httpd: use full size of iobuf[] when piping CGI data

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 4 insertions, 14 deletions

diff --git a/networking/httpd.c b/networking/httpd.c
index aa8ce8dcb..d44ec271a 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -259,18 +259,11 @@
 #if ENABLE_FEATURE_USE_SENDFILE
 # include <sys/sendfile.h>
 #endif
-/* amount of buffering in a pipe */
-#ifndef PIPE_BUF
-# define PIPE_BUF 4096
-#endif
 
 #define DEBUG 0
 
 #define IOBUF_SIZE 8192
-#define MAX_HTTP_HEADERS_SIZE ((8*1024) - 16)
-#if PIPE_BUF >= IOBUF_SIZE
-# error "PIPE_BUF >= IOBUF_SIZE"
-#endif
+#define MAX_HTTP_HEADERS_SIZE (32*1024)
 
 #define HEADER_READ_TIMEOUT 60
 
@@ -1413,10 +1406,10 @@ static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post
                                  * CGI may output a few first bytes and then wait
                                  * for POSTDATA without closing stdout.
                                  * With full_read we may wait here forever. */
-                                count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
+                                count = safe_read(fromCgi_rd, rbuf + out_cnt, IOBUF_SIZE - 8);
                                 if (count <= 0) {
                                         /* eof (or error) and there was no "HTTP",
-                                         * so write it, then write received data */
+                                         * send "HTTP/1.0 200 OK\r\n", then send received data */
                                         if (out_cnt) {
                                                 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
                                                 full_write(STDOUT_FILENO, rbuf, out_cnt);
@@ -1454,7 +1447,7 @@ static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post
                                         out_cnt = -1; /* buffering off */
                                 }
                         } else {
-                                count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
+                                count = safe_read(fromCgi_rd, rbuf, IOBUF_SIZE);
                                 if (count <= 0)
                                         break;  /* eof (or error) */
                         }
diff --git a/shell/hush.c b/shell/hush.c
index d745148f4..b3ae73b9b 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -363,9 +363,6 @@
 #ifndef F_DUPFD_CLOEXEC
 # define F_DUPFD_CLOEXEC F_DUPFD
 #endif
-#ifndef PIPE_BUF
-# define PIPE_BUF 4096  /* amount of buffering in a pipe */
-#endif
 
 #if ENABLE_FEATURE_SH_EMBEDDED_SCRIPTS && !(ENABLE_ASH || ENABLE_SH_IS_ASH || ENABLE_BASH_IS_ASH)
 # include "embedded_scripts.h"