xref: /freebsd/usr.sbin/pkg/pkg.c (revision 3b3a8eb937bf8045231e8364bfd1b94cd4a95979)
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("$FreeBSD$");
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 
55 static const char *
56 elf_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 
67 static int
68 pkg_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 
192 cleanup:
193 	if (elf != NULL)
194 		elf_end(elf);
195 
196 	close(fd);
197 	return (ret);
198 }
199 
200 static int
201 extract_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 
248 cleanup:
249 	archive_read_finish(a);
250 	return (ret);
251 
252 }
253 
254 static int
255 install_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 
281 static int
282 bootstrap_pkg(void)
283 {
284 	FILE *remote;
285 	FILE *config;
286 	char *site;
287 	char url[MAXPATHLEN];
288 	char conf[MAXPATHLEN];
289 	char abi[BUFSIZ];
290 	char tmppkg[MAXPATHLEN];
291 	char buf[10240];
292 	char pkgstatic[MAXPATHLEN];
293 	int fd, retry, ret;
294 	struct url_stat st;
295 	off_t done, r;
296 	time_t now;
297 	time_t last;
298 
299 	done = 0;
300 	last = 0;
301 	ret = -1;
302 	remote = NULL;
303 	config = NULL;
304 
305 	printf("Bootstrapping pkg please wait\n");
306 
307 	if (pkg_get_myabi(abi, MAXPATHLEN) != 0) {
308 		warnx("failed to determine the system ABI");
309 		return (-1);
310 	}
311 
312 	if (getenv("PACKAGESITE") != NULL)
313 		snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", getenv("PACKAGESITE"));
314 	else
315 		snprintf(url, MAXPATHLEN, "%s/%s/latest/Latest/pkg.txz",
316 		    getenv("PACKAGEROOT") ? getenv("PACKAGEROOT") : _PKGS_URL,
317 		    getenv("ABI") ? getenv("ABI") : abi);
318 
319 	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
320 	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
321 
322 	if ((fd = mkstemp(tmppkg)) == -1) {
323 		warn("mkstemp()");
324 		return (-1);
325 	}
326 
327 	retry = 3;
328 	do {
329 		remote = fetchXGetURL(url, &st, "");
330 		if (remote == NULL)
331 			sleep(1);
332 	} while (remote == NULL && retry-- > 0);
333 
334 	if (remote == NULL)
335 		goto fetchfail;
336 
337 	while (done < st.size) {
338 		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
339 			break;
340 
341 		if (write(fd, buf, r) != r) {
342 			warn("write()");
343 			goto cleanup;
344 		}
345 
346 		done += r;
347 		now = time(NULL);
348 		if (now > last || done == st.size)
349 			last = now;
350 	}
351 
352 	if (ferror(remote))
353 		goto fetchfail;
354 
355 	if ((ret = extract_pkg_static(fd, pkgstatic, MAXPATHLEN)) == 0)
356 		ret = install_pkg_static(pkgstatic, tmppkg);
357 
358 	snprintf(conf, MAXPATHLEN, "%s/etc/pkg.conf",
359 	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
360 
361 	if (access(conf, R_OK) == -1) {
362 		site = strrchr(url, '/');
363 		if (site == NULL)
364 			goto cleanup;
365 		site[0] = '\0';
366 		site = strrchr(url, '/');
367 		if (site == NULL)
368 			goto cleanup;
369 		site[0] = '\0';
370 
371 		config = fopen(conf, "w+");
372 		if (config == NULL)
373 			goto cleanup;
374 		fprintf(config, "packagesite: %s\n", url);
375 		fclose(config);
376 	}
377 
378 	goto cleanup;
379 
380 fetchfail:
381 	warnx("Error fetching %s: %s", url, fetchLastErrString);
382 
383 cleanup:
384 	if (remote != NULL)
385 		fclose(remote);
386 	close(fd);
387 	unlink(tmppkg);
388 
389 	return (ret);
390 }
391 
392 static const char confirmation_message[] =
393 "The package management tool is not yet installed on your system.\n"
394 "Do you want to fetch and install it now? [y/N]: ";
395 
396 static int
397 pkg_query_yes_no(void)
398 {
399 	int ret, c;
400 
401 	c = getchar();
402 
403 	if (c == 'y' || c == 'Y')
404 		ret = 1;
405 	else
406 		ret = 0;
407 
408 	while (c != '\n' && c != EOF)
409 		c = getchar();
410 
411 	return (ret);
412 }
413 
414 int
415 main(__unused int argc, char *argv[])
416 {
417 	char pkgpath[MAXPATHLEN];
418 
419 	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
420 	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
421 
422 	if (access(pkgpath, X_OK) == -1) {
423 		/*
424 		 * Do not ask for confirmation if either of stdin or stdout is
425 		 * not tty. Check the environment to see if user has answer
426 		 * tucked in there already.
427 		 */
428 		if (getenv("ASSUME_ALWAYS_YES") == NULL) {
429 			printf("%s", confirmation_message);
430 			if (!isatty(fileno(stdin)))
431 				exit(EXIT_FAILURE);
432 
433 			if (pkg_query_yes_no() == 0)
434 				exit(EXIT_FAILURE);
435 		}
436 		if (bootstrap_pkg() != 0)
437 			exit(EXIT_FAILURE);
438 	}
439 
440 	execv(pkgpath, argv);
441 
442 	/* NOT REACHED */
443 	return (EXIT_FAILURE);
444 }
445