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Diffstat (limited to 'lib/libalpm/dload.c')
-rw-r--r--lib/libalpm/dload.c239
1 files changed, 144 insertions, 95 deletions
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index 10be5e9d..6bf9b4db 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -25,6 +25,9 @@
#include <errno.h>
#include <string.h>
#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
#include <signal.h>
#include <limits.h>
/* the following two are needed on BSD for libfetch */
@@ -59,7 +62,7 @@ static char *get_filename(const char *url) {
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;
+ 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);
@@ -69,37 +72,13 @@ static char *get_destfile(const char *path, const char *filename) {
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;
+ 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);
}
-/* Build a 'struct url' from an url. */
-static struct url *url_for_string(const char *url)
-{
- struct url *ret = NULL;
- ret = fetchParseURL(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 const char *gethost(struct url *fileurl)
{
const char *host = _("disk");
@@ -109,75 +88,126 @@ static const char *gethost(struct url *fileurl)
return(host);
}
+int dload_interrupted;
+static RETSIGTYPE 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,
- time_t mtimeold, time_t *mtimenew) {
- fetchIO *dlf = NULL;
+ int force) {
FILE *localf = NULL;
- struct url_stat ust;
struct stat st;
- int chk_resume = 0, ret = 0;
- size_t dl_thisfile = 0;
+ int ret = 0;
+ off_t dl_thisfile = 0;
ssize_t nread = 0;
char *tempfile, *destfile, *filename;
- struct sigaction new_action, old_action;
- struct url *fileurl = url_for_string(url);
- char buffer[PM_DLBUF_LEN];
+ struct sigaction sig_pipe[2], sig_int[2];
- if(!fileurl) {
- return(-1);
- }
+ 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) {
- return(-1);
+ _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);
- if(mtimeold) {
- fileurl->last_modified = mtimeold;
+ fileurl = fetchParseURL(url);
+ if(!fileurl) {
+ _alpm_log(PM_LOG_ERROR, _("url '%s' is invalid\n"), url);
+ RET_ERR(PM_ERR_LIBFETCH, -1);
}
- /* pass the raw filename for passing to the callback function */
- _alpm_log(PM_LOG_DEBUG, "using '%s' for download progress\n", filename);
+ destfile = get_destfile(localpath, filename);
+ tempfile = get_tempfile(localpath, 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;
+ _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");
- chk_resume = 1;
+ } 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 {
- fileurl->offset = (off_t)0;
- dl_thisfile = 0;
+ _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"));
- /* libfetch does not reset the error code */
- fetchLastErrCode = 0;
-
/* 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. */
- new_action.sa_handler = SIG_IGN;
- sigemptyset(&new_action.sa_mask);
- sigaction(SIGPIPE, NULL, &old_action);
- sigaction(SIGPIPE, &new_action, NULL);
-
- dlf = fetchXGet(fileurl, &ust, (handle->nopassiveftp ? "i" : "pi"));
-
- if(fetchLastErrCode == FETCH_UNCHANGED) {
- _alpm_log(PM_LOG_DEBUG, "mtimes are identical, skipping %s\n", filename);
+ 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: %"PRId64" local_size: %"PRId64" compare: %"PRId64"\n",
+ ust.size, local_size, 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;
@@ -189,17 +219,14 @@ static int download_internal(const char *url, const char *localpath,
_alpm_log(PM_LOG_DEBUG, "connected to %s successfully\n", fileurl->host);
}
- if(ust.mtime && mtimenew) {
- *mtimenew = ust.mtime;
+ 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 %"PRId64"\n", fileurl->offset);
}
- 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);
@@ -207,7 +234,9 @@ static int download_internal(const char *url, const char *localpath,
dl_thisfile = 0;
localf = fopen(tempfile, "wb");
if(localf == NULL) { /* still null? */
- _alpm_log(PM_LOG_ERROR, _("cannot write to file '%s'\n"), tempfile);
+ pm_errno = PM_ERR_RETRIEVE;
+ _alpm_log(PM_LOG_ERROR, _("error writing to file '%s': %s\n"),
+ tempfile, strerror(errno));
ret = -1;
goto cleanup;
}
@@ -219,15 +248,15 @@ static int download_internal(const char *url, const char *localpath,
}
while((nread = fetchIO_read(dlf, buffer, PM_DLBUF_LEN)) > 0) {
+ check_stop();
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;
- }
+ nwritten = fwrite(buffer, 1, nread, localf);
+ if((nwritten != 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;
@@ -262,36 +291,60 @@ static int download_internal(const char *url, const char *localpath,
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:
- /* restore any existing SIGPIPE signal handler */
- sigaction(SIGPIPE, &old_action, NULL);
-
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,
- time_t mtimeold, time_t *mtimenew) {
+ int force) {
if(handle->fetchcb == NULL) {
#if defined(INTERNAL_DOWNLOAD)
- return(download_internal(url, localpath, mtimeold, mtimenew));
+ return(download_internal(url, localpath, force));
#else
RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
#endif
} else {
- int ret = handle->fetchcb(url, localpath, mtimeold, mtimenew);
+ int ret = handle->fetchcb(url, localpath, force);
if(ret == -1) {
RET_ERR(PM_ERR_EXTERNAL_DOWNLOAD, -1);
}
@@ -301,19 +354,15 @@ static int download(const char *url, const char *localpath,
/*
* 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.
* - servers must be a list of urls WITHOUT trailing slashes.
*
* RETURN: 0 for successful download
- * 1 if the mtimes are identical
+ * 1 if the files 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)
+ int force)
{
alpm_list_t *i;
int ret = -1;
@@ -323,14 +372,14 @@ int _alpm_download_single_file(const char *filename,
for(i = servers; i; i = i->next) {
const char *server = i->data;
char *fileurl = NULL;
- int len;
+ 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, mtimeold, mtimenew);
+ ret = download(fileurl, localpath, force);
FREE(fileurl);
if(ret != -1) {
break;
@@ -349,7 +398,7 @@ int _alpm_download_files(alpm_list_t *files,
for(lp = files; lp; lp = lp->next) {
char *filename = lp->data;
if(_alpm_download_single_file(filename, servers,
- localpath, 0, NULL) == -1) {
+ localpath, 0) == -1) {
ret++;
}
}
@@ -376,7 +425,7 @@ char SYMEXPORT *alpm_fetch_pkgurl(const char *url)
cachedir = _alpm_filecache_setup();
/* download the file */
- ret = download(url, cachedir, 0, NULL);
+ ret = download(url, cachedir, 0);
if(ret == -1) {
_alpm_log(PM_LOG_WARNING, _("failed to download %s\n"), url);
return(NULL);

Copyright © 2002-2022 Judd Vinet and Aaron Griffin. Copyright © 2022 Erich Eckner.
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