Initial import + Cmake

tobhe · Feb 8, 2022 · aa3d20b · aa3d20b
commit aa3d20b
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diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -0,0 +1,50 @@
+# Copyright (c) 2022 Tobias Heider <[email protected]>
+#
+# 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.
+
+cmake_minimum_required(VERSION 3.12)
+
+project(cu)
+
+find_library(bsd NAMES bsd)
+
+add_definitions(-DLIBBSD_OVERLAY -D_GNU_SOURCE)
+
+set(CFLAGS)
+list(APPEND CFLAGS
+	-O2
+	-Wall
+	-Wno-pointer-sign
+	-Wno-deprecated-declarations
+	-Wstrict-prototypes
+	-Wmissing-prototypes
+	-Wmissing-declarations
+	-Wshadow
+	-Wpointer-arith
+	-Wcast-qual
+	-Wsign-compare
+	"$<$<CONFIG:DEBUG>:-O0;-g>"
+)
+
+add_executable(cu
+	command.c
+	cu.c
+	error.c
+	input.c
+	xmodem.c
+)
+
+target_link_libraries(cu bsd event)
+target_include_directories(cu PUBLIC
+	"/usr/include"
+	"/usr/include/bsd/")
diff --git a/Makefile b/Makefile
@@ -0,0 +1,11 @@
+# $OpenBSD: Makefile,v 1.3 2012/07/10 11:42:02 nicm Exp $
+
+PROG=	cu
+SRCS=	cu.c command.c error.c input.c xmodem.c
+
+CDIAGFLAGS+= -Wall -W -Wno-unused-parameter
+
+LDADD=  -levent
+DPADD=  ${LIBEVENT}
+
+.include <bsd.prog.mk>
diff --git a/command.c b/command.c
@@ -0,0 +1,302 @@
+/* $OpenBSD: command.c,v 1.18 2019/06/28 13:35:00 deraadt Exp $ */
+
+/*
+ * Copyright (c) 2012 Nicholas Marriott <[email protected]>
+ *
+ * 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/wait.h>
+
+#include <event.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <paths.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <vis.h>
+
+#include "cu.h"
+
+void	pipe_command(void);
+void	connect_command(void);
+void	send_file(void);
+void	send_xmodem(void);
+void	set_speed(void);
+void	start_record(void);
+
+void
+pipe_command(void)
+{
+	const char	*cmd;
+	pid_t		 pid;
+	int		 fd;
+
+	cmd = get_input("Local command?");
+	if (cmd == NULL || *cmd == '\0')
+		return;
+
+	restore_termios();
+	set_blocking(line_fd, 1);
+
+	switch (pid = fork()) {
+	case -1:
+		cu_err(1, "fork");
+	case 0:
+		fd = open(_PATH_DEVNULL, O_RDWR);
+		if (fd == -1 || dup2(fd, STDIN_FILENO) == -1)
+			_exit(1);
+		close(fd);
+
+		if (signal(SIGINT, SIG_DFL) == SIG_ERR)
+			_exit(1);
+		if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
+			_exit(1);
+
+		/* attach stdout to line */
+		if (dup2(line_fd, STDOUT_FILENO) == -1)
+			_exit(1);
+
+#if 0
+		if (closefrom(STDERR_FILENO + 1) != 0)
+			_exit(1);
+#else
+		closefrom(STDERR_FILENO + 1);
+#endif
+
+		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *)NULL);
+		_exit(1);
+	default:
+		while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
+			/* nothing */;
+		break;
+	}
+
+	set_blocking(line_fd, 0);
+	set_termios();
+}
+
+void
+connect_command(void)
+{
+	const char	*cmd;
+	pid_t		 pid;
+
+	/*
+	 * Fork a program with:
+	 *  0 <-> remote tty in
+	 *  1 <-> remote tty out
+	 *  2 <-> local tty stderr
+	 */
+
+	cmd = get_input("Local command?");
+	if (cmd == NULL || *cmd == '\0')
+		return;
+
+	restore_termios();
+	set_blocking(line_fd, 1);
+
+	switch (pid = fork()) {
+	case -1:
+		cu_err(1, "fork");
+	case 0:
+		if (signal(SIGINT, SIG_DFL) == SIG_ERR)
+			_exit(1);
+		if (signal(SIGQUIT, SIG_DFL) == SIG_ERR)
+			_exit(1);
+
+		/* attach stdout and stdin to line */
