sftp.c

/*
 * Copyright (c) 2001 Damien Miller.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"

RCSID("$OpenBSD: sftp.c,v 1.2 2001/02/04 15:32:25 stevesk Exp $");

/* XXX: commandline mode */
/* XXX: copy between two remote hosts (commandline) */
/* XXX: short-form remote directory listings (like 'ls -C') */

#include "buffer.h"
#include "xmalloc.h"
#include "log.h"
#include "pathnames.h"

#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
#include "sftp-int.h"

void
connect_to_server(char **args, int *in, int *out, pid_t *sshpid)
{
	int c_in, c_out;
#ifdef USE_PIPES
	int pin[2], pout[2];
	if ((pipe(pin) == -1) || (pipe(pout) == -1))
		fatal("pipe: %s", strerror(errno));
	*in = pin[0];
	*out = pout[1];
	c_in = pout[0];
	c_out = pin[1];
#else /* USE_PIPES */
	int inout[2];
	if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1)
		fatal("socketpair: %s", strerror(errno));
	*in = *out = inout[0];
	c_in = c_out = inout[1];
#endif /* USE_PIPES */

	if ((*sshpid = fork()) == -1)
		fatal("fork: %s", strerror(errno));
	else if (*sshpid == 0) {
		if ((dup2(c_in, STDIN_FILENO) == -1) ||
		    (dup2(c_out, STDOUT_FILENO) == -1)) {
			fprintf(stderr, "dup2: %s\n", strerror(errno));
			exit(1);
		}
		close(*in);
		close(*out);
		close(c_in);
		close(c_out);
		execv(_PATH_SSH_PROGRAM, args);
		fprintf(stderr, "exec: %s", strerror(errno));
		exit(1);
	}

	close(c_in);
	close(c_out);
}

char **
make_ssh_args(char *add_arg)
{
	static char **args = NULL;
	static int nargs = 0;
	char debug_buf[4096];
	int i;

	/* Init args array */
	if (args == NULL) {
		nargs = 4;
		i = 0;
		args = xmalloc(sizeof(*args) * nargs);
		args[i++] = "ssh";
		args[i++] = "-oProtocol=2";
		args[i++] = "-s";
		args[i++] = NULL;
	}

	/* If asked to add args, then do so and return */
	if (add_arg) {
		i = nargs++ - 1;
		args = xrealloc(args, sizeof(*args) * nargs);
		args[i++] = add_arg;
		args[i++] = NULL;
		return(NULL);
	}

	/* Otherwise finish up and return the arg array */
	make_ssh_args("sftp");

	/* XXX: overflow - doesn't grow debug_buf */
	debug_buf[0] = '\0';
	for(i = 0; args[i]; i++) {
		if (i)
			strlcat(debug_buf, " ", sizeof(debug_buf));

		strlcat(debug_buf, args[i], sizeof(debug_buf));
	}
	debug("SSH args \"%s\"", debug_buf);

	return(args);
}

void
usage(void)
{
	fprintf(stderr, "usage: sftp [-vC] [-osshopt=value] [user@]host\n");
	exit(1);
}

int
main(int argc, char **argv)
{
	int in, out, i, debug_level, compress_flag;
	pid_t sshpid;
	char *cp;
	LogLevel ll;

	debug_level = compress_flag = 0;
	for(i = 1; i < argc && argv[i][0] == '-'; i++) {
		if (!strcmp(argv[i], "-v"))
			debug_level = MIN(3, debug_level + 1);
		else if (!strcmp(argv[i], "-C"))
			compress_flag = 1;
		else if (!strncmp(argv[i], "-o", 2)) {
			make_ssh_args(argv[i]);
		} else {
			fprintf(stderr, "Unknown option \"%s\"\n", argv[i]);
			usage();
		}
	}

	if (i == argc || argc > (i + 1))
		usage();

	if ((cp = strchr(argv[i], '@')) == NULL)
		cp = argv[i];
	else {
		*cp = '\0';
		if (!argv[i][0]) {
			fprintf(stderr, "Missing username\n");
			usage();
		}
		make_ssh_args("-l");
		make_ssh_args(argv[i]);
		cp++;
	}

	if (!*cp) {
		fprintf(stderr, "Missing hostname\n");
		usage();
	}

	/* Set up logging and debug '-d' arguments to ssh */
	ll = SYSLOG_LEVEL_INFO;
	switch (debug_level) {
	case 1:
		ll = SYSLOG_LEVEL_DEBUG1;
		make_ssh_args("-v");
		break;
	case 2:
		ll = SYSLOG_LEVEL_DEBUG2;
		make_ssh_args("-v");
		make_ssh_args("-v");
		break;
	case 3:
		ll = SYSLOG_LEVEL_DEBUG3;
		make_ssh_args("-v");
		make_ssh_args("-v");
		make_ssh_args("-v");
		break;
	}

	if (compress_flag)
		make_ssh_args("-C");

	log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);

	make_ssh_args(cp);

	fprintf(stderr, "Connecting to %s...\n", cp);

	connect_to_server(make_ssh_args(NULL), &in, &out, &sshpid);

	do_init(in, out);

	interactive_loop(in, out);

	close(in);
	close(out);

	if (kill(sshpid, SIGHUP) == -1)
		fatal("Couldn't terminate ssh process: %s", strerror(errno));

	/* XXX: wait? */

	exit(0);
}