install.c revision 329183 
1/*-
2 * Copyright (c) 2008-2014, Juniper Networks, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/stand/common/install.c 329183 2018-02-12 20:51:28Z kevans $");
29
30#include <sys/param.h>
31#include <sys/socket.h>
32#include <net/if.h>
33#include <netinet/in.h>
34#include <netinet/in_systm.h>
35
36#include <stand.h>
37#include <net.h>
38#include <string.h>
39
40#include "bootstrap.h"
41
42extern struct in_addr servip;
43
44extern int pkgfs_init(const char *, struct fs_ops *);
45extern void pkgfs_cleanup(void);
46
47COMMAND_SET(install, "install", "install software package", command_install);
48
49static char *inst_kernel;
50static char **inst_modules;
51static char *inst_rootfs;
52static char *inst_loader_rc;
53
54static int
55setpath(char **what, char *val)
56{
57	char *path;
58	size_t len;
59	int rel;
60
61	len = strlen(val) + 1;
62	rel = (val[0] != '/') ? 1 : 0;
63	path = malloc(len + rel);
64	if (path == NULL)
65		return (ENOMEM);
66	path[0] = '/';
67	strcpy(path + rel, val);
68
69	*what = path;
70	return (0);
71}
72
73static int
74setmultipath(char ***what, char *val)
75{
76	char *s, *v;
77	int count, error, idx;
78
79	count = 0;
80	v = val;
81	do {
82		count++;
83		s = strchr(v, ',');
84		v = (s == NULL) ? NULL : s + 1;
85	} while (v != NULL);
86
87	*what = calloc(count + 1, sizeof(char *));
88	if (*what == NULL)
89		return (ENOMEM);
90
91	for (idx = 0; idx < count; idx++) {
92		s = strchr(val, ',');
93		if (s != NULL)
94			*s++ = '\0';
95		error = setpath(*what + idx, val);
96		if (error)
97			return (error);
98		val = s;
99	}
100
101	return (0);
102}
103
104static int
105read_metatags(int fd)
106{
107	char buf[1024];
108	char *p, *tag, *val;
109	ssize_t fsize;
110	int error;
111
112	fsize = read(fd, buf, sizeof(buf));
113	if (fsize == -1)
114		return (errno);
115
116	/*
117	 * Assume that if we read a whole buffer worth of data, we
118	 * haven't read the entire file. In other words, the buffer
119	 * size must always be larger than the file size. That way
120	 * we can append a '\0' and use standard string operations.
121	 * Return an error if this is not possible.
122	 */
123	if (fsize == sizeof(buf))
124		return (ENOMEM);
125
126	buf[fsize] = '\0';
127	error = 0;
128	tag = buf;
129	while (!error && *tag != '\0') {
130		val = strchr(tag, '=');
131		if (val == NULL) {
132			error = EINVAL;
133			break;
134		}
135		*val++ = '\0';
136		p = strchr(val, '\n');
137		if (p == NULL) {
138			error = EINVAL;
139			break;
140		}
141		*p++ = '\0';
142
143		if (strcmp(tag, "KERNEL") == 0)
144			error = setpath(&inst_kernel, val);
145		else if (strcmp(tag, "MODULES") == 0)
146			error = setmultipath(&inst_modules, val);
147		else if (strcmp(tag, "ROOTFS") == 0)
148			error = setpath(&inst_rootfs, val);
149		else if (strcmp(tag, "LOADER_RC") == 0)
150			error = setpath(&inst_loader_rc, val);
151
152		tag = p;
153	}
154
155	return (error);
156}
157
158static void
159cleanup(void)
160{
161	u_int i;
162
163	if (inst_kernel != NULL) {
164		free(inst_kernel);
165		inst_kernel = NULL;
166	}
167	if (inst_modules != NULL) {
168		i = 0;
169		while (inst_modules[i] != NULL)
170			free(inst_modules[i++]);
171		free(inst_modules);
172		inst_modules = NULL;
173	}
174	if (inst_rootfs != NULL) {
175		free(inst_rootfs);
176		inst_rootfs = NULL;
177	}
178	if (inst_loader_rc != NULL) {
179		free(inst_loader_rc);
180		inst_loader_rc = NULL;
181	}
182	pkgfs_cleanup();
183}
184
185/*
186 * usage: install URL
187 * where: URL = (tftp|file)://[host]/<package>
188 */
189static int
190install(char *pkgname)
191{
192	static char buf[256];
193	struct fs_ops *proto;
194	struct preloaded_file *fp;
195	char *s, *currdev;
196	const char *devname;
