pkg.c revision 246790 
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 246790 2013-02-14 12:42:09Z 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#include "dns_utils.h"
52
53#define _LOCALBASE "/usr/local"
54#define _PKGS_URL "http://pkg.FreeBSD.org"
55
56static const char *
57elf_corres_to_string(struct _elf_corres *m, int e)
58{
59	int i;
60
61	for (i = 0; m[i].string != NULL; i++)
62		if (m[i].elf_nb == e)
63			return (m[i].string);
64
65	return ("unknown");
66}
67
68static int
69pkg_get_myabi(char *dest, size_t sz)
70{
71	Elf *elf;
72	Elf_Data *data;
73	Elf_Note note;
74	Elf_Scn *scn;
75	char *src, *osname;
76	const char *abi;
77	GElf_Ehdr elfhdr;
78	GElf_Shdr shdr;
79	int fd, i, ret;
80	uint32_t version;
81
82	version = 0;
83	ret = -1;
84	scn = NULL;
85	abi = NULL;
86
87	if (elf_version(EV_CURRENT) == EV_NONE) {
88		warnx("ELF library initialization failed: %s",
89		    elf_errmsg(-1));
90		return (-1);
91	}
92
93	if ((fd = open("/bin/sh", O_RDONLY)) < 0) {
94		warn("open()");
95		return (-1);
96	}
97
98	if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
99		ret = -1;
100		warnx("elf_begin() failed: %s.", elf_errmsg(-1));
101		goto cleanup;
102	}
103
104	if (gelf_getehdr(elf, &elfhdr) == NULL) {
105		ret = -1;
106		warn("getehdr() failed: %s.", elf_errmsg(-1));
107		goto cleanup;
108	}
109
110	while ((scn = elf_nextscn(elf, scn)) != NULL) {
111		if (gelf_getshdr(scn, &shdr) != &shdr) {
112			ret = -1;
113			warn("getshdr() failed: %s.", elf_errmsg(-1));
114			goto cleanup;
115		}
116
117		if (shdr.sh_type == SHT_NOTE)
118			break;
119	}
120
121	if (scn == NULL) {
122		ret = -1;
123		warn("failed to get the note section");
124		goto cleanup;
125	}
126
127	data = elf_getdata(scn, NULL);
128	src = data->d_buf;
129	for (;;) {
130		memcpy(&note, src, sizeof(Elf_Note));
131		src += sizeof(Elf_Note);
132		if (note.n_type == NT_VERSION)
133			break;
134		src += note.n_namesz + note.n_descsz;
135	}
136	osname = src;
137	src += note.n_namesz;
138	if (elfhdr.e_ident[EI_DATA] == ELFDATA2MSB)
139		version = be32dec(src);
140	else
141		version = le32dec(src);
142
143	for (i = 0; osname[i] != '\0'; i++)
144		osname[i] = (char)tolower(osname[i]);
145
146	snprintf(dest, sz, "%s:%d:%s:%s",
147	    osname, version / 100000,
148	    elf_corres_to_string(mach_corres, (int)elfhdr.e_machine),
149	    elf_corres_to_string(wordsize_corres,
150	    (int)elfhdr.e_ident[EI_CLASS]));
151
152	ret = 0;
153
154	switch (elfhdr.e_machine) {
155	case EM_ARM:
156		snprintf(dest + strlen(dest), sz - strlen(dest),
157		    ":%s:%s:%s", elf_corres_to_string(endian_corres,
158		    (int)elfhdr.e_ident[EI_DATA]),
159		    (elfhdr.e_flags & EF_ARM_NEW_ABI) > 0 ?
160		    "eabi" : "oabi",
161		    (elfhdr.e_flags & EF_ARM_VFP_FLOAT) > 0 ?
