| /* $OpenBSD$ */ |
| |
| /* |
| * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net> |
| * |
| * 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 MIND, 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/types.h> |
| #include <sys/ioctl.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/un.h> |
| #include <sys/wait.h> |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <pwd.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <syslog.h> |
| #include <unistd.h> |
| |
| #include "tmux.h" |
| |
| void client_send_environ(struct client_ctx *); |
| void client_handle_winch(struct client_ctx *); |
| |
| int |
| client_init(char *path, struct client_ctx *cctx, int cmdflags, int flags) |
| { |
| struct sockaddr_un sa; |
| struct stat sb; |
| struct msg_identify_data data; |
| struct winsize ws; |
| size_t size; |
| int fd, fd2, mode; |
| char *name, *term; |
| char rpathbuf[MAXPATHLEN]; |
| |
| if (realpath(path, rpathbuf) == NULL) |
| strlcpy(rpathbuf, path, sizeof rpathbuf); |
| setproctitle("client (%s)", rpathbuf); |
| |
| if (lstat(path, &sb) != 0) { |
| if (cmdflags & CMD_STARTSERVER && errno == ENOENT) { |
| if ((fd = server_start(path)) == -1) |
| goto start_failed; |
| goto server_started; |
| } |
| goto not_found; |
| } |
| if (!S_ISSOCK(sb.st_mode)) { |
| errno = ENOTSOCK; |
| goto not_found; |
| } |
| |
| memset(&sa, 0, sizeof sa); |
| sa.sun_family = AF_UNIX; |
| size = strlcpy(sa.sun_path, path, sizeof sa.sun_path); |
| if (size >= sizeof sa.sun_path) { |
| errno = ENAMETOOLONG; |
| goto not_found; |
| } |
| |
| if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) |
| fatal("socket failed"); |
| |
| if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) { |
| if (errno == ECONNREFUSED) { |
| if (unlink(path) != 0 || !(cmdflags & CMD_STARTSERVER)) |
| goto not_found; |
| if ((fd = server_start(path)) == -1) |
| goto start_failed; |
| goto server_started; |
| } |
| goto not_found; |
| } |
| |
| server_started: |
| if ((mode = fcntl(fd, F_GETFL)) == -1) |
| fatal("fcntl failed"); |
| if (fcntl(fd, F_SETFL, mode|O_NONBLOCK) == -1) |
| fatal("fcntl failed"); |
| imsg_init(&cctx->ibuf, fd); |
| |
| if (cmdflags & CMD_SENDENVIRON) |
| client_send_environ(cctx); |
| if (isatty(STDIN_FILENO)) { |
| if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) |
| fatal("ioctl(TIOCGWINSZ)"); |
| data.flags = flags; |
| data.sx = ws.ws_col; |
| data.sy = ws.ws_row; |
| |
| if (getcwd(data.cwd, sizeof data.cwd) == NULL) |
| *data.cwd = '\0'; |
| |
| *data.term = '\0'; |
| if ((term = getenv("TERM")) != NULL) { |
| if (strlcpy(data.term, |
| term, sizeof data.term) >= sizeof data.term) |
| *data.term = '\0'; |
| } |
| |
| *data.tty = '\0'; |
| if ((name = ttyname(STDIN_FILENO)) == NULL) |
| fatal("ttyname failed"); |
| if (strlcpy(data.tty, name, sizeof data.tty) >= sizeof data.tty) |
| fatalx("ttyname failed"); |
| |
| fd2 = dup(STDIN_FILENO); |
| imsg_compose(&cctx->ibuf, MSG_IDENTIFY, |
| PROTOCOL_VERSION, -1, fd2, &data, sizeof data); |
| } |
| |
| return (0); |
| |
| start_failed: |
| log_warnx("server failed to start"); |
| return (1); |
| |
| not_found: |
| log_warn("server not found"); |
| return (1); |
| } |
| |
| void |
| client_send_environ(struct client_ctx *cctx) |
| { |
| char **var; |
| struct msg_environ_data data; |
| |
| for (var = environ; *var != NULL; var++) { |
| if (strlcpy(data.var, *var, sizeof data.var) >= sizeof data.var) |
| continue; |
| client_write_server(cctx, MSG_ENVIRON, &data, sizeof data); |
| } |
| } |
| |
| int |
| client_main(struct client_ctx *cctx) |
| { |
| struct pollfd pfd; |
| int n, nfds; |
| |
| siginit(); |
| |
| logfile("client"); |
| |
| /* |
| * imsg_read in the first client poll loop (before the terminal has |
