From 7c5d186df1f7f00567660354905435cedffc3e20 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Thu, 25 Jun 2026 09:01:50 +0000
Subject:  Implement fastcgi, except the protocol itself

---
 src/tipideed/fastcgi.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 src/tipideed/fastcgi.c

(limited to 'src/tipideed/fastcgi.c')

diff --git a/src/tipideed/fastcgi.c b/src/tipideed/fastcgi.c
new file mode 100644
index 0000000..5d5debf
--- /dev/null
+++ b/src/tipideed/fastcgi.c
@@ -0,0 +1,66 @@
+/* ISC license. */
+
+#include <stdint.h>
+#include <unistd.h>
+#include <strings.h>
+
+#include <skalibs/uint16.h>
+#include <skalibs/fmtscan.h>
+#include <skalibs/tai.h>
+#include <skalibs/buffer.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/socket.h>
+#include <skalibs/ip46.h>
+#include <skalibs/unix-timed.h>
+
+#include <tipidee/tipidee.h>
+#include "tipideed-internal.h"
+
+#define putit(b, s, deadline) if (buffer_timed_puts_g(b, s, deadline) == -1) die500sys(rql, 111, docroot, "write to ", fn)
+
+static void do_fastcgi (tipidee_rql const *rql, int fd, char const *sub, char const *docroot, tipidee_headers const *hdr, char const *body, size_t bodylen, tain const *deadline, char const *fn)
+{
+  char buf[4096] ;
+  buffer b = BUFFER_INIT(&buffer_write, fd, buf, 4096) ;
+  _exit(0) ;
+}
+
+static void fastcgi_unix (tipidee_rql const *rql, char const *socketpath, char const *sub, char const *docroot, tipidee_headers const *hdr, char const *body, size_t bodylen)
+{
+  tain deadline ;
+  int fd = ipc_stream_nbcoe() ;
+  if (fd == -1) die500sys(rql, 111, docroot, "create socket") ;
+  tain_add_g(&deadline, &g.readtto) ;
+  if (!ipc_timed_connect_g(fd, socketpath, &deadline)) die500sys(rql, 111, docroot, "connect to ", socketpath) ;
+  do_fastcgi(rql, fd, sub, docroot, hdr, body, bodylen, &deadline, socketpath) ;
+  fd_close(fd) ;
+}
+
+static inline void fastcgi_tcp (tipidee_rql const *rql, char const *ip, uint16_t port, int is6, char const *sub, char const *docroot, tipidee_headers const *hdr, char const *body, size_t bodylen)
+{
+  tain deadline ;
+  size_t m = 0 ;
+  int fd = socket_tcp46_nbcoe(is6) ;
+  char fmt[IP6_FMT + UINT16_FMT + 2] ;
+  if (fd == -1) die500sys(rql, 111, docroot, "create socket") ;
+  tain_add_g(&deadline, &g.readtto) ;
+  if (is6) fmt[m++] = '[' ;
+  m += is6 ? ip6_fmt(fmt + m, ip) : ip4_fmt(fmt + m, ip) ;
+  if (is6) fmt[m++] = ']' ;
+  fmt[m++] = ':' ;
+  m += uint16_fmt(fmt + m, port) ;
+  fmt[m++] = 0 ;
+  
+  if (!(is6 ? socket_deadlineconnstamp6_g(fd, ip, port, &deadline) : socket_deadlineconnstamp4_g(fd, ip, port, &deadline)))
+    die500sys(rql, 111, docroot, "connect to ", fmt) ;
+  do_fastcgi(rql, fd, sub, docroot, hdr, body, bodylen, &deadline, fmt) ;
+  fd_close(fd) ;
+}
+
+void fastcgi (tipidee_rql const *rql, tipidee_redirection const *rd, char const *docroot, tipidee_headers const *hdr, char const *body, size_t bodylen)
+{
+  if (rd->flags & TIPIDEE_REDIR_ISINET)
+    fastcgi_tcp(rql, rd->addr, rd->port, !!(rd->flags & TIPIDEE_REDIR_ISV6), rd->sub, docroot, hdr, body, bodylen) ;
+  else
+    fastcgi_unix(rql, rd->addr, rd->sub, docroot, hdr, body, bodylen) ;
+}
-- 
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