162		    "softfp" : "vfp");
163		break;
164	case EM_MIPS:
165		/*
166		 * this is taken from binutils sources:
167		 * include/elf/mips.h
168		 * mapping is figured out from binutils:
169		 * gas/config/tc-mips.c
170		 */
171		switch (elfhdr.e_flags & EF_MIPS_ABI) {
172		case E_MIPS_ABI_O32:
173			abi = "o32";
174			break;
175		case E_MIPS_ABI_N32:
176			abi = "n32";
177			break;
178		default:
179			if (elfhdr.e_ident[EI_DATA] ==
180			    ELFCLASS32)
181				abi = "o32";
182			else if (elfhdr.e_ident[EI_DATA] ==
183			    ELFCLASS64)
184				abi = "n64";
185			break;
186		}
187		snprintf(dest + strlen(dest), sz - strlen(dest),
188		    ":%s:%s", elf_corres_to_string(endian_corres,
189		    (int)elfhdr.e_ident[EI_DATA]), abi);
190		break;
191	}
192
193cleanup:
194	if (elf != NULL)
195		elf_end(elf);
196
197	close(fd);
198	return (ret);
199}
200
201static int
202extract_pkg_static(int fd, char *p, int sz)
203{
204	struct archive *a;
205	struct archive_entry *ae;
206	char *end;
207	int ret, r;
208
209	ret = -1;
210	a = archive_read_new();
211	if (a == NULL) {
212		warn("archive_read_new");
213		return (ret);
214	}
215	archive_read_support_compression_all(a);
216	archive_read_support_format_tar(a);
217
218	if (lseek(fd, 0, 0) == -1) {
219		warn("lseek");
220		goto cleanup;
221	}
222
223	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
224		warnx("archive_read_open_fd: %s", archive_error_string(a));
225		goto cleanup;
226	}
227
228	ae = NULL;
229	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
230		end = strrchr(archive_entry_pathname(ae), '/');
231		if (end == NULL)
232			continue;
233
234		if (strcmp(end, "/pkg-static") == 0) {
235			r = archive_read_extract(a, ae,
236			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
237			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
238			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
239			strlcpy(p, archive_entry_pathname(ae), sz);
240			break;
241		}
242	}
243
244	if (r == ARCHIVE_OK)
245		ret = 0;
246	else
247		warnx("fail to extract pkg-static");
248
249cleanup:
250	archive_read_finish(a);
251	return (ret);
252
253}
254
255static int
256install_pkg_static(char *path, char *pkgpath)
257{
258	int pstat;
259	pid_t pid;
260
261	switch ((pid = fork())) {
262	case -1:
263		return (-1);
264	case 0:
265		execl(path, "pkg-static", "add", pkgpath, (char *)NULL);
266		_exit(1);
267	default:
268		break;
269	}
270
271	while (waitpid(pid, &pstat, 0) == -1)
272		if (errno != EINTR)
273			return (-1);
274
275	if (WEXITSTATUS(pstat))
276		return (WEXITSTATUS(pstat));
277	else if (WIFSIGNALED(pstat))
278		return (128 & (WTERMSIG(pstat)));
279	return (pstat);
280}
281
282static int
283bootstrap_pkg(void)
284{
285	struct url *u;
286	FILE *remote;
287	FILE *config;
288	char *site;
289	struct dns_srvinfo *mirrors, *current;
290	/* To store _https._tcp. + hostname + \0 */
291	char zone[MAXHOSTNAMELEN + 13];
292	char url[MAXPATHLEN];
293	char conf[MAXPATHLEN];
294	char abi[BUFSIZ];
295	char tmppkg[MAXPATHLEN];
296	char buf[10240];
297	char pkgstatic[MAXPATHLEN];
298	int fd, retry, ret, max_retry;
299	struct url_stat st;
300	off_t done, r;
301	time_t now;
302	time_t last;
303
304	done = 0;
305	last = 0;
306	max_retry = 3;
307	ret = -1;
308	remote = NULL;
309	config = NULL;
310	current = mirrors = NULL;
311
312	printf("Bootstrapping pkg please wait\n");
313
314	if (pkg_get_myabi(abi, MAXPATHLEN) != 0) {
315		warnx("failed to determine the system ABI");
316		return (-1);
317	}
318
319	if (getenv("PACKAGESITE") != NULL)
320		snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", getenv("PACKAGESITE"));
321	else
322		snprintf(url, MAXPATHLEN, "%s/%s/latest/Latest/pkg.txz",
323		    getenv("PACKAGEROOT") ? getenv("PACKAGEROOT") : _PKGS_URL,
324		    getenv("ABI") ? getenv("ABI") : abi);
325
326	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
