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vm/filecopy-agent: check for unpacker errors during transfer (#239)

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If unpacker encounter error it sends result header immediately - detect it as
soon as possible and do not send rest of file(s).
This commit is contained in:
Marek Marczykowski 2012-08-25 01:26:19 +02:00
parent 591a89c9d2
commit 2903de54ae
1 changed files with 55 additions and 16 deletions
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71
qubes_rpc/qfile-agent.c
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@ -9,6 +9,7 @@
#include <stdlib.h>
#include <ioall.h>
#include <unistd.h>
#include <errno.h>
#include <gui-fatal.h>
#include "filecopy.h"
#include "crc32.h"
@ -49,6 +50,37 @@ void do_notify_progress(long long total, int flag)
}
}
void wait_for_result()
{
struct result_header hdr;
if (!read_all(0, &hdr, sizeof(hdr))) {
if (errno == EAGAIN) {
// no result sent and stdin still open
return;
} else {
// other read error or EOF
exit(1); // hopefully remote has produced error message
}
}
if (hdr.error_code != 0) {
switch (hdr.error_code) {
case EEXIST:
gui_fatal("File copy: not overwriting existing file. Clean incoming dir, and retry copy");
break;
case EINVAL:
gui_fatal("File copy: Corrupted data from packer");
break;
default:
gui_fatal("File copy: %s",
strerror(hdr.error_code));
}
}
if (hdr.crc32 != crc32_sum) {
gui_fatal("File transfer failed: checksum mismatch");
}
}
void notify_progress(int size, int flag)
{
static long long total = 0;
@ -56,6 +88,11 @@ void notify_progress(int size, int flag)
total += size;
if (total > prev_total + PROGRESS_NOTIFY_DELTA
|| (flag != PROGRESS_FLAG_NORMAL)) {
// check for possible error from qfile-unpacker; if error occured,
// exit() will be called, so don't bother with current state
// (notify_progress can be called as callback from copy_file())
if (flag == PROGRESS_FLAG_NORMAL)
wait_for_result();
do_notify_progress(total, flag);
prev_total = total;
}
@ -64,9 +101,12 @@ void notify_progress(int size, int flag)
void write_headers(struct file_header *hdr, char *filename)
{
if (!write_all_with_crc(1, hdr, sizeof(*hdr))
|| !write_all_with_crc(1, filename, hdr->namelen))
|| !write_all_with_crc(1, filename, hdr->namelen)) {
set_block(0);
wait_for_result();
exit(1);
}
}
int single_file_processor(char *filename, struct stat *st)
{
@ -89,14 +129,16 @@ int single_file_processor(char *filename, struct stat *st)
hdr.filelen = st->st_size;
write_headers(&hdr, filename);
ret = copy_file(1, fd, hdr.filelen, &crc32_sum);
// if COPY_FILE_WRITE_ERROR, hopefully remote will produce a message
if (ret != COPY_FILE_OK) {
if (ret != COPY_FILE_WRITE_ERROR)
gui_fatal("Copying file %s: %s", filename,
copy_file_status_to_str(ret));
else
else {
set_block(0);
wait_for_result();
exit(1);
}
}
close(fd);
}
if (S_ISDIR(mode)) {
@ -109,9 +151,14 @@ int single_file_processor(char *filename, struct stat *st)
gui_fatal("readlink %s", filename);
hdr.filelen = st->st_size + 1;
write_headers(&hdr, filename);
if (!write_all_with_crc(1, name, st->st_size + 1))
if (!write_all_with_crc(1, name, st->st_size + 1)) {
set_block(0);
wait_for_result();
exit(1);
}
}
// check for possible error from qfile-unpacker
wait_for_result();
return 0;
}
@ -147,7 +194,6 @@ int do_fs_walk(char *file)
void notify_end_and_wait_for_result()
{
struct result_header hdr;
struct file_header end_hdr;
/* nofity end of transfer */
@ -156,17 +202,8 @@ void notify_end_and_wait_for_result()
end_hdr.filelen = 0;
write_all_with_crc(1, &end_hdr, sizeof(end_hdr));
/* wait for result */
if (!read_all(0, &hdr, sizeof(hdr))) {
exit(1); // hopefully remote has produced error message
}
if (hdr.error_code != 0) {
gui_fatal("Error writing files: %s",
strerror(hdr.error_code));
}
if (hdr.crc32 != crc32_sum) {
gui_fatal("File transfer failed: checksum mismatch");
}
set_block(0);
wait_for_result();
}
char *get_abs_path(char *cwd, char *pathname)
@ -186,6 +223,8 @@ int main(int argc, char **argv)
char *sep;
signal(SIGPIPE, SIG_IGN);
// this will allow checking for possible feedback packet in the middle of transfer
set_nonblock(0);
notify_progress(0, PROGRESS_FLAG_INIT);
crc32_sum = 0;
cwd = getcwd(NULL, 0);