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pacman/lib/libalpm/dload.c
Dan McGee 62f5da3779 Fix some more simple conversion "errors"
None of these warn at the normal "-Wall -Werror" level, but casts do occur
that we are fine with. Make them explicit to silence some warnings when
using "-Wconversion".

Signed-off-by: Dan McGee <dan@archlinux.org>
2011-01-07 21:15:47 -06:00

438 lines
12 KiB
C

/*
* 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>
/* the following two are needed for FreeBSD's libfetch */
#include <limits.h> /* PATH_MAX */
#if defined(HAVE_SYS_PARAM_H)
#include <sys/param.h> /* MAXHOSTNAMELEN */
#endif
#ifdef HAVE_LIBFETCH
#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);
}
#ifdef HAVE_LIBFETCH
static char *get_destfile(const char *path, const char *filename) {
char *destfile;
/* len = localpath len + filename len + null */
size_t 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 */
size_t 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 const char *gethost(struct url *fileurl)
{
const char *host = _("disk");
if(strcmp(SCHEME_FILE, fileurl->scheme) != 0) {
host = fileurl->host;
}
return(host);
}
int dload_interrupted;
static void inthandler(int signum)
{
dload_interrupted = 1;
}
#define check_stop() if(dload_interrupted) { ret = -1; goto cleanup; }
enum sighandlers { OLD = 0, NEW = 1 };
static int download_internal(const char *url, const char *localpath,
int force) {
FILE *localf = NULL;
struct stat st;
int ret = 0;
off_t dl_thisfile = 0;
ssize_t nread = 0;
char *tempfile, *destfile, *filename;
struct sigaction sig_pipe[2], sig_int[2];
off_t local_size = 0;
time_t local_time = 0;
struct url *fileurl;
struct url_stat ust;
fetchIO *dlf = NULL;
char buffer[PM_DLBUF_LEN];
filename = get_filename(url);
if(!filename) {
_alpm_log(PM_LOG_ERROR, _("url '%s' is invalid\n"), url);
RET_ERR(PM_ERR_SERVER_BAD_URL, -1);
}
fileurl = fetchParseURL(url);
if(!fileurl) {
_alpm_log(PM_LOG_ERROR, _("url '%s' is invalid\n"), url);
RET_ERR(PM_ERR_LIBFETCH, -1);
}
destfile = get_destfile(localpath, filename);
tempfile = get_tempfile(localpath, filename);
if(stat(tempfile, &st) == 0 && st.st_size > 0) {
_alpm_log(PM_LOG_DEBUG, "tempfile found, attempting continuation\n");
local_time = fileurl->last_modified = st.st_mtime;
local_size = fileurl->offset = (off_t)st.st_size;
dl_thisfile = st.st_size;
localf = fopen(tempfile, "ab");
} else if(!force && stat(destfile, &st) == 0 && st.st_size > 0) {
_alpm_log(PM_LOG_DEBUG, "destfile found, using mtime only\n");
local_time = fileurl->last_modified = st.st_mtime;
local_size = /* no fu->off here */ (off_t)st.st_size;
} else {
_alpm_log(PM_LOG_DEBUG, "no file found matching criteria, starting from scratch\n");
}
/* pass the raw filename for passing to the callback function */
_alpm_log(PM_LOG_DEBUG, "using '%s' for download progress\n", filename);
/* 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"));
/* 10s timeout */
fetchTimeout = 10;
/* 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);
/* NOTE: libfetch does not reset the error code, be sure to do it before
* calls into the library */
/* find out the remote size *and* mtime in one go. there is a lot of
* trouble in trying to do both size and "if-modified-since" logic in a
* non-stat request, so avoid it. */
fetchLastErrCode = 0;
if(fetchStat(fileurl, &ust, "") == -1) {
pm_errno = PM_ERR_LIBFETCH;
_alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"),
