[openssh.git] / 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 1.7 2001/02/08 00:04:52 markus 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"

int use_ssh1 = 0;
char *ssh_program = _PATH_SSH_PROGRAM;
char *sftp_server = NULL;

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(ssh_program, args);
		fprintf(stderr, "exec: %s: %s\n", ssh_program, 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, use_subsystem = 1;

	/* no subsystem if protocol 1 or the server-spec contains a '/' */
	if (use_ssh1 ||
	    (sftp_server != NULL && strchr(sftp_server, '/') != NULL))
		use_subsystem = 0;

	/* Init args array */
	if (args == NULL) {
		nargs = use_subsystem ? 6 : 5;
		i = 0;
		args = xmalloc(sizeof(*args) * nargs);
		args[i++] = "ssh";
		args[i++] = use_ssh1 ? "-oProtocol=1" : "-oProtocol=2";
		if (use_subsystem)
			args[i++] = "-s";
		args[i++] = "-oForwardAgent=no";
		args[i++] = "-oForwardX11=no";
		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 */
	if (sftp_server != NULL)
		make_ssh_args(sftp_server);
	else
		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 [-1vC] [-osshopt=value] [user@]host\n");
	exit(1);
}

int
main(int argc, char **argv)
{
	int in, out, ch, debug_level, compress_flag;
	pid_t sshpid;
	char *host, *userhost;
	LogLevel ll;
	extern int optind;
	extern char *optarg;

	debug_level = compress_flag = 0;

	while ((ch = getopt(argc, argv, "1hvCo:s:S:")) != -1) {
		switch (ch) {
		case 'C':
			compress_flag = 1;
			break;
		case 'v':
			debug_level = MIN(3, debug_level + 1);
			break;
		case 'o':
			make_ssh_args("-o");
			make_ssh_args(optarg);
			break;
		case '1':
			use_ssh1 = 1;
			if (sftp_server == NULL)
				sftp_server = _PATH_SFTP_SERVER;
			break;
		case 's':
			sftp_server = optarg;
			break;
		case 'S':
			ssh_program = optarg;
			break;
		case 'h':
		default:
			usage();
		}
	}

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

	userhost = argv[optind];

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

	if (!*host) {
		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(host);

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

	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));

	if (waitpid(sshpid, NULL, 0) == -1)
		fatal("Couldn't wait for ssh process: %s", strerror(errno));

