pkg.c revision 234351 
1/*-
2 * Copyright (c) 2012 Baptiste Daroussin <bapt@FreeBSD.org>
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 AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, 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: head/usr.sbin/pkg/pkg.c 234351 2012-04-16 20:41:25Z bapt $");
29
30#include <sys/param.h>
31#include <sys/elf_common.h>
32#include <sys/endian.h>
33#include <sys/wait.h>
34
35#include <archive.h>
36#include <archive_entry.h>
37#include <ctype.h>
38#include <err.h>
39#include <errno.h>
40#include <fcntl.h>
41#include <fetch.h>
42#include <gelf.h>
43#include <paths.h>
44#include <stdlib.h>
45#include <stdio.h>
46#include <string.h>
47#include <time.h>
48#include <unistd.h>
49
50#include "elf_tables.h"
51
52#define _LOCALBASE "/usr/local"
53#define _PKGS_URL "http://pkgbeta.FreeBSD.org"
54
55static const char *
56elf_corres_to_string(struct _elf_corres *m, int e)
57{
58	int i;
59
60	for (i = 0; m[i].string != NULL; i++)
61		if (m[i].elf_nb == e)
62			return (m[i].string);
63
64	return ("unknown");
65}
66
67static int
68pkg_get_myabi(char *dest, size_t sz)
69{
70	Elf *elf;
71	Elf_Data *data;
72	Elf_Note note;
73	Elf_Scn *scn;
74	char *src, *osname;
75	const char *abi;
76	GElf_Ehdr elfhdr;
77	GElf_Shdr shdr;
78	int fd, i, ret;
79	uint32_t version;
80
81	version = 0;
82	ret = -1;
83	scn = NULL;
84	abi = NULL;
85
86	if (elf_version(EV_CURRENT) == EV_NONE) {
87		warnx("ELF library initialization failed: %s",
88		    elf_errmsg(-1));
89		return (-1);
90	}
91
92	if ((fd = open("/bin/sh", O_RDONLY)) < 0) {
93		warn("open()");
94		return (-1);
95	}
96
97	if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
98		ret = -1;
99		warnx("elf_begin() failed: %s.", elf_errmsg(-1));
100		goto cleanup;
101	}
102
103	if (gelf_getehdr(elf, &elfhdr) == NULL) {
104		ret = -1;
105		warn("getehdr() failed: %s.", elf_errmsg(-1));
106		goto cleanup;
107	}
108
109	while ((scn = elf_nextscn(elf, scn)) != NULL) {
110		if (gelf_getshdr(scn, &shdr) != &shdr) {
111			ret = -1;
112			warn("getshdr() failed: %s.", elf_errmsg(-1));
113			goto cleanup;
114		}
115
116		if (shdr.sh_type == SHT_NOTE)
117			break;
118	}
119
120	if (scn == NULL) {
121		ret = -1;
122		warn("failed to get the note section");
123		goto cleanup;
124	}
125
126	data = elf_getdata(scn, NULL);
127	src = data->d_buf;
128	for (;;) {
129		memcpy(&note, src, sizeof(Elf_Note));
130		src += sizeof(Elf_Note);
131		if (note.n_type == NT_VERSION)
132			break;
133		src += note.n_namesz + note.n_descsz;
134	}
135	osname = src;
136	src += note.n_namesz;
137	if (elfhdr.e_ident[EI_DATA] == ELFDATA2MSB)
138		version = be32dec(src);
139	else
140		version = le32dec(src);
141
142	for (i = 0; osname[i] != '\0'; i++)
143		osname[i] = (char)tolower(osname[i]);
144
145	snprintf(dest, sz, "%s:%d:%s:%s",
146	    osname, version / 100000,
147	    elf_corres_to_string(mach_corres, (int)elfhdr.e_machine),
148	    elf_corres_to_string(wordsize_corres,
149	    (int)elfhdr.e_ident[EI_CLASS]));
150
151	ret = 0;
152
153	switch (elfhdr.e_machine) {
154	case EM_ARM:
155		snprintf(dest + strlen(dest), sz - strlen(dest),
156		    ":%s:%s:%s", elf_corres_to_string(endian_corres,
157		    (int)elfhdr.e_ident[EI_DATA]),
158		    (elfhdr.e_flags & EF_ARM_NEW_ABI) > 0 ?
159		    "eabi" : "oabi",
160		    (elfhdr.e_flags & EF_ARM_VFP_FLOAT) > 0 ?
