Experimental decoupling of socketbinders and daemons in ucspi servers.

 Rewrite of s6-ipcserver as a small wrapper.
 s6-tcpserver4 and s6-tcpserver6 will follow.

1 files changed, 49 insertions, 0 deletions

diff --git a/src/conn-tools/s6-tcpserver4-socketbinder.c b/src/conn-tools/s6-tcpserver4-socketbinder.c
new file mode 100644
index 0000000..86f5390
--- /dev/null
+++ b/src/conn-tools/s6-tcpserver4-socketbinder.c
@@ -0,0 +1,49 @@
+/* ISC license. */
+
+#include <unistd.h>
+#include <skalibs/uint16.h>
+#include <skalibs/uint.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/fmtscan.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/socket.h>
+
+#define USAGE "s6-tcpserver4-socketbinder [ -d | -D ] [ -b backlog ] ip4 port prog..."
+#define dieusage() strerr_dieusage(100, USAGE)
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  unsigned int backlog = 20 ;
+  int flagreuse = 1 ;
+  char ip[4] ;
+  uint16 port ;
+  PROG = "s6-tcpserver4-socketbinder" ;
+  {
+    subgetopt_t l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      register int opt = subgetopt_r(argc, argv, "Ddb:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'D' : flagreuse = 0 ; break ;
+        case 'd' : flagreuse = 1 ; break ;
+        case 'b' : if (!uint0_scan(l.arg, &backlog)) dieusage() ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+  if (argc < 3) dieusage() ;
+  if (!ip4_scan(argv[0], ip) || !uint160_scan(argv[1], &port)) dieusage() ;
+  close(0) ;
+  if (socket_tcp4()) strerr_diefu1sys(111, "create socket") ;
+  if ((flagreuse ? socket_bind4_reuse(0, ip, port) : socket_bind4(0, ip, port)) < 0)
+    strerr_diefu5sys(111, "bind to ", argv[0], ":", argv[1], " ") ;
+  if (socket_listen(0, backlog) < 0)
+    strerr_diefu5sys(111, "listen to ", argv[0], ":", argv[1], " ") ;
+
+  pathexec_run(argv[2], argv + 2, envp) ;
+  strerr_dieexec(111, argv[2]) ;
+}