+		if (dup2(line_fd, STDOUT_FILENO) == -1)
+			_exit(1);
+		if (dup2(line_fd, STDIN_FILENO) == -1)
+			_exit(1);
+
+#if 0
+		if (closefrom(STDERR_FILENO + 1) != 0)
+			_exit(1);
+#else
+		closefrom(STDERR_FILENO + 1);
+#endif
+
+		execl(_PATH_BSHELL, "sh", "-c", cmd, (char *)NULL);
+		_exit(1);
+	default:
+		while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
+			/* nothing */;
+		break;
+	}
+
+	set_blocking(line_fd, 0);
+	set_termios();
+}
+
+void
+send_file(void)
+{
+	const char	*file;
+	FILE		*f;
+	char		 buf[BUFSIZ], *expanded;
+	size_t		 len;
+
+	file = get_input("Local file?");
+	if (file == NULL || *file == '\0')
+		return;
+
+	expanded = tilde_expand(file);
+	f = fopen(expanded, "r");
+	if (f == NULL) {
+		cu_warn("%s", file);
+		return;
+	}
+
+	while (!feof(f) && !ferror(f)) {
+		len = fread(buf, 1, sizeof(buf), f);
+		if (len != 0)
+			bufferevent_write(line_ev, buf, len);
+	}
+
+	fclose(f);
+	free(expanded);
+}
+
+void
+send_xmodem(void)
+{
+	const char	*file;
+	char		*expanded;
+
+	file = get_input("Local file?");
+	if (file == NULL || *file == '\0')
+		return;
+
+	expanded = tilde_expand(file);
+	xmodem_send(expanded);
+	free(expanded);
+}
+
+void
+set_speed(void)
+{
+	const char	*s, *errstr;
+	int		 speed;
+
+	s = get_input("New speed?");
+	if (s == NULL || *s == '\0')
+		return;
+
+	speed = strtonum(s, 0, UINT_MAX, &errstr);
+	if (errstr != NULL) {
+		cu_warnx("speed is %s: %s", errstr, s);
+		return;
+	}
+
+	if (set_line(speed) != 0)
+		cu_warn("tcsetattr");
+}
+
+void
+start_record(void)
+{
+	const char	*file;
+
+	if (record_file != NULL) {
+		fclose(record_file);
+		record_file = NULL;
+	}
+
+	file = get_input("Record file?");
+	if (file == NULL || *file == '\0')
+		return;
+
+	record_file = fopen(file, "a");
+	if (record_file == NULL)
+		cu_warnx("%s", file);
+}
+
+void
+do_command(char c)
+{
+	char esc[4 + 1];
+
+	if (restricted && strchr("CRX$>", c) != NULL) {
+		cu_warnx("~%c command is not allowed in restricted mode", c);
+		return;
+	}
+
+	switch (c) {
+	case '.':
+	case '\004': /* ^D */
+		event_loopexit(NULL);
+		break;
+	case '\032': /* ^Z */
+		restore_termios();
+		kill(getpid(), SIGTSTP);
+		set_termios();
+		break;
+	case 'C':
+		connect_command();
+		break;
+	case 'D':
+#if 0
+		ioctl(line_fd, TIOCCDTR, NULL);
+		sleep(1);
+		ioctl(line_fd, TIOCSDTR, NULL);
+		break;
+#endif
+	case 'R':
+		start_record();
+		break;
+	case 'S':
+		set_speed();
+		break;
+	case 'X':
+		send_xmodem();
+		break;
+	case '$':
+		pipe_command();
+		break;
+	case '>':
+		send_file();
+		break;
+	case '#':
+		ioctl(line_fd, TIOCSBRK, NULL);
+		sleep(1);
+		ioctl(line_fd, TIOCCBRK, NULL);
+		break;
+	default:
+		if ((u_char)c == escape_char)
+			bufferevent_write(line_ev, &c, 1);
+		break;
+	case '?':
+		vis(esc, escape_char, VIS_WHITE | VIS_NOSLASH, 0);
+		printf("\r\n"
+		    "%s#      send break\r\n"
+		    "%s$      pipe local command to remote host\r\n"
+		    "%s>      send file to remote host\r\n"
+		    "%sC      connect program to remote host\r\n"
+		    "%sD      de-assert DTR line briefly\r\n"
+		    "%sR      start recording to file\r\n"
+		    "%sS      set speed\r\n"
+		    "%sX      send file with XMODEM\r\n"
+		    "%s?      get this summary\r\n",
+		    esc, esc, esc, esc, esc, esc, esc, esc, esc
+		);
+		break;
+	}
+}