sftp.c revision 99060 
1/*
2 * Copyright (c) 2001,2002 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
27RCSID("$OpenBSD: sftp.c,v 1.30 2002/06/23 09:30:14 deraadt Exp $");
28
29/* XXX: short-form remote directory listings (like 'ls -C') */
30
31#include "buffer.h"
32#include "xmalloc.h"
33#include "log.h"
34#include "pathnames.h"
35#include "misc.h"
36
37#include "sftp.h"
38#include "sftp-common.h"
39#include "sftp-client.h"
40#include "sftp-int.h"
41
42#ifdef HAVE___PROGNAME
43extern char *__progname;
44#else
45char *__progname;
46#endif
47
48FILE* infile;
49size_t copy_buffer_len = 32768;
50size_t num_requests = 16;
51
52static void
53connect_to_server(char *path, char **args, int *in, int *out, pid_t *sshpid)
54{
55	int c_in, c_out;
56
57#ifdef USE_PIPES
58	int pin[2], pout[2];
59
60	if ((pipe(pin) == -1) || (pipe(pout) == -1))
61		fatal("pipe: %s", strerror(errno));
62	*in = pin[0];
63	*out = pout[1];
64	c_in = pout[0];
65	c_out = pin[1];
66#else /* USE_PIPES */
67	int inout[2];
68
69	if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1)
70		fatal("socketpair: %s", strerror(errno));
71	*in = *out = inout[0];
72	c_in = c_out = inout[1];
73#endif /* USE_PIPES */
74
75	if ((*sshpid = fork()) == -1)
76		fatal("fork: %s", strerror(errno));
77	else if (*sshpid == 0) {
78		if ((dup2(c_in, STDIN_FILENO) == -1) ||
79		    (dup2(c_out, STDOUT_FILENO) == -1)) {
80			fprintf(stderr, "dup2: %s\n", strerror(errno));
81			exit(1);
82		}
83		close(*in);
84		close(*out);
85		close(c_in);
86		close(c_out);
87		execv(path, args);
88		fprintf(stderr, "exec: %s: %s\n", path, strerror(errno));
89		exit(1);
90	}
91
92	close(c_in);
93	close(c_out);
94}
95
96static void
97usage(void)
98{
99	extern char *__progname;
100
101	fprintf(stderr,
102	    "usage: %s [-vC1] [-b batchfile] [-o option] [-s subsystem|path] [-B buffer_size]\n"
103	    "            [-F config] [-P direct server path] [-S program]\n"
104	    "            [user@]host[:file [file]]\n", __progname);
105	exit(1);
106}
107
108int
109main(int argc, char **argv)
110{
111	int in, out, ch;
112	pid_t sshpid;
113	char *host, *userhost, *cp, *file2;
114	int debug_level = 0, sshver = 2;
115	char *file1 = NULL, *sftp_server = NULL;
116	char *ssh_program = _PATH_SSH_PROGRAM, *sftp_direct = NULL;
117	LogLevel ll = SYSLOG_LEVEL_INFO;
118	arglist args;
119	extern int optind;
120	extern char *optarg;
121
122	__progname = get_progname(argv[0]);
123	args.list = NULL;
124	addargs(&args, "ssh");		/* overwritten with ssh_program */
125	addargs(&args, "-oFallBackToRsh no");
126	addargs(&args, "-oForwardX11 no");
127	addargs(&args, "-oForwardAgent no");
128	addargs(&args, "-oClearAllForwardings yes");
129	ll = SYSLOG_LEVEL_INFO;
130	infile = stdin;		/* Read from STDIN unless changed by -b */
131
132	while ((ch = getopt(argc, argv, "1hvCo:s:S:b:B:F:P:R:")) != -1) {
133		switch (ch) {
134		case 'C':
135			addargs(&args, "-C");
136			break;
137		case 'v':
138			if (debug_level < 3) {
139				addargs(&args, "-v");
140				ll = SYSLOG_LEVEL_DEBUG1 + debug_level;
141			}
142			debug_level++;
143			break;
144		case 'F':
145		case 'o':
146			addargs(&args, "-%c%s", ch, optarg);
147			break;
148		case '1':
149			sshver = 1;
150			if (sftp_server == NULL)
151				sftp_server = _PATH_SFTP_SERVER;
152			break;
153		case 's':
154			sftp_server = optarg;
155			break;
156		case 'S':
157			ssh_program = optarg;
158			break;
159		case 'b':
160			if (infile == stdin) {
161				infile = fopen(optarg, "r");
162				if (infile == NULL)
163					fatal("%s (%s).", strerror(errno), optarg);
164			} else
165				fatal("Filename already specified.");
166			break;
167		case 'P':
168			sftp_direct = optarg;
169			break;
170		case 'B':
171			copy_buffer_len = strtol(optarg, &cp, 10);
172			if (copy_buffer_len == 0 || *cp != '\0')
173				fatal("Invalid buffer size \"%s\"", optarg);
174			break;
175		case 'R':
176			num_requests = strtol(optarg, &cp, 10);
177			if (num_requests == 0 || *cp != '\0')
178				fatal("Invalid number of requests \"%s\"",
179				    optarg);
180			break;
181		case 'h':
182		default:
183			usage();
184		}
185	}
186
187	log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);
188
189	if (sftp_direct == NULL) {
190		if (optind == argc || argc > (optind + 2))
191			usage();
192
193		userhost = xstrdup(argv[optind]);
194		file2 = argv[optind+1];
195
196		if ((cp = colon(userhost)) != NULL) {
197			*cp++ = '\0';
198			file1 = cp;
199		}
200
201		if ((host = strchr(userhost, '@')) == NULL)
202			host = userhost;
203		else {
204			*host++ = '\0';
205			if (!userhost[0]) {
206				fprintf(stderr, "Missing username\n");
207				usage();
208			}
209			addargs(&args, "-l%s",userhost);
210		}
211
212		host = cleanhostname(host);
213		if (!*host) {
214			fprintf(stderr, "Missing hostname\n");
215			usage();
216		}
217
218		addargs(&args, "-oProtocol %d", sshver);
219
220		/* no subsystem if the server-spec contains a '/' */
221		if (sftp_server == NULL || strchr(sftp_server, '/') == NULL)
222			addargs(&args, "-s");
223
224		addargs(&args, "%s", host);
225		addargs(&args, "%s", (sftp_server != NULL ?
226		    sftp_server : "sftp"));
227		args.list[0] = ssh_program;
228
229		fprintf(stderr, "Connecting to %s...\n", host);
230		connect_to_server(ssh_program, args.list, &in, &out,
231		    &sshpid);
232	} else {
233		args.list = NULL;
234		addargs(&args, "sftp-server");
235
236		fprintf(stderr, "Attaching to %s...\n", sftp_direct);
237		connect_to_server(sftp_direct, args.list, &in, &out,
238		    &sshpid);
239	}
240
241	interactive_loop(in, out, file1, file2);
242
243#if !defined(USE_PIPES)
244	shutdown(in, SHUT_RDWR);
245	shutdown(out, SHUT_RDWR);
246#endif
247
248	close(in);
249	close(out);
250	if (infile != stdin)
251		fclose(infile);
252
253	while (waitpid(sshpid, NULL, 0) == -1)
254		if (errno != EINTR)
255			fatal("Couldn't wait for ssh process: %s",
256			    strerror(errno));
257
258	exit(0);
259}
260