From da4000da5e0253b10d59fdc04baafdadd43ca4fd Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sat, 10 Sep 2016 14:39:33 +0000
Subject:  Allow s6-ipcserver-socketbinder to create SOCK_DGRAM sockets and to
 not listen() (suggested by Daniel Kahn Gillmor)

---
 src/conn-tools/s6-ipcserver-socketbinder.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/conn-tools/s6-ipcserver-socketbinder.c b/src/conn-tools/s6-ipcserver-socketbinder.c
index b5a32f3..523b118 100644
--- a/src/conn-tools/s6-ipcserver-socketbinder.c
+++ b/src/conn-tools/s6-ipcserver-socketbinder.c
@@ -2,6 +2,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/socket.h>
 #include <unistd.h>
 #include <skalibs/uint.h>
 #include <skalibs/sgetopt.h>
@@ -9,24 +10,27 @@
 #include <skalibs/djbunix.h>
 #include <skalibs/webipc.h>
 
-#define USAGE "s6-ipcserver-socketbinder [ -d | -D ] [ -b backlog ] path prog..."
+#define USAGE "s6-ipcserver-socketbinder [ -d | -D ] [ -b backlog ] [ -M | -m ] path prog..."
 #define dieusage() strerr_dieusage(100, USAGE)
 
 int main (int argc, char const *const *argv, char const *const *envp)
 {
-  unsigned int backlog = 20 ;
+  unsigned int backlog = SOMAXCONN ;
   int flagreuse = 1 ;
+  int flagdgram = 0 ;
   PROG = "s6-ipcserver-socketbinder" ;
   {
     subgetopt_t l = SUBGETOPT_ZERO ;
     for (;;)
     {
-      register int opt = subgetopt_r(argc, argv, "Ddb:", &l) ;
+      register int opt = subgetopt_r(argc, argv, "DdMmb:", &l) ;
       if (opt == -1) break ;
       switch (opt)
       {
         case 'D' : flagreuse = 0 ; break ;
         case 'd' : flagreuse = 1 ; break ;
+        case 'M' : flagdgram = 0 ; break ;
+        case 'm' : flagdgram = 1 ; break ;
         case 'b' : if (!uint0_scan(l.arg, &backlog)) dieusage() ; break ;
         default : dieusage() ;
       }
@@ -35,14 +39,15 @@ int main (int argc, char const *const *argv, char const *const *envp)
   }
   if (argc < 2) dieusage() ;
   close(0) ;
-  if (ipc_stream()) strerr_diefu1sys(111, "create socket") ;
+  if (flagdgram ? ipc_datagram() : ipc_stream()) strerr_diefu1sys(111, "create socket") ;
   {
     mode_t m = umask(0) ;
     if ((flagreuse ? ipc_bind_reuse(0, argv[0]) : ipc_bind(0, argv[0])) < 0)
       strerr_diefu2sys(111, "bind to ", argv[0]) ;
     umask(m) ;
   }
-  if (ipc_listen(0, backlog) < 0) strerr_diefu2sys(111, "listen to ", argv[0]) ;
+  if (backlog && ipc_listen(0, backlog) < 0)
+    strerr_diefu2sys(111, "listen to ", argv[0]) ;
 
   pathexec_run(argv[1], argv + 1, envp) ;
   strerr_dieexec(111, argv[1]) ;
-- 
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