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authorGravatar Adam Chlipala <adamc@csail.mit.edu>2016-12-31 15:30:47 -0500
committerGravatar GitHub <noreply@github.com>2016-12-31 15:30:47 -0500
commit71251a24df30b138c3d099c6f375045160b9533d (patch)
tree5e8be8f81673b75cc60e8be6f573c9ae8d4e86c2 /src/c/fastcgi.c
parentab8f786b06be01781bd2a4c7a80b4765d2886e8c (diff)
parent4d37351eab0ea02ca065f4415aa6ac556a8c7820 (diff)
Merge pull request #60 from bbarenblat/master
FastCGI: Track request IDs during processing
Diffstat (limited to 'src/c/fastcgi.c')
-rw-r--r--src/c/fastcgi.c45
1 files changed, 44 insertions, 1 deletions
diff --git a/src/c/fastcgi.c b/src/c/fastcgi.c
index cda3e1f6..c37debf7 100644
--- a/src/c/fastcgi.c
+++ b/src/c/fastcgi.c
@@ -1,5 +1,7 @@
#include "config.h"
+#include <assert.h>
+#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
@@ -20,6 +22,8 @@
#include "fastcgi.h"
+#define THREAD_LOCAL __thread
+
extern uw_app uw_application;
typedef struct {
@@ -44,6 +48,21 @@ typedef struct {
int available, used, sock;
} FCGI_Input;
+// The FastCGI request ID corresponding to the request being handled by the
+// current worker thread. (Each worker thread can only handle one request at a
+// time.)
+static THREAD_LOCAL int current_request_id;
+
+// Reads the FastCGI request ID from a FastCGI record. The result is guaranteed
+// to be in the range [0, 2^16); this function returns an int to avoid C type
+// promotion insanity.
+static int fastcgi_request_id(const FCGI_Record* const r) {
+ const int requestid = r->requestIdB1 << 8 | r->requestIdB0;
+ assert(requestid >= 0);
+ assert(requestid <= UINT16_MAX);
+ return requestid;
+}
+
static FCGI_Output *fastcgi_output() {
FCGI_Output *o = malloc(sizeof(FCGI_Output));
@@ -70,7 +89,9 @@ static int fastcgi_send(FCGI_Output *o,
unsigned char type,
unsigned short contentLength) {
o->r.type = type;
- o->r.requestIdB1 = o->r.requestIdB0 = 0;
+ assert(current_request_id <= UINT16_MAX);
+ o->r.requestIdB1 = current_request_id >> 8;
+ o->r.requestIdB0 = current_request_id & 0x000000ff;
o->r.contentLengthB1 = contentLength >> 8;
o->r.contentLengthB0 = contentLength & 255;
return uw_really_send(o->sock, &o->r, sizeof(o->r) - 65535 + contentLength);
@@ -356,6 +377,10 @@ static void *worker(void *data) {
goto done;
}
+ // Save the FastCGI request ID this worker is handling so that fastcgi_send
+ // can include it in its response.
+ current_request_id = fastcgi_request_id(r);
+
if (r->type != FCGI_BEGIN_REQUEST) {
write_stderr(out, "First message is not BEGIN_REQUEST\n");
goto done;
@@ -373,6 +398,15 @@ static void *worker(void *data) {
goto done;
}
+ if (fastcgi_request_id(r) != current_request_id) {
+ write_stderr(out,
+ "Ignoring environment variables for request %d (current"
+ " request has id %d)\n",
+ fastcgi_request_id(r),
+ current_request_id);
+ continue;
+ }
+
if (r->type != FCGI_PARAMS) {
write_stderr(out, "Expected FCGI_PARAMS but got %d\n", r->type);
goto done;
@@ -428,6 +462,15 @@ static void *worker(void *data) {
goto done;
}
+ if (fastcgi_request_id(r) != current_request_id) {
+ write_stderr(out,
+ "Ignoring STDIN for request %d (current request has id"
+ " %d)\n",
+ fastcgi_request_id(r),
+ current_request_id);
+ continue;
+ }
+
if (r->type != FCGI_STDIN) {
write_stderr(out, "Expected FCGI_STDIN but got %d\n", r->type);
goto done;