From 87c5b2118efcee65eeda3f743d081ea9c2b866d9 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Thu, 15 Jan 2015 20:14:44 +0000
Subject:  Move Unix domain utilities and access control utilites, as well as
 the accessrules library, from s6-networking to here

---
 src/conn-tools/s6-sudoc.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/conn-tools/s6-sudoc.c

(limited to 'src/conn-tools/s6-sudoc.c')

diff --git a/src/conn-tools/s6-sudoc.c b/src/conn-tools/s6-sudoc.c
new file mode 100644
index 0000000..823d7cb
--- /dev/null
+++ b/src/conn-tools/s6-sudoc.c
@@ -0,0 +1,115 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/wait.h>
+#include <skalibs/uint.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/bytestr.h>
+#include <skalibs/buffer.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/djbunix.h>
+#include <skalibs/tai.h>
+#include <skalibs/env.h>
+#include <skalibs/unix-timed.h>
+#include <skalibs/unixmessage.h>
+#include "s6-sudo.h"
+
+#define USAGE "s6-sudoc [ -e ] [ -t timeoutconn ] [ -T timeoutrun ] [ args... ]"
+#define dieusage() strerr_dieusage(100, USAGE)
+#define dienomem() strerr_diefu1sys(111, "stralloc_catb")
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  char buf6[64] ;
+  buffer b6 = BUFFER_INIT(&buffer_read, 6, buf6, 64) ;
+  unixmessage_sender_t b7 = UNIXMESSAGE_SENDER_INIT(7) ;
+  subgetopt_t l = SUBGETOPT_ZERO ;
+  unsigned int t = 0, T = 0 ;
+  int doenv = 1 ;
+  
+  tain_t deadline = TAIN_INFINITE_RELATIVE ;
+  PROG = "s6-sudoc" ;
+  for (;;)
+  {
+    register int opt = subgetopt_r(argc, argv, "et:T:", &l) ;
+    if (opt < 0) break ;
+    switch (opt)
+    {
+      case 'e' : doenv = 0 ; break ;
+      case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
+      case 'T' : if (!uint0_scan(l.arg, &T)) dieusage() ; break ;
+      default : dieusage() ;
+    }
+  }
+  argc -= l.ind ; argv += l.ind ;
+  if (t) tain_from_millisecs(&deadline, t) ;
+  if ((ndelay_on(6) < 0) || (ndelay_on(7) < 0))
+    strerr_diefu1sys(111, "make socket non-blocking") ;
+  if (!fd_sanitize() || !fd_ensure_open(2, 1))
+    strerr_diefu1sys(111, "sanitize stdin/stdout/stderr") ;
+
+  tain_now_g() ;
+  tain_add_g(&deadline, &deadline) ;
+  {
+    char tmp[S6_SUDO_BANNERB_LEN] ;
+    if (buffer_timed_get_g(&b6, tmp, S6_SUDO_BANNERB_LEN, &deadline) < S6_SUDO_BANNERB_LEN)
+      strerr_diefu1sys(111, "read banner from s6-sudod") ;
+    if (str_diffn(tmp, S6_SUDO_BANNERB, S6_SUDO_BANNERB_LEN))
+      strerr_dief1x(100, "wrong server banner") ;
+  }
+  {
+    int fds[3] = { 0, 1, 2 } ;
+    char pack[16] ;
+    siovec_t v[4] = {
+      { .s = S6_SUDO_BANNERA, .len = S6_SUDO_BANNERA_LEN },
+      { .s = pack, .len = 16 },
+      { .s = 0, .len = 0 },
+      { .s = 0, .len = 0 } } ;
+    unixmessage_v_t mv = { .v = v, .vlen = 4, .fds = fds, .nfds = 3 } ;
+    stralloc sa = STRALLOC_ZERO ;
+    unsigned int envlen = doenv ? env_len(envp) : 0 ;
+    uint32_pack_big(pack, (uint32)argc) ;
+    uint32_pack_big(pack + 4, (uint32)envlen) ;
+    if (!env_string(&sa, argv, argc)) dienomem() ;
+    v[2].len = sa.len ;
+    uint32_pack_big(pack + 8, (uint32)v[2].len) ;
+    if (doenv)
+    {
+      if (!env_string(&sa, envp, envlen)) dienomem() ;
+      v[3].len = sa.len - v[2].len ;
+    }
+    uint32_pack_big(pack + 12, (uint32)v[3].len) ;
+    v[2].s = sa.s ;
+    v[3].s = sa.s + v[2].len ;
+    if (!unixmessage_putv_and_close(&b7, &mv, (unsigned char const *)"\003"))
+      strerr_diefu1sys(111, "unixmessage_putv") ;
+    stralloc_free(&sa) ;
+  }
+  if (!unixmessage_sender_timed_flush_g(&b7, &deadline))
+    strerr_diefu1sys(111, "send args to server") ;
+  unixmessage_sender_free(&b7) ;
+  {
+    char c ;
+    if (buffer_timed_get_g(&b6, &c, 1, &deadline) < 1)
+      strerr_diefu1sys(111, "get confirmation from server") ;
+    if (c)
+    {
+      errno = c ;
+      strerr_diefu1sys(111, "start privileged program: server answered: ") ;
+    }
+  }
+
+  if (T) tain_from_millisecs(&deadline, T) ; else deadline = tain_infinite_relative ;
+  tain_add_g(&deadline, &deadline) ;
+  {
+    char pack[UINT_PACK] ;
+    if (buffer_timed_get_g(&b6, pack, UINT_PACK, &deadline) < UINT_PACK)
+      strerr_diefu1sys(111, "get exit status from server") ;
+    uint_unpack_big(pack, &t) ;
+  }
+  if (WIFSIGNALED(t)) raise(WTERMSIG(t)) ;
+  return WEXITSTATUS(t) ;
+}
-- 
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