| * been initialiased) may have read messages into the buffer after the |
| * MSG_READY switched to here. Process anything outstanding now so poll |
| * doesn't hang waiting for messages that have already arrived. |
| */ |
| if (client_msg_dispatch(cctx) != 0) |
| goto out; |
| |
| for (;;) { |
| if (sigterm) |
| client_write_server(cctx, MSG_EXITING, NULL, 0); |
| if (sigchld) { |
| waitpid(WAIT_ANY, NULL, WNOHANG); |
| sigchld = 0; |
| } |
| if (sigwinch) |
| client_handle_winch(cctx); |
| if (sigcont) { |
| siginit(); |
| client_write_server(cctx, MSG_WAKEUP, NULL, 0); |
| sigcont = 0; |
| } |
| |
| pfd.fd = cctx->ibuf.fd; |
| pfd.events = POLLIN; |
| if (cctx->ibuf.w.queued > 0) |
| pfd.events |= POLLOUT; |
| |
| if ((nfds = poll(&pfd, 1, INFTIM)) == -1) { |
| if (errno == EAGAIN || errno == EINTR) |
| continue; |
| fatal("poll failed"); |
| } |
| if (nfds == 0) |
| continue; |
| |
| if (pfd.revents & (POLLERR|POLLHUP|POLLNVAL)) |
| fatalx("socket error"); |
| |
| if (pfd.revents & POLLIN) { |
| if ((n = imsg_read(&cctx->ibuf)) == -1 || n == 0) { |
| cctx->exittype = CCTX_DIED; |
| break; |
| } |
| if (client_msg_dispatch(cctx) != 0) |
| break; |
| } |
| |
| if (pfd.revents & POLLOUT) { |
| if (msgbuf_write(&cctx->ibuf.w) < 0) { |
| cctx->exittype = CCTX_DIED; |
| break; |
| } |
| } |
| } |
| |
| out: |
| if (sigterm) { |
| printf("[terminated]\n"); |
| return (1); |
| } |
| switch (cctx->exittype) { |
| case CCTX_DIED: |
| printf("[lost server]\n"); |
| return (0); |
| case CCTX_SHUTDOWN: |
| printf("[server exited]\n"); |
| return (0); |
| case CCTX_EXIT: |
| if (cctx->errstr != NULL) { |
| printf("[error: %s]\n", cctx->errstr); |
| return (1); |
| } |
| printf("[exited]\n"); |
| return (0); |
| case CCTX_DETACH: |
| printf("[detached]\n"); |
| return (0); |
| default: |
| printf("[unknown error]\n"); |
| return (1); |
| } |
| } |
| |
| void |
| client_handle_winch(struct client_ctx *cctx) |
| { |
| struct msg_resize_data data; |
| struct winsize ws; |
| |
| if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) |
| fatal("ioctl failed"); |
| |
| data.sx = ws.ws_col; |
| data.sy = ws.ws_row; |
| client_write_server(cctx, MSG_RESIZE, &data, sizeof data); |
| |
| sigwinch = 0; |
| } |
| |
| int |
| client_msg_dispatch(struct client_ctx *cctx) |
| { |
| struct imsg imsg; |
| struct msg_print_data printdata; |
| ssize_t n, datalen; |
| |
| for (;;) { |
| if ((n = imsg_get(&cctx->ibuf, &imsg)) == -1) |
| fatalx("imsg_get failed"); |
| if (n == 0) |
| return (0); |
| datalen = imsg.hdr.len - IMSG_HEADER_SIZE; |
| |
| switch (imsg.hdr.type) { |
| case MSG_DETACH: |
| if (datalen != 0) |
| fatalx("bad MSG_DETACH size"); |
| |
| client_write_server(cctx, MSG_EXITING, NULL, 0); |
| cctx->exittype = CCTX_DETACH; |
| break; |
| case MSG_ERROR: |
| if (datalen != sizeof printdata) |
| fatalx("bad MSG_ERROR size"); |
| memcpy(&printdata, imsg.data, sizeof printdata); |
| |
| printdata.msg[(sizeof printdata.msg) - 1] = '\0'; |
| /* Error string used after exit message from server. */ |
| cctx->errstr = xstrdup(printdata.msg); |
| imsg_free(&imsg); |
| return (-1); |
| case MSG_EXIT: |
| if (datalen != 0) |
| fatalx("bad MSG_EXIT size"); |
| |
| client_write_server(cctx, MSG_EXITING, NULL, 0); |
| cctx->exittype = CCTX_EXIT; |
| break; |
| case MSG_EXITED: |
| if (datalen != 0) |
| fatalx("bad MSG_EXITED size"); |
| |
| imsg_free(&imsg); |
| return (-1); |
| case MSG_SHUTDOWN: |
| if (datalen != 0) |
| fatalx("bad MSG_SHUTDOWN size"); |
| |
| client_write_server(cctx, MSG_EXITING, NULL, 0); |
| cctx->exittype = CCTX_SHUTDOWN; |
| break; |
| case MSG_SUSPEND: |
| if (datalen != 0) |
| fatalx("bad MSG_SUSPEND size"); |
| |
| client_suspend(); |
| break; |
| default: |
| fatalx("unexpected message"); |
| } |
| |
| imsg_free(&imsg); |
| } |
| } |