197	int error, fd, i, local;
198
199	s = strstr(pkgname, "://");
200	if (s == NULL)
201		goto invalid_url;
202
203	i = s - pkgname;
204	if (i == 4 && !strncasecmp(pkgname, "tftp", i)) {
205		devname = "net0";
206		proto = &tftp_fsops;
207		local = 0;
208	} else if (i == 4 && !strncasecmp(pkgname, "file", i)) {
209		currdev = getenv("currdev");
210		if (currdev != NULL && strcmp(currdev, "pxe0:") == 0) {
211			devname = "pxe0";
212			proto = NULL;
213		} else {
214			devname = "disk1";
215			proto = &dosfs_fsops;
216		}
217		local = 1;
218	} else
219		goto invalid_url;
220
221	s += 3;
222	if (*s == '\0')
223		goto invalid_url;
224
225	if (*s != '/' ) {
226		if (local)
227			goto invalid_url;
228
229		pkgname = strchr(s, '/');
230		if (pkgname == NULL)
231			goto invalid_url;
232
233		*pkgname = '\0';
234		servip.s_addr = inet_addr(s);
235		if (servip.s_addr == htonl(INADDR_NONE))
236			goto invalid_url;
237
238		setenv("serverip", inet_ntoa(servip), 1);
239
240		*pkgname = '/';
241	} else
242		pkgname = s;
243
244	if (strlen(devname) + strlen(pkgname) + 2 > sizeof(buf)) {
245		command_errmsg = "package name too long";
246		return (CMD_ERROR);
247	}
248	sprintf(buf, "%s:%s", devname, pkgname);
249	setenv("install_package", buf, 1);
250
251	error = pkgfs_init(buf, proto);
252	if (error) {
253		command_errmsg = "cannot open package";
254		goto fail;
255	}
256
257	/*
258	 * Point of no return: unload anything that may have been
259	 * loaded and prune the environment from harmful variables.
260	 */
261	unload();
262	unsetenv("vfs.root.mountfrom");
263
264	/*
265	 * read the metatags file.
266	 */
267	fd = open("/metatags", O_RDONLY);
268	if (fd != -1) {
269		error = read_metatags(fd);
270		close(fd);
271		if (error) {
272			command_errmsg = "cannot load metatags";
273			goto fail;
274		}
275	}
276
277	s = (inst_kernel == NULL) ? "/kernel" : inst_kernel;
278	error = mod_loadkld(s, 0, NULL);
279	if (error) {
280		command_errmsg = "cannot load kernel from package";
281		goto fail;
282	}
283
284	/* If there is a loader.rc in the package, execute it */
285	s = (inst_loader_rc == NULL) ? "/loader.rc" : inst_loader_rc;
286	fd = open(s, O_RDONLY);
287	if (fd != -1) {
288		close(fd);
289		error = inter_include(s);
290		if (error == CMD_ERROR)
291			goto fail;
292	}
293
294	i = 0;
295	while (inst_modules != NULL && inst_modules[i] != NULL) {
296		error = mod_loadkld(inst_modules[i], 0, NULL);
297		if (error) {
298			command_errmsg = "cannot load module(s) from package";
299			goto fail;
300		}
301		i++;
302	}
303
304	s = (inst_rootfs == NULL) ? "/install.iso" : inst_rootfs;
305	if (file_loadraw(s, "mfs_root", 1) == NULL) {
306		error = errno;
307		command_errmsg = "cannot load root file system";
308		goto fail;
309	}
310
311	cleanup();
312
313	fp = file_findfile(NULL, NULL);
314	if (fp != NULL)
315		file_formats[fp->f_loader]->l_exec(fp);
316	error = CMD_ERROR;
317	command_errmsg = "unable to start installation";
318
319 fail:
320	sprintf(buf, "%s (error %d)", command_errmsg, error);
321	cleanup();
322	unload();
323	exclusive_file_system = NULL;
324	command_errmsg = buf;	/* buf is static. */
325	return (CMD_ERROR);
326
327 invalid_url:
328	command_errmsg = "invalid URL";
329	return (CMD_ERROR);
330}
331
332static int
333command_install(int argc, char *argv[])
334{
335	int argidx;
336
337	unsetenv("install_format");
338
339	argidx = 1;
340	while (1) {
341		if (argc == argidx) {
342			command_errmsg =
343			    "usage: install [--format] <URL>";
344			return (CMD_ERROR);
345		}
346		if (!strcmp(argv[argidx], "--format")) {
347			setenv("install_format", "yes", 1);
348			argidx++;
349			continue;
350		}
351		break;
352	}
353
354	return (install(argv[argidx]));
355}
356