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mirror of https://github.com/moparisthebest/pacman synced 2024-10-31 15:45:03 -04:00
pacman/lib/libalpm/dload.c
Dan McGee 07a1292721 Check return value of rename() calls
We did a good job checking this in add.c, but not necessarily anywhere
else. Fix this up by adding checks into dload.c, remove.c, and conf.c in
the frontend. Also add loggers where appropriate and make the message
syntax more consistent.

Signed-off-by: Dan McGee <dan@archlinux.org>
2011-08-08 13:29:45 -05:00

503 lines
15 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>
#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"
static const char *get_filename(const char *url)
{
char *filename = strrchr(url, '/');
if(filename != NULL) {
filename++;
}
return filename;
}
#ifdef HAVE_LIBCURL
static double prevprogress; /* last download amount */
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), return 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 UNUSED signum)
{
dload_interrupted = 1;
}
static int curl_progress(void *file, double dltotal, double dlnow,
double UNUSED ultotal, double UNUSED ulnow)
{
struct dload_payload *payload = (struct dload_payload *)file;
double current_size, total_size;
/* SIGINT sent, abort by alerting curl */
if(dload_interrupted) {
return 1;
}
/* none of what follows matters if the front end has no callback */
if(payload->handle->dlcb == NULL) {
return 0;
}
current_size = payload->initial_size + dlnow;
total_size = payload->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)) {
payload->handle->dlcb(payload->filename, 0, (long)dltotal);
}
payload->handle->dlcb(payload->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 */
return 1;
}
snprintf(buffer, hostlen + 1, "%s", p);
}
return 0;
}
static int utimes_long(const char *path, long seconds)
{
if(seconds != -1) {
struct timeval tv[2];
memset(&tv, 0, sizeof(tv));
tv[0].tv_sec = tv[1].tv_sec = seconds;
return utimes(path, tv);
}
return 0;
}
static size_t parse_headers(void *ptr, size_t size, size_t nmemb, void *user)
{
size_t realsize = size * nmemb;
const char *fptr, *endptr = NULL;
const char * const cd_header = "Content-Disposition:";
const char * const fn_key = "filename=";
struct dload_payload *payload = (struct dload_payload *)user;
if(_alpm_raw_ncmp(cd_header, ptr, strlen(cd_header)) == 0) {
if((fptr = strstr(ptr, fn_key))) {
fptr += strlen(fn_key);
/* find the end of the field, which is either a semi-colon, or the end of
* the data. As per curl_easy_setopt(3), we cannot count on headers being
* null terminated, so we look for the closing \r\n */
endptr = fptr + strcspn(fptr, ";\r\n") - 1;
/* remove quotes */
if(*fptr == '"' && *endptr == '"') {
fptr++;
endptr--;
}
STRNDUP(payload->cd_filename, fptr, endptr - fptr + 1,
RET_ERR(payload->handle, ALPM_ERR_MEMORY, realsize));
}
}
return realsize;
}
static int curl_download_internal(struct dload_payload *payload,
const char *localpath, char **final_file)
{
int ret = -1, should_unlink = 0;
FILE *localf = NULL;
const char *useragent;
const char *open_mode = "wb";
char *destfile = NULL, *tempfile = NULL, *effective_url;
/* RFC1123 states applications should support this length */
char hostname[256];
char error_buffer[CURL_ERROR_SIZE];
struct stat st;
long timecond, remote_time = -1;
double remote_size, bytes_dl;
struct sigaction sig_pipe[2], sig_int[2];
/* shortcut to our handle within the payload */
alpm_handle_t *handle = payload->handle;
if(!payload->filename) {
payload->filename = get_filename(payload->fileurl);
}
if(!payload->filename || curl_gethost(payload->fileurl, hostname) != 0) {
_alpm_log(handle, ALPM_LOG_ERROR, _("url '%s' is invalid\n"), payload->fileurl);
RET_ERR(handle, ALPM_ERR_SERVER_BAD_URL, -1);
}
if(strlen(payload->filename) > 0 && strcmp(payload->filename, ".sig") != 0) {
destfile = get_fullpath(localpath, payload->filename, "");
tempfile = get_fullpath(localpath, payload->filename, ".part");
if(!destfile || !tempfile) {
goto cleanup;
}
} else {
/* URL isn't to a file and ended with a slash */
int fd;
char randpath[PATH_MAX];
/* we can't support resuming this kind of download, so a partial transfer