327	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
328
329	if ((fd = mkstemp(tmppkg)) == -1) {
330		warn("mkstemp()");
331		return (-1);
332	}
333
334	retry = max_retry;
335
336	u = fetchParseURL(url);
337	while (remote == NULL) {
338		if (retry == max_retry) {
339			if (strcmp(u->scheme, "file") != 0) {
340				snprintf(zone, sizeof(zone),
341				    "_%s._tcp.%s", u->scheme, u->host);
342				printf("%s\n", zone);
343				mirrors = dns_getsrvinfo(zone);
344				current = mirrors;
345			}
346		}
347
348		if (mirrors != NULL)
349			strlcpy(u->host, current->host, sizeof(u->host));
350
351		remote = fetchXGet(u, &st, "");
352		if (remote == NULL) {
353			--retry;
354			if (retry <= 0)
355				goto fetchfail;
356			if (mirrors == NULL) {
357				sleep(1);
358			} else {
359				current = current->next;
360				if (current == NULL)
361					current = mirrors;
362			}
363		}
364	}
365
366	if (remote == NULL)
367		goto fetchfail;
368
369	while (done < st.size) {
370		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
371			break;
372
373		if (write(fd, buf, r) != r) {
374			warn("write()");
375			goto cleanup;
376		}
377
378		done += r;
379		now = time(NULL);
380		if (now > last || done == st.size)
381			last = now;
382	}
383
384	if (ferror(remote))
385		goto fetchfail;
386
387	if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
388		ret = install_pkg_static(pkgstatic, tmppkg);
389
390	snprintf(conf, MAXPATHLEN, "%s/etc/pkg.conf",
391	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
392
393	if (access(conf, R_OK) == -1) {
394		site = strrchr(url, '/');
395		if (site == NULL)
396			goto cleanup;
397		site[0] = '\0';
398		site = strrchr(url, '/');
399		if (site == NULL)
400			goto cleanup;
401		site[0] = '\0';
402
403		config = fopen(conf, "w+");
404		if (config == NULL)
405			goto cleanup;
406		fprintf(config, "packagesite: %s\n", url);
407		fclose(config);
408	}
409
410	goto cleanup;
411
412fetchfail:
413	warnx("Error fetching %s: %s", url, fetchLastErrString);
414	fprintf(stderr, "A pre-built version of pkg could not be found for your system.\n");
415	fprintf(stderr, "Consider changing PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.\n");
416
417cleanup:
418	if (remote != NULL)
419		fclose(remote);
420	close(fd);
421	unlink(tmppkg);
422
423	return (ret);
424}
425
426static const char confirmation_message[] =
427"The package management tool is not yet installed on your system.\n"
428"Do you want to fetch and install it now? [y/N]: ";
429
430static int
431pkg_query_yes_no(void)
432{
433	int ret, c;
434
435	c = getchar();
436
437	if (c == 'y' || c == 'Y')
438		ret = 1;
439	else
440		ret = 0;
441
442	while (c != '\n' && c != EOF)
443		c = getchar();
444
445	return (ret);
446}
447
448int
449main(__unused int argc, char *argv[])
450{
451	char pkgpath[MAXPATHLEN];
452
453	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
454	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
455
456	if (access(pkgpath, X_OK) == -1) {
457		/*
458		 * To allow 'pkg -N' to be used as a reliable test for whether
459		 * a system is configured to use pkg, don't bootstrap pkg
460		 * when that argument is given as argv[1].
461		 */
462		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
463			errx(EXIT_FAILURE, "pkg is not installed");
464
465		/*
466		 * Do not ask for confirmation if either of stdin or stdout is
467		 * not tty. Check the environment to see if user has answer
468		 * tucked in there already.
469		 */
470		if (getenv("ASSUME_ALWAYS_YES") == NULL) {
471			printf("%s", confirmation_message);
472			if (!isatty(fileno(stdin)))
473				exit(EXIT_FAILURE);
474
475			if (pkg_query_yes_no() == 0)
476				exit(EXIT_FAILURE);
477		}
478		if (bootstrap_pkg() != 0)
479			exit(EXIT_FAILURE);
480	}
481
482	execv(pkgpath, argv);
483
484	/* NOT REACHED */
485	return (EXIT_FAILURE);
486}
487