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authorDave Reisner <d@falconindy.com>2011-02-01 15:38:37 -0500
committerDave Reisner <d@falconindy.com>2011-03-09 15:22:32 -0500
commit96e458b705eda4ddff7d6ec890cf1daf898e9186 (patch)
tree192741351db0f28e0c27c2ad5f6755cfa5424bdc /lib/libalpm/dload.c
parent8a58648471e3a5311529955cd91c1a082be10056 (diff)
dload.c: add curl_download_internal
This is a feature complete re-implementation of the fetch based internal downloader, with a few improvements: * support for SSL * gzip and deflate compression on HTTP connections * reuses a single connection over the entire session for lower resource usage. Signed-off-by: Dave Reisner <d@falconindy.com>
Diffstat (limited to 'lib/libalpm/dload.c')
-rw-r--r--lib/libalpm/dload.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index a08eda16..22fee543 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -350,6 +350,214 @@ cleanup:
}
#endif
+#ifdef HAVE_LIBCURL
+static int curl_progress(void *filename, double dltotal, double dlnow,
+ double ultotal, double ulnow) {
+
+ /* unused parameters */
+ (void)ultotal;
+ (void)ulnow;
+
+ if(dltotal == 0) {
+ return(0);
+ }
+
+ if(dload_interrupted) {
+ return(1);
+ }
+
+ handle->dlcb((const char*)filename, (long)dlnow, (long)dltotal);
+
+ return(0);
+}
+
+static int curl_gethost(const char *url, char *buffer) {
+ int 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 */
+ _alpm_log(PM_LOG_ERROR, _("buffer overflow detected"));
+ return(1);
+ }
+ snprintf(buffer, hostlen + 1, "%s", p);
+ }
+
+ return(0);
+}
+
+static int curl_download_internal(const char *url, const char *localpath,
+ int force) {
+ int ret = -1;
+ FILE *localf = NULL;
+ char *destfile, *filename, *tempfile;
+ char hostname[256]; /* RFC1123 states applications should support this length */
+ struct stat st;
+ long httpresp, timecond, remote_time, local_time;
+ double remote_size, bytes_dl;
+ struct sigaction sig_pipe[2], sig_int[2];
+
+ filename = get_filename(url);
+ if(!filename || curl_gethost(url, hostname) != 0) {
+ _alpm_log(PM_LOG_ERROR, _("url '%s' is invalid\n"), url);
+ RET_ERR(PM_ERR_SERVER_BAD_URL, -1);
+ }
+
+ destfile = get_destfile(localpath, filename);
+ tempfile = get_tempfile(localpath, filename);
+
+ /* 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, url);
+ curl_easy_setopt(handle->curl, CURLOPT_FAILONERROR, 1L);
+ curl_easy_setopt(handle->curl, CURLOPT_ENCODING, "deflate, gzip");
+ 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, filename);
+
+ if(!force && stat(destfile, &st) == 0) {
+ /* assume its a sync, so we're starting from scratch. but, only download
+ * our local is out of date. */
+ local_time = (long)st.st_mtime;
+ curl_easy_setopt(handle->curl, CURLOPT_TIMECONDITION, CURL_TIMECOND_IFMODSINCE);
+ curl_easy_setopt(handle->curl, CURLOPT_TIMEVALUE, local_time);
+ } else if(stat(tempfile, &st) == 0 && st.st_size > 0) {
+ /* assume its a partial package download. we do not support resuming of
+ * transfers on partially downloaded sync DBs. */
+ localf = fopen(tempfile, "ab");
+ curl_easy_setopt(handle->curl, CURLOPT_RESUME_FROM, (long)st.st_size);
+ _alpm_log(PM_LOG_DEBUG, "tempfile found, attempting continuation");
+ }
+
+ /* no destfile and no tempfile. start from scratch */
+ if(localf == NULL) {
+ localf = fopen(tempfile, "wb");
+ if(localf == NULL) {
+ goto cleanup;
+ }
+ }
+
+ /* this has to be set _after_ figuring out which file we're opening */
+ curl_easy_setopt(handle->curl, CURLOPT_WRITEDATA, localf);
+
+ /* 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"));
+
+ /* 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 */
+ if(handle->dlcb) {
+ handle->dlcb(filename, 0, 1);
+ }
+
+ /* perform transfer */
+ handle->curlerr = curl_easy_perform(handle->curl);
+
+ /* retrieve info about the state of the transfer */
+ curl_easy_getinfo(handle->curl, CURLINFO_HTTP_CODE, &httpresp);
+ 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);
+
+ /* 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(bytes_dl == 0 && timecond == 1) {
+ ret = 1;
+ unlink(tempfile);
+ goto cleanup;
+ }
+
+ if(handle->curlerr == CURLE_ABORTED_BY_CALLBACK) {
+ goto cleanup;
+ } else if(handle->curlerr != CURLE_OK) {
+ pm_errno = PM_ERR_LIBCURL;
+ _alpm_log(PM_LOG_ERROR, _("failed retrieving file '%s' from %s : %s\n"),
+ filename, hostname, curl_easy_strerror(handle->curlerr));
+ 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((remote_size != -1 && bytes_dl != -1) && bytes_dl != remote_size) {
+ pm_errno = PM_ERR_RETRIEVE;
+ _alpm_log(PM_LOG_ERROR, _("%s appears to be truncated: %jd/%jd bytes\n"),
+ filename, (intmax_t)bytes_dl, (intmax_t)remote_size);
+ goto cleanup;
+ }
+
+ fclose(localf);
+ localf = NULL;
+
+ /* set the times on the file to the same as that of the remote file */
+ if(remote_time != -1) {
+ struct timeval tv[2];
+ memset(&tv, 0, sizeof(tv));
+ tv[0].tv_sec = tv[1].tv_sec = remote_time;
+ 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(remote_time != -1) {
+ struct timeval tv[2];
+ memset(&tv, 0, sizeof(tv));
+ tv[0].tv_sec = tv[1].tv_sec = remote_time;
+ futimes(fileno(localf), tv);
+ }
+ fclose(localf);
+ }
+
+ /* 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) {