1 files changed, 428 insertions, 0 deletions

diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
new file mode 100644
index 00000000..2e50544b
--- /dev/null
+++ b/lib/libalpm/dload.c
@@ -0,0 +1,428 @@
+/*
+ *  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 <download.h> /* libdownload */
+
+/* libalpm */
+#include "dload.h"
+#include "alpm_list.h"
+#include "alpm.h"
+#include "log.h"
+#include "util.h"
+#include "error.h"
+#include "handle.h"
+
+/* 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 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);
+}
+
+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;
+	int 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;
+		}
+		_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);
+	}
+
+	int nread = 0;
+	char buffer[PM_DLBUF_LEN];
+	while((nread = fread(buffer, 1, PM_DLBUF_LEN, dlf)) > 0) {
+		if(ferror(dlf)) {
+			_alpm_log(PM_LOG_ERROR, _("error downloading '%s': %s\n"),
+					filename, downloadLastErrString);
+			ret = -1;
+			goto cleanup;
+		}
+
+		int 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);
+}
+
+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;
+
+	filename = get_filename(url);
+	if(!filename) {
+		return(-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_CONNECT_FAILED;
+		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_FORK_FAILED;
+		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;
+	const char *proto = "file://";
+	int len = strlen(proto);
+	if(strncmp(url, proto, len) == 0) {
+		/* we can simply grab an absolute path from the file:// url by starting
+		 * our path at the char following the proto (the root '/')
+		 */
+		const char *sourcefile = url + len;
+		const char *filename = get_filename(url);
+		const char *destfile = get_destfile(localpath, filename);
+
+		if(_alpm_copyfile(sourcefile, destfile) == 0) {
+			return(0);
+		} else {
+			return(-1);
+		}
+	}
+
+	if(handle->xfercommand == NULL) {
+		ret = download_internal(url, localpath, mtimeold, mtimenew);
+	} 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: */