diff options
Diffstat (limited to 'lib/libalpm/dload.c')
| -rw-r--r-- | lib/libalpm/dload.c | 463 |
1 files changed, 463 insertions, 0 deletions
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c new file mode 100644 index 00000000..b5f0b876 --- /dev/null +++ b/lib/libalpm/dload.c @@ -0,0 +1,463 @@ +/* + * 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; + 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); + } + + /* 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: */ |