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libvirt/xend-content-buf.patch

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commit 211dd1e9c54a9ba92e2e648acacbc18981374073
Author: Jim Fehlig <jfehlig@novell.com>
Date: Wed Jun 2 18:07:17 2010 -0600
Allocate buffer to hold xend response
There are cases when a response from xend can exceed 4096 bytes, in
which case anything beyond 4096 is ignored. This patch changes the
current fixed-size, stack-allocated buffer to a dynamically allocated
buffer based on Content-Length in HTTP header.
diff --git a/src/xen/xend_internal.c b/src/xen/xend_internal.c
index e763bad..0c1a738 100644
--- a/src/xen/xend_internal.c
+++ b/src/xen/xend_internal.c
@@ -302,17 +302,19 @@ istartswith(const char *haystack, const char *needle)
* xend_req:
* @fd: the file descriptor
* @content: the buffer to store the content
- * @n_content: the size of the buffer
*
* Read the HTTP response from a Xen Daemon request.
+ * If the response contains content, memory is allocated to
+ * hold the content.
*
- * Returns the HTTP return code.
+ * Returns the HTTP return code and @content is set to the
+ * allocated memory containing HTTP content.
*/
static int
-xend_req(int fd, char *content, size_t n_content)
+xend_req(int fd, char **content)
{
char buffer[4096];
- int content_length = -1;
+ int content_length = 0;
int retcode = 0;
while (sreads(fd, buffer, sizeof(buffer)) > 0) {
@@ -325,19 +327,17 @@ xend_req(int fd, char *content, size_t n_content)
retcode = atoi(buffer + 9);
}
- if (content_length > -1) {
+ if (content_length > 0) {
ssize_t ret;
- if ((unsigned int) content_length > (n_content + 1))
- content_length = n_content - 1;
+ if (VIR_ALLOC_N(*content, content_length) < 0 ) {
+ virReportOOMError();
+ return -1;
+ }
- ret = sread(fd, content, content_length);
+ ret = sread(fd, *content, content_length);
if (ret < 0)
return -1;
-
- content[ret] = 0;
- } else {
- content[0] = 0;
}
return retcode;
@@ -348,7 +348,6 @@ xend_req(int fd, char *content, size_t n_content)
* @xend: pointer to the Xen Daemon structure
* @path: the path used for the HTTP request
* @content: the buffer to store the content
- * @n_content: the size of the buffer
*
* Do an HTTP GET RPC with the Xen Daemon
*
@@ -356,7 +355,7 @@ xend_req(int fd, char *content, size_t n_content)
*/
static int
xend_get(virConnectPtr xend, const char *path,
- char *content, size_t n_content)
+ char **content)
{
int ret;
int s = do_connect(xend);
@@ -373,14 +372,15 @@ xend_get(virConnectPtr xend, const char *path,
"Accept-Encoding: identity\r\n"
"Content-Type: application/x-www-form-urlencoded\r\n" "\r\n");
- ret = xend_req(s, content, n_content);
+ ret = xend_req(s, content);
close(s);
if (((ret < 0) || (ret >= 300)) &&
((ret != 404) || (!STRPREFIX(path, "/xend/domain/")))) {
virXendError(VIR_ERR_GET_FAILED,
_("%d status from xen daemon: %s:%s"),
- ret, path, content);
+ ret, path,
+ content ? *content: "NULL");
}
return ret;
@@ -392,8 +392,6 @@ xend_get(virConnectPtr xend, const char *path,
* @xend: pointer to the Xen Daemon structure
* @path: the path used for the HTTP request
* @ops: the information sent for the POST
- * @content: the buffer to store the content
- * @n_content: the size of the buffer
*
* Do an HTTP POST RPC with the Xen Daemon, this usually makes changes at the
* Xen level.
@@ -401,10 +399,10 @@ xend_get(virConnectPtr xend, const char *path,
* Returns the HTTP return code or -1 in case or error.
