summaryrefslogtreecommitdiff
path: root/lib/libalpm/dload.c
blob: f756828218fa6d069ad610337b5fe9c905861d26 (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
/*
 *  download.c
 *
 *  Copyright (c) 2006-2011 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 <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>

#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#endif

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

#ifdef HAVE_LIBCURL
static double prevprogress; /* last download amount */
#endif

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

#ifdef HAVE_LIBCURL
static char *get_fullpath(const char *path, const char *filename,
		const char *suffix)
{
	char *filepath;
	/* len = localpath len + filename len + suffix len + null */
	size_t len = strlen(path) + strlen(filename) + strlen(suffix) + 1;
	CALLOC(filepath, len, sizeof(char), RET_ERR(PM_ERR_MEMORY, NULL));
	snprintf(filepath, len, "%s%s%s", path, filename, suffix);

	return filepath;
}

#define check_stop() if(dload_interrupted) { ret = -1; goto cleanup; }
enum sighandlers { OLD = 0, NEW = 1 };

static int dload_interrupted;
static void inthandler(int signum)
{
	(void)signum;
	dload_interrupted = 1;
}

static int curl_progress(void *file, double dltotal, double dlnow,
		double ultotal, double ulnow)
{
	struct fileinfo *dlfile = (struct fileinfo *)file;
	double current_size, total_size;

	/* unused parameters */
	(void)ultotal;
	(void)ulnow;

	/* SIGINT sent, abort by alerting curl */
	if(dload_interrupted) {
		return 1;
	}

	/* none of what follows matters if the front end has no callback */
	if(handle->dlcb == NULL) {
		return 0;
	}

	current_size = dlfile->initial_size + dlnow;
	total_size = dlfile->initial_size + dltotal;

	if(DOUBLE_EQ(dltotal, 0) || DOUBLE_EQ(prevprogress, total_size)) {
		return 0;
	}

	/* initialize the progress bar here to avoid displaying it when
	 * a repo is up to date and nothing gets downloaded */
	if(DOUBLE_EQ(prevprogress, 0)) {
		handle->dlcb(dlfile->filename, 0, (long)dltotal);
	}

	handle->dlcb(dlfile->filename, (long)current_size, (long)total_size);

	prevprogress = current_size;

	return 0;
}

static int curl_gethost(const char *url, char *buffer)
{
	size_t hostlen;
	char *p;

	if(strncmp(url, "file://", 7) == 0) {
		strcpy(buffer, _("disk"));
	} else {
		p = strstr(url, "//");
		if(!p) {
			return 1;
		}
		p += 2; /* jump over the found // */
		hostlen = strcspn(p, "/");
		if(hostlen > 255) {
			/* buffer overflow imminent */
			_alpm_log(PM_LOG_ERROR, _("buffer overflow detected"));
			return 1;
		}
		snprintf(buffer, hostlen + 1, "%s", p);
	}

	return 0;
}

static int utimes_long(const char *path, long time)
{
	if(time != -1) {
		struct timeval tv[2];
		memset(&tv, 0, sizeof(tv));
		tv[0].tv_sec = tv[1].tv_sec = time;
		return utimes(path, tv);
	}
	return 0;
}


static int curl_download_internal(const char *url, const char *localpath,
		int force)
{
	int ret = -1;
	FILE *localf = NULL;
	const char *useragent;
	const char *open_mode = "wb";
	char *destfile, *tempfile;
	char hostname[256]; /* RFC1123 states applications should support this length */
	struct stat st;
	long httpresp, timecond, remote_time;
	double remote_size, bytes_dl;
	struct sigaction sig_pipe[2], sig_int[2];
	struct fileinfo dlfile;

	dlfile.initial_size = 0.0;
	dlfile.filename = get_filename(url);
	if(!dlfile.filename || curl_gethost(url, hostname) != 0) {
		_alpm_log(PM_LOG_ERROR, _("url '%s' is invalid\n"), url);
		RET_ERR(PM_ERR_SERVER_BAD_URL, -1);
	}

	destfile = get_fullpath(localpath, dlfile.filename, "");
	tempfile = get_fullpath(localpath, dlfile.filename, ".part");
	if(!destfile || !tempfile) {
		goto cleanup;
	}

	/* the curl_easy handle is initialized with the alpm handle, so we only need
	 * to reset the curl handle set parameters for each time it's used. */
	curl_easy_reset(handle->curl);
	curl_easy_setopt(handle->curl, CURLOPT_URL, url);
	curl_easy_setopt(handle->curl, CURLOPT_FAILONERROR, 1L);
	curl_easy_setopt(handle->curl, CURLOPT_CONNECTTIMEOUT, 10L);
	curl_easy_setopt(handle->curl, CURLOPT_FILETIME, 1L);
	curl_easy_setopt(handle->curl, CURLOPT_NOPROGRESS, 0L);
	curl_easy_setopt(handle->curl, CURLOPT_FOLLOWLOCATION, 1L);
	curl_easy_setopt(handle->curl, CURLOPT_PROGRESSFUNCTION, curl_progress);
	curl_easy_setopt(handle->curl, CURLOPT_PROGRESSDATA, (void *)&dlfile);

	useragent = getenv("HTTP_USER_AGENT");
	if(useragent != NULL) {
		curl_easy_setopt(handle->curl, CURLOPT_USERAGENT, useragent);
	}

