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The headers buffer contains also potentially binary data the CGI program is
sending, and it needs to be sent out later. Use add_data() to cache data so
the cgi output does not get corrupted on first zero byte. add_data() still
always terminates the buffer with zero, so strstr() can used safely.
diff -ru mini_httpd-1.25.orig/mini_httpd.c mini_httpd-1.25/mini_httpd.c
--- mini_httpd-1.25.orig/mini_httpd.c 2016-07-07 06:02:52.000000000 +0300
+++ mini_httpd-1.25/mini_httpd.c 2016-11-09 12:01:19.025607907 +0200
@@ -1998,7 +1998,7 @@
add_str( &headers, &headers_size, &headers_len, (char*) 0 );
for (;;)
{
- r = read( rfd, buf, sizeof(buf) - 1 );
+ r = read( rfd, buf, sizeof(buf) );
if ( r < 0 && ( errno == EINTR || errno == EAGAIN ) )
{
sleep( 1 );
@@ -2009,8 +2009,7 @@
br = &(headers[headers_len]);
break;
}
- buf[r] = '\0';
- add_str( &headers, &headers_size, &headers_len, buf );
+ add_data( &headers, &headers_size, &headers_len, buf, r );
if ( ( br = strstr( headers, "\015\012\015\012" ) ) != (char*) 0 ||
( br = strstr( headers, "\012\012" ) ) != (char*) 0 )
break;
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