summaryrefslogtreecommitdiffstats
path: root/lib/libalpm/dload.c
blob: a06cb46214a6c20785a34fa38ca194a7373e1af7 (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
/*
 *  download.c
 *
 *  Copyright (c) 2006-2009 Pacman Development Team <pacman-dev@archlinux.org>
 *  Copyright (c) 2002-2006 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 <signal.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(INTERNAL_DOWNLOAD)
#include <fetch.h>
#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);
}

#if defined(INTERNAL_DOWNLOAD)
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);
}

/* Build a 'struct url' from an url. */
static struct url *url_for_string(const char *url)
{
	struct url *ret = NULL;
	ret = fetchParseURL(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) {
	fetchIO *dlf = NULL;
	FILE *localf = NULL;
	struct url_stat ust;
	struct stat st;
	int chk_resume = 0, ret = 0;
	size_t dl_thisfile = 0, nread = 0;
	char *tempfile, *destfile, *filename;
	struct sigaction new_action, old_action;
	struct url *fileurl = url_for_string(url);
	char buffer[PM_DLBUF_LEN];

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

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

	if(mtimeold) {
		fileurl->last_modified = mtimeold;
	}

	/* 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;
	}

	/* print proxy info for debug purposes */
	_alpm_log(PM_LOG_DEBUG, "HTTP_PROXY: %s\n", getenv("HTTP_PROXY"));
	_alpm_log(PM_LOG_DEBUG, "http_proxy: %s\n", getenv("http_proxy"));
	_alpm_log(PM_LOG_DEBUG, "FTP_PROXY:  %s\n", getenv("FTP_PROXY"));
	_alpm_log(PM_LOG_DEBUG, "ftp_proxy:  %s\n", getenv("ftp_proxy"));

	/* libfetch does not reset the error code */
	fetchLastErrCode = 0;

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

	/* ignore any SIGPIPE signals- these may occur if our FTP socket dies or
	 * something along those lines. Store the old signal handler first. */
	new_action.sa_handler = SIG_IGN;
	sigemptyset(&new_action.sa_mask);
	sigaction(SIGPIPE, NULL, &old_action);
	sigaction(SIGPIPE, &new_action, NULL);

	dlf = fetchXGet(fileurl, &ust, (handle->nopassiveftp ? "i" : "pi"));

	if(fetchLastErrCode == FETCH_UNCHANGED) {
		_alpm_log(PM_LOG_DEBUG, "mtimes are identical, skipping %s\n", filename);
		ret = 1;
		goto cleanup;
	}

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

	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);
	}

	while((nread = fetchIO_read(dlf, buffer, PM_DLBUF_LEN)) > 0) {
		size_t nwritten = 0;
		nwritten = fwrite(buffer, 1, nread, localf);
		if((nwritten != nread) || 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);
		}
	}

	/* did the transfer complete normally? */
	if (ust.size != -1 && dl_thisfile < ust.size) {
		pm_errno = PM_ERR_LIBFETCH;
		_alpm_log(PM_LOG_ERROR, _("%s appears to be truncated: %jd/%jd bytes\n"),
				filename, (intmax_t)dl_thisfile, (intmax_t)ust.size);
		ret = -1;
		goto cleanup;
	}

	/* 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;
	fetchIO_close(dlf);
	dlf = NULL;

	rename(tempfile, destfile);
	ret = 0;

cleanup:
	/* restore any existing SIGPIPE signal handler */
	sigaction(SIGPIPE, &old_action, NULL);

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

static int download(const char *url, const char *localpath,
		time_t mtimeold, time_t *mtimenew) {
	if(handle->fetchcb == NULL) {
#if defined(INTERNAL_DOWNLOAD)
		return(download_internal(url, localpath, mtimeold, mtimenew));
#else
		RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
#endif
	} else {
		int ret = handle->fetchcb(url, localpath, mtimeold, mtimenew);
		if(ret == -1) {
			RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
		}
		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.
 *   - servers must be a list of urls WITHOUT trailing slashes.
 *
 * 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;

	ASSERT(servers != NULL, RET_ERR(PM_ERR_SERVER_NONE, -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: */