161		    "softfp" : "vfp");
162		break;
163	case EM_MIPS:
164		/*
165		 * this is taken from binutils sources:
166		 * include/elf/mips.h
167		 * mapping is figured out from binutils:
168		 * gas/config/tc-mips.c
169		 */
170		switch (elfhdr.e_flags & EF_MIPS_ABI) {
171		case E_MIPS_ABI_O32:
172			abi = "o32";
173			break;
174		case E_MIPS_ABI_N32:
175			abi = "n32";
176			break;
177		default:
178			if (elfhdr.e_ident[EI_DATA] ==
179			    ELFCLASS32)
180				abi = "o32";
181			else if (elfhdr.e_ident[EI_DATA] ==
182			    ELFCLASS64)
183				abi = "n64";
184			break;
185		}
186		snprintf(dest + strlen(dest), sz - strlen(dest),
187		    ":%s:%s", elf_corres_to_string(endian_corres,
188		    (int)elfhdr.e_ident[EI_DATA]), abi);
189		break;
190	}
191
192cleanup:
193	if (elf != NULL)
194		elf_end(elf);
195
196	close(fd);
197	return (ret);
198}
199
200static int
201extract_pkg_static(int fd, char *p, int sz)
202{
203	struct archive *a;
204	struct archive_entry *ae;
205	char *end;
206	int ret, r;
207
208	ret = -1;
209	a = archive_read_new();
210	if (a == NULL) {
211		warn("archive_read_new");
212		return (ret);
213	}
214	archive_read_support_compression_all(a);
215	archive_read_support_format_tar(a);
216
217	if (lseek(fd, 0, 0) == -1) {
218		warn("lseek");
219		goto cleanup;
220	}
221
222	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
223		warnx("archive_read_open_fd: %s", archive_error_string(a));
224		goto cleanup;
225	}
226
227	ae = NULL;
228	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
229		end = strrchr(archive_entry_pathname(ae), '/');
230		if (end == NULL)
231			continue;
232
233		if (strcmp(end, "/pkg-static") == 0) {
234			r = archive_read_extract(a, ae,
235			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
236			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
237			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
238			strlcpy(p, archive_entry_pathname(ae), sz);
239			break;
240		}
241	}
242
243	if (r == ARCHIVE_OK)
244		ret = 0;
245	else
246		warnx("fail to extract pkg-static");
247
248cleanup:
249	archive_read_finish(a);
250	return (ret);
251
252}
253
254static int
255install_pkg_static(char *path, char *pkgpath)
256{
257	int pstat;
258	pid_t pid;
259
260	switch ((pid = fork())) {
261	case -1:
262		return (-1);
263	case 0:
264		execl(path, "pkg-static", "add", pkgpath, (char *)NULL);
265		_exit(1);
266	default:
267		break;
268	}
269
270	while (waitpid(pid, &pstat, 0) == -1)
271		if (errno != EINTR)
272			return (-1);
273
274	if (WEXITSTATUS(pstat))
275		return (WEXITSTATUS(pstat));
276	else if (WIFSIGNALED(pstat))
277		return (128 & (WTERMSIG(pstat)));
278	return (pstat);
279}
280
281static int
282bootstrap_pkg(void)
283{
284	FILE *remote;
285	char url[MAXPATHLEN];
286	char abi[BUFSIZ];
287	char tmppkg[MAXPATHLEN];
288	char buf[10240];
289	char pkgstatic[MAXPATHLEN];
290	int fd, retry, ret;
291	struct url_stat st;
292	off_t done, r;
293	time_t begin_dl;
294	time_t now;
295	time_t last;
296
297	done = 0;
298	last = 0;
299	ret = -1;
300	remote = NULL;
301
302	printf("Bootstrapping pkg please wait\n");
303
304	if (pkg_get_myabi(abi, MAXPATHLEN) != 0) {
305		warnx("failed to determine the system ABI");
306		return (-1);
307	}
308
309	if (getenv("PACKAGESITE") != NULL)
310		snprintf(url, MAXPATHLEN, "%s/pkg.txz", getenv("PACKAGESITE"));
311	else
312		snprintf(url, MAXPATHLEN, "%s/%s/latest/Latest/pkg.txz",
313		    getenv("PACKAGEROOT") ? getenv("PACKAGEROOT") : _PKGS_URL,
314		    getenv("ABI") ? getenv("ABI") : abi);
315
316	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
317	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
318
319	if ((fd = mkstemp(tmppkg)) == -1) {
320		warn("mkstemp()");
321		return (-1);
322	}
323
324	retry = 3;
325	do {
326		remote = fetchXGetURL(url, &st, "");
327		if (remote == NULL)
328			sleep(1);
329	} while (remote == NULL && retry-- > 0);
330
331	if (remote == NULL)
332		goto fetchfail;
333
334	begin_dl = time(NULL);
335	while (done < st.size) {
336		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
337			break;
338
339		if (write(fd, buf, r) != r) {
340			warn("write()");
341			goto cleanup;
342		}
343
344		done += r;
345		now = time(NULL);
346		if (now > last || done == st.size)
347			last = now;
348	}
349
350	if (ferror(remote))
351		goto fetchfail;
352
353	if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
354		ret = install_pkg_static(pkgstatic, tmppkg);
355
356	goto cleanup;
357
358fetchfail:
359	warnx("Error fetching %s: %s", url, fetchLastErrString);
360
361cleanup:
362	close(fd);
363	unlink(tmppkg);
364
365	return (ret);
366}
367
368int
369main(__unused int argc, char *argv[])
370{
371	char pkgpath[MAXPATHLEN];
372
373	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
374	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
375
376	if (access(pkgpath, X_OK) == -1)
377		if (bootstrap_pkg() != 0)
378			exit(EXIT_FAILURE);
379
380	execv(pkgpath, argv);
381
382	/* NOT REACHED */
383	return (EXIT_FAILURE);
384}
385