summaryrefslogtreecommitdiff
path: root/lib/libalpm/dload.c
blob: ef12646e97c5585df11337dcbf294d1651e86bdd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
/*
 *  download.c
 *
 *  Copyright (c) 2002-2008 by Judd Vinet <jvinet@zeroflux.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
/* the following two are needed on BSD for libfetch */
#if defined(HAVE_SYS_SYSLIMITS_H)
#include <sys/syslimits.h> /* PATH_MAX */
#endif
#if defined(HAVE_SYS_PARAM_H)
#include <sys/param.h> /* MAXHOSTNAMELEN */
#endif

#if defined(HAVE_LIBDOWNLOAD)
#include <download.h>
#elif defined(HAVE_LIBFETCH)
#include <fetch.h>
#define downloadFreeURL fetchFreeURL
#define downloadLastErrCode fetchLastErrCode
#define downloadLastErrString fetchLastErrString
#define downloadParseURL fetchParseURL
#define downloadTimeout fetchTimeout
#define downloadXGet fetchXGet
#endif

/* libalpm */
#include "dload.h"
#include "alpm_list.h"
#include "alpm.h"
#include "log.h"
#include "util.h"
#include "handle.h"

static char *get_filename(const char *url) {
	char *filename = strrchr(url, '/');
	if(filename != NULL) {
		filename++;
	}
	return(filename);
}

static char *get_destfile(const char *path, const char *filename) {
	char *destfile;
	/* len = localpath len + filename len + null */
	int len = strlen(path) + strlen(filename) + 1;
	CALLOC(destfile, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, NULL));
	snprintf(destfile, len, "%s%s", path, filename);

	return(destfile);
}

static char *get_tempfile(const char *path, const char *filename) {
	char *tempfile;
	/* len = localpath len + filename len + '.part' len + null */
	int len = strlen(path) + strlen(filename) + 6;
	CALLOC(tempfile, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, NULL));
	snprintf(tempfile, len, "%s%s.part", path, filename);

	return(tempfile);
}

#if defined(INTERNAL_DOWNLOAD)
/* Build a 'struct url' from an url. */
static struct url *url_for_string(const char *url)
{
	struct url *ret = NULL;
	ret = downloadParseURL(url);
	if(!ret) {
		_alpm_log(PM_LOG_ERROR, _("url '%s' is invalid\n"), url);
		RET_ERR(PM_ERR_SERVER_BAD_URL, NULL);
	}

	/* if no URL scheme specified, assume HTTP */
	if(strlen(ret->scheme) == 0) {
		_alpm_log(PM_LOG_WARNING, _("url scheme not specified, assuming HTTP\n"));
		strcpy(ret->scheme, SCHEME_HTTP);
	}
	/* add a user & password for anonymous FTP */
	if(strcmp(ret->scheme,SCHEME_FTP) == 0 && strlen(ret->user) == 0) {
		strcpy(ret->user, "anonymous");
		strcpy(ret->pwd, "libalpm@guest");
	}

	return(ret);
}

static int download_internal(const char *url, const char *localpath,
		time_t mtimeold, time_t *mtimenew) {
	FILE *dlf, *localf = NULL;
	struct url_stat ust;
	struct stat st;
	int chk_resume = 0;
	size_t dl_thisfile = 0;
	char *tempfile, *destfile, *filename;
	int ret = 0;
	struct url *fileurl = url_for_string(url);

	if(!fileurl) {
		return(-1);
	}

	filename = get_filename(url);
	if(!filename) {
		return(-1);
	}
	destfile = get_destfile(localpath, filename);
	tempfile = get_tempfile(localpath, filename);

	/* pass the raw filename for passing to the callback function */
	_alpm_log(PM_LOG_DEBUG, "using '%s' for download progress\n", filename);

	if(stat(tempfile, &st) == 0 && st.st_size > 0) {
		_alpm_log(PM_LOG_DEBUG, "existing file found, using it\n");
		fileurl->offset = (off_t)st.st_size;
		dl_thisfile = st.st_size;
		localf = fopen(tempfile, "ab");
		chk_resume = 1;
	} else {
		fileurl->offset = (off_t)0;
		dl_thisfile = 0;
	}

	/* libdownload does not reset the error code, reset it in
	 * the case of previous errors */
	downloadLastErrCode = 0;

