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curl_schannel: Removed buffer limit and optimized buffer strategy 

Since there are servers that seem to return very big encrypted
data packages, we need to be able to handle those without having
an internal size limit. To avoid the buffer growing to fast to
early the initial size was decreased and the minimum free space
in the buffer was decreased as well.
This commit is contained in:
Marc Hoersken 2012-10-06 13:59:28 +02:00
parent 07593b2422
commit fbf3560886
2 changed files with 7 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
lib/curl_schannel.c
View File

@ -284,7 +284,7 @@ schannel_connect_step2(struct connectdata *conn, int sockindex)
CURLcode code;
bool doread;
doread = (connssl->connecting_state != ssl_connect_2_writing)?TRUE:FALSE;
doread = (connssl->connecting_state != ssl_connect_2_writing) ? TRUE : FALSE;
infof(data, "schannel: SSL/TLS connection with %s port %hu (step 2/3)\n",
conn->host.name, conn->remote_port);
@ -302,12 +302,7 @@ schannel_connect_step2(struct connectdata *conn, int sockindex)
/* if we need a bigger buffer to read a full message, increase buffer now */
if(connssl->encdata_length - connssl->encdata_offset <
CURL_SCHANNEL_BUFFER_MIN_SIZE) {
if(connssl->encdata_length >= CURL_SCHANNEL_BUFFER_MAX_SIZE) {
failf(data, "schannel: memory buffer size limit reached");
return CURLE_OUT_OF_MEMORY;
}
CURL_SCHANNEL_BUFFER_FREE_SIZE) {
/* increase internal encrypted data buffer */
connssl->encdata_length *= CURL_SCHANNEL_BUFFER_STEP_FACTOR;
connssl->encdata_buffer = realloc(connssl->encdata_buffer,
@ -831,13 +826,7 @@ schannel_recv(struct connectdata *conn, int sockindex,
/* increase buffer in order to fit the requested amount of data */
while(connssl->encdata_length - connssl->encdata_offset <
CURL_SCHANNEL_BUFFER_MIN_SIZE || connssl->encdata_length < len) {
if(connssl->encdata_length >= CURL_SCHANNEL_BUFFER_MAX_SIZE) {
failf(data, "schannel: memory buffer size limit reached");
*err = CURLE_OUT_OF_MEMORY;
return -1;
}
CURL_SCHANNEL_BUFFER_FREE_SIZE || connssl->encdata_length < len) {
/* increase internal encrypted data buffer */
connssl->encdata_length *= CURL_SCHANNEL_BUFFER_STEP_FACTOR;
connssl->encdata_buffer = realloc(connssl->encdata_buffer,
@ -907,16 +896,10 @@ schannel_recv(struct connectdata *conn, int sockindex,
inbuf[1].cbBuffer);
/* increase buffer in order to fit the received amount of data */
size = inbuf[1].cbBuffer > CURL_SCHANNEL_BUFFER_MIN_SIZE ?
inbuf[1].cbBuffer : CURL_SCHANNEL_BUFFER_MIN_SIZE;
size = inbuf[1].cbBuffer > CURL_SCHANNEL_BUFFER_FREE_SIZE ?
inbuf[1].cbBuffer : CURL_SCHANNEL_BUFFER_FREE_SIZE;
while(connssl->decdata_length - connssl->decdata_offset < size ||
connssl->decdata_length < len) {
if(connssl->decdata_length >= CURL_SCHANNEL_BUFFER_MAX_SIZE) {
failf(data, "schannel: memory buffer size limit reached");
*err = CURLE_OUT_OF_MEMORY;
return -1;
}
/* increase internal decrypted data buffer */
connssl->decdata_length *= CURL_SCHANNEL_BUFFER_STEP_FACTOR;
connssl->decdata_buffer = realloc(connssl->decdata_buffer,

10
lib/curl_schannel.h
View File

@ -93,14 +93,8 @@
#endif
#ifdef BUFSIZE
#define CURL_SCHANNEL_BUFFER_INIT_SIZE BUFSIZE
#else
#define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
#endif
#define CURL_SCHANNEL_BUFFER_MIN_SIZE CURL_SCHANNEL_BUFFER_INIT_SIZE / 2
#define CURL_SCHANNEL_BUFFER_MAX_SIZE CURL_SCHANNEL_BUFFER_INIT_SIZE * 128
#define CURL_SCHANNEL_BUFFER_INIT_SIZE 4096
#define CURL_SCHANNEL_BUFFER_FREE_SIZE 1024
#define CURL_SCHANNEL_BUFFER_STEP_FACTOR 2