* will be destroyed */
should_unlink = 1;
/* create a random filename, which is opened with O_EXCL */
snprintf(randpath, PATH_MAX, "%salpmtmp.XXXXXX", localpath);
if((fd = mkstemp(randpath)) == -1 || !(localf = fdopen(fd, open_mode))) {
unlink(randpath);
close(fd);
_alpm_log(handle, ALPM_LOG_ERROR,
_("failed to create temporary file for download\n"));
goto cleanup;
}
/* localf now points to our alpmtmp.XXXXXX */
STRDUP(tempfile, randpath, RET_ERR(handle, ALPM_ERR_MEMORY, -1));
payload->filename = strrchr(randpath, '/') + 1;
}
error_buffer[0] = '\0';
/* 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, payload->fileurl);
curl_easy_setopt(handle->curl, CURLOPT_FAILONERROR, 1L);
curl_easy_setopt(handle->curl, CURLOPT_ERRORBUFFER, error_buffer);
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 *)payload);
curl_easy_setopt(handle->curl, CURLOPT_LOW_SPEED_LIMIT, 1024L);
curl_easy_setopt(handle->curl, CURLOPT_LOW_SPEED_TIME, 10L);
curl_easy_setopt(handle->curl, CURLOPT_HEADERFUNCTION, parse_headers);
curl_easy_setopt(handle->curl, CURLOPT_WRITEHEADER, (void *)payload);
if(payload->max_size) {
curl_easy_setopt(handle->curl, CURLOPT_MAXFILESIZE, payload->max_size);
}
useragent = getenv("HTTP_USER_AGENT");
if(useragent != NULL) {
curl_easy_setopt(handle->curl, CURLOPT_USERAGENT, useragent);
}
if(!payload->allow_resume && !payload->force && stat(destfile, &st) == 0) {
/* start from scratch, but only download if 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 && payload->allow_resume) {
/* a previous partial download exists, resume from end of file. */
open_mode = "ab";
curl_easy_setopt(handle->curl, CURLOPT_RESUME_FROM, (long)st.st_size);
_alpm_log(handle, ALPM_LOG_DEBUG, "tempfile found, attempting continuation\n");
payload->initial_size = (double)st.st_size;
}
if(localf == NULL) {
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);
/* was it a success? */
if(handle->curlerr == CURLE_ABORTED_BY_CALLBACK) {
goto cleanup;
} else if(handle->curlerr != CURLE_OK) {
if(!payload->errors_ok) {
handle->pm_errno = ALPM_ERR_LIBCURL;
_alpm_log(handle, ALPM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"),
payload->filename, hostname, error_buffer);
} else {
_alpm_log(handle, ALPM_LOG_DEBUG, "failed retrieving file '%s' from %s : %s\n",
payload->filename, hostname, error_buffer);
}
unlink(tempfile);
goto cleanup;
}
/* retrieve info about the state of the transfer */
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);
curl_easy_getinfo(handle->curl, CURLINFO_EFFECTIVE_URL, &effective_url);
/* 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(timecond == 1 && DOUBLE_EQ(bytes_dl, 0)) {
ret = 1;
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)) {
handle->pm_errno = ALPM_ERR_RETRIEVE;
_alpm_log(handle, ALPM_LOG_ERROR, _("%s appears to be truncated: %jd/%jd bytes\n"),
payload->filename, (intmax_t)bytes_dl, (intmax_t)remote_size);
goto cleanup;
}
if(payload->cd_filename) {
/* content-disposition header has a better name for our file */
free(destfile);
destfile = get_fullpath(localpath, payload->cd_filename, "");
} else {
const char *effective_filename = strrchr(effective_url, '/');
if(effective_filename) {
effective_filename++;
/* if destfile was never set, we wrote to a tempfile. even if destfile is
* set, we may have followed some redirects and the effective url may
* have a better suggestion as to what to name our file. in either case,
* refactor destfile to this newly derived name. */
if(!destfile || strcmp(effective_filename, strrchr(destfile, '/') + 1) != 0) {
free(destfile);
destfile = get_fullpath(localpath, effective_filename, "");
}
}
}
ret = 0;
cleanup:
if(localf != NULL) {
fclose(localf);
utimes_long(tempfile, remote_time);
}
if(ret == 0) {
if(rename(tempfile, destfile)) {
_alpm_log(handle, ALPM_LOG_ERROR, _("could not rename %s to %s (%s)\n"),
tempfile, destfile, strerror(errno));
ret = -1;
} else if(final_file) {
*final_file = strdup(strrchr(destfile, '/') + 1);
}
}
if(dload_interrupted && should_unlink) {
unlink(tempfile);
}
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
/** Download a file given by a URL to a local directory.