	/* 10s timeout - TODO make a config option */
	downloadTimeout = 10000;

	dlf = downloadXGet(fileurl, &ust, (handle->nopassiveftp ? "" : "p"));

	if(downloadLastErrCode != 0 || dlf == NULL) {
		const char *host = _("disk");
		if(strcmp(SCHEME_FILE, fileurl->scheme) != 0) {
			host = fileurl->host;
		}
		pm_errno = PM_ERR_LIBDOWNLOAD;
		_alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"),
				filename, host, downloadLastErrString);
		ret = -1;
		goto cleanup;
	} else {
		_alpm_log(PM_LOG_DEBUG, "connected to %s successfully\n", fileurl->host);
	}

	if(ust.mtime && mtimeold && ust.mtime == mtimeold) {
		_alpm_log(PM_LOG_DEBUG, "mtimes are identical, skipping %s\n", filename);
		ret = 1;
		goto cleanup;
	}

	if(ust.mtime && mtimenew) {
		*mtimenew = ust.mtime;
	}

	if(chk_resume && fileurl->offset == 0) {
		_alpm_log(PM_LOG_WARNING, _("cannot resume download, starting over\n"));
		if(localf != NULL) {
			fclose(localf);
			localf = NULL;
		}
	}

	if(localf == NULL) {
		_alpm_rmrf(tempfile);
		fileurl->offset = (off_t)0;
		dl_thisfile = 0;
		localf = fopen(tempfile, "wb");
		if(localf == NULL) { /* still null? */
			_alpm_log(PM_LOG_ERROR, _("cannot write to file '%s'\n"), tempfile);
			ret = -1;
			goto cleanup;
		}
	}

	/* Progress 0 - initialize */
	if(handle->dlcb) {
		handle->dlcb(filename, 0, ust.size);
	}

	size_t nread = 0;
	char buffer[PM_DLBUF_LEN];
	while((nread = fread(buffer, 1, PM_DLBUF_LEN, dlf)) > 0) {
		if(ferror(dlf)) {
			pm_errno = PM_ERR_LIBDOWNLOAD;
			_alpm_log(PM_LOG_ERROR, _("error downloading '%s': %s\n"),
					filename, downloadLastErrString);
			ret = -1;
			goto cleanup;
		}

		size_t nwritten = 0;
		while(nwritten < nread) {
			nwritten += fwrite(buffer, 1, (nread - nwritten), localf);
			if(ferror(localf)) {
				_alpm_log(PM_LOG_ERROR, _("error writing to file '%s': %s\n"),
						destfile, strerror(errno));
				ret = -1;
				goto cleanup;
			}
		}
		dl_thisfile += nread;

		if(handle->dlcb) {
			handle->dlcb(filename, dl_thisfile, ust.size);
		}
	}
	/* probably safer to close the file descriptors now before renaming the file,
	 * for example to make sure the buffers are flushed.
	 */
	fclose(localf);
	localf = NULL;
	fclose(dlf);
	dlf = NULL;

	rename(tempfile, destfile);
	ret = 0;

cleanup:
	FREE(tempfile);
	FREE(destfile);
	if(localf != NULL) {
		fclose(localf);
	}
	if(dlf != NULL) {
		fclose(dlf);
	}
	downloadFreeURL(fileurl);
	return(ret);
}
#endif

static int download_external(const char *url, const char *localpath,
		time_t mtimeold, time_t *mtimenew) {
	int ret = 0;
	int retval;
	int usepart = 0;
	char *ptr1, *ptr2;
	char origCmd[PATH_MAX];
	char parsedCmd[PATH_MAX] = "";
	char cwd[PATH_MAX];
	char *destfile, *tempfile, *filename;

	if(!handle->xfercommand) {
		RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
	}

	filename = get_filename(url);
	if(!filename) {
		RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
	}
	destfile = get_destfile(localpath, filename);
	tempfile = get_tempfile(localpath, filename);

	/* replace all occurrences of %o with fn.part */
	strncpy(origCmd, handle->xfercommand, sizeof(origCmd));
	ptr1 = origCmd;
	while((ptr2 = strstr(ptr1, "%o"))) {
		usepart = 1;
		ptr2[0] = '\0';
		strcat(parsedCmd, ptr1);
		strcat(parsedCmd, tempfile);
		ptr1 = ptr2 + 2;
	}
	strcat(parsedCmd, ptr1);
	/* replace all occurrences of %u with the download URL */
	strncpy(origCmd, parsedCmd, sizeof(origCmd));
	parsedCmd[0] = '\0';
	ptr1 = origCmd;
	while((ptr2 = strstr(ptr1, "%u"))) {
		ptr2[0] = '\0';
		strcat(parsedCmd, ptr1);
		strcat(parsedCmd, url);
		ptr1 = ptr2 + 2;
	}
	strcat(parsedCmd, ptr1);
	/* cwd to the download directory */
	getcwd(cwd, PATH_MAX);
	if(chdir(localpath)) {
		_alpm_log(PM_LOG_WARNING, _("could not chdir to %s\n"), localpath);
		pm_errno = PM_ERR_EXTERNAL_DOWNLOAD;
		ret = -1;
		goto cleanup;
	}
	/* execute the parsed command via /bin/sh -c */
	_alpm_log(PM_LOG_DEBUG, "running command: %s\n", parsedCmd);
	retval = system(parsedCmd);