*/
static int
-xend_post(virConnectPtr xend, const char *path, const char *ops,
- char *content, size_t n_content)
+xend_post(virConnectPtr xend, const char *path, const char *ops)
{
char buffer[100];
+ char *err_buf = NULL;
int ret;
int s = do_connect(xend);
@@ -425,26 +423,28 @@ xend_post(virConnectPtr xend, const char *path, const char *ops,
swrites(s, "\r\n\r\n");
swrites(s, ops);
- ret = xend_req(s, content, n_content);
+ ret = xend_req(s, &err_buf);
close(s);
if ((ret < 0) || (ret >= 300)) {
virXendError(VIR_ERR_POST_FAILED,
- _("xend_post: error from xen daemon: %s"), content);
- } else if ((ret == 202) && (strstr(content, "failed") != NULL)) {
+ _("xend_post: error from xen daemon: %s"), err_buf);
+ } else if ((ret == 202) && err_buf && (strstr(err_buf, "failed") != NULL)) {
virXendError(VIR_ERR_POST_FAILED,
- _("xend_post: error from xen daemon: %s"), content);
+ _("xend_post: error from xen daemon: %s"), err_buf);
ret = -1;
- } else if (((ret >= 200) && (ret <= 202)) && (strstr(content, "xend.err") != NULL)) {
+ } else if (((ret >= 200) && (ret <= 202)) && err_buf &&
+ (strstr(err_buf, "xend.err") != NULL)) {
/* This is to catch case of things like 'virsh dump Domain-0 foo'
* which returns a success code, but the word 'xend.err'
* in body to indicate error :-(
*/
virXendError(VIR_ERR_POST_FAILED,
- _("xend_post: error from xen daemon: %s"), content);
+ _("xend_post: error from xen daemon: %s"), err_buf);
ret = -1;
}
+ VIR_FREE(err_buf);
return ret;
}
#endif /* ! PROXY */
@@ -487,8 +487,6 @@ http2unix(int ret)
* xend_op_ext:
* @xend: pointer to the Xen Daemon structure
* @path: path for the object
- * @error: buffer for the error output
- * @n_error: size of @error
* @key: the key for the operation
* @ap: input values to pass to the operation
*
@@ -497,8 +495,7 @@ http2unix(int ret)
* Returns 0 in case of success, -1 in case of failure.
*/
static int
-xend_op_ext(virConnectPtr xend, const char *path, char *error,
- size_t n_error, const char *key, va_list ap)
+xend_op_ext(virConnectPtr xend, const char *path, const char *key, va_list ap)
{
const char *k = key, *v;
virBuffer buf = VIR_BUFFER_INITIALIZER;
@@ -524,7 +521,7 @@ xend_op_ext(virConnectPtr xend, const char *path, char *error,
}
content = virBufferContentAndReset(&buf);
- ret = http2unix(xend_post(xend, path, content, error, n_error));
+ ret = http2unix(xend_post(xend, path, content));
VIR_FREE(content);
return ret;
@@ -535,8 +532,6 @@ xend_op_ext(virConnectPtr xend, const char *path, char *error,
* xend_op:
* @xend: pointer to the Xen Daemon structure
* @name: the domain name target of this operation
- * @error: buffer for the error output
- * @n_error: size of @error
* @key: the key for the operation
* @ap: input values to pass to the operation
* @...: input values to pass to the operation
@@ -550,14 +545,13 @@ static int ATTRIBUTE_SENTINEL
xend_op(virConnectPtr xend, const char *name, const char *key, ...)
{
char buffer[1024];
- char error[1024];
va_list ap;
int ret;
snprintf(buffer, sizeof(buffer), "/xend/domain/%s", name);
va_start(ap, key);
- ret = xend_op_ext(xend, buffer, error, sizeof(error), key, ap);
+ ret = xend_op_ext(xend, buffer, key, ap);
va_end(ap);
return ret;
@@ -581,21 +575,29 @@ static struct sexpr *sexpr_get(virConnectPtr xend, const char *fmt, ...)
static struct sexpr *
sexpr_get(virConnectPtr xend, const char *fmt, ...)
{
- char buffer[4096];
+ char *buffer = NULL;
char path[1024];
va_list ap;
int ret;
+ struct sexpr *res = NULL;
va_start(ap, fmt);
vsnprintf(path, sizeof(path), fmt, ap);
va_end(ap);
- ret = xend_get(xend, path, buffer, sizeof(buffer));
+ ret = xend_get(xend, path, &buffer);
ret = http2unix(ret);
if (ret == -1)
- return NULL;
+ goto cleanup;
+
+ if (buffer == NULL)
+ goto cleanup;
+
+ res = string2sexpr(buffer);
- return string2sexpr(buffer);
+cleanup:
+ VIR_FREE(buffer);
+ return res;
}
/**
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