1 /* $OpenBSD$ */ 2 3 /* 4 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER 15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/socket.h> 21 22 #include <errno.h> 23 #include <fcntl.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <time.h> 27 #include <unistd.h> 28 29 #include "tmux.h" 30 31 /* 32 * Open pipe to redirect pane output. If already open, close first. 33 */ 34 35 enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmd_q *); 36 37 void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *); 38 39 const struct cmd_entry cmd_pipe_pane_entry = { 40 .name = "pipe-pane", 41 .alias = "pipep", 42 43 .args = { "ot:", 0, 1 }, 44 .usage = "[-o] " CMD_TARGET_PANE_USAGE " [command]", 45 46 .tflag = CMD_PANE, 47 48 .flags = 0, 49 .exec = cmd_pipe_pane_exec 50 }; 51 52 enum cmd_retval 53 cmd_pipe_pane_exec(struct cmd *self, struct cmd_q *cmdq) 54 { 55 struct args *args = self->args; 56 struct client *c = cmdq->state.c; 57 struct window_pane *wp = cmdq->state.tflag.wp; 58 struct session *s = cmdq->state.tflag.s; 59 struct winlink *wl = cmdq->state.tflag.wl; 60 char *cmd; 61 int old_fd, pipe_fd[2], null_fd; 62 struct format_tree *ft; 63 64 /* Destroy the old pipe. */ 65 old_fd = wp->pipe_fd; 66 if (wp->pipe_fd != -1) { 67 bufferevent_free(wp->pipe_event); 68 close(wp->pipe_fd); 69 wp->pipe_fd = -1; 70 } 71 72 /* If no pipe command, that is enough. */ 73 if (args->argc == 0 || *args->argv[0] == '\0') 74 return (CMD_RETURN_NORMAL); 75 76 /* 77 * With -o, only open the new pipe if there was no previous one. This 78 * allows a pipe to be toggled with a single key, for example: 79 * 80 * bind ^p pipep -o 'cat >>~/output' 81 */ 82 if (args_has(self->args, 'o') && old_fd != -1) 83 return (CMD_RETURN_NORMAL); 84 85 /* Open the new pipe. */ 86 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) { 87 cmdq_error(cmdq, "socketpair error: %s", strerror(errno)); 88 return (CMD_RETURN_ERROR); 89 } 90 91 /* Expand the command. */ 92 ft = format_create(cmdq, 0); 93 format_defaults(ft, c, s, wl, wp); 94 cmd = format_expand_time(ft, args->argv[0], time(NULL)); 95 format_free(ft); 96 97 /* Fork the child. */ 98 switch (fork()) { 99 case -1: 100 cmdq_error(cmdq, "fork error: %s", strerror(errno)); 101 102 free(cmd); 103 return (CMD_RETURN_ERROR); 104 case 0: 105 /* Child process. */ 106 close(pipe_fd[0]); 107 clear_signals(1); 108 109 if (dup2(pipe_fd[1], STDIN_FILENO) == -1) 110 _exit(1); 111 if (pipe_fd[1] != STDIN_FILENO) 112 close(pipe_fd[1]); 113 114 null_fd = open(_PATH_DEVNULL, O_WRONLY, 0); 115 if (dup2(null_fd, STDOUT_FILENO) == -1) 116 _exit(1); 117 if (dup2(null_fd, STDERR_FILENO) == -1) 118 _exit(1); 119 if (null_fd != STDOUT_FILENO && null_fd != STDERR_FILENO) 120 close(null_fd); 121 122 closefrom(STDERR_FILENO + 1); 123 124 execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL); 125 _exit(1); 126 default: 127 /* Parent process. */ 128 close(pipe_fd[1]); 129 130 wp->pipe_fd = pipe_fd[0]; 131 wp->pipe_off = EVBUFFER_LENGTH(wp->event->input); 132 133 wp->pipe_event = bufferevent_new(wp->pipe_fd, 134 NULL, NULL, cmd_pipe_pane_error_callback, wp); 135 bufferevent_enable(wp->pipe_event, EV_WRITE); 136 137 setblocking(wp->pipe_fd, 0); 138 139 free(cmd); 140 return (CMD_RETURN_NORMAL); 141 } 142 } 143 144 void 145 cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev, 146 __unused short what, void *data) 147 { 148 struct window_pane *wp = data; 149 150 bufferevent_free(wp->pipe_event); 151 close(wp->pipe_fd); 152 wp->pipe_fd = -1; 153 } 154