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-rw-r--r--lib/libalpm/dload.c427
1 files changed, 427 insertions, 0 deletions
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
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+++ b/lib/libalpm/dload.c
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+/*
+ * 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);
+ char *destfile = get_destfile(localpath, filename);
+
+ ret = _alpm_copyfile(sourcefile, destfile);
+ FREE(destfile);
+ /* copyfile returns 1 on failure, we want to return -1 on failure */
+ return(ret ? -1 : 0);
+ }
+
+ 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: */