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 <signal.h> 25 #include <stdlib.h> 26 #include <string.h> 27 #include <time.h> 28 #include <unistd.h> 29 30 #include "tmux.h" 31 32 /* 33 * Open pipe to redirect pane output. If already open, close first. 34 */ 35 36 static enum cmd_retval cmd_pipe_pane_exec(struct cmd *, struct cmdq_item *); 37 38 static void cmd_pipe_pane_read_callback(struct bufferevent *, void *); 39 static void cmd_pipe_pane_write_callback(struct bufferevent *, void *); 40 static void cmd_pipe_pane_error_callback(struct bufferevent *, short, void *); 41 42 const struct cmd_entry cmd_pipe_pane_entry = { 43 .name = "pipe-pane", 44 .alias = "pipep", 45 46 .args = { "IOot:", 0, 1 }, 47 .usage = "[-IOo] " CMD_TARGET_PANE_USAGE " [command]", 48 49 .target = { 't', CMD_FIND_PANE, 0 }, 50 51 .flags = CMD_AFTERHOOK, 52 .exec = cmd_pipe_pane_exec 53 }; 54 55 static enum cmd_retval 56 cmd_pipe_pane_exec(struct cmd *self, struct cmdq_item *item) 57 { 58 struct args *args = self->args; 59 struct client *c = cmd_find_client(item, NULL, 1); 60 struct window_pane *wp = item->target.wp; 61 struct session *s = item->target.s; 62 struct winlink *wl = item->target.wl; 63 char *cmd; 64 int old_fd, pipe_fd[2], null_fd, in, out; 65 struct format_tree *ft; 66 sigset_t set, oldset; 67 68 /* Destroy the old pipe. */ 69 old_fd = wp->pipe_fd; 70 if (wp->pipe_fd != -1) { 71 bufferevent_free(wp->pipe_event); 72 close(wp->pipe_fd); 73 wp->pipe_fd = -1; 74 75 if (window_pane_destroy_ready(wp)) { 76 server_destroy_pane(wp, 1); 77 return (CMD_RETURN_NORMAL); 78 } 79 } 80 81 /* If no pipe command, that is enough. */ 82 if (args->argc == 0 || *args->argv[0] == '\0') 83 return (CMD_RETURN_NORMAL); 84 85 /* 86 * With -o, only open the new pipe if there was no previous one. This 87 * allows a pipe to be toggled with a single key, for example: 88 * 89 * bind ^p pipep -o 'cat >>~/output' 90 */ 91 if (args_has(self->args, 'o') && old_fd != -1) 92 return (CMD_RETURN_NORMAL); 93 94 /* What do we want to do? Neither -I or -O is -O. */ 95 if (args_has(self->args, 'I')) { 96 in = 1; 97 out = args_has(self->args, 'O'); 98 } else { 99 in = 0; 100 out = 1; 101 } 102 103 /* Open the new pipe. */ 104 if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pipe_fd) != 0) { 105 cmdq_error(item, "socketpair error: %s", strerror(errno)); 106 return (CMD_RETURN_ERROR); 107 } 108 109 /* Expand the command. */ 110 ft = format_create(item->client, item, FORMAT_NONE, 0); 111 format_defaults(ft, c, s, wl, wp); 112 cmd = format_expand_time(ft, args->argv[0]); 113 format_free(ft); 114 115 /* Fork the child. */ 116 sigfillset(&set); 117 sigprocmask(SIG_BLOCK, &set, &oldset); 118 switch (fork()) { 119 case -1: 120 sigprocmask(SIG_SETMASK, &oldset, NULL); 121 cmdq_error(item, "fork error: %s", strerror(errno)); 122 123 free(cmd); 124 return (CMD_RETURN_ERROR); 125 case 0: 126 /* Child process. */ 127 proc_clear_signals(server_proc, 1); 128 sigprocmask(SIG_SETMASK, &oldset, NULL); 129 close(pipe_fd[0]); 130 131 null_fd = open(_PATH_DEVNULL, O_WRONLY, 0); 132 if (out) { 133 if (dup2(pipe_fd[1], STDIN_FILENO) == -1) 134 _exit(1); 135 } else { 136 if (dup2(null_fd, STDIN_FILENO) == -1) 137 _exit(1); 138 } 139 if (in) { 140 if (dup2(pipe_fd[1], STDOUT_FILENO) == -1) 141 _exit(1); 142 if (pipe_fd[1] != STDOUT_FILENO) 143 close(pipe_fd[1]); 144 } else { 145 if (dup2(null_fd, STDOUT_FILENO) == -1) 146 _exit(1); 147 } 148 if (dup2(null_fd, STDERR_FILENO) == -1) 149 _exit(1); 150 closefrom(STDERR_FILENO + 1); 151 152 execl(_PATH_BSHELL, "sh", "-c", cmd, (char *) NULL); 153 _exit(1); 154 default: 155 /* Parent process. */ 156 sigprocmask(SIG_SETMASK, &oldset, NULL); 157 close(pipe_fd[1]); 158 159 wp->pipe_fd = pipe_fd[0]; 160 if (wp->fd != -1) 161 wp->pipe_off = EVBUFFER_LENGTH(wp->event->input); 162 else 163 wp->pipe_off = 0; 164 165 setblocking(wp->pipe_fd, 0); 166 wp->pipe_event = bufferevent_new(wp->pipe_fd, 167 cmd_pipe_pane_read_callback, 168 cmd_pipe_pane_write_callback, 169 cmd_pipe_pane_error_callback, 170 wp); 171 if (wp->pipe_event == NULL) 172 fatalx("out of memory"); 173 if (out) 174 bufferevent_enable(wp->pipe_event, EV_WRITE); 175 if (in) 176 bufferevent_enable(wp->pipe_event, EV_READ); 177 178 free(cmd); 179 return (CMD_RETURN_NORMAL); 180 } 181 } 182 183 static void 184 cmd_pipe_pane_read_callback(__unused struct bufferevent *bufev, void *data) 185 { 186 struct window_pane *wp = data; 187 struct evbuffer *evb = wp->pipe_event->input; 188 size_t available; 189 190 available = EVBUFFER_LENGTH(evb); 191 log_debug("%%%u pipe read %zu", wp->id, available); 192 193 bufferevent_write(wp->event, EVBUFFER_DATA(evb), available); 194 evbuffer_drain(evb, available); 195 196 if (window_pane_destroy_ready(wp)) 197 server_destroy_pane(wp, 1); 198 } 199 200 static void 201 cmd_pipe_pane_write_callback(__unused struct bufferevent *bufev, void *data) 202 { 203 struct window_pane *wp = data; 204 205 log_debug("%%%u pipe empty", wp->id); 206 207 if (window_pane_destroy_ready(wp)) 208 server_destroy_pane(wp, 1); 209 } 210 211 static void 212 cmd_pipe_pane_error_callback(__unused struct bufferevent *bufev, 213 __unused short what, void *data) 214 { 215 struct window_pane *wp = data; 216 217 log_debug("%%%u pipe error", wp->id); 218 219 bufferevent_free(wp->pipe_event); 220 close(wp->pipe_fd); 221 wp->pipe_fd = -1; 222 223 if (window_pane_destroy_ready(wp)) 224 server_destroy_pane(wp, 1); 225 } 226