forked from github/abduco
431 lines
9.9 KiB
C
431 lines
9.9 KiB
C
/*
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* Copyright (c) 2013-2014 Marc André Tanner <mat at brain-dump.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <signal.h>
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#include <libgen.h>
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#include <string.h>
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#include <limits.h>
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#include <dirent.h>
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#include <termios.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#if defined(__linux__) || defined(__CYGWIN__)
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# include <pty.h>
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#elif defined(__FreeBSD__)
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# include <libutil.h>
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#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
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# include <util.h>
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#endif
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#if defined CTRL && defined _AIX
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#undef CTRL
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#endif
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#ifndef CTRL
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#define CTRL(k) ((k) & 0x1F)
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#endif
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#include "config.h"
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#ifdef _AIX
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# include "forkpty-aix.c"
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#endif
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#define CLIENT_TIMEOUT 100
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#define countof(arr) (sizeof(arr) / sizeof((arr)[0]))
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enum PacketType {
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MSG_CONTENT = 0,
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MSG_ATTACH = 1,
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MSG_DETACH = 2,
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MSG_RESIZE = 3,
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MSG_REDRAW = 4,
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};
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/* packet sent from client to server */
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typedef struct {
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unsigned char type;
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unsigned char len;
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union {
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char msg[sizeof(struct winsize)];
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struct winsize ws;
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int i;
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} u;
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} ClientPacket;
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/* packet sent from server to all clients */
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typedef struct {
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char buf[BUFSIZ];
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ssize_t len;
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} ServerPacket;
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typedef struct {
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ClientPacket pkt;
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size_t off;
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} ClientPacketState;
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typedef struct {
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ServerPacket *pkt;
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size_t off;
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} ServerPacketState;
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typedef struct Client Client;
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struct Client {
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ServerPacketState output; /* display output as received from server */
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ClientPacketState input; /* input as sent to the server */
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int socket;
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enum {
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STATE_CONNECTED,
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STATE_ATTACHED,
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STATE_DETACHED,
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STATE_DISCONNECTED,
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} state;
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time_t last_activity;
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bool need_resize;
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Client *next;
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};
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typedef struct {
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Client *clients;
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int client_count;
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int socket;
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ServerPacket pty_output;
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ClientPacketState pty_input;
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ClientPacket queue[10];
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int queue_count;
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int queue_insert;
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int queue_remove;
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int pty;
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int exit_status;
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struct termios term;
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pid_t pid;
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volatile sig_atomic_t running;
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const char *name;
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} Server;
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static Server server = { .running = true, .exit_status = -1 };
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static struct termios orig_term, cur_term;
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bool has_term;
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static struct sockaddr_un sockaddr = {
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.sun_family = AF_UNIX,
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};
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static int create_socket(const char *name);
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static void die(const char *s);
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static void info(const char *str, ...);
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static bool is_client_packet_complete(ClientPacketState *pkt) {
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return pkt->off == sizeof pkt->pkt;
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}
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static bool is_server_packet_complete(ServerPacketState *pkt) {
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return pkt->pkt && pkt->off == pkt->pkt->len;
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}
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static bool is_server_packet_nonempty(ServerPacketState *pkt) {
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return pkt->pkt && pkt->pkt->len > 0;
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}
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#include "debug.c"
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#include "client.c"
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#include "server.c"
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static void info(const char *str, ...) {
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va_list ap;
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va_start(ap, str);
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fprintf(stdout, "\e[999H\r\n");
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if (str) {
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fprintf(stdout, "%s: ", server.name);
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vfprintf(stdout, str, ap);
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fprintf(stdout, "\r\n");
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}
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fflush(stdout);
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va_end(ap);
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}
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static void die(const char *s) {
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perror(s);
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exit(EXIT_FAILURE);
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}
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static void usage() {
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fprintf(stderr, "usage: abduco [-a|-A|-c|-n] [-e detachkey] name command\n");
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exit(EXIT_FAILURE);
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}
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static int create_socket_dir() {
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size_t maxlen = sizeof(sockaddr.sun_path);
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char *dir = getenv("HOME");
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if (!dir)
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dir = "/tmp";
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int len = snprintf(sockaddr.sun_path, maxlen, "%s/.%s/", dir, server.name);
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if (len >= maxlen)
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return -1;
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if (mkdir(sockaddr.sun_path, 0750) == -1 && errno != EEXIST)
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return -1;
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return len;
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}
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static int create_socket(const char *name) {
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size_t maxlen = sizeof(sockaddr.sun_path);
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if (name[0] == '.' || name[0] == '/') {
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strncpy(sockaddr.sun_path, name, maxlen);
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if (sockaddr.sun_path[maxlen-1])
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return -1;
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} else {
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int len = create_socket_dir(), rem = strlen(name);
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if (len == -1 || maxlen - len - rem <= 0)
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return -1;
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strncat(sockaddr.sun_path, name, maxlen - len - 1);
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}
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return socket(AF_LOCAL, SOCK_STREAM, 0);
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}
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static bool create_session(const char *name, char * const argv[]) {
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int pipefds[2];
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if (pipe(pipefds) == -1)
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return false;
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if ((server.socket = create_socket(name)) == -1)
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return false;
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socklen_t socklen = offsetof(struct sockaddr_un, sun_path) + strlen(sockaddr.sun_path) + 1;
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mode_t mode = S_IRUSR|S_IWUSR;
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fchmod(server.socket, mode);
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if (bind(server.socket, (struct sockaddr*)&sockaddr, socklen) == -1)
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return false;
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if (listen(server.socket, 5) == -1)
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goto error;
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if (fchmod(server.socket, mode) == -1 && chmod(sockaddr.sun_path, mode) == -1)
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goto error;
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pid_t pid;
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char errormsg[255];
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struct sigaction sa;
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switch ((pid = fork())) {
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case 0: /* child process */
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setsid();