filename, gethost(fileurl), fetchLastErrString);
ret = -1;
goto cleanup;
}
check_stop();
_alpm_log(PM_LOG_DEBUG, "ust.mtime: %ld local_time: %ld compare: %ld\n",
ust.mtime, local_time, local_time - ust.mtime);
_alpm_log(PM_LOG_DEBUG, "ust.size: %jd local_size: %jd compare: %jd\n",
(intmax_t)ust.size, (intmax_t)local_size, (intmax_t)(local_size - ust.size));
if(!force && ust.mtime && ust.mtime == local_time
&& ust.size && ust.size == local_size) {
/* the remote time and size values agreed with what we have, so move on
* because there is nothing more to do. */
_alpm_log(PM_LOG_DEBUG, "files are identical, skipping %s\n", filename);
ret = 1;
goto cleanup;
}
if(!ust.mtime || ust.mtime != local_time) {
_alpm_log(PM_LOG_DEBUG, "mtimes were different or unavailable, downloading %s from beginning\n", filename);
fileurl->offset = 0;
}
fetchLastErrCode = 0;
dlf = fetchGet(fileurl, "");
check_stop();
if(fetchLastErrCode != 0 || dlf == NULL) {
pm_errno = PM_ERR_LIBFETCH;
_alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"),
filename, gethost(fileurl), fetchLastErrString);
ret = -1;
goto cleanup;
} else {
_alpm_log(PM_LOG_DEBUG, "connected to %s successfully\n", fileurl->host);
}
if(localf && fileurl->offset == 0) {
_alpm_log(PM_LOG_WARNING, _("resuming download of %s not possible; starting over\n"), filename);
fclose(localf);
localf = NULL;
} else if(fileurl->offset) {
_alpm_log(PM_LOG_DEBUG, "resuming download at position %jd\n", (intmax_t)fileurl->offset);
}
if(localf == NULL) {
_alpm_rmrf(tempfile);
fileurl->offset = (off_t)0;
dl_thisfile = 0;
localf = fopen(tempfile, "wb");
if(localf == NULL) { /* still null? */
pm_errno = PM_ERR_RETRIEVE;
_alpm_log(PM_LOG_ERROR, _("error writing to file '%s': %s\n"),
tempfile, strerror(errno));
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) {
check_stop();
size_t nwritten = 0;
nwritten = fwrite(buffer, 1, (size_t)nread, localf);
if((nwritten != (size_t)nread) || ferror(localf)) {
pm_errno = PM_ERR_RETRIEVE;
_alpm_log(PM_LOG_ERROR, _("error writing to file '%s': %s\n"),
tempfile, 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 (nread == -1) {
/* not PM_ERR_LIBFETCH here because libfetch error string might be empty */
pm_errno = PM_ERR_RETRIEVE;
_alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s\n"),
filename, gethost(fileurl));
ret = -1;
goto cleanup;
}
if (ust.size != -1 && dl_thisfile < ust.size) {
pm_errno = PM_ERR_RETRIEVE;
_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;
/* set the times on the file to the same as that of the remote file */
if(ust.mtime) {
struct timeval tv[2];
memset(&tv, 0, sizeof(tv));
tv[0].tv_sec = ust.atime;
tv[1].tv_sec = ust.mtime;
utimes(tempfile, tv);
}
rename(tempfile, destfile);
ret = 0;
cleanup:
FREE(tempfile);
FREE(destfile);
if(localf != NULL) {
/* if we still had a local file open, we got interrupted. set the mtimes on
* the file accordingly. */
fflush(localf);
if(ust.mtime) {
struct timeval tv[2];
memset(&tv, 0, sizeof(tv));
tv[0].tv_sec = ust.atime;
tv[1].tv_sec = ust.mtime;
futimes(fileno(localf), tv);
}
fclose(localf);
}
if(dlf != NULL) {
fetchIO_close(dlf);
}
fetchFreeURL(fileurl);
/* 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_LIBFETCH
return(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.
* @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);
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: */