	exit(0);
}
Commit	Line	Data
61e96248	1	/*
	2	* Copyright (c) 2001 Damien Miller. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	14	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	15	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	16	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	17	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	18	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	19	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	20	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	21	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	22	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	23	*/
	24
	25	#include "includes.h"
	26
0426a3b4	27	RCSID("$OpenBSD: sftp.c,v 1.7 2001/02/08 00:04:52 markus Exp $");
61e96248	28
	29	/* XXX: commandline mode */
	30	/* XXX: copy between two remote hosts (commandline) */
	31	/* XXX: short-form remote directory listings (like 'ls -C') */
	32
	33	#include "buffer.h"
	34	#include "xmalloc.h"
	35	#include "log.h"
	36	#include "pathnames.h"
	37
	38	#include "sftp.h"
	39	#include "sftp-common.h"
	40	#include "sftp-client.h"
	41	#include "sftp-int.h"
	42
0426a3b4	43	int use_ssh1 = 0;
	44	char *ssh_program = _PATH_SSH_PROGRAM;
	45	char *sftp_server = NULL;
	46
61e96248	47	void
	48	connect_to_server(char *args, int in, int out, pid_t sshpid)
	49	{
	50	int c_in, c_out;
	51	#ifdef USE_PIPES
	52	int pin[2], pout[2];
	53	if ((pipe(pin) == -1) \|\| (pipe(pout) == -1))
	54	fatal("pipe: %s", strerror(errno));
	55	*in = pin[0];
	56	*out = pout[1];
	57	c_in = pout[0];
	58	c_out = pin[1];
	59	#else /* USE_PIPES */
	60	int inout[2];
	61	if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1)
	62	fatal("socketpair: %s", strerror(errno));
	63	in = out = inout[0];
	64	c_in = c_out = inout[1];
	65	#endif /* USE_PIPES */
	66
	67	if ((*sshpid = fork()) == -1)
	68	fatal("fork: %s", strerror(errno));
	69	else if (*sshpid == 0) {
	70	if ((dup2(c_in, STDIN_FILENO) == -1) \|\|
	71	(dup2(c_out, STDOUT_FILENO) == -1)) {
	72	fprintf(stderr, "dup2: %s\n", strerror(errno));
	73	exit(1);
	74	}
	75	close(*in);
	76	close(*out);
	77	close(c_in);
	78	close(c_out);
0426a3b4	79	execv(ssh_program, args);
0426a3b4	80	fprintf(stderr, "exec: %s: %s\n", ssh_program, strerror(errno));
61e96248	81	exit(1);
	82	}
	83
	84	close(c_in);
	85	close(c_out);
	86	}
	87
	88	char **
	89	make_ssh_args(char *add_arg)
	90	{
	91	static char **args = NULL;
	92	static int nargs = 0;
	93	char debug_buf[4096];
0426a3b4	94	int i, use_subsystem = 1;
	95
	96	/* no subsystem if protocol 1 or the server-spec contains a '/' */
	97	if (use_ssh1 \|\|
	98	(sftp_server != NULL && strchr(sftp_server, '/') != NULL))
	99	use_subsystem = 0;
61e96248	100
	101	/* Init args array */
	102	if (args == NULL) {
0426a3b4	103	nargs = use_subsystem ? 6 : 5;
61e96248	104	i = 0;
	105	args = xmalloc(sizeof(args) nargs);
	106	args[i++] = "ssh";
0426a3b4	107	args[i++] = use_ssh1 ? "-oProtocol=1" : "-oProtocol=2";
	108	if (use_subsystem)
	109	args[i++] = "-s";
	110	args[i++] = "-oForwardAgent=no";
	111	args[i++] = "-oForwardX11=no";
61e96248	112	args[i++] = NULL;
	113	}
	114
	115	/* If asked to add args, then do so and return */
	116	if (add_arg) {
	117	i = nargs++ - 1;
	118	args = xrealloc(args, sizeof(args) nargs);
	119	args[i++] = add_arg;
	120	args[i++] = NULL;
	121	return(NULL);
	122	}
	123
	124	/* Otherwise finish up and return the arg array */
0426a3b4	125	if (sftp_server != NULL)
	126	make_ssh_args(sftp_server);
	127	else
	128	make_ssh_args("sftp");
61e96248	129
	130	/* XXX: overflow - doesn't grow debug_buf */
	131	debug_buf[0] = '\0';
	132	for(i = 0; args[i]; i++) {
	133	if (i)
	134	strlcat(debug_buf, " ", sizeof(debug_buf));
	135
	136	strlcat(debug_buf, args[i], sizeof(debug_buf));
	137	}
	138	debug("SSH args \"%s\"", debug_buf);
	139
	140	return(args);
	141	}
	142
2b87da3b	143	void
61e96248	144	usage(void)
61e96248	145	{
0426a3b4	146	fprintf(stderr, "usage: sftp [-1vC] [-osshopt=value] [user@]host\n");
61e96248	147	exit(1);
	148	}
	149
2b87da3b	150	int
61e96248	151	main(int argc, char **argv)
61e96248	152	{
0426a3b4	153	int in, out, ch, debug_level, compress_flag;
61e96248	154	pid_t sshpid;
0426a3b4	155	char host, userhost;
61e96248	156	LogLevel ll;
0426a3b4	157	extern int optind;
0426a3b4	158	extern char *optarg;
61e96248	159
61e96248	160	debug_level = compress_flag = 0;
0426a3b4	161
	162	while ((ch = getopt(argc, argv, "1hvCo:s:S:")) != -1) {
	163	switch (ch) {
	164	case 'C':
61e96248	165	compress_flag = 1;
0426a3b4	166	break;
	167	case 'v':
	168	debug_level = MIN(3, debug_level + 1);
	169	break;
	170	case 'o':
	171	make_ssh_args("-o");
	172	make_ssh_args(optarg);
	173	break;
	174	case '1':
	175	use_ssh1 = 1;
	176	if (sftp_server == NULL)
	177	sftp_server = _PATH_SFTP_SERVER;
	178	break;
	179	case 's':
	180	sftp_server = optarg;
	181	break;
	182	case 'S':
	183	ssh_program = optarg;
	184	break;
	185	case 'h':
	186	default:
61e96248	187	usage();
	188	}
	189	}
	190
0426a3b4	191	if (optind == argc \|\| argc > (optind + 1))
61e96248	192	usage();
61e96248	193
0426a3b4	194	userhost = argv[optind];
	195
	196	if ((host = strchr(userhost, '@')) == NULL)
	197	host = userhost;
61e96248	198	else {
0426a3b4	199	*host = '\0';
0426a3b4	200	if (!userhost[0]) {
61e96248	201	fprintf(stderr, "Missing username\n");
	202	usage();
	203	}
	204	make_ssh_args("-l");
0426a3b4	205	make_ssh_args(userhost);
0426a3b4	206	host++;
61e96248	207	}
61e96248	208
0426a3b4	209	if (!*host) {
61e96248	210	fprintf(stderr, "Missing hostname\n");
	211	usage();
	212	}
	213
	214	/* Set up logging and debug '-d' arguments to ssh */
	215	ll = SYSLOG_LEVEL_INFO;
	216	switch (debug_level) {
	217	case 1:
	218	ll = SYSLOG_LEVEL_DEBUG1;
	219	make_ssh_args("-v");
	220	break;
	221	case 2:
	222	ll = SYSLOG_LEVEL_DEBUG2;
	223	make_ssh_args("-v");
	224	make_ssh_args("-v");
	225	break;
	226	case 3:
	227	ll = SYSLOG_LEVEL_DEBUG3;
	228	make_ssh_args("-v");
	229	make_ssh_args("-v");
	230	make_ssh_args("-v");
	231	break;
	232	}
	233
	234	if (compress_flag)
	235	make_ssh_args("-C");
	236
	237	log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);
	238
0426a3b4	239	make_ssh_args(host);
61e96248	240
0426a3b4	241	fprintf(stderr, "Connecting to %s...\n", host);
61e96248	242
	243	connect_to_server(make_ssh_args(NULL), &in, &out, &sshpid);
	244
	245	do_init(in, out);
	246
	247	interactive_loop(in, out);
	248
	249	close(in);
	250	close(out);
	251
	252	if (kill(sshpid, SIGHUP) == -1)
	253	fatal("Couldn't terminate ssh process: %s", strerror(errno));
	254
0426a3b4	255	if (waitpid(sshpid, NULL, 0) == -1)
0426a3b4	256	fatal("Couldn't wait for ssh process: %s", strerror(errno));
61e96248	257
	258	exit(0);
	259	}