f7cd02 commit + 59ef79dd19611c7846b00427e6f2267c748ae290 blob - /dev/null blob + dd237f5f937a5f6cedda98d6050a81eee388f594 (mode 644) --- /dev/null +++ control.c @@ -0,0 +1,284 @@ +/* $OpenBSD: control.c,v 1.4 2021/08/01 09:07:03 florian 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 "compat.h" + +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include "control.h" +#include "minibuffer.h" +#include "session.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: { + char uri[GEMINI_URL_LEN] = { 0 }; + + if (IMSG_DATA_SIZE(imsg) > sizeof(uri)-1) + break; + memcpy(uri, imsg.data, sizeof(uri)); + if (uri[IMSG_DATA_SIZE(imsg)-1] != '\0') + break; + + new_tab(uri, NULL, NULL); + ui_on_tab_refresh(current_tab); + 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))); +} blob - /dev/null blob + 5ad6237eabf828acb8fd405cb743da353c800c69 (mode 644) --- /dev/null +++ include/control.h @@ -0,0 +1,25 @@ +/* $OpenBSD: control.h,v 1.1 2021/02/26 16:16:37 florian 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. + */ + +#ifndef SMALL +int control_init(char *); +int control_listen(int); +void control_accept(int, short, void *); +void control_dispatch_imsg(int, short, void *); +int control_imsg_relay(struct imsg *); +#endif /* SMALL */