	/* TODO: no assuming here. the calling function should tell us what's kosher */
	if(!force && stat(destfile, &st) == 0) {
		/* assume its a sync, so we're starting from scratch. but, only download
		 * our local is out of date. */
		curl_easy_setopt(handle->curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
		curl_easy_setopt(handle->curl, CURLOPT_TIMEVALUE, (long)st.st_mtime);
	} else if(stat(tempfile, &st) == 0 && st.st_size > 0) {
		/* assume its a partial package download. we do not support resuming of
		 * transfers on partially downloaded sync DBs. */
		open_mode = "ab";
		curl_easy_setopt(handle->curl, CURLOPT_RESUME_FROM, (long)st.st_size);
		_alpm_log(PM_LOG_DEBUG, "tempfile found, attempting continuation");
		dlfile.initial_size = (double)st.st_size;
	}

	localf = fopen(tempfile, open_mode);
	if(localf == NULL) {
		goto cleanup;
	}

	curl_easy_setopt(handle->curl, CURLOPT_WRITEDATA, localf);

	/* ignore any SIGPIPE signals- these may occur if our FTP socket dies or
	 * something along those lines. Store the old signal handler first. */
	sig_pipe[NEW].sa_handler = SIG_IGN;
	sigemptyset(&sig_pipe[NEW].sa_mask);
	sig_pipe[NEW].sa_flags = 0;
	sigaction(SIGPIPE, NULL, &sig_pipe[OLD]);
	sigaction(SIGPIPE, &sig_pipe[NEW], NULL);

	dload_interrupted = 0;
	sig_int[NEW].sa_handler = &inthandler;
	sigemptyset(&sig_int[NEW].sa_mask);
	sig_int[NEW].sa_flags = 0;
	sigaction(SIGINT, NULL, &sig_int[OLD]);
	sigaction(SIGINT, &sig_int[NEW], NULL);

	/* Progress 0 - initialize */
	prevprogress = 0;

	/* perform transfer */
	handle->curlerr = curl_easy_perform(handle->curl);

	/* retrieve info about the state of the transfer */
	curl_easy_getinfo(handle->curl, CURLINFO_RESPONSE_CODE, &httpresp);
	curl_easy_getinfo(handle->curl, CURLINFO_FILETIME, &remote_time);
	curl_easy_getinfo(handle->curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &remote_size);
	curl_easy_getinfo(handle->curl, CURLINFO_SIZE_DOWNLOAD, &bytes_dl);
	curl_easy_getinfo(handle->curl, CURLINFO_CONDITION_UNMET, &timecond);

	/* time condition was met and we didn't download anything. we need to
	 * clean up the 0 byte .part file that's left behind. */
	if(DOUBLE_EQ(bytes_dl, 0) && timecond == 1) {
		ret = 1;
		unlink(tempfile);
		goto cleanup;
	}

	if(handle->curlerr == CURLE_ABORTED_BY_CALLBACK) {
		goto cleanup;
	} else if(handle->curlerr != CURLE_OK) {
		pm_errno = PM_ERR_LIBCURL;
		_alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"),
				dlfile.filename, hostname, curl_easy_strerror(handle->curlerr));
		unlink(tempfile);
		goto cleanup;
	}

	/* remote_size isn't necessarily the full size of the file, just what the
	 * server reported as remaining to download. compare it to what curl reported
	 * as actually being transferred during curl_easy_perform() */
	if(!DOUBLE_EQ(remote_size, -1) && !DOUBLE_EQ(bytes_dl, -1) &&
			!DOUBLE_EQ(bytes_dl, remote_size)) {
		pm_errno = PM_ERR_RETRIEVE;
		_alpm_log(PM_LOG_ERROR, _("%s appears to be truncated: %jd/%jd bytes\n"),
				dlfile.filename, (intmax_t)bytes_dl, (intmax_t)remote_size);
		goto cleanup;
	}

	ret = 0;

cleanup:
	if(localf != NULL) {
		fclose(localf);
		utimes_long(tempfile, remote_time);
	}

	/* TODO: A signature download will need to return success here as well before
	 * we're willing to rotate the new file into place. */
	if(ret == 0) {
		rename(tempfile, destfile);
	}

	FREE(tempfile);
	FREE(destfile);

	/* restore the old signal handlers */
	sigaction(SIGINT, &sig_int[OLD], NULL);
	sigaction(SIGPIPE, &sig_pipe[OLD], NULL);
	/* if we were interrupted, trip the old handler */
	if(dload_interrupted) {
		raise(SIGINT);
	}

	return ret;
}
#endif

static int download(const char *url, const char *localpath,
		int force)
{
	if(handle->fetchcb == NULL) {
#ifdef HAVE_LIBCURL
		return curl_download_internal(url, localpath, force);
#else
		RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
#endif
	} else {
		int ret = handle->fetchcb(url, localpath, force);
		if(ret == -1) {
			RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
		}
		return ret;
	}
}

/*
 * Download a single file
 *   - servers must be a list of urls WITHOUT trailing slashes.
 *
 * RETURN:  0 for successful download
 *          1 if the files are identical
 *         -1 on error
 */
int _alpm_download_single_file(const char *filename,
		alpm_list_t *servers, const char *localpath,
		int force)
{
	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;
		size_t 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, force);
		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) == -1) {
			ret++;
		}
	}

	return ret;
}

/** Fetch a remote pkg. */
char SYMEXPORT *alpm_fetch_pkgurl(const char *url)
{
	char *filepath;
	const char *filename, *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);
	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: */