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authorJan Kiszka <jan.kiszka@siemens.com>2009-06-24 14:42:30 +0200
committerAnthony Liguori <aliguori@us.ibm.com>2009-06-29 08:52:47 -0500
commit9367964ae21d2a41517c76c87dd26c79abcfe937 (patch)
treec888654b95b43ec9cef82dd5af662cae2b45badf /slirp/tftp.c
parent20c24bf24ddf91fd9ab5d827fdd0fe14397de412 (diff)
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slirp: tftp: Rework filename handling
This changes the filename handling from a static buffer in tftp_session for the client-provided name + prefix to a dynamically allocated buffer that keeps the combined path in one place. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'slirp/tftp.c')
-rw-r--r--slirp/tftp.c38
1 files changed, 16 insertions, 22 deletions
diff --git a/slirp/tftp.c b/slirp/tftp.c
index 8351908..31a1e25 100644
--- a/slirp/tftp.c
+++ b/slirp/tftp.c
@@ -27,7 +27,7 @@
struct tftp_session {
int in_use;
- char filename[TFTP_FILENAME_MAX];
+ char *filename;
struct in_addr client_ip;
u_int16_t client_port;
@@ -47,6 +47,7 @@ static void tftp_session_update(struct tftp_session *spt)
static void tftp_session_terminate(struct tftp_session *spt)
{
+ qemu_free(spt->filename);
spt->in_use = 0;
}
@@ -62,8 +63,10 @@ static int tftp_session_allocate(struct tftp_t *tp)
goto found;
/* sessions time out after 5 inactive seconds */
- if ((int)(curtime - spt->timestamp) > 5000)
+ if ((int)(curtime - spt->timestamp) > 5000) {
+ qemu_free(spt->filename);
goto found;
+ }
}
return -1;
@@ -103,15 +106,8 @@ static int tftp_read_data(struct tftp_session *spt, u_int16_t block_nr,
{
int fd;
int bytes_read = 0;
- char buffer[1024];
- int n;
-
- n = snprintf(buffer, sizeof(buffer), "%s/%s",
- tftp_prefix, spt->filename);
- if (n >= sizeof(buffer))
- return -1;
- fd = open(buffer, O_RDONLY | O_BINARY);
+ fd = open(spt->filename, O_RDONLY | O_BINARY);
if (fd < 0) {
return -1;
@@ -274,6 +270,7 @@ static void tftp_handle_rrq(struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
int s, k;
+ size_t prefix_len;
char *req_fname;
s = tftp_session_allocate(tp);
@@ -294,8 +291,13 @@ static void tftp_handle_rrq(struct tftp_t *tp, int pktlen)
k = 0;
pktlen -= ((uint8_t *)&tp->x.tp_buf[0] - (uint8_t *)tp);
+ /* prepend tftp_prefix */
+ prefix_len = strlen(tftp_prefix);
+ spt->filename = qemu_malloc(prefix_len + TFTP_FILENAME_MAX + 1);
+ memcpy(spt->filename, tftp_prefix, prefix_len);
+
/* get name */
- req_fname = spt->filename;
+ req_fname = spt->filename + prefix_len;
while (1) {
if (k >= TFTP_FILENAME_MAX || k >= pktlen) {
@@ -322,10 +324,8 @@ static void tftp_handle_rrq(struct tftp_t *tp, int pktlen)
k += 6; /* skipping octet */
/* do sanity checks on the filename */
-
- if ((spt->filename[0] != '/')
- || (spt->filename[strlen((char *)spt->filename) - 1] == '/')
- || strstr((char *)spt->filename, "/../")) {
+ if (req_fname[0] != '/' || req_fname[strlen(req_fname) - 1] == '/' ||
+ strstr(req_fname, "/../")) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
@@ -360,13 +360,7 @@ static void tftp_handle_rrq(struct tftp_t *tp, int pktlen)
struct stat stat_p;
if (tsize == 0) {
- char buffer[1024];
- int len;
-
- len = snprintf(buffer, sizeof(buffer), "%s/%s",
- tftp_prefix, spt->filename);
-
- if (stat(buffer, &stat_p) == 0)
+ if (stat(spt->filename, &stat_p) == 0)
tsize = stat_p.st_size;
else {
tftp_send_error(spt, 1, "File not found", tp);