* Does not overwrite an existing file if the download fails.
* @param payload the payload context
* @param localpath the directory to save the file in
* @param final_file the real name of the downloaded file (may be NULL)
* @return 0 on success, -1 on error (pm_errno is set accordingly if errors_ok == 0)
*/
int _alpm_download(struct dload_payload *payload, const char *localpath,
char **final_file)
{
alpm_handle_t *handle = payload->handle;
if(handle->fetchcb == NULL) {
#ifdef HAVE_LIBCURL
return curl_download_internal(payload, localpath, final_file);
#else
RET_ERR(handle, ALPM_ERR_EXTERNAL_DOWNLOAD, -1);
#endif
} else {
int ret = handle->fetchcb(payload->fileurl, localpath, payload->force);
if(ret == -1 && !payload->errors_ok) {
RET_ERR(handle, ALPM_ERR_EXTERNAL_DOWNLOAD, -1);
}
return ret;
}
}
/** Fetch a remote pkg. */
char SYMEXPORT *alpm_fetch_pkgurl(alpm_handle_t *handle, const char *url)
{
char *filepath;
const char *cachedir;
char *final_file = NULL;
struct dload_payload *payload;
int ret;
CHECK_HANDLE(handle, return NULL);
/* find a valid cache dir to download to */
cachedir = _alpm_filecache_setup(handle);
CALLOC(payload, 1, sizeof(*payload), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
payload->handle = handle;
payload->fileurl = strdup(url);
payload->allow_resume = 1;
/* download the file */
ret = _alpm_download(payload, cachedir, &final_file);
if(ret == -1) {
_alpm_log(handle, ALPM_LOG_WARNING, _("failed to download %s\n"), url);
return NULL;
}
_alpm_log(handle, ALPM_LOG_DEBUG, "successfully downloaded %s\n", url);
/* attempt to download the signature */
if(ret == 0 && (handle->siglevel & ALPM_SIG_PACKAGE)) {
char *sig_final_file = NULL;
size_t len;
struct dload_payload *sig_payload;
CALLOC(sig_payload, 1, sizeof(*sig_payload), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
len = strlen(url) + 5;
CALLOC(sig_payload->fileurl, len, sizeof(char), RET_ERR(handle, ALPM_ERR_MEMORY, NULL));
snprintf(sig_payload->fileurl, len, "%s.sig", url);
sig_payload->handle = handle;
sig_payload->force = 1;
sig_payload->errors_ok = (handle->siglevel & ALPM_SIG_PACKAGE_OPTIONAL);
ret = _alpm_download(sig_payload, cachedir, &sig_final_file);
if(ret == -1 && !sig_payload->errors_ok) {
_alpm_log(handle, ALPM_LOG_WARNING, _("failed to download %s\n"), sig_payload->fileurl);
/* Warn now, but don't return NULL. We will fail later during package
* load time. */
} else if(ret == 0) {
_alpm_log(handle, ALPM_LOG_DEBUG, "successfully downloaded %s\n", sig_payload->fileurl);
}
FREE(sig_final_file);
_alpm_dload_payload_free(sig_payload);
}
/* we should be able to find the file the second time around */
filepath = _alpm_filecache_find(handle, final_file);
FREE(final_file);
_alpm_dload_payload_free(payload);
return filepath;
}
void _alpm_dload_payload_free(struct dload_payload *payload) {
struct dload_payload *load = (struct dload_payload *)payload;
ASSERT(load, return);
FREE(load->fileurl);
FREE(load->cd_filename);
FREE(load);
}
/* vim: set ts=2 sw=2 noet: */