sftp.c revision 98937 
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 1.29 2002/04/02 17:37:48 markus 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#ifdef USE_PIPES
57	int pin[2], pout[2];
58	if ((pipe(pin) == -1) || (pipe(pout) == -1))
59		fatal("pipe: %s", strerror(errno));
60	*in = pin[0];
61	*out = pout[1];
62	c_in = pout[0];
63	c_out = pin[1];
64#else /* USE_PIPES */
65	int inout[2];
66	if (socketpair(AF_UNIX, SOCK_STREAM, 0, inout) == -1)
67		fatal("socketpair: %s", strerror(errno));
68	*in = *out = inout[0];
69	c_in = c_out = inout[1];
70#endif /* USE_PIPES */
71
72	if ((*sshpid = fork()) == -1)
73		fatal("fork: %s", strerror(errno));
74	else if (*sshpid == 0) {
75		if ((dup2(c_in, STDIN_FILENO) == -1) ||
76		    (dup2(c_out, STDOUT_FILENO) == -1)) {
77			fprintf(stderr, "dup2: %s\n", strerror(errno));
78			exit(1);
79		}
80		close(*in);
81		close(*out);
82		close(c_in);
83		close(c_out);
84		execv(path, args);
85		fprintf(stderr, "exec: %s: %s\n", path, strerror(errno));
86		exit(1);
87	}
88
89	close(c_in);
90	close(c_out);
91}
92
93static void
94usage(void)
95{
96	extern char *__progname;
97
98	fprintf(stderr,
99	    "usage: %s [-vC1] [-b batchfile] [-o option] [-s subsystem|path] [-B buffer_size]\n"
100	    "            [-F config] [-P direct server path] [-S program]\n"
101	    "            [user@]host[:file [file]]\n", __progname);
102	exit(1);
103}
104
105int
106main(int argc, char **argv)
107{
108	int in, out, ch;
109	pid_t sshpid;
110	char *host, *userhost, *cp, *file2;
111	int debug_level = 0, sshver = 2;
112	char *file1 = NULL, *sftp_server = NULL;
113	char *ssh_program = _PATH_SSH_PROGRAM, *sftp_direct = NULL;
114	LogLevel ll = SYSLOG_LEVEL_INFO;
115	arglist args;
116	extern int optind;
117	extern char *optarg;
118
119	__progname = get_progname(argv[0]);
120	args.list = NULL;
121	addargs(&args, "ssh");		/* overwritten with ssh_program */
122	addargs(&args, "-oFallBackToRsh no");
123	addargs(&args, "-oForwardX11 no");
124	addargs(&args, "-oForwardAgent no");
125	addargs(&args, "-oClearAllForwardings yes");
126	ll = SYSLOG_LEVEL_INFO;
127	infile = stdin;		/* Read from STDIN unless changed by -b */
128
129	while ((ch = getopt(argc, argv, "1hvCo:s:S:b:B:F:P:R:")) != -1) {
130		switch (ch) {
131		case 'C':
132			addargs(&args, "-C");
133			break;
134		case 'v':
135			if (debug_level < 3) {
136				addargs(&args, "-v");
137				ll = SYSLOG_LEVEL_DEBUG1 + debug_level;
138			}
139			debug_level++;
140			break;
141		case 'F':
142		case 'o':
143			addargs(&args, "-%c%s", ch, optarg);
144			break;
145		case '1':
146			sshver = 1;
147			if (sftp_server == NULL)
148				sftp_server = _PATH_SFTP_SERVER;
149			break;
150		case 's':
151			sftp_server = optarg;
152			break;
153		case 'S':
154			ssh_program = optarg;
155			break;
156		case 'b':
157			if (infile == stdin) {
158				infile = fopen(optarg, "r");
159				if (infile == NULL)
160					fatal("%s (%s).", strerror(errno), optarg);
161			} else
162				fatal("Filename already specified.");
163			break;
164		case 'P':
165			sftp_direct = optarg;
166			break;
167		case 'B':
168			copy_buffer_len = strtol(optarg, &cp, 10);
169			if (copy_buffer_len == 0 || *cp != '\0')
170				fatal("Invalid buffer size \"%s\"", optarg);
171			break;
172		case 'R':
173			num_requests = strtol(optarg, &cp, 10);
174			if (num_requests == 0 || *cp != '\0')
175				fatal("Invalid number of requests \"%s\"",
176				    optarg);
177			break;
178		case 'h':
179		default:
180			usage();
181		}
182	}
183
184	log_init(argv[0], ll, SYSLOG_FACILITY_USER, 1);
185
186	if (sftp_direct == NULL) {
187		if (optind == argc || argc > (optind + 2))
188			usage();
189
190		userhost = xstrdup(argv[optind]);
191		file2 = argv[optind+1];
192
193		if ((cp = colon(userhost)) != NULL) {
194			*cp++ = '\0';
195			file1 = cp;
196		}
197
198		if ((host = strchr(userhost, '@')) == NULL)
199			host = userhost;
200		else {
201			*host++ = '\0';
202			if (!userhost[0]) {
203				fprintf(stderr, "Missing username\n");
204				usage();
205			}
206			addargs(&args, "-l%s",userhost);
207		}
208
209		host = cleanhostname(host);
210		if (!*host) {
211			fprintf(stderr, "Missing hostname\n");
212			usage();
213		}
214
215		addargs(&args, "-oProtocol %d", sshver);
216
217		/* no subsystem if the server-spec contains a '/' */
218		if (sftp_server == NULL || strchr(sftp_server, '/') == NULL)
219			addargs(&args, "-s");
220
221		addargs(&args, "%s", host);
222		addargs(&args, "%s", (sftp_server != NULL ?
223		    sftp_server : "sftp"));
224		args.list[0] = ssh_program;
225
226		fprintf(stderr, "Connecting to %s...\n", host);
227		connect_to_server(ssh_program, args.list, &in, &out,
228		    &sshpid);
229	} else {
230		args.list = NULL;
231		addargs(&args, "sftp-server");
232
233		fprintf(stderr, "Attaching to %s...\n", sftp_direct);
234		connect_to_server(sftp_direct, args.list, &in, &out,
235		    &sshpid);
236	}
237
238	interactive_loop(in, out, file1, file2);
239
240#if !defined(USE_PIPES)
241	shutdown(in, SHUT_RDWR);
242	shutdown(out, SHUT_RDWR);
243#endif
244
245	close(in);
246	close(out);
247	if (infile != stdin)
248		fclose(infile);
249
250	while (waitpid(sshpid, NULL, 0) == -1)
251		if (errno != EINTR)
252			fatal("Couldn't wait for ssh process: %s",
253			    strerror(errno));
254
255	exit(0);
256}
257