	if(retval == -1) {
		_alpm_log(PM_LOG_WARNING, _("running XferCommand: fork failed!\n"));
		pm_errno = PM_ERR_EXTERNAL_DOWNLOAD;
		ret = -1;
	} else if(retval != 0) {
		/* download failed */
		_alpm_log(PM_LOG_DEBUG, "XferCommand command returned non-zero status "
				"code (%d)\n", retval);
		ret = -1;
	} else {
		/* download was successful */
		if(usepart) {
			rename(tempfile, destfile);
		}
		ret = 0;
	}

cleanup:
	chdir(cwd);
	if(ret == -1) {
		/* hack to let an user the time to cancel a download */
		sleep(2);
	}
	FREE(destfile);
	FREE(tempfile);

	return(ret);
}

static int download(const char *url, const char *localpath,
		time_t mtimeold, time_t *mtimenew) {
	int ret;

	/* We have a few things to take into account here.
	 * 1. If we have both internal/external available, choose based on
	 * whether xfercommand is populated.
	 * 2. If we only have external available, we should first check
	 * if a command was provided before we drop into download_external.
	 */
	if(handle->xfercommand == NULL) {
#if defined(INTERNAL_DOWNLOAD)
		ret = download_internal(url, localpath, mtimeold, mtimenew);
#else
		RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
#endif
	} else {
		ret = download_external(url, localpath, mtimeold, mtimenew);
	}
	return(ret);
}

/*
 * Download a single file
 *   - if mtimeold is non-NULL, then only download the file if it's different
 *     than mtimeold.
 *   - if *mtimenew is non-NULL, it will be filled with the mtime of the remote
 *     file.
 *
 * RETURN:  0 for successful download
 *          1 if the mtimes are identical
 *         -1 on error
 */
int _alpm_download_single_file(const char *filename,
		alpm_list_t *servers, const char *localpath,
		time_t mtimeold, time_t *mtimenew)
{
	alpm_list_t *i;
	int ret = -1;

	for(i = servers; i; i = i->next) {
		const char *server = i->data;
		char *fileurl = NULL;
		int len;

		/* print server + filename into a buffer */
		len = strlen(server) + strlen(filename) + 2;
		CALLOC(fileurl, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, -1));
		snprintf(fileurl, len, "%s/%s", server, filename);

		ret = download(fileurl, localpath, mtimeold, mtimenew);
		FREE(fileurl);
		if(ret != -1) {
			break;
		}
	}

	return(ret);
}

int _alpm_download_files(alpm_list_t *files,
		alpm_list_t *servers, const char *localpath)
{
	int ret = 0;
	alpm_list_t *lp;

	for(lp = files; lp; lp = lp->next) {
		char *filename = lp->data;
		if(_alpm_download_single_file(filename, servers,
					localpath, 0, NULL) == -1) {
			ret++;
		}
	}

	return(ret);
}

/** Fetch a remote pkg.
 * @param url URL of the package to download
 * @return the downloaded filepath on success, NULL on error
 * @addtogroup alpm_misc
 */
char SYMEXPORT *alpm_fetch_pkgurl(const char *url)
{
	char *filename, *filepath;
	const char *cachedir;
	int ret;

	ALPM_LOG_FUNC;

	filename = get_filename(url);

	/* find a valid cache dir to download to */
	cachedir = _alpm_filecache_setup();

	/* download the file */
	ret = download(url, cachedir, 0, NULL);
	if(ret == -1) {
		_alpm_log(PM_LOG_WARNING, _("failed to download %s\n"), url);
		return(NULL);
	}
	_alpm_log(PM_LOG_DEBUG, "successfully downloaded %s\n", url);

	/* we should be able to find the file the second time around */
	filepath = _alpm_filecache_find(filename);
	return(filepath);
}

/* vim: set ts=2 sw=2 noet: */