commit 7e0d0d8815ca60fbd5d54bdcb379e5b79de02f51
author Christopher Faulet <cfaulet@haproxy.com> Fri Jun 11 13:34:42 2021 +0200
committer Willy Tarreau <w@1wt.eu> Thu Jun 17 18:09:45 2021 +0200
tree aa1613e5a82c5d9aa8bcab4daa819a920d6d02ee
parent e3d6625c0cf78c79c6cdf524f3e3356e03aec4f1

BUG/MINOR: mux-fcgi: Expose SERVER_SOFTWARE parameter by default

As specified in the RFC3875 (section 4.1.17), this parameter must be set to
the name and version of the information server software making the CGI
request. Thus, it is now added to the default parameters defined by
HAProxy. It is set to the string "HAProxy $version".

This patch should fix the issue #1285 and must be backported as far as 2.2.

(cherry picked from commit 5cd0e528cf2bed6eb1f79582ef89cf1667337e46)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit b2a50298b1f6f46c943b77685142d59d3e69e193)
[wt: minor ctx adjustments]
Signed-off-by: Willy Tarreau <w@1wt.eu>

src/mux_fcgi.c

diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
index 68954c0..7cc69e4 100644
--- a/src/mux_fcgi.c
+++ b/src/mux_fcgi.c
@@ -32,6 +32,7 @@
 #include <haproxy/stream.h>
 #include <haproxy/stream_interface.h>
 #include <haproxy/trace.h>
+#include <haproxy/version.h>
 
 
 /* FCGI Connection flags (32 bits) */
@@ -186,7 +187,8 @@
 #define FCGI_SP_PATH_TRANS     0x00002000
 #define FCGI_SP_CONT_LEN       0x00004000
 #define FCGI_SP_HTTPS          0x00008000
-#define FCGI_SP_MASK           0x0000FFFF
+#define FCGI_SP_SRV_SOFT       0x00010000
+#define FCGI_SP_MASK           0x0001FFFF
 #define FCGI_SP_URI_MASK       (FCGI_SP_SCRIPT_NAME|FCGI_SP_PATH_INFO|FCGI_SP_REQ_QS)
 
 /* FCGI parameters used when PARAMS record is sent */
@@ -204,6 +206,7 @@
 	struct ist rem_addr;
 	struct ist rem_port;
 	struct ist cont_len;
+	struct ist srv_soft;
 	int https;
 	struct buffer *p;
 };
@@ -1401,6 +1404,12 @@
 		}
 	}
 
+	if (!(params->mask & FCGI_SP_SRV_SOFT)) {
+		params->srv_soft = ist2(b_tail(params->p), 0);
+		chunk_appendf(params->p, "HAProxy %s", haproxy_version);
+		params->srv_soft.len = b_tail(params->p) - params->srv_soft.ptr;
+	}
+
   end:
 	return 1;
   error:
@@ -1490,6 +1499,10 @@
 			p.n = ist("HTTPS");
 			p.v = ist("on");
 			goto encode;
+		case FCGI_SP_SRV_SOFT:
+			p.n = ist("SERVER_SOFTWARE");
+			p.v = params->srv_soft;
+			goto encode;
 		default:
 			goto skip;
 	}
@@ -1983,6 +1996,8 @@
 						params.mask |= FCGI_SP_PATH_TRANS;
 					else if (isteq(p.n, ist("https")))
 						params.mask |= FCGI_SP_HTTPS;
+					else if (isteq(p.n, ist("server_software")))
+						params.mask |= FCGI_SP_SRV_SOFT;
 				}
 				else if (isteq(p.n, ist("content-length"))) {
 					p.n = ist("CONTENT_LENGTH");
@@ -2061,6 +2076,7 @@
 	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SCRIPT_FILE) ||
 	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_PATH_TRANS)  ||
 	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_CONT_LEN)    ||
+	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_SRV_SOFT)    ||
 	    !fcgi_encode_default_param(fconn, fstrm, &params, &outbuf, FCGI_SP_HTTPS))
 		goto error;