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close(pipefds[0]);
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switch ((pid = fork())) {
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case 0: /* child process */
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = server_pty_died_handler;
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sigaction(SIGCHLD, &sa, NULL);
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switch (server.pid = forkpty(&server.pty, NULL, has_term ? &server.term : NULL, NULL)) {
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case 0: /* child process */
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fcntl(pipefds[1], F_SETFD, FD_CLOEXEC);
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close(server.socket);
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execvp(argv[0], argv);
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snprintf(errormsg, sizeof(errormsg), "server-execvp: %s\n", strerror(errno));
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write_all(pipefds[1], errormsg, strlen(errormsg));
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close(pipefds[1]);
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exit(EXIT_FAILURE);
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break;
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case -1:
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die("server-forkpty");
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break;
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default:
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/* SIGTTIN, SIGTTU */
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sigaction(SIGTERM, &sa, NULL);
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sigaction(SIGINT, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &sa, NULL);
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sigaction(SIGHUP, &sa, NULL);
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chdir("/");
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#ifdef NDEBUG
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int fd = open("/dev/null", O_RDWR);
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dup2(fd, 0);
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dup2(fd, 1);
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dup2(fd, 2);
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#endif /* NDEBUG */
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close(pipefds[1]);
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server_mainloop();
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break;
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}
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break;
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default:
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close(pipefds[1]);
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exit(EXIT_SUCCESS);
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break;
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}
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break;
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case -1: /* fork failed */
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return false;
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default: /* parent */
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close(pipefds[1]);
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int status;
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wait(&status); /* wait for first fork */
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if ((status = read_all(pipefds[0], errormsg, sizeof(errormsg))) > 0) {
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write_all(STDERR_FILENO, errormsg, status);
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unlink(sockaddr.sun_path);
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exit(EXIT_FAILURE);
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}
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close(pipefds[0]);
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}
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return true;
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error:
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unlink(sockaddr.sun_path);
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return false;
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}
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static bool attach_session(const char *name) {
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if (server.socket > 0)
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close(server.socket);
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if ((server.socket = create_socket(name)) == -1)
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return false;
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socklen_t socklen = offsetof(struct sockaddr_un, sun_path) + strlen(sockaddr.sun_path) + 1;
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if (connect(server.socket, (struct sockaddr*)&sockaddr, socklen) == -1)
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return false;
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if (server_set_socket_non_blocking(server.socket) == -1)
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return false;
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struct sigaction sa;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = client_sigwinch_handler;
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sigaction(SIGWINCH, &sa, NULL);
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sa.sa_handler = SIG_IGN;
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sigaction(SIGPIPE, &sa, NULL);
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atexit(client_restore_terminal);
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cur_term = orig_term;
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cur_term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IXOFF);
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cur_term.c_oflag &= ~(OPOST);
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cur_term.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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cur_term.c_cflag &= ~(CSIZE|PARENB);
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cur_term.c_cflag |= CS8;
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cur_term.c_cc[VLNEXT] = _POSIX_VDISABLE;
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cur_term.c_cc[VMIN] = 1;
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cur_term.c_cc[VTIME] = 0;
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tcsetattr(0, TCSADRAIN, &cur_term);
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client_clear_screen();
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switch (client_mainloop()) {
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case -1:
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info("detached");
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break;
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case EIO:
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info("exited due to I/O errors: %s", strerror(errno));
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break;
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}
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return true;
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}
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static int list_session() {
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if (create_socket_dir() == -1)
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return 1;
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chdir(sockaddr.sun_path);
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DIR *d = opendir(sockaddr.sun_path);
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if (!d)
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return 1;
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puts("Active sessions");
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struct dirent *e;
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while ((e = readdir(d))) {
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if (e->d_name[0] != '.') {
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struct stat sb; char buf[255];
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if (stat(e->d_name, &sb) == 0) {
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strftime(buf, sizeof(buf), "%A%t %d.%m.%Y %T", localtime(&sb.st_atime));
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printf(" %s\t%s\n", buf, e->d_name);
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}
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}
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}
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closedir(d);
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return 0;
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}
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int main(int argc, char *argv[]) {
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char *session = NULL, **cmd = NULL, action = '\0';
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server.name = basename(argv[0]);
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if (argc == 1)
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exit(list_session());
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for (int arg = 1; arg < argc; arg++) {
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if (argv[arg][0] != '-') {
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if (!session) {
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session = argv[arg];
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continue;
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} else if (!cmd) {
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cmd = &argv[arg];
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break;
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}
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}
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if (session)
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usage();
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switch (argv[arg][1]) {
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case 'a':
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case 'A':
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case 'c':
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case 'n':
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action = argv[arg][1];
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break;
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case 'e':
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if (arg + 1 >= argc)
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usage();
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char *esc = argv[++arg];
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if (esc[0] == '^' && esc[1])
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*esc = CTRL(esc[1]);
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KEY_DETACH = *esc;
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break;
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case 'v':
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puts("abduco-"VERSION" © 2013-2014 Marc André Tanner");
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exit(EXIT_SUCCESS);
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default:
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usage();
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}
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}
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if (!action || !session || (action != 'a' && !cmd))
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usage();
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if (tcgetattr(STDIN_FILENO, &orig_term) != -1) {
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server.term = orig_term;
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has_term = true;
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}
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switch (action) {
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redo:
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case 'n':
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case 'c':
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if (!create_session(session, cmd))
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die("create-session");
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if (action == 'n')
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break;
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case 'a':
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case 'A':
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if (!attach_session(session)) {
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if (action == 'A') {
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action = 'c';
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goto redo;
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}
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die("attach-session");
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}
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}
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return 0;
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}
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